Hydraulic control system for a single / double-acting lifting platform

Abstract

The utility model discloses a single double -acting lifting platform hydraulic control system, this control system include oil tank, hydraulic pump, two -way four -way electromagnetic valve, overflow valve, synchronous shunt motor, front lifting three -way five -way electromagnetic valve, front lifting counterbalance valve, front lifting synchronous shunt motor, front lifting explosion -proof valve, front double check type electromagnetic valve, front left hydraulic cylinder, front right hydraulic cylinder, front pull line encoder, rear lifting three -way five -way electromagnetic valve, rear lifting counterbalance valve, rear lifting synchronous shunt motor, rear lifting explosion -proof valve, rear double check type electromagnetic valve, rear left hydraulic cylinder, rear right hydraulic cylinder, rear pull line encoder and hydraulic pipeline, this control system has realized that front lifting platform and rear lifting platform can do synchronous lifting action and can separate independent do asynchronous lifting action, compared with two sets of hydraulic system control two sets of lifting platform, and this hydraulic control system design is more compact, and more energy -conserving environmental protection, and this hydraulic control is also more accurate and reliable on synchronous control precision.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic control system technology for AGV equipment, and in particular to a hydraulic control system for a single- or double-acting lifting platform. Background Technology

[0002] In recent years, with the rapid development of the manufacturing industry, manufacturing production has gradually become automated. To meet the demands of automated and intelligent production, as well as space-efficient production, manufacturing enterprises are placing increasingly higher demands on flexible production and distribution. Traditional production lines for engineering machinery or automobile assembly lines use methods such as plate chain lines, sliding plate lines, or ground chain lines. These traditional methods all require foundation excavation to install the conveyor equipment beneath the ground foundation. This not only results in long construction periods, but more importantly, subsequent changes to the production process necessitate the dismantling of all equipment and backfilling of the foundation. This is detrimental to future changes in factory planning and production schedules, and does not meet the requirements for flexible production.

[0003] Currently, AGVs are widely used as conveying equipment in flexible production lines for construction machinery and automobile assembly lines. In these lines, AGVs typically support the front and rear axles of the vehicle chassis. However, there is a height difference between these support positions. To accommodate different vehicle chassis, with the rear axle support as the baseline, the front axle support needs to automatically adjust its height to ensure the AGV's levelness when supporting the chassis's front axle. Furthermore, when the AGV carries the entire vehicle to the tire assembly station, it must be able to simultaneously lift the vehicle to a predetermined height for easy tire installation on both sides of the chassis. This invention proposes a single / double-acting hydraulic control system for a lifting platform, solving the problem of enabling both synchronous and asynchronous lifting actions for the front and rear lifting platforms. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned situation by providing a single- or double-acting hydraulic control system for a lifting platform. This control system enables the front and rear lifting platforms to perform synchronous lifting actions as well as asynchronous lifting actions independently. Compared to two sets of hydraulic systems controlling two lifting platforms, this hydraulic control system is more compact, more energy-efficient, and more environmentally friendly. At the same time, this hydraulic control is also more accurate and reliable in terms of synchronous control precision.

[0005] The specific solution of this utility model is: a single- or double-acting hydraulic control system for a lifting platform. This control system includes an oil tank, a hydraulic pump, a two-position four-way solenoid valve, a relief valve, a synchronous flow divider motor, a front lifting three-position five-way solenoid valve, a front lifting counterbalancing valve, a front lifting synchronous flow divider motor, a front lifting explosion-proof valve, a front double check valve, a front left hydraulic cylinder, a front right hydraulic cylinder, a front cable encoder, a rear lifting three-position five-way solenoid valve, a rear lifting counterbalancing valve, a rear lifting synchronous flow divider motor, a rear lifting explosion-proof valve, a rear double check valve, a rear left hydraulic cylinder, a rear right hydraulic cylinder, a rear cable encoder, and hydraulic pipelines. The hydraulic pump is connected to the oil tank via hydraulic pipelines and connected to a bypass system composed of the two-position four-way solenoid valve and the relief valve, as well as the synchronous flow divider motor, via a cartridge valve. The synchronous flow divider motor is connected to the hydraulic... The pipelines are connected to the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve respectively; the front lifting three-position five-way solenoid valve is connected to the front lifting counterbalancing valve via a hydraulic pipe, the front lifting counterbalancing valve is connected to the front lifting synchronous flow divider motor via a hydraulic pipe, the front lifting synchronous flow divider motor is connected to the front lifting explosion-proof valve and the front double check valve via a hydraulic pipe, and the front double check valve is directly connected to the front left hydraulic cylinder or the front right hydraulic cylinder; the rear lifting three-position five-way solenoid valve is connected to the rear lifting counterbalancing valve via a hydraulic pipe, the rear lifting counterbalancing valve is connected to the rear lifting synchronous flow divider motor via a hydraulic pipe, the rear lifting synchronous flow divider motor is connected to the rear lifting explosion-proof valve and the rear double check valve via a hydraulic pipe, and the rear double check valve is directly connected to the rear left hydraulic cylinder or the rear right hydraulic cylinder.

[0006] Furthermore, the hydraulic pump described in this utility model is connected to the oil tank, and the hydraulic pump is connected to the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve respectively through hydraulic pipelines; when the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve are energized at the same time, the front and rear lifting platforms perform synchronous lifting or lowering actions; when any one of the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve is energized while the other is de-energized, only one lifting platform performs lifting or lowering actions.

[0007] Furthermore, in this utility model, the two-position four-way solenoid valve and the relief valve are connected to the hydraulic pump via a cartridge valve. The two-position four-way solenoid valve and the relief valve are used together. By controlling the two-position four-way solenoid valve, the system pressure of the hydraulic circuit is regulated. When the pumping pressure of the hydraulic pump exceeds the system set pressure value, the excess hydraulic oil flows back to the oil tank through the relief valve. The default working state of the two-position four-way solenoid valve is normally closed. When the two-position four-way solenoid valve is energized, it can quickly depressurize the hydraulic circuit system.

[0008] Furthermore, the synchronous flow divider motor described in this utility model is connected to the hydraulic pump via a hydraulic pipeline. When the current lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve are simultaneously turned on and off, the synchronous flow divider motor automatically controls the front and rear lifting platforms to perform synchronous lifting and lowering actions. When either the current lifting three-position five-way solenoid valve or the rear lifting three-position five-way solenoid valve is turned on and off, the synchronous flow divider motor automatically controls the corresponding lifting platform to perform lifting and lowering actions.

[0009] Furthermore, in this utility model, the front lifting counterbalance valve is connected to the front lifting three-position five-way solenoid valve and the front synchronous flow divider motor via a hydraulic pipe, and the rear lifting counterbalance valve is connected to the rear lifting three-position five-way solenoid valve and the rear synchronous flow divider motor via a hydraulic pipe.

[0010] Furthermore, in this utility model, the front lifting synchronous flow divider motor is connected to the front lifting explosion-proof valve and the front double check solenoid valve via hydraulic pipes, and the rear lifting synchronous flow divider motor is connected to the rear lifting explosion-proof valve and the rear double check solenoid valve via hydraulic pipes.

[0011] This invention utilizes a single hydraulic control circuit to solve the problem of enabling both synchronous and asynchronous lifting actions for the front and rear lifting platforms. Compared to two hydraulic systems controlling two lifting platforms, this hydraulic control system is more compact, energy-efficient, and environmentally friendly. Furthermore, this hydraulic control is more precise and reliable in terms of synchronous control accuracy.

[0012] The single / double-acting hydraulic control system for a lifting platform described in this utility model has the following advantages: 1. This utility model employs a hydraulic pump connected to an oil tank, which is then connected via hydraulic lines to a front lifting three-position five-way solenoid valve and a rear lifting three-position five-way solenoid valve. When both the front and rear lifting three-position five-way solenoid valves are energized simultaneously, the front and rear lifting platforms perform synchronous lifting or lowering actions; when any one of the front or rear lifting three-position five-way solenoid valves is energized while the other is de-energized, only one lifting platform performs lifting or lowering actions. Utilizing a valve-controlled hydraulic circuit system to control the synchronous or asynchronous lifting of the two lifting platforms greatly simplifies the system's complexity and saves overall space while meeting functional requirements.

[0013] 2. This utility model relates to a two-position four-way solenoid valve and a relief valve connected to a hydraulic pump via a cartridge valve. The two-position four-way solenoid valve and the relief valve work together. By controlling the two-position four-way solenoid valve, the system pressure of the hydraulic circuit can be easily controlled and adjusted. When the pumping pressure of the hydraulic pump exceeds the system's set pressure value, the excess hydraulic oil flows back to the oil tank through the relief valve. Furthermore, the two-position four-way solenoid valve is normally closed by default, ensuring that the hydraulic circuit system remains within the set pressure range, thus playing a pressure-holding role. When the two-position four-way solenoid valve is energized, it allows for rapid pressure relief of the hydraulic circuit system, achieving energy saving and emission reduction.

[0014] 3. The synchronous flow divider motor of this utility model is connected to the hydraulic pump via hydraulic pipeline. When the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve are simultaneously turned on and off, the synchronous flow divider motor automatically controls the front and rear lifting platforms to perform synchronous lifting and lowering actions; when either the front lifting three-position five-way solenoid valve or the rear lifting three-position five-way solenoid valve is turned on and off, the synchronous flow divider motor automatically controls the corresponding lifting platform to perform lifting and lowering actions.

[0015] 4. The front (rear) lifting counterbalancing valve of this utility model is connected to the front (rear) lifting three-position five-way solenoid valve and the front (rear) synchronous flow divider motor via hydraulic pipes. When the lifting platform accidentally falls due to loss of control of the front (rear) synchronous flow divider motor and the front (rear) lifting three-position five-way solenoid valve during operation, the front (rear) lifting counterbalancing valve intervenes to prevent the backflow of oil in the lower chamber of the hydraulic cylinder, thus suspending the load.

[0016] 5. The front (rear) lifting synchronous flow divider motor of this utility model is connected to the front (rear) lifting explosion-proof valve and the front (rear) double check-return solenoid valve via hydraulic pipes. When the hydraulic pipe unexpectedly ruptures, the system pressure will drop rapidly, causing the lifting platform to fall sharply. If the platform is carrying a load, this will result in a collapse. The advantage of directly connecting the front (rear) lifting explosion-proof valve and the front (rear) double check-return solenoid valve to the hydraulic cylinder is that when the aforementioned pipe rupture occurs, due to the sudden system pressure difference, the explosion-proof valve quickly intervenes to close the hydraulic cylinder's oil circuit, preventing the cylinder from suddenly falling. Simultaneously, the addition of the double check-return solenoid valve effectively prevents hydraulic oil backflow, ensuring the normal operation of the pipeline system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the hydraulic principle of this utility model.

[0018] In the diagram: 1-oil tank, 2-hydraulic pump, 3-two-position four-way solenoid valve, 4-relief valve, 5-synchronous flow divider motor, 6-front lifting three-position five-way solenoid valve, 7-front lifting counterbalance valve, 8-front lifting synchronous flow divider motor, 9-front lifting explosion-proof valve, 10-front double check valve, 11-front left hydraulic cylinder, 12-front right hydraulic cylinder, 13-rear lifting three-position five-way solenoid valve, 14-rear lifting counterbalance valve, 15-rear lifting synchronous flow divider motor, 16-rear lifting explosion-proof valve, 17-rear double check valve, 18-rear left hydraulic cylinder, 19-rear right hydraulic cylinder. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model or simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0020] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] See Figure 1This utility model relates to a single- or double-acting hydraulic control system for a lifting platform. The control system includes an oil tank, a hydraulic pump, a two-position four-way solenoid valve, a relief valve, a synchronous flow divider motor, a front lifting three-position five-way solenoid valve, a front lifting counterbalancing valve, a front lifting synchronous flow divider motor, a front lifting explosion-proof valve, a front double check valve, a front left hydraulic cylinder, a front right hydraulic cylinder, a front cable encoder, a rear lifting three-position five-way solenoid valve, a rear lifting counterbalancing valve, a rear lifting synchronous flow divider motor, a rear lifting explosion-proof valve, a rear double check valve, a rear left hydraulic cylinder, a rear right hydraulic cylinder, a rear cable encoder, and hydraulic pipelines. The hydraulic pump is connected to the oil tank via hydraulic pipelines and to a bypass system consisting of a two-position four-way solenoid valve and a relief valve, as well as the synchronous flow divider motor, via a cartridge valve. The synchronous flow divider motor is connected via hydraulic pipelines... Do not connect to the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve; the front lifting three-position five-way solenoid valve is connected to the front lifting counterbalance valve via a hydraulic pipe, the front lifting counterbalance valve is connected to the front lifting synchronous flow divider motor via a hydraulic pipe, the front lifting synchronous flow divider motor is connected to the front lifting explosion-proof valve and the front double check valve via a hydraulic pipe, and the front double check valve is directly connected to the front left hydraulic cylinder or the front right hydraulic cylinder; the rear lifting three-position five-way solenoid valve is connected to the rear lifting counterbalance valve via a hydraulic pipe, the rear lifting counterbalance valve is connected to the rear lifting synchronous flow divider motor via a hydraulic pipe, the rear lifting synchronous flow divider motor is connected to the rear lifting explosion-proof valve and the rear double check valve via a hydraulic pipe, and the rear double check valve is directly connected to the rear left hydraulic cylinder or the rear right hydraulic cylinder. Furthermore, the hydraulic pump described in this invention is connected to the oil tank, and the hydraulic pump is connected to the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve respectively through hydraulic pipelines; when the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve are energized at the same time, the front and rear lifting platforms perform synchronous lifting or lowering actions; when any one of the front lifting three-position five-way solenoid valves and the rear lifting three-position five-way solenoid valve is energized while the other is de-energized, only one lifting platform performs lifting or lowering actions. Furthermore, the two-position four-way solenoid valve and the relief valve described in this invention are connected to the hydraulic pump via cartridge valves. The two-position four-way solenoid valve and the relief valve are used together. By controlling the two-position four-way solenoid valve, the system pressure of the hydraulic circuit is regulated. When the pumping pressure of the hydraulic pump exceeds the system set pressure value, the excess hydraulic oil flows back to the oil tank through the relief valve; the default working state of the two-position four-way solenoid valve is normally closed. When the two-position four-way solenoid valve is energized, it allows the hydraulic circuit system to quickly depressurize. Furthermore, the synchronous flow divider motor described in this utility model is connected to the hydraulic pump via a hydraulic pipeline. When the current lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve are simultaneously turned on and off, the synchronous flow divider motor automatically controls the front and rear lifting platforms to perform synchronous lifting and lowering actions. When either the current lifting three-position five-way solenoid valve or the rear lifting three-position five-way solenoid valve is turned on and off, the synchronous flow divider motor automatically controls the corresponding lifting platform to perform lifting and lowering actions.Furthermore, in this invention, the front lifting counterbalancing valve is connected to the front lifting three-position five-way solenoid valve and the front synchronous flow divider motor via hydraulic pipes, and the rear lifting counterbalancing valve is connected to the rear lifting three-position five-way solenoid valve and the rear synchronous flow divider motor via hydraulic pipes. Furthermore, in this invention, the front lifting synchronous flow divider motor is connected to the front lifting explosion-proof valve and the front double check valve via hydraulic pipes, and the rear lifting synchronous flow divider motor is connected to the rear lifting explosion-proof valve and the rear double check valve via hydraulic pipes.

[0022] The hydraulic control system of this utility model is as follows: Figure 1 As shown, it includes: oil tank 1, hydraulic pump 2, two-position four-way solenoid valve 3, overflow valve 4, synchronous flow divider motor 5, front lifting three-position five-way solenoid valve 6, front lifting counterbalance valve 7, front lifting synchronous flow divider motor 8, front lifting explosion-proof valve 9, front double check valve 10, front left hydraulic cylinder 11, front right hydraulic cylinder 12, rear lifting three-position five-way solenoid valve 13, rear lifting counterbalance valve 14, rear lifting synchronous flow divider motor 15, rear lifting explosion-proof valve 16, rear double check valve 17, rear left hydraulic cylinder 18, and rear right hydraulic cylinder 19. The hydraulic pump 2 is connected to the oil tank 1 via a hydraulic pipe, and to the bypass system (composed of a two-position four-way solenoid valve 3 and an overflow valve 4) and the synchronous flow divider motor 5 via a cartridge valve; the synchronous flow divider motor 5 is connected to the front lifting three-position five-way solenoid valve 6 and the rear lifting three-position five-way solenoid valve 13 via a hydraulic pipe; the front lifting three-position five-way solenoid valve 6 is connected to the front lifting counterbalance valve 7 via a hydraulic pipe; the front lifting counterbalance valve 7 is connected to the front lifting synchronous flow divider motor 8 via a hydraulic pipe; the front lifting synchronous flow divider motor 8 is connected to the front lifting explosion-proof valve 9 and the front dual... A check valve 10 is connected; the front double check valve 10 is directly connected to the front left hydraulic cylinder 12 or the front right hydraulic cylinder 13; the rear lifting three-position five-way solenoid valve 13 is connected to the rear lifting counterbalance valve 14 via a hydraulic pipe; the rear lifting counterbalance valve 14 is connected to the rear lifting synchronous flow divider motor 15 via a hydraulic pipe; the rear lifting synchronous flow divider motor 15 is connected to the rear lifting explosion-proof valve 16 and the rear double check valve 17 via a hydraulic pipe; the rear double check valve 17 is directly connected to the rear left hydraulic cylinder 18 or the rear right hydraulic cylinder 19.

[0023] The above structure solves the problem of whether the front and rear lifting platforms can perform synchronous lifting actions or asynchronous lifting actions independently by using a single hydraulic control circuit. Compared with two hydraulic systems controlling two lifting platforms, this hydraulic control system is more compact, more energy-efficient and environmentally friendly. At the same time, this hydraulic control is more accurate and reliable in terms of synchronous control precision.

[0024] This invention employs a hydraulic pump connected to an oil tank, which is then connected via hydraulic lines to a front lifting three-position five-way solenoid valve and a rear lifting three-position five-way solenoid valve. When both the front and rear lifting three-position five-way solenoid valves are energized simultaneously, the front and rear lifting platforms perform synchronous lifting or lowering actions. When any one of the front or rear lifting three-position five-way solenoid valves is energized while the other is de-energized, only one lifting platform performs lifting or lowering actions. Utilizing a valve-controlled hydraulic circuit system to control the synchronous or asynchronous lifting of two lifting platforms greatly simplifies the system's complexity and saves overall space while meeting functional requirements. This invention also incorporates a two-position four-way solenoid valve and a relief valve connected to the hydraulic pump via a cartridge valve. The two-position four-way solenoid valve and relief valve work together; by controlling the two-position four-way solenoid valve, the system pressure of the hydraulic circuit can be easily controlled and adjusted. When the hydraulic pump's pumping pressure exceeds the system's set pressure value, the excess hydraulic oil flows back to the oil tank through the relief valve. Furthermore, the two-position four-way solenoid valve is normally closed by default, ensuring the hydraulic circuit system maintains pressure within the set pressure range. When energized, it allows for rapid pressure release, contributing to energy conservation and emission reduction. The synchronous flow divider motor is connected to the hydraulic pump via hydraulic lines. When the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve are simultaneously open and closed, the synchronous flow divider motor automatically controls the front and rear lifting platforms to perform synchronous lifting and lowering actions. When either the front or rear lifting three-position five-way solenoid valve is open or closed, the synchronous flow divider motor automatically controls the corresponding lifting platform to perform lifting and lowering actions. The front (rear) lifting counterbalancing valve is connected to the front (rear) lifting three-position five-way solenoid valve and the front (rear) synchronous flow divider motor via hydraulic lines. When the lifting platform unexpectedly falls due to malfunction of the front (rear) synchronous flow divider motor and the front (rear) lifting three-position five-way solenoid valve during operation, the front (rear) lifting counterbalance valve intervenes to prevent backflow of hydraulic oil in the lower chamber of the hydraulic cylinder, thus suspending the load. In this invention, the front (rear) lifting synchronous flow divider motor is connected to the front (rear) lifting explosion-proof valve and the front (rear) double check-return solenoid valve via hydraulic pipes. When a hydraulic line unexpectedly ruptures, the system pressure will drop rapidly, causing the lifting platform to fall sharply. If the platform is carrying a load, this could lead to a collapse. The advantage of directly connecting the front (rear) lifting explosion-proof valve and the front (rear) double check-return solenoid valve to the hydraulic cylinder is that when the aforementioned pipe rupture occurs, the sudden system pressure difference causes the explosion-proof valve to quickly shut off the hydraulic cylinder's oil circuit, preventing the cylinder from suddenly falling. Simultaneously, the addition of the double check-return solenoid valve effectively prevents hydraulic oil backflow, ensuring the normal operation of the pipeline system.

Claims

1. A hydraulic control system for a single- or double-acting lifting platform, characterized in that: The control system includes an oil tank, hydraulic pump, 2-position 4-way solenoid valve, relief valve, synchronous flow divider motor, front lifting 3-position 5-way solenoid valve, front lifting counterbalance valve, front lifting synchronous flow divider motor, front lifting explosion-proof valve, front double check valve, front left hydraulic cylinder, front right hydraulic cylinder, front cable encoder, rear lifting 3-position 5-way solenoid valve, rear lifting counterbalance valve, rear lifting synchronous flow divider motor, rear lifting explosion-proof valve, rear double check valve, rear left hydraulic cylinder, rear right hydraulic cylinder, rear cable encoder, and hydraulic lines. The hydraulic pump is connected to the oil tank via hydraulic lines and to a bypass system consisting of the 2-position 4-way solenoid valve and relief valve, as well as the synchronous flow divider motor, via a cartridge valve. The synchronous flow divider motor is connected to the front lifting 3-position 5-way solenoid valve via hydraulic lines. The valve is connected to the rear lifting three-position five-way solenoid valve; the front lifting three-position five-way solenoid valve is connected to the front lifting counterbalancing valve via a hydraulic pipe, the front lifting counterbalancing valve is connected to the front lifting synchronous flow divider motor via a hydraulic pipe, the front lifting synchronous flow divider motor is connected to the front lifting explosion-proof valve and the front double check valve via a hydraulic pipe, and the front double check valve is directly connected to the front left hydraulic cylinder or the front right hydraulic cylinder; the rear lifting three-position five-way solenoid valve is connected to the rear lifting counterbalancing valve via a hydraulic pipe, the rear lifting counterbalancing valve is connected to the rear lifting synchronous flow divider motor via a hydraulic pipe, the rear lifting synchronous flow divider motor is connected to the rear lifting explosion-proof valve and the rear double check valve via a hydraulic pipe, and the rear double check valve is directly connected to the rear left hydraulic cylinder or the rear right hydraulic cylinder.

2. The hydraulic control system for a single / double-acting lifting platform according to claim 1, characterized in that: The hydraulic pump is connected to the oil tank, and the hydraulic pump is connected to the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve respectively through hydraulic pipelines; when the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve are energized at the same time, the front and rear lifting platforms perform synchronous lifting or lowering actions; when any one of the front lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve is energized and the other is de-energized, only one lifting platform performs lifting or lowering actions.

3. The hydraulic control system for a single or double-acting lifting platform according to claim 1, characterized in that: The two-position four-way solenoid valve and the relief valve are connected to the hydraulic pump via a cartridge valve. The two-position four-way solenoid valve and the relief valve are used together. By controlling the two-position four-way solenoid valve, the system pressure of the hydraulic circuit is regulated. When the pumping pressure of the hydraulic pump exceeds the system set pressure value, the excess hydraulic oil flows back to the oil tank through the relief valve. The default working state of the two-position four-way solenoid valve is normally closed. When the two-position four-way solenoid valve is energized, it can quickly depressurize the hydraulic circuit system.

4. The single / double-acting hydraulic control system for a lifting platform according to claim 1, characterized in that: The synchronous flow divider motor is connected to the hydraulic pump via hydraulic lines. When the current lifting three-position five-way solenoid valve and the rear lifting three-position five-way solenoid valve are simultaneously turned on and off, the synchronous flow divider motor automatically controls the front and rear lifting platforms to perform synchronous lifting and lowering actions. When either the current lifting three-position five-way solenoid valve or the rear lifting three-position five-way solenoid valve is turned on and off, the synchronous flow divider motor automatically controls the corresponding lifting platform to perform lifting and lowering actions.

5. The single / double-acting hydraulic control system for a lifting platform according to claim 1, characterized in that: The front lifting counterbalance valve is connected to the front lifting three-position five-way solenoid valve and the front synchronous flow divider motor via a hydraulic pipe, and the rear lifting counterbalance valve is connected to the rear lifting three-position five-way solenoid valve and the rear synchronous flow divider motor via a hydraulic pipe.

6. The hydraulic control system for a single or double-acting lifting platform according to claim 1, characterized in that: The front lifting synchronous flow divider motor is connected to the front lifting explosion-proof valve and the front double check solenoid valve via hydraulic pipes, and the rear lifting synchronous flow divider motor is connected to the rear lifting explosion-proof valve and the rear double check solenoid valve via hydraulic pipes.

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