A transmission shaft clamping and welding integrated equipment

Abstract

The present invention relates to the technical field of transmission shaft welding, and in particular to an integrated transmission shaft clamping and welding device, comprising a workbench, a supporting unit, a clamping unit, a middle welding unit and an end welding unit; the present invention can solve the following problems existing in the prior art in the transmission shaft welding process: it is impossible to clamp and fix shafts of different diameters and perform welding processing, thereby failing to ensure stability when clamping shafts of different diameters; it is impossible to clamp and calibrate the joints of two shaft sections, thereby easily causing the axes of the two shaft sections to be unable to be concentric, and there is a bending angle between the two shaft sections, affecting the welding accuracy and effect; the present invention can provide all-round clamping and fixing for the transmission shaft to be welded, so that the two transmission shafts to be welded maintain the same axis, thereby calibrating them, and further improving the stability and welding accuracy of the transmission shaft; the present invention can clamp and fix transmission shafts of different diameters by adjusting the enclosed area between a plurality of limit columns.

Description

Technical Field

[0001] The invention relates to the technical field of transmission shaft welding, and in particular to integrated clamping and welding equipment for a transmission shaft. Background Art

[0002] The drive shaft is an important component for transmitting power in the automobile transmission system. It is used to transmit the power of the engine to the wheels, control the rotation of the vehicle, and enable the car to generate driving force. Some drive shafts need to be increased in length, so shaft sections of different lengths need to be welded. There are many different welding methods that can be used when welding the drive shaft, but it is necessary to ensure that the two sections of the drive shaft are on the same axis to ensure the effectiveness of the drive shaft.

[0003] However, there are usually some problems when welding the transmission shaft. With the development of science and technology, technical personnel in related fields have also carried out a lot of optimization on the welding of the transmission shaft. Among them, in order to make a more accurate comparison, a Chinese patent with publication number CN110202386A discloses a welding device for a transmission shaft, including a processing platform and a processing spindle. The mounting seat is arranged on the processing platform, and a mounting hole for installing the processing spindle is opened on the mounting seat. The processing spindle is rotatably arranged in the mounting hole through a bearing. The processing spindle is used to clamp the first axis to be processed, and the motor is also arranged in the mounting seat for driving the processing spindle to rotate; a positioning structure is arranged on the processing platform, and the positioning structure includes a positioning block, a movable block and a first cylinder. The positioning block is arranged on the front side of the processing spindle, and a first half hole arranged along the axial direction of the first axis to be processed is opened on the first side wall of the positioning block, and the movable block can slide back and forth relative to the positioning block, and a second half hole is opened on the side wall of the movable block close to the positioning block.

[0004] When the above-mentioned prior art is used, the first axis to be processed is first inserted into the processing spindle, and then the second axis to be processed is enclosed and clamped by the movable block and the positioning block, so that the second axis to be processed is located between the first half hole and the second half hole, and the ejection mechanism ejects the second axis to be processed and contacts the first axis to be processed; the rotation of the processing spindle drives the first axis to be processed to rotate at a high speed, so that the front end of the first axis to be processed and the second axis to be processed rub and are welded together; after welding is completed, the ejection mechanism cancels the force on the axis, the processing spindle continues to drive the axis to rotate, and the turning tool removes the solder.

[0005] However, there are still some shortcomings in the process of welding the transmission shaft in the above-mentioned prior art:

[0006] 1. Since different types of transmission shafts have different diameters, adaptive adjustment is required according to the diameter when clamping the transmission shaft. However, the first half hole and the second half hole provided by the above-mentioned prior art have fixed radii, and therefore cannot be adjusted according to the diameter of the shaft, thereby being unable to clamp and fix shafts of different diameters, and further making it difficult to perform corresponding welding processing on shafts of different diameters, so that the first half hole and the second half hole cannot clamp a shaft with a larger diameter, and the first half hole and the second half hole cannot ensure stability when clamping a shaft with a smaller diameter.

[0007] 2. In addition, because the above-mentioned prior art cannot clamp and calibrate the joints of the two shafts when they are joined, it is easy to cause the axes of the two shafts to be out of concentricity, and further makes it difficult to maintain the same axis after the two shafts are welded, that is, there is a bending angle between the two shafts, which affects the transmission effect.

[0008] Therefore, based on the above-stated viewpoints, there is still room for improvement in the existing transmission shaft welding methods. Summary of the invention

[0009] In order to solve the above problems, the present invention provides an integrated transmission shaft clamping and welding device, including a workbench, a support unit for supporting the transmission shaft to be welded, a clamping unit for limiting and fixing the transmission shaft to be welded, and a middle welding unit for welding two sections of the transmission shaft to be welded is arranged at the upper end of the workbench, the support unit includes a supporting frame installed in the middle of the upper end of the workbench, the clamping unit includes two control boxes slidably arranged at the upper end of the workbench and symmetrically arranged along the width direction thereof, a limiting column for clamping the transmission shaft to be welded is installed on the control box, and the middle welding unit includes a welding machine located above the workbench.

[0010] Preferably, the support unit further comprises a retractable spring rod, and both ends of the control box in the length direction are provided with a retractable spring rod, and the ends of the two retractable spring rods on the same side of the two control boxes are jointly installed with a pull plate;

[0011] The upper end of the pull plate is provided with a guide section inclined toward a side away from the control box, and a rubber pad is installed at the middle of a side of the pull plate close to the control box.

[0012] Preferably, the supporting frame consists of a bottom support frame, a vertical plate and a bearing plate, wherein a bottom support frame is installed in the middle of the upper end of the workbench, the length direction of the bottom support frame is parallel to the length direction of the workbench, and a plurality of equidistantly distributed vertical plates are arranged on the upper end of the bottom support frame along the width direction, the heights of the plurality of vertical plates gradually decrease from both sides to the middle of the bottom support frame, and a bearing plate is rotatably installed on the upper end of the vertical plates.

[0013] Preferably, the clamping unit further comprises two sliding grooves opened at the upper end of the workbench, the two sliding grooves are symmetrically arranged along the width direction of the workbench, a support block slidably arranged in the sliding groove is installed at the lower end of the control box, two bidirectional cylinders are symmetrically arranged inside the workbench along the length direction, the bidirectional cylinder is located between the two sliding grooves, and the two telescopic ends of the bidirectional cylinder are respectively connected to the support blocks opposite thereto;

[0014] The clamping unit also includes a positioning column installed inside the control box, and a plurality of execution groups are arranged equidistantly on the outer wall of the positioning column along the axial direction, and the execution group includes two support rods symmetrically distributed up and down along the axis of the positioning column, and a limit column is commonly arranged at the ends of the plurality of support rods on the same horizontal line on the positioning column, and a rubber roller is sleeved on the outer wall of the limit column, and the execution group also includes an angle adjustment component and a length adjustment component for adjusting the support rod, and a driving component is arranged on the outer wall of the control box.

[0015] Preferably, the support rod is rotatably sleeved on the outer wall of the positioning column, and the angle adjustment assembly includes a storage groove opened inside the support rod, a rotating ball is slidably arranged in the storage groove, a fixed plate is installed in the middle of the inner wall of the control box, and a double-headed screw is passed through the two rotating balls of the same execution group so as to rotate together. The double-headed screw rotates through the fixed plate, and the upper ends of multiple double-headed screws pass through the control box and are sleeved with belts.

[0016] Preferably, the length adjustment assembly includes a positioning plate, the support rod is a telescopic rod, two positioning plates are symmetrically arranged on the outer walls of the two fixed ends of the support rod, a return spring rod is arranged between the two positioning plates on the same side of the support rod, the positioning plates on the opposite sides of the two support rods of the same execution group are telescopic plates, and a force plate is hinged between the two positioning plates corresponding to the upper and lower positions.

[0017] Preferably, the length adjustment assembly further comprises a support, and the two opposite sides of the two force-bearing plates of the same execution group are both installed with supports, and the two sides of the control box in the length direction are both installed with mounting plates pointing to the middle of the workbench, and a rotating shaft is rotatably passed through the two mounting plates of the same control box, and the outer wall of the rotating shaft is sleeved with a plurality of rotating wheels that are rotatably opposed to the support, and the outer wall of the rotating wheel has two symmetrically distributed protrusions;

[0018] Both side walls of the control box in the length direction are rotatably provided with positioning shafts, and a fixed sleeve on the outer wall of the positioning shaft is provided with an operating handle, and the positioning shaft is connected with the rotating shaft through a belt transmission.

[0019] Preferably, the driving assembly includes a fixed shaft, and both side walls in the length direction of the control box are rotatably provided with fixed shafts, a first elastic belt is commonly sleeved between the two limit columns and the fixed shaft on the same control box, a tensioning shaft is rotatably installed on the outer wall of the control box and rests on the outer bending part of the first elastic belt, and a driving motor connected to any fixed shaft is provided on the outer wall of any control box through a motor seat.

[0020] Preferably, the drive assembly also includes a second elastic belt sleeved on the ends of the two limit columns located below, and a transition shaft is provided below the two limit columns located below the transmission shaft to be welded, which abuts against the inner bend of the second elastic belt. Both ends of the transition shaft are rotatably installed with a stabilizing plate connected to the upper end of the workbench, and an auxiliary shaft is also rotatably provided on the stabilizing plate, which abuts against the outer bend of the second elastic belt.

[0021] Preferably, the central welding unit also includes a stabilizing frame installed in the middle of the upper end of the workbench, a telescopic cylinder is installed in the middle of the upper end of the stabilizing frame, and a welding machine is arranged at the telescopic end of the bottom of the telescopic cylinder through a bearing plate, and the welding machine is located above the joint of the two transmission shafts to be welded.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. The present invention supports the transmission shaft to be welded upward by a support frame, and then applies a pushing force to the two transmission shafts to be welded at the same time by a pull plate, so that the two transmission shafts to be welded are brought close to one side of the middle part of the workbench and positioned, so that the butt joint of the two transmission shafts to be welded is located in the middle part of the workbench, and then the support rod and the limit column are driven by the control box to move to the side close to the transmission shaft to be welded, thereby providing all-round clamping and fixing for the transmission shaft to be welded, so that the two transmission shafts to be welded maintain the same axis, thereby calibrating them, and then the welding accuracy of the transmission shaft to be welded can be improved, and then the stability of the transmission shaft to be welded during the welding process can be ensured.

[0024] Second, the present invention can support the transmission shaft to be welded upwards through multiple bearing plates, thereby ensuring the stability of the transmission shaft to be welded. During this period, the bearing plates can rotate adaptively according to the bottom contour of the transmission shaft to be welded, and can adapt to transmission shafts of different diameters to improve the adaptability of the present invention.

[0025] 3. The present invention drives the rotating balls to move relative or opposite to each other by rotating the double-headed screw, and the rotating balls drive the limit posts to move synchronously through the support rods, thereby increasing or decreasing the enclosed area between the multiple limit posts, so as to facilitate clamping and fixing of transmission shafts to be welded with different diameters, thereby being able to adaptively adjust according to the diameter of the transmission shaft to be welded, thereby facilitating the welding of transmission shafts to be welded with different diameters.

[0026] Fourth, the present invention can increase or decrease the distance between the limit columns on both sides of the transmission shaft to be welded by adjusting the length of the support rod, thereby increasing or decreasing the enclosed area between multiple limit columns, so as to further clamp and fix transmission shafts of different diameters, thereby ensuring stable clamping of transmission shafts of various models.

[0027] 5. The present invention controls multiple limit columns to rotate synchronously with the same rotation direction, so that the limit columns drive the two transmission shafts to be welded to rotate through rubber rollers, so that the welding machine can perform rotation welding on them, thereby ensuring welding accuracy and welding strength without moving the welding machine.

[0028] 6. The present invention discharges air into the air groove through the air pump and discharges it through the through hole. When the airflow blows toward the welds of the two transmission shafts to be welded, it can cool them down, thereby accelerating the cooling and shaping of the welds and avoiding deformation of the joints when the transmission shafts to be welded are removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 It is a structural schematic diagram of the present invention.

[0031] Figure 2 It is a schematic diagram of the structure between the support unit and the control box of the present invention.

[0032] Figure 3 The present invention Figure 2 A partial enlarged view of point A.

[0033] Figure 4 It is a schematic diagram of the internal structure of the workbench of the present invention.

[0034] Figure 5 It is a structural schematic diagram of the clamping unit of the present invention.

[0035] Figure 6 It is a schematic diagram of the structure between the control box and the angle adjustment component of the present invention.

[0036] Figure 7 The present invention Figure 6 A partial enlarged view of point B.

[0037] Figure 8 It is a structural schematic diagram of the length adjustment component of the present invention.

[0038] Fig. 9 It is a schematic diagram of the structure between the angle adjustment component and the length adjustment component of the present invention.

[0039] Fig.10 It is a schematic diagram of the structure of the drive assembly of the present invention.

[0040] Fig.11 It is a schematic diagram of the structure between the control box, the limit column and the cooling unit of the present invention.

[0041] Fig.12 The present invention Fig.11 A partial enlarged view of point C.

[0042] Fig.13 It is a schematic diagram of the structure among the workbench, the middle welding unit and the end welding unit of the present invention.

[0043] Fig.14 It is a schematic structural diagram of the end welding unit of the present invention.

[0044] In the figure, 1, workbench; 2, support unit; 21, support frame; 211, bottom support frame; 212, vertical plate; 213, bearing plate; 22, contraction spring rod; 23, pull plate; 24, rubber pad; 3, clamping unit; 31, control box; 32, limit column; 33, sliding groove; 34, support block; 35, two-way cylinder; 36, positioning column; 37, support rod; 38, rubber roller; 39, angle adjustment component; 391, storage groove; 392, rotating ball; 393, fixing plate; 394, double-headed screw; 395, belt; 40, length adjustment component; 401, positioning plate; 402, reset spring rod; 403, force plate; 404, support; 405, mounting plate; 406, rotating shaft; 407, rotating wheel; 408, positioning shaft; 409 , operating handle; 41, driving assembly; 411, fixed shaft; 412, first elastic belt; 413, tensioning shaft; 414, driving motor; 415, second elastic belt; 416, transition shaft; 417, stabilizing plate; 418, auxiliary shaft; 5, middle welding unit; 51, welding machine; 52, stabilizing frame; 53, telescopic cylinder; 6, cooling unit; 61, sleeve; 62, air groove; 63, through hole; 64, air pump; 7, transmission shaft to be welded; 8, end welding unit; 81, assembly plate; 82, positioning base; 83, vertical support tube; 84, support positioning column; 85, stopper tensioning device; 86, mounting table; 87, clamping device; 88, chip blowing pump; 89, support plate; 90, rotating gear ring; 91, positioning motor; 92, transmission gear. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-Figure 14 Embodiments of the present invention are described in detail.

[0046] The embodiment of the present application discloses an integrated device for clamping and welding a transmission shaft. It should be noted that the integrated device for clamping and welding a transmission shaft of the present application is mainly used in the process of clamping, fixing and surrounding welding of the transmission shaft. In terms of technical effect, it can clamp and fix the transmission shaft 7 to be welded in all directions, so that the two transmission shafts 7 to be welded maintain the same axis, thereby improving the welding accuracy of the transmission shaft 7 to be welded, and further ensuring the stability of the transmission shaft 7 to be welded during the welding process; in particular, when clamping and fixing the transmission shaft 7 to be welded, it can support, push and enclose the clamp, thereby realizing multi-directional clamping of the transmission shaft 7 to be tested, and can clamp and weld the transmission shaft 7 to be welded of different diameters; further, the integrated device for clamping and welding a transmission shaft can also control the rotation of the transmission shaft 7 to be welded, so as to facilitate rotational welding thereof, thereby ensuring welding accuracy and welding strength.

[0047] Embodiment 1:

[0048] Reference Figure 1 As shown, an integrated transmission shaft clamping and welding device includes a workbench 1, and the upper end of the workbench 1 is provided with a support unit 2 for supporting the transmission shaft 7 to be welded, a clamping unit 3 for limiting and fixing the transmission shaft 7 to be welded, and a middle welding unit 5 for welding two sections of the transmission shaft 7 to be welded. The support unit 2 includes a supporting frame 21 installed in the middle of the upper end of the workbench 1, and the clamping unit 3 includes two control boxes 31 slidably arranged on the upper end of the workbench 1 and symmetrically arranged along the width direction thereof, and a limiting column 32 for clamping the transmission shaft 7 to be welded is installed on the control box 31.

[0049] During the specific implementation process, the two transmission shafts 7 to be welded are first placed on the support unit 2, so that the ends to be welded of the two transmission shafts are arranged relatively and abut against each other. Secondly, the two transmission shafts 7 to be welded are clamped and limited by the clamping unit 3, so that the two transmission shafts 7 to be welded are limited and fixed and are on the same axis. Then, the clamping unit 3 controls the two transmission shafts 7 to be welded to rotate synchronously, and cooperates with the middle welding unit 5 to weld the ends to be welded of the two transmission shafts 7 to be welded.

[0050] Reference Figure 2As shown, in order to ensure the welding effect between the two transmission shafts 7 to be welded, the two transmission shafts 7 to be welded need to be on the same axis and need to be kept fixed during the welding process. Based on this, a corresponding support unit 2 is provided in this embodiment. Specifically, the support unit 2 also includes a retractable spring rod 22, and retractable spring rods 22 are provided at both ends of the control box 31 in the length direction. A pull plate 23 is commonly installed at the ends of the two retractable spring rods 22 on the same side of the two control boxes 31; a pulling force is applied to the pull plate 23 by the retractable spring rod 22, so that the pull plate 23 always has a tendency to move toward the side of the control box 31, so that the distance between the two pull plates 23 is minimum in the initial state; the upper end of the pull plate 23 has a guide section inclined toward the side away from the control box 31, and a rubber pad 24 is installed in the middle of the side of the pull plate 23 close to the control box 31.

[0051] In the specific implementation process, when placing the two transmission shafts 7 to be welded on the support bracket 21, the guide section can guide the transmission shaft 7 to be welded so that it can be smoothly placed on the support bracket 21 and located between the two pull plates 23. Then, the end of the transmission shaft 7 to be welded abuts against the rubber pad 24. At this time, the pull plate 23 drives the rubber pad 24 to apply a pushing force to the transmission shaft 7 to be welded under the action of the contraction spring rod 22, so that the two transmission shafts 7 to be welded are moved to one side of the middle part of the workbench 1. Since the pushing forces on the two transmission shafts 7 to be welded are equal, the two transmission shafts 7 to be welded can be positioned so that the joint of the two transmission shafts 7 to be welded is located in the middle of the workbench 1, that is, the middle welding unit 5, so as to facilitate the welding process of the joint of the two transmission shafts 7 to be welded.

[0052] Reference Figure 3 As shown, since the transmission shaft is cylindrical and its outer circumference is smooth and easy to roll, in order to facilitate the placement of the transmission shaft 7 to be welded on the support frame 21 so that it will not roll off at will, the support frame 21 is further improved in this embodiment. Specifically, the support frame 21 is composed of a bottom support frame 211, a vertical plate 212 and a bearing plate 213, wherein a bottom support frame 211 is installed in the middle of the upper end of the workbench 1, and the length direction of the bottom support frame 211 is parallel to the length direction of the workbench 1, and a plurality of equidistantly distributed vertical plates 212 are arranged on the upper end of the bottom support frame 211 along the width direction, and the heights of the plurality of vertical plates 212 gradually decrease from both sides to the middle of the bottom support frame 211, so that the upper ends of the plurality of vertical plates 212 form an arc shape together, and the upper ends of the vertical plates 212 are rotatably installed with a bearing plate 213.

[0053] During the specific implementation process, when the transmission shaft 7 to be welded is placed on the support bracket 21, the transmission shaft 7 to be welded first rests on a plurality of supporting plates 213, and the plurality of supporting plates 213 adaptively rotate according to the bottom contour of the transmission shaft 7 to be welded. The plurality of supporting plates 213 can support the transmission shaft 7 to be welded upward, thereby ensuring the stability of the transmission shaft 7 to be welded, so as to facilitate the subsequent clamping and fixing thereof; in addition, the supporting plates 213 can adaptively rotate according to the outer contour of the transmission shaft, so as to adapt to transmission shafts of different diameters, so as to improve the adaptability of the present invention.

[0054] Reference Figure 4 , Figure 5 and Figure 6 As shown, in order to further ensure the stability of the transmission shaft 7 to be welded during the welding process, in this embodiment, the transmission shaft 7 to be welded can be further clamped and limited on the basis of being pushed and supported. Based on this, a corresponding clamping unit 3 is provided in this embodiment. Specifically, the clamping unit 3 also includes two sliding grooves 33 opened at the upper end of the workbench 1, and the two sliding grooves 33 are symmetrically arranged along the width direction of the workbench 1. A support block 34 slidingly arranged in the sliding groove 33 is installed at the lower end of the control box 31. Two two-way cylinders 35 are symmetrically arranged inside the workbench 1 along the length direction. The two-way cylinder 35 is located between the two sliding grooves 33, and the two telescopic ends of the two-way cylinder 35 are respectively connected to the support blocks 34 opposite to it; the workbench 1 is a multi-section splicing structure to facilitate the installation and disassembly of the two-way cylinder 35.

[0055] Furthermore, in this embodiment, the clamping unit 3 also includes a positioning column 36 installed inside the control box 31, and a plurality of execution groups are equidistantly arranged on the outer wall of the positioning column 36 along the axial direction, and the execution group includes two support rods 37 symmetrically distributed up and down along the axis of the positioning column 36, and a limiting column 32 is commonly arranged at the ends of the plurality of support rods 37 on the same horizontal line on the positioning column 36, and a rubber roller 38 is fixedly sleeved on the outer wall of the limiting column 32, and the execution group also includes an angle adjustment component 39 and a length adjustment component 40 for adjusting the support rod 37, and a driving component 41 is arranged on the outer wall of the control box 31.

[0056] In the initial state, the support block 34 is located at a side of the sliding groove 33 away from the middle of the workbench 1 , that is, the distance between the two control boxes 31 is the largest, so as to facilitate the placement of the transmission shaft 7 to be welded.

[0057] It should be noted that the rubber roller 38 can increase the friction between the transmission shaft 7 to be welded, so that when the driving component 41 drives the limiting column 32 to rotate, the rubber roller 38 drives the transmission shaft 7 to be welded to rotate.

[0058] During the specific implementation process, after the placement of the transmission shaft 7 to be welded is completed, the two-way cylinder 35 is started, and the two-way cylinder 35 drives the two support blocks 34 to move relative to each other, and the support blocks 34 drive the control box 31, the positioning column 36, the support rod 37 and the limit column 32 to move synchronously as a whole, so that both sides of the transmission shaft 7 to be welded are affected by the resistance effect of the limit column 32, so that the two transmission shafts 7 to be welded can be further clamped and fixed on the basis of being supported and pushed, so as to ensure the stability of the transmission shaft 7 to be welded during the welding process; in addition, through the multiple limit columns 32 on both sides of the transmission shaft 7 to be welded, the two transmission shafts 7 to be welded can also be clamped and fixed in all directions, so that the two transmission shafts 7 to be welded maintain the same axis, so as to calibrate them, thereby improving the welding accuracy of the transmission shaft 7 to be welded.

[0059] After the transmission shaft is welded, the bidirectional cylinder 35 drives the two support blocks 34 to move in opposite directions, and the support blocks 34 drive the control box 31 and the limit column 32 to move synchronously and release the clamping effect on the transmission shaft 7 to be welded, so as to remove the welded transmission shaft.

[0060] Reference Figure 7 As shown, since the diameters of drive shafts of different models are different, it is necessary to support and fix the drive shafts of different diameters. Based on this, it is necessary to adjust the angle between the support rods 37 on the upper and lower sides of the outer wall of the positioning column 36 accordingly. Specifically, an angle adjustment component 39 is also provided in this embodiment. The support rod 37 is rotatably sleeved on the outer wall of the positioning column 36. The angle adjustment component 39 includes a storage groove 391 opened inside the support rod 37, and a rotating ball 392 is slidably arranged in the storage groove 391. A fixing plate 393 is installed in the middle of the inner wall of the control box 31. A double-headed screw 394 is inserted through the two rotating balls 392 of the same execution group so as to rotate together. The double-headed screw 394 rotates through the fixing plate 393, and the upper ends of multiple double-headed screws 394 pass through the control box 31 and are sleeved with belts 395.

[0061] During the specific implementation process, any double-headed screw 394 is rotated, and the double-headed screw 394 drives the other double-headed screws 394 to rotate synchronously through the belt 395. When the double-headed screw 394 rotates, it drives the rotating ball 392 to move relative to or away from each other, so that the rotating ball 392 drives the support rod 37 of its outer wall to swing accordingly, thereby controlling the support rods 37 on the upper and lower sides of the positioning column 36 to swing relative to or away from each other to adjust the angle of the support rod 37, and then the support rod 37 drives the limit column 32 to move synchronously, thereby increasing or decreasing the enclosed area between multiple limit columns 32, so as to facilitate the clamping and fixing of the transmission shafts 7 to be welded with different diameters, so that it can be adaptively adjusted according to the diameter of the transmission shaft 7 to be welded, and thus facilitate the welding of the transmission shafts 7 to be welded with different diameters.

[0062] It should be noted that the length of the storage groove 391 is greater than the diameter of the rotating ball 392. Therefore, when the double-headed screw 394 is rotated to control the movement of the rotating ball 392, the rotating ball 392 can adaptively slide in the storage groove 391 to avoid interference. In addition, the rotating ball 392 can only slide in the storage groove 391 and cannot rotate. Therefore, when the double-headed screw 394 rotates, it rotates relative to the rotating ball 392.

[0063] Reference Figure 8 and Fig. 9 As shown, when the transmission shaft still cannot be clamped and fixed after adjusting the angle of the support rod 37, that is, the limit column 32 after adjustment is not in the specified position of the outer wall of the transmission shaft 7 to be welded, and therefore it cannot be stably clamped, so it needs to be further adjusted according to the diameter of the transmission shaft. Based on this, a length adjustment component 40 is provided in this embodiment. Specifically, the length adjustment component 40 includes a positioning plate 401, and the support rod 37 is a telescopic rod. Two positioning plates 401 are symmetrically arranged on the outer walls of the two fixed ends of the support rod 37, and a return spring rod 402 is arranged between the two positioning plates 401 on the same side of the support rod 37. The positioning plates 401 on the opposite sides of the two support rods 37 of the same execution group are telescopic plates, which can be adaptively telescoped when the length of the support rod 37 is adjusted without causing interference, and a force plate 403 is hinged between the two positioning plates 401 corresponding to the upper and lower positions.

[0064] Furthermore, in this embodiment, the length adjustment component 40 also includes a support 404, and the supports 404 are installed on the opposite sides of the two force-bearing plates 403 of the same execution group, and mounting plates 405 pointing to the middle side of the workbench 1 are installed on both sides of the length direction of the control box 31. A rotating shaft 406 is rotatably passed through the two mounting plates 405 of the same control box 31, and the outer wall of the rotating shaft 406 is sleeved with a plurality of rotating wheels 407 that are rotatably opposed to the support 404, and the outer wall of the rotating wheel 407 has two symmetrically distributed protrusions; the two side walls in the length direction of the control box 31 are rotatably provided with positioning shafts 408, and the outer wall of the positioning shaft 408 is fixedly sleeved with an operating handle 409, and the positioning shaft 408 is connected to the rotating shaft 406 by a belt drive.

[0065] In the initial state, the return spring rod 402 applies a contraction pulling force to the support rod 37, so that the support rod 37 always has a tendency to retract when not affected by other external forces, so that the support rod 37 is contracted to the shortest in the initial state. At this time, the distance between the two force-bearing plates 403 of the same execution group is the smallest, and there is no contact between the raised portion of the rotating wheel 407 and the support 404 and they are staggered with each other; at this time, the enclosed area between the multiple limit columns 32 is the largest, which is suitable for clamping and fixing a transmission shaft with a relatively large diameter.

[0066] During the specific implementation process, the positioning shaft 408 is rotated by operating the handle 409, and the positioning shaft 408 drives the rotating shaft 406 and the rotating wheel 407 to rotate synchronously. When the protrusion of the rotating wheel 407 comes into contact with the support 404, the support 404 is subjected to the top contact force and cooperates with the force plate 403 to drive the two fixed ends of the support rod 37 to move away from each other, thereby extending the length of the support rod 37, so as to reduce the distance between the limit columns 32 on both sides of the transmission shaft 7 to be welded, and then reduce the enclosed area between the multiple limit columns 32, so as to clamp and fix the transmission shaft with relatively small diameter, so that the enclosed area between the multiple limit columns 32 can be further adjusted by adjusting the length of the support rod 37, thereby ensuring stable clamping of transmission shafts of various models.

[0067] It should be noted that a damping (not shown in the figure) is arranged between the positioning shaft 408 and the control box 31. The damping can limit the positioning shaft 408 so that the positioning shaft 408 will only rotate when it is subjected to a driving force greater than the damping effect, thereby ensuring that the positioning shaft 408 and the rotation remain fixed at all times when not affected by other external forces, thereby avoiding changing the length of the support rod 37 and affecting the stability of the transmission shaft 7 to be welded.

[0068] Reference Fig.10 As shown, in order to ensure that the joints of the two transmission shafts 7 to be welded are firmly welded, rotational welding is required. Based on this, a drive assembly 41 is also provided in this embodiment. Specifically, the drive assembly 41 includes a fixed shaft 411. The two side walls of the control box 31 in the length direction are rotatably provided with fixed shafts 411. A first elastic belt 412 is commonly sleeved between the two limit columns 32 and the fixed shaft 411 on the same control box 31. A tensioning shaft 413 is rotatably installed on the outer wall of the control box 31, which rests against the outer bend of the first elastic belt 412. A drive motor 414 connected to any fixed shaft 411 is provided on the outer wall of any control box 31 through a motor seat.

[0069] Furthermore, in this embodiment, the driving assembly 41 also includes a second elastic belt 415 that is sleeved on the ends of the two limiting columns 32 located below, and a transition shaft 416 that rests against the inner bend of the second elastic belt 415 is provided below the two limiting columns 32 located below the transmission shaft 7 to be welded, and both ends of the transition shaft 416 are rotatably installed with a stabilizing plate 417 connected to the upper end of the workbench 1, and an auxiliary shaft 418 that rests against the outer bend of the second elastic belt 415 is also rotatably provided on the stabilizing plate 417.

[0070] During the specific implementation process, after the transmission shaft 7 to be welded is clamped and fixed, the driving motor 414 is started, and the driving motor 414 drives the fixed shaft 411 to rotate, and the fixed shaft 411 drives the limiting column 32 to rotate synchronously through the first elastic belt 412; at the same time, the limiting column 32 drives the limiting column 32 on the other side to rotate synchronously through the second elastic belt 415, and the limiting columns 32 on both sides of the transmission shaft 7 to be welded have the same rotation direction, so that the limiting column 32 can drive the two transmission shafts 7 to be welded to rotate through the rubber roller 38, so as to facilitate rotational welding thereof, which can ensure welding accuracy and welding strength, and there is no need to move the welding machine 51.

[0071] It should be noted that the fixed shaft 411, the limiting column 32 and the transition shaft 416 are initially stationary and rotate only after the angle or length of the support rod 37 is adjusted, so that the transmission failure of the first elastic belt 412 and the second elastic belt 415 will not occur.

[0072] Reference Figure 1 As shown, in order to facilitate the corresponding welding process of the transmission shaft 7 to be welded, in this embodiment, the middle welding unit 5 also includes a stabilizing frame 52 installed in the middle of the upper end of the workbench 1, and a telescopic cylinder 53 is installed in the middle of the upper end of the stabilizing frame 52. The telescopic end at the bottom of the telescopic cylinder 53 is provided with a welding machine 51 through a supporting plate 213, and the welding machine 51 is located above the joint of the two transmission shafts 7 to be welded.

[0073] In the specific implementation process, after the two transmission shafts 7 to be welded are placed and clamped, the two transmission shafts 7 to be welded are controlled to rotate synchronously through the driving component 41, and then the telescopic cylinder 53 is started, and the telescopic cylinder 53 drives the welder 51 to move downward, so that the welder 51 is located above the joint of the two transmission shafts 7 to be welded, and then the welder 51 is started to weld the joint of the two transmission shafts 7 to be welded; during this period, the rotation of the transmission shaft 7 to be welded can obtain rotational welding, thereby improving the welding accuracy and welding strength.

[0074] Embodiment 2:

[0075] Reference Fig.11 and Fig.12As shown, on the basis of the first embodiment, in order to prevent the deformation of the joint due to the complete solidification of the weld during the removal of the two transmission shafts 7 to be welded, the weld after welding can be cooled and shaped accordingly in this embodiment. Based on this, a cooling unit 6 is also provided in this embodiment. Specifically, the cooling unit 6 includes a collar 61. The upper support rod 37 of the execution group in the middle of the workbench 1 is installed with a collar 61 rotatably sleeved on the outside of the limiting column 32 at one end away from the positioning column 36, that is, the collar 61 is located at the joint of the two transmission shafts 7 to be welded, and the diameter of the collar 61 is smaller than the diameter of the rubber roller 38. Therefore, when the rubber roller 38 conflicts with the transmission shaft 7 to be welded, the collar 61 will not contact the transmission shaft 7 to be welded.

[0076] Furthermore, in the present embodiment, an air groove 62 is provided on the side of the ring 61 away from the support rod 37, and a plurality of through holes 63 are provided on the inner wall of the air groove 62 which are evenly distributed and connected to the outside world. An air pump 64 is installed in the middle of the upper end of the control box 31, and the air inlet end of the air pump 64 is connected to the outside world, and the air outlet end of the air pump 64 is connected to the air groove 62 through a connecting pipe.

[0077] During the specific implementation process, the air pump 64 is started to transport air into the air groove 62, so that the air in the air groove 62 is discharged through the through hole 63. When the airflow blows towards the welds of the two transmission shafts 7 to be welded, it can cool them down, thereby accelerating the cooling and shaping of the welds and avoiding deformation at the joint when the transmission shaft 7 to be welded is removed.

[0078] Embodiment three:

[0079] Reference Fig.13 and Fig.14 As shown, on the basis of the first embodiment, different types of transmission shafts 7 to be welded need to adopt different welding methods, that is, two sections of transmission shafts 7 to be welded need to be welded at the butt joint, and some transmission shafts 7 to be welded need to be welded at the end. Based on this, a corresponding end welding unit 8 is also provided in this embodiment. Specifically, the end welding unit 8 includes an assembly plate 81 mounted on the upper end of the workbench 1 in a detachable manner, a positioning base 82 is provided on the upper end of the assembly plate 81, a vertical support tube 83 is provided on the upper end of the positioning base 82, a support positioning column 84 extending inside the vertical support tube 83 is provided on the upper end of the positioning base 82, the upper end of the support positioning column 84 is a horizontal positioning surface, and a stop tensioning device 85 for abutting against the outer wall of the transmission shaft 7 to be welded is installed on the inner wall of the vertical support tube 83, two mounting platforms 86 are symmetrically provided along the positioning base 82 on the upper end of the assembly plate 81, a clamping device 87 is provided on the upper end of the mounting platform 86, and chip blowing pumps 88 are provided on both sides of the mounting platform 86 on the same side of the positioning base 82 through a fixed frame.

[0080] Furthermore, in this embodiment, two support plates 89 are symmetrically arranged along the positioning base 82 at the upper end of the assembly plate 81, the stabilizing frame 52 is an inverted U-shape, and the two sides of the lower end of the stabilizing frame 52 are rotatably connected to the two support plates 89 through pins; the stabilizing frame 52 and the lower ends of the support plates 89 are jointly provided with a rotating ring gear 90, and the rotating ring gear 90 is rotatably arranged on the upper end of the assembly plate 81, and a positioning motor 91 is installed on the upper end of the assembly plate 81 through a motor cover, and the outer wall of the output shaft of the lower end of the positioning motor 91 is provided with a transmission gear 92 meshing with the rotating ring gear 90.

[0081] It should be noted that the supporting unit 2 , the clamping unit 3 and the middle welding unit 5 are all detachably mounted on the upper end of the workbench 1 .

[0082] During the specific implementation process, the support unit 2, the clamping unit 3 and the middle welding unit 5 are first removed from the workbench 1, and then the assembly plate 81 is installed on the workbench 1. Next, the stabilizing frame 52 is rotated, and the stabilizing frame 52 drives the telescopic cylinder 53 and the welding machine 51 to move downward circumferentially along the pin axis to the specified position; then the transmission shaft 7 to be welded is inserted into the vertical support tube 83. During this period, the transmission shaft 7 to be welded can be supported by the supporting positioning surface, and the verticality of the transmission shaft 7 to be welded during the welding process can be ensured. At the same time, the transmission shaft 7 to be welded can be positioned through the inner stop by the stop tensioning device 85 to ensure the position of the transmission shaft 7 to be welded during the welding process, and the transmission shafts 7 to be welded with different diameters can be positioned.

[0083] After the positioning of the transmission shaft 7 to be welded is completed, it is pressed down and further limited and fixed by the clamping device 87, and then the positioning motor 91 is started, and the positioning motor 91 drives the transmission gear 92 to rotate, and the transmission gear 92 drives the stabilizing frame 52, the telescopic cylinder 53 and the welding machine 51 to move synchronously circumferentially as a whole through the rotating ring gear 90. During this period, the telescopic cylinder 53 is started, and the telescopic cylinder 53 drives the welding machine 51 to move to the welding position of the transmission shaft 7 to be welded, and then the welding machine 51 is started. The end of the transmission shaft 7 to be welded can be welded by the welding machine 51; after the welding is completed, the transmission shaft 7 to be welded is taken out from the vertical support tube 83. At this time, the chip blowing pump 88 is started to blow away the impurities and debris inside the vertical support tube 83 to prevent the debris from remaining on the support positioning surface and affecting the verticality and position of the next transmission shaft 7 to be welded and the welding effect.

[0084] It should be noted that a plurality of annularly distributed limiting convex strips are provided between the stabilizing frame 52 and the supporting plate 89 (in Fig.13As shown in the figure, the relative rotation between the stabilizing frame 52 and the support plate 89 can be limited by the limiting convex strip to prevent the stabilizing frame 52 from rotating along the pin shaft at will. Only when the driving force applied to the stabilizing frame 52 is greater than the limiting force applied by the limiting convex strip, the stabilizing frame 52 can rotate downward relative to the support plate 89, thereby ensuring the stability of the telescopic cylinder 53 and the welding machine 51 on the stabilizing frame 52 to ensure that they are at a specified angle.

[0085] During work: Step 1: First, place the two transmission shafts 7 to be welded on the support bracket 21, and then the ends of the transmission shafts 7 to be welded are abutted against the rubber pads 24. The pull plate 23 drives the rubber pads 24 to apply a pushing force to the transmission shafts 7 to be welded under the action of the contraction spring rod 22, so that the butt joint of the two transmission shafts 7 to be welded is located in the middle of the workbench 1, that is, below the welding machine 51.

[0086] The second step: rotate the double-headed screw 394. When the double-headed screw 394 rotates, it drives the rotating ball 392 to move relative to or away from each other, so that the rotating ball 392 drives the support rod 37 on its outer wall to swing accordingly to adjust the angle of the support rod 37, and then the support rod 37 drives the limit column 32 to move synchronously, so as to increase or decrease the enclosed area between the multiple limit columns 32, so as to facilitate the clamping and fixation of the transmission shaft 7 to be welded with different diameters, so that it can be adaptively adjusted according to the diameter of the transmission shaft 7 to be welded.

[0087] Step 3: Rotate the positioning shaft 408, and the positioning shaft 408 drives the rotating shaft 406 and the rotating wheel 407 to rotate synchronously. When the raised portion of the rotating wheel 407 contacts the support 404, the support 404 is subjected to the top contact force and cooperates with the force plate 403 to drive the two fixed ends of the support rod 37 to move away from each other, thereby extending the length of the support rod 37, so as to reduce the distance between the limiting columns 32 on both sides of the transmission shaft 7 to be welded, and then reduce the enclosed area between the multiple limiting columns 32, so as to clamp and fix the transmission shaft with a relatively small diameter, so that the enclosed area between the multiple limiting columns 32 can be further adjusted by adjusting the length of the support rod 37, thereby ensuring stable clamping of transmission shafts of various models.

[0088] Step 4: After the placement of the transmission shaft 7 to be welded is completed, start the two-way cylinder 35, which drives the two support blocks 34 to move relative to each other, and the support blocks 34 drive the control box 31, the positioning column 36, the support rod 37 and the limit column 32 to move synchronously as a whole, so that both sides of the transmission shaft 7 to be welded are affected by the interference effect of the limit column 32, thereby providing all-round clamping and fixing for the two transmission shafts 7 to be welded, so that the two transmission shafts 7 to be welded maintain the same axis, thereby calibrating them, and then the welding accuracy of the transmission shaft 7 to be welded can be improved.

[0089] Step 5: Start the driving motor 414, the driving motor 414 drives the fixed shaft 411 to rotate, and the fixed shaft 411 drives the limiting column 32 to rotate synchronously through the first elastic belt 412; at the same time, the limiting column 32 drives the limiting column 32 on the other side to rotate synchronously through the second elastic belt 415, and the limiting columns 32 on both sides of the transmission shaft 7 to be welded have the same rotation direction, so that the limiting column 32 can drive the two transmission shafts 7 to be welded to rotate through the rubber roller 38.

[0090] Step 6: Start the telescopic cylinder 53, which drives the welder 51 to move downward so that the welder 51 is located above the butt joint of the two transmission shafts 7 to be welded. Then start the welder 51 to weld the butt joint of the two transmission shafts 7 to be welded. During this period, the transmission shafts 7 to be welded rotate to obtain rotational welding, thereby improving welding accuracy and welding strength.

[0091] Step 7: Start the air pump 64, which delivers air to the air groove 62, so that the air in the air groove 62 is discharged through the through hole 63. When the airflow blows toward the welds of the two transmission shafts 7 to be welded, it can cool them down, thereby accelerating the cooling and shaping of the welds, and avoiding deformation at the joint when the transmission shaft 7 to be welded is removed.

[0092] Step 8: After the transmission shaft is welded, the bidirectional cylinder 35 drives the two support blocks 34 to move in opposite directions, and the support blocks 34 drive the control box 31 and the limit column 32 to move synchronously and release the clamping effect on the transmission shaft 7 to be welded, so as to remove the welded transmission shaft.

[0093] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention.

[0094] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A transmission shaft clamping and welding integrated device, comprising a workbench (1), wherein the upper end of the workbench (1) is provided with a support unit (2) for supporting a transmission shaft (7) to be welded, a clamping unit (3) for limiting and fixing the transmission shaft (7) to be welded, and a middle welding unit (5) for welding two sections of the transmission shaft (7) to be welded, wherein: The support unit (2) comprises a support bracket (21) mounted at the middle of the upper end of the workbench (1); the clamping unit (3) comprises two control boxes (31) slidably arranged at the upper end of the workbench (1) and symmetrically arranged along the width direction thereof; a limit column (32) for clamping the transmission shaft (7) to be welded is mounted on the control box (31); the middle welding unit (5) comprises a welding machine (51) located above the workbench (1), and also comprises an end welding unit (8) for welding the end of the transmission shaft (7) to be welded; The clamping unit (3) further comprises two sliding grooves (33) provided at the upper end of the workbench (1), the two sliding grooves (33) being symmetrically arranged along the width direction of the workbench (1), a support block (34) slidably arranged in the sliding grooves (33) being installed at the lower end of the control box (31), two bidirectional cylinders (35) being symmetrically arranged inside the workbench (1) along the length direction, the bidirectional cylinder (35) being located between the two sliding grooves (33), and two telescopic ends of the bidirectional cylinder (35) being respectively connected to the support blocks (34) opposite thereto; the clamping unit (3) further comprises a support block (34) installed on the control box (31) a positioning column (36) inside, the outer wall of the positioning column (36) is provided with a plurality of execution groups equidistantly along the axis direction, the execution groups include two support rods (37) symmetrically distributed along the axis of the positioning column (36) in the upper and lower directions, the ends of the plurality of support rods (37) on the positioning column (36) being on the same horizontal line are provided with a limit column (32) in common, the outer wall of the limit column (32) is provided with a rubber roller (38), the execution groups also include an angle adjustment component (39) and a length adjustment component (40) for adjusting the support rods (37), and the outer wall of the control box (31) is provided with a driving component (41); The support rod (37) is rotatably sleeved on the outer wall of the positioning column (36); the angle adjustment component (39) includes a receiving groove (391) provided inside the support rod (37); a rotating ball (392) is slidably arranged in the receiving groove (391); a fixing plate (393) is installed in the middle of the inner wall of the control box (31); a double-headed screw (394) is inserted through the two rotating balls (392) of the same execution group so as to rotate together; the double-headed screw (394) rotates through the fixing plate (393); the upper ends of the multiple double-headed screws (394) all pass through the control box (31) and are sleeved with belts (395); The length adjustment assembly (40) comprises a positioning plate (401), the support rod (37) is a telescopic rod, two positioning plates (401) are symmetrically arranged on the outer walls of the two fixed ends of the support rod (37) up and down, a return spring rod (402) is arranged between the two positioning plates (401) on the same side of the support rod (37), the positioning plates (401) on the opposite sides of the two support rods (37) of the same execution group are telescopic plates, and a force plate (403) is hinged between the two positioning plates (401) at the upper and lower corresponding positions.

2. The transmission shaft clamping and welding integrated equipment according to claim 1, characterized in that: The support unit (2) further comprises a retractable spring rod (22), and both ends of the control box (31) in the length direction are provided with a retractable spring rod (22), and a pull plate (23) is installed on the ends of the two retractable spring rods (22) on the same side of the two control boxes (31); the upper end of the pull plate (23) has a guide section inclined toward a side away from the control box (31), and a rubber pad (24) is installed in the middle of a side of the pull plate (23) close to the control box (31).

3. The transmission shaft clamping and welding integrated equipment according to claim 1, characterized in that: The support frame (21) is composed of a bottom support frame (211), a vertical plate (212) and a bearing plate (213), wherein the bottom support frame (211) is installed in the middle of the upper end of the workbench (1), the length direction of the bottom support frame (211) is parallel to the length direction of the workbench (1), and a plurality of vertical plates (212) are arranged at equal intervals on the upper end of the bottom support frame (211) along the width direction, the heights of the plurality of vertical plates (212) gradually decrease from both sides to the middle of the bottom support frame (211), and the bearing plate (213) is rotatably installed on the upper end of the vertical plate (212).

4. The transmission shaft clamping and welding integrated equipment according to claim 1, characterized in that: The length adjustment assembly (40) further comprises a support (404), and the two force-bearing plates (403) of the same execution group are both installed with the support (404) on the opposite sides. The control box (31) is installed with mounting plates (405) pointing to the middle side of the workbench (1) on both sides in the length direction. A rotating shaft (406) is rotatably passed through the two mounting plates (405) of the same control box (31). The outer wall of the rotating shaft (406) is sleeved with a plurality of rotating wheels (407) that are rotatably opposed to the support (404), and the outer wall of the rotating wheel (407) has two symmetrically distributed protrusions. The control box (31) is rotatably provided with positioning shafts (408) on both side walls in the length direction. The outer wall of the positioning shaft (408) is fixedly sleeved with a control handle (409), and the positioning shaft (408) is connected to the rotating shaft (406) by a belt drive.

5. The transmission shaft clamping and welding integrated equipment according to claim 1, characterized in that: The driving assembly (41) comprises a fixed shaft (411), both side walls of the control box (31) in the length direction are rotatably provided with the fixed shaft (411), a first elastic belt (412) is sleeved between two limit columns (32) and the fixed shaft (411) on the same control box (31), a tensioning shaft (413) is rotatably installed on the outer wall of the control box (31) and abuts against the outer bending part of the first elastic belt (412), and a driving motor (414) connected to any fixed shaft (411) is provided on the outer wall of any control box (31) via a motor seat.

6. The transmission shaft clamping and welding integrated equipment according to claim 1, characterized in that: The driving assembly (41) further comprises a second elastic belt (415) sleeved on the ends of two limiting columns (32) located below, and a transition shaft (416) is provided below the two limiting columns (32) located below the transmission shaft (7) to be welded and abuts against the inner bending part of the second elastic belt (415), and a stabilizing plate (417) connected to the upper end of the workbench (1) is rotatably mounted on both ends of the transition shaft (416), and an auxiliary shaft (418) is also rotatably mounted on the stabilizing plate (417) and abuts against the outer bending part of the second elastic belt (415).

7. The transmission shaft clamping and welding integrated equipment according to claim 1, characterized in that: The middle welding unit (5) further comprises a stabilizing frame (52) mounted in the middle of the upper end of the workbench (1); a telescopic cylinder (53) is mounted in the middle of the upper end of the stabilizing frame (52); a welding machine (51) is arranged at the telescopic end of the bottom of the telescopic cylinder (53) via a bearing plate (213); the welding machine (51) is located above the joint of the two transmission shafts (7) to be welded.

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