Manufacturing method of frame chassis assembly of forward moving type forklift truck

Abstract

The invention provides a manufacturing method of a frame chassis assembly of a reach truck. The manufacturing method comprises the following steps: S1, assembling a left supporting leg and a right supporting leg: assembling left supporting leg channel steel, a left supporting leg reinforcing plate and a left supporting leg rectangular pipe into the left supporting leg; right supporting leg channel steel, a right supporting leg reinforcing plate and a right supporting leg rectangular pipe are assembled into a right supporting leg; s2, welding a left supporting leg and a right supporting leg: welding left supporting leg channel steel, a left supporting leg reinforcing plate and a left supporting leg rectangular pipe; right supporting leg channel steel, a right supporting leg reinforcing plate and a right supporting leg rectangular pipe are welded; s3, left and right supporting legs are machined, specifically, U-shaped openings of the left supporting leg channel steel and the right supporting leg channel steel are machined; step S4, assembling the frame chassis assembly; s5, welding the frame chassis assembly; and S6, the frame chassis assembly is machined. The manufacturing precision and the production efficiency can be improved, and the production cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of forklift parts manufacturing, and in particular relates to a method for manufacturing a forward-reaching forklift frame chassis assembly. Background Art

[0002] Reach trucks have the characteristics of small turning radius and high lifting height, and they play a very important role in warehousing and logistics. Due to the high lifting height of reach trucks, higher requirements are placed on the manufacturing precision of the frame and chassis while ensuring the stability of the vehicle.

[0003] The existing method for manufacturing the frame chassis assembly of a reach forklift is as follows: first, the left and right legs are processed, assembled and welded, and the drive mounting seat is assembled, welded, corrected and processed simultaneously; then, the left and right legs, the drive mounting seat, the left and right guard plates and the frame bottom plate are assembled into the frame chassis, and then welded, and then the front wheel axle mounting hole and the brake mounting surface are processed on the frame chassis; finally, the frame chassis and the left and right front wheel support plates are assembled and welded into the frame chassis assembly.

[0004] In the above manufacturing method, since the left leg and the right leg are first processed and then welded, the deformation caused by welding will cause the flatness of the track surface on the left leg channel steel and the right leg channel steel to be unable to be guaranteed, resulting in poor stability when the forklift moves forward and backward. Therefore, how to design a manufacturing method for a forward-reaching forklift frame chassis assembly to better ensure the flatness of the track surface on the left leg channel steel and the right leg channel steel has become a technical problem that technicians in this field urgently need to solve. Summary of the invention

[0005] The object of the present invention is to provide a method for manufacturing a reach-type forklift frame chassis assembly to solve the above-mentioned technical problems in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A method for manufacturing a reach forklift frame chassis assembly comprises the following steps:

[0008] Step S1, pairing the left and right legs:

[0009] Assemble the left leg channel steel, the left leg reinforcement plate and the left leg rectangular tube to form the left leg;

[0010] Assemble the right leg channel steel, the right leg reinforcement plate and the right leg rectangular tube to form the right leg;

[0011] Step S2: Welding of left and right legs:

[0012] Weld the left leg channel steel, the left leg reinforcement plate and the left leg rectangular tube;

[0013] Weld the right leg channel steel, the right leg reinforcement plate and the right leg rectangular tube;

[0014] Step S3: Left and right leg processing:

[0015] Process the U-shaped openings of the left and right leg channel steels;

[0016] Step S4, assembling the frame and chassis assembly;

[0017] Step S5, welding the frame chassis assembly;

[0018] Step S6: Processing the frame and chassis assembly.

[0019] Preferably, the specific content of the frame chassis assembly pairing in step S4 is: pairing the drive mounting plate, the supporting curved beam, the left guard plate, the right guard plate, the right front wheel support plate, the left front wheel support plate, the frame bottom plate and the left support leg and the right support leg into a frame chassis assembly.

[0020] Preferably, the specific contents of the welding of the frame chassis assembly in step S5 are: welding the drive mounting plate, the supporting curved beam, the left guard plate, the right guard plate, the right front wheel support plate, the left front wheel support plate, the frame bottom plate and the left and right legs.

[0021] Preferably, the specific content of the frame chassis assembly processing in step S6 is: processing the drive mounting surface, the front wheel axle mounting hole and the brake mounting surface on the frame chassis assembly.

[0022] Preferably, during the assembly of the frame chassis, a certain anti-deformation margin is set for the gap size between the front end of the left leg channel steel and the front end of the right leg channel steel.

[0023] Preferably, the certain anti-deformation margin is 1.5 mm to 2.5 mm.

[0024] Preferably, after the frame chassis assembly is assembled, a tie rod is welded between the front end of the left leg channel steel and the front end of the right leg channel steel; before the frame chassis assembly is processed, the tie rod is removed.

[0025] Preferably, the machining of the frame chassis assembly is performed on a five-axis gantry machining center.

[0026] Preferably, when processing the frame chassis assembly, the track surfaces on the left and right legs are used as horizontal positioning references to process the drive mounting surface, the front wheel axle mounting hole and the brake mounting surface respectively.

[0027] Preferably, the welding of the frame chassis assembly is performed on a robot welding workstation.

[0028] The beneficial effects of the present invention are:

[0029] The manufacturing method of the forward-reaching forklift frame chassis assembly of the present invention is to assemble and weld the left leg and the right leg and then perform processing. Since the processing step is performed after the welding step, it is possible to effectively avoid the influence of deformation caused by welding on the processing, thereby better ensuring the flatness of the track surface processed at the U-shaped opening of the left leg channel steel and the right leg channel steel, thereby making the forklift more stable when moving. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the embodiments, and further describe the specific embodiments of the present invention in detail in conjunction with the drawings, wherein

[0031] Figure 1 A flow chart of a method for manufacturing a reach forklift frame chassis assembly provided by an embodiment of the present invention;

[0032] Figure 2 A schematic diagram of a left leg provided in an embodiment of the present invention;

[0033] Figure 3 A schematic diagram of a right leg provided in an embodiment of the present invention;

[0034] Figure 4 A schematic diagram of a drive mounting base provided in an embodiment of the present invention;

[0035] Figure 5 A schematic diagram of a frame chassis provided by an embodiment of the present invention;

[0036] Figure 6 A schematic diagram of a frame chassis assembly provided in an embodiment of the present invention.

[0037] Markings in the accompanying drawings:

[0038] 1. Left outrigger, 11. Left outrigger channel steel, 12. Left outrigger reinforcement plate,

[0039] 13. Left leg rectangular tube; 2. Left guard plate; 3. Drive mounting seat,

[0040] 31. drive mounting plate, 32. support bending beam; 4. right guard plate;

[0041] 5. Right outrigger, 51. Right outrigger channel steel, 52. Right outrigger rectangular tube,

[0042] 53. Right outrigger reinforcement plate; 6. Right front wheel support plate; 7. Frame bottom plate;

[0043] 8. Left front wheel support plate. DETAILED DESCRIPTION

[0044] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention unless otherwise specifically stated.

[0045] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0046] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0047] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0048] like Figures 1 to 6 As shown, an embodiment of the present invention provides a method for manufacturing a reach forklift frame chassis assembly, which includes the following steps:

[0049] Step S1, pairing the left and right legs:

[0050] Assemble the left leg channel steel 11, the left leg reinforcement plate 12 and the left leg rectangular tube 13 into the left leg 1;

[0051] Assemble the right leg channel steel 51, the right leg reinforcement plate 53 and the right leg rectangular tube 52 to form the right leg 5;

[0052] Step S2: Welding of left and right legs:

[0053] Weld the left leg channel steel 11, the left leg reinforcement plate 12 and the left leg rectangular tube 13;

[0054] Weld the right leg channel steel 51, the right leg reinforcement plate 53 and the right leg rectangular tube 52;

[0055] Step S3: Left and right leg processing:

[0056] Process the U-shaped openings of the left leg channel steel 11 and the right leg channel steel 51;

[0057] Step S4, assembling the frame and chassis assembly;

[0058] Step S5, welding the frame chassis assembly;

[0059] Step S6: Processing the frame and chassis assembly.

[0060] The manufacturing method of the reach-type forklift frame chassis assembly provided in the embodiment of the present invention is to assemble and weld the left leg 1 and the right leg 5 and then perform processing. Since the processing step is performed after the welding step, this can effectively avoid the influence of deformation caused by welding on the processing, thereby better ensuring the flatness of the track surface processed at the U-shaped opening of the left leg channel steel 11 and the right leg channel steel 51, thereby making the forklift more stable when moving.

[0061] Specifically, the left leg 1 and the right leg 5 can be welded manually, and the welds are intermittently welded to reduce the welding deformation of the two legs; when welding, the spot welding is firm, and the spot welding position is selected at the starting point or end point of the weld to avoid affecting the weld forming quality during welding. When processing the left leg and the right leg, they can be processed simultaneously on a vertical machining center to improve processing efficiency.

[0062] Furthermore, the specific content of the frame chassis assembly pairing in step S4 is: the drive mounting plate 31, the supporting curved beam 32, the left guard plate 2, the right guard plate 4, the right front wheel support plate 6, the left front wheel support plate 8, the frame bottom plate 7 and the left support leg 1 and the right support leg 5 are paired into the frame chassis assembly.

[0063] Specifically, during the assembly of the frame chassis, a certain anti-deformation margin is set for the opening size between the front end of the left leg channel steel 11 and the front end of the right leg channel steel 51. The certain anti-deformation margin can be 1.5 mm to 2.5 mm, preferably 2 mm, so as to offset the welding deformation caused by the subsequent welding process to a certain extent, and better avoid the problem of the opening size being too large due to the welding deformation caused by the subsequent welding process.

[0064] Preferably, after the frame chassis assembly is assembled and before demoulding, a tie rod can be spot welded between the front end of the left leg channel steel 11 and the front end of the right leg channel steel 51. With this solution, the tie rod is used to realize the connection between the front end of the left leg channel steel and the front end of the right leg channel steel, which can not only reduce the change of the above-mentioned opening size during the demoulding and transportation of the frame chassis assembly, but also can better eliminate most of the deformation of the front end opening of the left leg channel steel and the right leg channel steel during the welding process. Before the frame chassis assembly is processed, the tie rod is removed to release the residual stress. The frame chassis assembly can be assembled using a special assembly tool, which can locate and clamp the key dimensions of each component, and better ensure the assembly accuracy.

[0065] Furthermore, the specific contents of the welding of the frame chassis assembly in step S5 are: welding the drive mounting plate 31, the support curved beam 32, the left guard plate 2, the right guard plate 4, the right front wheel support plate 6, the left front wheel support plate 8, the frame bottom plate 7, and the left leg 1 and the right leg 5. At this time, a special welding fixture can be used to set positioning and rigid clamping for the left leg 1 and the right leg 5, which are very prone to welding deformation, so as to reduce welding deformation and ensure the dimensional accuracy of the track surface on the left leg 1 and the right leg 5.

[0066] Specifically, the specific content of the frame chassis assembly processing in step S6 is: processing the drive mounting surface, the front wheel axle mounting hole and the brake mounting surface on the frame chassis assembly.

[0067] Furthermore, the processing of the frame chassis assembly is carried out on a five-axis gantry machining center equipped with a special positioning fixture. When processing the frame chassis assembly, the track surface on the left leg 1 and the right leg 5 is used as the horizontal positioning reference, and the drive mounting surface, the front wheel axle mounting hole and the brake mounting surface are processed respectively.

[0068] Specifically, the welding of the frame chassis assembly is performed on a robotic welding workstation, thereby ensuring the consistency of the welds.

[0069] Compared with the existing forklift frame chassis assembly manufacturing method, the manufacturing method of the reach forklift frame chassis assembly provided by the embodiment of the present invention has the following advantages:

[0070] 1. High manufacturing precision:

[0071] The left and right legs are welded before processing instead of processed first, which improves the flatness of the track surface on the left and right legs.

[0072] The drive mounting seat composed of the drive mounting plate and the support curved beam is assembled, welded, corrected and processed in the form of a small assembly, but the small assembly is omitted, and the drive mounting plate and the support curved beam are directly welded on the frame chassis assembly and then processed, thereby improving the dimensional accuracy of the front wheel mounting shaft hole and the drive mounting surface; at the same time, because the frame chassis assembly is first welded and then processed, the dimensional error caused by welding deformation can be better avoided, and the drive mounting surface is guaranteed to be parallel to the track surface on the left and right legs; and the correction process of the existing drive mounting seat is omitted;

[0073] The left and right front wheel brackets are welded together with the frame chassis to form a frame chassis assembly instead of machining the front wheel axle mounting holes separately first. This is to better avoid the dimensional error caused by welding deformation, improve the coaxiality of the left and right front wheel axle mounting holes, and ensure that the front wheel axle can be installed smoothly.

[0074] The process of welding, processing and re-welding which is not conducive to precision control in the existing manufacturing method is reduced.

[0075] 2. Low manufacturing cost: The manufacturing process of the drive mounting seat is omitted, the number of tools, fixtures and equipment used is reduced, and the investment cost of tools, fixtures and equipment is reduced; the manufacturing method of the present invention has fewer steps, improves production efficiency, uses fewer workers, and has low labor costs.

[0076] 3. Smooth material transportation: The existing production method is to first separately produce a variety of small assemblies such as the left leg, the right leg and the drive mounting seat, and then merge them into a frame chassis, and then produce the frame chassis assembly. There are many processes, too many material transfer positions, and the logistics is not smooth. The present invention first produces a small assembly such as the left and right legs, and then directly transfers them to the frame chassis assembly station. There are fewer material transfer points, a shorter transfer distance, smoother logistics, and improved production efficiency. At the same time, it is convenient for the one-line layout of the later automated production line.

[0077] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A method for manufacturing a reach forklift frame chassis assembly, characterized in that: It includes the following steps: Step S1, pairing the left and right legs: Assemble the left leg channel steel, the left leg reinforcement plate and the left leg rectangular tube to form the left leg; Assemble the right leg channel steel, the right leg reinforcement plate and the right leg rectangular tube to form the right leg; Step S2: Welding of left and right legs: Weld the left leg channel steel, the left leg reinforcement plate and the left leg rectangular tube; Weld the right leg channel steel, the right leg reinforcement plate and the right leg rectangular tube; Step S3: Left and right leg processing: Process the U-shaped openings of the left and right leg channel steels; Step S4, assembling the frame and chassis assembly; Step S5, welding the frame chassis assembly; Step S6: Processing the frame and chassis assembly.

2. The method for manufacturing a reach forklift chassis assembly according to claim 1, characterized in that: The specific content of the frame chassis assembly pairing in step S4 is: pairing the drive mounting plate, the support curved beam, the left guard plate, the right guard plate, the right front wheel support plate, the left front wheel support plate, the frame bottom plate and the left support leg and the right support leg into the frame chassis assembly.

3. The method for manufacturing a reach forklift chassis assembly according to claim 2, characterized in that: The specific contents of the welding of the frame chassis assembly in step S5 are: welding the drive mounting plate, the support curved beam, the left guard plate, the right guard plate, the right front wheel support plate, the left front wheel support plate, the frame bottom plate, and the left and right legs.

4. The method for manufacturing a reach forklift chassis assembly according to claim 3, characterized in that: The specific content of the frame chassis assembly processing in step S6 is: processing the drive mounting surface, the front wheel axle mounting hole and the brake mounting surface on the frame chassis assembly.

5. The method for manufacturing a reach forklift chassis assembly according to claim 4, characterized in that: During the assembly of the frame chassis, a certain anti-deformation margin is set for the opening size between the front end of the left leg channel steel and the front end of the right leg channel steel.

6. The method for manufacturing a reach forklift chassis assembly according to claim 5, characterized in that: The certain anti-deformation margin is 1.5 mm to 2.5 mm.

7. The method for manufacturing a reach forklift chassis assembly according to claim 5, characterized in that: After the frame chassis assembly is assembled, a tie rod is welded between the front end of the left leg channel steel and the front end of the right leg channel steel; before the frame chassis assembly is processed, the tie rod is removed.

8. The method for manufacturing a reach forklift chassis assembly according to claim 4, characterized in that: The machining of the frame chassis assembly is carried out on a five-axis gantry machining center.

9. The method for manufacturing a reach forklift chassis assembly according to claim 8, characterized in that: When machining the frame chassis assembly, the track surfaces on the left and right legs are used as horizontal positioning references to machine the drive mounting surface, the front wheel axle mounting hole and the brake mounting surface respectively.

10. The method for manufacturing a reach forklift frame chassis assembly according to any one of claims 1 to 9, characterized in that: The welding of the frame chassis assembly is carried out on a robotic welding workstation.

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