A semi-closed loop positioning control device and system of a cleaning rack and a pull plate trolley

Abstract

This invention discloses a semi-closed-loop positioning control device and system for a cleaning rack and a pull-plate trolley, relating to the technical field of wastewater treatment equipment. It includes: a cleaning rack equipped with a first proximity switch; a cleaning rack control switch comprising a first normally closed switch and a first normally open switch connected in series, one end of the control switch being electrically connected to the cleaning rack, and the first proximity switch being electrically connected to the first normally closed switch; a local electronic cabinet electrically connected to the other end of the control switch, providing power for the movement of the cleaning rack; and a control cabinet electrically connected to the first normally open switch. This invention electrically connects the cleaning rack and the local electronic cabinet through the series-connected first normally closed switch and first normally open switch, and links the first proximity switch with the first normally open switch. This allows the first normally closed switch to immediately disconnect when the first proximity switch is in position, cutting off power to the cleaning rack and enabling it to stop immediately after moving into position. This configuration simplifies wiring modifications, uses fewer electrical components, and reduces modification costs.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment equipment technology, specifically to a semi-closed-loop positioning control device and system for a cleaning rack and a pull plate trolley. Background Technology

[0002] The filter press is driven by a hydraulic oil pump, and the pressing, unloading, and cleaning processes require the coordinated movement of a plate-pulling trolley and a cleaning frame. In traditional designs, the starting and stopping of the plate-pulling trolley and cleaning frame have uncertain delays, thus requiring local PLC control to achieve millisecond-level response. Furthermore, the PLC's response time must be less than 65ms to achieve automated operation.

[0003] In the original design of the filter press, the entire plate machine control and operation consisted of an ET200S PLC and a SIEMENS touchscreen inside the cabinet. The local PLC was used to control the hydraulic circuit relays of the washing rack and the plate pulling trolley, as well as other electrical components. The control flow was as follows: the DCS issued a forward command, which was transmitted to the field PLC via the network. The PLC drove the contactor to engage, energizing the motor and causing the equipment to move. The proximity switch detected the position signal, which was transmitted back to the DCS via the PLC. The DCS processed the signal and then issued a stop command. After another transmission delay, the motor was de-energized.

[0004] Currently, a domestically produced DCS distributed control system is used, but the total delay is typically over 300ms and unstable. This causes the equipment to have already passed the target position when it receives a stop signal, requiring local PLC control for accurate positioning. Furthermore, due to limitations of the motor and hydraulic system, the local PLC control response time must be within 65ms to achieve accurate positioning. Otherwise, the automated cycle will be interrupted, requiring frequent manual intervention and preventing fully automated cleaning. To solve the delay problem, the industry has considered adopting a fully closed-loop servo control system or adding a high-speed DCS control scanning card.

[0005] However, existing solutions, whether it's changing the drive motor and oil circuit or adding a high-speed DCS control scanning card, are costly and complex to modify. Summary of the Invention

[0006] This invention provides a semi-closed-loop positioning control device and system for a cleaning rack and a pull plate trolley, which can solve the problems of high cost and complexity of modification by changing the drive motor and oil circuit or adding a high-speed DCS control scanning card.

[0007] In a first aspect, embodiments of the present invention provide a semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley, comprising: A cleaning rack, on which a first proximity switch is installed; A cleaning rack control switch includes a first normally closed switch and a first normally open switch connected in series. One end of the cleaning rack control switch is electrically connected to the cleaning rack, and the first proximity switch is electrically connected to the first normally closed switch. A local electronic cabinet is electrically connected to the other end of the control switch of the cleaning rack, and the local electronic cabinet provides power for the movement of the cleaning rack. The control cabinet is electrically connected to the first normally open switch; The control cabinet is used to control the first normally open switch to close, so that the cleaning rack moves. When the first proximity switch reaches the filter plate, the first proximity switch controls the first normally closed switch to open, so that the cleaning rack stops moving.

[0008] In conjunction with the first aspect, in one implementation, it further includes: Pull-out trolley; The control switch for the pull-plate trolley includes a second normally closed switch and a second normally open switch connected in series. The two ends of the control switch are electrically connected to the pull-plate trolley and the local electronic cabinet, respectively. The second normally open switch is electrically connected to the control cabinet. A second proximity switch is disposed on the cleaning rack and is electrically connected to the second normally closed switch. The control cabinet is used to control the closing of the second normally open switch, so that the plate-pulling trolley pulls the filter plate to move. When the filter plate reaches the second proximity switch, the second proximity switch controls the second normally closed switch to open, so that the plate-pulling trolley stops moving.

[0009] In conjunction with the first aspect, in one implementation, it further includes: A third proximity switch is disposed on the side of the cleaning rack away from the first proximity switch, and the third proximity switch is electrically connected to the second normally closed switch. When the filter plate reaches the third proximity switch, the second normally closed switch is opened, causing the cleaning rack to stop moving.

[0010] In conjunction with the first aspect, in one embodiment, the control cabinet is also electrically connected to the cleaning rack and the second proximity switch, and the control cabinet is also used to control the cleaning rack to clean the filter plate when it receives a signal from the second proximity switch.

[0011] In conjunction with the first aspect, in one embodiment, the control cabinet is also electrically connected to the second normally closed switch, and the control cabinet is also used to control the second normally open switch to open after receiving the second normally closed switch open signal, and then control the second normally closed switch to close.

[0012] In conjunction with the first aspect, in one embodiment, the control cabinet is electrically connected to the plate-pulling trolley and is used to control the plate-pulling trolley to clamp the filter plate until the clamping force reaches the clamping threshold, and then maintain the clamping force unchanged, thereby controlling the plate-pulling trolley to pull the filter plate to move.

[0013] In conjunction with the first aspect, in one embodiment, the control cabinet is further configured to acquire the traction force of the plate-pulling trolley, and when the traction force of the plate-pulling trolley reaches the clamping threshold, control the plate-pulling trolley to stop pulling and release the filter plate.

[0014] In conjunction with the first aspect, in one embodiment, the control cabinet is also electrically connected to the first normally closed switch. After receiving the first normally closed switch disconnect signal, the control cabinet controls the first normally open switch to disconnect and then controls the first normally closed switch to close.

[0015] In conjunction with the first aspect, in one implementation, it further includes: An operator station, which is connected to the control cabinet.

[0016] Secondly, embodiments of the present invention provide a semi-closed-loop positioning control system for a cleaning rack and a pull-plate trolley, including the aforementioned semi-closed-loop positioning control device for the cleaning rack and the pull-plate trolley.

[0017] The beneficial effects of the technical solutions provided by the embodiments of the present invention include: This invention discloses a semi-closed-loop positioning control device and system for a cleaning rack and a pull-plate trolley. The semi-closed-loop positioning control device includes: a cleaning rack with a first proximity switch mounted on it; a cleaning rack control switch, comprising a first normally closed switch and a first normally open switch connected in series, one end of the cleaning rack control switch being electrically connected to the cleaning rack, and the first proximity switch being electrically connected to the first normally closed switch; a local electronic cabinet electrically connected to the other end of the cleaning rack control switch, the local electronic cabinet providing power for the movement of the cleaning rack; and a control cabinet electrically connected to the first normally open switch. The control cabinet is used to control the first normally open switch to close, causing the cleaning rack to move. When the first proximity switch reaches the filter plate, the first proximity switch controls the first normally closed switch to open, causing the cleaning rack to stop moving. This invention electrically connects the cleaning rack and the local electronic cabinet through the first normally closed switch and the first normally open switch connected in series, and sets the first proximity switch and the first normally closed switch to be linked. This allows the first normally closed switch to be opened immediately after the first proximity switch reaches its position, cutting off power to the cleaning rack and enabling the cleaning rack to stop immediately after moving into position. This setup makes circuit modifications easier, requires fewer electrical components, and has lower costs. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of an embodiment of a semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley; Figure 2 A circuit diagram of an embodiment of a semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley.

[0020] In the diagram: 10, Operator station; 20, Control cabinet; 30, Local electronic cabinet; 40, Cleaning rack; 41, First proximity switch; 42, Cleaning position; 43, Second proximity switch; 44, Third proximity switch; 50, Pull-out trolley; 60, Filter plate; 70, Cleaning rack control switch; 71, First normally closed switch; 72, First normally open switch; 80, Pull-out trolley control switch; 81, Second normally closed switch; 82, Second normally open switch. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the field of wastewater treatment for wet flue gas desulfurization systems in thermal power plants, the cleaning frame and plate-pulling trolley of the filter press require precise positioning based on a DCS system to automate the cyclical operation of the sludge unloading process during the filter press sludge removal and cleaning process. However, because the DCS system is remotely controlled, the system transmission delay of the control signal exceeds 300ms, and the delay fluctuates greatly, causing the cleaning frame and plate-pulling trolley to fail to stop at the designated positions. Inaccurate positioning leads to discontinuous automated system operations, requiring manual monitoring. Due to inaccurate positioning, the equipment frequently experiences collisions and filter plate skipping during cleaning.

[0023] To address issues such as inaccurate positioning, frequent collisions, and filter plate skipping during cleaning, the industry has considered adopting a fully closed-loop servo control system. However, modifying the drive motor and oil circuit design is costly and complex, making it unsuitable for existing mass-produced conventional motor control systems. Alternatively, a high-speed DCS control scanning card could be added; however, this requires additional data input / output cards, necessitating at least one AI card, four DO cards, four DI cards, and two controllers per filter press unit. This is prohibitively expensive and requires authorization from the DCS equipment manufacturer, presenting significant technical challenges.

[0024] like Figure 1 , 2 As shown in the figure, an embodiment of the present invention discloses a semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley, comprising: a cleaning rack 40, on which a first proximity switch 41 is disposed; a cleaning rack control switch 70, which includes a first normally closed switch 71 and a first normally open switch 72 connected in series, one end of the cleaning rack control switch 70 being electrically connected to the cleaning rack 40, and the first proximity switch 41 being electrically connected to the first normally closed switch 71; a local electronic cabinet 30, which is electrically connected to the other end of the cleaning rack control switch 70, and the local electronic cabinet 30 providing power for the movement of the cleaning rack 40; and a control cabinet 20, which is electrically connected to the first normally open switch 72; the control cabinet 20 is used to control the first normally open switch 72 to close, causing the cleaning rack 40 to move, and when the first proximity switch 41 reaches the filter plate 60, the first proximity switch 41 controls the first normally closed switch 71 to open, causing the cleaning rack 40 to stop moving.

[0025] The cleaning rack 40 is movable, and a first proximity switch 41 is provided on the cleaning rack 40. When the first proximity switch 41 reaches the filter plate 60, the first proximity switch 41 generates a positioning signal. Furthermore, the first proximity switch 41 is a cleaning rack proximity switch, used to generate a cleaning rack positioning signal when the cleaning rack proximity switch reaches the filter plate 60.

[0026] The local electronic cabinet 30 is used to provide power for the movement of the cleaning rack 40.

[0027] The cleaning rack control switch 70 is composed of a first normally closed switch 71 and a first normally open switch 72 connected in series. The two ends of the cleaning rack control switch 70 are connected to the cleaning rack 40 and the local electronic cabinet 30, respectively. The cleaning rack 40, the local electronic cabinet 30 and the cleaning rack control switch 70 are connected to form a closed loop.

[0028] The first proximity switch 41 and the first normally closed switch 71 are electrically connected, and the control cabinet 20 and the first normally open switch 72 are electrically connected.

[0029] Furthermore, control cabinet 20 is a DCS control cabinet.

[0030] During operation, the control cabinet 20 controls the first normally open switch 72 to close, at which point the cleaning rack 40 is energized and moves. When the first proximity switch 41 on the cleaning rack 40 reaches the filter plate 60, the first proximity switch 41 generates a cleaning rack arrival signal and immediately controls the first normally closed switch 71 to open. At this time, the closed loop formed by the cleaning rack 40, the local electronic cabinet 30, and the cleaning rack control switch 70 is broken, and the cleaning rack 40 immediately stops moving, thus achieving the purpose of stopping the cleaning rack 40 immediately.

[0031] This invention electrically connects the cleaning rack and the local electronic cabinet by connecting a first normally closed switch and a first normally open switch in series. A first proximity switch is also linked to the first normally closed switch, allowing the first normally closed switch to immediately disconnect and cut off power to the cleaning rack once it reaches its designated position, thus stopping the cleaning rack as soon as it is in place. This design simplifies wiring modifications, uses fewer electrical components, and reduces modification costs.

[0032] like Figure 1 , 2 As shown, in one embodiment, it further includes: a pull-plate trolley 50; a pull-plate trolley control switch 80, which includes a second normally closed switch 81 and a second normally open switch 82 connected in series, the two ends of the pull-plate trolley control switch 80 being electrically connected to the pull-plate trolley 50 and the local electronic cabinet 30 respectively, and the second normally open switch 82 being electrically connected to the control cabinet 20; a second proximity switch 43, which is disposed on the cleaning rack 40, and the second proximity switch 43 being electrically connected to the second normally closed switch 81; the control cabinet 20 is used to control the second normally open switch 82 to close, so that the pull-plate trolley 50 pulls the filter plate 60 to move, and when the filter plate 60 reaches the second proximity switch 43, the second proximity switch 43 controls the second normally closed switch 81 to open, so that the pull-plate trolley 50 stops moving.

[0033] The trolley 50 can pull the filter plate 60 to move. The cleaning rack 40 is also equipped with a second proximity switch 43. The second proximity switch 43 is used to generate a signal that the filter plate to be washed is in place when the filter plate 60 reaches the second proximity switch 43.

[0034] The local electronic cabinet 30 is also used to provide power for the movement of the pull-out trolley 50.

[0035] The pull-plate trolley control switch 80 is composed of a second normally closed switch 81 and a second normally open switch 82 connected in series. The two ends of the pull-plate trolley control switch 80 are connected to the pull-plate trolley 50 and the local electronic cabinet 30, respectively. The pull-plate trolley 50, the local electronic cabinet 30 and the pull-plate trolley control switch 80 are connected to form a closed loop.

[0036] The second proximity switch 43 is electrically connected to the second normally closed switch 81, and the control cabinet 20 is connected to the second normally open switch 82.

[0037] During operation, the control cabinet 20 controls the second normally open switch 82 to close, at which point the pull-plate trolley 50 is energized and pulls the filter plate 60 to move. When the filter plate 60 moves to the second proximity switch 43, the second proximity switch 43 generates a signal indicating that the filter plate to be washed has reached its position, controlling the second normally closed switch 81 to open. At this time, the closed circuit formed by the pull-plate trolley 50, the local electronic cabinet 30, and the pull-plate trolley control switch 80 is broken, and the pull-plate trolley 50 immediately stops moving, thus achieving the purpose of stopping the pull-plate trolley 50 immediately.

[0038] This invention electrically connects the plate-pulling trolley and the local electronic cabinet through a second normally closed switch and a second normally open switch connected in series. A second proximity switch is also linked to the second normally closed switch, allowing the second normally closed switch to be opened immediately after the filter plate reaches the second proximity switch, cutting off power to the plate-pulling trolley and ensuring the trolley stops as soon as it reaches its designated position. This design simplifies wiring modifications, uses fewer electrical components, and reduces modification costs.

[0039] like Figure 1 , 2 As shown, in one embodiment, it further includes: a third proximity switch 44, which is disposed on the side of the cleaning rack 40 away from the first proximity switch 41, the third proximity switch 44 being electrically connected to the second normally closed switch 81; when the filter plate 60 reaches the third proximity switch 44, the second normally closed switch 81 is controlled to open, so that the cleaning rack 40 stops moving.

[0040] The third proximity switch 44 is located at the point where the cleaned filter plate 60 is placed. The third proximity switch 44 is also electrically connected to the second normally closed switch 81. When the cleaned filter plate 60 arrives at the third proximity switch 44, the third proximity switch 44 generates a cleaning filter plate arrival signal, which can independently control the second normally closed switch 81 to open.

[0041] During operation, after the filter plate 60 is cleaned at the cleaning rack 40 by the pull-plate trolley 50, the control cabinet 20 controls the pull-plate trolley 50 to continue moving the filter plate 60 towards the third proximity switch 44. When the filter plate 60 reaches the third proximity switch 44, the third proximity switch 44 generates a cleaning filter plate arrival signal, which controls the second normally closed switch 81 to open. At this time, the closed loop formed by the pull-plate trolley 50, the local electronic cabinet 30, and the pull-plate trolley control switch 80 is broken, and the pull-plate trolley 50 immediately stops moving, thus achieving the purpose of stopping the pull-plate trolley 50 immediately.

[0042] This invention, by setting a third proximity switch at the location where the cleaned filter plate is placed, can generate a signal indicating that the cleaned filter plate has reached its designated position after the plate-pulling trolley has pulled the filter plate to the designated position. This signal controls the second normally closed switch to open and cut off the power to the plate-pulling trolley, thus enabling the plate-pulling trolley to stop immediately after moving to the designated position where the cleaned filter plate is placed.

[0043] like Figure 1 ,2 As shown, in one embodiment, the control cabinet 20 is also electrically connected to the cleaning rack 40 and the second proximity switch 43. The control cabinet 20 is also used to control the cleaning rack 40 to clean the filter plate 60 when it receives a signal from the second proximity switch 43.

[0044] The cleaning rack 40 is equipped with a cleaning mechanism. The control cabinet 20 is electrically connected to the cleaning rack 40. The control cabinet 20 can control the cleaning mechanism to clean the filter plate 60 that has been pulled to the cleaning position 42. The control cabinet 20 is also electrically connected to the second proximity switch 43.

[0045] When the trolley 50 pulls the filter plate 60 to the second proximity switch 43, the second proximity switch 43 generates a signal indicating that the filter plate to be washed is in position. After receiving the signal, the control cabinet 20 controls the cleaning mechanism to clean the filter plate 60.

[0046] This invention connects the cleaning rack and the second proximity switch to the control cabinet, allowing the cleaning mechanism to clean the filter plates based on the arrival signal of the filter plates to be cleaned.

[0047] like Figure 1 , 2 As shown, in one embodiment, the control cabinet 20 is also electrically connected to the second normally closed switch 81. The control cabinet 20 is also used to control the second normally open switch 82 to open after receiving the signal of the second normally closed switch 81 being disconnected, and then control the second normally closed switch 81 to close.

[0048] The control cabinet 20 is also electrically connected to the second normally closed switch 81 for controlling the closing of the second normally closed switch 81.

[0049] When the pull-plate trolley 50 moves to the second proximity switch 43 or the third proximity switch 44, after the second proximity switch 43 or the third proximity switch 44 controls the second normally closed switch 81 to open, it is also necessary to reset the pull-plate trolley control switch 80 to ensure that the pull-plate trolley 50 can start the next operation.

[0050] After the second normally closed switch 81 is opened, the control cabinet 20 receives the signal that the filter plate to be washed or the signal that the filter plate to be cleaned is in place. It first controls the second normally open switch 82 to open, and then controls the second normally closed switch 81 to close, so as to reset to the initial state. During the reset process, opening the second normally open switch 82 first and then closing the second normally closed switch 81 can keep the closed loop formed by the pull-plate trolley 50, the local electronic cabinet 30 and the pull-plate trolley control switch 80 in an open state at all times.

[0051] This invention ensures that the plate-pulling trolley can be put into the next stage of operation by resetting the control switch of the plate-pulling trolley after the filter plate is pulled into place.

[0052] like Figure 1 As shown, in one embodiment, the control cabinet 20 is electrically connected to the plate-pulling trolley 50 and is used to control the plate-pulling trolley 50 to clamp the filter plate 60 until the clamping force reaches the clamping threshold. Then, the clamping force is kept constant, and the plate-pulling trolley 50 is controlled to pull the filter plate 60 to move.

[0053] The control cabinet 20 is electrically connected to the plate-pulling trolley 50 and is used to control the plate-pulling trolley 50 to clamp the filter plate 60 and to obtain the clamping force of the plate-pulling trolley 50 on the filter plate 60.

[0054] The plate-pulling trolley 50 is used to move the filter plate 60. During the traction process, to ensure the connection between the filter plate 60 and the plate-pulling trolley 50, a clamping mechanism is provided on the plate-pulling trolley 50. When the plate-pulling trolley 50 clamps the filter plate 60, the oil pressure corresponding to the clamped filter plate 60 will gradually increase until it reaches the clamping threshold. When the control cabinet 20 obtains the corresponding oil pressure reaching the clamping threshold, it means that the plate-pulling trolley 50 has clamped the filter plate 60. Then, the control cabinet 20 controls the plate-pulling trolley 50 to move.

[0055] This invention controls the clamping mechanism to hold the filter plate via a control cabinet and obtains the corresponding oil pressure during clamping. This ensures that the filter plate will not be damaged due to over-clamping during the clamping process.

[0056] like Figure 1 As shown, in one embodiment, the control cabinet 20 is also used to acquire the traction force of the plate-pulling trolley 50. When the traction force of the plate-pulling trolley 50 reaches the clamping threshold, the control cabinet 20 controls the plate-pulling trolley 50 to stop pulling and release the filter plate 60.

[0057] Since there are multiple filter plates 60, each filter plate 60 needs to be cleaned individually during the cleaning process. After the first filter plate 60 is cleaned, the third proximity switch 44 can be used to determine whether the pull-plate trolley 50 can pull the first filter plate 60 to the designated position. However, since the position of the third proximity switch 44 is fixed, the remaining filter plates 60, except for the first filter plate 60 that has been cleaned, cannot be positioned using the third proximity switch 44.

[0058] The specifications of the filter plate 60 are fixed, and the traction force required by the plate-pulling trolley 50 during the pulling of the filter plate 60 will remain within a stable range. When pulling other filter plates 60 besides the first filter plate 60, the traction force will be basically consistent with that of the first filter plate 60 being pulled and cleaned during transportation. However, when the filter plate 60 gets close to the first filter plate 60, the first filter plate 60 will hinder the plate-pulling trolley 50 from moving further, and at this time the traction force of the plate-pulling trolley 50 will gradually increase. When the control cabinet 20 detects that the traction force has reached the clamping threshold, it means that the filter plate 60 has been transported to the designated position. The control cabinet 20 then controls the plate-pulling trolley 50 to stop pulling and release the cleaned filter plate 60.

[0059] Furthermore, the control cabinet 20 is also used to acquire the traction force of the pull-plate trolley 50 after it releases the cleaned filter plate 60 and returns to continue pulling the filter plate 60 to be cleaned. During the return journey, the traction force of the pull-plate trolley 50 remains within a stable range. When the pull-plate trolley 50 contacts the filter plate 60 to be cleaned, the traction force of the pull-plate trolley 50 gradually increases due to the resistance of the filter plate 60. When the traction force reaches the traction threshold, it can be determined that the pull-plate trolley 50 is in contact with the filter plate 60 to be cleaned. At this point, the control cabinet 20 is used to clamp the filter plate 60 to be cleaned.

[0060] This invention, by setting a clamping threshold, can determine whether the cleaned filter plate has been placed in place based on the traction force reaching the clamping threshold when placing the filter plate.

[0061] like Figure 1 , 2 As shown, in one embodiment, the control cabinet 20 is also electrically connected to the first normally closed switch 71. After receiving the signal that the first normally closed switch 71 is disconnected, the control cabinet 20 controls the first normally open switch 72 to open and then controls the first normally closed switch 71 to close.

[0062] The control cabinet 20 is also electrically connected to the first normally closed switch 71 for controlling the closing of the first normally closed switch 71.

[0063] When the cleaning rack 40 moves and the first proximity switch 41 reaches the filter plate 60, after the first normally closed switch 71 is opened, the cleaning rack control switch 70 also needs to be reset to ensure that the cleaning rack 40 can start working in the next stage.

[0064] After the first normally closed switch 71 is opened, the control cabinet 20 receives the cleaning rack arrival signal, first controls the first normally open switch 72 to open, and then controls the first normally closed switch 71 to close, in order to reset to the initial state. During the reset process, opening the first normally open switch 72 first and then closing the first normally closed switch 71 ensures that the closed loop formed by the cleaning rack 40, the local electronic cabinet 30, and the cleaning rack control switch 70 remains open at all times.

[0065] This invention ensures that the cleaning rack can be put into the next stage of operation by resetting the control switch of the cleaning rack after it has been moved into place.

[0066] like Figure 1 As shown, in one embodiment, it further includes an operator station 10, which is connected to the control cabinet 20.

[0067] Operator station 10 communicates bidirectionally with control cabinet 20, receiving and parsing operating data from control cabinet 20 in real time, and simultaneously feeding back operator instructions to control cabinet 20, forming a complete closed-loop interactive process.

[0068] In one embodiment, the specific cleaning process is as follows: Control cabinet 20 first closes the first normally open switch 72, and local electronic cabinet 30 supplies power to the cleaning rack 40, causing the cleaning rack 40 to move towards the filter plate 60. When the first proximity switch 41 reaches the filter plate 60, it generates a cleaning rack arrival signal, simultaneously controlling the first normally closed switch 71 to open. At this time, the closed loop formed by the cleaning rack 40, local electronic cabinet 30, and cleaning rack control switch 70 is broken, and the cleaning rack 40 immediately stops moving. After receiving the cleaning rack arrival signal, control cabinet 20 first opens the first normally open switch 72 and then closes the first normally closed switch 71 to reset to the initial state.

[0069] Control cabinet 20 then controls the second normally open switch 82 to close, and the local electronic cabinet 30 supplies power to the plate-pulling trolley 50. The plate-pulling trolley 50 moves to the filter plate 60 and disconnects the second normally open switch 82. The plate-pulling trolley 50 stops moving and clamps the filter plate 60. When the plate-pulling trolley 50 clamps the filter plate 60, the oil pressure in the corresponding circuit will gradually increase until it reaches the clamping threshold. When control cabinet 20 detects that the corresponding oil pressure has reached the clamping threshold, it means that the plate-pulling trolley 50 has clamped the filter plate 60. Then, control cabinet 20 controls the second normally open switch 82 to close, and the plate-pulling trolley 50 pulls the filter plate 60 to the cleaning position 42. When the filter plate 60 reaches the second proximity switch 43, the second proximity switch 43 generates a signal indicating that the filter plate to be cleaned is in place, and simultaneously controls the second normally closed switch 81 to open. When the closed loop formed by the pull-plate trolley 50, the local electronic cabinet 30, and the pull-plate trolley control switch 80 is broken, the pull-plate trolley 50 immediately stops moving. After receiving the signal that the filter plate to be washed has arrived, the control cabinet 20 first controls the second normally open switch 82 to open, and then controls the second normally closed switch 81 to close, in order to reset to the initial state. After receiving the signal that the filter plate to be washed has arrived, the control cabinet 20 also controls the cleaning mechanism to clean the filter plate 60.

[0070] After cleaning, the control cabinet 20 controls the second normally open switch 82 to close, thereby controlling the pull-plate trolley 50 to continue pulling the cleaned filter plate 60 towards the third proximity switch 44. When the cleaned filter plate 60 reaches the third proximity switch 44, the third proximity switch generates a cleaned filter plate arrival signal and simultaneously controls the second normally closed switch 81 to open, causing the pull-plate trolley 50 to stop moving immediately. After receiving the cleaned filter plate arrival signal, the control cabinet 20 first controls the second normally open switch 82 to open, and then controls the second normally closed switch 81 to close, to reset to the initial state. After receiving the cleaned filter plate arrival signal, the control cabinet 20 also controls the clamping mechanism to release the cleaned filter plate 60.

[0071] After releasing the cleaned filter plate 60, the control cabinet 20 controls the pull-plate trolley 50 to move in the opposite direction, continuing to clamp and pull the filter plate 60 to be cleaned. After cleaning, it continues to pull the cleaned filter plate 60 to contact the previous cleaned filter plate 60. When the control cabinet 20 detects that the traction force has reached the clamping threshold, it means that the filter plate 60 has been transported to the designated position. The control cabinet 20 then controls the pull-plate trolley 50 to stop pulling and release the cleaned filter plate 60. The uncleaned filter plates 60 are cleaned and placed in sequence according to the same method, finally completing the automatic cleaning of all filter plates 60.

[0072] Furthermore, in some embodiments, due to limited space, during the cleaning process, the cleaning rack 40 moves towards the filter plate 60 to be cleaned once after each cleaning cycle. After the cleaning rack 40 moves once, the first normally open switch 72 and the first normally closed switch 71 reset to their initial states. After cleaning the previous filter plate 60, the control cabinet 20 controls the first normally open switch 72 to close, and the cleaning rack 40 moves towards the filter plate 60 again. When the first proximity switch 41 reaches the filter plate 60, the first proximity switch 41 generates a cleaning rack arrival signal and simultaneously controls the first normally closed switch 71 to open, and the cleaning rack 40 immediately stops moving. After receiving the cleaning rack arrival signal, the control cabinet 20 first controls the first normally open switch 72 to open, and then controls the first normally closed switch 71 to close, to reset to the initial state. This cycle repeats until all filter plates 60 are cleaned.

[0073] This invention also discloses a semi-closed-loop positioning control system for a cleaning rack and a pull-plate trolley, including the semi-closed-loop positioning control device for the cleaning rack and the pull-plate trolley.

[0074] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0075] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0076] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley, characterized in that, include: A cleaning rack (40) is provided with a first proximity switch (41). The cleaning rack control switch (70) includes a first normally closed switch (71) and a first normally open switch (72) connected in series. One end of the cleaning rack control switch (70) is electrically connected to the cleaning rack (40), and the first proximity switch (41) is electrically connected to the first normally closed switch (71). The local electronic cabinet (30) is electrically connected to the other end of the cleaning rack control switch (70), and the local electronic cabinet (30) provides power for the movement of the cleaning rack (40); Control cabinet (20), which is electrically connected to the first normally open switch (72); The control cabinet (20) is used to control the first normally open switch (72) to close, so that the cleaning rack (40) moves. When the first proximity switch (41) reaches the filter plate (60), the first proximity switch (41) controls the first normally closed switch (71) to open, so that the cleaning rack (40) stops moving.

2. The semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley according to claim 1, characterized in that, Also includes: Pull-out trolley (50); The control switch (80) for the pull-plate trolley includes a second normally closed switch (81) and a second normally open switch (82) connected in series. The two ends of the control switch (80) are electrically connected to the pull-plate trolley (50) and the local electronic cabinet (30) respectively. The second normally open switch (82) is electrically connected to the control cabinet (20). The second proximity switch (43) is disposed on the cleaning rack (40) and is electrically connected to the second normally closed switch (81); The control cabinet (20) is used to control the second normally open switch (82) to close, so that the pull plate trolley (50) pulls the filter plate (60) to move. When the filter plate (60) reaches the second proximity switch (43), the second proximity switch (43) controls the second normally closed switch (81) to open, so that the pull plate trolley (50) stops moving.

3. The semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley according to claim 2, characterized in that, Also includes: A third proximity switch (44) is disposed on the side of the cleaning rack (40) away from the first proximity switch (41), and the third proximity switch (44) is electrically connected to the second normally closed switch (81); When the filter plate (60) reaches the third proximity switch (44), the second normally closed switch (81) is opened, causing the cleaning rack (40) to stop moving.

4. The semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley according to claim 3, characterized in that: The control cabinet (20) is also electrically connected to the cleaning rack (40) and the second proximity switch (43). The control cabinet (20) is also used to control the cleaning rack (40) to clean the filter plate (60) when it receives a signal from the second proximity switch (43).

5. A semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley according to claim 2 or 3, characterized in that: The control cabinet (20) is also electrically connected to the second normally closed switch (81). The control cabinet (20) is also used to control the second normally open switch (82) to open after receiving the disconnection signal of the second normally closed switch (81), and then control the second normally closed switch (81) to close.

6. The semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley according to claim 2, characterized in that: The control cabinet (20) is electrically connected to the plate-pulling trolley (50) and is used to control the plate-pulling trolley (50) to clamp the filter plate (60) until the clamping force reaches the clamping threshold. Then, the clamping force remains unchanged and the plate-pulling trolley (50) is controlled to pull the filter plate (60) to move.

7. The semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley according to claim 2, characterized in that: The control cabinet (20) is also used to obtain the traction force of the plate pulling trolley (50). When the traction force of the plate pulling trolley (50) reaches the clamping threshold, the control cabinet (20) is used to stop the traction and release the filter plate (60).

8. The semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley according to claim 1, characterized in that: The control cabinet (20) is also electrically connected to the first normally closed switch (71). After receiving the signal that the first normally closed switch (71) is disconnected, the control cabinet (20) controls the first normally open switch (72) to open and then controls the first normally closed switch (71) to close.

9. The semi-closed-loop positioning control device for a cleaning rack and a pull-plate trolley according to claim 1, characterized in that, Also includes: Operator station (10) is connected to the control cabinet (20).

10. A semi-closed-loop positioning control system for a cleaning rack and a pull-plate trolley, characterized in that, The semi-closed-loop positioning control device includes the cleaning rack and pull plate trolley as described in any one of claims 1-4.

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