Exhaust device and hydraulic system with same

Abstract

The utility model relates to the technical field of hydraulic systems, in particular to an exhaust device and a hydraulic system with the exhaust device. An exhaust device is used for a hydraulic system and comprises an exhaust oil tank, an exhaust structure is arranged on the top of the exhaust oil tank, and the exhaust oil tank is communicated with the hydraulic system; the exhaust oil tank is communicated with the oil return tank; the control valve controls connection and disconnection between the exhaust oil tank and the hydraulic system and between the exhaust oil tank and the oil return tank; and the control module controls the state of the control valve according to the liquid level in the exhaust oil tank. The utility model also provides a hydraulic system with the exhaust device, which comprises a hydraulic oil source for pumping out pressure oil; the executing mechanism is communicated with the hydraulic oil source through a pipeline; and the exhaust device is used for exhausting air from the pipeline. The technical problems that in the prior art, exhaust operation is inconvenient, and leakage risks exist are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to an exhaust device and a hydraulic system with the exhaust device. Background Art

[0002] Hydraulic systems are increasingly being used, and the requirements for their stability and control accuracy are becoming increasingly stringent. However, air is inevitably introduced into hydraulic systems during installation, operation, use, and maintenance. For some large-scale equipment, the distance from the hydraulic oil source to the cylinder is long, and the height difference is large. Conventional pipeline flushing and exhaust methods are difficult to completely eliminate the air mixed in the pipeline. When air is contained in the hydraulic system pipeline, it can cause the actuator (such as the cylinder) to move unsteadily and exhibit a creeping phenomenon. For some electro-hydraulic servo systems, the presence of air causes large fluctuations in system pressure, significantly reducing the system's control accuracy. Furthermore, air mixed into the pipeline can increase the wear of seals, reduce the service life of hydraulic components, accelerate the oxidation process of the oil, and generate unnecessary noise and vibration.

[0003] Therefore, it is necessary to vent the pipelines in the hydraulic system. For example, the document with application number CN201721775047.0 discloses an oil pump exhaust device, including an exhaust pipe connected to the pipeline between the outlet of the oil pump and the check valve, one end of the exhaust pipe is connected to the pipeline between the outlet of the oil pump and the check valve, and the other end is connected to the outside world. The gas in the pipeline between the outlet of the oil pump and the check valve can be discharged to the outside world through the exhaust pipe; an exhaust valve is provided on the exhaust pipe, and the exhaust valve is used to control the on-off of the exhaust pipe. When the exhaust valve is opened, the gas in the exhaust pipe can be discharged, that is, the gas in the pipeline between the outlet of the oil pump and the check valve is discharged. The above document adopts the structure of an exhaust pipe and an exhaust valve to vent the pipeline of the oil pump. The exhaust valve adopts a manual mode, which is inconvenient to operate and there is a risk of oil leakage through the exhaust pipe. Utility Model Content

[0004] In order to solve the technical problems in the prior art that exhaust operation is inconvenient and there is a risk of leakage, the utility model provides an exhaust device and a hydraulic system with an exhaust device, which solve the above technical problems.

[0005] In order to solve the above technical problems, the utility model provides an exhaust device for a hydraulic system, comprising:

[0006] An exhaust oil tank, wherein an exhaust structure is provided on the top of the exhaust oil tank, and the exhaust oil tank is connected to the hydraulic system;

[0007] an oil return tank, the exhaust oil tank being in communication with the oil return tank;

[0008] A control valve, which controls the connection and disconnection between the exhaust oil tank, the hydraulic system, and the return oil tank;

[0009] A control module controls the state of the control valve according to the liquid level in the exhaust oil tank.

[0010] According to an embodiment of the present invention, a liquid level sensor is provided in the exhaust oil tank, and the control module obtains liquid level information through the liquid level sensor.

[0011] According to one embodiment of the present utility model, the control valve includes a first control valve and a second control valve, the first control valve controls the connection and disconnection between the exhaust oil tank and the hydraulic system, and the second control valve controls the connection and disconnection between the exhaust oil tank and the return oil tank.

[0012] According to one embodiment of the present invention, the first control valve and the second control valve are electromagnetic ball valves.

[0013] According to one embodiment of the present utility model, during exhaust, when the exhaust oil tank has a low liquid level, the control valve controls the exhaust oil tank to be connected to the hydraulic system, and the gas in the hydraulic system is exhausted through the exhaust oil tank; when the liquid level in the exhaust oil tank reaches a high liquid level, the exhaust work is completed; when the liquid level in the exhaust oil tank reaches an ultra-high liquid level, the control valve controls the exhaust oil tank to be disconnected from the hydraulic system.

[0014] According to one embodiment of the present invention, a one-way valve is further included, through which the fluid of the hydraulic system flows into the exhaust oil tank in a one-way manner.

[0015] According to one embodiment of the present invention, the exhaust structure includes an air filter, and the air inside and outside the exhaust oil tank is exchanged through the air filter.

[0016] According to one embodiment of the present invention, a liquid level gauge is provided on the exhaust oil tank.

[0017] The utility model also provides a hydraulic system with an exhaust device, comprising:

[0018] Hydraulic oil source, pumping out pressure oil;

[0019] an actuator, the actuator being connected to the hydraulic oil source through a pipeline;

[0020] An exhaust device is used to exhaust the pipeline.

[0021] According to an embodiment of the present invention, a throttle valve is provided on the pipeline, and an outlet of the throttle valve is communicated with the exhaust device.

[0022] Based on the above technical solution, the technical effects that can be achieved by the present invention are:

[0023] 1. The exhaust device of the present invention can realize automatic control of the exhaust device by setting the exhaust oil tank, the hydraulic system and the return oil tank to be connected, and the control module controls the state of the control valve according to the liquid level in the exhaust oil tank, and further controls the connection and disconnection between the exhaust oil tank, the hydraulic system and the return oil tank. When the liquid level in the exhaust oil tank is at a low level, the control valve can control the gas in the hydraulic system to enter the exhaust oil tank for exhaust. When the liquid level in the exhaust oil tank rises to a high level, the exhaust work is completed; when the oil in the exhaust oil tank continues to rise and reaches an ultra-high level, the control valve can control the disconnection between the hydraulic system and the exhaust oil tank to prevent the oil from continuing to enter the exhaust oil tank and overflow. The control valve can also control the connection between the exhaust oil tank and the return oil tank to drain the oil in the exhaust oil tank to a low level, which is convenient for multiple exhausts;

[0024] 2. In the exhaust device of the present invention, a liquid level sensor is installed in the exhaust tank, and the first control valve and the second control valve are electromagnetic ball valves. The control module can obtain the liquid level information in the exhaust tank through the liquid level sensor, and then control the status of the first control valve and the second control valve, thereby realizing automatic control without manual operation;

[0025] 3. The exhaust device of this utility model includes a one-way valve, which can realize the one-way flow of fluid from the hydraulic system to the exhaust tank, while preventing the oil or air in the exhaust tank from flowing back into the hydraulic system, protecting the oil in the hydraulic system from contamination. The exhaust structure includes an air filter, which not only maintains the atmospheric pressure balance inside and outside the exhaust tank, but also filters impurities in the air to prevent oil contamination. It is also equipped with a liquid level gauge, which can visually observe the liquid level in the exhaust tank. It is used in conjunction with manual emergency exhaust when the electronic control system fails.

[0026] 4. The hydraulic system with an exhaust device of the present invention is provided with a throttle valve on the pipeline, and the outlet of the throttle valve is connected to the exhaust device. When the pipeline needs to be exhausted, the throttle valve opens a suitable opening to exhaust the pipeline; when the pipeline is exhausted, the throttle valve is closed to prevent gas from entering the pipeline again. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a hydraulic principle diagram of a hydraulic system with an exhaust device of the present utility model;

[0028] Figure 2 This is a flow chart of automatic exhaust for a hydraulic system with an exhaust device;

[0029] Figure 3 Manual exhaust flow chart for hydraulic system with exhaust device;

[0030] In the picture:

[0031] 10-Exhaust device; 1-Exhaust oil tank; 2-Exhaust structure; 21-Air filter; 3-Return oil tank; 4-Control valve; 41-First control valve; 42-Second control valve; 5-Control module; 6-Liquid level sensor; 7-Check valve; 8-Liquid level gauge;

[0032] Hydraulic oil source; 201- oil tank; 202- pump; 203- safety valve;

[0033] 30-actuator; 301-actuator cylinder; 302-main control valve;

[0034] 40-Pipeline; 401-Throttle valve. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to actual proportional relationships. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0038] In the description of the present invention, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0039] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0040] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0041] like Figure 1 As shown, this embodiment provides an exhaust device 10, comprising an exhaust tank 1, equipped with an exhaust structure 2. The exhaust tank 1 is connected to a hydraulic system and a return tank 3. A control valve 4 controls the connection between the exhaust tank 1, the hydraulic system, and the return tank 3. A control module 5 controls the state of the control valve 4 based on the liquid level within the exhaust tank 1. When the control valve 4 connects the exhaust tank 1 to the hydraulic system, gas in the hydraulic system can enter the exhaust tank 1 and be discharged through the exhaust structure 2. When the control valve 4 connects the exhaust tank 1 to the return tank 3, the oil in the exhaust tank 1 can be discharged into the return tank 3 to control the liquid level within the exhaust tank 1.

[0042] Exhaust tank 1 has an internal cavity and an inlet and outlet at its bottom. The inlet communicates with the hydraulic system, while the outlet communicates with return tank 3. Exhaust structure 2 is located at the top of exhaust tank 1. Gas in the hydraulic system enters exhaust tank 1 through the inlet and is discharged through exhaust structure 2. The oil in exhaust tank 1 flows through the outlet to return tank 3. Gas and some oil in the hydraulic system are discharged through exhaust tank 1, preventing direct contact between the hydraulic system oil and the outside world and ensuring oil cleanliness.

[0043] The exhaust structure 2 includes an air filter 21. On the one hand, the air filter 21 can achieve air pressure balance inside and outside the exhaust oil tank 1; on the other hand, the air filter 21 can filter impurities in the air to avoid contamination of the oil.

[0044] The control valve 4 is used to control the flow between the exhaust tank 1 and the hydraulic system and the return tank 3. The control valve 4 can adopt an integrated valve body structure or be configured as two valve bodies, each controlling the flow. In this embodiment, the control valve 4 includes a first control valve 41 and a second control valve 42. The first control valve 41 controls the flow between the exhaust tank 1 and the hydraulic system, while the second control valve 42 controls the flow between the exhaust tank 1 and the return tank 3.

[0045] As a preferred technical solution of this embodiment, the first control valve 41 and the second control valve 42 may be, but are not limited to, solenoid ball valves. In the event of a malfunction in the electronic control system, the first and second control valves 41, 42 can be manually opened and closed. The first control valve 41 can be configured as a two-position, two-way valve. When in the first position, the exhaust tank 1 is connected to the hydraulic system; when in the second position, the exhaust tank 1 is disconnected from the hydraulic system. The first control valve 41 can be controlled to be in the first position when energized and in the second position when de-energized, or in the second position when energized and in the first position when de-energized. The second control valve 42 can also be configured as a two-position, two-way valve. When in the first position, the exhaust tank 1 is connected to the return tank 3; when in the second position, the exhaust tank 1 is disconnected from the return tank 3. The second control valve 42 can be controlled to be in the first position when energized and in the second position when de-energized, or in the second position when energized and in the first position when de-energized.

[0046] The control module 5 controls the switching of the first and second control valves 41 and 42 based on the liquid level in the exhaust tank 1. A liquid level sensor 6 is provided within the exhaust tank 1, and the control module 5 obtains information about the liquid level within the exhaust tank 1 from the sensor. The control module 5 receives signals from the sensor 6 and controls the switching of the first and second control valves 41 and 42 to execute the automatic control program for the exhaust device 10.

[0047] As a preferred technical solution of this embodiment, the liquid level sensor 6 has three switching points: a low liquid point corresponding to a low liquid level, a high liquid point corresponding to a high liquid level, and an ultra-high liquid point corresponding to an ultra-high liquid level. The low liquid point serves as the reset point for the exhaust device (i.e., the initial position for exhaust operation); the high liquid point serves as an alarm point. When the gas from the hydraulic system is exhausted, some oil is drawn into the exhaust tank 1. When the oil reaches the high liquid level, an alarm is triggered, reminding the operator that the exhaust operation is about to end. The high liquid point serves as a cut-off point. At this point, the oil in the exhaust tank 1 is too high to prevent oil overflow. When this point is reached, the first control valve 41 is controlled to automatically cut off the connection between the hydraulic system and the exhaust tank 1. Under normal circumstances, when the oil reaches the ultra-high liquid level, the air in the hydraulic system has been fully exhausted.

[0048] A one-way valve 7 is provided between the hydraulic system and the exhaust tank 1. This valve controls the one-way flow of hydraulic system fluid into the exhaust tank 1, preventing the oil or air in the exhaust tank 1 from flowing back into the hydraulic system, thereby protecting the hydraulic system's oil from contamination. Preferably, the one-way valve 7 is located between the first control valve 41 and the hydraulic system.

[0049] The exhaust tank 1 is also provided with a liquid level gauge 8, which can visually observe the liquid level in the exhaust tank 1. Like the liquid level sensor 6, low liquid level, high liquid level and ultra-high liquid level marks are set near the liquid level gauge 8. It is used when the electronic control system fails and manual emergency exhaust is adopted.

[0050] This embodiment also provides a hydraulic system with an exhaust device, including a hydraulic oil source 20, an actuator 30 and an exhaust device 10. The actuator 30 and the hydraulic oil source 20 are connected by a pipeline 40. The hydraulic oil source 20 pumps out pressurized oil and supplies it to the actuator 30 through the pipeline 40 to drive the actuator 30 to work; the exhaust device 10 exhausts the pipeline 40.

[0051] A throttle valve 401 is provided on pipeline 40, the outlet of which is connected to exhaust device 10. When pipeline 40 needs to be vented, the outlet of throttle valve 401 is connected to exhaust device 10 and the appropriate opening is opened. After venting is complete, throttle valve 401 is closed to prevent gas from re-entering system pipeline 40. Preferably, throttle valve 401 is placed at a location on pipeline 40 where gas is likely to converge, such as the highest point of pipeline 40.

[0052] The hydraulic oil source 20 includes an oil tank 201 and a pump 202 . Under the action of the pump 202 , the oil in the oil tank 201 can be pumped out into the pipeline 40 and pumped to the actuator 30 .

[0053] As the preferred technical solution of this embodiment, in order to ensure that the system pressure is not too high, the pump outlet of the pump 202 is connected to a safety oil circuit, and a safety valve 203 is provided on the safety oil circuit. When the system pressure exceeds the threshold, the pressure oil can be discharged to the oil tank 201 through the safety oil circuit and the safety valve 203.

[0054] The actuator 30 includes an actuator cylinder 301 and a main control valve 302 . The main control valve 302 controls the pressure oil to enter the actuator cylinder 301 to drive the actuator cylinder 301 to work.

[0055] Based on the above technical solution, Figure 2 As shown, the automatic exhaust process of the hydraulic system with the exhaust device of this embodiment is as follows:

[0056] 1. Preparation

[0057] Connect the exhaust device 10 to the outlet of the throttle valve 401 reserved on the hydraulic system pipeline 40, and open the throttle valve 401 to a suitable opening. Start the hydraulic oil source 20 and build up pressure to keep the hydraulic system pipeline 40 in a low oil pressure state.

[0058] 2. Automatic exhaust stage

[0059] a. Start the automatic exhaust procedure;

[0060] b. The control module 5 receives the signal from the liquid level sensor 6 and determines the oil level in the exhaust oil tank 1. If the liquid level is at or below the low level, the program proceeds to the next step. If the liquid level is above the low level, the second control valve 42 is energized and opened, and the oil in the exhaust oil tank 1 flows into the return oil tank 3 through the second control valve 42 until the liquid level reaches the low level. The second control valve 42 then loses power and closes, disconnecting the exhaust oil tank 1 from the return oil tank 3, and the program proceeds to the next step.

[0061] c. The first control valve 41 is energized and opens. The gas in the hydraulic system pipeline 40 enters the exhaust tank 1 through the throttle valve 401, the one-way valve 7, and the first control valve 41, and is discharged through the air filter 21 on the exhaust tank 1. The gas in the hydraulic system pipeline 40 enters the exhaust tank 1, along with some oil, causing the liquid level in the tank 1 to gradually rise. After most of the gas is discharged from the pipeline 40, the oil in the pipeline 40 enters the exhaust tank 1 through the throttle valve 401, the one-way valve 7, and the first control valve 41. At this time, the oil level in the exhaust tank 1 rises rapidly. When the high liquid level is reached, an alarm is sounded, notifying the operator that the exhaust work is about to be completed.

[0062] d. When the oil in the exhaust oil tank 1 continues to rise and reaches an ultra-high liquid level, the first control valve 41 loses power and closes, preventing the oil in the exhaust oil tank 1 from continuing to rise, preventing the oil from overflowing, and protecting the working environment from being polluted by the oil.

[0063] eAt this point, one exhaust operation is completed.

[0064] 3. Repeat the exhaust several times

[0065] If strict requirements are placed on the gas content in the pipeline 40 , the automatic exhaust procedure may be repeated several times until the gas in the pipeline 40 is fully exhausted.

[0066] like Figure 3 As shown in the figure, the manual emergency exhaust process of the hydraulic system is as follows:

[0067] 1. Preparation

[0068] Connect the exhaust device 10 to the outlet of the throttle valve 401 reserved on the hydraulic system pipeline 40, and open the throttle valve 401 to a suitable opening. Start the hydraulic oil source 20 and build up pressure to keep the hydraulic system pipeline 40 in a low oil pressure state.

[0069] 2. Manual emergency exhaust stage

[0070] a Visually observe the level gauge 8 to observe the oil level in the exhaust oil tank 1. If the level is at or below the low level, proceed to the next step. If the level is higher than the low level, manually open the second control valve 42, and the oil in the exhaust oil tank 1 flows into the return oil tank 3 through the second control valve 42 until the level reaches the low level. Manually close the second control valve 42, disconnect the exhaust oil tank 1 from the return oil tank 3, and proceed to the next step.

[0071] b. The first control valve 41 is manually opened, and the gas in the hydraulic system pipeline 40 enters the exhaust tank 1 through the throttle valve 401, the one-way valve 7, and the first control valve 41, and is discharged through the air filter 21 on the exhaust tank 1. The gas in the hydraulic system pipeline 40 enters the exhaust tank 1, carrying with it some oil, causing the liquid level in the tank 1 to gradually rise. After most of the gas is discharged from the pipeline 40, the oil in the pipeline 40 enters the exhaust tank 1 through the throttle valve 401, the one-way valve 7, and the first control valve 41. At this time, the oil level in the exhaust tank 1 rises rapidly. When it reaches the high level, it indicates that the exhaust operation is about to be completed;

[0072] c When the oil in the exhaust oil tank 1 continues to rise and reaches an ultra-high liquid level, the first control valve 41 is manually closed to prevent the oil in the exhaust oil tank 1 from continuing to rise, prevent the oil from overflowing, and protect the working environment from being polluted by the oil.

[0073] dAt this point, one exhaust operation is completed.

[0074] 3. Repeat the exhaust several times

[0075] If strict requirements are placed on the gas content in the pipeline 40 , the manual emergency exhaust can be repeated several times until the gas in the pipeline 40 is fully exhausted.

[0076] The embodiments of the present application are described in detail above with reference to the accompanying drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.

Claims

1. An exhaust device for a hydraulic system, characterized in that: include: An exhaust oil tank (1), wherein an exhaust structure (2) is provided on the top of the exhaust oil tank (1), and the exhaust oil tank (1) is connected to the hydraulic system; An oil return tank (3), wherein the exhaust oil tank (1) is in communication with the oil return tank (3); A control valve (4), the control valve (4) controls the on-off connection between the exhaust oil tank (1) and the hydraulic system and the return oil tank (3); A control module (5) controls the state of the control valve (4) according to the liquid level in the exhaust oil tank (1).

2. An exhaust device according to claim 1, characterized in that: A liquid level sensor (6) is provided in the exhaust oil tank (1), and the control module (5) obtains liquid level information through the liquid level sensor (6).

3. An exhaust device according to claim 1, characterized in that: The control valve (4) comprises a first control valve (41) and a second control valve (42), wherein the first control valve (41) controls the on-off between the exhaust oil tank (1) and the hydraulic system, and the second control valve (42) controls the on-off between the exhaust oil tank (1) and the return oil tank (3).

4. An exhaust device according to claim 3, characterized in that: The first control valve (41) and the second control valve (42) are electromagnetic ball valves.

5. An exhaust device according to any one of claims 1 to 4, characterized in that: During exhaust, when the exhaust oil tank (1) has a low liquid level, the control valve (4) controls the exhaust oil tank (1) to be connected to the hydraulic system, and the gas in the hydraulic system is exhausted through the exhaust oil tank (1); when the liquid level in the exhaust oil tank (1) reaches a high liquid level, the exhaust work is completed; when the liquid level in the exhaust oil tank (1) reaches an ultra-high liquid level, the control valve (4) controls the exhaust oil tank (1) to be disconnected from the hydraulic system.

6. An exhaust device according to claim 1, characterized in that: It also includes a one-way valve, through which the fluid of the hydraulic system flows into the exhaust oil tank (1) in a one-way direction.

7. An exhaust device according to claim 1, characterized in that: The exhaust structure (2) includes an air filter (21), and the air inside and outside the exhaust oil tank (1) is exchanged through the air filter (21).

8. An exhaust device according to claim 1, characterized in that: The exhaust oil tank (1) is provided with a liquid level gauge (8).

9. A hydraulic system with an exhaust device, characterized in that: include: A hydraulic oil source (20) pumps out pressure oil; an actuator (30), the actuator (30) being in communication with the hydraulic oil source (20) via a pipeline (40); The exhaust device according to any one of claims 1 to 8, wherein the exhaust device exhausts the pipeline (40).

10. A hydraulic system with an exhaust device according to claim 9, characterized in that: A throttle valve (401) is provided on the pipeline (40), and an outlet of the throttle valve (401) is communicated with the exhaust device.

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