CN216359393U - Welding tool for crank arm - Google Patents

Abstract

The application relates to a welding frock for connecting lever relates to frock clamp's field, and it includes the base, be equipped with the spacing subassembly that compresses tightly the subassembly, be used for fixed vertical pipe that is used for fixed connection ring on the base respectively. This application is through fixing go-between and vertical pipe, and the personnel of being convenient for weld between L type pipe and sleeve pipe, L type pipe and the vertical pipe, have improved welding efficiency's effect.

Description

Welding tool for crank arm

Technical Field

The application relates to the field of tools, in particular to a welding tool for a crank arm.

Background

A tool is a device for fixing a processing object, also called a jig, in a machine manufacturing process. When a workpiece is machined on a machine tool, the workpiece needs to be positioned and clamped before machining in order to enable the surface of the workpiece to meet the technical requirements of the size, the geometric shape, the matching precision with other surfaces and the like specified in the drawing.

Referring to fig. 1, a deflection corrector crank arm in the related art includes an L-shaped pipe 311, a sleeve pipe 312 and a connecting pipe 313, wherein the sleeve pipe 312 includes a horizontal pipe 3121 and a vertical pipe 3122 which are communicated with each other, one end of the L-shaped pipe 311 is inserted into the horizontal pipe 3121, the other end of the L-shaped pipe 311 is inserted into the connecting pipe 313, and a connecting ring 314 is disposed on a side wall of the connecting pipe 313.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: personnel when the welding, take place the skew easily between sleeve pipe and the L type union coupling, connecting pipe and the L type pipe, consequently in welding process, need artifical position of adjusting the L type pipe many times, it is consuming time hard, reduced welding efficiency.

SUMMERY OF THE UTILITY MODEL

In order to improve the problem that the welding efficiency is influenced by the inconvenience of personnel welding L-shaped pipes, the application provides a welding tool for a crank arm.

The application provides a welding frock for connecting lever adopts following technical scheme:

the utility model provides a turning arm is with welding frock, includes the base, be equipped with the spacing subassembly that compresses tightly the subassembly that is used for fixed go-between, is used for fixed vertical pipe on the base respectively, compress tightly the subassembly including setting up a supporting bench on the base, setting up the bracket that holds on a supporting bench, the bracket that holds is used for supporting the go-between, be equipped with on the supporting bench and be used for compressing tightly the setting element on the bracket with the go-between.

Through adopting above-mentioned technical scheme, add man-hour, place the go-between earlier on the support bracket, utilize the setting element to compress tightly the go-between on the support bracket, realized fixed to the go-between, recycle spacing subassembly and fix vertical pipe on the base to with L type pipe remain stable, and then in welding process, do not need the position of artifical adjustment L type pipe, labour saving and time saving has improved welding efficiency.

Optionally, the support bracket is provided with a limiting block and a limiting strip, and a positioning space for accommodating the connecting ring is formed between the limiting block and the limiting strip in a surrounding manner.

Through adopting above-mentioned technical scheme, through setting up stopper and spacing, play the positioning action to the position that the go-between is located the support bracket, the personnel of being convenient for weld L type pipe and the juncture between the go-between, have improved welding efficiency.

Optionally, a sliding seat is arranged on the base, and a sliding groove matched with the sliding seat is formed in the lower surface of the supporting table.

Through adopting above-mentioned technical scheme, the cooperation of slide and spout can be according to the length and size of the horizontal end of L type pipe, can with a supporting bench cunning to suitable position, and then can place the go-between on bearing the bracket to utilize and compress tightly the subassembly and compress tightly the go-between on bearing the bracket, the personnel of being convenient for weld.

Optionally, a fixing seat is arranged on the supporting table, a vertical rod is arranged on the upper surface of the fixing seat, and an arc plate used for supporting the horizontal end of the L-shaped pipe is arranged at the top end of the vertical rod.

Through adopting above-mentioned technical scheme, the cooperation of pole setting and arc layer board plays the supporting role to the horizontal end of L type pipe for the position between L type pipe and sleeve pipe or the horizontal pipe remains stable, the personnel of being convenient for weld.

Optionally, the limiting assembly comprises a support column arranged on the base and a support plate arranged at the top of the support column, a support member for supporting the vertical pipe is arranged on the support plate, and a locking member for fixing the vertical pipe on the support member is arranged on the support plate.

Through adopting above-mentioned technical scheme, at first utilize support piece to support vertical pipe, recycle the locking piece and fix vertical pipe in the backup pad, realized the location to vertical pipe.

Optionally, the support member includes a support column, and an insertion block for insertion into the vertical pipe is arranged at the top of the support column.

Through adopting above-mentioned technical scheme, utilize the support column to support vertical pipe, insert the inserted block simultaneously in vertical pipe, play the effect of location to the position that vertical pipe is located the support column.

Optionally, the bottom of the support column is provided with a screw rod, the support plate is provided with a mounting hole, and one end of the screw rod, which is far away from the support column, penetrates through the mounting hole and is in threaded connection with a fixing nut.

Through adopting above-mentioned technical scheme, the cooperation of screw rod and nut has realized being connected dismantled between support column and the backup pad, makes things convenient for personnel to adjust the support column to suitable height according to the height dimension of the vertical end of L type pipe for the support column can the vertical pipe of stable support.

Optionally, the supporting member includes a supporting block arranged on the upper surface of the supporting plate and a supporting plate located on the supporting block, and a positioning block inserted into the vertical pipe is connected to the upper surface of the supporting plate through a thread;

the inside of tray is equipped with the cavity, the inside wall of cavity rotates and is connected with the driving gear, the lateral wall of tray is equipped with the regulation mouth that is linked together with the cavity, the partial lateral wall of driving gear passes the regulation mouth and stretches out outside the lateral wall of tray, just be located one side meshing of driving gear in the cavity and be connected with driven gear, threaded connection has the lead screw on the driven gear, the roof of tray is equipped with the lift hole, the top of lead screw is passed the lift hole and is linked to each other with the lower surface of layer board, the pore wall in lift hole is equipped with the guide block, the lateral wall of lead screw just is equipped with the guide way that supplies the guide block to slide along self axial.

Through adopting above-mentioned technical scheme, rotatory driven gear drives the driving gear and rotates, because the cooperation of guide block and guide way, play limiting displacement to the lift of lead screw, and then along with the rotation of driving gear, drive the lead screw and go up and down, drive the layer board through the lead screw and go up and down, finally can be according to the height dimension of the vertical end of L type pipe, adjust the height dimension of locating piece to suitable height, and then through the height of adjusting the locating piece, can establish vertical pipe box on the back shaft, finally realized the location to vertical pipe.

Optionally, the locking piece comprises a positioning plate arranged on the supporting plate, and a power piece used for pressing the positioning plate on the vertical pipe is arranged on the supporting plate.

Through adopting above-mentioned technical scheme, utilize the power spare to compress tightly the locating plate at the top of vertical pipe, and then can be with vertical pipe stable fixation in the backup pad.

Optionally, the limiting assembly comprises a stand column arranged on the base, a lifting groove is formed in the side wall of the stand column and is arranged along the height direction of the stand column, an electric cylinder is installed in the lifting groove, a piston rod of the electric cylinder is connected with a lifting block, a cross beam is arranged on the side wall of the lifting block, a fixing block inserted into the vertical pipe is arranged on the lower surface of the cross beam, a supporting beam used for supporting the vertical pipe is arranged on the side wall of the stand column, and the lower surface of the cross beam is abutted to the top surface of the vertical pipe.

Through adopting above-mentioned technical scheme, place vertical pipe on the joist, the electric jar that restarts drives the elevator and moves down in the lift groove to establish the stopper in vertical pipe with inserting, the lower surface butt of crossbeam can fix vertical pipe on the joist simultaneously, has realized the location to vertical pipe on the roof wall of vertical pipe.

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

1. by fixing the connecting ring and the vertical pipe, the L-shaped pipe can be kept stable in the welding process, the position of the L-shaped pipe does not need to be adjusted manually, time and labor are saved, and the welding efficiency is improved;

2. the two groups of pressing assemblies are arranged, so that two stations for welding and processing the L-shaped pipe are arranged on the base, and the welding efficiency is improved;

3. set up screw rod and nut, make things convenient for personnel according to the height dimension of the vertical end of L type pipe, adjust the support column to suitable height for the support column can the vertical pipe of stable support.

Drawings

Fig. 1 is a schematic view of the overall structure of a deflection corrector crank arm in the background art.

Fig. 2 is a schematic view of the overall structure of a welding tool for a crank arm in embodiment 1 of the present application.

Fig. 3 is a sectional view taken along line a-a of fig. 2.

Fig. 4 is a view taken along direction a in fig. 3.

Fig. 5 is a schematic view of the overall structure of a welding tool for a crank arm in embodiment 2 of the present application.

Fig. 6 is a sectional view taken along line B-B in fig. 5.

Fig. 7 is a view taken along direction B in fig. 6.

Fig. 8 is a schematic view of the overall structure of a welding tool for a crank arm in embodiment 3 of the present application.

Fig. 9 is a sectional view taken along line C-C in fig. 8.

Fig. 10 is a view taken along direction C in fig. 9.

Description of reference numerals: 1. a base; 2. a compression assembly; 201. a support table; 202. a support bracket; 203. a positioning member; 3. a limiting component; 301. a pillar; 302. a support plate; 33. a support member; 331. a support pillar; 332. inserting a block; 333. a screw; 334. mounting holes; 335. fixing a nut; 34. a locking member; 341. a saddle; 342. positioning a plate; 343. a power member; 4. a limiting block; 5. a limiting strip; 6. a slide base; 7. a chute; 8. a fixed seat; 9. erecting a rod; 10. an arc-shaped plate; 11. a support block; 12. a support plate; 13. positioning blocks; 14. a cavity; 15. a driving gear; 16. a screw rod; 17. a lifting hole; 18. a guide block; 19. a guide groove; 20. a driven gear; 21. an adjustment port; 22. supporting a block; 23. an arc-shaped slot; 24. a column; 25. a cross beam; 26. a fixed block; 27. a joist; 28. a lifting groove; 29. a lifting block; 30. an electric cylinder; 31. a deflection corrector crank arm; 311. an L-shaped pipe; 312. a sleeve; 3121. a horizontal tube; 3122. a vertical tube; 313. a connecting pipe; 314. and (7) connecting rings.

Detailed Description

The present application is described in further detail below with reference to figures 2-10.

The embodiment of the application discloses a welding tool for a crank arm.

Example 1

Referring to fig. 2, the welding tool for the crank arm comprises a rectangular base 1, a limiting assembly 3 for limiting two vertical pipes 3122 is arranged on the base 1, and pressing assemblies 2 for fixing a connecting ring 314 are arranged on the base 1 and positioned at two sides of the limiting assembly 3; utilize spacing subassembly 3 can fix two vertical pipes 3122 simultaneously, utilize two sets of subassemblies 2 that compress tightly to compress tightly fixedly respectively two go-between 314, and then can fix a position two L type pipes 311 simultaneously, make things convenient for personnel to L type pipe 311 respectively with horizontal pipe 3121, the welding between the sleeve pipe 312, and in welding process, do not need artifical position of adjusting L type pipe 311 many times, improved welding efficiency.

Referring to fig. 2 and 3, a sliding seat 6 is fixedly arranged on the upper surface of the base 1, the width dimension of the sliding seat 6 is smaller than that of the base 1, the pressing assembly 2 comprises a supporting table 201 arranged on the sliding seat 6, a sliding groove 7 in sliding fit with the sliding seat 6 is arranged on the lower surface of the supporting table 201, and the supporting table 201 slides on the sliding seat 6; during the installation, according to the length dimension of the horizontal end of L type pipe 311, with the length direction sliding of brace table 201 along slide 6 to suitable position, the accessible compresses tightly subassembly 2 this moment and compresses tightly fixed to go-between 314, and through the interval between adjustment brace table 201 and the spacing subassembly 3, is convenient for fix the L type pipe 311 of different specifications, and application scope is wide.

Referring to fig. 3, a support bracket 202 is arranged on a support table 201, the support bracket 202 is placed on the support table 201, the support bracket 202 is a frame plate with a door-shaped longitudinal section, two vertical ends of the support bracket 202 abut against the upper surface of the support table 201, a connection ring 314 is placed on the upper surface of the horizontal end of the support bracket 202, the upper surface of the horizontal end of the support bracket 202 is respectively welded with a limit block 4 and a limit strip 5, the central axis of the limit block 4 is perpendicular to the central axis of the limit strip 5, a positioning space for limiting the connection ring 314 is formed between the limit block 4 and the limit strip 5 in a surrounding manner, the limit block 4 abuts against one side wall of the connection ring 314, and the limit strip 5 abuts against the side wall of the connection ring 314 adjacent to the side wall of the limit block 4; the position of the connecting ring 314 on the support bracket 202 is jointly positioned by the limiting block 4 and the limiting strip 5, so that the pressing assembly 2 can press and fix the connecting ring 314 on the support bracket 202 conveniently.

Referring to fig. 3, the supporting platform 201 is provided with a positioning member 203 for pressing the connecting ring 314 against the supporting bracket 202, in this embodiment, the positioning member 203 is an elbow clamp, and the elbow clamp is fixed on the upper surface of the supporting platform 201 by screws; during installation, the person rotates the handle of the elbow clip toward the side of the support bracket 201, and the connecting ring 314 is pressed against the support bracket 202 by the pressing plate of the elbow clip, so as to position the connecting ring 314.

Referring to fig. 3, a fixing seat 8 is arranged on the upper surface of a sliding seat 6, the fixing seat 8 is formed by integrally forming an upper transverse plate, a lower transverse plate and a vertical plate, the vertical plate is located between the upper transverse plate and the lower transverse plate, the lower transverse plate abuts against the upper surface of the sliding seat 6, threads are arranged on the side wall of the lower end of an upright rod 9, the lower end of the upright rod 9 is in threaded connection with the upper transverse plate, an arc plate 10 used for supporting the horizontal end of an L-shaped pipe 311 is fixedly connected to the top end of the upright rod 9, and the upright rod 9 and the arc plate 10 play a supporting role in supporting the horizontal end of the L-shaped pipe 311, so that the distance between the L-shaped pipe 311 and a sleeve 312 and the distance between the L-shaped pipe 311 and a vertical pipe 3122 are kept stable, and welding by personnel is facilitated; and through setting up pole setting 9 and last horizontal plate threaded connection, conveniently according to the height dimension of the vertical end of L type pipe 311, adjust the arc 10 to suitable height for the arc 10 can be to the stable support of the horizontal end of L type pipe 311.

Referring to fig. 3 and 4, the limiting assembly 3 includes a supporting column 301 welded to the upper surface of the base 1, the supporting column 301 is located between two supporting tables 201, a horizontally disposed supporting plate 302 is fixedly disposed on the top of the supporting column 301, two sets of supporting members 33 oppositely disposed are disposed on the supporting plate 302, the supporting members 33 are used for supporting the vertical pipe 3122, and a locking member 34 for fixing the vertical pipe 3122 on the supporting members 33 is disposed on the supporting plate 302.

Referring to fig. 4, the supporting member 33 includes a supporting column 331 vertically disposed on the supporting plate 302, an insertion block 332 is fixedly disposed at the top of the supporting column 331, a cross section of the insertion block 332 is rectangular, the insertion block 332 is adapted to be inserted into the vertical tube 3122, after the insertion block 332 is inserted into the vertical tube 3122, a bottom wall of the vertical tube 3122 abuts against an upper surface of the supporting column 331, the vertical tube 3122 is supported by the supporting column 331, the vertical tube 3122 is positioned by the insertion block 332, and thus the vertical tube 3122 can be stably maintained.

In this embodiment, a screw 333 is fixedly welded to the bottom of the supporting column 331, a central axis of the screw 333 is collinear with a central axis of the supporting column 331, a mounting hole 334 is formed in the supporting plate 302, the bottom end of the screw 333 penetrates through the mounting hole 334 and is in threaded connection with a fixing nut 335, and the fixing nut 335 abuts against the lower surface of the supporting plate 302; the detachable connection between the supporting column 331 and the supporting plate 302 is realized by the cooperation of the fixing nut 335 and the screw 333, and meanwhile, the height of the supporting column 331 can be adjusted according to the height dimension of the vertical end of the L-shaped pipe 311, so that the supporting column 331 can stably support the vertical pipe 3122.

Referring to fig. 4, the locking member 34 includes a tray 341 with a door-shaped longitudinal section, the bottom walls of the vertical ends of the two sides of the tray 341 are welded and fixed on the upper surface of the supporting plate 302, a power member 343 is mounted on the upper surface of the horizontal end of the tray 341, the power member 343 is also an elbow clamp, a positioning plate 342 is connected to the pressure plate of the elbow clamp through a split bolt, a handle of the elbow clamp is rotated to adjust the positioning plate 342 to a horizontal position, and then two vertical tubes 3122 can be pressed and fixed on the supporting plate 302 through the positioning plate 342, so that the fixation of the vertical tubes 3122 is realized.

The implementation principle of the embodiment 1 is as follows: during processing, the support platform 201 is slid on the slide carriage 6 to a proper position according to the length of the horizontal end of the L-shaped pipe 311, and then the connection ring 314 is placed on the support bracket 202, so that the side wall of one side of the connection ring 314 abuts against the side wall of the limit block 4, and the other side wall of the connection ring 314 abuts against the side wall of the limit strip 5, and at this time, the connection ring 314 can be pressed on the support bracket 202 through the toggle clamp on the support bracket 202.

Meanwhile, the vertical pipe 3122 is sleeved on the insert block 332, the bottom wall of the vertical pipe 3122 abuts against the top wall of the support column 331, then the positioning plate 342 is driven to move downwards through the elbow clamp on the supporting table 341 until the lower surface of the positioning plate 342 abuts against the upper surface of the vertical pipe 3122, the vertical pipe 3122 is supported on the support column 331, positioning of the vertical pipe 3122 is achieved, at the moment, personnel can respectively weld the connection junction between the L-shaped pipe 311 and the sleeve 312 and the connection junction between the L-shaped pipe 311 and the vertical pipe 3122, and therefore in the welding process, the position of the L-shaped pipe 311 does not need to be adjusted manually for multiple times, and the welding efficiency is improved.

Example 2

Referring to fig. 5 and 6, the present embodiment is different from embodiment 1 in that the structure of the support 33 is different.

Referring to fig. 6 and 7, the supporting member 33 includes a supporting block 11 fixedly disposed on the supporting plate 302, a cavity 14 is disposed inside the supporting block 11, a driving gear 15 is disposed in the cavity 14, an axis of a side wall of the driving gear 15 is rotatably connected to an inner side wall of the cavity 14 through a rotating shaft, an adjusting opening 21 communicated with the cavity 14 is disposed on a side wall of the supporting block 11, the adjusting opening 21 is disposed in an arc shape, and a part of a side wall of the driving gear 15 penetrates through the adjusting opening 21 and extends out of the side wall of the supporting block 11, so that a person can rotate the driving gear 15.

In the cavity 14 and be located one side meshing of driving gear 15 and be connected with driven gear 20, the fixed piece 22 that is equipped with of inside wall of cavity 14, a lateral wall of piece 22 is equipped with arc wall 23, and driven gear 20's partial lateral wall stretches into in the arc wall 23, plays supporting role to driven gear 20 through a piece 22, and then driven gear 20 can with driving gear 15 stable meshing.

The lateral wall axle center department of driven gear 20 is equipped with the screw hole, screw hole female connection has lead screw 16, the vertical setting of lead screw 16, the lateral wall of lead screw 16 just is equipped with guide way 19 along self axial, the roof of tray 11 is equipped with the lift hole 17 that is linked together with cavity 14, the top of lead screw 16 is passed lift hole 17 and is stretched out the upper surface of tray 11, the pore wall of lift hole 17 is equipped with guide block 18, the cooperation of sliding between guide block 18 and the guide way 19 for lead screw 16 can be followed self axial and gone up and down and slide.

The top of tray 11 is equipped with layer board 12 that the level set up, the lower surface of layer board 12 and the top fixed connection of lead screw 16, the upper surface threaded connection of layer board 12 has locating piece 13, locating piece 13's transversal rectangle setting of personally submitting, locating piece 13 is used for inserting the inside of establishing at vertical pipe 3122, locating piece 13 threaded connection is at the upper surface of layer board 12, the dismantled connection between locating piece 13 and the vertical pipe 3122 has been realized, so that according to the vertical pipe 3122 of different dimensions, change the locating piece 13 of corresponding specification.

The implementation principle of the embodiment 2 is as follows: during installation, firstly, according to the height of the vertical end of the L-shaped pipe 311, the driven driving gear 20 is rotated to drive the driving gear 15 to rotate, and as the guide block 18 and the guide groove 19 play a role in guiding and limiting the lifting of the screw rod 16, the screw rod 16 is driven to lift along with the rotation of the driving gear 15, and then the supporting plate 12 is driven to lift, so that the supporting plate 12 is adjusted to a proper height.

Then establish vertical pipe 3122 cover on locating piece 13, fix a position vertical pipe 3122 through locating piece 13 to with the diapire butt of vertical pipe 3122 at the upper surface of layer board 12, realized the support to vertical pipe 3122, and then through locating plate 342, can tightly support vertical pipe 3122 on layer board 12, so that keep stable with L type pipe 311, improved personnel to L type pipe 311 and vertical pipe 3122, the stability of juncture welding process between connecting pipe 314.

Example 3

Referring to fig. 8 and 9, the present embodiment is different from embodiment 1 in the structure of the spacing assembly 3.

Referring to fig. 9 and 10, the limiting assembly 3 includes a column 24 fixedly disposed on the base 1, the column 24 is provided with a lifting groove 28 facing the side wall of the slide carriage 6 and axially disposed thereon, a lifting block 29 is slidably disposed in the lifting groove 28, an electric cylinder 30 is disposed in the lifting groove 28, a cylinder body of the electric cylinder 30 is mounted on the top wall of the lifting groove 28, a piston rod of the electric cylinder 30 is connected to the top wall of the lifting block 29, a telescopic direction of the piston rod of the electric cylinder 30 is a vertical direction, the electric cylinder 30 is started, and the lifting block 29 is driven to slide in the lifting groove 28.

Referring to fig. 10, a horizontally arranged cross beam 25 is fixedly arranged on the side wall of the lifting block 29, two fixing blocks 26 are fixedly arranged on the lower surface of the cross beam 25 and are used for being inserted into the vertical pipe 3122, the fixing blocks 26 are rectangular blocks, the two fixing blocks 26 are arranged oppositely along the length direction of the base 1, a joist 27 is fixedly arranged on the side wall of the upright post 24 and below the cross beam 25, the joist 27 is used for supporting the vertical pipe 3122, the vertical pipe 3122 is placed on the joist 27, the fixing blocks 26 are driven to move downwards along with the downward movement of the cross beam 25, the fixing blocks 26 can be inserted into the vertical pipe 3122, so that the vertical pipe 3122 is fixed on the joist 27, and the fixing of the vertical pipe 3122 is realized.

The implementation principle of the embodiment 3 is as follows: during installation, the vertical pipe 3122 is sleeved on the fixed block 26, so that the bottom wall of the vertical pipe 3122 abuts against the joist 27, and at the moment, the vertical pipe 3122 is supported by the joist 27; then the electric cylinder 30 is started, the lifting block 29 is driven to move downwards in the lifting groove 28, the lifting block 29 drives the cross beam 25 to move downwards synchronously, the fixing block 26 can be inserted into the vertical pipe 3122 until the lower surface of the cross beam 25 abuts against the top wall of the vertical pipe 3122, the vertical pipe 3122 is fixed, the L-shaped pipe 311 is kept stable, and the stability of a person in the welding process of the junction between the L-shaped pipe 311 and the vertical pipe 3122 and the connecting pipe 314 is improved.

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 (10)

1. The utility model provides a turning arm is with welding frock which characterized in that: including base (1), be equipped with respectively on base (1) and be used for fixed connecting ring (314) compress tightly subassembly (2) and be used for fixed vertical pipe (3122) spacing subassembly (3), compress tightly subassembly (2) including setting up supporting bench (201) on base (1), support bracket (202) of setting on supporting bench (201), support bracket (202) are used for supporting connecting ring (314), be equipped with on supporting bench (201) and be used for compressing tightly setting element (203) on support bracket (202) with connecting ring (314).

2. The welding tool for the crank arm as claimed in claim 1, wherein: the supporting bracket (202) is provided with a limiting block (4) and a limiting strip (5) respectively, and a positioning space for accommodating the connecting ring (314) is formed between the limiting block (4) and the limiting strip (5) in a surrounding manner.

3. The welding tool for the crank arm as claimed in claim 1, wherein: the base (1) is provided with a sliding seat (6), and the lower surface of the supporting table (201) is provided with a sliding groove (7) matched with the sliding seat (6).

4. The welding tool for the crank arm as claimed in claim 1, wherein: the supporting platform (201) is provided with a fixed seat (8), the upper surface of the fixed seat (8) is provided with a vertical rod (9), and the top end of the vertical rod (9) is provided with an arc-shaped plate (10) used for supporting the horizontal end of the L-shaped pipe (311).

5. The welding tool for the crank arm as claimed in claim 1, wherein: spacing subassembly (3) including setting up pillar (301) on base (1), setting up backup pad (302) at pillar (301) top, be equipped with support piece (33) that are used for supporting vertical pipe (3122) on backup pad (302), be equipped with on backup pad (302) and be used for fixing locking piece (34) on support piece (33) with vertical pipe (3122).

6. A welding frock for connecting lever according to claim 5 characterized in that: the support (33) comprises a support column (331), and an insertion block (332) for being inserted into the vertical pipe (3122) is arranged at the top of the support column (331).

7. A welding frock for connecting lever according to claim 6 characterized in that: the bottom of support column (331) is equipped with screw rod (333), be equipped with mounting hole (334) on backup pad (302), mounting hole (334) and threaded connection have fixation nut (335) are passed to the one end that support column (331) was kept away from in screw rod (333).

8. A welding frock for connecting lever according to claim 5 characterized in that: the supporting piece (33) comprises a supporting block (11) arranged on the upper surface of the supporting plate (302) and a supporting plate (12) positioned above the supporting block (11), and a positioning block (13) inserted into the vertical pipe (3122) is in threaded connection with the upper surface of the supporting plate (12);

a cavity (14) is arranged in the support block (11), the inner side wall of the cavity (14) is rotatably connected with a driving gear (15), the side wall of the supporting block (11) is provided with an adjusting opening (21) communicated with the cavity (14), part of the side wall of the driving gear (15) passes through the adjusting opening (21) and extends out of the side wall of the support block (11), a driven gear (20) is connected in the cavity (14) and positioned at one side of the driving gear (15) in a meshing way, a screw rod (16) is connected to the driven gear (20) in a threaded manner, a lifting hole (17) is arranged on the top wall of the supporting block (11), the top end of the screw rod (16) passes through the lifting hole (17) and is connected with the lower surface of the supporting plate (12), the hole wall of the lifting hole (17) is provided with a guide block (18), and the side wall of the screw rod (16) is provided with a guide groove (19) for the guide block (18) to slide along the self axial direction.

9. A welding frock for connecting lever according to claim 5 characterized in that: the locking piece (34) comprises a positioning plate (342) arranged on the supporting plate (302), and a power piece (343) used for pressing the positioning plate (342) on the vertical pipe (3122) is arranged on the supporting plate (302).

10. The welding tool for the crank arm as claimed in claim 1, wherein: spacing subassembly (3) is including setting up stand (24) on base (1), the lateral wall of stand (24) and be equipped with lift groove (28) along self direction of height, install electric jar (30) in lift groove (28), the piston rod of electric jar (30) is connected with elevator block (29), be equipped with crossbeam (25) on the lateral wall of elevator block (29), the lower surface of crossbeam (25) is equipped with fixed block (26) that are used for inserting in vertical pipe (3122), be equipped with on the lateral wall of stand (24) and be used for supporting joist (27) of vertical pipe (3122), the lower surface butt of crossbeam (25) is at the top surface of vertical pipe (3122).

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