A hydraulic mutual assistance system, a hydraulic mutual assistance method, and an engineering trolley

Abstract

Embodiments of the present invention provide a hydraulic mutual assistance system, a hydraulic mutual assistance method and an engineering vehicle, which relate to the field of engineering vehicles. The hydraulic mutual assistance system includes: a chassis working pump group, a priority valve, a steering and braking valve, an auxiliary action valve group, a mutual assistance reversing valve, a boom working pump group and a boom action valve group; wherein, the output end of the boom working pump group is communicated with the input end of the boom action valve group, the output end of the chassis working pump group is communicated with the input end of the priority valve, the priority output end of the priority valve is communicated with the steering and braking valve, the non-priority output end of the priority valve is simultaneously communicated with the auxiliary action valve group and one end of the mutual assistance reversing valve, and the other end of the mutual assistance reversing valve is used to be communicated with the input end of the boom action valve group in the mutual assistance operation state.

Description

Technical Field

[0001] The present invention relates to the field of engineering vehicles, and more particularly, to a hydraulic mutual assistance system, a hydraulic mutual assistance method and an engineering vehicle. Background Art

[0002] When an engineering vehicle is operating, it is usually driven by a chassis working pump group, a first boom working pump group and a second boom working pump group respectively to complete different actions.

[0003] However, when one of the pump groups is damaged, the corresponding operation action of that pump group cannot be completed. Especially when one of the boom pump groups is damaged, the operation range of the other boom pump group cannot be fully covered, which has a negative impact on the progress of tunnel construction. Summary of the Invention

[0004] The present invention provides a hydraulic mutual assistance system, a hydraulic mutual assistance method and an engineering vehicle, which can perform hydraulic mutual assistance between different working pump groups to avoid having a negative impact on the progress of tunnel construction due to the damage of one of the working pump groups.

[0005] Embodiments of the present invention may be implemented as follows:

[0006] In a first aspect, an embodiment of the present invention provides a hydraulic mutual assistance system, which includes:

[0007] A chassis working pump group, a priority valve, a steering brake valve, an auxiliary action valve group, a mutual assistance reversing valve, a boom working pump group and a boom action valve group;

[0008] Wherein, the output end of the boom working pump group is communicated with the input end of the boom action valve group, the output end of the chassis working pump group is communicated with the input end of the priority valve, the priority output end of the priority valve is communicated with the steering brake valve, the non-priority output end of the priority valve is simultaneously communicated with the auxiliary action valve group and one end of the mutual assistance reversing valve, and the other end of the mutual assistance reversing valve is used to be communicated with the input end of the boom action valve group in the mutual assistance operation state;

[0009] The boom working pump group includes a first boom working pump group and a second boom working pump group, and the boom action valve group includes a first boom action valve group and a second boom action valve group;

[0010] The output end of the first boom working pump group is communicated with the input end of the first boom action valve group, the output end of the second boom working pump group is communicated with the input end of the second boom action valve group, and the mutual assistance reversing valve is used to selectively communicate with the input end of the first boom action valve group and the input end of the second boom action valve group in the mutual assistance operation state;

[0011] When the mutual aid reversing valve is not working, one end of it remains connected to the chassis working pump set, and the other end is simultaneously disconnected from the input ends of the first boom operation valve set and the second boom operation valve set;

[0012] Under normal working conditions, the chassis working pump set drives the auxiliary operation valve set to perform normal operations; the boom working pump set drives the boom operation valve set to perform normal operations;

[0013] When any one of the chassis working pump set and the boom working pump set is damaged, the mutual aid reversing valve is connected to the boom operation valve set, so that the boom operation valve set can be connected to the auxiliary operation valve set to achieve hydraulic mutual aid.

[0014] Optionally, the auxiliary operation valve set includes a first auxiliary valve set and a second auxiliary valve set arranged in parallel. The output end of the first auxiliary valve set is simultaneously connected to a first rear leg lifting unit and a second rear leg lifting unit, and the output end of the second auxiliary valve set is connected to a sliding action unit.

[0015] Optionally, the hydraulic mutual aid system includes a pressure building valve and a fuel tank. The pressure building valve is arranged on the pipeline between the priority valve and the first auxiliary valve set. The pressure building valve is used to be connected to the fuel tank in the non-working state, and the pressure building valve is used to regulate the oil flow entering the first auxiliary valve set in the working state.

[0016] Optionally, the hydraulic mutual aid system further includes a variable pressure on-off valve, a first overflow valve and a second overflow valve. The variable pressure on-off valve and the first overflow valve are sequentially arranged on the pipeline between the priority valve and the first auxiliary valve set, and the second overflow valve is arranged on the pipeline between the priority valve and the second auxiliary valve set;

[0017] When the first rear leg lifting unit and the second rear leg lifting unit are in the low-pressure working state, the variable pressure on-off valve is turned on and the first overflow valve works; or, when the sliding action unit is in the high-pressure working state, the variable pressure on-off valve is turned off and the second overflow valve pauses.

[0018] Optionally, the hydraulic mutual aid system further includes a first variable pump, a first rock drilling control valve and a third overflow valve. The first variable pump is simultaneously connected to the rock drilling valve and the first boom operation valve set through a first load feedback oil circuit, and the third overflow valve is arranged on the first load feedback second;

[0019] And / or, the hydraulic mutual aid system further includes a second variable pump, a second rock drilling control valve and a fourth overflow valve. The second variable pump is simultaneously connected to the rock drilling control valve and the second boom operation valve set through a second load feedback oil circuit, and the fourth overflow valve is arranged on the second load feedback oil circuit.

[0020] Optionally, the hydraulic mutual assistance system further includes a first rock drilling unit and a first on-off valve. The first variable pump is connected between the first boom working pump group and the first rock drilling unit, and the first on-off valve is arranged on the first load feedback oil circuit;

[0021] The hydraulic mutual assistance system further includes a second rock drilling unit and a second on-off valve. The second variable pump is connected between the second boom working pump group and the second rock drilling unit, and the second on-off valve is arranged on the second load feedback oil circuit.

[0022] Optionally, the hydraulic mutual assistance system further includes a first rock drilling unit and a first on-off valve. The first variable pump is connected between the first boom working pump group and the first rock drilling unit, and the first on-off valve is arranged on the first load feedback oil circuit;

[0023] A first mutual assistance branch is connected between the first variable pump and the second variable pump, and a first mutual assistance on-off valve is arranged on the first mutual assistance branch.

[0024] Optionally, the hydraulic mutual assistance system further includes a first rock drilling unit and a first on-off valve. The first variable pump is connected between the first boom working pump group and the first rock drilling unit, and the first on-off valve is arranged on the first load feedback oil circuit;

[0025] A second mutual assistance branch is connected between the first rock drilling control valve and the second rock drilling control valve, and a second mutual assistance on-off valve is arranged on the second mutual assistance branch.

[0026] Optionally, the hydraulic mutual assistance system further includes a first boom driving unit, a first rock drilling driving motor, and a first reversing valve. The first boom working pump group, the first boom driving unit, the first reversing valve, and the first rock drilling driving motor are connected in sequence, and the first reversing valve is selectively connected to the forward rotation end or the reverse rotation end of the first rock drilling driving motor;

[0027] And / or, the hydraulic mutual assistance system further includes a second boom driving unit, a second rock drilling driving motor, and a second reversing valve. The second boom working pump group, the second boom driving unit, the second reversing valve, and the second rock drilling driving motor are connected in sequence, and the second reversing valve is selectively connected to the forward rotation end or the reverse rotation end of the second rock drilling driving motor.

[0028] In a second aspect, an embodiment of the present invention further provides a hydraulic mutual assistance method implemented by the hydraulic mutual assistance system. The hydraulic mutual assistance method includes:

[0029] In the normal working state, the chassis working pump group and the boom working pump group operate independently;

[0030] In an abnormal operating state, the chassis working pump group supplies oil to the boom operation valve group through the mutual aid reversing valve, or the boom working pump group supplies oil to the auxiliary operation valve group through the mutual aid reversing valve.

[0031] In a third aspect, an embodiment of the present invention further provides an engineering vehicle, including the hydraulic mutual aid system, and / or for implementing the hydraulic mutual aid method.

[0032] The beneficial effects of the hydraulic mutual aid system according to the embodiments of the present invention include, for example:

[0033] The hydraulic mutual aid system includes: a chassis working pump group, a priority valve, a steering brake valve, an auxiliary operation valve group, a mutual aid reversing valve, a boom working pump group, and a boom operation valve group; wherein, the output end of the boom working pump group is communicated with the input end of the boom operation valve group, the output end of the chassis working pump group is communicated with the input end of the priority valve, the priority output end of the priority valve is communicated with the steering brake valve, the non-priority output end of the priority valve is simultaneously communicated with the auxiliary operation valve group and one end of the mutual aid reversing valve, and the other end of the mutual aid reversing valve is used to be communicated with the input end of the boom operation valve group in a mutual aid operation state. In a normal working state, the mutual aid reversing valve does not work, and the chassis working pump group and the boom working pump group respectively drive different valve groups to perform normal operations; when an abnormality occurs, that is, when one of the working pump groups is damaged, the mutual aid reversing valve is communicated with the boom operation valve group, so that the boom operation valve group can be communicated with the auxiliary operation valve group to realize hydraulic mutual aid, thereby avoiding a negative impact on the progress of tunnel construction due to the damage of one of the working pump groups.

[0034] The double-boom hydraulic vehicle includes a hydraulic mutual aid system and can implement the hydraulic mutual aid method, thereby improving the efficiency of tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other relevant drawings can also be obtained based on these drawings.

[0036] Figure 1 It is a hydraulic circuit schematic diagram of the hydraulic mutual aid system provided in the embodiments of the present invention.

[0037] Icons: 100 - Hydraulic mutual assistance system; 110 - Chassis working pump group; 111 - Priority valve; 112 - Steering brake valve; 113 - Auxiliary action valve group; 1131 - First auxiliary valve group; 1132 - Second auxiliary valve group; 1135 - Sliding action unit; 114 - Mutual assistance reversing valve; 115 - Pressure building valve; 116 - Fuel tank; 117 - Pressure transformation on-off valve; 118 - First overflow valve; 119 - Second overflow valve;

[0038] 130 - First arm working pump group; 131 - First arm action valve group; 132 - First rock drilling unit; 133 - First hind leg lifting unit; 134 - First variable pump; 135 - First rock drilling control valve; 136 - Third overflow valve; 137 - First load feedback oil circuit; 138 - First on-off valve; 139 - First arm drive unit; 140 - First rock drilling drive motor; 141 - First reversing valve; 142 - Fifth overflow valve;

[0039] 150 - Second arm working pump group; 151 - Second arm action valve group; 152 - Second rock drilling unit; 153 - Second hind leg lifting unit; 154 - Second variable pump; 155 - Second rock drilling control valve; 156 - Fourth overflow valve; 157 - Second load feedback oil circuit; 158 - Second on-off valve; 159 - Second arm drive unit; 160 - Second rock drilling drive motor; 161 - Second reversing valve; 162 - Sixth overflow valve;

[0040] 170 - First mutual assistance branch; 171 - First mutual assistance on-off valve; 180 - Second mutual assistance branch; 181 - Second mutual assistance on-off valve. Detailed implementation mode

[0041] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0043] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the invention product is usually placed during use, it is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0045] In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0046] The term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0047] Unless otherwise expressly specified and limited, terms such as "arranged", "connected", etc. should be understood in a broad sense. For example, "connected" 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, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] It should be noted that, without conflict, the features in the embodiments of the present invention can be combined with each other.

[0049] Embodiment 1

[0050] Please refer to Figure 1 , an embodiment of the present invention provides a hydraulic mutual assistance system 100, which includes: a chassis working pump group 110, a priority valve 111, a steering and braking valve 112, an auxiliary action valve group 113, a mutual assistance reversing valve 114, a boom working pump group, and a boom action valve group.

[0051] Among them, the output end of the boom working pump group is communicated with the input end of the boom action valve group, the output end of the chassis working pump group 110 is communicated with the input end of the priority valve 111, the priority output end of the priority valve 111 is communicated with the steering brake valve 112, and the non-priority output end of the priority valve 111 is simultaneously communicated with one end of the auxiliary action valve group 113 and the mutual assistance reversing valve 114. The other end of the mutual assistance reversing valve 114 is used to be communicated with the input end of the boom action valve group in the mutual assistance operation state.

[0052] In the normal working state, the mutual assistance reversing valve 114 does not work, and the chassis working pump group 110 and the boom working pump group drive different valve groups to perform normal operations respectively; when an abnormality occurs, that is, when one of the working pump groups is damaged, the mutual assistance reversing valve 114 is communicated with the boom action valve group, so that the boom action valve group can be communicated with the auxiliary action valve group 113 to realize hydraulic mutual assistance, thereby avoiding having a negative impact on the progress of tunnel construction due to the damage of one of the working pump groups.

[0053] In this embodiment, the number of booms is two, that is, the boom working pump group includes the first boom working pump group 130 and the second boom working pump group 150, and the boom action valve group includes the first boom action valve group 131 and the second boom action valve group 151. Of course, in other embodiments of the present invention, the number of booms can also be one, three, five, etc., and the specific set number is not limited.

[0054] It should be noted that when the mutual assistance reversing valve 114 does not work, one end of it can remain communicated with the chassis working pump group 110, and the other end is simultaneously disconnected from the input ends of the first boom action valve group 131 and the second boom action valve group 151; when the mutual assistance reversing valve 114 works, the other end is selectively communicated with the input ends of the first boom action valve group 131 and the second boom action valve group 151, thereby realizing the liquid path communication between the auxiliary action valve group 113 and the first boom action valve group 131 and the second boom action valve group 151, and thus achieving the hydraulic mutual assistance effect.

[0055] Moreover, during the hydraulic mutual assistance operation, the flow of the oil circuit is bidirectional, that is, when the chassis working pump group 110 is damaged, the auxiliary action valve group 113 can receive oil for action; when the first boom working pump group 130 or the second boom working pump group 150 is damaged, the first boom working valve group and the second boom working valve group can receive oil for action.

[0056] It is worth noting that the steering brake valve 112 can be a valve for realizing steering action and braking action. Because its action priority is relatively high, the oil supply priority should also be higher than that of the auxiliary action valve group 113. In addition, the valve group mentioned in the embodiments of the present invention can be a combination of multiple valves, or a general term for a single valve and other components, and the specific composition is not limited.

[0057] Please refer to Figure 1 that the auxiliary action valve group 113 includes a first auxiliary valve group 1131 and a second auxiliary valve group 1132 arranged in parallel. The output end of the first auxiliary valve group 1131 is simultaneously connected to a first hind leg lifting unit 133 and a second hind leg lifting unit 153, and the output end of the second auxiliary valve group 1132 is connected to a sliding action unit 1135.

[0058] In the working state, when the first arm action valve group 131 or the second arm action valve group 151 drives the corresponding execution unit to act, the first hind leg lifting unit 133 and the second hind leg lifting unit 153 will also perform corresponding actions; in addition, before the first arm and the second arm reach the working position, the sliding action unit 1135 usually acts to drive them to the appropriate working position.

[0059] Please refer to Figure 1 that the hydraulic mutual assistance system 100 includes a pressure building valve 115 and a fuel tank 116. The pressure building valve 115 is arranged on the pipeline between the priority valve 111 and the first auxiliary valve group 1131. The pressure building valve 115 is used to communicate with the fuel tank 116 in the non-working state, and the pressure building valve is used to regulate the oil flow rate entering the first auxiliary valve group 1131 in the working state.

[0060] It should be noted that when the pressure building valve 115 is not working, it only provides the function of returning oil to the fuel tank 116 for the pipeline between the priority valve 111 and the first auxiliary valve group 1131 to avoid excessive oil pressure entering the first auxiliary valve group 1131 and increasing the load of the subsequent pipeline; when performing hydraulic mutual assistance operations, the pressure building valve 115 starts to build pressure, and then appropriately reduces the oil flow rate entering the first auxiliary valve group 1131 to facilitate the flow of oil towards other valve groups.

[0061] Please refer to Figure 1 that the hydraulic mutual assistance system 100 further includes a variable pressure on-off valve 117, a first overflow valve 118, and a second overflow valve 119. The variable pressure on-off valve 117 and the first overflow valve 118 are sequentially arranged on the pipeline between the priority valve 111 and the first auxiliary valve group 1131, and the second overflow valve 119 is arranged on the pipeline between the priority valve 111 and the second auxiliary valve group 1132;

[0062] The first hind leg lifting unit 133 and the second hind leg lifting unit 153 are used to drive the variable pressure on-off valve 117 to conduct and drive the first overflow valve 118 to work in the low-pressure working state; or, the sliding action unit 1135 is used to drive the variable pressure on-off valve 117 to disconnect and drive the second overflow valve 119 to pause in the high-pressure working state.

[0063] The hydraulic mutual assistance system 100 can also perform high and low pressure mutual assistance operations. When the first hind leg lifting unit 133 or the second hind leg lifting unit needs low pressure operation, the working pressure can be limited to low pressure through the first overflow valve 118. When the sliding action unit 1135 needs high pressure operation, the overflow oil of the first overflow valve 118 can be cut off by disconnecting the variable pressure conduction valve, and more oil can be introduced into the second auxiliary valve group 1132.

[0064] Please refer to Figure 1 , the hydraulic mutual assistance system 100 further includes a first variable pump 134, a first rock drilling control valve 135, and a third overflow valve 136. The first variable pump 134 is connected to both the first rock drilling control valve 135 and the first arm action valve group 131 through a first load feedback oil circuit 137, and the third overflow valve 136 is arranged on the first load feedback oil circuit 137;

[0065] Meanwhile, the hydraulic mutual assistance system 100 can further include a second variable pump 154, a second rock drilling control valve 155, and a fourth overflow valve 156. The second variable pump 154 is connected to both the second rock drilling control valve 155 and the second arm action valve group 151 through a second load feedback oil circuit 157, and the fourth overflow valve 156 is arranged on the second load feedback oil circuit 157.

[0066] During the operation process, by setting the first variable pump 134 and the first load feedback oil circuit 137, and the second variable pump 154 and the second load feedback oil circuit 157, it is used to realize the sensitive feedback regulation of the oil. When the oil pressure of the first rock drilling control valve 135 and the first arm action valve group 131, and the second arm action valve group 151 and the second rock drilling control valve 155 is too high, the first variable pump 134 or the second variable pump 154 can be driven to perform output adjustment to reduce the oil pressure of the subsequent pump group or valve group. Moreover, during the feedback process, the third overflow valve 136 and the fourth overflow valve 156 can respectively play a role of overflow pressure relief for the first load feedback oil circuit 137 and the second load feedback oil circuit 157 to further improve the timeliness of the adjustment.

[0067] In this embodiment, the third overflow valve 136 and the fourth overflow valve 156 are preferably proportional overflow valves.

[0068] Please refer to Figure 1 , the hydraulic mutual assistance system 100 further includes a first rock drilling unit 132 and a first on-off valve 138. The first variable pump 134 is connected between the first arm working pump group 130 and the first rock drilling unit 132, and the first on-off valve 138 is arranged on the first load feedback oil circuit 137;

[0069] Meanwhile, the hydraulic mutual assistance system 100 further includes a second rock drilling unit 152 and a second on-off valve 158. The second variable pump 154 is connected between the second boom working pump group 150 and the second rock drilling unit 152, and the second on-off valve 158 is arranged in the second load feedback oil circuit 157.

[0070] It should be noted that the first variable pump 134 can adjust the pressure of the first rock drilling unit 132 by opening the first on-off valve 138; similarly, the second variable pump 154 can adjust the pressure of the second rock drilling unit 152 by opening the second on-off valve 158.

[0071] Please refer to Figure 1 , to further improve the convenience of hydraulic mutual assistance, hydraulic mutual assistance can also be carried out between the first boom and the second boom, that is, a first mutual assistance branch 170 is connected between the first variable pump 134 and the second variable pump 154, and a first mutual assistance on-off valve 171 is arranged on the first mutual assistance branch 170;

[0072] Similarly, a second mutual assistance branch 180 can be connected between the first rock drilling control valve 135 and the second rock drilling control valve 155, and a second mutual assistance on-off valve 181 is arranged on the second mutual assistance branch 180.

[0073] When the first mutual assistance on-off valve 171 is opened, hydraulic mutual assistance can be achieved between the first variable pump 134 and the second variable pump 154; when the second mutual assistance on-off valve 181 is opened, hydraulic mutual assistance can be achieved between the first rock drilling control valve 135 and the second rock drilling control valve 155.

[0074] Please refer to Figure 1 , the hydraulic mutual assistance system 100 further includes a first boom drive unit 139, a first rock drilling drive motor 140 and a first reversing valve 141. The first boom working pump group 130, the first boom drive unit 139, the first reversing valve 141 and the first rock drilling drive motor 140 are connected in sequence, and the first reversing valve 141 is selectively connected to the forward rotation end and the reverse rotation end of the first rock drilling drive motor 140;

[0075] The hydraulic mutual assistance system 100 further includes a second boom drive unit 159, a second rock drilling drive motor 160 and a second reversing valve 161. The second boom working pump group 150, the second boom drive unit 159, the second reversing valve 161 and the second rock drilling drive motor 160 are connected in sequence, and the second reversing valve 161 is selectively connected to the forward rotation end and the reverse rotation end of the second rock drilling drive motor 160.

[0076] During the working process, in order to further achieve precise control of the first rock drilling unit 132, the first reversing valve 141 can be set for reversing operation to drive the first rock drilling drive motor 140 to rotate forward or backward; similarly, the second reversing valve 161 can be set for reversing operation to drive the second rock drilling drive motor 160 to rotate forward or backward.

[0077] It should be noted that in order to avoid excessive pipeline oil pressure, a fifth overflow valve 142 can be connected to the pipeline between the first arm drive unit 139 and the first reversing valve 141, and a sixth overflow valve 162 can be connected to the pipeline between the second arm drive unit 159 and the second reversing valve 161.

[0078] Embodiment 2

[0079] An embodiment of the present invention also provides a hydraulic mutual assistance method, which is implemented by the hydraulic mutual assistance system 100. The hydraulic mutual assistance method includes:

[0080] In the normal working state, the chassis working pump group 110 and the boom working pump group (specifically, the first boom working pump group 130 and the second boom working pump group 150) operate independently;

[0081] In the abnormal working state, the chassis working pump group 110 supplies oil to the boom working valve group (specifically, the first boom action valve group 131 or the second boom action valve group 151) through the mutual assistance reversing valve 114, or the boom working pump group (specifically, the first boom working pump group 130 or the second boom working pump group 150) supplies oil to the auxiliary action valve group 113 through the mutual assistance reversing valve 114.

[0082] Embodiment 3

[0083] An embodiment of the present invention also provides an engineering vehicle, including a hydraulic mutual assistance system 100, and the engineering vehicle can be used to implement the hydraulic mutual assistance method.

[0084] As mentioned above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A hydraulic mutual assistance system, characterized in that: include: A chassis working pump group (110), a priority valve (111), a steering brake valve (112), an auxiliary action valve group (113), a mutual assistance reversing valve (114), a boom working pump group, and a boom action valve group; The output end of the boom working pump group is communicated with the input end of the boom action valve group, the output end of the chassis working pump group (110) is communicated with the input end of the priority valve (111), the priority output end of the priority valve (111) is communicated with the steering brake valve (112), the non-priority output end of the priority valve (111) is simultaneously communicated with the auxiliary action valve group (113) and one end of the mutual assistance reversing valve (114), and the other end of the mutual assistance reversing valve (114) is used to communicate with the input end of the boom action valve group in a mutual assistance operation state; The boom working pump group comprises a first arm working pump group (130) and a second arm working pump group (150); the boom actuation valve group comprises a first arm actuation valve group (131) and a second arm actuation valve group (151); The output end of the first arm working pump group (130) is communicated with the input end of the first arm actuating valve group (131), the output end of the second arm working pump group (150) is communicated with the input end of the second arm actuating valve group (151), and the mutual assistance reversing valve (114) is used to selectively communicate with the input end of the first arm actuating valve group (131) or the input end of the second arm actuating valve group (151) in a mutual assistance operation state; When the mutual-assist reversing valve (114) is not working, one end thereof remains connected to the chassis working pump group (110), and the other end is disconnected from the input end of the first arm actuating valve group (131) and the input end of the second arm actuating valve group (151). In a normal working state, the mutual assistance reversing valve does not work, the chassis working pump group (110) drives the auxiliary action valve group (113) to operate normally; the boom working pump group drives the boom action valve group to operate normally; When any one of the chassis working pump group (110) and the boom working pump group is damaged, the mutual assistance reversing valve is connected to the boom action valve group, so that the boom action valve group can be connected to the auxiliary action valve group to achieve hydraulic mutual assistance.

2. The hydraulic mutual assistance system according to claim 1, characterized in that: The auxiliary action valve group (113) comprises a first auxiliary valve group (1131) and a second auxiliary valve group (1132) arranged in parallel, the output end of the first auxiliary valve group (1131) being connected to both the first rear leg lifting unit (133) and the second rear leg lifting unit (153), and the output end of the second auxiliary valve group (1132) being connected to the sliding action unit (1135).

3. The hydraulic mutual assistance system according to claim 2, characterized in that: The hydraulic mutual assistance system comprises a pressure building valve (115) and an oil tank (116); the pressure building valve (115) is arranged in a pipeline between the priority valve (111) and the first auxiliary valve group (1131); the pressure building valve (115) is used to communicate with the oil tank (116) in a non-working state; and the pressure building valve (115) is used to regulate the oil flow entering the first auxiliary valve group (1131) in a working state.

4. The hydraulic mutual assistance system according to claim 2, characterized in that: The hydraulic mutual assistance system further comprises a variable pressure on-off valve (117), a first relief valve (118) and a second relief valve (119); the variable pressure on-off valve (117) and the first relief valve (118) are arranged in sequence in the pipeline between the priority valve (111) and the first auxiliary valve group (1131); and the second relief valve (119) is arranged in the pipeline between the priority valve (111) and the second auxiliary valve group (1132); When the first rear leg lifting unit (133) and the second rear leg lifting unit (153) are in a low-pressure working state, the variable-pressure on-off valve (117) is connected, and the first overflow valve (118) is working; or, when the sliding action unit (1135) is in a high-pressure working state, the variable-pressure on-off valve (117) is disconnected, and the second overflow valve (119) is paused.

5. The hydraulic mutual assistance system according to claim 2, characterized in that: The hydraulic mutual assistance system further comprises a first variable displacement pump (134), a first rock drilling control valve (135) and a third relief valve (136); the first variable displacement pump (134) is connected to the first rock drilling control valve (135) and the first arm action valve group (131) via a first load feedback oil circuit (137); the third relief valve (136) is arranged in the first load feedback oil circuit (137); And / or, the hydraulic mutual assistance system further comprises a second variable pump (154), a second rock drilling control valve (155) and a fourth overflow valve (156), wherein the second variable pump (154) is connected to the second rock drilling control valve (155) and the second arm action valve group (151) via a second load feedback oil circuit (157), and the fourth overflow valve (156) is arranged in the second load feedback oil circuit (157).

6. The hydraulic mutual assistance system according to claim 5, characterized in that: The hydraulic mutual assistance system further comprises a first rock drilling unit (132) and a first on-off valve (138); the first variable pump (134) is connected between the first arm working pump group (130) and the first rock drilling unit (132); and the first on-off valve (138) is arranged in the first load feedback oil circuit (137); The hydraulic mutual assistance system further comprises a second rock drilling unit (152) and a second on-off valve (158); the second variable pump (154) is connected between the second arm working pump group (150) and the second rock drilling unit (152); and the second on-off valve (158) is arranged in the second load feedback oil circuit (157).

7. The hydraulic mutual assistance system according to claim 5, characterized in that: The hydraulic mutual assistance system further comprises a first rock drilling unit (132) and a first on-off valve (138); the first variable pump (134) is connected between the first arm working pump group (130) and the first rock drilling unit (132); and the first on-off valve (138) is arranged in the first load feedback oil circuit (137); A first mutual assistance branch (170) is connected between the first variable displacement pump (134) and the second variable displacement pump (154), and a first mutual assistance on-off valve (171) is provided on the first mutual assistance branch (170).

8. The hydraulic mutual assistance system according to claim 5, characterized in that: The hydraulic mutual assistance system further comprises a first rock drilling unit (132) and a first on-off valve (138); the first variable pump (134) is connected between the first arm working pump group (130) and the first rock drilling unit (132); and the first on-off valve (138) is arranged in the first load feedback oil circuit (137); A second mutual assistance branch (180) is connected between the first rock drilling control valve (135) and the second rock drilling control valve (155), and a second mutual assistance on-off valve (181) is provided on the second mutual assistance branch (180).

9. The hydraulic mutual assistance system according to any one of claims 1 to 8, characterized in that: The hydraulic mutual assistance system further comprises a first arm driving unit (139), a first rock drilling driving motor (140) and a first reversing valve (141); the first arm working pump group (130), the first arm driving unit (139), the first reversing valve (141) and the first rock drilling driving motor (140) are connected in sequence; the first reversing valve (141) can be selectively connected to a forward rotation end or a reverse rotation end of the first rock drilling driving motor (140); And / or, the hydraulic mutual assistance system further comprises a second arm drive unit (159), a second rock drilling drive motor (160) and a second reversing valve (161); the second arm working pump group (150), the second arm drive unit (159), the second reversing valve (161) and the second rock drilling drive motor (160) are connected in sequence; and the second reversing valve (161) can be selectively connected to the forward rotation end or the reverse rotation end of the second rock drilling drive motor (160).

10. A hydraulic mutual assistance method, characterized in that: The hydraulic mutual assistance system according to any one of claims 1 to 9 is implemented, and the hydraulic mutual assistance method comprises: In a normal working state, the chassis working pump group (110) and the arm working pump group operate independently; In an abnormal working state, the chassis working pump group (110) supplies oil to the boom action valve group through the mutual assistance reversing valve (114), or the boom working pump group supplies oil to the auxiliary action valve group (113) through the mutual assistance reversing valve (114).

11. An engineering trolley, characterized in that: It comprises the hydraulic mutual assistance system as described in any one of claims 1 to 9, or is used to implement the hydraulic mutual assistance method as described in claim 10.

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