CN109014955B

CN109014955B - Numerical control machine tool

Info

Publication number: CN109014955B
Application number: CN201811138592.8A
Authority: CN
Inventors: 王向军; 王亦民
Original assignee: Gu'an Aerospace Xingbang Machinery Manufacturing Co ltd
Current assignee: Gu'an Aerospace Xingbang Machinery Manufacturing Co ltd
Priority date: 2018-09-28
Filing date: 2018-09-28
Publication date: 2024-01-09
Anticipated expiration: 2038-09-28
Also published as: CN109014955A

Abstract

The invention discloses a numerical control machine tool, which comprises a machine tool body, wherein a machine tool guide rail is arranged on the right side of the top of the machine tool body, the machine tool guide rail comprises a first I-shaped support plate guide rail, a first inverted V-shaped tailstock guide rail, a second I-shaped tailstock guide rail and a second inverted V-shaped support plate guide rail which are sequentially arranged, the first I-shaped support plate guide rail is positioned at the outermost side of the front part of the machine tool body, the second inverted V-shaped support plate guide rail is positioned at the outermost side of the rear part of the machine tool body, a large machine tool support plate is arranged between the first I-shaped support plate guide rail and the second inverted V-shaped support plate guide rail in a straddling manner, a small machine tool support plate is arranged on the large machine tool support plate, a machine tool processing unit is arranged on the rear side of the small machine tool support plate, a machine tool hydraulic tailstock is arranged between the first inverted V-shaped tailstock guide rail and the second I-shaped tailstock guide rail, and a Z-direction transmission lead screw is arranged below the second inverted V-shaped support plate guide rail. The invention realizes the multiple functions of turning, grinding, milling and the like of the workpiece, ensures the machining precision and improves the machining efficiency.

Description

Numerical control machine tool

Technical Field

The invention relates to a machine tool, in particular to a numerical control machine tool capable of simultaneously realizing multiple machining functions such as turning, milling, grinding and the like.

Background

In domestic machining, particularly in machining a spiral workpiece with a relatively large spiral lead such as a spiral screw (screw), a worm wheel and the like by a lathe, a machining process and a machining mode of repeated machining by dividing a cutter are generally adopted, and the following defects cannot be overcome in the machining mode:

(1) The cutter is not only required to bear the pressure of the front surface in the process of machining the spiral groove, but also required to bear great lateral force, and the turning cutter is extremely easy to break off and damage, so that the cutter feeding amount is generally very small, and the cutter can be finished only by repeated machining for many times.

(2) In order to reduce the lateral stress of the cutter during the machining process, the workpiece can only rotate at a low speed, so that the machining efficiency is very low.

(3) The machine tool is easy to cause serious abrasion in a local area of the machine tool, so that the machine tool is scrapped in advance.

(4) The nature of machining a helical workpiece using a common lathe is similar to that of planing, so machining accuracy and finish are generally poor.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides a numerical control machine tool, which changes a machining means by adding a power head so as to improve the machining mode and the machining process, and can provide a multifunctional high-efficiency numerical control machine tool for a user, so that the aim of realizing that one machine tool can finish machining of multiple working procedures, simultaneously solving the old problems of cutter breakage and inefficiency of a spiral workpiece machined by the machine tool, avoiding repeated clamping and repeated alignment of the workpiece, improving the machining efficiency and achieving the aim of improving efficiency and increasing yield is fulfilled.

In order to achieve the above purpose, the invention adopts the following technical scheme: a numerical control machine tool, characterized in that: the machine tool comprises a machine tool body, a large machine tool supporting plate and a hydraulic machine tool tail seat, wherein a machine tool spindle box is arranged at the left end part of the machine tool body, a machine tool numerical control operation table is arranged at the front side of the machine tool body, a machine tool guide rail is arranged at the top of the machine tool body and positioned at the right side of the machine tool spindle box, the machine tool guide rail comprises a first inverted V-shaped supporting plate guide rail, a first inverted V-shaped tail seat guide rail, a second inverted V-shaped tail seat guide rail and a second inverted V-shaped supporting plate guide rail which are horizontally arranged along the length direction of the machine tool body, the first inverted V-shaped supporting plate guide rail is positioned at the outermost front part of the machine tool body, the second inverted V-shaped supporting plate guide rail is positioned at the outermost side of the rear part of the machine tool body, the first inverted V-shaped tail seat guide rail and the second inverted V-shaped tail seat guide rail are both positioned between the first inverted V-shaped supporting plate guide rail and the second inverted V-shaped supporting plate guide rail, the first inverted V-shaped tail seat guide rail is parallel to and adjacent to the first inverted V-shaped supporting plate guide rail, the machine tool guide rail is arranged between the first inverted V-shaped supporting plate guide rail and the second inverted V-shaped supporting plate guide rail is arranged along the first inverted V-shaped supporting plate guide rail, and the machine tool head guide rail is arranged at the two sides of the machine tool body, and the machine tool body is arranged at the front side of the machine tool body and the small side of the machine tool supporting plate is arranged along the inverted V-shaped supporting plate; the machine tool hydraulic tailstock is straddled between the first inverted V-shaped tailstock guide rail and the second linear tailstock guide rail and can slide along the first inverted V-shaped tailstock guide rail and the second linear tailstock guide rail, and a tailstock locking mechanism and a tailstock locking pressing plate are arranged on the machine tool hydraulic tailstock; the rear side of the machine tool body and below the second inverted V-shaped support plate guide rail are provided with Z-direction transmission lead screws, and the Z-direction transmission lead screws are parallel to the second inverted V-shaped support plate guide rail.

The numerical control machine tool is characterized in that: the machine tool machining unit comprises a power head support, a power head cutter disc and a hydraulic drive motor, wherein the power head, the power head cutter disc and the hydraulic drive motor are all located on the front side of the power head support, the hydraulic drive motor is arranged on the right side of the power head, the power head cutter disc is arranged on the left side of the power head, the power head is installed on the power head support through a connecting plate and can be adjusted in height on the power head support, and the power head support is arranged on the rear side of a small machine tool supporting plate.

The numerical control machine tool is characterized in that: the power head support comprises a frame support body, a rotary adjusting screw, a rotary screw support and a rotary adjusting rod nut, wherein the frame support body consists of a support front plate, a support bottom plate, a support top plate, a support rear plate and support side plates which are connected with each other, the number of the support side plates is two, the two support side plates are respectively positioned at the left side and the right side, mounting process holes are formed in the support rear plate and the support side plates, an adjusting screw mounting hole is formed in the middle of the support top plate, four groups of arc power head locking through holes taking the rotary center as the center of a circle are formed in the support front plate at intervals, a first group of arc power head locking through holes, a second group of arc power head locking through holes, a third group of arc power head locking through holes and a fourth group of arc power head locking through holes are sequentially formed in the support front plate from left to right, arc power head locking through holes of the first group and the second group of arc power head locking through holes are respectively formed in the support front plate, arc power head locking through holes of the third group and arc power head locking through holes of the fourth group arc power head locking through holes are respectively formed in the arc chute which takes the rotary center as the center of a circle, and arc power head locking through holes of the third group arc power head locking through holes are arranged on the arc support front plate and arc-shaped through holes of the arc rotating plate are arranged between the arc power head locking through holes of the arc shafts; the rotary screw support is arranged at the top of the support top plate and is positioned at the position of the adjusting screw mounting hole, the lower end of the rotary adjusting screw vertically penetrates through the adjusting screw mounting hole and is positioned in the frame seat, the upper end of the rotary adjusting screw is rotationally connected with the rotary screw support, the rotary adjusting screw is sleeved at the middle part of the rotary adjusting screw and is in threaded fit with the rotary adjusting screw, and the front side of the rotary adjusting screw is provided with a first threaded hole perpendicular to the rotary adjusting screw.

The numerical control machine tool is characterized in that: the connecting plate is a support rotating base plate, the support rotating base plate is arranged at the bottom of the power head, four groups of power head locking bolt holes which take a rotating center as a circle center and are transparent are arranged on the support rotating base plate at intervals, a lever nut connecting step hole is formed in the middle of the support rotating base plate, two groups of first arc-shaped grooves which take the rotating center as the circle center are formed in the rear side of the support rotating base plate, and a rotating plate arc-shaped sliding block is arranged in each first arc-shaped groove; the power head is fixed with the support rotary backing plate and the power head support through the power head fixing bolts which sequentially penetrate through the power head locking bolt holes and the arc power head locking through holes, a first bolt with the end part penetrating through the rod female arc slide through holes is arranged at the rod female connecting step hole, the first bolt is in threaded fit with the first threaded hole and can slide along the rod female arc slide through holes, and the rotary plate arc sliding block is matched with the rotary plate arc sliding groove and can slide along the rotary plate arc sliding groove.

The numerical control machine tool is characterized in that: the power head support comprises a frame support body, a lifting adjusting screw, a lifting screw support and a lifting adjusting rod nut, wherein the frame support body is composed of a support front plate, a support bottom plate, a support top plate, a support rear plate and support side plates which are connected with each other, the number of the support side plates is two, the two support side plates are respectively positioned at the left side and the right side, mounting process holes are respectively formed in the support rear plate and the support side plates, an adjusting screw mounting hole is formed in the middle of the support top plate, two groups of strip-shaped lifting plate locking through holes are respectively formed in the vertical direction of the two sides of the support front plate at intervals, two lifting plate sliding grooves are respectively and vertically formed in the inner sides of the support front plate, which are close to the two groups of strip-shaped lifting plate locking through holes, lifting plate sliding groove key bars are arranged in the lifting plate sliding grooves, and strip-shaped lifting rod nut sliding holes are vertically arranged between the two lifting plate sliding groove key bars; the lifting screw support is arranged at the top of the support top plate and is positioned at the position of the adjusting screw mounting hole, the lower end of the lifting adjusting screw vertically penetrates through the adjusting screw mounting hole and is positioned in the frame seat, the upper end of the lifting adjusting screw is rotationally connected with the lifting screw support, the lifting adjusting screw is sleeved at the middle part of the lifting adjusting screw and is in threaded fit with the lifting adjusting screw, and the front side of the lifting adjusting screw is provided with a second threaded hole perpendicular to the lifting adjusting screw.

The numerical control machine tool is characterized in that: the connecting plate comprises a lifting adjusting connecting plate and a supporting seat lifting base plate, wherein the supporting seat lifting base plate is arranged at the bottom of the power head, the lifting adjusting connecting plate is positioned between the supporting seat lifting base plate and a supporting seat front plate, long arc-shaped power head fixing through holes taking a rotation center as a circle center and three groups of first power head fixing threaded holes distributed in an arc shape are formed in the lifting adjusting connecting plate at intervals from left to right, arc-shaped rotating plate arc-shaped sliding grooves taking the rotation center as the circle center are formed in two sides of the lifting adjusting connecting plate, lifting plate locking threaded holes are vertically formed in two sides of the lifting adjusting connecting plate, lifting rod female step holes are formed in the middle lower portion of the lifting adjusting connecting plate, and two lifting plate straight sliding grooves are vertically formed in the rear side of the supporting seat lifting base plate and in the inner side of the lifting plate locking threaded holes;

the left part of the support lifting base plate is provided with a second power head fixing threaded hole which is arranged in an arc shape by taking the rotation center as the circle center, the middle part and the rear part of the support lifting base plate are both provided with power head fixing through holes which are arranged in an arc shape by taking the rotation center as the circle center, the rear side of the support lifting base plate is provided with a second arc-shaped groove which is arranged in an arc shape by taking the rotation center as the circle center, and the second arc-shaped groove is internally provided with a rotary plate arc-shaped key bar;

The power head and the support lifting base plate are fixed on the lifting adjustment connecting plate through a first power head fixing bolt and a second power head fixing bolt, the first power head fixing bolt passes through the power head fixing through hole and is in threaded connection with the first power head fixing threaded hole, the second power head fixing bolt passes through the long arc power head fixing through hole and is in threaded connection with the second power head fixing threaded hole, the lifting adjustment connecting plate is fixed with the frame base body through the lifting connecting plate fixing bolt, lifting connection board fixing bolt passes behind the long bar lifter plate locking through-hole with lifter plate locking screw hole threaded connection, the female step hole department of lifter is provided with the second bolt that the tip passed the female slide hole of long bar lifter, the second bolt with the female slide hole of rectangular shape lifter, just can slide along the female slide hole of long bar lifter, lifter plate spout keybar and the straight spout sliding fit of lifter plate, rotor plate arc keybar and the arc spout sliding fit of arc rotor plate.

The numerical control machine tool is characterized in that: the power head shaft head is a taper shaft head with steps, a cutter head taper shaft hole matched with the taper shaft head with steps is formed in the cutter head of the power head, and the cutter head of the power head is a disc-shaped cutter head or a slender rod-shaped cutter head of the power head.

The numerical control machine tool is characterized in that: the large-support-plate rolling mechanism comprises a rolling mechanism support, a needle bearing, a rolling mechanism shaft pin, a disc spring washer cap and a rolling mechanism adjusting bolt, wherein the disc spring washer cap is arranged at the outer end of the rolling mechanism support, the disc spring is formed by stacking a plurality of disc springs relatively, the disc spring is sleeved on an outer end cylinder of the rolling mechanism support, the needle bearing and the rolling mechanism shaft pin are both arranged at the inner end of the rolling mechanism support, the needle bearing is fixed with the rolling mechanism support through the rolling mechanism shaft pin, the rolling mechanism adjusting bolt is positioned at the outer side of the disc spring washer cap, the rolling mechanism adjusting bolt is in threaded connection with a large support plate of a machine tool, and the needle bearing is in rolling contact with a machine tool guide rail.

The numerical control machine tool is characterized in that: the tail seat locking pressing plate is arranged at the lower part of the tail seat locking mechanism, the tail seat locking mechanism comprises a T-shaped locking bolt, a locking cylinder body, a locking cylinder piston, a fastening nut and a limiting bushing, the locking cylinder piston and the limiting bushing are arranged in the locking cylinder body, the limiting bushing is positioned below the locking cylinder piston, the upper part of the T-shaped locking bolt sequentially penetrates through the bottom of the locking cylinder body and the middle part of the locking cylinder piston, the fastening nut is arranged at the upper part of the T-shaped locking bolt and connects the locking cylinder piston with the locking cylinder body, a locking cylinder oil cavity is formed among the locking cylinder body, the locking cylinder piston, the limiting bushing and the T-shaped locking bolt, and an oil inlet and oil return interface communicated with the locking cylinder oil cavity is arranged at the center of the upper part of the T-shaped locking bolt; the locking cylinder body is arranged in a mounting hole formed in the tailstock locking mechanism, and the lower part of the T-shaped locking bolt is matched with the step of the tailstock locking pressing plate.

The numerical control machine tool is characterized in that: the machine tool hydraulic tailstock comprises a tailstock base plate, a tailstock body and a tailstock hydraulic cylinder, the tailstock body is arranged on the upper portion of the tailstock base plate, the tailstock hydraulic cylinder is arranged on the upper portion of the tailstock body, a tailstock center is arranged at one end of the tailstock hydraulic cylinder, which is close to the main shaft box of the machine tool, and the tailstock base plate straddles between a first inverted V-shaped tailstock guide rail and a second linear tailstock guide rail;

the tail seat hydraulic cylinder comprises a hydraulic cylinder cavity, a tail seat shaft sleeve, a disassembly ejector rod, a process seal sleeve, a tail seat cylinder piston, a shaft sleeve lock nut and a tail seat cylinder end cover, wherein the tail seat shaft sleeve is axially arranged in the hydraulic cylinder cavity, the disassembly ejector rod is axially arranged at the right center of the tail seat shaft sleeve, the tail seat shaft sleeve is in sliding fit with the disassembly ejector rod, the process seal sleeve and the tail seat cylinder piston are both arranged at the outer side of the tail seat shaft sleeve, the shaft sleeve lock nut is arranged at the right end of the tail seat shaft sleeve and fixes the tail seat shaft sleeve and the tail seat cylinder piston through the shaft sleeve lock nut, and the process seal sleeve, the tail seat cylinder piston and the shaft sleeve lock nut are all positioned in the hydraulic cylinder cavity; the tail seat oil cylinder end cover is arranged at the tail part of the hydraulic oil cylinder cavity and is fixedly connected with the hydraulic oil cylinder cavity through a cylinder cover connecting bolt, the right end of the disassembly ejector rod penetrates out of the tail seat oil cylinder end cover, the right end of the disassembly ejector rod is provided with an ejector rod locking nut, the disassembly ejector rod is fixed with the tail seat oil cylinder end cover through the ejector rod locking nut, and the hydraulic oil cylinder cavity is arranged at the upper part of the tail seat body; the hydraulic cylinder comprises a tailstock cylinder end cover, a hydraulic cylinder cavity, a tailstock cylinder piston, a shaft sleeve locking nut, a tailstock shaft sleeve and a disassembly ejector rod, wherein a jacking acting oil cavity is formed among the hydraulic cylinder cavity, the tailstock shaft sleeve, a process seal sleeve and the tailstock cylinder piston; the tail seat is characterized in that a shaft sleeve positioning groove is formed in the lower left side of the tail seat shaft sleeve, a positioning block mounting hole is formed in the lower left end of the hydraulic cylinder cavity, a shaft sleeve positioning block is arranged in the positioning block mounting hole and can slide relative to the shaft sleeve positioning groove, and the tail seat center is axially fixed at the left center of the tail seat shaft sleeve.

Compared with the prior art, the invention has the following advantages:

1. according to the invention, after the machine tool processing unit is added on the small supporting plate of the machine tool, the low-speed planing mode of the cutter when the common lathe processes the spiral workpiece is changed into the high-speed milling mode of the rotary cutter disc, so that the machining efficiency is high, and the machining precision and the workpiece smoothness are higher.

2. The invention adds the machine tool processing unit on the rear side of the small supporting plate of the machine tool, does not influence the function of the original tool rest of the machine tool, and the power head not only can be provided with a cutter head, but also can be provided with accessories such as a grinding wheel, and the like, thereby increasing the functions of the machine tool, realizing the processing of workpieces with one machine for completing multiple working procedures, and realizing the multi-working procedure and multi-working-station mechanical processing of turning, milling, grinding and drilling on the same machine tool, expanding the functions of the machine tool, and improving the performance of the machine tool.

3. The invention rearranges the machine tool guide rail and the Z-direction transmission screw rod, which is just opposite to the common lathe, has the advantages that the physical gravity center formed by the additionally arranged machine tool processing unit and the machine tool supporting plate is just very close to the guide rail of the machine tool rail and the Z-direction transmission screw rod, thereby greatly reducing the harmful torque and friction resistance generated by displacement deformation when the Z-direction transmission screw rod moves, and ensuring that the transmission of the Z-direction transmission screw rod is more stable and efficient.

4. According to the invention, by adding the large supporting plate rolling mechanisms horizontally arranged around the large supporting plate of the machine tool, the movement mode of the large supporting plate of the machine tool and the machine tool guide rail on the vertical contact surface is changed from the original sliding mode to the current rolling mode, and by adjusting the bolts of the rolling mechanisms around, the pressure of the bolts on the rolling mechanism can be changed, namely the contact state of the large supporting plate of the machine tool and the machine tool guide rail on the vertical contact surface is changed, the large supporting plate of the machine tool on the machine tool guide rail is in an ideal floating state, the friction force at the moment is minimum, the movement is most flexible, the abrasion of the machine tool can be reduced, and the service life of the machine tool is prolonged.

5. The invention adopts the first one-shaped supporting plate guide rail of the machine tool guide rail to be arranged at the forefront side, the second inverted V-shaped supporting plate guide rail to be arranged at the rearmost side, and the Z-direction transmission lead screw to be horizontally arranged at the rearmost side, thereby overcoming the phenomenon that the gravity center of a large supporting plate is seriously deviated after a machine tool processing unit is additionally arranged on a general machine tool, and arranging a rolling mechanism horizontally on the large supporting plate of the machine tool, reducing the resistance of the Z-direction transmission lead screw by times, making up the defect of the design structure of the existing machine tool, realizing that a machine tool can simultaneously arrange a tool rest and the machine tool processing unit for processing and linkage, realizing one machine for processing such as workpiece turning, grinding, milling and the like, ensuring the processing precision, improving the processing efficiency and saving the resources.

6. The small supporting plate surface of the machine tool adopts the structure form of the T-shaped groove, so that accessories such as a tool rest, a machine tool processing unit and the like can be conveniently installed, meanwhile, an output shaft head of the power head adopts a taper form with steps, a cutter in the form of a cutter head can be conveniently installed, and a blade in the form of a long cutter bar can also be installed, so that flexible processing of workpieces with external screw and internal screw of a shaft is realized.

The invention is described in further detail below with reference to the drawings and examples.

Drawings

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural view of fig. 1 after being rotated by a certain angle.

Fig. 3 is a cross-sectional view A-A of fig. 1.

Fig. 4 is a schematic view of the structure of fig. 3 with the tool post, tool headstock and tool processing unit removed.

Fig. 5 is a schematic diagram showing the positional relationship among the machine tool guide rail, the machine tool large pallet, the machine tool small pallet and the large pallet rolling mechanism in embodiment 1 of the present invention.

Fig. 6 is a schematic view showing the structure of a machine tool processing unit in embodiment 1 of the present invention.

Fig. 7 is a schematic view of the structure of fig. 6 after being rotated by a certain angle.

Fig. 8 is a schematic view of the structure of a power head support in embodiment 1 of the present invention.

Fig. 9 is a front view of a holder rotating pad in embodiment 1 of the present invention.

Fig. 10 is a rear view of the support rotating pad in embodiment 1 of the present invention.

Fig. 11 is an exploded view of the power head and the hydraulic drive motor when the disc-shaped power head cutterhead is used in embodiment 1 of the present invention.

Fig. 12 is an exploded view of the power head and the hydraulic drive motor when the power head cutterhead of embodiment 1 of the present invention is an elongated rod-shaped power head cutterhead.

Fig. 13 is a schematic structural view of a large pallet rolling mechanism in embodiment 1 of the present invention.

Fig. 14 is a schematic structural view of a tailstock locking mechanism in embodiment 1 of the present invention.

Fig. 15 is a schematic structural view of a hydraulic tailstock of a machine tool in embodiment 1 of the present invention.

Fig. 16 is a schematic diagram of the positional relationship among the tailstock hydraulic cylinder, the tailstock body and the tailstock center in embodiment 1 of the present invention.

Fig. 17 is a schematic structural view of embodiment 2 of the present invention.

Fig. 18 is a schematic view showing the structure of a machine tool processing unit in embodiment 2 of the present invention.

Fig. 19 is a schematic view of the structure of fig. 18 rotated by a certain angle.

Fig. 20 is a schematic view showing the structure of a power head support in embodiment 2 of the present invention.

Fig. 21 is a front view of the elevation adjustment connecting plate in embodiment 2 of the present invention.

Fig. 22 is a rear view of the elevation adjustment connecting plate in embodiment 2 of the present invention.

Fig. 23 is a front view of the support lift pad in embodiment 2 of the present invention.

Fig. 24 is a rear view of the support lift pad in embodiment 2 of the present invention.

Reference numerals illustrate:

1-a main spindle box of a machine tool; 2-a machine tool body; 3-a large supporting plate rolling mechanism;

3-1-a rolling mechanism bracket; 3-2-needle bearings; 3-rolling mechanism shaft pin;

3-4-disc springs; 3-5-disc spring mattress caps; 4-a large supporting plate of the machine tool;

5-small supporting plates of the machine tool; 5-1-T-shaped groove; 6, a numerical control operation table of the machine tool;

7-a machine tool guide rail; 8, a tailstock locking pressing plate; 9-Z direction transmission screw rod;

10-a tailstock locking mechanism; 10-1-T type locking bolt; 10-2, locking the cylinder body of the oil cylinder;

10-3-locking the cylinder piston; 10-4-tightening nuts; 10-5 of a limiting bushing;

10-6-locking an oil cylinder oil cavity; 10-7-an oil inlet and return interface; 11-a hydraulic tailstock of the machine tool;

11-1-tailstock hydraulic cylinder; 11-11-a hydraulic cylinder cavity; 11-12 parts of tailstock shaft sleeve;

11-13-disassembling the ejector rod; 11-14-process seal cartridges; 11-15 parts of tailstock oil cylinder piston;

11-16-sleeve lock nut; 11-17-tailstock cylinder end cover; 11-18-cylinder cover connecting bolts;

11-19-ejector pin lock nuts; 11-110-propping up the acting oil cavity;

11-111-withdrawing the acting oil cavity; 11-112-jacking the acting oil inlet;

11-113-withdrawing the working oil inlet; 11-114-shaft sleeve positioning grooves;

11-115-positioning block mounting holes; 11-116, a shaft sleeve positioning block; 11-2, a tailstock backing plate;

11-3, a tailstock body; 11-4, a tailstock center; 12-a small supporting plate driving mechanism of a machine tool;

13-a hydraulic drive motor; 14-a power head support; 15-a power head;

16-a power head cutterhead; 16-1-disc-shaped cutterhead of the power head;

16-2, a cutter head of the slender rod-shaped power head; 17-Z direction driving motor;

18-a machine tool head; 19-Z direction screw rod supporting seats; 20-a rolling mechanism adjusting bolt;

21-a second inverted V-shaped pallet rail; 22-rotating the adjusting screw;

23-a first I-shaped pallet guide rail; 24-a first inverted V-shaped tailstock guide rail;

25-a second linear tailstock guide rail; 26-Z direction nut seat; 27-a support rotating backing plate;

28-a support front plate; 29-a rotating screw support; 30-a support side plate;

31-a support back plate; 32-drilling an installation process; 33-a support base plate;

34-a power head fixing bolt; 34-1—a first power head fixing bolt;

34-2-a second power head fixing bolt; 35-rotating the adjusting lever mother;

36—a rotation center; 37-arc chute of rotating plate; 38-a lever female arc slideway through hole;

39-an arc power head locking through hole; 40-locking bolt holes of the power head;

41-a lever female connection step hole; 42-rotating plate arc-shaped slide blocks; 43-lifting adjusting lever mother;

44-lifting screw support; 45-lifting adjusting screw rod; 46, lifting and adjusting the connecting plate;

47-a support lifting backing plate; 48-lifting connecting plate fixing bolts; 49-lifting plate chute key bar;

50-locking through holes of the strip-shaped lifting plates; 51-a strip-shaped lifting rod female slideway hole;

52-a lifting rod female step hole; 53-arc runner of arc rotating plate;

54-a first power head fixing threaded hole; 55-a long arc power head fixing through hole;

56-lifting plate straight sliding groove; 57-a power head fixing through hole; 58-rotating plate arcuate key bars;

59-a stepped taper spindle nose; 60-a cutter taper shaft hole;

61-a second power head fixing threaded hole; 62-lifting plate locking threaded holes;

63-a pedestal roof; 64-adjusting the screw mounting hole; 65-first bolt.

Detailed Description

Example 1

The numerical control machine tool as shown in figures 1 to 5 comprises a machine tool body 2, a machine tool large supporting plate 4 and a machine tool hydraulic tailstock 11, wherein a machine tool spindle box 1 is arranged at the left end part of the machine tool body 2, a machine tool numerical control operation table 6 is arranged at the front side of the machine tool body 2, a machine tool guide rail 7 is arranged at the top of the machine tool body 2 and positioned at the right side of the machine tool spindle box 1, the machine tool guide rail 7 comprises a first I-shaped supporting plate guide rail 23, a first inverted V-shaped tailstock guide rail 24, a second I-shaped tailstock guide rail 25 and a second inverted V-shaped supporting plate guide rail 21 which are horizontally arranged along the length direction of the machine tool body 2, the first I-shaped supporting plate guide rail 23 is positioned at the outermost side of the front part of the machine tool body 2, the second inverted V-shaped supporting plate guide rail 21 is positioned at the outermost side of the rear part of the machine tool body 2, the first inverted V-shaped tail seat guide rail 24 and the second inverted V-shaped tail seat guide rail 25 are both positioned between the first inverted V-shaped support plate guide rail 23 and the second inverted V-shaped support plate guide rail 21, the first inverted V-shaped tail seat guide rail 24 is parallel and adjacent to the first inverted V-shaped support plate guide rail 23, the second inverted V-shaped tail seat guide rail 25 is parallel and adjacent to the second inverted V-shaped support plate guide rail 21, the large machine tool support plate 4 straddles between the first inverted V-shaped support plate guide rail 23 and the second inverted V-shaped support plate guide rail 21 and can slide along the first inverted V-shaped support plate guide rail 23 and the second inverted V-shaped support plate guide rail 21, the front side and the rear side of the large machine tool support plate 4 are horizontally provided with large support plate rolling mechanisms 3, the small machine tool support plate 5 is arranged on the large machine tool support plate 4, the front side of the small machine tool support plate 5 is provided with a machine tool cutter frame 18, and the rear side of the small machine tool support plate 5 is provided with a machine tool processing unit; the machine tool hydraulic tailstock 11 straddles between the first inverted V-shaped tailstock guide rail 24 and the second linear tailstock guide rail 25 and can slide along the first inverted V-shaped tailstock guide rail 24 and the second linear tailstock guide rail 25, and the machine tool hydraulic tailstock 11 is provided with a tailstock locking mechanism 10 and a tailstock locking pressing plate 8; the rear side of the machine tool body 2 and below the second inverted V-shaped support plate guide rail 21 are provided with a Z-direction transmission screw rod 9, and the Z-direction transmission screw rod 9 is parallel to the second inverted V-shaped support plate guide rail 21.

The numerical control machine tool of this embodiment is different from the existing general lathe in that: in this embodiment, the first inverted V-shaped pallet guide rail 23 of the machine tool guide rail 7 is disposed at the outermost front side of the machine tool body 2, the second inverted V-shaped pallet guide rail 21 with the largest guiding effect is disposed at the outermost rear side of the machine tool body 2, meanwhile, the Z-direction transmission screw 9 is disposed at the outermost rear side of the machine tool body 2 and below and adjacent to the second inverted V-shaped pallet guide rail 21, the Z-direction transmission screw 9 and the second inverted V-shaped pallet guide rail 21 are disposed in parallel, and the Z-direction transmission screw 9 is located closest to the physical center of gravity of the second inverted V-shaped pallet guide rail 21 and the machine tool large pallet 4, so that a guarantee is provided for smooth transmission operation of the Z-direction transmission screw 9.

The structural arrangement is opposite to the guide rail design of the common lathe, and the reason for the arrangement is as follows: in order to change the machining mode of the lathe and improve the machining process, a machine tool machining unit is added on the small machine tool supporting plate 5, so that the load of the large machine tool supporting plate 4 is increased; since the center of gravity of the pallet is also shifted rearward as compared with the common lathe, the present invention has the advantage that the second inverted V-shaped pallet rail 21 is provided at a position close to the center of gravity of the pallet, and the second inverted V-shaped pallet rail 21 has the best guidance.

In this embodiment, the Z-direction drive screw 9 is horizontally disposed behind the machine tool body 2 and below the second inverted V-shaped pallet guide rail 21, which is also different from the normal lathe in that the Z-direction drive screw 9 of the normal lathe is disposed in a position directly in front of the machine tool body 2. The advantages of this arrangement are: the Z-direction transmission lead screw 9 is closest to the physical gravity center of the large machine tool supporting plate 4 and the second inverted V-shaped supporting plate guide rail 21 with the guiding function, so that the Z-direction transmission lead screw 9 is most labor-saving and has highest efficiency, and because the Z-direction transmission lead screw 9 is closest to the second inverted V-shaped supporting plate guide rail 21 with the guiding function, when the Z-direction transmission lead screw 9 drives the large machine tool supporting plate 4 to move, the resistance formed by the deflection generated by the fit clearance between the vertical side surface of the large machine tool supporting plate 4 and the vertical side surface of the machine tool guide rail 7 is minimum, and the scratch and abrasion between the vertical side surface of the large machine tool supporting plate 4 and the vertical side surface of the machine tool guide rail 7 is also minimum.

As shown in fig. 6 and 7, the machine tool processing unit includes a power head support 14, a power head 15, a power head cutter 16 and a hydraulic drive motor 13, wherein the power head 15, the power head cutter 16 and the hydraulic drive motor 13 are all located at the front side of the power head support 14, the hydraulic drive motor 13 is arranged at the right side of the power head 15, the power head cutter 16 is arranged at the left side of the power head 15, the power head 15 is installed on the power head support 14 through a connecting plate and can adjust the height on the power head support 14, and the power head support 14 is arranged at the rear side of the small machine tool supporting plate 5.

As shown in fig. 6 to 8, the power head support 14 includes a frame base, a rotation adjusting screw 22, a rotation screw support 29 and a rotation adjusting lever nut 35, the frame base is composed of a support front plate 28, a support bottom plate 33, a support top plate 63, a support rear plate 31 and support side plates 30 which are connected, the number of the support side plates 30 is two, the two support side plates 30 are respectively located at the left and right sides, mounting process holes 32 are respectively formed in the support rear plate 31 and the support side plates 30, an adjusting screw mounting hole 64 is formed in the middle of the support top plate 63, four groups of arc power head locking through holes 39 taking a rotation center 36 as a circle center are formed in the support front plate 28 at intervals, the four groups of arc power head locking through holes 39 are sequentially a first group of arc power head locking through holes, a second group of arc power head locking through holes, a third group of arc power head locking through holes and a fourth group of arc power head locking through holes, the support front plate 28 is located between the first group of arc power head locking through holes and the second group of arc power head locking through holes, the fourth group of arc power head locking through holes are formed between the arc power head locking through holes of the fourth group 36 and the arc chute 36 which are located between the arc power head locking through holes of the rotation center 36 and the rotation adjusting screw 36 which are arranged between the arc power head locking through holes of the rotation plate 36 and the rotation adjusting screw; the rotary screw support 29 is installed at the top of the support top plate 63 and is located at the adjusting screw mounting hole 64, the lower end of the rotary adjusting screw 22 vertically penetrates through the adjusting screw mounting hole 64 and is located in the frame seat, the upper end of the rotary adjusting screw 22 is rotationally connected with the rotary screw support 29, the rotary adjusting screw nut 35 is sleeved at the middle of the rotary adjusting screw 22 and is in threaded fit with the rotary adjusting screw nut 35, and a first threaded hole perpendicular to the rotary adjusting screw 22 is formed in the front side of the rotary adjusting screw nut 35.

As shown in fig. 9 and 10, the connecting plate is a support rotating base plate 27, the support rotating base plate 27 is arranged at the bottom of the power head 15, four groups of power head locking bolt holes 40 which take a rotating center 36 as a circle center and are transparent are arranged on the support rotating base plate 27 at intervals, a lever female connecting step hole 41 is arranged in the middle of the support rotating base plate 27, two groups of first arc-shaped grooves which take the rotating center 36 as the circle center are arranged at the rear side of the support rotating base plate 27, and a rotating plate arc-shaped sliding block 42 is arranged in the first arc-shaped grooves; the power head 15 is fixed with the support rotating base plate 27 and the power head support 14 through the power head fixing bolts 34 sequentially penetrating through the power head locking bolt holes 40 and the arc power head locking through holes 39, the first bolts 65 with the ends penetrating through the lever female arc-shaped slide through holes 38 are arranged at the lever female connecting step holes 41, the first bolts 65 are in threaded fit with the first threaded holes and can slide along the lever female arc-shaped slide through holes 38, and the rotating plate arc-shaped slide blocks 42 are matched with the rotating plate arc-shaped slide grooves 37 and can slide along the rotating plate arc-shaped slide grooves 37.

In this embodiment, the power head 15 connects the power head bottom plate with the front side of the support rotating backing plate 27 through the power head fixing bolt 34, the rear side of the support rotating backing plate 27 is provided with a rotating plate arc-shaped sliding block 42, the rotating plate arc-shaped sliding block 42 is matched with a rotating plate arc-shaped chute 37 arranged on the support front plate 28 of the power head support 14, under the action of the rotating adjusting screw 22, the center (namely, the rotating center 36) of the cutterhead is used as a circle center to swing and rotate along the rotating plate arc-shaped chute 37 as a track, so that the change of the rotating plane of the cutterhead is realized, and the processing of different spiral angles of different workpieces is adapted; after the adjustment is completed, the power head 15 is locked and fixed on the small supporting plate 5 of the machine tool through the power head fixing bolts 34, and the accurate machining of the workpiece is realized under the control of the numerical control operation table 6 of the machine tool. The center height of the cutter is fixed, and the structure of the power head support 14 is small and simple, so that the cutter is suitable for processing large-batch workpieces without changing the center height of the cutter.

In this embodiment, the shaft head of the power head 15 is a stepped taper shaft head 59, a cutter taper shaft hole 60 matched with the stepped taper shaft head 59 is provided on the power head cutter 16, and the power head cutter 16 is a disc-shaped power head cutter 16-1, as shown in fig. 11; or the head cutterhead 16 may be an elongated rod-like head cutterhead 16-2, as shown in fig. 12.

The hydraulic driving motor 13 of the machine tool processing unit can be replaced by a variable frequency motor to realize driving, and the hydraulic motor or the variable frequency motor can be displaced to the support back plate 31 of the power head support 14, and a belt pulley is connected with the power head 15 instead to indirectly drive. In this embodiment, by changing the structural form of the cutterhead, external milling of external threads of a workpiece can be realized by using the disc-shaped cutterhead 16-1 of the power head, and also the external milling of internal threads of the inner diameter of the workpiece can be realized by replacing the disc-shaped cutterhead 16-2 of the slender rod-shaped power head, that is, the same power head can be used as an external rotary wind milling product and an internal rotary wind milling product, so that the purposes of multiple functions, reduction of equipment investment for users and saving are realized.

As shown in fig. 13, the large supporting plate rolling mechanism 3 comprises a rolling mechanism support 3-1, a needle bearing 3-2, a rolling mechanism shaft pin 3-3, a disc spring 3-4, a disc spring pad cap 3-5 and a rolling mechanism adjusting bolt 20, wherein the disc spring pad cap 3-5 is arranged at the outer end of the rolling mechanism support 3-1, the disc spring 3-4 is formed by relatively stacking a plurality of disc spring plates, the disc spring 3-4 is sleeved on an outer end cylinder of the rolling mechanism support 3-1, the needle bearing 3-2 and the rolling mechanism shaft pin 3-3 are arranged at the inner end of the rolling mechanism support 3-1, the needle bearing 3-2 is fixed with the rolling mechanism support 3-1 through the rolling mechanism shaft pin 3-3, the rolling mechanism adjusting bolt 20 is positioned at the outer side of the disc spring pad cap 3-5, the rolling mechanism adjusting bolt 20 is in threaded connection with the large supporting plate 4 of the machine tool, and the needle bearing 3-2 is in rolling contact with the machine tool guide rail 7. By adjusting the tightness degree of the rolling mechanism adjusting bolt 20, the contact condition of the machine tool large supporting plate 4 and the machine tool guide rail 7 in the vertical direction can be changed, so that the machine tool large supporting plate 4 and the machine tool guide rail 7 are in a floating fit state.

Two large supporting plate rolling mechanisms 3 are respectively and horizontally arranged at right angles of the front side and the rear side of the large supporting plate 4, the large supporting plate rolling mechanisms 3 enable the vertical side face of the large supporting plate 4 of the machine tool to be always in a floating state with the vertical side face of the guide rail 7 of the machine tool under the action of internal disc springs 3-4, the vertical side face of the large supporting plate 4 of the machine tool and the vertical side face of the guide rail 7 of the machine tool are changed into rolling contact between the inner bearing face of the rolling mechanism and the vertical face of the guide rail of the machine tool from original direct sliding contact, when the large supporting plate 4 of the machine tool needs to move under the drive of a Z-direction transmission screw 9, friction force is very small, the flexibility of transverse movement of the large supporting plate 4 of the machine tool is improved, machining precision is improved, and abrasion is reduced.

As shown in fig. 14, the tailstock locking pressure plate 8 is disposed at the lower part of the tailstock locking mechanism 10, the tailstock locking mechanism 10 includes a T-shaped locking bolt 10-1, a locking cylinder body 10-2, a locking cylinder piston 10-3, a fastening nut 10-4 and a limit bushing 10-5, the locking cylinder piston 10-3 and the limit bushing 10-5 are disposed in the locking cylinder body 10-2, the limit bushing 10-5 is disposed below the locking cylinder piston 10-3, the upper part of the T-shaped locking bolt 10-1 sequentially passes through the bottom of the locking cylinder body 10-2 and the middle part of the locking cylinder piston 10-3, the fastening nut 10-4 is disposed at the upper part of the T-shaped locking bolt 10-1 and connects the locking cylinder piston 10-3 and the locking cylinder body 10-2, a locking cylinder oil return cavity 10-6 is formed among the locking cylinder body 10-2, the locking cylinder piston 10-3, the limit bushing 10-5 and the T-shaped locking cylinder body 10-1, and the upper center of the T-shaped locking bolt 10-1 is provided with an oil inlet port 10-6 communicating with the locking cylinder oil return cavity 10-6; the locking cylinder body 10-2 is arranged in a mounting hole formed in the tailstock locking mechanism 10, and the lower part of the T-shaped locking bolt 10-1 is matched with the step of the tailstock locking pressing plate 8.

As shown in fig. 15, the hydraulic tailstock 11 of the machine tool comprises a tailstock base 11-2, a tailstock body 11-3 and a tailstock hydraulic cylinder 11-1, the tailstock body 11-3 is mounted on the upper portion of the tailstock base 11-2, the tailstock hydraulic cylinder 11-1 is mounted on the upper portion of the tailstock body 11-3, a tailstock center 11-4 is arranged at one end of the tailstock hydraulic cylinder 11-1, which is close to the spindle box 1 of the machine tool, and the tailstock base 11-2 straddles between a first inverted V-shaped tailstock guide 24 and a second linear tailstock guide 25.

As shown in fig. 16, the tailstock hydraulic cylinder 11-1 comprises a hydraulic cylinder cavity 11-11, a tailstock shaft sleeve 11-12, a disassembly ejector rod 11-13, a process seal sleeve 11-14, a tailstock cylinder piston 11-15, a shaft sleeve lock nut 11-16 and a tailstock cylinder end cover 11-17, wherein the tailstock shaft sleeve 11-12 is axially arranged in the hydraulic cylinder cavity 11-11, the disassembly ejector rod 11-13 is axially arranged at the right center of the tailstock shaft sleeve 11-12, the tailstock shaft sleeve 11-12 is in sliding fit with the disassembly ejector rod 11-13, the process seal sleeve 11-14 and the tailstock cylinder piston 11-15 are both arranged at the outer side of the tailstock shaft sleeve 11-12, the shaft sleeve lock nut 11-16 is arranged at the right end of the tailstock shaft sleeve 11-12 and fixes the tailstock shaft sleeve 11-12 and the tailstock cylinder piston 11-15 through the shaft sleeve lock nut 11-16, and the process seal sleeve 11-14, the tailstock cylinder piston 11-15 and the shaft sleeve lock nut 11-16 are all positioned in the hydraulic cylinder cavity 11-11; the tail seat oil cylinder end cover 11-17 is arranged at the tail part of the hydraulic oil cylinder cavity 11-11 and is fixedly connected with the hydraulic oil cylinder cavity 11-11 through a cylinder cover connecting bolt 11-18, the right end of the disassembly ejector rod 11-13 penetrates out of the tail seat oil cylinder end cover 11-17, the right end of the disassembly ejector rod 11-13 is provided with an ejector rod locking nut 11-19 and fixes the disassembly ejector rod 11-13 with the tail seat oil cylinder end cover 11-17 through the ejector rod locking nut 11-19, and the hydraulic oil cylinder cavity 11-11 is arranged at the upper part of the tail seat body 11-3; the hydraulic cylinder comprises a tailstock cylinder end cover 11-17, a hydraulic cylinder cavity 11-11, a tailstock cylinder piston 11-15, a shaft sleeve lock nut 11-16, a tailstock shaft sleeve 11-12 and a disassembly ejector rod 11-13, wherein a jacking acting oil cavity 11-110 is formed among the hydraulic cylinder cavity 11-11, the tailstock shaft sleeve 11-12, a process seal sleeve 11-14 and the tailstock cylinder piston 11-15, a retreating acting oil cavity 11-111 is formed among the hydraulic cylinder cavity 11-11, the tailstock shaft sleeve 11-12, the process seal sleeve 11-14 and the tailstock cylinder piston 11-15, a jacking acting oil inlet 11-112 communicated with the jacking acting oil cavity 11-110 is arranged on the tailstock cylinder end cover 11-17, and a retreating acting oil inlet 11-113 communicated with the retreating acting oil cavity 11-111 is arranged on the hydraulic cylinder cavity 11-11; the tail seat is characterized in that a shaft sleeve positioning groove 11-114 is formed in the lower left side of the tail seat shaft sleeve 11-12, a positioning block mounting hole 11-115 is formed in the lower left end of the hydraulic cylinder cavity 11-11, a shaft sleeve positioning block 11-116 is arranged in the positioning block mounting hole 11-115, the shaft sleeve positioning block 11-116 can slide relative to the shaft sleeve positioning groove 11-114, and the tail seat center 11-4 is axially fixed in the left center of the tail seat shaft sleeve 11-12.

The tailstock shaft sleeve 11-12, the tailstock oil cylinder piston 11-15 and the shaft sleeve lock nut 11-16 can move left or right in the horizontal direction in the hydraulic oil cylinder cavity 11-11 under the action of hydraulic oil; the shaft sleeve positioning block 11-116 can slide in the shaft sleeve positioning groove 11-114 and position the tailstock shaft sleeve 11-12 in the circumferential direction to prevent the radial rotation of the tailstock shaft sleeve 11-12, and a Morse taper hole is arranged on the left side of the tailstock shaft sleeve 11-12 and combined with the tailstock center 11-4. When hydraulic oil enters from the jacking acting oil inlet 11-112, the hydraulic oil pushes the tailstock oil cylinder piston 11-15, the shaft sleeve locking nut 11-16 and the tailstock shaft sleeve 11-12 to move leftwards, and simultaneously drives the tailstock center 11-4 to move leftwards so as to jack a workpiece; when hydraulic oil enters the retreating power oil cavity 11-111 from the retreating power oil inlet 11-113, the hydraulic oil pushes the tailstock oil cylinder piston 11-15, the shaft sleeve locking nut 11-16 and the tailstock shaft sleeve 11-12 to move rightwards, and drives the tailstock center 11-4 to move rightwards so as to realize loosening; because the disassembly ejector rod 11-13 is fixed and the length is unchanged, when the tail seat is continuously retracted to the bottom, the tail seat center 11-4 is ejected by the disassembly ejector rod 11-13, and other centers or tail seat drills can be replaced for other processing.

As shown in fig. 1, 2 and 4, a T-shaped groove 5-1 is formed in the top of the small machine tool supporting plate 5 along the length direction, and a small machine tool supporting plate driving mechanism 12 capable of driving the small machine tool supporting plate 5 to slide back and forth along the large machine tool supporting plate 4 is arranged on the large machine tool supporting plate 4; the two ends of the Z-direction transmission screw rod 9 are respectively provided with a Z-direction driving motor 17 and a Z-direction screw rod supporting seat 19, the output end of the Z-direction driving motor 17 is connected with one end of the Z-direction transmission screw rod 9, the other end of the Z-direction transmission screw rod 9 is rotationally connected with the Z-direction screw rod supporting seat 19, the Z-direction transmission screw rod 9 is provided with a Z-direction screw rod seat 26 in threaded fit with the Z-direction transmission screw rod 9, the Z-direction screw rod seat 26 is fixed with the large supporting plate 4 of the machine tool, and the Z-direction driving motor 17 and the Z-direction screw rod supporting seat 19 are both arranged on the machine tool body 2.

The machine tool small supporting plate driving mechanism 12 is of a screw nut transmission structure, namely the machine tool small supporting plate driving mechanism is the same as a Z-direction transmission screw transmission structure, and the machine tool large supporting plate 4 drives the machine tool small supporting plate 5, and the machine tool knife rest 18 and the left-right movement of the machine tool machining unit arranged on the machine tool small supporting plate 5 realize efficient machining of workpieces under the drive of the Z-direction transmission screw 9. The various movements of the large machine tool pallet 4, the small machine tool pallet 5, the machine tool rest 18 and the machine tool processing unit are realized by the effective control of the numerical control operation table 6 of the machine tool.

The working principle of the embodiment is as follows: after the machine tool processing unit is additionally arranged in the embodiment, the processing function of the machine tool is increased, the turning of a general workpiece is still completed by the turning tool of the original tool rest of the machine tool, the workpiece such as a large-lead thread which cannot be completed by the turning tool is processed by the power head 15 in a milling mode of high-speed rotation, (which is defined as whirlwind milling by someone), so that a special workpiece can be completed on the machine tool.

The invention aims to solve the problem of the backward movement of the physical gravity center of the large supporting plate 4 of the machine tool caused by the addition of the machine tool processing unit, changes the guide rail placement mode of the common lathe, preposes the first I-shaped supporting plate guide rail 23, postpones the second inverted V-shaped supporting plate guide rail 21 to enable the second inverted V-shaped supporting plate guide rail to be close to the physical gravity center of the large supporting plate 4 of the machine tool, and furthest eliminates the adverse factors when the Z-direction transmission screw 9 moves by postponing the Z-direction transmission screw 9, so that the large supporting plate 4 of the machine tool runs more stably and has minimum abrasion.

According to the invention, by adding the large supporting plate rolling mechanism 3, the sliding motion between the vertical contact surfaces of the large supporting plate 4 of the machine tool is changed into the rolling motion between the bearing surfaces of the rolling mechanism and the vertical surfaces of the guide rails 7 of the machine tool, so that the friction force is reduced; meanwhile, the contact condition of the bearing surface and the vertical guide rail surface of the machine tool can be changed by adjusting the rolling mechanism adjusting bolts 20 around the large supporting plate 4 of the machine tool, so that the large supporting plate 4 of the machine tool is in a floating optimal state, and the machining error in the machine tool manufacturing process can be eliminated by adjusting, so that the large supporting plate 4 of the machine tool runs flexibly and stably, and the machining precision is improved.

Example 2

As shown in fig. 17 to 20, this embodiment is different from embodiment 1 in that: the power head support 14 comprises a frame base body, a lifting adjusting screw 45, a lifting screw support 44 and a lifting adjusting rod nut 43, wherein the frame base body is composed of a support front plate 28, a support bottom plate 33, a support top plate 63, a support rear plate 31 and support side plates 30 which are connected, the number of the support side plates 30 is two, the two support side plates 30 are respectively positioned at the left side and the right side, mounting process holes 32 are respectively formed in the support rear plate 31 and the support side plates 30, an adjusting screw mounting hole 64 is formed in the middle of the support top plate 63, two groups of strip-shaped lifting plate locking through holes 50 are respectively and vertically arranged at intervals on two sides of the support front plate 28, two lifting plate sliding grooves are respectively and vertically formed in the inner sides, close to the two groups of strip-shaped lifting plate locking through holes 50, of strip-shaped lifting rod nut sliding grooves 51 are vertically arranged on the support front plate 28 and positioned between the two lifting plate sliding grooves 49; the lifting screw support 44 is installed at the top of the support top plate 63 and is located at the position of the adjusting screw mounting hole 64, the lower end of the lifting adjusting screw 45 vertically penetrates through the adjusting screw mounting hole 64 and is located in the frame seat, the upper end of the lifting adjusting screw 45 is rotationally connected with the lifting screw support 44, the lifting adjusting screw nut 43 is sleeved at the middle of the lifting adjusting screw 45 and is in threaded fit with the lifting adjusting screw 45, and a second threaded hole perpendicular to the lifting adjusting screw 45 is formed in the front side of the lifting adjusting screw nut 43.

As shown in fig. 21 and 22, the connecting plates include a lifting adjustment connecting plate 46 and a support lifting base plate 47, the support lifting base plate 47 is disposed at the bottom of the power head 15, the lifting adjustment connecting plate 46 is located between the support lifting base plate 47 and the support front plate 28, long arc-shaped power head fixing through holes 55 with a rotation center 36 as a center and three groups of first power head fixing threaded holes 54 distributed in an arc shape are disposed on the lifting adjustment connecting plate 46 from left to right at intervals, arc-shaped rotating plate arc-shaped sliding grooves 53 with the rotation center 36 as a center are disposed on two sides of the lifting adjustment connecting plate 46, lifting plate locking threaded holes 62 are vertically disposed on two sides of the lifting adjustment connecting plate 46, lifting rod female step holes 52 are disposed on the middle lower portion of the lifting adjustment connecting plate 46, and two lifting plate straight sliding grooves 56 are vertically disposed on the rear side of the support lifting base plate 47 and on the inner side of the lifting plate locking threaded holes 62.

As shown in fig. 23 and 24, a second power head fixing threaded hole 61 which is arranged in an arc shape with the rotation center 36 as a circle center is formed in the left part of the support lifting base plate 47, a power head fixing through hole 57 which is arranged in an arc shape with the rotation center 36 as a circle center is formed in the middle part and the rear part of the support lifting base plate 47, a second arc-shaped groove which is arranged in an arc shape with the rotation center 36 as a circle center is formed in the rear side of the support lifting base plate 47, and a rotary plate arc-shaped key bar 58 is arranged in the second arc-shaped groove;

The power head 15 and the support lifting base plate 47 are fixed on the lifting adjustment connecting plate 46 through a first power head fixing bolt 34-1 and a second power head fixing bolt 34-2, the first power head fixing bolt 34-1 passes through a power head fixing through hole 57 and then is in threaded connection with a first power head fixing threaded hole 54, the second power head fixing bolt 34-2 passes through a long arc-shaped power head fixing through hole 55 and then is in threaded connection with a second power head fixing threaded hole 61, the lifting adjustment connecting plate 46 is fixed with the frame base body through a lifting connecting plate fixing bolt 48, the lifting connecting plate fixing bolt 48 passes through a long lifting plate locking through hole 50 and then is in threaded connection with a lifting plate locking threaded hole 62, a second bolt with the end part of which passes through a long strip-shaped lifting rod female slideway hole 51 is arranged at the lifting rod female step hole 52, the second bolt is in threaded fit with the second threaded hole and can slide along the long strip-shaped lifting rod female slideway hole 51, the lifting plate slideway key 49 is in sliding fit with the lifting plate straight slideway 56, and the arc-shaped rotating plate key 58 is in sliding fit with the arc-shaped rotating plate key 53.

In this embodiment, the lifting connection plate fixing bolt 48 fixes the power head 15 and the support lifting base plate 47, and then cooperates with the arc-shaped rotary plate arc chute 53 on the front side of the lifting adjustment connection plate 46 by means of the rotary plate arc-shaped key bar 58 behind the support lifting base plate 47, and makes arc rotary swing along the arc edge of the arc-shaped rotary plate arc chute 53 with the rotary center 36 as the center of a circle, so as to realize the change of the cutter processing angle; meanwhile, the lifting plate straight sliding groove 56 arranged at the rear side of the lifting adjustment connecting plate 46 is matched with the lifting plate sliding groove key strip 49 arranged on the support front plate 28, and moves up and down along the edge of the lifting plate sliding groove key strip 49 under the action of the lifting adjustment screw 45, so that the change of the height of the power head 15 is realized, and the workpiece processing device is suitable for workpieces with different height requirements.

In this embodiment, the structure, connection relationship, and operation principle of the rest are the same as those of embodiment 1.

In summary, compared with the common lathe, the invention is characterized in that the guide rail of the common lathe is rearranged, and the guide rail is opposite to the common guide rail, namely: the first inverted V-shaped support plate guide rail 23 is arranged at the outermost edge right in front of the machine tool, the second inverted V-shaped support plate guide rail 21 is arranged at the rearmost side of the machine tool, the first inverted V-shaped tailstock guide rail 24 is abutted against the first inverted V-shaped support plate guide rail 23, the second inverted V-shaped tailstock guide rail 25 is abutted against the second inverted V-shaped support plate guide rail 21, meanwhile, the Z-direction transmission lead screw 9 is arranged at the rear side of the machine tool body and positioned below the second inverted V-shaped support plate guide rail 21, and the Z-direction transmission lead screw is basically overlapped with the physical gravity center positions of the large support plate 4 and the machine tool machining unit of the machine tool.

The invention is also characterized in that the machine tool processing unit is additionally arranged, and is designed into a structure mode which takes the center of the cutter disc as the rotation center and has a fixed height and an adjustable structure mode, so that the machine tool processing unit can be suitable for different workpieces and machine tools of different models.

The method realizes the change of the processing mode of the common lathe on the spiral workpiece, especially on the large-lead spiral workpiece, so that the processing mode of the improved lathe on the spiral workpiece is changed from the low-speed planing of the lathe tool to the milling mode of high-speed rotation of the cutter head of the power head; therefore, the machining resistance becomes very small and relatively simple, so that the machining capacity of the machine tool is enlarged and the machining precision is improved.

The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any simple modification, variation and equivalent structural transformation of the above embodiment according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A numerical control machine tool, characterized in that: the machine tool comprises a machine tool body (2), a large machine tool supporting plate (4) and a machine tool hydraulic tailstock (11), wherein a machine tool spindle box (1) is arranged at the left end part of the machine tool body (2), a numerical control machine control operation table (6) is arranged at the front side of the machine tool body (2), a machine tool guide rail (7) is arranged at the top of the machine tool body (2) and positioned at the right side of the machine tool spindle box (1), the machine tool guide rail (7) comprises a first inverted V-shaped supporting plate guide rail (23), a first inverted V-shaped tailstock guide rail (24), a second inverted V-shaped tailstock guide rail (25) and a second inverted V-shaped supporting plate guide rail (21) which are horizontally arranged along the length direction of the machine tool body (2), the first inverted V-shaped supporting plate guide rail (23) is positioned at the outermost side of the front part of the machine tool body (2), the second inverted V-shaped supporting plate guide rail (21) is positioned at the outermost side of the rear part of the machine tool body (2), the first inverted V-shaped tailstock guide rail (24) and the second inverted V-shaped tailstock guide rail (25) are both positioned between the first inverted V-shaped supporting plate guide rail (23) and the second inverted V-shaped tailstock guide rail (21) which are adjacent to the first inverted V-shaped tailstock guide rail (21) and the first inverted V-shaped tailstock guide rail (21), the large machine tool support plate (4) is straddled between a first I-shaped support plate guide rail (23) and a second inverted V-shaped support plate guide rail (21) and can slide along the first I-shaped support plate guide rail (23) and the second inverted V-shaped support plate guide rail (21), the front side and the rear side of the large machine tool support plate (4) are horizontally provided with large support plate rolling mechanisms (3), the large machine tool support plate (4) is provided with a small machine tool support plate (5), the front side of the small machine tool support plate (5) is provided with a machine tool knife rest (18), and the rear side of the small machine tool support plate (5) is provided with a machine tool machining unit; the machine tool hydraulic tailstock (11) is straddled between a first inverted V-shaped tailstock guide rail (24) and a second linear tailstock guide rail (25) and can slide along the first inverted V-shaped tailstock guide rail (24) and the second linear tailstock guide rail (25), and a tailstock locking mechanism (10) and a tailstock locking pressing plate (8) are arranged on the machine tool hydraulic tailstock (11); a Z-direction transmission lead screw (9) is arranged at the rear side of the machine tool body (2) and below the second inverted V-shaped supporting plate guide rail (21), and the Z-direction transmission lead screw (9) is parallel to the second inverted V-shaped supporting plate guide rail (21);

The large supporting plate rolling mechanism (3) comprises a rolling mechanism support (3-1), a needle roller bearing (3-2), a rolling mechanism shaft pin (3-3), a disc spring (3-4), a disc spring pad cap (3-5) and a rolling mechanism adjusting bolt (20), wherein the disc spring pad cap (3-5) is arranged at the outer end of the rolling mechanism support (3-1), the disc spring (3-4) is formed by relatively stacking a plurality of disc spring leaves, the disc spring (3-4) is sleeved on an outer end cylinder of the rolling mechanism support (3-1), the needle roller bearing (3-2) and the rolling mechanism shaft pin (3-3) are arranged at the inner end of the rolling mechanism support (3-1), the needle roller bearing (3-2) is fixed with the rolling mechanism support (3-1) through the rolling mechanism shaft pin (3-3), the rolling mechanism adjusting bolt (20) is positioned at the outer side of the disc spring pad cap (3-5), the rolling mechanism adjusting bolt (20) is in threaded connection with a large supporting plate (4) of a machine tool, and the needle roller bearing (3-2) is in contact with a guide rail (7) of the machine tool;

the tailstock locking pressing plate (8) is arranged at the lower part of the tailstock locking mechanism (10), the tailstock locking mechanism (10) comprises a T-shaped locking bolt (10-1), a locking cylinder body (10-2), a locking cylinder piston (10-3), a fastening nut (10-4) and a limiting bushing (10-5), the locking cylinder piston (10-3) and the limiting bushing (10-5) are arranged in the locking cylinder body (10-2), the limiting bushing (10-5) is arranged below the locking cylinder piston (10-3), the upper part of the T-shaped locking bolt (10-1) sequentially penetrates through the bottom of the locking cylinder body (10-2) and the middle part of the locking cylinder piston (10-3), the fastening nut (10-4) is arranged at the upper part of the T-shaped locking bolt (10-1) and connects the locking cylinder piston (10-3) with the locking cylinder body (10-2), the locking cylinder piston (10-2), the limiting bushing (10-5) is arranged below the locking cylinder piston (10-3), the upper part of the T-shaped locking bolt (10-1) and the locking cylinder piston (10-6), an oil inlet and return interface (10-7) communicated with the locking oil cylinder oil cavity (10-6) is arranged in the center of the upper part of the T-shaped locking bolt (10-1); the locking cylinder body (10-2) is arranged in a mounting hole formed in the tailstock locking mechanism (10), and the lower part of the T-shaped locking bolt (10-1) is matched with the step of the tailstock locking pressing plate (8).

2. The numerically controlled machine tool according to claim 1, wherein: the machine tool machining unit comprises a power head support (14), a power head (15), a power head cutter disc (16) and a hydraulic drive motor (13), wherein the power head (15), the power head cutter disc (16) and the hydraulic drive motor (13) are all located on the front side of the power head support (14), the hydraulic drive motor (13) is arranged on the right side of the power head (15), the power head cutter disc (16) is arranged on the left side of the power head (15), the power head (15) is installed on the power head support (14) through a connecting plate and can be adjusted in height on the power head support (14), and the power head support (14) is arranged on the rear side of a small machine tool support plate (5).

3. The numerical control machine tool according to claim 2, wherein: the power head support (14) comprises a frame base body, a rotary adjusting screw (22), a rotary screw support (29) and a rotary adjusting rod nut (35), the frame base body is composed of a support front plate (28), a support bottom plate (33), a support top plate (63), a support back plate (31) and support side plates (30), the number of the support side plates (30) is two, the two support side plates (30) are respectively positioned at the left side and the right side, mounting process holes (32) are respectively formed in the support back plate (31) and the support side plates (30), an adjusting screw mounting hole (64) is formed in the middle of the support top plate (63), four groups of arc power head locking through holes (39) taking a rotary center (36) as a circle center are formed in the support front plate (28) at intervals, the four groups of arc power head locking through holes (39) are sequentially formed in a first group of arc power head locking through holes, a second group of arc power head locking through holes, a third group of arc power head locking through holes and a fourth group of arc power head locking through holes, the support front plate (31) and the arc power head locking through holes (28) are respectively positioned between the first group of arc power heads and the second group of arc power head locking through holes (36) and the arc power head locking through holes (37) which are arranged between the arc power head locking through holes (37) and the rotary center of the arc power head locking through holes, a rod-nut arc-shaped slideway through hole (38) taking a rotation center (36) as a circle center is formed in the support front plate (28) and between the second group of arc-shaped power head locking through holes and the third group of arc-shaped power head locking through holes; the rotary screw support (29) is installed at the top of the support top plate (63) and is located at an adjusting screw installation hole (64), the lower end of the rotary adjusting screw (22) vertically penetrates through the adjusting screw installation hole (64) and is located in the frame base, the upper end of the rotary adjusting screw (22) is rotationally connected with the rotary screw support (29), the rotary adjusting screw nut (35) is sleeved at the middle of the rotary adjusting screw (22) and is in threaded fit with the rotary adjusting screw nut (35), and a first threaded hole perpendicular to the rotary adjusting screw (22) is formed in the front side of the rotary adjusting screw nut (35).

4. A numerical control machine tool according to claim 3, wherein: the connecting plate is a support rotating base plate (27), the support rotating base plate (27) is arranged at the bottom of the power head (15), four groups of power head locking bolt holes (40) which take a rotating center (36) as a circle center and are transparent are arranged on the support rotating base plate (27) at intervals, a lever female connecting step hole (41) is arranged in the middle of the support rotating base plate (27), two groups of first arc-shaped grooves which take the rotating center (36) as the circle center are arranged at the rear side of the support rotating base plate (27), and a rotating plate arc-shaped sliding block (42) is arranged in each first arc-shaped groove; the power head (15) is fixed with the support rotating base plate (27) and the power head support (14) through power head fixing bolts (34) sequentially penetrating through power head locking bolt holes (40) and arc power head locking through holes (39), a first bolt (65) with the end penetrating through a rod female arc-shaped slide way through hole (38) is arranged at a rod female connecting step hole (41), the first bolt (65) is in threaded fit with the first threaded hole and can slide along the rod female arc-shaped slide way through hole (38), and the rotating plate arc-shaped slide block (42) is matched with the rotating plate arc-shaped slide groove (37) and can slide along the rotating plate arc-shaped slide groove (37).

5. The numerical control machine tool according to claim 2, wherein: the power head support (14) comprises a frame base body, lifting adjusting screws (45), lifting screw supports (44) and lifting adjusting rod nuts (43), the frame base body is composed of a support front plate (28), a support bottom plate (33), a support top plate (63), a support rear plate (31) and support side plates (30), the number of the support side plates (30) is two, the two support side plates (30) are respectively located at the left side and the right side, mounting process holes (32) are respectively formed in the support rear plate (31) and the support side plates (30), adjusting screw mounting holes (64) are formed in the middle of the support top plate (63), two groups of strip-shaped lifting plate locking through holes (50) are respectively formed in the two sides of the support front plate (28) at intervals in the vertical direction, two lifting plate sliding grooves are respectively and vertically formed in the inner sides, lifting plate sliding groove strips (49) are respectively arranged in the lifting plate sliding grooves, and two strip-shaped lifting key grooves (51) are respectively formed in the support front plate (28) and are located between the two strip-shaped lifting key grooves (51); the lifting screw support (44) is arranged at the top of the support top plate (63) and is positioned at the position of the adjusting screw mounting hole (64), the lower end of the lifting adjusting screw (45) vertically penetrates through the adjusting screw mounting hole (64) and is positioned in the frame base, the upper end of the lifting adjusting screw (45) is rotationally connected with the lifting screw support (44), the lifting adjusting screw nut (43) is sleeved at the middle part of the lifting adjusting screw (45) and is in threaded fit with the lifting adjusting screw (45), and a second threaded hole perpendicular to the lifting adjusting screw (45) is formed in the front side of the lifting adjusting screw nut (43).

6. The numerically controlled machine tool according to claim 5, wherein: the connecting plate comprises a lifting adjusting connecting plate (46) and a supporting seat lifting base plate (47), the supporting seat lifting base plate (47) is arranged at the bottom of the power head (15), the lifting adjusting connecting plate (46) is positioned between the supporting seat lifting base plate (47) and a supporting seat front plate (28), long arc-shaped power head fixing through holes (55) taking a rotation center (36) as a circle center and three groups of first power head fixing threaded holes (54) distributed in an arc shape are arranged on the lifting adjusting connecting plate (46) at intervals from left to right, arc-shaped rotating plate arc-shaped sliding grooves (53) taking the rotation center (36) as the circle center are formed in two sides of the lifting adjusting connecting plate (46), lifting plate locking threaded holes (62) are vertically formed in two sides of the lifting adjusting connecting plate (46), and two lifting plate straight sliding grooves (56) are vertically formed in the rear side of the supporting seat lifting base plate (47) and in the inner side of the lifting plate locking threaded holes (62);

the left part of the support lifting base plate (47) is provided with a second power head fixing threaded hole (61) which is arranged in an arc shape by taking the rotation center (36) as the circle center, the middle part and the rear part of the support lifting base plate (47) are both provided with power head fixing through holes (57) which are arranged in an arc shape by taking the rotation center (36) as the circle center, the rear side of the support lifting base plate (47) is provided with a second arc-shaped groove which is arranged in an arc shape by taking the rotation center (36) as the circle center, and a rotary plate arc-shaped key bar (58) is arranged in the second arc-shaped groove;

The power head (15) and the support lifting base plate (47) are fixed on the lifting adjustment connecting plate (46) through a first power head fixing bolt (34-1) and a second power head fixing bolt (34-2), the first power head fixing bolt (34-1) penetrates through the power head fixing through hole (57) and then is in threaded connection with the first power head fixing threaded hole (54), the second power head fixing bolt (34-2) penetrates through the long arc-shaped power head fixing through hole (55) and then is in threaded connection with the second power head fixing threaded hole (61), the lifting adjustment connecting plate (46) is fixed with the frame base body through a lifting connecting plate fixing bolt (48), the lifting connecting plate fixing bolt (48) penetrates through the long lifting plate locking through hole (50) and then is in threaded connection with the lifting plate locking threaded hole (62), the second bolt is in threaded fit with the second threaded hole and can slide along the long strip-shaped lifting rod main slide way hole (51), the lifting connecting plate (49) is in sliding fit with the arc-shaped slide groove (53), and the arc-shaped slide groove (53) is in sliding fit with the arc-shaped slide groove (53).

7. The numerical control machine tool according to claim 2, wherein: the shaft head of the power head (15) is a stepped taper shaft head (59), a cutter head taper shaft hole (60) matched with the stepped taper shaft head (59) is formed in the power head cutter head (16), and the power head cutter head (16) is a disc-shaped power head cutter head (16-1) or a slender rod-shaped power head cutter head (16-2).

8. The numerically controlled machine tool according to claim 1, wherein: the machine tool hydraulic tailstock (11) comprises a tailstock base plate (11-2), a tailstock body (11-3) and a tailstock hydraulic cylinder (11-1), the tailstock body (11-3) is arranged on the upper portion of the tailstock base plate (11-2), the tailstock hydraulic cylinder (11-1) is arranged on the upper portion of the tailstock body (11-3), one end of the tailstock hydraulic cylinder (11-1) close to the machine tool spindle box (1) is provided with a tailstock center (11-4), and the tailstock base plate (11-2) straddles between a first inverted V-shaped tailstock guide rail (24) and a second linear tailstock guide rail (25);

the tail seat hydraulic cylinder (11-1) comprises a hydraulic cylinder cavity (11-11), a tail seat shaft sleeve (11-12), a disassembly ejector rod (11-13), a process seal sleeve (11-14), a tail seat cylinder piston (11-15), a shaft sleeve lock nut (11-16) and a tail seat cylinder end cover (11-17), wherein the tail seat shaft sleeve (11-12) is axially arranged in the hydraulic cylinder cavity (11-11), the disassembly ejector rod (11-13) is axially arranged at the right center of the tail seat shaft sleeve (11-12), the tail seat shaft sleeve (11-12) is in sliding fit with the disassembly ejector rod (11-13), the process seal sleeve (11-14) and the tail seat cylinder piston (11-15) are arranged at the outer side of the tail seat shaft sleeve (11-12), the shaft sleeve lock nut (11-16) is arranged at the right end of the tail seat shaft sleeve (11-12) and fixes the tail seat shaft sleeve (11-12) and the tail seat cylinder piston (11-15) through the shaft sleeve lock nut (11-16), and the tail seat cylinder piston (11-14) and the process seal sleeve (11-15) are arranged in the hydraulic cylinder cavity (11-12); the tail seat oil cylinder end cover (11-17) is arranged at the tail part of the hydraulic oil cylinder cavity (11-11) and is fixedly connected with the hydraulic oil cylinder cavity (11-11) through a cylinder cover connecting bolt (11-18), the right end of the disassembly ejector rod (11-13) penetrates out of the tail seat oil cylinder end cover (11-17), the right end of the disassembly ejector rod (11-13) is provided with an ejector rod locking nut (11-19) and fixes the disassembly ejector rod (11-13) and the tail seat oil cylinder end cover (11-17) through the ejector rod locking nut (11-19), and the hydraulic oil cylinder cavity (11-11) is arranged at the upper part of the tail seat body (11-3); the hydraulic oil cylinder comprises a tailstock oil cylinder end cover (11-17), a hydraulic oil cylinder cavity (11-11), a tailstock oil cylinder piston (11-15), a shaft sleeve lock nut (11-16), a tailstock shaft sleeve (11-12) and a disassembly ejector rod (11-13), wherein a jacking acting oil cavity (11-110) is formed between the hydraulic oil cylinder cavity (11-11), the tailstock shaft sleeve (11-12), a process seal sleeve (11-14) and the tailstock oil cylinder piston (11-15), a retreating acting oil cavity (11-111) is formed between the hydraulic oil cylinder cavity (11-11), the tailstock shaft sleeve (11-14) and the tailstock oil cylinder piston (11-15), a jacking acting oil inlet (11-112) communicated with the jacking acting oil cavity (11-110) is arranged on the tailstock oil cylinder end cover (11-17), and a retreating acting oil inlet (11-113) communicated with the retreating acting oil cavity (11-111) is arranged on the hydraulic oil cylinder cavity (11-11); the tail seat is characterized in that a shaft sleeve positioning groove (11-114) is formed in the lower left side of the tail seat shaft sleeve (11-12), a positioning block mounting hole (11-115) is formed in the lower left end of the hydraulic cylinder cavity (11-11), a shaft sleeve positioning block (11-116) is arranged in the positioning block mounting hole (11-115), the shaft sleeve positioning block (11-116) can slide relative to the shaft sleeve positioning groove (11-114), and the tail seat center (11-4) is axially fixed at the left center of the tail seat shaft sleeve (11-12).