Large-bearing spring damping type inflation machine tool shock absorber welding device

Abstract

The invention relates to the technical field of shock absorber welding devices, in particular to a large-bearing spring damping type inflation machine tool shock absorber welding device which comprises a workbench, a side plate is arranged on one side of the workbench, a top plate is arranged on one side of the side plate, and a heat conduction assembly used for accelerating heat dissipation is arranged below the top plate. The heat conduction assembly comprises a cylinder, a plurality of hydraulic rods are arranged in the cylinder, the opposite ends of the multiple hydraulic rods penetrate and extend to the outer side of the cylinder and then are fixedly connected with limiting arc-shaped plates, and the multiple limiting arc-shaped plates form a circular ring to support and limit the inner side of the cylindrical workpiece; the semiconductor chilling plates on the inner sides of the limiting arc-shaped plates actively absorb heat on the inner side of a welding seam, then the heat is rapidly dissipated through the cooling fins, the temperature gradient on the inner side and the outer side of the welding seam can be reduced, temperature distribution is more uniform, the non-uniform degree of thermal stress is reduced, the deformation conditions such as roundness deviation of a weldment are effectively controlled, and the reject ratio is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorber welding devices, in particular to a large-load spring damping type pneumatic machine tool shock absorber welding device. Background Art

[0002] With the continuous development of the manufacturing industry, the requirements for machining accuracy and efficiency of machine tools are increasing. Machine tools will generate vibrations during operation, which seriously affects the machining accuracy and surface quality. Therefore, effective shock-absorbing devices are needed to reduce the impact of vibration. As a common shock-absorbing device, spring-damped pneumatic machine tool shock absorbers have been widely used in the field of machine tools because of their good shock-absorbing effect, large load-bearing capacity and ability to adapt to different working conditions. However, in the production and manufacturing process of such shock absorbers, welding is crucial. Traditional welding devices often face many problems when welding large-load spring-damped pneumatic machine tool shock absorbers.

[0003] When welding shock absorbers with existing welding devices, the circular weld between the base and the cylinder is a closed structure, which causes the outer surface of the circular weld to dissipate heat quickly and the inner surface to dissipate heat slowly, and heat accumulates on the inner side of the weld. This causes a large temperature gradient between the inside and outside of the weld, and the temperature difference further aggravates the uneven distribution of thermal stress. The uneven distribution of thermal stress will cause the base and the cylinder to expand and contract inconsistently at different locations during the welding process, resulting in deformation such as roundness deviation in the weld during the cooling process, resulting in a high weld defect rate. Summary of the invention

[0004] The object of the present invention is to provide a large-load spring damping pneumatic machine tool shock absorber welding device to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A large-load spring damping type pneumatic machine tool shock absorber welding device comprises a workbench, a side plate is provided on one side of the workbench, a top plate is provided on one side of the side plate, and a heat conduction component for accelerating heat dissipation is provided below the top plate; The heat conduction component includes a cylinder, and a plurality of hydraulic rods are arranged inside the cylinder. The opposite ends of the plurality of hydraulic rods extend through the outside of the cylinder and are fixedly connected with a limiting arc plate. The plurality of limiting arc plates form a circular ring shape to support and limit the inner side of the cylindrical workpiece. Semiconductor cooling plates are arranged on the inner sides of the plurality of limiting arc plates. A heat sink is arranged on the side of each semiconductor cooling plate away from the limiting arc plate, and the heat sink is used to accelerate the conduction of heat.

[0006] The semiconductor cooling plate on the inner side of the limit arc plate actively absorbs the heat inside the weld and then quickly dissipates it through the heat sink, which helps to reduce the temperature gradient inside and outside the weld and make the temperature distribution more uniform, thereby reducing the uneven degree of thermal stress, effectively controlling the deformation of the weldment such as roundness deviation, and reducing the defect rate. An inner cylinder is arranged inside the cylinder, and a plurality of connecting plates are fixedly connected between the cylinder and the inner cylinder. A strain sensor is arranged on one side of each limiting arc plate, and a thin-walled shell is sleeved on the outer wall of the strain sensor.

[0007] A first slide rail is arranged at one end of the side plate, a first sliding block is arranged on the outer wall of the first slide rail, and the top plate is fixedly connected to the first sliding block.

[0008] A connecting seat is fixedly connected to one side of the top plate, a motor is arranged on one side of the connecting seat, a connecting cylinder is rotatably connected inside the top plate, and an output end of the motor is fixedly connected to the connecting cylinder.

[0009] An air suction ring is provided on the outer wall of the connecting tube, a plurality of air suction holes are opened inside the air suction ring, a flexible connecting pipe is provided on the rear side of the air suction ring, the air suction ring and the flexible connecting pipe are connected by a rotating joint, a fan is provided on the end of the top plate away from the connecting tube, and one end of the flexible connecting pipe passes through the top plate and is connected with one end of the fan.

[0010] When heat is generated on the inner side of the cylindrical workpiece during welding, the fan starts to generate suction, and the heat conducted from the heat sink is sucked in through the multiple suction holes inside the suction ring, thereby preventing heat from accumulating in the welding area inside the cylindrical workpiece, reducing the temperature gradient inside and outside the weld, and further making the temperature distribution more uniform.

[0011] A fixing plate is fixedly connected to the rear side of the cylinder, and the fixing plate is connected to the connecting cylinder through a plurality of bolts.

[0012] The top of the workbench is fixedly connected to a base plate, and the sides of the base plate facing the top plate are fixedly connected to annular slide rails, the inner sides of the two annular slide rails are slidably connected to two second sliders, one end of each second slider is fixedly connected to the second slide rail, one end of each second slide rail is slidably connected to a third slider, one end of each third slider is fixedly connected to a clamping rod, and the two clamping rods are located on the outside of the limiting arc plate.

[0013] An extension plate is fixedly connected to the opposite side of each two second slide rails, and a docking rod is fixedly connected to one end of each extension plate. Cross slots are provided inside the two docking rods at the top, and cross plug blocks are fixedly connected to the tops of the two docking rods at the bottom. The two cross plug blocks are respectively engaged with the corresponding cross slots.

[0014] When the two workpieces are butted against each other, the cross slot of the top butt rod is engaged with the cross plug block at the bottom. After the engagement is completed, the two workpieces can be driven by a motor to rotate synchronously, so that the two workpieces can rotate at the same angular velocity and direction, ensuring uniform heating of the weld and uniform welding operation during the welding process.

[0015] A manipulator is provided at one end of the workbench, and the manipulator is used for loading and unloading welding workpieces. A controller is provided inside the inner cylinder, and the controller is electrically connected to the hydraulic rod and the strain sensor.

[0016] Two welding heads are arranged on the top of the workbench. The two welding heads are arranged obliquely and are respectively located on one side of the corresponding docking rod.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The present invention actively absorbs the heat inside the weld through the semiconductor refrigeration plate on the inner side of the limiting arc plate, and then quickly dissipates the heat through the heat sink, which helps to reduce the temperature gradient inside and outside the weld, making the temperature distribution more uniform, thereby reducing the unevenness of thermal stress, effectively controlling deformation such as roundness deviation of the weld, and reducing the defective rate.

[0018] The present invention provides a limiting arc plate, which, firstly, can fix the parts to be welded in the correct position to prevent the parts from moving or misaligning due to external force or vibration during the welding process; secondly, during welding, the cylindrical workpiece will be affected by high temperature and thermal stress. When the heat is concentrated in the weld area, without sufficient support, the cylindrical workpiece is prone to produce large thermal expansion locally. With the support of the limiting arc plate, this excessive expansion can be limited, thereby avoiding local excessive deformation. When deformation occurs, the limiting arc plate is driven by the hydraulic rod to apply an outward reverse force to the workpiece to correct it, thereby reducing waste and defective products caused by welding deformation and improving production stability and consistency.

[0019] When heat is generated on the inner side of the cylindrical workpiece during welding, the fan starts to generate suction, and the heat conducted from the heat sink is sucked in through the multiple suction holes inside the suction ring, thereby avoiding heat accumulation in the inner welding area of ​​the cylindrical workpiece, reducing the temperature gradient inside and outside the weld, and further making the temperature distribution more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 is a side view of the present invention; Figure 3 It is a schematic diagram of the connection structure between the first slide rail and the first slider of the present invention; Figure 4 It is a schematic diagram of the connection structure between the flexible connecting pipe and the rotary joint of the present invention; Figure 5 It is a schematic diagram of the connection structure between the hydraulic rod and the inner cylinder of the present invention; Figure 6 It is a schematic diagram of the connection structure between the semiconductor refrigeration sheet and the heat sink of the present invention; Figure 7 It is a schematic diagram of the connection structure between the top plate and the bottom of the present invention; Figure 8 It is a schematic diagram of the connection structure between the docking rod and the cross plug block of the present invention.

[0021] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. Workbench; 2. Side panel; 3. First slide rail; 4. Connecting seat; 5. Top plate; 6. Motor; 7. Connecting tube; 8. Bottom plate; 9. Manipulator; 10. First slider; 11. Welding head; 12. Annular slide rail; 13. Air suction ring; 14. Air suction hole; 15. Limiting arc plate; 16. Second slider; 17. Second slide rail; 18. Clamping rod; 19. Third slider; 20. Fan; 21. Flexible connecting pipe; 22. Rotary joint; 23. Fixed plate; 24. Cylinder; 25. Inner tube; 26. Hydraulic rod; 27. Strain sensor; 28. Connecting plate; 29. ​​Semiconductor refrigeration plate; 30. Heat sink; 31. Extension plate; 32. Docking rod; 33. Cross plug. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] like Figure 1-Figure 8 A large-load spring damping pneumatic machine tool shock absorber welding device shown includes a workbench 1, a side plate 2 is provided on one side of the workbench 1, a top plate 5 is provided on one side of the side plate 2, and a heat-conducting component for accelerating heat dissipation is provided below the top plate 5; The heat-conducting component includes a cylinder 24, and a plurality of hydraulic rods 26 are arranged inside the cylinder 24. The opposite ends of the plurality of hydraulic rods 26 extend through the outside of the cylinder 24 and are fixedly connected to a limiting arc plate 15. The plurality of limiting arc plates 15 form a circular ring shape to support and limit the inner side of the cylindrical workpiece. The inner sides of the plurality of limiting arc plates 15 are provided with semiconductor cooling plates 29. A heat sink 30 is arranged on the side of each semiconductor cooling plate 29 away from the limiting arc plate 15. The heat sink 30 is used to accelerate the conduction of heat.

[0024] During the welding process, when the base and the cylindrical workpiece (shock absorber accessory) need to be welded, the cylindrical workpiece is sleeved on the outer wall of multiple limiting arc plates 15. At this time, multiple hydraulic rods 26 are extended to make the limiting arc plates 15 contact and support the inner side of the cylindrical workpiece. The semiconductor refrigeration plate 29 works, and its cold surface absorbs the heat on the inner side of the cylindrical workpiece, and the hot surface transfers the heat to the heat sink 30. The heat sink 30 has a large surface area and good thermal conductivity, so it can quickly conduct the heat away, thereby accelerating the heat dissipation on the inner side of the cylindrical workpiece.

[0025] The semiconductor cooling plate 29 on the inner side of the limiting arc plate 15 actively absorbs the heat inside the weld and then quickly dissipates it through the heat sink 30, which helps to reduce the temperature gradient inside and outside the weld and make the temperature distribution more uniform, thereby reducing the unevenness of thermal stress. It can also reduce the accumulation of heat on the inside of the weld and reduce the inconsistency in the expansion and contraction of different parts of the base and the cylindrical workpiece caused by temperature differences, thereby effectively controlling deformation such as roundness deviation of the weld and ensuring the shape accuracy of the shock absorber.

[0026] At the same time, the limiting arc plate 15 can also achieve support limitation. Firstly, it can fix the parts to be welded in the correct position to prevent the parts from moving or misaligning due to external force or vibration during the welding process; secondly, during welding, the cylindrical workpiece will be affected by high temperature and thermal stress. When the heat is concentrated in the weld area, without sufficient support, the cylindrical workpiece is prone to large thermal expansion locally. With the support of the limiting arc plate 15, this excessive expansion can be limited, thereby avoiding local excessive deformation.

[0027] like Figure 3-Figure 6 As shown, an inner cylinder 25 is provided on the inner side of the cylinder 24, and a plurality of connecting plates 28 are fixedly connected between the cylinder 24 and the inner cylinder 25. A strain sensor 27 is provided on one side of each limiting arc plate 15, and a thin-walled shell is sleeved on the outer wall of the strain sensor 27. A manipulator 9 is provided at one end of the workbench 1, and the manipulator 9 is used for loading and unloading welding workpieces. A controller is provided inside the inner cylinder 25, and the controller is electrically connected to the hydraulic rod 26 and the strain sensor 27.

[0028] During the welding operation, the robot 9 loads the workpiece to be welded and places it on the workbench 1. When the welding generates thermal stress and deformation force (the cylindrical workpiece will shrink inward and the shrinkage size is uneven), the force is transmitted to the limiting arc plate 15. The strain sensor 27 on one side of the limiting arc plate 15 senses the strain and transmits the data to the controller inside the inner cylinder 25 through the line. The controller receives and processes the information from the strain sensor, and controls the hydraulic rod 26 to extend outward according to the preset program and algorithm, and applies an outward reverse force to the workpiece to correct it, thereby reducing waste and defective products caused by welding deformation and improving production stability and consistency.

[0029] The thin-walled shell is made of high-temperature resistant material, which can protect the strain sensor 27 from the impact of welding slag and the burning of high temperature.

[0030] The limiting arc plate 15 can be made of high-strength alloy steel.

[0031] like Figure 3-Figure 4 As shown, a first slide rail 3 is provided at one end of the side plate 2, a first slider 10 is provided on the outer wall of the first slide rail 3, a top plate 5 is fixedly connected to the first slider 10, a connecting seat 4 is fixedly connected to one side of the top plate 5, a motor 6 is provided on one side of the connecting seat 4, a connecting tube 7 is rotatably connected inside the top plate 5, an output end of the motor 6 is fixedly connected to the connecting tube 7, a fixing plate 23 is fixedly connected to the rear side of the cylinder 24, the fixing plate 23 and the connecting tube 7 are connected by a plurality of bolts, an air suction ring 13 is sleeved on the outer wall of the connecting tube 7, a plurality of air suction holes 14 are opened inside the air suction ring 13, a flexible connecting pipe 21 is provided on the rear side of the air suction ring 13, the air suction ring 13 and the flexible connecting pipe 21 are connected by a rotating joint 22, a fan 20 is provided at one end of the top plate 5 away from the connecting tube 7, and one end of the flexible connecting pipe 21 passes through the top plate 5 and is connected with one end of the fan 20.

[0032] When the motor 6 is working, its output end drives the connecting tube 7 to rotate. Since the fixing plate 23 is connected to the connecting tube 7 by bolts, the cylinder 24 is driven to rotate. When heat is generated on the inner side of the cylindrical workpiece during welding, the fan 20 starts to generate suction, and the heat conducted out of the heat sink 30 is sucked in through the multiple suction holes 14 inside the suction ring 13, thereby avoiding heat accumulation in the inner welding area of ​​the cylindrical workpiece, reducing the temperature gradient inside and outside the weld, and further making the temperature distribution more uniform.

[0033] The air suction ring 13 rotates with the rotation of the cylinder 24 , because the flexible connecting tube 21 is connected to the air suction ring 13 via the rotary joint 22 , so that the flexible connecting tube 21 will not interfere with the rotation of the air suction ring 13 with the cylinder 24 .

[0034] like Figure 7-Figure 8As shown, the top of the workbench 1 is fixedly connected with a base plate 8, and the side of the base plate 8 facing the top plate 5 is fixedly connected with an annular slide rail 12, and the inner sides of the two annular slide rails 12 are slidably connected with two second sliders 16, and one end of each second slider 16 is fixedly connected with a second slide rail 17, and one end of each second slide rail 17 is slidably connected with a third slider 19, and one end of each third slider 19 is fixedly connected with a clamping rod 18, wherein the two clamping rods 18 are located on the outside of the limiting arc plate 15, and the opposite side of each two second slide rails 17 is fixedly connected with an extension plate 31, and one end of each extension plate 31 is fixedly connected with a docking rod 32, and the two docking rods 32 at the top are provided with cross slots inside, and the tops of the two docking rods 32 at the bottom are fixedly connected with cross blocks 33, and the two cross blocks 33 are respectively clamped with the corresponding cross slots, and the top of the workbench 1 is provided with two welding heads 11, and the two welding heads 11 are inclined. The two welding heads 11 are respectively located on one side of the corresponding docking rods 32.

[0035] The base and cylindrical workpiece to be welded are placed between the two clamping rods 18 by the manipulator 9, and then the second slide rail 17 drives the clamping rod 18 to move so that the clamping rod 18 clamps the workpiece. After the clamping is completed, the first slide rail 3 drives the top plate 5 to move toward the bottom plate 8 to make the two workpieces contact. When the two workpieces are docked and contacted, the cross groove of the docking rod 32 on the top is clamped with the cross plug block 33 at the bottom. After the clamping is completed, the two workpieces can be driven to rotate synchronously by the motor 6.

[0036] Because the two welding heads 11 are arranged obliquely and are located on one side of the corresponding docking rod 32, during welding, the motor 6 drives the connecting tube 7 to rotate half a circle to realize the welding of the cylindrical workpiece and the base.

[0037] The annular slide rail 12 is provided with a friction groove (not shown) inside, which has a certain friction force. When the second slide block 16 is not subjected to external force, it will not move, and the friction force will not affect the welding process.

[0038] Working principle: First, the base workpiece to be welded is placed between the two clamping rods 18 of the bottom plate 8 by the manipulator 9, and then the second slide rail 17 drives the clamping rod 18 to move, so that the clamping rod 18 clamps the workpiece, and then the cylindrical workpiece is placed on the outside of the multiple limiting arc plates 15 by the manipulator 9. At this time, the limiting arc plates 15 contact and support the inner side of the cylindrical workpiece, and the outer wall of the cylindrical workpiece is clamped again by the clamping rod 18. After the clamping is completed, the first slide rail 3 drives the top plate 5 to move toward the bottom plate 8 to make the two workpieces contact. At this time, the cross groove of the top docking rod 32 is clamped with the cross plug block 33 of the bottom docking rod 32, which further enhances the stability of the clamping.

[0039] After the clamping is completed, the motor 6 is started, and its output end drives the connecting tube 7 to rotate. Since the fixing plate 23 is bolted to the connecting tube 7, the cylinder 24 is driven to rotate. At this time, the second slider 16 will also slide inside the annular slide rail 12. At this time, the workpiece is welded through the two welding heads 11. Since the two welding heads 11 are inclined and located on one side of the corresponding docking rod 32, the motor 6 drives the connecting tube 7 to rotate half a circle, and the comprehensive welding of the cylindrical workpiece and the base can be achieved.

[0040] During the welding process, the semiconductor refrigeration sheet 29 works to absorb the heat of the weld on the inner side of the cylindrical workpiece and quickly dissipates it through the heat sink 30. At the same time, the fan 20 is started to absorb the heat conducted by the heat sink 30 and the smoke generated by welding through the multiple suction holes 14 inside the suction ring 13, thereby avoiding the accumulation of heat and smoke in the welding area, reducing the temperature gradient inside and outside the weld, making the temperature distribution more uniform, and improving the working environment.

[0041] When welding generates thermal stress and deformation force, the force is transmitted to the limit arc plate 15, and the strain sensor 27 senses the strain and transmits the data to the controller inside the inner cylinder 25. The controller controls the hydraulic rod 26 to extend outward according to the preset program and algorithm, and applies an outward reverse force to the workpiece to correct the deformation, reduce waste and defective products, and improve the stability and consistency of production.

[0042] After welding is completed, each component returns to its initial state, and the robot 9 removes the welded workpiece, completing the entire welding process.

[0043] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-load spring damping type pneumatic machine tool shock absorber welding device, characterized in that: include: A workbench (1), wherein a side plate (2) is provided on one side of the workbench (1), a top plate (5) is provided on one side of the side plate (2), and a heat conduction component for accelerating heat dissipation is provided below the top plate (5); A heat conduction component comprises a cylinder (24), wherein a plurality of hydraulic rods (26) are arranged inside the cylinder (24), wherein opposite ends of the plurality of hydraulic rods (26) extend through the outside of the cylinder (24) and are fixedly connected to a limiting arc plate (15), wherein the plurality of limiting arc plates (15) form a circular ring shape to support and limit the inner side of a cylindrical workpiece, wherein the inner sides of the plurality of limiting arc plates (15) are provided with semiconductor cooling plates (29), and a heat sink (30) is arranged on a side of each semiconductor cooling plate (29) away from the limiting arc plate (15), wherein the heat sink (30) is used to accelerate heat conduction.

2. A large-load spring damping pneumatic machine tool shock absorber welding device according to claim 1, characterized in that: An inner cylinder (25) is provided on the inner side of the cylinder (24), a plurality of connecting plates (28) are fixedly connected between the cylinder (24) and the inner cylinder (25), a strain sensor (27) is provided on one side of each of the limiting arc plates (15), and the outer wall of each of the strain sensors (27) is sleeved with a thin-walled shell.

3. A large-load spring damping pneumatic machine tool shock absorber welding device according to claim 1, characterized in that: A first slide rail (3) is provided at one end of the side plate (2), a first slide block (10) is provided on the outer wall of the first slide rail (3), and the top plate (5) is fixedly connected to the first slide block (10).

4. A large-load spring damping pneumatic machine tool shock absorber welding device according to claim 1, characterized in that: A connecting seat (4) is fixedly connected to one side of the top plate (5), a motor (6) is provided on one side of the connecting seat (4), a connecting cylinder (7) is rotatably connected inside the top plate (5), and an output end of the motor (6) is fixedly connected to the connecting cylinder (7).

5. A large-load spring damping pneumatic machine tool shock absorber welding device according to claim 4, characterized in that: An air suction ring (13) is sleeved on the outer wall of the connecting tube (7), a plurality of air suction holes (14) are opened inside the air suction ring (13), a flexible connecting tube (21) is provided on the rear side of the air suction ring (13), the air suction ring (13) and the flexible connecting tube (21) are connected via a rotating joint (22), a fan (20) is provided at one end of the top plate (5) away from the connecting tube (7), and one end of the flexible connecting tube (21) passes through the top plate (5) and is connected to one end of the fan (20).

6. A large-load spring damping pneumatic machine tool shock absorber welding device according to claim 4, characterized in that: A fixing plate (23) is fixedly connected to the rear side of the cylinder (24), and the fixing plate (23) is connected to the connecting cylinder (7) via a plurality of bolts.

7. A large-load spring damping pneumatic machine tool shock absorber welding device according to claim 1, characterized in that: The top of the workbench (1) is fixedly connected to a bottom plate (8), and the sides of the bottom plate (8) facing the top plate (5) are fixedly connected to an annular slide rail (12), and the inner sides of the two annular slide rails (12) are slidably connected to two second sliders (16), one end of each of the second sliders (16) is fixedly connected to a second slide rail (17), one end of each of the second slide rails (17) is slidably connected to a third slider (19), and one end of each of the third sliders (19) is fixedly connected to a clamping rod (18), wherein two of the clamping rods (18) are located on the outside of the limiting arc plate (15).

8. A large-load spring damping pneumatic machine tool shock absorber welding device according to claim 7, characterized in that: An extension plate (31) is fixedly connected to one side opposite to each of the second slide rails (17); one end of each of the extension plates (31) is fixedly connected to a docking rod (32); a cross slot is provided inside the two docking rods (32) at the top; a cross plug block (33) is fixedly connected to the top of the two docking rods (32) at the bottom; the two cross plug blocks (33) are respectively engaged with the corresponding cross slots.

9. A large-load spring damping pneumatic machine tool shock absorber welding device according to claim 2, characterized in that: A manipulator (9) is provided at one end of the workbench (1), and the manipulator (9) is used for loading and unloading welding workpieces. A controller is provided inside the inner cylinder (25), and the controller is electrically connected to the hydraulic rod (26) and the strain sensor (27).

10. A large-load spring damping pneumatic machine tool shock absorber welding device according to claim 8, characterized in that: Two welding heads (11) are provided on the top of the workbench (1), the two welding heads (11) are arranged in an inclined manner, and the two welding heads (11) are respectively located on one side of a corresponding docking rod (32).

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