Oil cavity expansion ring based on force closed type hydraulic clamping mechanism

Abstract

The utility model discloses an oil cavity expansion ring based on a force closed type hydraulic clamping mechanism, which comprises a main ring, side rings and clamping rings, the main ring, the side rings and the clamping rings are coaxially arranged, the side rings and the clamping rings are arranged in pairs and are symmetrically distributed on the two sides of the main ring, the inner sides of the side rings are fixedly connected with the outer sides of the clamping rings and the main ring in a sealing manner, and the main ring is fixedly connected with the side rings. An annular groove is defined by the pair of clamping rings on the inner side of the main ring, and spacing distances are reserved between the pair of side rings and the main ring so that annular oil cavities symmetrically located on the two sides of the main ring can be defined. The oil cavity expansion ring can be used for a hydraulic clamping mechanism, so that the hydraulic clamping mechanism cannot influence the precision of a clamped part, and the sealing part of the oil cavity expansion ring is in static sealing, so that the sealing capability is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic clamping spare part technical field, concretely is a kind of oil cavity expansion ring based on force closed type hydraulic clamping mechanism. BACKGROUND

[0002] Hydraulic clamping has the advantages such as large clamping torque, reliable clamping force, and is widely used on single-rotation worktable, double-axis rotary table and various swing heads of numerical control machine tool.

[0003] The commonly used hydraulic clamping is basically one-way stress currently, cannot constitute force closure, so there is additional force on the clamped part at the moment of clamping, resulting in the change of the precision of the clamped part.

[0004] In addition, since oil cylinder is used for driving, more oil is needed for driving, and the reaction is relatively slow, and the frequent movement of piston in cylinder body also easily causes dynamic seal failure, resulting in pressure oil leakage, and further affecting use, and even polluting other components.

[0005] Therefore, the inventor focuses on developing a hydraulic clamping mechanism with force closure characteristics to solve the above problems. In the development process, the inventor adopts the following concept scheme: a friction ring and an oil cavity expansion ring are arranged, and the oil cavity expansion ring can act on the friction ring to clamp and fix it after injecting high-pressure hydraulic oil. If the friction ring can be connected to the part to be clamped, such as the swing shaft, the movement of the friction ring is limited, and the swing shaft is also limited, so that clamping is achieved.

[0006] In the above concept scheme, the oil cavity expansion ring is the core component of the hydraulic clamping mechanism, and how to construct the specific structure of the oil cavity expansion ring to balance the force on the friction ring and offset it inside the oil cavity expansion ring, so that the hydraulic clamping mechanism has the force closure characteristic, is an important problem that the inventor needs to overcome in the development process. CONTENT OF THE UTILITY MODEL

[0007] The utility model aims at providing an oil cavity expansion ring based on force closed type hydraulic clamping mechanism to solve the problems that the precision of the clamped part changes and dynamic seal is easily lost due to one-way stress of the existing hydraulic clamping mechanism, and hydraulic oil is easily leaked.

[0008] The utility model provides the following technical scheme: an oil cavity expansion ring based on force closed type hydraulic clamping mechanism, comprising a main ring, a side ring and a clamping ring, wherein the main ring, the side ring and the clamping ring are coaxially arranged, the side ring and the clamping ring are arranged in pairs, and are symmetrically distributed on both sides of the main ring, the inner side of the side ring and the outer side of the clamping ring are connected with the main ring in a sealed manner, a pair of clamping rings define a ring-shaped groove on the inner side of the main ring, and a pair of side rings and the main ring are spaced apart to define a pair of ring-shaped oil cavities symmetrically located on both sides of the main ring.

[0009] Preferably, the main ring, the side ring and the clamping ring are integrally formed into an integral structure, which is a spring steel structure, so that the annular oil cavity has the characteristics of expansion and resilience.

[0010] Preferably, the difference between the inner and outer diameters of the side ring is greater than the difference between the inner and outer diameters of the clamping ring, so that the force arm of the clamping ring is shorter and the force arm of the side ring is longer, thus playing a force amplification role.

[0011] Preferably, the wall of the clamping ring away from the annular groove forms an inclined wall, so that the thickness of the clamping ring is slightly less than the thickness of the side ring.

[0012] Preferably, the inner side of the annular oil cavity forms a closed arc-shaped wall, and the outer side of the annular oil cavity forms an opening.

[0013] Preferably, the main ring continues to extend outward from the opening of the annular oil cavity to form a mounting section.

[0014] Preferably, the outer sides of the pair of side rings are each provided with a sealing ring I, and the two sides of the mounting section of the main ring are each provided with a sealing ring II.

[0015] Compared with the prior art, the oil cavity expansion ring has the following beneficial effects:

[0016] The oil cavity expansion ring of the utility model, through the main ring can be mounted and connected to the fixed carrier part of the hydraulic clamping mechanism, and the oil cavity expansion ring has the annular oil cavities symmetrically located on both sides of the main ring, if a friction ring is arranged in the annular groove, the annular oil cavities are expanded by injecting oil into the annular oil cavities to drive the side rings to swing outward, the side rings drive the clamping rings to swing inward to clamp and fix the friction ring in the annular groove, the annular oil cavities, the side rings and the clamping rings are arranged around the friction ring and symmetrically arranged on both sides of the main ring, so that the forces acting on the friction ring are balanced, the internal forces of the clamping rings are offset, and the external force is zero, so that the friction ring is not subjected to additional force at the moment of clamping the friction ring, thereby playing a force sealing role, forming a force sealing structure, and the position precision of the friction ring does not change, thereby ensuring the machining precision of the numerical control machine tool.

[0017] When the main ring is mounted and connected to the fixed carrier part of the hydraulic clamping mechanism, the annular oil cavity can be sealed by the sealing ring I and the sealing ring II, the volume of the annular oil cavity is small, the expansion amount is small, and the deformation amount of the side ring is small, which is beneficial to reducing the energy consumption of the hydraulic system and improving the response speed, and in addition, the sealing ring I and the sealing ring II themselves have a certain elasticity, so that the small deformation amount of the side ring makes the sealing ring I and the sealing ring II almost in a static sealing state, the sealing effect is much better than that of dynamic sealing, the sealing performance is good, and the hydraulic oil is not easy to leak. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1is the structural schematic view of the oil cavity expansion ring for the hydraulic clamping mechanism of the utility model;

[0019] Figure 2 is the front view of the oil cavity expansion ring for the hydraulic clamping mechanism of the utility model;

[0020] Figure 3 is Figure 2 A-A sectional view in the middle of;

[0021] Figure 4 is the rear view of the oil cavity expansion ring for the hydraulic clamping mechanism of the utility model;

[0022] Figure 5 is Figure 4 B-B sectional view in the middle of;

[0023] Figure 6 is the three-dimensional structural schematic view of the oil cavity expansion ring after being cut off of the utility model.

[0024] In the figure:

[0025] 1, expansion ring; 11, main ring; 111, installation section; 12, side ring; 13, annular oil cavity; 131, arc wall; 132, opening; 14, clamping ring; 141, inclined wall; 15, annular groove; 16, communication hole one;

[0026] 2, fixed ring one; 21, communication groove;

[0027] 3, fixed ring two; 32, communication hole two; 33, plug;

[0028] 4, sealing ring one; 5, sealing ring two; 6, installation hole one;

[0029] 7, friction ring; 71, installation hole two;

[0030] 8, oil inlet hole; 9, oil outlet hole. DETAILED DESCRIPTION

[0031] The technical scheme in the specific embodiment of the utility model will be described clearly in combination with the drawings, obviously, the described embodiment is a part of the embodiment of the application, rather than all the embodiment. All other embodiments obtained by the person skilled in the art based on the following embodiment are within the scope of the utility model.

[0032] The terms "one", "two", etc. following the names of components in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by the terms "one", "two", etc. following the names of components are generally of a kind and are not limited in number, for example, the object of the term "one" can be one or more.

[0033] Specifically, the detailed structure of the oil bag of the present application is described in detail below in Embodiment One.

[0034] Embodiment One

[0035] With reference to Figures 1-6 , the utility model provides a kind of oil cavity expansion ring 1, the oil cavity expansion ring 1 is configured to annular body, the oil cavity expansion ring 1 includes main ring 11, side ring 12, clamp ring 14, the main ring 11, side ring 12, clamp ring 14 are coaxially arranged, the side ring 12 and clamp ring 14 are arranged in pairs, and are symmetrically distributed on the two sides of main ring 11, the inner side (the inner side refers to inner circumferential surface, outer side refers to outer circumferential surface, same below) of side ring 12 and the outer side of clamp ring 14, the one side side of main ring 11 inner side are sealingly fixedly connected, preferably the main ring 11, side ring 12, clamp ring 14 are integrally formed, design like this, it is convenient for expansion ring 1 production and manufacture, reduce production cost, and ring-shaped oil cavity 13 can have good sealing performance again.It needs to be explained that the expansion ring 1 integrally formed in the embodiment is made of spring steel, and the ring-shaped oil cavity 13 has expansion and resilience after being injected with hydraulic oil.

[0036] In the embodiment, as shown in Figure 3 , Figure 5 , Figure 6 A pair of clamp rings 14 define a ring-shaped groove 15 on the inner side of main ring 11, and the ring-shaped groove 15 can be used to install the friction ring 7. There is a spacing distance between the side ring 12 and the main ring 11. After the fixed ring is sealingly connected with the side ring 12 and the main ring 11, a ring-shaped oil cavity 13 can be defined between the side ring 12 and the main ring 11, and the ring-shaped oil cavity 13 is also arranged in pairs and symmetrically distributed on the two sides of the main ring 11.

[0037] In the force arm structure composed of the side ring 12 and the clamp ring 14, the difference between the inner and outer diameters of the side ring 12 is greater than the difference between the inner and outer diameters of the clamp ring 14, so that the force arm of the clamp ring 14 is shorter and the force arm of the side ring 12 is longer, thus playing a force amplification role. A smaller hydraulic pressure is used to push the side ring 12 to swing, so that the clamp ring 14 can generate a large clamping force on the friction ring 7 to firmly clamp and fix the friction ring 7. The design of the force arm structure helps to reduce the energy consumption of the hydraulic system of the hydraulic clamping mechanism.

[0038] In the embodiment, the wall of the clamping ring 14 away from the annular groove 15 forms an inclined wall 141 so that the thickness of the clamping ring 14 is slightly less than the thickness of the side ring 12, which facilitates clamping of the friction ring 7 by the clamping ring 14 with smaller hydraulic pressure.

[0039] As an improvement, the inner side of the annular oil cavity 13 forms a closed arc-shaped wall 131, and the outer side of the annular oil cavity 13 forms an opening 132. The inner side of the annular oil cavity 13 of this structure is smooth and does not form turbulence, facilitating expansion and rebound, and the outer side of the annular oil cavity 13 forms an opening 132, which is easy to process and form the annular oil cavity 13.

[0040] The main ring 11 continues to extend outward from the opening of the annular oil cavity 13 to form a mounting section 111, and the mounting section 111 extending outward can realize mounting and connection of the oil cavity expansion ring 1 to the fixed carrier component of the hydraulic clamping mechanism.

[0041] At the same time, the outer sides of the pair of side rings 12 are provided with sealing rings one 4, and the mounting section 111 of the main ring 11 is also provided with sealing rings two 5 on both sides, and the sealing rings one 4 and the sealing rings two 5 are made of rubber, so that after the oil cavity expansion ring 1 is mounted and connected to the fixed carrier component of the hydraulic clamping mechanism, a closed annular oil cavity 13 can be defined between the main ring 11 and the side ring 12. In order to realize oil inlet and outlet of the closed annular oil cavity 13, two communication holes one 16 are provided on the main ring 11 in the embodiment, the annular oil cavities 13 on both sides of the main ring 11 are communicated through the communication holes one 16, and the two communication holes one 16 can be communicated with the oil inlet channel and the oil outlet channel respectively.

[0042] The oil cavity expansion ring 1 of the embodiment has a simple overall structure and can be made and formed, has two symmetrical annular oil cavities 13, and the annular oil cavities 13 have expansion capacity under the action of pressure oil and rebound characteristics after oil discharge, and the whole is suitable for the hydraulic clamping mechanism to make the hydraulic clamping mechanism have force sealing characteristics.

[0043] Embodiment Two

[0044] The oil cavity expansion ring 1 in the embodiment one is used for the specific embodiment of the hydraulic clamping mechanism.

[0045] Reference Figures 1-6 In the embodiment, the hydraulic clamping mechanism is designed to have a whole similar to a ring structure, including various ring-shaped components, such as the expansion ring 1, a pair of fixed rings, and the friction ring 7.

[0046] The pair of fixed rings are located on the outer sides of the pair of side rings 12, and the pair of fixed rings are respectively arranged on both sides of the main ring 11 and are detachably and sealingly fixedly connected with the main ring 11 and the side ring 12, for example Figure 3The sealing ring one 4 is clamped between the pair of fixed rings and the pair of side rings 12, and the sealing ring two 5 is clamped between the pair of fixed rings and the main ring 11. The sealing ring one 4 and the sealing ring two 5 are made of rubber, so as to define a closed annular oil cavity 13 between the main ring 11 and the side ring 12. The fixed ring is provided with the oil inlet hole 8 and the oil outlet hole 9 which communicate with the annular oil cavity 13. Specifically, as shown in the figure, Figure 3 The pair of fixed rings are respectively marked as the fixed ring one 2 and the fixed ring two 3, and the oil inlet hole 8 and the oil outlet hole 9 are arranged on the fixed ring two 3.

[0047] In the embodiment, as shown in the figure, Figure 3 The main ring 11 is provided with two communication holes one 16, the annular oil cavities 13 on both sides of the main ring 11 are communicated through the communication holes one 16, and the oil inlet hole 8 and the oil outlet hole 9 respectively communicate with one of the communication holes one 16.

[0048] In the embodiment, as shown in the figure, Figure 3 In order to facilitate the communication between the oil inlet hole 8, the oil outlet hole 9 and the annular oil cavity 13, the fixed ring two 3 is provided with a communication hole two 32, the oil inlet hole 8 and the oil outlet hole 9 communicate with the annular oil cavity 13 and the communication hole one 16 through the communication hole two 32 and the fixed ring two 3, and the design only needs to process the communication hole two 32 on the fixed ring two 3 to realize the communication between the oil inlet hole 8, the oil outlet hole 9, the annular oil cavity 13 and the communication hole one 16.

[0049] Further, in order to facilitate the processing of the communication hole two 32, the communication hole two 32 can be drilled from the outer circumferential surface of the fixed ring two 3, at this time, one end of the communication hole two 32 is located on the outer circumferential surface of the fixed ring two 3, and the end of the communication hole two 32 can be detachably sealed and plugged with a plug 33 to prevent oil leakage of the end of the communication hole two 32. The fixed ring one 2 is provided with a communication groove 21, and the annular oil cavity 13 defined by the fixed ring one 2 communicates with the communication hole one 16 through the communication groove 21.

[0050] In the embodiment, as shown in the figure, Figures 1-5 The friction ring 7 is movably installed in the annular groove 15, and the friction ring 7 can at least rotate in the annular groove 15.

[0051] The working principle of the hydraulic clamping mechanism in the embodiment is as follows: the annular oil cavity 13 is inflated by injecting hydraulic oil into the annular oil cavity 13 through the oil inlet hole 8, and the oil outlet hole 9 needs to be blocked after the air in the annular oil cavity 13 is discharged when the hydraulic oil is injected. The annular oil cavity 13 drives the side ring 12 to swing away from the main ring 11, as shown in the figure, Figure 3As shown by the arrow, the side ring 12 swings in the direction away from the main ring 11 to drive the clamping ring 14 to swing close to the friction ring 7 to clamp and fix the friction ring 7 in the annular groove 15. The annular oil cavity 13, the side ring 12 and the clamping ring 14 are arranged around the friction ring 7, so that the forces acting on the friction ring 7 are balanced with each other, are counteracted inside the clamping ring 14, and have no external force, so that no additional force acts on the friction ring 7 at the moment of clamping the friction ring 7, thereby playing a force-closing role, forming a force-closing structure, and the position accuracy of the friction ring 7 does not change, thereby ensuring the machining accuracy of the numerical control machine tool. Moreover, the annular oil cavity 13 is sealed by the sealing ring one 4 and the sealing ring two 5, the annular oil cavity 13 has a small volume and a small expansion amount, the side ring 12 has a small deformation amount, which is beneficial to reduce the energy consumption of the hydraulic system and improve the response speed. In addition, the sealing ring one 4 and the sealing ring two 5 themselves have a certain elasticity, so that the small deformation amount of the side ring 12 makes the sealing ring one 4 and the sealing ring two 5 almost in a static sealing state, the sealing effect is much better than that of dynamic sealing, the sealing performance is good, and the hydraulic oil is not easy to leak. Most importantly, the annular oil cavity 13 expands to clamp and fix the friction ring 7 by means of the force arm structure formed by the side ring 12 and the clamping ring 14, the hydraulic oil in the annular oil cavity 13 is removed, the side ring 12 and the clamping ring 14 are reset, and the clamping of the friction ring 7 is released. In the force arm structure formed by the side ring 12 and the clamping ring 14, the difference between the inner diameter and the outer diameter of the side ring 12 is greater than the difference between the inner diameter and the outer diameter of the clamping ring 14, that is, the force arm of the clamping ring 14 is shorter, and the force arm of the side ring 12 is longer, so that a force amplification effect is achieved. Therefore, a smaller hydraulic pressure is used to drive the side ring 12 to swing, so that a large clamping force is generated on the friction ring 7 by the clamping ring 14 to firmly clamp and fix the friction ring 7. The design of the force arm structure is beneficial to reduce the energy consumption of the hydraulic clamping mechanism.

[0052] The above description is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields based on the inventive concept of the present application and the content of the specification and drawings are included in the patent protection scope of the present application.

Claims

1. A force-closed hydraulic clamping mechanism based oil cavity expansion ring, characterized by: The main ring, the side ring and the clamp ring are coaxially arranged, the side ring and the clamp ring are arranged in pairs and symmetrically distributed on the two sides of the main ring, the inner side of the side ring and the outer side of the clamp ring are sealingly and fixedly connected with the main ring, a pair of clamp rings define a ring-shaped groove on the inner side of the main ring, and a pair of side rings and the main ring are spaced apart to define a ring-shaped oil cavity symmetrically located on the two sides of the main ring.

2. The force-closed hydraulic clamping mechanism based oil cavity expansion ring of claim 1, wherein: The main ring, the side ring and the clamp ring are integrally formed into an integrated structure, and the integrated structure is a spring steel structure.

3. The force-closed hydraulic clamping mechanism based oil cavity expansion ring of claim 2, wherein: The difference between the inner diameter and the outer diameter of the side ring is greater than the difference between the inner diameter and the outer diameter of the clamp ring.

4. The force-closed hydraulic clamping mechanism based oil cavity expansion ring of claim 3, wherein: The wall body of the clamp ring away from the ring-shaped groove forms an inclined wall, so that the thickness of the clamp ring is slightly less than the thickness of the side ring.

5. The force-closed hydraulic clamping mechanism based oil cavity expansion ring of claim 2, wherein: The inner side of the ring-shaped oil cavity forms a closed arc-shaped wall, and the outer side of the ring-shaped oil cavity forms an opening.

6. The force-closed hydraulic clamping mechanism based oil cavity expansion ring of claim 2, wherein: The main ring continues to extend outward from the opening of the ring-shaped oil cavity to form a mounting section.

7. The force-closed hydraulic clamping mechanism based oil cavity expansion ring of claim 6, wherein: The outer sides of the pair of side rings are provided with sealing rings one, and the two sides of the mounting section of the main ring are also provided with sealing rings two.

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