Oil cylinder limiting structure for crane

Abstract

The utility model discloses an oil cylinder limit structure for a crane, which comprises an upper roller component, a lower roller component and side slider components, the upper roller component is fixedly connected to the upper side of an arm tail structural member, the lower roller component is fixedly connected to the lower side of the arm tail structural member, and the side slider components are fixedly connected to two sides of the arm tail structural member. The upper rolling wheel assembly, the lower rolling wheel assembly and the side sliding block assembly conduct four-direction limiting on the telescopic oil cylinder of the crane. According to the utility model, the problem of interference and damage of movement of the oil cylinder in the telescopic mechanism of the crane is solved, the working reliability of the telescopic mechanism is improved, and certain operation space is provided for structural optimization of an arm body.

Description

Technical Field

[0001] The utility model relates to the field of cranes, in particular to an oil cylinder limiting structure for cranes. Background Art

[0002] With the popularization of crane applications, the market has higher requirements for the telescopic mechanism of cranes. The telescopic cylinder in the telescopic mechanism is a key component for realizing the telescopic arm. It is usually built inside the telescopic arm. Due to the limitation of the arm structure space, higher requirements are put forward for the limit protection of the telescopic cylinder. At present, the structure of the crane boom is relatively complex, especially the multi-section boom telescopic structure. The pursuit of extremes in structural size, lightweight, cost, material, etc. leads to a more compact boom structure, especially the overlap between the tail of the boom and the previous section of the boom. While ensuring the structural performance, the space is compressed greatly, which inevitably leads to more limited assembly and movement space of the telescopic cylinder. At the same time, after the arm is extended, the natural deflection of the arm structure also compresses the activity space of the telescopic cylinder to a certain extent. During the movement of the telescopic cylinder, interference is likely to occur, resulting in collision and wear of the telescopic cylinder, reducing its life and even damage. In addition, in order to pursue the improvement of the load-bearing telescopic performance of the arm, it is usually adopted to increase the outer diameter of the cylinder, which will further compress its activity space. At present, in order to avoid interference with the movement of the telescopic cylinder, due to the limitation of the internal structure of the arm, the main approach is to control the arm space, or even impose no restriction, which easily leads to frequent wear and damage of the telescopic cylinder.

[0003] Therefore, it is necessary to develop a targeted limit structure for the hydraulic cylinder of the crane to ensure the safety of the telescopic cylinder movement and its continuous and effective operation in a more economical and effective manner. Utility Model Content

[0004] Purpose of the utility model: In view of the shortcomings and defects of the prior art, the utility model provides a cylinder limit structure for a crane, which solves the problem of interference damage to the cylinder movement in the telescopic mechanism of the crane, improves the working reliability of the telescopic mechanism, and provides a certain operating margin for the optimization of the arm structure.

[0005] Technical solution: The utility model is a cylinder limiting structure for a crane, which is characterized by comprising an upper roller assembly, a lower roller assembly and a side slider assembly, the upper roller assembly is fixedly connected to the upper side of the arm tail structure, the lower roller assembly is fixedly connected to the lower side of the arm tail structure, the side slider assembly is fixedly connected to both sides of the arm tail structure, and the upper roller assembly, the lower roller assembly and the side slider assembly limit the crane telescopic cylinder in four directions.

[0006] Wherein, the upper roller assembly comprises a shaft 1, a roller 1, a spacer sleeve and a retaining ring which are connected in sequence.

[0007] Wherein, the lower roller assembly comprises a second shaft, a second roller, a washer and a cotter pin which are connected in sequence.

[0008] Among them, the shaft 2 is a stepped shaft structure, and the shaft 2 includes a shaft head, a large shaft diameter section, a small shaft diameter section and a shaft tail which are connected in sequence.

[0009] Among them, the structural member connected to the second shaft is provided with a large installation shaft hole and a small installation shaft hole, the shaft tail passes through the second roller, the small shaft diameter section passes through the small installation shaft hole, and the large shaft diameter section passes through the large installation shaft hole.

[0010] Wherein, the side slider assembly includes screw 1, side slider, side slider mounting plate, spring washer and screw 2.

[0011] Wherein, the screw passes through the hole of the side slider and is connected to the side slider mounting plate.

[0012] Wherein, the second screw passes through the spring washer and is connected to the side slider mounting plate.

[0013] Beneficial effects: Compared with the prior art, the utility model has the following significant advantages:

[0014] When the oil cylinder of a crane arm or other similar structures is performing telescopic operation, the oil cylinder limit device can effectively prevent the oil cylinder from being damaged by eccentric wear, thereby increasing the service life of the oil cylinder and the working reliability of the telescopic mechanism.

[0015] When the crane arm and other similar structures require a compact design, the cylinder limit device can ensure the compactness of the structure and high space utilization by adjusting the assembly method. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2 It is a structural schematic diagram of the upper roller assembly of the utility model;

[0018] Figure 3 It is a structural schematic diagram of the lower roller assembly of the utility model;

[0019] Figure 4 It is a structural schematic diagram of the second shaft of the utility model;

[0020] Figure 5 It is a structural schematic diagram of the side slider assembly of the utility model;

[0021] In the figure, 1 is an upper roller assembly; 11 is shaft one; 12 is roller one; 13 is a spacer; 14 is a retaining ring; 2 is a lower roller assembly; 21 is shaft two; 211 is a shaft head; 212 is a large shaft diameter section; 213 is a shaft tail; 22 is roller two; 23 is a washer; 24 is a cotter pin; 3 is a side slider assembly; 31 is a screw one; 32 is a side slider; 33 is a side slider mounting plate; 34 is a spring washer; 35 is a screw two; 4 is an arm tail structure; and 5 is a crane telescopic cylinder. DETAILED DESCRIPTION

[0022] The technical solution of the utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The utility model of the hydraulic cylinder limit structure for crane comprises: an upper roller assembly 1, a lower roller assembly 2, and a side slider assembly 3, as shown in the attached Figure 1 The upper roller assembly 1 is fixedly connected to the upper side of the boom tail structure 4, the lower roller assembly 2 is fixedly connected to the lower side of the boom tail structure 4, and the side slider assembly 3 is fixedly connected to both sides of the boom tail structure 4. During the telescopic process of the crane telescopic cylinder 5, due to errors in design, assembly, manufacturing, etc., it will cause it to deviate in the upper, lower, left and right directions. By using the upper roller assembly 1, the lower roller assembly 2 and the side slider assembly 3 to effectively limit the crane telescopic cylinder 5 in four directions, the movement interference wear of the telescopic cylinder in the telescopic mechanism can be more effectively avoided.

[0024] Since the cylinder body of the crane telescopic oil cylinder 5 and the boom tail structure 4 are in a relative motion state when the boom body is extended, in order to reduce the wear of the cylinder body as much as possible, the upper roller assembly 1 is composed of a shaft 11, a roller 12, a spacer 13, and a retaining ring 14, see attached Figure 2 The lower roller assembly 2 is composed of the second roller 22, the second shaft 21, the washer 23, and the split pin 24, as shown in the attached Figure 3 . When the oil cylinder interference is inevitable, the rollers roll in contact, which can eliminate wear and tear to the greatest extent. For the lower roller assembly 2, when the arm structure is compact, it is easy to have insufficient installation space. To solve this problem, the structural member connected to the shaft 21 is equipped with unequal diameter installation holes. On the structural member with a larger through hole, an open notch is reserved above the hole. The spacing between the notches is not greater than the diameter of the installation shaft. At the same time, the shaft 11 is designed as a stepped shaft, see attached Figure 4 A large diameter section 212 is reserved at the shaft head 211, and the shaft diameter is adapted to the larger installation shaft hole. During installation, the shaft tail 213 can first pass through the roller 22, pass through the notch, and then pass through the small diameter installation hole to complete the installation. It can effectively limit the shaft 21 without being restricted by space.

[0025] When the crane is working, the boom body has the working condition of variable amplitude rise and fall around the boom tail, and the crane telescopic cylinder 5 inside the boom body also has a small range of wave swing around the cylinder hinge point. Therefore, the side slider assembly 3 is arranged on both sides of the cylinder body. The side slider assembly 3 mainly includes a screw 1 31, a side slider 32, a side slider mounting plate 33, a spring washer 34, and a screw 2 35. See the attached Figure 5 The side slider 32 is made of a material with excellent wear resistance and has a long rectangular surface to increase the contact area and further reduce the eccentric wear damage of the oil cylinder.

[0026] Due to the compact internal structure of the arm body, the upper roller assembly 1, the lower roller assembly 2 and the side slider assembly 3 impose certain restrictions on the installation space. In order to solve this problem, considering that the tail structure of the cylinder is larger than the outer dimensions of the cylinder itself, the assembly process of the upper roller assembly 1 and the side slider assembly 3 is arranged after the assembly of the crane telescopic cylinder 5. The upper roller assembly 1 is supported by its own shaft assembly and is not restricted by space. The side slider assembly 3 first assembles its own components, and then the installation is completed through the spring washers 34 and the screws 35 through the reserved process holes on both sides of the arm tail structure 4, thereby ensuring a compact structure without affecting the assembly of parts and components, and having good assembly processability.

Claims

1. A hydraulic cylinder limit structure for a crane, characterized in that: The crane comprises an upper roller assembly (1), a lower roller assembly (2) and a side slider assembly (3); the upper roller assembly (1) is fixedly connected to the upper side of a boom tail structure (4); the lower roller assembly (2) is fixedly connected to the lower side of the boom tail structure (4); and the side slider assembly (3) is fixedly connected to both sides of the boom tail structure (4); the upper roller assembly (1), the lower roller assembly (2) and the side slider assembly (3) limit the telescopic cylinder (5) of the crane in four directions.

2. The hydraulic cylinder limiting structure for a crane according to claim 1 is characterized in that: The upper roller assembly (1) comprises a shaft (11), a roller (12), a spacer (13) and a retaining ring (14) which are connected in sequence.

3. The hydraulic cylinder limiting structure for a crane according to claim 1 is characterized in that: The lower roller assembly (2) comprises a second shaft (21), a second roller (22), a washer (23) and a split pin (24) which are connected in sequence.

4. The hydraulic cylinder limiting structure for a crane according to claim 3 is characterized in that: The second shaft (21) is a stepped shaft structure, and the second shaft (21) comprises a shaft head (211), a large shaft diameter section (212), a small shaft diameter section and a shaft tail (213) which are connected in sequence.

5. The hydraulic cylinder limiting structure for a crane according to claim 4 is characterized in that: The structural member connected to the second shaft (21) is provided with a large installation shaft hole and a small installation shaft hole, the shaft tail (213) passes through the second roller (22), the small shaft diameter section passes through the small installation shaft hole, and the large shaft diameter section (212) passes through the large installation shaft hole.

6. The hydraulic cylinder limiting structure for a crane according to claim 1 is characterized in that: The side slider assembly (3) comprises a first screw (31), a side slider (32), a side slider mounting plate (33), a spring washer (34) and a second screw (35).

7. The hydraulic cylinder limiting structure for a crane according to claim 6 is characterized in that: The screw 1 (31) passes through the hole of the side slider (32) and is connected to the side slider mounting plate (33).

8. The hydraulic cylinder limiting structure for a crane according to claim 7, characterized in that: The second screw (35) passes through the spring washer (34) and is connected to the side slider mounting plate (33).

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