CN103758959B - The long rolling ball screw rod bracket device that nut rotates - Google Patents
The long rolling ball screw rod bracket device that nut rotates Download PDFInfo
- Publication number
- CN103758959B CN103758959B CN201310628343.8A CN201310628343A CN103758959B CN 103758959 B CN103758959 B CN 103758959B CN 201310628343 A CN201310628343 A CN 201310628343A CN 103758959 B CN103758959 B CN 103758959B
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- Prior art keywords
- piston
- oil cylinder
- supporting plate
- support supporting
- ball screw
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/001—Arrangements compensating weight or flexion on parts of the machine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
- F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
- F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
- F16H25/20—Screw mechanisms
- F16H25/24—Elements essential to such mechanisms, e.g. screws, nuts
- F16H2025/2436—Intermediate screw supports for reducing unsupported length of screw shaft
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
Abstract
The invention discloses the long rolling ball screw rod bracket device that a kind of nut rotates, feed screw nut (18) is arranged on slide (1) and goes up and form threaded engagement with described screw mandrel (8), the support supporting plate (9) of level is provided with in described screw mandrel (8) below, the below of described support supporting plate (9) is provided with hydraulic pressure installation, the oil cylinder (14) of described hydraulic pressure installation is fixed on lathe bed (16), the piston (12) of this hydraulic pressure installation stretches out vertically from described oil cylinder (14), described support supporting plate (9) is fixedly connected with the end face that stretches out of described piston (12).The present invention adopts technology that is mechanical, electrical, liquid combination, and solve a supporting difficult problem for the long ball screw that nut rotates, its supporting structure adopts hydraulic transmission to carry out the motion of supporting, and its control mode is reliable, stable drive, supporting stabilizer.
Description
Technical field
The invention belongs to the technical field of mechanical processing machine, relate to the structure of NC heavy floor type boring and milling machine, more particularly, the present invention relates to the long rolling ball screw rod bracket device that a kind of nut rotates.
Background technique
NC heavy floor type boring and milling machine is in course of working, and the column of lathe moves (X-axis) in the horizontal direction, general employing ball leading screw driving mode.
For preventing screw mandrel sagging, affecting machine tool accuracy, often using holder for screw rod supplemental support screw mandrel.When stroke is more than 6 meters, adopt the ball wire bar pair kind of drive that nut rotates.Nut rotated versions is more much bigger than the nut boundary dimension of screw mandrel rotated versions.
Below in conjunction with accompanying drawing, prior art is analyzed:
When screw mandrel rotates, nut boundary dimension is little, and adopt the holder for screw rod of Purely mechanical, as shown in Figure 1 and Figure 2, copper roller 4 holds screw mandrel 3.
Move at slide 2, nut is when moving to above bracket, as shown in Figure 2, only at the outer side surface of nut, two long press strips 1 need be installed, push down the upper saw pulley 5 on both sides, whole bracket portion be declined and puts in place; When the motion of slide 2 reversing of motion, nut leave, long press strip 1 is also along with leaving upper saw pulley 5, and whole bracket portion rises and puts in place under the effect of spring 6 power, and copper roller 4 holds screw mandrel again.
When nut rotates, nut boundary dimension is large, limits, cannot adopt Purely mechanical holder for screw rod by spatial position.
Summary of the invention
The invention provides the long rolling ball screw rod bracket device that a kind of nut rotates, its objective is the supporting difficult problem solving the long ball screw that nut rotates.
To achieve these goals, the technological scheme that the present invention takes is:
The long rolling ball screw rod bracket device that nut of the present invention rotates, feed screw nut to be arranged on slide and to form threaded engagement with described screw mandrel, the support supporting plate of level is provided with below described screw mandrel, the below of described support supporting plate is provided with hydraulic pressure installation, the oil cylinder of described hydraulic pressure installation is fixed on lathe bed, the piston of this hydraulic pressure installation stretches out vertically from described oil cylinder, and described support supporting plate is fixedly connected with the end face that stretches out of described piston.
The external part of described piston is closed end, its opposite end is opening, described piston cavity is communicated with described cylinder cavity, formed without oil cavity, describedly be provided with spring without in oil cavity, described spring is Compress Spring, and the interior edge face of oil cylinder is withstood in its one end, and the other end withstands the interior resonator end surface of described piston; The oil pocket of described oil cylinder is located between the outer surface of piston and the internal surface of oil cylinder; Described oil cylinder is established oil connection be communicated with described oil pocket.
Spacer is provided with between described support supporting plate and piston.
Described slide is provided with induction bar, and described lathe bed is provided with induction switch, and described induction switch is located at the relevant position on induction bar movement locus.
Described support supporting plate is provided with induction piece, and described lathe bed is provided with proximity switch; Described proximity switch is located at induction piece and drops to minimum relevant position.
Or described support supporting plate is provided with proximity switch, and described lathe bed is provided with induction piece; Described induction piece is located at proximity switch and drops to minimum relevant position.
Described slide is provided with support, and described support is provided with position limit switch, and described support supporting plate is provided with collision block, and described position limit switch is located at collision block and rises to the highest relevant position.
Or described slide is provided with support, described support is provided with collision block, and described support supporting plate is provided with position limit switch, and described collision block is located at position limit switch and rises to the highest relevant position.
Technique scheme of the present invention, adopt technology that is mechanical, electrical, liquid combination, solve a supporting difficult problem for the long ball screw that nut rotates, its supporting structure adopts hydraulic transmission to carry out the motion of supporting, and its control mode is reliable, stable drive, supporting stabilizer.
Accompanying drawing explanation
Below the content expressed by each width accompanying drawing of this specification and the mark in figure are briefly described:
Fig. 1 is the schematic diagram of the carrier structure described in background technique under bearing state;
Fig. 2 is the schematic diagram of the carrier structure described in background technique under disengaging bearing state;
Fig. 3 is structural representation of the present invention;
Fig. 4 is schematic top plan view of the present invention.
Being labeled as in Fig. 2:
1, long press strip, 2, slide, 3, screw mandrel, 4, copper roller, 5, upper saw pulley, 6, spring;
Being labeled as in Fig. 3 and Fig. 4:
1, slide, 2, support, 3, position limit switch, 4, proximity switch, 5, collision block, 6, locking nut, 7, induction piece, 8, screw mandrel, 9, support supporting plate, 10, spring, 11, spacer, 12, piston, 13, oil connection, 14, oil cylinder, 15, oil cylinder cover, 16, lathe bed, 17, induction switch, 18, feed screw nut, 19, induction bar.
Embodiment
Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technological scheme.
Structure of the present invention expressed by Fig. 3, Fig. 4 is the long rolling ball screw rod bracket device that a kind of nut rotates, and feed screw nut 18 to be arranged on slide 1 and to form threaded engagement with described screw mandrel 8.
In order to solve prior art Problems existing and overcome its defect, realize the goal of the invention of the supporting difficult problem solving the long ball screw that nut rotates, the technological scheme that the present invention takes is:
As shown in Figure 3, the long rolling ball screw rod bracket device that nut of the present invention rotates, the support supporting plate 9 of level is provided with below described screw mandrel 8, the below of described support supporting plate 9 is provided with hydraulic pressure installation, the oil cylinder 14 of described hydraulic pressure installation is fixed on lathe bed 16, the piston 12 of this hydraulic pressure installation stretches out vertically from described oil cylinder 14, and described support supporting plate 9 is fixedly connected with the end face that stretches out of described piston 12.
In actual manufacturing and production process, in order to solve the problem, solve a supporting difficult problem for the long ball screw that nut rotates, the present invention adopts bracket system that is mechanical, electrical, liquid combination, carry out supplemental support screw mandrel, its supporting structure adopts hydraulic transmission to carry out the motion of supporting, stable drive, supporting stabilizer; Adopt technology that is mechanical, electrical, liquid combination, its control mode is reliable.
The hydraulic support structure of bracket system is as shown in Figure 3:
The external part of described piston 12 is closed end, its opposite end is opening, described piston 12 inner chamber and described oil cylinder 14 inner space, formed without oil cavity, described without being provided with spring 10 in oil cavity, described spring 10 is Compress Spring, and the interior edge face (interior edge face of the oil cylinder cover 15 namely in figure) of oil cylinder 14 is withstood in its one end, and the other end withstands the interior resonator end surface of described piston 12; The oil pocket of described oil cylinder 14 is located between the outer surface of piston 12 and the internal surface of oil cylinder 14; Described oil cylinder 14 establish oil connection 13 to be communicated with described oil pocket.
When feed screw nut 18 is away from bracket system, support supporting plate 9 and rely on the driving of piston 12 to rise, supplemental support lives screw mandrel 8, improves the supporting rigidity of screw mandrel 8.
When feed screw nut 18 is close to bracket system, supports supporting plate 9 and leave screw mandrel 8, can not produce feed screw nut 18 and interfere.
Spacer 11 is provided with between described support supporting plate 9 and piston 12.By regulating the thickness of spacer 11, regulate the support height supporting supporting plate 9.
As shown in Figure 4:
Described slide 1 is provided with induction bar 19, and described lathe bed 16 is provided with induction switch 17, and described induction switch 17 is located at the relevant position on induction bar 19 movement locus.
Move feed screw nut 18, when soon moving to above bracket system, induction switch 17 senses induction bar 19, and send electrical signal, oil connection 13 oil-feed, under the effect of the pressure of hydraulic oil, whole bracket system drops to home.
When feed screw nut 18 leaves bracket system to safe distance time, induction switch 17 leaves induction bar 19, sends electrical signal, oil connection 13 stops oil-feed, under the effect of the elastic force of spring 10, and oil connection 13 oil return, whole bracket system rises and puts in place, carries out the supporting to screw mandrel 8.
In order to ensureing to support supporting plate 9 must when dropping to minimum, just feed screw nut 18 can carry out rotating and moving, taking following two different modes, an application can be selected:
1, described support supporting plate 9 is provided with induction piece 7, and described lathe bed 16 is provided with proximity switch 4; Described proximity switch 4 is located at induction piece 7 and drops to minimum relevant position.
2, described support supporting plate 9 is provided with proximity switch 4, and described lathe bed 16 is provided with induction piece 7; Described induction piece 7 is located at proximity switch 4 and drops to minimum relevant position.
Only have induction switch 4 to sense induction piece 7 electrical signal, feed screw nut 18 could rotate and continue to move forward.Ensure that Safety performance.
In order to ensure at induction switch 17 when breaking down, correctly can not sending signal, ensure the safety of lathe, take following two different modes, an application can be selected:
1, described slide 1 is provided with support 2, and described support 2 is provided with position limit switch 3, and described support supporting plate 9 is provided with collision block 5, and described position limit switch 3 is located at collision block 5 and rises to the highest relevant position.
2, described slide 1 is provided with support 2, and described support 2 is provided with collision block 5, and described support supporting plate 9 is provided with position limit switch 3, and described collision block 5 is located at position limit switch 3 and rises to the highest relevant position.
If induction switch 17 is out of order, do not signal, whole bracket system does not decline, then collision block 5 encountered by position limit switch 3, signals, system alarm, feed screw nut 18 stop motion.
Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technological scheme is carried out; or design of the present invention and technological scheme directly applied to other occasion, all within protection scope of the present invention without to improve.
Claims (16)
1. the long rolling ball screw rod bracket device of nut rotation, feed screw nut (18) is arranged on slide (1) and goes up and form threaded engagement with described screw mandrel (8);
It is characterized in that:
The support supporting plate (9) of level is provided with in described screw mandrel (8) below, the below of described support supporting plate (9) is provided with hydraulic pressure installation, the oil cylinder (14) of described hydraulic pressure installation is fixed on lathe bed (16), the piston (12) of this hydraulic pressure installation stretches out vertically from described oil cylinder (14), and described support supporting plate (9) is fixedly connected with the end face that stretches out of described piston (12);
Described support supporting plate (9) is provided with induction piece (7), and described lathe bed (16) is provided with proximity switch (4); Described proximity switch (4) is located at induction piece (7) and drops to minimum relevant position.
2. according to the long rolling ball screw rod bracket device that nut according to claim 1 rotates, it is characterized in that: the external part of described piston (12) is closed end, its opposite end is opening, described piston (12) inner chamber and described oil cylinder (14) inner space, formed without oil cavity, described without being provided with spring (10) in oil cavity, described spring (10) is Compress Spring, the interior edge face of oil cylinder (14) is withstood in its one end, and the other end withstands the interior resonator end surface of described piston (12); The oil pocket of described oil cylinder (14) is located between the outer surface of piston (12) and the internal surface of oil cylinder (14); Described oil cylinder (14) establish oil connection (13) to be communicated with described oil pocket.
3. according to the long rolling ball screw rod bracket device that nut according to claim 1 rotates, it is characterized in that: between described support supporting plate (9) and piston (12), be provided with spacer (11).
4. according to the long rolling ball screw rod bracket device that nut according to claim 1 rotates, it is characterized in that: described slide (1) is provided with induction bar (19), described lathe bed (16) is provided with induction switch (17), and described induction switch (17) is located at the relevant position on induction bar (19) movement locus.
5. the long rolling ball screw rod bracket device of nut rotation, feed screw nut (18) is arranged on slide (1) and goes up and form threaded engagement with described screw mandrel (8);
It is characterized in that:
The support supporting plate (9) of level is provided with in described screw mandrel (8) below, the below of described support supporting plate (9) is provided with hydraulic pressure installation, the oil cylinder (14) of described hydraulic pressure installation is fixed on lathe bed (16), the piston (12) of this hydraulic pressure installation stretches out vertically from described oil cylinder (14), and described support supporting plate (9) is fixedly connected with the end face that stretches out of described piston (12);
Described support supporting plate (9) is provided with proximity switch (4), and described lathe bed (16) is provided with induction piece (7); Described induction piece (7) is located at proximity switch (4) and drops to minimum relevant position.
6. according to the long rolling ball screw rod bracket device that nut according to claim 5 rotates, it is characterized in that: the external part of described piston (12) is closed end, its opposite end is opening, described piston (12) inner chamber and described oil cylinder (14) inner space, formed without oil cavity, described without being provided with spring (10) in oil cavity, described spring (10) is Compress Spring, the interior edge face of oil cylinder (14) is withstood in its one end, and the other end withstands the interior resonator end surface of described piston (12); The oil pocket of described oil cylinder (14) is located between the outer surface of piston (12) and the internal surface of oil cylinder (14); Described oil cylinder (14) establish oil connection (13) to be communicated with described oil pocket.
7. according to the long rolling ball screw rod bracket device that nut according to claim 5 rotates, it is characterized in that: between described support supporting plate (9) and piston (12), be provided with spacer (11).
8. according to the long rolling ball screw rod bracket device that nut according to claim 5 rotates, it is characterized in that: described slide (1) is provided with induction bar (19), described lathe bed (16) is provided with induction switch (17), and described induction switch (17) is located at the relevant position on induction bar (19) movement locus.
9. the long rolling ball screw rod bracket device of nut rotation, feed screw nut (18) is arranged on slide (1) and goes up and form threaded engagement with described screw mandrel (8);
It is characterized in that:
The support supporting plate (9) of level is provided with in described screw mandrel (8) below, the below of described support supporting plate (9) is provided with hydraulic pressure installation, the oil cylinder (14) of described hydraulic pressure installation is fixed on lathe bed (16), the piston (12) of this hydraulic pressure installation stretches out vertically from described oil cylinder (14), and described support supporting plate (9) is fixedly connected with the end face that stretches out of described piston (12);
Described slide (1) is provided with support (2), and described support (2) is provided with position limit switch (3), and described support supporting plate (9) is provided with collision block (5), and described position limit switch (3) is located at collision block (5) and rises to the highest relevant position.
10. according to the long rolling ball screw rod bracket device that nut according to claim 9 rotates, it is characterized in that: the external part of described piston (12) is closed end, its opposite end is opening, described piston (12) inner chamber and described oil cylinder (14) inner space, formed without oil cavity, described without being provided with spring (10) in oil cavity, described spring (10) is Compress Spring, the interior edge face of oil cylinder (14) is withstood in its one end, and the other end withstands the interior resonator end surface of described piston (12); The oil pocket of described oil cylinder (14) is located between the outer surface of piston (12) and the internal surface of oil cylinder (14); Described oil cylinder (14) establish oil connection (13) to be communicated with described oil pocket.
The 11. long rolling ball screw rod bracket devices rotated according to nut according to claim 9, is characterized in that: be provided with spacer (11) between described support supporting plate (9) and piston (12).
The 12. long rolling ball screw rod bracket devices rotated according to nut according to claim 9, it is characterized in that: described slide (1) is provided with induction bar (19), described lathe bed (16) is provided with induction switch (17), and described induction switch (17) is located at the relevant position on induction bar (19) movement locus.
The long rolling ball screw rod bracket device that 13. nuts rotate, feed screw nut (18) is arranged on slide (1) and goes up and form threaded engagement with described screw mandrel (8);
It is characterized in that:
The support supporting plate (9) of level is provided with in described screw mandrel (8) below, the below of described support supporting plate (9) is provided with hydraulic pressure installation, the oil cylinder (14) of described hydraulic pressure installation is fixed on lathe bed (16), the piston (12) of this hydraulic pressure installation stretches out vertically from described oil cylinder (14), and described support supporting plate (9) is fixedly connected with the end face that stretches out of described piston (12);
Described slide (1) is provided with support (2), and described support (2) is provided with collision block (5), and described support supporting plate (9) is provided with position limit switch (3), and described collision block (5) is located at position limit switch (3) and rises to the highest relevant position.
The 14. long rolling ball screw rod bracket devices rotated according to nut according to claim 13, it is characterized in that: the external part of described piston (12) is closed end, its opposite end is opening, described piston (12) inner chamber and described oil cylinder (14) inner space, formed without oil cavity, described without being provided with spring (10) in oil cavity, described spring (10) is Compress Spring, the interior edge face of oil cylinder (14) is withstood in its one end, and the other end withstands the interior resonator end surface of described piston (12); The oil pocket of described oil cylinder (14) is located between the outer surface of piston (12) and the internal surface of oil cylinder (14); Described oil cylinder (14) establish oil connection (13) to be communicated with described oil pocket.
The 15. long rolling ball screw rod bracket devices rotated according to nut according to claim 13, is characterized in that: be provided with spacer (11) between described support supporting plate (9) and piston (12).
The 16. long rolling ball screw rod bracket devices rotated according to nut according to claim 13, it is characterized in that: described slide (1) is provided with induction bar (19), described lathe bed (16) is provided with induction switch (17), and described induction switch (17) is located at the relevant position on induction bar (19) movement locus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310628343.8A CN103758959B (en) | 2013-11-28 | 2013-11-28 | The long rolling ball screw rod bracket device that nut rotates |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310628343.8A CN103758959B (en) | 2013-11-28 | 2013-11-28 | The long rolling ball screw rod bracket device that nut rotates |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103758959A CN103758959A (en) | 2014-04-30 |
| CN103758959B true CN103758959B (en) | 2015-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310628343.8A Active CN103758959B (en) | 2013-11-28 | 2013-11-28 | The long rolling ball screw rod bracket device that nut rotates |
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| Country | Link |
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| CN (1) | CN103758959B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201116594Y (en) * | 2007-10-19 | 2008-09-17 | 大连华根机械有限公司 | Long screw rod collapsed waist lifting mechanism |
| CN101324264A (en) * | 2008-06-11 | 2008-12-17 | 杭州机床集团有限公司 | Long lead screw hydraulic type flexible supporting device |
| CN202162607U (en) * | 2011-06-28 | 2012-03-14 | 陕西汉江机床有限公司 | Super-long stroke precision transmission device |
| WO2012120670A1 (en) * | 2011-03-09 | 2012-09-13 | 株式会社日立製作所 | Linear actuator |
| CN202851851U (en) * | 2012-10-24 | 2013-04-03 | 成都飞机工业（集团）有限责任公司 | Auxiliary support device of long drive screw |
| CN203585248U (en) * | 2013-11-28 | 2014-05-07 | 芜湖恒升重型机床股份有限公司 | Nut rotating long ball screw bracket device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8701834B2 (en) * | 2010-08-20 | 2014-04-22 | Nook Industries, Inc. | Mechanical actuator |
-
2013
- 2013-11-28 CN CN201310628343.8A patent/CN103758959B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201116594Y (en) * | 2007-10-19 | 2008-09-17 | 大连华根机械有限公司 | Long screw rod collapsed waist lifting mechanism |
| CN101324264A (en) * | 2008-06-11 | 2008-12-17 | 杭州机床集团有限公司 | Long lead screw hydraulic type flexible supporting device |
| WO2012120670A1 (en) * | 2011-03-09 | 2012-09-13 | 株式会社日立製作所 | Linear actuator |
| CN202162607U (en) * | 2011-06-28 | 2012-03-14 | 陕西汉江机床有限公司 | Super-long stroke precision transmission device |
| CN202851851U (en) * | 2012-10-24 | 2013-04-03 | 成都飞机工业（集团）有限责任公司 | Auxiliary support device of long drive screw |
| CN203585248U (en) * | 2013-11-28 | 2014-05-07 | 芜湖恒升重型机床股份有限公司 | Nut rotating long ball screw bracket device |
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| Publication number | Publication date |
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| CN103758959A (en) | 2014-04-30 |
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