Hydraulic system for high-frequency vibrating screen exciter and high-frequency vibrating screen exciter

Abstract

The utility model discloses a hydraulic system for a high-frequency vibrating screen exciter and the high-frequency vibrating screen exciter, and relates to the technical field of hydraulic equipment. In the system, an outlet of a hydraulic pump is connected with inlets of a main oil way and an overflow oil way, and outlets of the main oil way and the overflow oil way are connected with an inlet of an oil return way; an excitation motor is arranged on the main oil way; an overflow valve is arranged on the overflow oil way and is connected with a reversing valve; the oil supplementing path is connected between the outlet and the inlet of the main oil path; a first one-way valve is arranged on the oil return way, and a second one-way valve is arranged on the oil supplement way. When the overflow valve disconnects the oil path between the hydraulic pump and the oil return path, the oil supplementing path is in an open-circuit state under the pressure of the main oil path; when the overflow valve communicates with the oil way between the hydraulic pump and the oil return way, part of oil flowing out of the outlet of the main oil way flows to the oil supplementing way under the back pressure of the first one-way valve and is supplemented into the inlet of the main oil way through the second one-way valve. The system can reduce the impact influence on the excitation motor when the pump is stopped at a high rotating speed.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic equipment, in particular to a hydraulic system for a high-frequency vibrating screen exciter and the high-frequency vibrating screen exciter. Background Art

[0002] In recent years, with the rapid development of infrastructure and mining energy industries, the disadvantages of traditional screening equipment have become increasingly prominent, especially when the material is fine and wet, the screening efficiency is seriously reduced. In order to adapt to the development needs of the new situation, hydraulic high-frequency vibrating screen came into being.

[0003] In a current hydraulic high-frequency vibrating screen, an exciting motor is used to drive the eccentric block to rotate to achieve vibration output. In the high-frequency vibration operation of the vibrating screen, the maximum speed of the exciting motor can reach more than 4000rpm. It is often the case that when the exciting motor switches from the high-speed working state to the shutdown state, there is inevitably a problem of insufficient oil replenishment caused by the oil supply when the pump is stopped. The exciting motor sucks air and the exciting motor is affected by the impact: the internal wear of the exciting motor is accelerated, the internal leakage of the exciting motor increases, the speed is reduced, and the actual output vibration frequency is reduced. At the same time, the inertia of the motor rotating at high speed may also cause negative pressure damage to the pump in the reverse direction. Under long-term action, the performance of the entire machine will be reduced, and the service life of the entire vibrating screen will also be significantly reduced.

[0004] Therefore, how to reduce the impact of the vibration motor when the pump stops at a high speed is a technical problem that technical personnel in this field need to solve at present. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a hydraulic system for a high-frequency vibrating screen exciter and a high-frequency vibrating screen exciter including the hydraulic system, which can reduce the impact of the excitation motor when the pump stops at a high speed.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A hydraulic system for a high-frequency vibrating screen exciter, comprising a hydraulic pump, a main oil circuit, an overflow oil circuit, an oil replenishment oil circuit and an oil return oil circuit;

[0008] The outlet of the hydraulic pump is connected to the inlet of the main oil circuit and the overflow oil circuit, and the outlets of the main oil circuit and the overflow oil circuit are connected to the inlet of the oil return circuit;

[0009] The main oil circuit is provided with a vibration motor module, and the vibration motor module includes a vibration motor;

[0010] A relief valve is arranged on the relief oil circuit, and the relief valve is connected to a reversing valve, so as to control the opening and closing of the pilot chamber of the relief valve and the oil return oil circuit through the reversing valve, thereby making the relief valve connect or disconnect the oil circuit between the hydraulic pump and the oil return oil circuit;

[0011] The oil replenishment circuit is connected between the outlet and the inlet of the main oil circuit;

[0012] A first one-way valve is provided on the oil return line, and a second one-way valve is provided on the oil supply line;

[0013] When the overflow valve is closed and the oil circuit between the hydraulic pump and the return oil circuit is disconnected, the oil replenishment circuit is in a circuit-breaking state under the pressure of the main oil circuit; when the overflow valve is opened and the oil circuit between the hydraulic pump and the return oil circuit is connected, part of the oil flowing out of the main oil circuit outlet flows to the oil replenishment circuit under the back pressure of the first one-way valve, and is replenished into the inlet of the main oil circuit through the second one-way valve.

[0014] Preferably, the opening pressure of the first one-way valve is greater than the opening pressure of the second one-way valve.

[0015] Preferably, the reversing valve is a solenoid valve; when the reversing valve is energized, the pilot chamber of the overflow valve is disconnected from the oil return circuit, and when the reversing valve is de-energized, the pilot chamber of the overflow valve is connected to the oil return circuit.

[0016] Preferably, the vibration motor module includes a vibration module speed regulating valve, a vibration module flow meter and the vibration motor in sequence along the oil flow direction on the main oil circuit.

[0017] Preferably, the main oil circuit includes at least two excitation oil circuits arranged in parallel, and each of the excitation motor modules is arranged in a one-to-one correspondence on each of the excitation oil circuits.

[0018] Preferably, each of the second one-way valves, the vibration module speed regulating valve in each of the vibration motor modules, and the vibration module flow meter in each of the vibration motor modules are all integrated and assembled on the same hydraulic integrated block structure.

[0019] A high-frequency vibrating screen exciter comprises the above hydraulic system.

[0020] The utility model provides a hydraulic system for a high-frequency vibrating screen exciter, comprising a hydraulic pump, a main oil circuit, an overflow oil circuit, an oil replenishing oil circuit and an oil return oil circuit; the outlet of the hydraulic pump is connected to the inlet of the main oil circuit and the overflow oil circuit, and the outlets of the main oil circuit and the overflow oil circuit are connected to the inlet of the return oil circuit; a vibration motor module is arranged on the main oil circuit, and the vibration motor module comprises a vibration motor; an overflow valve is arranged on the overflow oil circuit, and the overflow valve is connected to a reversing valve to control the opening and closing of the pilot chamber of the overflow valve and the return oil circuit through the reversing valve, so as to connect or disconnect the oil circuit between the hydraulic pump and the return oil circuit by the overflow valve; the oil replenishing oil circuit is connected between the outlet and the inlet of the main oil circuit; a first one-way valve is arranged on the return oil circuit, and a second one-way valve is arranged on the oil replenishing oil circuit.

[0021] When the overflow valve is closed and the oil circuit between the hydraulic pump and the return oil circuit is disconnected, the oil replenishment circuit is in a circuit-breaking state under the pressure of the main oil circuit; when the overflow valve is opened and the oil circuit between the hydraulic pump and the return oil circuit is connected, part of the oil flowing out of the main oil circuit outlet flows to the oil replenishment circuit under the back pressure of the first one-way valve, and is replenished into the inlet of the main oil circuit through the second one-way valve.

[0022] When the vibrating screen needs to be shut down, the reversing valve controls the pilot chamber of the overflow valve to be connected to the oil return line, and the overflow valve is unloaded. At this time, the oil output of the hydraulic pump flows to the overflow line in addition to the main oil line. At this time, the hydraulic pump cannot meet the high-speed rotation requirements of the excitation motor under low pressure, and the excitation motor will change from high-pressure active drive to passive oil suction. At this time, the second one-way valve is opened, and the outlet of the excitation motor is connected to the inlet of the excitation motor through the oil replenishment line. Part of the oil in the main oil line is replenished back to the main oil line through the second one-way valve of the oil replenishment line, which prolongs the deceleration time of the excitation motor. The excitation motor decelerates and enters the idle state, and the stopping action is smoother, which can reduce the impact of the excitation motor when the pump stops at high speed and prolong the service life of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0024] Figure 1 A hydraulic component connection diagram of a specific embodiment 1 of the hydraulic system provided by the utility model;

[0025] Figure 2 The oil circuit diagram of the specific embodiment 1 of the hydraulic system provided by the utility model in the high-speed working state;

[0026] Figure 3The oil circuit diagram of the specific embodiment 1 of the hydraulic system provided by the utility model in the deceleration and shutdown state;

[0027] Figure 4 This is a component connection diagram of the heat dissipation motor module in the specific embodiment 1 of the hydraulic system provided by the utility model;

[0028] Figure 5 This is a component connection diagram of the vibration motor module in the specific embodiment 1 of the hydraulic system provided by the utility model;

[0029] Figure 6 The oil circuit diagram of the hydraulic integrated block structure in the specific embodiment 1 of the hydraulic system provided by the utility model under high-speed working state;

[0030] Figure 7 This is an oil circuit diagram of the hydraulic integrated block structure in the specific embodiment 1 of the hydraulic system provided by the utility model in the deceleration and shutdown state.

[0031] Reference numerals:

[0032] Hydraulic pump 1;

[0033] Main motor 2;

[0034] Overflow oil circuit 3, overflow valve 31, reversing valve 32;

[0035] Heat dissipation oil circuit 4, heat dissipation module speed regulating valve 41, heat dissipation module flow meter 42, heat dissipation motor 43, heat dissipation device 44;

[0036] Oil return line 5, first one-way valve 51;

[0037] Main oil circuit 6, excitation oil circuit 61, excitation module speed regulating valve 611, excitation module flow meter 612, excitation motor 613;

[0038] Oil supply circuit 7, second one-way valve 71;

[0039] Pumping station 8;

[0040] High frequency screen 9. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] The core of the utility model is to provide a hydraulic system for a high-frequency vibrating screen exciter and a high-frequency vibrating screen exciter including the hydraulic system, which can reduce the impact of the excitation motor on the pump stopping at a high speed.

[0043] The hydraulic system provided by the utility model for driving the high-frequency vibrating screen exciter, please refer to Figures 1 to 7 , including a hydraulic pump 1, a main oil circuit 6, an overflow oil circuit 3, an oil replenishment oil circuit 7 and an oil return oil circuit 5.

[0044] The hydraulic pump 1 is used to provide pressure oil for each actuator in the hydraulic system. The outlet of the hydraulic pump 1 is connected to the inlet of the main oil circuit 6 and the overflow oil circuit 3, and the outlets of the main oil circuit 6 and the overflow oil circuit 3 are connected to the inlet of the return oil circuit 5. The main oil circuit 6 and the overflow oil circuit 3 are arranged in parallel.

[0045] The main oil circuit 6 is provided with a vibration motor module, which includes a vibration motor 613. The vibration motor 613 is used to drive the eccentric block of the vibration exciter to rotate in the high-frequency vibration screen exciter, and provide high-frequency vibration for the vibration screen at a high speed.

[0046] The overflow oil circuit 3 is provided with an overflow valve 31, and the overflow valve 31 is connected to a reversing valve 32, so as to control the opening and closing of the pilot chamber of the overflow valve 31 and the oil return oil circuit 5 through the reversing valve 32, thereby connecting or disconnecting the oil circuit between the hydraulic pump 1 and the oil return oil circuit 5. The reversing valve 32 is used to control the opening and closing of the pilot chamber oil of the overflow valve 31 and the oil return oil circuit 5 by switching the oil circuit, thereby switching the unloading and loading states of the overflow valve 31. The overflow valve 31 is used to load the hydraulic pump 1 in the loading state and play a safe overflow role in the system, and unload the hydraulic pump 1 in the unloading state, and the outlet of the hydraulic pump 1 is connected to the oil return oil circuit 5.

[0047] The replenishing oil circuit 7 is connected between the outlet and the inlet of the main oil circuit 6. A first one-way valve 51 is arranged on the return oil circuit 5, and a second one-way valve 71 is arranged on the replenishing oil circuit 7. Among them, the first one-way valve 51 is used to provide return oil back pressure for the hydraulic pump 1 when unloading, so that the hydraulic oil can overcome the height difference between the ground oil tank and the hydraulic high-frequency vibrating screen, and replenish the hydraulic oil into the vibration motor 613. The second one-way valve 71 is used to isolate the inlet of the main oil circuit 6 from the return oil circuit 5 when the vibrating screen is in the working state, so that the vibration motor 613 works under high pressure. When the vibrating screen is in the idling state, the second one-way valve 71 opens during the passive oil suction deceleration process of the vibration motor 613 to replenish hydraulic oil to the vibration motor 613 to prevent air suction.

[0048] When the relief valve 31 is closed and disconnects the oil circuit between the hydraulic pump 1 and the return oil circuit 5, the replenishing oil circuit 7 is in an open-circuit state under the pressure of the main oil circuit 6. When the relief valve 31 is opened and connects the oil circuit between the hydraulic pump 1 and the return oil circuit 5, part of the oil from the hydraulic pump 1 reaches the first one-way valve 51, and part of the oil flowing out of the outlet of the main oil circuit 6 flows to the replenishing oil circuit 7 under the back pressure of the first one-way valve 51, and flows back to the inlet of the main oil circuit through the second one-way valve 71. Part of the oil at the outlet of the main oil circuit 6 may also flow back to the oil tank.

[0049] When the vibrating screen needs to start working, start the main motor 2. When running at normal high speed, refer to Figure 1 and Figure 2 , the reversing valve 32 controls the pilot chamber of the overflow valve 31 to be disconnected from the return oil circuit 5, so as to disconnect the outlet of the hydraulic pump 1 from the return oil circuit 5. At this time, when the oil at the outlet of the hydraulic pump 1 flows to the node A, it will not flow to the overflow oil circuit 3 on the left, but will flow to the right into the main oil circuit 6 to supply oil to the vibration motor 613 on the main oil circuit 6. At this time, for the second one-way valve 71, the pressure at the node B is higher than that at the node C, and the second one-way valve 71 is automatically closed. Accordingly, the oil replenishment circuit 7 is also in a disconnected state, and the oil at the outlet of the main oil circuit 6 flows back to the return oil circuit 5.

[0050] When the vibrating screen needs to be shut down, Figure 1 and Figure 3 As shown, the reversing valve 32 controls the pilot chamber of the relief valve 31 to communicate with the oil return line 5, and the relief valve 31 is unloaded. At this time, after the oil output of the hydraulic pump 1 flows to node A, in addition to flowing to the right to the main oil circuit 6, it also flows to the left to the overflow oil circuit 3. At this time, the hydraulic pump 1 cannot meet the high-speed rotation requirements of the vibration motor 613 under low pressure, and the vibration motor 613 will change from high-pressure active drive to passive oil suction. At this time, for the second one-way valve 71, specifically, the pressure of node B is lower than the pressure of node C, the second one-way valve 71 is opened, and the outlet of the vibration motor 613 is connected to the inlet of the vibration motor 613 through the oil replenishing oil circuit 7. Under the back pressure of the first one-way valve 51, part of the oil output of the main oil circuit 6 is replenished back to the main oil circuit 6 through the second one-way valve 71 of the oil replenishing oil circuit 7, so that the deceleration time of the vibration motor 613 is extended, and the vibration motor 613 decelerates and enters the idle state, and the stopping action is smoother, which can reduce the impact of the vibration motor 613 when the pump stops at high speed, thereby extending the service life of the equipment. After running for a period of time, the exciting motor 613 stops rotating automatically and the whole machine stops running. Specifically, a time relay control can be added to the electrical control system of the whole machine. When a certain time is reached, the main motor 2 stops automatically, completing the shutdown action of the vibrating screen.

[0051] Furthermore, the opening pressure of the first one-way valve 51 is greater than the opening pressure of the second one-way valve 71, so as to ensure that the negative pressure in the pipeline acts when the vibration motor 613 passively absorbs oil, and the second one-way valve 71 can be opened smoothly, so that the hydraulic oil can be replenished into the vibration motor 613 through the oil replenishment line 7, thereby preventing the vibration motor 613 from being sucked empty. Of course, in other embodiments, the opening pressure of the first one-way valve 51 may also be equal to the opening pressure of the second one-way valve 71.

[0052] Furthermore, the reversing valve 32 is a solenoid valve, which is convenient for automatic control. When the reversing valve 32 is energized, the pilot chamber of the relief valve 31 is disconnected from the oil return line 5, and when the reversing valve 32 is de-energized, the pilot chamber of the relief valve 31 is connected to the oil return line 5.

[0053] Specifically, the overflow valve 31 and the reversing valve 32 can use standard electromagnetic overflow valve products, or they can be replaced by drive oil circuit reversing elements with the same function. They can be manually driven or electromagnetically driven, as long as they have elements or element combinations that can realize the loading and unloading functions of the hydraulic pump 1.

[0054] Furthermore, if Figure 1 As shown, the hydraulic system further includes a heat dissipation oil circuit 4, the inlet of the heat dissipation oil circuit 4 is connected to the hydraulic pump 1, and the outlet of the heat dissipation oil circuit 4 is connected to the inlet of the oil return oil circuit 5. A heat dissipation motor module is provided on the heat dissipation oil circuit 4, and the heat dissipation motor module is connected to a heat dissipation device 44, which can specifically be a fan. The heat dissipation device 44 dissipates heat from the oil return oil circuit 5, which can ensure that the oil temperature of the hydraulic system is constant at a suitable temperature when the hydraulic system works for a long time.

[0055] Among them, preferably, Figure 4 As shown, the heat dissipation motor module includes a heat dissipation module speed regulating valve 41 , a heat dissipation module flow meter 42 and a heat dissipation motor 43 which are sequentially arranged along the oil flow direction on the heat dissipation oil circuit 4 , and a heat dissipation device 44 is connected to the heat dissipation motor 43 .

[0056] Specifically, the heat dissipation module flow meter 42 can be used by the staff to observe the actual oil inlet flow of the heat dissipation motor 43, so that the staff can further calculate whether the heat dissipation motor 43 is working at the required speed based on the flow, and then adaptively adjust the valve opening of the heat dissipation module speed regulating valve 41, so that the heat dissipation motor 43 can work at a suitable speed to ensure the heat dissipation capacity of the heat dissipation device 44.

[0057] Furthermore, if Figure 2 and Figure 4 As shown, in the vibration motor module, along the oil flow direction on the main oil circuit 6, the vibration module speed regulating valve 611, the vibration module flow meter 612 and the vibration motor 613 are included in sequence.

[0058] The vibration module flow meter 612 is used by the staff to observe the actual oil inlet flow of the corresponding vibration motor 613, so that the staff can calculate whether the corresponding vibration motor 613 is working at the required speed according to the vibration module flow meter 612. The vibration module speed regulating valve 611 controls the oil inlet flow of the vibration motor 613 by adjusting its valve opening to obtain the speed required by the vibration motor 613 in the system, thereby obtaining different screen vibration frequencies.

[0059] Specifically, the vibration module speed regulating valve 611 is a two-way speed regulating valve. The two-way speed regulating valve is used to adjust the flow, which can avoid unnecessary flow loss and mutual interference of parallel oil circuits, so that the output pressure oil of the hydraulic pump 1 can all enter the vibration motor 613, greatly improving the efficiency of the whole machine. The flow adjustment form of the vibration module speed regulating valve 611 is not limited to manual adjustment, and can also be replaced by a proportional throttle valve adjusted by various electrical signals. The speed regulating valve with post-valve compensation and pressure reduction throttling can be replaced.

[0060] Specifically, the excitation module flowmeter 612 can be a flowmeter for visual observation, or other components with the function of detecting the flow of the excitation motor 613, or a flowmeter in the form of electrical signal output, and the observation scheme is not limited to visual observation.

[0061] Furthermore, if Figure 1 As shown, the main oil circuit 6 includes at least two excitation oil circuits 61 arranged in parallel, and each excitation motor module is arranged on each excitation oil circuit 61 in a one-to-one correspondence. Figure 1 As shown, two second one-way valves 71 can be provided on the oil supply oil circuit 7. In addition, there is no limit on the number of parallel connections of the excitation oil circuit 61, and various numbers of excitation motors 613 can be replaced according to the requirements of the screen layout.

[0062] The excitation module speed regulating valve 611 is specifically a pressure reducing speed regulating valve with post-valve compensation. The excitation oil circuits 61 are connected in parallel, and the excitation motors 613 on each circuit adjust the flow in the separate circuit of each excitation motor 613 through the excitation module speed regulating valve 611. Through the post-valve compensation capability of the excitation module speed regulating valve 611, the actual speed of each excitation motor 613 is not affected by different loads and the same oil inlet pressure, so that the speed of each excitation motor 613 can be adjusted separately without affecting each other, and the output speed of each excitation motor 613 can also be stabilized when connected in parallel.

[0063] Furthermore, if Figure 6 and Figure 7As shown, each second one-way valve 71, each vibration module speed regulating valve 611 in each vibration motor module, and each vibration module flow meter 612 in each vibration motor module are integrated and assembled on the same hydraulic integrated block structure. All vibration module speed regulating valves 611 are installed on a dedicated hydraulic integrated block, and a vibration module flow meter 612 is installed at the outlet of each vibration module speed regulating valve 611 to observe the actual flow entering each vibration motor 613. The modular structure is adopted for easy assembly.

[0064] Of course, in other embodiments, the excitation module speed regulating valve 611, the excitation module flow meter 612, and the second one-way valve 71 may also be replaced by various other forms of component combinations. For example, the components may be connected by pipes to achieve the same control function.

[0065] The hydraulic system provided in this embodiment is used to drive the high-frequency vibrating screen exciter, and the working principle includes:

[0066] When the vibrating screen needs to start working, start the main motor 2. When the reversing valve 32 of the hydraulic pump 1 loses power, the relief valve 31 is unloaded. After the whole machine is started without load, the reversing valve 32 is energized, the relief valve 31 is loaded, and the hydraulic pump 11 supplies pressure oil to each actuator motor.

[0067] 1. If Figure 1 As shown, oil circuit heat dissipation: by adjusting the valve opening of the heat dissipation module speed regulating valve 41 in the heat dissipation motor module and observing the heat dissipation module flow meter 42. The heat dissipation motor 43 of the heat dissipation motor module is adjusted to work at the appropriate speed recommended by the manufacturer to ensure the overall heat dissipation power of the heat dissipation device 44, so that the oil temperature of the hydraulic system is constant at an appropriate temperature during long-term operation.

[0068] 2. If Figure 1 , Figure 2 and Figure 7 High-speed working state shown: In the main oil circuit 6, adjust the valve opening of the excitation module speed regulating valve 611 of the excitation motor module, and observe the flow reading of the excitation module flow meter 612. According to the material requirements of the vibrating screen, adjust the excitation motor 613 at each screen to a suitable speed, so as to obtain the screen vibration frequency configuration scheme with the maximum processing capacity of the whole machine.

[0069] At this time, the second one-way valve 71 is closed, and the pressure oil output by the hydraulic pump 1 all enters each actuator motor without any extra flow loss. The excitation module speed regulating valve 611 in each parallel excitation oil circuit 61 has a valve post-pressure compensation function, so that no matter the load changes and the same oil inlet pressure, it will not affect the actual oil inlet flow of each excitation motor 613. The speed of the excitation motor 613 is only related to the valve opening in the excitation module speed regulating valve 611, so that each excitation motor 613 can work with stable flow.

[0070] 3. Stop and decelerate state: When the vibrating screen needs to stop, the reversing valve 32 loses power, the pilot chamber of the relief valve 31 returns oil, and the relief valve 31 is unloaded. At this time, the hydraulic pump 1 cannot meet the high-speed rotation requirements of the exciting motor 613 under low pressure, and the exciting motor 6138 will inevitably change from high-pressure active drive to passive oil suction.

[0071] At this time, part of the hydraulic oil output by the hydraulic pump 1 is replenished into the vibration motor 613 through the main oil circuit 6, and part of the oil passes through the overflow valve 31 and the first one-way valve 51 into the oil tank. The back pressure generated by the oil flowing out of the vibration motor 613 when passing through the first one-way valve 51 causes part of the oil to overcome the height difference along the pipeline and enter the second one-way valve 71. Since the opening pressure of the second one-way valve 71 is slightly lower than that of the first one-way valve 51, and the negative pressure in the pipeline acts when the vibration motor 613 passively absorbs oil, the second one-way valve 71 opens, and the hydraulic oil is replenished into the vibration motor 613 to prevent the vibration motor 613 from being sucked empty.

[0072] During the deceleration process, the oil inlet and return lines of the vibration motor 613 are in a connected state. At this time, the pressure points in the hydraulic system are balanced, and the actual speed of the vibration motor 613 decreases accordingly, and the rate of decrease is related to the flow rate flowing through the first one-way valve 51 in the system. After a period of deceleration, the vibration motor 613 stops rotating, thereby realizing a smooth deceleration process of the vibration motor 6138 from a high speed.

[0073] The oil inlet and return lines of the vibration motor 613 are in a connected state. At this time, the pressure points in the system are balanced, and the actual speed of the vibration motor 613 decreases accordingly. The reduction rate is related to the flow rate flowing through the first one-way valve 51 in the system, thereby achieving a smooth deceleration process of the vibration motor 613 from a high speed and completing the shutdown action of the vibrating screen.

[0074] In this embodiment, the exciting motor 613 enters an idle working state from a high speed before stopping the action and then stops rotating, which can effectively reduce the impact of the exciting motor 613 on the pump stopping at a high speed. At the same time, in the exciting motor module, the flow adjustment method of the hydraulic integrated block composed of a visual flow meter and a speed regulating valve is adopted, so that the vibration screen can freely adjust the amplitude and frequency configuration of different screens according to different working conditions, and a more reasonable power distribution scheme is obtained in the performance of the whole machine, ensuring that the high-frequency vibration screen products have the same power configuration. Under the premise of the same power configuration, the vibration screen of this technical solution can obtain a better screening and processing capacity. During operation, according to the incoming material situation, the vibration frequency of the screen with less incoming material can be manually reduced to protect the vibration screen exciter and various structural components, and there will be no situation of weak excitation. In addition, the output pressure oil of the hydraulic system can all enter the actuator, which improves the efficiency of the whole machine.

[0075] The hydraulic system provided by the utility model is used for a high-frequency vibrating screen exciter, which can reduce the impact of the excitation motor when the pump stops at a high speed to achieve the purpose of system dynamic braking and deceleration. At the same time, the speed of each excitation motor can be adjusted according to the working conditions to obtain a better power distribution plan and screening processing capacity, which can extend the service life of the whole machine, increase the dynamic braking effect in the system to control the motor deceleration, so as to achieve the purpose of system dynamic braking and deceleration.

[0076] In addition to the above hydraulic system, the utility model also provides a high-frequency vibrating screen exciter, which includes a hydraulic system, which can be specifically a hydraulic system provided in any of the above embodiments, and the beneficial effects can be referred to the above embodiments accordingly. The structures of other parts of the high-frequency vibrating screen exciter can be referred to the prior art, and will not be described in detail herein.

[0077] It should be noted that when an element is referred to as "fixed" to another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element in the middle at the same time. In addition, in the description of the present utility model, unless otherwise specified, "multiple", "multiple roots", and "multiple groups" mean two or more.

[0078] The terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0079] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0080] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0081] The high-frequency vibrating screen exciter and the hydraulic system for the high-frequency vibrating screen exciter provided by the utility model are introduced in detail above. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A hydraulic system for a high-frequency vibrating screen exciter, characterized in that: It comprises a hydraulic pump (1), a main oil circuit (6), an overflow oil circuit (3), an oil replenishment oil circuit (7) and an oil return oil circuit (5); The outlet of the hydraulic pump (1) is connected to the inlet of the main oil circuit (6) and the overflow oil circuit (3), and the outlets of the main oil circuit (6) and the overflow oil circuit (3) are connected to the inlet of the return oil circuit (5); The main oil circuit (6) is provided with a vibration motor module, and the vibration motor module comprises a vibration motor (613); The overflow oil circuit (3) is provided with an overflow valve (31), and the overflow valve (31) is connected to a reversing valve (32) so as to control the opening and closing of the pilot chamber of the overflow valve (31) and the oil return oil circuit (5) through the reversing valve (32), thereby making the overflow valve (31) connect or disconnect the oil circuit between the hydraulic pump (1) and the oil return oil circuit (5); The oil replenishment circuit (7) is connected between the outlet and the inlet of the main oil circuit (6); A first one-way valve (51) is provided on the oil return oil circuit (5), and a second one-way valve (71) is provided on the oil supply oil circuit (7); When the overflow valve (31) is closed and disconnects the oil circuit between the hydraulic pump (1) and the oil return circuit (5), the oil replenishment circuit (7) is in an open circuit state under the pressure of the main oil circuit (6); when the overflow valve (31) is opened and connects the oil circuit between the hydraulic pump (1) and the oil return circuit (5), part of the oil flowing out of the outlet of the main oil circuit (6) flows to the oil replenishment circuit (7) under the back pressure of the first one-way valve (51), and is replenished into the inlet of the main oil circuit (6) through the second one-way valve (71).

2. The hydraulic system according to claim 1, characterized in that: The opening pressure of the first one-way valve (51) is greater than the opening pressure of the second one-way valve (71).

3. The hydraulic system according to claim 1, characterized in that: The reversing valve (32) is a solenoid valve; when the reversing valve (32) is energized, the pilot chamber of the overflow valve (31) is disconnected from the oil return line (5); when the reversing valve (32) is de-energized, the pilot chamber of the overflow valve (31) is connected to the oil return line (5).

4. The hydraulic system according to any one of claims 1 to 3, characterized in that: The vibration motor module includes, in sequence, a vibration module speed regulating valve (611), a vibration module flow meter (612) and the vibration motor (613) along the oil flow direction on the main oil circuit (6).

5. The hydraulic system according to claim 4, characterized in that: The main oil circuit (6) comprises at least two vibration oil circuits (61) arranged in parallel, and each of the vibration motor modules is arranged on each of the vibration oil circuits (61) in a one-to-one correspondence.

6. The hydraulic system according to claim 4, characterized in that: Each of the second one-way valves (71), the vibration module speed regulating valve (611) in each of the vibration motor modules, and the vibration module flow meter (612) in each of the vibration motor modules are all integrated and assembled on the same hydraulic integrated block structure.

7. A high frequency vibrating screen exciter, characterized in that: A hydraulic system comprising any one of claims 1 to 6.

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