A power saving system for manually remotely relieving parking brake

Abstract

The application provides a parking brake manual remote relief labor-saving system, which comprises a compressed air supply pipeline, an execution module, a protection module and a relief device; the relief device comprises a protection cylinder and an execution cylinder; a piston structure is arranged in each of the protection cylinder and the execution cylinder; the protection cylinder is provided with a protection cylinder spring; the piston rod of the protection cylinder is connected with the piston of the execution cylinder through a connecting body; the execution cylinder is provided with an execution cylinder spring; the compressed air supply pipeline is used for supplying compressed air; the execution module is used for controlling the filling or discharging of compressed air into the compressed air cavity of the execution cylinder; the protection module is used for controlling the filling or discharging of compressed air into the compressed air cavity of the protection cylinder; when the parking brake device needs to be relieved, the compressed air cavity of the execution cylinder is controlled to discharge compressed air by the execution module, and the piston rod of the execution cylinder pulls the steel wire rope b to relieve the parking brake device. The application can relieve the parking brake on the vehicle mechanically, can improve the safety of the staff, shorten the fault handling time and reduce the influence of the fault.

Description

Technical Field

[0001] This invention relates to the field of rail vehicle braking technology, and more particularly to a manual remote release system for parking brakes that saves effort. Background Technology

[0002] The basic braking system of rail vehicles typically includes a parking brake, with hand-operated release rings located near the wheels of the bogies on both sides of the vehicle. These rings are connected to the parking brake via steel wire ropes to release the spring-loaded braking force generated by the parking brake, ensuring that the parking brake can be released when there is no air. This operation requires a relatively large pulling force and can only be performed from under the vehicle; mechanical release from the vehicle itself is not possible. Figure 1 As shown, when the air supply line for the parking brake leaks during vehicle operation, and cannot overcome the spring force in the parking brake cylinder, resulting in the accidental application of the parking brake, and the parking brake cannot be relieved by the vehicle's relevant settings, for the basic braking device A with parking brake (B represents the basic braking device without parking brake), personnel need to operate the hand release ring C, short steel wire rope D, and long steel wire rope E under the vehicle to relieve the parking brake. When manually pulling the hand release ring C, short steel wire rope D, and long steel wire rope E, the pulling force is large, which poses a great safety hazard, takes a long time to handle the fault, and has a significant impact. Summary of the Invention

[0003] To address the technical problems of existing manual mechanical release of parking brakes, a labor-saving manual parking brake remote release system is provided, which is simple in structure, easy to assemble, and can be mechanically released on the vehicle. This system can improve the safety of staff, shorten the fault handling time, and reduce the impact of faults.

[0004] The technical means employed in this invention are as follows:

[0005] A parking brake manual remote release system for labor-saving operation includes an air supply duct, an execution module, a protection module, and a release device.

[0006] The relief device includes a protective cylinder and an actuator cylinder fixedly connected to each other via a connector. Both the protective cylinder and the actuator cylinder have piston structures installed inside, which divide their interiors into a compressed air chamber and a spring mounting chamber. The compressed air chambers of the protective cylinder and the actuator cylinder are adjacent. The piston structure includes a piston and a piston rod. A protective cylinder spring is installed in the spring mounting chamber of the protective cylinder. The piston rod of the protective cylinder passes through the connector and extends into the compressed air chamber of the actuator cylinder, where it is in contact with the piston of the actuator cylinder. An actuator cylinder spring is installed in the spring mounting chamber of the actuator cylinder. The piston rod of the actuator cylinder passes through the actuator cylinder spring and extends from the bottom of the actuator cylinder, connecting to the parking brake device on the vehicle's basic braking system via a steel wire rope.

[0007] The air supply pipeline is used to supply compressed air; the air supply pipeline is connected to the compressed air chambers of the actuator cylinder and the protector cylinder respectively through the actuator module and the protector module; the actuator module is used to control the filling or discharging of compressed air into the compressed air chamber of the actuator cylinder; the protector module is used to control the filling or discharging of compressed air into the compressed air chamber of the protector cylinder;

[0008] When the relief and labor-saving system is in the normal state, compressed air is injected into the compressed air chambers of the execution cylinder and the protection cylinder through the execution module and the protection module, respectively.

[0009] When it is necessary to release the parking brake, the compressed air chamber of the actuator cylinder is controlled by the actuator module to discharge compressed air, and the piston rod of the actuator cylinder pulls the steel wire rope b to release the parking brake.

[0010] When the relief and labor-saving system is in normal operation, but the gas pressure in the compressed air chamber of the actuator cylinder decreases, the protection module controls the compressed air chamber of the protection cylinder to discharge compressed air, thereby preventing the piston of the actuator cylinder from malfunctioning.

[0011] Furthermore, when there is no compressed air in the compressed air chambers of the protective cylinder and the actuator cylinder, the initial spring force of the protective cylinder spring is at least three times the initial spring force of the actuator cylinder spring.

[0012] Furthermore, the execution module includes a one-way valve I, a solenoid valve, and a plug valve; the solenoid valve includes an intake passage I and an exhaust passage I;

[0013] The first port of the one-way valve I is connected to the air supply pipeline, and the second port is connected to the air inlet passage I of the solenoid valve.

[0014] The first connection port of the plug is connected to the intake passage I and exhaust passage I of the solenoid valve, and the second port is connected to the compressed air chamber of the actuator cylinder. The solenoid valve is normally de-energized. When the parking brake needs to be released, the solenoid valve is energized. When the solenoid valve is de-energized, the intake passage I is open and the exhaust passage I is closed, and compressed air is introduced into the compressed air chamber of the actuator cylinder through the intake passage I. When the solenoid valve is energized, the intake passage I is closed and the exhaust passage I is open, and the compressed air in the compressed air chamber of the actuator cylinder is discharged through the exhaust passage I.

[0015] Furthermore, the plug is provided with an exhaust port and a handle for controlling the exhaust port switch.

[0016] Furthermore, the protection module includes a one-way valve II, a throttling plug, and a pneumatic valve; the pneumatic valve includes a pneumatic regulating port, an intake passage II, and an exhaust passage II;

[0017] The second port of the one-way valve I is also connected to the first port of the one-way valve II and the pneumatic regulating port of the pneumatic valve; the pressure at the pneumatic regulating port is the same as the pressure at the inlet of the solenoid valve's inlet passage I; the second port of the one-way valve II is connected to the first port of the throttling and constricting valve; the second port of the throttling and constricting valve is connected to the inlet passage II of the pneumatic valve.

[0018] The throttling and blocking method is used to slow down the rate at which compressed air is introduced into the compressed air chamber of the protective cylinder, so that the rate at which compressed air is introduced into the compressed air chamber of the protective cylinder is less than the rate at which compressed air is introduced into the compressed air chamber of the actuator cylinder.

[0019] The compressed air chamber of the protective cylinder is connected to the air intake passage II and the exhaust passage II of the pneumatic valve, respectively.

[0020] The movement of the valve stem inside the pneumatic valve is related to the pressure at the pneumatic regulating port. The pressure at the pneumatic regulating port corresponding to the movement of the valve stem is set as a set value. The pneumatic valve is also equipped with a spring for resetting the valve stem after it has moved.

[0021] When the relief and labor-saving system is in the normal state or the parking brake device is released, the pressure at the pneumatic regulating port is greater than or equal to the set value, the valve stem is activated, the air intake passage II is opened, the exhaust passage II is closed, and compressed air is injected into the compressed air chamber of the protective cylinder through the air intake passage II.

[0022] When the relief and labor-saving system is in its normal state, but the gas pressure in the compressed air chamber of the actuator cylinder decreases, the pressure at the inlet of the intake passage I and the pressure at the pneumatic regulating port also decrease. When the pressure at the pneumatic regulating port decreases to less than a set value, the valve stem resets under the action of the spring, the intake passage II is closed, and the exhaust passage II is opened, so that the compressed air in the compressed air chamber of the protection cylinder is discharged through the exhaust passage II to prevent the piston of the actuator cylinder from malfunctioning. When the pressure at the pneumatic regulating port recovers from less than the set value to greater than or equal to the set value, the valve stem actuates, the intake passage II is opened, and the exhaust passage II is closed, so that compressed air is refilled into the compressed air chamber of the protection cylinder through the intake passage II.

[0023] Furthermore, the protective cylinder also includes a protective cylinder body, a protective cylinder piston, and a protective cylinder piston rod; the actuator also includes an actuator cylinder body, an actuator piston rod, and an actuator piston.

[0024] The interior of the protective cylinder body and the actuator cylinder body is an axial two-section stepped hole structure formed by a stepped platform. The stepped hole structure includes a small diameter section and a large diameter section, and the small diameter section is close to the bottom of the protective cylinder body and the actuator cylinder body.

[0025] The front end sidewalls of the large-diameter sections of the protective cylinder body and the actuator cylinder body are respectively provided with a protective cylinder air inlet and an actuator air inlet; the actuator module and the protective module are respectively connected to the actuator air inlet and the protective cylinder air inlet;

[0026] The protective cylinder piston and the actuator cylinder piston are respectively concentrically fitted and installed within the large-diameter section of the protective cylinder body and the actuator cylinder body;

[0027] The protective cylinder spring is located between the protective cylinder piston and the bottom of the protective cylinder body; the protective cylinder spring is used to provide power to the protective cylinder piston and the protective cylinder piston rod;

[0028] The actuator spring is located between the actuator piston and the bottom of the actuator cylinder body; the actuator spring is used to provide power to the actuator piston and the actuator piston rod;

[0029] The stepped platforms inside the protective cylinder body and the actuator cylinder body are used to limit the axial movement of the piston in the protective cylinder and the piston in the actuator cylinder, respectively.

[0030] One end of the piston rod of the protective cylinder is fixedly connected to the piston of the protective cylinder, and the other end passes through the central hole of the connecting body and extends into the cylinder body of the actuator, with its end face in contact with the piston of the actuator.

[0031] One end of the piston rod of the actuator cylinder is fixedly connected to the piston of the actuator cylinder, and the other end passes through the actuator cylinder spring and extends out from the bottom of the actuator cylinder to be connected to the steel wire rope.

[0032] Furthermore, a boss is provided axially at the center of each side of the connecting body; the air inlet of the protective cylinder and the air inlet of the actuator cylinder are respectively located on the front end sidewall of the large-diameter section corresponding to the boss in the cylinder body of the protective cylinder and the cylinder body of the actuator cylinder; the two bosses are used to restrict the axial movement position of the piston of the protective cylinder and the piston of the actuator cylinder respectively.

[0033] Furthermore, the protective cylinder also includes a protective cylinder adjusting bolt and a protective cylinder adjusting block; the protective cylinder adjusting block is concentrically installed within the small-diameter section of the protective cylinder body; the protective cylinder spring is installed between the protective cylinder adjusting block and the protective cylinder piston; the protective cylinder adjusting bolt is installed in a threaded through hole at the center of the bottom of the protective cylinder body and fits against the protective cylinder adjusting block; the protective cylinder adjusting bolt and the protective cylinder adjusting block cooperate to adjust the spring force of the protective cylinder spring.

[0034] Furthermore, the actuator also includes an actuator adjusting bolt and an actuator adjusting block; the actuator adjusting block is concentrically installed within the small-diameter section of the actuator body; the actuator spring is installed between the actuator adjusting block and the actuator piston; the actuator adjusting bolt is installed in a threaded through hole at the center of the bottom of the actuator body and fits against the actuator adjusting block; the actuator adjusting bolt and the actuator adjusting block cooperate to adjust the spring force of the actuator spring; both the actuator adjusting bolt and the actuator adjusting block have through holes at their centers for the actuator piston rod to pass through.

[0035] Furthermore, the small-diameter section of the sidewall of the protective cylinder and the actuator cylinder is provided with a breather hole I and a breather hole II, respectively, to maintain the internal and external pressure balance of the chambers where the breather hole I and the breather hole II are located.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] The parking brake manual remote release labor-saving system provided by the present invention, by setting up an execution module, allows the operator to release the parking brake device simply by controlling the solenoid valve or turning the stopcock handle, without the need for manual pulling or getting out of the vehicle, reducing the operator's labor intensity and improving the safety of the operators and the efficiency of fault handling.

[0038] Based on the above reasons, this invention can be widely applied in the field of rail vehicle braking. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of an existing manual mechanical parking brake release device.

[0041] Figure 2This is a schematic diagram showing the connection between the parking brake manual remote release labor-saving system described in this invention and the vehicle's basic braking device.

[0042] Figure 3 This is a schematic diagram of the manual remote release and labor-saving system for parking brakes as described in this invention.

[0043] Figure 4 This is a schematic diagram of the relief device described in this invention.

[0044] Figure 5 This is a cross-sectional view of the mitigation device described in this invention.

[0045] Figure 6 This is a flowchart illustrating the manual remote release and labor-saving system for parking brakes as described in this invention.

[0046] Figure 7 This is a schematic diagram illustrating the working principle of the manual remote release and labor-saving parking brake system described in this invention under normal conditions.

[0047] Figure 8 This is a schematic diagram illustrating the working principle of the parking brake manual remote release labor-saving system of the present invention in the parking brake release state.

[0048] In the diagram: 1. Air supply duct; 2. Actuation module; 21. Check valve I; 22. Solenoid valve; 23. Plug; 3. Protection module; 31. Check valve II; 32. Throttling and blocking device; 33. Pneumatic valve; 4. Relief device; 41. Protective cylinder; 411. Protective cylinder body; 412. Protective cylinder adjusting bolt; 413. Protective cylinder adjusting block; 414. Protective cylinder spring; 415. Protective cylinder piston; 416. Protective cylinder piston rod; 417. Protective cylinder piston sealing ring ; 418. Air inlet of protective cylinder; 419. Breathing hole I; 42. Actuating cylinder; 421. Actuating cylinder body; 422. Actuating cylinder adjusting bolt; 423. Actuating cylinder piston rod; 424. Actuating cylinder adjusting block; 425. Actuating cylinder spring; 426. Actuating cylinder piston; 427. Actuating cylinder piston sealing ring; 428. Actuating cylinder air inlet; 429. Breathing hole II; 43. Connector; 44. Sealing gasket; 45. Bolt; 46. Nut; 47. Sealing ring. Detailed Implementation

[0049] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0053] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0054] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0056] Example 1

[0057] like Figure 2-8 As shown, the present invention provides a parking brake manual remote release labor-saving system, including an air supply pipeline 1, an execution module 2, a protection module 3, and a release device 4;

[0058] The relief device 4 includes a protective cylinder 41 and an actuator 42 fixedly connected to each other via a connector 43. Both the protective cylinder 41 and the actuator 42 are equipped with piston structures, which divide their interiors into a compressed air chamber and a spring mounting chamber. The compressed air chambers of the protective cylinder 41 and the actuator 42 are adjacent. The piston structure includes a piston and a piston rod. A protective cylinder spring 414 is installed in the spring mounting chamber of the protective cylinder 41. The piston rod of the protective cylinder 41 passes through the connector 43 and extends into the compressed air chamber of the actuator 42, where it is in contact with the piston of the actuator 42. An actuator spring 425 is installed in the spring mounting chamber of the actuator 42. The piston rod of the actuator 42 passes through the actuator spring 425 and extends from the bottom of the actuator 42, connecting to the parking brake device on the vehicle's basic braking device e via a steel wire rope b.

[0059] The air supply pipeline 1 is used to supply compressed air; the air supply pipeline 1 is connected to the compressed air chambers of the actuator cylinder 42 and the protection cylinder 41 through the actuator module 2 and the protection module 3 respectively; the actuator module 2 is used to control the filling or discharging of compressed air into the compressed air chamber of the actuator cylinder 42; the protection module 3 is used to control the filling or discharging of compressed air into the compressed air chamber of the protection cylinder 41.

[0060] When the relief and labor-saving system is in the normal state, compressed air is injected into the compressed air chambers of the execution cylinder 42 and the protection cylinder 41 through the execution module 2 and the protection module 3, respectively;

[0061] When it is necessary to release the parking brake, the compressed air chamber of the actuator 42 is controlled by the actuator module 2 to discharge compressed air, and the piston rod of the actuator 42 pulls the steel wire rope b to release the parking brake.

[0062] When the relief and labor-saving system is in normal state, but the gas pressure in the compressed air chamber of the actuator 42 decreases, the protection module 3 controls the compressed air chamber of the protection cylinder 41 to discharge compressed air, thereby preventing the piston of the actuator 42 from malfunctioning.

[0063] Furthermore, filling the compressed air chamber of the actuator 42 with compressed air can compress the actuator spring 425 to store spring force; controlling the compressed air chamber of the actuator 42 to discharge compressed air can release the actuator spring 425 to release spring force, thereby enabling the piston rod of the actuator 42 to pull the steel wire rope b to relieve the parking brake device.

[0064] Furthermore, in this invention, when the relief and labor-saving system is in a normal state, the gas pressure in the compressed air chamber of the actuator 42 may decrease due to reasons such as the vehicle being parked for a long time or the actuator 2 leaking air. This may cause the piston of the actuator 42 to malfunction because it cannot overcome the spring force of the actuator spring 425.

[0065] Furthermore, when there is no compressed air in the compressed air chambers of the protective cylinder 41 and the actuator 42, the initial spring force of the protective cylinder spring 414 is at least three times the initial spring force of the actuator spring 425. When there is no compressed air in the compressed air chambers of the protective cylinder 41 and the actuator 42, both the protective cylinder spring 414 and the actuator spring 425 are released. Since the spring force of the protective cylinder spring 414 is greater, and the piston rod in the protective cylinder 41 extends into the actuator 42 and is in contact with the piston of the actuator 42, it can prevent the piston and piston rod of the actuator 42 from moving. Therefore, the piston rod of the actuator 42 will not pull the steel wire rope b, thus avoiding accidental release of the parking brake device.

[0066] Furthermore, hand release rings d are provided near the wheels of the bogies on both sides of the vehicle. When the vehicle needs to be moved after maintenance work in the depot or after being parked for a long time, the parking brake device can be easily released by manually pulling the hand release rings d from under the vehicle.

[0067] Furthermore, the execution module 2 includes a one-way valve I 21, a solenoid valve 22, and a plug valve 23; the solenoid valve 22 includes an intake passage I (P port in, A port out) and an exhaust passage I (B port in, R port out);

[0068] The first port of the one-way valve I21 is connected to the air supply pipeline 1 through a pipeline, and the second port is connected to the air inlet passage I of the solenoid valve 22 through a pipeline.

[0069] The first connection port of the plug 23 is connected to the intake passage I and exhaust passage I of the solenoid valve 22 via pipelines, and the second port is connected to the compressed air chamber of the actuator 42 via a pipeline. The solenoid valve 22 is normally de-energized (i.e., when the power-saving system is in normal state, the solenoid valve 22 is de-energized). When the parking brake needs to be released, the solenoid valve 22 is energized. When the solenoid valve 22 is de-energized, the intake passage I is open and the exhaust passage I is closed, and compressed air is introduced into the compressed air chamber of the actuator 42 through the intake passage I. When the solenoid valve 22 is energized, the intake passage I is closed and the exhaust passage I is open, and the compressed air in the compressed air chamber of the actuator 42 is discharged through the exhaust passage I.

[0070] Furthermore, compressed air can flow from the first port of the one-way valve I 21 and the one-way valve II 31 to the second port and cannot flow in the opposite direction.

[0071] Furthermore, when the solenoid valve 22 is de-energized, compressed air from the air supply line 1 is filled into the compressed air chamber of the actuator cylinder 42 through the one-way valve I 21, the air intake passage I, and the plug 23; when the solenoid valve 22 is energized, the compressed air in the compressed air chamber of the actuator cylinder 42 is discharged through the plug 23 and the exhaust passage I.

[0072] When the parking brake is unexpectedly applied and needs to be released, the solenoid valve 22 is energized, or the handle of the stop valve 23 is turned at the position on the vehicle corresponding to the bogie where the parking brake was unexpectedly applied. This causes the compressed air in the compressed air chamber of the actuator cylinder 42 to be emptied. Under the action of the actuator cylinder spring 425, the piston rod of the actuator cylinder 42 can pull the steel wire rope b to release the parking brake, without having to operate the release ring d under the vehicle.

[0073] Furthermore, the labor-saving system a can be integrated as a whole and installed on the vehicle, or the stop valve 23 can be installed on the vehicle and the rest can be installed under the vehicle, and the air supply line c can be connected to the air supply line 1.

[0074] Furthermore, the plug 23 is provided with an exhaust port and a handle for controlling the exhaust port switch, and the compressed air in the compressed air chamber of the actuator 42 can be discharged by turning the handle to open the exhaust port.

[0075] Furthermore, the protection module 3 includes a one-way valve II 31, a throttling plug 32, and a pneumatic valve 33; the pneumatic valve 33 includes a pneumatic regulating port (E port), an air intake passage II (P port in, A port out) and an exhaust passage II (B port in, R port out);

[0076] The second port of the one-way valve I 21 is also connected to the first port of the one-way valve II 31 and the pneumatic regulating port of the pneumatic valve 33 via pipelines; the pressure at the pneumatic regulating port is the same as the pressure at the inlet of the solenoid valve 22; the second port of the one-way valve II 31 is connected to the first port of the throttling plug 32 via pipelines; the second port of the throttling plug 32 is connected to the inlet of the pneumatic valve 33 via pipelines.

[0077] The throttling and blocking 32 is used to slow down the speed at which compressed air is introduced into the compressed air chamber of the protection cylinder 41, so that the speed at which compressed air is introduced into the compressed air chamber of the protection cylinder 41 is less than the speed at which compressed air is introduced into the compressed air chamber of the actuator cylinder 42, thereby preventing the piston of the actuator cylinder 42 from malfunctioning.

[0078] The compressed air chamber of the protective cylinder 41 is connected to the air intake passage II and the exhaust passage II of the pneumatic valve 33 through pipelines.

[0079] The movement of the valve stem inside the pneumatic valve 33 is related to the pressure at the pneumatic regulating port. The pressure at the pneumatic regulating port corresponding to the movement of the valve stem is set as a set value. The pneumatic valve 33 is also equipped with a spring for resetting the valve stem after it has moved. The set value of the pressure at the pneumatic regulating port can be determined according to the selection of the pneumatic valve 33.

[0080] When the relief and labor-saving system is in a normal state or when the parking brake device is released, the pressure at the pneumatic regulating port is greater than or equal to the set value, the valve stem is activated, the air intake passage II is opened, the exhaust passage II is closed, and compressed air is injected into the compressed air chamber of the protection cylinder 41 through the air intake passage II.

[0081] When the relief and labor-saving system is in its normal state, but the gas pressure in the compressed air chamber of the actuator 42 decreases, the pressure at the inlet of the intake passage I and the pressure at the pneumatic regulating port also decrease. When the pressure at the pneumatic regulating port decreases to less than a set value, the valve stem resets under the action of the spring, the intake passage II is closed, and the exhaust passage II is opened, so that the compressed air in the compressed air chamber of the protection cylinder 41 is discharged through the exhaust passage II to prevent the piston of the actuator 42 from malfunctioning. When the pressure at the pneumatic regulating port recovers from less than the set value to greater than or equal to the set value, the valve stem actuates, the intake passage II is opened, and the exhaust passage II is closed, so that compressed air is refilled into the compressed air chamber of the protection cylinder 41 through the intake passage II.

[0082] Furthermore, in this invention, when the relief and labor-saving system is in a normal state, the gas pressure in the compressed air chamber of the actuator 42 is the same as the gas pressure in the intake passage I. At this time, the pressure at the pneumatic adjustment port is the same as the pressure at the air inlet of the intake passage I, which is greater than or equal to the set value.

[0083] When the parking brake is released, the gas pressure in the compressed air chamber of the actuator cylinder 42 decreases and becomes less than the pressure at the air inlet of the air inlet passage I. At this time, the pressure at the pneumatic regulating port remains unchanged and is still greater than or equal to the set value.

[0084] When the relief and labor-saving system is in normal state, but the gas pressure in the compressed air chamber of the actuator cylinder 42 decreases, the gas pressure in the intake passage I and the pressure at the pneumatic regulating port also decrease. When the pressure at the pneumatic regulating port decreases to less than the set value, the valve stem is reset under the action of the spring.

[0085] Furthermore, when the relief and labor-saving system is in a normal state or when the parking brake device is released, compressed air from the air supply line 1 is filled into the compressed air chamber of the protection cylinder 41 through the one-way valve I 21, the one-way valve II 31, the throttling plug 32, and the air intake passage II; when the relief and labor-saving system is in a normal state, but the gas pressure in the compressed air chamber of the actuator cylinder 42 decreases, the compressed air in the compressed air chamber of the protection cylinder 41 is discharged through the exhaust passage II to prevent the piston of the actuator cylinder 42 from malfunctioning.

[0086] Furthermore, when the pressure at the pneumatic regulating port decreases to less than the set value, the valve stem resets under the action of the spring, causing the intake passage II to be cut off and the exhaust passage II to be opened; when the pressure at the pneumatic regulating port recovers from less than the set value to greater than or equal to the set value, the valve stem actuates under the action of pressure, returning to the state where the intake passage II is open and the exhaust passage II is cut off.

[0087] Furthermore, the protective cylinder 41 also includes a protective cylinder body 411, a protective cylinder piston 415, and a protective cylinder piston rod 416; the actuating cylinder 42 also includes an actuating cylinder body 421, an actuating cylinder piston rod 423, and an actuating cylinder piston 426.

[0088] Both the protective cylinder body 411 and the actuating cylinder body 421 are cup-shaped structures with an axial two-section stepped hole structure formed by a stepped platform inside. The stepped hole structure includes a small diameter section and a large diameter section, with the small diameter section close to the bottom of the protective cylinder body 411 and the actuating cylinder body 421.

[0089] The front end sidewalls of the large-diameter sections of the protective cylinder body 411 and the actuator cylinder body 421 are respectively provided with a protective cylinder air inlet 418 and an actuator air inlet 428; the actuator module 2 and the protective module 3 are respectively connected to the actuator air inlet 428 and the protective cylinder air inlet 418;

[0090] The protective cylinder piston 415 and the actuator piston 426 are respectively concentrically fitted and installed in the large-diameter section of the protective cylinder body 411 and the actuator cylinder body 421;

[0091] The protective cylinder spring 414 is located between the protective cylinder piston 415 and the bottom of the protective cylinder body 411; the protective cylinder spring 414 is used to provide power to the protective cylinder piston 415 and the protective cylinder piston rod 416;

[0092] The actuator spring 425 is located between the actuator piston 426 and the bottom of the actuator cylinder body 421; the actuator spring 425 is used to provide power to the actuator piston 426 and the actuator piston rod 423;

[0093] The stepped platforms inside the protective cylinder body 411 and the actuator cylinder body 421 are used to limit the axial movement of the protective cylinder piston 415 and the actuator piston 426, respectively, to avoid excessive compression of the protective cylinder spring 414 and the actuator spring 425.

[0094] One end of the protective cylinder piston rod 416 is fixedly connected to the protective cylinder piston 415, and the other end passes through the central hole of the connecting body 43 and extends into the cylinder body 421 of the actuator, with its end face in contact with the actuator piston 426.

[0095] One end of the piston rod 423 of the actuator is fixedly connected to the piston 426 of the actuator, and the other end passes through the spring 425 of the actuator and extends out from the bottom of the actuator 42 to be connected to the steel wire rope b.

[0096] Furthermore, the second interface of the plug 23 is connected to the air inlet 428 of the actuator cylinder; the air inlet 418 of the protective cylinder is connected to the air inlet passage II and the exhaust passage II of the pneumatic valve 33 respectively.

[0097] Furthermore, the connecting body 43 is a thick sheet structure, and a boss is provided axially on the center of each of the two sides of the connecting body 43; the air inlet 418 of the protective cylinder and the air inlet 428 of the actuator cylinder are respectively located on the front end sidewall of the large-diameter section corresponding to the boss inside the protective cylinder body 411 and the actuator cylinder body 421; the two bosses are used to restrict the axial movement of the protective cylinder piston 415 and the actuator cylinder piston 426, so as to prevent the protective cylinder piston 415 and the actuator cylinder piston 426 from blocking the protective cylinder air inlet 418 and the actuator cylinder air inlet 428 due to excessive stroke, resulting in poor air intake; inside the protective cylinder body 411, the protective cylinder piston 415 moves axially between the stepped platform and the boss; inside the actuator cylinder body 421, the actuator cylinder piston 426 moves axially between the stepped platform and the boss.

[0098] Furthermore, the relief device 4 also includes a sealing gasket 44 and a sealing ring 47. The sealing ring 47 is installed on the inner wall of the central hole of the connecting body 43 and is used to seal between the piston rod 416 of the protective cylinder and the central hole to prevent the gas in the compressed air chambers of the protective cylinder 41 and the actuator 42 from flowing into each other.

[0099] Furthermore, the central hole of the connector 43 extends through the two bosses; the inner wall of the central hole is provided with a groove for installing the sealing ring 47.

[0100] Furthermore, the protective cylinder 41, the connecting body 43, and the actuating cylinder 42 are fixedly connected as a whole by bolts 45 and nuts 46, making the structure of the relief device 4 more compact; the outer side of the connecting body 43, as well as the outer side of the protective cylinder body 411 and the actuating cylinder body 421 near the end of the connecting body 43, are all uniformly arranged circumferentially with four mounting holes for installing the bolts 45.

[0101] Furthermore, the protective cylinder 41 also includes a protective cylinder adjusting bolt 412 and a protective cylinder adjusting block 413; the protective cylinder adjusting block 413 is a rotating body structure and is concentrically installed within the small-diameter section of the protective cylinder body 411; the protective cylinder piston 415 is a rotating body structure; the protective cylinder spring 414 is installed between the protective cylinder adjusting block 413 and the protective cylinder piston 415; the protective cylinder adjusting bolt 412 is installed in a threaded through hole opened at the center of the bottom of the protective cylinder body 411 and fits against the protective cylinder adjusting block 413; the protective cylinder adjusting bolt 412 and the protective cylinder adjusting block 413 cooperate to adjust the spring force of the protective cylinder spring 414.

[0102] Furthermore, by rotating the protective cylinder adjusting bolt 412, the axial position of the protective cylinder adjusting block 413 within the small diameter section of the protective cylinder body 411 is adjusted, thereby compressing or releasing the protective cylinder spring 414 and adjusting the spring force of the protective cylinder spring 414.

[0103] Furthermore, the actuator 42 also includes an actuator adjusting bolt 422 and an actuator adjusting block 424; the actuator adjusting block 424 is a rotating body structure, concentrically fitted within the small-diameter section of the actuator cylinder body 421; the actuator piston 426 is a rotating body structure; the actuator spring 425 is installed between the actuator adjusting block 424 and the actuator piston 426; the actuator adjusting bolt 422 is installed in a threaded through hole at the center of the bottom of the actuator cylinder body 421 and fits against the actuator adjusting block 424; the actuator adjusting bolt 422 and the actuator adjusting block 424 cooperate to adjust the spring force of the actuator spring 425; both the actuator adjusting bolt 422 and the actuator adjusting block 424 have through holes at their centers for the actuator piston rod 423 to pass through.

[0104] Furthermore, by rotating the actuator adjusting bolt 422, the axial position of the actuator adjusting block 424 within the small diameter section of the actuator cylinder body 421 is adjusted, thereby compressing or releasing the actuator spring 425 and adjusting the spring force of the actuator spring 425.

[0105] Furthermore, one end of the piston rod 423 of the actuator cylinder is provided with an internal thread for connecting the steel wire rope b.

[0106] Furthermore, the small-diameter section of the sidewall of the protective cylinder body 411 and the actuator cylinder body 421 is provided with a breather hole I 419 and a breather hole II 429, respectively, to maintain the internal and external pressure balance of the chambers where the breather hole I 419 and the breather hole II 429 are located. If no breather hole is provided, when compressed air is filled into the piston-side chamber of the cylinder body to make the piston move axially, the pressure in the other side chamber of the piston will gradually increase, thus hindering the further movement of the piston.

[0107] Furthermore, the protective cylinder adjusting block 413 and the protective cylinder piston 415 are respectively provided with bosses along the axial direction for mounting the protective cylinder spring 414; the actuator adjusting block 424 and the actuator piston 426 are respectively provided with bosses along the axial direction for mounting the actuator spring 425.

[0108] Furthermore, locking nuts for locking the rotational position are respectively installed on the protective cylinder adjusting bolt 412 and the actuator adjusting bolt 422.

[0109] Furthermore, a protective cylinder sealing ring 417 for sealing is installed between the protective cylinder piston 415 and the inner wall of the protective cylinder body 411; an actuator cylinder sealing ring 427 for sealing is installed between the actuator piston 426 and the inner wall of the actuator cylinder body 421; and a groove for installing the protective cylinder sealing ring 417 and the actuator cylinder sealing ring 427 is respectively provided on the side of the protective cylinder piston 415 and the actuator piston 426.

[0110] Furthermore, the protective cylinder piston 415 has a threaded through hole along the axial direction for mounting the protective cylinder piston rod 416; the actuator piston 426 has a threaded through hole along the axial direction for mounting the actuator piston rod 423.

[0111] This invention can replace manual operation by using the spring action in the release device. When releasing the parking brake device, no manual pulling operation is required. The parking brake device can be released simply by controlling the solenoid valve in the control module or rotating the stop handle.

[0112] The working process of the parking brake manual remote release labor-saving system described in this invention is as follows: Figure 6-8 As shown, it can be mainly divided into three states: normal state, parking brake release state, and malfunction protection state.

[0113] (1) Normal state:

[0114] like Figure 6 and Figure 7As shown, compressed air enters the actuator cylinder 42 through the intake passage I of the one-way valve I21 and the solenoid valve 22 and the plug 23 via the actuator cylinder intake port 428. The compressed actuator cylinder spring 425 causes the actuator cylinder piston 426 to be in the upper limit position. At this time, the steel wire rope b is not under force.

[0115] Compressed air in the execution module 2 acts on the pneumatic regulating port (E port) of the pneumatic valve 33. After the pressure in the pneumatic regulating port is greater than or equal to the set value, the compressed air from the air supply line 1 enters the protective cylinder 41 through the one-way valve I 21, one-way valve II 31, throttling plug 32, air inlet passage II of the pneumatic valve 33 and air inlet 418 of the protective cylinder. It also compresses the protective cylinder spring 414, so that the protective cylinder piston 415 is in the lower limit position. Because the throttling plug 32 and the pneumatic valve 33 are set with action setting values, the speed of air filling into the protective cylinder 41 is much smaller than the speed of air filling into the execution cylinder 42, which can avoid the execution cylinder piston 426 from malfunctioning.

[0116] (2) When it is necessary to release the parking brake:

[0117] like Figure 6 and 8 As shown, by energizing the solenoid valve 22, the compressed air in the actuator cylinder 42 is discharged to the atmosphere through the exhaust passage I of the solenoid valve 22, or at the position on the vehicle corresponding to the bogie where the parking brake is accidentally applied, the compressed air in the lower chamber of the actuator cylinder 42 is discharged through the exhaust port of the plug valve 23 by turning the handle of the plug valve 23. The spring force of the actuator cylinder spring 425 in the actuator cylinder 42 is released, pushing the actuator cylinder piston 426 to move, pulling the steel wire rope b to release the parking brake device. In the whole process, the operator only needs to control the solenoid valve 22 or turn the handle of the plug valve 23. There is no need to pull the steel wire rope b or get off the vehicle to operate.

[0118] After the parking brake is released, the solenoid valve 22 is de-energized or the plug valve 23 is restored to its normal state, so that compressed air is refilled into the actuator cylinder 42, overcoming the spring force of the actuator cylinder spring 425, and the actuator cylinder piston 426 returns to its upper limit position. The entire device then returns to its normal state. During the above process, the pressure at the pneumatic regulating port of the pneumatic valve 33 is still greater than or equal to the set value, and the valve stem remains in motion, continuing to fill the protective cylinder 41 with compressed air.

[0119] (3) Malfunction protection status:

[0120] When the vehicle is parked for a long time or the actuator 2 leaks air, the compressed air pressure in the actuator 2 gradually decreases, causing the pressure at the pneumatic regulating port of the pneumatic valve 33 to fall below the set value. At this time, the valve stem of the pneumatic valve 33 moves under the action of the internal spring, causing the compressed air in the protective cylinder 41 to be discharged into the air through the exhaust passage II of the pneumatic valve 33. The piston 415 of the protective cylinder moves under the action of the spring force, acting on the lower surface of the actuator piston 426, so that the actuator piston 426 is still in the upper limit position (e.g., Figure 3 (As shown); when the compressed air pressure in the execution module 2 is restored, the pressure at the pneumatic regulating port of the pneumatic valve 33 is restored to a value greater than or equal to the set value, and the entire system returns to its normal state.

[0121] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A parked brake manual remote relief labor saving system characterized by, It comprises a wind supply pipeline (1), an execution module (2), a protection module (3) and a relief device (4); The relief device (4) comprises a protection cylinder (41) and an execution cylinder (42) which are fixedly connected by a connecting body (43); the protection cylinder (41) and the execution cylinder (42) are both internally provided with a piston structure, and are internally divided into a compressed air cavity and a spring mounting cavity by the piston structure; the compressed air cavities of the protection cylinder (41) and the execution cylinder (42) are adjacent; the piston structure comprises a piston and a piston rod; the spring mounting cavity of the protection cylinder (41) is internally provided with a protection cylinder spring (414); the piston rod of the protection cylinder (41) extends into the compressed air cavity of the execution cylinder (42) through the connecting body (43) and is in abutment with the piston of the execution cylinder (42); the spring mounting cavity of the execution cylinder (42) is internally provided with an execution cylinder spring (425); the piston rod of the execution cylinder (42) extends out of the bottom of the execution cylinder (42) through the execution cylinder spring (425) and is connected to a parking brake device of a basic brake device of a vehicle through a steel wire rope; The wind supply pipeline (1) is used for providing compressed air; the wind supply pipeline (1) is communicated to the compressed air cavities of the execution cylinder (42) and the protection cylinder (41) through the execution module (2) and the protection module (3) respectively; the execution module (2) is used for controlling the charging or discharging of compressed air into the compressed air cavity of the execution cylinder (42); The protection module (3) is used for controlling the charging or discharging of compressed air into the compressed air cavity of the protection cylinder (41); When the relief labor-saving system is in a normal state, the compressed air cavities of the execution cylinder (42) and the protection cylinder (41) are charged with compressed air through the execution module (2) and the protection module (3) respectively; When the parking brake device needs to be relieved, the compressed air cavity of the execution cylinder (42) is controlled to discharge compressed air by controlling the electromagnetic valve (22) of the execution module (2) to be electrified or by rotating the handle of the plug valve (23) of the execution module (2) to the position corresponding to the bogie on which the parking brake is unexpectedly applied, so that the piston rod of the execution cylinder (42) pulls the steel wire rope (b) to relieve the parking brake device; When the relief labor-saving system is in a normal state, but the gas pressure in the compressed air cavity of the execution cylinder (42) is reduced, the compressed air cavity of the protection cylinder (41) is controlled to discharge compressed air by the protection module (3), so as to prevent the piston of the execution cylinder (42) from being misoperated.

2. The parking brake manual remote relief labor saving system of claim 1, wherein, When there is no compressed air in the compressed air cavities of the protection cylinder (41) and the execution cylinder (42), the initial spring force of the protection cylinder spring (414) is at least three times that of the execution cylinder spring (425).

3. The parking brake manual remote relief labor saving system of claim 1, wherein, The execution module (2) comprises a one-way valve I (21), an electromagnetic valve (22) and a plug valve (23); the electromagnetic valve (22) comprises an air inlet passage I and an air outlet passage I; The first interface of the one-way valve I (21) is connected with the air supply pipeline (1), and the second interface is connected with the air inlet passage I of the electromagnetic valve (22); The first connecting port of the plug valve (23) is connected with the air inlet passage I and the air outlet passage I of the electromagnetic valve (22) respectively, and the second interface is connected with the compressed air cavity of the actuator cylinder (42); the electromagnetic valve (22) is in a normally lost power state, and the electromagnetic valve (22) is powered when it is needed to release the parking brake device; when the electromagnetic valve (22) is powered off, the air inlet passage I is conducted, the air outlet passage I is cut off, and the compressed air cavity of the actuator cylinder (42) is filled with compressed air through the air inlet passage I; When the electromagnetic valve (22) is powered, the air inlet passage I is cut off, the air outlet passage I is conducted, and the compressed air in the compressed air cavity of the actuator cylinder (42) is discharged through the air outlet passage I.

4. The parking brake manual remote relief labor saving system of claim 3, wherein, The plug valve (23) is provided with an air outlet and a handle for controlling the opening and closing of the air outlet.

5. The parking brake manual remote relief labor saving system of claim 3, wherein, The protection module (3) comprises a one-way valve II (31), a throttle (32) and a pneumatic valve (33); the pneumatic valve (33) comprises a pneumatic adjusting port, an air inlet passage II and an air outlet passage II; The second interface of the one-way valve I (21) is also connected with the first interface of the one-way valve II (31) and the pneumatic adjusting port of the pneumatic valve (33) respectively; the pressure at the pneumatic adjusting port is the same as the pressure at the air inlet port of the air inlet passage I of the electromagnetic valve (22); the second interface of the one-way valve II (31) is connected with the first interface of the throttle (32); the second interface of the throttle (32) is connected with the air inlet passage II of the pneumatic valve (33); The throttle (32) is used to slow down the speed of filling the compressed air cavity of the protection cylinder (41) with compressed air, so that the speed of filling the compressed air cavity of the protection cylinder (41) with compressed air is less than the speed of filling the compressed air cavity of the actuator cylinder (42) with compressed air; The compressed air cavity of the protection cylinder (41) is connected with the air inlet passage II and the air outlet passage II of the pneumatic valve (33) respectively; The action of the valve rod inside the pneumatic valve (33) is related to the pressure at the pneumatic adjusting port, and the pressure at the pneumatic adjusting port corresponding to the action of the valve rod is set as a set value, and a spring is further arranged in the pneumatic valve (33) to reset the valve rod; When the release labor-saving system is in a normal state or the parking brake device is released, the pressure at the pneumatic adjusting port is greater than or equal to the set value, the valve rod acts, the air inlet passage II is conducted, the air outlet passage II is cut off, and the compressed air cavity of the protection cylinder (41) is filled with compressed air through the air inlet passage II; When the relief system is in a normal state, but the gas pressure in the compression air cavity of the execution cylinder (42) is reduced, the pressure at the air inlet of the air inlet passage I and the pressure at the pneumatic adjusting port are also reduced. When the pressure at the pneumatic adjusting port is reduced to less than a set value, the valve rod is reset under the action of the spring, the air inlet passage II is cut off, the air outlet passage II is conducted, and the compressed air in the compression air cavity of the protection cylinder (41) is discharged through the air outlet passage II, preventing the piston of the execution cylinder (42) from malfunctioning; when the pressure at the pneumatic adjusting port is restored from less than the set value to greater than or equal to the set value, the valve rod is actuated, the air inlet passage II is conducted, and the air outlet passage II is cut off, and the compression air cavity of the protection cylinder (41) is recharged with compressed air through the air inlet passage II.

6. The parking brake manual remote alleviation labor saving system of claim 1, wherein, The protection cylinder (41) further comprises a protection cylinder body (411), a protection cylinder piston (415), and a protection cylinder piston rod (416); the execution cylinder (42) further comprises an execution cylinder body (421), an execution cylinder piston rod (423), and an execution cylinder piston (426); The protection cylinder body (411) and the execution cylinder body (421) are internally provided with an axial two-section stepped hole structure formed by a stepped platform, the stepped hole structure comprises a small-diameter section and a large-diameter section, and the small-diameter section is close to the bottom of the protection cylinder body (411) and the execution cylinder body (421); The large-diameter section of the protection cylinder body (411) and the execution cylinder body (421) is respectively provided with a protection cylinder air inlet hole (418) and an execution cylinder air inlet hole (428) on the front side wall; the execution module (2) and the protection module (3) are respectively communicated to the execution cylinder air inlet hole (428) and the protection cylinder air inlet hole (418); The protection cylinder piston (415) and the execution cylinder piston (426) are respectively concentrically fitted and installed in the large-diameter section of the protection cylinder body (411) and the execution cylinder body (421); The protection cylinder spring (414) is located between the protection cylinder piston (415) and the bottom of the protection cylinder body (411); the protection cylinder spring (414) is used to provide power for the protection cylinder piston (415) and the protection cylinder piston rod (416); The execution cylinder spring (425) is located between the execution cylinder piston (426) and the bottom of the execution cylinder body (421); the execution cylinder spring (425) is used to provide power for the execution cylinder piston (426) and the execution cylinder piston rod (423); The stepped platform in the protection cylinder body (411) and the execution cylinder body (421) is respectively used to limit the axial movement position of the protection cylinder piston (415) and the execution cylinder piston (426); One end of the protection cylinder piston rod (416) is fixedly connected with the protection cylinder piston (415), the other end penetrates through the center hole of the connecting body (43) and extends into the execution cylinder body (421), and the end face is in abutment with the execution cylinder piston (426); One end of the execution cylinder piston rod (423) is fixedly connected with the execution cylinder piston (426), the other end passes through the execution cylinder spring (425) and extends out of the bottom of the execution cylinder (42) and is connected to the steel wire rope.

7. A parking brake manual remote alleviation labor saving system according to claim 6, characterized in that, Two bosses are respectively arranged on the center of the two sides of the connecting body (43) in the axial direction; the protection cylinder air inlet hole (418) and the execution cylinder air inlet hole (428) are respectively located on the front sidewall of the large-diameter section of the protection cylinder cylinder body (411) and the execution cylinder cylinder body (421) corresponding to the bosses; the two bosses are respectively used for limiting the axial movement positions of the protection cylinder piston (415) and the execution cylinder piston (426).

8. The parking brake manual remote relief labor saving system of claim 6, wherein, The protection cylinder (41) further comprises a protection cylinder adjusting bolt (412) and a protection cylinder adjusting block (413); the protection cylinder adjusting block (413) is concentrically and fitly installed in the small-diameter section of the protection cylinder cylinder body (411); the protection cylinder spring (414) is installed between the protection cylinder adjusting block (413) and the protection cylinder piston (415); the protection cylinder adjusting bolt (412) is installed in the threaded through hole formed in the center of the bottom of the protection cylinder cylinder body (411) and is in close contact with the protection cylinder adjusting block (413); the protection cylinder adjusting bolt (412) and the protection cylinder adjusting block (413) are cooperated to adjust the spring force of the protection cylinder spring (414).

9. The parking brake manual remote alleviation labor saving system of claim 6, wherein, The execution cylinder (42) further comprises an execution cylinder adjusting bolt (422) and an execution cylinder adjusting block (424); the execution cylinder adjusting block (424) is concentrically and fitly installed in the small-diameter section of the execution cylinder cylinder body (421); the execution cylinder spring (425) is installed between the execution cylinder adjusting block (424) and the execution cylinder piston (426); the execution cylinder adjusting bolt (422) is installed in the threaded through hole formed in the center of the bottom of the execution cylinder cylinder body (421) and is in close contact with the execution cylinder adjusting block (424); the execution cylinder adjusting bolt (422) and the execution cylinder adjusting block (424) are cooperated to adjust the spring force of the execution cylinder spring (425); the execution cylinder adjusting bolt (422) and the execution cylinder adjusting block (424) are both provided with through holes in the centers for the execution cylinder piston rod (423) to pass through.

10. The parking brake manual remote alleviation labor saving system of claim 6, wherein, The small-diameter section sidewalls of the protection cylinder cylinder body (411) and the execution cylinder cylinder body (421) are respectively provided with a breathing hole I (419) and a breathing hole II (429) for keeping the chambers where the breathing hole I (419) and the breathing hole II (429) are located in pressure balance.

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