Hydraulic system

Abstract

The embodiment of the invention relates to the technical field of hydraulic pressure, and discloses a hydraulic system which comprises an oil tank, an oil inlet pipeline, an execution mechanism, an oil return pipeline and a detection mechanism. One end of the oil inlet pipeline communicates with the oil tank; the executing mechanism communicates with the other end of the oil inlet pipeline, and the oil inlet pipeline is used for conveying hydraulic oil to the executing mechanism to push the executing mechanism to move; one end of the oil return pipeline is communicated with the executing mechanism, and the other end of the oil return pipeline is communicated with the oil tank; the detection mechanism communicates with the oil tank and is used for detecting hydraulic oil in the oil tank. By means of the mode, hydraulic oil in the oil tank which is the same as the atmospheric pressure in pressure and relatively stable in temperature can be detected, and the influence of great changes of the pressure and the temperature on hydraulic oil detection can be reduced; and the detection reliability and effectiveness can be improved.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of hydraulic technology, and in particular, to a hydraulic system. Background Art

[0002] The hydraulic system of construction machinery uses hydraulic oil as the power transmission medium. The quality of the hydraulic oil affects the performance of the hydraulic system. Therefore, it is necessary to monitor the hydraulic oil in the hydraulic system, and to effectively control and manage the hydraulic system based on the monitoring data to ensure the normal operation of the hydraulic system.

[0003] In the related art, sensors are usually set on the oil return pipeline of the hydraulic system, and the data of the hydraulic oil, such as viscosity, density, temperature and the like, are collected through the sensors.

[0004] During the implementation of the embodiments of the present application, the inventors found that when the sensor is set on the oil return pipeline, the pressure on the pipeline is high and unstable, which has a huge impact on the detection results and is likely to cause certain damage to the detection equipment. Summary of the invention

[0005] The main technical problem solved by the embodiments of the present application is to provide a hydraulic system that can detect hydraulic oil in an oil tank that is at the same pressure as atmospheric pressure and at a relatively stable temperature, thereby reducing the impact of large changes in pressure and temperature on the hydraulic oil detection results; and is beneficial to improving the reliability and effectiveness of detection; and enables the detection mechanism to perform oil extraction and return testing in a better test environment, making the test results more representative.

[0006] To solve the above technical problems, a technical solution adopted in an embodiment of the present application is: a hydraulic system is provided, including an oil tank, an oil inlet pipeline, an actuator, an oil return pipeline and a detection mechanism, wherein the oil tank is used to store hydraulic oil; one end of the oil inlet pipeline is connected to the oil tank; the actuator is connected to the other end of the oil inlet pipeline, and the oil inlet pipeline is used to transport the hydraulic oil to the actuator to promote the movement of the actuator; one end of the oil return pipeline is connected to the actuator, and the other end is connected to the oil tank, and the oil return pipeline is used to transport the hydraulic oil in the actuator to the oil tank; the detection mechanism is connected to the oil tank, and the detection mechanism is used to detect the hydraulic oil in the oil tank.

[0007] In some embodiments, the detection mechanism includes a detection device, a sampling oil circuit and a return sample oil circuit. One end of the sampling circuit is connected to the oil tank, and the other end of the sampling circuit is connected to the detection device. One end of the return sample oil circuit is connected to the detection device, and the other end of the return sample oil circuit is connected to the oil tank. The detection device is used to detect hydraulic oil.

[0008] In some embodiments, the oil tank includes a body and a cleaning orifice plate, the cleaning orifice plate is detachably mounted on the body, and the sampling oil circuit and the sample return oil circuit are both arranged through the cleaning orifice plate.

[0009] In some embodiments, the sampling circuit has an oil inlet located below a minimum liquid level in the oil tank.

[0010] In some embodiments, the sample return oil circuit has an oil outlet, and the oil outlet is located above the highest liquid level in the oil tank.

[0011] In some embodiments, the oil tank is provided with a baffle, which divides the internal space of the oil tank into a first cavity and a second cavity that are interconnected, the oil inlet pipeline is connected to the first cavity, and the oil return pipeline is connected to the second cavity.

[0012] In some embodiments, the oil inlet of the sampling oil circuit is located in the second cavity.

[0013] In some embodiments, the oil inlet pipeline includes a first filter, the first filter is located in the first cavity, and the first filter is used to filter the hydraulic oil entering the oil inlet pipeline.

[0014] In some embodiments, the oil inlet pipeline includes a booster pump, which is disposed between the first filter and the actuator, and is used to drive the hydraulic oil into the actuator.

[0015] In some embodiments, the oil inlet pipeline includes a pressure-limiting valve, which is disposed between the booster pump and the actuator, and is used to limit the maximum pressure of the hydraulic oil in the actuator.

[0016] The beneficial effects of the embodiments of the present application are as follows: different from the prior art, in the embodiments of the present application, by connecting the detection mechanism with the oil tank, compared with the method of setting the detection mechanism in the oil return line to detect the hydraulic oil, the hydraulic oil contacted by the detection mechanism is the same as the atmospheric pressure and the temperature of the hydraulic oil in the oil tank is relatively stable, which is beneficial to reduce the impact of large changes in pressure and temperature on the hydraulic oil detection; furthermore, the pressure of the hydraulic oil in the oil tank is relatively low, which is beneficial to reduce the impact of the hydraulic oil on the detection mechanism and reduce the risk of damage to the sealing components in the detection mechanism; in addition, directly taking oil and returning oil from the oil tank can enable the detection mechanism to be tested in a better test environment, so that the test results are more representative. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0018] Figure 1 It is a schematic diagram of the mechanism of the hydraulic system provided in the embodiment of the present application.

[0019] Description of symbols

[0020] DETAILED DESCRIPTION

[0021] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element or there can be one or more centered elements therebetween. When an element is described as "connected" to another element, it can be directly connected to another element or there can be one or more centered elements therebetween. The orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "vertical", "horizontal", etc. used in this specification is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0023] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0024] See also Figure 1The hydraulic system 100 includes an oil tank 1, an oil inlet pipeline 2, an actuator 3, an oil return pipeline 4 and a detection mechanism 5. The oil tank 1 is used to store hydraulic oil. One end of the oil inlet pipeline 2 is connected to the oil tank 1, and the other end is connected to the actuator 3. The oil inlet pipeline 2 is used to pressurize the hydraulic oil in the oil tank 1 and transport it to the actuator 3, thereby driving the actuator 3 to move. One end of the oil return pipeline 4 is connected to the actuator 3, and the other end is connected to the oil tank 1. The oil return pipeline 4 is used to transport the hydraulic oil in the actuator 3 to the oil tank 1, so as to achieve the purpose of recycling the hydraulic oil. The detection mechanism 5 is connected to the oil tank 1 so that the hydraulic oil in the oil tank 1 can flow to the detection mechanism 5, so that the detection mechanism 5 can detect the hydraulic oil in the oil tank 1. In this embodiment, by connecting the detection mechanism 5 with the oil tank 1, compared with the method of setting the detection mechanism 5 in the oil return pipeline 4 to detect the hydraulic oil, the pressure of the hydraulic oil in the detection mechanism 5 is lower, which is beneficial to reducing the risk of damage to the internal sealing components of the detection mechanism 5 under high pressure, thereby extending the life of the detection mechanism 5; in addition, the detection mechanism of the present application can take oil and return oil for testing in a better testing environment, so that the test results are more representative.

[0025] It is worth noting that during the operation of the hydraulic system 100, the temperature of the hydraulic oil in the oil inlet pipeline 2, the actuator 3 and the oil return pipeline 4 changes greatly during the flow. The method of performing detection on the oil return pipeline 4 adopted in the prior art is likely to lead to inaccurate detection results. Therefore, in the present application, by connecting the detection mechanism 5 with the oil tank 1, the detection mechanism 5 can be detected in an environment with relatively stable temperature, which is beneficial to reduce the impact of temperature changes on the hydraulic oil detection results.

[0026] In some embodiments, the detection mechanism 5 includes a detection device 51, a sampling oil circuit 52 and a sample return oil circuit 53. One end of the sampling oil circuit 52 is connected to the oil tank 1, and the other end of the sampling oil circuit 52 is connected to the detection device 51, so that the hydraulic oil in the oil tank 1 can flow to the detection device 51 through the sampling oil circuit 52. The detection device 51 is used to detect the parameters of the hydraulic oil, including the density, viscosity, temperature, etc. of the hydraulic oil. One end of the sample return oil circuit 53 is connected to the detection device 51, and the other end of the sample return oil circuit 53 is connected to the oil tank 1, so that the hydraulic oil in the detection device 51 can flow back to the oil tank 1 through the sample return oil circuit 53. In this embodiment, by setting the sampling oil circuit 52 and the sample return oil circuit 53, and connecting the oil tank 1, the sampling oil circuit 52, the detection device 51 and the sample return oil circuit 53 in sequence to form a circulation loop, the detection device 51 can cyclically detect the parameters of the hydraulic oil, which is conducive to improving the accuracy of the detection.

[0027] In some embodiments, the oil tank 1 includes a main body 11 and a cleaning orifice plate 12. The main body 11 constitutes the main structure of the oil tank 1. The cleaning orifice plate 12 can be detachably installed on the main body 11, and a sealed connection is formed between the cleaning orifice plate 12 and the main body 11. The cleaning orifice plate 12 can be detached. When it is necessary to clean the inside of the oil tank 1, the cleaning orifice plate 12 can be removed to facilitate the cleaning of the inside of the oil tank 1.

[0028] In some embodiments, the sampling oil path 52 is disposed through the cleaning orifice plate 12 , so that the sampling oil path 52 is connected to the interior of the oil tank 1 , facilitating the hydraulic oil to flow through the sampling oil path 52 to the detection device 51 .

[0029] In some embodiments, the sample return oil passage 53 is disposed through the cleaning orifice plate 12 , so that the sample return oil passage 53 is connected to the interior of the oil tank 1 , thereby facilitating the hydraulic oil in the detection device 51 to flow back into the oil tank 1 .

[0030] In some embodiments, the sampling oil circuit 52 has an oil inlet 521, which is located at one end of the sampling oil circuit 52 away from the detection device 51, and the oil inlet 521 is located in the oil tank 1, and the oil inlet 521 is located below the lowest liquid level H in the oil tank 1. The lowest liquid level refers to the plane where the hydraulic oil level is located when the hydraulic oil required to be stored in the oil tank 1 is the minimum when the hydraulic system 100 can work normally. By arranging the oil inlet 521 below the minimum liquid level H, even if the hydraulic oil in the oil tank 1 is the minimum, the hydraulic oil can enter the sampling oil circuit 52 through the oil inlet 521, and thus be detected by the detection device 51.

[0031] In some embodiments, the return sample oil circuit 53 has an oil outlet 531, which is located at one end of the return sample oil circuit 53 away from the detection device 51, and the oil outlet 531 is located in the oil tank 1, and the oil outlet 531 is located above the highest liquid level F in the oil tank 1. Generally speaking, the hydraulic oil in the oil tank 1 is not filled up, but a maximum oil storage capacity is set in the oil tank 1. When the oil volume reaches the maximum oil storage capacity, the plane where the hydraulic oil level is located is the highest liquid level F. In this embodiment, by setting the oil outlet 531 above the highest liquid level, the risk of the hydraulic oil in the oil tank 1 generating resistance from the oil outlet 531 and flowing back into the return sample oil circuit 53 can be reduced.

[0032] In some embodiments, the oil tank 1 is provided with a baffle 13, which divides the internal space of the oil tank 1 into a first cavity 14 and a second cavity 15 that are interconnected. The oil inlet line 2 is connected to the first cavity 14, and the oil return line 4 is connected to the second cavity 15. That is, the oil inlet line 2 delivers the hydraulic oil from the first cavity 14 to the actuator 3, and the hydraulic oil passing through the actuator 3 flows back to the second cavity 15 through the oil return line 4. By providing the baffle 13, the hydraulic oil returning from the actuator 3 can be filtered and then enter the first cavity 14 to be absorbed by the oil inlet line 2, which can improve the cleanliness of the hydraulic oil entering the actuator 3, which is conducive to improving the performance of the hydraulic system 100 and extending its service life. In addition, when the vehicle equipped with the hydraulic system 100 is turning, the baffle 13 can offset part of the kinetic energy of the hydraulic oil, avoiding the situation where the hydraulic oil tilts all toward one side and causes the oil tank 1 or the vehicle to roll over, thereby improving safety.

[0033] In some embodiments, the oil inlet 521 of the sampling oil circuit 52 is located in the second cavity 15. Since the rate at which the oil inlet line 2 extracts hydraulic oil is greater than the flow rate of the hydraulic oil in the sampling oil circuit 52, by setting the oil inlet 521 of the sampling line in the second cavity 15, the oil inlet 521 is kept away from the oil inlet line 2, which helps to reduce the influence of the oil inlet line 2 on the hydraulic oil entering the sampling line, so that the hydraulic oil can flow smoothly into the sampling line. In addition, since the return oil line 4 is connected to the second cavity 15, the hydraulic oil entering the sampling oil circuit 52 is not filtered by the baffle 13, which helps to improve the accuracy of the detection.

[0034] In some embodiments, the oil inlet pipe includes a first filter 21 . The first filter 21 is located in the first cavity 14 . The first filter 21 can filter the hydraulic oil entering the oil inlet pipeline 2 , thereby protecting the oil inlet pipeline 2 .

[0035] In some embodiments, the oil inlet pipeline 2 further includes a boost pump 22 , which is disposed between the first filter 21 and the actuator 3 . The boost pump 22 is used to drive the hydraulic oil into the actuator 3 , thereby driving the actuator 3 to move.

[0036] In some embodiments, the oil inlet pipeline 2 also includes a pressure limiting valve 23, which is arranged between the boost pump 22 and the actuator 3. The pressure limiting valve 23 is used to limit the maximum pressure of the hydraulic oil in the actuator 3 to reduce the risk of safety accidents caused by excessive oil pressure.

[0037] Furthermore, the pressure limiting valve 23 is also connected to the oil tank 1. When the oil pressure is greater than the maximum pressure of the pressure limiting valve 23, part of the hydraulic oil in the pressure limiting valve 23 directly flows back to the oil tank 1, thereby releasing part of the oil pressure to achieve a pressure limiting effect.

[0038] In some embodiments, the oil inlet pipeline 2 also includes a second filter 24, which is arranged between the boost pump 22 and the pressure limiting valve 23. The second filter 24 is used to further filter the hydraulic oil, thereby improving the cleanliness of the hydraulic oil entering the pressure limiting valve 23 and the actuator 3.

[0039] In some embodiments, the first filter 21 and the boost pump 22, the boost pump 22 and the second filter 24, the second filter 24 and the pressure limiting valve 23, the pressure limiting valve 23 and the actuator 3, and the pressure limiting valve 23 and the oil tank 1 are all connected through pipelines.

[0040] In some embodiments, a multi-channel pipeline output can be set on the side of the pressure limiting valve 23 away from the second filter 24. There are multiple actuators 3, and one pipeline corresponds to one actuator 3, so that the hydraulic system 100 can drive multiple actuators 3 to move.

[0041] In some embodiments, the oil inlet pipeline 2 further includes a plurality of control valves 25 , one control valve 25 corresponds to one actuator 3 , and the control valve 25 is used to control the actuator 3 , and the movement of each actuator 3 is controlled by the plurality of control valves 25 .

[0042] In some embodiments, the oil tank 1 is provided with an air valve 16, which is arranged on the upper surface of the oil tank 1. The air valve 16 is used to compensate for the air inside the oil tank 1 to avoid the pressure difference between the inside and outside of the oil tank 1 and affect the flow of hydraulic oil.

[0043] In the embodiment of the present application, by connecting the detection mechanism 5 with the oil tank 1, compared with the method of setting the detection mechanism 5 in the oil return pipeline 4 to detect the hydraulic oil, the pressure of the hydraulic oil in the detection mechanism 5 is lower, which is beneficial to reducing the risk of damage to the sealing components inside the detection mechanism 5 under high pressure, thereby extending the life of the detection mechanism 5, and enabling the detection mechanism to perform oil extraction and return testing in a better testing environment, making the test results more representative; in addition, the detection mechanism 5 of the present application can detect the hydraulic oil in the oil tank 1 at a pressure equal to atmospheric pressure and a relatively stable temperature, which can reduce the impact of large changes in pressure and temperature on hydraulic oil detection.

[0044] The above descriptions are merely embodiments of the present application and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A hydraulic system, characterized in that: include: Oil tank, used to store hydraulic oil; an oil inlet pipeline, one end of which is connected to the oil tank; an actuator, connected to the other end of the oil inlet pipeline, wherein the oil inlet pipeline is used to deliver the hydraulic oil to the actuator to drive the actuator to move; an oil return pipeline, one end of which is connected to the actuator and the other end of which is connected to the oil tank, the oil return pipeline being used to transport the hydraulic oil in the actuator to the oil tank; The detection mechanism is connected to the oil tank, and the detection mechanism is used to detect the hydraulic oil in the oil tank.

2. The hydraulic system according to claim 1, characterized in that: The detection mechanism includes a detection device, a sampling oil circuit and a return sample oil circuit. One end of the sampling circuit is connected to the oil tank, and the other end of the sampling circuit is connected to the detection device. One end of the return sample oil circuit is connected to the detection device, and the other end of the return sample oil circuit is connected to the oil tank. The detection device is used to detect the hydraulic oil.

3. The hydraulic system according to claim 2, characterized in that: The oil tank comprises a body and a cleaning orifice plate, wherein the cleaning orifice plate is detachably mounted on the body, and the sampling oil passage and the sample return oil passage are both arranged through the cleaning orifice plate.

4. The hydraulic system according to claim 2, characterized in that: The sampling circuit has an oil inlet located below the lowest liquid level in the oil tank.

5. The hydraulic system according to claim 2, characterized in that: The sample return oil circuit has an oil outlet, and the oil outlet is located above the highest liquid level in the oil tank.

6. The hydraulic system according to claim 4, characterized in that: The oil tank is provided with a baffle, which divides the internal space of the oil tank into a first cavity and a second cavity that are connected to each other. The oil inlet pipeline is connected to the first cavity, and the oil return pipeline is connected to the second cavity.

7. The hydraulic system according to claim 6, characterized in that: The oil inlet of the sampling oil circuit is located in the second cavity.

8. The hydraulic system according to claim 6, characterized in that: The oil inlet pipeline comprises a first filter, the first filter is located in the first cavity, and the first filter is used to filter the hydraulic oil entering the oil inlet pipeline.

9. The hydraulic system according to claim 8, characterized in that: The oil inlet pipeline includes a booster pump, which is arranged between the first filter and the actuator, and is used to drive the hydraulic oil into the actuator.

10. The hydraulic system according to claim 9, characterized in that: The oil inlet pipeline includes a pressure-limiting valve, which is arranged between the booster pump and the actuator, and is used to limit the maximum pressure of the hydraulic oil in the actuator.

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