Grain tank lifting hydraulic control system

Abstract

The utility model provides a grain tank lifting hydraulic control system which comprises an oil tank, a driving adjusting module and a grain unloading module, the grain unloading module is connected with the oil tank through the driving adjusting module, the grain unloading module comprises an oil cylinder unit and an oil supplementing unit, and the oil supplementing unit is communicated with a rodless cavity and a rod cavity of the oil cylinder unit. And the hydraulic oil in the rodless cavity can flow to the rod cavity. According to the hydraulic control system for lifting the grain tank, in the falling process of the grain tank, oil in the rodless cavity of the grain unloading oil cylinder can be supplemented into the rod cavity, empty suction of the rod cavity is avoided, the stability of the hydraulic system is enhanced, the jitter phenomenon in the falling process of the grain tank is avoided, vibration and noise of a vehicle are reduced, and the risk that structural parts near the grain tank are damaged is reduced; the problem of repeated opening and closing of the hydraulic lock of the working valve can be effectively solved, pressure impact in a pipeline behind the valve is avoided, the risk of leakage of a hydraulic system is reduced, and the stability and reliability of the hydraulic system are enhanced.

Description

Technical Field

[0001] This application relates to the field of hydraulic control systems, and particularly to a hydraulic control system for lifting a grain tank. Background Art

[0002] Lifting hydraulic systems are widely used in the fields of construction machinery and agricultural machinery, such as the lifting systems of excavators, loaders, and harvesters. The lifting hydraulic system in a harvester can include the lifting of the cutter bar, the lifting of the reel, and the hydraulic control system for lifting the grain tank. At present, the industry generally uses the cooperation form of a directional control valve and a hydraulic lock to control the extension and retraction of the hydraulic cylinder. However, if the unloading hydraulic cylinder is not properly controlled, it will cause problems such as weak lifting force, inability to unload grain, or jitter and jerks of the grain tank. Therefore, the stability of the hydraulic control system for lifting the grain tank during operation is an important parameter for judging the performance of harvesting machinery.

[0003] After the vehicle starts, in the existing hydraulic control system for lifting the grain tank, by adjusting the electric control operating handle, the solenoid valve of the working valve is energized. After being energized, it pushes the corresponding spool to move, making the oil circuit in a connected state. The hydraulic oil enters the rodless cavity of the unloading hydraulic cylinder, and the lifting height of the grain tank is determined by controlling the stroke of the hydraulic cylinder. After unloading the grain, adjust the electric control operating handle to energize the solenoid valve of the working valve. After the oil circuit is connected, the hydraulic oil enters the rod cavity of the unloading hydraulic cylinder, and the grain tank retracts. During the process of the grain tank falling, if the falling speed of the grain tank is too fast and the flow rate of the working pump cannot meet the required flow rate of the rod cavity of the unloading hydraulic cylinder, a vacuum will be generated in the rod cavity, resulting in unstable pressure in the pipeline on the rod side of the hydraulic cylinder. The hydraulic lock of the working valve on the rod cavity side will repeatedly open and close, and the hydraulic oil cannot enter the rod cavity of the unloading hydraulic cylinder in time, causing a vacuum in the rod cavity of the unloading hydraulic cylinder. This process will have the following impacts: First, the repeated opening of the hydraulic lock generates pressure shocks in the hydraulic system, causing vibrations in the hydraulic pipeline and increasing the risk of system leakage, directly affecting the safety and reliability of the hydraulic system. Second, the repeated opening and closing of the hydraulic lock cause the grain tank to shake and jerk during the falling process, resulting in jerks during the falling process, vibrations and noises in the mechanical structural parts, and accelerating the damage of the structural parts. To solve this phenomenon, currently, a throttle orifice is used to limit the falling speed of the grain tank, but this method will increase the total unloading time, reduce efficiency, and delay the production progress.

[0004] Therefore, it is necessary to design a hydraulic control system for lifting a grain tank to solve the above problems. Summary of the Utility Model

[0005] In view of this, to overcome the defects of the prior art, the present utility model provides a hydraulic control system for lifting a grain tank, effectively solving a series of problems caused by the fact that the flow rate of the working pump cannot meet the required flow rate of the rod cavity of the unloading hydraulic cylinder, resulting in a vacuum in the rod cavity.

[0006] According to a first aspect of the present utility model, a hydraulic control system for lifting a grain box is provided. The hydraulic control system for lifting the grain box includes an oil tank, a driving and adjusting module, and a grain unloading module. The grain unloading module is connected to the oil tank through the driving and adjusting module. The grain unloading module includes an oil cylinder unit and a supplementary oil unit. The supplementary oil unit communicates with the rodless cavity and the rod cavity of the oil cylinder unit so that the hydraulic oil in the rodless cavity can flow to the rod cavity.

[0007] Preferably, the supplementary oil unit includes a first branch, a switching valve, and a check valve. The two ends of the first branch communicate with the rodless cavity and the rod cavity. The switching valve and the check valve are sequentially arranged on the first branch so that the hydraulic oil can flow from the rodless cavity to the rod cavity.

[0008] Preferably, the oil cylinder unit includes two grain unloading oil cylinders. The first end of the first branch is connected to the rodless cavities of the two grain unloading oil cylinders, and the second end of the first branch is connected to the rod cavities of the two grain unloading oil cylinders.

[0009] Preferably, the hydraulic control system for lifting the grain box further includes a second branch and a third branch. The first end of the second branch is connected to the oil tank, and the second end of the second branch is connected to the rodless cavity of the grain unloading module. The first end of the third branch is connected to the oil tank, and the second end of the third branch is connected to the rod cavity of the grain unloading module.

[0010] Preferably, the driving and adjusting module includes a solenoid valve, and the solenoid valve is arranged on the second branch and the third branch.

[0011] Preferably, the second branch includes a first sub-branch and a second sub-branch, and the third branch includes a third sub-branch and a fourth sub-branch. The two ends of the first sub-branch and the two ends of the fourth sub-branch are respectively connected to the oil tank and the solenoid valve. The two ends of the second sub-branch are respectively connected to the solenoid valve and the rodless cavity of the grain unloading module. The two ends of the third sub-branch are respectively connected to the solenoid valve and the rod cavity of the grain unloading module.

[0012] Preferably, the solenoid valve includes a cut-off position, a communication position, and a cross position. The hydraulic control system for lifting the grain box can switch between a stop state, a grain box lifting state, and a grain box retracting state.

[0013] Preferably, when the grain box lifting hydraulic control system is in a stopped state, the solenoid valve is in the cut-off position, the first branch is disconnected, and the second branch and the third branch are communicated with the fourth branch; when the grain box lifting hydraulic control system is in a grain box lifting state, the solenoid valve is in the communication position, the switching valve is closed, the first branch is communicated with the second branch, the third branch is communicated with the fourth branch, and the rod chamber of the oil cylinder unit extends; when the grain box lifting hydraulic control system is in a grain box retracting state, the solenoid valve is in the cross position, the switching valve is opened, the first branch is communicated with the third branch, the second branch is communicated with the fourth branch, and the rod chamber of the oil cylinder unit retracts.

[0014] Preferably, both the second branch and the third branch are provided with pilot-operated check valves.

[0015] Preferably, the drive adjustment module further includes a drive pump, and the drive pump is arranged on the second branch and between the fuel tank and the solenoid valve.

[0016] According to the grain box lifting hydraulic control system of the present invention, through the cooperation of the fuel tank, the drive adjustment module and the grain unloading module, during the falling process of the grain box, the oil in the rodless chamber of the grain unloading oil cylinder can be supplemented into the rod chamber, avoiding the rod chamber from being sucked empty, enhancing the stability of the hydraulic system, solving the jerky jitter phenomenon during the falling process of the grain box, reducing the vibration and noise of the vehicle, and reducing the risk of damage to the structural parts near the grain box; it can also effectively solve the problem of repeated opening and closing of the working valve hydraulic lock, avoid pressure shock in the pipeline behind the valve, reduce the risk of hydraulic system leakage, and enhance the stability and reliability of the hydraulic system.

[0017] To make the above objects, features and advantages of the present application more obvious and understandable, the following specific preferred embodiments are given in conjunction with the accompanying drawings and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0019] Figure 1 FIG. shows a schematic structural diagram of a grain box lifting hydraulic control system according to an embodiment of the present invention.

[0020] Reference numerals: 1 - fuel tank; 2 - rodless chamber; 3 - rod chamber; 4 - first branch; 5 - switching valve; 6 - check valve; 7 - solenoid valve; 701 - cut-off position; 702 - communication position; 703 - crossover position; 8 - first shunt; 9 - second shunt; 10 - third shunt; 11 - fourth shunt; 12 - pilot-operated check valve; 13 - driving pump. Detailed implementation manners

[0021] The following detailed implementation manners are provided to help readers obtain a comprehensive understanding of the methods, devices, and / or systems described herein. However, after understanding the disclosure of this application, various changes, modifications, and equivalents of the methods, devices, and / or systems described herein will be obvious. For example, the order of operations described herein is merely an example and is not limited to the order set forth herein. Rather, changes that will be obvious after understanding the disclosure of this application may be made, except for operations that must occur in a specific order. In addition, descriptions of features known in the art may be omitted for the sake of clarity and conciseness.

[0022] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, devices, and / or systems described herein that will be obvious after understanding the disclosure of this application.

[0023] Throughout the specification, when an element (such as a layer, region, or substrate) is described as "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "above" another element, or "covering" another element, or there may be one or more other elements therebetween. In contrast, when an element is described as "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly above" another element, or "directly covering" another element, there may be no other elements therebetween.

[0024] As used herein, the term "and / or" includes any one of the listed related items and any combination of any two or more of them.

[0025] Although terms such as "first", "second", and "third" may be used herein to describe various components, elements, regions, layers, or sections, these components, elements, regions, layers, or sections are not limited by these terms. Rather, these terms are only used to distinguish one component, element, region, layer, or section from another. Thus, a first component, element, region, layer, or section referred to in the examples described herein may also be termed a second component, element, region, layer, or section without departing from the teachings of the examples.

[0026] For ease of description, spatial relationship terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another as shown in the figures. Such spatial relationship terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as "above" or "upper" relative to another element will then be "below" or "lower" relative to the other element. Thus, the term "above" includes both the orientation of "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relationship terms used herein will be interpreted accordingly.

[0027] The terms used herein are for the purpose of describing various examples only and are not intended to limit the examples. Unless the context clearly dictates otherwise, the singular forms are also intended to include the plural forms. The terms "comprises", "comprising", and "having" list the stated features, quantities, operations, components, elements, and / or combinations thereof that exist, but do not preclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0028] Due to manufacturing techniques and / or tolerances, variations in the shapes shown in the figures may occur. Thus, the examples described herein are not limited to the specific shapes shown in the figures, but include changes in shape that occur during manufacturing.

[0029] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0030] According to a grain box lifting hydraulic control system provided by the present utility model, as Figure 1 shown, the grain box lifting hydraulic control system is used for lifting and retracting a grain box, and the grain box lifting hydraulic control system includes an oil tank 1, a driving and adjusting module, and a grain unloading module.

[0031] In the following description, reference will be made to Figure 1 specifically describe the detailed structures of the oil tank 1, the drive adjustment module, and the grain unloading module of the grain tank lifting hydraulic control system.

[0032] As Figure 1 shown, in the embodiment, the grain tank lifting hydraulic control system includes an oil tank 1, a drive adjustment module, and a grain unloading module. The grain unloading module is connected to the oil tank 1 through the drive adjustment module. The grain unloading module includes an oil cylinder unit and a supplementary oil unit. The supplementary oil unit communicates with the rodless cavity 2 and the rod cavity 3 of the oil cylinder unit, so that the hydraulic oil in the rodless cavity 2 can flow to the rod cavity 3. The grain tank lifting hydraulic control system additionally adds a supplementary oil unit, so that the hydraulic oil can be supplemented from the rodless cavity 2 into the rod cavity 3. Due to the limited displacement of the working gear pump and the existence of flow and pressure pulsations, when the grain tank is retracted, the grain tank falls too fast due to its own weight, and the hydraulic oil in the high-pressure oil circuit cannot be supplemented to the rod cavity 3 in time. At this time, using the supplementary oil unit, the hydraulic oil in the rodless cavity 2 can be supplemented to the rod cavity 3 in time, avoiding the repeated opening of the hydraulic lock in the rod cavity 3 due to air suction.

[0033] The grain tank lifting hydraulic control system can, during the falling process of the grain tank, make the oil in the rodless cavity 2 supplement into the rod cavity 3, avoid air suction in the rod cavity 3, enhance the stability of the hydraulic system, solve the phenomenon of jerks and vibrations during the falling process of the grain tank, reduce the vibration and noise of the vehicle, and reduce the risk of damage to the structural components near the grain tank; it can also effectively solve the problem of repeated opening and closing of the hydraulic lock of the working valve, avoid pressure shocks in the pipeline behind the valve, reduce the risk of hydraulic system leakage, and enhance the stability and reliability of the hydraulic system.

[0034] Preferably, as Figure 1 shown, in the embodiment, the supplementary oil unit may include a first branch 4, a switching valve 5, and a check valve 6. Both ends of the first branch 4 communicate with the rodless cavity 2 and the rod cavity 3, so that the hydraulic oil can flow from the rodless cavity 2 to the rod cavity 3. The switching valve 5 and the check valve 6 are sequentially arranged on the first branch 4. The switching valve 5 is used to control the on-off of the first branch 4, and the check valve 6 is provided to prevent the hydraulic oil from flowing from the rod cavity 3 to the rodless cavity 2.

[0035] Preferably, as Figure 1 shown, in the embodiment, the oil cylinder unit may include two grain unloading oil cylinders. Each grain unloading oil cylinder may include a rodless cavity 2 and a rod cavity 3 connected to each other. The first end of the first branch 4 is connected to the rodless cavities 2 of the two grain unloading oil cylinders, and the second end of the first branch 4 is connected to the rod cavities 3 of the two grain unloading oil cylinders. The first branch 4 can simultaneously make the hydraulic oil in the rodless cavities 2 of the two grain unloading oil cylinders flow to the rod cavities 3.

[0036] Preferably, as Figure 1As shown, in the embodiment, the hydraulic control system for lifting the grain bin further includes a second branch and a third branch. The first end of the second branch is connected to the oil tank 1, and the second end of the second branch is connected to the rodless cavity 2 of the grain unloading module. The first end of the third branch is connected to the oil tank 1, and the second end of the third branch is connected to the rod cavity 3 of the grain unloading module. The second branch and the third branch are used for the passage of hydraulic oil. The second branch and the third branch cooperate with the drive adjustment module to change the flow direction of the hydraulic oil, control the extension and retraction of the grain unloading cylinder, and thus realize the lifting and retraction of the grain bin.

[0037] Preferably, as Figure 1 shown, in the embodiment, the drive adjustment module may include a solenoid valve 7, and the solenoid valve 7 is arranged on the second branch and the third branch. The solenoid valve 7 can be used to control the on-off of the second branch and the third branch, and thus control the flow direction of the hydraulic oil.

[0038] Preferably, as Figure 1 shown, in the embodiment, the second branch may include a first sub-branch 8 and a second sub-branch 9, and the third branch includes a third sub-branch 10 and a fourth sub-branch 11. Both ends of the first sub-branch 8 and both ends of the fourth sub-branch 11 are respectively connected to the oil tank 1 and the solenoid valve 7. Both ends of the second sub-branch 9 are respectively connected to the solenoid valve 7 and the rodless cavity 2 of the grain unloading module. Both ends of the third sub-branch 10 are respectively connected to the solenoid valve 7 and the rod cavity 3 of the grain unloading module. The first sub-branch 8, the second sub-branch 9, the third sub-branch 10 and the fourth sub-branch 11 change their connection modes with each other through the solenoid valve 7 to realize the change of the flow direction of the hydraulic oil.

[0039] Preferably, as Figure 1 shown, in the embodiment, the solenoid valve 7 includes a cut-off position 701, a connection position 702 and a cross position 703. When the solenoid valve 7 is in different positions, the hydraulic control system for lifting the grain bin can be switched between a stop state, a grain bin lifting state and a grain bin retracting state.

[0040] Preferably, as Figure 1 shown, in the embodiment, when the hydraulic control system for lifting the grain bin is in the stop state, the solenoid valve 7 is located at the cut-off position 701, the first sub-branch 8 is disconnected, and the second sub-branch 9 and the third sub-branch 10 are connected to the fourth sub-branch 11; when the hydraulic control system for lifting the grain bin is in the grain bin lifting state, the solenoid valve 7 is located at the connection position 702, the switching valve 5 is closed, the first sub-branch 8 is connected to the second sub-branch 9, the third sub-branch 10 is connected to the fourth sub-branch 11, and the rod cavity 3 of the cylinder unit extends, so that the grain bin is lifted; when the hydraulic control system for lifting the grain bin is in the grain bin retracting state, the solenoid valve 7 is located at the cross position 703, the switching valve 5 is opened, the first sub-branch 8 is connected to the third sub-branch 10, the second sub-branch 9 is connected to the fourth sub-branch 11, and the rod cavity 3 of the cylinder unit retracts, so that the grain bin is retracted.

[0041] Preferably, as Figure 1 shown, in the embodiment, the second shunt 9 and the third shunt 10 are both provided with a pilot-operated check valve 12.

[0042] Preferably, as Figure 1 shown, in the embodiment, the drive adjustment module may further include a drive pump 13. The drive pump 13 is arranged on the second branch, and the drive pump 13 is arranged between the fuel tank 1 and the solenoid valve 7.

[0043] The usage process of the grain box lifting hydraulic control system is as follows: When the grain box lifting hydraulic control system is switched from the stopped state to the lifting state, the solenoid valve 7 is energized, so that the solenoid valve 7 is in the connected position 702, the switching valve 5 is closed, the first branch 4 is closed, and the high-pressure oil circuit is connected to the rodless cavity 2 of the unloading oil cylinder, and the grain box rises. After the unloading of grain is completed and the grain box needs to be retracted, the solenoid valve 7 and the switching valve 5 are energized, so that the solenoid valve 7 is in the cross position 703, the high-pressure oil circuit is connected to the rod cavity 3 of the unloading oil cylinder, the switching valve 5 is opened, the first branch 4 is opened, and the hydraulic oil can flow from the rodless cavity 2 to the rod cavity 3. Due to the limited displacement of the working gear pump and the existence of flow and pressure pulsations, the grain box falls too fast due to its own weight, and the hydraulic oil in the high-pressure oil circuit cannot be replenished to the rod cavity 3 in time. At this time, the branch where the switching valve 5 is located is connected, and the hydraulic oil flowing out of the rodless cavity 2 is replenished to the rod cavity 3 in time, avoiding the suction of the rod cavity 3 and the repeated opening of the hydraulic lock.

[0044] Through the cooperation of the fuel tank, the drive adjustment module and the unloading module, the grain box lifting hydraulic control system can, during the falling process of the grain box, replenish the oil in the rodless cavity of the unloading oil cylinder into the rod cavity, avoid the suction of the rod cavity, enhance the stability of the hydraulic system, solve the phenomenon of jerks and vibrations during the falling process of the grain box, reduce the vibration and noise of the vehicle, and reduce the risk of damage to the structural components near the grain box; it can also effectively solve the problem of repeated opening and closing of the working valve hydraulic lock, avoid pressure shocks in the pipeline behind the valve, reduce the risk of hydraulic system leakage, and enhance the stability and reliability of the hydraulic system.

[0045] Finally, it should be noted that: The above-mentioned embodiments are only specific implementation manners of the present application, used to illustrate the technical solutions of the present application, rather than limiting it. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: Any person skilled in the art within the technical scope disclosed by the present application can still modify the technical solutions recorded in the foregoing embodiments, or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A grain tank lifting hydraulic control system, characterized in that: The grain tank lifting hydraulic control system includes an oil tank, a drive adjustment module and a grain unloading module. The grain unloading module is connected to the oil tank through the drive adjustment module. The grain unloading module includes a cylinder unit and an oil replenishing unit. The oil replenishing unit connects the rodless chamber and the rod chamber of the cylinder unit so that the hydraulic oil in the rodless chamber can flow to the rod chamber.

2. The grain tank lifting hydraulic control system according to claim 1, characterized in that: The oil replenishing unit includes a first branch, a switch valve and a one-way valve. The two ends of the first branch are connected to the rodless chamber and the rod chamber. The switch valve and the one-way valve are arranged in the first branch in sequence to enable the hydraulic oil to flow from the rodless chamber to the rod chamber.

3. The grain tank lifting hydraulic control system according to claim 2, characterized in that: The oil cylinder unit includes two grain unloading oil cylinders, the first end of the first branch is connected to the rodless cavities of the two grain unloading oil cylinders, and the second end of the first branch is connected to the rod cavities of the two grain unloading oil cylinders.

4. The grain tank lifting hydraulic control system according to claim 2, characterized in that: The grain tank lifting hydraulic control system also includes a second branch and a third branch, the first end of the second branch is connected to the oil tank, the second end of the second branch is connected to the rodless chamber of the grain unloading module, the first end of the third branch is connected to the oil tank, and the second end of the third branch is connected to the rod chamber of the grain unloading module.

5. The grain tank lifting hydraulic control system according to claim 4, characterized in that: The drive adjustment module includes a solenoid valve, and the solenoid valve is arranged on the second branch and the third branch.

6. The grain tank lifting hydraulic control system according to claim 5, characterized in that: The second branch includes a first branch and a second branch, and the third branch includes a third branch and a fourth branch. Both ends of the first branch and both ends of the fourth branch are respectively connected to the oil tank and the solenoid valve, both ends of the second branch are respectively connected to the solenoid valve and the rodless chamber of the grain unloading module, and both ends of the third branch are respectively connected to the solenoid valve and the rod chamber of the grain unloading module.

7. The grain tank lifting hydraulic control system according to claim 6, characterized in that: The solenoid valve comprises a cut-off position, a connecting position and a cross position, and the grain tank lifting hydraulic control system can switch between a stop state, a grain tank lifting state and a grain tank retracting state.

8. The grain tank lifting hydraulic control system according to claim 7, characterized in that: When the grain tank lifting hydraulic control system is in a stopped state, the solenoid valve is in the cut-off position, the first branch is disconnected, and the second branch and the third branch are connected to the fourth branch; When the grain tank lifting hydraulic control system is in a grain tank lifting state, the solenoid valve is in the connecting position, the switch valve is closed, the first branch is connected with the second branch, the third branch is connected with the fourth branch, and the rod chamber of the oil cylinder unit extends; When the grain tank lifting hydraulic control system is in the grain tank retracted state, the solenoid valve is located in the cross position, the switch valve is opened, the first branch is connected to the third branch, the second branch is connected to the fourth branch, and the rod chamber of the cylinder unit is retracted.

9. The grain tank lifting hydraulic control system according to claim 6, characterized in that: The second branch and the third branch are both provided with a hydraulically controlled one-way valve.

10. The grain tank lifting hydraulic control system according to claim 5, characterized in that: The drive adjustment module further includes a drive pump, which is disposed in the second branch and between the oil tank and the solenoid valve.

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