Stepped shaft sleeve welding device

Abstract

The utility model relates to the technical field of shaft sleeve machining, in particular to a stepped shaft sleeve welding device which comprises a rack, a clamp assembly used for clamping a workpiece and a welding gun used for welding are arranged on the rack, and the clamp assembly comprises at least two bases which are arranged on the rack in a sliding mode and arranged in sequence. A mounting frame is arranged on each base, a connecting pipe is arranged on each mounting frame, a main shaft is rotationally arranged on each connecting pipe, a fixing part used for fixing a workpiece is arranged at one end of each main shaft, and the axis of each main shaft coincides with the axis of the fixed shaft sleeve type workpiece; a driving part for driving the main shaft to rotate is arranged at one end, far away from the fixed part, of the main shaft; a welding gun support used for installing a welding gun is further arranged on the machine frame. After clamping a shaft sleeve type workpiece, the shaft sleeve type clamp can drive the workpiece to rotate along the axis of the workpiece so as to achieve girth welding of the workpiece, and the problem that an existing shaft sleeve type clamp is inconvenient to conduct girth welding is solved.

Description

Technical Field

[0001] The present application relates to the technical field of shaft sleeve processing, and in particular to a stepped shaft sleeve welding device. Background Art

[0002] A shaft sleeve is a mechanical part with a cylindrical shape. When placed on a rotating shaft, it can protect the shaft or reduce the friction between the shaft and the bearing. The Chinese patent publication number is CN202402484U, and the publication date is August 29, 2012. The name of the invention is a shaft sleeve with a welded structure. The application discloses a shaft sleeve in which a shaft sleeve body and an end ring are coaxially sleeved and welded together, and a step shape is formed inside the shaft sleeve.

[0003] The stepped sleeve in the above-mentioned related technology needs to be welded. The Chinese patent announcement number is CN218341410U, and the announcement date is January 20, 2023. The name of the invention is an adjustable clamp for welding sleeve-type workpieces. The application discloses that the clamp includes a shaft seat, a turntable connected to the shaft seat in a vertical direction, and a handle is fixed on the turntable. A connecting tube is provided on the upper surface of the turntable, and the rotating tube can be controlled to rotate in the horizontal direction by a worm gear. A threaded rod is rotatably arranged in the connecting tube to adjust the movable plate to be close to or away from the fixed plate. The workpiece to be processed is clamped by the movable plate and the fixed plate. After clamping, the direction and angle of the workpiece are controlled by the worm gear or the turntable to facilitate welding.

[0004] However, the sleeve is cylindrical in shape, and the probability of annular welding is high. For example, when welding the above-mentioned stepped sleeve, it is necessary to perform annular welding between the sleeve body and the end ring. However, after the fixture in the above-mentioned related technology clamps the sleeve workpiece, the workpiece can rotate along the turntable or along the axis of the connecting pipe, but the axis of the connecting pipe is perpendicular to the axis of the workpiece, and the axis of the turntable and the axis of the workpiece do not necessarily coincide, which makes it inconvenient for the sleeve workpiece to rotate along its own axis during annular welding. During annular welding, the welding gun can only be driven to rotate, which makes it easy for the welding gun connecting wire to get tangled or the welding position of the welding gun to shift, which is inconvenient to operate and affects the welding quality. Utility Model Content

[0005] In order to improve the problem that existing shaft sleeve clamps are inconvenient for circumferential seam welding, the present application provides a stepped shaft sleeve welding device.

[0006] The present application provides a stepped sleeve welding device, which adopts the following technical solution:

[0007] A stepped sleeve welding device comprises a frame, on which a clamp assembly for clamping a workpiece and a welding gun for welding are provided, the clamp assembly comprises at least two bases slidably arranged on the frame and arranged in sequence, each of the bases is provided with a mounting frame, the mounting frame is provided with a connecting pipe, a main shaft is rotatably provided on the connecting pipe, one end of the main shaft is provided with a fixing portion for fixing the workpiece, the axis of the main shaft coincides with the axis of the sleeve-like workpiece after being fixed, and the end of the main shaft away from the fixing portion is provided with a driving portion for driving the main shaft to rotate; the frame is also provided with a welding gun bracket for mounting the welding gun.

[0008] By adopting the above technical solution, the fixing parts on the two mounting frames can clamp the shaft sleeve body and the end ring respectively, and keep the shaft sleeve body and the end ring in a coaxial sleeve state; then the driving part is used to drive the spindle to rotate. Since the shaft sleeve workpiece is cylindrical in shape, the spindle axis is coaxial with the clamped workpiece, and the spindle rotation process can drive the workpiece to rotate along its own axis; finally, the welding gun is placed on the welding gun bracket, and the welding gun is used to perform circumferential seam welding on the rotating workpiece; in this way, the welding seam welding operation can be realized, and at the same time, the welding gun bracket can assist in stabilizing the position of the welding gun, which helps to improve the welding quality.

[0009] Optionally, the frame is provided with a sliding seat for sliding along the arrangement direction of the mounting frame, and the welding gun bracket is ball-hinged at the top of the sliding seat.

[0010] By adopting the above technical solution, after the workpiece is clamped, the workpiece can be kept still, and the driving sliding seat drives the welding gun to slide back and forth, thereby achieving linear welding and improving the practicality of the welding device.

[0011] Optionally, a first limit portion is provided on the base to limit the position of the base and the frame; the mounting frame is rotatably connected to the base, the rotation axis of the mounting frame is perpendicular to the sliding direction of the mounting frame, and a second limit portion is provided on the mounting frame to limit the position of the mounting frame and the base; the connecting tube is rotatably connected to the mounting frame, the rotation axis of the connecting tube is perpendicular to the rotation axis of the mounting frame, and a third limit portion is provided on the mounting frame to limit the rotation angle of the connecting tube; the main shaft rotation axis is perpendicular to the rotation axis of the connecting tube.

[0012] By adopting the above technical solution, the orientation of the workpiece on the mounting frame can be adjusted by rotating the mounting frame, and the angle of the workpiece with the horizontal direction can be adjusted by using the connecting pipe, thereby achieving adjustment of the angle and direction of the workpiece and improving the practicality of the welding device.

[0013] Optionally, the first limiting part includes a limiting pin slidably arranged on the base and a limiting rack fixed to the frame, and a limiting tooth is fixedly arranged on the end of the limiting pin, and the limiting tooth can be inserted into the tooth groove of the limiting rack; a limiting spring is also arranged on the base to push the limiting pin close to the limiting rack.

[0014] By adopting the above technical solution, a limit spring is used to force the limit teeth on the limit pin to be inserted into the tooth groove of the limit rack, thereby limiting the position of the base, helping to stabilize the position of the workpiece, which is beneficial to improving the stability during welding operations and helping to improve welding quality.

[0015] Optionally, the second limiting portion includes a plurality of limiting ears fixed to the mounting frame, and a plurality of arc grooves are evenly opened on the base along the rotation axis of the mounting frame. A limiting bolt is passed through and arranged in the limiting ears, and the limiting bolt passes through the limiting ears and the arc grooves in sequence and is threadedly connected to the limiting nut.

[0016] By adopting the above technical solution, when the mounting frame is rotated to a specified angle, the relative positions of the two can be fixed by using limit bolts and limit nuts, thereby limiting the rotation angle of the mounting frame and limiting the orientation of the workpiece, which helps to stabilize the position of the workpiece and improve welding quality.

[0017] Optionally, a connecting shaft is coaxially fixed on the connecting tube, and the connecting shaft is rotatably connected to the mounting frame; the third limiting portion includes a limiting wheel coaxially fixed to the connecting shaft and a limiting plug fixed to the mounting frame, and the end of the limiting plug is fixedly provided with teeth, and the teeth can be inserted into the tooth grooves of the limiting wheel, and the mounting frame is also provided with a thrust spring for pushing the limiting plug close to the limiting wheel.

[0018] By adopting the above technical solution, the propulsion spring is used to force the teeth on the limit plug to be inserted into the tooth groove of the limit wheel, thereby limiting the rotation angle of the connecting pipe, helping to stabilize the position of the workpiece, which is beneficial to improving the stability during welding operations and helping to improve welding quality.

[0019] Optionally, the fixing part includes a mounting plate fixed to the end of the main shaft and a double-headed screw rotatably arranged on the mounting plate, the thread segments at both ends of the double-headed screw have the same pitch but opposite rotation directions, and the two thread segments of the double-headed screw with different rotation directions are threadedly connected with inferior arc-shaped clamping blocks, and the two clamping blocks are symmetrically distributed along the axis of the main shaft.

[0020] By adopting the above technical solution, rotating the double-headed screw can drive the clamping blocks to move closer to or away from each other to clamp the workpiece, and the clamping blocks are symmetrically distributed along the axis of the spindle in an arc shape, so that the center line of the clamped workpiece can be located on the axis of the spindle, thereby ensuring that the axis of the workpiece coincides with the axis of the spindle after clamping, and when the spindle rotates, it can drive the workpiece to rotate along its own axis.

[0021] Optionally, the side walls of the clamping blocks facing each other are provided with an inner rubber layer, and the side walls of the clamping blocks facing away from each other are provided with an outer rubber layer.

[0022] By adopting the above technical solution, when the size of the clamped cylindrical workpiece is larger than the diameter of the two arc-shaped clamping blocks, the clamping blocks can be located inside the large-sized workpiece to achieve clamping, thereby reducing the impact of the clamping blocks on processing; when the size of the clamped shaft workpiece is smaller than the diameter of the two arc-shaped clamping blocks, the clamping blocks can be located outside the small-sized workpiece to achieve clamping, thereby expanding the workpiece clamping range and improving the practicability of the device.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. After the fixture assembly clamps the sleeve-type workpiece, it can drive the workpiece to rotate along its own axis, and then use the welding gun to perform circumferential seam welding on the rotating workpiece, thereby improving the problem that the existing sleeve-type fixture is inconvenient for circumferential seam welding;

[0025] 2. The slidable welding gun bracket can also be used to perform linear welding on the clamped workpiece, which improves the practicality of the welding device;

[0026] 3. The angle and orientation of the workpiece can be adjusted by using a rotatable mounting frame and a rotatable rotating tube, thereby improving the practicality of the welding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is an overall diagram of an embodiment of the present application.

[0028] Figure 2 It is a schematic diagram of the structure of the clamp assembly in an embodiment of the present application.

[0029] Figure 3 It is a schematic diagram of the structure of the main axis in an embodiment of the present application.

[0030] Description of reference numerals: 1, frame; 2, welding gun assembly; 201, sliding seat; 202, welding gun bracket; 203, welding gun; 3, fixture assembly; 4, base; 5, first limiting portion; 501, limiting pin; 502, limiting tooth; 503, limiting rack; 504, limiting spring; 6, mounting frame; 7, second limiting portion; 701, arc groove; 702, limiting ear; 703, limiting bolt; 8. Connecting pipe; 801. Connecting shaft; 802. Worm wheel; 803. Worm; 804. Turning knob; 9. Third limiting part; 901. Limiting wheel; 902. Limiting plug; 903. Tooth; 904. Propulsion spring; 10. Main shaft; 11. Fixing part; 111. Mounting plate; 112. Double-headed screw; 113. Clamping block; 114. Adjusting knob; 12. Driving part; 121. Turntable. DETAILED DESCRIPTION

[0031] The following is combined with Figures 1 to 3 This application is described in further detail.

[0032] The present application embodiment discloses a stepped sleeve welding device, referring to Figure 1 , including a frame 1 that can be placed or fixed on a horizontal desktop, and a welding gun assembly 2 and a plurality of clamp assemblies 3 are arranged on the frame 1. Among them, the clamp assemblies 3 are arranged in sequence along the length direction of the frame 1, and each clamp assembly 3 can clamp a workpiece, and two adjacent clamp assemblies 3 can respectively clamp two workpieces that can cooperate with each other to perform welding work. In the embodiment of the present application, among the two adjacent clamp assemblies 3, one can clamp the shaft sleeve body, and the other can clamp the end ring, and the shaft sleeve body and the end ring can coaxially cooperate with each other under the clamping of the clamp assembly 3. The welding gun assembly 2 includes a sliding seat 201 that is slidably connected to the upper surface of the frame 1 along the length direction of the frame 1 and a welding gun bracket 202 that is ball-hinged at the top of the sliding seat 201, and a welding gun 203 is placed on the welding gun bracket 202 to assist in stabilizing the position of the welding gun 203.

[0033] Reference Figure 1 and Figure 2The clamp assembly 3 includes a base 4 slidably arranged on the frame 1 along the length direction of the frame 1, and a first limiter 5 is arranged on the base 4 to limit the relative position between the base 4 and the frame 1. A mounting frame 6 is rotatably arranged on the base 4, and the rotation axis of the mounting frame 6 is perpendicular to the length direction of the frame 1, and the rotation axis of the mounting frame 6 is perpendicular to the upper surface of the frame 1. A second limiter 7 is arranged on the mounting frame 6 to limit the relative position between the mounting frame 6 and the base 4. A connecting pipe 8 is rotatably arranged on the top of the mounting frame 6, and the rotation axis of the connecting pipe 8 is perpendicular to the rotation axis of the mounting frame 6, and the rotation axis of the connecting pipe 8 is parallel to the upper surface of the frame 1, and a third limiter 9 is arranged on the mounting frame 6 to limit the rotation angle of the connecting pipe 8. A main shaft 10 is rotatably arranged in the middle of the connecting pipe 8, and a driving part 12 for driving the main shaft 10 to rotate is arranged at one end of the main shaft 10, and a fixing part 11 for fixing the workpiece is arranged at the other end of the main shaft 10. In addition, when the connecting tube 8 is rotated to the state where the axis of the main shaft 10 is parallel to the rotation axis of the mounting frame 6, the rotation axis of the main shaft 10 coincides with the rotation axis of the mounting frame 6, so that the axis of the clamped workpiece coincides with the rotation axis of the mounting frame 6 in this state, so that when the workpiece is inconvenient to be driven to rotate by the driving part 12 in a vertical state, the workpiece can be rotated by rotating the mounting frame 6.

[0034] Reference Figure 2 The first limiting part 5 includes a limiting pin 501 slidably disposed on the side wall of the base 4, and the limiting pin 501 is similar to a T-shaped shape. The sliding direction of the limiting pin 501 is parallel to the rotation axis of the mounting frame 6, and a limiting tooth 502 is fixedly disposed at the bottom end of the limiting pin 501. A limiting rack 503 is fixedly disposed on the frame 1 along its own length direction, and the limiting tooth 502 can be inserted into the tooth groove of the limiting rack 503. At the same time, a limiting spring 504 is fixedly disposed on the limiting tooth 502, and the expansion and contraction direction of the limiting spring 504 is parallel to the sliding direction of the limiting pin 501. The end of the limiting spring 504 away from the limiting tooth 502 is fixed to the base 4, and the limiting spring 504 can push the limiting tooth 502 to approach and be inserted into the tooth groove of the limiting rack 503.

[0035] Reference Figure 2 The top of the base 4 and the bottom of the mounting frame 6 are both set to be disc-shaped. The top of the base 4 is evenly penetrated by a plurality of arc grooves 701 with the rotation axis of the mounting frame 6 as the center. The center of the arc groove 701 coincides with the rotation axis of the mounting frame 6. The second limiting portion 7 includes a plurality of limiting ears 702 fixedly set on the side wall of the mounting frame 6. The plurality of limiting ears 702 are evenly distributed with the rotation axis of the mounting frame 6 as the center. The number of limiting ears 702 is inconsistent with the number of arc grooves 701. A limiting bolt 703 is passed through and set on one of the limiting ears 702. The limiting bolt 703 can pass through any limiting ear 702 and the arc groove 701 in sequence and be threadedly connected to the limiting nut. Thereby limiting the relative position between the mounting frame 6 and the base 4.

[0036] Reference Figure 3 A connecting shaft 801 is fixedly arranged on the connecting tube 8, and the connecting shaft 801 is rotatably connected to the top of the mounting frame 6, and the axis of the connecting shaft 801 coincides with the rotation axis of the connecting tube 8. One end of the connecting shaft 801 is rotatably connected to the mounting frame 6 and is coaxially fixedly connected to a worm gear 802, and a worm 803 is also rotatably connected to the mounting frame 6, and the worm gear 802 and the worm 803 are meshed with each other, and one end of the worm 803 is provided with a knob 804 for easy operation by the staff.

[0037] Reference Figure 2 and Figure 3 The third limiting part 9 includes a limiting wheel 901 coaxially fixedly connected to the end of the connecting shaft 801 passing through the mounting frame 6 and a limiting plug 902 slidably arranged on the mounting frame 6. The limiting plug 902 has a similar structure and principle to the limiting pin 501. The sliding direction of the limiting plug 902 is perpendicular to the axis of the connecting shaft 801. The limiting plug 902 is fixedly provided with a plurality of teeth 903 at one end facing the limiting wheel 901. The teeth 903 can be inserted into several adjacent tooth grooves on the limiting wheel 901. A propulsion spring 904 is fixed on the teeth 903. The extension direction of the propulsion spring 904 is parallel to the sliding direction of the limiting plug 902. The end of the propulsion spring 904 away from the teeth 903 is fixed to the mounting frame 6. The propulsion spring 904 can push the teeth 903 to approach and insert into the tooth groove of the limiting wheel 901, thereby limiting the rotation angle of the connecting pipe 8.

[0038] Reference Figure 1 and Figure 3 The fixing part 11 includes a mounting plate 111 fixedly connected to one end of the spindle 10, and a double-headed screw 112 is connected to the mounting plate 111 through internal threads. The axis of the double-headed screw 112 is perpendicular to the axis of the spindle 10, and the thread segments at both ends of the double-headed screw 112 have the same pitch but opposite rotation directions. The midpoint of the intersection of the thread segments with different rotation directions at both ends of the double-headed screw 112 is located on the extension line of the axis of the spindle 10. At the same time, the thread segments with different rotation directions of the two sections of the double-headed screw 112 are threadedly connected with inferior arc-shaped clamping blocks 113. The two clamping blocks 113 are symmetrically distributed with the axis of the spindle 10 as the center, so that the axis of the workpiece clamped between the two clamping blocks 113 coincides with the axis of the spindle 10. One end of the double-headed screw 112 passes through the mounting plate 111 and is coaxially fixedly connected with an adjusting button 114. In addition, an inner rubber layer is fixedly provided on the side walls of the two clamping blocks 113 facing each other, and an outer rubber layer is fixedly provided on the side walls of the two clamping blocks 113 facing away from each other, so as to reduce damage to the workpiece during clamping. The driving part 12 can be set as a motor or a turntable 121 that is convenient for manual operation. In the embodiment of the present application, it is set as a turntable 121 that is coaxially fixedly connected to the end of the spindle 10. After the workpiece is clamped, the operator can drive the turntable 121 to rotate, thereby driving the spindle 10 to rotate, so that the workpiece rotates along its own axis, so as to perform the circumferential seam welding operation.

[0039] The implementation steps of a stepped sleeve welding device in the embodiment of the present application are as follows:

[0040] S1. Install the workpiece and the welding gun 203: Place the workpiece between the two clamping blocks 113, and turn the adjusting knob 114 to drive the two clamping blocks 113 to move closer or farther away until they abut against the side wall of the workpiece, thereby fixing the workpiece; at the same time, place the welding gun 203 on the welding gun bracket 202 to assist in stabilizing the position of the welding gun 203;

[0041] S2. After the limiting pin 501 is pulled to make the limiting tooth 502 move away from the limiting rack 503, the base 4 is pushed to slide on the frame 1. After it is in place, the limiting spring 504 is used to force the limiting tooth 502 on the limiting pin 501 to be inserted into the tooth groove of the limiting rack 503, so as to limit the base 4.

[0042] S3, after pulling the limiting plug 902 to make the teeth 903 away from the limiting wheel 901, turn the knob 804 to drive the worm 803 to rotate, and then drive the worm wheel 802 to rotate to control the connection tube 8 to rotate. After it is in place, the propulsion spring 904 is used to force the teeth 903 to approach and insert into the tooth groove of the limiting wheel 901 to limit the rotation angle of the connection tube 8; at the same time, drive the mounting frame 6 to rotate, and then use the limiting bolt 703 to pass through the limiting ear 702 and the arc groove 701 in sequence and be threadedly connected to the limiting nut to limit the mounting frame 6; thereby adjusting the angle and direction of the main shaft 10;

[0043] S4. Choose different welding methods according to specific welding requirements:

[0044] S4.1. If circumferential seam welding is to be performed, after the angle position of the main shaft 10 is adjusted, the turntable 121 is rotated to drive the main shaft 10 to rotate, while the welding gun 203 is controlled to perform welding;

[0045] S4.2, if linear welding is to be performed, after the angular position of the spindle 10 is adjusted, the welding gun bracket 202 is pushed to slide on the frame 1 while the welding gun 203 is controlled to perform welding.

[0046] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A stepped sleeve welding device, comprising a frame (1), on which a clamp assembly (3) for clamping a workpiece and a welding gun (203) for welding are arranged, characterized in that: The clamp assembly (3) comprises at least two bases (4) which are slidably arranged on a frame (1) and arranged in sequence, each of the bases (4) being provided with a mounting frame (6), each of the mounting frames (6) being provided with a connecting pipe (8), a main shaft (10) being rotatably arranged on the connecting pipe (8), one end of the main shaft (10) being provided with a fixing portion (11) for fixing a workpiece, the axis of the main shaft (10) being coincident with the axis of a sleeve-like workpiece after being fixed, and one end of the main shaft (10) being provided with a driving portion (12) for driving the main shaft (10) to rotate; and a welding gun bracket (202) for mounting a welding gun (203) is also provided on the frame (1).

2. A stepped sleeve welding device according to claim 1, characterized in that: The frame (1) is provided with a sliding seat (201) which is slidable along the arrangement direction of the mounting frame (6), and the welding gun bracket (202) is ball-hinged at the top end of the sliding seat (201).

3. A stepped sleeve welding device according to claim 1, characterized in that: The base (4) is provided with a first limiting portion (5) to limit the position of the base (4) and the frame (1); the mounting frame (6) is rotatably connected to the base (4), the rotation axis of the mounting frame (6) is perpendicular to the sliding direction of the mounting frame (6), and the mounting frame (6) is provided with a second limiting portion (7) to limit the position of the mounting frame (6) and the base (4); the connecting tube (8) is rotatably connected to the mounting frame (6), the rotation axis of the connecting tube (8) is perpendicular to the rotation axis of the mounting frame (6), and the mounting frame (6) is provided with a third limiting portion (9) to limit the rotation angle of the connecting tube (8); the rotation axis of the main shaft (10) is perpendicular to the rotation axis of the connecting tube (8).

4. A stepped sleeve welding device according to claim 3, characterized in that: The first limiting portion (5) comprises a limiting pin (501) slidably arranged on the base (4) and a limiting rack (503) fixed to the frame (1); a limiting tooth (502) is fixedly arranged at the end of the limiting pin (501), and the limiting tooth (502) can be inserted into the tooth groove of the limiting rack (503); and a limiting spring (504) for pushing the limiting pin (501) close to the limiting rack (503) is also arranged on the base (4).

5. A stepped sleeve welding device according to claim 3, characterized in that: The second limiting portion (7) comprises a plurality of limiting ears (702) fixed to the mounting frame (6); a plurality of arc-shaped grooves (701) are evenly provided on the base (4) along the rotation axis of the mounting frame (6); limiting bolts (703) are passed through and arranged in the limiting ears (702); the limiting bolts (703) pass through the limiting ears (702) and the arc-shaped grooves (701) in sequence and are threadedly connected to the limiting nuts.

6. A stepped sleeve welding device according to claim 3, characterized in that: A connecting shaft (801) is coaxially fixed on the connecting tube (8), and the connecting shaft (801) is rotatably connected to the mounting frame (6); the third limiting portion (9) comprises a limiting wheel (901) coaxially fixed to the connecting shaft (801) and a limiting plug (902) fixed to the mounting frame (6); teeth (903) are fixedly provided at the end of the limiting plug (902), and the teeth (903) can be inserted into the tooth groove of the limiting wheel (901); and a propulsion spring (904) for pushing the limiting plug (902) close to the limiting wheel (901) is also provided on the mounting frame (6).

7. The step sleeve welding device according to claim 1, characterized in that: The fixing portion (11) comprises a mounting plate (111) fixed to the end of the main shaft (10) and a double-headed screw (112) rotatably arranged on the mounting plate (111); the thread segments at both ends of the double-headed screw (112) have the same pitch but opposite rotation directions; the two thread segments of the double-headed screw (112) with different rotation directions are both threadedly connected with inferior arc-shaped clamping blocks (113); and the two clamping blocks (113) are symmetrically distributed along the axis of the main shaft (10).

8. A stepped sleeve welding device according to claim 7, characterized in that: The side walls of the clamping blocks (113) facing each other are provided with an inner rubber layer, and the side walls of the clamping blocks (113) facing away from each other are provided with an outer rubber layer.

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