A precise clamping and positioning device for welding metal fittings of a forklift truck

Abstract

The present application relates to a kind of forklift metal fittings welding precision clamping positioning device, it is related to forklift accessory processing technical field.The frame is rotatably connected with the rotating frame in the drive box in the left and right sides of the frame, hydraulic push rod is installed in the rotating frame boss groove, the output end of the hydraulic push rod is connected with mounting plate;Through adjusting assembly and mounting frame cooperation, push column synchronously drives multiple groups of mounting frame displacement, cooperate hydraulic push rod to complete height adjustment, different size skeleton can be quickly adapted, through oil adjusting structure cooperates swing bar, counterweight operation, relies on gravity and rotating frame inclination to make swing bar inclination, extruding hydraulic oil pushes oil push rod four and cooperates spring to drive moving plate compensation clamping gap, effectively eliminate clamping loose problem, keep firm clamping during rotating frame rotation.

Description

Technical Field

[0001] This invention relates to the field of forklift parts processing technology, specifically to a precision clamping and positioning device for welding metal parts for forklifts. Background Technology

[0002] The forklift cab frame is a core metal load-bearing component of a forklift. Its overall structure is irregular and its size varies. During the welding process, the clamping and positioning accuracy and clamping stability affect the welding quality of the frame and the overall assembly quality.

[0003] Existing precision clamping and positioning devices for welding metal parts on forklifts require the forklift cab frame to be installed one by one during actual operation. Clamping tools are then used for positioning and clamping. Since different forklift specifications result in different forklift cab frame dimensions, the clamping position needs to be adjusted individually, which is time-consuming and not conducive to synchronous adaptive adjustment of clamping and positioning according to different forklift cab frame sizes. Furthermore, existing precision clamping and positioning devices for welding metal parts on forklifts experience wear during prolonged clamping, leading to gaps between the device and the forklift cab frame, affecting clamping stability. Additionally, when adjusting the welding angle of the forklift cab frame, it is prone to detachment, reducing welding precision.

[0004] To address the aforementioned issues, innovative designs are urgently needed based on existing approaches. Summary of the Invention

[0005] The purpose of this invention is to provide a precise clamping and positioning device for welding metal parts for forklifts, so as to solve the problems mentioned in the background. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a precision clamping and positioning device for welding metal parts of a forklift, comprising a frame, a rotating frame rotatably connected to the drive housing on both sides of the frame, a hydraulic push rod installed in the groove of the rotating frame's protrusion, the output end of the hydraulic push rod connected to a mounting plate, a plurality of adjusting slots equidistantly spaced in the circular groove at the top of the mounting plate, each adjusting slot being connected to a mounting bracket via an adjusting assembly, an oil tank fixedly installed on the left side of the mounting plate, an oil push rod elastically and slidably installed in the sealed cavity of the oil tank, and each mounting bracket having two horizontal sections on one side. Each of the convex rods has a clamping plate slidably connected to its sliding groove via a rotating screw. Each clamping plate has a stop block slidably connected to its sliding hole via an electric push rod. A movable plate is slidably installed in the opening on the side of the stop block opposite to the convex part of the clamping plate. A swing rod is rotatably connected to the cavity of the rotating frame. An oil tank is installed in the groove of the swing rod. An oil push rod is slidably installed in the sealed cavity of the oil tank. A counterweight is abutted to the output end of the oil push rod. The counterweight is slidably installed on the outside of the swing rod. A protrusion is threaded to the right side of the swing rod. An oil adjustment component is provided between the protrusion and each stop block.

[0007] Optionally, the hydraulic push rod is connected to an external hydraulic drive source via a hose, and the bottom of the mounting plate slides vertically through a protruding rod and a circular sliding hole in the rotating bracket.

[0008] Optionally, the positions of the plurality of adjustment slots correspond to the diagonal positions of the four corners of the mounting plate, and the four corner positions of the four mounting brackets correspond to the diagonal positions of the four corners of the mounting plate.

[0009] Optionally, the four mounting brackets are slidably connected to each other by horizontal sliding rods, and the mounting brackets and the grooves on the surface of the horizontal sliding rods are slidably limited at the joints. Each mounting bracket is provided with a square plate at the top, and the square plate at the top of the mounting bracket is used for the installation of relevant welding fixtures at the top.

[0010] Optionally, the adjustment assembly includes four screws, all of which are rotatably installed in the adjustment groove. Each of the four screws is threaded with a push post on its outer side, which is slidably installed in the adjustment groove. Each of the four screws is fitted with a bevel tooth on its outer side at one inward end, and a bevel tooth is engaged below the bevel tooth. The bevel tooth is fixed to the bottom of the mounting plate by a motor.

[0011] Optionally, the upper notch of each push post is fixedly connected to the inner side of the vertical rod of the mounting bracket at the corresponding position. The number of the first conical teeth and the second screw corresponds to the number of the adjusting grooves, and all four sets of the first conical teeth mesh with the second conical teeth.

[0012] Optionally, the leftmost two sets of push rods abut against the horizontal plate at the output end of the oil push rod, and the inner cavity of the first oil tank is connected to the inner cavity of the second oil tank through a hose.

[0013] Optionally, the oil adjustment assembly includes two symmetrical oil tanks three fixed in the cavity of the rotating frame. Each oil tank three is slidably connected to an oil push rod three by a spring seal. One end of each of the two symmetrical oil push rods three is connected to a protrusion two, and one end of each of the two symmetrical protrusion two is in contact with a protrusion one.

[0014] Optionally, the oil regulating assembly further includes an oil tank four that is installed through the other side of each abutment block. An oil push rod four is slidably installed in each oil tank four. The sliding end of the oil push rod four is connected to the moving plate through a spring. The inner cavity of each oil tank three is connected to the inner cavity of each oil tank four through a distributor, a hose and an electrically controlled valve.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] This invention, through the coordinated operation of the adjustment components, mounting frames, push columns, and hydraulic push rods, can simultaneously achieve the positioning and clamping of the frame by the clamping plates and abutments, as well as size adaptation. The movement of the push columns pushes four sets of mounting frames to move along the diagonal of the mounting plate. At the same time, the hydraulic push rods adjust the height of the mounting plate. The motor drives the second bevel gear to rotate, which in turn drives the first bevel gear meshing with the second bevel gear to rotate. The corresponding screw second drives the four push columns to adjust their positions synchronously, so that multiple mounting frames can adjust their positions synchronously with each other. With the help of the hydraulic push rods, bidirectional adjustment of horizontal position and vertical height is achieved, so that the mounting frames and the clamping plates and abutments on the mounting frames can meet the requirements of rapid clamping position adjustment for frames of different sizes.

[0017] This invention utilizes the cooperation between the hydraulic adjustment component, the swing arm, the counterweight, and the first protrusion. When the mounting frame is moved and adjusted, the second hydraulic pusher pushes the counterweight to slide and adjust its position on the swing arm, changing the leverage arm of the counterweight on the swing arm. As the swing arm tilts due to gravity, the first protrusion on the swing arm abuts against the second protrusion, delivering hydraulic oil from the third hydraulic tank to multiple fourth hydraulic tanks on the mounting frame. Subsequently, the fourth hydraulic pusher of the fourth hydraulic tank automatically adjusts its position according to the oil pressure change and compensates for the gap between the abutment and the frame by pushing the moving plate with a spring, thereby tightening the frame and preventing gaps between the abutment and the frame that could cause loosening of the clamp. At the same time, after the rotating frame tilts, it tightens the frame, improving the welding stability of the frame at different angles. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2This is a schematic diagram of the rotating frame and mounting frame structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the disassembled structure of the mounting plate and mounting bracket of the present invention;

[0021] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0022] Figure 5 This is a schematic diagram of the disassembled structure of screw two, push post, bevel tooth one, and bevel tooth two of the present invention;

[0023] Figure 6 This is a schematic diagram of the internal structure of the rotating frame of the present invention;

[0024] Figure 7 This is a schematic diagram of the pusher column, oil tank, and swing arm structure of the present invention;

[0025] Figure 8 This is a cross-sectional structural diagram of the oil tank and oil push rod of the present invention;

[0026] Figure 9 This is a schematic diagram of the mounting frame, clamping plate, and abutment structure of the present invention;

[0027] Figure 10 This is a schematic diagram of the cross-sectional structure of the abutment block of the present invention;

[0028] Figure 11 This is a schematic diagram showing the disassembled cross-sectional structure of the clamping plate, the abutment block, and the movable plate of the present invention.

[0029] In the diagram: 1. Frame; 2. Turning frame; 3. Mounting plate; 4. Hydraulic push rod; 5. Mounting bracket; 51. Screw 1; 6. Adjustment groove; 71. Screw 2; 72. Push column; 73. Bevel gear 1; 74. Bevel gear 2; 8. Hydraulic push rod 1; 9. Hydraulic tank 1; 10. Swing rod; 11. Hydraulic tank 2; 12. Hydraulic push rod 2; 13. Counterweight; 14. Protrusion 1; 151. Hydraulic tank 3; 152. Hydraulic push rod 3; 153. Protrusion 2; 154. Hydraulic tank 4; 155. Hydraulic push rod 4; 16. Clamping plate; 17. Abutment block; 18. Moving plate. Detailed Implementation

[0030] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description is provided in conjunction with the accompanying drawings and preferred embodiments, based on the specific implementation methods, structure, features, and effects of the present invention.

[0031] Example 1

[0032] Please see Figures 1 to 11This invention provides a technical solution: a precision clamping and positioning device for welding metal parts for forklifts, comprising a frame 1, with a rotating frame 2 rotatably connected to the drive boxes on both sides of the frame 1. A hydraulic push rod 4 is installed in the groove of the rotating frame 2's boss, and the output end of the hydraulic push rod 4 is connected to a mounting plate 3. The hydraulic push rod 4 is connected to an external hydraulic drive source via a hose. The bottom of the mounting plate 3 slides vertically through a protruding rod and a circular sliding hole in the boss of the rotating frame 2. Multiple adjustment slots 6 are equidistantly spaced circumferentially within the circular groove at the top of the mounting plate 3. Each adjustment slot 6 is adjusted... The assembly is connected to mounting brackets 5. Multiple adjustment slots 6 are positioned corresponding to the diagonal corners of the mounting plate 3. The four mounting brackets 5 are positioned at the same corners as the mounting plate 3. The four adjacent mounting brackets 5 are slidably connected via horizontal sliding rods. The mounting brackets 5 and the horizontal sliding rods have recessed sliding connections with each other. Each mounting bracket 5 has a square plate at its top, used for mounting related welding fixtures. An oil tank 9 is fixedly mounted on the left side of the mounting plate 3. An oil push rod 8 is elastically slidably installed in the inner cavity. Each mounting bracket 5 has a clamping plate 16 slidably connected to its upper and lower two transverse convex rod grooves via a rotating screw 51. A stop block 17 is slidably connected to the sliding hole of each clamping plate 16 via an electric push rod. A movable plate 18 is slidably installed in the opening on the opposite side of the stop block 17 and the protrusion on the clamping plate 16. The adjustment assembly includes four screws 71, all rotatably installed in the adjustment groove 6. A push post 72 is threaded onto the outer side of each of the four screws 71. The leftmost front... The last two sets of push rods 72 abut against the horizontal plate at the output end of the oil push rod 8. The push rods 72 are slidably installed in the adjusting groove 6. The four screw rods 71 ​​are all equipped with bevel teeth 73 on the outer side of their inner ends. The bevel teeth 74 are engaged below the bevel teeth 73. The bevel teeth 74 are fixed to the bottom of the mounting plate 3 by a motor. The notch at the upper end of each push rod 72 is fixedly connected to the inner side of the vertical rod of the mounting bracket 5 at the corresponding position. The number of bevel teeth 73 and screw rods 71 ​​corresponds to the number of adjusting grooves 6. All four sets of bevel teeth 73 are engaged with bevel teeth 74.

[0033] The forklift cab frame is installed on the rotating frame 2 above the frame 1. The positions of the four mounting brackets 5 are adjusted according to the frame's dimensions. Hydraulic push rods 4 push the mounting plates 3 to adjust their height. Based on the actual dimensions of the frame, screw 51 is rotated to fine-tune the position of the clamping plate 16. Simultaneously, an electric push rod moves the abutment 17, which, in conjunction with the protrusions on the clamping plate 16, clamps the frame, improving the clamping accuracy. Then, the motor in the drive box on the frame 1 drives the rotating frame 2 to rotate, adjusting the angle of the frame on the rotating frame 2 to facilitate welding. After the rotating frame 2 tilts during rotation, the swing arm 10 tilts, contacting the oil push rod 152 in the oil tank 151, thus squeezing oil into the oil tank 154. In the middle, the oil push rod 155 in the oil tank 154 pushes the moving plate 18 to move on the abutment block 17, which in turn increases the clamping force on the frame. When the frame size is large, the motor drives the bevel gear 74 to rotate. The bevel gear 74 meshes with the four bevel gears 73, which drive the four bevel gears 73 to rotate, and in turn drive the corresponding screw 71 to rotate. After the screw 71 rotates, the corresponding push column 72 slides in the adjustment groove 6. The push column 72 drives the mounting frame 5 to move in position. Adjacent mounting frames 5 are connected by a horizontal sliding rod for concave and convex limit sliding connection. The four mounting frames 5 move in sync with the push column 72, so that the mounting frame 5 is closer to the frame, thus enabling the mounting frame 5 to adapt to frames of different sizes and improve adaptability.

[0034] Example 2

[0035] Based on Example 1, please refer to Figures 1 to 11 A swing arm 10 is rotatably connected inside the cavity of the rotating frame 2. An oil tank 11 is installed in the groove of the swing arm 10. An oil push rod 12 is elastically and slidably installed inside the sealed cavity of the oil tank 11. The cavity of the first oil tank 9 is connected to the cavity of the second oil tank 11 via a hose. A counterweight 13 is abutted to the output end of the oil push rod 12. The counterweight 13 is slidably installed on the outside of the swing arm 10. A protrusion 14 is threadedly connected to the right side of the swing arm 10. An oil regulating component is provided between the protrusion 14 and each abutment 17. The oil regulating component includes two symmetrical oil tanks 151 fixed in the cavity of the rotating frame 2. Each oil tank 151 contains... The oil push rod 152 is slidably connected by a spring seal. The two symmetrical oil push rods 152 are connected to the inner end of the two protrusions 153. The inner end of the two symmetrical protrusions 153 is in contact with the protrusion 14. The oil regulating assembly also includes an oil tank 154 that is installed through the other side of each abutment 17. An oil push rod 155 is slidably installed in each oil tank 154. The sliding end of the oil push rod 155 in the abutment 17 is connected to the moving plate 18 by a spring. The inner cavity of each oil tank 151 is connected to the inner cavity of each oil tank 154 by a distributor, a hose and an electric valve.

[0036] When the mounting bracket 5 is adjusted, the two sets of push rods 72 on the left side will abut against the first oil push rod 8. The first oil push rod 8 pushes the oil inside the first oil tank 9, causing the oil to enter the second oil tank 11. The second oil push rod 12 in the second oil tank 11 moves with the input of the corresponding oil. The second oil push rod 12 pushes the counterweight 13 to move to the corresponding position on the swing arm 10. When the drive box on the frame 1 drives the rotating frame 2 to rotate, the rotating frame 2 tilts. At this time, under the influence of the force of the counterweight 13 on the lever arm of the swing arm 10 after the position of the counterweight 13 has moved, the swing arm 10 tilts, and the first protrusion 14 abuts against the second protrusion 153 on one side. The second protrusion 153 is connected to the third oil push rod 152. The third oil push rod 152 pushes the oil in the third oil tank 151, causing the oil to flow into the second oil tank 11. The oil in the liquid tank 3 151 is transferred to the oil tank 4 154 on the mounting bracket 5, causing the oil push rod 4 155 in the oil tank 4 154 to adjust its position accordingly. The oil push rod 4 155 abuts against the moving plate 18 through a spring. When a clamping gap occurs, the moving plate 18 extends out from the opening on the surface of the abutment block 17, and works with the abutment block 17 to further tighten the skeleton and increase the clamping force. When there is no gap, the elastic connection between the moving plate 18 and the oil push rod 4 155 allows the moving plate 18 to adjust its position elastically and will not extend out from the opening on the surface of the abutment block 17. The abutment block 17 continues to clamp the skeleton. When the rotating bracket 2 is tilted to adjust the angle, the clamping force of the abutment block 17 and the clamping plate 16 on the skeleton is increased, improving the stability of the skeleton during the welding process.

[0037] Working principle: When using this forklift metal parts welding precision clamping and positioning device, firstly, during operation, the forklift cab frame is placed on the rotating frame 2 installed above the frame 1. According to the actual size of the frame, the hydraulic push rod 4 drives the mounting frame 5 to complete the initial height position adjustment, so that the welding fixture installed on the square plate at the top of the mounting frame 5 is adjusted to the corresponding position according to the top of the frame. By rotating the screw 51, the position of the clamping plate 16 is finely adjusted to fit the frame according to the size. The electric push rod drives the abutment 17 to move, so that the abutment 17 and the protruding structure of the clamping plate 16 cooperate with each other to form an initial clamping and fixing of the frame, improving the positioning accuracy of the clamping plate 16 and the abutment 17 with the frame. After the frame clamping and positioning is completed, the motor inside the drive box of the frame 1 is started to drive the rotating frame 2 to rotate, and the welding angle of the frame on the rotating frame 2 is adjusted to meet the welding operation requirements of different angles.

[0038] Based on the above, when the frame size is large, the motor drives the second bevel gear 74 to rotate. Through the meshing transmission between the second bevel gear 74 and the four first bevel gears 73, the four sets of first bevel gears 73 and the corresponding screws 71 are driven to rotate synchronously. During the rotation of the screws 71, the push column 72 is driven to slide in the adjustment groove 6 on the diagonal of the mounting plate 3. The push column 72 drives the corresponding connected mounting frame 5 to move in position. The two adjacent sets of mounting frames 5 are connected by a horizontal slide bar to achieve a concave-convex fit limiting sliding connection, so that the four sets of mounting frames 5 can be adjusted in position synchronously and smoothly, thereby adapting to the clamping and positioning requirements of frames of different sizes and improving the size adaptability and versatility of the device.

[0039] Based on the above, during the adjustment of the positions of the four sets of mounting brackets 5, the two sets of push rods 72 on the left side will simultaneously abut against and squeeze the hydraulic push rod 8. After being compressed, the hydraulic push rod 8 pushes the hydraulic oil inside the hydraulic tank 9, so that the hydraulic oil is delivered to the hydraulic tank 11. This drives the hydraulic push rod 12 of the hydraulic tank 11 to adjust its position accordingly. The hydraulic push rod 12 will push the counterweight 13 to slide and adjust its position on the swing arm 10. The counterweight 13 slides along the swing arm 10, changing its center of gravity position on the swing arm 10, so that the counterweight 13 moves to the swing arm 10. The linear distance from the center of rotation is adjusted accordingly to adjust the magnitude of the rotational torque generated by the counterweight. When the drive box drives the rotating frame 2 to tilt back and forth, the center of gravity of the counterweight block 13 moves, the lever arm length is adjusted, and the swing arm 10 is tilted under force, causing the protrusion 14 on the swing arm 10 to abut against the corresponding protrusion 2 153. Since the protrusion 2 153 is connected to the hydraulic push rod 3 152, the pressure on the protrusion 2 153 will push the hydraulic oil inside the hydraulic tank 3 151, delivering the hydraulic oil to each hydraulic tank 4 154 on the mounting frame 5. The hydraulic oil in the pushed hydraulic tank 3 151 is input into the hydraulic tank 4 154 through hoses, distributors, and electronic control valves. The hose channels connecting the hydraulic tanks 3 151 and 4 154 that are not pushed or abutted are closed by electronic control valves to prevent the hydraulic oil from being diverted and pushed. In the oil tank 3 151, which is not pushed or squeezed, the oil push rod 4 155 of the oil tank 4 154 automatically adjusts its position according to the oil pressure change, pushing the spring to retract accordingly, and moving the moving plate 18 through the spring. When there is a gap at the skeleton clamping point, the moving plate 18 extends from the opening on the surface of the abutment 17, and works with the abutment 17 and the clamping plate 16 to further tighten the skeleton, fill the clamping gap, and increase the clamping force. When there is no clamping gap, the spring elastic connection structure between the moving plate 18 and the oil push rod 4 155 allows the moving plate 18 to adapt to elastic adjustment and will not extend, avoiding excessive compression of the skeleton. During the entire process of adjusting the angle of the rotating frame 2, the clamping force is adjusted accordingly, improving the clamping stability of the abutment 17 and the clamping plate 16 on the skeleton, and preventing the skeleton from loosening during the welding process.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A precision clamping and positioning device for welding metal parts for forklifts, comprising a frame (1), characterized in that: The frame (1) has a rotating frame (2) rotatably connected to the drive box on both sides. A hydraulic push rod (4) is installed in the groove of the convex seat of the rotating frame (2). The output end of the hydraulic push rod (4) is connected to a mounting plate (3). Multiple adjustment slots (6) are equidistantly opened in the circular groove at the top of the mounting plate (3). Each adjustment slot (6) is connected to a mounting bracket (5) through an adjustment component. An oil tank (9) is fixedly installed on the left side of the mounting plate (3). An oil push rod (8) is elastically and slidably installed in the inner cavity of the oil tank (9). Each mounting bracket (5) has a clamping plate (16) slidably connected to the upper and lower two transverse convex rod grooves on one side through a rotating screw (51). Each clamping plate (16) A stop block (17) is slidably connected to the sliding hole via an electric push rod. A movable plate (18) is slidably installed in the hole on the opposite side of the protrusion on the stop block (17) and the clamp plate (16). A swing rod (10) is rotatably connected in the cavity of the rotating frame (2). An oil tank (11) is installed in the groove of the swing rod (10). An oil push rod (12) is slidably installed in the sealed cavity of the oil tank (11). A counterweight (13) is abutted to the output end of the oil push rod (12). The counterweight (13) is slidably installed on the outside of the swing rod (10). A protrusion (14) is threaded to the right side of the swing rod (10). An oil adjustment component is provided between the protrusion (14) and each stop block (17).

2. The forklift metal parts welding precision clamping and positioning device according to claim 1, characterized in that: The hydraulic push rod (4) is connected to an external hydraulic drive source through a hose, and the bottom of the mounting plate (3) slides vertically through a convex rod and a circular sliding hole of the convex seat of the rotating frame (2).

3. The forklift metal parts welding precision clamping and positioning device according to claim 1, characterized in that: The positions of the multiple adjustment slots (6) correspond to the diagonal positions of the four corners of the mounting plate (3), and the four corner positions of the four mounting brackets (5) correspond to the diagonal positions of the four corners of the mounting plate (3).

4. The forklift metal parts welding precision clamping and positioning device according to claim 1, characterized in that: The four mounting brackets (5) are connected to each other by a horizontal sliding rod. The mounting bracket (5) and the groove on the surface of the horizontal sliding rod are connected by a concave-convex sliding limit. Each mounting bracket (5) is provided with a square plate on the top. The square plate on the top of the mounting bracket (5) is used for the installation of the relevant welding fixtures on the top.

5. The precision clamping and positioning device for welding metal parts of forklifts according to claim 1, characterized in that: The adjustment assembly includes four screws (71), all of which are rotatably installed in the adjustment groove (6). Each of the four screws (71) is threaded with a push post (72) on its outer side. The push post (72) is slidably installed in the adjustment groove (6). Each of the four screws (71) has a bevel tooth (73) installed on its outer side at one end. A bevel tooth (74) is engaged below the bevel tooth (73). The bevel tooth (74) is fixed to the bottom of the mounting plate (3) by a motor.

6. The forklift metal parts welding precision clamping and positioning device according to claim 5, characterized in that: The upper notch of each push post (72) is fixedly connected to the inner side of the vertical rod of the mounting bracket (5) at the corresponding position. The number of the first bevel tooth (73) and the second screw (71) corresponds to the number of the adjustment groove (6). All four sets of the first bevel tooth (73) mesh with the second bevel tooth (74).

7. The precision clamping and positioning device for welding metal parts of a forklift according to claim 5, characterized in that: The two sets of push rods (72) on the far left abut against the horizontal plate at the output end of the first oil push rod (8), and the inner cavity of the first oil tank (9) is connected to the inner cavity of the second oil tank (11) through a hose.

8. The forklift metal parts welding precision clamping and positioning device according to claim 1, characterized in that: The oil regulating assembly includes two symmetrical oil tanks (151) fixed in the cavity of the rotating frame (2). Each oil tank (151) is slidably connected to an oil push rod (152) by a spring seal. The two symmetrical oil push rods (152) are connected to a protrusion (153) at one end inward. The two symmetrical protrusions (153) are in contact with a protrusion (14) at one end inward.

9. A precision clamping and positioning device for welding metal parts for forklifts according to claim 8, characterized in that: The oil regulating assembly also includes an oil tank four (154) that runs through the other side of each abutment block (17). Each oil tank four (154) is sealed and slidably installed with an oil push rod four (155). The sliding end of the oil push rod four (155) in the abutment block (17) is connected to the moving plate (18) by a spring. The inner cavity of each oil tank three (151) is connected to the inner cavity of each oil tank four (154) through a distributor, a hose and an electrically controlled valve.

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