People ascending vehicle

Abstract

The utility model relates to a person ascending vehicle which comprises a portal frame system and a hydraulic control system, the hydraulic system comprises a hydraulic control valve set connected into a hydraulic oil way, and the hydraulic control valve set comprises a proportional direction valve and a flow priority valve; when the proportional direction valve is small in opening degree, the flow priority valve works at the left position, a lifting action oil way of the vehicle is conducted, and an auxiliary action oil way is cut off; when the proportional direction valve is in a large opening degree, the flow priority valve works at the right position, an auxiliary action oil way of the vehicle is conducted, and a lifting action oil way is cut off; and a plurality of hydraulic control valves in the hydraulic control valve group are arranged on a valve group mounting seat in a centralized manner. The scheme has the advantages of reducing energy consumption, reducing system heating and improving system stability.

Description

A type of person going up vehicle Technical Field

[0001] This utility model relates to the field of vehicles for people to ascend, and in particular to a vehicle for people to ascend. Background Technology

[0002] With the continuous development of logistics technology and the increasing cost of labor, warehouse racks are becoming increasingly taller, leading to the widespread application of manned upward-moving vehicles for picking, including manned three-way stacker trucks and manned picking trucks. The main characteristics of these manned upward-moving vehicles are hydraulic transmission, high mast, and heavy unloaded capacity.

[0003] Because the existing hydraulic transmission system of the three-way stacker truck has low precision and high energy consumption, it is necessary to reselect the main hydraulic components and optimize the hydraulic system principle and control strategy to improve energy utilization. Summary of the Invention

[0004] In order to solve the above problems, the purpose of this utility model is to provide a vehicle for people to go up, which can reduce energy loss and achieve the goals of energy saving, high efficiency and precise control.

[0005] A vehicle for transporting people to and from a vehicle includes: a gantry system and a hydraulic control system, said hydraulic system comprising:

[0006] motor,

[0007] A two-way gear pump, driven by the motor, delivers hydraulic oil to the hydraulic circuit in either the forward or reverse direction.

[0008] A hydraulic control valve assembly connected to the hydraulic circuit includes a proportional directional valve and a flow priority valve. The proportional directional valve switches between a small opening and a large opening, while the flow priority valve switches between operating in the left and right positions. When the proportional directional valve is at its small opening, the flow priority valve operates in the left position, opening the hydraulic circuit for the vehicle's lifting action and cutting off the hydraulic circuit for the auxiliary action. When the proportional directional valve is at its large opening, the flow priority valve operates in the right position, opening the hydraulic circuit for the vehicle's auxiliary action and cutting off the hydraulic circuit for the lifting action. Multiple hydraulic control valves in the hydraulic control valve assembly are centrally mounted on a valve assembly mounting base.

[0009] Preferably, an unloading solenoid valve is provided on the unloading oil circuit before the flow priority valve enters the vehicle lifting action oil circuit. When the flow priority valve is in the right position, the passage of the unloading solenoid valve to the return oil tank is opened, and the excess hydraulic oil that has passed through the flow priority valve to the lifting oil circuit is directly returned to the oil circuit through the unloading solenoid valve.

[0010] Preferably, the oil line between the outlet of the proportional directional valve and the inlet of the flow priority valve in its right-hand operation is provided with a pressure relief oil line directly connected to the output of the unloading solenoid valve, and the pressure relief oil line is provided with a damping orifice.

[0011] Preferably, the system includes a control knob that controls the current of the proportional directional valve to achieve a linear change in the valve opening; the control knob also controls the output power and speed of the motor in a coordinated manner.

[0012] Preferably, based on the matching performance between the required flow rate of the lifting cylinder and the main gantry cylinder and the output flow rate of the bidirectional gear pump, the relationship between the current of the proportional directional valve and the output power of the motor is preset, and the control knob performs linkage control of the proportional directional valve and the motor according to the preset relationship.

[0013] Preferably, the return oil circuit of the vehicle's lifting action is equipped with a proportional flow valve, a lowering solenoid valve, and a return back pressure valve, which are used when the vehicle is lowering.

[0014] During the lowering action, the proportional flow valve and the lowering solenoid valve open, and the hydraulic oil returning from the vehicle's lifting action oil circuit enters the bidirectional gear pump through the proportional flow valve, the lowering solenoid valve, and the return back pressure valve.

[0015] Preferably, an emergency return oil circuit is also included, wherein an emergency lowering valve is provided on the emergency return oil circuit, and the hydraulic oil returning from the vehicle's lifting action oil circuit directly enters the bidirectional gear pump through the emergency lowering valve.

[0016] This application has the following advantages due to the adoption of the above-mentioned scheme:

[0017] 1. By linearly changing the opening of the proportional directional valve, the flow priority valve can dynamically distribute the flow, reducing energy consumption; at the same time, it can prevent the hydraulic pump output flow from exceeding the actual demand, reduce system heat generation, and extend the life of hydraulic components.

[0018] 2. It can avoid unstable cylinder operation caused by insufficient flow (such as shaking of the lifting cylinder or sluggishness of the auxiliary cylinder), and improve the overall stability of the hydraulic system.

[0019] 3. Flow priority can also simplify operation and improve operability. Operators do not need to manually adjust the flow distribution. The system automatically optimizes the flow distribution, reduces the difficulty of operation, and improves the operability and operation efficiency of the forklift. Attached Figure Description

[0020] Figure 1 is a schematic diagram of the hydraulic system oil circuit structure of this application;

[0021] Figure 2 is a structural schematic diagram of the vehicle for the person going up in this application;

[0022] Figure 3 is a schematic diagram of the structural arrangement of the hydraulic system of this application on a vehicle for people to ascend;

[0023] Figure 4 is a schematic diagram of the hydraulic control valve assembly.

[0024] Figure label:

[0025] 1. Two-way gear pump; 2. Proportional directional valve; 3. Flow priority valve; 41. First check valve; 42. Second check valve; 5. Lifting cylinder; 6. Main gantry cylinder; 7. Unloading solenoid valve; 8. Damping orifice; 9. Relief valve; 10. Proportional flow valve; 11. Emergency lowering valve; 12. Lowering solenoid valve; 13. Return oil back pressure valve; 14. Return oil filter; 17. Pump motor; 18. Hydraulic control valve assembly. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below.

[0027] This embodiment provides a vehicle for people to ascend, as shown in Figure 2, which mainly includes a gantry system and a hydraulic control system.

[0028] The gantry system includes a main gantry, a lifting platform slidably mounted on the main gantry, a main gantry cylinder 6 for lifting the gantry, and a lifting cylinder 5 for driving the lifting platform to lift. The lifting platform can be an operating platform or forks. In addition to lifting, the lifting platform can also perform auxiliary actions such as horizontal movement and tilt adjustment via a hydraulic system in conjunction with auxiliary cylinders.

[0029] The hydraulic control system includes a lifting action oil circuit and an auxiliary action oil circuit connected to the gantry system. The lifting action oil circuit is connected to the main gantry cylinder 6 and the lifting cylinder, and the lifting action of the gantry elevator platform is controlled by controlling the flow of hydraulic oil in and out of the main gantry cylinder 6 and the lifting cylinder. The auxiliary action oil circuit is connected to the auxiliary action oil circuit, and the auxiliary action control of the vehicle is achieved by controlling the flow of hydraulic oil in and out of the auxiliary action cylinder.

[0030] As shown in Figures 1 and 3, the power structure of the hydraulic control system mainly includes a motor and a bidirectional gear pump 1. In this embodiment, the motor refers to the pump motor 17, which drives the bidirectional gear pump 1 to deliver hydraulic oil in the hydraulic control system. The hydraulic control system also includes a hydraulic control valve group.

[0031] 18. As shown in Figure 4, in this embodiment, multiple hydraulic control valves in the hydraulic control valve group 18 are centrally mounted on a valve group mounting base. This arrangement facilitates the connection between the hydraulic pipelines and the hydraulic valve group in the hydraulic control system, allows the connection relationship of each hydraulic control valve to be arranged in advance on the valve group mounting base, improves assembly efficiency, and enhances the structural compactness of the vehicle.

[0032] In the hydraulic circuit, the hydraulic control valve group 18 includes a proportional directional valve 2 and a flow priority valve 3. The proportional directional valve 2 switches between a small opening and a large opening, while the flow priority valve 3 switches between operating in the left and right positions. When the proportional directional valve 2 is at a small opening, the flow priority valve 3 operates in the left position, opening the hydraulic circuit for the vehicle's lifting action and cutting off the hydraulic circuit for the auxiliary action. When the proportional directional valve 2 is at a large opening, the flow priority valve 3 operates in the right position, opening the hydraulic circuit for the vehicle's auxiliary action and cutting off the hydraulic circuit for the lifting action. As shown in Figure 1, in this embodiment, ports 5 and 6 of the flow priority valve 3 are hydraulic oil input terminals, and ports 7 and 8 are hydraulic oil output terminals. In one operating state, the bidirectional gear pump 1 is running, the proportional directional valve 2QN1 is slightly open, and the bidirectional gear pump 1 outputs hydraulic oil. Most of the oil cannot pass through the proportional directional valve 2, and the oil flows from position 1 to the flow priority valve 3. This generates a hydraulic control force pushing the flow priority valve 3 to the right from position 6, causing the flow priority valve 3 to operate in the left position. Hydraulic oil is output from port 8 of the flow priority valve 3 to the lifting action oil circuit, enabling the vehicle to lift. In another operating state, the bidirectional gear pump 1 is running, the proportional directional valve 2QN1 is fully open, and the bidirectional gear pump 1 outputs hydraulic oil. Most of the oil passes through the proportional directional valve 2 to the flow priority valve 3. This generates a hydraulic control force pushing the flow priority valve 3 to the left from position 5, causing the flow priority valve 3 to operate in the right position. Hydraulic oil is output from port 7 of the flow priority valve 3 to the auxiliary action oil circuit, enabling the vehicle to perform auxiliary actions.

[0033] By coordinating the proportional directional valve 2 and the flow priority valve 3, the hydraulic oil is controlled to enter the lifting action oil circuit or the auxiliary action oil circuit. Through the linear change of the opening of the proportional directional valve 2, the flow priority valve 3 can dynamically distribute the flow, reducing energy consumption. At the same time, it avoids the hydraulic pump output flow from exceeding the actual demand, reduces system heat generation, and extends the life of hydraulic components. Furthermore, it can avoid cylinder instability caused by insufficient flow (such as lifting cylinder vibration or auxiliary cylinder sluggishness), thus improving the overall stability of the hydraulic system.

[0034] In this embodiment, an unloading solenoid valve 7 is provided on the unloading oil line before the flow priority valve 3 enters the vehicle lifting action oil line. When the flow priority valve 3 is in the right position, the passage of the unloading solenoid valve 7 connected to the return oil tank is opened, and the excess hydraulic oil that has passed through the flow priority valve 3 to the lifting oil line is directly returned through the unloading solenoid valve 7. With this configuration, during auxiliary actions, the hydraulic oil that has passed through the flow priority valve 3 to the lifting action oil line can be completely unloaded. Without this unloading valve, the excess flow of the flow priority valve 3 can only overflow from the relief valve 9, thus generating a large amount of heat and causing energy loss. Furthermore, on the oil line between the outlet end of the proportional directional valve 2 and the inlet of the flow priority valve 3 in the right position, there is a pressure relief oil line directly connected to the output end of the unloading solenoid valve 7. The pressure relief oil line is provided with a damping orifice 8. The setting of this damping orifice 8 for pressure relief can ensure that the hydraulic control force on the right side of the flow priority valve 3 is unloaded, and the valve core can easily move to the right, realizing smooth switching of the lifting action and effectively improving the overall stability of the hydraulic system. Preferably, the output end of the unloading oil circuit is equipped with a return oil filter 14, so that the oil returned from the unloading oil circuit is filtered and returned to the oil tank, which can prevent impurities from entering and improve the cleanliness NAS level of the entire system.

[0035] As shown in Figure 1, a first check valve 41 is provided between the flow priority valve 3 and the lifting action oil circuit, and a second check valve 42 is provided between the flow priority valve 3 and the auxiliary action oil circuit. By setting the first check valve 41 and the second check valve 42, sufficient hydraulic oil is ensured to enter the corresponding action oil circuit, enabling precise control. The direction from the first end to the second end of the first check valve 41 is the conduction direction. The input end of the unloading oil circuit is connected to the first end of the first check valve 41, and the output end of the unloading oil circuit is connected to the return oil tank; the return oil circuit of the vehicle's lifting action oil circuit...

[0036] The input end is connected to the second end of the first one-way valve 41, and the output end of the return oil circuit of the lifting action oil circuit is connected to the bidirectional gear pump 1. With the above configuration, the hydraulic oil can be returned from the unloading oil circuit or the return oil circuit under different working conditions of the vehicle by adjusting the conduction direction of the first one-way valve. The structure is simple.

[0037] The lifting hydraulic circuit of the vehicle is equipped with a proportional flow valve 10, a descent solenoid valve 12, and a return back pressure valve 13. During the descent of the vehicle, the proportional flow valve 10 and the descent solenoid valve 12 open, and the hydraulic oil returning from the lifting hydraulic circuit passes through the proportional flow valve 10, the descent solenoid valve 12, and the return back pressure valve 13 into the bidirectional gear pump 1. In actual working conditions, the high gantry frequently descends under no-load conditions. During descent, the large chambers of the fully free lifting cylinder 5 and the main gantry cylinder 6 are connected in series. The proportional flow valve 10QN2 is energized, and its internal proportional solenoid valve and pressure compensation valve can control different descent speeds. Through the pressure compensation function, it can ensure stable speed during descent under different load conditions, preventing accidents caused by stalling during heavy-load descent of the high gantry. The descent solenoid valve 12QM2 is energized, realizing dual protection during descent and preventing safety problems caused by the failure of the proportional flow valve 10.

[0038] As described above, during the descent of the high gantry, the hydraulic fluid in the large chambers of the main gantry cylinder 6 and the lifting cylinder 5 passes through the proportional flow valve 10, the descent solenoid valve 12, and the return back pressure valve 13, entering the bidirectional gear pump 1. This drives the bidirectional gear pump 1 to rotate in the reverse direction, driving the motor to convert pressure energy into electrical energy, thereby realizing the energy recovery function of the high gantry's load-bearing descent. Preferably, an emergency return oil circuit is also included, which is equipped with an emergency descent valve 11. When the emergency descent valve 11 is opened, the hydraulic oil returning from the vehicle's lifting operation oil circuit directly enters the bidirectional gear pump 1 through the emergency descent valve 11. The emergency descent valve 11 provides a safety mechanism for the vehicle, ensuring that the lifting platform can safely descend from its high position in the event of a system failure.

[0039] On the other hand, the vehicle also includes a control knob, which controls the current of the proportional directional valve 2 to achieve a linear change in the valve opening; the control knob also controls the output power and speed of the motor. In this embodiment, the specific linkage between the two is as follows: based on the matching performance between the required flow of the lifting cylinder 5 and the main mast cylinder 6 and the output flow of the bidirectional gear pump 1, a relationship between the current of the proportional directional valve 2 and the output power of the motor is preset, and the control knob controls the proportional directional valve 2 and the motor in a linked manner according to this preset relationship. Thus, by combining motor speed regulation and proportional flow control, precise control of the actuator is achieved. Especially in heavy-load micro-motion operation conditions, setting the control knob to a small opening allows the handle to control the small displacement of the cylinder at a large angle, greatly improving operability.

[0040] Specifically, during the lifting action, the pump motor 17 outputs a constant flow rate, which is adjusted by a knob in the cab to control the current of the proportional directional valve 2QN1, achieving a linear change in the valve opening. The oil flows through the bypass of the proportional directional valve 2 and then through the left-hand function of the flow priority valve 3. At the same time, the knob controls the motor speed in conjunction with the flow rate, which can effectively improve the matching performance between the required flow rate of the fully free lifting cylinder 5 and the main mast cylinder 6 and the output flow rate of the bidirectional gear pump 1, reducing the heat generated by flow redundancy.

[0041] During auxiliary operation, the pump motor 17 outputs a constant flow rate, which is adjusted by the knob in the cab to control the current of the proportional directional valve 2QN1, thereby achieving a linear change in the valve opening. The oil flows through the proportional directional valve 2 and the right-hand function of the flow priority valve 3. At the same time, the knob controls the motor speed in conjunction with the operation, which can effectively improve the matching performance between the required flow rate of the auxiliary fork swing cylinder and the side shift cylinder and the output flow rate of the bidirectional gear pump 1, and reduce the heat generated by flow redundancy.

[0042] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A vehicle for people to travel upwards, characterized in that, include: The gantry system and hydraulic control system, wherein the hydraulic control system includes: a motor and a bidirectional gear pump, which are driven by the motor to deliver hydraulic oil to the hydraulic circuit in either the forward or reverse direction; A hydraulic control valve assembly connected to the hydraulic circuit includes a proportional directional valve and a flow priority valve. The proportional directional valve switches between a small opening and a large opening, while the flow priority valve switches between operating in the left and right positions. When the proportional directional valve is at its small opening, the flow priority valve operates in the left position, opening the hydraulic circuit for the vehicle's lifting action and cutting off the hydraulic circuit for the auxiliary action. When the proportional directional valve is at its large opening, the flow priority valve operates in the right position, opening the hydraulic circuit for the vehicle's auxiliary action and cutting off the hydraulic circuit for the lifting action. Multiple hydraulic control valves in the hydraulic control valve assembly are centrally mounted on a valve assembly mounting base.

2. The vehicle for people to ascend according to claim 1, characterized in that, An unloading solenoid valve is installed on the unloading oil circuit before the flow priority valve enters the vehicle lifting action oil circuit. When the flow priority valve is in the right position, the passage of the unloading solenoid valve to the return oil tank is opened, and the excess hydraulic oil that has passed through the flow priority valve to the lifting oil circuit is directly returned through the unloading solenoid valve.

3. The vehicle for people to ascend according to claim 1, characterized in that, The oil line between the outlet of the proportional directional valve and the inlet of the flow priority valve in its right position is provided with a pressure relief oil line that is directly connected to the output of the unloading solenoid valve, and the pressure relief oil line is provided with a damping orifice.

4. The vehicle for people to ascend according to claim 1, characterized in that, The system includes a control knob that controls the current of the proportional directional valve to achieve a linear change in the valve opening; the control knob also controls the output power and speed of the motor in a coordinated manner.

5. A vehicle for people to ascend according to claim 4, characterized in that, Based on the matching performance between the required flow rate of the lifting cylinder and the main gantry cylinder and the output flow rate of the bidirectional gear pump, the relationship between the current of the preset proportional directional valve and the output power of the motor is established. The control knob then performs linkage control of the proportional directional valve and the motor according to the relationship between the current of the preset proportional directional valve and the output power of the motor.

6. The vehicle for people to ascend according to claim 1, characterized in that, The return oil circuit of the vehicle's lifting action is equipped with a proportional flow valve, a descent solenoid valve, and a return oil back pressure valve. When the vehicle is lowering, the proportional flow valve and the descent solenoid valve open, and the hydraulic oil returning from the vehicle's lifting action oil circuit enters the bidirectional gear pump through the proportional flow valve, the descent solenoid valve, and the return oil back pressure valve.

7. A vehicle for people to ascend according to claim 6, characterized in that, It also includes an emergency return oil circuit, which is equipped with an emergency descent valve. Hydraulic oil returning from the vehicle's lifting action oil circuit directly enters the bidirectional gear pump through the emergency descent valve.

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