A forklift truck frame support plate tailor-welded positioning and tensioning device

Abstract

This utility model discloses a forklift frame support plate welding positioning and tensioning device, including a base assembly, a positioning shaft mechanism for positioning the support plate on the base assembly, a pneumatic drive device in the middle of the base assembly for reciprocating rotation of the positioning shaft mechanism, and two tensioning devices on the positioning shaft mechanism for positioning and tensioning the support plate. Under the action of the pneumatic drive device's slide cylinder, this utility model pushes the positioning shaft mechanism to perform a 180-degree reciprocating rotation, creating two working positions: positioning and demolding. While ensuring the positioning accuracy of the support plate, it solves the demolding problem after frame welding and significantly improves frame welding efficiency and worker survival rate.

Description

Technical Field

[0001] This utility model relates to a welding, positioning, and tensioning device for a forklift frame support plate, belonging to the field of forklift technology. Background Technology

[0002] The forklift frame support plate is a crucial load-bearing component connecting the forklift's fuel tank and drive axle, consisting of two plates, one on each side. Its front end has a semi-circular hole for bolt assembly to the drive axle's axle groove, while its rear end is welded to the frame's fuel tank. Therefore, the welding positioning accuracy of the support plate on the frame is critical; ensuring the coaxiality of the semi-circular holes in both support plates is essential for the forklift's normal movement.

[0003] In the industry, there are two commonly used welding and positioning devices for forklift frame support plates:

[0004] The first method is to use a fixed shaft positioning method. The semi-circular hole at the front end of the support plate is engaged with the fixed shaft and then tightened to accurately position the support plate. After the frame is welded, the lifting tool first drags the frame backward so that the semi-circular hole of the support plate is dislodged from the fixed shaft. Then the frame is lifted vertically to achieve the purpose of demolding the frame from the frame welding fixture.

[0005] The second method is to fix the fixed shaft on the fixed seat, move the fixed shaft seat back and forth as a whole, move the fixed shaft seat towards the near semi-circular hole during positioning, and move the positioning shaft seat towards the far semi-circular hole before demolding.

[0006] However, with the development of forklift frame structures and the requirement that a set of frame welding fixtures can adapt to the welding of multiple frames, the structure limits the lifting tool from dragging the frame backward. The first fixed shaft positioning method can no longer achieve normal demolding of the frame from the welding fixture. The second fixed shaft seat moving method requires precise control of the moving distance, and the cost of using PLC control is high. Using pin or thread rotation method requires manual control and has great limitations.

[0007] Therefore, how to design a semi-circular hole positioning method that is suitable for welding various vehicle frames while also facilitating production and reducing investment costs has become a research topic for technical personnel in this industry. Summary of the Invention

[0008] The technical problem to be solved by this utility model is: how to facilitate the demolding of the support plate after it is welded by the fixed shaft positioning method, and how to improve the demolding efficiency of the support plate.

[0009] To solve the above-mentioned technical problems, the technical solution of this utility model is to provide a forklift frame support plate welding positioning and tensioning device, characterized in that it includes a base assembly, a positioning shaft mechanism for positioning the support plate is provided on the base assembly, a pneumatic drive device for pushing the positioning shaft mechanism to reciprocate and rotate is provided in the middle of the base assembly, and two tensioning devices for positioning and tensioning the support plate are provided on the positioning shaft mechanism.

[0010] Preferably, the base assembly has through holes on both sides, and the two ends of the positioning shaft mechanism are respectively rotatably disposed in the through holes at both ends of the base assembly.

[0011] Preferably, the pneumatic drive device is located in the middle of the base assembly, driving the positioning shaft mechanism to perform a 180-degree reciprocating rotation.

[0012] Preferably, the base assembly includes a support weld and end caps. The support weld has semi-circular holes on both sides of its top. An end cap is connected to the top of both sides of the support weld, and each end cap also has a semi-circular hole. The support weld and the end caps are connected to form a through hole in the base assembly. A pneumatic drive device is connected to the middle of the support weld.

[0013] Preferably, the base assembly further includes a positioning sleeve, and each through hole of the base assembly is provided with a positioning sleeve for positioning and adjusting the positioning shaft mechanism. Each positioning sleeve is coaxially fitted with the through hole and is located on the end face of the through hole.

[0014] Preferably, the positioning shaft mechanism includes a shaft body, a driven gear coaxially fixedly connected to the shaft body, rolling bearings located near both ends of the shaft body, the rolling bearings being located in the through holes of the base assembly, and semi-circular positioning sleeves located at both ends of the shaft body, with annular grooves opened on the semi-circular positioning sleeves, and support plates being engaged in the annular grooves.

[0015] Preferably, the positioning shaft mechanism further includes a pin, and the shaft body is provided with a pair of vertically distributed holes, the pin being detachably inserted into the holes on the shaft body.

[0016] Preferably, the semi-circular positioning sleeve is a solid with more than half of the annular groove removed; when the semi-circular positioning sleeve rotates 180 degrees, the positioning shaft mechanism is in the positioning working state or the demolding working state.

[0017] Preferably, the pneumatic drive device includes a slide cylinder that is controlled by an air valve to make forward and backward linear motion. The top of the slide cylinder is connected to the active rack through a connecting plate, and the active rack meshes with the passive gear.

[0018] Preferably, the tensioning device includes a pressure plate and a tensioning screw. The two ends of the pressure plate are respectively provided with threaded holes or through holes, and a tensioning screw is inserted into each threaded hole or through hole. During positioning, the pressure plate is locked in the groove of the semi-circular positioning sleeve, and the tensioning screw passes through the threaded hole of the pressure plate and cooperates with the threaded hole on the end face of the support plate, so that the support plate is tightly attached to the groove of the semi-circular positioning sleeve.

[0019] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0020] This invention proposes a positioning and tensioning device for a forklift frame support plate, featuring a semi-circular positioning sleeve and a rotatable positioning shaft mechanism. Driven by a pneumatically operated slide cylinder, the positioning shaft mechanism rotates 180 degrees, creating two working positions: positioning and demolding. During frame welding, the positioning shaft mechanism is in the positioning position, holding the support plate within the semi-circular positioning sleeve groove. The tensioning device accurately positions and presses the support plate. After frame welding, the tensioning device is released, the air valve is opened, and the pneumatically operated device rotates the positioning shaft mechanism to the demolding position. At this point, the semi-circular positioning sleeve rotates out of the support plate hole, creating space for the frame to be lifted vertically for demolding. This device ensures the positioning accuracy of the support plate while solving the demolding problem after frame welding, significantly improving frame welding efficiency and worker survival rate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the positioning state of a forklift frame support plate welding positioning and tensioning device.

[0022] Figure 2 This is a schematic diagram of the structure of a forklift frame support plate welding positioning and tensioning device in the demolding state;

[0023] Figure 3 This is a structural diagram of the base assembly;

[0024] Figure 4 This is a schematic diagram of the positioning shaft mechanism;

[0025] Figure 5 This is a schematic diagram of the pneumatic drive device.

[0026] Figure 6 This is a schematic diagram of the tensioning device.

[0027] The components are: 1. Base assembly, 2. Positioning shaft mechanism, 3. Pneumatic drive device, 4. Tensioning device, 5. Support welding, 6. End cover, 7. Positioning sleeve, 8. Shaft, 9. Driven gear, 10. Rolling bearing, 11. Semi-circular positioning sleeve, 12. Orientation key, 13. Set screw, 14. Pin, 15. Slide cylinder, 16. Connecting plate, 17. Drive rack, 18. Detection device, 19. Pressure plate, 20. Tensioning screw. Detailed Implementation

[0028] To make this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0029] This utility model discloses a forklift frame support plate welding positioning and tensioning device, such as Figure 1 , Figure 2 As shown, it includes a base assembly 1, a positioning shaft mechanism 2 with a positioning support plate on the base assembly 1, a pneumatic drive device 3 in the middle of the base assembly 1 to drive the positioning shaft mechanism 2 to reciprocate and rotate, and two tensioning devices 4 on the positioning shaft mechanism 2 to position and tighten the support plate.

[0030] The base assembly 1 has through holes on both sides, which are machined to support the positioning shaft mechanism 2, ensuring equal height and coaxiality. The two ends of the positioning shaft mechanism 2 are rotatably positioned within the through holes on both sides of the base assembly 1, and the positioning shaft mechanism 2 can rotate around the center line of the through holes. A pneumatic drive device 3 is installed in the middle of the base assembly 1, driving the positioning shaft mechanism 2 to perform a 180-degree reciprocating rotation. A tensioning device 4 is installed on the positioning shaft mechanism 2, is detachable, and is used to tighten during positioning and remove during demolding.

[0031] like Figure 3 As shown, the base assembly 1 includes a support weld 5, end caps 6, and positioning sleeves 7. The support weld 5 is a structural welded component. A set of semi-circular holes are provided on both sides of the top of the support weld 5. An end cap 6 is connected to the top of each side of the support weld 5, and each end cap 6 also has a semi-circular hole. After assembly, the support weld 5 and end caps 6 form a complete set of through holes for supporting the positioning shaft mechanism 2, ensuring the positioning shaft mechanism 2 is level and coaxial. A positioning sleeve 7 is also provided in each through hole of the base assembly 1 to position and adjust the positioning shaft mechanism 2. Each positioning sleeve 7 is coaxially fitted with the through hole end face, restricting the axial movement of the positioning shaft mechanism 2 and ensuring the centering of the positioning shaft mechanism 2. The support weld 5 has a flat surface and connecting holes machined in the middle for accurate assembly of the pneumatic drive device 3. In this embodiment, the positioning sleeve 7 has a semi-circular structure.

[0032] like Figure 4As shown, the positioning shaft mechanism 2 includes a shaft 8, a driven gear 9, rolling bearings 10, semi-circular positioning sleeves 11, a directional key 12, a set screw 13, and a pin 14. The driven gear 9 and shaft 8 are assembled as a single unit, driving the entire positioning shaft mechanism 2 to rotate. Two rolling bearings 10 are respectively located on the shaft 8 near both ends, serving to accurately position and support the rotation of the positioning shaft mechanism 2. Simultaneously, the rolling bearings 10 are mounted in the through holes of the base assembly 1, and through the inner and outer rings and the positioning sleeves 7, they also serve to position the axial movement of the positioning shaft mechanism 2. Two semi-circular positioning sleeves 11 are respectively mounted at both ends of the shaft 8. The semi-circular positioning sleeves 11 are directional and used for positioning the support plate. The semi-circular positioning sleeves 11, together with the directional key 12 and the set screw 13, ensure the correct position and orientation of the semi-circular positioning sleeves 11 and transmit rotational motion. The semi-circular positioning sleeves 11 have annular grooves, and the support plate is locked within these grooves to achieve positioning of the support plate. More than half of the solid portion of the annular groove of the semi-circular positioning sleeve 11 is removed. After the semi-circular positioning sleeve 11 rotates 180 degrees, it can achieve two working states: positioning and demolding of the positioning shaft mechanism 2. The positioning shaft mechanism 2 also includes a pin 14 and a pair of vertically distributed holes on the shaft body 8 for manual rotation operation of the positioning shaft mechanism 2. In this embodiment, the driven gear 9 is located in the middle of the shaft body 8.

[0033] like Figure 5 As shown, the pneumatic drive device 3 includes a slide cylinder 15, a connecting plate 16, a drive rack 17, and a detection device 18. The slide cylinder 15 is the power element of the pneumatic drive device 3, and its forward and backward linear motion can be controlled by a valve (i.e.,...). Figure 1 The direction is perpendicular to the shaft 8 (but not vertical). The active rack 17 is mounted on the slide cylinder 15 (top) via the connecting plate 16. When the slide cylinder 15 moves forward and backward in a linear motion, it drives the active rack 17 to also move in a linear motion. The active rack 17 meshes with the driven gear 9, driving the positioning shaft mechanism 2 to rotate. A detection device 18 is also provided on the side of the slide cylinder 15. The detection device 18 includes a magnetic switch that detects and controls the stroke of the cylinder. By adjusting the position of the magnetic switch, the forward and backward position and stroke of the slide cylinder 15 are controlled.

[0034] like Figure 6 As shown, the tensioning device 4 includes a pressure plate 19 and two tensioning screws 20 that press the support plate against the positioning shaft mechanism 2. These are arranged near the semi-circular positioning sleeve 11. The pressure plate 19 has threaded holes or through holes at both ends, and a tensioning screw 20 passes through each threaded hole or through hole. During positioning, the pressure plate 19 is engaged in the groove of the semi-circular positioning sleeve 11. The tensioning screws 20, through the threaded holes (or through holes) of the pressure plate 19, engage with the threaded holes on the end face of the support plate, pressing the support plate tightly against the annular groove of the semi-circular positioning sleeve 11, thus tensioning and positioning the support plate.

[0035] The working process of this utility model is as follows:

[0036] During frame welding, rotating the air valve moves the slide cylinder 15 forward, causing the positioning shaft mechanism 2 to rotate into position. The annular groove portion of the semi-circular positioning sleeve 11 is then in a protruding position. Figure 2 As shown, this is defined as the demolding state, at which point other workpieces (i.e., support plates) are placed inside the device of this invention.

[0037] After the support plate is placed, the air valve is rotated in the reverse direction, causing the slide cylinder 15 to move backward, which in turn drives the positioning shaft mechanism 2 to rotate in the reverse direction and into place. The annular groove portion of the semi-circular positioning sleeve 11 is in the convex rear position. Figure 1 As shown, this is defined as the positioning state. At this time, the support plate is tightly pressed against the annular groove of the semi-circular positioning sleeve 11 by the pressure plate 19 and the tension screw 20.

[0038] After spot welding is completed, loosen the tension screw 20, remove the tensioning device 4, and rotate the air valve in the opposite direction again. The positioning shaft mechanism 2 then enters the demolding state again. At this time, the semi-circular positioning sleeve 11 comes out of the support plate hole, making room for the frame to be lifted out of the mold vertically. After the previous frame is demolded, the forklift frame support plate welding positioning tensioning device directly enters the welding process of the next frame, and so on.

Claims

1. A forklift truck frame support plate tailor-welded positioning and tensioning device, characterized in that, It includes a base assembly (1), a positioning shaft mechanism (2) with a positioning support plate on the base assembly (1), a pneumatic drive device (3) in the middle of the base assembly (1) to drive the positioning shaft mechanism (2) to reciprocate and rotate, and two tensioning devices (4) on the positioning shaft mechanism (2) to position and tighten the support plate.

2. A pin type boom carriage frame support plate tailor-welded blank positioning and tensioning device as claimed in claim 1, characterized in that, The base assembly (1) has through holes on both sides, and the two ends of the positioning shaft mechanism (2) are respectively rotatably disposed in the through holes at both ends of the base assembly (1).

3. A pin type boom carriage frame support plate tailor-welded blank positioning and tensioning device as claimed in claim 1, wherein, The pneumatic drive device (3) is located in the middle of the base assembly (1) and drives the positioning shaft mechanism (2) to perform a 180-degree reciprocating rotation.

4. A pin-on frame support plate tack weld positioning and tensioning device as claimed in claim 1 wherein, The base assembly (1) includes a support weld (5) and an end cap (6). The support weld (5) has semi-circular holes on both sides of its top. An end cap (6) is connected to the top of both sides of the support weld (5). Each end cap (6) also has a semi-circular hole. The support weld (5) and the end cap (6) are connected to form a through hole in the base assembly (1). A pneumatic drive device (3) is connected to the middle of the support weld (5).

5. A pin type boom carriage frame support plate tailor-welded blank positioning and tensioning device as claimed in claim 4, wherein, The base assembly (1) further includes a positioning sleeve (7). Each through hole of the base assembly (1) is provided with a positioning sleeve (7) for positioning and adjusting the positioning shaft mechanism (2). Each positioning sleeve (7) is coaxially engaged with the through hole and is located on the end face of the through hole.

6. A pin-on frame support plate tack weld positioning and tensioning device as claimed in claim 1 wherein, The positioning shaft mechanism (2) includes a shaft (8), a driven gear (9) is coaxially fixedly connected to the shaft (8), and rolling bearings (10) are provided near both ends of the shaft (8). The rolling bearings (10) are located in the through holes of the base assembly (1). Semicircular positioning sleeves (11) are provided at both ends of the shaft (8). The semicircular positioning sleeves (11) have annular grooves, and the support plate is stuck in the annular grooves.

7. The forklift frame support plate welding positioning and tensioning device as described in claim 6, characterized in that, The positioning shaft mechanism (2) further includes a pin (14). The shaft body (8) is provided with a pair of vertically distributed holes, and the pin (14) is detachably inserted into the holes on the shaft body (8).

8. A pin-on frame support plate stitch welding positioning and tensioning device as claimed in claim 6, wherein, The semi-circular positioning sleeve (11) is a solid with more than half of the annular groove removed; when the semi-circular positioning sleeve (11) rotates 180 degrees, the positioning shaft mechanism (2) is in the positioning working state or the demolding working state.

9. A pin-on frame support plate stitch welding positioning and tensioning device as claimed in claim 6, wherein, The pneumatic drive device (3) includes a slide cylinder (15) that is controlled by an air valve to make forward and backward linear motion. The top of the slide cylinder (15) is connected to the active rack (17) through a connecting plate (16). The active rack (17) meshes with the passive gear (9).

10. The forklift frame support plate welding positioning and tensioning device as described in claim 6, characterized in that, The tensioning device (4) includes a pressure plate (19) and a tensioning screw (20). The two ends of the pressure plate (19) are respectively provided with threaded holes or through holes, and a tensioning screw (20) is inserted in each threaded hole or through hole. When positioning, the pressure plate (19) is stuck in the groove of the semi-circular positioning sleeve (11), and the tensioning screw (20) passes through the threaded hole of the pressure plate (19) and cooperates with the threaded hole on the end face of the support plate, so that the support plate is tightly attached to the annular groove of the semi-circular positioning sleeve (11).

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