An inflatable chuck

Abstract

The utility model discloses an inflatable chuck, which aims to solve the problem of large volume of the curling head in the related technology. The utility model comprises a housing, a piston and an expansion key. The piston is axially slidably installed in the housing, an elastic member is abutted between the piston and the housing, a piston cavity is provided between the piston and the housing, an air inlet hole is provided on the cavity wall of the piston cavity, the expansion key is radially slidably installed on the housing, the piston and the expansion key are matched at a wedge angle to achieve force amplification, and when the piston overcomes the elastic member to move, the piston drives the expansion key to extend out of the housing. The wedge angle of the piston and the expansion key is matched to achieve force amplification and reduce the axial length of the chuck.

Description

Technical Field

[0001] The utility model relates to the technical field of brakes, and more specifically, to an inflatable chuck. Background Art

[0002] The chuck is a positioning structure for the roll body at the reeling and unreeling ends of the reeling and unreeling device. Its function is to position or release the reel of the reel body by radially extending or retracting, and then drive the chuck to rotate through the transmission structure to achieve reeling and unreeling.

[0003] Today's chucks are generally longer, making it inconvenient to load and unload the roll, and their length also increases the width of the equipment.

[0004] The present application aims to provide an inflatable chuck with a smaller axial length and more convenient loading and unloading. Summary of the invention

[0005] The utility model overcomes the drawback of the larger volume of the rolling head in the related art, and provides an inflatable chuck with a smaller axial length, which is more convenient for loading and unloading.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] An inflatable chuck comprises a shell, a piston and an expansion key. The piston is axially slidably installed in the shell, an elastic member is abutted between the piston and the shell, a piston cavity is provided between the piston and the shell, an air inlet hole is provided on the cavity wall of the piston cavity, and the expansion key is radially slidably installed on the shell. The wedge angle of the piston and the expansion key cooperate to achieve force amplification. When the piston overcomes the elastic member to move, the piston drives the expansion key to extend out of the shell.

[0008] The present application uses a piston to realize pneumatic operation. The pressure difference on both sides of the piston is used to push the piston to overcome the elastic member and move.

[0009] During the movement of the piston, the expansion key is pushed to move. The preset movement direction of the expansion key and the housing is radial movement. The expansion key and the wedge surface of the piston cooperate to realize the conversion of axial force into radial direction, and the force is amplified by the wedge angle cooperation. Each expansion key is extended synchronously and abuts against the inner wall surface of the roll body to realize the positioning of the roll body. The structure can be made shorter by the wedge angle cooperation under the same braking torque output, so that loading and unloading are easier.

[0010] Preferably, there are several expansion keys, which are arranged at equal intervals around the axis of the shell. The structure makes the expansion keys output a more uniform braking torque to the inner wall of the external roll, thus avoiding damage to the roll due to excessive stress.

[0011] Preferably, the outer edge of the piston is provided with an inclined sliding groove, the bottom of the expansion key is provided with a sliding key, and the sliding key is slidably installed in the sliding groove. The cooperation between the sliding groove and the sliding key can reduce the wear on the piston and the expansion key.

[0012] Preferably, the piston comprises a first piston body and a second piston body of an integral structure, the first piston body and the second piston body are coaxial and the diameter of the first piston body is smaller than the diameter of the second piston body, and expansion keys are installed on the first piston body and the second piston body. The structure outputs braking force on different cross sections to reduce the pressure on the positioned roll body.

[0013] Preferably, the number of expansion keys on the first piston body is four.

[0014] Preferably, the number of expansion keys on the second piston body is 6.

[0015] Preferably, the piston has a piston counterbore forming a piston cavity, the diameter of the opening of the piston counterbore is larger than the diameter of the bottom wall, and the inclination angle of the side wall of the piston counterbore is the same as the inclination angle of the slide groove.

[0016] Preferably, the expansion key further comprises a slider and a key bar, one end of the slider is fixedly connected to the slider key, the other end of the slider is fixedly connected to the key bar, the housing is provided with a sliding hole arranged in the radial direction, the slider is slidably connected in the sliding hole, the key bar is used to abut against the roll body, and the slider is used to cooperate with the sliding hole.

[0017] Preferably, the second piston body is provided with an elastic member positioning hole along the axial direction, the elastic member positioning hole is located between adjacent expansion keys, and the elastic member is installed in the elastic member positioning hole. The elastic member is positioned by the structure, wherein the elastic member is a compression spring.

[0018] Preferably, an end of the shell away from the elastic member is fixedly connected with an end cover, the end cover, the side wall of the shell and the piston form a piston cavity, and the air inlet hole is opened on the end cover.

[0019] As a preferred embodiment, the circumferential pressure provided by an expansion key is , the corresponding thrust of the piston is The angle of the wedge is , Compared with the prior art, the beneficial effects of the utility model are:

[0020] (1) The wedge angles of the piston and the expansion key are matched to amplify the force and reduce the axial length of the chuck;

[0021] (2) The piston is matched with the sliding key through the sliding groove and the expansion key, which reduces wear and extends the service life of the chuck. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the axial side of the utility model; Figure 2It is a front view of the utility model; Figure 3 yes Figure 2 Sectional view at AA; Figure 4 yes Figure 2 Cross-section at the middle BB; Figure 5 It is an exploded view of the utility model; Figure 6 It is a schematic diagram of the wedge angle cooperation of the present application to achieve force amplification; in the figure: housing 1, piston 2, expansion key 3, elastic member 4, piston chamber 5, air inlet 6, slide groove 7, slide key 8, first piston body 9, second piston body 10, piston counterbore 11, slider 12, key strip 13, elastic member positioning hole 14, end cover 15, slide hole 16, sealing ring 17. DETAILED DESCRIPTION

[0023] The present disclosure is further described below in conjunction with the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] In the present disclosure, terms such as "fixed connection", "connected", "connection", etc. should be understood in a broad sense, indicating that it can be fixedly connected, integrally connected or detachably connected; it can be directly connected or indirectly connected through an intermediate medium. For relevant scientific research or technical personnel in this field, the specific meanings of the above terms in the present disclosure can be determined according to specific circumstances, and they cannot be understood as limitations on the present disclosure.

[0027] Embodiment: A pneumatic chuck, Figure 1 , 3 As shown, it includes a housing 1, a piston 2 and a key 3. The piston 2 is axially slidably installed in the housing 1, and the key 3 is radially slidably installed on the housing 1. The piston 2 and the key 3 are wedge-angle matched to achieve force amplification. When the piston 2 overcomes the elastic member 4 to move, the piston 2 drives the key 3 to extend out of the housing 1.

[0028] One end of the shell 1 is open, and various components are placed through the open opening. The open opening is detachably connected to an end cover 15 via a fastener.

[0029] The piston 2 is slidably connected in the housing 1, and the space between the housing 1 and the piston 2 constitutes a piston chamber 5. The outer diameter of the piston 2 is adapted to the inner diameter of the housing 1. The piston 2 and the housing 1 are coaxially arranged. This allows the piston 2 to be axially displaced relative to the housing 1.

[0030] Ginseng Figure 2 , 3 As shown in Figures 5 and 6, the expansion key 3 includes a key bar 13 for abutting against the coil, a slider 12 and a slide key 8. The slider 12 is used for sliding cooperation with the housing 1. The slide key 8 is used for sliding cooperation with the piston 2. The housing 1 is provided with a slide hole 16 arranged in the radial direction, and the slider 12 is slidably connected in the slide hole 16. The outer edge of the piston 2 is provided with an inclined slide groove 7, and the bottom of the expansion key 3 is provided with a slide key 8, and the slide key 8 is slidably installed in the slide groove 7. The wear on the piston 2 and the expansion key 3 is reduced by the cooperation of the slide groove 7 and the slide key 8. In some embodiments, the slider 12 and the key bar 13 are an integral structure.

[0031] A piston chamber 5 is provided between the piston 2 and the housing 1. The outer edge of the piston 2 has a sealing ring 17 to ensure the sealing of the piston chamber 5 and prevent gas leakage and insufficient pressure. An air inlet 6 is provided on the cavity wall of the piston chamber 5. Specifically, the air inlet 6 is provided on the end cover 15.

[0032] Ginseng Figure 3 , 4 The piston 2 has a piston counterbore 11 forming a piston chamber 5 , the diameter of the opening of the piston counterbore 11 is larger than the diameter of the bottom wall, and the inclination angle of the side wall of the piston counterbore 11 is the same as the inclination angle of the slide groove 7 .

[0033] Ginseng Figure 5 The piston 2 includes a first piston body 9 and a second piston body 10 of an integral structure. The first piston body 9 and the second piston body 10 are coaxial and the diameter of the first piston body 9 is smaller than that of the second piston body 10. The first piston body 9 and the second piston body 10 are both installed with expansion keys 3. The structure outputs braking force on different cross sections to reduce the pressure on the positioned roll body. The number of expansion keys 3 on the first piston body 9 is 4. The number of expansion keys 3 on the second piston body 10 is 6. The second piston body 10 is provided with an elastic member positioning hole 14 along the axial direction, and the elastic member positioning hole 14 is located between adjacent expansion keys 3. The elastic member 4 is installed in the elastic member positioning hole 14. The elastic member 4 is positioned by the structure, wherein the elastic member 4 is a compression spring.

[0034] The present application uses a piston 2 to realize pneumatic operation. The pressure difference on both sides of the piston 2 pushes the piston 2 to overcome the elastic member 4 and move.

[0035] During the movement of the piston 2, the expansion key 3 is pushed to move. The preset movement direction of the expansion key 3 and the housing 1 is radial movement. The expansion key 3 and the wedge surface of the piston 2 cooperate to realize the conversion of the axial force into the radial direction, and the force is amplified by the wedge angle cooperation. Each expansion key 3 extends synchronously and abuts against the inner wall surface of the roll body to realize the positioning of the roll body. The structure can be made shorter by the wedge angle cooperation under the same braking torque output, so that loading and unloading are easier.

[0036] There are several expansion keys 3, which are arranged at equal intervals around the axis of the housing 1. The structure enables the expansion keys 3 to output a more uniform braking torque to the inner wall of the external roll, thereby avoiding damage to the roll due to excessive stress.

[0037] Ginseng Figure 6 , the circumferential pressure provided by an expansion key 3 is , the thrust of piston 2 is , and the force corresponding to a specific expansion key 3 is The angle of the wedge is , .

[0038] The process of using this application is as follows:

[0039] In the absence of external air, the elastic member 4 pushes the piston 2 to minimize the volume of the piston chamber 5 , and the slide groove 7 on the piston 2 drives the sliding key 8 to move, so that the expansion key 3 is completely located below the surface of the housing 1 .

[0040] After the external force is charged, the pressure generated by the air pressure difference between the piston chamber 5 and the piston 2 and the housing 1 pushes the piston 2 to move after overcoming the elastic force, and the slide groove 7 drives the sliding key 8 to move. The sliding key 8 extends out of the housing 1 and expands the winding body to achieve positioning. The force value of the piston 2 is amplified by the wedge angle amplification principle, so the torque transmission is completed.

[0041] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. An inflatable chuck, characterized in that: It includes a shell, a piston and an expansion key. The piston is axially slidably installed in the shell. An elastic member is abutted between the piston and the shell. A piston cavity is provided between the piston and the shell. An air inlet hole is provided on the cavity wall of the piston cavity. The expansion key is radially slidably installed on the shell. The wedge angle of the piston and the expansion key cooperates to achieve force amplification. When the piston overcomes the elastic member and moves, the piston drives the expansion key to extend out of the shell.

2. The pneumatic chuck according to claim 1, characterized in that: There are several expansion keys, which are arranged at equal intervals around the axis of the shell.

3. The pneumatic chuck according to claim 1, characterized in that: The outer edge of the piston is provided with an inclined sliding groove, the bottom of the expansion key is provided with a sliding key, and the sliding key is slidably installed in the sliding groove.

4. The pneumatic chuck according to claim 2, characterized in that: The piston comprises a first piston body and a second piston body of an integral structure. The first piston body and the second piston body are coaxial and the diameter of the first piston body is smaller than that of the second piston body. Expansion keys are installed on the first piston body and the second piston body.

5. The pneumatic chuck according to claim 4, characterized in that: The number of expansion keys on the first piston body is 4; the number of expansion keys on the second piston body is 6.

6. The pneumatic chuck according to claim 1, characterized in that: The piston is provided with a piston counterbore for forming a piston cavity, the diameter of the opening of the piston counterbore is larger than the diameter of the bottom wall, and the inclination angle of the side wall of the piston counterbore is the same as the inclination angle of the slide groove.

7. The pneumatic chuck according to claim 3, characterized in that: The expansion key also includes a slider and a key strip, one end of the slider is fixedly connected to the slider key, and the other end of the slider is fixedly connected to the key strip. The shell is provided with a sliding hole arranged in the radial direction, and the slider is slidably connected in the sliding hole.

8. The pneumatic chuck according to claim 1, characterized in that: The second piston body is provided with an elastic member positioning hole along the axial direction, the elastic member positioning hole is located between adjacent expansion keys, and the elastic member is installed in the elastic member positioning hole.

9. The pneumatic chuck according to claim 8, characterized in that: An end cover is fixedly connected to one end of the shell away from the elastic member. The end cover, the side wall of the shell and the piston form a piston cavity. The air inlet hole is arranged on the end cover.

10. An inflatable chuck according to any one of claims 1 to 9, characterized in that: The circumferential pressure provided by the expansion key is , the corresponding thrust of the piston is The angle of the wedge is , .

Images