Novel hydraulic control system of household garbage dry-wet classification equipment

Abstract

The utility model discloses a novel hydraulic control system of household garbage dry-wet classification equipment, and belongs to the field of hydraulic control. The hydraulic control system comprises a large variable pump connected and driven by a first motor, a small variable pump connected and driven by a second motor, a duplex vane pump connected and driven by a third motor, a cooling circulating pump connected and driven by a fourth motor, a pressure control valve group, an extrusion roller feeding control valve group, a cooperative control valve group, an extrusion oil cylinder and a low-speed large-torque hydraulic motor; the device comprises a feeding oil cylinder, a door blocking oil cylinder, a door lifting oil cylinder, a push-pull box oil cylinder, a box locking oil cylinder, an oil return filter, a circulating filter, an air cooler and an oil tank. According to the utility model, the multifunctional control variable pump with constant power and remote constant-pressure control is adopted, so that the device is suitable for the extrusion working condition of household garbage dry-wet classification equipment, the working efficiency is higher, and small-load high speed and large-load low speed are easier to realize; and the system is more energy-saving and smaller in heat generation.

Description

Technical Field

[0001] This utility model belongs to the technical field of dry and wet sorting equipment for municipal solid waste treatment, and specifically relates to a new hydraulic control system for dry and wet sorting equipment for municipal solid waste. Background Technology

[0002] With the implementation of the waste sorting system, waste can be broadly classified into four categories: recyclable waste, dry waste, wet waste, and hazardous waste. Achieving waste sorting and treatment is not only a crucial indicator of modern urban waste management modernization but also a fundamental means of waste resource recovery. Accelerating the application of dry and wet waste sorting technology involves using this technology to separate household waste through dry and wet compression. The resulting dry waste has a low moisture content and high calorific value, and the volume of sorted dry waste is reduced, decreasing the amount of waste sent to incinerators or landfills, thus saving energy, protecting the environment, and reducing carbon emissions. The wet waste, after dry and wet sorting, has a high moisture content and high organic matter content. The organic matter can be co-processed into organic fertilizer at low-temperature wet-heat coal chemical treatment terminals or anaerobic fermentation treatment centers, while wastewater can be discharged after simple treatment.

[0003] The existing hydraulic control system for dry and wet waste sorting equipment mainly has the following two control directions:

[0004] The system employs control components including a variable speed motor, a metering pump, and a pressure transmitter. The pressure signal from the pressure transmitter controls the drive speed of the variable speed motor and adjusts the output flow of the metering pump to meet the process requirements of small-load, fast, and large-load, slow waste compression.

[0005] It adopts control components including a constant speed motor, a constant power variable pump, and a large flow overflow valve. Through the automatic variable mechanism of the constant power variable pump, the output flow of the variable pump is adjusted by constant power under high load and high pressure, and the system is automatically limited to prevent over-power operation. When the pump outputs excess flow oil during high load pressure holding and micro-speed extrusion, the excess flow oil is overflowed back to the oil tank by the large flow overflow valve.

[0006] In the process of implementation, the inventors discovered that the existing technology has at least the following problems:

[0007] The flow rate is controlled by a variable speed motor, which makes the control system complex and the components expensive. During the high-load slow extrusion process, the motor runs at low speed for a long time, which causes the motor to heat up a lot. When the motor speed is lower than the stable minimum speed of the metering pump, the oil supply of the metering pump fluctuates greatly, resulting in high system vibration and noise and unstable pressure.

[0008] When the hydraulic oil consumption of a constant power variable pump during low-speed, high-pressure compression is less than the output flow of the constant power pump, the excess hydraulic oil will overflow back to the oil tank through the relief valve. The hydraulic oil will generate a lot of heat when it overflows through the relief valve, resulting in energy waste and reduced efficiency of the hydraulic system. At the same time, the heat generated by the overflow will raise the oil temperature of the hydraulic system, which will have an adverse effect on the operation of the hydraulic system. Utility Model Content

[0009] To address the problems of existing technologies, this utility model provides a novel hydraulic control system for a dry and wet sorting device for municipal solid waste, which solves the technical problems of complex extrusion process control, high energy loss, low energy efficiency, and high noise in existing systems.

[0010] The technical solution is as follows:

[0011] This utility model provides a novel hydraulic control system for a dry and wet waste sorting device. The hydraulic control system includes: a large variable displacement pump driven by a first motor, a small variable displacement pump driven by a second motor, a double vane pump driven by a third motor, a cooling circulation pump driven by a fourth motor, a pressure control valve group, a pressing roller feeding control valve group, a coordination control valve group, a pressing cylinder, a low-speed, high-torque hydraulic motor, a feeding cylinder, a gate blocking cylinder, a gate lifting cylinder, a push-pull box cylinder, a box locking cylinder, a return oil filter, a circulation filter, an air cooler, and an oil tank.

[0012] The large variable pump is connected and driven by the first motor, and is inserted into the oil tank from the top of the oil tank to draw oil through the suction pipe;

[0013] The small variable pump is driven by a second motor and is inserted into the oil tank from the top of the oil tank to draw oil through the suction pipe.

[0014] The double vane pump is driven by a third motor and is inserted into the oil tank from the top of the oil tank, drawing oil through the suction pipe.

[0015] The cooling circulation pump is driven by a fourth motor and is inserted into the oil tank from the top surface of the oil tank, drawing oil through the suction pipe; the output end of the cooling circulation pump cools the hydraulic oil through the air cooler and then flows back to the oil tank through the circulation filter.

[0016] The input terminals of the pressure control valve assembly are respectively connected to the output terminals of the large variable pump, the small variable pump, and the double vane pump.

[0017] The input end of the extrusion roller feeding control valve group is connected to the output end of the pressure control valve group, and the output end is hydraulically connected to the extrusion cylinder, the low-speed high-torque hydraulic motor, the feeding cylinder and the return oil filter on the oil tank, respectively.

[0018] The input end of the coordinated control valve group is connected to the output end of the pressure control valve group, and the output end is hydraulically connected to the gate cylinder, the lifting cylinder, the push-pull box cylinder, the lock box cylinder, and the return oil filter on the oil tank.

[0019] Furthermore, the large variable pump and the small variable pump are multifunctional variable piston pumps with constant power control and remote constant pressure control.

[0020] Furthermore, the pressure control valve assembly used for extrusion and roller oil supply has three pressure settings: pressure relief, low pressure, and high pressure.

[0021] Furthermore, the extrusion roller feeding control valve group is used for the combined flow control of a proportional valve with a small flow rate and a switching valve with a large flow rate for supplying oil to the extrusion cylinder.

[0022] This utility model provides a novel hydraulic control system for a household waste dry and wet sorting device, comprising the following steps:

[0023] Obtain the squeeze start signal;

[0024] The first motor drives the large variable pump and the second motor drives the small variable pump to pressurize the oil, which together supply oil to the rodless chamber of the extrusion cylinder. The cylinder rod of the extrusion cylinder is quickly extended by the extrusion electro-hydraulic reversing valve, which drives the extrusion push head device to quickly extend under a small load to press the material.

[0025] When the extrusion pusher device extends rapidly under a small load to press the material, and the actual working pressure of the hydraulic system reaches the constant power variable point of the variable pump, the constant power variable mechanism of the large variable pump and the small variable pump is automatically triggered. As the pressure increases, the large variable pump and the small variable pump automatically reduce the displacement and maintain the combined output under constant power to drive the extrusion pusher device to achieve large load slow pressing.

[0026] When the extrusion pusher device applies a heavy load and applies slow material, causing the actual working pressure of the hydraulic system to reach the remote constant pressure variable control set value of the variable pump, i.e. the pressure holding and strong extrusion point, the large variable pump driven by the first motor depressurizes, and only the small variable pump driven by the second motor continues to pressurize. The remote constant pressure variable mechanism of the small variable pump is automatically triggered and takes priority over its constant power variable mechanism control. The displacement of the small variable pump is automatically further reduced to provide the oil output required to maintain the internal leakage of the system and the pressure holding and slow extension of the extrusion cylinder, thereby driving the extrusion pusher device to achieve pressure holding and strong extrusion and wet separation.

[0027] When the actual time for holding pressure and squeezing separation reaches the set time, the squeezing cylinder extends and the squeezing ends. The first motor drives the large variable pump and the second motor drives the small variable pump to work at low pressure at the same time, jointly supplying low-pressure limited oil to the rod chamber of the squeezing cylinder. The squeezing electro-hydraulic reversing valve, the squeezing proportional solenoid reversing valve, and the hydraulic control check valve jointly control the cylinder rod of the squeezing cylinder to retract quickly, driving the squeezing push head device to retract quickly.

[0028] When the actual stroke of the extrusion pusher is about to reach the cyclic retraction position of the extrusion pusher, the large variable pump driven by the first motor depressurizes, and only the small variable pump driven by the second motor continues to pressurize at low pressure. The extrusion electro-hydraulic reversing valve is closed, and the extrusion cylinder is slowly retracted by the proportional control of the extrusion proportional solenoid reversing valve, so as to drive the extrusion pusher to slowly retract.

[0029] The extrusion cycle ends when the actual stroke of the extrusion cylinder reaches the retraction position of the extrusion pusher device.

[0030] This utility model has the following beneficial effects:

[0031] The extrusion cycle control logic of the hydraulic control system for the dry and wet sorting equipment provided by this utility model is a constant power and constant pressure adaptive speed-regulating hydraulic system. Based on the adaptive control of the current working pressure of the hydraulic system, constant power operation and constant pressure adaptive flow output are realized, making the system more efficient and easier to meet the process requirements of high speed under small load and low speed under large load. The constant power and constant pressure control is more energy-efficient, the system heats up less, and the control and operation are simple. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the hydraulic system of a preferred embodiment of the present invention.

[0034] Figure 2 This is a schematic diagram of the pressure control valve assembly according to a preferred embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of the extrusion roller feeding control valve group of a preferred embodiment of the present invention. Detailed Implementation

[0036] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0037] A novel hydraulic control system for a dry and wet sorting device for municipal solid waste is characterized in that the hydraulic control system comprises: a large variable pump (3) driven by a first motor (2), a small variable pump (5) driven by a second motor (4), a double vane pump (7) driven by a third motor (6), a cooling circulation pump (10) driven by a fourth motor (9), a pressure control valve group (13), a pressing roller feeding control valve group (14), a coordination control valve group (15), a pressing cylinder (17), a low-speed high-torque hydraulic motor (16), a feeding cylinder (18), a gate blocking cylinder (19), a gate lifting cylinder (20), a push-pull box cylinder (21), a box locking cylinder (22), a return oil filter (8), a circulation filter (11), an air cooler (12), and an oil tank (1).

[0038] The large variable pump (3) is connected and driven by the first motor (2), and is inserted into the oil tank (1) from the top surface of the oil tank (1) to draw oil through the suction pipe;

[0039] The small variable pump (5) is connected and driven by the second motor (4), and is inserted into the oil tank (1) from the top surface of the oil tank (1) to draw oil through the suction pipe;

[0040] The double vane pump (7) is connected and driven by a third motor (6), and is inserted into the oil tank (1) from the top surface of the oil tank (1) to suck oil through the suction pipe;

[0041] The cooling circulation pump (10) is connected and driven by the fourth motor (9), and is inserted into the oil tank (1) from the top surface of the oil tank (1) to draw oil through the suction pipe; the output end of the cooling circulation pump (10) cools the hydraulic oil through the air cooler (12) and then flows back to the oil tank (1) through the circulation filter (11).

[0042] The input port P1 of the pressure control valve group (13) is connected to the output port B of the large variable pump (3), and the input port X1 is connected to the remote pressure regulating port X of the output port of the large variable pump (3); the input port P2 of the pressure control valve group (13) is connected to the output port B of the small variable pump (5), and the input port X2 is connected to the remote pressure regulating port X of the output port of the small variable pump (5); the input port P3 of the pressure control valve group (13) is connected to the output port of the large vane pump in the double vane pump (7); the input port P4 of the pressure control valve group (13) is connected to the output port of the small vane pump in the double vane pump (7); the return oil port T1 of the output port of the pressure control valve group (13) is hydraulically connected to the return oil filter (8) on the oil tank (1); the output port L1 of the pressure control valve group (13) is hydraulically connected to the oil tank (1).

[0043] The input port PJ of the extrusion roller feeding control valve group (14) is connected to the output port PA of the pressure control valve group (13); the input port PS of the extrusion roller feeding control valve group (14) is connected to the output port PB of the pressure control valve group (13); the return oil port T2 of the output end of the extrusion roller feeding control valve group (14) is hydraulically connected to the return oil filter (8) on the oil tank (1) for oil return; the working oil port of the output end of the extrusion roller feeding control valve group (14) is hydraulically connected to the extrusion cylinder (17), the low-speed high-torque hydraulic motor (16), and the feeding cylinder (18) respectively.

[0044] The input port PF of the coordinated control valve group (15) is hydraulically connected to the output port PB of the pressure control valve group (13); the return oil port T3 of the output port of the coordinated control valve group (15) is hydraulically connected to the return oil filter (8) on the oil tank (1) for return oil; the working oil port of the output port of the coordinated control valve group (15) is hydraulically connected to the gate cylinder (19), the door lifting cylinder (20), the push-pull box cylinder (21), and the lock box cylinder (22) respectively.

[0045] Specifically, the large variable pump (3) is a multi-functional variable piston pump with constant power control and remote constant pressure control; the small variable pump (5) is a multi-functional variable piston pump with constant power control and remote constant pressure control.

[0046] Specifically, the pressure control valve group (13) includes: a large variable pump check valve (33), a large variable pump pressure transmitter (32), a large variable pump pressure relief solenoid valve (34), a large variable pump low-pressure solenoid valve (31), a large variable pump low-pressure regulating valve (35), a large variable pump high-pressure regulating valve (30), a small variable pump check valve (36), a small variable pump pressure transmitter (29), a small variable pump pressure relief solenoid valve (37), a small variable pump low-pressure solenoid valve (28), a small variable pump low-pressure regulating valve (38), a small variable pump high-pressure regulating valve (27), a variable pump safety relief valve (39), a large blade pump check valve (40), a large blade pump solenoid relief valve (24), a large blade pump pressure transmitter (26), a small blade pump check valve (41), a small blade pump solenoid relief valve (23), and a small blade pump pressure transmitter (25).

[0047] Specifically, the input ends of the large variable pump check valve (33) and the large variable pump pressure transmitter (32) are connected to the valve group P1 port through the oil circuit of the pressure control valve group (13), and the output end of the large variable pump check valve (33) is connected to the valve group PA port through the oil circuit of the pressure control valve group (13).

[0048] Specifically, the input ends of the large variable pump pressure relief solenoid valve (34), the large variable pump low pressure solenoid valve (31), and the large variable pump high pressure regulating valve (30) are connected to the valve group X1 port through the oil circuit of the pressure control valve group (13); the output end of the large variable pump low pressure solenoid valve (31) is connected to the input end of the large variable pump low pressure regulating valve (35); the output ends of the large variable pump pressure relief solenoid valve (34), the large variable pump low pressure regulating valve (35), and the large variable pump high pressure regulating valve (30) are connected to the valve group L1 port through the oil circuit of the pressure control valve group (13).

[0049] Specifically, the input ends of the small variable pump check valve (36) and the small variable pump pressure transmitter (29) are connected to the P2 port of the pressure control valve group (13) through the oil circuit, and the output end of the small variable pump check valve (36) is connected to the PA port of the pressure control valve group (13) through the oil circuit.

[0050] Specifically, the input ends of the small variable pump pressure relief solenoid valve (37), the small variable pump low-pressure solenoid valve (28), and the small variable pump high-pressure regulating valve (27) are connected to the X2 port of the pressure control valve group (13) through the oil circuit; the output end of the small variable pump low-pressure solenoid valve (28) is connected to the input end of the small variable pump low-pressure regulating valve (38); the output ends of the small variable pump pressure relief solenoid valve (37), the small variable pump low-pressure regulating valve (38), and the small variable pump high-pressure regulating valve (27) are connected to the L1 port of the pressure control valve group (13) through the oil circuit.

[0051] Specifically, the input end of the variable pump safety relief valve (39) is connected to the output ends of the large variable pump check valve (33) and the small variable pump check valve (36); the output end of the variable pump safety relief valve (39) is connected to the T1 port of the pressure control valve group (13) through the oil circuit.

[0052] Specifically, the input ends of the large blade pump electromagnetic relief valve (24), the large blade pump check valve (40), and the large blade pump pressure transmitter (26) are connected to the P3 port of the pressure control valve group (13) through the oil circuit; the output end of the large blade pump check valve (40) is connected to the PB port of the pressure control valve group (13) through the oil circuit; and the output end of the large blade pump electromagnetic relief valve (24) is connected to the return oil T1 port of the pressure control valve group (13) through the oil circuit.

[0053] Specifically, the input terminals of the small vane pump solenoid relief valve (23), the small vane pump check valve (41), and the small vane pump pressure transmitter (25) are connected to the P4 port of the pressure control valve group (13) through the oil circuit; the output terminal of the small vane pump check valve (41) is connected to the PB port of the pressure control valve group (13) through the oil circuit; and the output terminal of the small vane pump solenoid relief valve (23) is connected to the return oil T1 port of the pressure control valve group (13) through the oil circuit.

[0054] Specifically, the extrusion roller feeding control valve group (14) includes: roller electro-hydraulic reversing valve (42), extrusion proportional solenoid reversing valve (43), extrusion electro-hydraulic reversing valve (44), pilot solenoid reversing valve (45), hydraulic control check valve (47), and feeding electro-hydraulic reversing valve (46).

[0055] Specifically, the input ends of the roller electro-hydraulic directional valve (42), the extrusion proportional solenoid directional valve (43), the extrusion electro-hydraulic directional valve (44), and the pilot solenoid directional valve (45) are connected to the PJ port of the extrusion roller feeding control valve group (14) through the oil circuit; the input end of the feeding electro-hydraulic directional valve (46) is connected to the PS port of the extrusion roller feeding control valve group (14) through the oil circuit.

[0056] Specifically, the return oil ends of the roller electro-hydraulic reversing valve (42), the extrusion ratio electromagnetic reversing valve (43), the extrusion electro-hydraulic reversing valve (44), the hydraulic control check valve (47), and the feeding electro-hydraulic reversing valve (46) are connected to the valve group T2 port through the oil circuit of the extrusion roller feeding control valve group (14).

[0057] Specifically, the pilot port of the hydraulic control check valve (47) is connected to the output end of the pilot solenoid directional valve (45), and the oil drain port of the hydraulic control check valve (47) and the oil return port of the pilot solenoid directional valve (45) are connected to the L2 port of the extrusion roller feeding control valve group (14) through the oil circuit.

[0058] Specifically, the two output ends of the roller electro-hydraulic reversing valve (42) are connected to the input port of the low-speed high-torque hydraulic motor (16) through the oil circuit A1 and B1 ports of the extrusion roller feeding control valve group (14);

[0059] Specifically, one output end of the extrusion proportional electromagnetic reversing valve (43) and the extrusion electro-hydraulic reversing valve (44) is connected to the rod chamber of the extrusion cylinder (17) through the oil circuit confluence port A2 of the extrusion roller feeding control valve group (14); the other output end of the extrusion proportional electromagnetic reversing valve (43), the extrusion electro-hydraulic reversing valve (44) and the hydraulic control check valve (47) is connected to the rodless chamber of the extrusion cylinder (17) through the oil circuit confluence port B2 of the extrusion roller feeding control valve group (14);

[0060] Specifically, one output end of the feeding electro-hydraulic reversing valve (46) is connected to the rod chamber of the feeding cylinder (18) through the oil circuit A3 port of the extrusion roller feeding control valve group (14); the other output end of the feeding electro-hydraulic reversing valve (46) is connected to the rodless chamber of the feeding cylinder (18) through the oil circuit B3 port of the extrusion roller feeding control valve group (14).

[0061] Specifically, the oil drain port of the low-speed high-torque hydraulic motor (16) and the L2 port of the extrusion roller feeding control valve group (14), as well as the L1 port of the pressure control valve group (13), are connected to the oil tank (1) through a pipeline with low back pressure.

[0062] The two variable pumps provided in the above embodiment drive the extrusion cylinder (17) and the low-speed, high-torque hydraulic motor (16) of the roller respectively through the pressure control valve group (13) and the extrusion roller feeding control valve group (14), thereby realizing the extrusion and retraction of the extrusion push head device, as well as the forward and reverse rotation of the bag breaking roller; the double vane pump drives the feeding cylinder (18) to feed and retract through the pressure control valve group (13) and the extrusion roller feeding control valve group (14), and drives the gate cylinder (19), the lifting cylinder (20), the push-pull box cylinder (21), and the locking cylinder (22) through the coordination control valve group (15), thereby realizing the opening and closing of the equipment extrusion chamber gate, as well as the lifting and lowering of the transfer box docked with the equipment, the box body pushing and pulling, the box body locking and loosening; the cooling circulation pump provides stable circulating oil for the air cooler (12) to achieve stable cooling effect.

[0063] The pressure control valve assembly (13) consists of a large variable pump pressure relief solenoid valve (34), a large variable pump low-pressure solenoid valve (31), a large variable pump low-pressure regulating valve (35), and a large variable pump high-pressure regulating valve (30), which together achieve the three operating pressures of the large variable pump: pressure relief, low pressure, and high pressure. The small variable pump pressure relief solenoid valve (37), small variable pump low-pressure solenoid valve (28), small variable pump low-pressure regulating valve (38), and small variable pump high-pressure regulating valve (27) together achieve the three operating pressures of the small variable pump: pressure relief, low pressure, and high pressure. The large variable pump check valve (33) and the small variable pump check valve (36) cut off the pressure interference between the large variable pump (3) and the small variable pump (5), enabling independent or combined operation of the oil pumps. The variable pump safety relief valve (39) achieves pressure... Force redundancy protection ensures that the system pressure does not exceed the operating pressure; among them, the large blade pump electromagnetic relief valve (24) realizes the pressurization and depressurization of the large blade pump in the double blade pump (7); among them, the small blade pump electromagnetic relief valve (23) realizes the pressurization and depressurization of the small blade pump in the double blade pump (7); among them, the large blade pump check valve (40) and the small blade pump check valve (41) cut off the pressure interference between the large blade pump and the small blade pump in the double blade pump (7) to realize the independent or combined operation of the oil pump; among them, the large variable pump pressure transmitter (32), the small variable pump pressure transmitter (29), the large blade pump pressure transmitter (26), and the small blade pump pressure transmitter (25) realize the detection of the real-time operating pressure of each pump and feed the pressure signal back to the electrical control system, so that the electrical control system realizes the automatic control of the equipment.

[0064] The coordinated control valve group (15) mainly consists of an electromagnetic directional valve, a hydraulic lock, and a one-way throttle valve. The electromagnetic directional valve enables the switching action of each coordinated action cylinder, the hydraulic lock enables the locking of the coordinated action cylinder, and the one-way throttle valve enables the adjustment of the action speed of the coordinated action cylinder. When electromagnet YV16 is energized, the PF port of the coordinated control valve group (15) is connected to the B4 port, and the T3 port is connected to the A4 port. When electromagnet YV17 is energized, the PF port of the coordinated control valve group (15) is connected to the A4 port, and the T3 port is connected to the B4 port. When electromagnet YV18 is energized, the PF port of the coordinated control valve group (15) is connected to the B5 port, and the T3 port is connected to the A5 port. When electromagnet YV19 is energized, the PF port of the coordinated control valve group (15) is connected to the A5 port, and the T3 port is connected to the B5 port; when electromagnet YV20 is energized, the PF port of the coordinated control valve group (15) is connected to the B6 port, and the T3 port is connected to the A6 port; when electromagnet YV21 is energized, the PF port of the coordinated control valve group (15) is connected to the A6 port, and the T3 port is connected to the B6 port; when electromagnet YV22 is energized, the PF port of the coordinated control valve group (15) is connected to the B7 port, and the T3 port is connected to the A7 port; when electromagnet YV23 is energized, the PF port of the coordinated control valve group (15) is connected to the A7 port, and the T3 port is connected to the B7 port.

[0065] The extrusion roller feeding control valve group (14) mainly consists of an electro-hydraulic directional valve, a proportional solenoid directional valve, a solenoid directional valve, and a hydraulic control check valve. A large-diameter three-position four-way electro-hydraulic directional valve is used to realize the directional action of the low-speed, high-torque hydraulic motor of the bag-breaking roller. A large-diameter three-position four-way electro-hydraulic directional valve is used to realize the directional action of the feeding cylinder. A small-diameter three-position four-way proportional solenoid directional valve and a large-diameter three-position four-way electro-hydraulic directional valve are used for combined flow control to realize the fast and slow directional actions of the extrusion cylinder. Since the return oil flow from the rodless chamber is large when the extrusion cylinder retracts, a large-diameter hydraulic control check valve, piloted by a two-position three-way solenoid directional valve, is used to divert the return oil from the rodless chamber when the extrusion cylinder retracts, reducing the return oil pressure loss. When the electromagnet YV7 is energized, the extrusion roller feeding control... The PJ port of valve group (14) is connected to the B1 port, and the T2 port is connected to the A1 port; when electromagnet YV8 is energized, the PJ port of the extrusion roller feeding control valve group (14) is connected to the A1 port, and the T2 port is connected to the B1 port; when electromagnets YV9 and YV11 are energized, the PJ port of the extrusion roller feeding control valve group (14) is connected to the B2 port, and the T2 port is connected to the A2 port; electromagnets YV10, YV12, When YV13 is energized, the PJ port of the extrusion roller feeding control valve group (14) is connected to the A2 port, and the T2 port is connected to the B2 port; when the electromagnet YV14 is energized, the PS port of the extrusion roller feeding control valve group (14) is connected to the B3 port, and the T2 port is connected to the A3 port; when the electromagnet YV15 is energized, the PS port of the extrusion roller feeding control valve group (14) is connected to the A3 port, and the T2 port is connected to the B3 port.

[0066] When the gate cylinder (19) is activated, the electromagnet YV5 of the large vane pump solenoid relief valve (24) of the pressure control valve group (13) is energized, the large vane pump in the double vane pump (7) is pressurized, and the pressure oil of the large vane pump enters the PF port of the cooperating control valve group (15). When the electromagnet YV16 of the cooperating control valve group (15) is energized, the pressure oil enters the rodless chamber of the gate cylinder (19) through the B4 port. The rod chamber of the gate cylinder (19) is connected to the oil tank (1) through the A4 port and the T3 port, and the cylinder rod of the gate cylinder (19) extends. When the electromagnet YV17 of the cooperating control valve group (15) is energized, the pressure oil enters the rod chamber of the gate cylinder (19) through the A4 port. The rodless chamber of the gate cylinder (19) is connected to the oil tank (1) through the B4 port and the T3 port, and the cylinder rod of the gate cylinder (19) retracts.

[0067] When the lifting cylinder (20) is activated, the electromagnet YV5 of the large vane pump solenoid relief valve (24) of the pressure control valve group (13) is energized, and the large vane pump in the double vane pump (7) is pressurized. The pressure oil of the large vane pump enters the PF port of the coordinated control valve group (15). When the electromagnet YV18 of the coordinated control valve group (15) is energized, the pressure oil enters the rodless chamber of the lifting cylinder (20) through the B5 port. The rod chamber of the lifting cylinder (20) is connected to the oil tank (1) through the A5 port and the T3 port, and the cylinder rod of the lifting cylinder (20) extends. When the electromagnet YV19 of the coordinated control valve group (15) is energized, the pressure oil enters the rod chamber of the lifting cylinder (20) through the A5 port. The rodless chamber of the lifting cylinder (20) is connected to the oil tank (1) through the B5 port and the T3 port, and the cylinder rod of the lifting cylinder (20) retracts.

[0068] When the push-pull box cylinder (21) is activated, the electromagnet YV5 of the large vane pump solenoid relief valve (24) of the pressure control valve group (13) is energized, the large vane pump in the double vane pump (7) is pressurized, and the pressure oil of the large vane pump enters the PF port of the coordinated control valve group (15). When the electromagnet YV20 of the coordinated control valve group (15) is energized, the pressure oil enters the rodless chamber of the push-pull box cylinder (21) through the B6 port. The rod chamber of the push-pull box cylinder (21) is connected to the oil tank (1) through the A6 port and the T3 port, and the cylinder rod of the push-pull box cylinder (21) extends. When the electromagnet YV21 of the coordinated control valve group (15) is energized, the pressure oil enters the rod chamber of the push-pull box cylinder (21) through the A6 port. The rodless chamber of the push-pull box cylinder (21) is connected to the oil tank (1) through the B6 port and the T3 port, and the cylinder rod of the push-pull box cylinder (21) retracts.

[0069] When the lock cylinder (22) is activated, the electromagnet YV5 of the large vane pump solenoid relief valve (24) of the pressure control valve group (13) is energized, and the large vane pump in the double vane pump (7) is pressurized. The pressure oil of the large vane pump enters the PF port of the coordinated control valve group (15). When the electromagnet YV22 of the coordinated control valve group (15) is energized, the pressure oil enters the rodless chamber of the lock cylinder (22) through the B7 port. The rod chamber of the lock cylinder (22) is connected to the oil tank (1) through the A7 port and the T3 port. The cylinder rod of the lock cylinder (22) extends. When the electromagnet YV23 of the coordinated control valve group (15) is energized, the pressure oil enters the rod chamber of the lock cylinder (22) through the A7 port. The rodless chamber of the lock cylinder (22) is connected to the oil tank (1) through the B7 port and the T3 port. The cylinder rod of the lock cylinder (22) retracts.

[0070] When the feeding cylinder (18) performs rapid feeding action, the electromagnet YV5 of the large blade pump solenoid relief valve (24) and the electromagnet YV6 of the small blade pump solenoid relief valve (23) of the pressure control valve group (13) are energized. The large blade pump and the small blade pump in the double blade pump (7) work simultaneously under pressure. The pressure oil from the large and small blade pumps merges and enters the PS port of the extrusion roller feeding control valve group (14). When the electromagnet YV14 of the extrusion roller feeding control valve group (14) is energized, the pressure... Oil enters the rodless chamber of the feeding cylinder (18) through port B3. The rod chamber of the feeding cylinder (18) is connected to the oil tank (1) through ports A3 and T2. The cylinder rod of the feeding cylinder (18) extends quickly. When the electromagnet YV15 of the extrusion roller feeding control valve group (14) is energized, the pressure oil enters the rod chamber of the feeding cylinder (18) through port A3. The rodless chamber of the feeding cylinder (18) is connected to the oil tank (1) through ports B3 and T2. The cylinder rod of the feeding cylinder (18) retracts quickly.

[0071] Similarly, when the electromagnet YV5 of the large blade pump solenoid overflow valve (24) is energized, only the large blade pump in the double blade pump (7) is pressurized and the electromagnet YV14 of the extrusion roller feeding control valve group (14) is energized, and the feeding cylinder (18) realizes medium-speed feeding.

[0072] Similarly, when the electromagnet YV6 of the small vane pump solenoid overflow valve (23) is energized, only the small vane pump in the double vane pump (7) is pressurized and the electromagnet YV14 of the extrusion roller feeding control valve group (14) is energized, and the feeding cylinder (18) realizes slow feeding.

[0073] When the low-speed, high-torque hydraulic motor (16) of the bag-breaking roller is activated, the solenoids YV1, YV2, YV3, and YV4 of the large variable pump pressure relief solenoid valve (34), the large variable pump low-pressure solenoid valve (31), the small variable pump pressure relief solenoid valve (37), and the small variable pump low-pressure solenoid valve (28) of the pressure control valve group (13) are energized. The large variable pump (3) and the small variable pump (5) are simultaneously pressurized. The pressure oil from the large variable pump (3) and the small variable pump (5) flows into the PJ port of the extrusion roller feeding control valve group (14). When the solenoid YV7 of the extrusion roller feeding control valve group (14) is energized, the pressure... Oil enters the forward rotation port of the low-speed, high-torque hydraulic motor (16) through port B1. The reverse rotation port of the low-speed, high-torque hydraulic motor (16) is connected to the oil tank (1) through ports A1 and T2. The low-speed, high-torque hydraulic motor (16) rotates, realizing the forward rotation of the bag-breaking roller. When the electromagnet YV8 of the extrusion roller feeding control valve group (14) is energized, the pressure oil enters the reverse rotation port of the low-speed, high-torque hydraulic motor (16) through port A1. The forward rotation port of the low-speed, high-torque hydraulic motor (16) is connected to the oil tank (1) through ports B1 and T2. The low-speed, high-torque hydraulic motor (16) rotates, realizing the reverse rotation of the bag-breaking roller.

[0074] When the extrusion pusher device extends rapidly under small load, the solenoids YV1, YV2, YV3, and YV4 of the large variable pump pressure relief solenoid valve (34), the large variable pump low pressure solenoid valve (31), the small variable pump pressure relief solenoid valve (37), and the small variable pump low pressure solenoid valve (28) of the pressure control valve group (13) are energized. The large variable pump (3) and the small variable pump (5) are pressurized at the same time. The pressure oil from the large variable pump (3) and the small variable pump (5) flows into the PJ port of the extrusion roller feeding control valve group (14). When the solenoid YV11 of the extrusion roller feeding control valve group (14) is energized, the pressure oil enters the rodless chamber of the extrusion cylinder (17) through the B2 port. The rod chamber of the extrusion cylinder (17) is connected to the oil tank (1) through the A2 port and the T2 port. The cylinder rod of the extrusion cylinder (17) extends rapidly, driving the extrusion pusher device to achieve rapid material pressing under small load.

[0075] Similarly, the solenoids YV1, YV2, YV3, and YV4 of the large variable pump pressure relief solenoid valve (34), the large variable pump low pressure solenoid valve (31), the small variable pump pressure relief solenoid valve (37), and the small variable pump low pressure solenoid valve (28) of the pressure control valve group (13) are energized, and the solenoid YV11 of the extrusion roller feeding control valve group (14) is energized. When the extrusion pusher device extends the pressing material quickly under a small load, so that the actual working pressure of the hydraulic system reaches the constant power variable point of the variable pump, the constant power variable mechanism of the large variable pump (3) and the small variable pump (5) is automatically triggered. The large variable pump (3) and the small variable pump (5) automatically reduce the displacement as the pressure increases, and maintain the combined output under constant power to drive the extrusion pusher device to achieve large load slow pressing.

[0076] Similarly, when the extrusion pusher device presses the material at a high load and slow speed, causing the actual working pressure of the hydraulic system to reach the remote constant pressure variable control set value of the variable pump, that is, the pressure holding and strong extrusion point, the solenoids YV3 and YV4 of the small variable pump pressure relief solenoid valve (37) and the low pressure solenoid valve (28) of the small variable pump in the pressure control valve group (13) are energized, and only the small variable pump (5) pressurizes and works. The solenoid YV11 of the extrusion roller feeding control valve group (14) is energized. The remote constant pressure variable mechanism of the small variable pump (5) is automatically triggered and takes priority over its constant power variable mechanism control. The displacement of the small variable pump (5) is further reduced to provide the oil output required to maintain the internal leakage of the system and the pressure holding and slow extension of the extrusion cylinder, driving the extrusion pusher device to achieve pressure holding and strong extrusion.

[0077] When the extrusion pusher device retracts rapidly, the solenoids YV1 and YV3 of the large variable pump pressure relief solenoid valve (34) and the small variable pump pressure relief solenoid valve (37) of the pressure control valve group (13) are energized. The large variable pump (3) and the small variable pump (5) work simultaneously under low pressure. The pressure oil from the large variable pump (3) and the small variable pump (5) flows into the PJ port of the extrusion roller feeding control valve group (14). When the solenoids YV10, YV12 and YV13 of the extrusion roller feeding control valve group (14) are energized, the pressure oil enters the rod chamber of the extrusion cylinder (17) through the A2 port. The rodless chamber of the extrusion cylinder (17) is connected to the oil tank (1) through the B2 port and the T2 port. The cylinder rod of the extrusion cylinder (17) retracts rapidly, driving the extrusion pusher device to achieve low-pressure rapid retraction.

[0078] Similarly, when the extrusion pusher device is about to quickly retract into position, in order to avoid collision when it reaches the position, the electromagnet YV3 of the small variable pump pressure relief solenoid valve (37) of the pressure control valve group (13) is energized, and only the small variable pump (5) operates at low pressure. The electromagnets YV10 and YV13 of the extrusion roller feeding control valve group (14) are energized, and the oil supply is proportionally controlled by the extrusion proportional solenoid reversing valve (43) to realize the slow retraction of the extrusion cylinder, driving the extrusion pusher device to achieve slow retraction.

[0079] This utility model provides a novel hydraulic control system for a household waste dry and wet sorting device, comprising the following steps:

[0080] Obtain the squeeze start signal;

[0081] The first motor (2) drives the large variable pump (3) and the second motor (4) drives the small variable pump (5) to work under high pressure, together supplying oil to the rodless chamber of the extrusion cylinder (17). The cylinder rod of the extrusion cylinder (17) is quickly extended by the extrusion electro-hydraulic reversing valve (44), driving the extrusion push head device to achieve rapid extension of the pressing material under small load.

[0082] When the extrusion pusher device extends the pressing material quickly under a small load, causing the actual working pressure of the hydraulic system to reach the constant power variable point of the variable pump, the constant power variable mechanism of the large variable pump (3) and the small variable pump (5) is automatically triggered. As the pressure increases, the large variable pump (3) and the small variable pump (5) automatically reduce the displacement and maintain the combined output under constant power to drive the extrusion pusher device to achieve large load slow pressing.

[0083] When the extrusion pusher device presses the material at a high load and slow speed, the actual working pressure of the hydraulic system reaches the remote constant pressure variable control setting value of the variable pump, that is, the pressure holding and strong extrusion point. The large variable pump (3) driven by the first motor (2) depressurizes, and only the second motor (4) drives the small variable pump (5) to continue pressurizing. The remote constant pressure variable mechanism of the small variable pump (5) is automatically triggered and takes priority over its constant power variable mechanism control. The displacement of the small variable pump (5) is automatically further reduced to provide the oil output required to maintain the internal leakage of the system and the pressure holding and slow extension of the extrusion cylinder, driving the extrusion pusher device to achieve pressure holding and strong extrusion and wet separation.

[0084] When the actual time of pressure holding and strong squeezing separation reaches the pressure holding and squeezing set time, the squeezing cylinder (17) extends and the squeezing ends. The first motor (2) drives the large variable pump (3) and the second motor (4) drives the small variable pump (5) to work at low pressure at the same time, and together supply oil to the rod chamber of the squeezing cylinder (17) at low pressure and limited pressure. The squeezing electro-hydraulic reversing valve (44), the squeezing proportional electromagnetic reversing valve (43), and the hydraulic control check valve (47) jointly control the cylinder rod of the squeezing cylinder (17) to retract quickly, and drive the squeezing push head device to retract quickly.

[0085] When the actual stroke of the extrusion pusher is about to reach the cyclic retraction position of the extrusion pusher, the large variable pump (3) driven by the first motor (2) depressurizes, and only the small variable pump (5) driven by the second motor (4) continues to work under low pressure. The extrusion electro-hydraulic reversing valve (44) is closed, and the extrusion cylinder is slowly retracted by the proportional control of the extrusion proportional electromagnetic reversing valve (43), so as to drive the extrusion pusher to retract slowly.

[0086] The extrusion cycle ends when the actual stroke of the extrusion cylinder reaches the retraction position of the extrusion pusher device.

[0087] Compared with the prior art, the hydraulic control system of the novel dry and wet waste sorting equipment provided by this utility model has at least the following advantages:

[0088] 1. Adopting constant power and remote constant pressure control logic suitable for the existing dry and wet waste sorting equipment, the dry and wet sorting equipment can operate at constant power under multiple working conditions, and has low loss and high working efficiency under pressure holding and strong squeezing conditions.

[0089] 2. Slow proportional control is used for the retraction of the extrusion cylinder to avoid the impact and damage to the equipment caused by the rapid retraction of the large extrusion cylinder, resulting in less vibration;

[0090] 3. The system generates less heat and has lower requirements for heat dissipation performance.

[0091] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel hydraulic control system for a dry and wet waste sorting device, characterized in that, The hydraulic control system of the new type of dry and wet waste sorting equipment includes: a large variable pump (3) driven by a first motor (2), a small variable pump (5) driven by a second motor (4), a double vane pump (7) driven by a third motor (6), a cooling circulation pump (10) driven by a fourth motor (9), a pressure control valve group (13), a squeezing roller feeding control valve group (14), a coordination control valve group (15), a squeezing cylinder (17), a low-speed high-torque hydraulic motor (16), a feeding cylinder (18), a gate blocking cylinder (19), a gate lifting cylinder (20), a push-pull box cylinder (21), a box locking cylinder (22), a return oil filter (8), a circulation filter (11), an air cooler (12), and an oil tank (1). The large variable pump (3) is connected and driven by the first motor (2), and is inserted into the oil tank (1) from the top surface of the oil tank (1) to draw oil through the suction pipe; The small variable pump (5) is connected and driven by the second motor (4), and is inserted into the oil tank (1) from the top surface of the oil tank (1) to draw oil through the suction pipe; The double vane pump (7) is connected and driven by a third motor (6), and is inserted into the oil tank (1) from the top surface of the oil tank (1) to suck oil through the suction pipe; The cooling circulation pump (10) is connected and driven by the fourth motor (9), and is inserted into the oil tank (1) from the top surface of the oil tank (1) to draw oil through the suction pipe; the output end of the cooling circulation pump (10) cools the hydraulic oil through the air cooler (12) and then flows back to the oil tank (1) through the circulation filter (11). The input port P1 of the pressure control valve group (13) is connected to the output port B of the large variable pump (3), and the input port X1 is connected to the remote pressure regulating port X of the output port of the large variable pump (3); the input port P2 of the pressure control valve group (13) is connected to the output port B of the small variable pump (5), and the input port X2 is connected to the remote pressure regulating port X of the output port of the small variable pump (5); the input port P3 of the pressure control valve group (13) is connected to the output port of the large vane pump in the double vane pump (7); the input port P4 of the pressure control valve group (13) is connected to the output port of the small vane pump in the double vane pump (7); the return oil port T1 of the output port of the pressure control valve group (13) is hydraulically connected to the return oil filter (8) on the oil tank (1); the output port L1 of the pressure control valve group (13) is hydraulically connected to the oil tank (1). The input port PJ of the extrusion roller feeding control valve group (14) is connected to the output port PA of the pressure control valve group (13); the input port PS of the extrusion roller feeding control valve group (14) is connected to the output port PB of the pressure control valve group (13); the return oil port T2 of the output end of the extrusion roller feeding control valve group (14) is hydraulically connected to the return oil filter (8) on the oil tank (1) for oil return; the working oil port of the output end of the extrusion roller feeding control valve group (14) is hydraulically connected to the extrusion cylinder (17), the low-speed high-torque hydraulic motor (16), and the feeding cylinder (18) respectively. The input port PF of the coordinated control valve group (15) is hydraulically connected to the output port PB of the pressure control valve group (13); the return oil port T3 of the output port of the coordinated control valve group (15) is hydraulically connected to the return oil filter (8) on the oil tank (1) for return oil; the working oil port of the output port of the coordinated control valve group (15) is hydraulically connected to the gate cylinder (19), the door lifting cylinder (20), the push-pull box cylinder (21), and the lock box cylinder (22) respectively.

2. The hydraulic control system of the novel dry and wet waste sorting equipment according to claim 1, characterized in that, The large variable pump (3) is a multi-functional variable piston pump with constant power control and remote constant pressure control; the small variable pump (5) is a multi-functional variable piston pump with constant power control and remote constant pressure control.

3. The hydraulic control system of the novel dry and wet waste sorting equipment according to claim 1, characterized in that, The pressure control valve group (13) includes: a large variable pump check valve (33), a large variable pump pressure transmitter (32), a large variable pump pressure relief solenoid valve (34), a large variable pump low-pressure solenoid valve (31), a large variable pump low-pressure regulating valve (35), a large variable pump high-pressure regulating valve (30), a small variable pump check valve (36), a small variable pump pressure transmitter (29), a small variable pump pressure relief solenoid valve (37), a small variable pump low-pressure solenoid valve (28), a small variable pump low-pressure regulating valve (38), a small variable pump high-pressure regulating valve (27), a variable pump safety relief valve (39), a large blade pump check valve (40), a large blade pump solenoid relief valve (24), a large blade pump pressure transmitter (26), a small blade pump check valve (41), a small blade pump solenoid relief valve (23), and a small blade pump pressure transmitter (25). The input ends of the large variable pump check valve (33) and the large variable pump pressure transmitter (32) are connected to the valve group P1 port through the oil circuit of the pressure control valve group (13), and the output end of the large variable pump check valve (33) is connected to the valve group PA port through the oil circuit of the pressure control valve group (13). The input ends of the large variable pump pressure relief solenoid valve (34), the large variable pump low pressure solenoid valve (31), and the large variable pump high pressure regulating valve (30) are connected to the valve group X1 port through the oil circuit of the pressure control valve group (13); the output end of the large variable pump low pressure solenoid valve (31) is connected to the input end of the large variable pump low pressure regulating valve (35); the output ends of the large variable pump pressure relief solenoid valve (34), the large variable pump low pressure regulating valve (35), and the large variable pump high pressure regulating valve (30) are connected to the valve group L1 port through the oil circuit of the pressure control valve group (13). The input ends of the small variable pump check valve (36) and the small variable pump pressure transmitter (29) are connected to the P2 port of the pressure control valve group (13) through the oil circuit, and the output end of the small variable pump check valve (36) is connected to the PA port of the pressure control valve group (13) through the oil circuit. The input ends of the small variable pump pressure relief solenoid valve (37), the small variable pump low-pressure solenoid valve (28), and the small variable pump high-pressure regulating valve (27) are connected to the X2 port of the pressure control valve group (13) through the oil circuit; the output end of the small variable pump low-pressure solenoid valve (28) is connected to the input end of the small variable pump low-pressure regulating valve (38); the output ends of the small variable pump pressure relief solenoid valve (37), the small variable pump low-pressure regulating valve (38), and the small variable pump high-pressure regulating valve (27) are connected to the L1 port of the pressure control valve group (13) through the oil circuit. The input end of the variable pump safety relief valve (39) is connected to the output ends of the large variable pump check valve (33) and the small variable pump check valve (36); the output end of the variable pump safety relief valve (39) is connected to the T1 port of the pressure control valve group (13) through the oil circuit. The input terminals of the large-blade pump electromagnetic overflow valve (24), the large-blade pump check valve (40), and the large-blade pump pressure transmitter (26) are connected to the P3 port of the pressure control valve group (13) through the oil circuit; the output terminal of the large-blade pump check valve (40) is connected to the PB port of the pressure control valve group (13) through the oil circuit; and the output terminal of the large-blade pump electromagnetic overflow valve (24) is connected to the return oil T1 port of the pressure control valve group (13) through the oil circuit. The input terminals of the small vane pump solenoid relief valve (23), the small vane pump check valve (41), and the small vane pump pressure transmitter (25) are connected to the P4 port of the pressure control valve group (13) through the oil circuit; the output terminal of the small vane pump check valve (41) is connected to the PB port of the pressure control valve group (13) through the oil circuit; and the output terminal of the small vane pump solenoid relief valve (23) is connected to the return oil T1 port of the pressure control valve group (13) through the oil circuit.

4. The hydraulic control system of the novel dry and wet waste sorting equipment according to claim 1, characterized in that, The extrusion roller feeding control valve group (14) includes: roller electro-hydraulic reversing valve (42), extrusion proportional solenoid reversing valve (43), extrusion electro-hydraulic reversing valve (44), pilot solenoid reversing valve (45), hydraulic control check valve (47), and feeding electro-hydraulic reversing valve (46). The input ends of the roller electro-hydraulic directional valve (42), the extrusion proportional solenoid directional valve (43), the extrusion electro-hydraulic directional valve (44), and the pilot solenoid directional valve (45) are connected to the PJ port of the extrusion roller feeding control valve group (14) through the oil circuit; the input end of the feeding electro-hydraulic directional valve (46) is connected to the PS port of the extrusion roller feeding control valve group (14) through the oil circuit. The return oil ends of the roller electro-hydraulic reversing valve (42), the extrusion ratio electromagnetic reversing valve (43), the extrusion electro-hydraulic reversing valve (44), the hydraulic control check valve (47), and the feeding electro-hydraulic reversing valve (46) are connected to the valve group T2 port through the oil circuit of the extrusion roller feeding control valve group (14). The pilot port of the hydraulic control check valve (47) is connected to the output end of the pilot solenoid directional valve (45), and the oil drain port of the hydraulic control check valve (47) and the oil return port of the pilot solenoid directional valve (45) are connected to the L2 port of the extrusion roller feeding control valve group (14) through the oil circuit. The two output ends of the roller electro-hydraulic reversing valve (42) are connected to the input port of the low-speed high-torque hydraulic motor (16) through the oil circuit A1 and B1 ports of the extrusion roller feeding control valve group (14); The output end of one side of the extrusion proportional electromagnetic reversing valve (43) and the extrusion electro-hydraulic reversing valve (44) is connected to the rod chamber of the extrusion cylinder (17) through the oil circuit confluence port A2 of the extrusion roller feeding control valve group (14); the output end of the other side of the extrusion proportional electromagnetic reversing valve (43), the extrusion electro-hydraulic reversing valve (44) and the hydraulic control check valve (47) is connected to the rodless chamber of the extrusion cylinder (17) through the oil circuit confluence port B2 of the extrusion roller feeding control valve group (14). One output end of the feeding electro-hydraulic reversing valve (46) is connected to the rod chamber of the feeding cylinder (18) through the oil circuit A3 port of the extrusion roller feeding control valve group (14); the other output end of the feeding electro-hydraulic reversing valve (46) is connected to the rodless chamber of the feeding cylinder (18) through the oil circuit B3 port of the extrusion roller feeding control valve group (14).

5. The hydraulic control system of the novel dry and wet waste sorting equipment according to claim 1, characterized in that, The oil drain port of the low-speed high-torque hydraulic motor (16) is connected to the oil tank (1) via a pipeline with low back pressure through the L2 port of the extrusion roller feeding control valve group (14) and the L1 port of the pressure control valve group (13).

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