Normally-closed clamping device and clamp

Abstract

A normally-closed clamping device, comprising: a base body (100) having a working chamber (110); clamping members (200), each of which comprises a first driving end (210), a second driving end (220) and a clamping end (230) connected to one another, with the first driving end and the second driving end being located in a working chamber and the clamping end being configured for abutting against and fixing an object to be clamped, wherein each clamping member divides a working chamber into a first chamber (111) and a second chamber (112), the first driving end being close to the first chamber, and the second driving end being close to the second chamber; and adjusting members (300) mounted in the working chambers. The adjusting members, the first driving ends and the working chambers cooperate to form the first chambers, and the second driving ends and the working chambers cooperate to form the second chambers; the first chambers are configured for accommodating first working media (400), which are used for pushing the first driving ends to move, such that the clamping ends abut against said object; and the second chambers are configured for accommodating second working media, which are used for pushing the second driving ends to move, such that the clamping ends move away from said object. Further provided is a clamp using the normally-closed clamping device.

Description

Normally closed type clamping device and clamp Technical Field

[0001] This utility model relates to the field of clamping device technology, and in particular to a normally closed clamping device and clamping device. Background Technology

[0002] Clamping devices are high-performance functional components used in conjunction with rolling linear guide pairs. They are widely used in CNC machine tools, automated production lines, and other mechanical equipment requiring high precision and stability. Due to their powerful clamping force, clamping devices effectively prevent vibration during operation, enabling precise positioning. For example, in linear motor-driven machine tools, clamping devices can be used to fix the worktable, prevent vibration, and improve machining accuracy; in glass double-sided lathes, clamping devices can be used to hold glass plates, ensuring stability and safety during processing.

[0003] Currently, clamps on the market are generally divided into normally closed and normally open types. Normally closed clamps are particularly suitable for long-term clamping applications, while normally open clamps require a continuous flow of high-pressure oil, but cannot maintain pressure for extended periods when power is off. Existing hydraulic normally closed clamping methods either rely on bolt locking or wedge amplification followed by oil flow to open, resulting in complex structures and high manufacturing costs. Furthermore, after the workpiece is clamped for a period of time, the clamping force tends to weaken, leading to a decrease in workpiece accuracy during machining.

[0004] Furthermore, hydraulic clamps are too large for smaller installation spaces where installation space requirements are higher. When clamping and positioning require greater clamping force, the only way to increase clamping force is to use larger clamps or increase the number of clamps, leading to high production costs. Additionally, during workpiece processing, the clamping device needs to be repeatedly positioned. After multiple clamping and releasing cycles, deviations in the gap between the clamping device and the workpiece can easily occur, resulting in decreased machining accuracy and affecting product precision and quality.

[0005] Utility Model Content

[0006] This utility model aims to solve at least one of the technical problems existing in the prior art. To this end, this utility model proposes a normally closed clamping device and a clamping clamp. The clamping clamp utilizes this clamping device, which has a compact structure and small size, allowing for installation and use even in situations with limited space. Furthermore, its simple structure and low manufacturing cost reduce production costs. When providing continuous and prolonged clamping force to the workpiece, the clamping force, due to the first working medium, always tends to move towards the workpiece, enabling the clamping clamp to stably hold the workpiece and ensure machining accuracy. Simultaneously, the clamping clamp of this application provides strong holding force, stable clamping, and high rigidity, ensuring that machining requires strong holding force and high machining accuracy, meeting user machining needs, and improving the versatility of the clamping clamp.

[0007] In a first aspect, the normally closed clamping device according to an embodiment of the present invention includes:

[0008] The base has a working cavity;

[0009] The clamping member includes a first driving end, a second driving end, and a clamping end connected to each other. The first driving end and the second driving end are located in the working cavity. The clamping end is used to abut against and fix the object to be clamped. The clamping member divides the working cavity into a first cavity and a second cavity. The first driving end is close to the first cavity, and the second driving end is close to the second cavity.

[0010] An adjusting component is installed in the working chamber. The adjusting component, the first driving end, and the working chamber cooperate to form a first cavity. The second driving end cooperates with the working chamber to form a second cavity. The first cavity is used to contain a first working medium. The first working medium is used to push the first driving end to move so that the clamping end comes into contact with the object to be clamped. The second cavity is used to contain a second working medium. The second working medium pushes the second driving end to move so that the clamping end moves away from the object to be clamped.

[0011] The normally closed clamping device according to the embodiments of this utility model has at least the following beneficial effects: The normally closed clamping device of this application has a simple structure and is easy to operate. Through the combined use of a first working medium (such as a spring) and a second working medium (such as hydraulic oil), stable clamping and loosening of the clamping end are achieved. In addition, the clamping force can be easily adjusted by setting the adjusting member to meet different usage requirements. It can be understood that by changing the position of the adjusting member, the size of the first cavity is changed, thereby changing the thrust of the first working medium on the clamping member, thereby realizing the clamping force of the clamping member on the workpiece. It has high flexibility and adaptability, can meet the clamping of guide rails of different sizes, and improves the versatility of the clamper. The specific working principle is as follows: the first working medium generates a thrust on the clamping member, so that the clamping member always clamps the workpiece. When the second working medium is introduced into the second cavity, when the thrust generated by the second working medium on the clamping member is greater than the thrust generated by the first working medium on the clamping member, the second working medium pushes the clamping member to move towards the adjusting member. At this time, the clamping end moves away from the workpiece, and the workpiece is released. After the second working medium is discharged from the second cavity, the thrust of the second working medium on the clamping member gradually decreases. When the thrust of the first working medium on the clamping member is greater than the thrust of the second working medium, the clamping member begins to gradually move away from the adjusting member until the second working medium is completely discharged from the second cavity. At this point, the clamping member is fully reset by the thrust of the first working medium, and the clamping device returns to its normally closed state. The position of the adjusting member within the working cavity can be adjusted to change the size of the first cavity, thereby altering the thrust of the first working medium on the clamping member. This satisfies the diverse clamping force requirements of normally closed clamping devices and improves the versatility of the clamp.

[0012] According to the normally closed clamping device of this utility model embodiment, the first working medium is an elastic element, which is used to push the first driving end to move so that the clamping end abuts against the object to be clamped.

[0013] According to the normally closed clamping device of this utility model embodiment, one end of the elastic member abuts against the adjusting member, and the other end abuts against the second driving end. The elastic member is always in a compressed state so that the clamping end always has a tendency to move toward the object to be clamped.

[0014] According to the normally closed clamping device of this utility model embodiment, the elastic element is a spring.

[0015] According to the normally closed clamping device of this utility model embodiment, a positioning post is provided at the first driving end, and a positioning hole is provided on the elastic element. The positioning post and the positioning hole are engaged to ensure the stable installation of the elastic element.

[0016] According to the normally closed clamping device of this utility model embodiment, the clamping member is provided with a positioning ring groove, which is located between the second driving end and the clamping end. The positioning ring groove is fitted with a sealing ring and a sealing ring, which are used to abut against the cavity wall of the working cavity to seal.

[0017] According to the normally closed clamping device of this utility model embodiment, the clamping member is provided with a positioning ring groove, which is located between the first driving end and the second driving end. The positioning ring groove is fitted with a sealing ring and a sealing ring, which are used to abut against the cavity wall of the working cavity to seal.

[0018] According to the normally closed clamping device of this utility model embodiment, the second working medium is hydraulic oil, and the seat has an oil supply circuit for connecting the second cavity. The hydraulic oil enters or flows out of the second cavity through the oil supply circuit, thereby controlling the loosening or clamping of the clamping end.

[0019] According to the normally closed clamping device of this utility model embodiment, the number of clamping members and adjusting members is several pairs, and one pair of clamping members clamps the object to be clamped.

[0020] Secondly, the clamp according to the embodiments of the present invention includes the normally closed clamping device described above.

[0021] The clamping device according to the embodiments of this utility model has at least the following beneficial effects: The normally closed clamping device of this application has a simple structure and is easy to operate. Through the combined use of a first working medium (such as a spring) and a second working medium (such as hydraulic oil), stable clamping and loosening of the clamping end are achieved. In addition, the clamping force can be easily adjusted by setting the adjusting component to meet different usage requirements. It can be understood that by changing the position of the adjusting component, the size of the first cavity is changed, thereby changing the thrust of the first working medium on the clamping component, thus realizing the clamping force of the clamping component on the workpiece. It has high flexibility and adaptability, can meet the clamping of guide rails of different sizes, and improves the versatility of the clamping device. The specific working principle is as follows: the first working medium generates a thrust on the clamping component, so that the clamping component always clamps the workpiece. When the second working medium is introduced into the second cavity, when the thrust generated by the second working medium on the clamping component is greater than the thrust generated by the first working medium on the clamping component, the second working medium pushes the clamping component to move towards the adjusting component. At this time, the clamping end moves away from the workpiece, thus releasing the workpiece. After the second working medium is discharged from the second cavity, the thrust of the second working medium on the clamping member gradually decreases. When the thrust of the first working medium on the clamping member is greater than the thrust of the second working medium, the clamping member begins to gradually move away from the adjusting member until the second working medium is completely discharged from the second cavity. At this point, the clamping member is fully reset by the thrust of the first working medium, and the clamping device returns to its normally closed state. The position of the adjusting member within the working cavity can be adjusted to change the size of the first cavity, thereby altering the thrust of the first working medium on the clamping member. This satisfies the diverse clamping force requirements of normally closed clamping devices and improves the versatility of the clamp.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this invention will become apparent from the description of the embodiments taken in conjunction with the following drawings.

[0024] Obviously and easy to understand, among which:

[0025] Figure 1 is a structural diagram of the normally closed clamping device according to an embodiment of the present invention;

[0026] Figure 2 is an exploded view of the normally closed clamping device according to an embodiment of the present invention.

[0027] Figure 3 is a cross-sectional view of the normally closed clamping device according to an embodiment of the present invention;

[0028] Figure 4 is an enlarged view of the figure marked A in Figure 3;

[0029] Figure 5 is a structural perspective view of the first embodiment of the normally closed clamping device of this utility model;

[0030] Figure 6 is a structural perspective view of the second embodiment of the normally closed clamping device of this utility model.

[0031] Explanation of reference numerals in the attached drawings: Base 100; Working chamber 110; First chamber 111; Second chamber 112; Oil supply passage 120; Clamping chamber 130; Clamping element 200; First drive end 210; Positioning pin 211; Second drive end 220; Clamping end 230; Positioning ring groove 240; Adjusting element 300; First working medium 400; Positioning hole 410; Sealing ring 500; Sealing ring 600. Detailed Implementation

[0032] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0033] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0034] In the description of a utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or the order of the indicated technical features.

[0035] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0036] Referring to Figures 1 to 5, this embodiment of the present invention provides a normally closed clamping device, including a base 100 having a working cavity 110; a clamping member 200 including a first driving end 210, a second driving end 220, and a clamping end 230 connected to each other. The first driving end 210 and the second driving end 220 are located within the working cavity 110, and the clamping end 230 is used to abut against and fix the object to be clamped. The clamping member 200 divides the working cavity 110 into a first cavity 111 and a second cavity 112. The first driving end 210 is close to the first cavity 111, and the second driving end 220 is close to the second cavity 112. 12; Adjustment component 300, installed in working chamber 110, adjustment component 300, first drive end 210 and working chamber 110 cooperate to form first cavity 111, second drive end 220 cooperates with working chamber 110 to form second cavity 112, first cavity 111 is used to contain first working medium 400, first working medium 400 is used to push first drive end 210 to move so that clamping end 230 abuts against the object to be clamped, second cavity 112 is used to contain second working medium, second working medium pushes second drive end 220 to move so that clamping end 230 moves away from the object to be clamped.

[0037] The normally closed clamping device of this application has a simple structure and is easy to operate. By using a first working medium 400 (such as a spring) and a second working medium (such as hydraulic oil), stable clamping and loosening of the clamping end 230 are achieved. In addition, the clamping force can be easily adjusted by the setting of the adjusting part 300 to meet different usage requirements.

[0038] It is understandable that by changing the position of the adjusting member 300, the size of the first cavity 111 is changed, thereby altering the thrust of the first working medium 400 on the clamping member 200, thus controlling the clamping force of the clamping member 200 on the workpiece. Furthermore, by changing the position of the adjusting member 300, the size of the first cavity 111 can be adjusted, meaning the working stroke of the first working medium 400 can be adjusted to ensure sufficient space for compression when the clamping device releases the workpiece. After the second working medium is discharged from the second cavity 112, the first working medium 400 can generate power on the first drive end 210 to push the clamping member 200, allowing the clamping end 230 to re-apply to the object to be clamped, achieving re-clamping. This provides high flexibility and adaptability, satisfying the clamping requirements of guide rails of different sizes and improving the versatility of the clamping device. Specifically, the working principle is: the first working medium 400 generates a thrust on the clamping member 200, ensuring that the clamping member 200 always clamps the workpiece. When the second working medium is introduced into the second cavity 112, and the thrust exerted by the second working medium on the clamping member 200 is greater than the thrust exerted by the first working medium 400 on the clamping member 200, the second working medium pushes the clamping member 200 toward the adjusting member 300. At this time, the clamping end 230 moves away from the workpiece, thus releasing the workpiece. When the second working medium is discharged from the second cavity 112, the thrust exerted by the second working medium on the clamping member 200 gradually decreases. When the thrust exerted by the first working medium 400 on the clamping member 200 is greater than the thrust exerted by the second working medium, the clamping member 200 begins to gradually move away from the adjusting member 300 until the second working medium is completely discharged from the second cavity 112. At this time, the clamping member 200 is completely reset by the thrust exerted by the first working medium 400, and the clamping device returns to its normally closed state. The position of the adjustable member 300 within the working chamber 110 can be adjusted to change the size of the first chamber 111, thereby altering the thrust of the first working medium 400 on the clamping member 200. This satisfies the diverse clamping force requirements of normally closed clamping devices and improves the versatility of the clamp.

[0039] According to some embodiments of this application, the first working medium 400 is an elastic element, which is used to push the first driving end 210 to move so that the clamping end 230 abuts against the object to be clamped. Specifically, one end of the elastic element abuts against the adjusting member 300, and the other end abuts against the second driving end 220. The elastic element is always in a compressed state so that the clamping end 230 always has a tendency to move toward the object to be clamped.

[0040] Preferably, the first working medium 400 of this application is a spring. The elasticity of the spring can be selected according to actual needs. Furthermore, when the user needs to replace the spring, the user only needs to remove the adjusting member 300 to replace the spring inside the first cavity 111. Preferably, the adjusting member 300 and the seat 100 can be threaded together, ensuring a stable and reliable connection.

[0041] It should be noted that the first working medium 400 is not limited to a spring, but can be other elastic bodies or other media that can be compressed and have a rebounding ability.

[0042] Understandably, when the second working medium is not introduced into the second cavity 112, the spring is still in a compressed state. The purpose is to ensure that the clamping device can always provide good clamping force, and also to ensure that when the second working medium is discharged from the second cavity 112, the spring has a large thrust to push the clamping member 200 to reset.

[0043] According to some embodiments of this application, the first drive end 210 is provided with a positioning post 211, and the elastic element is provided with a positioning hole 410. The positioning post 211 and the positioning hole 410 are engaged and inserted to ensure the stable installation of the elastic element. It can be understood that the engagement of the positioning post 211 and the positioning hole 410 can guide the spring when it is unfolded or compressed.

[0044] According to some embodiments of this application, the clamping member 200 is provided with a positioning ring groove 240, which is disposed between the second driving end 220 and the clamping end 230. A sealing ring 500 and a sealing ring 600 are fitted into the positioning ring groove 240, and the sealing ring 500 and the sealing ring 600 are used to abut against the cavity wall of the working chamber 110 for sealing. Further, a positioning ring groove 240 is also provided between the first driving end 210 and the second driving end 220, and the positioning ring groove 240 is fitted with a sealing ring 500 and a sealing ring 600, which are used to abut against the cavity wall of the working chamber 110 for sealing. The sealing performance is improved by the sealing ring 500 and the sealing ring 600, preventing the second working medium from penetrating into the first cavity 111.

[0045] It should be noted that the second working medium can be hydraulic oil or other media. This application does not specifically limit the type of the second working medium, and users can choose according to actual conditions. Preferably, the second working medium is hydraulic oil.

[0046] According to some embodiments of this application, the seat 100 has an oil supply passage 120 for connecting to the second cavity 112. Hydraulic oil enters or flows out of the second cavity 112 through the oil supply passage 120, thereby controlling the loosening or clamping of the clamping end 230.

[0047] According to some embodiments of this application, the base 100 is provided with a clamping cavity 130 for placing a workpiece.

[0048] According to some embodiments of this application, multiple pairs of clamping members 200 and adjusting members 300 can be provided. As shown in FIG6, multiple pairs of clamping members 200 and adjusting members 300 can be provided along the radial direction of the base 100 to sequentially meet the different clamping force requirements of the workpiece. It is understood that when the user has certain requirements for the clamping force of the object, the number of clamping members 200 can be increased to improve the clamping force on the object, ensure the clamping stability of the object, ensure the machining accuracy, and meet the user's needs.

[0049] This application also provides a clamping device that uses the above-described clamping mechanism.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A normally closed clamping device, characterized in that, include: The base has a working cavity; The clamping member includes a first driving end, a second driving end, and a clamping end connected to each other. The first driving end and the second driving end are located in the working cavity. The clamping end is used to abut against and fix the object to be clamped. The clamping member divides the working cavity into a first cavity and a second cavity. The first driving end is close to the first cavity, and the second driving end is close to the second cavity. An adjusting component is installed in the working cavity. The adjusting component, the first driving end, and the working cavity cooperate to form the first cavity. The second driving end cooperates with the working cavity to form the second cavity. The first cavity is used to accommodate a first working medium. The first working medium is used to push the first driving end to move so that the clamping end abuts against the object to be clamped. The second cavity is used to accommodate a second working medium. The second working medium pushes the second driving end to move so that the clamping end moves away from the object to be clamped.

2. The normally closed clamping device according to claim 1, characterized in that, The first working medium is an elastic element, which is used to push the first driving end to move so that the clamping end abuts against the object to be clamped.

3. The normally closed clamping device according to claim 2, characterized in that, One end of the elastic element abuts against the adjusting element, and the other end abuts against the second driving end. The elastic element is always in a compressed state so that the clamping end always tends to move toward the object to be clamped.

4. The normally closed clamping device according to any one of claims 2 or 3, characterized in that, The elastic element is a spring.

5. The normally closed clamping device according to claim 2, characterized in that, The first driving end is provided with a positioning post, and the elastic element is provided with a positioning hole. The positioning post and the positioning hole are engaged and inserted into each other.

6. The normally closed clamping device according to claim 1, characterized in that, The clamping member is provided with a positioning ring groove, which is located between the second driving end and the clamping end. A sealing ring and a sealing ring are fitted into the positioning ring groove, and the sealing ring and the sealing ring are used to abut against the cavity wall of the working cavity to seal it.

7. The normally closed clamping device according to claim 1, characterized in that, The clamping member is provided with a positioning ring groove, which is located between the first driving end and the second driving end. A sealing ring and a sealing ring are fitted into the positioning ring groove, and the sealing ring and the sealing ring are used to abut against the cavity wall of the working cavity to seal it.

8. The normally closed clamping device according to claim 1, characterized in that, The second working medium is hydraulic oil, and the seat has an oil supply circuit for connecting the second cavity, through which the hydraulic oil enters or flows out of the second cavity.

9. The normally closed clamping device according to claim 1, characterized in that, The number of clamping members and adjusting members is several pairs, and one pair of clamping members clamps the object to be clamped.

10. A clamp, characterized in that, Includes the normally closed clamping device as described in any one of claims 1 to 9.

Images