Electromagnetic reversing pressure-limiting valve for double-loop wet brake system

Abstract

The utility model relates to an electromagnetic reversing pressure-limiting valve for a double-loop wet-type brake system, which comprises a main valve, an anti-explosion valve and an anti-explosion valve magnet, the anti-explosion electromagnet is arranged on the anti-explosion valve and used for controlling an anti-explosion valve core of the anti-explosion valve, the anti-explosion valve is integrally arranged on a valve body of the main valve, and the anti-explosion valve magnet is arranged on the main valve. A pressure limiting valve element is arranged in the main valve, a screw plug and a pressure adjusting mechanism are arranged on a valve body, the pressure adjusting mechanism acts on the pressure limiting valve element and is used for controlling the axial displacement of the pressure limiting valve element, and the anti-explosion valve and the main valve form new A-T and A-P oil ways. The pressure-limiting valve core is controlled by the pressure regulating mechanism to limit the oil inlet pressure, so that the pressure in a brake loop is a limit value, the requirement of the valve applied to a double-loop wet type brake system is met, and by combining with the anti-explosion valve, the purpose of parking by cutting off an oil path through anti-explosion induction is achieved, the purpose of emergency braking is achieved, and accidents in emergency situations are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of a locomotive brake system, in particular to an electromagnetic reversing pressure-limiting valve for a dual-circuit wet brake system. Background Art

[0002] At present, the braking system of mining vehicles usually adopts wet brakes, and the single-circuit wet brake system is generally used. Due to the complex working environment of mining vehicles and the insecurity factors when driving, the handbrake valve used in the single-circuit wet brake system adopts an electromagnetic explosion-proof valve. In the event of an accident, the oil circuit is cut off by the induction explosion-proof valve to achieve the emergency braking function. As the models of mining vehicles become larger and larger, the single-circuit wet brake system cannot meet the braking requirements of the vehicle brake system, and braking accidents are prone to occur. Large vehicles use dual-circuit wet brake systems to meet the braking guarantee, and the brake circuit in the dual-circuit wet brake system requires a certain pressure to release the brake state, and this pressure is set according to the needs of the brake. Excessive pressure will damage the sealing structure of the brake, so this part of the pressure needs to be limited. At present, electromagnetic explosion-proof valves cannot be used in dual-circuit wet brake systems, and it is necessary to develop an electromagnetic reversing pressure-limiting valve suitable for dual-circuit wet brake systems. Utility Model Content

[0003] In view of the above problems, the utility model proposes an electromagnetic reversing pressure-limiting valve for a dual-circuit wet brake system, which switches the oil circuit and limits the oil inlet pressure by sensing an explosion-proof valve to achieve an emergency braking function.

[0004] In order to achieve the above purpose, the following technical scheme is adopted: an electromagnetic reversing pressure-limiting valve for a dual-circuit wet brake system, comprising a main valve, an explosion-proof valve and an explosion-proof valve magnet, wherein the explosion-proof electromagnet is installed on the explosion-proof valve to control the explosion-proof valve core of the explosion-proof valve, and the explosion-proof valve is integratedly installed on the valve body of the main valve to form an oil circuit with the main valve.

[0005] The valve body of the main valve includes a valve body, a pressure-limiting valve core and a rotating valve core, and the valve body includes a pressure-limiting valve core cavity, a rotating valve core cavity, an oil inlet, an oil outlet, an oil return port, a first oil inlet flow channel, a second oil inlet flow channel, an oil outlet flow channel, an oil return transfer flow channel, a first oil return flow channel, and a second oil return flow channel.

[0006] The pressure limiting valve core is installed in the pressure limiting valve core cavity. Screw plugs and pressure regulating mechanisms are respectively arranged at both ends of the pressure limiting valve core cavity. The pressure regulating mechanism acts on the pressure limiting valve core to control the axial displacement of the pressure limiting valve core.

[0007] The oil inlet and the first oil inlet flow channel are connected to the oil channel groove of the pressure limiting valve core, the second oil inlet flow channel is connected to the oil inlet chamber of the explosion-proof valve, the return oil transfer flow channel is connected to the oil return chamber of the explosion-proof valve, the first oil return flow channel and the second oil return flow channel are connected to the oil return port, and the oil outlet flow channel is connected to the oil outlet and the oil outlet chamber of the explosion-proof valve.

[0008] The rotary valve core includes a first group of channels and a second group of channels. The rotary valve core is installed in the rotary valve core cavity and the execution end is located outside the valve body and sealed with the valve body. When the rotary valve core is in the initial state, the first group of channels ensures that one section of the oil inlet flow channel is connected with the second section of the oil inlet flow channel, and at the same time, the second group of channels ensures that the return oil transfer flow channel is connected with the first return oil flow channel. When the rotary valve core has the maximum rotational displacement, the first group of channels ensures that one section of the oil inlet flow channel is connected with the second oil return flow channel, and at the same time, the second group of channels cuts off the passage between the return oil transfer flow channel and the first return oil flow channel.

[0009] Furthermore, a pressure stabilizing chamber is provided in the valve body, a pressure stabilizing ball is built in the pressure stabilizing chamber, and the pressure stabilizing chamber is respectively communicated with the oil inlet and a section of the oil inlet flow channel.

[0010] Furthermore, the pressure regulating mechanism includes a sleeve, a valve core connecting seat, a compression spring, a locking nut and an end cover, the front end of the sleeve is installed on the valve body and is connected to the pressure-limiting valve cavity, the valve core connecting seat is arranged in the sleeve and is connected to the pressure-limiting valve core, an end cover is arranged at the end of the sleeve, the locking nut is arranged in the sleeve and cooperates with the inner wall thread of the sleeve, the compression spring is assembled in the sleeve through the locking nut, and the two ends act on the valve core connecting seat and the end cover respectively, and the compression spring is adjusted to act on the valve core connecting seat by adjusting the locking nut.

[0011] Furthermore, a screw plug is installed on the valve body, an axial cavity is arranged inside the screw plug, the axial cavity is communicated with the pressure-limiting valve cavity and a valve core limiting rod is arranged inside the axial cavity, and the valve core limiting rod is used to limit the maximum axial displacement of the pressure-limiting valve core.

[0012] Furthermore, a rotating handle is installed at the execution end of the rotating valve core.

[0013] Furthermore, an oil inlet ring cavity and an oil outlet ring cavity are arranged in the valve body around the outer wall of the pressure limiting valve core, the oil inlet ring cavity is connected with the oil inlet, the oil channel groove of the pressure limiting valve core is connected with the oil inlet through the oil inlet ring cavity, the oil outlet ring cavity is connected with the oil outlet, and the oil outlet flow channel is connected with the oil outlet through the oil outlet ring cavity.

[0014] Furthermore, the pressure stabilizing chamber is communicated with the oil inlet through the oil inlet ring chamber.

[0015] Beneficial effects of the utility model: The utility model designs a pressure regulating mechanism on the valve body to control the pressure-limiting valve core to limit the oil inlet pressure, so that the pressure in the brake circuit is a limited value, which meets the requirements of the valve used in the dual-circuit wet brake system, and through the combination with the explosion-proof valve, redesigns the A-T and A-P oil circuits to achieve explosion-proof sensing to cut off the oil circuit for parking, achieve the purpose of emergency braking, and avoid accidents in emergency situations. In order to avoid the explosion-proof valve from always maintaining the parking state, the utility model designs a manual rotary valve on the valve body, and manually controls the rotary valve to switch the oil circuit to the A-P oil circuit unblocked state to avoid the situation where the vehicle cannot be towed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the front view of the utility model;

[0017] Figure 2 It is a bottom view of the utility model;

[0018] Figure 3 It is a right side view of the utility model;

[0019] Figure 4 for Figure 1 Schematic diagram of the middle AA direction;

[0020] Figure 5 for Figure 1 Schematic diagram of CC direction;

[0021] Figure 6 for Figure 2 Schematic diagram of the middle BB direction;

[0022] Figure 7 for Figure 3 Schematic diagram of the middle DD direction;

[0023] Figure 8 It is a schematic diagram of the internal structure of the rotary valve core.

[0024] As shown in the figure: 1. Valve body; 2. Pressure limiting valve core; 3. Rotating valve core; 4. Screw plug; 5. Pressure regulating mechanism; 6. Rotating handle; 7. Pressure stabilizing ball; 30. First set of channels; 31. Second set of channels; 40. Valve core limit rod; 50. Sleeve; 51. Valve core connecting seat; 52. Compression spring; 53. Locking nut; 54. End cover; 100. Main valve; 101. Oil inlet; 102. Oil outlet; 103. Oil return Inlet; 104, first oil inlet channel; 105, second oil inlet channel; 106, oil outlet channel; 107, return oil transfer channel; 108, first return oil channel; 109, second return oil channel; 110, pressure stabilizing chamber; 111, oil inlet ring chamber; 112, oil outlet ring chamber; 200, explosion-proof valve; 201, explosion-proof valve core; 202, oil inlet chamber; 203, oil outlet chamber; 204, return oil chamber; 300, explosion-proof valve magnet. DETAILED DESCRIPTION

[0025] Example 1

[0026] The following is further described with reference to the accompanying drawings: Figure 1-7 Schematic diagram of this example, an electromagnetic reversing pressure-limiting valve for a dual-circuit wet brake system, including a main valve 100, an explosion-proof valve 200 and an explosion-proof valve magnet 300, wherein the explosion-proof electromagnet 300 is installed on the explosion-proof valve 200 to control the explosion-proof valve core 201 of the explosion-proof valve 200.

[0027] The present embodiment adopts the explosion-proof valve 200 and the explosion-proof valve magnet 300 used in the hand brake valve in the single-circuit wet brake system. Since the explosion-proof valve 200 and the explosion-proof valve magnet 300 have been used and disclosed in the single-circuit wet brake system, the structural relationship between the two is not specifically introduced in this embodiment, and only part of the structure adopted in this embodiment is disclosed.

[0028] The lower end face of the explosion-proof valve 200 used in this example is integrated and assembled on the upper end face of the valve body 1 of the main valve 100 in the main viewing direction, and the end face interfaces of the oil inlet chamber 202, the oil outlet chamber 203 and the oil return chamber 204 of the explosion-proof valve 200 are designed on the lower end face of the explosion-proof valve 200 for communicating with the oil passage of the main valve 100.

[0029] Design of the main valve 100: The valve body of the main valve 100 includes a valve body 1, a pressure limiting valve core 2 and a rotating valve core 3.

[0030] The valve body 1 includes a pressure-limiting valve core chamber, a rotating valve core chamber, an oil inlet 101, an oil outlet 102, an oil return port 103, a first oil inlet flow channel 104, a second oil inlet flow channel 105, an oil outlet flow channel 106, an oil return transfer flow channel 107, a first oil return flow channel 108, a second oil return flow channel 109 and a pressure stabilizing chamber 110.

[0031] Wherein, a pressure-limiting valve core cavity is arranged in the x-axis direction of the valve body 1, a rotating valve core cavity is arranged in the y-axis direction of the valve body 1, an oil inlet 101 and an oil outlet 102 are located on the front side of the main view direction of the valve body, an oil return port 103 is located on the side of the main view direction of the valve body 1, a pressure-limiting valve core 2 is assembled in the pressure-limiting valve core cavity, a screw plug 4 and a pressure regulating mechanism 5 are assembled at both ends of the cavity of the pressure-limiting valve core cavity, an oil inlet ring cavity 111 and an oil outlet ring cavity 112 are arranged around the outer wall of the pressure-limiting valve core 2 in the valve body 1, the oil inlet ring cavity 111 is communicated with the oil inlet 101, and the oil outlet ring cavity 112 is communicated with the oil outlet 102,

[0032] like Figure 8As shown, the rotary valve core 3 includes a first group of channels 30 and a second group of channels 31. The first group of channels 30 includes two ports, wherein the first port is used to communicate with a first section of the oil inlet flow channel 104, and the second port is used to communicate with a second section of the oil inlet flow channel 105. After the rotary valve core 3 is rotated, the first port is changed to be used to communicate with the second oil return flow channel 109, and the second port is changed to be used to communicate with a first section of the oil inlet flow channel 104; the second group of channels 31 also includes two ports, wherein the first port is communicated with the oil return transfer flow channel 107, and the second port is communicated with the first oil return flow channel 108. The rotary valve core 3 is installed in the rotary valve core cavity and the execution end is located outside the valve body 1 and is sealed with the valve body 1. The execution end of the rotary valve core 3 is installed with a rotating handle 6.

[0033] Arrangement of each flow channel in the valve body 1: the oil channel groove of the pressure limiting valve core 2 is communicated with the oil inlet ring cavity 111 and the first oil inlet flow channel 104 respectively, the second oil inlet flow channel 105 is communicated with the oil inlet cavity 202 of the explosion-proof valve 2, the return oil transfer flow channel 107 is communicated with the return oil cavity 204 of the explosion-proof valve 2, the first return oil flow channel 108 and the second return oil flow channel 109 are communicated with the return oil port 103, the oil outlet flow channel 106 is communicated with the oil outlet ring cavity 112 and the oil outlet cavity 203 of the explosion-proof valve 2, the pressure stabilizing cavity 110 has a built-in pressure stabilizing ball 7, and the pressure stabilizing cavity 110 is respectively connected to the oil inlet ring cavity 111 and the first oil inlet cavity 202. The oil flow channel 104 is connected, and the pressure stabilizing ball 7 is restricted in the pressure stabilizing chamber 110, and the rotary valve core 3 is assembled, so that when the rotary valve core 3 is in the initial state, the first group of channels 30 ensures that the first section of the oil inlet flow channel 104 is connected with the second section of the oil inlet flow channel 105, and the second group of channels 31 ensures that the return oil transfer flow channel 107 is connected with the first return oil flow channel 108. When the rotary valve core 3 has the maximum rotation displacement, the first group of channels 30 ensures that the first section of the oil inlet flow channel 104 is connected with the second return oil flow channel 109, and the second group of channels 31 cuts off the passage between the return oil transfer flow channel 107 and the first return oil flow channel 108.

[0034] Design of the pressure regulating mechanism 5: The pressure regulating mechanism 5 includes a sleeve 50, a valve core connecting seat 51, a compression spring 52, a locking nut 53 and an end cover 54. The front end of the sleeve 50 is installed on the valve body 1 and is connected to the pressure limiting valve cavity. The valve core connecting seat 51 is arranged in the sleeve 50 and is connected to the pressure limiting valve core 2. The end of the sleeve 50 is provided with an end cover 54. The locking nut 53 is arranged in the sleeve 50 and is threadedly matched with the inner wall of the sleeve 50. The compression spring 52 is assembled in the sleeve 50 through the locking nut 53, and the two ends act on the valve core connecting seat 51 and the end cover 54 respectively. The compression spring 52 is adjusted to act on the valve core connecting seat 51 by adjusting the locking nut 53.

[0035] Design of the screw plug 4: The screw plug 4 is installed on the valve body 1, and an axial cavity is arranged inside the screw plug 4. The axial cavity is connected with the pressure-limiting valve cavity and a valve core limit rod 40 is arranged inside. The valve core limit rod 40 is used to limit the maximum axial displacement of the pressure-limiting valve core 2.

[0036] Before application, the hydraulic oil pressure required for the oil outlet 102 is determined according to the pressure required to release the brake braking state. First, an external pressure gauge is connected to the oil return port 103, and the end cover 54 of the pressure regulating mechanism 5 is opened. The tightness of the compression spring 52 is adjusted by adjusting the tightness of the locking nut 53. The tightness of the compression spring 52 determines the position of the valve core connecting seat 51 driving the pressure limiting valve core 2, that is, it determines the connection area between the oil inlet ring cavity 111 and the oil channel groove of the pressure limiting valve core 2. The connection area between the two determines the return or oil output of the hydraulic oil, and then determines the pressure of the hydraulic oil entering the oil return port 103. When the value of the pressure gauge reaches the required pressure, stop adjusting the locking nut 53. The pressure of the oil return port 103 is equal to the pressure of the oil outlet 102. The pressure stabilizing ball 7 is located between the AP passages to play a role in stabilizing pressure.

[0037] Working principle: Usually the oil inlet 101 is recorded as P port, the oil outlet 102 is recorded as T port, and the oil return port 103 is recorded as A port.

[0038] The first situation is when the explosion-proof valve 200 is in normal use: the rotary valve core 3 is in the initial position, that is, the first group of channels 30 is in a position connected with the first oil inlet channel 104 and the second oil inlet channel 105, and the second group of channels 31 is in a position connected with the oil return transfer channel 107 and the first oil return channel 108.

[0039] When driving normally, the explosion-proof valve 200 is in a normal state, the oil channel groove of the explosion-proof valve core 201 of the explosion-proof valve 200 is in a position connected with the oil inlet chamber 202 of the explosion-proof valve 200 and the oil return chamber 204 of the explosion-proof valve, cutting off the connecting circuit between the oil outlet chamber 203 of the explosion-proof valve and the oil return chamber 204 of the explosion-proof valve. At this time, the oil inlet 101—the oil inlet ring chamber 111—the first oil inlet flow channel 104—the first group of channels 30 of the rotary valve core 3—the second group of oil inlet flow channels 105—the oil inlet chamber 202 of the explosion-proof valve 200—the oil return chamber 204 of the explosion-proof valve 200—the return oil transfer flow channel 107—the second group of channels 31 of the rotary valve core 3—the first oil return flow channel 108—the return oil port 103 are connected, and the hydraulic oil enters from the oil inlet 101 along this passage and returns from the oil return port 103 to form an AP passage, and the AP passage is in the driving state.

[0040] When the vehicle is parked normally, the explosion-proof electromagnet 300 senses, and the electromagnetic rod of the explosion-proof electromagnet 300 moves, switching the oil channel groove of the explosion-proof valve core 201 of the explosion-proof valve 200 to a position connected to the oil outlet chamber 203 of the explosion-proof valve 200 and the oil return chamber 204 of the explosion-proof valve 200, cutting off the connecting circuit between the oil inlet chamber 202 of the explosion-proof valve 200 and the oil return chamber 204 of the explosion-proof valve 200. At this time, the oil circuit of the oil inlet chamber 202 of the explosion-proof valve 200 is cut off. The oil path of the hydraulic oil entering from the oil inlet 101 is cut off, and the oil return port 103—the first oil return channel 108—the second group of channels 31 of the rotary valve core 3—the return oil transfer channel 107—the return oil chamber 204 of the explosion-proof valve 200—the oil outlet chamber 203 of the explosion-proof valve 200—the oil outlet channel 106—the oil outlet ring chamber 112—the oil outlet port 102 are connected, namely, the AT passage. The hydraulic oil is unloaded along this passage, that is, it is in the parking state.

[0041] The second situation is when the vehicle is in the parking state and the explosion-proof solenoid 300 or the explosion-proof valve 200 fails, it is in the AT passage state and cannot be towed normally. Then the valve core 3 is twisted to the maximum rotational displacement, and the second group of channels 31 cuts off the passage between the return oil transfer channel 107 and the first return oil channel 108, that is, the AT passage is cut off, and the first group of channels 30 of the valve core 3 cuts off the passage between one section of the oil inlet channel 104 and the second section of the oil inlet channel 105. At the same time, the first group of channels 30 is twisted to connect one section of the oil inlet channel 104 with the second return oil channel 109, that is, the oil inlet port 101—oil inlet ring cavity 111—one section of the oil inlet channel 104—the second group of channels 31 of the valve core 3—the second return oil channel 109—the return oil port 103 are connected, and a new AP passage is formed again to achieve towing.

[0042] The present invention is not limited to the present embodiment, and any equivalent concepts or changes within the technical scope disclosed in the present invention are included in the protection scope of the present invention.

Claims

1. An electromagnetic reversing pressure-limiting valve for a dual-circuit wet brake system, characterized in that: The explosion-proof valve (200) comprises a main valve (100), an explosion-proof valve (200) and an explosion-proof valve magnet (300). The explosion-proof electromagnet (300) is installed on the explosion-proof valve (200) and is used to control the explosion-proof valve core (201) of the explosion-proof valve (200). The explosion-proof valve (200) is integrally installed on the valve body (1) of the main valve (100) and forms an oil circuit with the main valve (100). The valve body of the main valve (100) comprises a valve body (1), a pressure-limiting valve core (2) and a rotating valve core (3); the valve body (1) comprises a pressure-limiting valve core cavity, a rotating valve core cavity, an oil inlet (101), an oil outlet (102), an oil return port (103), a first oil inlet flow channel (104), a second oil inlet flow channel (105), an oil outlet flow channel (106), an oil return transfer flow channel (107), a first oil return flow channel (108) and a second oil return flow channel (109). The pressure limiting valve core (2) is installed in the pressure limiting valve core cavity. A screw plug (4) and a pressure regulating mechanism (5) are respectively arranged at both ends of the pressure limiting valve core cavity. The pressure regulating mechanism (5) acts on the pressure limiting valve core (2) to control the axial displacement of the pressure limiting valve core (2). The oil inlet (101) and a first oil inlet flow channel (104) are in communication with the oil channel groove of the pressure limiting valve core (2); the second oil inlet flow channel (105) is in communication with the oil inlet chamber (202) of the explosion-proof valve (200); the oil return transfer flow channel (107) is in communication with the oil return chamber (204) of the explosion-proof valve (200); the first oil return flow channel (108) and the second oil return flow channel (109) are in communication with the oil return port (103); the oil outlet flow channel (106) is in communication with the oil outlet (102) and the oil outlet chamber (203) of the explosion-proof valve (200); The rotary valve core (3) comprises a first group of channels (30) and a second group of channels (31). The rotary valve core (3) is installed in the rotary valve core cavity and the execution end is located outside the valve body (1) and is sealed with the valve body (1). When the rotary valve core (3) is in the initial state, the first group of channels (30) ensures that the first section of the oil inlet flow channel (104) is connected to the second section of the oil inlet flow channel (105), and the second group of channels (31) ensures that the return oil transfer flow channel (107) is connected to the first return oil flow channel (108). When the rotary valve core (3) has the maximum rotation displacement, the first group of channels (30) ensures that the first section of the oil inlet flow channel (104) is connected to the second return oil flow channel (109), and the second group of channels (31) cuts off the passage between the return oil transfer flow channel (107) and the first return oil flow channel (108).

2. The electromagnetic reversing pressure limiting valve according to claim 1, characterized in that: The valve body (1) is provided with a pressure stabilizing chamber (110), a pressure stabilizing ball (7) is built in the pressure stabilizing chamber (110), and the pressure stabilizing chamber (110) is respectively connected to the oil inlet (101) and a section of the oil inlet channel (104).

3. The electromagnetic reversing pressure limiting valve according to claim 2, characterized in that: The pressure regulating mechanism (5) comprises a sleeve (50), a valve core connecting seat (51), a compression spring (52), a locking nut (53) and an end cover (54); the front end of the sleeve (50) is mounted on the valve body (1) and communicated with the pressure limiting valve cavity; the valve core connecting seat (51) is arranged in the sleeve (50) and connected to the pressure limiting valve core (2); the end cover (54) is arranged at the end of the sleeve (50); the locking nut (53) is arranged in the sleeve (50) and is threadedly matched with the inner wall of the sleeve (50); the compression spring (52) is assembled in the sleeve (50) through the locking nut (53), and the two ends act on the valve core connecting seat (51) and the end cover (54) respectively; the compression spring (52) is adjusted to act on the valve core connecting seat (51) by adjusting the locking nut (53).

4. The electromagnetic reversing pressure limiting valve according to claim 3, characterized in that: The screw plug (4) is installed on the valve body (1), an axial cavity is arranged in the screw plug (4), the axial cavity is communicated with the pressure-limiting valve cavity and a valve core limiting rod (40) is arranged in the axial cavity, and the valve core limiting rod (40) is used to limit the maximum axial displacement of the pressure-limiting valve core (2).

5. The electromagnetic reversing pressure-limiting valve according to claim 4, characterized in that: A rotating handle (6) is installed at the execution end of the rotary valve core (3).

6. The electromagnetic reversing pressure limiting valve according to claim 5, characterized in that: An oil inlet ring cavity (111) and an oil outlet ring cavity (112) are arranged in the valve body (1) around the outer wall of the pressure limiting valve core (2); the oil inlet ring cavity (111) is connected to the oil inlet port (101); the oil channel groove of the pressure limiting valve core (2) is connected to the oil inlet port (101) through the oil inlet ring cavity (111); the oil outlet ring cavity (112) is connected to the oil outlet port (102); and the oil outlet flow channel (106) is connected to the oil outlet port (102) through the oil outlet ring cavity (112).

7. The electromagnetic reversing pressure-limiting valve according to any one of claims 2 to 5, characterized in that: The pressure stabilizing chamber (110) is connected to the oil inlet (101) via the oil inlet ring chamber (111).

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