Vacuum filter cloth rectifying device

Abstract

The utility model belongs to mineral washing technology field, concretely is a kind of vacuum filter press filter cloth rectifying device, including filter cloth deviation detection device and servo drive rectifying device;Filter cloth deviation detection device is monitored filter cloth deviation by detecting the filter cloth covering roller set area state, and servo drive rectifying device carries out servo rectification to filter cloth operation by receiving the wireless signal of filter cloth deviation detection device, and the change of the covering area of the roller surface is sensed by detecting filter cloth to sense deviation tendency, compared with the device of traditional detection filter cloth edge, it can identify the tiny deviation in the very early stage of deviation, realize the change from "after rectification" to "prevention", the mechanical movement signal of multiple induction pressure plate is gathered as unified air pressure signal through airtight chamber, and the sensitivity is high, and the anti-interference ability is strong, provides reliable data basis for subsequent accurate control.

Description

Technical Field

[0001] This utility model relates to the field of mineral washing and beneficiation technology, specifically to a filter cloth correction device for a vacuum filter press. Background Technology

[0002] Vacuum filter presses are key solid-liquid separation equipment in mining, chemical, and environmental protection industries. The stability of the filter cloth, its core working component, directly determines production efficiency and product quality. Under the long-term influence of uneven material impact, roller installation errors, and tension variations, the filter cloth is highly susceptible to "deviation." Deviation not only leads to filter cloth wrinkles and damage, causing material leakage, but also forces the production line to stop for adjustments, severely restricting production continuity and automation levels.

[0003] Various filter cloth alignment devices exist in the prior art, but most suffer from problems such as slow response, insufficient accuracy, or complex structure. For example, prior art document 1 (publication number: CN214597611U, titled "A Filter Cloth Alignment Device for a Belt Filter Press") discloses a scheme using an electric telescopic rod and a hydraulic telescopic rod to drive the alignment frame. This device restricts the position of the filter cloth and performs alignment through a mechanical structure, but its detection method relies on physical contact after the filter cloth has already shifted significantly, resulting in a delayed alignment action. Furthermore, this mechanical structure is prone to wear under frequent operation and cannot effectively identify and prevent early trends of filter cloth deviation, thus constituting "post-mortem alignment," which carries a high risk of filter cloth damage.

[0004] For example, in comparison document 2 (publication number: CN223461221U, titled "A Fault Detection Device for a Vertical Filter Press"), a vision camera is used to detect faults such as filter cloth misalignment. This solution achieves non-contact detection, but the recognition accuracy of the vision system is easily affected by the environment when dealing with harsh working conditions such as humidity and dust. Furthermore, it does not form a tight closed loop with a high-response actuator, resulting in a slow overall correction response speed, which is difficult to meet the requirements of high-precision continuous production. Utility Model Content

[0005] This application proposes a correction device capable of early, accurate, and sensitive detection of filter cloth misalignment trends, and capable of high-precision, intelligent, and rapid response, thereby improving the stability and automation of vacuum filter press operation and addressing the aforementioned technical pain points: A filter cloth correction device for a vacuum filter press includes a filter cloth offset detection device and a servo-driven correction device. The filter cloth offset detection device monitors the filter cloth offset by detecting the set area of ​​the filter cloth covering the rotating roller. The servo-driven correction device performs servo correction on the filter cloth by receiving the wireless signal from the filter cloth offset detection device.

[0006] Preferably, the filter cloth offset detection device includes a mounting groove, a mounting base, a rotating shaft, a sensing pressure plate, an airbag seat, a sealing airbag, and a pressure sensor; the rotating roller includes a core shaft and a hollow cylindrical shell rotatably mounted on the core shaft. Several mounting grooves are provided at both ends of the rotating roller, and mounting bases are fixedly installed on the inner sidewalls of both ends of the rotating roller. Each mounting base rotates with the shell. A number of rotating shafts, equal to the number of mounting grooves, are fixedly installed on each mounting base. A sensing pressure plate is rotatably mounted on each rotating shaft, and the outer surface of each sensing pressure plate can rotate to be flush with the outer surface of the mounting groove. An annular groove-shaped airbag seat is provided on the inner end face of both sides of the rotating roller. An annular sealing airbag is fixedly installed in each airbag seat, and a pressure sensor is fixedly installed in each sealing airbag. The pressure sensor and the servo-driven correction device are wirelessly connected.

[0007] Preferably, the servo-driven correction device includes a bearing housing, a sliding bracket, a drive structure, and a hinged seat; one end of the mandrel equipped with the filter cloth offset detection device is hinged to the filter press frame via the hinged seat, the rotation plane of the hinged seat is parallel to the filter cloth travel direction, one end of the mandrel is fixedly mounted on the bearing housing, a sliding bracket is rotatably mounted on the filter press frame to allow the bearing housing to slide along the filter cloth travel direction, the filter press frame is provided with a drive structure that is poweredly connected to the bearing housing, and the drive structure is wirelessly connected to the air pressure sensor.

[0008] Preferably, the drive structure includes a servo motor and a lead screw. The servo motor is fixedly mounted on the filter press frame, and the lead screw is rotatably mounted on the output shaft of the servo motor. The end of the lead screw away from the servo motor is rotatably connected to a bearing housing.

[0009] Preferably, the filter cloth offset detection device and the servo-driven correction device are arranged in pairs on the rollers at the farthest ends of the filter press frame.

[0010] Preferably, the filter cloth offset detection device, the servo-driven correction device, and the vacuum filter press filter cloth tensioning mechanism are connected via radio signals.

[0011] Compared with the prior art, this utility model provides a filter cloth correction device for a vacuum filter press, which has the following beneficial effects: By detecting changes in the coverage area of ​​the filter cloth on the roller surface, the device senses the tendency for filter cloth to deviate. Compared to traditional devices that detect the filter cloth edge, this device can identify minute deviations at a very early stage, achieving a shift from "post-mortem correction" to "pre-mortem prevention." The device converges the mechanical motion signals from multiple sensing plates into a unified air pressure signal through a sealed air chamber. It boasts high sensitivity and strong anti-interference capabilities, providing a reliable data foundation for subsequent precise control. This effectively prevents significant filter cloth deviation and significantly reduces the risk of filter cloth wear and tear. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the filter cloth offset detection device.

[0013] In the diagram: 1. Filter press frame; 2. Filter cloth; 3. Tensioning mechanism; 4. Servo motor; 5. Rotary roller; 501. Mandrel; 502. Mounting groove; 503. Mounting base; 504. Rotating shaft; 505. Induction pressure plate; 506. Airbag seat; 507. Sealing airbag; 508. Air pressure sensor; 6. Bearing seat; 7. Sliding bracket; 8. Lead screw; 9. Fixed bracket; 10. Hinge seat. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] Example It is worth noting that this application only addresses the issue of misalignment of the rotating filter cloth 2 in a vacuum filter press, and does not elaborate on the dewatering components or the drive components of the filter cloth 2. The wired or wireless signal connections mentioned in this application are existing technologies. Furthermore, the specific coordination and related movements between components should consider the use of PLCs / microcontrollers / industrial control computers in conjunction with wired / wireless devices such as Bluetooth hardware / WIFI hardware / communication cables. For example, if A receives an X signal from B and controls C to move in the Y direction, and then C stops at the Z position or returns to the starting point, these are all known technologies.

[0016] The following is combined Figure 1 , Figure 2 and Figure 3 This application introduces a filter cloth correction device for a vacuum filter press, including a filter cloth 2 offset detection device and a servo-driven correction device. The filter cloth 2 offset detection device monitors the offset of the filter cloth 2 by detecting the set area of ​​the filter cloth 2 covering the rotating roller 5. The servo-driven correction device performs servo correction on the operation of the filter cloth 2 by receiving the wireless signal from the filter cloth 2 offset detection device.

[0017] In the early stages of deviation, the area of ​​the filter cloth 2 covering the rotating roller 5 will undergo small but continuous changes. By monitoring this physical quantity, deviation can be predicted from the trend, achieving "prevention in advance" and early fine-tuning, avoiding the occurrence of large deviations, and greatly improving the sensitivity and foresight of the detection.

[0018] The filter cloth 2 offset detection device includes a mounting groove 502, a mounting base 503, a rotating shaft 504, a sensing pressure plate 505, an airbag seat 506, a sealing airbag 507, and a pressure sensor 508. The pressure sensor 508 can be referenced from the tire pressure sensor of a car tire, and both temperature and pressure data can be monitored in real time. The rotating roller 5 includes a spindle 501 and a hollow cylindrical shell rotatably mounted on the spindle 501. Several mounting grooves 502 are opened at both ends of the rotating roller 5, and mounting bases 503 are fixedly installed on the inner sidewalls of both ends of the rotating roller 5. Each mounting base 503 follows the shell. The roller 5 rotates; each mounting base 503 is fixedly equipped with a number of rotating shafts 504 equal to the number of mounting slots 502, and each rotating shaft 504 is rotatably equipped with a sensing pressure plate 505. The outer surface of each sensing pressure plate 505 can rotate to be flush with the outer surface of the mounting slot 502. The inner end faces of both sides of the roller 5 are provided with annular groove-shaped airbag seats 506. An annular sealing airbag 507 is fixedly installed in the airbag seat 506. A pressure sensor 508 is fixedly installed in the sealing airbag 507. The pressure sensor 508 is wirelessly connected to the servo drive correction device.

[0019] When the filter cloth 2 is properly covering the area, all the sensing plates 505 are pressed flat within the mounting groove 502. When the filter cloth 2 shifts off-center, the coverage area on one side decreases, and the previously pressed-down sensing plates 505 will spring up under the action of centrifugal force and the elasticity of the sealing airbag 507. This physical movement is the first signal conversion of this device. The mechanical movements of multiple sensing plates 505 are converged into a unified pressure signal through the sealing airbag 507. The sensing plates 505 undergoing compression will compress the sealed air chamber space, causing a slight change in internal air pressure, which is the second signal conversion. This "multi-point integration" design has significant advantages: it integrates the coverage status of multiple points in the circumferential direction of the roller 5 to obtain a statistically significant average offset, which has strong resistance to single-point interference and more representative detection results. Simplifying the complex multi-point mechanical displacement detection into the monitoring of a single air pressure variable greatly simplifies the subsequent signal acquisition and processing circuit, reducing costs and failure rates. The air pressure sensor 508 is extremely sensitive to changes in internal air pressure, capable of detecting minute air pressure fluctuations caused by the movement of a single or even half of the sensing pressure plate 505, thus enabling ultra-early identification of the filter cloth 2's deviation trend. Wireless transmission solves the traditional problem of extracting sensor data from rotating components. It is worth noting that during the periodic movement of the roller 5, the air pressure value will always exhibit a periodic change similar to a sine function, but over the entire working cycle of several hours or more, its average, peak, and trough values ​​will remain essentially stable. Therefore, the deviation of the filter cloth 2 can be determined by identifying differences in typical values ​​only within a single unit of time in the cycle.

[0020] The servo-driven correction device includes a bearing seat 6, a sliding bracket 7, a drive structure, and a hinge seat 10. One end of the spindle 501, which houses the filter cloth 2 offset detection device, is hinged to the filter press frame 1 via the hinge seat 10. The rotation plane of the hinge seat 10 is parallel to the travel direction of the filter cloth 2. One end of the spindle 501 is fixedly mounted on the bearing seat 6. The filter press frame 1 is rotatably mounted with a sliding bracket 7 that allows the bearing seat 6 to slide along the travel direction of the filter cloth 2. The filter press frame 1 is equipped with a drive structure that is electrically connected to the bearing seat 6. The drive structure is wirelessly connected to the air pressure sensor 508. The "one-end hinged, one-end sliding drive" mechanism is key to this solution. The hinge seat 10 provides a stable and reliable rotation fulcrum, ensuring the determinacy and repeatability of the correction roller's trajectory during adjustment. The sliding bracket 7 allows the bearing seat 6 to slide freely in the travel direction of the filter cloth 2, converting the rotational motion of the servo motor 4 into the linear forward and backward movement of the other end of the correction roller. This movement causes the axis of the correction roller to form a small angle with the direction of travel of the filter cloth 2. According to the "running-in" principle in belt drive, this angle will generate a lateral force that continuously guides the misaligned filter cloth 2 back to the correct position.

[0021] The drive structure includes a servo motor 4 and a lead screw 8. The servo motor 4 is fixedly mounted on the filter press frame 1, and the lead screw 8 is rotatably mounted on the output shaft of the servo motor 4. The end of the lead screw 8 away from the servo motor 4 is rotatably connected to a bearing seat 6. A fixed bracket 9 is provided on the filter press frame 1 to support the lead screw 8 and to adjust the smoothness of its operation. The servo motor 4 itself is a closed-loop control element, and its speed, angle, and torque can be precisely controlled. This allows it to perfectly execute complex commands issued by the control system, such as rapid start-up, uniform feed, precise positioning, and smooth stopping. The lead screw 8 converts the rotational motion of the motor into high-precision linear displacement, which has advantages such as high transmission efficiency, high positioning accuracy, high axial rigidity, and good self-locking (eliminating the need for a braking device).

[0022] The filter cloth 2 offset detection device and the servo-driven correction device are arranged in pairs on the rollers 5 at the farthest ends of the filter press frame 1. The two correction points can work together. The control system can be programmed to achieve linkage. For example, after a large-scale correction is performed at the inlet end, the outlet end can be notified in advance to prepare or to make compensatory adjustments, making the correction strategy more intelligent and systematic. Third, this layout can effectively deal with more complex deviation conditions, such as the "S-shaped" twist of the filter cloth 2 itself. A single correction point cannot solve this problem, but the coordinated adjustment of the two points at the beginning and end can effectively "straighten" it.

[0023] For further implementation methods, refer to Figure 2 The filter cloth 2 offset detection device, servo-driven correction device, and vacuum filter press filter cloth tensioning mechanism 3 are connected via radio signal. Before the correction operation of this application is initiated, the vacuum filter press filter cloth tensioning mechanism 3 can be relaxed to reduce the tension on the filter cloth 2 and protect its service life.

[0024] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A filter cloth correction device for a vacuum filter press, characterized in that: It includes a filter cloth (2) offset detection device and a servo drive correction device; the filter cloth (2) offset detection device monitors the offset of the filter cloth (2) by detecting the set area status of the filter cloth (2) covering the rotating roller (5); the servo drive correction device performs servo correction on the operation of the filter cloth (2) by receiving the wireless signal from the filter cloth (2) offset detection device.

2. The filter cloth correction device for a vacuum filter press according to claim 1, characterized in that: The filter cloth (2) offset detection device includes a mounting groove (502), a mounting base (503), a rotating shaft (504), a sensing pressure plate (505), an airbag seat (506), a sealing airbag (507), and a pressure sensor (508); the rotating roller (5) includes a spindle (501) and a hollow cylindrical shell rotatably mounted on the spindle (501). Several mounting grooves (502) are provided at both ends of the rotating roller (5), and mounting bases (503) are fixedly installed on the inner walls of both ends of the rotating roller (5). Each mounting base (503) rotates with the shell; each mounting base (503)... The roller (5) is fixedly mounted with a number of rotating shafts (504) equal to the number of mounting slots (502). Each rotating shaft (504) is rotatably mounted with a sensing pressure plate (505). The outer surface of each sensing pressure plate (505) can be rotated to be flush with the outer surface of the mounting slot (502). The inner end faces of both sides of the roller (5) are provided with annular groove-shaped airbag seats (506). An annular sealing airbag (507) is fixedly mounted in the airbag seat (506). A pressure sensor (508) is fixedly mounted in the sealing airbag (507). The pressure sensor (508) is wirelessly connected to the servo drive correction device.

3. The filter cloth correction device for a vacuum filter press according to claim 2, characterized in that: The servo-driven correction device includes a bearing seat (6), a sliding bracket (7), a drive structure, and a hinge seat (10). One end of the spindle (501) equipped with the filter cloth (2) offset detection device is hinged to the filter press frame (1) via the hinge seat (10). The rotation plane of the hinge seat (10) is parallel to the travel direction of the filter cloth (2). One end of the spindle (501) is fixedly installed on the bearing seat (6). The filter press frame (1) is rotatably equipped with a sliding bracket (7) that allows the bearing seat (6) to slide along the travel direction of the filter cloth (2). The filter press frame (1) is provided with a drive structure that is poweredly connected to the bearing seat (6). The drive structure is connected to the air pressure sensor (508) via radio signal.

4. The filter cloth correction device for a vacuum filter press according to claim 3, characterized in that: The drive structure includes a servo motor (4) and a lead screw (8). The servo motor (4) is fixedly mounted on the filter press frame (1). The lead screw (8) is rotatably mounted on the output shaft of the servo motor (4). The end of the lead screw (8) away from the servo motor (4) is rotatably connected to the bearing seat (6).

5. The filter cloth correction device for a vacuum filter press according to claim 4, characterized in that: The filter cloth (2) offset detection device and the servo drive correction device are arranged in pairs on the rollers (5) at the farthest ends of the filter press frame (1).

6. The filter cloth correction device for a vacuum filter press according to claim 4, characterized in that: The filter cloth (2) offset detection device, the servo drive correction device, and the vacuum filter press filter cloth tensioning mechanism (3) are connected by radio signals.

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