A device for automatic welding of steering yoke

Abstract

The present invention provides a device for automatic welding of steering yokes, belonging to the technical field of positioning fixtures. It solves the problem that the clamping and positioning of existing yoke welding machines are troublesome and the positioning accuracy is not high. The device includes a reduction motor with an output shaft, a sleeve and a push rod, a slider is sleeved on the push rod and the slider is circumferentially fixed to the push rod, a blocking portion is provided at the port of the sleeve, a spring is provided on the push rod outer sleeve, and one end of the spring presses on the slider to make it abut against the blocking portion, the slider is also provided with a clamping joint extending out of the sleeve for cooperating with the center hole of the yoke, a travel groove is provided on the clamping joint and the push rod can extend into the travel groove, the device also includes a positioning column inserted into the travel groove and the diameter of the positioning column is slightly smaller than the width of the travel groove, when the slider slides relative to the push rod, the push rod can extend into the travel groove and push the positioning column to slide. The device has good stability during processing and the welding accuracy is greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of positioning fixtures and relates to a device, in particular to a device for automatic welding of steering yokes. Background Art

[0002] The steering yoke for automobiles includes a yoke and a shaft. The yoke includes a center hole and two symmetrical ear seats. The two ear seats are respectively provided with two holes of the same size that pass through the center line. The two holes are used to connect with the yoke arm. The diameter of the shaft is generally larger than that of the yoke. The connection between the yoke and the shaft usually requires that one end of the shaft be inserted into the center hole of the yoke, and then the connection between the two is welded and fixed. Since the yoke is an irregular workpiece and the shaft is cylindrical, the existing welding methods are all performed manually. The problems associated with manual welding include low welding speed, low productivity, and high production costs due to the large amount of labor used.

[0003] Later, with the advancement of science and technology, some people invented an automatic welding machine for yokes and shafts. For example, the flat tube and yoke welding machine for electric steering shafts introduced in the application number: 201721092946.0 has a speed reducer at one end of the operation panel, and a fixture for clamping the yoke on the speed reducer motor. Then the other end presses the shaft into the center hole of the yoke through the end face of the cylinder top pressure shaft, and the welding position between the yoke and the shaft is welded by the welding gun located at the rotation of the speed reducer motor and next to the speed reducer motor. However, since the yoke is a special-shaped workpiece, it is more troublesome to position and clamp it, and the fixture plays a positioning role by clamping the two ear seats of the yoke in the square groove. In this way, the yoke is easy to deviate toward the direction of one ear seat during processing, and its positioning stability is poor, which makes the matching accuracy of the shaft and the center hole of the yoke not high, and the defective rate of the welded yoke shaft is high, which is not conducive to production promotion. Therefore, solving the above-mentioned problems is an urgent matter to be dealt with at present. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems in the prior art and to propose a device for automatic welding of steering yokes, which solves the technical problem that the clamping and positioning of the existing yoke welding machine is relatively troublesome and the positioning accuracy is not high.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A device for automatic welding of a steering yoke, the device includes a reduction motor with an output shaft, characterized in that it also includes a sleeve fixed on the output shaft and a push rod located in the sleeve and fixed to the output shaft at one end, a sliding block is sleeved on the push rod and the sliding block is circumferentially fixed to the push rod, a blocking portion is provided at the port of the sleeve, a spring is outerly provided on the push rod, and one end of the spring presses on the sliding block to make it abut against the blocking portion, the sliding block is also provided with a clamping joint extending out of the sleeve for cooperating with a center hole of the yoke, a travel groove is provided on the clamping joint and the push rod can extend into the travel groove, the device also includes a positioning column inserted in the travel groove and the diameter of the positioning column is slightly smaller than the width of the travel groove, when the sliding block slides relative to the push rod, the push rod can extend into the travel groove and push the positioning column to slide.

[0007] The device comprises a reduction motor with an output shaft. A conventional reduction motor has an output shaft, and the output shaft can rotate in a circumferential direction under the drive of the reduction motor.

[0008] The device includes a sleeve fixed on the output shaft and a push rod located in the sleeve and fixed at one end to the output shaft, a slider is sleeved on the push rod and the slider is fixed to the push rod in the circumferential direction. The sleeve is annular, and one end of the sleeve is fixed to the output shaft and is arranged coaxially with the output shaft. The push rod is inserted into the sleeve and fixed at one end to the output shaft, and the push rod is also arranged coaxially with the output shaft. The slider can slide relative to the push rod and can rotate with the push rod when the push rod rotates circumferentially. A blocking portion is provided at the end of the sleeve, and a spring is provided on the outer sleeve of the push rod, and one end of the spring presses on the slider to make it abut against the blocking portion. The blocking portion can form a block with the slider to limit the slider from falling out of the sleeve, one end of the spring presses on the end face of the output shaft, and the other end of the spring presses on the slider to make it abut against the blocking portion. In this way, when the slider is pressed, it can overcome the spring elastic force and move in the direction of the output shaft, and can be pressed against the blocking portion again by the spring when the external force disappears.

[0009] The slider is also provided with a clamping joint extending out of the sleeve for cooperating with the center hole of the yoke. When welding the yoke, we first need to let the clamping joint extend between the two ear seats of the yoke, and then the end of the clamping joint can extend into the center hole of the yoke. The two ear seats are distributed one above and one below. Due to the effect of gravity, the ear seat located above the clamping joint will rest on the outer peripheral surface of the clamping joint, so that the entire yoke can be placed flat on the clamping joint. In this way, it is more convenient to replace the yoke after the yoke is welded. There is no need to manually support the yoke, and it can be directly aligned with the center hole and placed on the clamping joint. A travel groove is provided on the clamping joint, and the position of the travel groove is located below the ear seat after the yoke is placed flat, so that the hole position on the ear seat can face the travel groove. The travel groove is located on the side of the clamping joint and passes through the clamping joint, so the two ear seats on the yoke are respectively located at the upper notch and the lower notch of the travel groove. The device also includes a positioning column inserted in the travel groove, and the diameter of the positioning column is slightly smaller than the width of the travel groove. In this way, when the positioning column is extended into the travel groove, it can be stopped and limited by the groove walls on both sides of the travel groove. Therefore, the yoke is first placed on the clamping joint, and then the positioning column is inserted into the hole on the ear seat of the yoke. The positioning column continues to extend into the travel groove and continues to pass through the ear seat hole on the lower side of the yoke. The positioning column and the two side walls of the travel groove are abutted against the limit, that is, the two ear seats of the yoke are laterally limited, which effectively prevents the yoke from being lateralized due to external forces. The ear seat of the yoke is against the clamping joint to position it up and down. This setting makes the clamping and positioning of the yoke more convenient. The positioning column extends into the hole of the ear seat and the travel groove in an interlaced manner. This setting is more convenient for disassembly or installation. Moreover, the yoke is positioned in the four directions of up, down, left, and right. The positioning accuracy of this positioning is much higher than that of conventional clamping positioning, which is more stable during processing and greatly improves the welding accuracy.

[0010] When the slider slides relative to the push rod, the push rod can extend into the travel groove and push the positioning column to move toward one side of the travel groove. After the yoke is fixed, the shaft on the other side of the center hole of the yoke will be driven by the cylinder to push into the center hole of the yoke. When entering, it will abut against the clamping joint and continue to press the clamping joint to overcome the elastic force of the spring and move toward the sleeve. The push rod will enter the travel groove under the sliding of the slider and form abutment with the positioning column to limit its displacement with the clamping joint. When one end of the shaft completely enters the center hole of the yoke, the reduction motor rotates the welding gun on one side of the reduction motor to weld close to the connection between the shaft and the yoke. The yoke can only slide along the length direction of the travel groove, which is not easy to cause the shaft to be offset when it extends into the center hole of the yoke, and the positioning accuracy is high.

[0011] In the above-mentioned automatic welding device for a steering yoke, a plurality of evenly distributed ribs are provided on the outer peripheral surface of the push rod along its axial direction, a mounting hole is provided at the center position of the slider for the push rod to extend into and communicate with the travel groove, a clamping groove corresponding to the rib is provided on the inner wall of the mounting hole, the push rod is extended into the mounting hole and the rib is clamped in the clamping groove.

[0012] The outer circumference of the ejector rod is provided with a number of evenly distributed ribs along its axial direction. The ribs are distributed on the outer circumference of the ejector rod in a long strip shape and along the length direction of the ejector rod. The inner wall of the mounting hole is provided with a slot corresponding to the ribs. The slot is also in a long strip shape. When the ejector rod is inserted into the mounting hole, the ribs are located in the slots and are limited by the slots, resulting in the circumferential fixation of the slider and the ejector rod. There are several ribs on the outer circumference of the ejector rod, and there are also several slots in the corresponding mounting hole. This arrangement makes the circumferential fixation more stable and further improves the positioning accuracy.

[0013] In the above-mentioned automatic welding device for steering yoke, a raised annular retaining edge is provided on the side of the slider, and the blocking part is a convex edge protruding toward the inner side of the sleeve. Under the action of the spring force, the slider makes the annular retaining edge and the convex edge abut against each other for axial limitation.

[0014] The annular stopper edge and the convex edge are mainly used to axially limit the slider, restricting one end of the slider to prevent it from falling out of the sleeve. In addition, the annular stopper edge is distributed circumferentially along the slider, and the convex edge is distributed circumferentially along the inner side of the sleeve. The circumferential abutment stability of the two is relatively high, which further improves the positioning accuracy.

[0015] In the above-mentioned automatic welding device for steering yoke, arc-shaped chamfered groove 1 and chamfered groove 2 are provided on the groove walls on both sides of the travel groove along the length direction of the clamping joint, and the positioning column can slide so that its outer peripheral surface abuts against the groove wall of chamfered groove 1 or chamfered groove 2.

[0016] The design of chamfer groove one and chamfer groove two makes it possible for the positioning column to fit better with the groove walls on both sides of the length direction of the travel groove when they abut against each other, that is, the arc-shaped groove wall abuts against the arc-shaped outer peripheral surface of the positioning column. In this way, the wear of the outer peripheral surface of the positioning column is alleviated during repeated clamping of the yoke and welding, so that it fits better with the groove width of the travel groove and can be better limited, and the positioning accuracy is further improved.

[0017] In the above-mentioned automatic welding device for steering yoke, the end face of the push rod is an arc-shaped surface with the same arc as the groove wall of the chamfered groove 1.

[0018] The design of the curved surface also serves to better fit the outer circumference of the positioning column when in contact with the positioning column, thereby preventing the outer circumference of the positioning column from being damaged when the slider slides. The positioning column is rotatable, and after its outer circumference is damaged, when the damaged part rotates to the position of the groove width of the stroke groove, it will affect the accuracy of the positioning column being limited by the groove wall where the width of the stroke groove is located, causing the positioning column to swing left and right, affecting the positioning accuracy. Therefore, the design of the curved surface can make it fit better when in contact with the outer circumference of the positioning column, thereby further increasing the positioning accuracy.

[0019] In the above-mentioned automatic welding device for steering yoke, a radially protruding annular convex portion is provided on the positioning column outside the travel groove, and the diameter of the annular convex portion is larger than the width of the travel groove.

[0020] The presence of the annular protrusion enables the positioning column to be clamped on the travel groove to prevent it from passing through the travel groove, making it easy to take and further improving the speed of clamping and positioning.

[0021] In the above-mentioned automatic welding device for steering yoke, the clamping joint comprises a head extending into the central hole of the yoke and a body located between two ear seats of the yoke, and the travel groove laterally penetrates the body.

[0022] The card joint includes a head extending into the center hole of the yoke and a cylindrical body. The card joint consists of two sections. The body is located between the two ear seats, and its diameter is slightly smaller than the distance between the ear seats. The head extends into the center hole of the yoke, so that the front and rear ends of the yoke are fixed, and the positioning accuracy is high.

[0023] In the above-mentioned automatic welding device for steering yoke, a first cutting groove and a second cutting groove are provided at the notches on both sides of the travel groove.

[0024] Since the inner side surface of the ear seat of the yoke is a plane, and the body is cylindrical with its outer side surface being a circumferential surface, the setting of groove one and groove two makes the inner side surface of the ear seat more stable when it rests against groove one and groove two, and its positioning stability is higher. Groove one and groove two are also equivalent to marks on the outer circumferential surface of the body, so that the ear seat can be positioned more quickly, and the clamping positioning speed is further improved.

[0025] In the above-mentioned automatic welding device for steering yoke, a raised guide head is provided on the output shaft, the push rod is threadedly connected to the guide head, a guide groove is opened on one end face of the slider, one end of the spring extends into the guide groove and presses on the bottom of the guide groove, and the other end of the spring is sleeved outside the guide head and presses on the end face of the output shaft.

[0026] In the above-mentioned automatic welding device for steering yoke, the inner side of one end of the sleeve has an internal thread, and the sleeve is connected to the output shaft through threads.

[0027] Compared with the prior art, the advantages of this product are: the clamping joint of this device extends into between the two ear seats of the yoke to form a resistance therewith, the positioning column extends into the hole on the ear seat and passes through the stroke groove to form a resistance limit with the groove wall, so that the four directions of up, down, left and right are all positioned. The positioning accuracy of this positioning is much higher than that of conventional clamping positioning, it is more stable during processing, and the welding accuracy is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the present invention;

[0029] Figure 2 is a schematic diagram of parts of the device of the present invention;

[0030] Figure 3 is a half-section view of the device of the present invention;

[0031] Figure 4 It is a schematic diagram of the parts of the slider of the present invention;

[0032] Figure 5 is a half-section view of a slider of the present invention;

[0033] Figure 6 It is a schematic diagram of parts of the ejector rod of the present invention;

[0034] Figure 7 It is a schematic diagram of parts of the positioning column of the present invention.

[0035] In the figure, 1, reduction motor; 11, output shaft; 111, guide head; 2, sleeve; 21, convex edge; 3, push rod; 31, convex rib; 32, arc surface; 4, slider; 41, clamping joint; 411, travel groove; 412, chamfering groove 1; 413, chamfering groove 2; 414, head; 415, body; 416, cutting groove 1; 417, cutting groove 2; 42, mounting hole; 43, clamping groove; 44, annular retaining edge; 45, guide groove; 5, spring; 6, positioning column; 61, annular convex part. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0037] Embodiment 1

[0038] like Figure 1-Figure 3 The device for automatic welding of a steering yoke shown in the figure includes an operation panel, a reduction motor 1 with an output shaft 11, a device fixedly connected to the output shaft 11, a push cylinder, a sub-clamping head connected to the push cylinder, and a welding gun assembly located on one side of the reduction motor 1. The sub-clamping head is arranged above the push cylinder and can be driven to move by the push cylinder. The sub-clamping head is arranged opposite to the device. After the yoke is clamped and positioned on the device, one end of the shaft is aligned with the center hole of the yoke, and then the push cylinder is allowed to bring the sub-clamping head close to and press against the other end of the shaft. As the push cylinder continues to press, one end of the shaft can be pressed into the center hole of the yoke. Then the output shaft 11 of the reduction motor 1 rotates, and the welding gun on the welding gun assembly is allowed to approach the starting contact position of the yoke and the shaft for welding.

[0039] The device is composed of a sleeve 2, a push rod 3, a slider 4 and a spring 5. A raised guide head 111 is provided on the output shaft 11. The push rod 3 is threadedly connected to the guide head 111. A guide groove 45 is provided on the left end surface of the slider 4. One end of the spring 5 extends into the guide groove 45 and presses on the bottom of the guide groove 45. The other end of the spring 5 is sleeved outside the guide head 111 and presses on the end surface of the output shaft 11. A blocking portion is provided at the end of the sleeve 2. The blocking portion is a radially inwardly protruding convex edge 21. The push rod 3 is inserted into the sleeve 2 and fixed to the output shaft 11 at one end. The push rod 3 is also coaxially arranged with the output shaft 11. The slider 4 can slide relative to the push rod 3 and can rotate with the push rod 3 when the push rod 3 rotates circumferentially. In this way, when the slider 4 is pressed, it can overcome the elastic force of the spring 5 and move in the direction of the output shaft 11. When the external force disappears, it can be pressed against the blocking portion again by the spring 5. A raised annular retaining edge 44 is provided on the outer circumferential surface of the slider 4. Under the action of the elastic force of the spring 5, the slider 4 makes the annular retaining edge 44 abut against the convex edge 21 for axial limitation. The abutment between the annular retaining edge 44 and the convex edge 21 is mainly for axially limiting the slider 4, restricting one end of the slider 4 to prevent it from falling out of the sleeve 2, and the annular retaining edge 44 is distributed circumferentially along the slider 4, and the convex edge 21 is distributed circumferentially along the inner side of the sleeve 2, and the circumferential abutment stability of the two is relatively high.

[0040] like Figure 1-Figure 7 The central position of the slider 4 is provided with a mounting hole 42 for the push rod 3 to extend into and communicate with the travel groove 411. The inner wall of the mounting hole 42 is provided with a clamping groove 43 corresponding to the convex rib 31. The push rod 3 extends into the mounting hole 42 and the convex rib 31 is clamped with the clamping groove 43. The clamping groove 43 is also in a long strip shape. When the push rod 3 extends into the mounting hole 42, the convex rib 31 is located in the clamping groove 43 and is limited by the clamping groove 43, resulting in the circumferential fixation of the slider 4 and the push rod 3. There are several convex ribs 31 on the outer circumference of the push rod 3, and there are also several corresponding clamping grooves 43 in the mounting hole 42. This arrangement makes the circumferential fixation more stable.

[0041] The slider 4 is also provided with a clamping joint 41 extending out of the sleeve 2 for cooperating with the center hole of the yoke. The clamping joint 41 includes a head 414 extending into the center hole of the yoke and a columnar body 415. The body 415 is laterally provided with a travel groove 411 passing through it. The travel groove 411 is in a long strip shape. The body 415 is located between the two ear seats, and its diameter is slightly smaller than the distance between the ear seats. The head 414 extends into the center hole of the yoke, so that the front and rear ends of the yoke are fixed, and the positioning accuracy is high. The notches on both sides of the travel groove 411 are also provided with a first cutting groove 416 and a second cutting groove 417. Since the inner side surface of the ear seat of the yoke is a plane, and the body 415 is cylindrical and its outer side surface is a circumferential surface, the setting of groove 1 416 and groove 2 417 makes the inner side surface of the ear seat more stable when it rests against groove 1 416 and groove 2 417, and its positioning stability is relatively high. Groove 1 416 and groove 2 417 are also equivalent to marks on the outer circumferential surface of the body 415, so that the ear seat can be positioned more quickly, and the clamping positioning speed is further improved.

[0042] When welding the yoke, we first need to let the clamping joint 41 extend between the two ear seats of the yoke, and then the end of the clamping joint 41 can extend into the center hole of the yoke. The two ear seats are distributed one above and one below. Due to the effect of gravity, the ear seat located above the clamping joint 41 will rest on the outer peripheral surface of the clamping joint 41, so that the entire yoke can be placed flat on the clamping joint 41. In this way, it is more convenient to replace the yoke after the yoke is welded. There is no need to manually support the yoke. Just align it with the center hole and place it on the clamping joint 41. The clamping joint 41 is provided with a travel groove 411 on the side. The position of the travel groove 411 is located below the ear seat after the yoke is placed flat, so that the hole position on the ear seat can face the travel groove 411. Since the travel groove 411 passes through the clamping joint 41 laterally, the two ear seats on the yoke are respectively located at the upper notch and the lower notch of the travel groove 411.

[0043] The device also includes a positioning column 6 that is inserted into the travel groove 411, and the diameter of the positioning column 6 is slightly smaller than the width of the travel groove 411, so that when the positioning column 6 extends into the travel groove 411, it can be stopped and limited by the groove walls on both sides of the travel groove 411. The positioning column 6 is provided with a radially protruding annular convex portion 61 outside the travel groove 411, and the diameter of the annular convex portion 61 is larger than the width of the travel groove 411. The presence of the annular convex portion 61 allows the positioning column 6 to be clamped on the travel groove 411, preventing it from passing through the travel groove 411, making it easy to take, and further improving the speed of clamping and positioning. Therefore, the yoke is first placed on the clamping joint 41, and then the positioning column 6 is used to insert the hole on the ear seat of the yoke. The positioning column 6 continues to extend into the travel groove 411 and continues to pass through the ear seat hole on the lower side of the yoke. The positioning column 6 and the two side groove walls of the travel groove 411 are abutted against the limit, that is, the two ear seats of the yoke are laterally limited, which effectively prevents the yoke from being laterally deviated due to external forces. The ear seat of the yoke is against the clamping joint 41 to position it up and down. This arrangement makes the clamping and positioning of the yoke more convenient. The positioning column 6 extends into the hole of the ear seat and the travel groove 411 in an interlaced manner. This arrangement makes disassembly or installation more convenient. Moreover, the yoke is positioned in the four directions of up, down, left, and right. The accuracy of such positioning is much higher than that of conventional clamping positioning, which is more stable during processing and the welding accuracy is greatly improved. When the slider 4 slides relative to the push rod 3, the push rod 3 can extend into the travel groove 411 and push the positioning column 6 to move toward one side of the travel groove 411. After the yoke is fixed, the shaft on the other side of the center hole of the yoke will be driven by the cylinder to push into the center hole of the yoke. When entering, it will abut against the clamping joint 41 and continue to press the clamping joint 41 to overcome the elastic force of the spring 5 and move toward the sleeve 2. The push rod 3 will enter the travel groove 411 under the sliding of the slider 4 and abut against the positioning column 6 to limit its displacement along with the clamping joint 41. When one end of the shaft completely enters the center hole of the yoke, the reduction motor 1 rotates the welding gun located on one side of the reduction motor 1 to approach the connection between the shaft and the yoke for welding. The yoke can only slide along the length direction of the travel groove 411, and it is not easy to be offset, which will cause the shaft to be offset when it is extended into the center hole of the yoke. The positioning accuracy is relatively high.

[0044] The travel groove 411 is provided with arc-shaped chamfered groove 1 412 and chamfered groove 2 413 on both sides of the groove wall along the length direction of the clamping joint 41, and the positioning column 6 can slide so that its outer peripheral surface abuts against the groove wall of chamfered groove 1 412 or chamfered groove 2 413. The design of chamfered groove 1 412 and chamfered groove 2 413 makes it possible for the positioning column 6 to fit better with the groove walls on both sides of the length direction of the travel groove 411 when abutting, that is, the arc-shaped groove wall abuts against the arc-shaped outer peripheral surface of the positioning column 6, so that the wear of the outer peripheral surface of the positioning column 6 is alleviated during the process of repeatedly clamping the yoke and welding, so that it fits better with the groove width of the travel groove 411 and can be better limited, and the positioning accuracy is further improved. The end face of the push rod 3 is an arc-shaped surface 32 with the same curvature as the groove wall of the chamfered groove 1 412. The design of the arc surface 32 also serves to better fit the outer circumference of the positioning column 6 when in contact with the positioning column 6, thereby preventing the outer circumference of the positioning column 6 from being damaged when the slider 4 slides. The positioning column 6 is rotatable, and after its outer circumference is damaged, when the damaged part rotates to the position of the groove width of the stroke groove 411, it will affect the accuracy of the positioning column 6 being limited by the groove wall where the width of the stroke groove 411 is located, causing the positioning column 6 to shake left and right, affecting the positioning accuracy. Therefore, the design of the arc surface 32 can make it fit better when in contact with the outer circumference of the positioning column 6, thereby further increasing the positioning accuracy.

[0045] Embodiment 2

[0046] The structure and principle of this embodiment are basically the same as those of the first embodiment, except that: the radial cross section of the push rod 3 in this embodiment is triangular, and no ribs 31 are provided on its outer circumference, and the shape of the mounting hole 42 on the slider 4 is triangular and adapted to the push rod 3. This arrangement can also play a role of circumferential limit when the push rod 3 extends into the mounting hole 42. The cooperation with the ribs 31 and the slots 43 to limit the circumferential rotation of the slider 4 has the same technical effect.

[0047] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A device for automatic welding of a steering yoke, the device comprising a reduction motor (1) having an output shaft (11), characterized in that: The invention also comprises a sleeve (2) fixed on the output shaft (11) and a push rod (3) located in the sleeve (2) and fixedly connected to the output shaft (11) at one end, a slider (4) being sleeved on the push rod (3) and the slider (4) and the push rod (3) being circumferentially fixed, a blocking portion being provided at the end of the sleeve (2), a spring (5) being sleeved on the push rod (3), and one end of the spring (5) pressing on the slider (4) so ​​that it abuts against the blocking portion, a clamping joint (41) extending out of the sleeve (2) and for cooperating with a center hole of a yoke, a strip-shaped travel groove (411) being provided on the clamping joint (41) and the push rod ( 3) can be inserted into the travel groove (411), the device also includes a positioning column (6) inserted into the travel groove (411), and the diameter of the positioning column (6) is slightly smaller than the width of the travel groove (411), when the slider (4) slides relative to the push rod (3), the push rod (3) can be inserted into the travel groove (411) and push the positioning column (6) to slide, the clamping joint (41) includes a head (414) for inserting into the central hole of the yoke and a body (415) located between two ear seats of the yoke, the travel groove (411) laterally penetrates the body (415), and the two ear seats on the yoke are respectively located at the upper notch and the lower notch of the travel groove (411).

2. The automatic welding device for steering yoke according to claim 1, characterized in that: A plurality of evenly distributed convex ribs (31) are provided on the outer peripheral surface of the push rod (3) along its axial direction; a mounting hole (42) is provided at the center of the slider (4) for the push rod (3) to extend into and communicate with the travel groove (411); a clamping groove (43) corresponding to the convex rib (31) is provided on the inner wall of the mounting hole (42); the push rod (3) extends into the mounting hole (42) and the convex rib (31) is clamped with the clamping groove (43).

3. The automatic welding device for steering yoke according to claim 2, characterized in that: A raised annular retaining edge (44) is provided on the side of the slider (4), and the retaining portion is a raised edge (21) that is raised toward the inner side of the sleeve (2). Under the action of the elastic force of the spring (5), the slider (4) causes the annular retaining edge (44) to abut against the raised edge (21) for axial limiting.

4. The automatic welding device for steering yoke according to claim 3, characterized in that: The clamping joint (41) is provided with arc-shaped chamfered groove 1 (412) and chamfered groove 2 (413) on both sides of the groove wall in the length direction of the travel groove (411), and the positioning column (6) can slide so that its outer peripheral surface abuts against the groove wall of chamfered groove 1 (412) or chamfered groove 2 (413).

5. The automatic welding device for steering yoke according to claim 4, characterized in that: The end surface of the push rod (3) is an arc-shaped surface (32) having the same arc as the groove wall of the chamfered groove 1 (412).

6. The automatic welding device for steering yoke according to claim 5, characterized in that: A radially protruding annular convex portion (61) is provided on the positioning column (6) outside the travel groove (411), and the diameter of the annular convex portion (61) is greater than the width of the travel groove (411).

7. The automatic welding device for steering yoke according to claim 6, characterized in that: A first cutting groove (416) and a second cutting groove (417) are also provided at the notches on both sides of the travel groove (411).

8. The automatic welding device for steering yoke according to claim 4, 5 or 6, characterized in that: The output shaft (11) is provided with a raised guide head (111), the push rod (3) is threadedly connected to the guide head (111), a guide groove (45) is provided on one end surface of the slider (4), one end of the spring (5) extends into the guide groove (45) and presses against the bottom of the guide groove (45), and the other end of the spring (5) is sleeved outside the guide head (111) and presses against the end surface of the output shaft (11).

9. The automatic welding device for steering yoke according to claim 7, characterized in that: An inner side of a port of the sleeve (2) is provided with an internal thread, and the sleeve (2) is connected to the output shaft (11) via the thread.

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