阅读说明：本技术 一种全自动保(泄)压功能的辊压机液压系统 (Roller press hydraulic system with full-automatic pressure maintaining (releasing) function ) 是由 刘秋勇 温帝文 李佳乐 于 2021-09-01 设计创作，主要内容包括：本发明公开了一种全自动保(泄)压功能的辊压机液压系统,属于辊压机制造领域,其主旨在于解决辊压机的液压系统减压时靠大通径先导式板式溢流阀或二通插装溢流阀组件减压,减压速度不可控,减压后压力过低再次启动电机油泵进行补压的问题。主要方案包括,本液压系统至少包括：液压油箱、电机泵组、电磁换向阀、单向阀、减压/溢流阀、高压球阀、压力传感器、蓄能器、辊压机左油缸和辊压机右油缸；所述液压系统所涉及的是一种全自动保(泄)压且带自动(强制)退辊功能的辊压机液压系统,本发明左右油缸系统均可独立全自动加压、泄压、也可同时自动加压、泄压,同时快速退辊。也可通过控制进行强制退辊。(The invention discloses a hydraulic system of a roller press with a full-automatic pressure maintaining (releasing) function, belongs to the field of manufacturing of roller presses, and aims to solve the problems that when the hydraulic system of the roller press is depressurized, a large-diameter pilot type plate overflow valve or a two-way plug-in overflow valve assembly is used for depressurizing, the depressurizing speed is uncontrollable, and after depressurization, a motor oil pump is restarted to supplement pressure due to too low pressure. The main scheme includes that the hydraulic system at least comprises: the device comprises a hydraulic oil tank, a motor pump set, an electromagnetic directional valve, a one-way valve, a pressure reducing/overflowing valve, a high-pressure ball valve, a pressure sensor, an energy accumulator, a left oil cylinder of the roller press and a right oil cylinder of the roller press; the hydraulic system relates to a full-automatic pressure maintaining (releasing) hydraulic system of a roller press with an automatic (forced) roller withdrawing function, and left and right oil cylinder systems can independently and fully automatically pressurize and release pressure, can also automatically pressurize and release pressure simultaneously, and can simultaneously and rapidly withdraw a roller. The roller can be forcibly withdrawn by control.)

1. The hydraulic system of the roller press with the full-automatic pressure maintaining function is characterized by comprising a hydraulic oil tank (6), a working pump (8), a first electric-grade magnetic reversing valve YV01(13.1), a second electric-grade magnetic reversing valve, a pressure transmitter, a roller press oil cylinder and a control unit;

the hydraulic oil tank (6) is connected with an oil inlet of a working pump (8), an oil outlet of the working pump (8) is connected with a port P of a first-stage electromagnetic directional valve, a port A of the first-stage electromagnetic directional valve YV01(13.1) is connected with a port P of a second-stage electromagnetic directional valve, and the port A of the second electromagnetic directional valve is connected with a port A of an oil cylinder of the rolling press and a pressure transmitter;

the control unit reads the pressure of the oil cylinder of the roller press through the pressure transmitter, when the pressure is lower than a set pressure value through the right pressure transmitter, the control unit controls the first electromagnetic directional valve YV01(13.1), the second electromagnetic directional valve and the working pump to work, the oil cylinder of the multi-roller press performs pressure compensation to reach the set working pressure value, and the control unit sends out an instruction to control the first electromagnetic directional valve YV01(13.1), the second electromagnetic directional valve and the working pump to stop working.

2. The hydraulic system of a roller press with the full-automatic pressure maintaining function according to claim 1, wherein the oil cylinder of the roller press comprises a left oil cylinder and a right oil cylinder, the pressure transmitters comprise a left pressure transmitter (17.2) and a right pressure transmitter (17.1), the second electromagnetic directional valve comprises a left electromagnetic directional valve YV03(13.2) and a right electromagnetic directional valve YV04(13.3),

the left electromagnetic directional valve YV03(13.2) is connected to a left oil cylinder and a left pressure transmitter (17.2) through a second-stage left check valve (12.2),

the right electromagnetic directional valve YV04(13.3) is connected to the right oil cylinder and the right pressure transmitter (17.1) through a second-stage right one-way valve (12.3).

3. The hydraulic system of the roller press with the full-automatic pressure maintaining function according to claim 1, characterized in that the second-stage left check valve (12.2) is connected to the left oil cylinder and the left pressure transmitter (17.2) through a left pressure reducing/overflowing valve (14.1),

the second-stage right check valve (12.3) is connected to the right oil cylinder and the right pressure transmitter (17.1) through a right pressure reducing/overflowing valve (14.2).

4. The hydraulic system of the roller press with the full-automatic pressure relief function is characterized in that an oil cylinder of the roller press comprises a hydraulic oil tank (6), a third-stage electromagnetic directional valve, a pressure transmitter, an oil cylinder of the roller press and a control unit;

the oil cylinder of the rolling mill is connected with a pressure transmitter and a third-stage electromagnetic reversing valve, and the third-stage electromagnetic reversing valve is connected to a hydraulic oil tank (6);

the control unit controls the third-stage electromagnetic directional valve to work when power is supplied, the oil cylinder of the roller press is decompressed, the pressure transmitter reads the pressure value reaching the set working pressure value, the control unit sends an instruction to control the third-stage electromagnetic directional valve to stop working when power is lost, and automatic decompression is completed.

5. The hydraulic system of a roller press with the full-automatic pressure relief function according to claim 4, wherein the oil cylinder of the roller press comprises a left oil cylinder and a right oil cylinder, the pressure transmitters comprise a left pressure transmitter (17.2) and a right pressure transmitter (17.1), the third stage electromagnetic directional valve comprises a left electromagnetic directional valve YV05(15.1) and a right electromagnetic directional valve YV06(15.2),

the left electromagnetic directional valve YV05(15.1) is connected to a left oil cylinder and a left pressure transmitter (17.2) through a left pressure reducing/overflowing valve (14.1),

and the right electromagnetic directional valve YV05(15.2) is connected to a right oil cylinder and a right pressure transmitter (17.2) through a right pressure reducing/overflowing valve (14.2).

6. A roller press hydraulic system with a full-automatic pressure maintaining (releasing) function, which is characterized in that,

the hydraulic control system comprises a hydraulic oil tank (6), a working pump (8), a first electromagnetic reversing valve YV01(13.1), a second electromagnetic reversing valve, a third electromagnetic reversing valve, a pressure transmitter, a roller press oil cylinder and a control unit;

the hydraulic oil tank (6) is connected with an oil inlet of a working pump (8), an oil outlet of the working pump (8) is connected with a port P of a first-stage electromagnetic directional valve, a port A of the first-stage electromagnetic directional valve (13.1) is connected with a port P of a second-stage electromagnetic directional valve, and the port A of the second electromagnetic directional valve is connected with a port A of a rolling press oil cylinder and a pressure transmitter;

the roller press oil cylinder is connected with a third-stage electromagnetic directional valve, and the third-stage electromagnetic directional valve is connected to a hydraulic oil tank (6).

7. The hydraulic system of a roller press with a full-automatic pressure maintaining (releasing) function according to claim 6, characterized by further comprising an electromagnetic on-off valve and an energy accumulator oil source, wherein the energy accumulator oil source is connected to a roller press oil cylinder through the electromagnetic on-off valve.

8. The hydraulic system of the roller press with the full-automatic pressure maintaining (releasing) function according to claim 6, characterized by further comprising a solenoid directional valve YV02(13.4), wherein a port P of the solenoid directional valve YV02(13.4) is connected with a port B of the first-stage solenoid directional valve (13.1), and a port A of the solenoid directional valve YV02(13.4) is connected with a port B of the oil cylinder of the roller press.

9. The hydraulic system of roller press with full-automatic pressure maintaining (releasing) function according to claim 6, wherein the oil cylinder of the roller press comprises a left oil cylinder and a right oil cylinder, and the pressure transmitter comprises a left pressure transmitter

(17.2) and a right pressure transmitter (17.1), the second electromagnetic reversing valve comprises a left electromagnetic reversing valve YV03(13.2) and a right electromagnetic reversing valve YV04(13.3),

the left electromagnetic directional valve YV03(13.2) is connected to a left oil cylinder and a left pressure transmitter (17.2) through a second-stage left check valve (12.2),

the right electromagnetic directional valve YV04(13.3) is connected to the right oil cylinder and the right pressure transmitter (17.1) through a second-stage right one-way valve (12.3).

10. The hydraulic system of the roller press with the full-automatic pressure maintaining (releasing) function according to claim 6, characterized in that the second-stage left check valve (12.2) is connected to the left oil cylinder and the left pressure transmitter (17.2) through a left pressure reducing/relieving valve (14.1),

the second-stage right check valve (12.3) is connected to the right oil cylinder and the right pressure transmitter (17.1) through a right pressure reducing/overflowing valve (14.2).

Technical Field

The invention belongs to the field of manufacturing of roller presses, and particularly relates to a roller press hydraulic system with a full-automatic pressure maintaining (releasing) function and a working method thereof.

Background

At present, when a hydraulic system of a plurality of domestic roller presses is depressurized, the pressure is reduced by a large-diameter pilot type plate overflow valve or a two-way plug-in overflow valve component, the depressurizing speed is uncontrollable, the pressure is too low after depressurization, and a motor oil pump is restarted to supplement the pressure, so that energy waste is caused.

Based on the above problems, a hydraulic system of a roller press with a full-automatic pressure maintaining (releasing) function is needed.

Disclosure of Invention

The invention aims to solve the problems that when a hydraulic system of a roller press is depressurized, the pressure is reduced by a large-diameter pilot type plate overflow valve or a two-way plug-in overflow valve component, the depressurization speed is uncontrollable, and after depressurization, a motor oil pump is restarted to supplement pressure due to too low pressure, so that energy is wasted.

In order to solve the technical problems, the invention adopts the following technical means:

the invention provides a hydraulic system of a roller press with a full-automatic pressure maintaining function, which comprises a hydraulic oil tank, a working pump, a first electromagnetic reversing valve YV01, a second electromagnetic reversing valve, a pressure transmitter, a roller press oil cylinder and a control unit, wherein the working pump is connected with the hydraulic oil tank;

the hydraulic oil tank is connected with an oil inlet of a working pump, an oil outlet of the working pump is connected with a P port of a first-stage electromagnetic directional valve, an A port of the first-stage electromagnetic directional valve YV01 is connected with a P port of a second-stage electromagnetic directional valve, and an A port of the second electromagnetic directional valve is connected with an A port of an oil cylinder of the rolling press and a pressure transmitter;

the control unit reads the pressure of the oil cylinder of the roller press through the pressure transmitter, when the pressure is lower than a set pressure value through the right pressure transmitter, the control unit controls the first electromagnetic directional valve YV01, the second electromagnetic directional valve and the working pump to work, the multi-roller press oil cylinder performs pressure compensation to reach the set working pressure value, and the control unit sends an instruction to control the first electromagnetic directional valve YV01, the second electromagnetic directional valve and the working pump to stop working.

In the technical scheme, the roller press oil cylinder comprises a left oil cylinder and a right oil cylinder, the pressure transmitter comprises a left pressure transmitter and a right pressure transmitter, the second electromagnetic reversing valve comprises a left electromagnetic reversing valve YV03 and a right electromagnetic reversing valve YV04,

the left electromagnetic directional valve YV03 is connected to the left oil cylinder and the left pressure transmitter through a second-stage left check valve,

and the right electromagnetic directional valve YV04 is connected to the right oil cylinder and the right pressure transmitter through a second-stage right check valve.

In the technical scheme, the second-stage left check valve is connected to the left oil cylinder and the left pressure transmitter through the left pressure reducing/overflowing valve,

and the second-stage right check valve is connected to the right oil cylinder and the right pressure transmitter through a right pressure reducing/overflowing valve.

The invention also provides a hydraulic system of the roller press with the full-automatic pressure relief function, wherein the oil cylinder of the roller press comprises a hydraulic oil tank, a third-stage electromagnetic directional valve, a pressure transmitter, the oil cylinder of the roller press and a control unit;

the oil cylinder of the rolling mill is connected with the pressure transmitter and the third-stage electromagnetic reversing valve, and the third-stage electromagnetic reversing valve is connected to the hydraulic oil tank;

the control unit controls the third-stage electromagnetic directional valve to work when power is supplied, the oil cylinder of the roller press is decompressed, the pressure transmitter reads the pressure value reaching the set working pressure value, the control unit sends an instruction to control the third-stage electromagnetic directional valve to stop working when power is lost, and automatic decompression is completed.

In the technical scheme, the roller press oil cylinder comprises a left oil cylinder and a right oil cylinder, the pressure transmitter comprises a left pressure transmitter and a right pressure transmitter, the third-stage electromagnetic directional valve comprises a left electromagnetic directional valve YV05 and a right electromagnetic directional valve YV06,

the left electromagnetic directional valve YV05 is connected to a left oil cylinder and a left pressure transmitter through a left pressure reducing/overflowing valve,

and the right electromagnetic directional valve YV05 is connected to a right oil cylinder and a right pressure transmitter through a right pressure reducing/overflowing valve.

The invention also provides a hydraulic system of the roller press with a full-automatic pressure maintaining (releasing) function, which comprises a hydraulic oil tank, a working pump, a first electric-level magnetic reversing valve YV01, a second electric-level magnetic reversing valve, a third-level electromagnetic reversing valve, a pressure transmitter, a roller press oil cylinder and a control unit;

the hydraulic oil tank is connected with an oil inlet of a working pump, an oil outlet of the working pump is connected with a P port of a first-stage electromagnetic directional valve, an A port of the first-stage electromagnetic directional valve is connected with a P port of a second-stage electromagnetic directional valve, and an A port of the second electromagnetic directional valve is connected with an A port of a cylinder of the rolling press and a pressure transmitter;

the roller press oil cylinder is connected with a third-stage electromagnetic directional valve, and the third-stage electromagnetic directional valve is connected to a hydraulic oil tank.

In the technical scheme, the rolling press oil cylinder further comprises an electromagnetic on-off valve and an energy accumulator oil source, and the energy accumulator oil source is connected to the rolling press oil cylinder through the electromagnetic on-off valve.

In the technical scheme, the rolling press further comprises an electromagnetic directional valve YV02, a P port of the electromagnetic directional valve YV02 is connected with a B port of the first-stage electromagnetic directional valve, and an A port of the electromagnetic directional valve YV02 is connected with the B port of the oil cylinder of the rolling press.

In the technical scheme, the roller press oil cylinder comprises a left oil cylinder and a right oil cylinder, the pressure transmitter comprises a left pressure transmitter and a right pressure transmitter, the second electromagnetic reversing valve comprises a left electromagnetic reversing valve YV03 and a right electromagnetic reversing valve YV04,

the left electromagnetic directional valve YV03 is connected to the left oil cylinder and the left pressure transmitter through the second-stage left check valve.

And the right electromagnetic directional valve YV04 is connected to the right oil cylinder and the right pressure transmitter through a second-stage right check valve.

In the technical scheme, the second-stage left check valve is connected to the left oil cylinder and the left pressure transmitter through the left pressure reducing/overflowing valve,

and the second-stage right check valve is connected to the right oil cylinder and the right pressure transmitter through a right pressure reducing/overflowing valve.

Because the invention adopts the technical scheme, the invention has the following beneficial effects:

the hydraulic system relates to a full-automatic pressure maintaining (releasing) hydraulic system of a roller press with an automatic (forced) roller withdrawing function, and left and right oil cylinder systems can independently and fully automatically pressurize and release pressure, can also automatically pressurize and release pressure simultaneously, and can simultaneously and rapidly withdraw a roller. The roller can be forcibly withdrawn by control. Effectively solves the problems commonly existing in the hydraulic system of the domestic roller press at present: when the pressure is reduced, the pressure is reduced by the large-drift-diameter pilot-operated overflow valve assembly, the high pressure of the system is completely relieved, the pressure supplementing speed is low after the pressure is reduced, the working efficiency of equipment is influenced, and energy waste is caused.

Drawings

FIG. 1 is a schematic view of the overall oil circuit of the present invention.

Description of reference numerals:

1-ball valve, 2-liquid thermometer, 3-electric heater, 4-oil suction filter, 5-air filter, 6-hydraulic oil tank, 7-motor, 8-working pump, 9.1-first anti-vibration pressure gauge, 9.2-second anti-vibration pressure gauge, 9.3-third anti-vibration pressure gauge, 10-high pressure filter, 11-overflow valve 12.1-first stage check valve, 12.2-second stage left check valve, 12.3-second stage right check valve, 13.1-first stage electromagnetic directional valve YV01, 13.2-second stage left electromagnetic directional valve YV03, 13.3-second stage right electromagnetic directional valve YV04, 13.4-electromagnetic directional valve YV02(AB is working, T is oil return port, P is pressure), 14.1-left decompression/overflow valve, 14.2-right decompression/overflow valve, 15.1-third-stage left electromagnetic directional valve YV05, 15.2-third-stage right electromagnetic directional valve YV06, 16.1-right electromagnetic on-off valve YV08, 16.2-left electromagnetic on-off valve YV07, 17.1-right pressure transmitter, 17.2-left pressure transmitter, 18.1-right high-pressure ball valve, 18.2-left high-pressure ball valve, 19.1-left first accumulator, 19.2-left second accumulator, 19.3-right first accumulator, 19.4-right second accumulator, 20.1-left first oil cylinder, 20.2-left second oil cylinder, 20.3-right first oil cylinder and 20.4-right second oil cylinder.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention provides that the hydraulic system at least comprises: the device comprises a hydraulic oil tank, a motor pump set, an electromagnetic directional valve, a one-way valve, a pressure reducing/overflowing valve, a high-pressure ball valve, a pressure sensor, an energy accumulator, a left oil cylinder of the roller press and a right oil cylinder of the roller press; the hydraulic system relates to a full-automatic pressure maintaining (releasing) hydraulic system of a roller press with an automatic (forced) roller withdrawing function, and left and right oil cylinder systems can independently and fully automatically pressurize and release pressure, can also automatically pressurize and release pressure simultaneously, and can simultaneously and rapidly withdraw a roller.

Example 1

The independent automatic pressure maintaining function of the left oil cylinder of the roller press is as follows:

the port A of the first-stage electromagnetic directional valve 13.1 is connected with the port P of the second-stage left electromagnetic directional valve YV 03; the port A of the second-stage left electromagnetic directional valve YV03 is connected with the port A of the second-stage left check valve 12.2; the port B of the second-stage left check valve 12.2 is connected with the port P of the 14.1 left pressure reducing/overflowing valve 14.1; the port A of the pressure reducing/overflowing valve 14.1 is respectively connected with the ports A of the left first oil cylinder 20.1 and the left second oil cylinder 20.2, the third anti-seismic pressure gauge 9.3, the left pressure transmitter 17.2, the port P of the left electromagnetic on-off valve YV0716.2 and the port A of the left ball valve 18.2; an X port of the pressure reducing/overflowing valve 14.1 is connected with a P port of a third-stage left electromagnetic directional valve YV 05; the port A of the third-stage left electromagnetic directional valve YV05 is connected with the oil tank; the port A of the left electromagnetic on-off valve YV07 is connected with an energy accumulator; the port B of the left ball valve 18.2 is connected to the tank.

The system reads the pressure of the left oil cylinder system through the left pressure transmitter 17.2, when the pressure of the system is lower than a set pressure value, a system program of the control unit controls the first-stage electromagnetic directional valve YV01 and the second-stage left electromagnetic directional valve YV03 to be electrified to work, pressure compensation is carried out on the left oil cylinder system, the set working pressure value is reached, the system program sends out an instruction that the first-stage electromagnetic directional valve YV01 and the second-stage left electromagnetic directional valve YV03 are electrified to stop working, automatic pressure compensation work of the system is completed, and the pressure of the oil cylinder system of the roller press is kept within a certain range.

Example 2

The independent automatic pressure maintaining function of the right oil cylinder of the roller press is as follows:

the system reads the pressure of the left oil cylinder system through the pressure transmitter 17.1, when the pressure of the system is lower than a set pressure value, a system program of the control unit controls the first-stage electromagnetic directional valve YV01 and the second-stage right electromagnetic directional valve YV04 to be electrified to work, pressure compensation is carried out on the left oil cylinder system, the set working pressure value is reached, the system program of the control unit sends out an instruction to the first-stage electromagnetic directional valve YV01 and the second-stage right electromagnetic directional valve YV04 to be electrified to stop working, automatic pressure compensation work of the system is completed, and the pressure of the oil cylinder system of the roller press is kept within a certain range.

Example 3

The left and right oil cylinders of the roller press have the function of automatic pressure maintaining at the same time:

the system reads (obtains smaller) pressure of the oil cylinder system through the pressure transmitter, when the pressure of the system is lower than a set pressure value, the control unit system program controls the first-stage electromagnetic directional valve YV01, the second-stage left electromagnetic directional valve YV03 and the second-stage right electromagnetic directional valve YV04 to be electrified to work, pressure compensation is carried out on the oil cylinder system, the set working pressure value is reached, the system program sends out an instruction to power-off stop work of the first-stage electromagnetic directional valve YV01, the second-stage left electromagnetic directional valve YV03 and the second-stage right electromagnetic directional valve YV04, automatic pressure compensation work of the system is completed, and the pressure of the oil cylinder system of the roller press is kept within a certain range.

Example 4

The independent automatic pressure relief function of the left oil cylinder of the roller press is as follows:

the system requires independent pressure relief of the left oil cylinder system through an instruction, the system of the control unit controls the third-stage left electromagnetic directional valve YV05 to be electrified to work, independent pressure relief is carried out on the left oil cylinder system, a pressure transmitter reads that a set working pressure value is reached, a system program sends out an instruction to stop working when the third-stage left electromagnetic directional valve YV05 is electrified, and automatic pressure relief work of the system is completed.

Example 5

The independent automatic pressure relief function of the right oil cylinder of the roller press is as follows:

the system requires independent pressure relief of the right oil cylinder system through an instruction, controls the third-stage right electromagnetic directional valve YV06 to work in an electrified mode, independently relieves the pressure of the right oil cylinder system, reads a set working pressure value through the pressure transmitter, sends an instruction to stop working when the third-stage right electromagnetic directional valve YV06 is powered off through a system program, and completes automatic pressure relief work of the system.

Example 6

The left oil cylinder and the right oil cylinder of the roller press have the function of automatic pressure relief at the same time:

the system simultaneously relieves the pressure of the left oil cylinder system and the right oil cylinder system according to the instruction requirements, the system simultaneously controls the third-stage left electromagnetic directional valve YV05 and the third-stage right electromagnetic directional valve YV06 to be electrified for work, the left oil cylinder system and the right oil cylinder system are simultaneously relieved in pressure, a pressure transmitter reads (obtains a larger value) to reach a set working pressure value, a system program sends out an instruction electromagnetic valve, the third-stage left electromagnetic directional valve YV05 and the third-stage right electromagnetic directional valve YV06 are electrified for stopping work, and the automatic pressure relief work of the system is completed.

Example 7

The roller press has the function of fast and automatic roller withdrawing:

when the roller press material is abnormal, the roller needs to be quickly and automatically withdrawn, the system controls the right electromagnetic on-off valve YV08 and the left electromagnetic on-off valve YV07 to be electrified to cut off an oil source of an energy accumulator, then controls the third-stage left electromagnetic reversing valve YV05 and the third-stage right electromagnetic reversing valve YV06 to be electrified simultaneously to realize quick unloading, and meanwhile, the roller press is pushed by the material to quickly withdraw the roller.

Example 8

The forced roll withdrawing function of the roll squeezer is as follows:

when materials are accumulated too much or other factors cause the blocking of the oil cylinder of the roller press and the roller cannot be automatically and quickly withdrawn, the roller needs to be forcibly withdrawn at the moment, the right electromagnetic on-off valve YV08 and the left electromagnetic on-off valve YV07 are controlled by the system to be simultaneously electrified to cut off an oil source of an energy accumulator, the third-stage left electromagnetic directional valve YV05 and the third-stage right electromagnetic directional valve YV06 are controlled to be simultaneously electrified to realize the quick unloading of the oil cylinder, and the electromagnetic directional valve YV02 is simultaneously controlled to be electrified to realize the forced withdrawal of the roller.

Example 9

The hydraulic system has the automatic circulating and filtering functions:

and starting the motor 7, and simultaneously, the first-stage electromagnetic directional valve YV01 and the electromagnetic directional valve YV02 lose power, so that the system realizes automatic circulating filtration and filters oil in the hydraulic oil tank.

Example 10

The hydraulic system has the manual pressure relief function:

when having a power failure, when needing to carry out maintenance to energy storage ware, pressure transmitter or roll squeezer oil cylinder, the roll squeezer is in the pressurize state again, and the accessible is opened right high-pressure ball valve 18.1, left high-pressure ball valve 18.2 and is carried out manual pressure release, and when second anti-seismic pressure meter 9.2, third anti-seismic pressure meter 9.3 reading are zero, manual pressure release is accomplished. And after the overhaul is finished, the right high-pressure ball valve 18.1 and the left high-pressure ball valve 18.2 of the high-pressure ball valve need to be restored to be in a closed state.