Improved energy recovery system of electric stacking machine

Abstract

The utility model discloses an improved electric stacking machine energy recovery system which comprises a motor, an inlet B of the motor is sequentially connected with a first one-way valve and an oil tank, and an outlet A of the motor is sequentially connected with a second one-way valve, a second electromagnetic valve, a load holding valve and a lifting oil cylinder. The motor is driven by the driving motor; the load holding valve is in direct communication with the tank. Gravitational potential energy is effectively recovered and ascending and descending actions are realized through combined use of the one-way valve and the electromagnetic valve, and frequent reversing of the driving motor is not needed; under the working conditions of low load and low speed, oil returns through the electric proportional valve, and the energy consumption of the motor is reduced; the device is mainly suitable for machinery with a lifting function, such as an electric container stacker.

Description

Technical Field

[0001] The utility model relates to the technical field of energy recovery, and more specifically, it relates to an improved energy recovery system for an electric stacker. Background Art

[0002] An electric stacker is a handling device used for container handling. It has a simple structure, flexible operation, good micro-mobility, and high explosion-proof safety performance, and is used for short-distance handling operations such as loading, unloading, stacking, and lifting. Electric stackers are widely applicable, especially for container loading and unloading at small and medium-sized ports, railway transfer stations, and highway transfer stations, and can also be used as auxiliary equipment at large docks.

[0003] Although the existing implementation has a simple structure and low cost, when the motor is used as a pump under the rising condition of the lifting cylinder, the oil suction performance is not good, and it can be supplemented through a parallel circuit. However, the operation of the stacker requires frequent switching between the rising and falling conditions, and the motor needs to frequently reverse, resulting in poor system responsiveness and high noise; under the falling condition, due to the influence of the motor structure, the micro-mobility performance of the system is not ideal. Summary of the Utility Model

[0004] Aiming at the deficiencies existing in the prior art, the purpose of the present utility model is to provide an improved energy recovery system for an electric stacker to solve one or more of the above problems.

[0005] To achieve the above purpose, the present utility model provides the following technical solutions:

[0006] An improved energy recovery system for an electric stacker, comprising

[0007] A motor, its inlet B is sequentially connected to a first one-way valve and a fuel tank, and its outlet A is sequentially connected to a second one-way valve, a second solenoid valve, a load holding valve, and a lifting cylinder;

[0008] The motor is driven by a driving motor;

[0009] The load holding valve is directly connected to the fuel tank.

[0010] Further, the second one-way valve is connected to a safety valve and communicated to the fuel tank.

[0011] Further, the second one-way valve is also connected to a first solenoid valve and communicated to the fuel tank.

[0012] Further, an electro-hydraulic proportional valve is connected in parallel between the first solenoid valve and the second solenoid valve.

[0013] Further, the flow direction of the first one-way valve points to the motor, and the flow direction of the second one-way valve is away from the motor.

[0014] Further, the second solenoid valve is also connected to the inlet B of the motor.

[0015] In summary, the utility model has the following beneficial effects: By combining the use of a check valve and a solenoid valve, the gravitational potential energy can be effectively recovered and the ascending and descending actions can be achieved without the need for the driving motor to frequently reverse; under low load and micro-slow speed conditions, the oil returns through the electro-hydraulic proportional valve and the motor energy consumption is reduced; it is mainly applicable to machinery with lifting functions such as electric container stackers. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the principle structure of an embodiment provided by the utility model.

[0017] In the figure: 1, driving motor; 2, motor; 3, first check valve; 4, second check valve; 5, safety valve; 6, first solenoid valve; 7, second solenoid valve; 8, electro-hydraulic proportional valve; 9, load holding valve; 10, lifting cylinder. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] Embodiment:

[0019] The following further elaborates on the utility model in conjunction with the attached Figure 1 drawings.

[0020] An improved energy recovery system for an electric stacker, as Figure 1 shown, the driving motor 1 drives the motor 2 to operate. The motor 2 is divided into an inlet B and an outlet A. It is led out from the fuel tank and connected to the first check valve 3, and then connected to the inlet B of the motor 2. Among them, the flow direction of the first check valve 3 points to the motor 2, that is, the oil can only flow from the first check valve 3 to the motor 2. The outlet A of the motor 2 is successively connected to the second check valve 4, the second solenoid valve 7, the load holding valve 9 and the lifting cylinder 10. Among them, the second solenoid valve 7 is also directly connected to the inlet B of the motor 2; the flow direction of the second check valve 4 is away from the motor 2, that is, the oil can only flow from the motor 2 to the second check valve 4 and then flow to the subsequent components. The load holding valve 9 is also directly connected to the fuel tank. The second check valve 4 is also externally connected to the safety valve 5 and the first solenoid valve 6 and then led back to the fuel tank. The electro-hydraulic proportional valve 8 is connected in parallel between the first solenoid valve 6 and the second solenoid valve 7.

[0021] The whole includes three oil circuits. The first oil circuit: The oil is led out from the fuel tank, flows through the first check valve 3 and into the inlet B of the motor 2, flows inside the motor 2 and out from the outlet A, and then continues to flow through the second check valve 4 into the second solenoid valve 7 and the load holding valve 9, and finally enters the lifting cylinder 10. The second oil circuit: The oil flows out from the lifting cylinder 10, passes through the load holding valve 9 and the second solenoid valve 7, enters the inlet B of the motor 2, flows out from the outlet A of the motor 2, passes through the second check valve 4, enters the first solenoid valve 6, and then returns to the fuel tank. The third oil circuit: The oil flows out from the lifting cylinder 10 and directly passes through the load holding valve 9 and the electro-hydraulic proportional valve 8 and returns to the fuel tank.

[0022] During the lifting operation, the driving motor 1 rotates to drive the motor 2 to work. The hydraulic fluid in the fuel tank flows through the first one-way valve 3 to the inlet B of the motor 2, and the hydraulic fluid flowing out from the outlet A of the motor 2 enters the lifting cylinder 10 through the second solenoid valve 7 and the load holding valve 9. At this time, the driving motor 1 does positive work and is in the motor working condition.

[0023] During the lowering operation, the electromagnets of the load holding valve 9, the first solenoid valve 6, and the second solenoid valve 7 are energized. The hydraulic fluid in the lifting cylinder 10 flows through the load holding valve 9 and the second solenoid valve 7 to the inlet B of the motor 2, and then enters the first solenoid valve 6 for oil return through the outlet A of the motor 2 and the second one-way valve 4 to complete the lowering action. During the whole process, the hydraulic fluid in the lifting cylinder 10 is high-pressure oil, that is, the pressure at the inlet B of the motor 2 is greater than the pressure at the outlet A. The hydraulic fluid does negative work on the driving motor 1 through the inlet B of the motor 2. The driving motor 1 has a four-quadrant function, and the negative torque generated by the motor 2 makes the driving motor 1 in the generator working condition, realizing the recovery process of converting the gravitational potential energy of the lifting cylinder 10 into electric energy. And during the rising and lowering operations, the driving motor 1 has the same selection direction, without frequent commutation, improving the system response.

[0024] When the lifting cylinder 10 is in the low-load and micro-slow-speed lowering condition, the negative work generated by the motor 2 is not enough to reach the threshold for the driving motor 1 to be in the generating working condition. At this time, the load holding valve 9 and the electro-hydraulic proportional valve 8 are energized, and the hydraulic fluid in the lifting cylinder 10 enters the fuel tank through the load holding valve 9 and the electro-hydraulic proportional valve 8. The lowering speed is changed by changing the current magnitude of the electro-hydraulic proportional valve 8, and at the same time, the driving motor 1 stops working.

[0025] By combining the motor 2 with the driving motor 1 and cooperating with the solenoid valves and one-way valves, the lowering potential energy is converted into electric energy without frequent commutation; the operating performance and energy recovery efficiency of the driving motor 1 in the low-load and micro-slow-speed working conditions are improved.

[0026] It should be noted that this specific embodiment is only an explanation of the present invention, and it is not a limitation of the present invention. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. Improved energy recovery system for electric stacker, characterized in that: including a motor (2), an inlet B of which is sequentially connected to a first one-way valve (3) and a fuel tank, and an outlet A of which is sequentially connected to a second one-way valve (4), a second solenoid valve (7), a load holding valve (9), and a lifting cylinder (10); the motor (2) is driven by a driving motor (1); the load holding valve (9) is directly communicated with the fuel tank; 2. The improved energy recovery system for an electric stacker according to claim 1, wherein: the second one-way valve (4) is connected to a safety valve (5) and communicated with the fuel tank; 3. The improved energy recovery system for an electric stacker according to claim 2, wherein: the second one-way valve (4) is further connected to a first solenoid valve (6) and communicated with the fuel tank; 4. The improved energy recovery system of the electric stacker according to claim 3, characterized in that: an electro-hydraulic proportional valve (8) is connected in parallel between the first solenoid valve (6) and the second solenoid valve (7); 5. The improved energy recovery system for an electric stacker according to claim 1, characterized in that: the flow direction of the first one-way valve (3) points to the motor (2), and the flow direction of the second one-way valve (4) is away from the motor (2); 6. The improved energy recovery system for an electric stacker according to claim 5, characterized in that: the second solenoid valve (7) is further connected to the inlet B of the motor (2).

Images