Self-locking hydraulic cylinder

Abstract

The utility model discloses a self-locking type hydraulic cylinder which comprises a piston rod, a first cylinder body and a second cylinder body connected with the first cylinder body, and the first cylinder body and the second cylinder body are respectively provided with a displacement space for the piston rod to move in a reciprocating mode in the axial direction. Wherein a plurality of locking tables are arranged on the inner side of the second cylinder body in the axial direction at intervals, each locking table is provided with a first locking face, the piston rod is provided with a locking piece, each locking piece is provided with a second locking face matched with the corresponding first locking face, and the locking pieces and the locking tables form a self-locking structure. According to the displacement space, the first cylinder body and the second cylinder body are each provided with a cavity for the piston rod to move, and when the piston rod reaches the specified position and needs to be self-locked, the second locking face of the piston rod makes contact with the first locking face of the locking table at the corresponding position to form self-locking. Therefore, the piston rod can be self-locked at different positions.

Description

Technical Field

[0001] The utility model relates to the technical field of oil cylinders, in particular to a self-locking hydraulic cylinder. Background Art

[0002] Hydraulic cylinder self-locking is divided into oil circuit self-locking and mechanical self-locking. Oil circuit self-locking means adding a valve to maintain pressure so that the hydraulic oil of the oil cylinder does not return to the oil tank, and the oil chamber of the oil cylinder is filled with oil at a certain pressure. However, this pressure-maintaining self-locking is not very safe and reliable. If there is a leak, the plunger will slowly return to its position. Mechanical self-locking means adding a nut to the plunger of the oil cylinder. When the oil cylinder rises to the required position, the nut on the plunger of the oil cylinder is rotated to the bottom and contacts the cylinder body, so that the plunger will be fixed to the required height. When the pressure needs to be relieved, the nut is screwed on to return the plunger.

[0003] However, in the prior art, most of the existing self-locking oil cylinders adopt a single-stroke self-locking structure, that is, the locking can only be completed in a specific formation. The single-stroke self-locking structure is difficult to meet the working requirements of the hydraulic cylinder. Summary of the invention

[0004] The technical problem to be solved by the utility model is: the utility model provides a self-locking hydraulic cylinder to solve the problem of narrow application range of single-stroke self-locking.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a self-locking hydraulic cylinder, comprising a piston rod, a first cylinder body, and a second cylinder body connected to the first cylinder body, wherein the first cylinder body and the second cylinder body are both provided with a displacement space for the piston rod to reciprocate along the axial direction;

[0006] Among them, a plurality of locking platforms are arranged at intervals along the axial direction on the inner side of the second cylinder body, the locking platform has a first locking surface, the piston rod is provided with a locking member, the locking member is provided with a second locking surface adapted to the first locking surface, and the locking member and the locking platform form a self-locking structure.

[0007] The beneficial effects of the utility model are as follows: the displacement space refers to that both the first cylinder body and the second cylinder body are provided with cavities for the piston rod to move, and when the piston rod reaches a specified position and needs to be self-locked, the second locking surface of the piston rod contacts the first locking surface of the locking platform at the corresponding position to form self-locking, and through multiple locking platforms arranged at intervals along the axial direction, the piston rod can form self-locking at different positions.

[0008] Preferably, the locking member comprises a sleeve, a spring steel sheet arranged on the sleeve at intervals along the circumferential direction, the second locking surface is arranged on a side of the spring steel sheet away from the sleeve, and an electromagnet is arranged on the piston rod.

[0009] Preferably, the outer peripheral surface of the piston rod is provided with an external thread, and the sleeve and / or the electromagnet is provided with an internal thread adapted to the external thread;

[0010] And / or, the spring steel sheet is provided with a receiving groove along the circumferential direction, and a reinforcing member is arranged in the receiving groove.

[0011] Preferably, the piston rod is provided with a boss, and a side of the boss facing the sleeve is provided with anti-slip patterns.

[0012] Preferably, the first cylinder body is provided with a first oil inlet hole, the second cylinder body is provided with a second oil inlet hole, and the first cylinder body is provided with a wiring hole;

[0013] And / or, the first cylinder body is provided with a guide cylinder.

[0014] Preferably, a fastener is provided between the first cylinder body and the second cylinder body;

[0015] The fastener includes a fastening bolt and a nut matched with the fastening bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional structural schematic diagram of a self-locking hydraulic cylinder;

[0017] Figure 2 It is a cross-sectional view of a self-locking hydraulic cylinder;

[0018] Figure 3 for Figure 2 A partial enlarged view of the middle A;

[0019] Figure 4 It is a schematic diagram of the three-dimensional structure of the piston rod.

[0020] In the figure: 1. first cylinder body; 11. guide cylinder; 12. first oil inlet hole; 13. wiring hole; 2. second cylinder body; 21. second oil inlet hole; 22. locking platform; 3. piston rod; 31. boss; 32. sleeve; 33. spring steel sheet; 34. reinforcement; 35. electromagnet; 41. fastening bolt; 42. nut. DETAILED DESCRIPTION

[0021] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] In this article, the terms "upper, lower, inside, outside" and the like are established based on the positional relationships shown in the drawings. The corresponding positional relationships may also change depending on the drawings, and therefore cannot be understood as absolute limitations on the scope of protection; moreover, relational terms such as "first" and "second" and the like are merely used to distinguish one component from another with the same name, and do not necessarily require or imply any actual relationship or order between these components.

[0023] Example

[0024] like Figure 1-4 As shown, a self-locking hydraulic cylinder includes a piston rod 3, a first cylinder body 1, and a second cylinder body 2 connected to the first cylinder body 1, wherein the first cylinder body 1 and the second cylinder body 2 are both provided with a displacement space for the piston rod 3 to reciprocate along the axial direction; wherein, a plurality of locking platforms 22 are provided at intervals along the axial direction on the inner side of the second cylinder body 2, the locking platforms 22 have a first locking surface, the piston rod 3 is provided with a locking member, the locking member is provided with a second locking surface adapted to the first locking surface, and the locking member and the locking platform 22 form a self-locking structure.

[0025] Specifically, the displacement space refers to the cavity provided in both the first cylinder body 1 and the second cylinder body 2 for the piston rod 3 to move. When the piston rod 3 reaches the designated position and needs to be self-locked, the second locking surface of the piston rod 3 contacts the first locking surface of the locking platform 22 at the corresponding position to form self-locking. The multiple locking platforms 22 arranged at intervals along the axial direction enable the piston rod 3 to form self-locking at different positions. In addition, during use, the locking platform 22 (except the locking platform 22 at the bottom) forming the self-locking structure can provide insurance. When an accident occurs and the self-locking structure fails, the locking member can also form a self-locking structure with the locking platform 22 at the bottom to prevent the goods from falling directly to the bottom and causing greater economic losses.

[0026] Furthermore, the locking member includes a sleeve 32, a spring steel sheet 33 circumferentially spaced on the sleeve 32, a second locking surface arranged on the side of the spring steel sheet 33 away from the sleeve 32, and an electromagnet 35 is arranged on the piston rod 3. After the locking member moves to the specified position, the spring steel sheet 33 opens, and the second locking surface of the spring steel sheet 33 forms a self-locking structure with the first locking surface of the locking platform 22 at the corresponding position. When unlocking is required, the end of the electromagnet 35 close to the spring steel sheet 33 generates an attractive force on the spring steel sheet 33, driving the spring steel sheet 33 to deform to release the self-locking. It can be understood that when releasing or forming the self-locking structure, the piston rod 3 moves an end distance in the axial direction to provide deformation space for the spring steel sheet 33. The structure of the electromagnet 35 can be of many kinds, as long as it can achieve the effect of generating attraction to the spring steel sheet 33 to achieve self-locking contact. An electromagnet 35 is provided here, which includes a hollow iron core and a coil wound around the outside of the hollow iron core. The coil is energized to generate a magnetic field, and a barrier layer is provided between the hollow iron core and the piston rod 3.

[0027] Furthermore, the outer peripheral surface of the piston rod 3 is provided with an external thread, and the sleeve 32 and / or the electromagnet 35 are provided with an internal thread adapted to the external thread; the sleeve 32 and / or the electromagnet 35 are both threadedly connected to the outer side of the piston rod 3 .

[0028] And / or, the spring steel sheet 33 is provided with a receiving groove along the circumferential direction, and a reinforcing member 34 is arranged in the receiving groove. The reinforcing member 34 is magnetic and strengthens the adsorption force of the electromagnet 35 on the spring steel sheet 33 after being energized.

[0029] Furthermore, the piston rod 3 is provided with a boss 31, and a side of the boss 31 facing the sleeve 32 is provided with an anti-slip pattern. The boss 31 is used to position the sleeve 32, and the boss 31 can lock the sleeve 32 through the friction between the boss 31 and the sleeve 32 to prevent the sleeve 32 from loosening and shifting.

[0030] Furthermore, the first cylinder body 1 is provided with a first oil inlet hole 12, the second cylinder body 2 is provided with a second oil inlet hole 21, and the first cylinder body 1 is provided with a wiring hole 13; and / or, the first cylinder body 1 is provided with a guide cylinder 11, and the guide cylinder 11 guides the piston rod 3, so as to enhance the stability of the piston rod 3 when outputting power.

[0031] Furthermore, a fastener is provided between the first cylinder body 1 and the second cylinder body 2; the fastener comprises a fastening bolt 41 and a nut 42 matched with the fastening bolt 41, and preferably the nut 42 also has a gasket matched with it.

[0032] The above-mentioned technical features can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A self-locking hydraulic cylinder, characterized in that: It comprises a piston rod (3), a first cylinder body (1), and a second cylinder body (2) connected to the first cylinder body (1), wherein the first cylinder body (1) and the second cylinder body (2) are both provided with a displacement space for the piston rod (3) to reciprocate along the axial direction; A plurality of locking platforms (22) are arranged at intervals along the axial direction on the inner side of the second cylinder body (2), the locking platform (22) having a first locking surface, the piston rod (3) having a locking member, the locking member having a second locking surface adapted to the first locking surface, the locking member and the locking platform (22) forming a self-locking structure.

2. A self-locking hydraulic cylinder according to claim 1, characterized in that: The locking member comprises a sleeve (32), a spring steel sheet (33) arranged on the sleeve (32) at intervals along the circumferential direction, the second locking surface is arranged on a side of the spring steel sheet (33) away from the sleeve (32), and an electromagnet (35) is arranged on the piston rod (3).

3. A self-locking hydraulic cylinder according to claim 2, characterized in that: The outer peripheral surface of the piston rod (3) is provided with an external thread, and the sleeve (32) and / or the electromagnet (35) are provided with an internal thread adapted to the external thread; And / or, the spring steel sheet (33) is provided with a receiving groove along the circumferential direction, and a reinforcing member (34) is arranged in the receiving groove.

4. A self-locking hydraulic cylinder according to claim 3, characterized in that: The piston rod (3) is provided with a boss (31), and a side of the boss (31) facing the sleeve (32) is provided with anti-slip patterns.

5. The self-locking hydraulic cylinder according to claim 1, characterized in that: The first cylinder body (1) is provided with a first oil inlet hole (12), the second cylinder body (2) is provided with a second oil inlet hole (21), and the first cylinder body (1) is provided with a wiring hole (13); And / or, the first cylinder body (1) is provided with a guide cylinder (11).

6. A self-locking hydraulic cylinder according to claim 1, characterized in that: A fastener is provided between the first cylinder body (1) and the second cylinder body (2); The fastener comprises a fastening bolt (41) and a nut (42) adapted to the fastening bolt (41).

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