Locking oil cylinder

Abstract

The utility model discloses a locking oil cylinder which comprises a cylinder body, a piston rod assembly is arranged in the cylinder body, the tail end of the piston rod assembly is connected with a nut in a threaded mode, a locking piece is embedded between the nut and the piston rod assembly, an elastic clamping jaw is arranged on the locking piece, a protruding portion matched with the elastic clamping jaw is arranged in the cylinder body, and the elastic clamping jaw is arranged on the protruding portion. The protruding part tightly presses the elastic clamping jaw, and the piston rod assembly is locked through the elastic force of the elastic clamping jaw. By means of the mode, the locking oil cylinder achieves locking through the elastic clamping jaw, and is simple in structure, low in cost, small in occupied space and suitable for a compact oil cylinder structure.

Description

Technical Field

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

[0002] As a commonly used actuator in engineering equipment, oil cylinders often need to be locked during operation. For example, underwater oil cylinders require a rear locking structure to overcome the thrust on the piston rod caused by water pressure and prevent the oil cylinder from accidentally extending.

[0003] At present, the locking cylinder usually adopts the steel ball locking structure. Figure 4 As shown in the figure, the principle of this locking scheme is to use the steel ball and the steel ball slot on the piston rod for locking, rely on oil pressure to lock and unlock, and the locking mechanism relies on the spring to reset. Although this classic locking structure is reliable and versatile, it is complex in structure, high in cost, and occupies a large space. Therefore, it is not suitable for compact oil cylinders. For some working conditions that do not require high locking force, it is too complicated and has low cost performance. Summary of the invention

[0004] The main technical problem solved by the utility model is to provide a locking oil cylinder, which realizes locking through elastic claws, has a simple structure, low cost, occupies little space, and is suitable for a compact oil cylinder structure.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a locking cylinder, including a cylinder body, a piston rod assembly is arranged in the cylinder body, a nut is threadedly connected to the end of the piston rod assembly, a locking piece is embedded between the nut and the piston rod assembly, the locking piece has an elastic claw, and the cylinder body has a protrusion that cooperates with the elastic claw, the protrusion presses the elastic claw, and the elastic force of the elastic claw is used to lock the piston rod assembly.

[0006] In a preferred embodiment of the present invention, the outer edge of the elastic claw is pressed by the protrusion to provide elastic force.

[0007] In a preferred embodiment of the present invention, the locking member is an annular structure, and the elastic claws are evenly distributed in the circumferential direction of the locking member.

[0008] In a preferred embodiment of the present invention, the cross section of the elastic claw is V-shaped.

[0009] In a preferred embodiment of the present invention, a mounting groove is formed between the nut and the piston rod assembly, and the locking member is embedded in the mounting groove.

[0010] In a preferred embodiment of the present invention, the nut is threadedly connected to the piston of the piston rod assembly, and the piston and the nut have circumferentially extending bosses, and mounting grooves are formed between the bosses.

[0011] In a preferred embodiment of the present invention, the nut is threadedly connected to the piston rod of the piston rod assembly, and the piston rod and the nut have circumferentially extending bosses, and mounting grooves are formed between the bosses.

[0012] In a preferred embodiment of the present invention, the cylinder body enters oil to push the piston, so that the oil pressure overcomes the elastic force to unlock the piston rod assembly.

[0013] The beneficial effect of the utility model is that the locking oil cylinder of the utility model applies locking force to the piston rod assembly by elastic force through the elastic claws of the locking piece cooperating with the protruding part, thereby avoiding displacement of the piston rod when there is no oil pressure.

[0014] The utility model locks the oil cylinder, and the locking piece is positioned and installed through the nut and the piston rod assembly, the installation structure is simple, and the space occupied is small, and it is suitable for working conditions with low locking force requirements and oil cylinders with compact structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0016] Figure 1 This is a structural schematic diagram of a preferred embodiment of the locking oil cylinder of the utility model;

[0017] Figure 2 yes Figure 1 Schematic diagram of the local structure;

[0018] Figure 3 is a schematic diagram of the structure of the locking member;

[0019] Figure 4 It is a schematic diagram of the locking structure of the existing oil cylinder;

[0020] The components in the accompanying drawings are marked as follows: 1. cylinder body, 11. raised portion, 2. piston, 3. piston rod, 4. nut, 5. locking piece, 51. elastic claw. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiment of the utility model will be described clearly and completely below. The structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions that can be implemented in the utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that can be produced by the utility model and the purpose that can be achieved, should still fall within the scope of the technical content disclosed in the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of narration, and are not used to limit the scope that can be implemented. The change or adjustment of its relative relationship should also be regarded as the scope that can be implemented in the utility model without substantially changing the technical content.

[0022] See also Figures 1 to 3 A locking oil cylinder includes a cylinder body 1, in which a piston rod assembly is arranged. The piston rod assembly includes a piston 2 and a piston rod 3. The rod chamber and the rodless chamber of the cylinder body 1 are filled with oil to push the piston rod assembly to move back and forth. The remaining conventional structures of the oil cylinder are not described in detail.

[0023] The end of the piston rod assembly is threadedly connected with a nut 4, and a locking member 5 is embedded between the nut 4 and the piston rod assembly. Preferably, the nut 4 is threadedly connected to the piston 2 of the piston rod assembly, and the piston 2 and the nut 4 have circumferentially extending bosses, and a mounting groove is formed between the bosses. The locking member 5 is embedded in the mounting groove.

[0024] The locking member 5 has an elastic claw 51. The cylinder body 1 has a protrusion 11 that cooperates with the elastic claw 51. The protrusion 11 presses the elastic claw 51, and the piston rod assembly is locked by the elastic force of the elastic claw 51. Preferably, the protrusion 11 is arranged on the cylinder bottom of the cylinder body 1, and the outer diameter of the nut 4 is smaller than the inner diameter of the narrowest part of the protrusion 11, so that the nut 4 can follow the piston rod 3 to move through the protrusion 11.

[0025] The locking member 5 is an annular structure, and the elastic claws 51 are evenly spaced and distributed around the locking member 5. The cross section of the elastic claw 51 is V-shaped. The outer edge of the elastic claw 51 is pressed by the protrusion 11 to provide elastic force. When no hydraulic oil enters the cylinder body 1, such as when the cylinder is in a vertical state or in water, the piston rod 3 moves to the right under the action of external force. At this time, the elastic claw 51 will be in contact with the protrusion 11. The elastic claw 51 is deformed by the pressure of the protrusion 11 and generates elastic force. Due to the action of the elastic force, the friction between the elastic claw 51 and the protrusion 11 increases, preventing the piston rod 3 from moving further, thereby achieving the locking of the piston rod 3.

[0026] When the oil is introduced, the oil pushes the piston 2, and the oil pressure acts on the piston 2. The thrust provided by the oil pressure is greater than the friction force. This is because the oil pressure overcomes the elastic force to unlock the piston rod assembly, and the piston rod 3 can be extended. The piston rod 3 drives the locking member 5 to pass through the protrusion 11. The same applies when the piston 2 is retracted.

[0027] In Example 2, the installation position of the piston 2 on the piston rod 3 can be changed. The piston 2 can be installed on the middle part of the piston rod 3, a boss is provided on the left side of the piston rod 3, and a mounting groove is formed by the nut 4 and the piston rod 3. Similarly, the raised portion 11 can also be adjusted to the position of the cylinder body 1. The structure of the piston rod 3 and the piston and the position of the raised portion 11 can be combined as needed and are not limited to the above structure.

[0028] Different from the prior art, the locking oil cylinder of the utility model realizes locking through elastic claws, has a simple structure, low cost, occupies little space, and is suitable for a compact oil cylinder structure.

[0029] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A locking oil cylinder, comprising a cylinder body (1), wherein a piston rod assembly is arranged in the cylinder body (1), characterized in that: A nut (4) is threadedly connected to the end of the piston rod assembly, a locking piece (5) is embedded between the nut (4) and the piston rod assembly, the locking piece (5) has an elastic claw, the cylinder body (1) has a protrusion (11) that cooperates with the elastic claw (51), the protrusion (11) presses the elastic claw (51), and the piston rod assembly is locked by the elastic force of the elastic claw (51).

2. The locking cylinder according to claim 1, characterized in that: The outer edge of the elastic claw (51) is pressed by the protruding portion (11) to provide elastic force.

3. The locking cylinder according to claim 2, characterized in that: The locking piece (5) is an annular structure, and the elastic claws (51) are evenly distributed in the circumferential direction of the locking piece (5).

4. The locking cylinder according to claim 3, characterized in that: The cross section of the elastic claw (51) is V-shaped.

5. The locking cylinder according to claim 4, characterized in that: A mounting groove is formed between the nut (4) and the piston rod assembly, and the locking member (5) is embedded in the mounting groove.

6. The locking cylinder according to claim 5, characterized in that: The nut (4) is threadedly connected to the piston (2) of the piston rod assembly; the piston (2) and the nut (4) have circumferentially extending bosses, and mounting grooves are formed between the bosses.

7. The locking cylinder according to claim 5, characterized in that: The nut (4) is threadedly connected to the piston rod (3) of the piston rod assembly; the piston rod (3) and the nut (4) have circumferentially extending bosses, and mounting grooves are formed between the bosses.

8. The locking cylinder according to any one of claims 1 to 7, characterized in that: The cylinder body (1) is supplied with oil to push the piston (2), so that the oil pressure overcomes the elastic force to unlock the piston rod assembly.

Images