Impeller rotation control valve group and hydraulic system of sand throwing fire truck

Abstract

The present invention discloses a sand-throwing fire extinguisher impeller rotation control valve group and a hydraulic system. The sand-throwing fire extinguisher impeller rotation control valve group includes a solenoid valve, a relief valve, a first logic valve and an electro-hydraulic reversing valve; the hydraulic system includes a sand-throwing fire extinguisher impeller rotation control valve group, a variable plunger pump, a quantitative gear pump and an externally controlled oil source valve. The present invention can realize the rotation speed change requirements of the impeller, reverse the impeller in the case of material blockage, and help the material to be discharged; the sand-throwing fire extinguisher impeller rotation control valve group can realize more energy saving when the system is unloaded, prevent impact protection system when the system overflows, and prevent system air suction caused by inertial rotation when the system is replenished with oil. The externally controlled external leakage electro-hydraulic reversing valve has a large flow rate, strong interchangeability, and better reversing performance, which provides a strong guarantee for the realization of the functions of the sand-throwing fire extinguisher.

Description

Technical Field

[0001] This patent relates to a sand-throwing fire-extinguishing vehicle impeller rotation control valve group and hydraulic system, belonging to the field of hydraulic application technology. Background Art

[0002] With the rapid development of sand throwing fire extinguishing technology, the mechanization and automation of sand throwing fire extinguishing vehicles are getting higher and higher. The impeller rotating mechanism is the main functional component of the sand throwing fire extinguishing vehicle. It has the functional requirements of throwing, discharging, speed adjustment, etc. It has the performance characteristics of high speed, high torque, and high impact during the working process. Therefore, how to realize the control of the impeller rotating mechanism is very important. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a sand-throwing fire-extinguishing vehicle impeller rotation control valve group, which can realize the rotation speed change requirements of the impeller; on the other hand, the impeller can be reversed in the case of material blockage to help discharge the material; it can also achieve more energy-saving unloading, prevent impact during overflow, and prevent system air suction caused by inertial rotation during oil replenishment.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A sand-throwing fire-extinguishing vehicle impeller rotation control valve group, comprising a solenoid valve, a relief valve, a first logic valve and an electro-hydraulic reversing valve;

[0006] The electro-hydraulic reversing valve is connected to the oil inlet of the first logic valve, and the control end of the spring side of the first logic valve is connected to the overflow valve and the solenoid valve at the same time; the oil output of the electro-hydraulic reversing valve returns to the hydraulic oil tank after passing through the impeller rotating motor;

[0007] When the solenoid valve loses power, the control end on the spring side of the first logic valve is connected to the hydraulic oil tank, and the first logic valve is used for unloading;

[0008] When the solenoid valve is energized, the maximum pressure at the control end on the spring side of the first logic valve is the set pressure of the relief valve, and the first logic valve is used for relief; the electro-hydraulic reversing valve is in the first conduction position or the second conduction position to discharge oil according to the energized state of any electromagnet, so that the oil at the oil inlet is output from the first conduction position or the second conduction position to make the impeller rotation motor rotate forward or reverse.

[0009] Further, when the solenoid valve is energized, the opening pressure of the first logic valve is the maximum pressure of the relief valve plus the spring preset pressure on the spring side of the first logic valve.

[0010] Furthermore, an oil replenishment check valve for replenishing oil from the hydraulic oil tank to the impeller rotating motor is respectively arranged at both ends of the impeller rotating motor.

[0011] Furthermore, it also includes an external control oil source valve for providing external control pressure oil to the impeller rotation control valve group of the sand throwing fire truck.

[0012] Furthermore, the externally controlled oil source valve comprises a filter valve, a relief valve, a second logic valve and a damping orifice;

[0013] The inlet oil is connected to the overflow valve, the second logic valve and the oil source outlet for outputting external control pressure oil through the filter valve. The outlet of the overflow valve is connected to the hydraulic oil tank, and the spring side of the second logic valve is connected to the hydraulic oil tank through the damping hole.

[0014] A hydraulic system includes a sand throwing fire extinguisher impeller rotation control valve group, a variable plunger pump, a quantitative gear pump and an external control oil source valve;

[0015] The variable piston pump sucks the oil in the hydraulic oil tank to the impeller rotation control valve group of the sand throwing fire extinguisher, and the impeller rotation control valve group of the sand throwing fire extinguisher supplies oil to the impeller rotation motor to make the impeller rotation motor rotate forward or reverse;

[0016] The quantitative gear pump sucks the oil from the hydraulic oil tank to the external control oil source valve, and the external control oil source valve provides external control pressure oil to the impeller rotation control valve group of the sand throwing fire truck through the oil source outlet.

[0017] Furthermore, the impeller rotation control valve group of the sand-throwing fire-extinguishing vehicle comprises a solenoid valve, a relief valve, a first logic valve and an electro-hydraulic reversing valve;

[0018] The electro-hydraulic reversing valve is connected to the oil inlet of the first logic valve, and the control end of the spring side of the first logic valve is connected to the overflow valve and the solenoid valve at the same time; the oil output of the electro-hydraulic reversing valve returns to the hydraulic oil tank after passing through the impeller rotating motor;

[0019] When the solenoid valve loses power, the control end on the spring side of the first logic valve is connected to the hydraulic oil tank, and the first logic valve is used for unloading;

[0020] When the solenoid valve is energized, the maximum pressure at the control end on the spring side of the first logic valve is the set pressure of the relief valve, and the first logic valve is used for relief; the electro-hydraulic reversing valve is in the first conduction position or the second conduction position to discharge oil according to the energized state of any electromagnet, so that the oil at the oil inlet is output from the first conduction position or the second conduction position to make the impeller rotation motor rotate forward or reverse.

[0021] Furthermore, the controller controls the impeller rotation control valve group of the sand throwing fire extinguisher to supply oil to the impeller rotation motor according to the scattering system pressure of the sand throwing fire extinguisher collected by the pressure sensor.

[0022] Furthermore, the pressure sensor is installed on the impeller rotation control valve group of the sand-throwing fire-extinguishing vehicle.

[0023] Furthermore, the variable displacement piston pump and the quantitative gear pump are connected to the engine through a power take-off or a transfer case to draw oil from the hydraulic oil tank.

[0024] The beneficial effects achieved by the present invention are:

[0025] 1. It can realize the rotation speed change requirements of the impeller, and reverse the impeller in the case of material blockage to help the material discharge;

[0026] 2. The impeller rotation control valve group includes a solenoid valve, a relief valve, a logic valve, an oil replenishment check valve, and an electro-hydraulic reversing valve, which can achieve more energy saving when the system is unloaded, prevent impact protection when the system overflows, and prevent the system from sucking air due to inertial rotation when the system is replenished. The external control and leakage electro-hydraulic reversing valve has a large flow rate, strong interchangeability, and better reversing performance;

[0027] 3. The external control oil source valve provides reliable control pressure oil for the electro-hydraulic reversing valve;

[0028] 4. The impeller rotation control valve group and hydraulic system provide a strong guarantee for the realization of the sand throwing fire truck function. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 -Hydraulic system schematic diagram;

[0030] Figure 2 - Schematic diagram of the impeller rotation control valve group;

[0031] Figure 3 -Schematic diagram of external oil source valve;

[0032] Figure 4 -3D model diagram of impeller rotation control valve group;

[0033] Hydraulic oil tank 1; variable piston pump 2; pressure sensor 3; impeller rotation control valve group 4; quantitative gear pump 5; impeller rotation motor 6; external control oil source valve 7; solenoid valve 4.1; overflow valve 4.2; logic valve 4.3; oil replenishment check valve 4.4; oil replenishment check valve 4.5; electro-hydraulic reversing valve 4.6; filter valve 7.1; overflow valve 7.2; logic valve 7.3; damping hole 7.4. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0035] like Figure 1 As shown, the technical solution provided by the present invention is a hydraulic system including an impeller rotation control valve group of a sand-throwing fire-extinguishing vehicle, including a hydraulic oil tank 1, a variable piston pump 2, a pressure sensor 3, an impeller rotation control valve group 4, a quantitative gear pump 5, an impeller rotation motor 6 and an externally controlled oil source valve 7.

[0036] The variable piston pump 2 and the quantitative gear pump 5 are connected to the engine through a power take-off or a transfer case, and draw oil from the hydraulic oil tank 1. The variable piston pump 2 has an electric proportional speed regulation function. The oil outlet of the variable piston pump 2 is connected to the impeller rotation control valve group 4. The impeller rotation control valve group 4 is equipped with a pressure sensor 3, which can feed back the pressure of the spreading system to the controller for subsequent control. The impeller rotation control valve group 4 is connected to the impeller rotation motor 6.

[0037] The quantitative gear pump 5 draws oil from the hydraulic oil tank 1, and the oil outlet of the quantitative gear pump 5 is connected to the external control oil source valve 7. The external control oil source valve 7 provides a reasonable and stable external control pressure oil for the impeller rotation control valve group 4 through the LS port. The FP port of the external control oil source valve can provide hydraulic oil for other systems.

[0038] Combination Figure 2 and Figure 4 As shown, the impeller rotation control valve group 4 of the present invention comprises a solenoid valve 4.1, a relief valve 4.2, a logic valve 4.3, an oil replenishing check valve 4.4, an oil replenishing check valve 4.5 and an electro-hydraulic reversing valve 4.6.

[0039] The oil inlet port P of the impeller rotation control valve group 4 is connected to the P port of the electro-hydraulic reversing valve 4.6. The electro-hydraulic reversing valve 4.6 is connected in parallel with the logic valve 4.3. The control end of the spring side of the logic valve 4.3 is connected to the relief valve 4.2, and the relief valve 4.2 is connected in parallel with the solenoid valve 4.1. When the solenoid valve 4.1 is not powered, the control end of the spring side of the logic valve 4.3 is connected to the hydraulic oil tank. At this time, the opening pressure of the logic valve 4.3 is very small, and it acts as a relief valve. When the solenoid valve 4.1 is powered, the maximum pressure of the control end of the spring side of the logic valve 4.3 is the set pressure of the relief valve 4.2. At this time, the opening pressure of the logic valve 4.3 is the maximum pressure of the relief valve 4.2 plus the spring preset pressure of the spring side of the logic valve 4.3, and it acts as a relief valve. The A and B ports of the electro-hydraulic reversing valve 4.6 are connected to the oil replenishing check valves 4.5 and 4.4 respectively, which play the role of reversing and preventing cavitation.

[0040] Combination Figure 3 As shown, the externally controlled oil source valve 7 comprises a filter valve 7.1, a relief valve 7.2, a logic valve 7.3 and a damping orifice 7.4.

[0041] The oil inlet port GP of the external control oil source valve 7 is connected to the filter valve 7.1, the filter valve 7.1 is connected to the overflow valve 7.2 and the logic valve 7.3, the spring side of the logic valve 7.3 is connected to the damping hole 7.4, and the oil source port LS between the filter valve 7.1 and the logic valve 7.3 provides a reasonable and stable external control pressure oil for the impeller rotation control valve group 4.

[0042] During implementation: The engine drives the variable piston pump 2 to suck oil from the hydraulic oil tank 1. The pressure oil supplied by the variable piston pump 2 enters the impeller rotation control valve group 4 through the oil inlet P. The variable piston pump 2 has an electric proportional speed regulation function. When the impeller rotation motor 6 is not working, the electric proportional valve of the variable piston pump 2 shall not be energized. The variable piston pump 2 outputs hydraulic oil at the minimum displacement. The solenoid valve 4.1 in the impeller rotation control valve group 4 shall not be energized. The hydraulic oil is unloaded through the logic valve 4.3, and the system energy consumption is small. When the impeller rotation motor 6 rotates forward, the variable piston pump 2 electric proportional valve is energized, the electromagnet Y1 of the solenoid valve 4.1 in the impeller rotation control valve group 4 is energized, and the electromagnet Y2 of the electro-hydraulic reversing valve 4.6 is energized. The hydraulic oil enters the oil inlet P port of the electro-hydraulic reversing valve 4.6 through the oil inlet P port of the impeller rotation control valve group 4, and passes through the left position of the electro-hydraulic reversing valve 4.6 and the oil outlet A port of the impeller rotation control valve group 4 to make the impeller rotation motor 6 rotate forward, and the return oil flows back to the hydraulic oil tank 1 through the B port and the return oil port T port. The impeller rotation motor 6 is similarly reversed. The electromagnet Y3 of the electro-hydraulic reversing valve 4.6 is energized, and the hydraulic oil enters the oil inlet P of the electro-hydraulic reversing valve 4.6 through the oil inlet P of the impeller rotation control valve group 4, and the impeller rotation motor 6 is reversed through the right position of the electro-hydraulic reversing valve 4.6 and the oil outlet B of the impeller rotation control valve group 4, and the return oil flows back to the hydraulic oil tank 1 through the A port and the return oil port T.

[0043] When the hydraulic system pressure is too high, exceeding the maximum pressure of the relief valve 4.2 plus the spring preset pressure on the spring side of the logic valve 4.3, the hydraulic system overflows at a larger flow rate through the logic valve 4.3 to protect the hydraulic system.

[0044] When the system shuts down normally, the current supplied to the electric proportional valve of the variable piston pump 2 gradually decreases, the displacement of the variable piston pump 2 gradually becomes minimum, the speed of the impeller rotation motor 6 drops to the minimum value, the electromagnet Y1 of the solenoid valve 4.1 in the impeller rotation control valve group 4 and the electromagnet Y2 of the electro-hydraulic reversing valve 4.6 lose power, the rotation inertia of the impeller rotation motor 6 is minimal, and the inertia impact on the hydraulic system is extremely small and can be ignored.

[0045] When the system suddenly loses power or signal due to a fault, the electro-hydraulic reversing valve 4.6 returns to the middle position, and the A and B ports of the impeller rotating motor 6 are connected to the hydraulic oil tank. There will be no impact pressure to cause damage to the pump valve, and the oil replenishment check valve 4.5 can suck oil from the hydraulic oil tank 1 through the return oil port T to prevent the A end of the impeller rotating motor 6 from being sucked empty instantly, thereby protecting the system. The impeller rotating motor 6 is reversed in a similar manner.

[0046] The electro-hydraulic reversing valve 4.6 is an electro-hydraulic reversing valve, which requires the system to provide control oil. This oil can be directly provided by the oil inlet P of the impeller rotation control valve group 4. However, because the pressure of the oil inlet P of the impeller rotation control valve group 4 is low when the impeller rotation motor 6 rotates at no-load and low speed, it is lower than the minimum reversing pressure of the electro-hydraulic reversing valve 4.6, and there are shocks and fluctuations during reversing. The external control oil source valve 7 provides the impeller rotation control valve group 4 with reasonable and stable external control pressure oil through the oil source port LS.

[0047] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A sand throwing fire extinguisher impeller rotation control valve group, characterized in that: It includes a solenoid valve, a relief valve, a first logic valve and an electro-hydraulic reversing valve; The electro-hydraulic reversing valve is connected to the oil inlet of the first logic valve, and the control end of the spring side of the first logic valve is connected to the overflow valve and the solenoid valve at the same time; the oil output of the electro-hydraulic reversing valve returns to the hydraulic oil tank after passing through the impeller rotating motor; When the solenoid valve loses power, the control end on the spring side of the first logic valve is connected to the hydraulic oil tank, and the first logic valve is used for unloading; When the solenoid valve is energized, the maximum pressure at the control end on the spring side of the first logic valve is the set pressure of the overflow valve, and the first logic valve is used for overflow; the electro-hydraulic reversing valve is in the first conduction position or the second conduction position to discharge oil according to the energized state of the first electromagnet or the second electromagnet, so that the oil at the oil inlet is output from the first conduction position or the second conduction position, causing the impeller rotation motor to rotate forward or reverse.

2. According to claim 1, the impeller rotation control valve group of the sand throwing fire extinguisher is characterized in that: When the solenoid valve is energized, the opening pressure of the first logic valve is the maximum pressure of the relief valve plus the spring preset pressure on the spring side of the first logic valve.

3. According to claim 1, the impeller rotation control valve group of the sand throwing fire extinguisher is characterized in that: An oil replenishment check valve for replenishing oil from the hydraulic oil tank to the impeller rotating motor is respectively arranged at both ends of the impeller rotating motor.

4. According to claim 1, the impeller rotation control valve group of the sand throwing fire extinguisher is characterized in that: It also includes an external control oil source valve for providing external control pressure oil to the sand throwing fire truck impeller rotation control valve group.

5. According to claim 4, the impeller rotation control valve group of the sand throwing fire extinguisher is characterized in that: The externally controlled oil source valve comprises a filter valve, a relief valve, a second logic valve and a damping orifice; The inlet oil is connected to the overflow valve, the second logic valve and the oil source outlet for outputting external control pressure oil through the filter valve. The outlet of the overflow valve is connected to the hydraulic oil tank, and the spring side of the second logic valve is connected to the hydraulic oil tank through the damping hole.

6. A hydraulic system, characterized in that: It includes a sand throwing fire extinguisher impeller rotation control valve group, a variable piston pump, a quantitative gear pump and an external control oil source valve; The variable piston pump sucks the oil in the hydraulic oil tank to the impeller rotation control valve group of the sand throwing fire extinguisher, and the impeller rotation control valve group of the sand throwing fire extinguisher supplies oil to the impeller rotation motor to make the impeller rotation motor rotate forward or reverse; The quantitative gear pump draws the oil from the hydraulic oil tank to the external control oil source valve, and the external control oil source valve provides external control pressure oil to the sand throwing fire extinguisher impeller rotation control valve group through the oil source outlet; The sand-throwing fire-extinguishing vehicle impeller rotation control valve group includes a solenoid valve, a relief valve, a first logic valve and an electro-hydraulic reversing valve; The electro-hydraulic reversing valve is connected to the oil inlet of the first logic valve, and the control end of the spring side of the first logic valve is connected to the overflow valve and the solenoid valve at the same time; the oil output of the electro-hydraulic reversing valve returns to the hydraulic oil tank after passing through the impeller rotating motor; When the solenoid valve loses power, the control end on the spring side of the first logic valve is connected to the hydraulic oil tank, and the first logic valve is used for unloading; When the solenoid valve is energized, the maximum pressure at the control end on the spring side of the first logic valve is the set pressure of the overflow valve, and the first logic valve is used for overflow; the electro-hydraulic reversing valve is in the first conduction position or the second conduction position to discharge oil according to the energized state of the first electromagnet or the second electromagnet, so that the oil at the oil inlet is output from the first conduction position or the second conduction position, causing the impeller rotation motor to rotate forward or reverse.

7. The hydraulic system according to claim 6, characterized in that: The controller controls the impeller rotation control valve group of the sand throwing fire extinguisher to supply oil to the impeller rotation motor according to the scattering system pressure of the sand throwing fire extinguisher collected by the pressure sensor.

8. The hydraulic system according to claim 7, characterized in that: The pressure sensor is installed on the impeller rotation control valve group of the sand-throwing fire-extinguishing vehicle.

9. The hydraulic system according to claim 6, characterized in that: The variable piston pump and the quantitative gear pump are connected to the engine through a power take-off or a transfer case and draw oil from the hydraulic oil tank.

Images