Brake device of numerical control rotary table

Abstract

The utility model relates to the field of numerically-controlled machine tools, and discloses a brake device of a numerically-controlled rotary table, which comprises a fixed seat with a longitudinal guide cavity; the brake piece comprises a brake part and a driving part connected with the brake part, and the brake part is located in the guide cavity; the outer edge end of the first brake disc is fixedly connected with the fixed seat, and the inner edge end of the first brake disc is located below the brake part; the second brake disc and the first brake disc are longitudinally arranged at an interval, the outer edge end of the second brake disc is located below the brake part and overlapped with the inner edge end of the first brake disc, and the inner edge end of the second brake disc extends into the guide cavity; the driving piece is arranged on the driving part so as to generate downward braking force on the braking piece; and the gas-liquid cavity is formed between the driving part and the fixed seat so as to generate upward counter braking force to the brake piece when gas or liquid is injected into the gas-liquid cavity. The structure is reliable; the braking effect is good, and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control machine tools, in particular to a braking device for a numerical control turntable. Background Art

[0002] The CNC turntable is an important component of the CNC machine tool. The turntable is used to clamp the workpiece and position the workpiece at the required processing position. The turntable's brake device is then used to brake and lock the turntable's rotating shaft, so that the workpiece remains in the processing position and does not move at will during the processing.

[0003] In the prior art, the brake device of the turntable usually includes a single brake pad installed on the spindle and an air cylinder or oil cylinder used in conjunction with the brake pad. The air cylinder or oil cylinder pushes the brake pad, causing the brake pad to deform and completely adhere to the spindle, generating sufficient friction to stop the spindle from rotating. This single-piece brake piston structure has insufficient braking force and poor braking effect, making it difficult to be applied to heavy-duty cutting work of CNC machine tools. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model proposes a brake device for a numerically controlled turntable, aiming to solve the technical problem that the existing turntable brake structure has a poor braking effect.

[0005] The utility model provides a brake device for a numerically controlled turntable, the brake device comprising:

[0006] A fixed seat having a longitudinal guide cavity;

[0007] A brake component, comprising a brake part and a driving part connected to the brake part, wherein the brake part is located in the guide cavity;

[0008] A first brake disc, the outer edge of which is fixedly connected to the fixing seat and the inner edge of which is located below the braking part;

[0009] a second brake disc, arranged longitudinally spaced apart from the first brake disc, the outer edge of the second brake disc being located below the braking portion and overlapping with the inner edge of the first brake disc, the inner edge of the second brake disc extending into the guide cavity;

[0010] A driving member, disposed on the driving portion to generate a downward braking force on the brake member;

[0011] A gas-liquid cavity is formed between the driving portion and the fixing seat so as to generate an upward counter-braking force on the brake member when gas or liquid is injected into the gas-liquid cavity.

[0012] In some preferred embodiments, the first brake disc includes two discs spaced apart in the longitudinal direction, and the outer edge end of the second brake disc is located between the inner edge ends of the two first brake discs.

[0013] In some preferred embodiments, the second brake disc includes two pieces spaced apart in the longitudinal direction, and the inner edge end of the first brake disc is located between the outer edge ends of the two pieces of the second brake disc.

[0014] In some preferred embodiments, the driving portion is in a circular ring shape, and a plurality of the driving members are evenly spaced and arranged on the driving portion.

[0015] In some preferred embodiments, a plurality of limiting grooves are provided on the upper end surface of the driving portion; the driving member is a spring, and one end of the spring is disposed in the limiting groove.

[0016] In some preferred embodiments, a first sealing groove is provided on the inner wall of the guide cavity or the outer wall of the braking portion, and a first sealing ring is provided in the first sealing groove to seal the gas-liquid cavity at the joint gap between the guide cavity and the braking portion.

[0017] In some preferred embodiments, a second sealing groove and a third sealing groove are respectively provided on the outer side wall of the driving part and the outer side wall of the fixed seat, and a second sealing ring and a third sealing ring are respectively provided in the second sealing groove and the third sealing groove to seal the gas-liquid cavity from the outer side wall of the driving part and the outer side wall of the fixed seat respectively.

[0018] In some preferred embodiments, the upper end surface of the fixing seat is provided with a gas-liquid inlet and outlet communicating with the gas-liquid cavity.

[0019] In some preferred embodiments, a longitudinally extending positioning pin is provided on the upper end surface of the driving portion to limit the lateral rotation of the brake member.

[0020] In some preferred embodiments, the brake device further comprises a support seat fixedly mounted below the fixing seat, and the first brake disc and the second brake disc are located between the fixing seat and the support seat.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The brake device disclosed by the utility model adopts the coordinated cooperation of the first brake disc and the second brake disc, and utilizes the brake block to move downward toward the inner edge end of the first brake disc under the action of the downward braking force generated by the driving member, so as to push the inner edge end of the first brake disc and the outer edge end of the second brake disc to make surface contact, so that a large friction braking force is quickly generated between the surfaces of the first brake disc and the second brake disc to achieve braking. The overall structure is reliable and the braking effect is good. The brake device can generate a large friction braking force so that the CNC turntable can adapt to the requirements of the CNC machine tool for heavy cutting work. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the appearance and structure of the brake device.

[0024] Figure 2 yes Figure 1 Schematic diagram of the AA cross-section structure.

[0025] Figure 3 It is a three-dimensional structural schematic diagram of the brake device.

[0026] Figure 4 yes Figure 3 A schematic diagram of the three-dimensional structure when the elastic member is not drawn.

[0027] Figure 5 yes Figure 4 Schematic diagram of the three-dimensional structure without drawing the brake pads.

[0028] Figure 6 yes Figure 5 Schematic diagram of the structure from another perspective. DETAILED DESCRIPTION

[0029] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined purpose, the specific implementation methods, structures, features and effects of the present application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0030] As a part of CNC machine tools, CNC turntables usually include a fixed part that is fixed in position and a rotating part that can rotate on demand. The fixed part of the CNC turntable includes at least a housing. The rotating part of the CNC turntable includes: a spindle arranged in the housing; a bearing located between the spindle and the housing, so that the spindle can rotate relative to the housing as required according to the bearing; a turntable fixed at one end of the spindle and located outside the housing, the turntable is used to clamp the workpiece to be processed, and rotates with the spindle to drive the workpiece to rotate to the required processing position.

[0031] The brake device of the CNC turntable is installed between the casing and the spindle, so that the spindle can stop rotating as needed, so as to send the workpiece to the required processing position and lock the position.

[0032] Combination Figure 1-Figure 6As shown, the utility model discloses a brake device for a CNC turntable, the brake device comprises a fixed seat 2, a brake member 3, a first brake disc 4, a second brake disc 5, a driving member 6 and a gas-liquid chamber 7; the fixed seat 2 has a longitudinal guide cavity, the fixed seat 2 provides support and longitudinal movable guide for the brake member 3, the fixed seat 2 is fixedly connected to the fixed part of the CNC turntable; the brake member 3 comprises a brake part 32 and a driving part 31 connected to the brake part 32, the brake part 31 is located in the guide cavity, and the inner side wall of the guide cavity provides a guide for the brake part 32 to move up and down in the longitudinal direction; the first brake disc 4 is usually annular, and its outer edge end is fixedly connected to the fixed seat 2, and the inner edge end of the first brake disc 4 is located at the brake part 32 At the bottom, when the braking part 32 moves downward, it can push the inner edge of the first brake disc 4 to move downward; the second brake disc 5 is also preferably annular, and there is a longitudinal spacing between the second brake disc and the first brake disc, and the outer edge of the second brake disc 5 is located below the braking part 32 and overlaps with the inner edge of the first brake disc 4, and the inner edge of the second brake disc 5 extends into the guide cavity of the fixed seat 2 and is fixedly connected to the main shaft of the CNC turntable; the driving member 6 is arranged on the driving part 31 to generate a downward braking force on the brake member 3; the gas-liquid chamber 7 is formed between the driving part 31 and the fixed seat 2, so as to generate an upward counter-braking force on the brake member 3 when gas or liquid is injected into the gas-liquid chamber 7.

[0033] The brake device is assembled in the CNC turntable. Specifically, the brake device is mounted on the main shaft, the inner edge end of the second brake disc 5 is fixedly connected to the main shaft, and the fixed seat 2 is fixedly connected to the fixed part of the CNC turntable, so that the end of the driving member 6 away from the driving part 31 is abutted against the end cover of the casing.

[0034] Furthermore, a longitudinally extending positioning pin 312 is provided on the upper end surface of the driving portion 31, and the other end of the positioning pin 312 is plugged into the end cover, so that the end cover is used to limit the lateral rotation of the brake member 3 along with the main shaft of the CNC turntable during the braking process.

[0035] The upper end surface of the fixing seat 2 is provided with a gas-liquid inlet and outlet 20 communicating with the gas-liquid cavity 7, and the gas-liquid inlet and outlet are connected to an air source or an oil source arranged on the outer side of the casing of the CNC turntable.

[0036] The driving part 31 is in a circular ring shape, and a plurality of driving members 6 are evenly spaced and arranged on the driving part 31 . The plurality of driving members 6 are used to provide uniform downward braking force to each position of the driving part 31 .

[0037] For example, a plurality of limiting grooves 311 are provided on the upper end surface of the driving portion 31 ; the driving member 6 is a spring, and one end of the spring is disposed in the limiting groove 311 .

[0038] When enough brake gas or brake oil is injected into the gas-liquid chamber 7 through the gas-liquid inlet and outlet 20 to increase the pressure in the gas-liquid chamber 7, the gas-liquid chamber 7 generates an upward reaction force on the lower side of the driving part 31. The reaction force overcomes the downward braking force generated by the driving part 6, and pushes the brake part 3 to move upward longitudinally in the guide cavity of the fixed seat 2 according to the brake part 32, so that the lower end of the brake part 32 leaves the inner edge of the first brake disc 4. At this time, the first brake disc 4 and the second brake disc 5 are longitudinally spaced apart and no contact or friction is generated, so that the CNC turntable is in a state where it can be rotated as needed.

[0039] When the CNC turntable rotates to the required processing position, it is necessary to use a braking device to stop and lock the spindle of the CNC turntable. At this time, the brake gas or brake oil in the gas-liquid chamber 7 flows out through the gas-liquid inlet and outlet 20 and flows back to the external gas source or oil source. The pressure in the gas-liquid chamber 7 is reduced, and the brake member 3 is pushed downward under the action of the downward braking force generated by a number of springs, so that the lower end of the braking part 32 is pressed down to the inner edge end of the first brake disc 4, driving the inner edge end of the first brake disc 4 to produce elastic deformation and move downward, so that the inner edge end of the first brake disc 4 abuts against the outer edge end of the second brake disc 5. Due to the large abutment area between the two, a large friction force can be quickly generated, so that the spindle of the CNC turntable can be braked quickly, the braking effect is good, and the large friction force can also match the requirements of the CNC turntable for heavy cutting work.

[0040] In order to further improve the braking effect, the braking device further includes a support seat 1 fixedly installed below the fixing seat 2 , and the first brake disc 4 and the second brake disc 5 are located between the fixing seat 2 and the support seat 1 .

[0041] By arranging the support seat 1 below the fixing seat 2, when the braking action is implemented, the lower end of the braking portion 32 abuts the inner edge end of the first brake disc 4 and the outer edge end of the second brake disc 5 against the support seat 1, which is conducive to quickly generating a large friction force between the inner edge end of the first brake disc 4 and the outer edge end of the second brake disc 5 to achieve braking.

[0042] In addition, in order to enhance the friction braking force between the first brake disc 4 and the second brake disc 5 to enhance the braking effect of the brake device, in some embodiments of the present invention, the first brake disc 4 comprises two pieces spaced apart longitudinally, and the outer edge end of the second brake disc 5 is located between the inner edge ends of the two pieces of the first brake disc 4.

[0043] When the brake device is used to brake the CNC turntable, the driving member 6 drives the brake part 32 to move downward longitudinally, and the lower end of the brake part 32 acts on the inner edge of the first brake disc 4, so that the outer edge of the second brake disc 5 is clamped between the outer edges of the two first brake discs 4, so that the upper and lower side surfaces of the outer edge of the second brake disc 5 respectively generate friction braking force with the inner edge of one of the first brake discs 4, thereby increasing the braking force to stop the second brake disc 5 from rotating instantly, thereby stopping the spindle of the CNC turntable from rotating and locking the position, thereby obtaining a better braking effect.

[0044] Of course, the second brake disc 5 can also be arranged to include two pieces arranged at a longitudinal interval, and the inner edge end of the first brake disc 4 is located between the outer edge ends of the two second brake discs 5. When braking, the outer edge ends of the two second brake discs 5 are respectively abutted against the upper and lower side surfaces of the inner edge end of the first brake disc 4 to generate friction braking force, which can also quickly generate a large friction braking force to obtain a better braking effect.

[0045] Furthermore, the gas-liquid cavity 7 is formed between the driving part 31 and the fixing seat 2. When the brake member 3 rises or falls longitudinally relative to the fixing seat 2, the distance between the driving part 31 and the fixing seat 2 will change, thereby causing the size of the gas-liquid cavity 7 to change. Therefore, ensuring that the gas-liquid cavity 7 has good sealing performance between the driving part 31 and the fixing seat 2 is conducive to improving the reliability of the brake device.

[0046] Specifically, a first sealing groove 321 is provided on the inner wall of the guide cavity or the outer wall of the brake portion 32 , and a first sealing ring 322 is provided in the first sealing groove to seal the gas-liquid cavity 7 at the joint gap between the guide cavity and the brake portion 32 .

[0047] In addition, a second sealing groove 323 and a third sealing groove 21 are respectively provided on the outer wall of the driving portion 32 and the outer wall of the fixing seat 2, and a second sealing ring 324 and a third sealing ring 22 are respectively provided in the second sealing groove 323 and the third sealing groove 21, so as to seal the gas-liquid chamber 7 from the outer wall of the driving portion 32 and the outer wall of the fixing seat 2 respectively.

[0048] As mentioned above, the brake device is installed inside the CNC turntable, the outer wall of the driving part 32 is sealed and connected to the inner wall of the housing of the CNC turntable through the second sealing ring 324, and the outer wall of the fixing seat 2 is sealed and connected to the inner wall of the housing of the CNC turntable through the third sealing ring 22, so that the gas-liquid cavity 7 formed between the driving part 31 and the fixing seat 2 becomes a closed space with good sealing performance, ensuring that the brake device has better structural reliability

[0049] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A brake device for a CNC turntable, characterized in that: The brake device comprises: A fixed seat having a longitudinal guide cavity; A brake component, comprising a brake part and a driving part connected to the brake part, wherein the brake part is located in the guide cavity; A first brake disc, the outer edge of which is fixedly connected to the fixing seat and the inner edge of which is located below the braking part; a second brake disc, arranged longitudinally spaced apart from the first brake disc, the outer edge of the second brake disc being located below the braking portion and overlapping with the inner edge of the first brake disc, the inner edge of the second brake disc extending into the guide cavity; A driving member, disposed on the driving portion to generate a downward braking force on the brake member; A gas-liquid cavity is formed between the driving portion and the fixing seat so as to generate an upward counter-braking force on the brake member when gas or liquid is injected into the gas-liquid cavity.

2. The brake device according to claim 1, characterized in that: The first brake disc includes two discs spaced apart in the longitudinal direction, and the outer edge end of the second brake disc is located between the inner edge ends of the two first brake discs.

3. The brake device according to claim 1, characterized in that: The second brake disc comprises two discs spaced apart in the longitudinal direction, and the inner edge end of the first brake disc is located between the outer edge ends of the two second brake discs.

4. The brake device according to claim 1, characterized in that: The driving part is in a circular ring shape, and a plurality of driving members are evenly spaced and arranged in a ring on the driving part.

5. The brake device according to claim 4, characterized in that: The upper end surface of the driving part is provided with a plurality of limiting grooves; the driving member is a spring, and one end of the spring is arranged in the limiting groove.

6. The brake device according to claim 1, characterized in that: A first sealing groove is provided on the inner wall of the guide cavity or the outer wall of the brake part, and a first sealing ring is provided in the first sealing groove to seal the gas-liquid cavity through the joint gap between the guide cavity and the brake part.

7. The brake device according to claim 1, characterized in that: A second sealing groove and a third sealing groove are respectively provided on the outer wall of the driving part and the outer wall of the fixing seat, and a second sealing ring and a third sealing ring are respectively provided in the second sealing groove and the third sealing groove to seal the gas-liquid cavity from the outer wall of the driving part and the outer wall of the fixing seat respectively.

8. The brake device according to claim 1, characterized in that: The upper end surface of the fixing seat is provided with a gas-liquid inlet and outlet communicated with the gas-liquid cavity.

9. The brake device according to claim 1, characterized in that: The upper end surface of the driving part is provided with a longitudinally extending positioning pin to limit the lateral rotation of the brake member.

10. The brake device according to any one of claims 1 to 9, characterized in that: It also includes a support seat fixedly installed below the fixing seat, and the first brake disc and the second brake disc are located between the fixing seat and the support seat.

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