Single-action motor hydraulic system

Abstract

The utility model discloses a single-action motor hydraulic system, which relates to the technical field of hydraulic control systems and comprises an oil inlet pipeline, a two-way cartridge valve, an oil outlet pipeline, a two-position three-way hydraulic control reversing valve, a control oil pipeline, a first working oil pipeline, a second working oil pipeline, a third working oil pipeline, an overflow pipeline and an overflow valve. An oil inlet of the oil inlet pipeline is used for being connected with a main control valve oil port, an oil outlet of the oil outlet pipeline is used for being connected with a single-action motor working oil port, and an oil return port of the second working oil pipeline is used for being connected with an oil tank oil port. The hydraulic control system meets the requirements for high pressure and large flow of the hydraulic control system, and meanwhile can be prevented from being impacted by reverse flow of high-pressure oil caused by reverse rotation of the single-action motor.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic control systems, in particular to a single-acting motor hydraulic system. Background Art

[0002] Hydraulic control systems are widely used in the production of the machinery manufacturing industry. As an actuator, the hydraulic motor is one of the key components, and the conversion of the hydraulic control system is usually achieved through the hydraulic motor.

[0003] The single-acting motor in the hydraulic motor is commonly used to drive industrial mechanical equipment such as conveyor belts, hydraulic fixtures, agricultural machinery, and tractors, as well as occasions that require unidirectional action in heavy mechanical equipment such as ships, excavators, and cranes. The single-acting motor has the advantages of simple structure, small volume, and high cost performance.

[0004] However, during the use of the above equipment, there is a situation where the hydraulic pipeline bursts due to high pressure caused by abnormal factors, resulting in the sudden reverse rotation of the single-acting motor. The reverse rotation of the single-acting motor will damage the equipment and workpieces, and even endanger personal safety. Therefore, how to effectively improve the hydraulic safety control system is an urgent problem to be solved at present. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a single-acting motor hydraulic system to solve the problems existing in the above-mentioned prior art. While meeting the requirements of high pressure and large flow of the hydraulic control system, it can prevent the reverse rotation of the single-acting motor from causing the reverse flow of high-pressure oil to impact the hydraulic control system.

[0006] To achieve the above purpose, the utility model provides the following scheme:

[0007] The utility model provides a single-acting motor hydraulic system, including an oil inlet pipeline, a two-way cartridge valve, an oil outlet pipeline, and a two-position three-way hydraulic control reversing valve. The oil inlet of the oil inlet pipeline is used to connect with the oil port of the main control valve. The oil outlet of the oil inlet pipeline is connected with the oil inlet of the two-way cartridge valve. The oil outlet of the two-way cartridge valve is connected with the oil inlet of the oil outlet pipeline. The oil outlet of the oil outlet pipeline is used to connect with the working oil port of the single-acting motor;

[0008] The control oil port of the two-position three-way hydraulic control reversing valve is connected with the oil inlet pipeline through a control oil pipeline; the first working oil port of the two-position three-way hydraulic control reversing valve is connected with the control oil port of the two-way cartridge valve through a first working oil pipeline; a second working oil pipeline is connected to the second working oil port of the two-position three-way hydraulic control reversing valve. One end of the second working oil pipeline far from the two-position three-way hydraulic control reversing valve is an oil return port, and the oil return port is used to connect with the oil port of the fuel tank; the third working oil port of the two-position three-way hydraulic control reversing valve is connected with the oil outlet pipeline through a third working oil pipeline;

[0009] An overflow pipeline is also connected to the oil outlet pipeline. One end of the overflow pipeline away from the oil outlet pipeline is connected to the oil inlet pipeline, and an overflow valve is provided on the overflow pipeline.

[0010] Preferably, the overflow valve is a direct-acting overflow valve.

[0011] Preferably, a filter is provided on the third working oil pipeline.

[0012] Preferably, the filter is an inserted filter.

[0013] Preferably, a pressure sensor is further provided at a position on the overflow pipeline between the oil outlet pipeline and the overflow valve.

[0014] Preferably, the oil outlet of the oil outlet pipeline can be connected to the working oil port of the single-acting motor through a threaded fastener and sealed with a sealing ring.

[0015] Preferably, the threaded fastener is a screw.

[0016] Preferably, the sealing ring is an O-ring.

[0017] The utility model has achieved the following technical effects compared with the prior art:

[0018] The single-acting motor hydraulic system provided by the utility model includes an oil inlet pipeline, a two-way cartridge valve, an oil outlet pipeline, a two-position three-way hydraulic control reversing valve, a control oil pipeline, a first working oil pipeline, a second working oil pipeline, a third working oil pipeline, an overflow pipeline and an overflow valve. The oil inlet of the oil inlet pipeline is used to be connected to the main control valve oil port, the oil outlet of the oil outlet pipeline is used to be connected to the working oil port of the single-acting motor, and the oil return port of the second working oil pipeline is used to be connected to the oil tank oil port; this system can realize two hydraulic control oil circuits, one is the normal working oil circuit of the single-acting motor, and the other is the oil pipeline burst oil circuit from the control valve to the explosion-proof valve.

[0019] When the single-acting motor is in a normal working state, a part of the oil from the main control valve enters the two-way cartridge valve through the oil inlet pipeline, and another part enters the control oil port of the two-position three-way hydraulic control reversing valve through the control oil pipeline. As the oil pressure rises, the two-position three-way hydraulic control reversing valve changes its direction: the first working oil port and the second working oil port are opened, and the third working oil port is closed. At this time, the pressure oil in the spring chamber of the two-way cartridge valve flows back to the oil tank through the first working oil pipeline, the two-position three-way hydraulic control reversing valve and the second working oil pipeline in sequence, and the spool of the two-way cartridge valve opens, realizing the connection between the oil inlet pipeline and the oil outlet pipeline, enabling the oil from the main control valve to enter the single-acting motor, and the single-acting motor operates normally.

[0020] When the load controlled by the single-acting motor is overweight or other abnormal factors occur, as the oil pressure rises, the high-pressure pipeline of the main control valve bursts, and the pressure at the oil inlet of the oil inlet pipeline drops rapidly. The single-acting motor reverses, and the oil flows reversely. At this time, there is no pressure at the control oil port of the two-way three-way hydraulic control reversing valve, and the two-way three-way hydraulic control reversing valve resets: the first working oil port and the third working oil port open, and the second working oil port closes. A part of the high-pressure oil flowing reversely flows into the spring chamber of the two-way cartridge valve through the oil outlet pipeline, the third working oil pipeline, the two-way three-way hydraulic control reversing valve, and the first working oil pipeline in sequence, so as to quickly close the two-way cartridge valve, prevent the single-acting motor from reversing, and avoid the malfunction of the actuator. Another part of the high-pressure oil overflows through the overflow valve on the overflow pipeline to achieve buffering and shock prevention effects.

[0021] This system adopts an integrated two-way cartridge valve explosion-proof valve group design, which is directly installed on the single-acting motor to achieve safety protection for the single-acting motor. Moreover, by utilizing the large flow rate characteristics of the two-way cartridge valve, the normal functions of the hydraulic system are satisfied. Brief Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of the single-acting motor hydraulic system provided by the embodiment of the present invention.

[0024] In the figure: 1 - oil inlet pipeline, 101 - oil inlet of the oil inlet pipeline, 2 - two-way cartridge valve, 201 - oil inlet of the two-way cartridge valve, 202 - oil outlet of the two-way cartridge valve, 203 - control oil port of the two-way cartridge valve, 3 - oil outlet pipeline, 301 - oil outlet of the oil outlet pipeline, 4 - two-way three-way hydraulic control reversing valve, 401 - control oil port of the two-way three-way hydraulic control reversing valve, 402 - first working oil port, 403 - second working oil port, 404 - third working oil port, 5 - control oil pipeline, 6 - first working oil pipeline, 7 - second working oil pipeline, 701 - oil return port, 8 - third working oil pipeline, 801 - insert type filter, 9 - overflow pipeline, 901 - direct-acting overflow valve, 902 - pressure sensor. Detailed Embodiments

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] The purpose of the present invention is to provide a single-acting motor hydraulic system to solve the problems existing in the prior art, and while meeting the requirements of high pressure and large flow rate of the hydraulic control system, it can prevent the reverse flow of high-pressure oil caused by the reverse rotation of the single-acting motor from impacting the hydraulic control system.

[0027] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] As Figure 1 shown, this embodiment provides a single-acting motor hydraulic system, including an oil inlet pipeline 1, a two-way cartridge valve 2, an oil outlet pipeline 3, and a two-position three-way hydraulic control reversing valve 4. The oil inlet 101 of the oil inlet pipeline is used to connect with the oil port of the main control valve. The oil outlet of the oil inlet pipeline 1 is connected to the oil inlet 201 of the two-way cartridge valve. The oil outlet 202 of the two-way cartridge valve is connected to the oil inlet of the oil outlet pipeline 3. The oil outlet 301 of the oil outlet pipeline is used to connect with the working oil port of the single-acting motor.

[0029] In this embodiment, the control oil port 401 of the two-position three-way hydraulic control reversing valve is connected to the oil inlet pipeline 1 through a control oil pipeline 5; the first working oil port 402 of the two-position three-way hydraulic control reversing valve 4 is connected to the control oil port 203 of the two-way cartridge valve through a first working oil pipeline 6; the second working oil port 403 of the two-position three-way hydraulic control reversing valve 4 is connected with a second working oil pipeline 7. One end of the second working oil pipeline 7 far away from the two-position three-way hydraulic control reversing valve 4 is an oil return port 701, and the oil return port 701 is used to connect with the oil port of the fuel tank; the third working oil port 404 of the two-position three-way hydraulic control reversing valve 4 is connected to the oil outlet pipeline 3 through a third working oil pipeline 8. An in-line filter 801 is provided on the third working oil pipeline 8 in this embodiment.

[0030] In this embodiment, an overflow pipeline 9 is further connected to the oil outlet pipeline 3. One end of the overflow pipeline 9 far away from the oil outlet pipeline 3 is connected to the oil inlet pipeline 1, and a direct-acting overflow valve 901 is provided on the overflow pipeline 9.

[0031] Furthermore, a pressure sensor 902 is also provided at a position on the overflow pipeline 9 between the oil outlet pipeline 3 and the direct-acting overflow valve 901.

[0032] In this embodiment, the oil outlet 301 of the oil outlet pipeline can be connected to the working oil port of the single-acting motor through screws and sealed with an O-ring seal.

[0033] The working process of the single-acting motor hydraulic system provided in this embodiment is as follows:

[0034] This system can implement two hydraulic control oil circuits. One is the normal working oil circuit of the single-acting motor, and the other is the oil pipeline burst oil circuit from the control valve to the explosion-proof valve.

[0035] When the single-acting motor is in a normal working state, a part of the oil from the main control valve enters the two-way cartridge valve 2 through the oil inlet pipeline 1, and another part enters the control oil port 401 of the two-position three-way hydraulic control reversing valve through the control oil pipeline 5. As the oil pressure increases, the two-position three-way hydraulic control reversing valve 4 changes its direction: the first working oil port 402 and the second working oil port 403 open, and the third working oil port 404 closes. At this time, the pressure oil in the spring chamber of the two-way cartridge valve 2 flows back to the oil tank successively through the first working oil pipeline 6, the two-position three-way hydraulic control reversing valve 4, and the second working oil pipeline 7. The spool of the two-way cartridge valve 2 opens, realizing the connection between the oil inlet pipeline 1 and the oil outlet pipeline 3, enabling the oil from the main control valve to enter the single-acting motor, and the single-acting motor runs normally, and the pressure is monitored by the pressure sensor 902 on the overflow pipeline 9.

[0036] When the load controlled by the single-acting motor is overweight or other abnormal factors occur, as the oil pressure increases, the high-pressure pipeline of the main control valve bursts, the pressure at the oil inlet 101 of the oil inlet pipeline drops rapidly, the single-acting motor reverses, and the oil flows reversely. At this time, there is no pressure at the control oil port 401 of the two-position three-way hydraulic control reversing valve, and the two-position three-way hydraulic control reversing valve 4 resets: the first working oil port 402 and the third working oil port 404 open, and the second working oil port 403 closes. A part of the high-pressure oil flowing reversely flows into the spring chamber of the two-way cartridge valve 2 successively through the oil outlet pipeline 3, the third working oil pipeline 8, the two-position three-way hydraulic control reversing valve 4, and the first working oil pipeline 6, thereby quickly closing the two-way cartridge valve 2 to prevent the single-acting motor from reversing and avoid malfunction of the actuator. Another part of the high-pressure oil overflows through the direct-acting overflow valve 901 on the overflow pipeline 9 to achieve buffering and anti-shock effects.

[0037] This system has the following advantages:

[0038] This system utilizes the characteristics of the two-way cartridge valve 2, which has a simple structure, flexible design, good controllability, and can withstand large flow rates and high pressures. It adopts an integrated two-way cartridge valve explosion-proof valve group design, which is directly installed on a single-acting motor. It can achieve the safety protection function of the hydraulic motor while meeting the requirements of high pressure and large flow rate of the hydraulic system, and solves the problems of small flow rate, complex structure, low efficiency, and high cost existing in the existing hydraulic motor explosion-proof devices. For the selection of the two-way cartridge valve 2, those skilled in the art can adjust the diameter of the two-way cartridge valve 2 according to the actual situation to adapt to hydraulic motors with different horsepower requirements, with a wider range of use and stronger adaptability.

[0039] In the present utility model, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. At the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation on the present utility model.

Claims

1. A single-acting motor hydraulic system, characterized in that: It includes an oil inlet pipeline, a two-way cartridge valve, an oil outlet pipeline and a two-position three-way hydraulically controlled reversing valve, wherein the oil inlet of the oil inlet pipeline is used to be connected to the oil port of the main control valve, the oil outlet of the oil inlet pipeline is connected to the oil inlet of the two-way cartridge valve, the oil outlet of the two-way cartridge valve is connected to the oil inlet of the oil outlet pipeline, and the oil outlet of the oil outlet pipeline is used to be connected to the working oil port of the single-acting motor; The control oil port of the two-position three-way hydraulically controlled reversing valve is connected to the oil inlet pipeline through a control oil pipeline; the first working oil port of the two-position three-way hydraulically controlled reversing valve is connected to the control oil port of the two-way cartridge valve through a first working oil pipeline; the second working oil port of the two-position three-way hydraulically controlled reversing valve is connected to a second working oil pipeline, and the end of the second working oil pipeline away from the two-position three-way hydraulically controlled reversing valve is an oil return port, and the oil return port is used to be connected to the oil port of the oil tank; the third working oil port of the two-position three-way hydraulically controlled reversing valve is connected to the oil outlet pipeline through a third working oil pipeline; The oil outlet pipeline is also connected to an overflow pipeline, one end of the overflow pipeline away from the oil outlet pipeline is connected to the oil inlet pipeline, and an overflow valve is arranged on the overflow pipeline.

2. The single-acting motor hydraulic system according to claim 1, characterized in that: The relief valve is a direct-acting relief valve.

3. The single-acting motor hydraulic system according to claim 1, characterized in that: The third working oil pipeline is provided with a filter.

4. The single-acting motor hydraulic system according to claim 3, characterized in that: The filter is a plug-in filter.

5. The single-acting motor hydraulic system according to claim 1, characterized in that: A pressure sensor is also provided on the overflow pipeline at a position between the oil outlet pipeline and the overflow valve.

6. The single-acting motor hydraulic system according to claim 1, characterized in that: The oil outlet of the oil outlet pipeline can be connected to the working oil port of the single-acting motor through a threaded fastener and sealed by a sealing ring.

7. The single-acting motor hydraulic system according to claim 6, characterized in that: The threaded fastener is a screw.

8. The single-acting motor hydraulic system according to claim 6, characterized in that: The sealing ring is an O-type sealing ring.

Images