CN107671582B - Main shaft replacing device for efficient slicing machine - Google Patents
Main shaft replacing device for efficient slicing machine Download PDFInfo
- Publication number
- CN107671582B CN107671582B CN201710759253.0A CN201710759253A CN107671582B CN 107671582 B CN107671582 B CN 107671582B CN 201710759253 A CN201710759253 A CN 201710759253A CN 107671582 B CN107671582 B CN 107671582B
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- Prior art keywords
- clamping block
- fixing
- main shaft
- base
- lower clamping
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- 230000000149 penetrating effect Effects 0.000 claims description 5
- 230000033001 locomotion Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/12—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for securing to a spindle in general
-
- 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
Abstract
The invention provides a spindle replacement device for a high-efficiency slicing machine, and belongs to the technical field of machinery. The technical problems that a main shaft on an existing slicing machine is inconvenient to replace and the like are solved. The main shaft replacing device for the efficient slicing machine comprises a base, and is characterized in that an inclined fixing plate is arranged on the base and is fixed on the base through a bracket; one side of the inclined fixed plate is hinged with a movable frame, and the movable frame is positioned at the lower part of the inclined fixed plate; the other side of the inclined fixed plate is hinged with a movable seat, and the movable seat is positioned at the high part of the inclined fixed plate; the movable seat is fixedly provided with a push rod motor. The invention has the advantage of conveniently and accurately replacing the main shaft on the equipment.
Description
Technical Field
The invention belongs to the technical field of machinery, and particularly relates to a spindle replacement device for a high-efficiency slicing machine.
Background
The main shaft of the machine tool refers to a shaft on the machine tool for driving a workpiece or a cutter to rotate. The spindle unit is usually composed of a spindle, a bearing, a transmission member (gear or pulley), and the like. The machine is mainly used for supporting transmission parts such as gears and pulleys, transmitting motion and torque such as a machine tool spindle, and clamping workpieces such as spindles. Most of the machine tools have a spindle unit, except for those in which the main motion of the planer, broacher, etc. is linear motion. The accuracy of movement and structural rigidity of the spindle unit are important factors in determining machining quality and cutting efficiency. The indexes for measuring the performance of the main shaft component are mainly rotation precision, rigidity and speed adaptability. (1) The rotation precision is that radial and axial runout (see form and position tolerance) occurs in the direction affecting the machining precision when the main shaft rotates, and is mainly determined by the manufacturing and assembly quality of the main shaft and the bearing. (2) Dynamic and static rigidity is mainly determined by bending rigidity of the main shaft, rigidity of the bearing and damping. (3) Speed adaptation, the maximum allowable speed and speed range, is mainly determined by the structure and lubrication of the bearing, and the heat dissipation conditions.
The main shaft plays a vital role on the machine tool, errors caused by inaccurate installation are caused, when the bearing starts to deviate in operation, mechanical damage is easy to cause, the main shaft on the slicing machine is huge, and a crane is required to lift the main shaft in general for replacing the main shaft, but the main shaft is very inconvenient to replace by the method.
Disclosure of Invention
The invention aims at solving the problems in the prior art, and provides a main shaft replacing device for a high-efficiency slicing machine, which aims at solving the problems: how to conveniently and accurately replace the main shaft on the equipment.
The aim of the invention can be achieved by the following technical scheme: the main shaft replacing device for the efficient slicing machine comprises a base, and is characterized in that an inclined fixing plate is arranged on the base and is fixed on the base through a bracket; one side of the inclined fixed plate is hinged with a movable frame, and the movable frame is positioned at the lower part of the inclined fixed plate; the other side of the inclined fixed plate is hinged with a movable seat, and the movable seat is positioned at the high part of the inclined fixed plate; a push rod motor is fixedly arranged on the movable seat; the middle part of the inclined fixing plate is fixedly provided with a fixing rod, the upper part of the fixing rod is movably provided with a rotating rod, one end of the rotating rod is connected with an output shaft of the push rod motor, and the other end of the rotating rod is connected with the middle part of the movable frame through a pull rod; the base is provided with a hydraulic cylinder, the movable frame is provided with a hydraulic support column, the hydraulic cylinder is connected with the hydraulic support column through an oil pipe, the end part of the hydraulic support column is fixedly provided with a bearing table, the bearing table is movably provided with a sliding block, and the sliding block is provided with a clamping device for clamping the main shaft; the lifting mechanism for lifting the base up and down is also arranged below the base.
The working principle of the invention is as follows: starting a push rod motor, starting parallel movement of an output shaft of the push rod motor, moving an output shaft to drive a rotary rod to rotate, rotating a selection rod to drive a fixed rod to move, moving the fixed rod to drive a movable frame to swing, rotating a clamping device arranged on a sliding block to a proper position, clamping a main shaft to be replaced through the clamping device, starting the motor again, rotating the main shaft to the proper position, pushing equipment to a slicer needing to replace the main shaft, starting a lifting mechanism, lifting a base to a main shaft replacement position, pushing the sliding block, pushing the main shaft to be replaced, and installing the main shaft. The hydraulic cylinder and the hydraulic support are arranged for better adjusting the height of the bearing table, and the clamping device can be effectively prevented from turning over due to the fact that the weight of the main shaft is too heavy when the main shaft is clamped by the clamping device through the weight of the hydraulic cylinder.
The end part of the output shaft of the push rod motor is fixedly provided with a hinge part, and one end of the rotating rod is hinged with the hinge part. The rotating direction of the rotating rod can be effectively controlled in a hinged mode, and meanwhile, the fixing mode is firm.
The bearing table is fixedly provided with a plurality of guide rails, the guide rails are provided with clamping interfaces, the sliding block is fixedly provided with a plurality of fixing feet, the fixing feet are provided with clamping parts, and the clamping parts are clamped on the bearing table. The moving direction of the sliding block can be effectively limited in a clamping mode, and the sliding block can only move back and forth.
The guide rail on all set up a plurality of fixed orificess, the fixed foot on set up screw hole one, threaded connection has a nut on the screw hole one, the nut wears to establish on the screw hole, the nut can block into in the fixed orifices. When the clamping device is used for fixing the main shaft, the tail end of the nut is screwed into the fixing hole by screwing the nut, so that the sliding block is prevented from sliding on the bearing table. When the main shaft is required to be installed, the nut is unscrewed, so that the sliding block can be pushed, and the main shaft is conveniently installed on equipment.
Both ends of the guide rail are provided with limit buckles. The limiting buckle is arranged to prevent the sliding block from sliding off the bearing table, so that unnecessary loss is caused. And also to prevent carelessness of workers. The nut is not screwed, and the sliding block slides down to hurt workers.
The clamping device comprises an upper clamping block I, an upper clamping block II, a lower clamping block I, a lower clamping block II and a plurality of fixing screws, wherein the lower clamping block I and the lower clamping block II are fixedly arranged on the sliding block, and the lower clamping block I and the lower clamping block II are parallel to each other; the lower clamping block I and the lower clamping block II are symmetrically provided with threaded holes II, the upper clamping block I and the upper clamping block II are respectively provided with a through hole corresponding to the threaded holes II, and the fixing screw rod is arranged on the through holes in a penetrating manner and is in threaded connection with the threaded holes II; the end parts of the fixing screws are provided with plum blossom handles. And placing the main shaft in the middle of the upper clamping block I, the upper clamping block II, the lower clamping block I and the lower clamping block II, starting to screw the fixing screw, and fixing the main shaft.
The upper clamping block I, the upper clamping block II, the lower clamping block I and the lower clamping block II are all fixed with rubber pads. The main shaft is used as a relatively precise element and bears mechanical energy to normally operate, so that damage such as scratch and the like on the surface caused by repeated clamping of the clamp is prevented, and normal use of mechanical equipment is prevented from being influenced. The rubber pads are fixed on the upper clamping block I, the upper clamping block II, the lower clamping block I and the lower clamping block II, so that the situation can be effectively prevented, meanwhile, the friction force can be increased, and the main shaft is prevented from sliding off.
The lifting mechanism comprises a jack and a bottom plate, wherein the jack is provided with a bearing part, the bearing part is connected with the bottom of the base, and the bottom of the jack is connected with the bottom. The main shaft can be easily conveyed to the required height through the jack, and the jack is a common product which can be purchased in the market.
The lower part of the bottom plate is provided with a plurality of moving wheels. The movable wheels can facilitate the carrying of the main shaft by workers.
Compared with the prior art, the invention has the following advantages:
1. the clamping device can clamp the main shaft with any model size easily, the main shaft can be adjusted to a proper position through the push rod motor, and the main shaft can be adjusted to a proper height through the lifting mechanism, so that the main shaft is convenient to replace.
2. Through the joint setting of sliding block and plummer, the sliding block can be alone transport the main shaft forward, can fine main shaft transport to the department that needs to change.
3. The jack is installed on the lower portion of the base, so that a worker can easily adjust the main shaft to a proper height.
Drawings
Fig. 1 is a schematic diagram of a spindle changer for use on a high efficiency microtome.
In the figure, 1, a base; 2. a tilting fixing plate; 3. a bracket; 4. a movable frame; 5. a movable seat; 6. a push rod motor; 7. a fixed rod; 8. a rotating rod; 9. a pull rod; 10. a hydraulic cylinder; 11. a hydraulic support column; 12. a carrying platform; 13. a sliding block; 14. a guide rail; 15. a fixed foot; 16. a fixing hole; 17. a limit button; 18. an upper clamping block I; 19. an upper clamping block II; 20. a first lower clamping block; 21. a second lower clamping block; 22. a fixed screw; 23. a jack; 24. a bottom plate; 25. and (5) moving the wheel.
Description of the embodiments
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
The main shaft replacing device for the efficient slicing machine comprises a base 1 and is characterized in that an inclined fixing plate 2 is arranged on the base 1, and the inclined fixing plate 2 is fixed on the base 1 through a bracket 3; one side of the inclined fixed plate 2 is hinged with a movable frame 4, and the movable frame 4 is positioned at the lower part of the inclined fixed plate 2; the other side of the inclined fixed plate 2 is hinged with a movable seat 5, and the movable seat 5 is positioned at the high part of the inclined fixed plate 2; a push rod motor 6 is fixedly arranged on the movable seat 5; a fixed rod 7 is fixedly arranged in the middle of the inclined fixed plate 2, a rotary rod 8 is movably arranged at the upper part of the fixed rod 7, one end of the rotary rod 8 is connected with an output shaft of the push rod motor 6, and the other end of the rotary rod 8 is connected with the middle of the movable frame 4 through a pull rod 9; the base 1 is provided with a hydraulic cylinder 10, the movable frame 4 is provided with a hydraulic support column 11, the hydraulic cylinder 10 is connected with the hydraulic support column 11 through an oil pipe, the end part of the hydraulic support column 11 is fixedly provided with a bearing table 12, the bearing table 12 is movably provided with a sliding block 13, and the sliding block 13 is provided with a clamping device for clamping a main shaft; a lifting mechanism for lifting the base 1 up and down is also arranged below the base 1.
The end part of the output shaft of the push rod motor 6 is fixedly provided with a hinge part, and one end of the rotary rod 8 is hinged with the hinge part. The direction of rotation of the rotary rod 8 can be effectively controlled by means of hinging, and the fixing mode is firm.
The bearing table 12 is fixedly provided with a plurality of guide rails 14, the guide rails 14 are provided with clamping interfaces, the sliding block 13 is fixedly provided with a plurality of fixing legs 15, the fixing legs 15 are provided with clamping parts, and the clamping parts are clamped on the bearing table 12. The moving direction of the sliding block 13 can be effectively limited in a clamping manner, and the sliding block 13 can only move back and forth.
The guide rail 14 is provided with a plurality of fixing holes 16, the fixing leg 15 is provided with a first threaded hole, the first threaded hole is connected with a nut in a threaded manner, the nut is arranged on the threaded hole in a penetrating manner, and the nut can be clamped into the fixing holes 16. When the clamping device is used for fixing the main shaft, the tail end of the nut needs to be screwed into the fixing hole 16 by screwing the nut, so that the sliding block 13 is prevented from sliding on the bearing table 12. When the main shaft is required to be installed, the nut is unscrewed, the sliding block 13 can be pushed, and the main shaft is conveniently installed on equipment.
Both ends of the guide rail 14 are provided with limit buckles 17. The setting of the limit button 17 is to prevent the sliding block 13 from sliding off the carrying table 12, which causes unnecessary loss. And also to prevent carelessness of workers. Without tightening the nut, the slider 13 slides down to crush the worker.
The clamping device comprises an upper clamping block I18, an upper clamping block II 19, a lower clamping block I20, a lower clamping block II 21 and a plurality of fixing screws 22, wherein the lower clamping block I20 and the lower clamping block II 21 are fixedly arranged on the sliding block 13, and the lower clamping block I20 and the lower clamping block II 21 are parallel to each other; threaded holes II are symmetrically formed in the first lower clamping block 20 and the second lower clamping block 21, through holes corresponding to the threaded holes II are formed in the first upper clamping block 18 and the second upper clamping block 19, and a fixing screw 22 is arranged on the through holes in a penetrating mode and is connected to the threaded holes II in a threaded mode; the ends of the fixing screws 22 are provided with plum blossom handles. The main shaft is placed in the middle of the upper clamping block I18, the upper clamping block II 19, the lower clamping block I20 and the lower clamping block II 21, the fixing screw 22 starts to be screwed, and the main shaft is fixed.
Rubber pads are fixed on the first upper clamping block 18, the second upper clamping block 19, the first lower clamping block 20 and the second lower clamping block 21. The main shaft is used as a relatively precise element and bears mechanical energy to normally operate, so that damage such as scratch and the like on the surface caused by repeated clamping of the clamp is prevented, and normal use of mechanical equipment is prevented from being influenced. The upper clamping block I18, the upper clamping block II 19, the lower clamping block I20 and the lower clamping block II 21 are fixedly provided with rubber pads, so that the situation can be effectively prevented, and meanwhile, the friction force can be increased to prevent the main shaft from sliding off.
The lifting mechanism comprises a jack 23 and a bottom plate 24, the jack 23 is provided with a bearing part, the bearing part is connected with the bottom of the base 1, and the bottom of the jack 23 is connected with the bottom. The main shaft can be easily conveyed to a required height through the jack 23, and the jack 23 is a common product available in the market.
A plurality of moving wheels 25 are arranged at the lower part of the bottom plate 24. The movable wheel 25 is arranged to facilitate the carrying of the spindle by a worker.
The working principle of the invention is as follows: starting the push rod motor 6, starting parallel movement of an output shaft of the push rod motor 6, moving the output shaft to drive the rotary rod 8 to rotate, rotating the selection rod to drive the fixed rod 7 to move, moving the fixed rod 7 to drive the movable frame 4 to swing, rotating the clamping device arranged on the sliding block 13 to a proper position, clamping a spindle to be replaced through the clamping device, starting the motor again, rotating the spindle to a proper position, pushing equipment to a slicer needing spindle replacement, starting the lifting mechanism, lifting the base 1 to a spindle replacement position, pushing the sliding block 13, pushing the spindle to the replacement, and installing the spindle. The hydraulic cylinder 10 and the hydraulic support are arranged to better adjust the height of the bearing table 12, and the clamping device can be effectively prevented from turning over due to the fact that the weight of the main shaft is too heavy when the main shaft is clamped by the clamping device through the weight of the hydraulic cylinder 10.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although 1, base 1 are used more herein; 2. a tilt fixing plate 2; 3. a bracket 3; 4. a movable frame 4; 5. a movable seat 5; 6. a push rod motor 6; 7. a fixing rod 7; 8. a rotating rod 8; 9. a pull rod 9; 10. a hydraulic cylinder 10; 11. a hydraulic support column 11; 12. a carrying table 12; 13. a slider 13; 14. a guide rail 14; 15. a fixed leg 15; 16. a fixing hole 16; 17. a limit button 17; 18. an upper clamping block I18; 19. an upper clamping block II 19; 20. a first lower clamping block 20; 21. a second lower clamping block 21; 22. a fixing screw 22; 23. a jack 23; 24. a bottom plate 24; 25. the term moving wheel 25 is not exclusive of the possibility of using other terms. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (8)
1. The main shaft replacing device for the efficient slicing machine comprises a base, and is characterized in that an inclined fixing plate is arranged on the base and is fixed on the base through a bracket; one side of the inclined fixed plate is hinged with a movable frame, and the movable frame is positioned at the lower part of the inclined fixed plate; the other side of the inclined fixed plate is hinged with a movable seat, and the movable seat is positioned at the high part of the inclined fixed plate; a push rod motor is fixedly arranged on the movable seat; the middle part of the inclined fixing plate is fixedly provided with a fixing rod, the upper part of the fixing rod is movably provided with a rotating rod, one end of the rotating rod is connected with an output shaft of the push rod motor, and the other end of the rotating rod is connected with the middle part of the movable frame through a pull rod; the base is provided with a hydraulic cylinder, the movable frame is provided with a hydraulic support column, the hydraulic cylinder is connected with the hydraulic support column through an oil pipe, the end part of the hydraulic support column is fixedly provided with a bearing table, the bearing table is movably provided with a sliding block, and the sliding block is provided with a clamping device for clamping the main shaft; the lifting mechanism for lifting the base up and down is also arranged below the base.
2. The spindle changer for a high-efficiency slicer of claim 1, wherein the end of the output shaft of the push rod motor is fixedly provided with a hinge member, and one end of the rotary rod is hinged with the hinge member.
3. The spindle replacement device for a high-efficiency slicing machine according to claim 1, wherein the bearing table is fixedly provided with a plurality of guide rails, the guide rails are provided with clamping interfaces, the sliding block is fixedly provided with a plurality of fixing legs, the fixing legs are provided with clamping parts, and the clamping parts are clamped on the bearing table.
4. The spindle replacement apparatus for a high-efficiency slicer of claim 3 wherein the guide rail is provided with a plurality of fixing holes, the fixing legs are provided with threaded holes, the threaded holes are connected with nuts through threads, the nuts are arranged on the threaded holes in a penetrating manner, and the nuts can be clamped into the fixing holes.
5. The spindle replacement apparatus for a high efficiency slicer of claim 3, wherein the two ends of the guide rail are provided with limit buckles.
6. The spindle replacement device for the efficient slicer of claim 1, wherein the clamping device comprises an upper clamping block I, an upper clamping block II, a lower clamping block I, a lower clamping block II and a plurality of fixing screws, wherein the lower clamping block I and the lower clamping block II are fixedly arranged on the sliding block, and the lower clamping block I and the lower clamping block II are parallel to each other; the lower clamping block I and the lower clamping block II are symmetrically provided with threaded holes II, the upper clamping block I and the upper clamping block II are respectively provided with a through hole corresponding to the threaded holes II, and the fixing screw rod is arranged on the through holes in a penetrating manner and is in threaded connection with the threaded holes II; the end parts of the fixing screws are provided with plum blossom handles.
7. The spindle replacement apparatus for a high efficiency slicer of claim 6, wherein rubber pads are fixed to the first upper clamping block, the second upper clamping block, the first lower clamping block and the second lower clamping block.
8. The spindle replacement apparatus for a high efficiency slicer of claim 1, wherein the lifting mechanism comprises a jack and a bottom plate, the jack has a bearing portion, the bearing portion is connected to the bottom of the base, and the bottom of the jack is connected to the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710759253.0A CN107671582B (en) | 2017-08-29 | 2017-08-29 | Main shaft replacing device for efficient slicing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710759253.0A CN107671582B (en) | 2017-08-29 | 2017-08-29 | Main shaft replacing device for efficient slicing machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107671582A CN107671582A (en) | 2018-02-09 |
| CN107671582B true CN107671582B (en) | 2024-02-06 |
Family
ID=61134621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710759253.0A Active CN107671582B (en) | 2017-08-29 | 2017-08-29 | Main shaft replacing device for efficient slicing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107671582B (en) |
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| GB1117589A (en) * | 1966-06-06 | 1968-06-19 | Commissariat Energie Atomique | A support system for the installation and removal of objects connected to a support |
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| CN207155337U (en) * | 2017-08-29 | 2018-03-30 | 浙江昊能光电有限公司 | A kind of main shaft more changing device on efficient slicer |
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|---|---|---|---|---|
| US6829835B2 (en) * | 2002-11-21 | 2004-12-14 | Martin Pfeil Trawid-Gmbh | Lifting vehicle |
| FR2952922B1 (en) * | 2009-11-20 | 2012-05-25 | Snecma | HANDLING ASSEMBLY FOR AN AIRCRAFT ENGINE MODULE |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1117589A (en) * | 1966-06-06 | 1968-06-19 | Commissariat Energie Atomique | A support system for the installation and removal of objects connected to a support |
| EP1215119A1 (en) * | 2000-12-15 | 2002-06-19 | Bell Helicopter Textron Inc. | Six-axis alignment and installation tool |
| JP2006347424A (en) * | 2005-06-17 | 2006-12-28 | Nsk Ltd | Conveying truck |
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| CN201580565U (en) * | 2010-01-22 | 2010-09-15 | 顾祝平 | Platform vehicle for assembling and disassembling tail pipe nozzle of engine |
| KR20140003820U (en) * | 2012-12-12 | 2014-06-20 | 현대중공업 주식회사 | Apparatus for installing a pipe |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107671582A (en) | 2018-02-09 |
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