Rotary table brake structure capable of tightly holding rotating shaft

Abstract

The utility model relates to the technical field of rotary table braking, and discloses a rotary table braking structure capable of tightly holding a rotating shaft. The rotary table brake structure capable of tightly holding the rotating shaft comprises a shell, a left air path is arranged in the left side of the shell, a right air path is arranged in the right side of the shell, an air inlet pipe is installed below the shell in a penetrating and inserting mode, a positioning pin is installed above the shell in a penetrating and inserting mode, and a deformation piece is installed below the positioning pin in a penetrating and inserting mode. A cylinder body is fixedly installed in the shell, an upper piston is movably installed below the deformation part, a lower piston is fixedly installed below the upper piston, a spring is fixedly installed below the upper piston, a rotating shaft is movably installed in the shell, and the deformation degree of the deformation part linearly changes along with the change of the position of the upper piston. And the pressure applied to the rotating shaft by the deformation piece is linearly changed, so that the situation that the instantaneous stress is too large due to instantaneous increase of the braking force during braking can be avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of turntable brakes, in particular to a turntable brake structure capable of tightly holding a rotating shaft. Background Art

[0002] When CNC machine tools process parts with complex spatial surfaces, multi-axis linkage machine tools are used. The workpieces of multi-axis linkage machine tools are generally clamped on a workbench or turntable for cutting. Usually, the machine tool first positions the turntable at the required position through the control system and the detection system, and then the turntable brake structure locks the rotating shaft on the turntable. Due to its actual use needs, the turntable usually has a built-in mechanical brake structure, which is mainly realized in the form of brake pads, that is, a thin brake pad with a thickness of 1-2mm is installed on the rotating shaft system. When braking is required, the piston is pushed to the outside of the brake pad through a cylinder or an oil cylinder, causing the brake pad to deform and completely adhere to the axially arranged static surface, thereby generating sufficient friction to resist the load of the shaft system.

[0003] The existing Chinese utility model patent with reference announcement number CN219925340U discloses a turntable brake structure, including a brake cylinder caliper body, a brake disc and a brake support body, wherein the brake support body is located below the brake cylinder caliper body, and the brake disc is located between the brake cylinder caliper body and the brake support body, wherein a first oil passage is provided inside the brake support body, and a second oil passage is provided inside the brake cylinder caliper body, wherein the first oil passage is connected to the second oil passage, and an oil chamber is provided in the inner cavity of the brake cylinder caliper body, and the bottom of the oil chamber is connected to the top of the second oil passage. The utility model relates to the technical field of turntable brakes. In the turntable brake structure, the brake cylinder caliper body presses the brake disc onto the brake support body due to hydraulic pressure, and the overall structure is simple, which reduces the cost of the overall device, can perform a good braking effect on the brake disc, and ensures the braking effect of the turntable brake, and has strong overall practicality and a wide range of applications.

[0004] The existing turntable brake structure is divided into encircling oil brake, disc air brake and clamp air brake. The encircling oil brake relies on oil pressure to make the brake encircle parts tightly, with a large braking torque and a stable and durable structure, but the processing cost is high, there is no self-locking function, it occupies a large axial space, and the turntable needs to be equipped with a hydraulic station, which is expensive. The disc brake relies on the cylinder to support the brake pad connected to the shaft to stop it from rotating. The braking force is relatively small, and the stress generated at the moment of brake switching is large, which is easy to wear and tear. The disc is easily damaged after long-term use. In addition, the encircling oil brake, disc air brake and clamp air brake all require a large axial space. Utility Model Content

[0005] 1. Technical issues to be resolved

[0006] In view of the deficiencies in the prior art, the utility model provides a turntable brake structure that can hold a rotating shaft tightly, has a self-locking function while ensuring braking force, has a compact structure, and has small instantaneous stress during braking, thus solving the above technical problems.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a turntable brake structure that can hold a rotating shaft, comprising: a shell, a left air path is arranged inside the left side of the shell, a right air path is arranged inside the right side of the shell, an air intake pipe is inserted and installed at the bottom of the shell, a positioning pin is inserted and installed at the top of the shell, a deformable part is inserted and installed at the bottom of the positioning pin, a cylinder body is fixedly installed inside the shell, an upper piston is movably installed below the deformable part, a lower piston is fixedly installed below the upper piston, a spring is fixedly installed below the upper piston, and a rotating shaft is movably installed inside the shell; the shell can limit the position of the rotating shaft and fix the position of the deformable part by the positioning pin.

[0009] As a preferred technical solution of the utility model, the left air path extends to the end of the cylinder body and is located between the bottom of the cylinder body and the lower piston, and the right air path end is located between the top of the cylinder body and the upper piston; the left air path can facilitate the gas to enter between the cylinder body and the lower piston, thereby moving the lower piston downward, and the right air path can facilitate the gas to enter between the cylinder body and the upper piston, so as to facilitate the upper and lower pistons to move upward.

[0010] As the preferred technical solution of the utility model, the air intake pipe is installed at the bottom of the shell in a mirror-symmetrical manner with the center of the shell as the reference, and the air intake pipe is connected to the left air path and the right air path; the air intake pipe can facilitate the gas to enter the left air path and the right air path.

[0011] As a preferred technical solution of the utility model, the positioning pin is installed in a ring shape at the upper end of the shell at an equal angle based on the center of the shell, and the positioning pin vertically penetrates the shell and is fixedly connected to the deformable part; the positioning pin can prevent the deformable part from rotating.

[0012] As a preferred technical solution of the present utility model, the cross-section of the deformable member is in the shape of a "bow", the inner side surface of the deformable member contacts the outer side surface of the rotating shaft, and the lower end of the deformable member contacts the upper piston; when the deformable member is subjected to pressure from the upper and lower sides, the inner diameter is reduced, thereby increasing the relative pressure between the deformable member and the rotating shaft and increasing the relative friction to achieve a braking effect.

[0013] As a preferred technical solution of the utility model, the upper piston is fixedly connected to the lower piston by bolts, and an annular groove structure engaged with a spring is provided below the upper piston. The spring is installed in a ring shape at an equal angle below the upper piston with the center of the upper piston as a reference, and the top of the spring is engaged in the groove structure below the upper piston; the upper piston can facilitate the gas to apply pressure to the deformable part.

[0014] As a preferred technical solution of the utility model, the upper end of the spring is fixedly connected to the upper piston, and the lower end of the spring is fixedly connected to the top surface of the cylinder body, and a rotational connection is formed between the rotating shaft and the shell; the rotating shaft can facilitate the rotation of the turntable.

[0015] Compared with the prior art, the utility model provides a turntable brake structure that can hold the rotating shaft tightly, which has the following beneficial effects:

[0016] 1. The utility model is provided with a deformable member, the cross section of which is in the shape of a "bow", the inner side of the deformable member contacts the outer side of the rotating shaft, the lower end of the deformable member contacts the upper piston, the upper end of the deformable member is fixedly connected to the housing through a positioning pin, and the deformable member cannot rotate under the restriction of the positioning pin. The bottom end of the spring fixed below the upper piston is connected to the cylinder body. When the device is not acted upon by external force, the vertical upward force applied by the spring to the upper piston causes the deformable member to produce an initial deformation, and when the upper and lower ends of the deformable member are pressurized The inner diameter is reduced, thereby holding the rotating shaft tightly to achieve the self-locking function, and when the right air circuit is ventilated and the left air circuit is blocked, the upper piston and the lower piston move downward as a whole, the deformed part returns to its original state, the inner diameter becomes larger, and the rotating shaft is released, the brake is released, the left air circuit is ventilated and the right air circuit is blocked, the air pressure generates an upward thrust, the upper piston and the lower piston move upward as a whole, and the deformed part is further compressed on the basis of the spring force, the inner diameter of the deformed part becomes smaller, holding the rotating shaft tightly, and the braking torque is further increased, thereby achieving the self-locking function while ensuring the braking force.

[0017] 2. The utility model sets the left air circuit and the right air circuit, and the left air circuit extends to the end of the cylinder body and is located between the bottom of the cylinder body and the lower piston, and the end of the right air circuit is located between the top of the cylinder body and the upper piston. When the right air circuit is ventilated and the left air circuit is not ventilated, the upper piston and the lower piston move downward as a whole, the deformed part returns to its original state, the inner diameter becomes larger, and the rotating shaft is loosened, the brake is released, the left air circuit is ventilated and the right air circuit is not ventilated, the air pressure generates an upward thrust, the upper piston and the lower piston move upward as a whole, and the deformed part is further pressed on the basis of the spring force, the inner diameter of the deformed part becomes smaller, the rotating shaft is tightly held, and the braking torque is further increased. This method avoids the use of hydraulic equipment for braking, which causes the height of the hydraulic rod to affect the overall height of the device, and can make the device structure more compact, and the deformation degree of the deformed part changes linearly with the change of the upper piston position, and the pressure applied by the deformed part to the rotating shaft changes linearly. This method can avoid the situation where the instantaneous stress is too large due to the instantaneous increase of the braking force during braking. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the utility model;

[0020] Figure 3 This is a schematic diagram of the interlocking structure between the deformation member and the housing of the utility model;

[0021] Figure 4 This is a schematic diagram of the connection structure between the rotating shaft and the deformable member of the utility model;

[0022] Among them: 1. shell; 11. left air path; 12. right air path; 13. intake pipe; 14. positioning pin; 15. deformation part; 16. cylinder body; 17. upper piston; 18. lower piston; 19. spring; 110. rotating shaft. DETAILED DESCRIPTION

[0023] The following is a further detailed description of the implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0024] In the description of the present invention, unless otherwise specified, "multiple" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] See also Figure 1 - Figure 4 In this embodiment, a turntable brake structure that can hold a rotating shaft includes: a shell 1, a left air path 11 is arranged inside the left side of the shell 1, a right air path 12 is arranged inside the right side of the shell 1, an air intake pipe 13 is inserted and installed at the bottom of the shell 1, a positioning pin 14 is inserted and installed at the top of the shell 1, a deformable member 15 is inserted and installed below the positioning pin 14, a cylinder body 16 is fixedly installed inside the shell 1, an upper piston 17 is movably installed below the deformable member 15, a lower piston 18 is fixedly installed below the upper piston 17, a spring 19 is fixedly installed below the upper piston 17, and a rotating shaft 110 is movably installed inside the shell 1.

[0027] The left gas path 11 extends to the end of the cylinder body 16 and is located between the bottom of the cylinder body 16 and the lower piston 18 , and the end of the right gas path 12 is located between the top of the cylinder body 16 and the upper piston 17 .

[0028] The air intake pipe 13 is installed below the housing 1 in a left-right mirror-symmetrical manner with the center of the housing 1 as a reference, and the air intake pipe 13 is communicated with the left air path 11 and the right air path 12 .

[0029] The positioning pin 14 is installed in a ring shape at an equal angle on the upper end of the housing 1 with the center of the housing 1 as a reference, and the positioning pin 14 vertically penetrates the housing 1 and is fixedly connected to the deformable member 15 .

[0030] The cross section of the deformable member 15 is in the shape of a bow. The inner side surface of the deformable member 15 contacts the outer side surface of the rotating shaft 110 , and the lower end of the deformable member 15 contacts the upper piston 17 .

[0031] The upper piston 17 is fixedly connected to the lower piston 18 by bolts. An annular groove structure engaged with the spring 19 is provided below the upper piston 17. The spring 19 is installed in an annular shape at an equal angle below the upper piston 17 with the center of the upper piston 17 as a reference. The top end of the spring 19 is engaged in the groove structure below the upper piston 17.

[0032] The upper end of the spring 19 is fixedly connected to the upper piston 17 , and the lower end of the spring 19 is fixedly connected to the top surface of the cylinder body 16 , so that the rotating shaft 110 and the housing 1 are in rotational connection.

[0033] Specifically, the shell 1 can limit the position of the rotating shaft 110 and fix the position of the deformable member 15 by the positioning pin 14. The left air path 11 can facilitate the gas to enter between the cylinder body 16 and the lower piston 18, so that the lower piston 18 moves downward. The right air path 12 can facilitate the gas to enter between the cylinder body 16 and the upper piston 17, so as to facilitate the upper piston 17 and the lower piston 18 to move upward. The intake pipe 13 can facilitate the gas to enter the left air path 11 and the right air path 12. The positioning pin 14 can prevent the deformable member 15 from rotating. The cylinder body 16 can limit the gas position. The upper piston 17 can facilitate the gas to apply pressure to the deformable member 15. The lower piston 18 can facilitate the gas to drive the upper piston 17 to move downward. The spring 19 can cause the deformable member 15 to produce initial deformation. The rotating shaft 110 can facilitate the rotation of the turntable.

[0034] When in use, the cross-section of the deformable member 15 is in the shape of a "bow", the inner side of the deformable member 15 contacts the outer side of the rotating shaft 110, the lower end of the deformable member 15 contacts the upper piston 17, and the upper end of the deformable member 15 is fixedly connected to the housing 1 through the positioning pin 14. Under the restriction of the positioning pin 14, the deformable member 15 cannot rotate, and the bottom end of the spring 19 fixed below the upper piston 17 is connected to the cylinder body 16. When the device is not subjected to external force, the vertical upward force applied by the spring 19 to the upper piston 17 causes the deformable member 15 to produce initial deformation. When the upper and lower ends of the deformable member 15 are pressurized, the inner diameter is reduced, thereby holding the rotating shaft 110 tightly to achieve a self-locking function, and the left air path 11 extends to the end of the cylinder body 16 and is located between the bottom of the cylinder body 16 and the lower piston 18, and the end of the right air path 12 is located between the top of the cylinder body 16 and the upper piston 17. When the right air path 12 is ventilated and the left air path 11 is not ventilated, the upper piston 17 and the lower piston 18 move downward as a whole, the deformable member 15 returns to its original state, the inner diameter becomes larger, the rotating shaft 110 is released, and the brake is released. When the left air path 11 is ventilated and the right air path 12 is not ventilated, the air pressure generates an upward thrust, and the upper piston 17 and the lower piston 18 move upward as a whole, and further compress the deformable member 15 on the basis of the elastic force of the spring 19. The inner diameter of the deformable member 15 becomes smaller, and the rotating shaft 110 is tightly held, and the braking torque is further increased, thereby ensuring the braking force while realizing the self-locking function. This method avoids the use of hydraulic equipment for braking, which causes the height of the hydraulic rod to affect the overall height of the device, and can make the device structure more compact. The degree of deformation of the deformable member 15 changes linearly with the change of the position of the upper piston 17, and the pressure applied by the deformable member 15 to the rotating shaft 110 changes linearly. This method can avoid the situation where the instantaneous stress is too large due to the instantaneous increase of the braking force during braking.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A turntable brake structure capable of holding a rotating shaft tightly, characterized in that: include: A shell (1), wherein a left air path (11) is arranged inside the left side of the shell (1), a right air path (12) is arranged inside the right side of the shell (1), an air intake pipe (13) is inserted and installed below the shell (1), a positioning pin (14) is inserted and installed above the shell (1), a deformable member (15) is inserted and installed below the positioning pin (14), a cylinder (16) is fixedly installed inside the shell (1), an upper piston (17) is movably installed below the deformable member (15), a lower piston (18) is fixedly installed below the upper piston (17), a spring (19) is fixedly installed below the upper piston (17), and a rotating shaft (110) is movably installed inside the shell (1).

2. The turntable brake structure capable of holding a rotating shaft according to claim 1, characterized in that: The left air path (11) extends to the end of the cylinder body (16) and is located between the bottom of the cylinder body (16) and the lower piston (18), and the end of the right air path (12) is located between the top of the cylinder body (16) and the upper piston (17).

3. The turntable brake structure capable of holding a rotating shaft according to claim 1, characterized in that: The air intake pipe (13) is installed below the shell (1) in a mirror-symmetrical manner with the center of the shell (1) as a reference, and the air intake pipe (13) is connected to the left air path (11) and the right air path (12).

4. The turntable brake structure capable of holding a rotating shaft according to claim 1, characterized in that: The positioning pin (14) is installed in a ring shape at an equal angle on the upper end of the shell (1) with the center of the shell (1) as a reference, and the positioning pin (14) vertically penetrates the shell (1) and is fixedly connected to the deformable member (15).

5. The turntable brake structure capable of holding a rotating shaft according to claim 1, characterized in that: The cross section of the deformable member (15) is in the shape of a bow, the inner side surface of the deformable member (15) contacts the outer side surface of the rotating shaft (110), and the lower end of the deformable member (15) contacts the upper piston (17).

6. The turntable brake structure capable of holding a rotating shaft according to claim 1, characterized in that: The upper piston (17) is fixedly connected to the lower piston (18) by bolts. An annular groove structure engaged with a spring (19) is provided below the upper piston (17). The spring (19) is installed in an annular shape at an equal angle below the upper piston (17) with the center of the upper piston (17) as a reference. The top end of the spring (19) is engaged in the groove structure below the upper piston (17).

7. The turntable brake structure capable of holding a rotating shaft tightly according to claim 1, characterized in that: The upper end of the spring (19) is fixedly connected to the upper piston (17), and the lower end of the spring (19) is fixedly connected to the top surface of the cylinder body (16), and a rotation connection is formed between the rotating shaft (110) and the housing (1).

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