Single-acting cylinder for magnetic track brake

Abstract

The invention relates to a single-action cylinder for a magnetic track brake, which comprises a cylinder body, a piston, a piston rod and an end cover, the end cover is arranged at the end of the cylinder body to enable the cylinder body to form a closed cavity, the piston is arranged in the cylinder body, and the piston rod extends into the cylinder body from the outer side of the end cover and is connected with the piston. A sealing ring is arranged on the periphery of the piston and divides the cylinder body into an elastic cavity and an air inflation cavity which are isolated from each other, the elastic cavity is provided with an elastic piece which abuts against the inner wall of the cylinder body and the piston, an air inflation opening is formed in an end cover at the end, away from the piston rod, of the cylinder body, and the air inflation opening is communicated with the air inflation cavity. A connecting portion is arranged at the end of the piston rod, the connecting portion can move relative to the outside when connected with the outside, the single-acting air cylinder for the magnetic track brake is designed and installed on the lower portions of two side frames of a bogie of the metro vehicle according to the characteristics of the metro vehicle, the single-acting air cylinder is arranged between two wheels on the same side, and the single-acting air cylinder has the advantages of being high in strength, large in thrust and variable in direction.

Description

Technical Field

[0001] This invention relates to the field of cylinder technology, and in particular to a single-acting cylinder for a magnetic rail brake. Background Technology

[0002] A single-acting cylinder is a pneumatic actuator that drives the piston in only one direction using compressed air, while reversing motion is achieved by spring force, gravity, or other external forces. Its working principle is as follows: when compressed air enters the rodless chamber, the gas pressure pushes the piston towards the rod chamber, extending the piston rod. At this time, the spring is compressed (or a reserve reversing force is utilized, such as by the load or gravity). When the rodless chamber exhausts air, the piston moves in the opposite direction under the spring force (or other external forces), retracting the piston rod and completing one working cycle.

[0003] Currently, single-acting cylinders are only suitable for scenarios where the thrust / tension requirements are not high and only unidirectional action is required, such as clamping devices, small valve opening and closing, and material pushing. The single-acting cylinders currently on the market do not meet the cylinder requirements of high-suspension magnetic rail brakes for subway vehicles, such as high thrust, high strength, and variable direction. Therefore, the engineering integration and application demonstration research of single-acting cylinder technology with high thrust and variable direction suitable for subway vehicles has a very strong and urgent practical significance. Summary of the Invention

[0004] The purpose of this invention is to overcome the defects existing in the prior art and provide a single-acting cylinder for a magnetic track brake.

[0005] To achieve the above objectives, the technical solution of the present invention is to design a single-acting cylinder for a magnetic track brake, comprising a cylinder body, a piston, a piston rod, and an end cap. The end cap of the cylinder body forms a sealed cavity. The piston is disposed within the cylinder body. The piston rod extends into the cylinder body from the outside of the end cap and connects to the piston. A sealing ring is provided on the outer periphery of the piston, dividing the cylinder body into an isolated elastic cavity and an inflation cavity. An elastic element is provided in the elastic cavity. An inflation port is provided on the end cap of the cylinder body away from the piston rod, and the inflation port communicates with the inflation cavity. The end of the piston rod has a connecting portion, which can move relative to the outside when connected. The connecting portion includes a flat portion at the end of the piston rod, and a spherical hole orthogonal to the piston rod axis is provided on the flat portion. A spherical connector is provided in the spherical hole, and the spherical connector has a connecting hole.

[0006] A further preferred technical solution allows for relative movement of the end cap at the end furthest from the piston rod when it is connected to the outside.

[0007] A further preferred technical solution is that the end cap has an integral first hinge plate, and the first hinge plate is provided with hinge holes.

[0008] In a further preferred embodiment, the number of the first hinge plates is a pair, the pair of first hinge plates are symmetrically arranged, the first hinge plate is triangular in shape, wherein one side of the first hinge plate is attached to the corresponding end cap, and the apex of the side extends away from the end cap and the apex is made into an arc shape.

[0009] A further preferred technical solution includes a hinge seat, the hinge seat comprising a plate-shaped seat body, the seat body having an integral second hinge plate, the second hinge plate being triangular in shape, wherein one side of the second hinge plate is in contact with the seat body, the apex of the side extending away from the seat body and the apex being rounded, and the hinge seat can be connected to the end cap via a hinge shaft.

[0010] In a further preferred embodiment, a pressure relief port is provided in the middle of the cylinder body, and the piston selectively blocks the pressure relief port so that the pressure relief port selectively communicates with the inflation chamber.

[0011] In a further preferred embodiment, the elastic element is a return spring, which is sleeved on one end of the piston rod that extends into the cylinder and abuts against the inner wall of the cylinder and the piston, respectively.

[0012] In a further preferred embodiment, a first receiving annular groove is provided on the side of the piston near the return spring, and one end of the return spring extends into the first receiving annular groove and abuts against the piston; a second receiving annular groove is provided on the inner wall of the end cap, and the end of the return spring away from the piston extends into the second receiving annular groove and abuts against the inner wall of the end cap.

[0013] A further preferred technical solution also includes an inflation tube and a solenoid valve, wherein the inflation tube is connected to the inflation port and the solenoid valve is disposed on the inflation tube.

[0014] In a further preferred embodiment, an adjusting shim is provided inside the elastic cavity, the elastic element abuts against the adjusting shim, the outer periphery of the adjusting shim slides against the inner wall of the cylinder, an adjusting screw is provided on the side of the adjusting shim away from the elastic element, the adjusting screw is hinged to the adjusting shim, the adjusting screw is threaded into the inner wall of the cylinder, a pair of symmetrical and radially arranged adjusting rods are provided on the side of the adjusting screw away from the adjusting shim, the adjusting rods penetrate the cylinder body radially to the outer side of the cylinder, and a spiral through hole is provided on the cylinder corresponding to the adjusting rods.

[0015] The advantages and beneficial effects of this invention are as follows: the cylinder barrel, end cap, adjustable annular connecting part, and reinforcing screw of the single-acting cylinder for the magnetic track brake are made of 45Cr material and undergo quenching and tempering treatment, which allows it to withstand greater air pressure and have greater thrust under the same cylinder diameter. Simultaneously, a structural design at the piston rod end incorporates an adjustable annular ring, enabling it to change direction. During vehicle operation, the adjusting pin at the mounting base can be axially adjusted, and the adjustable annular ring at the piston rod end can automatically adjust its direction according to forces in different directions, making it more suitable for the vehicle operating environment, avoiding stress concentration, and extending service life.

[0016] The single-acting cylinder of the magnetic track brake is designed according to the characteristics of subway vehicles. It is installed on the lower part of the two side frames of the subway vehicle bogie, between the two wheels on the same side, and has the advantages of high strength, large thrust and variable direction. Attached Figure Description

[0017] Figure 1 This is an isometric view of the present invention; Figure 2 This is the front view of the present invention; Figure 3 This is a side view of the present invention; Figure 4 This is a diagram of the inflation system of the present invention; Figure 5 This is a cross-sectional view of the cylinder with adjustable stroke according to the present invention; Figure 6 This is a diagram of the adjustable-stroke cylinder of the present invention; In the diagram: 100, cylinder mounting base; 101, second hinge plate; 110, end cap; 111, first hinge plate; 120, cylinder body; 130, piston rod; 131, connecting part; 132, ball joint; 140, air inlet; 150, elastic element; 160, adjusting shim; 170, adjusting screw; 180, adjusting rod; 190, through hole. Detailed Implementation

[0018] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solutions of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0019] like Figure 1-6As shown, a single-acting cylinder for a magnetic track brake includes a cylinder body 120, a piston, a piston rod 130, and an end cap 110. The end cap 110 at the end of the cylinder body 120 forms a sealed cavity. The piston is disposed inside the cylinder body 120. The piston rod 130 extends into the cylinder body 120 from the outside of the end cap and connects to the piston. A sealing ring is provided on the outer periphery of the piston, dividing the cylinder body 120 into an isolated elastic cavity and an inflation cavity. The elastic cavity is provided with an elastic element 150 that abuts against the inner wall of the end cap 110 and the piston, respectively. An inflation port 140 is provided on the end cap at the end of the cylinder body 120 away from the piston rod. The inflation port 140 communicates with the inflation cavity. In some embodiments, a pressure relief port may also be provided in the middle of the cylinder body 120. The piston selectively blocks the pressure relief port so that the pressure relief port selectively communicates with the inflation cavity.

[0020] In this embodiment, air is first introduced into the inflation chamber through the inflation port. Under the action of air pressure, the piston moves towards the direction of compressing the elastic chamber and compresses the elastic element 150 in the elastic chamber. When the stroke is completed, the inflation port is switched to the pressure relief port by the control valve to relieve the pressure in the inflation chamber. The elastic element 150 in the elastic chamber is released from the compressed state. Under the elastic force of the elastic element 150, the piston moves towards the direction of compressing the inflation chamber and returns to the initial state. Then the inflation action is performed again, realizing the automatic reciprocating action of the piston.

[0021] It should be noted that in this embodiment, the cylinder body 120 has a cylindrical structure. The two ends of the cylinder body are provided with end caps 110. The two end caps 110 are locked to the ends of the cylinder body 120 by four parallel screws and nuts. Each screw passes through the end caps 110 at both ends. The air inlet 140 is provided on the outer circumferential surface of the end cap near the air chamber. The air inlet 140 is connected to an air inflation device, such as an air pump with an air inflation hose, etc., which is not specifically limited here.

[0022] In this embodiment, the elastic element 150 is a return spring, which is sleeved on the end of the piston rod 130 that extends into the cylinder 120 and abuts against the inner wall of the end cap 110 and the piston, respectively. When the piston is in the initial position, the return spring is also in the initial position and is in an extended state. When the piston moves in the extended direction, the return spring is compressed. Of course, the elastic element 150 can also be an elastic rubber column or a spring sheet, etc., and is not specifically limited here.

[0023] See Figure 3In this embodiment, a first receiving ring groove is provided on the side of the piston near the return spring, and one end of the return spring extends into the first receiving ring groove and abuts against the piston. Specifically, a first connecting block is provided in the first receiving ring groove, and one end of the return spring is fixedly disposed on the first connecting block in the first receiving ring groove, preferably welded to the first connecting block, thereby making the return spring and the piston fixedly connected.

[0024] In this embodiment, a second receiving annular groove is formed on the inner wall of the end cap. The end of the return spring away from the piston extends into the second receiving annular groove and abuts against the inner wall of the end cap 110. Specifically, a second connecting block is provided in the second receiving annular groove. The end of the return spring away from the piston is fixedly disposed on the second connecting block in the second receiving annular groove. Preferably, it is welded to the second connecting block, thereby making the return spring fixedly connected to the inner wall of the end cap 110.

[0025] The working principle of a single-acting cylinder for a magnetic track brake provided by this invention is as follows: When the piston is in the initial position, the piston is in the extreme rightward position, and the air inlet 140 of the air chamber begins to intake air. Under the action of air pressure, the piston moves towards the elastic chamber. As the piston moves towards the elastic chamber and compresses the elastic element 150, the elastic element 150 provides a reverse and increasing elastic force. When the stroke is in place, the air inlet is converted into a pressure relief port through the control valve, and the air chamber is depressurized instantaneously. Under the action of the elastic force of the elastic element 150 in the elastic chamber, the piston moves quickly towards the air chamber side to reset. At this time, the air chamber continues to be filled with air, and the piston begins to move towards the elastic chamber and enters the next reciprocating cycle.

[0026] The piston includes a load-bearing part and a sealing ring. The sealing ring is fixedly disposed on the outer peripheral surface of the load-bearing part and seals against the inner peripheral wall of the cylinder 120. The piston rod 130 is fixedly connected to one end of the load-bearing part, and the other end of the load-bearing part reciprocates in the inflation chamber and selectively abuts against the inner wall of the end cap.

[0027] In this embodiment, the end of the load-bearing part away from the piston rod 130 protrudes onto the end face of the sealing ring away from the piston rod 130, thus forming a stepped structure between the load-bearing part and the sealing ring. During the reciprocating motion, the end of the load-bearing part moves to the right and can abut against the inner wall of the end cap. At this time, due to the stepped structure, there is a clearance space between the end of the sealing ring and the inner wall of the bottom end cap of the cylinder 120, which avoids the inflation chamber from being completely compressed and facilitates the next inflation.

[0028] In one embodiment, an adjusting shim 160 is provided in the elastic chamber, and the elastic element 150 abuts against the adjusting shim 160. The outer periphery of the adjusting shim 160 slides in cooperation with the inner wall of the cylinder 120. The core of the adjusting shim 160 is provided with a core hole for the piston rod 130 to pass through. An adjusting screw 170 is provided on the side of the adjusting shim 160 away from the elastic element 150. The adjusting screw 170 is hinged to the adjusting shim 160. The adjusting screw 170 is threaded in cooperation with the inner wall of the cylinder 120. The core of the adjusting screw 170 is connected to the core hole for the piston rod 130 to pass through. A pair of symmetrical and radially arranged adjusting rods 180 are provided on the side of the adjusting screw 170 away from the adjusting shim 160. The adjusting rods 180 radially penetrate the body of the cylinder 120 to the outside of the cylinder 120. A spiral through hole 190 is provided on the cylinder 120 corresponding to the adjusting rods 180.

[0029] The adjusting rod 180 can rotate the adjusting screw 170 along the spiral through hole 190 to drive the adjusting shim 160 to reciprocate, adjusting the distance between the adjusting shim 160 and the piston. This adjusts the extension length of the piston rod 130 to form suspension cylinders with different strokes. Simultaneously, the compression of the elastic element 150 can be adjusted to regulate its elastic recovery force. By adjusting the stroke of the suspension cylinder, the magnetic track braking device can adapt to different rail vehicles. Generally, the distance between the magnetic track braking device and the top surface of the rail on which the rail vehicle travels needs to be greater than 60mm, and the cylinder stroke redundancy design is greater than 85mm. With the suspension cylinder having the adjusting shim 160, only the distance between the adjusting shim 160 and the piston needs to be adjusted to the actual required distance, making it very convenient to use.

[0030] In one embodiment, the piston rod 130 has a connecting portion 131 at its end. When the connecting portion 131 is connected to the outside, it can move relative to the outside. The relative movement includes free rotation or displacement along the X, Y, and Z directions, so that when the piston rod is connected to the outside, the external connector moves relative to the cylinder. If the piston rod 130 is rigidly connected to the external connector, the piston rod 130 will be deformed by force, causing the piston rod 130 to get stuck on the end cover 110, resulting in the failure of the entire cylinder. However, when connected to the external connector through the connecting portion 131, the piston rod 130 can move relative to the external connector, avoiding deformation of the piston rod 130. Specifically, the connecting part 131 includes a flat part at the end of the piston rod. The flat part can be a square, rectangle, or other polygonal structure. A spherical hole orthogonal to the piston rod axis is provided on the flat part. A spherical connector 132 is provided in the spherical hole. The spherical connector 132 has a connecting hole. The external connector is connected to the connecting hole of the spherical connector 132 through a pin. The spherical connector 132 is hinged to the flat part of the piston rod 130. In this way, the spherical connector can rotate relative to the flat part. Moreover, when the pin is connected to the connecting hole, a certain gap can be reserved in the axial direction to form a certain clearance space.

[0031] Furthermore, the spherical connector 13 and the flat portion can be connected by filling with rubber. The rubber is elastic, and the elasticity of the rubber can be used to allow the connector to move relative to the outside when connected.

[0032] In one embodiment, the end cap 110, located away from the piston rod 130, can also move relative to the outside when connected to the outside. The relative movement includes free rotation or displacement along the X, Y, and Z directions, so that when the end cap 110 is connected to the outside, the external connector moves relative to the cylinder. If the end cap is rigidly connected to the external connector, the cylinder body will be deformed by force, and the entire cylinder will fail to work. However, when the end cap 110 is connected to the external connector, the end cap and the external connector can move relative to each other, thus preventing the cylinder body from deforming. Specifically, the end cap 110 has an integral first hinge plate 111, which has a hinge hole. In this embodiment, there is a pair of first hinge plates 111, which are symmetrically arranged. The first hinge plate 111 is triangular in shape, with one side of the first hinge plate 111 fitting against the end cap 110. The apex of this side extends away from the end cap 110 and is rounded. It also includes a hinge seat 100. The seat 100 includes a plate-shaped seat body with an integral second hinge plate 101. The second hinge plate 101 is generally triangular, with one side of the second hinge plate 101 fitting against the seat body. The apex of this side extends away from the seat body and is made into an arc shape. In this way, the second hinge seat 101 can be connected to the end cover 110 through a hinge shaft and rotate relative to it. Moreover, when the pin is connected to the hinge hole, a certain gap can be reserved in the axial direction to form a certain clearance space.

[0033] It should be noted that the external connecting component can be a magnetic rail brake frame or a bogie.

[0034] In summary, this embodiment provides a single-acting cylinder for a magnetic track brake. A sealed elastic cavity is provided within the cylinder body 120. Elastic elements 150 are installed within the elastic cavity, respectively abutting against the inner wall of the end cap and the piston. A pressure relief port is also provided on the cylinder body 120, or the air inlet can be converted to a pressure relief port via a control valve. In actual use, air is first introduced into the air chamber through the air inlet 140. Under the action of air pressure, the piston moves towards compressing the elastic cavity and compresses the gas within it. Once the stroke is complete, the air in the air chamber is quickly released, the elastic element 150 in the elastic cavity is released from its compressed state, and the piston moves towards compressing the air chamber under the elastic force of the elastic element 150 and returns to its initial state. Then, the air inlet action is performed again, realizing the automatic reciprocating motion of the piston. Compared with the prior art, this invention provides a cylinder capable of automatic reciprocating function, with a simple structure, convenient processing, a simple control circuit, and convenient component replacement.

[0035] Another embodiment of the present invention provides a single-acting cylinder system 200 for a magnetic track brake, including an air inlet pipe 210, a solenoid valve 230, and a single-acting cylinder for a magnetic track brake. The basic structure, principle, and technical effects of the single-acting cylinder for a magnetic track brake are the same as those in the above embodiment. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding contents in the above embodiments.

[0036] A single-acting cylinder for a magnetic track brake includes a cylinder body 120, a piston, a piston rod 130, and an end cap 110. The cylinder body 120 has an end cap at one end, forming a sealed cavity. The piston is disposed within the cylinder body 120. The piston rod 130 extends into the cylinder body 120 from the outside of the end cap and connects to the piston. A sealing ring is provided on the outer periphery of the piston, dividing the cylinder body 120 into an isolated elastic cavity and an inflation cavity. The elastic cavity is provided with elastic elements 150 that abut against the inner wall of the cylinder body 120 and the piston, respectively. An inflation port 140 is provided on the end cap at the end of the cylinder body 120 away from the piston rod, communicating with the inflation cavity. A pressure relief port is provided in the middle of the cylinder body 120, and the piston selectively seals the pressure relief port, allowing selective communication between the pressure relief port and the inflation cavity. An inflation pipe 210 is connected to the inflation port 170, and a solenoid valve 230 is disposed on the inflation pipe 210.

[0037] In some embodiments, the cylinder body 120 does not have a pressure relief port 190 in the middle, and the cylinder body 120 is a sealed structure. The pressure relief process of its inflation chamber is also completed by the inflation pipe 210. Specifically, the inflation chamber of the cylinder is depressurized by means of a mechanically controlled valve. The single-acting cylinder for the magnetic track brake provided in this embodiment can be used directly.

[0038] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A single-acting cylinder for a magnetic track brake, comprising a cylinder body, a piston, a piston rod, and an end cap, wherein the end cap is provided at one end of the cylinder body to form a sealed cavity, the piston is disposed within the cylinder body, the piston rod extends into the cylinder body from the outside of the end cap and connects to the piston, a sealing ring is provided on the outer periphery of the piston to divide the cylinder body into an isolated elastic cavity and an inflation cavity, the elastic cavity is provided with an elastic element, and an inflation port is provided on the end cap at the end of the cylinder body away from the piston rod, the inflation port communicating with the inflation cavity, characterized in that... The piston rod has a connecting part at its end, which can move relative to the outside when connected. The connecting part includes a flat part at the end of the piston rod, and a spherical hole orthogonal to the piston rod axis is opened on the flat part. A spherical connector is provided in the spherical hole, and the spherical connector has a connecting hole.

2. A single-acting cylinder for a magnetic track brake according to claim 1, characterized in that, The end cap at the end furthest from the piston rod can also move relative to the outside when connected to the outside.

3. A single-acting cylinder for a magnetic track brake according to claim 2, characterized in that, The end cap has an integral first hinge plate with hinge holes.

4. A single-acting cylinder for a magnetic track brake according to claim 2, characterized in that, The number of the first hinge plates is a pair, and the pair of first hinge plates are symmetrically arranged. The first hinge plate is triangular in shape, wherein one side of the first hinge plate is attached to the corresponding end cap, and the apex of the side extends away from the end cap and the apex is made into an arc shape.

5. A single-acting cylinder for a magnetic track brake according to claim 4, characterized in that, It also includes a hinge seat, which includes a plate-shaped seat body with an integral second hinge plate on the seat body. The second hinge plate is generally triangular, wherein one side of the second hinge plate is in contact with the seat body, and the corresponding apex of the side extends away from the seat body and the apex is made into an arc shape. The hinge seat can be connected to the end cap via a hinge shaft.

6. A single-acting cylinder for a magnetic track brake according to claim 1, characterized in that, The cylinder body has a pressure relief port in the middle, and the piston selectively blocks the pressure relief port so that the pressure relief port selectively communicates with the inflation chamber.

7. A single-acting cylinder for a magnetic track brake according to claim 1, characterized in that, The elastic element is a return spring, which is sleeved on one end of the piston rod that extends into the cylinder and abuts against the inner wall of the end cap and the piston, respectively.

8. A single-acting cylinder for a magnetic track brake according to claim 8, characterized in that, A first receiving ring groove is provided on the side of the piston near the return spring, and one end of the return spring extends into the first receiving ring groove and abuts against the piston; a second receiving ring groove is provided on the inner wall of the end cap, and the end of the return spring away from the piston extends into the second receiving ring groove and abuts against the inner wall of the end cap.

9. A single-acting cylinder for a magnetic track brake according to claim 1, characterized in that, It also includes an inflation tube and a solenoid valve, wherein the inflation tube is connected to the inflation port and the solenoid valve is disposed on the inflation tube.

10. A single-acting cylinder for a magnetic track brake according to claim 1, characterized in that an adjusting shim is provided in the elastic cavity, the elastic element abuts against the adjusting shim, the outer periphery of the adjusting shim slides against the inner wall of the cylinder body, an adjusting screw is provided on the side of the adjusting shim away from the elastic element, the adjusting screw is hinged to the adjusting shim, the adjusting screw is threaded into the inner wall of the cylinder body, a pair of symmetrical and radially arranged adjusting rods are provided on the side of the adjusting screw away from the adjusting shim, the adjusting rods radially penetrate the cylinder body to the outer side of the cylinder body, and a spiral through hole is provided on the cylinder body corresponding to the adjusting rods.

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