A brake control valve

Abstract

This disclosure relates to a brake control valve, wherein a pressure reducing unit and a sequence unit are provided on the control valve body; the pressure reducing valve body is provided with a pressure reducing valve outlet; the sequence unit's sequence valve body is provided with a sequence valve inlet, a sequence valve outlet, and a sequence valve drain port, and the sequence valve core is provided with a first conductive part and a second conductive part; the sequence valve core has an open position and a closed position. In the open position, the sequence valve core is configured to connect the sequence valve inlet and the sequence valve outlet through the first conductive part; in the closed position, the sequence valve core is configured to connect the sequence valve outlet and the sequence valve drain port through the second conductive part. The pressure reducing unit and the sequence unit are integrally provided on the control valve body, which has a compact structure, requires no installation, provides high oil circuit sealing for hydraulic oil, and the second conductive part enables rapid oil drainage, effectively improving the response speed and sensitivity of the brake control valve.

Description

Technical Field

[0001] This disclosure relates to the field of hydraulic technology, and specifically to a brake control valve. Background Technology

[0002] Hydraulic systems are widely used in industrial automation, intelligent construction machinery, electro-hydraulic servo control, and other fields. In construction machinery, brakes are generally hydraulically controlled. In existing technology, a sequence valve and a pressure-reducing valve are connected and stacked. This requires fixing the sequence valve and pressure-reducing valve together with long screws and mounting plates, making assembly cumbersome and prone to oil leakage at the joint surfaces. This results in poor performance, high maintenance costs, and slow pressure release when the brake is closed. Furthermore, based on these problems with existing technology, those skilled in the art urgently need to provide a brake control valve. Summary of the Invention

[0003] This disclosure provides a brake control valve to address the problems existing in the prior art.

[0004] According to the present disclosure, a brake control valve includes a control valve body and a frame that houses the control valve body, wherein the control valve body is provided with a pressure reducing unit and a sequential unit located above the pressure reducing unit; The pressure reducing unit includes a pressure reducing valve body and a pressure reducing valve core. The pressure reducing valve body is configured to have a pressure reducing valve cavity, and the pressure reducing valve core is configured to be movably connected in the pressure reducing valve cavity. The pressure reducing valve body is provided with a pressure reducing valve inlet and a pressure reducing valve outlet located at both ends of the pressure reducing valve cavity. The sequence unit includes a sequence valve body and a sequence valve core. The sequence valve body is configured to have a sequence valve cavity, and the sequence valve core is configured to be movably connected within the sequence valve cavity. The sequence valve body has a sequence valve inlet communicating with the outlet of the pressure reducing valve, a sequence valve outlet communicating with the brake control end, and a sequence valve drain port. The sequence valve core has a first conductive portion communicating with the sequence valve inlet and the sequence valve outlet, and a second conductive portion communicating with the sequence valve outlet and the sequence valve drain port. The sequence valve core has an open position and a closed position. In the open position, the sequence valve core is configured to communicate with the sequence valve inlet and the sequence valve outlet through the first conductive portion, blocking the passage between the sequence valve outlet and the sequence valve drain port. In the closed position, the sequence valve core is configured to communicate with the sequence valve outlet and the sequence valve drain port through the second conductive portion, blocking the sequence valve inlet and the sequence valve outlet.

[0005] In one embodiment of this disclosure, both the first conductive portion and the second conductive portion are annular grooves formed on the outer peripheral surface of the sequential valve core.

[0006] In one embodiment of this disclosure, the sequence unit includes a sequence valve seat, a pilot control oil circuit opened in the sequence valve seat, and a sequence valve return spring connected to one end of the sequence valve core. The other end of the sequence valve core is located in a pilot chamber communicating with the pilot control oil circuit. The control oil pressure in the pilot chamber is less than the set pressure of the sequence valve core, and the sequence valve return spring pushes the sequence valve core to the closed position, and the sequence valve outlet and the sequence valve drain port are connected. The control oil pressure in the pilot chamber is greater than the set pressure of the sequence valve core, and pushes the sequence valve core to the open position, and the sequence valve inlet and the sequence valve outlet are connected.

[0007] In one embodiment of this disclosure, the sequence unit includes an adjustment portion assembled to the frame, the output end of which is fixedly connected to the sequence valve reset spring.

[0008] In one embodiment of this disclosure, the control valve body is provided with a first oil passage, a pressure reducing valve outlet passage communicating with the pressure reducing valve outlet, and a sequence valve inlet passage communicating with the sequence valve inlet. The first oil passage is configured to connect the pressure reducing valve outlet passage and the sequence valve inlet passage.

[0009] In one embodiment of this disclosure, the pressure reducing valve outlet passage and the sequence valve inlet passage are configured to be arranged along a first direction, the first passage being configured to be arranged along a second direction, the first direction being perpendicular to the second direction.

[0010] In one embodiment of this disclosure, the control valve body is provided with a control valve drain port and a drain passage connecting the control valve drain port and the sequence valve drain port.

[0011] In one embodiment of this disclosure, the pressure reducing valve core is provided with a pressure reducing oil passage, the inlet of the pressure reducing oil passage is connected to the oil inlet of the pressure reducing valve, and the outlet of the pressure reducing oil passage is connected to the oil outlet of the pressure reducing valve.

[0012] In one embodiment of this disclosure, a shuttle valve unit is included, which is disposed on the control valve body. The shuttle valve unit has a shuttle valve body and a shuttle valve outlet opened in the shuttle valve body. The shuttle valve outlet is connected to the pressure reducing valve inlet.

[0013] In one embodiment of this disclosure, the control valve body is further provided with a second oil passage, the second oil passage being provided with damping, and the second oil passage being configured to connect the oil outlet of the shuttle valve and the oil inlet of the pressure reducing valve.

[0014] One beneficial effect of this disclosure is that the brake control valve includes a control valve body and a frame accommodating the control valve body. The control valve body is provided with a pressure reducing unit and a sequence unit located above the pressure reducing unit. The pressure reducing unit includes a pressure reducing valve body and a pressure reducing valve core. The pressure reducing valve body is configured to have a pressure reducing valve cavity, and the pressure reducing valve core is configured to be movably connected within the pressure reducing valve cavity. The pressure reducing valve body is provided with a pressure reducing valve inlet at one end of the pressure reducing valve cavity and a pressure reducing valve outlet at the other end. The sequence unit includes a sequence valve body and a sequence valve core. The sequence valve body is configured to have a sequence valve cavity, and the sequence valve core is configured to be movably connected within the sequence valve cavity. The sequence valve body is provided with a connection to the pressure reducing valve outlet. The sequence valve has an inlet, an outlet, and a drain port. The sequence valve core has a first conductive portion connecting the inlet and outlet, and a second conductive portion connecting the outlet and drain port. The sequence valve core has an open position and a closed position. In the open position, the sequence valve core is configured to connect the inlet and outlet through the first conductive portion, blocking the passage between the outlet and drain port. In the closed position, the sequence valve core is configured to connect the outlet and drain port through the second conductive portion, blocking both the inlet and outlet ports.

[0015] During the operation of the brake control valve provided in this disclosure, the first shuttle valve inlet and the second shuttle valve inlet of the shuttle valve unit select the side with high hydraulic pressure for oil intake, while the other side with low hydraulic pressure is blocked by a steel ball. The oil then enters the pressure reducing unit through the shuttle valve outlet of the shuttle valve unit to reduce the hydraulic pressure. One end of the sequence valve core is in the initial position under the initial set force, that is, when the sequence valve core is in the closed position, the second conducting part connects the sequence valve outlet and the sequence valve drain port. The sequence valve core blocks the sequence valve inlet and the sequence valve outlet. At this time, the pressure at the sequence valve outlet is zero. The other end of the sequence valve core is subjected to a pushing force opposite to the initial set force. As the pushing force gradually increases to reach the set threshold, it pushes the sequence valve core to the open position, connecting the sequence valve inlet and outlet at the first conductive part, blocking the passage between the sequence valve outlet and the sequence valve drain port. The high-pressure hydraulic oil from the shuttle valve unit is depressurized by the pressure reducing unit and flows from the pressure reducing valve outlet through the sequence valve inlet to the sequence valve outlet. It is then transmitted from the sequence valve outlet to the control end of the brake, thereby opening the brake. When the pushing force gradually decreases, under the action of the initial set force, the sequence valve core moves to the closed position, connecting the sequence valve core outlet and the sequence valve core drain port at the second conductive part, blocking the sequence valve core inlet and outlet, thereby relieving the pressure of the hydraulic oil transmitted to the brake control end and closing the brake. Compared with the prior art, this disclosure optimizes the structure of the brake control valve. In particular, the pressure reducing unit for reducing the hydraulic oil pressure in the main oil circuit and the sequence unit located above the pressure reducing unit are integrated on the control valve body. The structure is compact and requires no installation. The hydraulic oil circuit has high sealing performance, effectively eliminating the oil leakage phenomenon in the prior art and reducing maintenance costs. Furthermore, the oil outlet of the sequence valve of this brake control valve can be directly connected through the second conductive part on the sequence valve core, which can quickly drain oil and effectively improve the response speed and sensitivity of the brake control valve, thereby enabling the brake to quickly reset and close, improving working efficiency.

[0016] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments of the present disclosure and, together with their description, serve to explain the principles of the present disclosure.

[0018] Figure 1 This is a front view of the brake control valve provided in an embodiment of this disclosure; Figure 2 yes Figure 1 Sectional view of AA; Figure 3 This is a side view of the brake control valve in an embodiment of this disclosure; Figure 4 yes Figure 3 A schematic diagram of the sequential valve core in the closed position, shown in the sectional view below (BB). Figure 5 yes Figure 3 Schematic diagram of the sequential valve core in the open position (see BB section). Figure 6 This is a schematic diagram of the structure of the sequence valve core in an embodiment of this disclosure; Figure 7 This is a schematic diagram illustrating the working principle of the brake control valve in this embodiment.

[0019] Figures 1 to 7 The one-to-one correspondence between the component names and the reference numerals in the figures is as follows: 100 Brake control valve, 101 Control valve body, 102 Control valve drain port, 103 Assembly cavity, 103a Boss, 104 End cap; 110 Pressure reducing unit, 111 Pressure reducing valve body, 112 Pressure reducing valve core, 113 Pressure reducing valve inlet, 114 Pressure reducing valve outlet; 120 Sequence unit, 121 Sequence valve body, 122 Sequence valve core, 123 Sequence valve inlet, 124 Sequence valve outlet, 125 Sequence valve drain port, 126 Sequence valve seat, 127 Sequence valve return spring, 128 Adjustment part, 1281 Adjustment rod, 1282 Adjustment sleeve, 129 Connecting base; 130 Shuttle valve unit, 131 Shuttle valve body, 132 Shuttle valve outlet, 133 First shuttle valve inlet, 134 Second shuttle valve inlet; 122a First conducting section, 122b Second conducting section, 100a First oil passage, 100b Second oil passage, 100d Oil drain passage, 110a Pressure reducing valve outlet passage, 110b Pressure reducing oil passage, 110c Pressure reducing valve inlet passage, 120a Sequence valve inlet passage, 120b Pilot control oil circuit, 120c Pilot chamber, 130a Shuttle valve outlet passage. Detailed Implementation

[0020] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that, 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 present disclosure.

[0021] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use.

[0022] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0023] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0024] In this article, terms such as "up," "down," "front," "back," "left," and "right" are used only to indicate the relative positional relationship between related parts, rather than to define the absolute position of these related parts.

[0025] In this article, "first," "second," etc., are used only to distinguish one another, and not to indicate degree of importance, order, or prerequisite for each other.

[0026] In this document, terms such as “equal” and “same” are not strict mathematical and / or geometric limitations, but also include errors that are understandable to those skilled in the art and permissible in manufacturing or use.

[0027] This disclosure provides a brake control valve, which includes a control valve body and a frame housing the control valve body. The control valve body has a pressure reducing unit and a sequence unit located above the pressure reducing unit. The pressure reducing unit includes a pressure reducing valve body and a pressure reducing valve core. The pressure reducing valve body is configured to have a pressure reducing valve cavity, and the pressure reducing valve core is configured to be movably connected within the pressure reducing valve cavity. The pressure reducing valve body has a pressure reducing valve inlet at one end of the pressure reducing valve cavity and a pressure reducing valve outlet at the other end. The sequence unit includes a sequence valve body and a sequence valve core. The sequence valve body is configured to have a sequence valve cavity, and the sequence valve core is configured to be movably connected within the sequence valve cavity. The sequence valve body has a connection to the pressure reducing valve outlet. The oil port has a sequence valve inlet, a sequence valve outlet connected to the brake control end, and a sequence valve drain port. The sequence valve core has a first conductive part connecting the sequence valve inlet and the sequence valve outlet, and a second conductive part connecting the sequence valve outlet and the sequence valve drain port. The sequence valve core has an open position and a closed position. In the open position, the sequence valve core is configured to connect the sequence valve inlet and the sequence valve outlet through the first conductive part, blocking the passage between the sequence valve outlet and the sequence valve drain port. In the closed position, the sequence valve core is configured to connect the sequence valve outlet and the sequence valve drain port through the second conductive part, blocking the sequence valve inlet and the sequence valve outlet.

[0028] During the operation of the brake control valve provided in this disclosure, one end of the sequence valve core is located in the initial position under the initial set force, that is, when the sequence valve core is in the closed position, the second conduction part connects the oil outlet of the sequence valve and the oil drain port of the sequence valve, and the sequence valve core blocks the oil inlet of the sequence valve and the oil outlet of the sequence valve. At this time, the pressure at the oil outlet of the sequence valve is zero. The other end of the sequence valve core is subjected to a pushing force opposite to the initial set force. As the pushing force gradually increases to reach the set threshold, it pushes the sequence valve core to the open position, connecting the sequence valve inlet and outlet at the first conductive part, blocking the passage between the sequence valve outlet and the sequence valve drain port. The hydraulic oil, after being depressurized by the pressure reducing unit, flows from the pressure reducing valve outlet through the sequence valve inlet to the sequence valve outlet, and is then transmitted from the sequence valve outlet to the control end of the brake, thereby opening the brake. When the pushing force gradually decreases, under the action of the initial set force, the sequence valve core moves to the closed position, connecting the sequence valve core outlet and the sequence valve core drain port at the second conductive part, blocking the sequence valve core inlet and outlet, thereby relieving the pressure of the hydraulic oil transmitted to the brake control end and closing the brake. Compared with the prior art, this disclosure optimizes the structure of the brake control valve. In particular, the pressure reducing unit for reducing the hydraulic oil pressure in the main oil circuit and the sequence unit located above the pressure reducing unit are integrated on the control valve body. The structure is compact and requires no installation. The hydraulic oil circuit has high sealing performance, effectively eliminating the oil leakage phenomenon in the prior art and reducing maintenance costs. Furthermore, the oil outlet of the sequence valve of this brake control valve can be directly connected through the second conductive part on the sequence valve core, which can quickly drain oil and effectively improve the response speed and sensitivity of the brake control valve, thereby enabling the brake to quickly reset and close, improving working efficiency.

[0029] The following is in conjunction with the appendix Figures 1 to 7 Specific embodiments of this disclosure will be described.

[0030] refer to Figure 1 and Figure 3This disclosure provides a brake control valve 100, which includes a control valve body 101 and a frame housing the control valve body 101. The control valve body 101 is equipped with a pressure reducing unit 110 and a sequence unit 120 located above the pressure reducing unit 110. This configuration allows the control valve body 101 to support and bear the medium pressure for the various components of the pressure reducing unit 110 and the sequence unit 120. In other words, the pressure reducing unit 110, the various structural components of the sequence unit 120, and the connecting oil passages are all located on the control valve body 101, forming an integrated brake control valve 100 that combines pressure reducing and sequence functions. This effectively reduces the potential for oil leakage in existing brake control valves 100 and improves the stability of hydraulic oil pressure. The pressure reducing unit 110 reduces the high-pressure hydraulic oil to a set pressure and maintains stable pressure after the hydraulic oil flows out of the pressure reducing unit 110, providing a stable and safe working pressure for the sequence unit 120. The sequence unit 120 is used to provide working pressure to the brake actuator and to directly and quickly depressurize the brake actuator.

[0031] like Figure 2 and Figure 4 As shown, the pressure reducing unit 110 includes a pressure reducing valve body 111 and a pressure reducing valve core 112. The pressure reducing valve body 111 is configured to have a pressure reducing valve cavity, and the pressure reducing valve core 112 is configured to be movably connected in the pressure reducing valve cavity. The pressure reducing valve body 111 is provided with a pressure reducing valve inlet 113 and a pressure reducing valve outlet 114 located at both ends of the pressure reducing valve cavity.

[0032] like Figure 4 and Figure 5 As shown, the sequence unit 120 includes a sequence valve body 121 and a sequence valve core 122. The sequence valve body 121 is configured to have a sequence valve cavity, and the sequence valve core 122 is configured to be movably connected within the sequence valve cavity. The sequence valve body 121 is provided with a sequence valve inlet 123 communicating with the pressure reducing valve outlet 114, a sequence valve outlet 124 communicating with the brake control end, and a sequence valve drain port 125; combined with Figure 4 and Figure 6As shown, the sequence valve core 122 is provided with a first conductive part 122a that connects the sequence valve inlet 123 and the sequence valve outlet 124, and a second conductive part 122b that connects the sequence valve outlet 124 and the sequence valve drain port 125. The sequence valve core 122 has an open position and a closed position. When it is in the open position, the sequence valve core 122 is configured to connect the sequence valve inlet 123 and the sequence valve outlet 124 through the first conductive part 122a, and block the passage between the sequence valve outlet 124 and the sequence valve drain port 125. When it is in the closed position, the sequence valve core 122 is configured to connect the sequence valve outlet 124 and the sequence valve drain port 125 through the second conductive part 122b, and block the sequence valve inlet 123 and the sequence valve outlet 124.

[0033] The pressure reducing unit 110 and the sequence unit 120 are disposed on the control valve body 101. The pressure reducing valve body 111 and the sequence valve body 121 are two functional unit parts of the control valve body 101. That is to say, the control valve body 101 forms a pressure reducing valve body 111 and a sequence valve body 121 arranged vertically.

[0034] During the operation of the brake control valve 100 provided in this disclosure, such as Figure 4 As shown, one end of the sequence valve core 122 is in the initial position under the initial set force, that is, when the sequence valve core 122 is in the closed position, the second conducting part 122b connects the sequence valve outlet 124 and the sequence valve drain port 125, and the sequence valve core 122 blocks the sequence valve inlet 123 and the sequence valve outlet 124. At this time, the pressure at the sequence valve outlet 124 is zero. Figure 5As shown, the other end of the sequence valve core 122 is subjected to a pushing force opposite to the initial set force. As the pushing force gradually increases to reach the set threshold, it pushes the sequence valve core 122 to move to the open position, connecting the sequence valve inlet 123 and the sequence valve outlet 124 through the first conductive part 122a, blocking the passage between the sequence valve outlet 124 and the sequence valve drain port 125. The hydraulic oil, after being depressurized by the pressure reducing unit 110, flows from the pressure reducing valve outlet 114 through the sequence valve inlet 123 to... The oil outlet 124 of the sequence valve transmits the oil to the control end of the brake, thereby opening the brake. When the pushing force gradually decreases, under the action of the initial set force, the sequence valve core 122 moves to the closed position, connecting the oil outlet and the drain port of the sequence valve core 122 to the second conduction part 122b, blocking the oil inlet and outlet of the sequence valve core 122, thereby relieving the pressure of the hydraulic oil transmitted to the control end of the brake and closing the brake. Compared with the prior art, this disclosure optimizes the structure of the brake control valve 100. In particular, the pressure reducing unit 110 for reducing the hydraulic oil pressure in the main oil circuit and the sequence unit 120 located above the pressure reducing unit 110 are integrally mounted on the control valve body 101. The structure is compact and requires no installation. The hydraulic oil circuit has high sealing performance, effectively eliminating the oil leakage phenomenon in the prior art and reducing maintenance costs. Furthermore, the oil outlet 124 of the sequence valve of the brake control valve 100 can be directly connected through the second conductive part 122b on the sequence valve core 122, which can quickly drain oil and effectively improve the response speed and sensitivity of the brake control valve 100, thereby enabling the brake to quickly reset and close, and improving working efficiency.

[0035] In one embodiment of this disclosure, the first conducting portion 122a and the second conducting portion 122b are both annular grooves formed on the outer peripheral surface of the sequence valve core 122, and the first conducting portion 122a and the second conducting portion 122b are arranged along the axial direction of the sequence valve core 122. With the structure of the sequence valve core 122 of the brake control valve 100, the structure of the first conducting portion 122a and the second conducting portion 122b allows for convenient and rapid opening and closing when the sequence valve core 122 moves axially. In particular, the second conducting portion 122b can directly connect the sequence valve outlet 124 and the sequence valve drain port 125, directly and quickly relieving the pressure at the sequence valve outlet 124, rapidly reducing the pressure inside the brake, and quickly responding to the brake closing action.

[0036] Combination Figure 4 and Figure 5As shown, the sequence unit 120 includes a sequence valve seat 126, a pilot control oil circuit 120b opened in the sequence valve seat 126, and a sequence valve return spring 127 connected to one end of the sequence valve core 122. The other end of the sequence valve core 122 is located in the pilot chamber 120c connected to the pilot control oil circuit 120b. The control oil circuit pressure in the pilot chamber 120c is less than the set pressure of the sequence valve core 122. The sequence valve return spring 127 pushes the sequence valve core 122 to the closed position, and the sequence valve outlet 124 and the sequence valve drain port 125 are connected. When the control oil pressure in the pilot chamber 120c is greater than the set pressure of the sequence valve core 122, the sequence valve core 122 is pushed to the set pressure of the sequence valve core 122, and the sequence valve core 122 is pushed to the open position, and the sequence valve inlet 123 and the sequence valve outlet 124 are connected. The sequence valve core 122, through the pilot control oil circuit 120b and the sequence valve reset spring 127, can quickly switch the passage between the sequence valve inlet 123 and the sequence valve outlet 124, and between the sequence valve outlet 124 and the sequence valve drain 125, thereby improving the sensitivity and response speed of the brake control valve 100.

[0037] The sequence valve return spring 127 is connected to the sequence valve core 122 via a connecting base 129. One end of the sequence valve return spring 127 is fixed to one side of the connecting base 129, and the sequence valve core 122 is connected to the other side of the connecting base 129 via a ball joint structure. The side of the connecting base 129 connected to the sequence valve return spring 127 can abut against the boss 103a on the inner wall of the assembly cavity 103 of the sequence valve return spring 127. When the sequence valve core 122 moves to the open position, the boss 103a on the inner wall of the assembly cavity 103 abuts against the connecting base 129 to restrict the sequence valve core 122 from continuing to move, thereby effectively and reliably moving the sequence valve core 122 to communicate with the sequence valve inlet 123 and the sequence valve outlet 124.

[0038] In one embodiment of this disclosure, such as Figure 4 As shown, the sequence unit 120 includes an adjustment part 128 mounted on the frame, and the output end of the adjustment part 128 is fixedly connected to the sequence valve return spring 127. Specifically, the brake control valve 100 is provided with a mounting seat for mounting the sequence valve return spring 127 and the adjustment part 128. The mounting seat has a mounting cavity 103 with openings at both ends and accommodating the sequence valve return spring 127. The mounting seat is connected to the control valve body 101, and the end cap 104 is detachably connected to the outer port of the mounting cavity 103. In this way, the pressure of the adjustment part 128 on the sequence valve return spring 127 can be adjusted at any time, thereby adjusting the opening setting pressure of the sequence valve core 122.

[0039] In a specific embodiment, the adjustment part 128 includes an adjustment rod 1281 and an adjustment sleeve 1282 that are connected in a mating manner. Other structural components may also be used to adjust the pressure of the sequence valve reset spring 127 in the closed position.

[0040] In one embodiment of this disclosure, the control valve body 101 is provided with a first oil passage 100a, a pressure reducing valve outlet passage 110a communicating with the pressure reducing valve outlet 114, and a sequence valve inlet passage 120a communicating with the sequence valve inlet 123. The first oil passage 100a is configured to connect the pressure reducing valve outlet passage 110a and the sequence valve inlet passage 120a. This configuration, with the first oil passage 100a, the sequence valve inlet passage 120a, and the pressure reducing valve outlet passage 110a located on the control valve body 101, effectively improves the compactness and overall integrity of the brake control valve 100 structure, as well as the sealing between oil circuits, preventing oil leakage and reducing the workload of connecting oil circuits.

[0041] Further design optimization involves arranging the pressure reducing valve outlet 110a and the sequence valve inlet 120a along a first direction, and the first oil passage 100a along a second direction, with the first and second directions perpendicular to each other. This arrangement effectively utilizes the space available for the brake control valve 100, allowing the pressure reducing unit 110 and the sequence unit 120 to be staggered in the front-rear direction, thus improving the compactness of the brake control valve 100 structure.

[0042] In one embodiment of this disclosure, the control valve body 101 is provided with a control valve drain port 102 and a drain passage 100d connecting the control valve drain port 102 and the sequence valve drain port 125. The control valve drain port 102 is located at the bottom of the control valve body 101, which can effectively return the working hydraulic oil through the drain passage 100d and the control valve drain port 102, thereby improving the functionality of the brake control valve 100.

[0043] In one embodiment of this disclosure, such as Figure 2 As shown, the pressure reducing valve core 112 is provided with a pressure reducing oil passage 110b. The inlet of the pressure reducing oil passage 110b is connected to the pressure reducing valve inlet 113, and the outlet of the pressure reducing oil passage 110b is connected to the pressure reducing valve outlet 114. The high-pressure hydraulic oil entering the brake control valve 100 enters the pressure reducing oil passage 110b through the pressure reducing valve inlet 113, and then the pressure reducing and stabilized hydraulic oil is conducted through the pressure reducing valve outlet 114 to flow into the sequence valve inlet 123.

[0044] Based on the above embodiments, such as Figure 2 , Figure 3 and Figure 4As shown, the brake control valve 100 also includes a shuttle valve unit 130 disposed on the control valve body 101. The shuttle valve unit 130 has a shuttle valve body 131 and a shuttle valve outlet 132 opened on the shuttle valve body 131. The shuttle valve outlet 132 is connected to the pressure reducing valve inlet 113. The shuttle valve unit 130 is another functional unit on the control valve body 101, meaning that the control valve body 101 forms the shuttle valve body 131. This effectively improves the functionality of the brake control valve 100.

[0045] The shuttle valve body 131 has a first shuttle valve inlet 133 and a second shuttle valve inlet 134. In operation, oil is supplied from the side with higher hydraulic oil level in the two shuttle valve inlets, while the side with lower hydraulic oil level is blocked by a steel ball.

[0046] In one embodiment of this disclosure, the control valve body 101 is further provided with a second oil passage 100b. The second oil passage 100b is equipped with damping and is configured to connect the shuttle valve outlet 132 and the pressure reducing valve inlet 113. The pressure reducing valve inlet passage 110c connects the pressure reducing valve inlet 113 and the outlet of the second oil passage 100b. The shuttle valve outlet 132 and the inlet of the second oil passage 100b are connected via the shuttle valve outlet passage 130a. With this configuration, the working oil is conducted to the pressure reducing unit 110 and the sequence unit 120 through the second oil passage 100b on the control valve body 101, effectively ensuring the sealing and stability of the oil circuit.

[0047] Combination Figure 7 The brake control valve 100 is integrated with a shuttle valve unit 130, a pressure reducing unit 110, and a sequence unit 120. It has a compact structure and high integrity. During the working process, all the working hydraulic oil is controlled through this integrated brake control valve 100, without the need for external parts. It can effectively control the brake to respond quickly, brake sensitively, and work smoothly and reliably.

[0048] The various embodiments of this disclosure have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of this disclosure is defined by the appended claims.

Claims

1. A brake control valve, characterized in that, It includes a control valve body (101) and a frame that houses the control valve body (101), wherein the control valve body (101) is provided with a pressure reducing unit (110) and a sequence unit (120) located above the pressure reducing unit (110). The pressure reducing unit (110) includes a pressure reducing valve body (111) and a pressure reducing valve core (112). The pressure reducing valve body (111) is configured to have a pressure reducing valve cavity, and the pressure reducing valve core (112) is configured to be movably connected in the pressure reducing valve cavity. The pressure reducing valve body (111) is provided with a pressure reducing valve inlet (113) and a pressure reducing valve outlet (114) located at both ends of the pressure reducing valve cavity. The sequence unit (120) includes a sequence valve body (121) and a sequence valve core (122). The sequence valve body (121) is configured to have a sequence valve cavity, and the sequence valve core (122) is configured to be movably connected within the sequence valve cavity. The sequence valve body (121) has a sequence valve inlet (123) communicating with the pressure reducing valve outlet (114), a sequence valve outlet (124) communicating with the brake control end, and a sequence valve drain (125). The sequence valve core (122) has a first conductive part (122a) communicating with the sequence valve inlet (123) and the sequence valve outlet (124), and a first conductive part (122a) communicating with the sequence valve outlet (124) and the sequence valve drain (125). 25) The second conductive part (122b); the sequence valve core (122) has an open position and a closed position. When in the open position, the sequence valve core (122) is configured to connect the sequence valve inlet (123) and the sequence valve outlet (124) through the first conductive part (122a), blocking the passage between the sequence valve outlet (124) and the sequence valve drain (125); when in the closed position, the sequence valve core (122) is configured to connect the sequence valve outlet (124) and the sequence valve drain (125) through the second conductive part (122b), blocking the sequence valve inlet (123) and the sequence valve outlet (124).

2. The brake control valve according to claim 1, characterized in that, Both the first conductive part (122a) and the second conductive part (122b) are annular grooves formed on the outer peripheral surface of the sequential valve core (122).

3. The brake control valve according to claim 1, characterized in that, The sequence unit (120) includes a sequence valve seat (126), a pilot control oil circuit (120b) opened in the sequence valve seat (126), and a sequence valve return spring (127) connected to one end of the sequence valve core (122). The other end of the sequence valve core (122) is located in a pilot chamber (120c) connected to the pilot control oil circuit (120b). The control oil pressure in the pilot chamber (120c) is less than the set pressure of the sequence valve core (122). The sequence valve return spring (127) pushes the sequence valve core (122) to the closed position. The sequence valve outlet (124) and the sequence valve drain port (125) are connected. The control oil pressure in the pilot chamber (120c) is greater than the set pressure of the sequence valve core (122). The sequence valve core (122) is pushed to the open position. The sequence valve inlet (123) and the sequence valve outlet (124) are connected.

4. The brake control valve according to claim 3, characterized in that, The sequence unit (120) includes an adjustment part (128) assembled on the frame, and the output end of the adjustment part (128) is fixedly connected to the sequence valve reset spring (127).

5. The brake control valve according to claim 1, characterized in that, The control valve body (101) is provided with a first oil passage (100a), a pressure reducing valve outlet passage (110a) communicating with the pressure reducing valve outlet (114), and a sequence valve inlet passage (120a) communicating with the sequence valve inlet (123). The first oil passage (100a) is configured to connect the pressure reducing valve outlet passage (110a) and the sequence valve inlet passage (120a).

6. The brake control valve according to claim 5, characterized in that, The pressure reducing valve outlet passage (110a) and the sequence valve inlet passage (120a) are configured to be arranged along a first direction, and the first passage (100a) is configured to be arranged along a second direction, the first direction being perpendicular to the second direction.

7. The brake control valve according to claim 1, characterized in that, The control valve body (101) is provided with a control valve drain port (102) and a drain passage (100d) connecting the control valve drain port (102) and the sequence valve drain port (125).

8. The brake control valve according to claim 1, characterized in that, The pressure reducing valve core (112) is provided with a pressure reducing oil passage (110b). The inlet of the pressure reducing oil passage (110b) is connected to the oil inlet (113) of the pressure reducing valve, and the outlet of the pressure reducing oil passage (110b) is connected to the oil outlet (114) of the pressure reducing valve.

9. The brake control valve according to any one of claims 1-8, characterized in that, The system includes a shuttle valve unit (130) disposed on the control valve body (101), the shuttle valve unit (130) having a shuttle valve body (131) and a shuttle valve outlet (132) opened on the shuttle valve body (131), the shuttle valve outlet (132) being connected to the pressure reducing valve inlet (113).

10. The brake control valve according to claim 9, characterized in that, The control valve body (101) is also provided with a second oil passage (100b), which is provided with damping. The second oil passage (100b) is configured to connect the oil outlet (132) of the shuttle valve and the oil inlet (113) of the pressure reducing valve.

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