Brake valve group, hydraulic system and operating machinery

Abstract

The present invention relates to the technical field of hydraulic components and hydraulic systems, and provides a brake valve group, a hydraulic system and an operating machine. The brake valve group includes a valve block body, an energy storage component, a pressure oil port, a brake working oil port and an auxiliary working oil port. The valve block body is provided with a pressure oil port, a brake working oil port and an auxiliary working oil port. The pressure oil port is connected to the energy storage component to charge and store energy in the energy storage component. The pressure oil port is respectively connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port. The energy storage component is respectively connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port, and maintains the working stability of the brake valve group. The brake valve group has rich functions. By using the brake valve group, there is no need to add other components for enriching the functions of the hydraulic system, which greatly reduces the cost of the hydraulic system and improves the degree of integration of the hydraulic system.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic components and hydraulic systems, and in particular to a brake valve group, a hydraulic system and an operating machine. Background Art

[0002] The brake system is an indispensable component of operating machinery. Most brake systems are hydraulic brake systems. In existing hydraulic brake systems, the brake valve group is mostly used only for driving brake oil supply. Accumulator filling requires a separate filling valve. In addition, for brake systems that require additional functions such as parking release, emergency braking and differential lock, additional related hydraulic components and pipelines are required to achieve the corresponding functions. The cost is high, the space occupied is large, and it is not conducive to the integration and structural layout of the hydraulic system. Summary of the invention

[0003] The invention provides a brake valve group, a hydraulic system and an operating machine, which are used to solve the problems of the existing brake valve group having a single function, a high cost of the hydraulic system, a large occupied space and a low degree of integration.

[0004] According to a first aspect of the present invention, a brake valve group is provided, comprising: a valve block body, an energy storage assembly, a pressure oil port, a brake working oil port and an auxiliary working oil port.

[0005] The valve block body is provided with the pressure oil port, the brake working oil port and the auxiliary working oil port. The pressure oil port is connected to the energy storage component to charge and store energy for the energy storage component. The pressure oil port is respectively connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port. The energy storage component is respectively connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port and maintain the working stability of the brake valve group.

[0006] According to a brake valve group provided by the present invention, the brake working oil port includes a service brake working oil port and an emergency brake working oil port.

[0007] The service brake working oil port is connected to the energy storage component and the pressure oil port. The emergency brake working oil port is connected to the energy storage component and the pressure oil port through an emergency brake switching valve. The emergency brake switching valve includes an emergency brake connection position and an emergency brake cut-off position.

[0008] When the emergency brake is in the connected position, the emergency brake working oil port is connected with the energy storage component and the pressure oil port; when the emergency brake is in the closed position, the emergency brake working oil port is closed with the energy storage component and the pressure oil port.

[0009] According to a brake valve group provided by the present invention, the auxiliary working oil ports include a differential lock working oil port and a parking release working oil port.

[0010] The differential lock working oil port is connected to the energy storage component and the pressure oil port through a differential lock working switching valve. The differential lock working switching valve includes a differential lock working connection position and a differential lock working cut-off position.

[0011] When the differential lock is in the working connection position, the differential lock working oil port is connected to the energy storage component and the pressure oil port. When the differential lock is in the working cut-off position, the differential lock working oil port is cut off from the energy storage component and the pressure oil port.

[0012] The parking release working oil port is connected to the energy storage component and the pressure oil port through a parking release working switching valve. The parking release working switching valve includes a parking release working connection position and a parking release working cut-off position.

[0013] In the state of the parking release work connection position, the parking release work oil port is connected with the energy storage component and the pressure oil port. In the state of the parking release work cut-off position, the parking release work oil port is cut off from the energy storage component and the pressure oil port.

[0014] According to a brake valve group provided by the present invention, the energy storage assembly includes a first accumulator, a second accumulator and a third accumulator. The service brake working oil port includes a front axle service brake working oil port, a middle axle service brake working oil port, a rear axle service brake working oil port and a spare service brake working oil port. The first accumulator is connected to the front axle service brake working oil port and the spare service brake working oil port. The second accumulator is connected to the middle axle service brake working oil port. The third accumulator is connected to the rear axle service brake working oil port.

[0015] A first one-way valve for preventing oil from flowing back is provided between the first accumulator and the pressure oil port, between the second accumulator and the pressure oil port, and between the third accumulator and the pressure oil port.

[0016] According to a brake valve group provided by the present invention, the emergency brake working oil port includes a front axle emergency brake working oil port, a middle axle emergency brake working oil port and a rear axle emergency brake working oil port. The front axle emergency brake working oil port, the middle axle emergency brake working oil port and the rear axle emergency brake working oil port are all connected to the pressure oil port and the first accumulator through the emergency brake switching valve.

[0017] According to a brake valve group provided by the present invention, pressure reducing valves are installed between the emergency brake switching valve and the emergency brake working oil port, between the differential lock working switching valve and the differential lock working oil port, and between the parking release working switching valve and the parking release working oil port.

[0018] According to a brake valve group provided by the present invention, a first oil return port is provided on the valve block body. An oil inlet main oil circuit and an oil return oil circuit are provided inside the valve block body. The pressure oil port is connected to the energy storage component, the brake working oil port and the auxiliary working oil port through the oil inlet main oil circuit. The first oil return port is connected to the pressure oil port through the oil return oil circuit.

[0019] A pilot-operated overflow valve and an unloading valve are arranged between the main oil inlet circuit and the oil return circuit.

[0020] Wherein, the control oil port of the pilot relief valve is communicated with the pressure oil port. The oil inlet of the pilot relief valve is communicated with the pressure oil port. The oil outlet of the pilot relief valve is communicated with the first oil return port. The pilot relief valve has an opening pressure.

[0021] The unloading valve includes an unloading position and a working position. The first control oil port of the unloading valve is communicated with the pressure oil port. The second control oil port of the unloading valve is communicated with the oil inlet of the pilot relief valve. A spring is arranged on one side of the unloading valve core close to the second control oil port.

[0022] When the pressure of the pressure oil port is greater than or equal to the opening pressure, the pilot relief valve opens, the unloading valve switches to the unloading position, and the pressure oil port is connected to the first oil return port. When the pressure of the pressure oil port is less than the opening pressure, the pilot relief valve closes, the unloading valve switches to the working position, and the pressure oil port and the first oil return port are cut off from each other.

[0023] According to a brake valve group provided by the present invention, the valve block body is provided with a plurality of first pressure detection ports for detecting the pressure of the pressure oil port, the brake working oil port, the auxiliary working oil port and the energy storage component. The first pressure detection port is provided with a second one-way valve for preventing oil leakage.

[0024] The valve block body is also provided with a second pressure detection port for detecting the pressure of the energy storage assembly. A pressure sensor is installed on the second pressure detection port.

[0025] According to a second aspect of the present invention, a hydraulic system is provided, comprising a hydraulic pump and the brake valve group as described above, wherein the hydraulic pump is connected to the pressure oil port.

[0026] According to a third aspect of the present invention, there is provided a working machine, comprising the brake valve group or the hydraulic system as described above.

[0027] In the brake valve group provided by the present invention, the pressure oil port, the brake working oil port and the auxiliary working oil port are provided on the valve block body. The pressure oil port is connected to the energy storage component to charge and store energy for the energy storage component. The pressure oil port is respectively connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port. The energy storage component is respectively connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port and maintain the working stability of the brake valve group.

[0028] During operation, the pressure oil port is connected to a pressure oil source. The pressure oil port is connected to the brake working oil port to supply oil to the brake actuator. The pressure oil port is connected to the energy storage component to store oil in the energy storage component. The pressure oil port is also connected to the auxiliary working oil port to supply oil to other auxiliary actuators, such as differential locks. At the same time, the energy storage component is also connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port, and to keep the pressure of the brake valve group stable.

[0029] According to the above description, the brake valve group has rich functions, and by using the brake valve group, there is no need to add a special filling valve for filling the accumulator or other components for enriching the functions of the hydraulic system, which greatly reduces the cost of the hydraulic system and improves the degree of integration of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a structural schematic diagram of the brake valve group provided by the present invention;

[0032] Reference numerals:

[0033] 100, valve block body; 201, first accumulator; 202, second accumulator; 203, third accumulator; 300, pressure oil port; 401, differential lock working oil port; 402, differential lock working switching valve; 403, differential lock working connection position; 404, differential lock working stop position; 405, parking release working oil port; 406, parking release working switching valve; 407, parking release working connection position; 408, parking release working stop position; 501, front axle service brake working oil port; 502, middle axle service brake working oil port; 503, rear axle service brake working oil port; 504, spare service brake working oil port; 6 01, front axle emergency brake working oil port; 602, middle axle emergency brake working oil port; 603, rear axle emergency brake working oil port; 700, emergency brake switching valve; 701, emergency brake connecting position; 702, emergency brake cut-off position; 801, first one-way valve; 802, pressure reducing valve; 803, first pressure detection port; 804, second pressure detection port; 805, second one-way valve; 806, pressure sensor; 901, first oil return port; 902, main oil inlet circuit; 903, oil return circuit; 904, pilot relief valve; 905, unloading valve; 906, unloading position; 907, working position; 908, second oil return port. DETAILED DESCRIPTION

[0034] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0037] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, in the absence of mutual contradiction, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples to make the purpose, technical solutions and advantages of the embodiment of the present invention clearer. The technical solutions in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0039] Combine the following Figure 1 A brake valve group, a hydraulic system and a working machine provided by an embodiment of the present invention are described. It should be understood that the following description is only an illustrative embodiment of the present invention and does not constitute any particular limitation to the present invention.

[0040] The embodiment of the first aspect of the present invention provides a brake valve group, such as Figure 1 As shown, the brake valve group includes: a valve block body 100, an energy storage component, a pressure oil port 300, a brake working oil port and an auxiliary working oil port.

[0041] The valve block body 100 is provided with a pressure oil port 300, a brake working oil port and an auxiliary working oil port. The pressure oil port 300 is connected to the energy storage component to charge and store energy for the energy storage component. The pressure oil port 300 is respectively connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port. The energy storage component is respectively connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port and maintain the working stability of the brake valve group.

[0042] During operation, the pressure oil port 300 is connected to a pressure oil source. The pressure oil port 300 is connected to the brake working oil port to supply oil to the brake actuator. The pressure oil port 300 is connected to the energy storage component to store oil in the energy storage component. The pressure oil port 300 is also connected to the auxiliary working oil port to supply oil to other auxiliary actuators, for example, the auxiliary actuator includes a differential lock, etc. At the same time, the energy storage component is also connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port, and to keep the pressure of the brake valve group stable.

[0043] According to the above description, the brake valve group has rich functions, and by using the brake valve group, there is no need to add a special filling valve for filling the accumulator or other components for enriching the functions of the hydraulic system, which greatly reduces the cost of the hydraulic system and improves the degree of integration of the hydraulic system.

[0044] In one embodiment of the present invention, the brake working oil port includes a service brake working oil port and an emergency brake working oil port.

[0045] The service brake working oil port is connected to the energy storage component and the pressure oil port 300. The emergency brake working oil port is connected to the energy storage component and the pressure oil port 300 through the emergency brake switching valve 700. The emergency brake switching valve 700 includes an emergency brake connection position 701 and an emergency brake cut-off position 702.

[0046] When the emergency brake communication position 701 is in the state, the emergency brake working oil port is in communication with the energy storage component and the pressure oil port 300. When the emergency brake cut-off position 702 is in the state, the emergency brake working oil port is cut off from the energy storage component and the pressure oil port 300.

[0047] For example, Figure 1As shown, a second oil return port 908 is provided on the valve block body 100, one side of the emergency brake switching valve 700 is connected to the second oil return port 908, the pressure oil port 300 and the energy storage assembly, and the other side is connected to the emergency brake working oil port. During normal driving of the operating machine, the service brake is frequently used. The pressure oil port 300 and the service brake working oil port are always connected so that the driver can perform service braking at any time. In this embodiment, the emergency brake switching valve 700 is a two-position three-way reversing valve. The right position of the two-position three-way reversing valve is the emergency brake connection position 701, and the left position is the emergency brake cut-off position 702. When the operating machine is in a normal driving state, the two-position three-way reversing valve is in the left position, the pressure oil port 300 and the energy storage assembly are cut off from the emergency brake working oil port, and it is only necessary to keep the service brake working oil port normally supplied with oil. When the service brake fails or an emergency situation requires emergency braking, the driver quickly switches the two-position three-way reversing valve to the right position so that the pressure oil port 300 and the energy storage component are connected to the emergency brake working oil port, so that the hydraulic oil can be supplied to the emergency brake working oil port through the emergency brake reversing valve.

[0048] In one embodiment of the present invention, the auxiliary working oil ports include a differential lock working oil port 401 and a parking release working oil port 405 .

[0049] The differential lock working oil port 401 is connected to the energy storage component and the pressure oil port 300 through the differential lock working switching valve 402. The differential lock working switching valve 402 includes a differential lock working connecting position 403 and a differential lock working closing position 404.

[0050] In the differential lock working connection position 403, the differential lock working oil port 401 is connected to the energy storage component and the pressure oil port 300. In the differential lock working cut-off position 404, the differential lock working oil port 401 is cut off from the energy storage component and the pressure oil port 300.

[0051] The parking release operation oil port 405 is connected to the energy storage assembly and the pressure oil port 300 through the parking release operation switching valve 406. The parking release operation switching valve 406 includes a parking release operation communication position 407 and a parking release operation cut-off position 408.

[0052] In the state of the parking release operation connecting position 407, the parking release operation oil port 405 is connected to the energy storage component and the pressure oil port 300. In the state of the parking release operation closing position 408, the parking release operation oil port 405 is closed to the energy storage component and the pressure oil port 300.

[0053] It should be noted here that the auxiliary working oil ports include but are not limited to the differential lock working oil port 401 and the parking release working oil port 405 .

[0054] exist Figure 1In the embodiment shown, the auxiliary working oil port includes a differential lock working oil port 401 and a parking release working oil port 405. The differential lock working oil port 401 is connected to the pressure oil port 300 and the energy storage component through the differential lock working switching valve 402. One side of the differential lock working switching valve 402 is connected to the differential lock working oil port 401, and the other side is respectively connected to the second oil return port 908, the pressure oil port 300 and the energy storage component. In this embodiment, the differential lock working switching valve 402 is a two-position three-way reversing valve. The right position of the two-position three-way reversing valve is the differential lock working connection position 403, and the left position is the differential lock working cut-off position 404. When the differential lock does not need to be activated, the driver switches the two-position three-way reversing valve to the left position so that the pressure oil port 300 and the energy storage component are cut off from the differential lock working oil port 401. When the differential lock needs to be activated, the driver switches the two-position three-way reversing valve to the right position to connect the pressure oil port 300 and the energy storage component with the differential lock working oil port 401. The pressure oil port 300 provides the main oil source for the differential lock, and the energy storage component is used to stabilize the output pressure of the differential lock working oil port 401.

[0055] Similarly, the parking release working oil port 405 is connected to the energy storage component and the pressure oil port 300 through the parking release working switching valve 406. One side of the parking release working switching valve 406 is connected to the parking release working oil port 405, and the other side is respectively connected to the second oil return port 908, the pressure oil port 300 and the energy storage component. In this embodiment, the parking release working switching valve 406 is a two-position three-way reversing valve. The right position of the two-position three-way reversing valve is the parking release working connection position 407, and the left position is the parking release working cut-off position 408. When the parking release action needs to be performed, the driver switches the two-position three-way reversing valve to the right position so that the pressure oil port 300 and the energy storage component are connected to the parking release working oil port 405, and the pressure oil port 300 provides the main oil source for the parking release working oil port 405, and the energy storage component is used to stabilize the output pressure of the parking release working oil port 405. When the parking release action is not required, the driver switches the two-position three-way reversing valve to the left position, so that the pressure oil port 300 and the energy storage component are cut off from the parking release working oil port 405 .

[0056] Further, in one embodiment of the present invention, the energy storage assembly includes a first accumulator 201, a second accumulator 202, and a third accumulator 203. The service brake working oil port includes a front axle service brake working oil port 501, a middle axle service brake working oil port 502, a rear axle service brake working oil port 503, and a spare service brake working oil port 504. The first accumulator 201 is connected to the front axle service brake working oil port 501 and the spare service brake working oil port 504. The second accumulator 202 is connected to the middle axle service brake working oil port 502. The third accumulator 203 is connected to the rear axle service brake working oil port 503.

[0057] A first check valve 801 for preventing oil from flowing back is provided between the first accumulator 201 and the pressure oil port 300 , between the second accumulator 202 and the pressure oil port 300 , and between the third accumulator 203 and the pressure oil port 300 .

[0058] In one embodiment of the present invention, the emergency brake working oil port includes a front axle emergency brake working oil port 601, a middle axle emergency brake working oil port 602, and a rear axle emergency brake working oil port 603. The front axle emergency brake working oil port 601, the middle axle emergency brake working oil port 602, and the rear axle emergency brake working oil port 603 are all connected to the pressure oil port 300 and the first accumulator 201 through the emergency brake switching valve 700.

[0059] like Figure 1 As shown, the pressure oil port 300 is connected to the first accumulator 201 and is used to charge the first accumulator 201. The first accumulator 201 is respectively connected to the front axle service brake working oil port 501, the spare service brake working oil port 504, the front axle emergency brake working oil port 601, the middle axle emergency brake working oil port 602 and the rear axle emergency brake working oil port 603 to realize the front axle service brake working oil port 501, the spare service brake working oil port 504, the front axle emergency brake working oil port 601, the middle axle emergency brake working oil port 602 and the rear axle emergency brake working oil port 603 to stabilize the pressure of the oil supply.

[0060] The spare service brake oil port 504 is used for emergency use. For example, when the front axle service brake oil port 501, the middle axle service brake oil port 502, or the rear axle service brake oil port 503 fails, the spare service brake oil port 504 can be used to replace the failed oil port in an emergency, thereby ensuring driving safety.

[0061] The second accumulator 202 is connected to the middle axle service brake working oil port 502 to supply oil to the middle axle service brake working oil port 502. The third accumulator 203 is connected to the rear axle service brake working oil port 503 to supply oil to the rear axle service brake working oil port 503.

[0062] In one embodiment of the present invention, a pressure reducing valve 802 is installed between the emergency brake switching valve 700 and the emergency brake working oil port, between the differential lock working switching valve 402 and the differential lock working oil port 401, and between the parking release working switching valve 406 and the parking release working oil port 405.

[0063] This structural setting can keep the output pressure of the emergency brake working oil port, the differential lock working oil port 401 and the parking release working oil port 405 within the normal range, thereby protecting the emergency brake actuator, the differential lock and the parking brake actuator.

[0064] In one embodiment of the present invention, a first oil return port 901 is provided on the valve block body 100. An oil inlet main oil circuit 902 and an oil return oil circuit 903 are provided inside the valve block body 100. The pressure oil port 300 is connected to the energy storage component, the brake working oil port and the auxiliary working oil port through the oil inlet main oil circuit 902. The first oil return port 901 is connected to the pressure oil port 300 through the oil return oil circuit 903.

[0065] A pilot-operated overflow valve 904 and an unloading valve 905 are provided between the main oil inlet circuit 902 and the oil return circuit 903 .

[0066] The control oil port of the pilot relief valve 904 is connected to the pressure oil port 300. The oil inlet of the pilot relief valve 904 is connected to the pressure oil port 300. The oil outlet of the pilot relief valve 904 is connected to the first oil return port 901. The pilot relief valve 904 has an opening pressure.

[0067] The unloading valve 905 includes an unloading position 906 and a working position 907. The first control oil port of the unloading valve 905 is connected to the pressure oil port 300. The second control oil port of the unloading valve 905 is connected to the oil inlet of the pilot relief valve 904. A spring is provided on one side of the valve core of the unloading valve 905 close to the second control oil port.

[0068] When the pressure of the pressure oil port 300 is greater than or equal to the opening pressure, the pilot relief valve 904 opens, the unloading valve 905 switches to the unloading position 906, and the pressure oil port 300 is connected to the first oil return port 901. When the pressure of the pressure oil port 300 is less than the opening pressure, the pilot relief valve 904 closes, the unloading valve 905 switches to the working position 907, and the pressure oil port 300 and the first oil return port 901 are cut off from each other.

[0069] For example, Figure 1 As shown, the valve block body 100 has an oil inlet main oil circuit 902 and an oil return oil circuit 903. One end of the oil inlet main oil circuit 902 is connected to the pressure oil port 300, and the other end is respectively connected to the energy storage component, the brake working oil port and the auxiliary working oil port to supply oil to the energy storage component, the brake working oil port and the auxiliary working oil port. One end of the oil return oil circuit 903 is connected to the first oil return port 901, and the other end is connected to the pressure oil port 300.

[0070] A pilot relief valve 904 and an unloading valve 905 are provided between the main oil inlet circuit and the oil return circuit 903. An opening pressure is set in the pilot relief valve 904. The unloading valve 905 includes a two-position two-way reversing valve. The left position of the two-position two-way reversing valve is the unloading position 906, and the right position is the working position 907. The left control oil port of the two-position two-way reversing valve is connected to the pressure oil port 300, and the right control oil port is connected to the oil inlet of the pilot relief valve 904. A spring is provided on the right side of the valve core of the unloading valve 905.

[0071] When the pressure of the pressure oil port 300 is less than the opening pressure set by the relief valve, the pressure of the left control oil port and the right control oil port of the two-position two-way reversing valve are equal. Under the action of the spring force, the two-position two-way reversing valve switches to the right position, that is, the working position 907. At this time, the hydraulic pump connected to the pressure oil port 300 normally supplies oil to the energy storage component, the brake working oil port and the auxiliary working oil port.

[0072] When the pressure of the pressure oil port 300 is greater than or equal to the opening pressure set by the relief valve, the right control oil port of the two-position two-way reversing valve is connected to the first oil return port 901 through the relief valve, and the pressure is reduced. At this time, the valve core of the two-position two-way reversing valve moves to the right, and the two-position two-way reversing valve switches to the left position, that is, the unloading position 906. The hydraulic pump connected to the pressure oil port 300 is unloaded to the first oil return port 901 through the unloading valve 905.

[0073] In one embodiment of the present invention, the valve block body 100 is provided with a plurality of first pressure detection ports 803 for detecting the pressure of the pressure oil port 300, the brake working oil port, the auxiliary working oil port and the energy storage assembly. The first pressure detection port 803 is provided with a second one-way valve 805 for preventing oil leakage.

[0074] The valve block body 100 is also provided with a second pressure detection port 804 for detecting the pressure of the energy storage assembly. A pressure sensor 806 is installed on the second pressure detection port 804 .

[0075] During use, when it is necessary to detect the pressure of the pressure oil port 300, the brake working oil port, the auxiliary working oil port and the energy storage component, a pressure detection device such as a pressure gauge is installed in the corresponding first pressure detection port 803. It should be understood here that the first pressure detection port 803 can perform pressure detection during the test phase of the brake valve group or when the operating machinery is shut down. A pressure sensor 806 is installed on the second pressure detection port 804, and the pressure sensor 806 can be connected to the control device and display device of the operating machinery. The pressure sensor 806 transmits the pressure detection result to the control device, and the control device can control the output pressure of the pressure oil port 300 based on the detection result, thereby effectively protecting the energy storage component. At the same time, the detection result of the pressure sensor 806 can be displayed on the display device for the driver to view.

[0076] An embodiment of the second aspect of the present invention provides a hydraulic system, including a hydraulic pump and the brake valve group as described above, wherein the hydraulic pump is connected to the pressure oil port 300 .

[0077] In one embodiment of the present invention, the hydraulic system further comprises a brake actuator, a parking actuator and a differential lock. The brake actuator is connected to the brake working oil port, the parking actuator is connected to the parking release working oil port 405, and the differential lock is connected to the auxiliary working oil port.

[0078] Furthermore, since the hydraulic system includes the brake valve group as described above, it also has the working advantages as described above.

[0079] An embodiment of the third aspect of the present invention provides a working machine, comprising the brake valve group or hydraulic system as described above.

[0080] For example, in one embodiment of the present invention, the working machine includes a dump truck.

[0081] It should be understood that the above embodiment is only an illustrative embodiment of the present invention and does not constitute any limitation to the present invention. That is, the above working machinery includes but is not limited to a dump truck.

[0082] Since the working machine includes the brake valve group or hydraulic system as described above, it also has the advantages as described above.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A brake valve assembly, characterized in that: include: Valve block body, energy storage assembly, pressure oil port, brake working oil port and auxiliary working oil port, The valve block body is provided with the pressure oil port, the brake working oil port and the auxiliary working oil port, the pressure oil port is connected to the energy storage component to charge and store oil for the energy storage component, the pressure oil port is respectively connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port, the energy storage component is respectively connected to the brake working oil port and the auxiliary working oil port to supply oil to the brake working oil port and the auxiliary working oil port, and maintains the working stability of the brake valve group; The auxiliary working oil ports include a differential lock working oil port and a parking release working oil port; The differential lock working oil port is connected to the energy storage component and the pressure oil port through a differential lock working switching valve, and the differential lock working switching valve includes a differential lock working connection position and a differential lock working cut-off position. In the state of the differential lock working connection position, the differential lock working oil port is connected to the energy storage component and the pressure oil port; in the state of the differential lock working cut-off position, the differential lock working oil port is cut off from the energy storage component and the pressure oil port; The parking release working oil port is connected to the energy storage component and the pressure oil port through a parking release working switching valve. The parking release working switching valve includes a parking release working connection position and a parking release working stop position. In the state of the parking release working connection position, the parking release working oil port is connected to the energy storage component and the pressure oil port; in the state of the parking release working stop position, the parking release working oil port is cut off from the energy storage component and the pressure oil port.

2. The brake valve assembly according to claim 1, characterized in that: The brake working oil port includes a service brake working oil port and an emergency brake working oil port. The service brake working oil port is connected to the energy storage component and the pressure oil port, and the emergency brake working oil port is connected to the energy storage component and the pressure oil port through an emergency brake switching valve, and the emergency brake switching valve includes an emergency brake connection position and an emergency brake cut-off position. When the emergency brake is in the connected position, the emergency brake working oil port is connected with the energy storage component and the pressure oil port; when the emergency brake is in the closed position, the emergency brake working oil port is closed with the energy storage component and the pressure oil port.

3. The brake valve assembly according to claim 2, characterized in that: The energy storage assembly includes a first accumulator, a second accumulator and a third accumulator, the service brake working oil port includes a front axle service brake working oil port, a middle axle service brake working oil port, a rear axle service brake working oil port and a spare service brake working oil port, the first accumulator is connected to the front axle service brake working oil port and the spare service brake working oil port, the second accumulator is connected to the middle axle service brake working oil port, and the third accumulator is connected to the rear axle service brake working oil port, A first one-way valve for preventing oil from flowing back is provided between the first accumulator and the pressure oil port, between the second accumulator and the pressure oil port, and between the third accumulator and the pressure oil port.

4. The brake valve assembly according to claim 3, characterized in that: The emergency brake working oil port includes a front axle emergency brake working oil port, a middle axle emergency brake working oil port and a rear axle emergency brake working oil port. The front axle emergency brake working oil port, the middle axle emergency brake working oil port and the rear axle emergency brake working oil port are all connected to the pressure oil port and the first accumulator through the emergency brake switching valve.

5. The brake valve assembly according to claim 3, characterized in that: Pressure reducing valves are installed between the emergency brake switching valve and the emergency brake operating oil port, between the differential lock operating switching valve and the differential lock operating oil port, and between the parking release operating switching valve and the parking release operating oil port.

6. The brake valve assembly according to claim 1, characterized in that: The valve block body is provided with a first oil return port, the valve block body is provided with an oil inlet main oil circuit and an oil return oil circuit, the pressure oil port is connected to the energy storage component, the brake working oil port and the auxiliary working oil port through the oil inlet main oil circuit, and the first oil return port is connected to the pressure oil port through the oil return oil circuit. A pilot relief valve and an unloading valve are provided between the main oil inlet circuit and the oil return circuit. The control oil port of the pilot relief valve is connected to the pressure oil port, the oil inlet of the pilot relief valve is connected to the pressure oil port, the oil outlet of the pilot relief valve is connected to the first oil return port, and the pilot relief valve has an opening pressure. The unloading valve comprises an unloading position and a working position, a first control oil port of the unloading valve is communicated with the pressure oil port, a second control oil port of the unloading valve is communicated with the oil inlet of the pilot relief valve, and a spring is arranged on one side of the valve core of the unloading valve close to the second control oil port. When the pressure of the pressure oil port is greater than or equal to the opening pressure, the pilot relief valve opens, the unloading valve switches to the unloading position, and the pressure oil port is connected to the first oil return port; when the pressure of the pressure oil port is less than the opening pressure, the pilot relief valve closes, the unloading valve switches to the working position, and the pressure oil port and the first oil return port are cut off from each other.

7. The brake valve assembly according to any one of claims 1 to 6, characterized in that: The valve block body is provided with a plurality of first pressure detection ports for detecting the pressure of the pressure oil port, the brake working oil port, the auxiliary working oil port and the energy storage component, and the first pressure detection port is provided with a second one-way valve for preventing oil leakage. The valve block body is also provided with a second pressure detection port for detecting the pressure of the energy storage assembly, and a pressure sensor is installed on the second pressure detection port.

8. A hydraulic system, characterized in that: The invention comprises a hydraulic pump and a brake valve group as claimed in any one of claims 1 to 7, wherein the hydraulic pump is connected to the pressure oil port.

9. A working machine, characterized in that: The method comprises the brake valve assembly according to any one of claims 1 to 7 or the hydraulic system according to claim 8.

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