Hydraulic control systems and operating machinery

Abstract

The present invention relates to the technical field of hydraulic systems, and proposes a hydraulic control system and an operating machine. The hydraulic control system includes a first hydraulic pump, a second hydraulic pump, a first actuator group, a second actuator group, and a merging valve. The first hydraulic pump is connected to the first actuator group via a merging valve. The second hydraulic pump is connected to the second actuator group via a merging valve. The merging valve can switch between a merging position and a diverting position. In the merging position, the first hydraulic pump and the second hydraulic pump merge to supply the first actuator group and the second actuator group; in the diverting position, the first hydraulic pump supplies the first actuator group, and the second hydraulic pump supplies the second actuator group. With this structural arrangement, only one merging valve needs to be provided at the oil outlet of the first hydraulic pump and the oil outlet of the second hydraulic pump to achieve the merging of the two pumps to supply the first actuator group and the second actuator group, and the cost is relatively low.

Description

Technical Field

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

[0002] Excavators are widely used earthmoving machines. Hydraulic systems are typically used to control the excavator's boom, slewing, arm, bucket, and travel movements. Within the hydraulic control system, two hydraulic pumps are typically deployed to group and supply the excavator's actuators. For example, one hydraulic pump supplies the boom cylinder, bucket cylinder, and left travel motor; another pump supplies the slewing motor, arm cylinder, and right travel motor. Conventional technology typically incorporates a combining valve at the front end of each boom cylinder and bucket cylinder, respectively, to allow the two pumps to combine and supply the arm and boom cylinders under desired operating conditions. This configuration requires multiple combining valves, which is costly. Summary of the Invention

[0003] The present invention provides a hydraulic control system and an operating machine, which are used to solve or improve the problem that a plurality of converging valves are usually provided in the existing hydraulic control system, which results in high cost.

[0004] According to a first aspect of the present invention, a hydraulic control system is provided, comprising a first hydraulic pump, a second hydraulic pump, a first actuator group, a second actuator group, and a merging valve. The first hydraulic pump is connected to the first actuator group via the merging valve. The second hydraulic pump is connected to the second actuator group via the merging valve.

[0005] The merging valve is switchable between a merging position and a diverting position. In the merging position, the first hydraulic pump and the second hydraulic pump merge to supply the first and second actuator groups; in the diverting position, the first hydraulic pump supplies the first actuator group, and the second hydraulic pump supplies the second actuator group.

[0006] According to the present invention, a hydraulic control system further includes a first unloading valve and a second unloading valve. One oil port of the first unloading valve is connected to the first hydraulic pump, while the other oil port of the first unloading valve is connected to the first actuator group and the oil tank, respectively. One oil port of the second unloading valve is connected to the second hydraulic pump, while the other oil port of the second unloading valve is connected to the second actuator group and the oil tank, respectively.

[0007] According to a hydraulic control system provided by the present invention, the first unloading valve is switchable between a first unloading position and a first oil supply position. In the first unloading position, the first hydraulic pump is connected to the oil tank; in the first oil supply position, the first hydraulic pump is connected to the first actuator group.

[0008] The second unloading valve can be switched between a second unloading position and a second oil supply position. In the second unloading position, the second hydraulic pump is connected to the oil tank; in the second oil supply position, the second hydraulic pump is connected to the second actuator group.

[0009] According to a hydraulic control system provided by the present invention, the merging valve includes a merging cone valve and a merging switching valve.

[0010] The converging cone valve includes a conical cavity, an annular cavity, and a spring cavity. The conical cavity is connected to the first hydraulic pump. The annular cavity is connected to the second hydraulic pump. The spring cavity is connected to one oil port of the converging switching valve, while the other oil port of the converging switching valve is connected to the oil tank. The converging switching valve is switchable between the converging position and the diverting position.

[0011] When the first unloading valve is in the first unloading position, the second unloading valve is in the second unloading position, and the merging switching valve is in the diverting position, the oil tank replenishes oil into the spring chamber to cut off the tapered chamber and the annular chamber from each other; when the first unloading valve is in the first oil supply position, the second unloading valve is in the second oil supply position, and the merging switching valve is in the merging position, the oil in the spring chamber flows into the oil tank to communicate with each other.

[0012] According to a hydraulic control system provided by the present invention, the first actuator group includes a rotary actuator assembly, an arm actuator assembly and a right travel actuator assembly.

[0013] The rotary actuator assembly includes a rotary reversing valve and a rotary motor. One oil port of the rotary reversing valve is connected to the tapered cavity and the oil tank, and the other oil port of the rotary reversing valve is connected to the oil inlet and return port of the rotary motor respectively.

[0014] The boom actuator assembly includes a boom reversing valve and a boom cylinder. One oil port of the boom reversing valve is connected to the tapered cavity and the oil tank, and the other oil port of the reversing valve is connected to the rod cavity and the rodless cavity of the boom cylinder.

[0015] The right travel actuator assembly includes a right travel reversing valve and a right travel motor. One side oil port of the right travel reversing valve is connected to the tapered cavity and the oil tank, and the other side working oil port of the right travel reversing valve is connected to the oil inlet and return port of the right travel motor.

[0016] According to a hydraulic control system provided by the present invention, the second actuator group includes a boom actuator assembly, a left travel actuator assembly and a bucket actuator assembly.

[0017] The boom actuator assembly includes a boom reversing valve and a boom cylinder. One oil port of the boom reversing valve is connected to the annular cavity and the oil tank, and the other oil port of the boom reversing valve is connected to the rod cavity and the rodless cavity of the boom cylinder.

[0018] The left travel actuator assembly includes a left travel reversing valve and a left travel motor. One side oil port of the left travel reversing valve is connected to the annular cavity and the oil tank, and the other side oil port of the left travel reversing valve is connected to the oil inlet and oil return port of the left travel motor.

[0019] The bucket actuator assembly includes a bucket reversing valve and a bucket oil cylinder. One side oil port of the bucket reversing valve is connected to the annular cavity and the oil tank, and the other side oil port of the bucket reversing valve is connected to the rod cavity and the rodless cavity of the bucket oil cylinder.

[0020] According to a hydraulic control system provided by the present invention, the first actuator group further includes a bulldozer actuator assembly, and the second actuator group further includes a standby actuator assembly.

[0021] The bulldozer actuator assembly includes a bulldozer reversing valve and a bulldozer oil cylinder. One oil port of the bulldozer reversing valve is connected to the tapered cavity and the oil tank, and the other oil port of the bulldozer reversing valve is connected to the rod cavity and the rodless cavity of the bulldozer oil cylinder.

[0022] The backup actuating assembly includes a backup reversing valve and a backup actuating mechanism. The backup reversing valve is connected between the annular cavity and the backup actuating mechanism.

[0023] According to a hydraulic control system provided by the present invention, priority logic valves are provided between the rotary reversing valve and the conical cavity, between the dipper arm reversing valve and the conical cavity, between the right travel reversing valve and the conical cavity, between the bucket reversing valve and the annular cavity, between the standby reversing valve and the annular cavity, and between the left travel reversing valve and the annular cavity.

[0024] The priority logic valve includes a first working oil port and a second working oil port. The priority logic valve is switchable between a communication position and a damped communication position. In the communication position, the first working oil port is directly connected to the second working oil port. In the damped communication position, the first working oil port communicates with the second working oil port through a damping orifice.

[0025] According to a hydraulic control system provided by the present invention, the rotary reversing valve, the dipper arm reversing valve, the right travel reversing valve, the boom reversing valve, the left travel reversing valve, the bucket reversing valve, the bulldozer reversing valve and the spare reversing valve are all three-position four-way reversing valves.

[0026] According to a second aspect of the present invention, there is provided a working machine comprising the hydraulic control system described above.

[0027] In the hydraulic control system provided by the present invention, the first hydraulic pump and the second hydraulic pump are connected to the first actuator group and the second actuator group respectively through a merging valve. In other words, the merging valve is arranged at the outlet of the first hydraulic pump and the second hydraulic pump, and is connected to the first actuator group and the second actuator group. It should be understood here that the first actuator group and the second actuator group respectively include multiple action execution parts. For example, the multiple action execution parts include a boom execution part, a bucket execution part, a walking execution part, a rotation execution part and a bucket execution part, etc. The merging valve can be switched between a merging position and a diversion position. When the merging valve is in the merging position, the flow output by the first hydraulic pump and the second hydraulic pump is merged and supplied to the first actuator group and the second actuator group. When the merging valve is in the diversion position, the flow output by the first hydraulic pump is supplied to the first actuator group, and the flow output by the second hydraulic pump is supplied to the second actuator group.

[0028] According to the above description, in this hydraulic control system, only a merging valve needs to be set at the oil outlet of the first hydraulic pump and the oil outlet of the second hydraulic pump to realize the merging of the two pumps to supply the first actuator group and the second actuator group, which is relatively low in cost.

[0029] In addition, since the first actuator group and the second actuator group respectively include multiple small actuator parts, the first hydraulic pump and the second hydraulic pump can merge and supply each small actuator part in the first actuator group and the second actuator group after the merging action of the merging valve, and the range of the merged supply is relatively large.

[0030] Setting the unloading valve independently can simplify the valve core structure of the main control valve of each actuator and reduce costs.

[0031] Furthermore, in the working machine provided by the present invention, since it includes the hydraulic control system as described above, it also has the advantages as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0033] Figure 1 This is a schematic diagram of the principle of the hydraulic control system provided by the present invention;

[0034] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle;

[0035] Reference numerals:

[0036] 101, first hydraulic pump; 102, second hydraulic pump; 200, converging valve; 201, converging cone valve; 202, converging switching valve; 203, converging position; 204, diverting position; 301, first unloading valve; 302, first unloading position; 303, first oil supply position; 304, second unloading valve; 305, second unloading position; 306, second oil supply position; 401, arm reversing valve; 402, arm Cylinder; 403, slewing reversing valve; 404, slewing motor; 405, right travel reversing valve; 406, right travel motor; 407, bulldozer reversing valve; 501, boom reversing valve; 502, boom cylinder; 503, left travel reversing valve; 504, left travel motor; 505, bucket reversing valve; 506, bucket cylinder; 507, spare reversing valve; 600, priority logic valve; 700, safety valve. DETAILED DESCRIPTION

[0037] The following embodiments of the present invention are described in further detail with reference to 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.

[0038] 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", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship 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 device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on the specific circumstances.

[0040] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a 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 at a higher level than the second feature. A first feature being "below," "below," and "below" a 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 at a lower level than the second feature.

[0041] 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 can 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 can 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 this field without making creative work are within the scope of protection of the present invention.

[0042] The following combination Figure 1 and Figure 2 A hydraulic control system and a working machine provided by an embodiment of the present invention are described. It should be understood that the following description is merely an illustrative embodiment of the present invention and does not constitute any particular limitation to the present invention.

[0043] An embodiment of the first aspect of the present invention provides a hydraulic control system, such as Figure 1 and Figure 2 As shown, the hydraulic control system includes a first hydraulic pump 101, a second hydraulic pump 102, a first actuator group, a second actuator group, and a merging valve 200. The first hydraulic pump 101 is connected to the first actuator group via the merging valve 200. The second hydraulic pump 102 is connected to the second actuator group via the merging valve 200.

[0044] The merging valve 200 can be switched between a merging position 203 and a diverting position 204. In the merging position 203, the first hydraulic pump 101 and the second hydraulic pump 102 merge to supply the first and second actuator groups. In the diverting position 204, the first hydraulic pump 101 supplies the first actuator group, and the second hydraulic pump 102 supplies the second actuator group.

[0045] In the hydraulic control system provided by the present invention, the first hydraulic pump 101 and the second hydraulic pump 102 are connected to the first and second actuator groups, respectively, via a merging valve 200. In other words, the merging valve 200 is disposed at the outlets of the first and second hydraulic pumps 101, 102 and is connected to the first and second actuator groups. It should be understood that the first and second actuator groups each include multiple motion-executing components. For example, these multiple motion-executing components may include a boom actuator, a bucket actuator, a travel actuator, a swing actuator, and a bucket actuator. The merging valve 200 can be switched between a merging position 203 and a diversion position. When the merging valve 200 is in the merging position 203, the outputs of the first and second hydraulic pumps 101, 102 merge and are supplied to the first and second actuator groups. When the merging valve 200 is in the diversion position 204, the output of the first hydraulic pump 101 is supplied to the first actuator group, and the output of the second hydraulic pump 102 is supplied to the second actuator group.

[0046] According to the above description, in this hydraulic control system, only a merging valve 200 needs to be set at the oil outlet of the first hydraulic pump 101 and the oil outlet of the second hydraulic pump 102 to realize the merging of the two pumps to supply the first actuator group and the second actuator group, and the cost is relatively low.

[0047] In addition, since the first actuator group and the second actuator group respectively include multiple small actuator parts, the first hydraulic pump 101 and the second hydraulic pump 102 can merge and supply each small actuator part in the first actuator group and the second actuator group after the merging action of the merging valve 200, and the range of the merged supply is relatively large.

[0048] In one embodiment of the present invention, the hydraulic control system further includes a first unloading valve 301 and a second unloading valve 304. One oil port of the first unloading valve 301 is connected to the first hydraulic pump 101, and the other oil port of the first unloading valve 301 is connected to the first actuator group and the oil tank, respectively. One oil port of the second unloading valve 304 is connected to the second hydraulic pump 102, and the other oil port of the second unloading valve 304 is connected to the second actuator group and the oil tank, respectively.

[0049] Furthermore, in one embodiment of the present invention, the first unloading valve 301 is switchable between a first unloading position 302 and a first oil supply position 303. In the first unloading position 302, the first hydraulic pump 101 is connected to the oil tank, and in the first oil supply position 303, the first hydraulic pump 101 is connected to the first actuator group.

[0050] The second unloading valve 304 can be switched between a second unloading position 305 and a second oil supply position 306. In the second unloading position 305, the second hydraulic pump 102 is connected to the oil tank. In the second oil supply position 306, the second hydraulic pump 102 is connected to the second actuator group.

[0051] For example, Figure 1 As shown, the first unloading valve 301 and the second unloading valve 304 are both two-position, four-way reversing valves. For a detailed description of the first unloading valve 301, the first unloading valve 301 includes a first working oil port, a second working oil port, a third working oil port, and a fourth working oil port. The first and second working oil ports are both connected to the first hydraulic pump 101 via the merging valve 200, the third working oil port is connected to the fuel tank, and the fourth working oil port is connected to the first actuator group. When the first unloading valve 301 is in the first unloading position 302, the first working oil port is connected to the fourth working oil port, and the second working oil port is connected to the third working oil port. At this point, the first hydraulic pump 101 is connected to both the first actuator group and the fuel tank via the merging valve 200. Due to the lower pressure on the fuel tank side, all the oil output by the first hydraulic pump 101 flows into the fuel tank, and the first hydraulic pump 101 is in an unloaded state. When the first unloading valve 301 is in the first oil supply position 303, the first and fourth working oil ports are connected, and the second and third working oil ports are blocked. At this point, the first hydraulic pump 101 is connected only to the first actuator group through the converging valve 200 to supply oil to the first actuator group.

[0052] In the prior art, an unloading valve is typically installed within the actuator's directional control valve. In other words, the same directional control valve functions as the actuator's forward operating position, reverse operating position, and unloading position. By adjusting the spool position of the directional control valve, the oil supply to the actuator can be regulated. For example, when the hydraulic pump's output flow exceeds the actuator's requirements, the directional control valve must be switched to a semi-open state. Part of the flow is supplied to the actuator through the directional control valve, while the remaining flow returns to the oil tank through the semi-open oil port in the unloading position. This results in a partial loss of unloading energy. In the present application, a first unloading valve 301 and a second unloading valve 304 are separately provided at the outlets of the first hydraulic pump 101 and the second hydraulic pump 102. When unloading is not required, the first unloading valve 301 can be switched to the first oil supply position 303, and the second unloading valve 304 can be switched to the second oil supply position 306. At this time, the oil output by the hydraulic pump will not flow back into the oil tank through the first unloading valve 301 and the second unloading valve 304, thereby reducing unloading losses.

[0053] In one embodiment of the present invention, the merging valve 200 includes a merging cone valve 201 and a merging switching valve 202 .

[0054] The converging cone valve 201 comprises a conical cavity, an annular cavity, and a spring cavity. The conical cavity is connected to the first hydraulic pump 101. The annular cavity is connected to the second hydraulic pump 102. The spring cavity is connected to one oil port of the converging switching valve 202, while the other oil port of the converging switching valve 202 is connected to the oil tank. The converging switching valve 202 can switch between a converging position 203 and a diverging position 204.

[0055] When the first unloading valve 301 is in the first unloading position 302, the second unloading valve 304 is in the second unloading position 305, and the merging switching valve 202 is in the diverting position 204, the oil tank replenishes oil into the spring chamber to cut off the conical chamber and the annular chamber from each other; when the first unloading valve 301 is in the first oil supply position 303, the second unloading valve 304 is in the second oil supply position 306, and the merging switching valve 202 is in the merging position 203, the oil in the spring chamber flows into the oil tank to connect the annular chamber and the conical chamber to each other.

[0056] Specifically, if Figure 1 and Figure 2As shown, a valve core is provided in the valve body of the converging cone valve 201. The valve core can divide the inner cavity of the valve body into a conical cavity, an annular cavity and a spring cavity in sequence. Among them, a spring is provided in the spring cavity. The converging reversing valve is a two-position, two-way reversing valve. The two-position, two-way reversing valve includes two working oil ports. One of the working oil ports is connected to the spring cavity, and the other working oil port is connected to the oil tank. The converging reversing valve can switch between the converging position 203 and the diverting position 204. When the converging reversing valve is switched to the converging position 203, its two working oil ports are directly connected. When the converging reversing valve is switched to the diverting position 204, its two working oil ports are connected to each other through a one-way valve. The oil inlet of the one-way valve is connected to the working oil port on the oil tank side, and the oil outlet of the one-way valve is connected to the oil port on the spring cavity side.

[0057] During operation, when the first hydraulic pump 101 and the second hydraulic pump 102 need to merge to supply the first and second actuator groups, the first unloading valve 301 is switched to the first oil supply position 303, the second unloading valve 304 is switched to the second oil supply position 306, and the merging reversing valve is switched to the merging position 203. At this time, the oil in the spring chamber flows into the oil tank. Under the joint action of the first hydraulic pump 101 and the second hydraulic pump 102, the valve core is driven to overcome the spring force and move, so that the conical chamber and the annular chamber are connected to each other. After the first hydraulic pump 101 and the second hydraulic pump 102 merge, they jointly supply the first and second actuator groups.

[0058] When the first hydraulic pump 101 is required to supply the first actuator group and the second hydraulic pump 102 to the second actuator group, the first unloading valve 301 is switched to the first unloading position 302, the second unloading valve 304 is switched to the second unloading position 305, and the converging reversing valve is switched to the diverting position 204. At this point, the oil in the oil tank is replenished into the spring chamber through the one-way valve. Under the combined action of the spring and hydraulic pressure, the valve core is driven to move, thereby isolating the conical chamber and the annular chamber from each other. Subsequently, the first unloading valve 301 is switched to the first oil supply position 303, and the second unloading valve 304 is switched to the second oil supply position 306. Thus, the first hydraulic pump 101 supplies the first actuator group alone, and the second hydraulic pump 102 supplies the second actuator group alone.

[0059] In one embodiment of the present invention, the first actuator group includes a rotation actuator assembly, an arm actuator assembly and a right travel actuator assembly.

[0060] The rotary actuator assembly includes a rotary reversing valve 403 and a rotary motor 404. One side oil port of the rotary reversing valve 403 is connected to the tapered cavity and the oil tank, and the other side oil port of the rotary reversing valve 403 is connected to the oil inlet and oil return port of the rotary motor 404 respectively.

[0061] The boom actuator assembly includes a boom reversing valve 401 and a boom cylinder 402. One side oil port of the boom reversing valve 401 is connected to the conical cavity and the oil tank, and the other oil port of the reversing valve 403 is connected to the rod cavity and the rodless cavity of the boom cylinder 402.

[0062] The right travel execution assembly includes a right travel reversing valve 405 and a right travel motor 406. One side oil port of the right travel reversing valve 405 is connected to the tapered cavity and the oil tank, and the other side working oil port of the right travel reversing valve 405 is connected to the oil inlet and oil return port of the right travel motor 406.

[0063] Furthermore, in yet another embodiment of the present invention, the second actuator group includes a boom actuator assembly, a left travel actuator assembly, and a bucket actuator assembly.

[0064] The boom actuator assembly includes a boom reversing valve 501 and a boom cylinder 502. One side of the boom reversing valve 501 is connected to the annular cavity and the oil tank, while the other side of the boom reversing valve 501 is connected to the rod cavity and the rodless cavity of the boom cylinder 502.

[0065] The left travel execution assembly includes a left travel reversing valve 503 and a left travel motor 504. One side oil port of the left travel reversing valve 503 is connected to the annular cavity and the oil tank, and the other side oil port of the left travel reversing valve 503 is connected to the oil inlet and oil return port of the left travel motor 504.

[0066] The bucket actuator assembly includes a bucket reversing valve 505 and a bucket cylinder 506. One side oil port of the bucket reversing valve 505 is connected to the annular cavity and the oil tank, and the other side oil port of the bucket reversing valve 505 is connected to the rod cavity and the rodless cavity of the bucket cylinder 506.

[0067] In one embodiment of the present invention, the rotary reversing valve 403, the arm reversing valve 401, the right travel reversing valve 405, the boom reversing valve 501, the left travel reversing valve 503 and the bucket reversing valve 505 are all three-position four-way reversing valves.

[0068] refer to Figure 1 To describe, in this embodiment, when the combining valve 200 is in the diversion position 204, the first hydraulic pump 101 independently supplies the rotary actuator, the dipper arm actuator and the right travel actuator; the second hydraulic pump 102 independently supplies the boom actuator, the left travel actuator and the bucket actuator.

[0069] In this embodiment, the slew reversing valve 403, the arm reversing valve 401, the right travel reversing valve 405, the boom reversing valve 501, the bucket reversing valve 505, and the left travel reversing valve 503 are all three-position, four-way proportional reversing valves. Each three-position, four-way reversing valve has a forward operating position, a reverse operating position, and a cutoff position. The forward and reverse operating positions are used to control the operating direction of the slew motor 404, the arm cylinder 402, the right travel motor 406, the boom cylinder 502, the bucket cylinder 506, and the left travel motor 504. The cutoff position shuts off the first hydraulic pump 101 from the slew motor 404, the arm cylinder 402, and the right travel motor 406, or shuts off the second hydraulic pump 102 from the boom cylinder 502, the bucket cylinder 506, and the left travel motor 504. In addition, hydraulic locks are installed between the boom reversing valve 401 and the boom cylinder 402, and between the boom reversing valve 501 and the boom cylinder 502 to improve the working safety of the boom and the boom.

[0070] In one embodiment of the present invention, the first actuator group further includes a bulldozer actuator assembly, and the second actuator group further includes a standby actuator assembly.

[0071] The bulldozer actuator assembly includes a bulldozer reversing valve 407 and a bulldozer oil cylinder. One side oil port of the bulldozer reversing valve 407 is connected to the tapered cavity and the oil tank, and the other side oil port of the bulldozer reversing valve 407 is connected to the rod cavity and rodless cavity of the bulldozer oil cylinder.

[0072] The standby actuator assembly includes a standby reversing valve 507 and a standby actuator. The standby reversing valve 507 is connected between the annular cavity and the standby actuator.

[0073] like Figure 1 As shown, in one embodiment of the present invention, both the bulldozer reversing valve 407 and the backup reversing valve 507 are three-position, four-way reversing valves. The bulldozer reversing valve 407 includes a forward working position, a reverse working position, and a cutoff position. Similarly, the forward and reverse working positions are used to control the operating direction of the bulldozer cylinder. The cutoff position is used to shut off the first hydraulic pump 101 and the bulldozer cylinder.

[0074] The standby reversing valve 507 is used to control the working state of the standby actuator. For example, the standby actuator includes but is not limited to a standby motor or a standby cylinder, and the specific type of the standby actuator can be driven automatically according to actual needs.

[0075] According to the embodiments described above, it can be seen that independently providing the unloading valve can simplify the valve core structure of the main control valve of each actuator and reduce costs.

[0076] In another embodiment of the present invention, priority logic valves 600 are provided between the reversing valve 403 and the conical cavity, between the dipper arm reversing valve 401 and the conical cavity, between the right travel reversing valve 405 and the conical cavity, between the bucket reversing valve 505 and the annular cavity, between the standby reversing valve 507 and the annular cavity, and between the left travel reversing valve 503 and the annular cavity.

[0077] Priority logic valve 600 includes a first operating oil port and a second operating oil port. Priority logic valve 600 can be switched between a communication position and a damped communication position. In the communication position, the first operating oil port is directly connected to the second operating oil port. In the damped communication position, the first operating oil port communicates with the second operating oil port through a damping orifice.

[0078] Since the boom has the highest priority, a priority logic valve 600 is arranged between the boom reversing valve 501 and the annular cavity. With this structural arrangement, as long as the first hydraulic pump 101 and the second hydraulic pump 102 merge, they can be combined to supply the boom cylinder 502 with priority. Figure 1 Only a portion of the priority logic valves 600 are shown schematically. In actual operation, for example, when the merging reversing valve is switched to the merging position 203 and the combined flow of the first and second hydraulic pumps 101, 102 requires priority supply to the arm cylinder 402, the priority logic valve 600 between the arm reversing valve 401 and the tapered chamber is switched to the connecting position, while the remaining priority logic valves 600 are switched to the damping connecting position. At this point, the combined flow of the first and second hydraulic pumps 101, 102 is preferentially supplied to the arm reversing valve 401 and the boom reversing valve 501, with only a small amount of flow being supplied through the damping orifice to other control valves such as the bucket reversing valve 505.

[0079] In one embodiment of the present invention, safety valves 700 are separately provided between the first unloading valve 301 and the second unloading valve 304 and the first actuator group, and in the dipper arm actuator assembly, the bulldozer actuator assembly, the boom actuator assembly, the bucket actuator assembly and the spare actuator assembly.

[0080] For example, Figure 1 As shown, in this embodiment, the safety valves 700 provided between the first unloading valve 301 and the first actuator, and between the second unloading valve 304 and the second actuator, are master safety valves 700. The operating oil ports of the first unloading valve 301 and the second unloading valve 304 are both connected to the oil inlet of the master safety valve 700. Furthermore, check valves are provided between the operating oil ports of the first unloading valve 301 and the second unloading valve 304 and the oil inlet of the master safety valve 700. The oil inlet of the check valve is connected to the operating oil port of the first unloading valve 301 or the operating oil port of the second unloading valve 304. The oil outlet of each check valve is connected to the oil inlet of the master safety valve 700.

[0081] In addition, a safety valve 700 is independently installed between the boom reversing valve 401 and the boom cylinder 402, between the bulldozer reversing valve 407 and the bulldozer cylinder, between the boom reversing valve 501 and the boom cylinder 502, between the bucket reversing valve 505 and the bucket cylinder 506, and between the standby reversing valve 507 and the standby actuator to improve the operating safety of each actuator component.

[0082] The hydraulic control system provided by the present invention further includes a control device. Each control valve can be configured as a solenoid valve. The control device drives the control valve to switch to different working states based on the electrical signal of each solenoid valve.

[0083] An embodiment of the second aspect of the present invention provides a working machine including the hydraulic control system described above.

[0084] For example, the above-mentioned working machine is an excavator.

[0085] It should be understood that the above embodiment is merely an illustrative embodiment of the present invention and does not constitute any limitation to the present invention. In other words, the above working machine includes but is not limited to an excavator.

[0086] Furthermore, in the working machine provided by the present invention, since it includes the hydraulic control system as described above, it also has the advantages as described above.

[0087] 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 various embodiments of the present invention.

Claims

1. A hydraulic control system, characterized in that: The system comprises a first hydraulic pump, a second hydraulic pump, a first actuator group, a second actuator group and a merging valve, wherein the first hydraulic pump is connected to the first actuator group through the merging valve, and the second hydraulic pump is connected to the second actuator group through the merging valve. The merging valve is switchable between a merging position and a diverting position. In the merging position, the first hydraulic pump and the second hydraulic pump merge to supply the first and second actuator groups; in the diverting position, the first hydraulic pump supplies the first actuator group, and the second hydraulic pump supplies the second actuator group. The hydraulic control system further includes a first unloading valve and a second unloading valve, wherein one side oil port of the first unloading valve is connected to the first hydraulic pump, and the other side oil port of the first unloading valve is respectively connected to the first actuator group and the oil tank; one side oil port of the second unloading valve is connected to the second hydraulic pump, and the other side oil port of the second unloading valve is respectively connected to the second actuator group and the oil tank; The first unloading valve can be switched between a first unloading position and a first oil supply position. In the first unloading position, the first hydraulic pump is connected to the oil tank. In the first oil supply position, the first hydraulic pump is connected to the first actuator group. The second unloading valve can be switched between a second unloading position and a second oil supply position. In the second unloading position, the second hydraulic pump is connected to the oil tank. In the second oil supply position, the second hydraulic pump is connected to the second actuator group. The merging valve includes a merging cone valve and a merging switching valve. The converging cone valve includes a conical cavity, an annular cavity, and a spring cavity. The conical cavity is connected to the first hydraulic pump, the annular cavity is connected to the second hydraulic pump, the spring cavity is connected to one side oil port of the converging switching valve, and the other side oil port of the converging switching valve is connected to the oil tank. The converging switching valve can switch between the converging position and the diverting position. When the first unloading valve is in the first unloading position, the second unloading valve is in the second unloading position, and the merging switching valve is in the diverting position, the oil tank replenishes oil into the spring chamber to cut off the tapered chamber and the annular chamber from each other; when the first unloading valve is in the first oil supply position, the second unloading valve is in the second oil supply position, and the merging switching valve is in the merging position, the oil in the spring chamber flows into the oil tank to communicate with each other.

2. The hydraulic control system according to claim 1, characterized in that: The first actuator group includes a rotary actuator assembly, an arm actuator assembly and a right travel actuator assembly. The rotary actuator assembly includes a rotary reversing valve and a rotary motor, wherein an oil port on one side of the rotary reversing valve is connected to the tapered cavity and the oil tank, and an oil port on the other side of the rotary reversing valve is respectively connected to an oil inlet and an oil return port of the rotary motor; The boom actuator assembly includes a boom reversing valve and a boom cylinder, one side oil port of the boom reversing valve is connected to the tapered cavity and the oil tank, and the other oil port of the reversing valve is connected to the rod cavity and the rodless cavity of the boom cylinder; The right travel execution component includes a right travel reversing valve and a right travel motor. The oil port on one side of the right travel reversing valve is connected to the conical cavity and the oil tank, and the working oil port on the other side of the right travel reversing valve is connected to the oil inlet and return port of the right travel motor.

3. The hydraulic control system according to claim 2, characterized in that: The second actuator group includes a boom actuator assembly, a left travel actuator assembly and a bucket actuator assembly. The boom actuator assembly includes a boom reversing valve and a boom oil cylinder, wherein one side oil port of the boom reversing valve is connected to the annular cavity and the oil tank, and the other side oil port of the boom reversing valve is connected to the rod cavity and the rodless cavity of the boom oil cylinder; The left travel actuator assembly includes a left travel reversing valve and a left travel motor, one side oil port of the left travel reversing valve is connected to the annular cavity and the oil tank, and the other side oil port of the left travel reversing valve is connected to the oil inlet and oil return port of the left travel motor; The bucket actuator assembly includes a bucket reversing valve and a bucket cylinder. One side oil port of the bucket reversing valve is connected to the annular cavity and the oil tank, and the other side oil port of the bucket reversing valve is connected to the rod cavity and the rodless cavity of the bucket cylinder.

4. The hydraulic control system according to claim 3, characterized in that: The first actuator group further includes a bulldozer actuator assembly, and the second actuator group further includes a standby actuator assembly. The bulldozer actuator assembly includes a bulldozer reversing valve and a bulldozer oil cylinder. One side oil port of the bulldozer reversing valve is connected to the tapered cavity and the oil tank, and the other side oil port of the bulldozer reversing valve is connected to the rod cavity and the rodless cavity of the bulldozer oil cylinder. The backup actuating assembly includes a backup reversing valve and a backup actuating mechanism, and the backup reversing valve is connected between the annular cavity and the backup actuating mechanism.

5. The hydraulic control system according to claim 4, characterized in that: Priority logic valves are provided between the reversing valve and the conical cavity, between the arm reversing valve and the conical cavity, between the right travel reversing valve and the conical cavity, between the bucket reversing valve and the annular cavity, between the standby reversing valve and the annular cavity, and between the left travel reversing valve and the annular cavity. The priority logic valve includes a first working oil port and a second working oil port. The priority logic valve can be switched between a connecting position and a damping connecting position. In the connecting position, the first working oil port is directly connected to the second working oil port; in the damping connecting position, the first working oil port is connected to the second working oil port through a damping hole.

6. The hydraulic control system according to claim 4, characterized in that: The rotary reversing valve, the arm reversing valve, the right travel reversing valve, the boom reversing valve, the left travel reversing valve, the bucket reversing valve, the bulldozer reversing valve and the spare reversing valve are all three-position four-way reversing valves.

7. A working machine, characterized in that: Comprising a hydraulic control system according to any one of claims 1 to 6.

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