Fully hydraulic spiral clearing system for grain silos and automatic clearing control method

Abstract

The present invention relates to the technical field of grain storage equipment, and in particular to a full hydraulic screw clearing system for grain silos and an automatic clearing control method. In the full hydraulic screw clearing system for grain silos, the electric control system can control the output of the hydraulic system to adjust the spiral parameters of the spiral conveying device according to the spiral driving pressure information monitored in real time by the monitoring component, so that the spiral conveying device can clear the grain silo according to the spiral parameters. When the grain in the silo is severely compacted, the spiral driving pressure of the spiral conveying device increases, the hydraulic system automatically adjusts the output flow, the spiral speed decreases, and the torque increases. Under the same power, the driving torque is large and the ability to break the compaction is stronger, which can reduce the number of people entering the silo for operation. At the same time, there are no electrical components in the silo, which can fundamentally solve the electrical dust explosion problem of the cleaning machine in the bulk grain silo, and has higher safety.

Description

Technical Field

[0001] The invention relates to the technical field of grain storage equipment, and in particular to a full hydraulic spiral silo clearing system for grain silos and an automatic silo clearing control method. Background Art

[0002] When the grain is discharged from the grain silo, a certain amount of grain will remain after the grain flows out of the center discharge port at the bottom of the silo. Currently, the remaining grain is mainly cleaned out of the silo by a silo cleaning machine. Due to the complex working environment in the silo, the dust concentration is high and the grain is easy to compact, so the silo cleaning machine must have the characteristics of dust explosion prevention, pressure resistance, bending resistance, compaction breaking, high working efficiency, simple operation, and convenient use and maintenance.

[0003] At present, the warehouse cleaning machines used are mainly electric spiral warehouse cleaning machines, but the electric spiral warehouse cleaning machines have the following main problems:

[0004] 1. According to the latest dust explosion-proof standards for grain silos, the interior of the silo is explosion-proof for Zone 20. However, there are currently no explosion-proof motors that have obtained Zone 20 dust explosion-proof certification. The use of electric drive has certain safety hazards.

[0005] 2. When the grain in the silo is compacted, the distribution of compacted materials is complex and different in each silo. When the motor is at a low speed, it is in a constant torque output state, and the output torque remains basically unchanged. It cannot meet the requirements of large torque compaction clearance operations, and the ability to break compaction is poor;

[0006] 3. The electric spiral bin cleaner needs to be started with load or full load, and the starting current is large, resulting in a large instantaneous load on the power supply system. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a fully hydraulic spiral clearing system and a clearing control method for grain silos, which have large driving torque and stronger ability to break compactions under the same power, and can reduce the need for personnel to enter the silo for operation. At the same time, there are no electrical components in the silo, which can fundamentally solve the problem of electrical dust explosion prevention of the cleaning machine in the grain silo.

[0009] (II) Technical solution

[0010] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0011] The present invention provides a full hydraulic spiral silo cleaning system for grain silos, comprising:

[0012] A screw conveying device is arranged in a grain silo for clearing the grain silo. The screw conveying device is provided with a monitoring component for monitoring the screw driving pressure in the screw conveying device; a hydraulic system is connected to the screw conveying device; and an electric control system is electrically connected to the monitoring component. The electric control system controls the output of the hydraulic system according to the information monitored in real time by the monitoring component to adjust the screw parameters of the screw conveying device, so that the screw conveying device can clear the grain silo according to the screw parameters.

[0013] Preferably, it also includes a revolution propulsion device cooperating with the screw conveying device, the revolution propulsion device is used to drive one side of the screw conveying device to move along a revolution track set in the grain silo; the revolution propulsion device is connected to the hydraulic system, and the hydraulic system is set with a first preset value and a second preset value, wherein the first preset value is greater than the second preset value; when the screw driving pressure monitored by the monitoring component is greater than the first preset value or less than the second preset value, the electronic control system controls the output of the hydraulic system according to the information monitored in real time by the monitoring component to adjust the movement parameters in the revolution propulsion device, so as to cooperate with the screw conveying device to automatically complete the grain clearing operation in the silo.

[0014] Preferably, the electronic control system is also electrically connected to an information collection component; the information collection component is used to collect the running resistance of the screw conveyor in real time; when the information collection component detects that the running resistance of the screw conveyor reaches the hardening degree, the electronic control system controls the hydraulic system to reach a constant power set pressure, and uses formula (1) to obtain the screw parameter, which is the screw speed:

[0015] (1)

[0016] in,

[0017] is the screw speed of the screw conveyor;

[0018] is the screw driving pressure of the screw conveyor;

[0019] Preset pressure for constant power of hydraulic system;

[0020] is the rated speed of the screw conveyor.

[0021] Preferably, the hydraulic system includes a hydraulic variable piston pump, a screw drive motor, a revolution drive motor and an electro-hydraulic proportional multi-way valve; the screw drive motor is connected to the screw conveying device, and the revolution drive motor is connected to the revolution propulsion device; the hydraulic variable piston pump is connected to the inlet end of the electro-hydraulic proportional multi-way valve through a first circuit, and is used to provide an input flow for the electro-hydraulic proportional multi-way valve; the first outlet end of the electro-hydraulic proportional multi-way valve is connected to the screw drive motor through a second circuit to adjust the first input flow of the screw drive motor and obtain the screw parameters of the screw conveying device after adjustment; the second outlet end of the electro-hydraulic proportional multi-way valve is connected to the revolution drive motor through a third circuit to adjust the second input flow of the revolution drive motor and obtain the movement parameters of the revolution propulsion device after adjustment.

[0022] Preferably, the electro-hydraulic proportional multi-way valve includes an input link, at least one screw drive output link and at least one revolution drive output link connected by pipelines; when there is one screw drive output link, the screw drive output link is connected to the screw drive motor through the second circuit; when there are multiple screw drive output links, the screw drive output links are connected in parallel and connected to the screw drive motor through the second circuit; when there is one revolution drive output link, the revolution drive output link is connected to the revolution drive motor through the third circuit; when there are multiple revolution drive output links, the revolution drive output links are connected in parallel and connected to the revolution drive motor through the third circuit; the input link is connected to the hydraulic variable piston pump through the first circuit.

[0023] Preferably, the hydraulic system further comprises a bidirectional buffer overflow valve, and the bidirectional buffer overflow valve is arranged on the second circuit and / or the third circuit.

[0024] Preferably, the monitoring component is a screw-driven pressure sensor, and the screw-driven pressure sensor is arranged on the third circuit.

[0025] Preferably, the hydraulic system further comprises a hydraulic filter and a radiator; the hydraulic filter and the radiator are both connected to the input link via a connecting pipeline.

[0026] Preferably, the spiral drive output unit includes a first pilot control valve, a first multi-way valve core and a first pre-valve pressure compensation valve arranged on the pipeline; and / or the revolution drive output unit includes a second pilot control valve, a second multi-way valve core and a second pre-valve pressure compensation valve arranged on the pipeline; and / or the input unit includes a pilot pressure generating valve, a main overflow valve and a shuttle valve arranged on the pipeline.

[0027] The present invention also provides a full-hydraulic screw automatic clearing control method for grain silos, which adopts the above-mentioned full-hydraulic screw clearing system for grain silos. The method includes a monitoring component collecting the screw driving pressure in the screw conveying device, and transmitting the collected screw driving pressure to the electronic control system; the electronic control system performs calculations based on the acquired collected screw driving pressure to adjust the screw parameters of the screw conveying device.

[0028] Preferably, the fully hydraulic screw cleaning system used for grain silos also includes a revolution propulsion device cooperating with the screw conveying device; the revolution propulsion device is connected to the hydraulic system, and the hydraulic system is set with a first preset value and a second preset value, wherein the first preset value is greater than the second preset value; when the screw drive pressure monitored by the monitoring component is greater than the first preset value or less than the second preset value, the electronic control system performs calculations based on the acquired screw drive pressure to adjust the movement parameters of the revolution propulsion device.

[0029] (III) Beneficial effects

[0030] The beneficial effects of the present invention are:

[0031] The present invention provides a fully hydraulic screw clearing system for grain silos. The electronic control system can control the output of the hydraulic system to adjust the screw parameters of the screw conveying device according to the screw drive pressure information monitored in real time by the monitoring component, so that the screw conveying device can perform clearing operations on the grain silo according to the screw parameters. When the grain in the silo is severely compacted, the screw drive pressure of the screw conveying device increases, the hydraulic system automatically adjusts the output flow, the screw speed decreases, and the torque increases. Under the same power, the driving torque is large and the ability to break the compaction is stronger, which can reduce the number of people entering the silo for operation. At the same time, there are no electrical components in the silo, which can fundamentally solve the electrical dust explosion problem of the clearing machine in the bulk grain silo, and has higher safety. Moreover, when the material is not compacted, the clearing operation can be automatically performed without the need for personnel to enter. The degree of automation and unmanned operation is high, and the labor intensity is reduced.

[0032] The present invention provides a full-hydraulic spiral silo clearing control method for grain silos. Under the same power, the driving torque is large and the ability to break compaction is stronger, which can reduce the number of people entering the silo for operation. At the same time, there are no electrical components in the silo, which can fundamentally solve the problem of electrical dust explosion prevention of the silo clearing machine in the bulk grain silo. The method has higher safety. Moreover, when the material is not compacted, the silo clearing operation can be automatically performed without the need for people to enter. The method has a high degree of automation and unmanned operation, and reduces labor intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a front view of the full hydraulic spiral silo cleaning system for grain silos of the present invention;

[0034] Figure 2 A top view of the fully hydraulic spiral silo cleaning system for grain silos of the present invention;

[0035] Figure 3 for Figure 1 A partial schematic diagram of the

[0036] Figure 4 It is a structural schematic diagram of a hydraulic slip ring;

[0037] Figure 5 is a schematic diagram of an embodiment of a hydraulic system;

[0038] Figure 6 Schematic diagram of another embodiment of a hydraulic system.

[0039] [Description of Reference Numerals]

[0040] 1: head transmission device; 11: transmission shaft; 12: hydraulic slip ring connecting shaft; 13: hydraulic slip ring; 131: fixed part; 132: rotating part; 14: protective cover; 15: universal joint;

[0041] 2: Rotating centering device;

[0042] 3: Screw conveying device;

[0043] 4: Revolution propulsion device;

[0044] 5: orbit;

[0045] 6: Fuselage support device;

[0046] 701: Hydraulic variable piston pump; 702: Screw drive motor; 703: Revolution drive motor; 704: Electro-hydraulic proportional multi-way valve; 705: First circuit; 706: Second circuit; 707: Third circuit; 708: Bidirectional buffer overflow valve; 709: Screw drive pressure sensor; 710: Hydraulic filter; 711: Radiator; 712: First pilot control valve; 713: First multi-way valve core; 714: First valve front pressure compensation valve; 715: Second pilot control valve; 716: Second multi-way valve core; 717: Second valve front pressure compensation valve; 718: Pilot pressure generating valve; 719: Main overflow valve; 720: Shuttle valve; 721: Pump station motor. DETAILED DESCRIPTION

[0047] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0048] Embodiment 1

[0049] like Figure 1-2As shown, the present invention provides a fully hydraulic screw silo cleaning system for grain silos, including a head transmission device 1, a rotation centering device 2, a screw conveying device 3, a revolution propulsion device 4, a revolution track 5, a body support device 6, a hydraulic system and an electric control system.

[0050] The screw conveying device 3 is arranged in the grain silo for clearing the grain silo, wherein the clearing operation includes transporting the grain in the silo or rotating to eliminate the compaction of the grain in the silo when the grain is compacted in the silo. The screw conveying device 3 is provided with a monitoring component for monitoring the screw driving pressure in the screw conveying device 3. The hydraulic system is respectively connected to the screw conveying device 3 and the revolution propulsion device 4, and the electric control system is electrically connected to the monitoring component. The electric control system controls the output of the hydraulic system according to the information monitored in real time by the monitoring component to adjust the screw parameters of the screw conveying device 3, so that the screw conveying device 3 can clear the grain silo according to the screw parameters.

[0051] The revolution propulsion device 4 cooperates with the screw conveyor 3, and the revolution propulsion device 4 is used to drive one side of the screw conveyor 3 to move along the revolution track 5 set in the grain silo. The revolution propulsion device 4 is connected to the hydraulic system, and a first preset value and a second preset value are set in the hydraulic system, wherein the first preset value is greater than the second preset value. When the screw driving pressure monitored by the monitoring component is greater than the first preset value or less than the second preset value, the electronic control system controls the hydraulic system output to adjust the movement parameters in the revolution propulsion device 4 according to the information monitored in real time by the monitoring component, so as to automatically complete the grain clearing operation in the silo in cooperation with the screw conveyor 3.

[0052] like Figure 3 As shown, specifically, the head transmission device 1 includes a transmission shaft 11 and a hydraulic slip ring 13 assembly. The hydraulic slip ring 13 assembly includes a hydraulic slip ring connecting shaft 12 and a hydraulic slip ring 13 connected to the hydraulic slip ring connecting shaft 12, and the lower end of the hydraulic slip ring connecting shaft 12 is connected to the rotating centering device 2. Figure 4 As shown, the hydraulic slip ring 13 includes a fixed portion 131 and a rotating portion 132. The fixed portion 131 of the hydraulic slip ring 13 is connected to the hydraulic slip ring connecting shaft 12, and the rotating portion 132 of the hydraulic slip ring 13 can rotate around the center of the hydraulic slip ring connecting shaft 12 when working. In this embodiment, the fuselage support device 6 is fixedly connected to the screw conveying device 3 by bolts, and the revolution propulsion device 4 is installed on the outside of the screw conveying device 3. A sprocket is installed on the revolution propulsion device 4, and a sprocket hole is machined on the revolution track 5. The movement of the revolution propulsion device 4 on the revolution track 5 is achieved by the engagement between the sprocket and the sprocket hole. The transmission shaft 11 is connected to the screw conveying device 3 through a universal joint 15. In this embodiment, as shown Figure 1 As shown, the spiral of the spiral conveying device 3 adopts two universal joints 15, thereby solving the problem that the center of the transmission shaft 11 of the head transmission device 1 and the spiral center of the spiral conveying device 3 are not concentric.

[0053] The present embodiment provides a fully hydraulic screw clearing system for grain silos. The electronic control system can control the output of the hydraulic system to adjust the screw parameters of the screw conveyor 3 according to the screw drive pressure information monitored in real time by the monitoring component, so that the screw conveyor 3 can clear the grain silo according to the screw parameters. When the grain in the silo is seriously compacted, the screw drive pressure of the screw conveyor 3 increases, the hydraulic system automatically adjusts the output flow, the screw speed decreases, and the torque increases. Under the same power, the driving torque is large and the ability to break the compaction is stronger, which can reduce the number of people entering the silo for operation. At the same time, there are no electrical components in the silo, which can fundamentally solve the electrical dust explosion problem of the clearing machine in the bulk grain silo, and it is safer. Moreover, when the material is not compacted, the clearing operation can be automatically performed without the need for personnel to enter. The degree of automation and unmanned operation is high, and the labor intensity is reduced.

[0054] In actual application, the head transmission device 1 also includes a protective cover 14. When working, the fixed part 131 of the hydraulic slip ring 13 is fixedly connected to the hydraulic slip ring connecting shaft 12, and the protective cover 14, the transmission shaft 11, the universal joint 15, and the rotating part of the hydraulic slip ring 13 rotate in the horizontal direction around the fixed part 131 of the hydraulic slip ring 13 and the center of the hydraulic slip ring connecting shaft 12. The function of the hydraulic slip ring 13 is to prevent all hydraulic pipelines from being entangled together during the rotation process, so that the hydraulic system cannot work normally.

[0055] In actual application, the electric control system is also electrically connected to the information collection component, which is used to collect the running resistance of the screw conveyor 3 in real time. The information collection component determines whether the grain is compacted based on the detected running resistance of the screw conveyor.

[0056] When the information collection component detects that the running resistance of the screw conveyor reaches the degree of hardening, the electronic control system controls the hydraulic system to reach the constant power setting pressure, and the screw parameter is obtained by formula (1). The screw parameter is the screw speed:

[0057] (1)

[0058] in,

[0059] is the screw speed of the screw conveyor;

[0060] is the screw driving pressure of the screw conveyor;

[0061] Preset pressure for constant power of hydraulic system;

[0062] is the rated speed of the screw conveyor.

[0063] like Figure 5-6 As shown, the hydraulic system includes a hydraulic variable piston pump 701, a screw drive motor 702, a revolution drive motor 703 and an electro-hydraulic proportional multi-way valve 704. The screw drive motor 702 is connected to the screw conveying device 3 to provide power for the screw conveying device 3, and the revolution drive motor 703 is connected to the revolution propulsion device 4 to provide power for the revolution propulsion device 4. The hydraulic variable piston pump 701 is connected to the inlet end of the electro-hydraulic proportional multi-way valve 704 through the first circuit 705, which is used to provide input flow for the electro-hydraulic proportional multi-way valve 704. The first outlet end of the electro-hydraulic proportional multi-way valve 704 is connected to the screw drive motor 702 through the second circuit 706 to adjust the first input flow of the screw drive motor 702, thereby controlling the screw speed of the screw conveying device 3. The second outlet end of the electro-hydraulic proportional multi-way valve 704 is connected to the revolution drive motor 703 through the third circuit 707 to adjust the second input flow of the revolution drive motor 703, thereby controlling the moving speed of the revolution propulsion device 4. In this embodiment, the monitoring component is a screw drive pressure sensor 709 disposed on the second circuit 706 .

[0064] Among them, the hydraulic variable piston pump 701 has load sensitivity, constant power function and pressure cut-off function. The load sensitivity function ensures that the pressure difference between the pump port output pressure of the hydraulic variable piston pump 701 and the load sensitive pressure feedback by the electro-hydraulic proportional multi-way valve 704 remains unchanged, thereby automatically adjusting the flow output to ensure efficient operation of the hydraulic system.

[0065] The constant power function ensures that when the working resistance of the screw is large, the hydraulic variable piston pump 701 automatically increases the working pressure, reduces the flow, increases the torque, reduces the speed, and improves the driving capacity of the screw conveying device 3 under the condition of unchanged working power. When the working resistance decreases, the hydraulic piston pump reduces the working pressure, increases the flow, reduces the torque, increases the speed, and improves the conveying capacity of the screw drive conveying device. When the system pressure reaches the rated working pressure, the flow output of the hydraulic variable piston pump 701 is basically zero, protecting the hydraulic components, which is more energy-efficient than the overflow valve protection method.

[0066] In this embodiment, the electro-hydraulic proportional multi-way valve 704 includes an input link, at least one screw drive output link, and at least one revolution drive output link connected through a pipeline. Figure 5 As shown, when there is one spiral drive output link, the spiral drive output link is connected to the spiral drive motor 702 through the second circuit 706. When there are multiple spiral drive output links, the spiral drive output links are connected in parallel and connected to the spiral drive motor 702 through the second circuit 706. Figure 6Two spiral drive output couplers are shown in FIG. 1 . It should be noted that in this embodiment, the number of spiral drive output couplers is set according to actual needs. The spiral drive output coupler is connected to the spiral drive motor 702 through the second loop 706 and is used to control the speed and rotation direction of the spiral drive motor 702 .

[0067] The spiral drive output link includes a first pilot control valve 712, a first multi-way valve core 713 and a first valve front pressure compensation valve 714 arranged on the pipeline. The first pilot control valve 712 includes two proportional pressure reducing valves for controlling the displacement of the first multi-way valve core 713, thereby controlling the forward and reverse rotation and speed of the spiral drive motor 702. The first valve front pressure compensation valve 714 is used to ensure that the pressure before and after the spiral drive output link valve in the electro-hydraulic proportional multi-way valve 704 is constant, so that the flow control of the rotary drive output link is stable. It should be noted that in this embodiment, the pipeline includes a plurality of connected branch pipelines, and each valve is arranged on the branch pipeline. In this embodiment, the specific connection relationship of the branch pipeline is not limited as long as its function can be realized.

[0068] In actual application, the hydraulic system also includes a two-way buffer relief valve 708 and a pump station motor 721. The two-way buffer relief valve 708 is arranged on the second circuit 706 and / or the third circuit 707. When the screw drive motor 702 encounters a transient large load exceeding the rated pressure, the two-way buffer relief valve 708 opens to release the high-pressure oil for protection to prevent overload of the screw drive-related hydraulic components.

[0069] When the screw conveying device 3 is rotating, if the pressure value monitored by the screw drive pressure sensor 709 is too low, it is considered that the hydraulic pipeline has burst, the pump station motor 721 is powered off, and the system stops working.

[0070] It should be noted that, in this embodiment, the number of revolution drive output links is set according to actual needs. When there is one revolution drive output link, the revolution drive output link is connected to the revolution drive motor 703 through the third circuit 707. When there are multiple revolution drive output links, the revolution drive output links are connected in parallel and connected to the revolution drive motor 703 through the third circuit 707. Among them, the revolution drive output link is connected to the revolution drive motor 703 through the third circuit 707, which is used to control the speed and rotation direction of the revolution drive motor 703. The revolution drive output link includes a second pilot control valve 715, a second multi-way valve core 716 and a second valve front pressure compensation valve 717 arranged on the pipeline. The second pilot control valve 715 is composed of two proportional pressure reducing valves, which are used to control the displacement of the second multi-way valve core 716, and then control the forward and reverse rotation and speed of the revolution drive motor 703. The second valve front pressure compensation valve 717 is used to ensure that the pressure before and after the second valve in the electro-hydraulic proportional multi-way valve 704 is constant, so that the flow control of the revolution drive output link is stable.

[0071] The input link is connected to the hydraulic variable piston pump 701 through the first circuit 705, and is used to provide input flow for the electro-hydraulic proportional multi-way valve 704. The input link includes a pilot pressure generating valve 718, a main relief valve 719 and a shuttle valve 720 arranged on the pipeline. The pilot pressure generating valve 718 is used to generate pilot control high-pressure oil, wherein the high-pressure oil of the first pilot control valve 712 and the second pilot control valve 715 are both provided by the pilot pressure generating valve 718. The set pressure of the main relief valve 719 is higher than the pressure cut-off set pressure of the hydraulic variable piston pump 701, ensuring that when the pressure cut-off function fails, the hydraulic system can be prevented from being overloaded. The shuttle valve 720 is used to compare the load-sensitive system oil pressures of the spiral drive output link and the revolution drive output link in the electro-hydraulic proportional multi-way valve 704, and feed back the compared highest pressure to the load-sensitive oil port of the hydraulic variable piston pump 701, so as to adjust the flow of the hydraulic variable piston pump 701.

[0072] Preferably, the hydraulic system further includes a hydraulic filter 710 and a radiator 711, both of which are connected to the input connection through a connecting pipeline. The hydraulic filter 710 is used to filter impurities in the hydraulic oil in the pipeline to protect the hydraulic components. The radiator 711 is used to cool the hydraulic oil to prevent excessive heat in the system.

[0073] Embodiment 2:

[0074] This embodiment provides a full hydraulic screw automatic clearing control method for grain silos, using the full hydraulic screw clearing system for grain silos in embodiment 1. The method includes:

[0075] The monitoring component collects the screw driving pressure in the screw conveying device 3 and transmits the collected screw driving pressure to the electronic control system. The electronic control system performs calculations based on the obtained screw driving pressure to adjust the screw parameters of the screw conveying device 3.

[0076] The information collection component determines whether the grain is compacted according to the running resistance of the screw conveying device 3 detected. When it is detected that the material in the grain silo is not compacted, the hydraulic system has not reached the constant power setting pressure, and the electric control system outputs a driving current proportionally to control the output pressure of the first pilot control valve 712. The output pressure of the first pilot control valve 712 proportionally controls the output flow of the first multi-way valve core 713. The output flow of the first multi-way valve core 713 proportionally controls the screw drive motor 702 to control the speed of the screw conveying device 3. That is, the screw parameter is obtained by using formula (2), and the screw parameter is the screw speed;

[0077] (2)

[0078] in,

[0079] is the screw speed of the screw conveyor;

[0080] Output driving current for the electronic control system;

[0081] The dead zone current of the spiral drive connection of the electro-hydraulic proportional multi-way valve;

[0082] Connect the dead zone current to the spiral drive of the electro-hydraulic proportional multi-way valve;

[0083] Rated drive current of the spiral drive link of the electro-hydraulic proportional multi-way valve;

[0084] is the rated speed of the screw conveyor.

[0085] And the first preset value and the second preset value are set in the hydraulic system, wherein the first preset value is greater than the second preset value. When the screw drive pressure monitored by the monitoring component is greater than the first preset value or less than the second preset value, the electronic control system performs calculations based on the acquired screw drive pressure to adjust the movement parameters of the revolution propulsion device. When the information collection component detects that the material in the grain silo is not compacted, the revolution propulsion device 4 is controlled according to the screw drive pressure of the screw drive motor 702. When the actual screw drive pressure of the screw drive motor 702 is higher than the set first preset pressure, it indicates that there is more material in the screw conveying device 3. The hydraulic system controls the revolution drive motor 703 to stop, and the screw drive motor 702 rotates at the rated speed. When the actual screw drive pressure of the screw drive motor 702 is lower than the second preset pressure, it indicates that there is less material in the screw conveying device 3. The hydraulic system controls the revolution drive motor 703 to move forward, and the speed of the screw drive motor 702 is reduced. In this embodiment, the first preset value is 11Mpa and the second preset value is 7Mpa.

[0086] When the information collection component detects that the material in the grain silo is compacted, the electronic control system controls the hydraulic system to reach a constant power set pressure, and uses formula (1) to obtain the spiral parameter, which is the spiral speed:

[0087] (1)

[0088] in,

[0089] is the screw speed of the screw conveyor;

[0090] is the screw driving pressure of the screw conveyor;

[0091] Preset pressure for constant power of hydraulic system;

[0092] is the rated speed of the screw conveyor.

[0093] The present embodiment provides a fully hydraulic screw clearing system for grain silos. The electronic control system can control the output of the hydraulic system to adjust the screw parameters of the screw conveyor 3 according to the screw drive pressure information monitored in real time by the monitoring component, so that the screw conveyor 3 can clear the grain silo according to the screw parameters. When the grain in the silo is seriously compacted, the screw drive pressure of the screw conveyor 3 increases, the hydraulic system automatically adjusts the output flow, the screw speed decreases, and the torque increases. Under the same power, the driving torque is large and the ability to break the compaction is stronger, which can reduce the number of people entering the silo for operation. At the same time, there are no electrical components in the silo, which can fundamentally solve the electrical dust explosion problem of the clearing machine in the bulk grain silo, and it is safer. Moreover, when the material is not compacted, the clearing operation can be automatically performed without the need for personnel to enter. The degree of automation and unmanned operation is high, and the labor intensity is reduced.

[0094] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0095] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0096] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0097] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0098] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A fully hydraulic screw cleaning system for grain silos, characterized in that: include: A screw conveying device is arranged in a grain silo for clearing the grain silo, and a monitoring component for monitoring the screw driving pressure in the screw conveying device is arranged in the screw conveying device; A revolution propulsion device, cooperating with the screw conveying device; A hydraulic system connected to the screw conveying device; The hydraulic system includes a hydraulic variable piston pump, a screw drive motor, a revolution drive motor and an electro-hydraulic proportional multi-way valve; the screw drive motor is connected to the screw conveying device, and the revolution drive motor is connected to the revolution propulsion device; the hydraulic variable piston pump is connected to the inlet end of the electro-hydraulic proportional multi-way valve through a first circuit, and is used to provide an input flow for the electro-hydraulic proportional multi-way valve; the first outlet end of the electro-hydraulic proportional multi-way valve is connected to the screw drive motor through a second circuit to adjust the first input flow of the screw drive motor and obtain the screw parameters of the screw conveying device after adjustment; the second outlet end of the electro-hydraulic proportional multi-way valve is connected to the revolution drive motor through a third circuit to adjust the second input flow of the revolution drive motor and obtain the movement parameters of the revolution propulsion device after adjustment; The monitoring component is a screw-driven pressure sensor, and the screw-driven pressure sensor is arranged on the second circuit; An electric control system is electrically connected to the monitoring component. The electric control system controls the output of the hydraulic system to adjust the screw parameters of the screw conveying device according to the information monitored in real time by the monitoring component, so that the screw conveying device can clear the grain silo according to the screw parameters. When the screw driving pressure of the screw conveying device increases due to the compaction of grain in the grain silo, the hydraulic system automatically adjusts the output flow rate to reduce the screw speed of the screw conveying device and increase the torque.

2. The fully hydraulic spiral silo cleaning system for grain silos according to claim 1, characterized in that: The revolution propulsion device is used to drive one side of the screw conveying device to move along the revolution track set in the grain silo; The revolution propulsion device is connected to the hydraulic system, and the hydraulic system is set with a first preset value and a second preset value, wherein the first preset value is greater than the second preset value; When the screw drive pressure monitored by the monitoring component is greater than the first preset value or less than the second preset value, the electronic control system controls the hydraulic system output according to the information monitored in real time by the monitoring component to adjust the movement parameters in the revolution propulsion device to cooperate with the screw conveying device to automatically complete the grain clearing operation in the grain silo.

3. The fully hydraulic spiral silo cleaning system for grain silos according to claim 2, characterized in that: The electric control system is also electrically connected to an information collection component; the information collection component is used to collect the running resistance of the screw conveying device in real time; When the information collection component detects that the running resistance of the screw conveying device reaches the degree of hardening, the electronic control system controls the hydraulic system to reach the constant power setting pressure, and uses formula (1) to obtain the screw parameter, which is the screw speed: （1） in, is the screw speed of the screw conveyor; is the screw driving pressure of the screw conveyor; Preset pressure for constant power of hydraulic system; is the rated speed of the screw conveyor.

4. The fully hydraulic screw cleaning system for grain silos according to claim 1, characterized in that: The electro-hydraulic proportional multi-way valve comprises an input link, at least one screw drive output link and at least one revolution drive output link connected by a pipeline; When there is one screw drive output link, the screw drive output link is connected to the screw drive motor through the second circuit; When there are multiple screw drive output links, the screw drive output links are connected in parallel and communicate with the screw drive motor through the second circuit; When there is one revolution drive output link, the revolution drive output link is connected to the revolution drive motor through the third circuit; When there are multiple revolution drive output links, the revolution drive output links are connected in parallel and communicated with the revolution drive motor through the third circuit; The input link is in communication with the hydraulic variable piston pump through the first circuit.

5. The fully hydraulic screw cleaning system for grain silos according to claim 4, characterized in that: The hydraulic system further comprises a bidirectional buffer overflow valve, and the bidirectional buffer overflow valve is arranged on the second circuit and / or the third circuit.

6. The fully hydraulic screw cleaning system for grain silos according to claim 4, characterized in that: The hydraulic system also includes a hydraulic filter and a radiator; The hydraulic filter and the radiator are both connected to the input tube via connecting pipes.

7. The fully hydraulic screw cleaning system for grain silos according to claim 4, characterized in that: The spiral drive output link includes a first pilot control valve, a first multi-way valve core and a first pre-valve pressure compensation valve arranged on the pipeline; And / or the revolution drive output link includes a second pilot control valve, a second multi-way valve core and a second pre-valve pressure compensation valve arranged on the pipeline; And / or the input link includes a pilot pressure generating valve, a main relief valve and a shuttle valve arranged on the pipeline.

8. A fully hydraulic spiral automatic clearing control method for grain silos, characterized in that: Using the fully hydraulic screw clearing system for grain silos according to any one of claims 1 to 7, the method comprises: The monitoring component collects the screw driving pressure in the screw conveying device and transmits the collected screw driving pressure to the electronic control system; The electronic control system performs calculations based on the acquired screw driving pressure to adjust the screw parameters of the screw conveying device.

9. The fully hydraulic spiral automatic silo clearing control method for grain silos according to claim 8, characterized in that: The fully hydraulic screw silo cleaning system used for grain silos also includes a revolution propulsion device cooperating with the screw conveying device; The revolution propulsion device is connected to the hydraulic system, and the hydraulic system is set with a first preset value and a second preset value, wherein the first preset value is greater than the second preset value; When the screw drive pressure monitored by the monitoring component is greater than the first preset value or less than the second preset value, the electronic control system performs calculations based on the acquired screw drive pressure to adjust the movement parameters of the revolution propulsion device.

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