CN116275215A - Milling hole device for machining automobile crankshaft - Google Patents

Abstract

The invention relates to the technical field of automobile crankshaft machining, in particular to a milling hole device for automobile crankshaft machining, which comprises a milling machine, wherein a milling hole cutter seat is arranged on the milling machine, a bearing seat is fixed on one side of the milling machine, an installation seat is movably arranged on the upper part of the bearing seat, a main supporting block is fixed at the middle position of the upper part of the installation seat, two sides of the main supporting block are connected with plug plates, a transverse positioning mechanism is arranged in the plug plates and is used for extruding and positioning a crank part of a crankshaft, auxiliary supporting blocks are fixed on the upper part of the installation seat, a plurality of side supporting blocks are fixed on the two sides of the installation seat, the side supporting blocks on the two sides of the installation seat are arranged in a staggered mode, end supporting blocks are fixed on the two sides of the installation seat, compression rods are movably arranged on the two sides of the bearing seat, and a pushing assembly for pushing two compression rods is arranged on the bearing seat. The invention realizes double positioning of the crankshaft in the vertical direction and the horizontal direction, further improves the stability of the crankshaft, and ensures that no offset in any direction can occur during hole milling operation.

Description

Milling hole device for machining automobile crankshaft

Technical Field

The invention relates to the technical field of automobile crankshaft machining, in particular to a hole milling device for automobile crankshaft machining.

Background

The automobile crankshaft is an important part in an automobile engine, the crankshaft mainly comprises a main journal, a connecting rod journal, a crank and connecting shafts at two ends, the crank is used for milling holes on the connecting rod journal and the main journal when being molded and is used for lubricating oil to enter, the automobile crankshaft is required to be completely fixed in the hole milling process of the automobile crankshaft, the automobile crankshaft cannot be enabled to move so as to ensure the quality and the precision of the hole milling of the automobile crankshaft, the fixing of the automobile crankshaft is difficult due to the structural characteristics of the automobile crankshaft, and the automobile crankshaft is easy to move and rotate in the hole milling process of the automobile crankshaft at a position which is not on a middle line, so that the quality and the precision of the hole milling are reduced.

The utility model discloses a milling hole device is used in automobile crankshaft processing through retrieving CN 112872439B, including milling machine, workstation and dysmorphism centre gripping fixing base, the bar centre gripping groove has been seted up at the top of dysmorphism centre gripping fixing base, a plurality of expansion tank has been seted up on the inside wall of bar centre gripping groove bottom, movable mounting has protruding movable seat in the bottom of expansion tank, this milling hole device is used in automobile crankshaft processing reasonable in design, a plurality of bearing seat that can stretch out and draw back has been installed in the bar centre gripping groove, the top of bearing seat is provided with the arc laminating groove, the arc laminating groove of a plurality of bearing seat can laminate in each part of automobile crankshaft completely, when placing the automobile crankshaft on each bearing seat correspondingly, under the spacing effect in arc laminating groove, the automobile crankshaft can carry out the position correction voluntarily, can improve automobile crankshaft's milling hole efficiency effectively, and, prevent automobile crankshaft activity, be favorable to milling hole quality's promotion.

But the present inventors have found that this technical solution still has at least the following drawbacks:

the arc-shaped bearing seat is mainly utilized to position, clamp and fix the crankshaft, but when the crankshaft is positioned and fixed in actual hole milling operation, the crankshaft is fixed in the vertical direction, the transverse direction of the crankshaft is ensured not to deviate, the deviation of the hole site caused by the deviation in hole milling is avoided, the vertical direction and the transverse direction of the crankshaft are not effectively positioned by the bearing seat, and the crankshaft cannot be really abutted against in all directions.

Disclosure of Invention

In view of the above, the present invention aims to provide a hole milling device for machining an automobile crankshaft, so as to solve the problem that the conventional hole milling fixing mechanism cannot well position the crankshaft in the vertical direction and the horizontal direction at the same time.

Based on the above object, the invention provides a milling device for processing an automobile crankshaft

The utility model provides an automobile crankshaft processing is with milling hole device, includes the milling machine, install milling hole blade holder on the milling machine, and milling machine one side is fixed with bears the seat, bears seat upper portion activity and is equipped with the mount pad, mount pad upper portion intermediate position department is fixed with main riding piece, and main riding piece both sides all are connected with the cock plate, are equipped with transverse positioning mechanism in the cock plate, and transverse positioning mechanism is used for extruding the location to the crank portion of bent axle, mount pad upper portion is located main riding piece both sides and is fixed with vice riding piece, and mount pad both sides all are fixed with a plurality of side riding pieces, and the side riding piece dislocation set of both sides, the mount pad both ends all are fixed with the tip riding piece, bear the seat both sides all activity and be equipped with the depression bar, and bear and be equipped with the promotion subassembly that promotes two depression bars up-and-down motion on the seat.

Further, the connecting blocks are fixed on two sides of the main supporting block, the two plug plates are fixed on one end, away from the main supporting block, of the two connecting blocks respectively, the connecting frames are fixed on two ends of the mounting base, and the two end supporting blocks are fixed on one end, away from the mounting base, of the two connecting frames respectively.

Further, the pushing assembly comprises hydraulic rods fixed on two sides of the bottom of the bearing seat, a cross rod is fixed at the output ends of the two hydraulic rods, and the lower ends of the two compression rods are respectively fixed at two ends of the cross rod.

Further, a plurality of guide posts are fixed on the upper portion of the bearing seat, and all penetrate through the mounting seat and are in sliding connection with the mounting seat, and springs are sleeved at the lower ends of the guide posts.

Further, the notch that horizontal positioning mechanism offered including running through the cock plate both sides, the inside both sides upper end of notch all rotates and is equipped with first round pin axle, and the epaxial first connecting rod that all overlaps of first round pin, and the first connecting rod other end all articulates there is the second connecting rod, the second connecting rod other end all slides and locates in the notch, first connecting rod all is equipped with a locating splint with the articulated department of second connecting rod, the cock plate bottom all slides and inserts and have the ejector pin, the ejector pin upper end extends to in the notch and is fixed with the kicking block, two breach are opened on mount pad upper portion, the breach is run through to the ejector pin lower extreme, when the mount pad descends, two ejector pin lower extreme can with bear seat upper portion contact.

Further, the second pin shaft penetrates through the hinged part of the first connecting rod and the second connecting rod, the same connecting sleeve is arranged at two ends of the second pin shaft, the locating clamping plates are all connected to one side of the connecting sleeve in a sliding mode, third pin shafts are all fixed to the lower ends of two sides of the second connecting rod, two limiting grooves are formed in the lower portions of the inner walls of two sides of the notch, and each third pin shaft is respectively arranged in the corresponding limiting groove in a sliding mode.

Further, a plurality of guide pins are fixed on one side, close to the plug plate, of the locating clamping plate, a plurality of guide holes are formed in two sides of the plug plate, one ends of the guide pins are respectively inserted into the corresponding guide holes in a sliding mode, rollers are arranged at the lower ends of the second connecting rods in a rotating mode, and the ejector blocks can contact the rollers when moving upwards.

Further, the mount pad bottom is fixed with the rack, and the rack both sides all have tooth, it has the through-hole to bear to open on the seat, and the rack lower extreme passes the through-hole, it all is fixed with the mounting bracket to bear the seat bottom and be located the rack both sides, all rotates in the mounting bracket and be equipped with the cardboard, and the cardboard has to rotate down spacing, and when two cardboard rotated down spacing, two cardboard one end all meshes with the rack both sides, all install the electro-magnet in the mounting bracket, but the tight cardboard of suction makes it rotate upward and the rack separation after the electro-magnet circular telegram.

Furthermore, a waste tank is arranged on one side of the milling machine, brackets are fixed on two sides of the bottom of the bearing seat, and the other ends of the brackets are fixed in the waste tank.

Further, the main support block and the auxiliary support block are used for supporting main journals of the crankshafts, the plurality of side support blocks on two sides are used for supporting connecting rod journals on two sides of the crankshafts, the two end support blocks are used for supporting connecting shafts on two ends of the crankshafts, and V-shaped support grooves are formed in the upper parts of the main support block, the auxiliary support block, the side support blocks and the end support blocks.

The invention has the beneficial effects that:

1. according to the invention, the main support blocks, the plug plates, the auxiliary support blocks, the side support blocks, the end support blocks and the compression bars are arranged on the mounting seat, and the transverse positioning mechanism and the pushing assembly are matched, so that when the crankshaft is positioned before milling holes, the connecting shafts at two ends of the crankshaft can be placed on the two end support blocks, further the main journal of the crankshaft is placed on the main support blocks and the auxiliary support blocks, the connecting shaft journals of the crankshaft are respectively placed on the side support blocks at two sides, the two plug plates are plugged into the gaps between the cranks, then the pushing assembly is driven to enable the two compression bars to compress the two ends of the crankshaft, the crankshaft and the mounting seat are both lowered and compress the springs, and further the two-way extrusion positioning is carried out on the gaps between the cranks under the action of the transverse positioning mechanism, and the compression bars are matched to realize the double positioning of the crankshaft in the vertical direction and the horizontal direction, so that the stability of the crankshaft is further improved, and no deflection in any direction is ensured during hole milling operation.

Drawings

In order to more clearly illustrate the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only of the invention and that other drawings can be obtained from them without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of an embodiment of the present invention;

FIG. 2 is a schematic plan view of an embodiment of the present invention;

FIG. 3 is a perspective view of a fixing base and a mounting base according to an embodiment of the present invention;

FIG. 4 is a perspective view of a mounting base according to an embodiment of the present invention;

fig. 5 is a schematic perspective view of a main support block and a stopper according to an embodiment of the present invention;

FIG. 6 is a schematic perspective view of a plug board according to an embodiment of the invention;

FIG. 7 is a perspective view of a locating splint according to an embodiment of the present invention;

fig. 8 is a schematic perspective view of a rack according to an embodiment of the present invention;

FIG. 9 is a schematic perspective view of another implementation of a rack;

marked in the figure as:

1. milling machine; 2. a bearing seat; 3. a mounting base; 4. a bracket; 5. a compression bar; 6. a main support block; 7. a hydraulic rod; 8. an end support block; 9. a plug plate; 10. an auxiliary supporting block; 11. a side support block; 12. a connecting block; 13. a guide post; 14. a spring; 15. a connecting frame; 16. a cross bar; 17. a rack; 18. a mounting frame; 19. positioning clamping plates; 20. a guide pin; 21. a push rod; 22. a notch; 23. a guide hole; 24. a limit groove; 25. a top block; 26. a first link; 27. a first pin; 28. connecting sleeves; 29. a second pin; 30. a second link; 31. a third pin; 32. a roller; 33. a clamping plate; 34. an electromagnet; 35. a waste tank; 36. milling a hole tool apron; 37. and (5) an oil cylinder.

Detailed Description

The present invention will be further described in detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent.

It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

As shown in fig. 1-8, a hole milling device for automobile crankshaft machining comprises a milling machine 1, a hole milling cutter seat 36 is installed on the milling machine 1, one side of the milling machine 1 is fixedly provided with a bearing seat 2, the upper part of the bearing seat 2 is movably provided with a mounting seat 3, a main supporting block 6 is fixed at the middle position of the upper part of the mounting seat 3, two sides of the main supporting block 6 are respectively connected with a plug plate 9, a transverse positioning mechanism is arranged in the plug plate 9 and used for extruding and positioning a crank part of a crankshaft, two sides of the main supporting block 6 are fixedly provided with auxiliary supporting blocks 10 on the upper part of the mounting seat 3, two sides of the mounting seat 3 are respectively fixedly provided with a plurality of side supporting blocks 11, two sides of the side supporting blocks 11 are arranged in a staggered mode, two ends of the mounting seat 3 are respectively fixedly provided with an end supporting block 8, two sides of the bearing seat 2 are respectively movably provided with a pressing rod 5, and a pushing assembly for pushing two pressing rods 5 to move up and down is arranged on the bearing seat 2, so that the vertical direction and horizontal direction of the crankshaft are doubly positioned, and the stability of the crankshaft is further improved.

Connecting blocks 12 are fixed on two sides of the main supporting block 6, two plug boards 9 are respectively fixed on one ends, far away from the main supporting block 6, of the two connecting blocks 12, connecting frames 15 are respectively fixed on two ends of the mounting seat 3, and two end supporting blocks 8 are respectively fixed on one ends, far away from the mounting seat 3, of the two connecting frames 15.

The pushing assembly comprises hydraulic rods 7 fixed on two sides of the bottom of the bearing seat 2, a cross rod 16 is fixed at the output ends of the two hydraulic rods 7, the lower ends of the two pressure rods 5 are respectively fixed at two ends of the cross rod 16, the hydraulic rods 7 are driven to drive the two pressure rods 5 to descend through the cross rod 16 to tighten the two ends of a crankshaft, and the crankshaft and the mounting seat 3 are driven to descend.

A plurality of guide posts 13 are fixed on the upper portion of the bearing seat 2, the guide posts 13 penetrate through the mounting seat 3 and are in sliding connection with the mounting seat, and springs 14 are sleeved at the lower ends of the guide posts 13.

The transverse positioning mechanism comprises a notch 22 which is formed in the two sides of the plug plate 9, a first pin shaft 27 is rotatably arranged at the upper ends of the two sides of the notch 22, a first connecting rod 26 is sleeved on the first pin shaft 27, the other end of the first connecting rod 26 is hinged with a second connecting rod 30, the other end of the second connecting rod 30 is slidably arranged in the notch 22, a positioning clamping plate 19 is arranged at the hinged position of the first connecting rod 26 and the second connecting rod 30, a push rod 21 is slidably inserted at the bottom of the plug plate 9, the upper end of the push rod 21 extends into the notch 22 and is fixedly provided with a top block 25, two notches are formed in the upper part of the mounting seat 3, the lower end of the push rod 21 penetrates through the notches, when the mounting seat 3 descends, the lower ends of the two push rods 21 can be in contact with the upper part of the bearing seat 2, the two push rods 21 are in extrusion relative upward movement with the upper part of the bearing seat 2, the two second connecting rods 30 are extrusion relative upward movement with the top block 25, the lower ends of the second connecting rod 30 slide in the notch 22, the upper ends of the second connecting rod 30 are limited by the first connecting rod 26, the first connecting rod 26 is driven to relatively slide the two sides of the second connecting rod 30, the opposite expansion positions of the two sides of the second connecting rod 30 are driven to be relatively stretched, and the crank 19 are driven to be positioned in a crank expansion direction, and the adjacent crank expansion space is positioned in a two directions, and the two directions are positioned in opposite directions.

The articulated department of first connecting rod 26 and second connecting rod 30 runs through there is second round pin axle 29, and second round pin axle 29 both ends are equipped with same adapter sleeve 28, and locating splint 19 all sliding connection is in adapter sleeve 28 one side, and second connecting rod 30 both sides lower extreme all is fixed with third round pin axle 31, and notch 22 both sides inner wall lower part all opens has two spacing grooves 24, and every third round pin axle 31 slides respectively locates in the corresponding spacing groove 24 for locating splint 19 can be to horizontal direction expansion, guarantees to laminate completely with the crank lateral wall.

A plurality of guide pins 20 are fixed on one side of the locating clamping plate 19, which is close to the plug plate 9, a plurality of guide holes 23 are formed in two sides of the plug plate 9, one ends of the guide pins 20 are respectively inserted into the corresponding guide holes 23 in a sliding manner, rollers 32 are respectively arranged at the lower ends of the second connecting rods 30 in a rotating manner, and the ejector blocks 25 can contact the rollers 32 when moving upwards.

The rack 17 is fixed with in mount pad 3 bottom, rack 17 both sides all have the tooth, it has the through-hole to bear to open on the seat 2, rack 17 lower extreme passes the through-hole, it all is fixed with mounting bracket 18 to bear seat 2 bottom and be located rack 17 both sides, all rotate in the mounting bracket 18 and be equipped with cardboard 33, cardboard 33 has and rotates down spacing, when two cardboard 33 rotate down spacing, two cardboard 33 one end all meshes with rack 17 both sides, electromagnet 34 is all installed in the mounting bracket 18, can inhale tight cardboard 33 after the electro-magnet 34 circular telegram makes it change with rack 17 separation, when mount pad 3 moves down, two electro-magnets 34 circular telegram, inhale tight with rack 17 separation with cardboard 33 for rack 17 follows the downward movement when mount pad 3 moves down, after the mount pad 3 moves down in place, electro-magnet 34 outage, cardboard 33 receives gravity effect whereabouts meshing in rack 17 both sides, play auxiliary support effect.

One side of the milling machine 1 is provided with a waste groove 35, two sides of the bottom of the bearing seat 2 are both fixed with brackets 4, and the other ends of the brackets 4 are both fixed in the waste groove 35.

The main support block 6 and the auxiliary support block 10 are used for supporting main journals of crankshafts, the side support blocks 11 on two sides are used for supporting connecting rod journals on two sides of the crankshafts, the two end support blocks 8 are used for supporting connecting shafts on two ends of the crankshafts, and V-shaped support grooves are formed in the upper parts of the main support block 6, the auxiliary support block 10, the side support blocks 11 and the end support blocks 8.

Working principle: before milling holes, the crankshafts are positioned, connecting shafts at two ends of the crankshafts are placed on two end supporting blocks 8, crankshaft main journals are placed on a main supporting block 6 and an auxiliary supporting block 10, crankshaft connecting rod journals are placed on side supporting blocks 11 at two sides respectively, two plug boards 9 are plugged into gaps between two adjacent cranks, then a hydraulic rod 7 is driven to enable two compression rods 5 to press down and tightly press two ends of the crankshafts, a crankshaft and a mounting seat 3 are driven to descend and compress springs 14, at the moment, the lower ends of two push rods 21 are in contact with the upper parts of the bearing seat 2 and are extruded to move relatively upwards, when the push rods 21 and the top blocks 25 move upwards, two second connecting rods 30 are extruded, the lower ends of the second connecting rods 30 slide in notches 22, the upper ends of the second connecting rods 30 are limited by first connecting rods 26, the hinge parts of the first connecting rods 26 and the second connecting rods 30 are driven to be unfolded relatively, so that positioning clamping plates 19 at two sides are driven to be unfolded and tightly pressed on the side walls of the cranks, meanwhile, the two compression rods 5 are fully pressed against the two ends of the cranks, when the hydraulic rod 7 drives the mounting seat 3 to descend, the two electromagnets 33 are driven to move down, the two clamping plates 33 are tightly separated from each other, the two clamping plates 17 are driven to move down, the clamping plates 17 are required to move down, and the clamping plates are meshed with each clamping plates are required to be positioned, and clamped by the clamping plates are placed on the clamping plates, and the clamping plates 17, and the clamping plates are positioned at the two sides of the clamping plates are positioned at the two sides, and are positioned at the opposite sides of the opposite sides, and the opposite sides of the clamping plates are required to be meshed.

In addition, the combination of the clamping plate 33 and the electromagnet 34 can be replaced by a clamping plate 33 and an oil cylinder 35 as shown in fig. 9. The oil cylinder 35 is hinged between the clamping plate 33 and the mounting frame 18, the oil cylinder 35 is propped against the lower side of the clamping plate 33, when the oil cylinder 35 stretches out, the clamping plate 33 can prop against the rack 17, the oil cylinder retracts, and the clamping plate 33 can withdraw from the rack 17. Before the mounting seat 3 moves downwards, the oil cylinder is in a retracted state, and after the mounting seat 3 moves downwards to a proper position, when the oil cylinder 35 stretches out, the clamping plate 33 pushes against the rack 17 to position the rack 17.

Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the invention (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

The present invention is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the present invention should be included in the scope of the present invention.

Claims (10)

1. The utility model provides an automobile crankshaft processing is with milling hole device, includes milling machine (1), its characterized in that, install milling hole blade holder (36) on milling machine (1), and milling machine (1) one side is fixed with and bears seat (2), bear seat (2) upper portion activity and be equipped with mount pad (3), mount pad (3) upper portion intermediate position department is fixed with main support piece (6), main support piece (6) both sides all are connected with cock plate (9), be equipped with transverse positioning mechanism in cock plate (9), transverse positioning mechanism is used for the crank portion extrusion location to the bent axle, mount pad (3) upper portion is located main support piece (6) both sides and is fixed with vice support piece (10), and mount pad (3) both sides all are fixed with a plurality of side support pieces (11), side support piece (11) of both sides dislocation set, mount pad (3) both ends all are fixed with tip support piece (8), bear seat (2) both sides all activity and are equipped with depression bar (5), and are equipped with the promotion subassembly that promotes two depression bar (5) up-down movements on bearing seat (2).

2. The hole milling device for machining the automobile crankshaft according to claim 1, wherein connecting blocks (12) are fixed on two sides of the main supporting block (6), two plug plates (9) are respectively fixed on one end, far away from the main supporting block (6), of the two connecting blocks (12), connecting frames (15) are respectively fixed on two ends of the mounting seat (3), and two end supporting blocks (8) are respectively fixed on one end, far away from the mounting seat (3), of the two connecting frames (15).

3. The hole milling device for machining the automobile crankshaft according to claim 1, wherein the pushing assembly comprises hydraulic rods (7) fixed on two sides of the bottom of the bearing seat (2), a cross rod (16) is fixed at the output ends of the two hydraulic rods (7), and the lower ends of the two pressing rods (5) are respectively fixed at two ends of the cross rod (16).

4. The hole milling device for machining the automobile crankshaft according to claim 1, wherein a plurality of guide posts (13) are fixed on the upper portion of the bearing seat (2), the guide posts (13) penetrate through the mounting seat (3) and are in sliding connection with the mounting seat, and springs (14) are sleeved at the lower ends of the guide posts (13).

5. The milling hole device for machining the automobile crankshaft according to claim 1, wherein the transverse positioning mechanism comprises a notch (22) formed in two sides of a penetrating plug plate (9), first pin shafts (27) are rotatably arranged at the upper ends of two sides of the notch (22), first connecting rods (26) are sleeved on the first pin shafts (27), second connecting rods (30) are hinged to the other ends of the first connecting rods (26), the other ends of the second connecting rods (30) are slidably arranged in the notch (22), positioning clamping plates (19) are slidably arranged at hinged positions of the first connecting rods (26) and the second connecting rods (30), ejector rods (21) are slidably inserted into the bottoms of the plug plate (9), the upper ends of the ejector rods (21) extend into the notch (22) and are fixedly provided with ejector blocks (25), two notches are formed in the upper portions of the mounting seats (3), the lower ends of the ejector rods (21) penetrate through the notches, and when the mounting seats (3) descend, the lower ends of the two ejector rods (21) can be contacted with the upper portions of the bearing seats (2).

6. The hole milling device for machining automobile crankshafts according to claim 5, wherein a second pin shaft (29) penetrates through the hinge joint of the first connecting rod (26) and the second connecting rod (30), the same connecting sleeve (28) is arranged at two ends of the second pin shaft (29), the locating clamping plates (19) are all connected to one side of the connecting sleeve (28) in a sliding mode, third pin shafts (31) are all fixed at the lower ends of two sides of the second connecting rod (30), two limiting grooves (24) are formed in the lower portions of the inner walls of two sides of the notch (22), and each third pin shaft (31) is respectively arranged in the corresponding limiting groove (24) in a sliding mode.

7. The milling hole device for machining the automobile crankshaft according to claim 6, wherein a plurality of guide pins (20) are fixed on one side, close to the plug plate (9), of the locating clamping plate (19), a plurality of guide holes (23) are formed in two sides of the plug plate (9), one ends of the guide pins (20) are respectively and slidably inserted into the corresponding guide holes (23), rollers (32) are rotatably arranged at the lower ends of the second connecting rods (30), and the ejector blocks (25) can contact the rollers (32) when moving upwards.

8. The milling hole device for machining automobile crankshafts according to claim 1, wherein racks (17) are fixed at the bottoms of the mounting seats (3), teeth are arranged on two sides of each rack (17), through holes are formed in the bearing seats (2), the lower ends of the racks (17) penetrate through the through holes, mounting frames (18) are fixed on two sides of the racks (17) at the bottoms of the bearing seats (2), clamping plates (33) are rotatably arranged in the mounting frames (18), the clamping plates (33) are rotatably lower limit, when the two clamping plates (33) rotate to the lower limit, one ends of the two clamping plates (33) are meshed with two sides of the racks (17), electromagnets (34) are arranged in the mounting frames (18), and the clamping plates (33) can be sucked tightly after the electromagnets (34) are electrified to enable the clamping plates to rotate upwards and be separated from the racks (17).

9. The hole milling device for machining the automobile crankshaft according to claim 1, wherein a waste groove (35) is formed in one side of the milling machine (1), the two sides of the bottom of the bearing seat (2) are both fixed with a support (4), and the other ends of the support (4) are both fixed in the waste groove (35).

10. The hole milling device for machining automobile crankshafts according to any one of claims 1 to 9, wherein the main support block (6) and the auxiliary support block (10) are used for supporting main journals of crankshafts, the plurality of side support blocks (11) on two sides are used for supporting connecting rod journals on two sides of the crankshafts, the two end support blocks (8) are used for supporting connecting shafts on two ends of the crankshafts, and V-shaped support grooves are formed in the upper parts of the main support block (6), the auxiliary support block (10), the side support blocks (11) and the end support blocks (8).

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