Upper cover opening device of moisture regaining machine

Abstract

The utility model provides a damping machine upper cover opening device and belongs to the technical field of damping machines, the damping machine upper cover opening device comprises a hydraulic station, a liquid inlet system, a hydraulic cylinder and a pressure maintaining system, the hydraulic cylinder is arranged below a damping machine upper cover, and hydraulic oil in the hydraulic station is conveyed through the liquid inlet system to provide power for the hydraulic cylinder; the hydraulic cylinder extends to jack up the upper cover, so that the upper cover of the damping machine can be automatically opened, and the labor intensity of workers is reduced; the pressure maintaining system is arranged on the liquid inlet system, and the pressure maintaining system is connected with the hydraulic cylinder in parallel, so that the pressure of hydraulic oil conveyed to the hydraulic cylinder by the liquid inlet system is adjusted, the pressure of the liquid inlet system is adjustable, the hydraulic station can enter a pressure maintaining state after a piston rod of the hydraulic cylinder extends out, and then the upper cover is continuously kept in an open state; suddenly closing of the upper cover due to pressure relief of the liquid inlet system is prevented, and potential safety hazards are reduced.

Description

Technical Field

[0001] This application belongs to the technical field of conditioning machines, and particularly relates to an opening device for the upper cover of a conditioning machine. Background Art

[0002] During the use of a tunnel-type conditioning machine, it is necessary to regularly open the upper cover for cleaning and maintenance of the water-using equipment. At present, the opening methods for the upper cover of tunnel-type conditioning machines in the tobacco industry are generally manual gas spring opening or motor-driven opening. For manual gas spring opening, the requirement for manpower is relatively high in actual operation, and the labor intensity of the operator is relatively large; for motor-driven opening, although it can save manpower, there are certain risks during cleaning and maintenance, and the safety performance is relatively poor. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0004] In view of this, according to an embodiment of the present application, an opening device for the upper cover of a conditioning machine is proposed, including:

[0005] A hydraulic station for storing hydraulic oil;

[0006] A liquid inlet system, the input end of which is connected to the hydraulic station;

[0007] A hydraulic cylinder disposed below the upper cover, and the hydraulic cylinder is connected to the output end of the liquid inlet system to lift the upper cover by the elongation of the hydraulic cylinder;

[0008] A pressure maintaining system disposed on the liquid inlet system and in parallel with the hydraulic cylinder.

[0009] In a feasible embodiment, the upper cover includes a hinge seat and a cover plate, and the cover plate is connected to the hinge seat through a connecting portion; the hydraulic cylinder is vertically disposed below the connecting portion, and the hydraulic cylinder is located at one end of the connecting portion close to the cover plate.

[0010] In a feasible embodiment, the liquid inlet system includes a liquid inlet pipeline, and a check valve and a one-way throttle valve are disposed on the liquid inlet pipeline. The check valve is located at one end of the liquid inlet pipeline close to the hydraulic station, and the check valve is used to prevent the hydraulic oil from flowing back to the hydraulic station from the liquid inlet pipeline; the one-way throttle valve is disposed at one end of the liquid inlet pipeline close to the hydraulic cylinder, and the one-way throttle valve is used to control the flow rate of the hydraulic oil entering the hydraulic cylinder.

[0011] In a feasible embodiment, the liquid inlet system further includes a filter disposed on the liquid inlet pipeline between the check valve and the hydraulic station.

[0012] In a feasible embodiment, the pressure maintaining system includes:

[0013] The overflow pipe group is arranged on the liquid inlet pipeline between the one-way valve and the hydraulic station, and the overflow pipe group is connected to the hydraulic station;

[0014] The monitoring and regulating pipe group is arranged on the liquid inlet pipeline between the one-way valve and the one-way throttle valve. The monitoring and regulating pipe group is used to monitor the pressure of the hydraulic oil in the liquid inlet pipeline. The overflow pipe group is connected in parallel with the monitoring and regulating pipe group, and the monitoring and regulating pipe group adjusts the pressure of the hydraulic oil in the liquid inlet pipeline by controlling the overflow pipe group.

[0015] In a feasible implementation manner, the overflow pipe group includes an overflow pipeline, on which an overflow solenoid valve and an overflow valve are arranged, and the overflow solenoid valve and the overflow valve are connected in parallel on the overflow pipeline;

[0016] The monitoring and regulating pipe group includes a monitoring pipeline, on which a pressure relay, an accumulator and a pressure gauge are arranged; the pressure relay and the overflow solenoid valve are electrically connected through a control system, so as to close the overflow solenoid valve through the control system when the pressure relay reaches a preset pressure value; the accumulator cooperates with the one-way valve to adjust the pressure of the hydraulic oil in the liquid inlet pipeline.

[0017] In a feasible implementation manner, the pressure maintaining system further includes:

[0018] The return pipe group is arranged on the liquid inlet pipeline between the one-way valve and the one-way throttle valve, and the return pipe group is connected to the hydraulic station; the return pipe group is connected in parallel with the overflow pipe group.

[0019] In a feasible implementation manner, the return pipe group includes a return pipeline, which is arranged on the liquid inlet pipeline between the one-way throttle valve and the one-way valve, and an electromagnetic valve is arranged on the return pipeline.

[0020] In a feasible implementation manner, the hydraulic station includes:

[0021] An oil tank for storing hydraulic oil;

[0022] An oil pump, which is arranged on the liquid inlet pipeline between the oil tank and the one-way valve; an oil pump motor is arranged on the oil pump, and the oil pump motor is used to drive the oil pump.

[0023] In a feasible implementation manner, the upper cover opening device of the rehumidifier further includes:

[0024] An air filter, which is arranged on the oil tank.

[0025] Compared with the prior art, the beneficial effects of an upper cover opening device of a rehumidifier in this application are:

[0026] The upper cover opening device provided by the embodiment of the present application includes a hydraulic station, a liquid inlet system, a hydraulic cylinder, and a pressure maintaining system. The hydraulic cylinder is arranged below the upper cover of the tobacco conditioning machine. The hydraulic oil in the hydraulic station is transported through the liquid inlet system to provide power for the hydraulic cylinder, so that the hydraulic cylinder extends to lift the upper cover, enabling the upper cover of the tobacco conditioning machine to be automatically opened, reducing the manual labor intensity. By setting a pressure maintaining system on the liquid inlet system and making the pressure maintaining system parallel to the hydraulic cylinder, the pressure of the hydraulic oil transported by the liquid inlet system to the hydraulic cylinder is adjusted, so that the pressure of the liquid inlet system is adjustable. After the piston rod of the hydraulic cylinder extends, the hydraulic station can enter the pressure maintaining state, thereby enabling the upper cover to remain in the open state continuously and preventing the upper cover from suddenly closing due to pressure relief of the liquid inlet system, which is beneficial to reducing potential safety hazards. Description of the Drawings

[0027] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0028] Figure 1 It is a schematic structural diagram of an upper cover opening device of a tobacco conditioning machine provided by an embodiment of the present application;

[0029] Among them, Figure 1 The corresponding relationship between the reference numerals in and the component names is:

[0030] 11. Hydraulic station; 12. Liquid inlet system; 13. Hydraulic cylinder; 14. Pressure maintaining system; 15. Upper cover; 16. Air filter;

[0031] 111. Oil tank; 112. Oil pump; 113. Oil pump motor;

[0032] 121. Liquid inlet pipeline; 122. Check valve; 123. One-way throttle valve; 124. Filter;

[0033] 141. Overflow pipe group; 142. Monitoring and regulating pipe group; 143. Return pipe group;

[0034] 151. Hinge seat; 152. Cover plate; 153. Connection part;

[0035] 1411. Overflow pipeline; 1412. Overflow solenoid valve; 1413. Overflow valve;

[0036] 1421. Monitoring pipeline; 1422. Pressure relay; 1423. Accumulator; 1424. Pressure gauge;

[0037] 1431. Return pipeline; 1432. Solenoid valve. Detailed Embodiments

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 should not be construed as a limitation to the present application.

[0039] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0040] In the present application, unless otherwise clearly specified and defined, the terms "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0041] The preferred embodiments of the present application will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present application, and are not used to limit the present application.

[0042] As Figure 1 shown, according to an embodiment of the present application, a device for opening the upper cover of a rehumidifier is provided, including: a hydraulic station 11, a liquid inlet system 12, a hydraulic cylinder 13, and a pressure maintaining system 14; the hydraulic station 11 is used for storing hydraulic oil; the input end of the liquid inlet system 12 is connected to the hydraulic station 11; the hydraulic cylinder 13 is arranged below the upper cover 15, and the hydraulic cylinder 13 is connected to the output end of the liquid inlet system 12 to lift the upper cover 15 by the elongation of the hydraulic cylinder 13; the pressure maintaining system 14 is arranged on the liquid inlet system 12, and the pressure maintaining system 14 is connected in parallel with the hydraulic cylinder 13.

[0043] The upper cover opening device provided by the embodiment of the present application includes a hydraulic station 11, a liquid inlet system 12, a hydraulic cylinder 13 and a pressure maintaining system 14. The hydraulic cylinder 13 is arranged below the upper cover 15 of the conditioning machine. The hydraulic oil in the hydraulic station 11 is conveyed through the liquid inlet system 12 to provide power for the hydraulic cylinder 13, so that the hydraulic cylinder 13 extends to jack up the upper cover 15, enabling the upper cover 15 of the conditioning machine to be automatically opened, reducing the manual labor intensity. By arranging the pressure maintaining system 14 on the liquid inlet system 12 and making the pressure maintaining system 14 in parallel with the hydraulic cylinder 13, the pressure of the hydraulic oil conveyed by the liquid inlet system 12 to the hydraulic cylinder 13 is adjusted, so that the pressure of the liquid inlet system 12 is adjustable. After the piston rod of the hydraulic cylinder 13 extends, the hydraulic station 11 can enter the pressure maintaining state, and then the upper cover 15 can be continuously kept in the open state, preventing the upper cover 15 from suddenly closing due to the pressure relief of the liquid inlet system 12, which is beneficial to reducing potential safety hazards.

[0044] Further, the upper cover 15 opening device is electrically connected to the control system of the conditioning machine. The operator starts the hydraulic station 11 by clicking the opening button on the HMI interface. The hydraulic station 11 pumps the hydraulic oil into the hydraulic cylinder 13 through the liquid inlet system 12, and then the hydraulic cylinder 13 jacks up the upper cover 15 of the tunnel type conditioning machine. When it is necessary to close the upper cover 15 of the tunnel type conditioning machine, by the operator clicking the closing button on the HMI interface, the hydraulic station 11 slowly retracts the hydraulic oil in the liquid inlet system 12, and the upper cover 15 slowly closes. By operating the local switch or the electronic button on the operation screen, the opening and closing of the upper cover 15 are automatically completed by the control program.

[0045] It can be understood that after the piston rod of the hydraulic cylinder 13 extends to the preset length, that is, after the upper cover 15 is turned by a predetermined angle, the pressure maintaining system 14 adjusts the liquid inlet system 12 so that the pressure in the liquid inlet system 12 can be maintained stable, thereby keeping the opening angle of the upper cover 15 almost unchanged.

[0046] As Figure 1 shown, in a feasible embodiment, the upper cover 15 includes a hinge seat 151 and a cover plate 152. The cover plate 152 is connected to the hinge seat 151 through a connecting portion 153. The hydraulic cylinder 13 is vertically arranged below the connecting portion 153, and the hydraulic cylinder 13 is located at one end of the connecting portion 153 close to the cover plate 152.

[0047] In this technical solution, the piston rod of the hydraulic cylinder 13 is arranged on the connecting portion 153 outside the cover plate 152, and the hydraulic cylinder 13 is close to the cover plate 152, so as to reduce the resistance arm when the hydraulic cylinder 13 jacks up the upper cover 15, and jack up the upper cover 15 with a smaller hydraulic oil pressure, which is beneficial to reducing the use cost of the device.

[0048] In some examples, a receiving groove is provided on the bottom surface of the connecting portion 153, and the end of the piston rod of the hydraulic cylinder 13 is embedded in the receiving groove, and the end of the piston rod moves in the receiving groove to improve the stability and reliability of the contact between the piston rod and the cover plate 152.

[0049] As Figure 1 shown, in a feasible implementation, the liquid inlet system 12 includes a liquid inlet pipeline 121, and a one-way valve 122 and a one-way throttle valve 123 are provided on the liquid inlet pipeline 121. The one-way valve 122 is located at one end of the liquid inlet pipeline 121 close to the hydraulic station 11, and the one-way valve 122 is used to control the hydraulic oil not to flow back from the liquid inlet pipeline 121 to the hydraulic station 11; the one-way throttle valve 123 is provided at one end of the liquid inlet pipeline 121 close to the hydraulic cylinder 13, and the one-way throttle valve 123 is used to control the flow rate of the hydraulic oil entering the hydraulic cylinder 13.

[0050] In this technical solution, the liquid inlet system 12 includes a liquid inlet pipeline 121 and a one-way valve 122 and a one-way throttle valve 123 provided on the liquid inlet pipeline 121. By providing a one-way valve 122 at one end of the liquid inlet pipeline 121 close to the hydraulic station 11, it is possible to prevent the hydraulic oil from flowing back from the liquid inlet pipeline 121 to the hydraulic station 11 and interfering with the adjustment effect of the pressure maintaining system 14 on the liquid inlet system 12; by providing a one-way throttle valve 123 at one end of the liquid inlet pipeline 121 close to the hydraulic cylinder 13, the speed of supplying oil from the liquid inlet pipeline 121 to the hydraulic cylinder 13 can be controlled, so that the speed of the hydraulic cylinder 13 extending and retracting is controllable, and thus the speed of opening and closing the upper cover 15 is controllable, ensuring the safety of the tobacco moisture conditioner equipment.

[0051] As Figure 1 shown, in a feasible implementation, the liquid inlet system 12 further includes a filter 124, and the filter 124 is provided on the liquid inlet pipeline 121 between the one-way valve 122 and the hydraulic station 11.

[0052] In this technical solution, the hydraulic oil in the hydraulic station 11 passes through the filter 124 before passing through the one-way valve 122 to remove impurities in the hydraulic oil, protect the upper cover 15 opening device from being worn and blocked, and is beneficial to extending the service life of the upper cover 15 opening device.

[0053] As Figure 1As shown, in a feasible implementation, the pressure-holding system 14 includes an overflow pipe group 141 and a monitoring and regulating pipe group 142; the overflow pipe group 141 is arranged on the liquid inlet pipeline 121 between the one-way valve 122 and the hydraulic station 11, and the overflow pipe group 141 is connected to the hydraulic station 11; the monitoring and regulating pipe group 142 is arranged on the liquid inlet pipeline 121 between the one-way valve 122 and the one-way throttle valve 123, and the monitoring and regulating pipe group 142 is used to monitor the pressure of the hydraulic oil in the liquid inlet pipeline 121. The overflow pipe group 141 and the monitoring and regulating pipe group 142 are in parallel, and the monitoring and regulating pipe group 142 adjusts the pressure of the hydraulic oil in the liquid inlet pipeline 121 by controlling the overflow pipe group 141.

[0054] In this technical solution, the overflow pipe group 141, the monitoring and regulating pipe group 142, the one-way valve 122 and the hydraulic cylinder 13 on the liquid inlet pipeline 121 are in parallel with each other. The monitoring and regulating pipe group 142 monitors the oil inlet pressure of the hydraulic cylinder 13, and then controls the overflow pipe group 141 according to the oil inlet pressure of the hydraulic cylinder 13, so that the overflow pipe group 141 is connected to the hydraulic station 11. Furthermore, the excess hydraulic oil in the liquid inlet pipeline 121 flows back to the hydraulic station 11 through the overflow pipe group 141, so that the oil inlet pressure of the hydraulic cylinder 13 is kept relatively stable, realizing the pressure-holding function of the upper cover 15 opening device, enabling the upper cover 15 to continuously maintain the open state according to the use requirements, and improving the safety after the upper cover 15 is opened.

[0055] Furthermore, both the overflow pipe group 141 and the monitoring and regulating pipe group 142 are electrically connected to the automatic control system. When the monitoring and regulating pipe group 142 detects that the pressure of the liquid inlet system 12 exceeds the set value, the overflow pipe group 141 automatically overflows to ensure the safety of the upper cover 15 opening device.

[0056] As Figure 1 shown, in a feasible implementation, the overflow pipe group 141 includes an overflow pipeline 1411, on which an overflow solenoid valve 1412 and an overflow valve 1413 are arranged. The overflow solenoid valve 1412 and the overflow valve 1413 are in parallel on the overflow pipeline 1411; the monitoring and regulating pipe group 142 includes a monitoring pipeline 1421, on which a pressure relay 1422, an accumulator 1423 and a pressure gauge 1424 are arranged; the pressure relay 1422 and the overflow solenoid valve 1412 are electrically connected through the control system, so as to close the overflow solenoid valve 1412 through the control system when the pressure relay 1422 reaches the preset pressure value; the accumulator 1423 cooperates with the one-way valve 122 to adjust the pressure of the hydraulic oil in the liquid inlet pipeline 121.

[0057] In this technical solution, an accumulator 1423, a pressure relay 1422, and a pressure gauge 1424 are arranged on a monitoring pipeline 1421. The pressure gauge 1424 can monitor the pressure of the liquid inlet system 12 in real time; the pressure relay 1422 can sense the pressure of the liquid inlet system 12 and trigger the control system to close the overflow solenoid valve 1412 when the pressure of the liquid inlet system 12 reaches a preset pressure value; the accumulator 1423 can absorb the pressure fluctuations of the liquid inlet system 12 or provide additional flow during the peak demand of the liquid inlet system 12, ensuring that the liquid inlet system 12 operates within a safe working pressure range.

[0058] In this technical solution, the pressure relay 1422 is electrically connected to the control system of the conditioning machine, and the overflow solenoid valve 1412 is electrically connected to the control system of the conditioning machine. A pressure value is preset for the pressure relay 1422. When the pressure relay 1422 senses that the pressure in the liquid inlet pipeline 121 reaches the preset pressure value, the pressure relay 1422 transmits a signal to the control system, and the control system transmits a signal to the overflow solenoid valve 1412 to close the overflow solenoid valve 1412; then, through the cooperation of the accumulator 1423 and the one-way valve 122, the oil pressure in the liquid inlet pipeline 121 is adjusted to maintain the preset pressure value, thereby realizing the pressure maintaining function of the liquid inlet system 12, preventing the hydraulic rod from accidentally closing due to the pressure relief of the liquid inlet system 12, and preventing the upper cover 15 from suddenly closing due to the pressure relief of the upper cover 15 opening device, ensuring the safety after the upper cover 15 is opened.

[0059] It can be understood that the one-way valve 122 restricts the flow direction of the hydraulic oil in the liquid inlet pipeline 121, so that the hydraulic oil in the hydraulic station 11 can only flow to the hydraulic cylinder 13 and cannot flow back. The return pipe group 143 and the overflow pipe group 141 are blocked by the one-way valve 122. By arranging the overflow pipe group 141 between the one-way valve 122 and the hydraulic station 11, the hydraulic oil at the rear end of the one-way valve 122 can flow back to the hydraulic station 11 from the overflow pipe group 141, realizing the adjustment of the liquid inlet system 12, preventing the oil pressure in the liquid inlet system 12 from being too high, and ensuring safety.

[0060] As Figure 1 shown, in a feasible implementation manner, the pressure maintaining system 14 further includes: a return pipe group 143; the return pipe group 143 is arranged on the liquid inlet pipeline 121 between the one-way valve 122 and the one-way throttle valve 123, and the return pipe group 143 is connected to the hydraulic station 11; the return pipe group 143 is connected in parallel with the overflow pipe group 141.

[0061] In this technical solution, the return pipe group 143 is connected in parallel with the overflow pipe group 141. When it is necessary to close the upper cover 15, the return pipe group 143 is communicated with the hydraulic station 11, and the hydraulic oil slowly flows back to the hydraulic station 11 from the one-way throttle valve 123 through the return pipe group 143 under the action of the self-weight of the upper cover 15, realizing the slow closing of the upper cover 15. The upper cover 15 closes by relying on its own gravity, saving energy.

[0062] As Figure 1 shown, in a feasible implementation, the return pipe group 143 includes a return pipe 1431, and the return pipe 1431 is disposed on the liquid inlet pipe 121 between the one-way throttle valve 123 and the one-way valve 122. An electromagnetic valve 1432 is provided on the return pipe 1431.

[0063] In this technical solution, when the upper cover 15 is closed, the electromagnetic valve 1432 on the return pipe 1431 is opened to connect the return pipe 1431 with the hydraulic station 11. Under the self-weight of the upper cover 15, the hydraulic oil slowly flows back to the fuel tank 111 through the one-way throttle valve 123, the return pipe 1431 and the electromagnetic valve 1432. Under the self-weight of the upper cover 15, the upper cover 15 can be automatically and slowly closed.

[0064] Furthermore, the one-way throttle valve 123, the one-way valve 122, the filter 124, the overflow valve 1413, the overflow electromagnetic valve 1412 and the electromagnetic valve 1432 are electrically connected to the control system to realize automatic control of the upper cover 15 opening device by operating the control system.

[0065] As Figure 1 shown, in a feasible implementation, the hydraulic station 11 includes: a fuel tank 111 and an oil pump 112; the fuel tank 111 is used for storing hydraulic oil; the oil pump 112 is disposed on the liquid inlet pipe 121 between the fuel tank 111 and the one-way valve 122; an oil pump motor 113 is provided on the oil pump 112, and the oil pump motor 113 is used for driving the oil pump 112.

[0066] In this technical solution, the fuel tank 111 can store hydraulic oil to provide a stable oil source for the hydraulic cylinder 13; the oil pump 112 sucks hydraulic oil from the fuel tank 111 and pressurizes it under the drive of the oil pump motor 113, and then conveys the hydraulic oil to the liquid inlet system 12.

[0067] As Figure 1 shown, in a feasible implementation, the upper cover opening device of the reclaimer further includes: an air filter 16; the air filter 16 is disposed on the fuel tank 111.

[0068] In this technical solution, by providing the air filter 16 on the fuel tank 111, impurities and moisture in the air or hydraulic oil entering the fuel tank 111 are removed, the cleanliness of the hydraulic oil is ensured, and it is beneficial to extend the service life of the upper cover 15 opening device.

[0069] Those skilled in the art can easily understand that, on the premise of no conflict, the above advantageous manners can be freely combined and superimposed.

[0070] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only the preferred implementation manner of the present application. It should be noted that for those of ordinary skill in the art in this technical field, several improvements and variations can be made without departing from the technical principle of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. An upper cover opening device for a conditioning machine, characterized in that The upper cover opening device of the conditioning machine includes: A hydraulic station for storing hydraulic oil; A liquid inlet system, the input end of which is connected to the hydraulic station; A hydraulic cylinder disposed below the upper cover, and the hydraulic cylinder is connected to the output end of the liquid inlet system to lift the upper cover by extending the hydraulic cylinder; A pressure maintaining system disposed on the liquid inlet system and in parallel with the hydraulic cylinder.

2. The upper cover opening device of the conditioning machine according to claim 1, characterized in that The upper cover includes a hinge seat and a cover plate, and the cover plate is connected to the hinge seat through a connecting portion; the hydraulic cylinder is vertically disposed below the connecting portion, and the hydraulic cylinder is located at one end of the connecting portion close to the cover plate.

3. The upper cover opening device of the conditioning machine according to claim 1, characterized in that The liquid inlet system includes a liquid inlet pipeline, and a one-way valve and a one-way throttle valve are disposed on the liquid inlet pipeline. The one-way valve is located at one end of the liquid inlet pipeline close to the hydraulic station, and the one-way valve is used to prevent the hydraulic oil from flowing back to the hydraulic station from the liquid inlet pipeline; the one-way throttle valve is disposed at one end of the liquid inlet pipeline close to the hydraulic cylinder, and the one-way throttle valve is used to control the flow rate of the hydraulic oil entering the hydraulic cylinder.

4. The upper cover opening device of the conditioning machine according to claim 3, characterized in that The liquid inlet system further includes a filter disposed on the liquid inlet pipeline between the one-way valve and the hydraulic station.

5. The upper cover opening device of the conditioning machine according to claim 3, characterized in that The pressure maintaining system includes: An overflow pipe group disposed on the liquid inlet pipeline between the one-way valve and the hydraulic station, and the overflow pipe group is connected to the hydraulic station; A monitoring and regulating pipe group disposed on the liquid inlet pipeline between the one-way valve and the one-way throttle valve, and the monitoring and regulating pipe group is used to monitor the pressure of the hydraulic oil in the liquid inlet pipeline. The overflow pipe group is in parallel with the monitoring and regulating pipe group, and the monitoring and regulating pipe group adjusts the pressure of the hydraulic oil in the liquid inlet pipeline by controlling the overflow pipe group.

6. The upper cover opening device of the conditioning machine according to claim 5, characterized in that The overflow pipe group includes an overflow pipeline, and an overflow solenoid valve and an overflow valve are disposed on the overflow pipeline. The overflow solenoid valve and the overflow valve are in parallel on the overflow pipeline; The monitoring and regulating pipe group includes a monitoring pipeline, and a pressure relay, an accumulator and a pressure gauge are disposed on the monitoring pipeline; the pressure relay and the overflow solenoid valve are electrically connected through a control system to close the overflow solenoid valve through the control system when the pressure relay reaches a preset pressure value; the accumulator cooperates with the one-way valve to adjust the pressure of the hydraulic oil in the liquid inlet pipeline.

7. The upper cover opening device of the conditioning machine according to claim 6, characterized in that The pressure maintaining system further includes: A return pipe group is arranged on the liquid inlet pipeline between the one-way valve and the one-way throttle valve, and the return pipe group is connected to the hydraulic station; the return pipe group is connected in parallel with the overflow pipe group.

8. The upper cover opening device of a tobacco conditioning machine according to claim 7, wherein the return pipe group includes a return pipeline, the return pipeline is arranged on the liquid inlet pipeline between the one-way throttle valve and the one-way valve, and a solenoid valve is arranged on the return pipeline.

9. The upper cover opening device of a tobacco conditioning machine according to claim 3, wherein the hydraulic station includes: a fuel tank for storing hydraulic oil; an oil pump arranged on the liquid inlet pipeline between the fuel tank and the one-way valve; an oil pump motor is arranged on the oil pump, and the oil pump motor is used to drive the oil pump.

10. The upper cover opening device of a rehumidifier according to claim 9, characterized in that, The upper cover opening device of the tobacco conditioning machine further includes: an air filter arranged on the fuel tank.

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