CN112264761B

CN112264761B - Welding device for hydraulic cylinder

Info

Publication number: CN112264761B
Application number: CN202011113598.7A
Authority: CN
Inventors: 陈冬根; 潘肖列; 汤关云
Original assignee: Zhejiang Tiangong Hydraulic Machinery Co ltd
Current assignee: Zhejiang Tiangong Hydraulic Machinery Co ltd
Priority date: 2020-10-17
Filing date: 2020-10-17
Publication date: 2022-05-24
Anticipated expiration: 2040-10-17
Also published as: CN112264761A

Abstract

The utility model relates to a pneumatic cylinder welding technology field especially relates to a welding set for pneumatic cylinder, which comprises a mounting bas, first mounting groove has been seted up to one side of mount pad, the one end of first mounting groove is provided with and is used for centre gripping shell pivoted centre gripping subassembly, be provided with the soldered connection that is cavity setting in the first mounting groove, the both ends of soldered connection all communicate with the external world, the vertical setting down of welding nozzle of soldered connection, be provided with the regulating part that is used for adjusting the soldered connection height in the first mounting groove, be fixed with the rectifier on the lateral wall of mount pad, the welding nozzle of soldered connection passes through the wire electricity and connects on the rectifier, the second mounting groove has been seted up to one side that the mount pad deviates from first mounting groove, be provided with in the second mounting groove and be used for carrying the conveying subassembly of welding wire to the welding nozzle. This application has the effect that promotes pneumatic cylinder welding quality.

Description

Welding device for hydraulic cylinder

Technical Field

The application relates to the technical field of hydraulic cylinder welding, in particular to a welding device for a hydraulic cylinder.

Background

The hydraulic cylinder is a hydraulic actuator which converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has simple structure and reliable operation. When it is used to implement reciprocating motion, it can omit speed-reducing device, and has no transmission gap, and its motion is stable, so that it can be extensively used in various mechanical hydraulic systems. The output force of the hydraulic cylinder is in direct proportion to the effective area of the piston and the pressure difference between the two sides of the effective area; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder cover, a piston and a piston rod, a sealing device, a buffering device and an exhaust device.

The existing hydraulic cylinder manufacturers generally split the hydraulic cylinder into a plurality of parts to process in a large scale in the process of manufacturing the hydraulic cylinder, the processed parts of each part are classified and placed in a warehouse, each part can be extracted from the existing part warehouse according to the quantity of orders and can be assembled, and an electric welding machine is used for welding in the process of assembling the cylinder body of the hydraulic cylinder.

Referring to fig. 1, a cylinder body 43 of the known hydraulic cylinder includes a housing 44 and a base 45, the housing 44 is a cylindrical metal casing, the housing 44 is mainly made of forty-five steel, an inner chamfer is formed on an inner wall of one end of the housing 44, the base 45 includes a bottom plate 46 and a connecting sleeve 47, the connecting sleeve 47 is integrally formed on one side of the bottom plate 46, a circular truncated cone 48 is integrally formed on one end of the connecting plate 17, which is far away from the connecting sleeve 47, the circular truncated cone 48 is embedded in an inner cavity of the end of the housing 44, which is provided with the inner chamfer, the circular truncated cone 48 is in interference fit with the housing 44, and one end of the bottom plate 46, which is far away from the connecting sleeve 47, is attached to an end surface of the housing 44.

The in-process of installation base is erect the shell and is placed for the one end that the interior chamfer was seted up to the shell is vertical sets up upwards, then places the round platform in the one end that the interior chamfer was seted up to the shell, uses the hammer to strike the bottom plate, makes the round platform card go into the inner chamber of shell in, welds through carbon dioxide protection, welds shell and bottom plate laminating department by hand, because the terminal surface of shell is circular, consequently welding personnel need weld while rotating at the welded in-process.

In view of the above-mentioned related art, the inventor believes that, during welding, since a welder needs to weld during rotation, the welding quality is poor due to uneven rotation speed of the welder.

Disclosure of Invention

In order to promote welding quality, this application provides a welding set for pneumatic cylinder.

The application provides a welding set for pneumatic cylinder adopts following technical scheme:

the utility model provides a welding set for pneumatic cylinder, includes the mount pad, first mounting groove has been seted up to one side of mount pad, the one end of first mounting groove is provided with and is used for centre gripping shell pivoted centre gripping subassembly, be provided with the soldered connection that is cavity setting in the first mounting groove, the both ends of soldered connection all communicate with the external world, the vertical setting down of welding nozzle of soldered connection, be provided with the regulating part that is used for adjusting the soldered connection height in the first mounting groove, be fixed with the rectifier on the lateral wall of mount pad, the welding nozzle of soldered connection passes through the wire electricity and is connected on the rectifier, the second mounting groove has been seted up to one side that the mount pad deviates from first mounting groove, be provided with in the second mounting groove and be used for carrying the conveying subassembly of welding wire to the welding nozzle.

Through adopting above-mentioned technical scheme, carry the welding wire in the nozzle through conveying assembly case soldered connection, among the welding process, in advance through the round platform joint with the base in the bottom of shell, the shell that will assemble is passing through the centre gripping subassembly centre gripping shell, make the welding position of nozzle contact shell through the regulating part, make the shell at the uniform velocity slow rotation round self axial simultaneously, open the switch of rectifier, make the welding wire melt in nozzle department, the welding that melts drips and drips the seam crossing at shell and base, thereby realize automatic weld, whole welding process need not artificially weld round the circumference of shell completely, the welding quality of pneumatic cylinder has been promoted.

Optionally, the clamping assembly includes a first servo motor fixed on the mounting seat, and a three-jaw chuck coaxially fixed on a rotating shaft of the first servo motor, and one end of the housing, which is far away from the base, is clamped on the three-jaw chuck.

Through adopting the above technical scheme, the in-process of centre gripping pneumatic cylinder shell, keep away from the one end centre gripping of round platform with the shell on the three-jaw chuck, the welded in-process, adjust first servo motor's slew velocity in advance, open first servo motor's switch, make first servo motor's pivot and three-jaw chuck rotate together, thereby make the shell rotate round the axial of three-jaw chuck, the welding nozzle of soldered connection contacts the outer wall of shell, thereby realize that the welding nozzle welds round shell a week, and it is convenient to weld.

Optionally, the adjusting part includes a slide rail fixed in the first mounting groove, a slide seat sliding on the slide rail, a driving part arranged on the slide seat and used for driving the slide seat to horizontally slide, a mounting plate fixed on the upper surface of the slide seat and vertically arranged, a screw rod rotating on one side of the mounting plate facing the welding head, a first handwheel coaxially fixed at the upper end of the screw rod, and a connecting plate sliding on the mounting plate, wherein the screw rod is vertically arranged, the connecting plate is in threaded connection with the screw rod, and the welding head is fixed at one end of the connecting plate far away from the mounting plate.

Through adopting above-mentioned technical scheme, adjust the high in-process of soldered connection, rotate first hand wheel for first hand wheel rotates together with the lead screw, thereby orders about the connecting plate and vertically slides along the direction of height of mounting panel, until the nozzle contact shell's of soldered connection outer wall.

Optionally, the driving part comprises an installation cover fixed at one end of the sliding seat facing the outside, a worm rotated on the inner wall of the installation cover, a second hand wheel coaxially fixed at one end of the worm rotating shaft extending out of the installation cover, a worm wheel rotated on the inner wall of the installation cover, a first bevel gear coaxially fixed on the worm wheel rotating shaft, a second bevel gear rotated on the inner wall of the installation cover, a positioning gear coaxially fixed on the second bevel gear rotating shaft, and a rack fixed on one side of the sliding rail close to the installation cover, wherein the worm is meshed with the worm wheel, the first bevel gear is meshed with the second bevel gear, and the positioning gear is meshed with the rack.

Through adopting above-mentioned technical scheme, according to the length of pneumatic cylinder shell, rotate the second hand wheel for worm meshing worm wheel rotates, and the worm wheel rotates with first bevel gear, and first bevel gear meshing second bevel gear rotates, thereby second bevel gear rotates with the positioning gear, makes the positioning gear roll on the rack along the length direction of slide rail, and the installation cover slides along the length direction of slide rail together with the slide, and the interval between until slide and the three-jaw chuck is less than or equal to the shell length of pneumatic cylinder.

Optionally, a sliding block slides on the sliding rail, an installation frame is fixed on the upper surface of the sliding block, a limiting bolt is connected to the installation frame through threads, the upper end of the installation frame is arc-shaped, and supporting pieces used for reducing abrasion between the installation frame and the shell are arranged on the two sides of the installation frame.

Through adopting above-mentioned technical scheme, according to the shell length of pneumatic cylinder, the slider slides in advance for interval less than or equal to the length of shell between slider and the three-jaw chuck, with the one end centre gripping of shell on the three-jaw chuck, the other end is placed in the circular arc concave surface of installing frame, withstands the one end of shell orientation installing frame firmly through support piece, thereby has promoted shell pivoted stability, has further promoted welding quality.

Optionally, support piece is including the installation pole of sliding on the installing frame, rotate gyro wheel, the butt joint pole of threaded connection on the installation pole on the installing frame, the mounting hole that is the slope setting is all seted up to the both sides of installing frame, the one end height that the mounting hole communicates installing frame upper end outer wall is greater than the other end height, the installation pole slides in the mounting hole, two the contained angle of butt joint pole is the obtuse angle setting, the butt joint pole stretches into the one end rotation connection in the mounting hole and keeps away from the one end of gyro wheel at the installation pole.

Through adopting above-mentioned technical scheme, according to the diameter size of shell, adjust the interval between two gyro wheels, among the welding process for the one end centre gripping of shell is on three-jaw chuck, and the other end centre gripping of shell is between two gyro wheels, thereby has promoted the stability of shell centre gripping, makes the shell be difficult to deflect at the rotation in-process, has promoted welding quality.

Optionally, the conveying assembly comprises a mounting frame fixed on the inner wall of the second mounting groove, a round rod rotating on the mounting frame, a driving wheel rotating and connected to the mounting frame, a driven wheel rotating and connected to the mounting frame, a second servo motor fixed on the mounting frame, and a conduit fixed on the mounting frame, wherein a rotating shaft of the second servo motor is fixedly connected with a rotating shaft of the driving wheel, one end of the conduit close to the mounting frame is located above the driving wheel, and one end of the conduit far away from the mounting frame is fixed at the upper end of the welding head.

Through adopting above-mentioned technical scheme, before the welding, install the welding wire disc on the round bar in advance, pass the free end of welding wire from the laminating gap of action wheel and trailing wheel, and then penetrate the inner chamber of soldered connection from the conduit, finally wear out vertical setting down from the nozzle of soldered connection, among the welding process, start rectifier and second servo motor for the action wheel is being carried at the uniform velocity to the soldered connection with the follow driving wheel centre gripping welding wire, the welding wire passes through the nozzle in-process of soldered connection, the welding wire is melted to the electric current of rectifier, thereby realize the welding.

Optionally, a door plate used for shielding the first mounting groove is arranged on the side wall of the mounting seat in a sliding manner, an observation opening is formed in the door plate, and black glass is fixed in the observation opening.

By adopting the technical scheme, through the observation port, welding personnel can observe the welding condition of the shell in real time, so that the welding personnel can cope with sudden conditions more conveniently, and the black glass filters strong light generated in the welding process, thereby protecting glasses of the welding personnel.

The application comprises at least one of the following beneficial technical effects:

1. the whole welding process does not need manual welding around the circumferential direction of the shell, so that the welding quality of the hydraulic cylinder is improved;

2. The upper end of the mounting frame is set to be arc-shaped, so that the stability of the shell in the rotating process is improved; the abrasion between the mounting frame and the shell is reduced by arranging the rollers;

3. through setting up the observation mouth, welding personnel can observe the welding situation of shell in real time, and the welding personnel of being convenient for more deal with proruption situation.

Drawings

Fig. 1 is a schematic view of the overall structure of the prior art.

Fig. 2 is a schematic view of the overall structure of the present embodiment.

Fig. 3 is a schematic view of the overall structure of the inner cavity of the first mounting groove in the present embodiment.

Fig. 4 is a schematic view showing the overall structure of the adjusting member and the driving member in this embodiment.

Fig. 5 is an exploded view of the overall structure of the supporting member in this embodiment.

Fig. 6 is a schematic view of the overall structure of the conveying assembly in this embodiment.

Description of reference numerals: 1. a mounting seat; 2. a first mounting groove; 3. a clamping assembly; 4. welding a head; 5. an adjustment member; 6. a rectifier; 7. a second mounting groove; 8. a delivery assembly; 9. a first servo motor; 10. a three-jaw chuck; 11. a slide rail; 12. a slide base; 13. a drive member; 14. mounting a plate; 15. a lead screw; 16. a first hand wheel; 17. a connecting plate; 18. mounting a cover; 19. a worm; 20. a second hand wheel; 21. a worm gear; 22. a first bevel gear; 23. a second bevel gear; 24. a positioning gear; 25. a rack; 26. a slider; 27. a limit bolt; 28. installing a frame; 29. a support member; 30. mounting a rod; 31. a roller; 32. a butting rod; 33. mounting holes; 34. a mounting frame; 35. a round bar; 36. a driving wheel; 37. a driven wheel; 38. a second servo motor; 39. a conduit; 40. a door panel; 41. an observation port; 42. black glass; 43. a cylinder body; 44. a housing; 45. a base; 46. a base plate; 47. connecting sleeves; 48. a round table.

Detailed Description

The present application is described in further detail below with reference to figures 1-6.

The embodiment of the application discloses a welding set for pneumatic cylinder.

Referring to fig. 2, a welding set for pneumatic cylinder, includes mount pad 1, and horizontal slip has a door plant 40 on the lateral wall of mount pad 1, has seted up observation mouth 41 on the door plant 40, and welding personnel can observe the welding condition of pneumatic cylinder base 45 in real time through observing mouth 41, observes mouthful 41 internal fixation and has black glass 42.

Referring to fig. 1 and 3, a first mounting groove 2 is formed in a side wall of a mounting seat 1, a clamping assembly 3 for clamping a shell 44 to rotate is arranged in the first mounting groove 2, the clamping assembly 3 comprises a first servo motor 9 and a three-jaw chuck 10, the first servo motor 9 is fixed on the mounting seat 1, the three-jaw chuck 10 is rotatably connected to an inner wall of one side of the first mounting groove 2, and a rotating shaft of the three-jaw chuck 10 is coaxially fixed on the rotating shaft of the first servo motor 9.

Referring to fig. 2 and 3, a rectifier 6 is fixed on a side wall of a mounting seat 1, a welding head 4 with two ends communicated with the outside is arranged in a first mounting groove 2, the welding head 4 is a hollow copper tube, the welding head 4 is arranged vertically, a welding nozzle of the welding head 4 is arranged vertically downwards, the welding nozzle of the welding head 4 is electrically connected to the rectifier 6, an adjusting piece 5 for adjusting the height of the welding head 4 is arranged in the first mounting groove 2, the adjusting piece 5 comprises a slide rail 11, a slide seat 12, a driving piece 13 arranged on the slide seat 12 for driving the slide seat 12 to horizontally slide, a mounting plate 14, a lead screw 15, a first hand wheel 16 and a connecting plate 17, the slide rail 11 is arranged horizontally, the slide rail 11 is fixed between inner walls at two sides of the first mounting groove 2, the slide seat 12 is arranged on the slide rail 11 horizontally, the mounting plate 14 is arranged vertically, the mounting plate 14 is fixed on an upper surface of the slide seat 12, and an axial direction of the lead screw 15 is arranged in parallel with the vertical direction, the lead screw 15 is connected on the mounting plate 14 in a rotating mode, the first hand wheel 16 is coaxially fixed on the upper end face of the lead screw 15, the connecting plate 17 vertically slides on the side wall of the connecting plate 17, the connecting plate 17 is in threaded connection with the lead screw 15, and the welding head 4 is fixed at one end, far away from the mounting plate 14, of the connecting plate 17.

Referring to fig. 2 and 3, the driving member 13 includes a mounting cover 18, a worm 19, a second hand wheel 20, a worm wheel 21, a first bevel gear 22, a second bevel gear 23, a positioning gear 24 and a rack 25, the mounting cover 18 is fixed at an end of the sliding base 12 facing the outside, the worm 19 is rotatably connected to an inner wall of the mounting cover 18, the second hand wheel 20 is coaxially fixed to an end surface of the worm 19 extending out of the mounting cover 18, the worm wheel 21 is rotatably connected to an inner wall of the mounting cover 18, the worm wheel 21 is engaged with the worm 19, the first bevel gear 22 is coaxially fixed to a rotating shaft of the worm wheel 21, the second bevel gear 23 is rotatably connected to an upper side wall of an inner cavity of the mounting cover 18, the second bevel gear 23 is engaged with the first bevel gear 22, the positioning gear 24 is coaxially fixed to a rotating shaft of the second bevel gear 23, the rack 25 is fixed to a side wall of the sliding rail 11, and the positioning gear 24 is engaged with the rack 25.

Referring to fig. 4 and 5, a sliding block 26 slides horizontally on the sliding rail 11, a mounting frame 28 is fixed on the upper surface of the sliding block 26, the upper end of the mounting frame 28 is arc-shaped, a limit bolt 27 is connected to the mounting frame 28 in a threaded manner, the position of the sliding block 26 can be fixed by the limit bolt 27, an arc concave surface at the upper end of the mounting frame 28 is vertically arranged upwards, support members 29 for reducing abrasion between the mounting frame 28 and a shell 44 are arranged on both sides of the mounting frame 28, each support member 29 comprises a mounting rod 30, a roller 31 and a butting rod 32, mounting holes 33 which are obliquely arranged are arranged on both sides of the mounting frame 28, an axial included angle of the two mounting holes 33 is obtuse, the height of one end of the arc concave surface of the mounting frame 28, which is communicated with the mounting hole 33, is greater than the height of the other end, the mounting rod 30 slides in the mounting hole 33 along the axial direction of the mounting hole 33, the roller 31 is rotatably connected to the mounting rod 30, the two rollers 31 are both located in the arc concave cavity at the upper end of the mounting frame 28, the abutting rod 32 is in threaded connection with the inner wall of the mounting hole 33, and one end of the abutting rod 32 extending into the mounting hole 33 is rotatably connected with one end of the mounting rod 30 far away from the roller 31.

Referring to fig. 3 and 6, a second mounting groove 7 is formed in one side of the mounting seat 1, which faces away from the first mounting groove 2, a conveying assembly 8 for conveying a welding wire into a welding nozzle is arranged in the second mounting groove 7, the conveying assembly 8 includes a mounting frame 34, a round bar 35, a driving wheel 36, a driven wheel 37, a second servo motor 38 and a conduit 39, the mounting frame 34 is fixed on the inner wall of the second mounting groove 7, the round bar 35 is rotatably connected to the mounting frame 34, the round bar 35 is used for mounting a welding wire reel, the second servo motor 38 is fixed on the mounting frame 34, the driving wheel 36 is rotatably connected to the mounting frame 34, the driven wheel 37 is rotatably connected to the mounting frame 34, the round bar 35 is located below the driving wheel 36 and the driven wheel 37, the rotating shaft of the driving wheel 36 is coaxially and fixedly connected with the rotating shaft of the second servo motor 38, the conduit 39 is fixed on the mounting frame 34, one end of the conduit 39 is located above the driving wheel 36, the conduit 39 is a corrugated pipe made of plastic, one end of the conduit 39, which is far away from the mounting frame 34, is fixed at the upper end of the welding head 4, and the conduit 39 is communicated with the inner cavity of the welding head 4.

The implementation principle of the welding device for the hydraulic cylinder in the embodiment of the application is as follows: the welding wire coil is arranged on the round rod 35 in advance, so that welding wires are clamped between the driving wheel 36 and the driven wheel 37 and sequentially pass through the wire guide pipe 39 and the welding head 4, the welding wires penetrate out of a welding nozzle of the welding head 4, the shell 44 is assembled with the base 45 in advance, the circular truncated cone 48 is embedded in the shell 44, the assembled shell 44 is clamped on the three-jaw chuck 10, the contact part of the circular truncated cone 48 and the outside is located right below the welding head 4, the welding nozzle is in contact with the welding part, the rotating speed of the first servo motor 9 is set, the first servo motor 9 is started, the rectifier 6 and the second servo motor 38 are started simultaneously, the welding head 4 melts down the welding wires in the synchronous rotating process of the shell 44 and the three-jaw chuck 10, welding around the shell 44 is achieved, and welding is convenient.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A welding device for a hydraulic cylinder, characterized in that: comprises an installation seat (1), a first installation groove (2) is arranged on one side of the installation seat (1), one end of the first mounting groove (2) is provided with a clamping component (3) for clamping the shell (44) to rotate, a welding head (4) which is arranged in a hollow way is arranged in the first mounting groove (2), both ends of the welding head (4) are communicated with the outside, a welding nozzle of the welding head (4) is arranged vertically downwards, an adjusting piece (5) for adjusting the height of the welding head (4) is arranged in the first mounting groove (2), a rectifier (6) is fixed on the side wall of the mounting seat (1), a welding nozzle of the welding head (4) is electrically connected to the rectifier (6) through a lead, a second mounting groove (7) is arranged on one side of the mounting seat (1) deviating from the first mounting groove (2), a conveying assembly (8) for conveying welding wires to a welding nozzle is arranged in the second mounting groove (7);

The clamping assembly (3) comprises a first servo motor (9) fixed on the mounting base (1) and a three-jaw chuck (10) coaxially fixed on a rotating shaft of the first servo motor (9), and one end, far away from the base (45), of the shell (44) is clamped on the three-jaw chuck (10);

the adjusting part (5) comprises a sliding rail (11) fixed in the first mounting groove (2), a sliding seat (12) sliding on the sliding rail (11), a driving part (13) arranged on the sliding seat (12) and used for driving the sliding seat (12) to horizontally slide, a mounting plate (14) fixed on the upper surface of the sliding seat (12) and vertically arranged, a lead screw (15) rotating on one side of the mounting plate (14) facing the welding head (4), a first hand wheel (16) coaxially fixed at the upper end of the lead screw (15), and a connecting plate (17) sliding on the mounting plate (14), wherein the lead screw (15) is vertically arranged, the connecting plate (17) is in threaded connection with the lead screw (15), and the welding head (4) is fixed at one end, far away from the mounting plate (14), of the connecting plate (17);

the driving piece (13) comprises an installation cover (18) fixed at one end of the sliding seat (12) facing the outside, a worm (19) rotating on the inner wall of the installation cover (18), a second hand wheel (20) coaxially fixed at one end of a rotating shaft of the worm (19) extending out of the installation cover (18), a worm wheel (21) rotating on the inner wall of the installation cover (18), a first bevel gear (22) coaxially fixed on the rotating shaft of the worm wheel (21), a second bevel gear (23) rotating on the inner wall of the installation cover (18), a positioning gear (24) coaxially fixed on the rotating shaft of the second bevel gear (23), and a rack (25) fixed on one side, close to the installation cover (18), of the sliding rail (11), wherein the worm (19) is meshed with the worm wheel (21), the first bevel gear (22) is meshed with the second bevel gear (23), and the positioning gear (24) is meshed with the rack (25);

A sliding block (26) slides on the sliding rail (11), an installation frame (28) is fixed on the upper surface of the sliding block (26), a limiting bolt (27) is connected to the installation frame (28) in a threaded manner, the upper end of the installation frame (28) is arc-shaped, and supporting pieces (29) used for reducing abrasion between the installation frame (28) and the shell (44) are arranged on two sides of the installation frame (28);

support piece (29) including slide installation pole (30) on installing frame (28), rotate gyro wheel (31), the butt joint pole (32) of threaded connection on installing frame (30) on installing pole (30), mounting hole (33) that are the slope setting are all seted up to the both sides of installing frame (28), the one end height that mounting hole (33) communicate installing frame (28) upper end outer wall is greater than the other end height, installation pole (30) slide in mounting hole (33), two the contained angle of butt joint pole (32) is the obtuse angle setting, the one end rotation that the pole (32) stretched into in mounting hole (33) is connected the one end of keeping away from gyro wheel (31) in installing pole (30).

2. A welding device for hydraulic cylinders according to claim 1, characterized in that: conveying component (8) including fixing mounting bracket (34) on second mounting groove (7) inner wall, rotating round bar (35) on mounting bracket (34), rotate action wheel (36) of connecting on mounting bracket (34), rotate driven wheel (37) of connecting on mounting bracket (34), fix second servo motor (38) on mounting bracket (34), fix wire conduit (39) on mounting bracket (34), the coaxial fixed connection of pivot and the pivot of action wheel (36) of second servo motor (38), wire conduit (39) are close to the one end of mounting bracket (34) and are located the top of action wheel (36), the upper end at soldered connection head (4) is fixed to the one end that mounting bracket (34) was kept away from in wire conduit (39).

3. A welding device for hydraulic cylinders according to claim 1, characterized in that: the door panel (40) that is used for sheltering from first mounting groove (2) slides on the lateral wall of mount pad (1), observation mouth (41) have been seted up on door panel (40), it has black glass (42) to observe mouth (41) internal fixation.