Pneumatic clutch brake

Abstract

The utility model relates to a pneumatic clutch brake which is improved on the basis of an existing air cylinder, an output shaft sleeve, a base, a piston with a through hole, a spring, a first friction block, a second friction block, a first brake plate, a second brake plate and the like, namely, the through hole is formed in an installation portion, located in an inner cavity, of the piston, and a guide column is located in the inner cavity. And a middle sealing ring matched with the guide post is arranged on the edge of the through hole of the piston. Due to the fact that the guide column deviates inwards into the inner cavity, under the same appearance, the inner cavity can be made to be larger, namely the outer diameter of the inner cavity can be increased, the area of the air cylinder can be increased, the thrust of air pressure can be increased, finally the clutch torque can be increased, and the clutch performance of a product can be obviously improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a clutch brake, in particular to a pneumatic clutch brake. Background Art

[0002] A pneumatic clutch brake is a clutch device that connects via air pressure and brakes with a return spring. It is widely used due to its advantages, including gentle starting, smooth stopping, and simple heat recovery. Currently, the structure of pneumatic clutch brakes is diverse. For example, Chinese Patent Publication No. CN202659760U discloses a pneumatic clutch brake comprising a clutch body (also known as a base), a body seat (also known as an output shaft sleeve) supporting the clutch body, a cylinder, a piston assembly, and a guide post (also known as a guide post). The clutch body is detachably mounted on the body seat, facilitating replacement and maintenance. The body seat is mounted on one end of the cylinder, and a housing is formed between the clutch body and the cylinder. The housing contains the piston assembly. The piston assembly and the corresponding body portion of the piston assembly are evenly distributed around the piston assembly. The return springs are placed within the return spring housing and are used to return the piston assembly. The clutch body, cylinder, and piston assembly are connected by a guide post, which is secured at both ends with anti-loosening bolts. The two end surfaces of the piston assembly are also in contact with the first friction block and the second friction block. The first friction block and the second friction block are respectively arranged on the ends of the first brake plate and the second brake plate. The first brake plate is fixed to the brake fixing bracket by screws, and the second brake plate is fixed to the flywheel by screws.

[0003] While the aforementioned pneumatic clutch brake can achieve the goal of "clutching" or "closing" the master and slave components, the pneumatic clutch brake has a large number of guide posts, which are circumferentially spaced around the periphery of the containment cavity. Consequently, for a given external shape, the cylinder's major diameter (i.e., the major diameter of the containment cavity) is relatively small. The clutch torque is primarily determined by the difference between the air pressure thrust and the spring thrust, the friction radius, and the friction system, with the air pressure thrust being related to the major diameter of the cavity. Therefore, the clutch torque of existing pneumatic clutches needs to be further improved. Furthermore, if the clutch brake is still used during use when the friction blocks are excessively worn, it can easily damage the clutch brake, necessitating further protective measures. Utility Model Content

[0004] The first technical problem to be solved by the present invention is to provide a pneumatic clutch brake which can improve the clutch torque under the same conditions in view of the current status of the existing technology.

[0005] The second technical problem to be solved by the present invention is to provide a pneumatic clutch brake which can improve the clutch torque and prolong the service life in view of the current status of the existing technology.

[0006] The technical solution adopted by the present invention to solve the above technical problems is as follows: a pneumatic clutch brake, comprising a cylinder, an output shaft sleeve and a base, wherein the cylinder and the base are respectively fixed at both ends of the output shaft sleeve, and the three together enclose an inner cavity with a circumferential opening, a piston which is sleeved on the output shaft sleeve and can move axially is provided in the inner cavity, and an outer sealing ring and an inner sealing ring are provided on the piston to cooperate with the corresponding inner wall of the inner cavity to form a sealed air cavity in the inner cavity, the outer edge of the piston can extend out of the opening of the inner cavity, and the two end surfaces of the outer edge of the piston can respectively The first friction block and the second friction block are in contact with each other, and the first friction block and the second friction block are respectively arranged on the first brake plate and the second brake plate. A spring is also provided in the inner cavity, which is in contact with the piston and makes the piston always have a tendency to move toward the sealed air cavity side. At the same time, a guide column is provided, which passes through the through hole on the piston and is constrained on the cylinder and the base. It is characterized in that: the through hole is located on the installation part of the piston in the inner cavity, the guide column is located in the inner cavity, and an intermediate sealing ring matching the guide column is provided on the edge of the through hole of the piston.

[0007] In the above solution, a further improvement is that the mouth of the inner cavity is provided with a first stopper and a second stopper, respectively corresponding to the end surfaces of the outer edge of the piston. Before the first and second friction blocks are completely worn, the first and second stops respectively abut the corresponding end surfaces of the outer edge of the piston. During use, when the first and second friction blocks are worn to a certain thickness, the piston moves in the corresponding direction and directly abuts the first or second stopper, causing the "disengage" or "engage" working condition to fail. This can promptly remind the user to replace the corresponding friction block, effectively preventing damage to the clutch brake and thus extending its service life.

[0008] In the above-mentioned schemes, it is further preferred that the cross-sections of the inner and outer sealing rings and the middle sealing ring are designed to be U-shaped structures or Y-shaped structures, and the relatively thin sealing ring lips of the U-shaped structure or Y-shaped structure are utilized so that the compressed air in the sealing air cavity can press the lips tightly against the corresponding wall surface, thereby helping to improve the sealing performance of the sealing air cavity.

[0009] Preferably, the base and the output shaft sleeve are designed as an integral part to improve the strength and reliability of the product.

[0010] In the above schemes, it is preferable that the outer end surfaces of the base and the cylinder are provided with radially extending heat dissipation ribs distributed at intervals along the circumference. The use of the heat dissipation ribs can improve the heat dissipation performance and prevent the product from overheating.

[0011] In order to ensure the strength of the guide column and facilitate its stability after installation, a further improvement is that a hollow mounting column is provided on the inner wall of the base, and the middle section of the guide column is designed to be a large diameter section and a small diameter section, the large diameter section is inserted in the through hole of the piston, and the small diameter section is inserted in the mounting column.

[0012] To further increase clutch torque, the first friction blocks are provided in pairs, fixed to the first inner brake plate and the first outer brake plate, respectively. These two plates form the first brake plate. A first transmission plate meshes with the ring gear on the outer circumference of the cylinder and is sandwiched between the two first friction blocks. Similarly, the second friction blocks are provided in pairs, fixed to the second inner brake plate and the second outer brake plate, respectively. These two plates form the second brake plate. A second transmission plate meshes with the ring gear on the outer circumference of the base and is sandwiched between the two second friction blocks.

[0013] Compared with the prior art, since the guide column in the present invention is offset inward into the inner cavity, the inner cavity can be made larger under the same appearance, that is, the outer diameter of the inner cavity can be increased, thereby increasing the area of the cylinder, increasing the thrust of the atmospheric pressure, and ultimately increasing the clutch torque, thereby significantly improving the clutch performance of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0015] Figure 2 for Figure 1 An enlarged schematic diagram of part I in FIG;

[0016] Figure 3 for Figure 1 Schematic diagram of the left side. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0018] like Figures 1 to 3 As shown, the pneumatic clutch brake in this embodiment is a large clutch brake, which is mainly used in high-speed punching machines and other equipment. Specifically, it includes a cylinder 1, an output shaft sleeve 21 and a base 22, a piston 3 and a guide column 4, wherein the cylinder 1 and the base 22 are respectively fixed to the two ends of the output shaft sleeve 21. Figure 1 In order to improve the strength and reliability of the product, the base 22 and the output shaft sleeve 21 are cast into an integral part 2, and the cylinder 1 is fixed to the integral part 2 with a plurality of bolts A evenly spaced along the circumference. In this way, the cylinder 1 and the integral part 2 together enclose an inner cavity, which has the following characteristics: Figure 1 The cylinder has a large diameter D1 and a small diameter D2, and the inner cavity is further formed with a mouth B in the circumferential direction. The mouth B is formed by the gap between the cylinder 1 and the base 22.

[0019] The piston 3 is located in the inner cavity and is sleeved on the output shaft sleeve 21 so as to be able to move axially in the inner cavity. The piston 3 is provided with an outer sealing ring 5a and an inner sealing ring 5b which cooperate with the corresponding inner wall of the inner cavity to form a sealed air cavity C in the inner cavity. Figure 1 It can be seen that the outer sealing ring 5a cooperates with the side wall of the cylinder 1, and the inner sealing ring 5b cooperates with the output shaft sleeve 21. The output shaft sleeve 21 is provided with an air passage 211 connected to the sealed air chamber C. The outer edge of the piston 3 can extend out of the mouth B of the inner chamber, and the two end faces of the outer edge of the piston 3 can also contact the first friction block 6a and the second friction block 6b respectively. The first friction block 6a is set on the first brake plate 7a, and the second friction block 6b is set on the second brake plate 7b. The first brake plate 7a and the second brake plate 7b are respectively fixed to the frame of the equipment (not shown in the figure) and the flywheel (not shown in the figure). In order to increase the clutch torque, Figure 1 In the embodiment, two first friction blocks 6a are designed, fixed to the first brake inner plate 71a and the first brake outer plate 72a, respectively. These first brake inner plate 71a and the first brake outer plate 72a constitute the first brake plate 7a. A first transmission plate 8a is also provided. This first transmission plate 8a meshes with the ring gear on the outer circumference of the cylinder 1 and is sandwiched between the two first friction blocks 6a. Similarly, two second friction blocks 6b are also provided, fixed to the second brake inner plate 71b and the second brake outer plate 72b, respectively. These second brake inner plate 71b and the second brake outer plate 72b constitute the second brake plate 7b. A second transmission plate 8b is also provided. This second transmission plate 8b is sandwiched between the two second friction blocks 6b and meshes with the ring gear on the outer circumference of the base 22.

[0020] As in the prior art, the inner cavity is also provided with a spring 9 which abuts against the piston 3 and makes the piston always have a tendency to move toward the sealed air cavity. There are also multiple springs 9 which are evenly spaced along the circumference. Figure 1 In the embodiment, each spring 9 is sleeved on the positioning pin 221, and the positioning pin 221 is fixed on the base 22, so that each spring 9 is stably arranged and works more reliably.

[0021] The guide column 4 passes through the through hole 31 on the piston 3 and is constrained on the cylinder 1 and the base 22. Figure 1 and Figure 2It can be seen that the guide column 4 in this embodiment is located in the inner cavity, and accordingly, the through hole 31 is located on the installation portion of the piston 3 in the inner cavity, and considering the strength of the guide column 4 and the convenience of installation, a hollow installation column 222 is provided on the inner wall of the base 22, and the middle section of the guide column 4 is designed to be a large diameter section 41 and a small diameter section 42. The large diameter section 41 of the guide column is inserted into the through hole 31 of the piston, and the small diameter section 42 of the guide column is inserted into the installation column 222. The two ends of the guide column 4 pass through the corresponding installation holes on the base 22 and the cylinder 1 and are fastened with locking nuts.

[0022] Because piston 3 needs to move axially relative to guide post 4, to ensure the sealing performance of the sealed air chamber C, an intermediate sealing ring 5c is provided on the edge of through-hole 31 of piston 3 to cooperate with guide post 4. In this embodiment, the inner sealing ring 5b, outer sealing ring 5a, and intermediate sealing ring 5c are all designed with U-shaped or Y-shaped cross-sections and are all made of perfluoroelastomer.

[0023] In this way, when compressed air enters the sealed air chamber C through the air passage 211 on the output shaft sleeve 21, the lips of the inner and outer sealing rings and the middle sealing ring of the U-shaped structure (or Y-shaped structure) can automatically adhere to the corresponding wall surfaces under the action of air pressure, thereby effectively improving the sealing performance of the sealed air chamber C and extending its service life. At the same time, the air in the sealed air chamber will overcome the force of the spring 9 and push the piston to the right. Then the outer edge of the piston will separate from the first friction block and press the second friction block against the flywheel until it locks with the flywheel. Driven by the flywheel, the clutch brake rotates and enters the "closed" state. Conversely, when the sealed air chamber is blocked by compressed air, the piston moves to the left under the action of the spring restoring force, releasing the second friction block and turning to press the first friction block until it locks with the frame and disengages from the flywheel. The flywheel rotates idly and the clutch brake enters the "open" braking state.

[0024] Under the above-mentioned multiple actions of the clutch brake, the first and second friction blocks will inevitably wear out. When the wear is too great, continuing to use the clutch brake will cause damage to the product. For this reason, in this embodiment, the mouth B of the inner cavity is respectively provided with a first stopper 10a and a second stopper 10b corresponding to the two end faces of the outer edge of the piston 3. Before the first friction block 6a and the second friction block 6b are completely worn out, the first stopper 10a and the second stopper 10b respectively abut against the corresponding end faces of the outer edge of the piston. That is, when the first and second friction blocks are worn to a certain thickness, when the piston 3 moves to the left or right, it will directly abut against the first stopper or the second stopper, making the "off" working condition or the "on" working condition invalid, thereby reminding the user to replace the corresponding friction block in time.

[0025] Since the clutch brake generates a lot of heat during operation, in order to dissipate the heat in time, in this embodiment, radially extending heat dissipation ribs are provided on the outer end surface of the base 22 and the cylinder 1 and are spaced apart along the circumference. Figure 3 The figure shows heat dissipation ribs 11 on the outer end surface of the cylinder. These ribs increase the surface area of the base and cylinder, preventing the clutch brake from overheating, ensuring stable performance and a long service life. Trials on a high-speed punch press have shown that the clutch brake of this embodiment can significantly improve the punching performance of the press.

Claims

1. A pneumatic clutch brake, comprising a cylinder (1), an output shaft sleeve (21) and a base (22), wherein the cylinder (1) and the base (22) are respectively fixed at both ends of the output shaft sleeve (21), and the three together enclose an inner cavity with a circumferential opening (B), wherein a piston (3) is provided in the inner cavity and is sleeved on the output shaft sleeve (21) and can move axially, wherein the piston (3) is provided with an outer sealing ring (5a) and an inner sealing ring (5b) which cooperate with the corresponding inner wall of the inner cavity to form a sealed air cavity (C) in the inner cavity, and the outer edge of the piston (3) can extend out of the inner cavity. The mouth of the inner cavity, and the two end surfaces of the outer edge of the piston (3) can respectively contact the first friction block (6a) and the second friction block (6b), and the first friction block and the second friction block are respectively arranged on the first brake plate (7a) and the second brake plate (7b), and the inner cavity is also provided with a spring (9) that abuts against the piston (3) so that the piston (3) always has a tendency to move toward the sealed air cavity side, and is also provided with a guide column (4), which passes through the through hole (31) on the piston (3) and is constrained on the cylinder (1) and the base, characterized in that: The through hole is located on the mounting portion of the piston (3) in the inner cavity, the guide column (4) is located in the inner cavity, and an intermediate sealing ring (5c) matching the guide column (4) is provided on the edge of the through hole (31) of the piston (3).

2. The pneumatic clutch brake according to claim 1, characterized in that: A first stopper (10a) and a second stopper (10b) corresponding to the two end faces of the outer edge of the piston (3) are respectively provided on the mouth (B) of the inner cavity. Before the first friction block and the second friction block are completely worn out, the first stopper (10a) and the second stopper (10b) respectively abut against the corresponding end faces of the outer edge of the piston (3).

3. The pneumatic clutch brake according to claim 1, characterized in that: The cross sections of the inner sealing ring (5b), the outer sealing ring (5a) and the middle sealing ring (5c) are all designed to be U-shaped or Y-shaped.

4. The pneumatic clutch brake according to claim 1, 2 or 3, characterized in that: The base (22) and the output shaft sleeve (21) are designed as an integral part (2).

5. The pneumatic clutch brake according to claim 1, 2 or 3, characterized in that: The outer end surfaces of the base and the cylinder (1) are both provided with radially extending heat dissipation ribs distributed at intervals along the circumferential direction.

6. The pneumatic clutch brake according to claim 1, 2 or 3, characterized in that: A hollow mounting column (222) is provided on the inner wall of the base, and the middle section of the guide column (4) is designed to be a large diameter section (41) and a small diameter section (42), the large diameter section (41) is inserted into the through hole of the piston (3), and the small diameter section (42) is inserted into the mounting column (222).

7. The pneumatic clutch brake according to claim 1, 2 or 3, characterized in that: There are two first friction blocks (6a), which are fixed on the first brake inner plate (71a) and the first brake outer plate (72a) respectively. The first brake inner plate (71a) and the first brake outer plate (72a) constitute the first brake plate (7a). At the same time, a first transmission plate (8a) is additionally provided, which is meshed with the gear ring on the outer peripheral surface of the cylinder (1). The first transmission plate (8a) is sandwiched between the two first friction blocks (6a).

8. The pneumatic clutch brake according to claim 7, characterized in that: There are also two second friction blocks (6b), which are fixed on the second brake inner plate (71b) and the second brake outer plate (72b) respectively. The second brake inner plate (71b) and the second brake outer plate (72b) constitute the second brake plate (7b). At the same time, a second transmission plate (8b) is additionally provided, which is meshed with the gear ring on the outer peripheral surface of the base (22). The second transmission plate (8b) is clamped between the two second friction blocks (6b).

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