Brake device for tensioning oil cylinder

Abstract

The utility model discloses a brake device for a tensioning oil cylinder, and belongs to the technical field of brake equipment. The brake device comprises a cylinder body, a piston, a brake ball, a brake cylinder and an elastic piece, a piston rod penetrates through the cylinder; the piston, the brake cylinder and the elastic piece are all arranged in the cylinder body, the bottom of the elastic piece is connected with the cylinder body, the brake cylinder is arranged above the elastic piece, and the piston is arranged above the brake cylinder; the brake ball can abut against the inner wall of the brake cylinder and the outer wall of the piston rod. A sealing cavity is formed between the cylinder body and the piston; and an oil inlet nozzle communicated with the sealing cavity is arranged on the cylinder wall of the cylinder body. The brake device opens the brake by using the pressure of hydraulic oil and holds the brake by using the restoring force of the elastic piece, so that the stability of the telescopic state of the piston rod is improved; and the brake opening or contracting time can be flexibly adjusted according to the change speed of the oil pressure. The utility model belongs to a normally closed brake structure, and meets the mechanical safety performance requirements of products.

Description

Technical Field

[0001] The utility model relates to the technical field of braking equipment, and particularly relates to a braking device for a tensioning oil cylinder. Background Technique

[0002] At present, tensioning oil cylinders have been widely used in fields such as mines, metallurgy, chemical industry, and electric power. The core components of a tensioning oil cylinder are the oil cylinder and the piston. By controlling the inflow and outflow of hydraulic oil, the position of the piston is adjusted, thereby achieving the control of the tensioning force. Compared with other transmission control devices, the tensioning oil cylinder has the advantages of fast response speed, high precision, and long service life.

[0003] Generally, under the pressure of hydraulic oil, the piston rod of the tensioning oil cylinder is in an extended or retracted state. Due to reasons such as the floating of the oil pressure of the hydraulic oil supply unit or the change of the oil pressure caused by the leakage of hydraulic oil, the telescopic state of the piston rod will be unstable. However, in some mechanical working processes, it is necessary to ensure that the piston rod is in a stable telescopic state; otherwise, accidents may occur, resulting in property losses or casualties. For example, during the working process of a lift, sometimes it is required that the lift stays at a certain height for continuous operation. At this time, if the telescopic state of the piston rod is unstable, the lift cannot stay stably at a certain height, thus leading to the occurrence of safety accidents.

[0004] Therefore, it is necessary to propose a braking device to solve the above-mentioned technical problems existing in the prior art. Content of the Utility Model

[0005] The purpose of the utility model is to provide a braking device for a tensioning oil cylinder to solve the problem of inaccurate position of the piston rod caused by reasons such as oil pressure floating.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A braking device for a tensioning oil cylinder includes a cylinder body, a piston, a braking ball, a braking cylinder, and an elastic member;

[0008] The piston rod passes through the middle of the cylinder body;

[0009] The piston, the braking cylinder, and the elastic member are all arranged inside the cylinder body, and the bottom of the elastic member is connected to the cylinder body. The braking cylinder is arranged above the elastic member, and the piston is arranged above the braking cylinder;

[0010] The braking ball can abut against the inner wall of the braking cylinder and the outer wall of the piston rod;

[0011] A sealing cavity is formed between the cylinder body and the piston;

[0012] An oil inlet nozzle communicating with the sealing cavity is arranged on the cylinder wall of the cylinder body.

[0013] Preferably, a plurality of the braking balls are arranged around the piston rod.

[0014] Preferably, both the piston and the braking cylinder can move along the axial direction of the cylinder body.

[0015] Preferably, the piston is in sliding fit with the inner wall of the cylinder body.

[0016] Preferably, the inner wall profile of the braking cylinder is wider at the top and narrower at the bottom.

[0017] Preferably, the inner wall profile of the braking cylinder is frustum-shaped.

[0018] Preferably, the cylinder body includes a cylinder head and a cylinder block, and the cylinder head is assembled on the top of the cylinder block.

[0019] Preferably, a hydraulic oil supply unit is further included, and the hydraulic oil supply unit is communicated with the oil inlet nozzle.

[0020] Preferably, the bottom of the cylinder body is a flange structure.

[0021] Preferably, the elastic member is a disc spring.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] As described above, a braking device for a tensioning oil cylinder described in the utility model is a wrapped mechanical structure, which uses the pressure of hydraulic oil to open the brake and the restoring force of the elastic member to apply the brake, ensuring the accuracy of the piston rod position. At the same time, the length of the brake opening or closing time of the utility model can be flexibly adjusted according to the speed of the oil pressure change; when the oil pressure changes quickly, the brake opening or closing time is short; when the oil pressure changes slowly, the brake opening or closing time is long. The utility model belongs to a normally closed braking structure, meets the requirements of the mechanical safety performance of the product, and can be widely applied to the braking of other rod-shaped mechanical devices. Description of the Drawings

[0024] Figure 1 is a schematic structural diagram of a braking device for a tensioning oil cylinder in Embodiment 1;

[0025] Figure 2 is Figure 1 a cross-sectional structural diagram taken along the A-A direction in

[0026] In the figure: 1 - piston rod, 2 - cylinder head, 3 - bolt, 4 - oil inlet nozzle, 5 - cylinder block, 6 - piston, 7 - braking ball, 8 - braking cylinder, 9 - disc spring. Detailed Embodiments

[0027] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments.

[0028] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0030] In addition, the descriptions such as "first" and "second" in the present utility model are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, "a plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0031] In the present utility model, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] In addition, the technical solutions between the various embodiments of the present utility model can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement it. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present utility model.

[0033] Embodiment 1

[0034] As Figure 1 and Figure 2 shown, this embodiment describes a braking device for a tensioning oil cylinder. The braking device includes a cylinder body, a piston 6, a braking ball 7, a braking cylinder 8, and an elastic member 9; among them, the elastic member 9 is a disc spring.

[0035] The cylinder body includes a cylinder head 2 and a cylinder block 5. The cylinder head 2 is fixed to the top of the cylinder block 5 by bolts 3, and a piston rod 1 passes through the middle of the cylinder head 2 and the cylinder block 5.

[0036] A piston 6, a brake cylinder 8 and a disc spring are all arranged inside the cylinder block 5. The bottom of the disc spring is connected to the cylinder block 5, the brake cylinder 8 is arranged above the disc spring, the inner wall profile of the brake cylinder 8 is a frustum of a cone with a wider upper part and a narrower lower part, and the piston 6 is arranged above the brake cylinder 8. The piston 6, the brake cylinder 8 and the disc spring can all move along the axial direction of the cylinder block 5. Among them, the piston 6, the brake cylinder 8 and the disc spring are all in sliding fit with the inner wall of the cylinder block 5, and the piston 6 is also in sliding fit with the inner wall of the cylinder head 2.

[0037] A sealing cavity is formed between the cylinder head 2, the cylinder block 5 and the piston 6. An oil inlet nozzle 4 is arranged on the cylinder wall of the cylinder block 5. The oil inlet nozzle 4 communicates with a hydraulic oil supply unit and the sealing cavity, and the hydraulic oil supply unit can inject hydraulic oil into the sealing cavity through the oil inlet nozzle 4.

[0038] A cavity is formed between the piston 6, the brake cylinder 8 and the piston rod 1. A brake ball 7 is arranged in the cavity, and there are multiple brake balls 7, and the multiple brake balls 7 are arranged in a circle around the piston rod 1.

[0039] In this embodiment, the bottom of the cylinder block 5 is set as a flange structure, which is convenient for fixing the cylinder block 5 on a base or a frame.

[0040] The working process of a braking device for a tensioning oil cylinder in this embodiment is briefly described as follows:

[0041] (1) Fix the cylinder body on the base or the frame through bolts 3 and the flange structure at the bottom of the cylinder body;

[0042] (2) The hydraulic oil supply unit is communicated with the oil inlet nozzle 4 arranged on the cylinder wall, and the hydraulic oil supply unit injects hydraulic oil into the sealing cavity through the oil inlet nozzle 4;

[0043] (3) As the pressure of the hydraulic oil gradually increases, the piston 6 and the brake cylinder 8 move downward along the axial direction of the cylinder body under the action of the hydraulic oil pressure, so that the disc spring is in a compressed state, and the brake balls 7 can move freely, realizing the function of opening the brake;

[0044] (4) When the hydraulic oil pressure decreases, under the action of the restoring force of the disc spring, the brake cylinder 8 and the piston 6 move upward along the axial direction of the cylinder body; due to the inner wall profile of the brake cylinder 8 being a frustum of a cone with a wider upper part and a narrower lower part, as the brake cylinder 8 moves upward, the brake balls 7 will hold the piston rod 1 tightly under the extrusion of the brake cylinder 8, realizing the function of braking.

[0045] So far, the present embodiment has been described in detail with reference to the accompanying drawings. Based on the above description, those skilled in the art should have a clear understanding of the braking device for the tensioning cylinder of the present utility model. The present utility model fixes the cylinder block 5 on the base or the frame, and the hydraulic oil supply unit injects hydraulic oil into the sealing cavity of the cylinder block 5. When the pressure of the hydraulic oil increases, the hydraulic oil pushes the piston 6 downward, and the piston 6 pushes the brake cylinder 8 to move, making the disc spring in a compressed state; at this time, the moving space of the brake ball 7 becomes larger and it can move freely, thereby realizing the function of opening the brake. When the pressure of the hydraulic oil decreases, the restoring force of the disc spring pushes the brake cylinder 8 and the piston 6 upward, making the moving space of the brake ball 7 smaller; at this time, under the extrusion of the brake cylinder 8, the brake ball 7 fixes the piston rod 1, realizing the function of braking. The length of the time for opening or braking the brake can be flexibly adjusted according to the speed of the hydraulic oil pressure change of the hydraulic oil supply unit; when the hydraulic oil pressure changes quickly, the time for opening or braking the brake is short; when the hydraulic oil pressure changes slowly, the time for opening or braking the brake is long.

[0046] The embodiments of the present utility model are only used to illustrate the technical solutions of the present utility model rather than to limit them. For those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A braking device for a tensioning cylinder, characterized in that: It includes a cylinder body, a piston, a brake ball, a brake cylinder and an elastic member; A piston rod penetrates through the middle of the cylinder body; The piston, the brake cylinder and the elastic member are all arranged inside the cylinder body, and the bottom of the elastic member is connected to the cylinder body. The brake cylinder is arranged above the elastic member, and the piston is arranged above the brake cylinder; The brake ball can abut against the inner wall of the brake cylinder and the outer wall of the piston rod; A sealing cavity is formed between the cylinder body and the piston; An oil inlet nozzle communicating with the sealing cavity is arranged on the cylinder wall of the cylinder body.

2. A braking device for a tensioning oil cylinder according to claim 1, characterized in that: A plurality of the brake balls are arranged around the piston rod.

3. A braking device for a tensioning oil cylinder according to claim 1, characterized in that: Both the piston and the brake cylinder can move along the axial direction of the cylinder body.

4. The braking device for a tensioning oil cylinder according to claim 1, characterized in that: The piston is in sliding fit with the inner wall of the cylinder body.

5. A braking device for a tensioning oil cylinder according to claim 3, characterized in that: The inner wall contour of the brake cylinder is wider at the top and narrower at the bottom.

6. A braking device for a tensioning oil cylinder according to claim 5, characterized in that: The inner wall contour of the brake cylinder is frustum-shaped.

7. A braking device for a tensioning oil cylinder according to claim 1, characterized in that: The cylinder body includes a cylinder head and a cylinder block, and the cylinder head is assembled on the top of the cylinder block.

8. A braking device for a tensioning oil cylinder according to claim 1, characterized in that: It further includes a hydraulic oil supply unit which communicates with the oil inlet nozzle.

9. A braking device for a tensioning oil cylinder according to claim 1, characterized in that: The bottom of the cylinder body is of a flange structure.

10. A braking device for a tensioning oil cylinder according to claim 1, characterized in that: The elastic member is a disc spring.

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