Screening station hydraulic control system and screening station

Abstract

The utility model discloses a screening station hydraulic control system which comprises a controller, an oil tank, an oil pump, an electric proportional multi-way valve group and a plurality of conveying motors, each conveying motor is independently provided with a pressure sensor and a rotating speed sensor, and the pressure sensors are in communication connection with the controller and used for detecting the real-time load pressure of the corresponding conveying motors. The rotating speed sensor is in communication connection with the controller and used for detecting the real-time rotating speed of the corresponding conveying motor. Pressure and speed feedback control is formed through the pressure sensor, the rotating speed sensor and the electric proportional multi-way valve, and the hydraulic system can automatically adjust the running speed of the conveying belt and share the flow according to the size of the load of equipment, so that shutdown caused by belt pressing due to excessive material stacking of the conveying belts is avoided, and stable running of the equipment is ensured. The utility model further discloses the screening station comprising the hydraulic control system of the screening station.

Description

Technical Field

[0001] The utility model relates to the field of material screening, in particular to a hydraulic control system for a screening station. In addition, the utility model also relates to a screening station comprising the hydraulic control system for the screening station. Background Art

[0002] Screening stations are widely used in various technical fields. They deliver hydraulic oil to multiple conveying motors through oil pumps. The conveying motors provide power for different conveyor belts to transport different types of screened materials.

[0003] In the field of mobile crushing and screening equipment, heavy-duty screening stations transport different raw materials at different construction sites, and the weight of materials transported by each conveyor belt is also different. Some construction sites have more fine materials and less coarse and medium materials, or more medium materials and less coarse materials, or more coarse materials and less medium materials, and so on. When there is too much of a certain type of material, the conveyor belt with too much material will be pressed and stopped, and manual cleaning is required, which is more troublesome.

[0004] Therefore, how to provide a screening station hydraulic control system that realizes flow sharing is a technical problem that those skilled in the art currently need to solve. Utility Model Content

[0005] The present invention aims to provide a hydraulic control system for a screening station. This system uses pressure and speed sensors to monitor the parameters of each conveying motor in real time, and controls the flow of hydraulic oil to each conveying motor based on the monitoring results, thereby achieving flow sharing and automatic speed adjustment. Another object of the present invention is to provide a screening station including the aforementioned hydraulic control system.

[0006] In order to solve the above technical problems, the utility model provides a hydraulic control system for a screening station, including a controller, an oil tank, an oil pump, an electric proportional multi-way valve group and multiple conveying motors, each of the conveying motors is individually equipped with a pressure sensor and a speed sensor, the pressure sensor is communicatively connected to the controller and is used to detect the real-time load pressure corresponding to the conveying motor, the speed sensor is communicatively connected to the controller and is used to detect the real-time speed corresponding to the conveying motor, when the controller receives that the real-time load pressure of some of the conveying motors is greater than a preset pressure and the real-time speed is less than a preset speed, the controller can control the valve opening of the conveying motor corresponding to the detected abnormality in the electric proportional multi-way valve group to increase, and control the valve opening of the remaining conveying motors in the electric proportional multi-way valve group to decrease.

[0007] Preferably, the plurality of conveying motors include a coarse material conveyor belt motor, a fine material conveyor belt motor, a medium material conveyor belt motor, a transition conveyor belt motor and a feeder motor, and five of the pressure sensors and five of the speed sensors are correspondingly provided.

[0008] Preferably, when the real-time speed of the coarse material conveyor belt motor, the fine material conveyor belt motor, the medium material conveyor belt motor and / or the transition conveyor belt motor is greater than the preset speed, and the real-time load pressure is greater than the preset pressure, the controller can control the valve opening corresponding to the feeder motor in the electric proportional multi-way valve group to decrease.

[0009] Preferably, one end oil port of each of the conveying motors is connected to the oil tank via an oil replenishment one-way valve.

[0010] Preferably, the electric proportional multi-way valve group is specifically a post-valve compensation electric proportional multi-way valve group controlled by a load-independent flow distribution system.

[0011] Preferably, the oil pump is a load-sensing hydraulic pump.

[0012] Preferably, the post-valve compensation electric proportional multi-way valve group includes a valve group respectively connected to each of the conveying motors, each of the valve groups includes a hydraulically controlled proportional three-position seven-way reversing valve, a pilot reversing valve and two electric proportional pressure regulating valves, and the two electric proportional pressure regulating valves are respectively connected to the hydraulic control ports at both ends of the hydraulically controlled proportional three-position seven-way reversing valve.

[0013] Preferably, the load-sensing hydraulic pump is provided with a pressure output port and a hydraulic control output port, the pressure output port is connected to the oil inlet of each hydraulically controlled proportional three-position seven-way reversing valve, and the hydraulic control output port is connected to each electric proportional pressure regulating valve.

[0014] Preferably, the post-valve compensation electric proportional multi-way valve group further includes a hydraulically controlled overflow valve and a hydraulically controlled safety valve.

[0015] The utility model provides a screening station, comprising the screening station hydraulic control system as described in any one of the above items.

[0016] The utility model provides a hydraulic control system for a screening station, which includes a controller, an oil tank, an oil pump, an electric proportional multi-way valve group and a plurality of conveying motors. Each conveying motor is individually equipped with a pressure sensor and a speed sensor. The pressure sensor is communicatively connected to the controller and is used to detect the real-time load pressure of the corresponding conveying motor. The speed sensor is communicatively connected to the controller and is used to detect the real-time speed of the corresponding conveying motor.

[0017] During the working process, the screened materials are transported to the corresponding conveyor belts, and their respective conveying motors provide power for the conveyor belts. At the same time, the pressure sensors and speed sensors matched to each conveying motor monitor the conveying motors in real time and send the detection results to the controller. After receiving the information, the controller compares it with the preset values ​​input in advance. If the real-time load pressure of some conveying motors is greater than the preset pressure and the real-time speed is less than the preset speed, it means that there is too much material on the conveyor belt corresponding to this part of the conveying motors and the conveying motor cannot provide enough power. Then the controller controls the valve opening of the corresponding conveying motor with abnormal detection in the electric proportional multi-way valve group to increase, and the flow through the abnormal conveying motor increases, so that the conveyor belt with high pressure runs at a higher speed to ensure the carrying capacity. At the same time, the valve opening of the remaining conveying motors in the electric proportional multi-way valve group is controlled to decrease, and the flow through the remaining normal conveying motors is reduced, the speed of the conveyor belt with low pressure is reduced, and the flow is shared with the conveyor belt with high pressure. Pressure and speed feedback control is achieved through pressure sensors, speed sensors and electric proportional multi-way valves. The hydraulic system can automatically adjust the conveyor belt speed and share flow according to the load of the equipment, thereby avoiding belt pressure and downtime caused by excessive material accumulation on each conveyor belt, ensuring stable operation of the equipment.

[0018] The present utility model also provides a screening station including the above-mentioned screening station hydraulic control system. Since the above-mentioned screening station hydraulic control system has the above-mentioned technical effects, the above-mentioned screening station should also have the same technical effects, which will not be introduced in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A hydraulic principle diagram of a specific embodiment of the hydraulic control system of the screening station provided by the utility model;

[0020] Figure 2 This is a hydraulic principle diagram of a conveying motor in a specific embodiment of the hydraulic control system of a screening station provided by the present invention;

[0021] Figure 3 This is a hydraulic principle diagram of a post-valve compensation electric proportional multi-way valve group in a specific embodiment of the hydraulic control system of a screening station provided by the present invention;

[0022] Figure 4 This is a hydraulic principle diagram of a load-sensing hydraulic pump in a specific embodiment of the hydraulic control system of a screening station provided by the present invention;

[0023] Figure 5 This is a control principle diagram of a specific implementation of the hydraulic control system for a screening station provided by the utility model.

[0024] Among them, the oil tank 1, the load-sensitive hydraulic pump 2, the pump body 21, the load hydraulic control valve group 22, the post-valve compensation electric proportional multi-way valve group 3, the hydraulically controlled proportional three-position seven-way reversing valve 31, the pilot reversing valve 32, two electric proportional pressure regulating valves 33, the hydraulically controlled overflow valve 34, the hydraulically controlled safety valve 35, the pressure sensor 4, the speed sensor 5, the coarse material conveyor belt motor 6, the fine material conveyor belt motor 7, the medium material conveyor belt motor 8, the transition conveyor belt motor 9, the feeder motor 10, and the oil replenishment check valve 11. DETAILED DESCRIPTION

[0025] The core of this utility model is to provide a screening station hydraulic control system. This system uses pressure sensors and speed sensors to detect the parameters of each conveying motor in real time. Based on the detection results, it controls the hydraulic oil flow output to each conveying motor, achieving flow sharing and automatic speed adjustment. Another core of this utility model is to provide a screening station including this screening station hydraulic control system.

[0026] In order to enable those skilled in the art to better understand the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods.

[0027] Please refer to Figures 1 to 5 , Figure 1 A hydraulic principle diagram of a specific embodiment of the hydraulic control system of the screening station provided by the utility model; Figure 2 This is a hydraulic principle diagram of a conveying motor in a specific embodiment of the hydraulic control system of a screening station provided by the present invention; Figure 3 This is a hydraulic principle diagram of a post-valve compensation electric proportional multi-way valve group in a specific embodiment of the hydraulic control system of a screening station provided by the present invention; Figure 4 This is a hydraulic principle diagram of a load-sensing hydraulic pump in a specific embodiment of the hydraulic control system of a screening station provided by the present invention; Figure 5 This is a control principle diagram of a specific implementation of the hydraulic control system for a screening station provided by the utility model.

[0028] The specific embodiment of the present invention provides a hydraulic control system for a screening station, including a controller, an oil tank 1, an oil pump, an electric proportional multi-way valve group and a plurality of conveying motors. The oil tank 1 provides hydraulic oil for the entire system and receives return oil. The oil pump draws the oil in the oil tank 1 and provides pressure oil. The plurality of conveying motors are connected to different conveyor belts. The pressure oil output by the oil pump enters each conveying motor through the control of the electric proportional multi-way valve group, thereby driving each conveyor belt to operate and transport different types of materials. The electric proportional multi-way valve group is internally provided with a plurality of valves, each corresponding to each conveying motor. By controlling the electric proportional multi-way valve group, the opening of the different valves can be changed to control the transfer of each conveying motor and ultimately control the operating speed of each conveyor belt. Each conveying motor is individually equipped with a pressure sensor 4 and a speed sensor 5. The pressure sensor 4 is connected to the controller in communication and is used to detect the real-time load pressure of the corresponding conveying motor. The speed sensor 5 is connected to the controller in communication and is used to detect the real-time speed of the corresponding conveying motor.

[0029] During the working process, the screened materials are transported to the corresponding conveyor belts, and the conveyor belts are powered by their respective conveying motors. At the same time, the pressure sensors 4 and speed sensors 5 matched to each conveying motor monitor the conveying motors in real time and send the detection results to the controller. After receiving the information, the controller compares it with the preset values ​​input in advance. If the real-time load pressure of some conveying motors is greater than the preset pressure, and the real-time speed is less than the preset speed, it means that there is too much material on the conveyor belt corresponding to this part of the conveying motors, and the conveying motor cannot provide enough power. Then the controller controls the valve opening of the corresponding conveying motor with abnormal detection in the electric proportional multi-way valve group to increase, and the flow through the abnormal conveying motor increases, so that the conveyor belt with high pressure runs at a higher speed to ensure the carrying capacity. At the same time, the valve opening of the corresponding other conveying motors in the electric proportional multi-way valve group is controlled to decrease, and the flow through the other normal conveying motors is reduced, the speed of the conveyor belt with low pressure is reduced, and the flow is shared with the conveyor belt with high pressure. Pressure and speed feedback control is formed by the pressure sensor 4, the speed sensor 5 and the electric proportional multi-way valve. The hydraulic system can automatically adjust the conveyor belt running speed according to the size of the equipment load and share the flow, thereby avoiding the conveyor belts from being pressed and shut down due to excessive material accumulation, and ensuring stable operation of the equipment.

[0030] Specifically, the plurality of conveying motors include a coarse material conveyor belt motor 6, a fine material conveyor belt motor 7, an intermediate material conveyor belt motor 8, a transition conveyor belt motor 9, and a feeder motor 10, which are respectively used to convey coarse material, fine material, intermediate material, filtered material, and initial raw material, and are correspondingly provided with five pressure sensors 4 and five speed sensors 5. The pressure values ​​detected by the corresponding pressure sensors 4 for the coarse material conveyor belt motor 6, the fine material conveyor belt motor 7, the intermediate material conveyor belt motor 8, the transition conveyor belt motor 9, and the feeder motor 10 are P1 to P5, and the speed values ​​detected by the corresponding speed sensors 5 are SP1 to SP5. At the same time, based on actual needs and experience, the rated pressure of each motor is preset to P1i to P5i, and the rated speed of each motor is preset to SP1i to SP5i. The preset pressure is 1.2 times P1i to P5i, and the preset speed is 0.8 times SP1i to SP5i. Of course, each parameter can also be adjusted, all within the scope of protection of the present utility model.

[0031] Taking the coarse material conveyor belt motor 6 as an example of the specific working process, when the real-time load pressure detected by the pressure sensor 4 corresponding to the coarse material conveyor belt motor 6 is greater than 1.2 times P1i, and the real-time speed of the speed sensor 5 corresponding to the coarse material conveyor belt motor 6 is less than 0.8 times SP1i, the controller makes a judgment and outputs an adjustment current, which is fed back to the electric proportional multi-way valve group. The electric proportional multi-way valve group controls the opening ratio of this valve of the coarse material conveyor belt motor 6 to increase the flow rate, so that the coarse material conveyor belt with high pressure runs at a higher speed. At the same time, the electric proportional multi-way valve group automatically inputs a relatively small current to reduce the opening ratio of other valves and reduce the flow rate, thereby reducing the speed of the remaining conveyor belts. That is, the speed of the conveyor belt with low pressure slows down, and its flow rate is shared with the conveyor belt with high pressure. The control method of other conveyor belts is similar to the above method.

[0032] Furthermore, when the real-time speed of the coarse material conveyor belt motor 6, the fine material conveyor belt motor 7, the intermediate material conveyor belt motor 8, and / or the transition material conveyor belt motor 9 exceeds a preset speed, and the real-time load pressure exceeds a preset pressure, the controller can control the valve opening of the corresponding feeder motor 10 in the electric proportional multi-way valve assembly to decrease. Specifically, if the speed of the high-pressure conveyor belt has increased, and the value SP detected by the corresponding speed sensor 5 is greater than 0.9 times SP1i to SP5i, but the real-time load pressure detected by the pressure sensor 4 is still greater than 1.2 times P1i to P5i, this feedback is fed to the feeder, and the electric proportional multi-way valve assembly controls the valve corresponding to the feeder motor 10 and inputs a low current signal to reduce the valve opening ratio and flow rate, thereby reducing the feeder speed SP5 and preventing the excessively high-pressure conveyor belt from being compressed and shutting down.

[0033] In order to achieve oil replenishment, one end oil port of each delivery motor is connected to the oil tank 1 through an oil replenishment one-way valve 11.

[0034] On the basis of the hydraulic control system of the screening station provided in each of the above-mentioned specific embodiments, the electric proportional multi-way valve group is specifically a post-valve compensation electric proportional multi-way valve group 3 controlled by a load-independent flow distribution system. Regardless of whether the oil pump output flow is saturated, the compound action flow distribution is proportional to the valve core opening, that is, it is proportional to the current of the control proportional electromagnet, and has nothing to do with the load size. This ensures that the conveyor belt with a large load can also be accelerated, and the flow will not be distributed entirely to the conveyor belt with a small load. Furthermore, the oil pump is specifically a load-sensitive hydraulic pump 2, which is a hydraulic compensator that simultaneously senses the system pressure and flow requirements and enables the pump to respond correctly to changes in flow pressure requirements.

[0035] Specifically, the post-valve compensation electric proportional multi-way valve group 3 includes valve groups corresponding to each conveying motor, and each valve group includes a hydraulically controlled proportional three-position seven-way reversing valve 31, a pilot reversing valve 32 and two electric proportional pressure regulating valves 33. The two electric proportional pressure regulating valves 33 are respectively connected to the hydraulic control ports at both ends of the hydraulically controlled proportional three-position seven-way reversing valve 31. The load-sensitive hydraulic pump 2 is provided with a pressure output port and a hydraulic control output port. The load-sensitive hydraulic pump 2 includes a pump body 21 and a load hydraulic control valve group 22. The outlet of the pump body 21 is the pressure output port, and the outlet of the load hydraulic control valve group 22 is the hydraulic control output port. The pressure output port is connected to the oil inlet of each hydraulically controlled proportional three-position seven-way reversing valve 31. The hydraulically controlled proportional three-position seven-way reversing valve 31 passes through the pilot reversing valve 32 and then passes through the hydraulically controlled proportional three-position seven-way reversing valve 31 to connect to the oil ports at both ends of each corresponding conveying motor. The hydraulic control output port is connected to each electric proportional pressure regulating valve 33, and then the two electric proportional pressure regulating valves 33 are respectively connected to the hydraulic control ports at both ends of the hydraulically controlled proportional three-position seven-way reversing valve 31. During operation, the hydraulic oil output from the hydraulically controlled output port enters each electric proportional pressure regulating valve 33, and controls the opening of each electric proportional pressure regulating valve 33 through current, thereby controlling the pressure entering the hydraulically controlled port of the hydraulically controlled proportional three-position seven-way reversing valve 31, and then proportionally controls the flow of the hydraulically controlled proportional three-position seven-way reversing valve 31, thereby realizing proportional control of each conveying motor.

[0036] To improve safety, the post-valve compensation electric proportional multi-way valve group 3 also includes a hydraulically controlled relief valve 34 and a hydraulically controlled safety valve 35. The inlet of the hydraulically controlled relief valve 34 is connected to the pressure output port, and the outlet of the hydraulically controlled relief valve 34 is connected to the oil tank 1. At the same time, the hydraulic control port of the hydraulically controlled relief valve 34 is connected to the hydraulic control output port, the inlet of the hydraulically controlled safety valve 35 is connected to the hydraulic control output port, and the outlet of the hydraulically controlled safety valve 35 is connected to the oil tank 1. When the pressure is too high, the hydraulically controlled relief valve 34 and the hydraulically controlled safety valve 35 open to release the pressure.

[0037] In addition to the above-mentioned screening station hydraulic control system, the specific embodiment of the present invention also provides a screening station including the above-mentioned screening station hydraulic control system. For the structures of other parts of the screening station, please refer to the existing technology and will not be described in detail herein.

[0038] The above describes in detail the hydraulic control system and screening station provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concept of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A hydraulic control system for a screening station, characterized in that: The invention comprises a controller, an oil tank (1), an oil pump, an electric proportional multi-way valve group and a plurality of conveying motors, each of the conveying motors is individually equipped with a pressure sensor (4) and a speed sensor (5), the pressure sensor (4) is communicatively connected to the controller and is used to detect the real-time load pressure of the corresponding conveying motor, the speed sensor (5) is communicatively connected to the controller and is used to detect the real-time speed of the corresponding conveying motor, and when the controller receives that the real-time load pressure of some of the conveying motors is greater than a preset pressure and the real-time speed is less than a preset speed, the controller can control the valve opening of the conveying motor corresponding to the detected abnormality in the electric proportional multi-way valve group to increase, and control the valve opening of the remaining conveying motors in the electric proportional multi-way valve group to decrease.

2. The hydraulic control system of the screening station according to claim 1, characterized in that: The plurality of conveying motors include a coarse material conveyor belt motor (6), a fine material conveyor belt motor (7), a medium material conveyor belt motor (8), a transition conveyor belt motor (9) and a feeder motor (10), and five of the pressure sensors (4) and five of the speed sensors (5) are correspondingly provided.

3. The hydraulic control system of the screening station according to claim 2, characterized in that: When the real-time rotation speed of the coarse material conveyor belt motor (6), the fine material conveyor belt motor (7), the medium material conveyor belt motor (8) and / or the transition conveyor belt motor (9) is greater than the preset rotation speed, and the real-time load pressure is greater than the preset pressure, the controller can control the valve opening corresponding to the feeder motor (10) in the electric proportional multi-way valve group to decrease.

4. The hydraulic control system of the screening station according to claim 1, characterized in that: The oil port at one end of each of the conveying motors is connected to the oil tank (1) via an oil replenishment one-way valve (11).

5. The hydraulic control system for a screening station according to any one of claims 1 to 4, characterized in that: The electric proportional multi-way valve group is specifically a post-valve compensation electric proportional multi-way valve group (3) controlled by a load-independent flow distribution system.

6. The hydraulic control system of the screening station according to claim 5, characterized in that: The oil pump is specifically a load-sensitive hydraulic pump (2).

7. The hydraulic control system of the screening station according to claim 6, characterized in that: The post-valve compensation electric proportional multi-way valve group (3) includes valve groups correspondingly connected to each of the conveying motors, each of the valve groups includes a hydraulically controlled proportional three-position seven-way reversing valve (31), a pilot reversing valve (32) and two electric proportional pressure regulating valves (33), and the two electric proportional pressure regulating valves (33) are respectively connected to the hydraulic control ports at both ends of the hydraulically controlled proportional three-position seven-way reversing valve (31).

8. The hydraulic control system of the screening station according to claim 7, characterized in that: The load-sensing hydraulic pump (2) is provided with a pressure output port and a hydraulic control output port, the pressure output port being connected to the oil inlet of each hydraulically controlled proportional three-position seven-way reversing valve (31), and the hydraulic control output port being connected to each electric proportional pressure regulating valve (33).

9. The hydraulic control system of the screening station according to claim 8, characterized in that: The post-valve compensation electric proportional multi-way valve group (3) further includes a hydraulically controlled overflow valve (34) and a hydraulically controlled safety valve (35).

10. A screening station, characterized in that: It comprises the screening station hydraulic control system according to any one of claims 1 to 9.

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