Special assembly tool for welding front frame of loading machine

Abstract

The utility model belongs to the technical field of machining, and particularly relates to a special assembly tool for welding a front frame of a loading machine, which comprises a front support frame assembly, a front outer side vehicle body plate positioning frame assembly, a side support frame assembly and a rear outer side vehicle body plate positioning frame assembly which are sequentially arranged from front to back and are respectively and symmetrically arranged on the left side and the right side, a front inner side automobile body plate positioning frame assembly, a front inner positioning frame, a rear inner positioning frame and a rear supporting frame assembly are sequentially arranged from front to back along the left-right symmetrical center line. Rear inner side vehicle body plate positioning frame assemblies are symmetrically arranged on the left side and the right side of the rear supporting frame assembly, a shaft positioning assembly and a bottom positioning plate which are symmetrically arranged left and right are arranged between the side supporting frame assemblies on the two sides, and an edge positioning piece is arranged on the right side of a rear inner positioning frame; the utility model can be suitable for the integral welding operation of the front frame of the loading machine, and can improve the production efficiency and the welding precision, thereby reducing the production cost and improving the product quality.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing technology, and specifically relates to a special assembly tooling for welding the front frame of a loader. Background Technology

[0002] The front frame of a loader serves as the bridge connecting the working device and the rear frame, and is a key component for evaluating the performance of a loader. It is hinged to the rear frame via upper and lower traction plates. The front section houses the lifting cylinder, tipping cylinder, steering cylinder, boom, and other components. The relative positions and dimensions of the pin holes are crucial for the smooth operation of the entire mechanism. Furthermore, the drive axle and some hydraulic valves are also mounted on the front frame. Traditional splicing and welding methods cannot guarantee these critical dimensions and relative positions, and the clamping mechanisms for the front frame components are difficult to disassemble during welding, making it impossible to separate the loader after welding. Utility Model Content

[0003] This invention provides a special assembly tooling for welding the front frame of a loader, which can solve the problems pointed out in the background art.

[0004] A special assembly tooling for welding the front frame of a loader includes a front support frame assembly, a front outer body panel positioning frame assembly, a side support frame assembly, and a rear outer body panel positioning frame assembly arranged symmetrically on the left and right sides from front to back; a front inner body panel positioning frame assembly, a front inner positioning frame, a rear inner positioning frame, and a rear support frame assembly arranged symmetrically on the left and right sides of the rear support frame assembly; a rear inner body panel positioning frame assembly is symmetrically arranged on the left and right sides of the rear support frame assembly; a shaft positioning assembly and a bottom positioning plate are symmetrically arranged between the two side support frame assemblies; and a side positioning component is provided on the right side of the rear inner positioning frame.

[0005] The front support frame assembly is used for limiting and positioning the front frame axle mounting assembly. It includes a front support frame support base, a front support frame fixing clamping component, and a front support frame adjustable positioning component. The front support frame support base is provided with a plurality of positioning pins to provide positioning and limiting support. The front support frame fixing clamping component is used for clamping and fixing. The front support frame adjustable positioning component is used for positioning and limiting the outer side.

[0006] Both the front outer body panel positioning frame assembly and the rear outer body panel positioning frame assembly are used to limit and position the body panel from the outside, and they are adjustable positioning components for the front outer body panel.

[0007] The side support frame assembly is used for limiting and positioning the left and right wing boxes of the front frame. It includes a side support column, a boom positioning shaft, and a lifting cylinder positioning shaft. The left side support frame assembly has a right positioning frame, and the right side support frame assembly has a left positioning frame. A main positioning shaft is provided between the right and left positioning frames. The right positioning frame includes a right positioning frame seat, a right detachable bearing, and a movable push rod assembly. The movable push rod assembly is used to press inward against one end of the main positioning shaft. The left positioning frame includes a left positioning... The fixture includes a base, a left detachable bearing shell, and a limiting block. The limiting block is used to limit the other end of the main positioning shaft. The main positioning shaft includes a shaft body and a detachable spacer. The spacer is a semi-tubular structure with a positioning through hole in the middle, which can be installed radially onto the shaft body. The shaft body also has a positioning through hole in the middle. After the bushing is installed, a pin is used to fix the two together through two positioning holes. The spacer is installed at the exact center of the shaft body 361 in the axial direction, and after the main positioning shaft is pressed, the spacer is in the exact center of the entire fixture.

[0008] Both the boom positioning shaft and the lifting cylinder positioning shaft include a hollow shaft, a lead screw, an outer shaft body, a shaft positioning block, and an end cap flange. The shaft positioning block is fixed to the top of the hollow shaft. The hollow shaft and the lead screw are connected by threads, and the lead screw is used to adjust the telescopic length of the hollow shaft. The hollow shaft has a guide groove, and the outer shaft body has a threaded through hole for mounting bolts. The bolts extend through the outer shaft body into the guide groove of the hollow shaft. The end cap flange is fixed to the other end of the hollow shaft and mounted on the outer shaft body. The outer shaft body has a fixing flange at its end for mounting on the side support column via the outer shaft body flange. The boom positioning shaft and the lifting cylinder positioning shaft are respectively mounted on the inner side above and below the side support column via the outer shaft body flange.

[0009] Both the front inner side body panel positioning frame assembly and the rear inner side body panel positioning frame assembly are used to limit and position the body panel from the inside. They both include an inner side body panel base and a front inner side positioning plate that is hinged to the inner side body panel base. The end of the front inner side positioning plate is provided with a pressure head, which is flipped through the hinged connection to press the body panel.

[0010] The front inner positioning frame is used for limiting and positioning the valve mounting plate inside the front frame. Its upper surface is provided with a shaft pin, which is used for limiting and positioning.

[0011] The rear inner positioning frame is used for limiting and positioning the front frame fixed drive shaft bracket. It includes a rear inner positioning frame base, a rotating support, and a rear inner positioning plate. The rotating support is hinged to the rear inner positioning frame base, and the rear inner positioning plate is connected to the rotating support and rotates together with the rotating support. The rear inner positioning plate has a positioning hole that coincides with the drive shaft bracket mounting hole. Limiting and positioning are achieved by a detachable pin.

[0012] The rear support frame assembly is used for limiting and positioning the front frame traction plate assembly. It includes a rear support frame base, an upper hinge hole positioning shaft, a lower hinge hole positioning shaft, and a rear support frame fixing clamping component. The upper hinge hole positioning shaft and the lower hinge hole positioning shaft are respectively set at the upper and lower ends of the rear support frame base and are arranged in a stepped shape. The thin shaft end passes through the hinge hole of the front frame traction plate assembly to achieve hole positioning, and the thick shaft end contacts the lower surface panel of the upper and lower traction plates to ensure that the relative distance between the upper and lower traction plates is fixed. The rear support frame fixing clamping component is used for clamping and fixing.

[0013] The shaft positioning assembly is used for limiting and positioning the front support of the steering cylinder of the front frame. It includes a hollow riser tube and a positioning shaft disc with its lower end inserted into the hollow riser tube. The hollow riser tube is used for limiting and positioning the shaft hole of the steering cylinder front support. The positioning shaft disc is used to ensure the dimensional positioning of the positioning shaft disc in the height direction.

[0014] The bottom positioning plate is used to limit and position the lower traction plate to ensure its dimensional positioning in the height direction;

[0015] The side positioning component is used to position the side of the lower traction plate to ensure its dimensional positioning in the left and right directions.

[0016] Preferably, both the front support frame fixing clamping component and the rear support frame fixing clamping component include a fixed column, a rotating beam, and a pressure column. One end of the rotating beam is rotatably connected to the fixed column, allowing it to rotate around the fixed column; the other end is connected to the pressure column. The pressure column is connected to the rotating beam via a thread, so that its relative height to the rotating beam can be adjusted by rotating the thread, thereby achieving adjustment and clamping.

[0017] Preferably, the adjustable positioning assembly of the front support frame, the adjustable positioning assembly of the front outer body panel, the adjustable positioning assembly of the rear outer body panel, and the movable top rod assembly all include a base and a rotating shaft. The rotating shaft is connected to the base by a thread, and the relative distance between its end and the base can be adjusted by the thread to achieve adjustment and clamping.

[0018] Beneficial effects: This utility model provides a special assembly tooling for welding the front frame of a loader, which can be applied to the overall welding operation of the front frame of a loader, thereby improving production efficiency, improving welding accuracy, reducing production costs and improving product quality. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall design of this utility model.

[0020] Figure 2 This is a top view of the present invention.

[0021] Figure 3This is a partial limiting diagram of the present invention. Figure 1 ,

[0022] Figure 4 This is a partial limiting diagram of the present invention. Figure 2 ,

[0023] Figure 5 This is a cross-sectional schematic diagram of the boom positioning shaft and the lifting cylinder positioning shaft of this utility model.

[0024] Figure 6 This is a partial limiting diagram of the present invention. Figure 3 ,

[0025] Figure 7 This is a partial limiting diagram of the present invention. Figure 4 ,

[0026] Figure 8 This is a partial limiting diagram of the present invention. Figure 5 ,

[0027] Figure 9 This is a schematic diagram of the overall operation of this utility model. Figure 6 ,

[0028] Figure 10 This is a schematic diagram of the overall positioning of this utility model.

[0029] Explanation of reference numerals in the attached figures:

[0030] Figure labels: Front support frame assembly 1; Support frame support seat 11; Front support frame fixing clamping component 12; Fixing column 121; Rotating beam 122; Pressure column 123; Adjustable positioning assembly of front support frame 13; Base 131; Rotating shaft 132; Front outer body panel positioning frame assembly 2; Side support frame assembly 3; Side support column 31; Boom positioning shaft 32; Hollow shaft 321; Lead screw 322; Outer shaft body 323; Shaft positioning block 324; End cover flange 325; Lifting cylinder positioning shaft 33; Right positioning frame 34; Right positioning frame seat 341; Right detachable bearing shell 342; Movable top rod assembly 343; Left positioning frame 35; Left positioning base 351; Left detachable... 352; 353; 36; 361; 362; 4; 5; 6; 7; 8; 9; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 10; 10; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 10; 10; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 10; 10; 10; 10; 10; 10; 11; 12; 13; 14; 15; 16; 17; 18; 19; 10; 10; 10; 10; 10; 10; 11; 12; 10; 10; 10; 11; 12; 10; 10; 10; 11; 12; 10; 10; 10; 11; 12; 10; 10; 10; 10; 11; 10 ... Detailed Implementation

[0031] The following describes a specific embodiment of the present invention in detail with reference to the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0032] Example 1: As Figure 1-10 As shown in the figure, this utility model provides a special assembly tooling for welding the front frame of a loader, including a front support frame assembly 1, a front outer body panel positioning frame assembly 2, a side support frame assembly 3, and a rear outer body panel positioning frame assembly 4 arranged sequentially from front to back and symmetrically arranged on the left and right sides; a front inner body panel positioning frame assembly 5, a front inner positioning frame 6, a rear inner positioning frame 7, and a rear support frame assembly 8 arranged sequentially from front to back along its left and right symmetrical center line; a rear inner body panel positioning frame assembly 9 is symmetrically arranged on the left and right sides of the rear support frame assembly 8, and a shaft positioning assembly 10 and a bottom positioning plate 20 are symmetrically arranged between the two side support frame assemblies 3 respectively; a side positioning member 30 is provided on the right side of the rear inner positioning frame 7;

[0033] The front support frame assembly 1 is used for limiting and positioning the front frame axle mounting assembly. It includes a front support frame support base 11, a front support frame fixing clamping member 12, and a front support frame adjustable positioning assembly 13. The front support frame support base 11 is provided with a plurality of positioning pins to provide positioning and limiting support. The front support frame fixing clamping member 12 is used for clamping and fixing. The front support frame adjustable positioning assembly 13 is used for positioning and limiting the outer side.

[0034] The front outer side body panel positioning frame assembly 2 and the rear outer side body panel positioning frame assembly 4 are both used to limit and position the body panel from the outside, and they are adjustable positioning components for the front outer side body panel.

[0035] The side support frame assembly 3 is used for limiting and positioning the left and right wing boxes of the front frame. It includes a side support column 31, a boom positioning shaft 32, and a lifting cylinder positioning shaft 33. The left side support frame assembly 3 is provided with a right positioning frame 34, and the right side support frame assembly 3 is provided with a left positioning frame 35. A main positioning shaft 36 is provided between the right positioning frame 34 and the left positioning frame 35. The right positioning frame 34 includes a right positioning frame seat 341, a right detachable bearing shell 342, and a movable push rod assembly 343. The movable push rod assembly 343 is used to press one end of the main positioning shaft 36 inward. The left positioning frame 35 includes a left positioning base 351, a left detachable bearing shell 352, and a limiting block 353. The limiting block 353 is used for... The left detachable bearing shell 352 and the right detachable bearing shell 342, which are limited at the other end of the main positioning shaft 36, each include a seat and a hinged bearing shell. The hinged movement facilitates the insertion and removal of the main positioning shaft 36, similar to a clamp structure. The main positioning shaft 36 includes a shaft body 361 and a detachable spacer 362. The spacer 362 is a semi-tubular structure with a positioning through hole in the middle, which can be installed radially onto the shaft body 361. The shaft body 361 has a positioning through hole in the middle. After the bushing is installed, a pin is used to fix the two through the two positioning holes. The spacer 362 is installed at the exact center of the shaft body 361 in the axial direction, and after the main positioning shaft 36 is pressed, the spacer 362 is in the exact center of the entire tooling.

[0036] Both the boom positioning shaft 32 and the lifting cylinder positioning shaft 33 include a hollow shaft 321, a lead screw 322, an outer shaft body 323, a shaft positioning block 324, and an end cap flange 325. The shaft positioning block 324 is fixed to the top of the hollow shaft 321 and is stepped or conical in shape. The hollow shaft 321 and the lead screw 322 are connected by threads. The lead screw 322 is used to adjust the extension and retraction length of the hollow shaft 321. The hollow shaft 321 has a guide groove, and the outer shaft body 325... 23 is provided with a threaded through hole for mounting bolts, and the bolts extend through the outer shaft body 323 into the guide groove of the hollow shaft 321; the end cover flange 325 is fixed to the other end of the hollow shaft 321 and mounted on the outer shaft body 323; the outer shaft body 323 has a fixing flange at its port for mounting on the side support column 31 through the outer shaft body flange; the boom positioning shaft 32 and the lifting cylinder positioning shaft 33 are respectively mounted on the inner side above and below the side support column 31 through the outer shaft flange;

[0037] Both the front inner side body panel positioning frame assembly 5 and the rear inner side body panel positioning frame assembly 9 are used to limit and position the body panel from the inside. They both include an inner side body panel base 51 and a front inner side positioning plate 52 that is hinged to the inner side body panel base 51. The end of the front inner side positioning plate 52 is provided with a pressure head, which is flipped through the hinged connection to press the body panel.

[0038] The front inner positioning bracket 6 is used for limiting and positioning the valve mounting plate inside the front frame. Its upper surface is provided with a shaft pin, which is used for limiting and positioning.

[0039] The rear inner positioning frame 7 is used for limiting and positioning the front frame fixed drive shaft bracket. It includes a rear inner positioning frame base 71, a rotating support 72, and a rear inner positioning plate 73. The rotating support 72 is hinged to the rear inner positioning frame base 71, and the rear inner positioning plate 73 is connected to the rotating support 72 and rotates together with the rotating support 72. The rear inner positioning plate 73 has a positioning hole that coincides with the drive shaft bracket mounting hole. Limiting and positioning are achieved by a detachable pin.

[0040] The rear support frame assembly 8 is used for limiting and positioning the front frame traction plate assembly. It includes a rear support frame base 81, an upper hinge hole positioning shaft 82, a lower hinge hole positioning shaft 83, and a rear support frame fixing clamping member 84. The upper hinge hole positioning shaft 82 and the lower hinge hole positioning shaft 83 are respectively set at the upper and lower ends of the rear support frame base 81 and are arranged in a stepped shape. The thin shaft end passes through the hinge hole of the front frame traction plate assembly to achieve hole positioning, and the thick shaft end contacts the lower surface panel of the upper and lower traction plates to ensure that the relative distance between the upper and lower traction plates is fixed. The rear support frame fixing clamping member 84 is used for clamping and fixing.

[0041] The shaft positioning assembly 10 is used for limiting and positioning the front support of the steering cylinder of the front frame. It includes a hollow riser 101 and a positioning shaft disc 102 with its lower end inserted into the hollow riser 101. The hollow riser 101 is used for limiting and positioning the shaft hole of the steering cylinder front support. The positioning shaft disc 102 is used to ensure the dimensional positioning of the positioning shaft disc 102 in the height direction.

[0042] The bottom positioning plate 20 is used to limit and position the lower traction plate to ensure its dimensional positioning in the height direction;

[0043] The side positioning member 30 is used to position the side of the lower traction plate to ensure its dimensional positioning in the left and right directions.

[0044] Specifically, both the front support frame fixing clamping member 12 and the rear support frame fixing clamping member 84 include a fixing column 121, a rotating beam 122, and a pressure column 123. One end of the rotating beam 122 is rotatably connected to the fixing column 121, allowing it to rotate around the fixing column 121; the other end is connected to the pressure column 123. The pressure column 123 is connected to the rotating beam 122 by threads, so that its relative height to the rotating beam 122 can be adjusted by rotating the threads, thereby achieving adjustment and clamping.

[0045] Specifically, the adjustable positioning assembly 13 of the front support frame, the adjustable positioning assembly of the front outer body panel, the adjustable positioning assembly of the rear outer body panel, and the movable top rod assembly 343 all include a base 131 and a rotating shaft 132. The rotating shaft 132 is connected to the base 131 by a thread. The relative distance between the end of the rotating shaft 132 and the base 131 can be adjusted by the thread to achieve adjustment and clamping.

[0046] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A special assembly tooling for welding the front frame of a loader, characterized in that: It includes a front support frame assembly (1), a front outer body panel positioning frame assembly (2), a side support frame assembly (3), and a rear outer body panel positioning frame assembly (4) arranged sequentially from front to back and symmetrically arranged on the left and right sides respectively; along its left and right symmetrical center line, a front inner body panel positioning frame assembly (5), a front inner positioning frame (6), a rear inner positioning frame (7), and a rear support frame assembly (8) are arranged sequentially from front to back; the rear support frame assembly (8) is symmetrically arranged on the left and right sides with a rear inner body panel positioning frame assembly (9), and a shaft positioning assembly (10) and a bottom positioning plate (20) are respectively symmetrically arranged between the two side support frame assemblies (3); the rear inner positioning frame (7) is provided with a side positioning member (30) on the right side. The front support frame assembly (1) is used for limiting and positioning the front frame axle mounting assembly. It includes a front support frame support base (11), a front support frame fixing clamping member (12), and a front support frame adjustable positioning assembly (13). The front support frame support base (11) is provided with several positioning pins to provide positioning and limiting support. The front support frame fixing clamping member (12) is used for clamping and fixing. The front support frame adjustable positioning assembly (13) is used for positioning and limiting the outer side. The front outer body panel positioning frame assembly (2) and the rear outer body panel positioning frame assembly (4) are both used to limit and position the body panel from the outside, and are adjustable positioning components for the front outer body panel. The side support frame assembly (3) is used for limiting and positioning the left and right wing boxes of the front frame. It includes a side support column (31), a boom positioning shaft (32), and a lifting cylinder positioning shaft (33). The left side support frame assembly (3) is provided with a right positioning frame (34), and the right side support frame assembly (3) is provided with a left positioning frame (35). A main positioning shaft (36) is provided between the right positioning frame (34) and the left positioning frame (35). The right positioning frame (34) includes a right positioning frame seat (341), a right detachable bearing shell (342), and a movable push rod assembly (343). The movable push rod assembly (343) is used to push against one end of the main positioning shaft (36) inward. The left positioning frame (35) includes a left... The fixture includes a positioning base (351), a left detachable bearing shell (352), and a limiting block (353). The limiting block (353) is used to limit the other end of the main positioning shaft (36). The main positioning shaft (36) includes a shaft body (361) and a detachable spacer (362). The spacer (362) is a semi-tubular structure with a positioning through hole in the middle, which can be installed radially onto the shaft body (361). The shaft body (361) has a positioning through hole in the middle. After the bushing is installed, a pin is used to fix the two through the two positioning holes. The spacer (362) is installed at the center of the shaft body (361) in the axial direction, and after the main positioning shaft (36) is pressed, the spacer (362) is in the center of the entire fixture. Both the boom positioning shaft (32) and the lifting cylinder positioning shaft (33) include a hollow shaft (321), a lead screw (322), an outer shaft body (323), a shaft positioning block (324), and an end cover flange (325). The shaft positioning block (324) is fixed to the top of the hollow shaft (321). The hollow shaft (321) and the lead screw (322) are connected by threads. The lead screw (322) is used to adjust the extension and retraction length of the hollow shaft (321). The hollow shaft (321) has a guide groove, and the outer shaft body (323) The shaft is provided with threaded through holes for mounting bolts, which extend through the outer shaft body (323) into the guide groove of the hollow shaft (321); the end cover flange (325) is fixed to the other end of the hollow shaft (321) and mounted on the outer shaft body (323); the outer shaft body (323) has a fixed flange at its port for mounting on the side support column (31) through the outer shaft body flange; the boom positioning shaft (32) and the lifting cylinder positioning shaft (33) are respectively mounted on the inner side above and below the side support column (31) through the outer shaft body flange; The front inner side body panel positioning frame assembly (5) and the rear inner side body panel positioning frame assembly (9) are both used to limit and position the body panel from the inside. They both include an inner side body panel base (51) and a front inner side positioning plate (52) that is hinged to the inner side body panel base (51). The end of the front inner side positioning plate (52) is provided with a pressure head, which is flipped through the hinged connection to press the body panel. The front inner positioning frame (6) is used for limiting and positioning the valve mounting plate inside the front frame. Its upper surface is provided with a shaft pin, which is used for limiting and positioning. The rear inner positioning frame (7) is used for limiting and positioning the front frame fixed drive shaft bracket. It includes a rear inner positioning frame base (71), a rotating support (72), and a rear inner positioning plate (73). The rotating support (72) is hinged to the rear inner positioning frame base (71), and the rear inner positioning plate (73) is connected to the rotating support (72) and rotates together with the rotating support (72). The rear inner positioning plate (73) has a positioning hole that coincides with the drive shaft bracket mounting hole. Limiting and positioning are achieved through a detachable pin. The rear support frame assembly (8) is used for limiting and positioning the front frame traction plate assembly. It includes a rear support frame base (81), an upper hinge hole positioning shaft (82), a lower hinge hole positioning shaft (83), and a rear support frame fixing clamping member (84). The upper hinge hole positioning shaft (82) and the lower hinge hole positioning shaft (83) are respectively set at the upper end and lower end of the rear support frame base (81) and are arranged in a stepped manner. The thin shaft end passes through the hinge hole of the front frame traction plate assembly to achieve hole positioning, and the thick shaft end contacts the lower surface panel of the upper and lower traction plates to ensure that the relative distance between the upper and lower traction plates is fixed. The rear support frame fixing clamping member (84) is used for pressing and fixing. The shaft positioning assembly (10) is used for limiting and positioning the front support of the steering cylinder of the front frame, including a hollow riser (101) and a positioning shaft disc (102) with its lower end inserted into the hollow riser (101). The hollow riser (101) is used for limiting and positioning the shaft hole of the steering cylinder front support, and the positioning shaft disc (102) is used to ensure the dimensional positioning of the positioning shaft disc (102) in the height direction. The bottom positioning plate (20) is used for limiting and positioning the lower traction plate to ensure its dimensional positioning in the height direction; The side positioning element (30) is used to position the side of the lower traction plate to ensure its dimensional positioning in the left and right directions.

2. The special assembly tooling for welding the front frame of a loader according to claim 1, characterized in that: The front support frame fixing clamping member (12) and the rear support frame fixing clamping member (84) both include a fixing column (121), a rotating beam (122) and a pressure column (123). One end of the rotating beam (122) is rotatably connected to the fixing column (121) so that it can rotate around the fixing column (121); the other end is connected to the pressure column (123). The pressure column (123) is connected to the rotating beam (122) by a thread so that its relative height to the rotating beam (122) can be adjusted by rotating the thread to achieve adjustment and clamping.

3. The special assembly tooling for welding the front frame of a loader according to claim 1, characterized in that: The adjustable positioning assembly (13) of the front support frame, the adjustable positioning assembly of the front outer body panel, the adjustable positioning assembly of the rear outer body panel, and the movable top rod assembly (343) all include a base (131) and a rotating shaft (132). The rotating shaft (132) is connected to the base (131) by a thread. The relative distance between the end of the rotating shaft (132) and the base (131) can be adjusted by the thread to achieve adjustment and pressing.

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