Hydraulic control system and working machine

Abstract

The application relates to the technical field of hydraulic systems, and discloses a hydraulic control system and a working machine. In the hydraulic control system, an oil source is connected with an accumulator group through a liquid charging one-way valve. The accumulator group is connected with a brake unit. A pressure feedback control oil port is arranged on a liquid charging control valve group. The liquid charging control valve group can control the communication state of the liquid charging one-way valve and the oil source based on the pressure value of the pressure feedback control oil port. One end of a throttling element is connected with the accumulator group. The other end of the throttling element is connected with the liquid charging one-way valve and the pressure feedback control oil port. Through the structural arrangement, the pressure decay rate of the accumulator group fed back to the pressure feedback control oil port is reduced under the throttling action of the throttling element. Therefore, the starting frequency of the liquid charging valve can be reduced, energy waste can be reduced, the liquid charging valve can be effectively protected, and the service life of the liquid charging valve can be prolonged.

Description

Technical Field

[0001] This invention relates to the field of hydraulic system technology, and in particular to a hydraulic control system and a working machine. Background Technology

[0002] The braking system is an essential component of operating machinery, used to forcibly reduce the speed of the machinery or keep it in a parked position. A braking system typically includes a filling valve, an accumulator, a brake, and an oil pump. The filling valve is located between the oil pump and the accumulator and is used to fill the accumulator with fluid. The accumulator is connected to the brake to provide the brake fluid.

[0003] Currently, there exists a filling valve comprising a check valve and a pressure feedback control element. The check valve is positioned between the accumulator and the oil pump. The pressure feedback control element includes a pressure feedback control port, which is directly connected to the accumulator's oil port. Therefore, the pressure feedback control element can control the connection state between the check valve and the oil pump based on the pressure feedback value at the accumulator's oil port. In other words, the pressure feedback control element can control the filling state of the filling valve based on the pressure feedback value at the accumulator's oil port, causing the filling valve to start filling or close to stop filling.

[0004] When a check valve wears down, its pressure-holding performance deteriorates, causing oil to leak from the outlet side to the inlet side. Consequently, oil from the accumulator continuously replenishes and leaks to the inlet side of the check valve. This leads to a faster pressure decay rate at the pressure feedback control port, causing the filling valve to open frequently for filling. This results in energy waste and shortens the lifespan of the filling valve. Summary of the Invention

[0005] This invention provides a hydraulic control system and a working machine to solve the problem of frequent filling caused by leakage of the one-way valve in the filling valve of the existing braking system.

[0006] According to a first aspect of the present invention, a hydraulic control system is provided, comprising: an accumulator group, a braking unit, a filling valve, an oil source, and a throttling element.

[0007] The filling valve includes a filling check valve and a filling control valve assembly. The oil source is connected to the accumulator assembly via the filling check valve. The accumulator assembly is connected to the braking unit. The filling control valve assembly is provided with a pressure feedback control port. The filling control valve assembly can control the connection state between the filling check valve and the oil source based on the pressure value of the pressure feedback control port. One end of the throttling element is connected to the accumulator assembly, and the other end of the throttling element is connected to the filling check valve and the pressure feedback control port.

[0008] According to a hydraulic control system provided by the present invention, the filling control valve group includes a pressure feedback control valve and a filling switching valve. The oil source includes an oil pump and an oil tank.

[0009] The pressure feedback control valve includes a pressure output position and a pressure cutoff position. It also includes a first working port, a second working port, a third working port, a pressure feedback control port, and a first control spring. The pressure feedback control port and the first control spring are located at opposite ends of the pressure feedback control valve to jointly adjust its operating position.

[0010] The liquid filling switching valve includes a liquid filling position and a liquid filling stop position. The liquid filling switching valve also includes a fourth working port, a fifth working port, a first control port, a second control port, and a second control spring. The first control port and the second control spring are located at one end of the liquid filling switching valve, and the second control port is located at the other end of the liquid filling switching valve, so as to jointly adjust the working position of the liquid filling switching valve.

[0011] According to a hydraulic control system provided by the present invention, the first working oil port is connected to the inlet of the oil pump and the filling check valve. The second working oil port is connected to the oil tank. The third working oil port is connected to the first control oil port.

[0012] In the pressure output position, the first working oil port is connected to the third working oil port; in the pressure cut-off position, the second working oil port is connected to the third working oil port.

[0013] The fourth working oil port is connected to the oil pump, the fifth working oil port is connected to the oil tank, and the second control oil port is connected to the oil pump.

[0014] When the fluid filling position is reached, the fourth working oil port and the fifth working oil port are mutually cut off; when the fluid filling is cut off, the fourth working oil port and the fifth working oil port are mutually connected.

[0015] According to a hydraulic control system provided by the present invention, the elastic force of the first control spring is equal to the critical filling pressure value of the filling valve. The elastic force of the second control spring is less than the output pressure value of the oil pump.

[0016] According to a hydraulic control system provided by the present invention, a brake control valve group is provided between the braking unit and the accumulator group. The brake control valve group is used to switch the connection state between the accumulator group and the braking unit.

[0017] According to a hydraulic control system provided by the present invention, a pressure detection device is provided between the throttling element and the filling check valve.

[0018] According to a hydraulic control system provided by the present invention, the throttling element includes a damping orifice, the diameter of which includes 0.8mm-1.5mm.

[0019] According to a hydraulic control system provided by the present invention, the braking unit includes a front axle brake and a rear axle brake. The accumulator group includes a front axle accumulator and a rear axle accumulator. The front axle brake is connected to the front axle accumulator. The rear axle brake is connected to the rear axle accumulator. Both the front axle accumulator and the rear axle accumulator are connected to a filling check valve. A first shut-off check valve is provided between the front axle accumulator and the filling check valve. A second shut-off check valve is provided between the rear axle accumulator and the filling check valve. The throttling element is connected in parallel with the first shut-off check valve.

[0020] According to a hydraulic control system provided by the present invention, an oil filter is provided between the oil pump and the filling check valve. An anti-clogging check valve is connected in parallel to the oil filter.

[0021] According to a second aspect of the present invention, a working machine is provided, including a hydraulic control system as described above.

[0022] With this structural design, the leakage rate of oil from the outlet side of the filling check valve to its inlet side is significantly reduced due to the throttling effect of the throttling element. Consequently, the pressure decay rate at the pressure feedback control port of the accumulator group is reduced. Compared with existing technologies, the hydraulic control system of this application can reduce the starting frequency of the filling valve, which not only reduces energy waste but also effectively protects the filling valve and extends its service life. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a system schematic diagram of the hydraulic control system provided by the present invention;

[0025] Figure label:

[0026] 100. Filling valve; 110. Filling check valve; 120. Pressure feedback control valve; 121. Pressure output position; 122. Pressure cut-off position; 123. First working port; 124. Second working port; 125. Third working port; 126. Pressure feedback control port; 127. First control spring; 130. Filling switching valve; 131. Filling position; 132. Filling cut-off position; 133. Fourth working port; 134. Fifth working port; 13 5. First control port; 136. Second control port; 137. Second control spring; 200. Throttling element; 301. Front axle brake; 302. Rear axle brake; 401. Front axle accumulator; 402. Rear axle accumulator; 501. First shut-off check valve; 502. Second shut-off check valve; 601. Oil pump; 602. Oil tank; 700. Brake control valve assembly; 800. Pressure detection device; 901. Oil filter; 902. Anti-clogging check valve. Detailed Implementation

[0027] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0028] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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 device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0030] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] In the description of this specification, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate different embodiments or examples and features of different embodiments or examples described in this specification to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer. The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The following is combined with Figure 1 This invention describes a hydraulic control system and a working machine according to embodiments of the present invention. It should be understood that the following description is merely an illustrative embodiment of the invention and does not constitute any particular limitation on the invention.

[0033] An embodiment of the first aspect of the present invention provides a hydraulic control system, such as Figure 1 As shown, the hydraulic control system includes: an accumulator group, a braking unit, a filling valve 100, an oil source, and a throttling element 200.

[0034] The filling valve 100 includes a filling check valve 110 and a filling control valve assembly. An oil source is connected to an accumulator assembly via the filling check valve 110. The accumulator assembly is connected to a braking unit. The filling control valve assembly is equipped with a pressure feedback control port 126. The filling control valve assembly can control the connection state between the filling check valve 110 and the oil source based on the pressure value at the pressure feedback control port 126. One end of the throttling element 200 is connected to the accumulator assembly, and the other end is connected to both the filling check valve 110 and the pressure feedback control port 126.

[0035] In the hydraulic control system provided by this invention, the inlet of the filling check valve 110 is connected to an oil source, and the outlet of the filling check valve 110 is connected to an accumulator group. A pressure feedback control port 126 is provided on the filling control valve group. The pressure feedback control port 126 is connected to the oil port of the accumulator group, and the pressure of the accumulator group can be fed back to the pressure feedback control port 126 via a pipeline. A critical filling pressure value is set in the filling control valve group. The filling control valve group can control the connection state of the oil source to the filling check valve 110 based on the pressure value at the pressure feedback control port 126. For example, when the pressure value at the pressure feedback control port 126 is lower than the critical filling pressure value of the filling valve 100, the filling control valve group controls the filling check valve 110 to connect to the oil source, the filling valve 100 opens, and the filling check valve 110 fills the accumulator group. When the pressure value at the pressure feedback control port 126 is greater than or equal to the critical filling pressure value of the filling valve 100, the filling control valve group controls the filling check valve 110 to close to the oil tank 602, and the filling valve 100 stops filling the accumulator group.

[0036] A throttling element 200 is installed between the pressure feedback control port 126 of the accumulator group and the filling control valve group, and the filling check valve 110. Specifically, one end of the throttling element 200 is connected to the accumulator group, and the other end is connected to the outlet of the filling check valve 110 and the pressure feedback control port 126 of the filling control valve group. When the filling check valve 110 experiences wear, resulting in poor pressure holding performance, the oil in the accumulator group will slowly leak from the outlet side of the filling check valve 110 to the inlet side via the throttling element 200.

[0037] With this structural design, the leakage rate of oil from the outlet side of the charging check valve 110 to its inlet side is significantly reduced under the throttling effect of the throttling element 200. Consequently, the pressure decay rate at the pressure feedback control port 126 is reduced. This lowers the starting frequency of the charging valve 100, reducing energy waste and effectively protecting it, thus extending its service life. Furthermore, reducing the starting frequency of the charging valve 100 also reduces pipeline vibration in the hydraulic system.

[0038] In one embodiment of the invention, the throttling element 200 includes a damping orifice. For example, the diameter of the damping orifice includes 0.8 mm to 1.5 mm.

[0039] In one embodiment of the present invention, a pressure detection device 800 is provided between the throttling element 200 and the filling check valve 110. By providing the pressure detection device 800 between the throttling element 200 and the filling check valve 110, the operator can monitor the rate of decrease of the oil pressure in the pipeline between the throttling element 200 and the filling check valve 110, thereby indirectly determining the pressure-holding performance of the filling check valve 110.

[0040] In one embodiment of the present invention, the braking unit includes a front axle brake 301 and a rear axle brake 302. The accumulator group includes a front axle accumulator 401 and a rear axle accumulator 402. The front axle brake 301 is connected to the front axle accumulator 401. The rear axle brake 302 is connected to the rear axle accumulator 402. Both the front axle accumulator 401 and the rear axle accumulator 402 are connected to a filling check valve 110. A first shut-off check valve 501 is provided between the front axle accumulator 401 and the filling check valve 110. A second shut-off check valve 502 is provided between the rear axle accumulator 402 and the filling check valve 110. A throttling element 200 is connected in parallel with the first shut-off check valve 501.

[0041] For example, such as Figure 1 As shown, the power source of the front axle brake 301 and the power source of the rear axle brake 302 are independent of each other and do not affect each other. That is, the front axle accumulator 401 is connected to the front axle brake 301 and is used to independently supply oil to the front axle brake 301. The rear axle accumulator 402 is connected to the rear axle brake 302 and is used to independently supply oil to the rear axle brake 302. A first shut-off check valve 501 is provided between the front axle accumulator 401 and the filling check valve 110. A second shut-off check valve 502 is provided between the rear axle accumulator 402 and the filling check valve 110. When the filling control valve group controls the filling check valve 110 to connect with the oil source, the hydraulic oil at the oil source is replenished to the front axle accumulator 401 and the rear axle accumulator 402 via the filling check valve 110, the first shut-off check valve 501, and the second shut-off check valve 502, respectively. After the filling is completed, the first shut-off check valve 501 and the second shut-off check valve 502 are shut off.

[0042] Furthermore, a throttling element 200 is connected in parallel at the first shut-off check valve 501. During operation, the pressure value of the front axle accumulator 401 can be fed back to the pressure feedback control port 126 of the filling control valve assembly via the throttling element 200, so that the filling control valve assembly can control the connection state between the filling check valve 110 and the oil source based on this pressure value. With this structural arrangement, the oil in the rear axle accumulator 402 can be completely supplied to the rear axle brake 302, thereby improving the braking reliability of the rear axle brake 302.

[0043] In one embodiment of the present invention, the filling control valve group includes a pressure feedback control valve 120 and a filling switching valve 130, and the oil source includes an oil pump 601 and an oil tank 602.

[0044] The pressure feedback control valve 120 includes a pressure output position 121 and a pressure cutoff position 122. The pressure feedback control valve 120 also includes a first working port 123, a second working port 124, a third working port 125, a pressure feedback control port 126, and a first control spring 127. The pressure feedback control port 126 and the first control spring 127 are located at opposite ends of the pressure feedback control valve 120 to jointly adjust the operating position of the pressure feedback control valve 120.

[0045] The filling switching valve 130 includes a filling position 131 and a filling stop position 132. The filling switching valve 130 also includes a fourth working port 133, a fifth working port 134, a first control port 135, a second control port 136, and a second control spring 137. The first control port 135 and the second control spring 137 are located at one end of the filling switching valve 130, and the second control port 136 is located at the other end of the filling switching valve 130, to jointly adjust the working position of the filling switching valve 130.

[0046] Furthermore, in one embodiment of the present invention, the first working oil port 123 is connected to the inlet of the oil pump 601 and the filling check valve 110. The second working oil port 124 is connected to the oil tank 602. The third working oil port 125 is connected to the first control oil port 135.

[0047] When the pressure output position is 121, the first working oil port 123 is connected to the third working oil port 125; when the pressure cut-off position is 122, the second working oil port 124 is connected to the third working oil port 125.

[0048] The fourth working oil port 133 is connected to the oil pump 601. The fifth working oil port 134 is connected to the oil tank 602. The second control oil port 136 is connected to the oil pump 601.

[0049] When the filling level is 131, the fourth working oil port 133 and the fifth working oil port 134 are mutually cut off; when the filling cut-off level is 132, the fourth working oil port 133 and the fifth working oil port 134 are mutually connected.

[0050] More specifically, in one embodiment of the invention, the elastic force of the first control spring 127 is equal to the critical filling pressure value of the filling valve 100. The elastic force of the second control spring 137 is less than the output pressure value of the oil pump 601.

[0051] refer to Figure 1 Specifically, for example, the pressure feedback control valve 120 includes a two-position three-way directional valve; the filling switching valve 130 includes a two-position two-way proportional directional valve. The pressure feedback control port 126 of the pressure feedback control valve 120 is located at the left end of its valve core, and the first control spring 127 is located at the right end of its valve core. The right position of the pressure feedback control valve 120 is the pressure output position 121, and the left position is the pressure cut-off position 122. The first control port 135 and the second control spring 137 of the filling switching valve 130 are located at the left end of its valve core, and the second control port 136 is located at the right end of its valve core. The left position of the filling switching valve 130 is the filling position 131, and the right position is the filling cut-off position 132.

[0052] exist Figure 1 In the illustrated embodiment, the filling valve 100 is in a filling state. Specifically, the oil inlet of the oil pump 601 is connected to the oil tank 602. The output oil from the oil pump 601 can flow to the second control port 136 of the filling switching valve 130 and the first working port 123 of the pressure feedback control valve 120. The oil at the first working port 123 of the pressure feedback control valve 120 can flow to the first control port 135 of the filling switching valve 130. At this time, the pressure at the first control port 135 is equal to the pressure at the second control port 136. Under the action of the second control spring 137, the filling switching valve 130 switches to the left position, i.e., the filling position 131, so that the oil pump 601 can fill the accumulator group with oil through the filling check valve 110.

[0053] When the front axle accumulator 401 is not full of oil, the pressure value fed back from the front axle accumulator 401 to the pressure feedback control port 126 is always less than the critical filling pressure value set by the filling valve 100, i.e., the elastic force of the first control spring 127. Therefore, under the action of the first control spring 127, the pressure feedback control valve 120 can remain in the right position, i.e., the pressure output position 121. At this time, the filling switching valve 130 can also remain in the filling position 131. The hydraulic oil output by the oil pump 601 can continuously replenish the front axle accumulator 401 and the rear axle accumulator 402 through the filling check valve 110.

[0054] As the oil level in the front axle accumulator 401 increases, the pressure fed back from the accumulator 401 to the pressure feedback control port 126 gradually increases until this pressure exceeds the spring force of the first control spring 127. At this point, the pressure feedback control valve 120 switches to the left position, i.e., the pressure cutoff position 122. At this time, the first control port 135 connects to the oil tank 602, and the pressure at the second control port 136 overcomes the spring force of the second control spring 137, driving the filling switching valve 130 to switch to the right position, i.e., the filling cutoff position 132. The oil pump 601 connects to the oil tank 602 through the fourth working port 133 and the fifth working port 134 of the filling switching valve 130. The oil pump 601 stops filling the accumulator assembly.

[0055] In one embodiment of the present invention, a brake control valve assembly 700 is provided between the braking unit and the accumulator group. The brake control valve assembly 700 is used to switch the connection state between the accumulator group and the braking unit.

[0056] For example, the brake control valve assembly 700 may include a front axle brake control valve and a rear axle brake control valve. One side of the front axle brake control valve is connected to the front axle accumulator 401, and the other side is connected to the front axle brake 301. By controlling the operating state of the front axle brake control valve, the front axle accumulator 401 and the front axle brake 301 are connected or disconnected to achieve front axle braking or front axle brake release. One side of the rear axle brake control valve is connected to the rear axle accumulator 402, and the other side is connected to the rear axle brake 302. By controlling the operating state of the rear axle brake control valve, the rear axle accumulator 402 and the rear axle brake 302 are connected or disconnected to achieve rear axle braking or rear axle brake release. The front and rear axle braking can be performed simultaneously or independently.

[0057] In one embodiment of the present invention, an oil filter 901 is provided between the oil pump 601 and the filling check valve 110. An anti-clogging check valve 902 is connected in parallel to the oil filter 901. By providing the oil filter 901 between the oil pump 601 and the filling check valve 110, the cleanliness of the oil input to the filling check valve 110 can be ensured, thereby reducing wear caused by impurities in the oil on the filling check valve 110. When the oil filter 901 becomes clogged, hydraulic oil can be input into the hydraulic system through the anti-clogging check valve 902.

[0058] A second aspect of the present invention provides a working machine including a hydraulic control system as described above.

[0059] For example, the aforementioned operating machinery includes excavators.

[0060] It should be understood that the above embodiments are merely illustrative examples of the present invention and should not be construed as limiting the invention in any way. That is, the above-described operating machinery includes, but is not limited to, excavators. For example, in other embodiments of the present invention, the above-described operating machinery may also include crane trucks or loader trucks, etc.

[0061] Furthermore, since the machine includes the hydraulic control system described above, it also possesses the advantages described above.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic control system, characterized in that, Includes accumulator assembly, braking unit, charging valve, oil source, and throttling element. The filling valve includes a filling check valve and a filling control valve assembly. The oil source is connected to the accumulator assembly through the filling check valve. The accumulator assembly is connected to the braking unit. The filling control valve assembly is provided with a pressure feedback control port. The filling control valve assembly can control the connection state between the filling check valve and the oil source based on the pressure value of the pressure feedback control port. One end of the throttling element is connected to the accumulator assembly, and the other end of the throttling element is connected to the filling check valve and the pressure feedback control port. The filling control valve assembly includes a pressure feedback control valve and a filling switching valve, and the oil source includes an oil pump and an oil tank. The pressure feedback control valve includes a pressure output position and a pressure cutoff position. It also includes a first working port, a second working port, a third working port, a pressure feedback control port, and a first control spring. The pressure feedback control port and the first control spring are located at opposite ends of the pressure feedback control valve to jointly adjust its operating position. The liquid filling switching valve includes a liquid filling position and a liquid filling stop position. The liquid filling switching valve also includes a fourth working oil port, a fifth working oil port, a first control oil port, a second control oil port, and a second control spring. The first control oil port and the second control spring are located at one end of the liquid filling switching valve, and the second control oil port is located at the other end of the liquid filling switching valve, so as to jointly adjust the working position of the liquid filling switching valve.

2. The hydraulic control system according to claim 1, characterized in that, The first working oil port is connected to the inlet of the oil pump and the filling check valve; the second working oil port is connected to the oil tank; and the third working oil port is connected to the first control oil port. In the pressure output position, the first working oil port is connected to the third working oil port; in the pressure cut-off position, the second working oil port is connected to the third working oil port. The fourth working oil port is connected to the oil pump, the fifth working oil port is connected to the oil tank, and the second control oil port is connected to the oil pump. When the fluid filling position is reached, the fourth working oil port and the fifth working oil port are mutually cut off; when the fluid filling is cut off, the fourth working oil port and the fifth working oil port are mutually connected.

3. The hydraulic control system according to claim 2, characterized in that, The elastic force of the first control spring is equal to the critical filling pressure value of the filling valve, and the elastic force of the second control spring is less than the output pressure value of the oil pump.

4. The hydraulic control system according to claim 1, characterized in that, A brake control valve group is provided between the braking unit and the accumulator group, and the brake control valve group is used to switch the connection state between the accumulator group and the braking unit.

5. The hydraulic control system according to claim 1, characterized in that, A pressure detection device is provided between the throttling element and the liquid filling check valve.

6. The hydraulic control system according to claim 1, characterized in that, The throttling element includes a damping orifice with a diameter ranging from 0.8 mm to 1.5 mm.

7. The hydraulic control system according to claim 1, characterized in that, The braking unit includes a front axle brake and a rear axle brake. The accumulator group includes a front axle accumulator and a rear axle accumulator. The front axle brake is connected to the front axle accumulator, and the rear axle brake is connected to the rear axle accumulator. Both the front axle accumulator and the rear axle accumulator are connected to the filling check valve. A first shut-off check valve is provided between the front axle accumulator and the filling check valve, and a second shut-off check valve is provided between the rear axle accumulator and the filling check valve. The throttling element is connected in parallel with the first shut-off check valve.

8. The hydraulic control system according to claim 1, characterized in that, An oil filter is provided between the oil pump and the filling check valve, and an anti-clogging check valve is connected in parallel on the oil filter.

9. A type of operating machinery, characterized in that, Includes a hydraulic control system according to any one of claims 1 to 8.

Images