Sand transportation control system and control method

Abstract

The present invention provides a sand transportation control system and a control method. The sand transportation control system includes a gate cylinder, a discharge turning cylinder, and a lifting cylinder. The sand transportation control system further includes: an oil liquid circulation circuit, with both ends of the oil liquid circulation circuit communicating with an oil tank; a first multi-way valve connected to the gate cylinder; a second multi-way valve connected to the discharge turning cylinder; a third multi-way valve connected to the lifting cylinder; wherein the first multi-way valve, the second multi-way valve, and the third multi-way valve are all arranged on the oil liquid circulation circuit, the first multi-way valve and the third multi-way valve are arranged in parallel, and the first multi-way valve and the second multi-way valve are arranged in series. The present invention solves the problem of unstable control system of the existing sand transportation equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum machinery, and in particular, to a sand transportation control system and a control method thereof. Background Art

[0002] During the process of oil extraction, the fracturing technology is usually used to increase the oil well output, resulting in an increasing demand for sand volume in domestic fracturing operations.

[0003] In the existing sand storage equipment, the power equipment of the sand transportation mechanism is mostly electrically driven or hydraulically driven. When electrically driven, the stability of the equipment performance is insufficient and the power consumption increases. When the control mode of combining hydraulic cylinders with proportional valves is adopted, when one side of the equipment is at a high temperature, the oil temperatures in the two cylinders are inconsistent. The volume of the hydraulic oil will cause the extension lengths of the cylinders to be different due to the temperature rise, resulting in the extended bin bodies not being at the same height, and the mechanical structure will also be deformed and jammed, leading to equipment failures. Summary of the Invention

[0004] The main object of the present invention is to provide a sand transportation control system and a control method thereof to solve the problem of unstable control system of the existing sand transportation equipment.

[0005] To achieve the above object, according to one aspect of the present invention, there is provided a sand transportation control system, including a gate cylinder, a discharging and turning cylinder, and a lifting cylinder. The sand transportation control system further includes: an oil liquid circulation circuit, both ends of the oil liquid circulation circuit are communicated with an oil tank; a first multi-way valve, the first multi-way valve is connected to the gate cylinder; a second multi-way valve, the second multi-way valve is connected to the discharging and turning cylinder; a third multi-way valve, the third multi-way valve is connected to the lifting cylinder; wherein, the first multi-way valve, the second multi-way valve, and the third multi-way valve are all arranged on the oil liquid circulation circuit, the first multi-way valve and the third multi-way valve are arranged in parallel, and the first multi-way valve and the second multi-way valve are arranged in series.

[0006] Further, both the first multi-way valve and the third multi-way valve are closed centers, and the second multi-way valve is an open center.

[0007] Further, the oil liquid circulation circuit includes: an oil outlet main circuit, which is communicated with the oil outlet of the oil tank; a first branch circuit, the inlet end of the first branch circuit is communicated with the oil outlet main circuit, the outlet end of the first branch circuit is communicated with the oil tank, and both the first multi-way valve and the second multi-way valve are arranged on the first branch circuit; a second branch circuit, which is arranged in parallel with the first branch circuit, the third multi-way valve is arranged on the second branch circuit, and both ends of the second branch circuit are respectively communicated with the oil outlet main circuit and the oil tank.

[0008] Further, the sand transportation control system further includes: a first control valve, which is arranged on the first branch circuit, and the on-off of the first branch circuit is controlled by the first control valve.

[0009] Further, a control handle is provided on the first multi-way valve, and the oil circulation circuit further includes: an oil outlet branch, the first end of the oil outlet branch is communicated with the first multi-way valve, and the second end of the oil outlet branch is communicated with the fuel tank. By moving the control handle, the oil in the first multi-way valve is controlled to flow out from the first branch or the oil outlet branch.

[0010] Further, the oil circulation circuit further includes: a main oil return path, the oil outlet end of the oil outlet branch and the oil outlet end of the third multi-way valve are both communicated with the oil inlet of the main oil return path, and the oil outlet of the main oil return path is communicated with the fuel tank.

[0011] Further, the main oil return path further includes: a first oil return branch and a second oil return branch arranged in parallel; the sand transportation control system further includes: a one-way valve arranged on the first oil return branch; a temperature detection component arranged on the second oil return branch; a radiator arranged on the second oil return branch.

[0012] Further, the sand transportation control system further includes: an oil outlet filter and a pump body, which are sequentially arranged on the main oil outlet path along the flow direction of the oil; an oil return filter arranged on the main oil return path.

[0013] Further, the sand transportation control system further includes: a pressure monitoring component arranged on and connected to the third multi-way valve, and the pressure in the third multi-way valve is monitored through the pressure monitoring component.

[0014] According to another aspect of the present invention, a control method is provided, which is applicable to the above sand transportation control system. The control method includes: S10: controlling the third multi-way valve to open to control the lifting cylinder to drive the sand storage bin to extend; S20: controlling the second multi-way valve to open to control the discharge turning cylinder to drive the discharge hopper on the sand storage bin to move to a predetermined discharge position; S30: according to the preset sand output, the first multi-way valve is opened to control the gate cylinder to drive the gate to open to a predetermined sand output position.

[0015] Applying the technical solution of the present invention, the sand transportation control system includes a gate cylinder, a discharge turning cylinder and a lifting cylinder. The sand transportation control system further includes: an oil circulation circuit, and both ends of the oil circulation circuit are communicated with the fuel tank; the first multi-way valve, the second multi-way valve and the third multi-way valve are all arranged on the oil circulation circuit, the first multi-way valve is connected to the gate cylinder; the second multi-way valve is connected to the discharge turning cylinder; the third multi-way valve is connected to the lifting cylinder; the first multi-way valve and the third multi-way valve are arranged in parallel, and the first multi-way valve and the second multi-way valve are arranged in series. In this way, when the lifting cylinder finishes working, the gate cylinder and the discharge turning cylinder work. When the system is started and no actuator is operated, the hydraulic oil in the fuel tank will directly return to the fuel tank through the first multi-way valve and the second multi-way valve, and the system pressure is only the loss pressure in the oil circulation circuit, the system is unloaded, and the power loss in the sand transportation control system is reduced. Description of the Drawings

[0016] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0017] Figure 1 shows a schematic structural diagram of a sand transportation control system in the prior art;

[0018] Figure 2 shows a schematic structural diagram of an embodiment of a sand transportation control system according to the present invention; and

[0019] Figure 3 shows a control flow chart of a control method according to the present invention.

[0020] Among them, the above-mentioned drawings include the following reference numerals:

[0021] 100, gate cylinder; 200, discharge turning cylinder; 300, lifting cylinder; 4, oil circulation circuit; 5, fuel tank; 1, first multi-way valve; 2, second multi-way valve; 3, third multi-way valve; 40, main oil outlet path; 401, second control valve; 41, first branch; 42, second branch; 6, first control valve; 43, oil outlet branch; 44, main oil return path; 45, first oil return branch; 46, second oil return branch; 450, check valve; 460, temperature detection component; 461, radiator; 7, oil outlet filter; 8, pump body; 9, oil return filter; 30, pressure monitoring component. Detailed Embodiments

[0022] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0023] Please refer to Figure 2 , the present invention provides a sand transportation control system, including a gate cylinder 100, a discharge turning cylinder 200 and a lifting cylinder 300. The sand transportation control system further includes: an oil circulation circuit 4, both ends of the oil circulation circuit 4 are communicated with a fuel tank 5; a first multi-way valve 1, the first multi-way valve 1 is connected to the gate cylinder 100; a second multi-way valve 2, the second multi-way valve 2 is connected to the discharge turning cylinder 200; a third multi-way valve 3, the third multi-way valve 3 is connected to the lifting cylinder 300; wherein, the first multi-way valve 1, the second multi-way valve 2 and the third multi-way valve 3 are all arranged on the oil circulation circuit 4, the first multi-way valve 1 and the third multi-way valve 3 are arranged in parallel, and the first multi-way valve 1 and the second multi-way valve 2 are arranged in series.

[0024] The present invention provides a sand transportation control system, which includes a gate cylinder 100, a discharging and tipping cylinder 200, and a lifting cylinder 300. The sand transportation control system further includes: an oil circulation circuit 4, with both ends of the oil circulation circuit 4 communicating with an oil tank 5 respectively; a first multi-way valve 1, a second multi-way valve 2, and a third multi-way valve 3 are all arranged on the oil circulation circuit 4. The first multi-way valve 1 is connected to the gate cylinder 100; the second multi-way valve 2 is connected to the discharging and tipping cylinder 200; the third multi-way valve 3 is connected to the lifting cylinder 300; the first multi-way valve 1 and the third multi-way valve 3 are arranged in parallel, and the first multi-way valve 1 and the second multi-way valve 2 are arranged in series. In this way, after the lifting cylinder 300 finishes working, the gate cylinder 100 and the discharging and tipping cylinder 200 work. When the system is started and no actuator is operated, the hydraulic oil in the oil tank 5 will directly return to the oil tank through the first multi-way valve 1 and the second multi-way valve 2. The system pressure is only the loss pressure in the oil circulation circuit 4, and the system is unloaded, reducing the power loss in the sand transportation control system.

[0025] Specifically, both the first multi-way valve 1 and the third multi-way valve 3 are closed-center, and the second multi-way valve 2 is open-center. Here, it should be noted that a closed-center means that when the control handle is in the middle position, the hydraulic oil cannot directly return to the oil tank. Only when the control handle is in the left position or the right position to control the actuator to act, the hydraulic oil will return to the oil tank from the oil return port, avoiding the situation that any open-center multi-way valve allows the hydraulic oil to directly run back to the oil tank when the actuator does not act, and the oil pressure cannot be established to make the load act; an open-center means that when the multi-way valve is in the middle position and not working, the hydraulic oil can directly return to the oil tank through each valve stem, and each valve stem is the same as the oil inlet and the oil outlet; therefore, by setting the first multi-way valve 1 as a closed-center and the second multi-way valve 2 as an open-center, when there is no actuator action in the system, the hydraulic oil can directly return to the oil tank without overflowing for heat dissipation.

[0026] In specific implementation, the oil circulation circuit 4 includes: an oil outlet main path 40, communicating with the oil outlet of the oil tank 5; a first branch path 41, the inlet end of the first branch path 41 communicates with the oil outlet main path 40, and the outlet end of the first branch path 41 communicates with the oil tank 5. The first multi-way valve 1 and the second multi-way valve 2 are both arranged on the first branch path 41; a second branch path 42, arranged in parallel with the first branch path 41, the third multi-way valve 3 is arranged on the second branch path 42, and both ends of the second branch path 42 communicate with the oil outlet main path 40 and the oil tank 5 respectively.

[0027] Among them, the sand transportation control system further includes: a first control valve 6, arranged on the first branch path 41, and the on-off of the first branch path 41 is controlled through the first control valve 6. Preferably, the first control valve 6 is a two-position two-way solenoid valve. When the solenoid valve is powered on, the hydraulic oil cannot enter the first multi-way valve 1 to return to the oil tank, and can only return to the oil tank through the third multi-way valve 3 on the second branch path 42, or overflow back to the oil tank after reaching the pressure of the overflow valve.

[0028] In this application, a control handle is provided on the first multi-way valve 1. The oil circulation circuit 4 further includes: an oil outlet branch 43, the first end of the oil outlet branch 43 is communicated with the first multi-way valve 1, and the second end of the oil outlet branch 43 is communicated with the fuel tank 5. By moving the control handle, the oil in the first multi-way valve 1 is controlled to flow out through the first branch 41 or the oil outlet branch 43. Among them, the second multi-way valve 2 and the third multi-way valve 3 are respectively provided with a first control component and a second control component. The first multi-way valve 1 is a closed-center cross multi-way valve, and high-pressure oil can reach the second multi-way valve 2 through the first multi-way valve 1 to drive hydraulic components. When the control handle is in the middle position, the hydraulic oil can only pass through the first branch 41. When the control handle is in the left position or the right position, the hydraulic oil can only return to the fuel tank through the oil outlet branch 43; the second multi-way valve 2 is an open-center multi-way valve. No matter whether the second control component is in the middle position, the left position or the right position, the hydraulic oil can return to the fuel tank through the first branch 41.

[0029] Further, the oil circulation circuit 4 further includes: an oil return main path 44. The oil outlet end of the oil outlet branch 43 and the oil outlet end of the third multi-way valve 3 are both communicated with the oil inlet of the oil return main path 44, and the oil outlet of the oil return main path 44 is communicated with the fuel tank 5. The hydraulic oil in the oil outlet branch 43 and the second branch 42 is collected through the oil return main path 44 to return to the fuel tank.

[0030] In the specific implementation process, the oil return main path 44 further includes: a first oil return branch 45 and a second oil return branch 46 arranged in parallel; the sand transportation control system further includes: a one-way valve 450 arranged on the first oil return branch 45; a temperature detection component 460 arranged on the second oil return branch 46; a radiator 461 arranged on the second oil return branch 46. Preferably, the temperature detection component 460 is a temperature sensor, and the radiator 461 is driven by a motor. When the oil temperature is low, through the programming control of the electronic control module, the driving motor of the radiator 461 does not operate, and the hydraulic oil returns to the fuel tank directly without heat dissipation. The one-way valve 450 plays a role in protecting the radiator 461. When the temperature is low in winter and the viscosity of the hydraulic oil is large, resulting in a large pressure difference in the pipeline, the one-way valve opens, and the hydraulic oil returns to the fuel tank through the one-way valve, avoiding the situation of damage to the hydraulic oil radiator caused by excessive pressure difference.

[0031] Among them, the sand transportation control system further includes: an oil outlet filter 7 and a pump body 8. Along the flow direction of the oil, the oil outlet filter 7 and the pump body 8 are sequentially arranged on the oil outlet main path 40; an oil return filter 9 is arranged on the oil return main path 44. The oil in the oil outlet main path 40 and the oil return main path 44 is filtered by the oil outlet filter 7 and the oil return filter 9 respectively.

[0032] The sand transportation control system further includes: a pressure monitoring component 30, which is arranged on the third multi-way valve 3 and connected to the third multi-way valve 3, and the pressure in the third multi-way valve 3 is monitored through the pressure monitoring component 30. Preferably, the pressure monitoring component 30 is a pressure gauge.

[0033] In the present application, a second control valve 401 is further provided on the main oil outlet path 40, and the second control valve 401 is preferably a butterfly valve.

[0034] In the process of specific implementation, the first control valve 6 is in the normally open state, and hydraulic oil can always pass through. In the closed state, the hydraulic oil flows to the second branch 42.

[0035] A displacement sensor and a two-way hydraulic lock are provided on the gate cylinder 100. The displacement sensor is used to detect the gate opening in real time and control the amount of sand fed. The two-way hydraulic lock can ensure that the position of the cylinder does not change with external forces. The lifting cylinder 300 is a single-stage or two-stage cylinder. The cylinder rod is equipped with a single-stage or two-stage displacement sensor and a balance valve. The displacement sensor can detect the extension length of each cylinder rod and cooperate with the solenoid valve on the multi-way valve for logic control to ensure that all cylinders can still rise or fall synchronously even under the condition of large temperature differences. Moreover, the two-stage cylinder can extend two-stage cylinder rods to push out two layers of bin bodies, which is three times the sand storage capacity when there is no lifting cylinder, greatly increasing the sand storage capacity. The balance valve on the cylinder can avoid the situation of stalling due to the self-weight of the cylinder dropping.

[0036] A two-way balance valve is provided on the discharge tipping cylinder 200 to avoid the situation of unstable stalling of the cylinder caused by the continuous change of the force on the cylinder when the discharge hopper rises or falls.

[0037] As Figure 3 shown, the present invention further provides a control method applicable to the sand transportation control system of the above embodiments. The control method includes: S10: Control the third multi-way valve 3 to open to control the lifting cylinder 300 to drive the sand storage bin to extend; S20: Control the second multi-way valve 2 to open to control the discharge tipping cylinder to drive the discharge hopper on the sand storage bin to move to a predetermined discharge position; S30: According to the preset sand output, the first multi-way valve 1 is opened to control the gate cylinder 100 to drive the gate to open to a predetermined sand output position.

[0038] During specific implementation, a hydraulic pump is provided on the main oil outlet path 40, and the drive motor of the hydraulic pump is started. First, do not operate any actuators (i.e., the gate cylinder 100, the discharge tipping cylinder 200, and the lifting cylinder 300). The hydraulic oil will pass through the two-position two-way solenoid valve (the first control valve 6 in the above embodiment), the first multi-way valve 1, and the second multi-way valve 2 and directly return to the fuel tank under the action of the hydraulic pump. The system pressure is only the pressure loss in the pipeline, and the system is unloaded, so the motor can be started smoothly.

[0039] Extend the bin body of the inner two layers. Through programming of the electronic control module, the electro-hydraulic proportional valve on the third multi-way valve 3 is linked with the two-position two-way solenoid valve, that is, once the third multi-way valve 3 is controlled, the two-position two-way solenoid valve is in the powered-on state, so that the forward hydraulic oil cannot pass through, that is, the hydraulic oil cannot enter the first multi-way valve 1 and the second multi-way valve 2 and directly return to the fuel tank, but can only return to the fuel tank through the oil return circuit of the lifting cylinder 300, or overflow back to the fuel tank after reaching the pressure of the relief valve. And the control signal magnitudes of the respective electro-hydraulic proportional valves are associated with the displacement sensor signals of the secondary cylinders through the logic control of the electronic control module, ensuring that the lengths of all cylinders extending and retracting are always kept consistent and are not affected by the ambient temperature.

[0040] After the sand storage bin is filled with sand, adjust the discharging and tilting cylinder 200. Manually control the second multi-way valve 2 to adjust the lifting of the discharging and tilting cylinder 200 until the appropriate height. At this time, the third multi-way valve 3 does not act, and the two-position two-way solenoid valve is not associated with the third multi-way valve. Therefore, the two-position two-way solenoid valve is not powered on and is in the normally open state. The hydraulic oil reaches the discharging and tilting cylinder 200 after passing through the two-position two-way solenoid valve, the first multi-way valve 1 and the second multi-way valve 2. At this time, the maximum pressure of the system is limited by the second multi-way valve 2, and only when the system is over-pressurized, the hydraulic oil will overflow back to the fuel tank through the relief valve on the second multi-way valve 2.

[0041] The motor drives the sand conveying mechanism to rotate, and the rotating sand conveying mechanism can convey the sand falling from the sand storage tank through the gate valve to the discharging and tilting port.

[0042] Open the gate plates of each sand storage bin, and control the sand discharge amount through the stroke of the gate cylinder 100. Remotely control the oil inlet amount of the gate cylinder 100 through the solenoid valve on the first multi-way valve 1. According to the displacement signal fed back by the displacement sensor on the gate cylinder and the required sand discharge amount, perform arithmetic comparison through the electronic control module to adjust the on-off time of the solenoid valve, that is, the adjustment of the cylinder stroke. The throttle valve in front of the gate cylinder adjusts the operating speed of the cylinder by restricting the oil inlet flow. When the solenoid valve on the first multi-way valve 1 fails, manual control can be carried out by pushing the handle. At this time, since the two-position two-way solenoid valve is only linked with the electro-hydraulic proportional valve on the third multi-way valve 3, the two-position two-way solenoid valve is not powered on when operating the first multi-way valve 1, and the hydraulic oil can reach the gate cylinder 100 through the first multi-way valve 1.

[0043] After the operation is completed, first close the gate cylinder, turn off the motor that drives the sand conveying mechanism to rotate, then adjust the discharging and tilting cylinder until the cylinder rod is completely retracted, so that the overall structure of the equipment occupies less space and is convenient for equipment transportation. Finally, retract the lifting cylinder and then turn off the motor of the driving oil pump.

[0044] Applying the sand conveying control system and control method in this application has the following advantages:

[0045] 1. A method of programming and controlling the lifting cylinder by integrating an electro-hydraulic proportional valve on the third multi-way valve 3 and cooperating with the data signal feedback from the displacement sensor on the cylinder, which avoids the influence of the external temperature change on the volume of the hydraulic oil in the cylinder, enabling the equipment to maintain synchronous lifting and lowering even when using more groups of hydraulic cylinders simultaneously and with a greater extending stroke of the cylinder rod.

[0046] 2. A method of integrating a displacement sensor for detecting the extending length of the cylinder rod on the secondary cylinder, enabling the equipment to extend two layers of internal bins. When the sand storage equipment is convenient for transportation in terms of size, it greatly increases the sand storage capacity of the equipment, can better meet the requirements of large sand volume in the fracturing process, and occupies a smaller area at the operation site. It is also possible to increase the sand storage capacity by assembling a second-layer sand storage bin that can extend the internal bin on the upper part of the first-layer sand storage bin through mechanical connection on the first-layer sand storage bin.

[0047] 3. A method of integrating a relief valve on the third multi-way valve 3 to limit the maximum system pressure and protect the entire hydraulic system from component damage due to overpressure. Since a relief valve is integrated on the third multi-way valve 3, there is no need to install a relief valve on the pipeline, saving installation space.

[0048] 4. The interlocking control of the electro-hydraulic proportional valve and the two-position two-way solenoid valve on the third multi-way valve 3 ensures that when the lifting cylinder 300 operates, the hydraulic oil will not flow back to the fuel tank through the two-position two-way solenoid valve; it also enables the hydraulic oil to control the gate cylinder 100 and the discharge tipping cylinder 200 in the first multi-way valve 1 and the second multi-way valve 2 when the lifting cylinder 300 does not operate, and can limit the maximum system pressure and protect the hydraulic system when the gate cylinder 100 and the discharge tipping cylinder 200 operate. When all the actuators do not operate, the hydraulic oil can directly return to the fuel tank through the two-position two-way solenoid valve, the first multi-way valve 1 and the second multi-way valve 2, and the hydraulic system pressure is only the pressure loss along the pipeline, with less power loss.

[0049] 5. A method of adding a temperature detection component 460 to the radiator 461 enables the radiator 461 to be enabled only when the system temperature is relatively high, reducing the system power consumption.

[0050] 6. A method of cooperating the radiator 461 with the check valve 450. When the return oil pressure is relatively high, the check valve 450 opens, allowing the overpressure hydraulic oil to return to the fuel tank through the check valve 450, avoiding damage caused by the large viscosity and large pressure difference of the hydraulic oil in a low-temperature environment exceeding the pressure-bearing range of the radiator 461.

[0051] 7. The first multi-way valve 1, the second multi-way valve 2 and the third multi-way valve 3 are integrated with an electronic control module, which can achieve remote control and logical control according to the data signal feedback from the system, avoiding harm to personnel due to the harsh operating environment.

[0052] 8. The control of the entire hydraulic system is only carried out by using two-position two-way solenoid valves and multi-way valves, without the need to use hydraulic valve blocks for regulating the oil circuit direction, greatly simplifying the control method and the cost of control components. The design scheme of using hydraulic valve blocks to distribute the system hydraulic oil is relatively easy to think of. See Figure 1 , which is a power-consuming design scheme. The difference from the design of this application is that hydraulic valve blocks are used to distribute the hydraulic oil volume. This requires that the first multi-way valve 1, the second multi-way valve 2, and the third multi-way valve 3 used are all closed-center multi-way valves, that is, when the control handle is in the middle position, the hydraulic oil cannot directly return to the fuel tank. Only when the control handle is in the left or right position to control the actuator to act, the hydraulic oil will return to the fuel tank from the T port (oil return port), avoiding the situation that any open-center multi-way valve allows the hydraulic oil to directly run back to the fuel tank when the actuator does not act, resulting in the inability to establish oil pressure to make the load act; however, this design scheme requires an overflow valve to be integrated on the hydraulic valve block to set the system pressure to avoid system overpressure, and the system pressure is always at the set pressure value. The entire system will continuously generate heat under high pressure, wasting system power. In the design scheme used in the prior art, the hydraulic valve block has a large volume, occupies a large positioning space, and has a higher cost.

[0053] 9. A balance valve is used in the rodless cavity of the lifting cylinder 300, which can prevent the cylinder rod from stalling and descending due to the self-weight of the bin body when retracting the cylinder rod.

[0054] 10. A two-way balance valve is used for the unloading and tipping cylinder 200, which can effectively avoid the poor action stability of the unloading and tipping cylinder 200 caused by the continuous change of the load.

[0055] 11. A two-way hydraulic lock is used for the gate cylinder 100. Since the load force received by the gate cylinder 100 is stable, only using the hydraulic lock can ensure that when the gate cylinder 100 does not act, even if there is an external force, the position of the cylinder rod can be kept unchanged.

[0056] It should be noted that:

[0057] 1. The closed-center first multi-way valve 1 of the cross-bridge and the open-center second multi-way valve 2 can be replaced by an open-center multi-way valve, both of which can play the role of allowing the hydraulic oil to directly return to the fuel tank without overflowing and dissipating heat when there is no actuator action in the system;

[0058] 2. The third multi-way valve 3 is not limited to an electro-hydraulic proportional multi-way valve, and can also be a multi-way valve controlled by a digital signal.

[0059] 3. The number of lifting cylinders 300, gate cylinders 100, and discharging and tipping cylinders 200 is not limited. The number of lifting cylinders 300 can be adjusted according to the length dimension of the sand storage bin body. The number of gate cylinders 100 can be adjusted according to the required number of sand storage openings of the sand storage bin. The number of discharging and tipping cylinders 200 is adjusted according to the adjustment requirements of the discharging opening.

[0060] 4. The first control valve can be a two-position two-way solenoid valve or a two-position three-way solenoid valve. Any solenoid valve that can make the hydraulic oil flow in only one direction can replace this two-position two-way solenoid valve.

[0061] 5. The sand conveying mechanism can be driven by a motor or a hydraulic motor. If it is driven by a hydraulic motor, the control of the hydraulic motor can be changed to be controlled by a multi-way valve.

[0062] 6. The cooling fan of the radiator 461 can be driven by a motor or a hydraulic motor. If it is driven by a hydraulic motor, the control of the hydraulic motor can be changed to be controlled by a multi-way valve. And if a multi-way valve with an electronic control module is used, the hydraulic oil cooling fan can be logically controlled to rotate when the sensor senses high temperature and not operate when the temperature is low, so as to reduce the power loss of the system.

[0063] 7. When the demand for sand storage is small, a first-stage cylinder with a displacement sensor can also be used.

[0064] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0065] The present invention provides a sand conveying control system, including a gate cylinder 100, a discharging and tipping cylinder 200, and a lifting cylinder 300. The sand conveying control system further includes: an oil circulation circuit 4, and both ends of the oil circulation circuit 4 are communicated with an oil tank 5; a first multi-way valve 1, a second multi-way valve 2, and a third multi-way valve 3 are all arranged on the oil circulation circuit 4. The first multi-way valve 1 is connected to the gate cylinder 100; the second multi-way valve 2 is connected to the discharging and tipping cylinder 200; the third multi-way valve 3 is connected to the lifting cylinder 300; the first multi-way valve 1 and the third multi-way valve 3 are arranged in parallel, and the first multi-way valve 1 and the second multi-way valve 2 are arranged in series. In this way, when the lifting cylinder 300 finishes working, the gate cylinder 100 and the discharging and tipping cylinder 200 work. When the system is started and no actuating element is operated, the hydraulic oil in the oil tank 5 will directly return to the oil tank through the first multi-way valve 1 and the second multi-way valve 2. The system pressure is only the loss pressure in the oil circulation circuit 4, and the system is unloaded, reducing the power loss in the sand conveying control system.

[0066] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A sand transportation control system, comprising a gate cylinder (100), a discharge tipping cylinder (200) and a lifting cylinder (300), characterized in that, The sand transportation control system further includes: An oil circulation circuit (4), with both ends of the oil circulation circuit (4) communicating with the fuel tank (5) respectively; A first multi-way valve (1), where the first multi-way valve (1) is connected to the gate cylinder (100); A second multi-way valve (2), where the second multi-way valve (2) is connected to the unloading tipping cylinder (200); A third multi-way valve (3), where the third multi-way valve (3) is connected to the lifting cylinder (300); Among them, the first multi-way valve (1), the second multi-way valve (2), and the third multi-way valve (3) are all arranged on the oil circulation circuit (4), the first multi-way valve (1) and the third multi-way valve (3) are arranged in parallel, and the first multi-way valve (1) and the second multi-way valve (2) are arranged in series; The oil circulation circuit (4) includes: an oil outlet main path (40), which communicates with the oil outlet of the fuel tank (5); a first branch path (41), the inlet end of the first branch path (41) communicates with the oil outlet main path (40), the outlet end of the first branch path (41) communicates with the fuel tank (5), and both the first multi-way valve (1) and the second multi-way valve (2) are arranged on the first branch path (41); a second branch path (42), which is arranged in parallel with the first branch path (41), the third multi-way valve (3) is arranged on the second branch path (42), and both ends of the second branch path (42) communicate with the oil outlet main path (40) and the fuel tank (5) respectively; A control handle is arranged on the first multi-way valve (1), and the oil circulation circuit (4) further includes: an oil outlet branch path (43), the first end of the oil outlet branch path (43) communicates with the first multi-way valve (1), the second end of the oil outlet branch path (43) communicates with the fuel tank (5), and by moving the control handle, it controls the oil in the first multi-way valve (1) to flow out from the first branch path (41) or the oil outlet branch path (43).

2. The sand transportation control system according to claim 1, wherein Both the first multi-way valve (1) and the third multi-way valve (3) are closed centers, and the second multi-way valve (2) is an open center.

3. The sand transportation control system according to claim 1, characterized in that, The sand transportation control system further includes: A first control valve (6), arranged on the first branch path (41), and the on-off of the first branch path (41) is controlled by the first control valve (6).

4. The sand transportation control system according to claim 1, characterized in that, The oil circulation circuit (4) further includes: A return oil main path (44), the outlet end of the oil outlet branch path (43) and the outlet end of the third multi-way valve (3) both communicate with the inlet of the return oil main path (44), and the outlet of the return oil main path (44) communicates with the fuel tank (5).

5. The sand transportation control system according to claim 4, wherein The return oil main path (44) further includes: a first return oil branch path (45) and a second return oil branch path (46) arranged in parallel; the sand transportation control system further includes: A check valve (450), arranged on the first return oil branch path (45); A temperature detection component (460), arranged on the second return oil branch path (46); A radiator (461), arranged on the second return oil branch path (46).

6. The sand transportation control system according to claim 4, characterized in that The sand transportation control system further includes: An oil outlet filter (7) and a pump body (8) are arranged in sequence on the main oil outlet path (40) along the flowing direction of the oil fluid; A return oil filter (9) is arranged on the main return oil path (44).

7. The sand transportation control system according to claim 1, wherein The sand transportation control system further includes: A pressure monitoring component (30) is arranged on and connected to the third multi-way valve (3), and the pressure inside the third multi-way valve (3) is monitored through the pressure monitoring component (30).

8. A control method, applicable to the sand transportation control system described in any one of claims 1 to 7, characterized in that, The control method includes: S10: Control the third multi-way valve (3) to open to control the lifting oil cylinder (300) to drive the sand storage bin to extend; S20: Control the second multi-way valve (2) to open to control the discharging and tilting oil cylinder to move the discharging hopper on the sand storage bin to a predetermined discharging position; S30: According to the preset sand output, open the first multi-way valve (1) to control the gate oil cylinder (100) to drive the gate to open to a predetermined sand output position.

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