Hydraulic control system and screen scarifier

Abstract

The invention discloses a hydraulic control system and a screen cleaning machine, and relates to the technical field of hydraulic control, the hydraulic control system is used for controlling a screen cleaning power assembly and an excavation power assembly to work, and the hydraulic control system comprises a multi-connected control valve group, a first main pump, a second main pump and a stop valve. The multi-linkage control valve group comprises a ballast raking valve linkage and an excavation valve linkage assembly, the ballast raking valve linkage is used for controlling a ballast raking power element of the screen cleaning power assembly to be opened and closed, and the excavation valve linkage assembly is used for controlling an excavation power assembly to be opened and closed; the first main pump is connected with the ballast raking valve through a first oil supply channel; the second main pump is connected with the excavation valve linkage assembly through a second oil supply channel; the stop valve is used for controlling connection and disconnection of the first oil supply channel and the second oil supply channel. The hydraulic control system solves the technical problems of low working efficiency, large energy consumption and potential safety hazards caused by current rush, weak ballast raking and many working faults of a hydraulic system during cleaning operation.

Description

Technical Field

[0001] The present application relates to the technical field of hydraulic control, and in particular to a hydraulic control system and a screening machine. Background Art

[0002] At present, in order to facilitate maintenance operations such as replacement of railway sleepers, replacement of turnout ballast, line tamping, mud and slurry remediation, and repair of tree branches invading the line, multifunctional small maintenance equipment is generally used for railway maintenance operations to reduce labor and improve work efficiency.

[0003] In the related technology, maintenance equipment is often a patchwork modification of existing small excavators with high-power engines and corresponding hydraulic systems to barely achieve railway maintenance operations such as cleaning and rail grinding. However, the traditional cleaning machine modified from the excavator platform has poor matching between its mechanical structure and hydraulic control system. There are problems such as hydraulic system rushing flow, weak ballast removal, and many working failures during cleaning operations, resulting in low work efficiency, high energy consumption, and safety hazards. Summary of the invention

[0004] The purpose of this application is to provide a hydraulic control system and a screening machine, which solve the technical problems of low working efficiency, high energy consumption and potential safety hazards caused by the hydraulic system rushing flow, unable to remove ballast and many working failures during screening operations.

[0005] To achieve the above objectives, the present application provides a hydraulic control system for controlling the operation of a cleaning power assembly and an excavation power assembly, including:

[0006] A multi-valve control group, the multi-valve control group includes a ballast removal valve group and an excavation valve group assembly, the ballast removal valve group is used to control the opening and closing of the ballast removal power element of the screening power assembly, and the excavation valve group assembly is used to control the opening and closing of the excavation power assembly;

[0007] A first main pump is connected to the ballast removal valve via a first oil supply channel;

[0008] a second main pump connected to the excavation valve coupling assembly through a second oil supply passage;

[0009] A cut-off valve, provided at a confluence point of the first oil supply passage and the second oil supply passage, for controlling the connection and cut-off of the first oil supply passage and the second oil supply passage;

[0010] Among them, when the cut-off valve cuts off the first oil supply channel and the second oil supply channel, the first main pump supplies oil to the ballast removal valve assembly through the first oil supply channel, and the second main pump supplies oil to the excavation valve assembly through the second oil supply channel; when the cut-off valve connects the first oil supply channel and the second oil supply channel, the first main pump and the second main pump join together to supply oil to the excavation valve assembly.

[0011] In some embodiments, the hydraulic control system further includes a pilot control valve, which is connected to the cut-off valve via a pilot oil circuit, and the pilot control valve is used to provide pilot pressure oil to the cut-off valve to control the action of the cut-off valve.

[0012] In some embodiments, the pilot control valve is a solenoid valve, which is configured to control the cut-off valve to cut off the first oil supply channel and the second oil supply channel when energized, and to control the cut-off valve to connect the first oil supply channel and the second oil supply channel when de-energized.

[0013] In some embodiments, the hydraulic control system further includes a ballast-removing operation instruction receiving module, which is used to receive a ballast-removing operation instruction from an operator so that the ballast-removing valve link and the pilot control valve are energized to perform a ballast-removing action.

[0014] In some embodiments, the hydraulic control system further includes an excavation operation instruction receiving module, and the excavation operation instruction receiving module is used to receive an excavation operation instruction from an operator so that the excavation valve coupling assembly is energized to perform an excavation action.

[0015] In some embodiments, the hydraulic control system further comprises:

[0016] A multi-way valve, wherein the multi-way valve comprises a ballast discharge valve link, and the ballast discharge valve link is used to be connected to the ballast discharge power element of the cleaning power assembly through a ballast discharge oil circuit to control the opening and closing of the ballast discharge power element;

[0017] The third main pump is connected to the multi-way valve through a third oil supply channel, and is used to supply oil to the ballast discharge valve through the third oil supply channel to control the ballast discharge power element to perform ballast discharge action.

[0018] In some embodiments, the hydraulic control system further includes a ballast removal operation instruction receiving module, and the ballast removal operation instruction receiving module is used to receive a ballast removal operation instruction from an operator so that the ballast removal valve is electrically connected to perform a ballast removal action.

[0019] The present application also provides a screening machine, comprising any of the hydraulic control systems described above.

[0020] In some embodiments, the screening machine also includes an upper car assembly, an lower car assembly, a working arm and working accessories, the working accessories are detachably connected to the working arm, the working accessories are used to perform corresponding work, the upper car assembly is arranged on the lower car assembly, and the lower car assembly is used to carry the upper car assembly, the hydraulic control system and the working arm.

[0021] In some embodiments, the working attachment is specifically a screening attachment, a guide rail grinding attachment or a bucket.

[0022] Compared with the above background technology, the hydraulic control system provided in the embodiment of the present application is used to control the operation of the screening power assembly and the excavation power assembly, and the hydraulic control system includes a multi-control valve group, a first main pump, a second main pump and a cut-off valve. Among them, the multi-control valve group includes a ballast removal valve group and an excavation valve group assembly, the ballast removal valve group is used to control the opening and closing of the ballast removal power element of the screening power assembly, and the excavation valve group assembly is used to control the opening and closing of the excavation power assembly; the first main pump is connected to the ballast removal valve group through the first oil supply channel; the second main pump is connected to the excavation valve group assembly through the second oil supply channel; the cut-off valve is arranged at the confluence point of the first oil supply channel and the second oil supply channel, and the cut-off valve is used to control the connection and cut-off of the first oil supply channel and the second oil supply channel.

[0023] In this way, when the shut-off valve cuts off the first oil supply channel and the second oil supply channel, the first main pump supplies oil to the ballast valve assembly through the first oil supply channel, and the second main pump supplies oil to the excavation valve assembly through the second oil supply channel; when the shut-off valve connects the first oil supply channel and the second oil supply channel, the first main pump and the second main pump join together to supply oil to the excavation valve assembly.

[0024] The beneficial effects of the hydraulic control system thus configured mainly include:

[0025] On the one hand, a multifunctional integrated design is adopted: various engineering operation control functions such as screening and excavation are integrated into the same hydraulic system, meeting the needs of the hydraulic system for excavator working conditions and ballast cleaning conditions. On the other hand, the working conditions can be switched autonomously: when performing ballast removal operations, the shut-off valve is controlled to shut off the first oil supply channel and the second oil supply channel, and the first main pump supplies oil to the ballast removal valve assembly through the first oil supply channel to perform the ballast removal action, and the second main pump supplies oil to the excavation valve assembly through the second oil supply channel to realize excavator actions such as walking, rotation, boom, arm, bucket, etc. In this way, the corresponding actions controlled by the first main pump and the second main pump can be switched autonomously to realize independent control of the excavation adjustment action and the ballast removal operation action, fundamentally avoiding the flow rush phenomenon between ballast removal, ballast removal and whole machine walking during cleaning and screening work; when performing excavation operations, the shut-off valve is controlled to connect the first oil supply channel and the second oil supply channel, so that the first main pump and the second main pump merge to supply oil to the excavation valve assembly for the excavator's walking, rotation, boom, arm, bucket and other execution actions, thereby ensuring the flow and efficiency of the excavation working conditions.

[0026] In summary, the hydraulic control system provided in the embodiment of the present application solves the technical problems of low work efficiency, high energy consumption and potential safety hazards caused by the hydraulic system's flow grabbing, inability to remove ballast and many working failures during screening operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0028] FIG1 is a schematic diagram of a hydraulic control system in an embodiment of the present application;

[0029] FIG. 2 is a schematic diagram of the structure of a screen cleaning machine in an embodiment of the present application.

[0030] in:

[0031] 10-Hydraulic control system;

[0032] 11- first main pump;

[0033] 12- Second main pump;

[0034] 13- the third main pump;

[0035] 14-Multi-way valve;

[0036] 15-multiple control valve group, 151-ballast removal valve union, 152-left travel valve union, 153-right travel valve union, 154-slewing valve union, 155-boom valve union, 156-arm valve union, 157-bucket valve union, 158-crushing valve union, 159-two-arm valve union;

[0037] 16- cut-off valve;

[0038] 17-Pilot control valve;

[0039] 18- first oil supply channel;

[0040] 19- second oil supply channel;

[0041] 110 - third oil supply channel;

[0042] 111-ballasting power element;

[0043] 112-ballast removal power element;

[0044] 113-excavation power assembly, 1131-left travel power element, 1132-right travel power element, 1133-rotation power element, 1134-arm power element, 1135-arm power element, 1136-bucket power element, 1137-crushing power element, 1138-two-arm power element;

[0045] 20-on-vehicle assembly;

[0046] 30-get off assembly;

[0047] 40-working arm;

[0048] 50-Working accessories. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0050] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0051] It should be noted that the directional words such as "upper end, lower end, left side, right side" described below are all defined based on the drawings in the specification.

[0052] Please refer to Figures 1 and 2. Figure 1 is a schematic diagram of a hydraulic control system in an embodiment of the present application; Figure 2 is a schematic diagram of the structure of a screening machine in an embodiment of the present application.

[0053] The hydraulic control system 10 provided in the embodiment of the present application is applied to a screen cleaning machine, the screen cleaning work of which mainly includes ballast removal, ballast removal and tamping, etc., the purpose of which is to restore the elasticity of the roadbed and ensure the safety of the line. The hydraulic control system 10 is used to control the operation of the screen cleaning power assembly and the excavation power assembly 113.

[0054] Among them, the screening power assembly mainly includes a ballast removing power element 111 and a ballast discharging power element 112. The ballast removing power element 111 is specifically a ballast removing motor, which is used to provide power to perform the ballast removing action. The ballast discharging power element 112 is specifically a ballast discharging motor, which is used to provide power to perform the ballast discharging action.

[0055] The hydraulic control system 10 includes a multi-connection control valve group 15 (specifically a nine-connection multi-way valve), a first main pump 11, a second main pump 12 and a cut-off valve 16. The multi-connection control valve group 15 includes a ballast removal valve group 151 (specifically an electric proportional control / reversing valve) and an excavation valve group assembly. The ballast removal valve group 151 is used to be connected to the ballast removal power element 111 of the cleaning power assembly through a ballast removal oil circuit to control the opening and closing of the ballast removal power element 111. The excavation valve group assembly is connected to the excavation power assembly 113 through a corresponding excavation oil circuit to control the opening and closing of the excavation power assembly 113.

[0056] It should be noted that the excavator includes walking, rotating, boom, dipper, bucket and other execution actions. Specifically, the excavation power assembly 113 mainly includes a left walking power element 1131, a right walking power element 1132, a rotating power element 1133, an arm power element 1134, an arm power element 1135, a bucket power element 1136, a crushing power element 1137 and a second arm power element 1138. Correspondingly, the excavation valve coupling assembly includes a left walking valve coupling 152 for controlling the operation of the left walking power element 1131. , a right walking valve connection 153 for controlling the operation of the right walking power element 1132, a rotary valve connection 154 for controlling the operation of the rotary power element 1133, a boom valve connection 155 for controlling the operation of the boom power element 1134, an arm valve connection 156 for controlling the operation of the dipper arm power element 1135, a bucket valve connection 157 for controlling the operation of the bucket power element 1136, a crushing valve connection 158 for controlling the operation of the crushing power element 1137 and a two-arm valve connection 159 for controlling the operation of the two-arm power element 1138.

[0057] The first main pump 11 is connected to the ballast stripping valve link 151 via a first oil supply passage 18 . The first main pump 11 is used to supply oil to the ballast stripping valve link 151 via the first oil supply passage 18 to control the operation of the ballast stripping power element 111 .

[0058] The second main pump 12 is connected to the excavation valve assembly via a second oil supply passage 19 . The second main pump 12 is used to supply oil to the excavation valve assembly via the second oil supply passage 19 to control the operation of the excavation power assembly 113 .

[0059] The shut-off valve 16 is disposed at the confluence point of the first oil supply passage 18 and the second oil supply passage 19 , and the shut-off valve 16 is used to control the connection and shut-off of the first oil supply passage 18 and the second oil supply passage 19 .

[0060] In this way, when the shut-off valve 16 cuts off the first oil supply channel 18 and the second oil supply channel 19, the first main pump 11 supplies oil to the ballast removal valve assembly 151 through the first oil supply channel 18, and the second main pump 12 supplies oil to the excavation valve assembly through the second oil supply channel 19; when the shut-off valve 16 connects the first oil supply channel 18 and the second oil supply channel 19, the first main pump 11 and the second main pump 12 join together to supply oil to the excavation valve assembly.

[0061] On the one hand, a multifunctional integrated design is adopted: various engineering operation control functions such as screening and excavation are integrated into the same hydraulic system, meeting the needs of the hydraulic system for excavator working conditions and ballast cleaning conditions. On the other hand, the working condition actions can be switched autonomously: when performing ballast removal operations, the shut-off valve 16 is controlled to shut off the first oil supply channel 18 and the second oil supply channel 19, and the first main pump 11 supplies oil to the ballast removal valve link 151 through the first oil supply channel 18 to perform the ballast removal action, and the second main pump 12 supplies oil to the excavation valve link assembly through the second oil supply channel 19 to realize excavator actions such as walking, rotating, boom, dipper arm, bucket, etc., so that the corresponding actions controlled by the first main pump 11 and the second main pump 12 can be switched autonomously, and the excavation adjustment action and the ballast removal operation action can be independently controlled, which fundamentally avoids the flow rush phenomenon between ballast removal, ballast removal and whole machine walking during cleaning and screening work; when performing excavation operations, the shut-off valve 16 is controlled to connect the first oil supply channel 18 and the second oil supply channel 19, so that the first main pump 11 and the second main pump 12 merge into the excavation valve link assembly to supply oil to the excavator's walking, rotating, boom, dipper arm, bucket and other execution actions, thereby ensuring the flow and efficiency of the excavation working condition.

[0062] In summary, the hydraulic control system 10 provided in the embodiment of the present application solves the technical problems of low working efficiency, high energy consumption and potential safety hazards caused by the hydraulic system's flow grabbing, inability to remove ballast and many working failures during screening operations.

[0063] In addition, the hydraulic control system 10 further includes a multi-way valve 14 and a third main pump 13 .

[0064] Among them, the multi-way valve 14 includes a ballast discharge valve unit, which is used to connect with the ballast discharge power element 112 of the screening power assembly through the ballast discharge oil circuit to control the opening and closing of the ballast discharge power element 112; the third main pump 13 is connected to the multi-way valve 14 through the third oil supply channel 110, which is used to supply oil to the ballast discharge valve unit through the third oil supply channel 110 to control the ballast discharge power element 112 to perform the ballast discharge action.

[0065] In some embodiments, the hydraulic control system 10 further includes a pilot control valve 17 , which is connected to the cut-off valve 16 via a pilot oil circuit. The pilot control valve 17 is used to provide pilot pressure oil to the cut-off valve 16 to control the operation of the cut-off valve 16 .

[0066] In this embodiment, the pilot control valve 17 is a solenoid valve, which is configured to control the cut-off valve 16 to cut off the first oil supply channel 18 and the second oil supply channel 19 when energized, and to control the cut-off valve 16 to connect the first oil supply channel 18 and the second oil supply channel 19 when de-energized.

[0067] The following is a detailed description of the control principles under ballast removal, ballast removal and excavation conditions:

[0068] When performing ballast milling / ballast unloading operations:

[0069] The solenoid valve is energized to provide pilot pressure oil to control the action of the cut-off valve 16, thereby cutting off the connection channel between the first main pump 11 and the second main pump 12, that is, cutting off the first oil supply channel 18 and the second oil supply channel 19. As a result, the first main pump 11 supplies oil to the ballast removal valve link 151 through the first oil supply channel 18 to control the ballast removal action, and the second main pump 12 supplies oil to the walking, rotation, boom, dipper arm, bucket and other excavator actions through the second oil supply channel 19.

[0070] When the ballast discharge valve link of the multi-way valve 14 (specifically, a triple multi-way valve) is working, the third main pump 13 supplies oil to the ballast discharge valve link through the third oil supply channel 110 to control the ballast discharge power element 112 to perform ballast discharge action.

[0071] That is to say, when the ballast removal valve 151 works, it sends a signal to the cut-off valve 16 to cut off the connection between the first main pump 11 and the second main pump 12, so that the first main pump 11 supplies oil to the ballast removal action, and the second main pump 12 supplies oil to the excavation adjustment actions such as walking, rotation, boom, dipper, two arms and bucket, so as to achieve the purpose that the adjustment actions such as ballast removal and walking do not interfere with each other. When the ballast removal valve of the multi-way valve 14 works, the load sensing system immediately feeds back the hydraulic oil of the corresponding flow and pressure output by the third main pump 13 and supplies it to the ballast removal valve to control the ballast removal power element 112 to perform the ballast removal action.

[0072] When only excavator operation is performed:

[0073] The solenoid valve works when power is off, and the control cut-off valve 16 is reset under the action of spring force, connecting the first oil supply channel 18 and the second oil supply channel 19, so that the first main pump 11 and the second main pump 12 merge to supply oil to the excavator's walking, rotation, boom, dipper arm, bucket and other execution actions, ensuring the efficient excavation of the excavator.

[0074] The multi-way valve 14 is not working, and the third main pump 13 is at low pressure and small flow, so the power of the equipment is not wasted.

[0075] That is to say, since the ballast removal valve coupler 151 and the cut-off valve 16 are not working, the first main pump 11 and the second main pump 12 merge to supply oil to the excavator's walking, rotation, boom, dipper arm, bucket and other execution actions, ensuring the efficient excavation of the excavator. At the same time, the ballast removal valve coupler of the multi-way valve 14 is not working, and the third main pump 13 is at low pressure and small flow, so as not to waste equipment power.

[0076] In some embodiments, the hydraulic control system 10 further includes a ballast-removing operation instruction receiving module, which is used to receive a ballast-removing operation instruction from an operator so as to energize the ballast-removing valve link 151 and the pilot control valve 17 to perform the ballast-removing action.

[0077] In some embodiments, the hydraulic control system 10 further includes a ballast discharge operation instruction receiving module, which is used to receive a ballast discharge operation instruction from an operator so as to electrically connect the ballast discharge valve to perform a ballast discharge action.

[0078] Of course, according to actual needs, the above-mentioned ballast removing operation instruction receiving module can be a ballast removing switch, and the ballast discharging operation instruction receiving module can be a ballast discharging switch. The ballast removing switch is operated by the operator to energize the ballast discharging valve link 151 and the pilot control valve 17 to perform the ballast removing action. The ballast discharging switch is operated by the operator to energize the ballast discharging valve link to perform the ballast discharging action.

[0079] In some embodiments, the hydraulic control system 10 further includes an excavation operation instruction receiving module, which is used to receive an excavation operation instruction from an operator so as to energize the excavation valve assembly and perform an excavation action.

[0080] Of course, according to actual needs, the excavation operation instruction receiving module can be an excavation operation handle arranged in the control room, so that the excavation operation handle is used to transmit the corresponding excavation action instructions, thereby executing the excavation action.

[0081] In summary, the hydraulic control system 10 of the present application can bring the following beneficial effects:

[0082] Firstly, it adopts a multifunctional integrated design: various engineering operation control functions such as screening and excavation are integrated into the same hydraulic system, meeting the requirements of the hydraulic system for excavator working conditions and ballast cleaning working conditions.

[0083] Secondly, the working conditions can be switched autonomously: when ballast removal operation is being performed, the shut-off valve 16 is controlled to shut off the first oil supply channel 18 and the second oil supply channel 19, so as to realize independent control of the excavation adjustment action and the ballast removal operation action, fundamentally avoiding the flow competition phenomenon between ballast removal, ballast removal and the movement of the whole machine during cleaning and screening; when excavation operation is being performed, the shut-off valve 16 is controlled to connect the first oil supply channel 18 and the second oil supply channel 19, so that the first main pump 11 and the second main pump 12 merge into the excavation valve coupling assembly to supply oil to the excavator's movement, rotation, boom, dipper arm, bucket and other execution actions, thereby ensuring the flow and efficiency of the excavation working condition.

[0084] Third, the hydraulic distribution multi-way valve 14 is integrated in design: the integrated ballast removal valve union 151 and each excavation valve in the excavation valve union assembly are connected to an integrated multi-way valve to form a nine-way multi-way valve, and a hydraulic pilot is used to control the on and off of the cut-off valve 16, with high integration and reliability.

[0085] The present application provides a screening machine, which includes the hydraulic control system 10 described in the above specific embodiment.

[0086] In some embodiments, the screening machine also includes an upper vehicle assembly 20, an lower vehicle assembly 30, a working arm 40 and a working tool 50. The working tool 50 is detachably connected to the working arm 40. The working tool 50 is used to perform corresponding work. The upper vehicle assembly 20 is arranged on the lower vehicle assembly 30. The upper vehicle assembly 20 includes a multi-pump fluid supply system, a high-power power system, an independent cooling system, a safe driving cab, etc. The lower vehicle assembly 30 includes a track chassis system, a slewing limit system, etc. The lower vehicle assembly 30 is used to carry the upper vehicle assembly 20, the hydraulic control system 10 and the working arm 40.

[0087] In some embodiments, the working attachment 50 is specifically a screening attachment, a guide rail grinding attachment or a bucket.

[0088] In this way, when the working arm 40 is equipped with cleaning accessories, ballast stripping, ballast removal and cleaning operations can be realized; when the working arm 40 is equipped with guide rail grinding accessories, the grinding and shaping of worn guide rails can be realized; when the working arm 40 is equipped with a bucket, the excavator function of the screening machine can be realized.

[0089] To summarize, the present application integrates the functions of guide rail ballast cleaning, guide rail grinding and excavation, is equipped with a high-power engine and a multi-pump system, and adopts a compact layout with a short tail and a narrow platform. The whole machine can not only perform the functions of sleeper replacement, cleaning and guide rail grinding for railway maintenance in normal railway sections, but also perform railway maintenance work in bridge and tunnel sections, realizing multi-functionality of one machine, improving construction efficiency, enhancing economic benefits and ensuring operation safety.

[0090] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0091] The hydraulic control system and the screen cleaning machine provided by the present application are introduced in detail above. The principles and implementation methods of the present application are described in this article using specific examples. The description of the above embodiments is only used to help understand the scheme and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the present application.

Claims

1. A hydraulic control system for controlling the operation of a cleaning power assembly and an excavation power assembly, characterized in that: include: A multi-valve control group, the multi-valve control group includes a ballast removal valve group and an excavation valve group assembly, the ballast removal valve group is used to control the opening and closing of the ballast removal power element of the screening power assembly, and the excavation valve group assembly is used to control the opening and closing of the excavation power assembly; A first main pump is connected to the ballast removal valve via a first oil supply channel; a second main pump connected to the excavation valve coupling assembly via a second oil supply passage; A cut-off valve, provided at a confluence point of the first oil supply passage and the second oil supply passage, for controlling the connection and cut-off of the first oil supply passage and the second oil supply passage; Among them, when the cut-off valve cuts off the first oil supply channel and the second oil supply channel, the first main pump supplies oil to the ballast removal valve assembly through the first oil supply channel, and the second main pump supplies oil to the excavation valve assembly through the second oil supply channel; when the cut-off valve connects the first oil supply channel and the second oil supply channel, the first main pump and the second main pump join together to supply oil to the excavation valve assembly.

2. The hydraulic control system according to claim 1, characterized in that: The hydraulic control system further comprises a pilot control valve, which is connected to the cut-off valve via a pilot oil circuit, and is used to provide pilot pressure oil to the cut-off valve to control the action of the cut-off valve.

3. The hydraulic control system according to claim 2, characterized in that: The pilot control valve is a solenoid valve, which is configured to control the cut-off valve to cut off the first oil supply passage and the second oil supply passage when powered, and to control the cut-off valve to connect the first oil supply passage and the second oil supply passage when powered off.

4. The hydraulic control system according to claim 3, characterized in that: The hydraulic control system further comprises a ballast-removing operation instruction receiving module, which is used to receive a ballast-removing operation instruction from an operator, so that the ballast-removing valve link and the pilot control valve are energized to operate and perform the ballast-removing action.

5. The hydraulic control system according to claim 1, characterized in that: The hydraulic control system further comprises an excavation operation instruction receiving module, wherein the excavation operation instruction receiving module is used to receive an excavation operation instruction from an operator so as to energize the excavation valve coupling assembly to perform an excavation action.

6. The hydraulic control system according to claim 1, characterized in that: The hydraulic control system further comprises: A multi-way valve, wherein the multi-way valve comprises a ballast discharge valve link, and the ballast discharge valve link is used to be connected with the ballast discharge power element of the cleaning power assembly through a ballast discharge oil circuit to control the opening and closing of the ballast discharge power element; The third main pump is connected to the multi-way valve through a third oil supply channel, and is used to supply oil to the ballast discharge valve joint through the third oil supply channel to control the ballast discharge power element to perform ballast discharge action.

7. The hydraulic control system according to claim 6, characterized in that: The hydraulic control system further comprises a ballast discharge operation instruction receiving module, and the ballast discharge operation instruction receiving module is used to receive a ballast discharge operation instruction from an operator so as to enable the ballast discharge valve to be electrically connected and operate to perform a ballast discharge action.

8. A cleaning machine, characterized in that: Comprising a hydraulic control system as described in any one of claims 1-7.

9. The cleaning machine according to claim 8, characterized in that: The screening machine also includes an upper car assembly, an lower car assembly, a working arm and working accessories. The working accessories are detachably connected to the working arm and are used to perform corresponding work. The upper car assembly is arranged on the lower car assembly, and the lower car assembly is used to carry the upper car assembly, the hydraulic control system and the working arm.

10. The cleaning machine according to claim 9, characterized in that: The working accessories are specifically screening accessories, guide rail grinding accessories or buckets.

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