Indirect monitoring device for failure of pressure plate oil cylinder piston oil seal and corresponding filter plate clamping mechanism

Abstract

The key points of the innovative solution of the indirect monitoring device for failure of the piston oil seal of the pressure plate cylinder and the corresponding filter plate clamping mechanism of the present invention are: adding an indirect monitoring device for failure of the piston oil seal of the pressure plate cylinder, including a sensor mounting plate, a loose plate sensor, and a loose plate sensing plate; the loose plate sensing plate is installed on the lower side of the pressure plate and can move with the pressure plate; when the pressure plate cylinder is pressing the filter plate, the loose plate sensor is fixedly installed on the main beam of the frame outside the sensing area and critically close to the right side of the loose plate sensing plate, and is connected to the PLC program control system, which can monitor the abnormal loosening of the pressure plate online to indirectly judge the failure of the piston oil seal, and control the shutdown in time to prevent the filter chamber from spraying. The filter plate clamping mechanism, using this monitoring device, solves the technical problems that when the pressure plate cylinder presses the filter plate and maintains pressure for the filter chamber, the piston oil seal wears out of tolerance and leaks internally, which cannot be seen, cannot be directly monitored online and handled in time, and the cylinder gradually reduces pressure and the filter plate gradually loosens, which is difficult to detect in time, and the emergency shutdown is not performed until the filter chamber sprays; it expands energy and increases efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic diaphragm filter press (patent classification number B01D25 / 12), and relates to a failure monitoring device for a pressure plate cylinder piston oil seal (sealing ring) of a filter plate pressing and pressure maintaining mechanism. Background Art

[0002] A filter press is a pressurized filtration equipment with multiple filter chambers that operates intermittently; a diaphragm filter press is a filter press that performs low-pressure static filtration in the primary stage and high-pressure expansion of the diaphragm to squeeze the filter cake for dehydration in the secondary stage; an automatic diaphragm filter press is a diaphragm filter press that integrates mechanics, electricity, and fluids and is intelligently controlled by PLC; it is mainly composed of a double-beam frame, a filter plate clamping mechanism, a squeezing and filtration mechanism, a plate pulling and cake unloading mechanism, a filter cloth cleaning mechanism, a flap plate liquid receiving mechanism, and a PLC program control system; it is suitable for solid-liquid separation of various suspended liquid materials (i.e., a mixture of liquid and solid particles) with low requirements for filter cake moisture content (moisture content of about 25%).

[0003] The filter plate clamping mechanism, that is, the filter plate clamping and pressure-maintaining mechanism, is mainly composed of a hydraulic station, a pressure plate cylinder, a hydraulic oil pipe, and a clamping stroke limit device; the structural components of the hydraulic station include: a motor, an oil pump, a relief valve (pressure adjustment) reversing valve, a pressure gauge, an oil circuit, and an oil tank; the pressure plate cylinder is mainly composed of a cylinder barrel, a cylinder head, a piston rod, a piston, a guide sleeve, a piston rod oil seal, a piston oil seal, and a buffer device; the piston rod oil seal and the piston oil seal are wearing parts, and if they are worn excessively (seal failure), external leakage and internal leakage will occur respectively, and the external leakage is visible, but the internal leakage is invisible; the cylinder barrel of the pressure plate cylinder is installed on the tailstock of the frame, and the cylinder piston rod is connected to the clamping plate, which has the function of automatically compressing the filter plate to form a filter chamber and maintaining pressure for the filter chamber.

[0004] The squeezing and filtering mechanism is the core mechanism of the diaphragm filter press, which is mainly composed of filter plate guides, head and tail anti-corrosion filter plates, diaphragm filter plates, matching filter plates, filter cloths, cloth-clamped distributors, filter plate support handles, high-pressure medium main pipes, high-pressure medium hoses, sealing rings at the ends of each fluid inlet and outlet hole, and each fluid inlet and outlet external pipes; the filter plate is pressed by the pressing plate cylinder of the filter plate pressing mechanism, and multiple diaphragm filter plates, filter cloths and the recesses (cavities) of the matching filter plates arranged alternately constitute multiple squeezing filter chambers; multiple squeezing filter chambers plus head and tail anti-corrosion filter plates and various pipelines constitute a squeezing and filtering mechanism, which has the function of high-pressure filtering materials.

[0005] The existing filter plate clamping mechanism has the following defects: there is a lack of online monitoring and control device for excessive wear of the pressure plate cylinder piston oil seal (seal failure), because the piston oil seal is a wearing part and is installed in the cylinder barrel of the pressure plate cylinder. The excessive wear and leakage of the piston oil seal is invisible and cannot be directly monitored online; when the pressure plate cylinder presses the filter plate and maintains pressure for the filter chamber, the piston end (rodless chamber) of the cylinder barrel is filled with hydraulic oil. If the piston oil seal wears excessively and causes internal leakage, the cylinder clamping force will be reduced; when the cylinder clamping force drops to less than the filter chamber squeezing force, the piston rod is forced to gradually shrink and the filter plate gradually loosens, which is difficult for the human eye to detect in time until the filter chamber sprays (high-pressure material sprays out from the gap between adjacent filter plates) and the machine is shut down in an emergency, resulting in material waste, pollution of the on-site environment, and the spraying of corrosive materials and safety hazards; online monitoring of piston oil seal failure is a technical problem that people have always been eager to solve but have never been successful. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects of the existing filter plate clamping mechanism, to solve the technical problems that in the process of the pressure plate cylinder pressing the filter plate and maintaining the pressure for the filter chamber, the piston oil seal wears out of tolerance and the internal leakage is invisible, cannot be directly monitored online and handled in time, the cylinder gradually reduces the pressure and the filter plate gradually loosens, which is difficult to detect in time, and the emergency shutdown is not performed until the filter chamber is sprayed with material. Provide a pressure plate cylinder piston oil seal failure indirect monitoring device and a corresponding filter plate clamping mechanism; the corresponding filter plate clamping mechanism refers to the filter plate clamping and pressure maintaining mechanism with the pressure plate cylinder piston oil seal failure indirect monitoring device of the present invention, which is abbreviated due to the limited number of words in the patent name.

[0007] The new technical solution adopted by the present invention to solve the problems of the prior art is: an indirect monitoring device for failure of a pressure plate cylinder piston oil seal (hereinafter referred to as: a piston oil seal failure monitoring device). The key points of the overall technical solution are that the innovative overall structure has outstanding substantial characteristics compared with the prior art in that: on the basis of the existing filter plate clamping mechanism, an indirect monitoring device for failure of a pressure plate cylinder piston oil seal is added, including a sensor mounting plate, a loose plate sensor, and a loose plate sensing plate; the loose plate sensing plate, that is, the loosening sensing point of the oil seal failure filter plate, is installed on the lower side of the clamping plate and can move with the clamping plate; the loose plate sensor, that is, the loosening sensor of the oil seal failure filter plate, is installed on the lower side of the clamping plate The loose plate sensor is fixedly installed on the main beam of the frame on the right side of the loose plate sensor plate outside the sensing area and is connected to the PLC program control system. When the oil seal fails and the filter plate tightening plate is abnormally loose, the loose plate sensor plate moves with the filter plate clamping plate and approaches the loose plate sensor. The loose plate sensor immediately transmits the loose filter plate clamping plate information to the PLC program control system, and the PLC program control system controls the shutdown in time to avoid material spraying from the filter chamber. Thus, the technical problem that in the process of the pressure plate cylinder clamping the filter plate and maintaining pressure for the filter chamber, the piston oil seal wears out of tolerance and the internal leakage is invisible, and cannot be directly monitored and dealt with online in time, and the cylinder gradually reduces pressure and the filter plate gradually loosens, which is difficult to detect in time, and the emergency shutdown is performed until the filter chamber is sprayed.

[0008] The specific design scheme of the present invention is: (1) the sensor mounting plate is a T-shaped stainless steel mounting plate, with a horizontal mounting plate adjustment hole at the upper end and a vertically adjustable sensor mounting hole at the lower end; (2) the loose plate sensor, that is, the piston oil seal failure filter plate abnormal looseness sensor, is a NBN12-18GM50-E2 type proximity sensor; (3) the loose plate sensing plate, that is, the piston oil seal failure filter plate abnormal looseness sensing point, is an N-shaped stainless steel bent plate with a width of 8 cm and a double mounting hole on one side.

[0009] The connection relationship of the main parts of the present invention is: for the convenience of explanation, the clamping plate and the frame main beam closely related to the piston oil seal failure monitoring device are added; (1) Installation of the loose plate sensor plate: The loose plate sensor plate is installed on the lower side of the filter plate clamping plate and can move with the filter plate clamping plate; (2) Assembly of the sensor body: When the pressure plate oil cylinder presses the filter plate, the sensor mounting plate is fixedly installed on the frame main beam outside the sensing area and close to the right side of the loose plate sensor plate. The loose plate sensor is mounted on the sensor mounting plate and connected to the PLC program control system. Through two-dimensional adjustment of the mounting plate adjustment hole and the sensor mounting hole, the loose plate sensor dynamically corresponds to the loose plate sensing plate (the normal time monitoring device is closed); (3) Dynamic relationship of the piston oil seal failure monitoring device: when the piston oil seal fails and the filter plate clamping plate is abnormally loose, the loose plate sensing plate moves to the right (towards the tail end of the machine) with the filter plate clamping plate and approaches the loose plate sensor (the monitoring device is turned on when abnormal), and the loose plate sensor immediately transmits the abnormal looseness information of the filter plate clamping plate to the PLC program control system online, and the PLC program control system promptly controls the shutdown to prevent the filter chamber from spraying.

[0010] Principle and process of indirect monitoring of piston oil seal failure: (1) Chain reaction of piston oil seal failure: When the pressure plate cylinder presses the filter plate and maintains pressure for the filter chamber, the piston end of the cylinder is filled with hydraulic oil. If the piston oil seal wears excessively and causes internal leakage, the cylinder clamping force will be reduced; when the cylinder clamping force drops to less than the filter chamber squeezing force, the piston rod is forced to gradually contract, and the filter plate clamping plate and the complete set of filter plates gradually loosen abnormally; (2) Indirect judgment of oil seal failure by monitoring abnormal loosening of the filter plate: When the filter plate clamping plate is abnormally loose, the loose plate sensor plate moves to the right (towards the tail end of the machine) with the filter plate clamping plate and approaches the loose plate sensor. The loose plate sensor transmits the loose filter plate clamping plate (i.e. oil seal failure) information to the PLC control system online in real time. The PLC control system promptly controls the shutdown (stops feeding or closes the high-pressure medium valve) to avoid material spraying from the filter chamber.

[0011] The present invention also provides a filter plate clamping mechanism, namely, a filter plate clamping and pressure-maintaining mechanism, which uses the indirect monitoring device for failure of the pressure plate cylinder piston oil seal provided by the present invention; the filter plate clamping mechanism is mainly composed of a hydraulic station, a pressure plate cylinder, a hydraulic oil pipe, a clamping stroke limit device, and a piston oil seal failure monitoring device; the hydraulic station includes a motor, an oil pump, an oil tank, and a hydraulic integrated valve group; the pressure plate cylinder includes a cylinder barrel, a cylinder head, a piston rod, a piston, a guide sleeve, a piston rod oil seal, a piston oil seal, and a buffer device; the cylinder barrel of the pressure plate cylinder is installed on the tailstock of the frame, and the cylinder piston rod is connected to the filter plate clamping plate, which has the function of automatically clamping multiple filter plates to form multiple squeezing filter chambers and maintaining pressure for the squeezing filter chambers.

[0012] The indirect monitoring device for failure of the pressure plate cylinder piston oil seal and the corresponding filter plate clamping mechanism provided by the present invention have the advantages of online indirect monitoring of the piston oil seal, timely handling of oil seal failure, reliable performance and easy use; its beneficial effect is that by adding an indirect monitoring device for failure of the pressure plate cylinder piston oil seal, abnormal looseness of the filter plate clamping plate can be monitored online to indirectly judge the failure of the piston oil seal, and timely control the shutdown to prevent the filter chamber from spraying; the automatic monitoring performance of the filter plate clamping mechanism is improved, and the technical problem of online monitoring of piston oil seal failure that people have been eager to solve but have never succeeded in solving is solved, the material waste and environmental pollution caused by filter chamber spraying are eliminated, the safety hazards of corrosive material spraying are eliminated, and the safety and environmental protection performance of the filter press is improved; energy is expanded and efficiency is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view schematic diagram of the indirect monitoring device for failure of the pressure plate cylinder piston oil seal of the present invention.

[0014] Figure 2 It is a side schematic diagram of the indirect monitoring device for failure of the pressure plate cylinder piston oil seal of the present invention.

[0015] Figure 3 It is a schematic diagram of the sensor mounting plate of the indirect monitoring device for failure of the pressure plate cylinder piston oil seal of the present invention.

[0016] Figure 4 It is a schematic diagram of the pressure plate oil cylinder and its piston oil seal of the filter plate pressing mechanism of the present invention.

[0017] Figure 5 It is a schematic diagram of the assembly of the filter plate pressing mechanism of the present invention and the corresponding automatic diaphragm filter press.

[0018] Figure markings: 1-sensor mounting plate, 2-loose plate sensor, 3-loose plate sensing plate, 4-mounting plate adjustment hole, 5-sensor mounting hole, 6-piston rod, 7-piston oil seal, 8-cylinder barrel, 9-pressure plate cylinder piston oil seal failure indirect monitoring device (abbreviated as: piston oil seal failure monitoring device or the present invention), 10-pressure plate cylinder, 11-filter plate clamping plate (abbreviated as: clamping plate), 12-frame main beam, 13-high-pressure medium main pipe, 14-matching filter plate, 15-diaphragm filter plate, 16-complete filter plate (abbreviated as: filter plate), 17-high-pressure medium valve, 18-PLC program control system (including PLC program control cabinet). DETAILED DESCRIPTION

[0019] The technical scheme in the embodiments of the present invention is described below in conjunction with the drawings of the embodiments of the indirect monitoring device for the failure of the pressure plate oil cylinder piston oil seal and the corresponding filter plate clamping mechanism of the present invention. The described embodiments are only a part of the preferred embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments without creativity made by those skilled in the art, such as the indirect monitoring device for the failure of the pressure plate oil cylinder piston oil seal with the same indirect monitoring method for the failure of the piston oil seal and similar structure, all belong to the protection scope of the present invention.

[0020] Example 1

[0021] An indirect monitoring device for failure of a pressure plate oil cylinder piston oil seal (abbreviated as: piston oil seal failure monitoring device), the main points of the innovative overall implementation plan are: on the basis of the existing filter plate clamping mechanism, an additional indirect monitoring device for failure of a pressure plate oil cylinder piston oil seal is provided, comprising a sensor mounting plate 1, a loose plate sensor 2, and a loose plate sensing plate 3; the loose plate sensing plate 3, i.e., the sensing point for abnormal looseness of the oil seal failure filter plate, is installed on the lower side of the filter plate clamping plate 11 and can move with the filter plate clamping plate 11; the loose plate sensor 2, i.e., the looseness sensor for ... The cylinder 10 presses the filter plate 16, the loose plate sensor 2 is fixedly installed on the frame main beam 12 outside the sensing area and critically close to the right side of the loose plate sensor plate 3, and is connected to the PLC program control system 18. When the piston oil seal 7 fails and the filter plate clamping plate 11 is abnormally loose, the loose plate sensor plate 3 moves with the filter plate clamping plate 11 and approaches the loose plate sensor 2. The loose plate sensor 2 immediately transmits the abnormal looseness information of the filter plate clamping plate 11 to the PLC program control system 18, and the PLC program control system 18 controls the shutdown in time to avoid material spraying from the filter chamber. The specific implementation plan is described in detail as follows.

[0022] The sensor mounting plate 1 is a T-shaped stainless steel mounting plate, with a horizontal mounting plate adjustment hole 4 at the upper end and a vertically adjustable sensor mounting hole 5 at the lower end; when the pressure plate cylinder 10 presses the filter plate 16, the sensor mounting plate 1 is fixedly installed on the frame main beam 12 outside the sensing area and critically close to the right side of the loose plate sensing plate 3; it is used to install the loose plate sensor 2.

[0023] The loose plate sensor 2, i.e., the sensor for abnormal looseness of the filter plate 16 when the piston oil seal 7 fails, is a NBN12-18GM50-E2 type proximity sensor; the loose plate sensor 2 is mounted on the sensor mounting plate 1 and connected to the PLC program control system 18, and the loose plate sensor 2 is dynamically adjusted to the loose plate sensing plate 3 (the monitoring device is closed under normal conditions) through two-dimensional adjustment of the mounting plate adjustment hole 4 and the sensor mounting hole 5; the loose plate sensor 2 can transmit the abnormal looseness information of the filter plate clamping plate 11 to the PLC program control system 18 online and in real time; it is used for online direct monitoring and instant transmission of abnormal looseness of the filter plate clamping plate 11, and indirectly judging the failure information of the piston oil seal 7.

[0024] The loose plate sensing plate 3, i.e., the sensing point of abnormal looseness of the filter plate 16 when the piston oil seal 7 fails, is an n-shaped stainless steel bent plate with a width of 8 cm and a double mounting hole on one side; the loose plate sensing plate 3 is installed on the lower side of the filter plate clamping plate 11 and can move with the filter plate clamping plate 11; it is used as an equivalent sensing point for abnormal looseness of the filter plate clamping plate 11 (i.e., failure of the piston oil seal 7).

[0025] Dynamic relationship of the piston oil seal failure monitoring device: when the piston oil seal 7 fails and the filter plate clamping plate 11 is abnormally loose, the loose plate sensing plate 3 moves to the right (towards the tail end of the machine) with the filter plate clamping plate 11 and approaches the loose plate sensor 2 (the monitoring device is turned on when abnormal), and the loose plate sensor 2 transmits the abnormal looseness information of the filter plate clamping plate 11 to the PLC program control system 18 online in real time, and the PLC program control system 18 controls the shutdown in time to avoid material spraying from the filter chamber.

[0026] The indirect monitoring device 9 for failure of the pressure plate cylinder piston oil seal provided by the present invention has the advantages of online indirect monitoring of the piston oil seal 7, timely handling of oil seal failure, reliable performance and easy use; it solves the technical problems that when the pressure plate cylinder 10 presses the filter plate 16 and maintains pressure for the filter chamber, the piston oil seal 7 wears out of tolerance and the internal leakage is invisible, and cannot be directly monitored and handled online in time, and the pressure of the pressure plate cylinder 10 gradually decreases and the filter plate 16 gradually loosens, which is difficult to detect in time, and the emergency shutdown is not required until the filter chamber is sprayed; it eliminates the material waste and environmental pollution caused by the spraying of the filter chamber, eliminates the safety hazards of the spraying of corrosive materials, and improves the safety and environmental protection performance of the filter press; it expands energy and increases efficiency.

[0027] Example 2

[0028] A filter plate pressing mechanism, i.e., a filter plate pressing and pressure-maintaining mechanism, uses the indirect monitoring device 9 for failure of the pressing plate oil cylinder piston oil seal (referred to as: piston oil seal failure monitoring device) provided by the present invention; the filter plate pressing mechanism is mainly composed of a hydraulic station, a pressing plate oil cylinder 10, a hydraulic oil pipeline, a pressing stroke limit device, and a piston oil seal failure monitoring device 9; it has the function of automatically pressing multiple filter plates 16 to form multiple pressing filter chambers and maintaining pressure for the pressing filter chambers. The technical parts shared by the present invention and the prior art are manufactured in accordance with the current standards of my country's machinery industry "Chamber filter press and plate and frame filter press Part 1: Type and basic parameters", "Part 2: Technical conditions", "Part 3: Filter plate", and "Part 4: Diaphragm filter plate" JB / T4333.

[0029] The hydraulic station includes a motor, an oil pump, an oil tank, an oil filter, an air filter, connecting pipes, a pressure gauge, an oil level gauge, and a hydraulic integrated valve group (including an electromagnetic reversing valve, a pressure reducing valve, a throttling speed regulating valve, and an electromagnetic overflow valve); the hydraulic station is placed on the ground at the rear of the machine and can provide and control hydraulic oil to extend and retract the piston rod 6 of the pressure plate cylinder 10.

[0030] The pressure plate cylinder 10 includes a cylinder barrel 8, a cylinder head, a piston rod 6, a piston, a guide sleeve, a piston rod oil seal, a piston oil seal 7, and a buffer device; the piston rod oil seal and the piston oil seal 7 are vulnerable parts. If they are worn excessively (seal failure), external leakage and internal leakage will occur respectively. The external leakage is visible, but the internal leakage is invisible; the cylinder barrel 8 of the pressure plate cylinder 10 is installed on the tail seat of the frame, and the cylinder piston rod 6 is connected to the filter plate clamping plate 11, which is used to tighten or loosen the filter plate 16.

[0031] The piston oil seal failure monitoring device 9 comprises a sensor mounting plate 1, a loose plate sensor 2 and a loose plate sensing plate 3; the loose plate sensing plate 3 is mounted on the lower side of the filter plate clamping plate 11 and can move with the filter plate clamping plate 11; when the filter plate 16 is clamped by the pressure plate cylinder 10, the sensor mounting plate 1 is fixedly mounted on the frame main beam 12 outside the sensing area and critically close to the right side of the loose plate sensing plate 3; the loose plate sensor 2 is mounted on the sensor mounting plate 1 and connected to the PLC program control system 18; the loose plate sensor 2 is dynamically adjusted to the loose plate sensing plate 3 (normal time-effect monitoring device is closed) through two-dimensional adjustment of the mounting plate adjustment hole 4 and the sensor mounting hole 5; it is used for online direct monitoring and instant transmission of abnormal looseness of the filter plate clamping plate 11, indirect judgment of the failure information of the piston oil seal 7, and timely control of shutdown to prevent material spraying from the filter chamber.

[0032] The working process of the filter plate clamping mechanism is as follows: (1) Preparation for clamping the filter plate 16: multiple sets of filter plates 16 (including diaphragm filter plates 15 and matching filter plates 14) covered with filter cloth are arranged alternately on the filter plate guide rails of the double-frame main beam 12 of the filter press, and are located between the filter plate clamping plate 11 and the thrust plate; (2) Pressing the filter plate 16 and maintaining pressure: under the control of the PLC program control system 18, the hydraulic station supplies high-pressure oil to the rodless chamber of the clamping plate cylinder 10, and the piston rod 6 pushes the filter plate clamping plate 11 to slowly press the filter plate 16. The concave parts (cavity parts) of adjacent filter plates 16 constitute multiple squeezing filter chambers, and the multiple squeezing filter chambers plus the head and tail anti-corrosion filter plates and various pipelines constitute a squeezing and filtering mechanism; the filter plate 16 is pressed and maintained under pressure; (3) Abnormal looseness monitoring: The abnormal looseness of the filter plate 16 is indirectly judged by online monitoring. Failure of the oil seal 7: When the filter plate clamping plate 11 is abnormally loose, the loose plate sensing plate 3 moves to the right (towards the tail end) with the filter plate clamping plate 11 and approaches the loose plate sensor 2. The loose plate sensor 2 transmits the abnormal looseness of the filter plate clamping plate 11 (i.e., failure of the piston oil seal 7) to the PLC program control system 18 online and immediately. The PLC program control system 18 promptly controls the shutdown (stops feeding or closes the high-pressure medium valve 17 on the high-pressure medium main pipe 13) to avoid material spraying from the filter chamber; (4) The filter plate 16 is normally loosened: When the filtration is completed, the hydraulic station supplies high-pressure oil to the rod chamber of the pressure plate cylinder 10, and the piston rod 6 pulls the filter plate clamping plate 11 slowly back to the tail end seat, and the filter plate 16 is loosened; (5) After the filter plate 16 is loosened: the plate pulling trolley of the plate unloading mechanism pulls the filter plate 16 to realize gravity unloading.

[0033] The filter plate clamping mechanism provided by the present invention has the beneficial effect that, by adding an indirect monitoring device 9 for the failure of the pressure plate cylinder piston oil seal, abnormal looseness of the filter plate clamping plate 11 can be monitored online to indirectly determine the failure of the piston oil seal 7, and timely control the shutdown to prevent the filter chamber from spraying; the automatic monitoring performance of the filter plate clamping mechanism is improved, and the technical problem of online monitoring of the failure of the piston oil seal 7, which people have always been eager to solve but have never succeeded in solving, is solved, material waste and environmental pollution caused by filter chamber spraying are eliminated, the safety hazards of corrosive material spraying are eliminated, and the safety and environmental protection performance of the filter press is improved; energy is expanded and efficiency is increased.

Claims

1. A filter plate pressing mechanism, i.e. a filter plate pressing and pressure-maintaining mechanism, comprising a hydraulic station, a pressing plate oil cylinder, a hydraulic oil pipe, a pressing stroke limit device, and a piston oil seal failure monitoring device; characterized in that: The piston oil seal failure monitoring device, i.e., the pressure plate cylinder piston oil seal failure indirect monitoring device, comprises a sensor mounting plate, a loose plate sensor, and a loose plate sensing plate; the sensor mounting plate, i.e., the loose plate sensor mounting plate, is a T-shaped stainless steel mounting plate, with a horizontal mounting plate adjustment hole at the upper end and a vertically adjustable sensor mounting hole at the lower end. When the pressure plate cylinder presses the filter plate, the sensor mounting plate is fixedly mounted on the main beam of the frame outside the sensing area and critically close to the right side of the loose plate sensing plate; the loose plate sensor, i.e., the piston oil seal failure filter plate abnormal looseness sensor, is a NBN12-18GM50-E2 proximity sensor. The loose plate sensor is mounted on the sensor mounting plate and connected to the PLC program control system. The loose plate sensor is dynamically matched to the loose plate sensing plate through two-dimensional adjustment of the mounting plate adjustment hole and the sensor mounting hole. The loose plate sensor can transmit abnormal looseness information of the filter plate pressing plate to the PLC program control system online and in real time for online direct monitoring Instantly transmit the abnormal looseness of the filter plate clamping plate and indirectly judge the failure of the piston oil seal; the loose plate sensing plate set, that is, the sensing point of the abnormal looseness of the filter plate when the piston oil seal fails, is an n-shaped stainless steel bent plate with a width of 8cm and a double mounting hole on one side; the loose plate sensing plate is installed on the lower side of the filter plate clamping plate and can move with the filter plate clamping plate; it is used for the equivalent sensing point of abnormal looseness of the filter plate clamping plate, that is, the failure of the piston oil seal; the dynamic relationship of the piston oil seal failure monitoring device: when the piston oil seal fails and the filter plate clamping plate is abnormally loose, the monitoring device is turned on, and the loose plate sensing plate moves to the right, that is, the tail direction of the filter plate clamping plate with the filter plate clamping plate to approach the loose plate sensor, and the loose plate sensor transmits the abnormal looseness information of the filter plate clamping plate to the PLC program control system online and instantly, and the PLC program control system controls the shutdown in time to prevent the filter chamber from spraying; the filter plate clamping mechanism, the cylinder barrel of the plate clamping oil cylinder is installed on the tail seat of the frame, and the cylinder piston rod is connected to the filter plate clamping plate, which has the function of automatically clamping multiple filter plates to form multiple squeeze filter chambers and maintaining pressure for the squeeze filter chamber.

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