Hydraulic cylinder with anti-rotation structure

Abstract

The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with an anti-rotation structure, which comprises a cylinder barrel and a piston rod, the cylinder barrel comprises a cylinder bottom and a cylinder body, a guide hole is arranged at a position deviating from the central axis of the cylinder bottom by a certain distance on the cylinder bottom, and an anti-rotation rod component is arranged in the guide hole. The position, corresponding to the guide hole, of one end of the piston rod is provided with an installation hole allowing the anti-rotation rod assembly to stretch into, the anti-rotation rod assembly comprises an anti-rotation rod, a sliding bearing, a hole check ring and a connecting screw, the anti-rotation rod is sleeved with the sliding bearing, the sliding bearing is limited in the guide hole through the hole check ring, and the anti-rotation rod is provided with an inner hole; and a connecting screw penetrates through the inner hole and is connected to the mounting hole. The built-in anti-rotation structure is wide in application range, small in occupied space, simple in structure, relatively low in machining precision and reliable in anti-rotation effect, and the connection mode of an original hydraulic cylinder piston rod cannot be affected.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder with an anti-rotation structure. Background Art

[0002] Hydraulic cylinders, as hydraulic actuators, are widely used across various industries. In certain specific industries, customer requirements for hydraulic cylinders are becoming increasingly stringent, including the need to prevent the piston rod from rotating. Under normal circumstances, during reciprocating motion, the piston rod will rotate to some extent due to external forces or the cylinder's own problems. However, in certain applications, piston rod rotation is prohibited during use because it can cause the equipment frame to rotate, potentially causing equipment problems. Therefore, preventing piston rod rotation has become a pressing issue in this field.

[0003] Currently, the most common anti-rotation structure for hydraulic cylinder piston rods uses an external anti-rotation link. This design involves attaching a link to the piston rod, with one end secured to the rod and the other end secured to the customer's frame or external structural components of the hydraulic cylinder. However, this structure requires significant external space, and the hydraulic cylinder piston rod itself may lack sufficient space for securing the anti-rotation link. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in order to solve the problems existing in the prior art in the above background technology, a hydraulic cylinder with an anti-rotation structure is provided.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a hydraulic cylinder with an anti-rotation structure, including a cylinder barrel and a piston rod, the cylinder barrel including a cylinder bottom and a cylinder body, a guide hole is opened on the cylinder bottom at a position offset from its central axis by a certain distance, an anti-rotation rod assembly is inserted into the guide hole, a mounting hole for the anti-rotation rod assembly to extend into is opened at one end of the piston rod corresponding to the position of the guide hole, the anti-rotation rod assembly includes an anti-rotation rod and a connecting screw, the anti-rotation rod has an inner hole, and the connecting screw passes through the inner hole and is connected to the mounting hole.

[0006] The guide hole is offset from the center axis of the cylinder bottom by a certain distance, which can ensure that the anti-rotation rod assembly plays a reliable anti-rotation role.

[0007] Furthermore, the anti-rotation rod assembly also includes a sliding bearing and a hole retaining ring. The sliding bearing is sleeved outside the anti-rotation rod and is limited in the guide hole by the hole retaining ring.

[0008] The sliding bearing of the anti-rotation rod assembly is used to support the anti-rotation rod to prevent the anti-rotation rod from contacting the guide hole on the cylinder bottom due to flexible bending, thereby causing iron chips to affect the cleanliness of the oil and scratch the hydraulic cylinder seal to cause leakage; the hole retaining ring is used to limit the sliding bearing.

[0009] Furthermore, the guide hole is a slotted hole, and a first mounting groove for placing a sliding bearing is provided on the inner wall of the guide hole.

[0010] Furthermore, second mounting grooves for placing hole retaining rings are provided on the inner wall of the guide hole and at both ends of the first mounting groove.

[0011] For the long-stroke oil cylinder, further, the guide hole is a through hole, and a first mounting groove for placing the sliding bearing is opened on the inner wall of the guide hole.

[0012] Furthermore, second mounting grooves for placing hole retaining rings are provided on the inner wall of the guide hole and at both ends of the first mounting groove.

[0013] Furthermore, a sealing groove is provided on the inner wall of the middle section of the guide hole to ensure the sealing of the hydraulic cylinder.

[0014] Furthermore, dustproof grooves are provided on the guide hole near the bottom surface of the cylinder bottom and near the sealing groove to prevent external impurities from entering the hydraulic cylinder and affecting the use effect of the hydraulic cylinder.

[0015] Furthermore, the mounting hole includes a first mounting section and a second mounting section, and an internal thread is provided on the inner wall of the second mounting section.

[0016] Furthermore, the inner hole includes a countersunk hole section and a through hole section, and the inner diameter of the through hole section is smaller than the inner diameter of the countersunk hole section.

[0017] Beneficial effects of the utility model:

[0018] The utility model sets an anti-rotation rod inside the hydraulic cylinder. One end of the anti-rotation rod is fixed to the piston rod, and the other end extends into the guide hole at the bottom of the cylinder. In this way, the piston rod and the cylinder bottom are prevented from rotating relative to each other. Generally, the cylinder bottom of the hydraulic cylinder is a fixed part, so this structure can effectively prevent the piston rod of the hydraulic cylinder from rotating.

[0019] The utility model has a small space occupation, a simple structure, relatively low processing precision, a reliable anti-rotation effect, and will not affect the connection form of the original hydraulic cylinder piston rod;

[0020] The built-in anti-rotation structure has a wide range of applications and can be applied to long-stroke cylinders or short-stroke cylinders, especially short-stroke cylinders and compact hydraulic cylinders. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Figure 1 It is a structural diagram of embodiment 1 of the present utility model.

[0023] Figure 2 yes Figure 1 Schematic diagram of the enlarged structure at point A in the middle.

[0024] Figure 3 It is a structural schematic diagram of the cylinder bottom in the first embodiment of the present utility model.

[0025] Figure 4 yes Figure 3 Schematic diagram of the enlarged structure at point B in the middle.

[0026] Figure 5 It is a structural schematic diagram of the piston rod in the first embodiment of the present utility model.

[0027] Figure 6 It is a structural schematic diagram of the anti-rotation rod in the first embodiment of the present utility model.

[0028] Figure 7 It is a structural schematic diagram of the first embodiment of the present invention when the piston rod is in a fully extended state.

[0029] Figure 8 It is a structural diagram of the second embodiment of the present utility model.

[0030] Figure 9 It is a structural schematic diagram of the cylinder bottom in the second embodiment of the present utility model.

[0031] Figure 10 yes Figure 9 Schematic diagram of the enlarged structure at point C in the middle.

[0032] Figure 11 It is a structural schematic diagram of the second embodiment of the present invention when the piston rod is in a fully extended state.

[0033] In the figure: 1. Cylinder barrel; 11. Cylinder bottom; 111. Guide hole; 1111. First mounting groove; 1112. Second mounting groove; 1113. Sealing groove; 1114. Dustproof groove; 12. Cylinder body; 2. Piston rod; 21. Mounting hole; 211. First mounting section; 212. Second mounting section; 3. Anti-rotation rod assembly; 31. Anti-rotation rod; 311. Inner hole; 3111. Countersunk hole section; 3112. Through hole section; 32. Sliding bearing; 33. Retaining ring for hole; 34. Connecting screw. DETAILED DESCRIPTION

[0034] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0035] Example 1

[0036] like Figure 1 and Figure 2 As shown, a hydraulic cylinder with an anti-rotation structure includes a cylinder barrel 1 and a piston rod 2. The cylinder barrel 1 includes a cylinder bottom 11 and a cylinder body 12. The cylinder bottom 11 is connected to the cylinder body 12 by screws. A guide hole 111 is opened on the cylinder bottom 11 at a position offset from its central axis by a certain distance. An anti-rotation rod assembly 3 is inserted into the guide hole 111. A mounting hole 21 for the anti-rotation rod assembly 3 to extend into is opened at one end of the piston rod 2 corresponding to the position of the guide hole 111. The mounting hole 21 here needs to match the position of the guide hole 111 on the cylinder bottom 11 so that the anti-rotation rod assembly 3 can be correctly assembled later. The anti-rotation rod assembly 3 includes an anti-rotation rod 31, a sliding bearing 32, a hole retaining ring 33 and a connecting screw 34. The sliding bearing 32 is sleeved on the outside of the anti-rotation rod 31 and is limited in the guide hole 111 by the hole retaining ring 33. The anti-rotation rod 31 has an inner hole 311, and the connecting screw 34 passes through the inner hole 311 and is connected to the mounting hole 21.

[0037] like Figure 3 and Figure 4 As shown, the guide hole 111 is a slotted hole, and a first mounting groove 1111 for placing the sliding bearing 32 is opened on the inner wall of the guide hole 111. Second mounting grooves 1112 for placing the hole retaining ring 33 are opened on the inner wall of the guide hole 111 and at both ends of the first mounting groove 1111.

[0038] like Figure 5 As shown, the mounting hole 21 consists of a first mounting section 211 for mounting the anti-rotation rod 31 and a second mounting section 212 connected to a connecting screw 34. The inner wall of the second mounting section 212 is internally threaded. The connecting screw 34 can be adjusted appropriately based on the specific structure, specifications, and internal space of the hydraulic cylinder. The remaining screws can be selected from standard parts according to the national standard GB / T 70.1 to facilitate subsequent replacement. The hole retaining ring 33 is only used to limit the sliding sleeve 32 and can be selected from standard parts according to the national standard GB 895.1 to facilitate subsequent replacement. The sliding sleeve 32 supports the anti-rotation rod 31 and prevents it from flexing and contacting the guide hole 111 in the cylinder bottom 11. If contact occurs, iron filings may be generated during the reciprocating motion of the hydraulic cylinder, affecting the cleanliness of the oil and scratching the hydraulic cylinder seals, causing leakage.

[0039] like Figure 6As shown, the inner hole 311 includes a countersunk hole section 3111 and a through hole section 3112. The inner diameter of the through hole section 3112 is smaller than the inner diameter of the countersunk hole section 3111. The length of the anti-rotation rod 31 should be determined based on the stroke of the hydraulic cylinder and the internal structure to prevent the anti-rotation rod 31 from being separated from the guide hole 111 on the cylinder bottom 11 after the piston rod 2 of the hydraulic cylinder is fully extended. Figure 7 As shown, this is a schematic diagram of the state where the piston rod 2 is fully extended.

[0040] Example 2

[0041] For a long-stroke hydraulic cylinder, the anti-rotation rod 31 needs to be longer, and the thickness of the cylinder bottom 11 may not be enough to completely cover the length of the anti-rotation rod 31. In this case, the guide hole 111 on the cylinder bottom 11 can be set as a through hole, such as Figure 8 The difference from the first embodiment is that: Figure 9 and Figure 10 As shown, a sealing groove 1113 is provided on the inner wall of the middle section of the guide hole 111. Dustproof grooves 1114 are provided on the guide hole 111 near the bottom surface of the cylinder bottom 11 and near the sealing groove 1113. The dustproof groove 1114 is provided to prevent external impurities from entering the interior of the hydraulic cylinder. At the same time, a sealing groove 1113 is also required to be designed for sealing the hydraulic cylinder. Similarly, a sliding sleeve 32 is required to support the anti-rotation rod 31, and a second mounting groove 1112 is used for mounting a retaining ring 33 for the hole to prevent the sliding sleeve 32 from shifting during the operation of the hydraulic cylinder. Such a structure is suitable for long-stroke hydraulic cylinders. The piston rod 2 of the hydraulic cylinder is in a fully extended state as shown in FIG. Figure 11 Similarly, in this case, the length of the anti-rotation rod 31 needs to be reasonably designed to ensure that the sealing ring can act on the anti-rotation rod 31 and play a sealing role when the hydraulic cylinder is fully extended.

[0042] The built-in hydraulic cylinder piston rod anti-rotation structure of Example 1 or Example 2 has the characteristics of simple structure, easy assembly, low processing precision requirements, wide range of applications, and small space occupation. It can effectively prevent the hydraulic cylinder piston rod from rotating and will not take up too much external space. For short-stroke hydraulic cylinders, this anti-rotation structure can be completely built into the hydraulic cylinder and will not take up external space.

[0043] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A hydraulic cylinder with an anti-rotation structure, comprising a cylinder barrel (1) and a piston rod (2), characterized in that: The cylinder barrel (1) includes a cylinder bottom (11) and a cylinder body (12); a guide hole (111) is provided on the cylinder bottom (11) at a position offset from its central axis by a certain distance; an anti-rotation rod assembly (3) is inserted into the guide hole (111); a mounting hole (21) for the anti-rotation rod assembly (3) to extend into is provided at one end of the piston rod (2) at a position corresponding to the guide hole (111); the anti-rotation rod assembly (3) includes an anti-rotation rod (31) and a connecting screw (34); the anti-rotation rod (31) has an inner hole (311); the connecting screw (34) passes through the inner hole (311) and is connected to the mounting hole (21).

2. The hydraulic cylinder with an anti-rotation structure according to claim 1, characterized in that: The anti-rotation rod assembly (3) further comprises a sliding bearing (32) and a hole retaining ring (33); the sliding bearing (32) is sleeved outside the anti-rotation rod (31) and is limited in the guide hole (111) by the hole retaining ring (33).

3. The hydraulic cylinder with an anti-rotation structure according to claim 2, characterized in that: The guide hole (111) is a slotted hole, and a first mounting groove (1111) for placing the sliding bearing (32) is provided on the inner wall of the guide hole (111).

4. The hydraulic cylinder with an anti-rotation structure according to claim 3, characterized in that: Second installation grooves (1112) for placing hole retaining rings (33) are provided on the inner wall of the guide hole (111) and at both ends of the first installation groove (1111).

5. The hydraulic cylinder with an anti-rotation structure according to claim 2, characterized in that: The guide hole (111) is a through hole, and a first mounting groove (1111) for placing the sliding bearing (32) is provided on the inner wall of the guide hole (111).

6. The hydraulic cylinder with an anti-rotation structure according to claim 5, characterized in that: Second installation grooves (1112) for placing hole retaining rings (33) are provided on the inner wall of the guide hole (111) and at both ends of the first installation groove (1111).

7. The hydraulic cylinder with an anti-rotation structure according to claim 6, characterized in that: A sealing groove (1113) is provided on the inner wall of the middle section of the guide hole (111).

8. The hydraulic cylinder with an anti-rotation structure according to claim 7, characterized in that: Dust-proof grooves (1114) are provided on the guide hole (111) near the bottom surface of the cylinder bottom (11) and near the sealing groove (1113).

9. The hydraulic cylinder with an anti-rotation structure according to claim 3 or 5, characterized in that: The mounting hole (21) comprises a first mounting section (211) and a second mounting section (212), wherein an inner wall of the second mounting section (212) is provided with an internal thread.

10. The hydraulic cylinder with an anti-rotation structure according to claim 3 or 5, characterized in that: The inner hole (311) comprises a countersunk hole section (3111) and a through hole section (3112), and the inner diameter of the through hole section (3112) is smaller than the inner diameter of the countersunk hole section (3111).

Images