CN-122007820-A - Manufacturing method of lifting frame assembly of pallet truck

Abstract

The invention relates to the technical field of forklifts, and particularly discloses a manufacturing method of a pallet truck lifting frame assembly. The manufacturing method comprises the steps of assembling left fork legs, welding, assembling right fork legs, welding, machining pin shaft mounting holes in the left fork legs and the right fork legs, assembling a frame assembly, welding, machining shaft head mounting holes in the frame assembly, assembling roller shaft heads on the frame assembly, welding again to form a shaft head frame assembly, assembling the left fork legs and the right fork legs on the shaft head frame assembly, and welding to form the lifting frame assembly. According to the invention, the pin shaft mounting holes are respectively processed after the left fork leg and the right fork leg are formed by assembly and welding, and the shaft head mounting holes are processed after the frame assembly is formed by assembly and welding, so that the dimensional deviation caused by welding deformation can be effectively eliminated, the dimensional precision of the left fork leg, the right fork leg and the roller shaft head is improved, the flow of adverse precision control caused by the first processing and the second welding is reduced, and the manufacturing precision of the lifting frame assembly is improved.

Inventors

• CHEN ZHONGHUA
• DONG YANPING
• DIAO WEI
• HE ZHICHENG

Assignees

• 安徽合力股份有限公司

Dates

Publication Date

20260512

Application Date

20260323

Claims (10)

1. 1. The manufacturing method of the lifting frame assembly of the pallet truck is characterized by comprising the following steps of: s1, assembling a left fork leg, welding, assembling a right fork leg and welding; S2, processing a pin shaft mounting hole on the left fork leg and the right fork leg; s3, assembling and welding a frame assembly, and processing a shaft head mounting hole on the frame assembly; S4, assembling the roller shaft heads on the frame assembly and then welding to form a shaft head frame assembly; S5, assembling the left fork leg and the right fork leg on the shaft head frame assembly, and welding to form the lifting frame assembly.
2. 2. The method for manufacturing a pallet jack assembly of claim 1, wherein in step S1, the left fork leg includes a left fork body, a left pin mounting plate, a left reinforcing plate, two left support plates and a left rib plate, and the assembling and welding of the left fork leg include: assembling a left pin shaft mounting plate, a left reinforcing plate and two left support plates on a left fork body, and assembling a left rib plate on the two left support plates; the left pin shaft mounting plate, the left reinforcing plate, the two left support plates and the left fork body are welded and connected, and then the left rib plate is welded and connected with the two left support plates.
3. 3. The method for manufacturing a pallet jack assembly according to claim 2, wherein in step S1, the right fork leg includes a right fork body, a right pin mounting plate, a right reinforcing plate, two right support plates and a right rib plate, and the assembling and welding of the right fork leg includes: Assembling a right pin shaft mounting plate, a right reinforcing plate and two right support plates on a right fork body, and then assembling a right rib plate on the two right support plates; the right pin shaft mounting plate, the right reinforcing plate, the two right support plates and the right fork body are welded and connected, and then the right rib plate is welded and connected with the two right support plates.
4. 4. A method of manufacturing a pallet jack assembly according to claim 2 or claim 3 wherein the welding is manual and the weld is intermittent.
5. 5. The method of claim 2, wherein in step S2, the pin mounting holes are machined in the left fork leg by using a horizontal machining center, and the pin mounting holes are machined in the left pin mounting plate and the two left support plates.
6. 6. The method of claim 3, wherein in step S2, the pin mounting holes are machined in the right fork leg by using a horizontal machining center, and the pin mounting holes are machined in the right pin mounting plate and the two right support plates.
7. 7. The method for manufacturing a pallet jack lifting frame assembly according to claim 1, wherein in step S3, the frame assembly includes an upper cross plate, a left vertical plate, a right vertical plate, two shaft head mounting plates, a front baffle plate and a lower cross plate, and the assembling and welding of the frame assembly includes: assembling an upper transverse plate, a left vertical plate, a right vertical plate, two shaft head mounting plates, a front baffle plate and a lower transverse plate to form a frame assembly; The upper transverse plate is welded with the left vertical plate, the right vertical plate and the two shaft head mounting plates, the lower transverse plate is welded with the left vertical plate, the right vertical plate and the two shaft head mounting plates, and the front baffle is welded with the left vertical plate, the right vertical plate, the two shaft head mounting plates and the lower transverse plate.
8. 8. The method of claim 7, wherein the welding is performed manually, and the weld is intermittent.
9. 9. The method of claim 7, wherein in step S3, the two shaft head mounting holes are formed in the two shaft head mounting plates by using a horizontal machining center.
10. 10. The method for manufacturing a pallet jack lifting frame assembly according to claim 9, wherein in the step S4, the number of the roller shaft heads is four, and the assembling and welding of the roller shaft heads on the frame assembly comprises the steps of inserting the four roller shaft heads into four shaft head mounting holes respectively, fixing by spot welding, and then welding.

Description

Manufacturing method of lifting frame assembly of pallet truck Technical Field The invention relates to the technical field of pallet trucks, in particular to a manufacturing method of a pallet truck lifting frame assembly. Background The pallet truck has the advantages of high transportation efficiency, reduced transportation labor intensity, compact body, capability of operating in a narrow space and the like, becomes an essential device in modern logistics and manufacturing industries, and plays a key role in improving operation efficiency and reducing cost for enterprises. The lifting frame of the pallet truck is a vehicle type carrying bearing key component, and the manufacturing precision of the lifting frame is important to the running performance of the whole vehicle, carrying bearing strength and driving feeling. The current manufacturing method of the lifting frame assembly of the pallet truck is shown in fig. 1, and comprises the steps of firstly processing parts, assembling, welding left and right fork legs, synchronously assembling, welding and correcting lifting frames, then assembling the left and right fork legs, the lifting frames and the left and right support plates to form a lifting frame, and then welding. The manufacturing method has the following problems: 1. The left fork leg and the right fork leg are firstly processed and then welded, and the coaxiality of the left pin shaft mounting hole and the right pin shaft mounting hole at the front end of the fork leg is poor due to the existence of welding deformation after welding, so that the stability of a vehicle in running is directly affected; 2. the left fork leg, the right fork leg, the lifting frame and the left support plate and the right support plate are assembled to form a lifting frame, and assembly errors are easy to occur in the assembly process, so that the concentricity deviation of pin shaft holes on the left support plate and the right support plate is larger; 3. After the assembly, the lifting frame assembly is welded, and the concentricity deviation of pin shaft holes on the left support plate and the right support plate is larger due to welding deformation; 4. the technological method has the advantages of more working procedures, long flow, more material transportation, more equipment and tool clamps, more occupied production area, low production efficiency and high cost of the chassis assembly of the vehicle frame. Disclosure of Invention Based on the above, the invention aims to provide a manufacturing method of the lifting frame assembly of the pallet truck, which can improve the manufacturing precision and the production efficiency of the lifting frame assembly and reduce the production cost. In order to achieve the above purpose, the present invention adopts the following technical scheme: The invention provides a manufacturing method of a pallet truck lifting frame assembly, which comprises the following steps: s1, assembling a left fork leg, welding, assembling a right fork leg and welding; S2, processing a pin shaft mounting hole on the left fork leg and the right fork leg; s3, assembling and welding a frame assembly, and processing a shaft head mounting hole on the frame assembly; S4, assembling the roller shaft heads on the frame assembly and then welding to form a shaft head frame assembly; S5, assembling the left fork leg and the right fork leg on the shaft head frame assembly, and welding to form the lifting frame assembly. According to the invention, the pin shaft mounting holes are respectively processed after the left fork leg and the right fork leg are formed by assembly and welding, and the shaft head mounting holes are processed after the frame assembly is formed by assembly and welding, so that the dimensional deviation caused by welding deformation can be effectively eliminated, the dimensional precision of the left fork leg, the right fork leg and the roller shaft head is improved, the flow of adverse precision control caused by the first processing and the second welding is reduced, and the manufacturing precision of the lifting frame assembly is improved. As a further improvement of the above solution of the present invention, in step S1, the left fork leg includes a left fork body, a left pin shaft mounting plate, a left reinforcing plate, two left support plates and a left rib plate, and the assembling and welding of the left fork leg include: assembling a left pin shaft mounting plate, a left reinforcing plate and two left support plates on a left fork body, and assembling a left rib plate on the two left support plates; The left pin shaft mounting plate, the left reinforcing plate, the two left support plates and the left fork body are welded and connected, and then the left rib plate is welded and connected with the two left support plates; As a further improvement of the above-mentioned solution of the present invention, in step S1, the right fork leg includes a right fork body, a right