A method and device for positioning and sensing a filter plate and a pull plate trolley of a plate-and-frame filter press
By installing a wireless sensing device on the plate and frame filter press to detect the sensing elements at both ends of the filter plates, the problem of filter plate misalignment during the pressing or pulling process is solved, achieving precise positioning of the filter plates, avoiding leakage and equipment damage, and improving the reliability of automated operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- 武汉钢铁有限公司
- Filing Date
- 2022-12-06
- Publication Date
- 2026-05-15
AI Technical Summary
The filter plates and the plate pulling trolley of the plate and frame filter press are prone to misalignment during the pressing or pulling process, which can lead to problems such as misalignment of the sealing surface, leakage, damage to the plate pulling trolley and the flushing mechanism. Existing technology cannot achieve precise positioning.
Multiple pairs of wireless sensing devices are used to install sensing elements on both sides of the crossbeams and at both ends of the filter plates in the plate and frame filter press. By detecting the time synchronization and numbering consistency of the sensing elements, the offset and misalignment of the filter plates can be determined, providing a precise positioning sensing method and device.
It achieves precise positioning of the filter plates, avoids offset and misalignment, prevents leakage and equipment damage, and improves the intelligent operation level of the plate and frame filter press.
Smart Images
Figure CN115845494B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of plate and frame filter presses, and more specifically, to a method and apparatus for positioning and sensing filter plates and plate pulling trolleys in a plate and frame filter press. Background Technology
[0002] Plate and frame filter presses are widely used in food, pharmaceutical, mining, and metallurgical industries due to their advantages such as high filtration driving force, high filter cake solids content, clear filtrate, high solids recovery rate, and low consumption of sludge conditioning chemicals. Currently, automatic operation of plate and frame filter presses is achieved. Most automated actions are based on limit switches installed on the press body, which collect digital signals and output control steps such as: triggering the plate pulling action based on the main push plate's backward travel limit switch; triggering the liquid receiving plate closing action based on the pull plate's backward travel limit switch; triggering the filtration / rinsing action based on the liquid receiving plate's upper limit switch; triggering the main push plate's pressure release and backward movement based on the liquid receiving plate's lower limit switch; and triggering the rinsing rod's downward / upward movement based on the rinsing rod's upper / lower limit switches, etc.
[0003] The filter plates and plate-pulling trolley of a plate and frame filter press are crucial components for filtration, separation, and unloading. However, due to the inability to collect positioning information, several problems exist in actual operation: 1. Shifting of the filter plates during the pressing process cannot be detected, easily leading to misalignment of the sealing surfaces and potential leakage. 2. The plate-pulling trolley is hydraulically driven, and its forward / reverse movements are time-controlled, i.e., forward for N seconds, stop for N seconds, and backward for N seconds. To ensure that it can hook onto the filter plate handles during forward movement and disengage during backward movement, the time setting exceeds the actual required time by 2-3 seconds, causing the plate-pulling trolley to exert excessive pressure on the filter plate handles, which can easily damage them. 3. One-sided disengagement is prone to occur during plate pulling, causing the filter plate to shift. In severe cases, the filter plate may fall off the frame, causing an accident. 4. When the plate-pulling trolley is combined with the flushing trolley for plate pulling and flushing, if one-sided disengagement occurs, the flushing rod is very likely to impact the shifted filter plate during downward movement, causing damage to the flushing mechanism or the filter plate itself. Summary of the Invention
[0004] The purpose of this application is to provide a method and device for positioning and sensing filter plates and plate pulling trolleys in a plate and frame filter press, which can accurately position the filter plates and prevent the filter plates from shifting during the pressing or pulling process.
[0005] This application is implemented as follows:
[0006] This application provides a positioning sensing method for filter plates and a plate pulling trolley in a plate and frame filter press, comprising the following steps: using multiple pairs of first wireless sensing devices respectively located on the crossbeams on both sides of the plate and frame filter press to detect sensing elements respectively located at both ends of the filter plates in the plate and frame filter press:
[0007] When the first wireless sensing device on both sides of the plate and frame filter press detects that the sensing elements at both ends of the same filter plate are out of sync, it determines that the filter plate has shifted and issues a warning alarm.
[0008] After the filter plates of the plate and frame filter press are pressed together, the first wireless sensing device on the crossbeams on both sides of the plate and frame filter press detects that the sensing element at both ends of each filter plate in the preset area is missing a signal or the sensing element number is inconsistent, and then determines that the filter plate is misaligned and issues a prompt alarm.
[0009] In some alternative implementations, the step further includes: using at least one pair of second wireless sensing devices, respectively mounted on plate-pulling trolleys on both sides of the plate and frame filter press, to detect sensing elements located at both ends of the filter plates of the plate and frame filter press.
[0010] When the plate-pulling trolley moves forward, the second wireless sensing device reads the sensing elements at both ends of the filter plate to be pulled, which is considered as the hook plate being in place and the plate returning to its original position.
[0011] When the pull plate trolley moves backward, the second wireless sensing device reads the sensing elements at both ends of the rear filter plate and is considered to have disengaged and moved into position to advance the hook plate.
[0012] When the pull plate trolley reads the sensing elements at both ends of the rear filter plate during its forward movement, it is considered that the unhooking has failed and an alarm is issued.
[0013] When the plate-pulling trolley detects the disappearance of the sensing element at one end of the pulled filter plate during its reversal, it is considered that the plate has disengaged and the filter plate has shifted, triggering an alarm.
[0014] In some alternative implementations, when using a second wireless sensing device on a plate-pulling trolley located on the crossbeams on both sides of the plate and frame filter press to detect the sensing elements located at both ends of the filter plates of the plate and frame filter press, the allowable deviation time T is T = 0.05V, where V is the running speed of the plate-pulling trolley.
[0015] In some alternative implementations, the logarithm of the first wireless sensing device is N = X / Lδ, where L is the backward stroke of the main pusher plate, δ is the thickness of the filter plate, X is the total number of filter plates, and N is rounded up.
[0016] This application also provides a positioning sensing device for filter plates and plate pulling trolleys of a plate and frame filter press, which includes two oppositely arranged crossbeams, multiple filter plates arranged parallel between the two crossbeams, and two plate pulling trolleys. The two plate pulling trolleys are configured to reciprocate along the two crossbeams to sequentially pull each filter plate along the crossbeams. It also includes multiple pairs of first wireless sensing devices respectively disposed on the two crossbeams and sensing elements respectively disposed at both ends of each filter plate.
[0017] In some alternative implementations, at least one pair of second wireless sensing devices are also included, each mounted on one of the two pull-out carts.
[0018] The beneficial effects of this application are as follows: The positioning and sensing method for filter plates and plate pulling trolleys in a plate and frame filter press provided by this application includes the following steps: using multiple pairs of first wireless sensing devices respectively installed on the crossbeams on both sides of the plate and frame filter press to detect the sensing elements respectively installed at both ends of the filter plates in the plate and frame filter press; when the first wireless sensing devices on the crossbeams on both sides of the plate and frame filter press detect that the sensing elements at both ends of the same filter plate are not synchronized, it is determined that the filter plate has shifted and an alarm is issued; after each filter plate of the plate and frame filter press is pressed, when the first wireless sensing devices on the crossbeams on both sides of the plate and frame filter press detect that the sensing elements at both ends of each filter plate in the preset area have missing signals or inconsistent sensing element numbers, it is determined that the filter plate is misaligned and an alarm is issued. The positioning and sensing method and device for filter plates and plate pulling trolleys in a plate and frame filter press provided by this application can achieve accurate positioning of the filter plates and avoid shifting of the filter plates during the pressing or pulling process. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the positioning and sensing device for the filter plate and the plate pulling trolley of the plate and frame filter press provided in the embodiments of this application.
[0021] In the diagram: 100, crossbeam; 110, filter plate; 120, plate pulling trolley; 130, first wireless sensing device; 140, sensing element; 150, second wireless sensing device. Detailed Implementation
[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0025] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application 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 on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0026] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0029] The following describes in further detail the features and performance of the plate and frame filter press filter plate and plate pulling trolley positioning sensing method and device of this application with reference to embodiments.
[0030] like Figure 1As shown in the figure, this application embodiment provides a positioning sensing device for filter plates and plate pulling trolleys of a plate and frame filter press, which includes two oppositely arranged crossbeams 100, filter plates 110 parallel to each other and spaced apart between the two crossbeams 100, and two plate pulling trolleys 120. The two plate pulling trolleys 120 can reciprocate along the two crossbeams 100 to pull each filter plate 110 along the crossbeams 100 in sequence. Five pairs of first wireless sensing devices 130 are respectively provided on the two crossbeams 100 and spaced apart along their length direction. A pair of sensing elements 140 are respectively provided at both ends of each filter plate 110. Two pairs of second wireless sensing devices 150 are respectively provided on the two plate pulling trolleys 120.
[0031] This application also provides a method for positioning and sensing filter plates and plate pulling trolleys in a plate and frame filter press, which is implemented using the aforementioned positioning and sensing device for filter plates and plate pulling trolleys in a plate and frame filter press, and includes the following steps:
[0032] When two trolleys 120 move back and forth along two crossbeams 100 to sequentially pull each filter plate 110 along the crossbeams 100, five pairs of first wireless sensing devices 130, each located on one side of the plate and frame filter press, detect the sensing elements 140 located at both ends of the filter plate 110. When the first wireless sensing devices 130 on both sides of the plate and frame filter press detect the sensing elements at both ends of the same filter plate 110 at different times, it is determined that the filter plate 110 has shifted and an alert is issued. The detection logic is shown in Table 1. After each filter plate 110 of the plate and frame filter press is pressed, the five pairs of first wireless sensing devices 130 on the crossbeams 100 on both sides of the plate and frame filter press are used to detect the missing signal of the sensing element at both ends of each filter plate 110 in the preset area or the inconsistent number of the sensing element. If the filter plate 110 is misaligned and there is a possibility of leakage, and the missing signal of the sensing element or the inconsistent number of the sensing element is still present after the filter plate 110 is pulled open and pressed and adjusted again, an alarm is issued. The detection logic is shown in Tables 2 and 3.
[0033] Table 1. Detection logic of the first wireless sensing device for sensing elements when the filter plate moves.
[0034]
[0035]
[0036] Table 2 shows the detection logic of the first wireless sensing device for the sensing element when the filter plate is pressed.
[0037]
[0038] Table 3 shows the detection logic of the first wireless sensing device for the sensing element when the filter plate is pulled open and repeatedly pressed.
[0039]
[0040] The logarithm N of the first wireless sensing device 130 is calculated using the following formula: N = X / Lδ, where L is the backward stroke of the main push plate, δ is the thickness of the filter plate 110, X is the total number of filter plates 110, and N is rounded up.
[0041] The positioning and sensing method for filter plates and plate pulling trolleys of the plate and frame filter press provided in this application further includes the following steps: using two pairs of second wireless sensing devices 150 respectively installed on the plate pulling trolleys 120 on both sides of the plate and frame filter press to detect the sensing elements 140 respectively installed at both ends of the filter plates 110 of the plate and frame filter press.
[0042] When the plate-pulling trolley 120 moves forward, the second wireless sensing device 150 reads the sensing elements 140 at both ends of the filter plate 110 to be pulled, and considers the hook plate to be in place, and immediately returns to pull the plate. The detection logic is shown in Table 4.
[0043] When the pull plate trolley 120 moves backward, the second wireless sensing device 150 reads the sensing elements 140 at both ends of the filter plate 110 behind it, and considers it to be in the disengagement position. It then immediately moves forward to hook the plate. The detection logic is shown in Table 5.
[0044] When the pull plate trolley 120 reads the sensing elements 140 at both ends of the rear filter plate 110 during its forward movement, it is considered that the unhooking is unsuccessful, the machine stops and issues a prompt alarm. The detection logic is shown in Table 6.
[0045] When the plate-pulling trolley 120 detects the disappearance of the sensing element 140 at one end of the pulled filter plate 110 during the reversing process, it is considered that the plate has been unhooked and that the filter plate 110 has shifted. The machine will stop and issue a prompt alarm. The detection logic is shown in Table 7.
[0046] When the second wireless sensing device 150 on the plate pulling trolley 120, which is respectively located on the crossbeams 100 on both sides of the plate and frame filter press, detects the sensing elements 140 located at both ends of the filter plates 110 of the plate and frame filter press, the allowable deviation time T is T = 0.05V, where V is the running speed of the plate pulling trolley 120.
[0047] Table 4 shows the detection logic of the second wireless sensing device for the sensing element when the pull-plate trolley moves forward.
[0048]
[0049]
[0050] Table 5. Detection logic of the second wireless sensing device for sensing elements when the pull-plate trolley moves backward into position.
[0051]
[0052] Table 6. Detection Logic of the Second Wireless Sensor Element When the Pull-out Cart Fails to Unhook
[0053]
[0054]
[0055] Table 7. Detection Logic of the Second Wireless Sensor Element When the Pull-Plate Cart Reverses and Unhooks Table 7. Detection Logic of the Sensor Element by the Second Wireless Sensor Device When the Pull-Plate Cart Reverses and Unhooks
[0056] The positioning sensing method and device for filter plates and plate pulling carriages of plate and frame filter presses provided in this application embodiment can achieve accurate positioning of filter plates and plate pulling carriages of plate and frame filter presses, prevent problems such as leakage and equipment damage caused by untimely detection of displacement and disengagement, and improve the intelligent operation level of filter presses.
[0057] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
Claims
1. A positioning sensing method for sensing filter plates and a plate pulling trolley in a plate and frame filter press, characterized in that, Includes the following steps: Multiple pairs of first wireless sensing devices, each located on a crossbeam on both sides of the plate and frame filter press, are used to detect sensing elements located at both ends of the filter plates of the plate and frame filter press. The number of pairs of the first wireless sensing devices is N = X / Lδ, where L is the backward stroke of the main push plate, δ is the thickness of the filter plate, X is the total number of filter plates, and N is rounded up. When the first wireless sensing device on the crossbeams on both sides of the plate and frame filter press detects that the sensing elements at both ends of the same filter plate are out of sync, it determines that the filter plate has shifted and issues a warning alarm. When each of the filter plates of the plate and frame filter press is pressed together, the first wireless sensing device on the crossbeams on both sides of the plate and frame filter press detects that the sensing element at both ends of each filter plate in the preset area is missing or that the sensing element number is inconsistent, and then determines that the filter plate is misaligned and issues a prompt alarm.
2. The positioning and sensing method according to claim 1, characterized in that, The method also includes the following step: using at least one pair of second wireless sensing devices respectively located on the plate-pulling trolleys on both sides of the plate and frame filter press to detect the sensing elements respectively located at both ends of the filter plates of the plate and frame filter press. When the plate-pulling trolley moves forward, the second wireless sensing device reads the sensing elements at both ends of the filter plate to be pulled, and considers it as the hook plate being in place and returning to pull the plate. When the pull plate trolley moves backward, the second wireless sensing device reads the sensing elements at both ends of the filter plate behind it, which is considered as the hook plate being disengaged and moving forward. When the plate-pulling trolley reads the sensing elements at both ends of the filter plate behind it during its forward movement, it is considered that the unhooking has failed and an alarm is issued. When the plate-pulling trolley detects the disappearance of the sensing element at one end of the filter plate during its reversal, it is considered that the plate has disengaged and that the filter plate has shifted, triggering an alarm.
3. The positioning and sensing method according to claim 2, characterized in that, When the second wireless sensing device on the plate-pulling trolley, which is located on the crossbeams on both sides of the plate and frame filter press, detects the sensing elements located at both ends of the filter plates of the plate and frame filter press, the allowable deviation time T is T=0.05V, where V is the running speed of the plate-pulling trolley.
4. A positioning sensing device for implementing the positioning sensing method as described in any one of claims 1-3, for sensing filter plates and plate-pulling trolleys of a plate and frame filter press, comprising two opposing crossbeams, a plurality of filter plates arranged parallel between the two crossbeams, and two plate-pulling trolleys, wherein the two plate-pulling trolleys are configured to reciprocate along the two crossbeams to sequentially pull each of the filter plates along the crossbeams, characterized in that... It also includes multiple pairs of first wireless sensing devices respectively located on the two crossbeams and sensing elements respectively located at both ends of each filter plate.
5. The positioning sensing device according to claim 4, characterized in that, It also includes at least one pair of second wireless sensing devices, each located on one of the two pull-out carts.