A swing arm for a fork lift truck

Abstract

The utility model relates to the technical field of fork truck rocker arm, concretely relates to a fork truck rocker arm, including rocker arm subassembly, the rocker arm subassembly includes main rocker arm, both ends of main rocker arm all are provided with rotatable secondary rocker arm unit, the secondary rocker arm unit includes the additional connection rod, the position of main rocker arm close to secondary rocker arm unit is provided with the limiting post, the one end of additional connection rod is provided with the sleeve hole, and the sleeve hole can be set in the outside of limiting post, still be provided with the second through -hole in the limiting post, still be provided with the fixed bolt of fixing additional connection rod on main rocker arm in the sleeve hole and the second through -hole. The utility model is through setting adjustable secondary rocker arm unit, to adapt to different models of fork truck connecting rod subassembly.

Description

Technical Field

[0001] This utility model relates to the field of forklift rocker arm technology, specifically a rocker arm for forklifts. Background Technology

[0002] Forklifts, as material handling equipment, are widely used in warehousing, ports, construction sites, and other scenarios. The transmission reliability of their mast system directly affects operational efficiency and safety. The rocker arm, as a key transmission unit of the mast system, is mainly used to connect the lifting cylinder, tilting cylinder, and mast beam, realizing the lifting adjustment and tilting angle control of the forks through force transmission.

[0003] Existing forklift rocker arm assemblies generally adopt a one-piece molding manufacturing process, specifically including three mainstream methods: integral casting of cast iron, integral welding of steel plates, or integral forging of aluminum alloy. The structural characteristics of this type of one-piece molded rocker arm are: the holes, interface angles, and dimensions on the rocker arm body used to connect the connecting rod assembly are all fixed designs, and molds or tooling need to be customized according to the connecting rod position parameters of a specific forklift model during the production process.

[0004] Although a one-piece molded rocker arm can meet the basic transmission requirements of a single forklift model, its fixed structural design has insurmountable defects when adapting to different forklift models. Specifically, because the spacing of the connecting holes and the interface angle of the one-piece molded rocker arm are fixed, the rocker arm cannot be connected to the connecting rod assembly when facing different forklift models. For companies that own multiple forklift models, they need to keep spare parts for different models separately, which not only increases the cost of spare parts procurement, but also easily leads to incorrect installation due to confusion of spare parts models, thus prolonging equipment downtime for maintenance. Utility Model Content

[0005] The purpose of this utility model is to provide a rocker arm for forklifts, which can be adapted to different models of forklift linkage assemblies by setting an adjustable secondary rocker arm unit.

[0006] To address the problems of existing technologies, this utility model provides a rocker arm for forklifts, including a rocker arm assembly. The rocker arm assembly includes a main rocker arm, and each end of the main rocker arm is provided with a rotatable secondary rocker arm unit. Each secondary rocker arm unit includes an extension rod. A limit post is provided on the main rocker arm near the secondary rocker arm unit. One end of the extension rod has a sleeve hole that can be fitted onto the outside of the limit post. The limit post also has a second through hole. Fixing bolts for fixing the extension rod to the main rocker arm are provided in the sleeve hole and the second through hole.

[0007] Preferably, the outer side of the limiting post is uniformly provided with first limiting teeth, and the inner side of the sleeve hole is provided with second limiting teeth that can cooperate with the first limiting teeth.

[0008] Preferably, the secondary rocker arm unit further includes a sliding groove opened along the length direction of the connecting rod, and the secondary rocker arm unit further includes a secondary rocker arm head, one end of which is provided with a secondary rocker arm slide, and the secondary rocker arm slide can be slidably disposed in the sliding groove.

[0009] Preferably, the secondary rocker arm unit further includes a through groove formed in the slide groove, one end of the secondary rocker arm slide is provided with a guide block that can cooperate with the through groove, and the guide block is also provided with a threaded hole, and the secondary rocker arm head is provided with a first through hole.

[0010] Preferably, two limiting blocks are provided on the side of the connecting rod away from the slide groove, and an adjusting screw is rotatably provided in the limiting block, and the adjusting screw engages with the screw hole of the guide block.

[0011] Preferably, the surfaces of the main rocker arm, the extension rod, and the secondary rocker arm head are all provided with an anti-corrosion layer.

[0012] Preferably, the rocker arm assembly has two components, and a connecting rod is provided between the two rocker arm assemblies. The rocker arm assembly has mounting holes.

[0013] Preferably, the rocker arm assembly is connected and fixed to the connecting rod by bolts passing through the mounting holes and screwing into the connecting rod.

[0014] The advantages of this utility model compared to the prior art are:

[0015] This application achieves compatibility with multiple forklift models by constructing a modular adjustment structure. The specific technical solution is as follows: A main rocker arm is set as the core load-bearing base. Adjustable secondary rocker arm units are assembled at both ends of the main rocker arm. Each secondary rocker arm unit includes key components such as an extension rod and a secondary rocker arm head. One end of the extension rod is machined with a sleeve hole, which forms a rotational fit with a limiting post located at a corresponding position on the main rocker arm, providing basic support for angle adjustment. When it is necessary to adapt to the included angle of the connecting rod assembly of different forklift models, the fixing bolts used to lock the relative position of the extension rod and the main rocker arm are loosened. The extension rod rotates around the axis of the limiting post, thereby adjusting the included angle between the extension rod and the main rocker arm. The first and second limiting teeth located at the mating surfaces of the extension rod and the main rocker arm form a meshing limit, ensuring the structural stability after angle locking and preventing angle deviation during heavy-load transmission of the forklift. To accommodate the varying hole spacing of connecting rod assemblies on different forklift models, the secondary rocker arm unit is equipped with an adjusting screw, a guide block, and a secondary rocker arm slide. The secondary rocker arm slide engages with the groove of the connecting rod; the adjusting screw engages with the threaded hole of the guide block. By rotating the adjusting screw, the threaded drive moves the guide block along the axis of the adjusting screw, which in turn pushes the secondary rocker arm slide along the groove of the connecting rod, ultimately achieving linear adjustment of the secondary rocker arm head position. This allows the connecting hole of the secondary rocker arm head to mate with connecting rod assemblies on different forklift models, effectively solving the problem of poor compatibility of existing one-piece molded rocker arms. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the two rocker arm components of a forklift rocker arm according to the present invention.

[0017] Figure 2 This is a schematic diagram of the three-dimensional structure of a rocker arm for a forklift according to this utility model.

[0018] Figure 3 This is a first exploded structural diagram of a rocker arm for a forklift according to this utility model.

[0019] Figure 4 This is a schematic diagram of the second exploded structure of a rocker arm for a forklift according to this utility model.

[0020] Figure 5 This utility model relates to a rocker arm for forklifts. Figure 4 Enlarged structural diagram at point A in the middle.

[0021] The following are the labels in the diagram: 1. Rocker arm assembly; 11. Main rocker arm; 12. Mounting hole; 13. Secondary rocker arm unit; 131. Extension rod; 1311. Limiting block; 1312. Slide groove; 1313. Through groove; 1314. Sleeve hole; 1315. Secondary limiting tooth; 132. Secondary rocker arm head; 1321. Secondary rocker arm slide; 1322. First through hole; 1323. Guide block; 133. Adjusting screw; 134. Fixing bolt; 14. Limiting post; 141. First limiting tooth; 142. Second through hole; 2. Connecting rod. Detailed Implementation

[0022] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0023] Reference Figures 1-5 As shown, this utility model provides a rocker arm for a forklift, including a rocker arm assembly 1. The rocker arm assembly 1 includes a main rocker arm 11, and both ends of the main rocker arm 11 are provided with rotatable secondary rocker arm units 13. Each secondary rocker arm unit 13 includes an extension rod 131. A limit post 14 is provided on the main rocker arm 11 near the secondary rocker arm unit 13. One end of the extension rod 131 is provided with a sleeve hole 1314, and the sleeve hole 1314 can be sleeved on the outside of the limit post 14. A second through hole 142 is also provided in the limit post 14. A fixing bolt 134 for fixing the extension rod 131 to the main rocker arm 11 is also provided in the sleeve hole 1314 and the second through hole 142.

[0024] The extension rod 131 is fitted onto the limiting post 14 of the main rocker arm 11 through the sleeve hole 1314. After aligning the sleeve hole 1314 with the second through hole 142, the fixing bolt 134 is inserted to complete the assembly. The forklift power mechanism drives the main rocker arm 11 to move, and the main rocker arm 11 transmits force to the extension rod 131 of the secondary rocker arm unit 13 through the limiting post 14. This in turn drives the forklift's connecting rod to rotate. When the angle of the extension rod 131 needs to be adjusted, the fixing bolt 134 is loosened to adjust the angle of the extension rod 131.

[0025] The outer side of the limiting post 14 is uniformly provided with first limiting teeth 141, and the inner side of the sleeve hole 1314 is provided with second limiting teeth 1315 that can cooperate with the first limiting teeth 141.

[0026] When the fixing bolt 134 is loosened, the pressure between the extension rod 131 and the limiting post 14 decreases, and the second limiting tooth 1315 disengages from the first limiting tooth 141. The extension rod 131 can then rotate flexibly around the limiting post 14 until the desired angle is achieved. After adjustment, the fixing bolt 134 is tightened, and the extension rod 131 is pressed against the limiting post 14. The second limiting tooth 1315 engages with the first limiting tooth 141, effectively preventing relative sliding between the extension rod 131 and the limiting post 14, thus achieving rigid angle locking.

[0027] The secondary rocker arm unit 13 further includes a sliding groove 1312 formed along the length of the connecting rod 131. The secondary rocker arm unit 13 also includes a secondary rocker arm head 132, one end of which is provided with a secondary rocker arm slide 1321, which is slidably disposed within the sliding groove 1312. The secondary rocker arm unit 13 also includes a through groove 1313 formed in the sliding groove 1312. One end of the secondary rocker arm slide 1321 is provided with a guide block 1323 that engages with the through groove 1313, and the guide block 1323 is also provided with a threaded hole. The secondary rocker arm head 132 is provided with a first through hole 1322. Two limiting blocks 1311 are provided on the side of the connecting rod 131 away from the sliding groove 1312, and an adjusting screw 133 is rotatably disposed within the limiting block 1311, engaging with the threaded hole of the guide block 1323.

[0028] Rotating the adjusting screw 133 (which only rotates due to its axial movement being restricted by the limiting block 1311) causes the guide block 1323 to slide along the through groove 1313 via threaded engagement. This, in turn, causes the secondary rocker arm slider 1321 to move synchronously within the slide groove 1312, thus adjusting the length of the secondary rocker arm head 132 extending or retracting the connecting rod 131. Once adjusted to the correct position, the self-locking property of the thread prevents the guide block 1323 from sliding.

[0029] The surfaces of the main rocker arm 11, the extension rod 131, and the secondary rocker arm head 132 are all provided with an anti-corrosion layer.

[0030] To resist corrosive factors in the forklift operating environment and prevent rust and oxidation of the base materials (usually metal) of the main rocker arm 11, extension rod 131, and secondary rocker arm head 132, thus protecting structural integrity, the anti-corrosion layer can be hot-dip galvanized. Its core characteristic is extremely strong corrosion resistance; the zinc layer bonds tightly to the base material, covering complex areas such as component edges and welds, and resisting long-term corrosion from outdoor rain and humid air. Alternatively, chrome plating can be used. Chrome plating has high surface hardness and smoothness, reducing frictional resistance between moving parts and improving wear resistance while providing corrosion protection.

[0031] The rocker arm assembly 1 has two parts, and a connecting rod 2 is provided between the two rocker arm assemblies 1. The rocker arm assembly 1 has a mounting hole 12. The rocker arm assembly 1 is connected and fixed to the connecting rod 2 by bolts passing through the mounting hole 12 and screwing into the connecting rod 2.

[0032] Two rocker arm assemblies 1 are symmetrically distributed on both sides of the forklift actuator (such as the fork carriage), forming a "double-sided support" structure. Their function is to: prevent structural displacement or deformation caused by single-sided rocker arm load-bearing, especially when the forklift is handling heavy objects; to transmit power synchronously on both sides, distributing the load; to ensure consistent movement on both sides of the forklift actuator (such as the forks); and to connect the two independent rocker arm assemblies 1 into a rigid whole, improving the structure's resistance to torsion and deformation.

[0033] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A rocker arm for a forklift, characterized in that: The device includes a rocker arm assembly (1), which includes a main rocker arm (11). Both ends of the main rocker arm (11) are provided with rotatable secondary rocker arm units (13). Each secondary rocker arm unit (13) includes an extension rod (131). A limit post (14) is provided near the secondary rocker arm unit (13) on the main rocker arm (11). One end of the extension rod (131) is provided with a sleeve hole (1314), which can be sleeved on the outside of the limit post (14). A second through hole (142) is also provided in the limit post (14). Fixing bolts (134) for fixing the extension rod (131) to the main rocker arm (11) are also provided in the sleeve hole (1314) and the second through hole (142).

2. A rocker arm for a forklift according to claim 1, characterized in that: The outer side of the limiting post (14) is uniformly provided with first limiting teeth (141), and the inner side of the sleeve hole (1314) is provided with second limiting teeth (1315) that can cooperate with the first limiting teeth (141).

3. A rocker arm for a forklift according to claim 1, characterized in that: The secondary rocker arm unit (13) further includes a slide groove (1312) opened along the length direction of the connecting rod (131), and the secondary rocker arm unit (13) further includes a secondary rocker arm head (132). One end of the secondary rocker arm head (132) is provided with a secondary rocker arm slide (1321), and the secondary rocker arm slide (1321) can be slidably disposed in the slide groove (1312).

4. A rocker arm for a forklift according to claim 3, characterized in that: The secondary rocker arm unit (13) further includes a through groove (1313) formed in the slide groove (1312). One end of the secondary rocker arm slide (1321) is provided with a guide block (1323) that can cooperate with the through groove (1313), and the guide block (1323) is also provided with a threaded hole. The secondary rocker arm head (132) is provided with a first through hole (1322).

5. A rocker arm for a forklift according to claim 4, characterized in that: Two limiting blocks (1311) are provided on the side of the connecting rod (1311) away from the slide groove (1312), and an adjusting screw (133) is rotatably provided in the limiting block (1311), and the adjusting screw (133) engages with the screw hole of the guide block (1323).

6. A rocker arm for a forklift according to claim 5, characterized in that: The surfaces of the main rocker arm (11), the extension rod (131), and the secondary rocker arm head (132) are all provided with an anti-corrosion layer.

7. A rocker arm for a forklift according to claim 1, characterized in that: The rocker arm assembly (1) has two parts, and a connecting rod (2) is provided between the two rocker arm assemblies (1). The rocker arm assembly (1) is provided with mounting holes (12).

8. A rocker arm for a forklift according to claim 7, characterized in that: The rocker arm assembly (1) is connected and fixed to the connecting rod (2) by bolts passing through the mounting hole (12) and screwing into the connecting rod (2).

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