A constant pressure hydraulic circuit with synchronous cooperation of an oil cylinder and a motor

Abstract

The application provides a constant pressure hydraulic circuit with synchronous cooperation of an oil cylinder and a motor, comprising a power-assisted oil cylinder and an accumulator, and at least one set of hydraulic adjusting circuits is connected to an oil inlet of the circuit through an oil inlet circuit, the oil outlet ends of the hydraulic adjusting circuits are connected to a rodless cavity of the power-assisted oil cylinder and the accumulator respectively, and the oil return ends are connected to an oil return branch connected to an oil return pipeline through an overflow valve. The hydraulic circuit can keep the working pressure of the power-assisted oil cylinder constant during the rising and falling processes, thereby ensuring the stable working state of the motor, achieving convenient adjustment of the working pressure of the power-assisted oil cylinder, and making the hydraulic system convenient to maintain because the accumulator and the power-assisted oil cylinder are connected to the same hydraulic system. In addition, the volume of the accumulator of the application can be designed to be smaller than that of the accumulator in the traditional hydraulic circuit, which is convenient to install and saves cost and space.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic technology, in particular to a constant pressure hydraulic circuit with synchronous cooperation of an oil cylinder and a motor. BACKGROUND

[0002] At present, in the mechanism for reducing the load of the motor to improve heavy objects by providing power assistance for the motor through the power assistance oil cylinder, most of them use an accumulator to provide power for the power assistance oil cylinder alone. However, this scheme often needs a large accumulator, occupies space, and needs to be independent of the accumulator and the power assistance oil cylinder, so that it is not connected with the hydraulic system, thereby causing the problems of difficult maintenance and inconvenient pressure adjustment of the accumulator, and there is a great optimization space. SUMMARY

[0003] In order to solve the problems of large space occupied by the accumulator, inconvenient pressure adjustment, and difficult maintenance of the hydraulic system in the scheme for providing power assistance for the motor through the power assistance oil cylinder in the prior art, the present application provides a hydraulic circuit capable of providing constant pressure for the power assistance oil cylinder, and the specific technical scheme is as follows:

[0004] A constant pressure hydraulic circuit with synchronous cooperation of an oil cylinder and a motor, comprising a power assistance oil cylinder and an accumulator, and at least one set of hydraulic regulating circuit is further connected to the oil inlet of the circuit through an oil inlet circuit, the oil outlet end of the hydraulic regulating circuit is connected with the rodless cavity of the power assistance oil cylinder and the accumulator respectively, and the oil return end is further connected with the oil return branch connected with the oil return pipeline through an overflow valve.

[0005] Preferably, the oil inlet is further connected with a first electromagnetic ball valve, and the oil inlet circuit is connected to the oil inlet at the front end of the oil inlet P of the first electromagnetic ball valve.

[0006] Preferably, the hydraulic regulating circuit comprises an electromagnetic valve, the electromagnetic valve is a three-position four-way electromagnetic valve, the oil inlet P of the electromagnetic valve is connected with the oil inlet circuit, the oil return port T is connected with the oil return branch, and the A port of the electromagnetic valve is connected with the rodless cavity oil port A of the power assistance oil cylinder through a first circulating branch, and the B port of the electromagnetic valve is connected with the rod cavity oil port B of the power assistance oil cylinder through a second circulating branch.

[0007] Preferably, the first circulating branch is connected with the accumulator oil port A.

[0008] Preferably, a hydraulic lock and a second electromagnetic ball valve are further arranged on the first circulating branch, the inlet of the hydraulic lock is connected with the A port of the electromagnetic valve, the outlet of the hydraulic lock is connected with the oil inlet P of the second electromagnetic ball valve, and the oil outlet T of the second electromagnetic ball valve is connected with the rodless cavity oil port A of the power assistance oil cylinder.

[0009] Preferably, the overflow valve is connected between the first circulation branch and the oil return branch through a bypass branch, the first oil port A of the overflow valve is connected to the first circulation branch between the hydraulic lock outlet and the second electromagnetic ball valve inlet, and the second oil port B of the overflow valve is connected to the oil return branch.

[0010] Preferably, the first circulation branch is further connected to the oil return pipeline through a connecting branch, and a ball valve is connected to the connecting branch, the inlet of the ball valve is connected to the first circulation branch, and the outlet of the ball valve is connected to the oil return pipeline.

[0011] Preferably, the oil return pipeline is further connected to a radiator at one end close to the oil tank.

[0012] From the above technical solutions, the present application has the following beneficial effects:

[0013] 1. In the present application, when the power cylinder needs to be lifted, the hydraulic oil in the oil tank enters the rodless cavity of the power cylinder after being adjusted by the hydraulic adjusting circuit, and pushes the power cylinder to lift; when the power cylinder needs to be lowered, the hydraulic oil in the rodless cavity of the power cylinder is discharged and flows back to the oil return branch through the overflow valve, and finally flows back to the oil tank through the oil return pipeline, so that the working pressure of the power cylinder can be kept constant during the lifting and lowering process through the hydraulic circuit, and the working state of the motor is stable, and the working pressure of the power cylinder is conveniently adjusted.

[0014] 2. In the present application, since the accumulator and the power cylinder are connected to the same hydraulic system, the hydraulic system is convenient to maintain, and the pressure of the accumulator can be conveniently adjusted; in addition, the volume of the accumulator of the present application can be smaller than that of the accumulator in the traditional hydraulic circuit, which is convenient to install, saves cost and space.

[0015] 3. In the present application, other adjusting circuits for controlling the execution element can be connected to the oil inlet circuit in the hydraulic circuit, such as adjusting the pressure of the clamping cylinder, so that the compatibility of the hydraulic circuit is higher. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the hydraulic schematic diagram of the present application;

[0017] Figure 2 is a schematic diagram of the first electromagnetic ball valve;

[0018] Figure 3 is a schematic diagram of the electromagnetic valve;

[0019] Figure 4 is a schematic diagram of the second electromagnetic ball valve;

[0020] Figure 5 is a schematic diagram of the overflow valve.

[0021] In the figure: 10, oil tank; 110, oil inlet; 111, gear pump; 112, first electromagnetic ball valve; 113, motor; 120, oil inlet circuit; 130, oil return line; 131, radiator; 140, oil return branch; 150, first circulation branch; 151, hydraulic lock; 152, second electromagnetic ball valve; 160, second circulation branch; 170, bypass branch; 180, connecting branch; 181, ball valve; 20, power cylinder; 210, rodless cavity oil port A; 220, rod cavity oil port B; 30, accumulator; 40, hydraulic regulating circuit; 410, electromagnetic valve; 50, overflow valve. DETAILED DESCRIPTION

[0022] The present application will be described in detail below in conjunction with the drawings and specific embodiments. Before describing the technical solutions of the embodiments of the present application, the terms and names involved will be explained. In the present specification, components with the same name or the same reference signs represent similar or identical structures, and are limited to the purpose of illustration only.

[0023] Reference Figure 1 A constant pressure hydraulic circuit synchronized with a motor and a cylinder includes an oil tank 10, a power cylinder 20, and an accumulator 30. The oil tank 10 is connected to the oil inlet 110 of the constant pressure hydraulic circuit at the oil outlet end, and is connected to the oil return line 130 of the constant pressure hydraulic circuit at the oil return end. Further, the oil inlet 110 is also connected to the oil inlet circuit 120, and the oil inlet circuit 120 is connected to at least one set of hydraulic regulating circuit 40. The hydraulic regulating circuit 40 is used to regulate the pressure when the power cylinder 20 is working. Specifically, the hydraulic regulating circuit 40 of the present application is one set, and the oil outlet end of the hydraulic regulating circuit is connected to the rodless cavity of the power cylinder 20, i.e. connected to the rodless cavity oil port A. In this way, when the power cylinder 20 needs to be lifted, the hydraulic oil in the oil tank 10 enters the rodless cavity of the power cylinder 20 after being regulated by the hydraulic regulating circuit, and pushes the power cylinder 20 to lift. When the power cylinder 20 needs to be lowered, the hydraulic oil in the rodless cavity of the power cylinder 20 is discharged through the power cylinder 20, and flows back to the oil return branch 140 through the overflow valve 50, and finally flows back to the oil tank 10 through the oil return line 130. Thus, through the above regulation process, the working pressure of the power cylinder 20 can be kept constant, thereby ensuring the stable working state of the motor, achieving convenient regulation of the working pressure of the power cylinder, and at the same time, since the accumulator 30 and the power cylinder 20 are connected to the same hydraulic system, the hydraulic system is easy to maintain.

[0024] Reference Figure 2As a preferred technical scheme of the present application, the oil inlet 110 is connected with the gear pump 111 near the oil inlet side of the oil tank 10, the inlet of the gear pump 111 is connected with the oil tank 10, the outlet of the gear pump 111 is connected with the oil inlet 110, the gear pump 111 is further connected with the motor 113, the motor 113 provides power for the gear pump 111, and the hydraulic oil in the oil tank 10 can be input into the constant pressure hydraulic circuit through the oil inlet 110 by the gear pump 111. Meanwhile, the end of the oil inlet 110 away from the oil tank 10 is further connected with the first electromagnetic ball valve 112, which is provided with a Y0 electromagnetic connector, an oil inlet P and an oil outlet T. Specifically, the oil inlet circuit 120 is connected to the oil inlet 110 at the front end of the oil inlet P of the first electromagnetic ball valve 112. In this way, when the first electromagnetic ball valve 112 is not connected, the hydraulic oil output through the oil inlet 110 will flow to the hydraulic regulating circuit through the oil inlet circuit 120.

[0025] With reference to Figure 3 As a preferred technical scheme of the present application, the hydraulic regulating circuit 40 comprises an electromagnetic valve 410. Further, the electromagnetic valve 410 is a three-position four-way electromagnetic valve, which is provided with a Y1 electromagnetic connector and a Y2 electromagnetic connector. The oil inlet P of the electromagnetic valve 410 is connected with the oil inlet circuit 120, the oil return port T is connected with the oil return branch 140 of the oil tank 10, and the A port of the electromagnetic valve 410 is connected with the first circulating branch 150. The end of the first circulating branch 150 away from the electromagnetic valve 410 is connected with the rodless cavity oil port A210 of the power cylinder 20, and the accumulator 30 is also connected to the first circulating branch 150 through the oil port A. The B port of the electromagnetic valve 410 is connected with the second circulating branch 160, and the second circulating branch 160 is connected with the rod cavity oil port B220 of the power cylinder 20. When the power cylinder 20 needs to be lifted, the Y1 electromagnetic connector is de-energized and the Y2 electromagnetic connector is energized, the electromagnetic valve 410 is switched to the left, the oil inlet P of the electromagnetic valve 410 is connected with the A port, and the oil return port T is connected with the B port. The hydraulic oil flows to the first circulating branch 150 through the electromagnetic valve 410, and enters the oil cylinder through the rodless cavity port A210 of the power cylinder 20, so as to realize the lifting of the power cylinder 20. It should be noted that the hydraulic oil flowing into the chamber of the power cylinder 20 will also flow into the accumulator 30 at the same time, so as to realize the buffering and energy storage. At the same time, the hydraulic oil in the rod cavity of the power cylinder 20 can flow back to the oil tank through the second circulating branch 160, the electromagnetic valve 410, the oil return branch 140 and the oil return circuit 130.

[0026] Further with reference to Figure 4, in order to facilitate the circulation of hydraulic oil along the first circulation branch 150, a hydraulic lock 151 and a second electromagnetic ball valve 152 are further connected on the first circulation branch 150, the inlet of the hydraulic lock 151 is connected with the A port of the electromagnetic valve 410, the outlet of the hydraulic lock 151 is connected with the oil inlet port P of the second electromagnetic ball valve 152, the oil outlet port T of the second electromagnetic ball valve 152 is connected with the rodless chamber oil port A of the power cylinder 20, the hydraulic lock 151 has the effect of one-way conduction to the power cylinder 20, in this way, the hydraulic oil can be introduced into the rodless chamber of the power cylinder 20 through the first circulation branch 150 when the power cylinder 20 is lifted, it should be noted that the second electromagnetic ball valve 152 is a two-position two- normally open electromagnetic valve, which is provided with a Y5 electromagnetic connector, when the power cylinder 20 is lifted, the Y5 electromagnetic connector is de-energized at this time, the hydraulic oil flowing through the hydraulic lock 151 can flow to the power cylinder 20 through the second electromagnetic ball valve 152, when the power cylinder 20 needs to be lowered, the Y1 electromagnetic connector and the Y2 electromagnetic connector are both de-energized at this time, the Y5 electromagnetic connector is energized, the second electromagnetic ball valve 152 is still conductive, the hydraulic oil in the rodless chamber of the power cylinder 20 flows back through the first circulation branch 150, and flows through the second electromagnetic ball valve 152, due to the one-way conduction effect of the hydraulic lock 151, the hydraulic oil flows to the oil return branch 140 through the overflow valve 50, and finally flows back to the oil tank 10 through the oil return pipeline 130.

[0027] Specifically, the energization and de-energization of the first electromagnetic ball valve 112, the electromagnetic valve 410 and the second electromagnetic ball valve 152 during the lifting of the power cylinder 20 is shown in the following table 1:

[0028] Table 1 - energization and de-energization of the first electromagnetic ball valve 112, the electromagnetic valve 410 and the second electromagnetic ball valve 152

[0029]

[0030] Note: + means energization of the electromagnet

[0031] Further reference Figure 5 In order to facilitate the connection of the overflow valve 50 to the first circulation branch 150, a bypass branch 170 is provided between the first circulation branch 150 and the oil return branch 140, and the overflow valve 50 is connected to the bypass branch 170, specifically, the first oil port A of the overflow valve 50 is connected to the first circulation branch 150 between the outlet of the hydraulic lock 151 and the inlet of the second electromagnetic ball valve 152, and the second oil port B of the overflow valve 50 is connected to the oil return branch 140, in this way, the hydraulic oil in the rodless chamber of the power cylinder 20 and the hydraulic oil in the accumulator 30 can flow back to the oil return pipeline 130 through the first circulation branch 150, the bypass branch 170 and the oil return branch 140, and finally flow to the oil tank 10, so as to release the pressure in the rodless chamber of the power cylinder 20 and the accumulator 30, and realize the regulation of the pressure during the operation of the power cylinder 20.

[0032] As a preferred technical solution of the present application, the first circulation branch 150 is also connected with the oil return pipeline 130 through a connecting branch 180, and a ball valve 181 is connected on the connecting branch 180. The inlet of the ball valve 181 is connected with the first circulation branch 150, and the outlet of the ball valve 181 is connected with the oil return pipeline 130. The ball valve 181 facilitates the hydraulic oil in the accumulator 30 and the rodless cavity of the power cylinder 20 to return to the oil tank 10, so as to obtain an auxiliary pressure relief effect.

[0033] Further, in order to dissipate the heat of the hydraulic oil returned to the oil tank 10, a radiator 131 is also connected on the oil return pipeline 130 close to the oil tank 10.

[0034] The above-described embodiments are only used to describe the preferred embodiments of the present application, and are not used to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements of the technical solutions of the present application made by those skilled in the art shall fall within the protection scope determined by the claims of the present application.

Claims

1. A constant pressure hydraulic circuit with synchronization of the oil cylinder and the motor, comprising a power-assisted oil cylinder (20) and an accumulator (30), characterized in that, The oil inlet (110) of the circuit is also connected with at least one set of hydraulic regulating circuits (40) through an oil inlet circuit (120), the oil outlet ends of the hydraulic regulating circuits are respectively connected with the rodless chambers of the assist oil cylinders (20) and accumulators (30), and the oil return ends are also connected with an oil return branch (140) connected with an oil return pipeline (130) through a relief valve (50); The hydraulic regulating circuit (40) comprises an electromagnetic valve (410), the electromagnetic valve (410) is a three-position four-way electromagnetic valve, the oil inlet of the electromagnetic valve (410) is connected with the oil inlet circuit (120), the oil return of the electromagnetic valve (410) is connected with the oil return branch (140), the A port of the electromagnetic valve (410) is connected with the rodless chamber oil port A (210) of the assist oil cylinder (20) through a first circulating branch (150), and the B port of the electromagnetic valve (410) is connected with the rod chamber oil port B (220) of the assist oil cylinder (20) through a second circulating branch (160); The first circulating branch (150) is also provided with a hydraulic lock (151) and a second electromagnetic ball valve (152), the inlet of the hydraulic lock (151) is connected with the A port of the electromagnetic valve (410), the outlet of the hydraulic lock (151) is connected with the oil inlet P of the second electromagnetic ball valve (152), and the oil outlet T of the second electromagnetic ball valve (152) is connected with the rodless chamber oil port A (210) of the assist oil cylinder (20); The relief valve (50) is connected between the first circulating branch (150) and the oil return branch (140) through a bypass branch (170), the first oil port A of the relief valve (50) is connected to the first circulating branch (150) between the outlet of the hydraulic lock (151) and the inlet of the second electromagnetic ball valve (152), and the second oil port B of the relief valve (50) is connected to the oil return branch (140).

2. The constant pressure hydraulic circuit for synchronizing the oil cylinder and the motor according to claim 1, wherein The oil inlet (110) is also connected with a first electromagnetic ball valve (112), and the oil inlet circuit (120) is connected to the oil inlet (110) at the front end of the oil inlet P of the first electromagnetic ball valve (112).

3. The constant pressure hydraulic circuit for synchronizing the oil cylinder and the motor according to claim 1, wherein The first circulating branch (150) is connected with the oil port A of the accumulator (30).

4. The constant pressure hydraulic circuit for synchronizing the cylinder and motor according to claim 1, wherein The first circulating branch (150) is also connected with the oil return pipeline (130) through a connecting branch (180), and a ball valve (181) is connected to the connecting branch, the inlet of the ball valve (181) is connected with the first circulating branch (150), and the outlet of the ball valve (181) is connected with the oil return pipeline (130).

5. The constant pressure hydraulic circuit for synchronizing the cylinder and motor according to claim 1, wherein The oil return pipeline (130) is also connected with a radiator (131) at one end close to the oil tank (10).

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