CN212496283U

CN212496283U - Welding device for steering gear yoke and spline shaft tube

Info

Publication number: CN212496283U
Application number: CN202021299795.8U
Authority: CN
Inventors: 郑勇
Original assignee: Wuhan Jielong Electric Power Steering Co Ltd
Current assignee: Wuhan Jielong Electric Power Steering Co Ltd
Priority date: 2020-07-06
Filing date: 2020-07-06
Publication date: 2021-02-09
Anticipated expiration: 2030-07-06

Abstract

The utility model relates to a welding set of steering gear yoke and spline central siphon belongs to automobile parts welding machine technical field. The welding device comprises a rack, a lower positioning head, an upper positioning head, a detection probe and a welding gun, wherein the lower positioning head is installed on the rack, the upper positioning head is arranged above the lower positioning head, the detection probe is installed on one side of the upper positioning head, and the welding gun is installed on the other side of the upper positioning head. The welding device respectively positions the steering gear yoke and the spline shaft tube through the upper positioning head and the lower positioning head and enables welding lines to be aligned, spot welding is not needed for positioning the steering gear yoke and the spline shaft tube, the welding line state is detected through the detection probe, the welding gun is controlled through the program controller to weld the welding lines, only one person is needed to assemble and disassemble the steering gear yoke and the spline shaft tube in the operation process, the welding process is simplified, the working efficiency can be effectively improved, and the labor cost can be effectively reduced; the problems of various working procedures, low working efficiency and high labor cost of the existing welding process are solved.

Description

Welding device for steering gear yoke and spline shaft tube

Technical Field

The utility model relates to a welding set of steering gear yoke and spline central siphon belongs to automobile parts welding machine technical field.

Background

The steering device yoke comprises a yoke body, connecting arms and connecting pipes, wherein the connecting arms are symmetrically arranged on two sides of the bottom of the yoke body, and mounting holes are formed in the bottom ends of the connecting arms; the center of the top of the joint fork body is provided with a connecting pipe; the bottom center of the yoke body is provided with a through hole which is communicated with the connecting pipe. The top end of the spline shaft tube is provided with a cross spline groove.

The steering gear yoke and the spline shaft tube are connected by welding after being processed respectively due to the processing technology requirement, at present, the welding of the steering gear yoke and the spline shaft tube firstly positions the connecting pipe of the steering gear yoke and the bottom of the spline shaft tube by spot welding and enables the connecting pipe and the bottom of the spline shaft tube to be relatively fixed, and after the spot welding is finished, a carbon dioxide shielded welding gun is used for full welding of the steering gear yoke and the spline shaft tube. The process not only needs a plurality of working procedures, but also needs a plurality of persons to cooperate and operate on the stations of different working procedures, and not only has low working efficiency, but also has high labor cost, so that the improvement is needed.

Disclosure of Invention

The utility model aims at: aiming at the defects of the prior art, the welding device for the steering gear yoke and the spline shaft tube is provided, which can simplify the welding process, effectively improve the working efficiency and reduce the labor cost.

The technical scheme of the utility model is that:

the utility model provides a welding set of steering gear yoke and spline central siphon, it comprises frame, lower locating head, upper locating head, test probe and welder, its characterized in that: the working face of the rack is provided with a lower positioning head through a lower rotating motor, the rack above the lower positioning head is provided with an upper positioning head, one side of the rack between the upper positioning head and the lower positioning head is provided with a detection probe through a left support frame, the other side of the rack between the upper positioning head and the lower positioning head is provided with a welding gun through a right support frame, and the lower rotating motor, the welding gun and the detection probe are respectively connected with a program controller.

The lower positioning head consists of a lower rotating disc, a lower positioning die and positioning cylinders, the center of the top of the lower rotating disc is embedded with the lower positioning die through a positioning bolt, and the positioning cylinders are symmetrically arranged on the lower rotating discs on two sides of the lower positioning die; the lower rotary table is fixedly connected with the end head of an output shaft of the lower rotary motor.

The lower positioning die is cylindrical, limiting recesses are symmetrically arranged on two sides of the top end surface of the lower positioning die, and positioning through holes are formed in the limiting recesses; the lower rotary table is provided with a communicating hole corresponding to the positioning through hole, and a piston rod of the positioning cylinder penetrates through the communicating hole to be connected with the positioning through hole in an intermittent contact manner.

And a positioning block is arranged on the lower positioning die between the limiting recesses.

And a positioning rod is arranged on the lower positioning die between the limiting recesses.

The upper positioning head consists of an upper assembling plate, an upper positioning die and a displacement gear, the upper assembling plate is provided with the upper positioning die through an upper rotating motor, and the upper assembling plate at one side of the upper positioning die is provided with the displacement gear through the displacement motor; the upper assembling plate is connected with the rack in a sliding manner through symmetrically arranged sliding rails.

And a displacement rack is arranged on the rack between the sliding rails and is meshed with a displacement gear penetrating through the upper assembling plate.

The upper positioning die is in a prism shape.

The left support frame is composed of a left support plate, a cylinder support plate, an advancing cylinder and a mounting plate, the cylinder support plate is mounted on the left support plate through a left rotating disc, the advancing cylinder is arranged on the cylinder support plate, and the mounting plate is fixedly mounted at the end of a piston rod of the advancing cylinder; the mounting plate is fixedly connected with the detection probe.

The air cylinder support plate on one side of the advancing air cylinder is movably inserted with a positioning guide rod, the end of the positioning guide rod on one side of the air cylinder support plate is fixedly connected with the mounting plate, the positioning guide rod on the other side of the air cylinder support plate is sleeved with a displacement distance limiting block, and the displacement distance limiting block is fixedly connected with the positioning guide rod through a limiting bolt.

The right support frame consists of a vertical positioning support mechanism, a right turntable, an oblique positioning support mechanism and a fixed plate, wherein the vertical positioning support mechanism is provided with the oblique positioning support mechanism through the right turntable, and the oblique positioning support mechanism is provided with the fixed plate; the vertical positioning support mechanism is fixedly connected with the rack; the fixed plate is fixedly connected with the welding gun through the symmetrically arranged right support plates.

The vertical positioning support mechanism and the oblique positioning mechanism respectively comprise a screw rod mounting plate, a positioning screw rod and a right assembling plate, the screw rod mounting plate is U-shaped, the positioning screw rod is movably mounted on the screw rod mounting plate through a bearing, and the right assembling plate is mounted on the positioning screw rod between the screw rod mounting plates in a threaded manner; the screw mounting plate of the vertical positioning support mechanism is fixedly connected with the rack; the right turntable is respectively connected with a right assembling plate of the vertical positioning support mechanism and a screw mounting plate of the oblique positioning mechanism; and the right assembling plate of the oblique positioning mechanism is fixedly connected with the fixed plate.

The screw mounting plates on the two sides of the positioning screw are symmetrically provided with guide rods, and the guide rods are connected with the right assembling plate in a sliding and inserting manner.

One end of the positioning screw rod extends to the outer side of the screw rod mounting plate, and a hand wheel is arranged at the end head of the positioning screw rod extending to the outer side of the screw rod mounting plate.

The beneficial effects of the utility model reside in that:

the welding device for the steering gear yoke and the spline shaft tube respectively positions the steering gear yoke and the spline shaft tube through the upper positioning head and the lower positioning head and enables welding lines to be aligned, spot welding is not needed for positioning the steering gear yoke and the spline shaft tube, the welding line state is detected through the detection probe, a welding gun is controlled through a program controller to weld the welding lines, only one person is needed to assemble and disassemble the steering gear yoke and the spline shaft tube in the operation process, the welding process is simplified, the working efficiency can be effectively improved, and the labor cost can be effectively reduced; the problems of various working procedures, low working efficiency and high labor cost of the existing welding process are solved.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a schematic top view of FIG. 1;

FIG. 3 is a schematic cross-sectional view of the lower positioning head of the present invention;

fig. 4 is a schematic structural view of the lower positioning mold of the present invention;

fig. 5 is a schematic structural view of the improved lower positioning die of the present invention;

FIG. 6 is a schematic structural view of the right support frame of the present invention;

fig. 7 is a schematic top view of fig. 6.

In the figure: 1. the device comprises a frame, 2, a power switch, 3, a detection probe, 4, a welding gun, 5, a lower rotating motor, 6, a lower rotating disc, 7, a lower positioning die, 8, a positioning cylinder, 9, a positioning bolt, 10, a limiting concave, 11, a positioning through hole, 12, a communication hole, 13, a positioning block, 14, a positioning rod, 15, an upper assembling plate, 16, an upper positioning die, 17, a displacement gear, 18, an upper rotating motor, 19, a displacement motor, 20, a sliding rail, 21, a displacement rack, 22, a left supporting plate, 23, a cylinder supporting plate, 24, an advancing cylinder, 25, a mounting plate, 26, a left rotating disc, 27, a positioning guide rod, 28, a displacement distance limiting block, 29, a limiting bolt, 30, a right rotating disc, 31, a fixing plate, 32, a screw mounting plate, 33, a positioning screw, 34, a right assembling plate, 35, a guide rod, 36, a hand wheel, 37 and a right supporting.

Detailed Description

The welding device of the steering gear yoke and the spline shaft tube comprises a rack 1, a lower positioning head, an upper positioning head, a detection probe 3 and a welding gun 4, wherein a lower rotating motor 5 is arranged on the rack 1, the lower positioning head is arranged at the end head of an output shaft of the lower rotating motor 5, the lower positioning head consists of a lower rotating disc 6, a lower positioning die 7 and a positioning cylinder 8, the lower positioning die 7 is embedded in the center of the top of the lower rotating disc 6 through a positioning bolt 9, the lower positioning die 7 is cylindrical, limiting recesses 10 are symmetrically arranged on two sides of the top end surface of the lower positioning die 7, the appearance of the limiting recesses 10 is consistent with that of a steering gear yoke connecting arm, and when the connecting arm of the steering gear yoke is inserted into the limiting recesses 10, the lower positioning die 7 limits the position of the steering gear yoke on the lower positioning die 7 through the limiting recesses 10; a positioning through hole 11 is formed in the limiting concave 10, the positioning through hole 11 corresponds to a mounting hole of the steering gear yoke, and the mounting hole is communicated with the positioning through hole 11 after a connecting arm of the steering gear yoke is inserted into the limiting concave 10; the lower rotary table 6 at two sides of the lower positioning die 7 is symmetrically provided with positioning cylinders 8, the lower rotary table 6 is provided with communicating holes 12 corresponding to the positioning through holes 11, and piston rods of the positioning cylinders 8 penetrate through the communicating holes 12 to be in intermittent contact connection with the positioning through holes 11; a positioning block 13 is arranged on the lower positioning die 7 between the limiting recesses 10, the positioning block 13 is used for positioning a yoke body of the steering device yoke and is matched with the limiting recesses 10 to position the steering device yoke; the lower rotary table 6 is fixedly connected with the end of the output shaft of the lower rotary motor 5.

As the improved generation of lower positioning die 7, also can set up locating lever 14 on lower positioning die 7 between spacing concave 13, when the steering gear yoke is installed on lower positioning die 7, locating lever 14 passes the yoke body and the connecting pipe of steering gear yoke and extends to the connecting pipe top, the locating lever 14 that extends to the connecting pipe top can insert the bottom of spline central siphon and spacing to spline central siphon bottom, make the butt joint of spline central siphon bottom and connecting pipe more accurate, the welding seam aligns more accurately promptly.

An upper positioning head is arranged on the rack 1 above the lower positioning head, the upper positioning head is composed of an upper assembling plate 15, an upper positioning die 16 and a displacement gear 17, the upper assembling plate 15 is provided with the upper positioning die 16 through an upper rotating motor 18, the upper positioning die 16 is prismatic, the shape of the upper positioning die 16 is consistent with the cross spline groove of the spline shaft tube, the upper positioning die 16 is in interference connection with the cross spline groove of the spline shaft tube, after the upper positioning die 16 is inserted into the cross spline groove of the spline shaft tube, the upper positioning die 16 is matched with the cross spline groove to limit the spline shaft tube, so that the position of the spline shaft tube corresponds to a steering gear yoke arranged on the lower positioning die 7, and when the lower part of the spline shaft tube contacts with the connecting tube of the steering gear yoke, the bottom of the spline shaft tube can be aligned with the top of the connecting tube, namely, a welding seam is aligned; an upper assembling plate 15 at one side of an upper positioning die 16 is provided with a displacement gear 17 through a displacement motor 19, and the upper assembling plate 15 is in sliding connection with the rack 1 through symmetrically arranged slide rails 20; a displacement rack 21 is arranged on the rack 1 between the slide rails 20, the displacement rack 21 is meshed with a displacement gear 17 penetrating through the upper assembling plate 15, when the displacement motor 19 rotates, the displacement gear 17 is driven to rotate, the displacement gear 17 drives the displacement motor 19 to displace through the displacement rack 21, the upper assembling plate 15 is driven to displace along the slide rails 20, and then the upper positioning die 16 is driven to displace through the upper rotating motor 18; the displacement motor 19 drives the upper positioning die 16 to move downwards when rotating anticlockwise, and drives the upper positioning die 16 to move upwards when rotating clockwise.

A detection probe 3 is mounted on one side of the rack 1 between the upper positioning head and the lower positioning head through a left support frame, the detection probe 3 is a visual detection probe, and the detection probe 3 is used for detecting the alignment state and the welding condition of the welding seam; the left support frame is composed of a left support plate 22, an air cylinder support plate 23, an advancing air cylinder 24 and a mounting plate 25, a left turntable 26 is mounted on the left support plate 22 through a pin shaft, the air cylinder support plate 23 is fixedly mounted on the left turntable 26, the advancing air cylinder 24 is arranged on the air cylinder support plate 23, the mounting plate 25 is fixedly mounted at the end of a piston rod of the advancing air cylinder 24, and the mounting plate 25 is fixedly connected with the detection probe 3; a positioning guide rod 27 is movably inserted on the cylinder support plate 23 at one side of the advancing cylinder 24, the end of the positioning guide rod 27 at one side of the cylinder support plate 23 is fixedly connected with the mounting plate 25, a displacement distance limiting block 28 is sleeved on the positioning guide rod 27 at the other side of the cylinder support plate 23, and the displacement distance limiting block 28 is fixedly connected with the positioning guide rod 27 through a limiting bolt 29; the left rotary disc 26 is used for adjusting the inclination angle of the cylinder support plate 23, and further adjusting the inclination angle of the detection probe 3 through the advancing cylinder 24 and the positioning guide rod 27, so that the detection probe 3 can be aligned with a welding seam; the advancing cylinder 24 is used for driving the detection probe 3 to displace so as to enable the detection probe 3 to be close to the welding line, and therefore the detection precision is improved; the positioning guide rod 27 is used for limiting the movement direction of the detection probe 3, preventing the detection probe 3 from deviating in the movement process, and meanwhile, the displacement distance of the detection probe 3 is limited by matching with the displacement distance limiting block 28, so that the detection probe is prevented from colliding with a workpiece and the detection probe 3 cannot be damaged.

The other side of the rack 1 between the upper positioning head and the lower positioning head is provided with a welding gun 4 through a right support frame, and the welding gun 4 is a carbon dioxide arc welding gun; the right support frame consists of a vertical positioning support mechanism, a right turntable 30, an oblique positioning support mechanism and a fixed plate 31, wherein the vertical positioning support mechanism is provided with the oblique positioning support mechanism through the right turntable 30, and the oblique positioning support mechanism is provided with the fixed plate 31; the vertical positioning support mechanism and the oblique positioning mechanism are respectively composed of a screw mounting plate 32, a positioning screw 33 and a right assembly plate 34, the screw mounting plate 32 is U-shaped, the positioning screw 33 is movably mounted on the screw mounting plate 32 through a bearing, and the right assembly plate 34 is mounted on the positioning screw 33 between the screw mounting plates 32 in a threaded manner; guide rods 35 are symmetrically arranged on the screw mounting plates 32 on two sides of the positioning screw 33, and the guide rods 35 are connected with the right assembly plate 34 in a sliding insertion manner; one end of the positioning screw 33 extends to the outer side of the screw mounting plate 32, and a hand wheel 36 is arranged at the end of the positioning screw 33 extending to the outer side of the screw mounting plate 32; the screw mounting plate 32 of the vertical positioning support mechanism is fixedly connected with the frame 1; the right turntable 32 is connected with a right assembling plate 34 of the vertical positioning and supporting mechanism through a pin shaft, and the right turntable 32 is fixedly connected with a screw mounting plate 32 of the oblique positioning mechanism; the right assembling plate 34 of the oblique positioning mechanism is fixedly connected with the fixed plate 31; the fixed plate 31 is fixedly connected with the welding gun 4 through the symmetrically arranged right support plates 37; through the cooperation of the vertical positioning support mechanism, the right rotary disc 30 and the oblique positioning support mechanism, the height, the inclination angle and the interval with the welding seam of the welding gun can be adjusted, so that the welding wire of the welding gun 4 can be ensured to be accurately contacted with the welding seam.

The welding gun 4 and the detection probe 3 are respectively connected with a program controller, a power switch 2 is arranged on the rack 2 at one side of the lower positioning head, and the power switch 2 is respectively and electrically connected with the detection probe 3, the welding gun 4, the lower rotating motor 5, the positioning cylinder 8, the upper rotating motor 18, the displacement motor 19 and the advancing cylinder 24 through the program controller (not shown, the model is Siemens S7-200 PLC); the detection probe 3 can upload detection signals to the program controller, and the detection probe 3, the welding gun 4, the lower rotating motor 5, the positioning cylinder 8, the upper rotating motor 18, the displacement motor 19 and the advancing cylinder 24 are respectively controlled by the program controller.

When the welding device of the steering gear yoke and the spline shaft tube works, the steering gear yoke is arranged on the lower positioning die 7, the connecting arm of the steering gear yoke is inserted into the limiting concave 10 of the lower positioning die 7, and the spline shaft tube is inserted on the upper positioning die 16; after the insertion of the steering gear yoke and the spline shaft tube is finished, the power switch 2 is pressed down to start the program controller, and after the program controller is started, the positioning cylinder 8 is controlled to act, so that a piston rod of the positioning cylinder 8 passes through a communicating hole 12 on the lower rotary table 6 and a mounting hole of the steering gear yoke to enter a positioning through hole 11 on the lower positioning die 7, and the steering gear yoke is fixed on the lower positioning die 7; after the steering gear yoke is fixed, the program controller controls the displacement motor 19 to rotate anticlockwise, the displacement motor 19 is driven to drive the spline shaft tube to move downwards through the upper positioning die 16 in the anticlockwise rotating process, and the spline shaft tube is gradually contacted with and aligned with the connecting tube of the steering gear yoke in the downwards moving process; in the descending process of the spline shaft tube, the program controller controls the advancing cylinder 24 to act to drive the detection probe 3 to move towards the port of the connecting pipe of the steering knuckle fork, and the detection probe stops when moving to the position above the port of the connecting pipe of the steering knuckle fork under the action of the displacement distance limiting block 28 on the positioning guide rod 27; when the spline shaft tube moves downwards to be in contact with a connecting tube of a steering gear yoke, namely when a welding seam is in butt joint, a detection probe uploads a signal to a program controller, the program controller controls a displacement motor 19 to stop rotating, and simultaneously the program controller respectively controls a lower rotating motor 5 and an upper rotating motor 18 to synchronously rotate clockwise, and in the synchronous clockwise rotation process of the lower rotating motor 5 and the upper rotating motor 18, the steering gear yoke and the spline shaft tube are respectively driven to synchronously rotate clockwise, so that the steering gear yoke keeps static relative to the spline shaft tube, in the rotation process of the steering gear yoke and the spline shaft tube, the detection probe 3 detects the welding seam, when the welding seam is not aligned, the detection probe 3 transmits the signal to the program controller, and the program controller gives an alarm to remind a worker of manually correcting the welding seam; after the welding seams are aligned, the detection probe 3 uploads welding seam alignment signals to the program controller, the program controller controls the welding gun 4 to work, welding wires of the welding gun 4 extend out and contact with the welding seams to weld the welding seams, and in the welding process, the program controller controls the lower rotating motor 5 and the upper rotating motor 18 to synchronously rotate, so that the welding seams are gradually welded; after the detection probe 3 detects that the welding of the welding seam is finished, a signal is uploaded to a program controller, the program controller controls the lower rotating motor 5 and the upper rotating motor 18 to synchronously stop rotating, and then controls the displacement motor 19 to rotate clockwise to drive the upper positioning die 16 to reset upwards, and in the process of resetting upwards and upwards of the upper positioning die 16, the program controller controls the advancing cylinder 24 to reset to drive the detection probe 3 to reset; after the upper positioning die 16 is reset, the program controller controls the displacement motor to stop and controls the piston rod of the positioning cylinder 8 to reset, and after the piston rod of the positioning cylinder 8 is reset, the lower positioning die 7 can take down the welded workpiece.

The welding device for the steering gear yoke and the spline shaft tube respectively positions the steering gear yoke and the spline shaft tube through the upper positioning head and the lower positioning head and enables welding lines to be aligned, spot welding is not needed for positioning the steering gear yoke and the spline shaft tube, the detection probe 3 is used for detecting the state of the welding lines and the welding gun 4 is controlled by the program controller to weld the welding lines, only one person is needed to assemble and disassemble the steering gear yoke and the spline shaft tube in the operation process, the welding process is simplified, the working efficiency can be effectively improved, and the labor cost can be effectively reduced; the problems of various working procedures, low working efficiency and high labor cost of the existing welding process are solved.

Claims

1. The utility model provides a welding set of steering gear yoke and spline central siphon, it comprises frame (1), lower locating head, upper locating head, test probe (3) and welder (4), its characterized in that: the working face of frame (1) is gone up and is installed down the location head through down rotating electrical machines (5), is equipped with down the location head on frame (1) of location overhead side, goes up location head and installs test probe (3) through left branch strut with frame (1) one side between the location head down, goes up location head and installs welder (4) through right branch strut with frame (1) opposite side between the location head down, and lower rotating electrical machines (5), welder (4), test probe (3) are connected with the program controller respectively.

2. The welding apparatus of a steering yoke to a splined shaft tube according to claim 1, wherein: the lower positioning head consists of a lower rotating disc (6), a lower positioning die (7) and positioning cylinders (8), the lower positioning die (7) is embedded in the center of the top of the lower rotating disc (6) through a positioning bolt (9), and the positioning cylinders (8) are symmetrically arranged on the lower rotating discs (6) on the two sides of the lower positioning die (7); the lower rotary table (6) is fixedly connected with the end of the output shaft of the lower rotary motor (5).

3. The welding apparatus of a steering knuckle and a splined shaft tube according to claim 2, wherein: the lower positioning die (7) is cylindrical, limiting recesses (10) are symmetrically arranged on two sides of the top end face of the lower positioning die (7), and positioning through holes (11) are formed in the limiting recesses (10); the lower rotary table (6) is provided with a communicating hole (12) corresponding to the positioning through hole (11), and a piston rod of the positioning cylinder (8) penetrates through the communicating hole (12) to be in intermittent contact connection with the positioning through hole (11).

4. The welding apparatus of a steering knuckle and a splined shaft tube according to claim 3, wherein: and a positioning block (13) is arranged on the lower positioning die (7) between the limiting recesses (10).

5. The welding apparatus of a steering knuckle and a splined shaft tube according to claim 3, wherein: and a positioning rod (14) is arranged on the lower positioning die (7) between the limiting recesses (10).

6. The welding apparatus of a steering yoke to a splined shaft tube according to claim 1, wherein: the upper positioning head is composed of an upper assembling plate (15), an upper positioning die (16) and a displacement gear (17), the upper assembling plate (15) is provided with the upper positioning die (16) through an upper rotating motor (18), and the upper assembling plate (15) at one side of the upper positioning die (16) is provided with the displacement gear (17) through a displacement motor (19); the upper assembling plate (15) is connected with the rack (1) in a sliding way through symmetrically arranged sliding rails (20); a displacement rack (21) is arranged on the frame (1) between the slide rails (20), and the displacement rack (21) is meshed with a displacement gear (17) which penetrates through the upper assembly plate (15).

7. The welding apparatus of a steering yoke to a splined shaft tube according to claim 1, wherein: the left support frame is composed of a left support plate (22), an air cylinder support plate (23), an advancing air cylinder (24) and a mounting plate (25), the air cylinder support plate (23) is mounted on the left support plate (22) through a left turntable (26), the advancing air cylinder (24) is arranged on the air cylinder support plate (23), and the mounting plate (25) is fixedly mounted at the end of a piston rod of the advancing air cylinder (24); the mounting plate (25) is fixedly connected with the detection probe (3).

8. The welding apparatus of a steering knuckle and a splined shaft tube according to claim 7, wherein: the air cylinder structure is characterized in that a positioning guide rod (27) is movably inserted into an air cylinder supporting plate (23) on one side of the advancing air cylinder (24), the end of the positioning guide rod (27) on one side of the air cylinder supporting plate (23) is fixedly connected with the mounting plate (25), a displacement distance limiting block (28) is sleeved on the positioning guide rod (27) on the other side of the air cylinder supporting plate (23), and the displacement distance limiting block (28) is fixedly connected with the positioning guide rod (27) through a limiting bolt (29).

9. The welding apparatus of a steering yoke to a splined shaft tube according to claim 1, wherein: the right support frame consists of a vertical positioning support mechanism, a right turntable (30), an oblique positioning support mechanism and a fixed plate (31), the vertical positioning support mechanism is provided with the oblique positioning support mechanism through the right turntable (30), and the oblique positioning support mechanism is provided with the fixed plate (31); the vertical positioning support mechanism is fixedly connected with the rack (1); the fixed plate (31) is fixedly connected with the welding gun (4) through a right support plate (37) which is symmetrically arranged.

10. The welding apparatus of a steering yoke to a splined shaft tube according to claim 9, wherein: the vertical positioning support mechanism and the oblique positioning mechanism are respectively composed of a screw rod mounting plate (32), a positioning screw rod (33) and a right assembling plate (34), the screw rod mounting plate (32) is U-shaped, the positioning screw rod (33) is movably mounted on the screw rod mounting plate (32) through a bearing, and the right assembling plate (34) is mounted on the positioning screw rod (33) between the screw rod mounting plates (32) in a threaded manner; guide rods (35) are symmetrically arranged on the screw mounting plates (32) on two sides of the positioning screw (33), and the guide rods (35) are connected with the right assembly plate (34) in a sliding and inserting manner; one end of the positioning screw rod (33) extends to the outer side of the screw rod mounting plate (32), and a hand wheel (36) is arranged at the end of the positioning screw rod (33) extending to the outer side of the screw rod mounting plate (32); the screw mounting plate (32) of the vertical positioning support mechanism is fixedly connected with the rack (1); the right turntable (30) is respectively connected with a right assembling plate (34) of the vertical positioning supporting mechanism and a screw mounting plate (32) of the oblique positioning mechanism; the right assembling plate (34) of the oblique positioning mechanism is fixedly connected with the fixed plate (31).