A hydraulic cover moving machine device for blast furnace and a one-key automatic cover moving operation method

Abstract

The present application relates to a kind of hydraulic moving cover machine device of blast furnace, the device includes moving cover machine trolley, oil cylinder, curved track and walking track, wherein moving cover machine trolley includes wheel, hook crank, guide crank, slider, roller, roller crank and rotating shaft, and the roller can rotate coaxially with hook crank and guide crank around rotating shaft by crank.The piston rod of the oil cylinder is fixed to workshop, and the cylinder barrel of oil cylinder is movably connected on moving cover machine trolley, the cylinder barrel trunnion of oil cylinder is connected slider, slider slides in guide crank, realize the movable connection of cylinder barrel and trolley, and the cylinder barrel of oil cylinder advances or retreats to drive trolley to advance or retreat, when trolley moves, wheel moves on walking track, and roller moves on curved track, and the wheel is fixed on moving cover machine trolley body.This scheme utilizes an oil cylinder to realize the walking of moving cover machine and the lifting of ditch cover, utilizes stroke detection, PLC control and hydraulic valve, realizes the remote one-key automatic moving cover operation of moving cover machine.

Description

Technical Field

[0001] This invention relates to a hydraulic blast furnace cover shifting machine, belonging to the field of blast furnace ironmaking technology. Background Technology

[0002] In blast furnace ironmaking, molten iron flows from the taphole in front of the furnace, through the main blast furnace trough, and into the molten iron ladle for storage and transportation. During tapping, the molten iron temperature exceeds 1500 degrees Celsius, and there is splashing. Therefore, a cover-moving machine is used to move the trough cover over the molten iron to protect surrounding equipment and personnel. When tapping is almost complete, the cover is moved back, and the taphole is sealed. Existing blast furnace cover-moving machines are generally hydraulically controlled, with the trolley's horizontal movement and the cover's lifting and lowering controlled by hydraulic cylinders. When covering the trough, the cover-moving machine first moves to directly above the trough, and then the cover is lowered to the trough edge; when retracting, the cover is first lifted, and then the cover-moving machine retreats to the standby position. Due to the complex operating conditions at the blast furnace taphole, affected by high-temperature radiation, dust, and molten iron splashing, the use of a two-cylinder hydraulic cover-moving machine restricts the improvement of automation levels. Normally, the machine is operated using a control handle on the on-site control panel, or sometimes using a remote control. However, the blast furnace front cover moving machine has not yet been observed to operate automatically with a single click from a remote computer.

[0003] Existing technology includes a fully hydraulic suspended cover-moving machine, where the machine's movement and the lifting of the trough cover are controlled by hydraulic cylinders (Patent Application No.: CN201410198871.9 Fully Hydraulic Suspended Cover-Moving Machine). This technology is difficult to automate in complex furnace conditions. To overcome the limitation of the travel cylinder's stroke, some technologies use hydraulic motors to drive the cover-moving machine, ensuring accurate movement and stopping (Patent Application No.: CN200920128307.4 A Hydraulically Driven Self-Propelled Cover-Moving Machine). However, this technology still uses hydraulic cylinders to control the lifting of the trough cover. Other technologies use slewing bearings and their drives to adapt to the complex furnace environment (Patent Application No.: CN201310278302.0 Rotary Cover-Unlocking Machine and Rotary Cover-Unlocking Method for Blast Furnace Iron Trench). However, this technology still uses hydraulic cylinders to control the lifting of the trough cover. These technologies achieve furnace trench cover operation through different techniques, but the movement of the cover transfer machine and the lifting and lowering of the trench cover are controlled by hydraulic cylinders or motors respectively, which restricts the realization of automated operation. Therefore, there is an urgent need for a new solution to solve the above-mentioned technical problems. Summary of the Invention

[0004] This invention addresses the problems existing in the prior art by providing a blast furnace hydraulic cover-moving machine device. This technical solution solves the limitations of the complex working conditions in front of the blast furnace on the automated operation of the cover-moving machine, realizing remote one-button automatic cover-moving operation. This solution provides a blast furnace hydraulic cover-moving machine device and its one-button automatic cover-moving method, using a single hydraulic cylinder to realize the movement of the cover-moving machine and the lifting and lowering of the trench cover, and using stroke detection, PLC control and hydraulic valves to realize remote one-button automatic cover-moving operation.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a blast furnace hydraulic cover-shifting machine device, the device comprising a cover-shifting machine trolley, a hydraulic cylinder, a curved track, and a traveling track, wherein the cover-shifting machine trolley includes wheels, a hook crank, a guide crank, a slider, rollers, roller cranks, and a rotating shaft. The rollers are mounted on the roller cranks, and the roller cranks, hook cranks, and guide cranks rotate around the same rotating shaft. The piston rod of the hydraulic cylinder is fixed to the workshop, and the cylinder barrel is movably connected to the cover-shifting machine trolley. The cylinder barrel trunnion is connected to the slider, and the slider can slide within the guide crank, realizing a movable connection between the cylinder barrel and the trolley. The forward or backward movement of the hydraulic cylinder barrel drives the trolley to move forward or backward. The traveling track and the curved track are fixed to the workshop. When the trolley moves, the wheels move on the traveling track, and the rollers move on the curved track. The wheels are fixed to the body of the cover-shifting machine trolley.

[0006] The curved track includes straight sections and circular arc sections. When the hydraulic cylinder drives the cover-moving trolley to move back and forth, the rollers move in the straight section, the hydraulic cylinder trunnion slider is at the end of the guide crank, and the hook crank, which is coaxial with the roller crank, is in a raised state. The roller crank, guide crank, and hook crank are relatively stationary with respect to the rotating shaft, thus enabling the trolley to lift the trench cover and move back and forth. When the hydraulic cylinder drives the trench cover to move up and down, the rollers move in the circular arc section. At this time, the cover-moving trolley moves to the end of its stroke and is stationary relative to the travel track. The slider on the hydraulic cylinder trunnion slides in the guide crank, and the guide crank and hook crank, which are coaxial with the roller crank, rotate relative to the rotating shaft, thus enabling the trench cover to move up and down.

[0007] The system utilizes a slider structure and a curved track to control both walking and lifting movements with a single hydraulic cylinder. When the cap-moving machine moves forward from its working position, the cylinder piston rod extends, the wheels move on the walking track, and the rollers move on the straight section of the curved track. The cylinder then drives the trolley forward. Once the trolley reaches its travel end point, it is positioned directly above the iron ditch and stationary relative to the factory building. At this point, the cylinder continues to move forward, the wheels remain stationary, the rollers move on the arc section of the curved track, and the slider on the cylinder's trunnion slides within the guide crank. The guide crank and hook crank, coaxial with the roller crank, rotate relative to the pivot, causing the cylinder to lower the hook. When the hook rises and the trolley reverses, the cylinder's retraction control reverses the forward movement.

[0008] The device also includes a displacement detection device, a hydraulic control valve, and a PLC control terminal, used to detect and control the action of the hydraulic cover-moving machine, thereby realizing one-button automatic cover-moving. The displacement detection device is used to detect the stroke of the trolley cylinder.

[0009] The displacement detection device is configured as a displacement sensor, which is installed on the cylinder barrel to achieve real-time monitoring of the cylinder displacement. The detection signal is transmitted to the PLC control terminal for reception via wired or wireless means.

[0010] The displacement detection device includes an encoder, a gear, and a rack. The encoder and gear are coaxially mounted and fixed to the main body of the plant. The rack is fixed to the cylinder barrel. When the cover-moving machine trolley moves, the rack moves together with the cylinder barrel. The gear and rack mesh with each other. The movement of the rack drives the gear to rotate. The amount of rotation is detected by the encoder, which can realize real-time monitoring of the cylinder displacement. The detection signal is transmitted to the PLC control terminal for reception via wired or wireless means.

[0011] The PLC control terminal can receive displacement signals from the displacement detection device to determine the position of the cover-moving machine trolley. The PLC control terminal can also send signals to control the state of the hydraulic valve.

[0012] The hydraulic control valve is used to control the extension or retraction of the piston rod of the hydraulic cylinder, thereby controlling the forward or backward movement of the trolley. When the cover-moving machine needs to move forward or the trench cover needs to be lowered, the hydraulic control valve controls hydraulic oil to enter the rodless chamber of the hydraulic cylinder, at which point the piston rod extends and the cylinder moves forward. When the cover-moving machine needs to move backward or the trench cover needs to be raised, the hydraulic control valve controls hydraulic oil to enter the rod chamber of the hydraulic cylinder, at which point the piston rod retracts and the cylinder moves backward. The hydraulic control valve can receive signals from the PLC control terminal and, based on different signals, controls hydraulic oil to enter either the rod or rodless chamber of the hydraulic cylinder. When there is no signal, hydraulic oil does not enter the cylinder. The hydraulic control valve and the hydraulic cylinder are connected through an oil pipe, and hydraulic oil enters the cylinder through the control valve and the oil pipe, driving the cylinder to move.

[0013] The one-click automatic cap removal operation method is as follows:

[0014] When a "Work" command is issued via the PLC control terminal, the cap-shifting machine automatically moves the cap to the working position without manual intervention; when a "Standby" command is issued via the PLC control terminal, the cap-shifting machine automatically moves the cap to the standby position without manual intervention.

[0015] When a "work" command is issued via the PLC control terminal, the hydraulic control valve receives the command signal and controls the hydraulic oil to enter the rodless chamber of the cylinder. At this time, the piston rod extends and the cylinder moves forward. The displacement detection device detects the displacement of the trolley and sends the displacement signal to the PLC control terminal in real time. The PLC control terminal determines whether the displacement signal has reached the working position. If it has not reached the working position, no command change is made and the cylinder continues to move forward until the PLC control terminal determines that the working position has been reached. Then the PLC control terminal stops issuing the "work" command, the hydraulic control valve becomes silent, and the hydraulic oil no longer enters the cylinder. At this time, the trolley stops and remains in the working position. The "work" command is completed, realizing the one-button automatic cap transfer to the working position.

[0016] When a "standby" command is issued via the PLC control terminal, the hydraulic control valve receives the command signal and controls the hydraulic oil to enter the rod chamber of the cylinder. At this time, the piston rod retracts, and the cylinder moves backward. The displacement detection device detects the displacement of the trolley and sends the displacement signal to the PLC control terminal in real time. The PLC control terminal determines whether the displacement signal has reached the standby position. If it has not reached the standby position, no command is made, and the cylinder continues to move backward until the PLC control terminal determines that it has reached the standby position. Then, the PLC control terminal stops issuing "standby" commands, the hydraulic control valve becomes silent, and the hydraulic oil no longer enters the cylinder. At this time, the trolley stops and remains in the standby position. The "standby" command is completed, realizing the one-button automatic lid transfer to the standby position.

[0017] Compared with the prior art, the present invention has the following advantages: the technical solution provides a blast furnace hydraulic cover-moving machine device and its one-button automatic cover-moving method. It uses a single oil cylinder to realize the movement of the cover-moving machine and the lifting and lowering of the trench cover, reducing the number of oil cylinders or motors in the cover-moving machine. By using stroke detection, PLC control and hydraulic valves, it realizes remote one-button automatic cover-moving operation of the cover-moving machine, solves the limitation of the complex working conditions in front of the blast furnace on the automation operation of the cover-moving machine, is more suitable for the complex working conditions in front of the blast furnace, can reduce the labor intensity and safety risks of operators, and improve the automation level of furnace front operation. Attached Figure Description

[0018] Figure 1 This is a front view of the hydraulic cover transfer machine.

[0019] Figure 2 This is a top view of the hydraulic cover transfer machine.

[0020] Figure 3 , Figure 4 The following are front and top views of the hydraulic cap-moving machine device in the embodiment;

[0021] Figure 5 This is a schematic diagram of the control functions of the cover-moving machine.

[0022] In the diagram, 1 is the hydraulic cylinder, 2 is the wheel, 3 is the cover-moving machine trolley, 4 is the curved track, 5 is the traveling track, 6 is the hook crank, 7 is the shaft, 8 is the roller crank, 9 is the roller, 10 is the slider, 11 is the guide crank, 12 is the gear, 13 is the encoder, and 14 is the rack. Detailed Implementation

[0023] To enhance understanding of the present invention, the embodiments will be described in detail below with reference to the accompanying drawings.

[0024] Example 1: See Figures 1-5A hydraulic blast furnace cover-shifting machine device is disclosed. The device includes a cover-shifting trolley 3, a hydraulic cylinder 1, a curved track 4, and a traveling track 5. The cover-shifting trolley includes wheels 2, hook cranks 6, guide cranks 11, sliders 10, rollers 9, roller cranks 8, and a rotating shaft 7. The rollers 9 are mounted on the roller cranks 8, and the roller cranks 8, hook cranks 6, and guide cranks 11 rotate around the same rotating shaft 7. The piston rod of the hydraulic cylinder 1 is fixed to the workshop building, and the cylinder barrel of the hydraulic cylinder 1 is movably connected to the cover-shifting trolley 3. The cylinder barrel of the hydraulic cylinder 1 is trunned to the slider 10, which can slide within the guide crank 11, thus achieving a movable connection between the cylinder barrel and the trolley. The forward or backward movement of the cylinder barrel of the hydraulic cylinder 1 drives the trolley 3 to move forward or backward. The traveling track 5 and the curved track 4 are fixed to the workshop building. When the trolley moves, the wheels 2 move on the traveling track 5, and the rollers 9 move on the curved track 4. The wheels 2 are fixed to the body of the cover-shifting trolley.

[0025] The curved track 4 includes a straight section and a circular arc section. When the hydraulic cylinder 1 drives the cover-moving trolley to move back and forth, the roller moves in the straight section, the hydraulic cylinder trunnion slider is at the end of the guide crank, and the hook crank, which is coaxial with the roller crank, is in a raised state. The roller crank, guide crank, and hook crank are relatively stationary with respect to the rotating shaft, so that the trolley lifts the trench cover and moves back and forth. When the hydraulic cylinder drives the trench cover to move up and down, the roller moves in the circular arc section. At this time, the cover-moving trolley moves forward to the end of the stroke and is stationary relative to the travel track. The slider on the hydraulic cylinder trunnion slides in the guide crank, and the guide crank and hook crank, which are coaxial with the roller crank, rotate relative to the rotating shaft, so as to realize the trench cover lifting and lowering action.

[0026] The system utilizes a slider structure and a curved track to control both walking and lifting movements with a single hydraulic cylinder. When the cap-moving machine moves forward from its working position, the cylinder piston rod extends, the wheels move on the walking track, and the rollers move on the straight section of the curved track. The cylinder then drives the trolley forward. Once the trolley reaches its travel end point, it is positioned directly above the iron ditch and stationary relative to the factory building. At this point, the cylinder continues to move forward, the wheels remain stationary, the rollers move on the arc section of the curved track, and the slider on the cylinder's trunnion slides within the guide crank. The guide crank and hook crank, coaxial with the roller crank, rotate relative to the pivot, causing the cylinder to lower the hook. When the hook rises and the trolley reverses, the cylinder's retraction control reverses the forward movement.

[0027] The device also includes a displacement detection device, a hydraulic control valve, and a PLC control terminal, used to detect and control the action of the hydraulic cover-moving machine, thereby realizing one-button automatic cover-moving. The displacement detection device is used to detect the stroke of the trolley cylinder.

[0028] The displacement detection device in this embodiment includes an encoder 13, a gear 12, and a rack 14. The encoder 14 and gear 12 are coaxially mounted and fixed to the main body of the plant. The rack 14 is fixed to the cylinder of the hydraulic cylinder 1. When the cover-moving machine trolley 3 moves, the rack 14 moves together with the cylinder. The gear 12 and rack 14 mesh with each other. The movement of the rack drives the gear to rotate. The amount of rotation is detected by the encoder 13, which can realize real-time monitoring of the hydraulic cylinder displacement. The detection signal is transmitted to the PLC control terminal for reception via wired or wireless means.

[0029] The PLC control terminal can receive displacement signals from the displacement detection device to determine the position of the cover-moving machine trolley. The PLC can also send signals to control the state of the hydraulic valves. The hydraulic control valves are connected to the oil cylinders via oil pipes; hydraulic oil enters the oil cylinders through the control valves and oil pipes, driving the cylinders to move.

[0030] The hydraulic control valve is used to control the extension or retraction of the piston rod of the hydraulic cylinder, thereby controlling the forward or backward movement of the trolley. When the cover-moving machine needs to move forward or the trench cover needs to be lowered, the hydraulic control valve controls hydraulic oil to enter the rodless chamber of the hydraulic cylinder, at which point the piston rod extends and the cylinder moves forward. When the cover-moving machine needs to move backward or the trench cover needs to be raised, the hydraulic control valve controls hydraulic oil to enter the rod chamber of the hydraulic cylinder, at which point the piston rod retracts and the cylinder moves backward. The hydraulic control valve can receive signals from the PLC control terminal and, based on different signals, controls hydraulic oil to enter either the rod or rodless chamber of the hydraulic cylinder. When there is no signal, hydraulic oil does not enter the cylinder. The hydraulic control valve and the hydraulic cylinder are connected through an oil pipe, and hydraulic oil enters the cylinder through the control valve and the oil pipe, driving the cylinder to move.

[0031] Example 2: This example differs from Example 1 in that the displacement detection device uses a displacement sensor, which is fixedly mounted on the cylinder barrel. This allows for real-time monitoring of the cylinder displacement. The displacement signal detected by the sensor is transmitted to the PLC control terminal for reception via wired or wireless means. The remaining structure and advantages are the same as in Example 1.

[0032] Example 3: See Figures 1-5 The one-button automatic cap-shifting operation method is as follows: when the "work" command is sent from the PLC control terminal, the cap-shifting machine will automatically shift the cap to the working position; when the "standby" command is sent from the PLC control terminal, the cap-shifting machine will automatically shift the cap to the standby position.

[0033] When the "work" command is issued via the PLC control terminal, the hydraulic control valve receives the command signal and controls the hydraulic oil to enter the rodless chamber of the cylinder. At this time, the piston rod extends, the cylinder moves the trolley forward, the wheels move forward on the travel track, and the rollers move forward on the straight section of the curved track. The cylinder trunnion slider is at the end of the guide crank, and the hook crank, coaxial with the roller crank, is in the raised state. The roller crank, guide crank, and hook crank are stationary relative to the rotating shaft, and the trolley moves while lifting the trench cover. At this time, the rack on the cylinder moves with the cylinder, driving the gear to rotate. The encoder detects the displacement of the trolley and sends the displacement signal to the PLC control terminal in real time. The PLC control terminal determines whether the displacement signal has reached the working position. If it has not reached the working position, no command change is made, and the cylinder continues to move forward. When the trolley reaches the end of its stroke, it is directly above the iron trench and the trolley is stationary relative to the factory building. At this point, the cylinder barrel continues to advance, the wheel remains stationary, and the roller begins to move forward along the arc segment of the curved track. The slider on the cylinder barrel trunnion slides within the guide crank. The guide crank and hook crank, coaxial with the roller crank, rotate relative to the pivot. The movement of the cylinder barrel causes the groove cover on the hook to descend. After the hook descends to the working position, the PLC control terminal receives a displacement signal and determines that the working position has been reached. The PLC control terminal then stops issuing the "work" command, the hydraulic control valve becomes silent, hydraulic oil no longer enters the cylinder, the cylinder barrel stops moving, and the trolley stops, remaining in the working position. The "work" command is completed, achieving one-button automatic cover transfer to the working position.

[0034] When a "standby" command is issued via the PLC control terminal, the hydraulic control valve receives the command signal and controls the hydraulic oil to enter the rod chamber of the cylinder. At this time, the piston rod retracts, the cylinder barrel moves backward, the roller moves backward on the arc section of the curved track, the trolley remains stationary relative to the factory building, and the slider on the cylinder barrel trunnion slides within the guide crank. The guide crank and hook crank, coaxial with the roller crank, rotate relative to the rotating shaft. The movement of the cylinder barrel causes the trench cover on the hook to rise. At this time, the rack on the cylinder barrel moves backward with the cylinder barrel, driving the gear to rotate. The encoder detects the displacement of the trolley and sends the displacement signal to the PLC control terminal in real time. The PLC control terminal determines whether the displacement signal has reached the standby position. If it has not reached the standby position, no command change is made, and the cylinder barrel continues to move backward. After the slider on the cylinder barrel trunnion slides to the end of the guide crank, the hook crank, coaxial with the roller crank, is in the raised state. The roller crank, guide crank, and hook crank remain stationary relative to the rotating shaft, completing the trench cover raising action. The cylinder barrel continues to retract, and the rollers begin to move backward on the straight section of the curved track. The cylinder barrel drives the trolley wheels to move backward on the travel track. When the trolley reaches the standby position, the PLC control terminal receives the displacement signal and determines that it has reached the standby position. The PLC control terminal then stops issuing "standby" commands, the hydraulic control valve becomes silent, hydraulic oil no longer enters the cylinder, the cylinder barrel stops moving, and the trolley stops, remaining in the working position. The "standby" command is completed, realizing the one-button automatic cap transfer to the standby position.

[0035] In this embodiment, the one-click automatic cap-shifting operation method only requires the operator to press a button to issue a required command. The subsequent actions of the hydraulic cap-shifting machine are automatically detected and controlled by the encoder, hydraulic control valve and PLC control terminal, thereby realizing one-click automatic cap-shifting operation.

[0036] It should be noted that the above embodiments are not intended to limit the scope of protection of the present invention. Equivalent transformations or substitutions made based on the above technical solutions all fall within the scope of protection of the claims of the present invention.

Claims

1. A blast furnace hydraulic cover-moving machine device, characterized in that, The device includes a cap-shifting trolley, a hydraulic cylinder, a curved track, and a traveling track. The cap-shifting trolley includes wheels, a hook crank, a guide crank, a slider, rollers, roller cranks, and a rotating shaft. The rollers are mounted on the roller cranks, and the roller cranks, hook cranks, and guide cranks rotate around the same rotating shaft. The piston rod of the hydraulic cylinder is fixed to the factory building, and the cylinder barrel is movably connected to the cap-shifting trolley. The cylinder barrel trunnion is connected to the slider, which slides within the guide crank, thus achieving a movable connection between the cylinder barrel and the trolley. The forward or backward movement of the hydraulic cylinder barrel drives the trolley to move forward or backward. The traveling track and the curved track are fixed to the factory building. When the trolley moves, the wheels move on the traveling track, and the rollers move on the curved track. The wheels are fixed to the body of the cap-shifting trolley. The curved track includes straight segments and circular arc segments; The device also includes a displacement detection device, a hydraulic control valve, and a PLC control terminal, which are used to detect and control the action of the hydraulic cover-moving machine, thereby realizing one-button automatic cover-moving. The displacement detection device is used to detect the stroke of the trolley cylinder. The displacement detection device is configured as a displacement sensor, which is installed on the cylinder barrel to realize real-time monitoring of the cylinder displacement. The detection signal is transmitted to the PLC control terminal for reception via wired or wireless means. The displacement detection device includes an encoder, a gear, and a rack. The encoder and gear are coaxially mounted and fixed to the main body of the plant. The rack is fixed to the cylinder barrel. When the cover-moving machine trolley moves, the rack moves with the cylinder barrel. The gear and rack mesh with each other. The movement of the rack drives the gear to rotate. The amount of rotation is detected by the encoder, realizing real-time monitoring of the cylinder displacement. The detection signal is transmitted to the PLC control terminal for reception via wired or wireless means. The PLC control terminal receives the displacement signal from the displacement detection device, determines the position of the cover-moving machine trolley, and sends a signal to control the state of the hydraulic valve. The hydraulic control valve is used to control the extension or retraction of the cylinder piston rod, and to control the forward or backward movement of the trolley. When the cover-moving machine needs to move forward or the trench cover needs to be lowered, the hydraulic control valve controls the hydraulic oil to enter the rodless chamber of the cylinder, at which time the piston rod extends and the cylinder moves forward. When the cover-moving machine needs to move backward or the trench cover needs to be raised, the hydraulic control valve controls the hydraulic oil to enter the rod chamber of the cylinder, at which time the piston rod retracts and the cylinder moves backward. The hydraulic control valve receives signals from the PLC control terminal and controls the hydraulic oil to enter the rod chamber or rodless chamber of the cylinder according to different signals. When there is no signal, the hydraulic oil does not enter the cylinder. The hydraulic control valve is connected to the cylinder through an oil pipe. The hydraulic oil enters the cylinder through the control valve and the oil pipe, driving the cylinder to move.

2. The method for achieving one-button automatic cover transfer using the blast furnace hydraulic cover transfer machine device of claim 1, characterized in that, The method is as follows: When a "Work" command is issued via the PLC control terminal, the cap-shifting machine automatically moves the cap to the working position without manual intervention; when a "Standby" command is issued via the PLC control terminal, the cap-shifting machine automatically moves the cap to the standby position. When a "work" command is issued via the PLC control terminal, the hydraulic control valve receives the command signal and controls the hydraulic oil to enter the rodless chamber of the cylinder. At this time, the piston rod extends and the cylinder moves forward. The displacement detection device detects the displacement of the trolley and sends the displacement signal to the PLC control terminal in real time. The PLC control terminal determines whether the displacement signal has reached the working position. If it has not reached the working position, no command change is made and the cylinder continues to move forward until the PLC control terminal determines that the working position has been reached. Then the PLC control terminal stops issuing the "work" command, the hydraulic control valve becomes silent, and the hydraulic oil no longer enters the cylinder. At this time, the trolley stops and remains in the working position. The "work" command is completed, realizing the one-button automatic cap transfer to the working position. When a "standby" command is issued via the PLC control terminal, the hydraulic control valve receives the command signal and controls the hydraulic oil to enter the rod chamber of the cylinder. At this time, the piston rod retracts, and the cylinder moves backward. The displacement detection device detects the displacement of the trolley and sends the displacement signal to the PLC control terminal in real time. The PLC control terminal determines whether the displacement signal has reached the standby position. If it has not reached the standby position, no command is made, and the cylinder continues to move backward until the PLC control terminal determines that the standby position has been reached. Then, the PLC control terminal stops issuing "standby" commands, the hydraulic control valve becomes silent, and the hydraulic oil no longer enters the cylinder. At this time, the trolley stops and remains in the standby position. The "standby" command is completed, realizing the one-button automatic lid transfer to the standby position.

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