A clamping welding fixture for steering gear

Abstract

The invention discloses a clamping welding fixture for a steering gear, comprising a frame, two base plates are arranged on the frame, each base plate is respectively provided with a flange positioning mechanism, and the flange positioning mechanism is used to position the steering gear; the two base plates can realize the left-right symmetrical conversion of the steering gear through a displacement mechanism. The invention realizes the same fixture production of the left and right parts of the steering gear assembly by adopting the flange positioning mechanism and the displacement mechanism, solves the problem that the positioning pin is difficult to remove due to welding deformation, and solves the problems of large investment, large land occupation, and inconvenient switching and use of traditional two-station welding fixtures.

Description

Technical Field

[0001] The invention relates to the technical field of automobile processing and manufacturing, and in particular to a clamping and welding fixture for a steering gear. Background Art

[0002] In the production of automobile frames, the left and right steering gears are symmetrical parts. The structure of the steering gear is as follows: Figure 8 As shown, there are four steering flanges on the steering gear. The two flanges at the left end of the steering gear have a small distance between them, which is called the small end of the steering gear. The two flanges at the right end of the steering gear have a large distance between them, which is called the large end of the steering gear.

[0003] The traditional welding method uses four locating pins installed on the upper and lower base plates respectively and uses guide pillars and guide sleeves to position the assembly for positioning welding. Since the steering flange welding position requires high precision, the position accuracy of each flange is only allowed to have a deviation of +0.25mm. Therefore, the gap between the locating pin and the flange is small, with a gap of only 0.1~0.15mm. Both ends of the flange need to be positioned. After welding, due to welding deformation, the upper and lower sets of locating pins are difficult to remove from the assembly, resulting in difficulty in taking the part; at the same time, due to the symmetrical structure of the left and right parts, two sets of left and right welding fixtures need to be made, which need to occupy two welding stations, resulting in large investment and inconvenient switching. Summary of the invention

[0004] In order to solve the problems in the prior art, the present invention provides a pneumatic clamping welding fixture.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A clamping welding fixture for a steering gear comprises a frame, two base plates are arranged on the frame, each base plate is respectively provided with a flange positioning mechanism, and the flange positioning mechanism is used to position the steering gear;

[0007] The left-right symmetrical conversion of the steering gear can be achieved through the displacement mechanism between the two base plates.

[0008] Furthermore, the two substrates are respectively a fixed substrate and a movable substrate. The fixed substrate is located on the left side, and the fixed substrate extends to the right to form an extension portion. The extension portion is installed with a linear guide rail in the front and rear directions. The movable substrate is installed on the linear guide rail and slides with it. The movable substrate is connected with an adjustment rod in the front and rear directions, and the movable substrate is driven to move forward and backward by the adjustment rod to form the displacement mechanism.

[0009] Furthermore, a rotation and lifting positioning mechanism is provided between the fixed base plate and the frame;

[0010] The rotating and lifting positioning mechanism includes a connecting seat fixed at the left and right ends of the fixed base plate, the connecting seat is provided with a vertical slide groove, a movable positioning block is provided in the slide groove to slide up and down with the movable positioning block, and an up and down driving structure for driving the movable positioning block to move up and down is also provided between the movable positioning block and the connecting seat; a rotating shaft extending outward is fixed on the movable positioning block; an elastic limit pin is also fixed at the lower part of the connecting seat;

[0011] A vertically arranged support plate is fixed on the left and right sides of the frame, a central circular hole is provided at the upper end of the support plate, and the rotating shaft is installed at the corresponding central circular hole; a plurality of linear grooves are arranged around the central circular hole at the lower part of the support plate, and the linear grooves all extend radially outward, and the elastic limit pins are plugged into and matched with the linear grooves.

[0012] Furthermore, the up and down driving structure includes an adjusting screw which is vertically arranged and threaded through the connecting seat, and the end of the adjusting screw is rotatably connected to the movable positioning block.

[0013] Furthermore, the flange positioning mechanism is divided into a left flange positioning mechanism provided on the fixed base plate and a right flange positioning mechanism provided on the movable base plate;

[0014] The left flange positioning mechanism includes a left fixed seat installed on the fixed base plate, a left movable base is installed on the upper part of the left fixed seat through a vertical rotating shaft, an adjustment cylinder in the front-rear direction is installed on the left fixed seat and connected to the left movable base, and a limiting structure is provided to cooperate with the left movable base;

[0015] The left movable base and the fixed base plate correspond to each other up and down, and an upper clamping unit and a lower clamping unit are respectively installed on the left movable base and the fixed base plate;

[0016] The lower clamping unit includes two levers arranged in parallel, both of which extend in the left-right direction; the middle of the lever is installed on the lever support through a pin shaft, and the lever support is fixed to the fixed base plate; a vertical clamping cylinder is provided at the left end of the fixed base plate, and the clamping cylinder is connected to a connecting rod through a connecting head, and the connecting rod is extended in the front-back direction, and the two ends of the connecting rod are respectively connected to the left ends of the two levers; the right ends of the two levers are respectively connected to vertical moving shafts, and the moving shafts pass through the fixed base plate upward, and a positioning pin is provided at the end of the moving shaft;

[0017] The upper clamping unit and the lower clamping unit are arranged opposite to each other up and down;

[0018] The right flange positioning mechanism and the left flange positioning mechanism are arranged opposite to each other on the left and right sides, have the same structure, and have different sizes in the front-to-back direction; the left flange positioning mechanism corresponds to the two flanges at the small end of the steering gear, and the right flange positioning mechanism corresponds to the two flanges at the large end of the steering gear.

[0019] Furthermore, in the upper clamping unit, the distance between the left end connecting portion of the lever and the middle connecting portion of the lever is A1, and the distance between the right end connecting portion of the lever and the middle connecting portion of the lever is A2, and A1 is smaller than A2;

[0020] The distance between the left end connecting part of the lever and the middle connecting part of the lever in the lower clamping unit is B1, and the distance between the right end connecting part of the lever and the middle connecting part of the lever is B2, and B1 is greater than B2.

[0021] Further, the clamping cylinder is connected to the connecting rod through the connecting head as follows:

[0022] The connecting head includes a cylinder connecting head connected to the piston end of the clamping cylinder at the bottom, and an upper connecting head located above the cylinder connecting head. The cylinder connecting head and the upper connecting head are combined to form a connecting rod channel and a cylindrical cavity located in the middle of the connecting rod channel, and the axis of the cylindrical cavity is along the left and right directions; a cylinder is provided in the middle of the connecting rod, and the cylinder is located in the cylindrical cavity. The connecting rod passes through the connecting rod channel at the same time, and the connecting rod channel is larger than the connecting rod.

[0023] Furthermore, the positioning pins in the upper clamping unit and the lower clamping unit are secondary guide structures composed of two cone sections, including a guide portion at the end and a positioning portion connected to the guide portion.

[0024] Furthermore, the guide portion of the positioning pin in the lower clamping unit is longer, and the guide portion of the positioning pin in the upper clamping unit is shorter.

[0025] Beneficial effects of the present invention:

[0026] The present invention realizes the same fixture production of left and right parts of the steering gear assembly by adopting a flange positioning mechanism and a displacement mechanism, thereby solving the problem that the positioning pin is difficult to remove due to welding deformation, and solving the problems of large investment, large space occupation and inconvenient switching and use of traditional two-station welding fixtures. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is an overall top view of the present invention;

[0028] Figure 2 It is a front view of the rotary positioning mechanism of the present invention;

[0029] Figure 3 is a side view of the connecting seat in the present invention;

[0030] Figure 4 is a side view of the support plate of the present invention;

[0031] Figure 5 It is a front view of the flange positioning mechanism in the present invention;

[0032] Figure 6 It is a schematic diagram of the connection between the connector and the connecting rod in the present invention;

[0033] Figure 7 yes Figure 5 Side view of

[0034] Figure 8 is a schematic diagram of the steering flange.

[0035] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged, or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0037] like Figures 1 to 7 As shown, a clamping welding fixture for a steering gear of the present invention comprises a frame 1, on which two base plates are arranged, each base plate is provided with a flange positioning mechanism, and the flange positioning mechanism is used to position a workpiece. The two base plates can realize left-right symmetrical conversion of the workpiece through a displacement mechanism.

[0038] Specifically, the two substrates are a fixed substrate 8 and a movable substrate 10. The fixed substrate 8 is located on the left side and above the frame 1, and the fixed substrate 8 extends to the right to form an extension portion. The extension portion is installed with a linear guide rail 9 in the front and rear directions. The movable substrate 10 is installed on the linear guide rail 9 and slidably cooperates with the linear guide rail 9. The movable substrate 10 is connected to an adjustment rod 11 in the front and rear directions. The movable substrate is driven to move forward and backward by the adjustment rod 11 to form the displacement mechanism to achieve left-right symmetrical conversion of the workpiece, thereby adapting to the welding of left steering gear or right steering gear.

[0039] At the same time, a rotating and lifting positioning mechanism is provided between the fixed base plate 8 and the frame.

[0040] The rotating and lifting positioning mechanism includes a connecting seat 5 fixed at the left and right ends of a fixed base plate 8, the connecting seat 5 is provided with a vertical slide groove, the slide groove is provided with a movable positioning block 4 that slides up and down with the connecting seat 5, and an up and down driving structure that drives the movable positioning block 4 to move up and down is also provided between the movable positioning block 4 and the connecting seat 5; a rotating shaft 3 extending outward is fixed on the movable positioning block 4; an elastic limit pin 7 is also fixed to the lower part of the connecting seat 5.

[0041] A vertically arranged support plate 2 is also fixed on the left and right sides of the frame 1. A central circular hole 201 is provided at the upper end of the support plate 2, and the rotating shaft 3 is installed at the corresponding central circular hole 201; three linear grooves 202 are arranged around the central circular hole at the lower part of the support plate 2, and the linear grooves 202 all extend radially outward, and the elastic limit pin 7 is plugged into the linear groove 202.

[0042] In this embodiment, the up and down driving structure includes an adjusting screw 6 which is vertically arranged and threaded through the connecting seat, and the end of the adjusting screw 6 is rotatably connected to the movable positioning block 4.

[0043] The present invention improves the operability of the fixture by setting the above-mentioned rotating and lifting positioning mechanism. During welding, the movable fixed base plate 8 rotates around the rotating shaft 3, and the elastic stop pin 7 enters the linear groove on the support plate 2 after being in place, which can facilitate welding of welds at different positions. At the same time, the adjusting screw 6 can drive the movable positioning block 4 to move up and down at the position of the connecting seat 5, ensuring that the rotating shaft center at both ends is basically coaxial with the center of gravity of the welding fixture, and ensuring lightness when rotating the fixed base plate 8.

[0044] Specifically, the flange positioning mechanism is divided into a left flange positioning mechanism provided on the fixed base plate 8 and a right flange positioning mechanism provided on the movable base plate 10 .

[0045] Among them, the left flange positioning mechanism includes a left fixed seat 12 installed on the fixed base plate 8, a left movable base 15 is installed on the upper part of the left fixed seat 12 through a vertical rotating shaft 14, an adjustment cylinder 17 in the front and rear directions is installed on the left fixed seat 12 and connected to the left movable base 15, and a limit block 18 is provided to cooperate with the left movable base 15; when the adjustment cylinder 17 pushes the left movable base 15 to contact the limit block 18, it enters the working state.

[0046] The left movable base 15 and the fixed base plate 8 correspond to each other vertically, and an upper clamping unit and a lower clamping unit are respectively installed on the left movable base 15 and the fixed base plate 8.

[0047] The lower clamping unit includes two parallel levers 24, both of which extend in the left-right direction; the middle of the lever 24 is installed on the lever support 26 through a pin shaft 25, and the lever support 26 is fixed to the fixed base plate 8; the left end of the fixed base plate 8 is provided with a vertical clamping cylinder 19, and the clamping cylinder 19 is connected to the connecting rod 22 through a connecting head, and the connecting rod 22 is extended in the front-back direction. The two ends of the connecting rod 22 are respectively connected to the left ends of the two levers 24 through a fixed push rod 23 (the fixed push rod 23 is installed in a connecting hole at one end of the lever, and the connecting hole is a long hole along the axial direction of the lever, and the fixed push rod 23 can move in the connecting hole); the right ends of the two levers 24 are connected to the moving shaft connecting block 27 through a pin shaft 25 (the long hole is selected at the connection point), and one end of the moving shaft connecting block 27 is connected to the vertical moving shaft 28, and the moving shaft 28 passes through the fixed base plate 8 upward, and the end of the moving shaft 28 is provided with a lower positioning pin 30.

[0048] In this embodiment, the clamping cylinder 19 is connected to the connecting rod 22 through the connecting head as follows:

[0049] The connecting head includes a cylinder connecting head 20 whose lower part is connected to the piston end of the clamping cylinder, and an upper connecting head 21 located above the cylinder connecting head 20. The cylinder connecting head 20 and the upper connecting head 21 are combined to form a connecting rod channel and a cylindrical cavity located in the middle of the connecting rod channel, and the axis of the cylindrical cavity is along the left and right direction; a cylinder 221 is provided in the middle of the connecting rod 22, and the cylinder 221 is located in the cylindrical cavity. The connecting rod 22 is also passed through the connecting rod channel, and the size of the connecting rod channel is larger than the connecting rod.

[0050] Through the above arrangement, the cylindrical body 221 of the connecting rod 22 forms a cylindrical contact surface with the cylindrical cavity, and the cylinder connector 20 restricts the connecting rod 22 to rotate only around the axis of the cylinder; when there is a deviation in the flange length, the two ends of the connecting rod 22 are in different sizes when they are in place, and the end that arrives first is subjected to force to rotate the connecting rod 22 around the axis of the cylindrical contact surface, achieving force balance at both ends and balancing the forces on multiple flanges. The above arrangement achieves force balance on each set of flanges, which not only saves a set of cylinders, but also solves the problem of insufficient cylinder installation space and achieves lightweighting of the mechanism.

[0051] The upper clamping unit and the lower clamping unit are arranged opposite to each other in the upper and lower directions; the moving shaft 28 of the upper clamping unit passes downward through the left movable base 15 , and an upper positioning pin 29 is provided at the end of the moving shaft 28 .

[0052] At the same time, in this embodiment, the distance between the left end connection part of the lever and the middle connection part of the lever in the upper clamping unit is A1, and the distance between the right end connection part of the lever and the middle connection part of the lever is A2, and A1 is smaller than A2. The distance between the left end connection part of the lever and the middle connection part of the lever in the lower clamping unit is B1, and the distance between the right end connection part of the lever and the middle connection part of the lever is B2, and B1 is larger than B2.

[0053] Since the middle connection part of the lever 24 is different from the connection parts at both ends, the lower lever 24 is a force-increasing mechanism, and the upper part is a force-reducing mechanism (range-increasing mechanism). The upper lever increases the moving range of the positioning pin, and the lower lever increases the upward lifting force.

[0054] In this embodiment, the upper and lower positioning pins at the end of the moving shaft in the upper and lower clamping units are secondary guide structures composed of two cone sections, including a guide portion at the end and a positioning portion connected to the guide portion. At the same time, the guide portion of the lower positioning pin 30 is longer, and the guide portion of the upper positioning pin 29 is shorter. The longer guide portion of the lower positioning pin 30 can make the pipe more in line with the final state, and the shorter guide portion of the upper positioning pin 29 is more in line with avoidance.

[0055] During operation, the steering flange is placed on the guide part of the lower positioning pin 30, and the upper positioning pin 29 is higher than the upper end of the flange. During operation, the upper positioning pin 29 descends, and then the lower positioning pin 29 rises to push the flange to the end face of the movable base 15, and the positioning part of the lower positioning pin 30 enters the line of sight for accurate positioning. The upper and lower positioning pins are secondary guiding structures, and a primary guiding surface is added to the traditional positioning pin primary guiding mode, which can shorten the guiding length, increase the guiding tolerance, and effectively guide, which can ensure a large guiding tolerance size and reduce the guiding length.

[0056] The right flange positioning mechanism includes a right fixed seat 13 and a right movable base 16, etc. The right flange positioning mechanism and the left flange positioning mechanism are arranged opposite to each other on the left and right sides, have the same structure, and are different in size in the front-to-back direction. The left flange positioning mechanism corresponds to the two flanges at the small end of the steering gear, and the right flange positioning mechanism corresponds to the two flanges at the large end of the steering gear, which will not be described in detail here.

[0057] The working principle of the present invention is as follows:

[0058] When in use, the adjusting rod 11 is moved to move the movable base plate 10 forward and backward so that the fixture state is to produce a left steering gear or a right steering gear. At this time, the flange is placed in the lower positioning pin 30 on the fixed base plate 8, and the guide part of the lower positioning pin 30 enters the lower end of the flange, and the positioning part does not enter. Then the adjustment cylinder 17 is used to drive the left and right movable bases 15 / 16 to contact the limit block 18. At this time, the left and right movable bases 15 / 16 are coaxial with the corresponding upper and lower positioning pins 29 / 30 on the fixed base plate 8 and the movable base plate 10.

[0059] Then the clamping cylinder 19 drives the connecting rod 22 to rotate around the pin shaft 25, driving the upper positioning pin 29 to descend and enter the upper end hole of the flange. Then the corresponding lower clamping cylinder 19 drives the connecting rod 22 to rotate around the pin shaft 25, driving the lower positioning pin 30 to rise. The positioning support plate 31 on the lower positioning pin 30 drives the flange and the corresponding parts to rise to the upper end of the flange and contact the upper movable base. At this time, the positioning part of the lower positioning pin 30 is forced into the flange.

[0060] During welding, the movable fixed base plate 8 rotates around the rotating shaft 3, and the elastic limiting pin 7 enters the linear groove on the supporting plate 2 after being in place, which can facilitate welding of welds at different positions.

[0061] After welding is completed, the clamping cylinder 19 drives the connecting rod 22 to rotate around the pin shaft 25, driving the upper positioning pin 29 to rise and leave the upper end hole of the flange, and then the clamping cylinder 19 drives the connecting rod 22 to rotate around the pin shaft 25, driving the lower positioning pin 29 to descend and separate the positioning part from the lower end hole of the flange; the cylinder 17 drives the left and right movable bases 15 / 16 to open. At this time, the upper end of the workpiece is open and the positioning pin has no forced contact with the workpiece, which is convenient for taking the workpiece, and the next workpiece operation is carried out after the workpiece is taken out.

[0062] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

[0063] If the words "first", "second", etc. are used in this document to limit components, those skilled in the art should know that the use of "first" and "second" is only to facilitate the description of the present invention and simplify the description. Unless otherwise stated, the above words have no special meaning.

[0064] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0065] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A clamping welding fixture for a steering gear, characterized in that: It comprises a frame, on which two base plates are arranged, and each base plate is respectively provided with a flange positioning mechanism, and the flange positioning mechanism is used to position the steering gear; The left-right symmetric conversion of the steering gear can be achieved through the displacement mechanism between the two substrates; The two base plates are respectively a fixed base plate and a movable base plate, the fixed base plate is located on the left side, and the fixed base plate extends to the right to form an extension portion, the extension portion is installed with a linear guide rail in the front and rear directions, the movable base plate is installed on the linear guide rail and slidably cooperates with the linear guide rail, and the movable base plate is connected with an adjustment rod in the front and rear directions, and the movable base plate is driven to move forward and backward through the adjustment rod to form the displacement mechanism; A rotating and lifting positioning mechanism is provided between the fixed base plate and the frame; The rotating and lifting positioning mechanism includes a connecting seat fixed at the left and right ends of the fixed base plate, the connecting seat is provided with a vertical slide groove, a movable positioning block is provided in the slide groove to slide up and down with the movable positioning block, and an up and down driving structure for driving the movable positioning block to move up and down is also provided between the movable positioning block and the connecting seat; a rotating shaft extending outward is fixed on the movable positioning block; an elastic limit pin is also fixed at the lower part of the connecting seat; A vertically arranged support plate is fixed on the left and right sides of the frame, a central circular hole is provided at the upper end of the support plate, and the rotating shaft is installed at the corresponding central circular hole; a plurality of linear grooves are arranged around the central circular hole at the lower part of the support plate, and the linear grooves all extend radially outward, and the elastic limit pins are plugged into and matched with the linear grooves.

2. The clamping welding fixture for a steering gear according to claim 1, characterized in that: The up and down driving structure comprises an adjusting screw which is vertically arranged and threadedly passes through the connecting seat, and the end of the adjusting screw is rotatably connected with the movable positioning block.

3. The clamping welding fixture for a steering gear according to claim 1, characterized in that: The flange positioning mechanism is divided into a left flange positioning mechanism arranged on the fixed base plate and a right flange positioning mechanism arranged on the movable base plate; The left flange positioning mechanism includes a left fixed seat installed on the fixed base plate, a left movable base is installed on the upper part of the left fixed seat through a vertical rotating shaft, an adjustment cylinder in the front-rear direction is installed on the left fixed seat and connected to the left movable base, and a limiting structure is provided to cooperate with the left movable base; The left movable base and the fixed base plate correspond to each other up and down, and an upper clamping unit and a lower clamping unit are respectively installed on the left movable base and the fixed base plate; The lower clamping unit includes two levers arranged in parallel, both of which extend in the left-right direction; the middle of the lever is installed on the lever support through a pin shaft, and the lever support is fixed to the fixed base plate; a vertical clamping cylinder is provided at the left end of the fixed base plate, and the clamping cylinder is connected to a connecting rod through a connecting head, and the connecting rod is extended in the front-back direction, and the two ends of the connecting rod are respectively connected to the left ends of the two levers; the right ends of the two levers are respectively connected to vertical moving shafts, and the moving shafts pass through the fixed base plate upward, and a positioning pin is provided at the end of the moving shaft; The upper clamping unit and the lower clamping unit are arranged opposite to each other up and down; The right flange positioning mechanism and the left flange positioning mechanism are arranged opposite to each other on the left and right sides, have the same structure, and have different sizes in the front-to-back direction; the left flange positioning mechanism corresponds to the two flanges at the small end of the steering gear, and the right flange positioning mechanism corresponds to the two flanges at the large end of the steering gear.

4. The clamping welding fixture for a steering gear according to claim 3 is characterized in that: The distance between the left end connecting part of the lever and the middle connecting part of the lever in the upper clamping unit is A1, and the distance between the right end connecting part of the lever and the middle connecting part of the lever is A2, and A1 is smaller than A2; The distance between the left end connecting part of the lever and the middle connecting part of the lever in the lower clamping unit is B1, and the distance between the right end connecting part of the lever and the middle connecting part of the lever is B2, and B1 is greater than B2.

5. The clamping welding fixture for a steering gear according to claim 3, characterized in that: The arrangement mode in which the clamping cylinder is connected to the connecting rod via the connecting head is as follows: The connecting head includes a cylinder connecting head connected to the piston end of the clamping cylinder at the bottom, and an upper connecting head located above the cylinder connecting head. The cylinder connecting head and the upper connecting head are combined to form a connecting rod channel and a cylindrical cavity located in the middle of the connecting rod channel, and the axis of the cylindrical cavity is along the left and right directions; a cylinder is provided in the middle of the connecting rod, and the cylinder is located in the cylindrical cavity. The connecting rod passes through the connecting rod channel at the same time, and the connecting rod channel is larger than the connecting rod.

6. The clamping welding fixture for a steering gear according to claim 3, characterized in that: The positioning pins in the upper clamping unit and the lower clamping unit are secondary guide structures composed of two cone sections, including a guide part at the end and a positioning part connected to the guide part.

7. The clamping welding fixture for a steering gear according to claim 6, characterized in that: The guide portion of the positioning pin in the lower clamping unit is longer, and the guide portion of the positioning pin in the upper clamping unit is shorter.

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