Inching brake disc type braking device with angular balance function

Abstract

The utility model discloses a snub disc brake device with an angular balance function, and belongs to the technical field of brake equipment. The device comprises a plurality of damper brakes, an end cover of each damper brake is connected with a base frame to form a cavity, and a brake piston and an oil cylinder barrel are arranged in each cavity; one end of the transfer block is arranged in the cavity, the other end of the transfer block is in spherical hinge connection with the friction piece, and a first elastic piece is arranged on the transfer block; the brake piston and the base frame are matched to form a first sealing cavity and a first gap provided with a second elastic piece. One end of the adjusting sleeve is arranged outside the cavity, and the other end of the adjusting sleeve is arranged in the cavity, connected with the brake piston and in plane contact with the transfer block; one end of the oil cylinder piston and the oil cylinder barrel form a second sealing cavity, and the other end of the oil cylinder piston penetrates through the oil cylinder barrel to be in plane contact with the transfer block. According to the braking device, the multiple damper brakes are horizontally and symmetrically arranged, so that the braking device has the angular balance function, the speed can be automatically detected, snub braking can be conducted when the speed is too high, and galloping is prevented.

Description

TECHNICAL FIELD

[0001] The utility model belongs to brake equipment technical field, concretely is a point brake disc type brake device with angular balance function. BACKGROUND

[0002] The disc brake device is used for braking of the belt conveyor, and plays a vital role in safe parking of the belt conveyor. The existing brake is generally mainly applied to normal braking of the belt conveyor, but when the speed of the belt is too fast, the point brake cannot be applied, and the belt speed cannot be braked in advance, so that the speed of the belt is restored to normal. Moreover, due to installation error or improper installation and other factors, the brake disc will be inclined and shaken during braking, which not only affects the braking performance of the brake device, but also causes the brake piston to be impacted by alternating tangential force, shortens the service life of the sealing member and structural member, and even seriously damages the brake shoe, so that the brake device directly loses braking ability and causes a major accident.

[0003] Therefore, it is necessary to provide a point brake disc type brake device with angular balance function to solve the above technical problems in the prior art. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a point brake disc type brake device with angular balance function, which realizes point brake and braking functions, and can avoid damage of disc surface inclination and shaking of the brake disc to the brake shoe.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] A point brake disc type brake device with angular balance function, comprising a brake shoe and a brake disc, the brake disc is connected with the rotating shaft of the belt conveyor drum, at least one pair of brake shoes is symmetrically arranged on the left and right sides of the brake disc, each brake shoe comprises a base frame, an end cover, an adjusting sleeve, a transmission block and a friction member;

[0007] The end cover is connected with the base frame to form a cavity, a brake piston and an oil cylinder are arranged in the cavity;

[0008] One end of the transmission block is arranged in the cavity, the other end of the transmission block is connected with the friction member through the base frame, a first elastic member for resetting is arranged between the transmission block and the base frame;

[0009] The brake piston is in sliding fit with the base frame to form a first sealing cavity and a first gap, a second elastic member is arranged in the first gap;

[0010] One end of the adjusting sleeve is arranged outside the cavity through the end cover, the other end of the adjusting sleeve is arranged in the cavity and connected with the brake piston, and the adjusting sleeve is in plane contact with the transmission block;

[0011] The oil cylinder piston is arranged in the oil cylinder barrel, one end of the oil cylinder piston forms a second sealed cavity with the oil cylinder barrel, and the other end of the oil cylinder piston penetrates through the oil cylinder barrel and is in surface contact with the transmission block.

[0012] The first sealed cavity and the second sealed cavity are connected with a hydraulic station, the hydraulic station is connected with an electric control box, and the electric control box is connected with a speed detector.

[0013] Preferably, the inner part of the base frame is provided with a circular ring.

[0014] The circular ring is in sliding fit with the brake piston to form the first sealed cavity and the first gap.

[0015] Preferably, the gap fit is arranged between the adjusting sleeve and the base frame and between the transmission block and the base frame.

[0016] Preferably, the adjusting sleeve is threadedly connected with the brake piston.

[0017] Preferably, the friction member is composed of a brake seat, a brake pad and a retaining ring.

[0018] The brake seat is provided with a first recess on one side, and the retaining ring is arranged on the periphery of the first recess, and the first recess and the retaining ring are in spherical hinge connection with the transmission block.

[0019] The brake seat is provided with a brake pad on the other side for friction with the brake disc.

[0020] Preferably, the transmission block is composed of a flat plate arranged in the cavity, a connecting rod penetrating through the base frame and a ball head arranged outside the cavity.

[0021] One end of the connecting rod is connected with the flat plate, and the other end of the connecting rod is connected with the ball head.

[0022] The first elastic member is arranged on the flat plate.

[0023] The second recess is arranged on the end of the connecting rod close to the ball head, and the first recess, the second recess, the retaining ring and the ball head are in spherical hinge connection.

[0024] Preferably, the brake further comprises a first sealing member.

[0025] The first sealing member is arranged on the oil cylinder piston.

[0026] Preferably, the brake further comprises a second sealing member and a third sealing member.

[0027] The second sealing member is arranged on the circular ring.

[0028] The third sealing member is arranged on the brake piston.

[0029] Preferably, the brake further comprises a brake piston connector and an oil cylinder port connector.

[0030] One end of the brake piston connector is communicated with the hydraulic station, and the other end of the brake piston connector is communicated with the first sealed cavity.

[0031] The one end of the oil cylinder port joint is communicated with the hydraulic station, and the other end of the oil cylinder port joint is communicated with the second sealing cavity.

[0032] Preferably, the brake further comprises a screw rod;

[0033] The screw rod is arranged on the base frame, and the screw rod is located between the base frame and the brake seat.

[0034] Compared with the prior art, the utility model has the following beneficial effects:

[0035] As described above, the utility model discloses a kind of point brake disc type brake device with angular balance function, transmission block cooperates with base frame, so that tangential force is directly transmitted to base frame, can avoid that tangential force suffered by brake is transmitted to brake piston or oil cylinder piston, causes the damage of sealing element;Brake is through the ball head between brake seat and transmission block, so that brake pad and brake disc always keep the close parallel of brake pad and brake disc surface during friction process, avoid the damage of brake caused by the deflection of brake disc surface.The utility model discloses four brake by horizontal symmetry design, so that structure has angular balance function, guarantee brake paste disc, and the utility model can automatically detect speed simultaneously, when speed is too fast, point brake can be manually controlled or automatically carried out, prevent flying car. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be briefly introduced to the drawing needed to be used in the embodiment.

[0037] Figure 1 It is the structure schematic view of the point brake disc type brake device with angular balance function in the embodiment;

[0038] Figure 2 It is the structure schematic view of the brake in the embodiment;

[0039] Figure 3 It is the structure schematic view of the speedometer in the embodiment;

[0040] Figure 4 It is Figure 3 It is the partial enlarged view of A in the embodiment.

[0041] In the figure: 1, base; 2, brake; 201, end cover; 202, brake piston; 203, base frame; 204, second elastic member; 205, adjusting sleeve; 206, transmission block; 207, first elastic member; 208, first locking nut; 209, screw rod; 210, brake seat; 211, brake pad; 212, retaining ring; 213, brake piston joint; 214, oil cylinder port joint; 215, oil cylinder barrel; 216, oil cylinder piston; 217, first sealing member; 218, second sealing member; 219, third sealing member; 3, speedometer; 301, shaft sleeve; 302, first stop block; 303, mandrel; 304, transmission wheel; 305, bearing; 306, key; 307, speed measuring gear; 308, housing; 309, speed sensor; 310, cross beam; 311, second stop block; 4, brake disc; 5, stud bolt; 6, bracket. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all embodiments of the present application.

[0043] Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0044] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0045] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0046] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] Example

[0048] like Figures 1 to 4 As shown in the figure, this embodiment describes a point-brake disc brake device with angular balancing function, mainly used for drum braking of belt conveyors in the field of bulk material conveying, to realize normal braking, overspeed braking and emergency stop braking of belt conveyors. The braking device includes a base 1, brake 2, brake disc 4 and speed sensor 3. The brake disc 4 is connected to the shaft of the belt conveyor drum, and at least one pair of brake 2 are symmetrically arranged on the left and right sides of the brake disc 4.

[0049] Each brake 2 includes a base frame 203, an end cap 201, an adjusting sleeve 205, a transmission block 206, and a friction element. The end cap 201 is connected to the base frame 203 to form a cavity, within which a brake piston 202 and a hydraulic cylinder 215 are disposed. One end of the transmission block 206 is disposed within the cavity, and the other end of the transmission block 206 passes through the base frame 203 and is ball-jointed to the friction element. The brake piston 202 and the base frame 203 slide together to form a first sealing cavity and a first gap, within which a second elastic element 204 is disposed. One end of the adjusting sleeve 205 passes through the end cap 201 and is disposed outside the cavity, while the other end of the adjusting sleeve 205 is disposed within the cavity and is threadedly connected to the brake piston 202. A piston 216 is installed inside the cylinder barrel 215. One end of the piston 216 forms a second sealed cavity with the cylinder barrel 215, and the other end of the piston 216 passes through the cylinder barrel 215 and contacts the plane of the transmission block 206. A first elastic element 207 for resetting is provided between the transmission block 206 and the base frame 203. Both the first and second sealed cavities are connected to a hydraulic station, which is connected to an electrical control box, which is connected to a speed detector 3.

[0050] In this embodiment, a bracket 6 is provided at each end of the base 1. A brake 2 is provided on the left and right sides of each bracket 6, and the brake 2 is fixed to the bracket 6 by double-headed bolts 5. A brake disc 4 is provided between the left and right brake 2, and the brake disc 4 and the shaft of the belt conveyor drum are fixedly connected to each other by a key or expansion sleeve, so that the brake disc 4 can rotate with the belt tensioning drum. When braking is required, the brake 2 is pushed out, and the brake disc 4 is gripped by friction, thereby braking the belt conveyor.

[0051] The friction part includes a brake seat 210, a brake pad 211 and a retaining ring 212. The brake seat 210 is provided with a first recess on one side, and the retaining ring 212 is arranged on the periphery of the first recess. The brake pad 211 is arranged on the other side of the brake seat 210 for friction with the brake disc 4.

[0052] The end cover 201 is connected and fixed to the base frame 203 by bolts. The base frame 203 is internally provided with a circular ring, which is in sliding fit with the brake piston 202 and the inner wall of the base frame 203, thereby forming a first sealing cavity and a first gap. The brake piston connector 213 is arranged on the first sealing cavity. One end of the brake piston connector 213 is communicated with the hydraulic station, and the other end of the brake piston connector 213 is communicated with the first sealing cavity. The second elastic member 204 is arranged in the first gap. In this embodiment, the second elastic member 204 is a disc spring. When the hydraulic station injects oil into the first sealing cavity, the disc spring is compressed, thereby moving the brake piston 202 to the left.

[0053] The transmission block 206 is arranged in the cavity on one end, and is connected with the first recess of the friction part and the retaining ring 212 to form a spherical hinge connection through the base frame 203 on the other end, and is in clearance fit between the transmission block 206 and the base frame 203. The transmission block 206 includes a flat plate arranged in the cavity, a connecting rod penetrating through the base frame 203 and a ball head arranged outside the cavity. One end of the connecting rod is connected with the flat plate, and the other end of the connecting rod is connected with the ball head. The flat plate is provided with the first elastic member 207, which is used for resetting the brake 2 after opening the brake. In this embodiment, the first elastic member 207 is a spring. The end of the connecting rod close to the ball head is provided with a second recess, and the first recess, the second recess, the retaining ring 212 and the ball head form a spherical hinge connection, which ensures that the contact surface is in close contact and has no eccentric wear phenomenon. The retaining ring 212 and the brake seat 210 are connected by bolts, which ensures that the ball head of the transmission block 206 will not be pulled out of the brake seat 210. There is a certain gap between the retaining ring 212 and the ball head.

[0054] The adjusting sleeve 205 is sleeved outside the brake piston 202 and is used for adjusting the opening clearance. One end of the adjusting sleeve 205 is arranged outside the cavity through the end cover 201, the other end of the adjusting sleeve 205 is arranged inside the cavity and is in threaded connection with the brake piston 202, the right end surface of the adjusting sleeve 205 is in plane contact with the left end surface of the transmission block 206, and the adjusting sleeve 205 is in clearance fit with the base frame 203. By the threaded connection between the adjusting sleeve 205 and the brake piston 202, the moving range of the transmission block 206 to the left and right can be adjusted, and then the opening clearance, that is, the distance between the brake pad 211 and the brake disc 4 after the brake is opened, can be adjusted. By injecting oil into the first sealing cavity through the hydraulic station, the disc spring is compressed, the brake piston 202 moves to the left, and since the adjusting sleeve 205 is in threaded connection with the brake piston 202, the adjusting sleeve 205 moves to the left along with the brake piston 202. Under the action of the spring rebound force, the transmission block 206 drives the brake seat 210 and the brake pad 211 to move to the left through the check ring 212, the brake pad 211 moves away from the brake disc 4, and the brake 2 is opened. When the first sealing cavity starts to leak, under the action of the disc spring rebound force, the brake piston 202 and the adjusting sleeve 205 move to the right, and then drive the transmission block 206 to move to the right, the transmission block 206 drives the brake pad 211 through the brake seat 210, so that the brake pad 211 is in friction with the brake disc 4, a braking force is provided, and the braking process is completed.

[0055] The oil cylinder barrel 215 is arranged inside the adjusting sleeve 205 and is fixedly connected with the base frame 203. The oil cylinder barrel 215 is provided with an oil cylinder piston 216, one end of the oil cylinder piston 216 forms a second sealing cavity with the oil cylinder barrel 215, and the other end of the oil cylinder piston 216 is in plane contact with the transmission block 206 through the oil cylinder barrel 215. The oil cylinder port connector 214 is arranged on the oil cylinder barrel 215, one end of the oil cylinder port connector 214 is connected with the hydraulic station, and the other end of the oil cylinder port connector 214 is connected with the second sealing cavity. The left end surface of the transmission block 206 is in plane contact with the right end surface of the oil cylinder piston 216.

[0056] The embodiment further comprises a first sealing element 217, a second sealing element 218 and a third sealing element 219. The first sealing element 217 is arranged on the oil cylinder piston 216, and the first sealing element 217, the oil cylinder barrel 215 and the oil cylinder piston 216 cooperate to form the second sealing cavity. The second sealing element 218 is arranged on the circular ring, and the third sealing element 219 is arranged on the brake piston 202. The second sealing element 218, the third sealing element 219, the circular ring and the brake piston 202 cooperate to form the first sealing cavity.

[0057] The embodiment is provided with a screw rod 209 on the base frame 203, the screw rod 209 is locked on the base frame 203 through the first locking nut 208, so as to avoid loosening of the screw rod 209. The screw rod 209 is located between the base frame 203 and the brake seat 210 and is in threaded connection with the base frame 203, so as to ensure that there is no eccentric wear after the brake is opened.

[0058] The spindle 303 of the tachometer 3 is installed in the casing 308 through the bearing 305 and can rotate, the transmission wheel 304 and the tachometer gear 307 are fixed with the spindle 303 through the key 306 and rotate simultaneously, and the tachometer sensor 309 is fixed on the casing 308 through the second locking nut. The first stopper 302 is arranged on the transmission wheel 304, so that the spindle 303 can rotate but cannot move left and right. The casing 308 is hinged to the crossbeam 310 and has the second stopper 311 on both sides, so that the casing 308 can rotate around the crossbeam 310 but cannot move left and right.

[0059] During operation, the upper end crossbeam 310 of the tachometer 3 is fixed with the middle frame of the belt conveyor, the transmission wheel 304 is placed on the upper surface of the lower belt of the belt conveyor, the transmission wheel 304 and the belt form a friction force by using the gravity of the tachometer 3, when the belt runs, the transmission wheel 304 is driven to rotate, and then the tachometer gear 307 is driven to rotate, when the tooth top and tooth root of the tachometer gear 307 pass through the tachometer sensor 309 alternately, an alternating magnetic field is generated, so that the tachometer sensor 309 generates an induced voltage, the higher the speed is, the stronger the induced electromotive force is, and the induced voltage is transmitted to the electric control box through the control cable and is converted into a speed signal.

[0060] The tachometer 3 detects the speed of the belt conveyor, when the speed is greater than a given value, the hydraulic station supplies oil into the second sealed cavity, the oil cylinder piston 216 moves to the right, so that the transmission block 206 pushes the brake shoe 211 through the brake seat 210, the brake shoe 211 rubs against the brake disc 4 to provide a braking force. The tachometer 3 continuously detects the speed, when the speed is less than the given value, the electric control box opens the oil discharge circuit to discharge oil from the second sealed cavity, under the action of the spring rebound force, the transmission block 206 drives the brake seat 210 and the brake shoe 211 to move to the left through the check ring 212, the brake shoe 211 moves away from the brake disc 4, the loss of power time and the loss of power frequency controlled by the electric control box are used to control the point brake. When the belt conveyor runs, the tachometer 3 continuously detects the speed of the belt conveyor, the speed signal is transmitted to the control system through the electric control box, when the speed is greater than the given value, the point brake process is repeated until the speed is less than the given value, and the point brake process is completed.

[0061] The working process of the point brake disc type brake device with the angular balance function in the embodiment is briefly described as follows:

[0062] Starting process: the hydraulic station supplies oil into the first sealed cavity through the brake piston joint 213, at this time, the disc spring is compressed, the brake piston 202 and the adjusting sleeve 205 move to the left under the action of the oil pressure, the spring gradually recovers under the action of the spring rebound force, drives the transmission block 206 to move to the left, the ball head is close to the check ring 212, and then drives the brake seat 210 and the brake shoe 211 to move to the left and away from the brake disc 4; at this time, the brake brake 2 is in the open brake state, when the brake seat 210 deflects around the ball head, the brake seat 210 automatically touches the screw rod 209, so that the brake shoe 211 is in the vertical state.

[0063] Point brake process: when the belt conveyor runs too fast during the working process, point brake is needed to make the belt speed return to normal. When the speed detector 3 detects that the speed is greater than the given value, the hydraulic station supplies oil to the second sealed cavity through the oil cylinder port joint 214, the oil cylinder piston 216 pushes the transmission block 206 to move to the right, the brake pad 211 constantly approaches the brake disc 4 and rubs with the brake disc 4 to provide braking force; when the speed detector 3 detects that the speed is less than the given value, the electric control box opens the oil drain circuit to drain oil from the second sealed cavity. Under the action of the spring, the transmission block 206 drives the brake shoe 210 and the brake pad 211 through the check ring 212, the brake pad 211 leaves the brake disc 4, and the point brake process is completed. The speed detector 3 continuously detects the speed, and when the speed is greater than the given value, the above point brake process is continuously repeated until the belt speed is less than or equal to the given value.

[0064] Braking process: the hydraulic station opens the oil drain circuit to drain oil from the first sealed cavity. Under the action of the disc spring rebound force, the transmission block 206 pushes the brake pad 211 through the brake shoe 210, the brake pad 211 rubs with the brake disc 4 to provide braking force, and the braking process is completed.

[0065] The brake device in the embodiment is double-cylinder double-action, can realize point brake and braking functions, and through the horizontal symmetrical design of the four brake shoes 2, the structure has angular balance function, and the brake shoe 2 is guaranteed to be attached to the disc.

[0066] The brake device in the embodiment can automatically detect the speed, and when the speed is too fast, the point brake can be manually controlled or automatically performed to prevent the vehicle from flying; the transmission block 206 cooperates with the base frame 203, and the tangential force is directly transmitted to the base frame 203, avoiding that the tangential force borne by the brake shoe 2 is transmitted to the brake piston 202 or the oil cylinder piston 216, causing damage to the sealing element; the brake shoe 2 passes through the spherical surface between the transmission block 206 and the brake shoe 210, so that the brake pad 211 and the brake disc 4 are always kept in close parallel during the friction process, avoiding damage of the brake disc 4 disc surface to the brake shoe 2.

[0067] The disc brake device in the embodiment can be replaced by a wheel brake device or a drum brake device; the disc spring can be replaced by a spring, polyurethane rubber or other elastic components; the oil cylinder barrel 215 and the oil cylinder piston 216 can be replaced by an electric push rod, an air cylinder or other components that can apply braking force; the ball hinge structure can be replaced by a hinge, a floating compression device or the like.

[0068] The embodiments of the utility model are only used for explaining the technical scheme of the utility model and are not limited, and for the ordinary skilled in the art, can understand that these embodiments can be changed, modified, replaced and changed in a plurality of ways without departing from the principles and spirits of the utility model, and the range of the utility model is defined by the appended claims and its equivalents.

Claims

1. A point-braking disc brake device with angular balancing function, characterized in that, The brake disc is connected with the rotating shaft of the belt conveyor roller, and at least one pair of brake shoes is symmetrically arranged on the left and right sides of the brake disc. The end cover is connected with the base frame to form a cavity, and a brake piston and a cylinder barrel are arranged in the cavity. One end of the transmission block is arranged in the cavity, and the other end of the transmission block is connected with the friction ball hinge through the base frame, and a first elastic element for resetting is arranged between the transmission block and the base frame. The brake piston and the base frame are in sliding fit to form a first sealed cavity and a first gap, and a second elastic element is arranged in the first gap. One end of the adjusting sleeve is arranged outside the cavity through the end cover, and the other end of the adjusting sleeve is arranged in the cavity and connected with the brake piston, and the adjusting sleeve is in plane contact with the transmission block. An oil cylinder piston is arranged in the oil cylinder barrel, one end of the oil cylinder piston forms a second sealed cavity with the oil cylinder barrel, and the other end of the oil cylinder piston is in plane contact with the transmission block through the oil cylinder barrel. The first sealed cavity and the second sealed cavity are connected with a hydraulic station, the hydraulic station is connected with an electric control box, and the electric control box is connected with a speed detector.

2. A point brake apparatus having a corner balancing function according to claim 1, wherein The inside of the base frame is provided with a circular ring. The circular ring and the brake piston are in sliding fit to form a first sealed cavity and a first gap.

3. The point brake apparatus according to claim 1, wherein The adjusting sleeve and the base frame, and the transmission block and the base frame are in clearance fit.

4. The point brake apparatus according to claim 1, wherein The adjusting sleeve is threadedly connected with the brake piston.

5. The point brake apparatus according to claim 1, wherein The friction piece is composed of a brake seat, a brake pad and a retaining ring; One side of the brake seat is provided with a first recess, and the periphery of the first recess is provided with a retaining ring, and the first recess, the retaining ring and the transmission block form a ball hinge connection; The other side of the brake seat is provided with a brake pad for friction with the brake disc.

6. A point brake apparatus having a corner balancing function according to claim 5, wherein The transmission block is composed of a flat plate arranged in the cavity, a connecting rod penetrating the base frame and a ball head arranged outside the cavity; One end of the connecting rod is connected with the flat plate, and the other end of the connecting rod is connected with the ball head; The first elastic element is arranged on the flat plate; The first recess, the second recess, the retaining ring and the ball head form a ball hinge connection.

7. The point brake apparatus according to claim 1, wherein The brake shoe further comprises a first sealing element; The first sealing element is arranged on the oil cylinder piston.

8. The point brake apparatus according to claim 2, wherein The brake shoe further comprises a second sealing element and a third sealing element; The second sealing element is arranged on the circular ring; The third sealing element is arranged on the brake piston.

9. The point brake apparatus according to claim 1, wherein The brake shoe further comprises a brake piston connector and an oil cylinder port connector; One end of the brake piston connector is connected with the hydraulic station, and the other end of the brake piston connector is connected with the first sealed cavity; One end of the oil cylinder port connector is connected with the hydraulic station, and the other end of the oil cylinder port connector is connected with the second sealed cavity.

10. The point brake apparatus according to claim 1, wherein The brake shoe further comprises a screw rod; The screw rod is arranged on the base frame, and the screw rod is located between the base frame and the brake seat.

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