Filter plate pressing device of vertical filter press

Abstract

The utility model discloses a vertical filter press filter plate compression device relates to solid -liquid separation technical field, and it aims at solving the problem of existing device compression synchronous difference, difficult to give consideration to guiding and self -locking, maintenance cost higher. The device includes the roof, the bottom plate and the fixed 4 guide columns of both, and the compression plate is established between the roof and the bottom plate, and the filter plate is located between the compression plate and the roof, the lower surface center of compression plate is equipped with rotary power drive device, and its output shaft drives four driving sprocket, and through chain drive to driven sprocket, drive the nut synchronous rise on guide column, and the compression plate is pushed through the thrust bearing, and it is also optimized trapezoidal thread, guide sleeve, chain tensioning mechanism and filter plate sealing positioning structure. The device adopts full mechanical transmission, improves compression synchronism and pressure stability, reduces energy consumption and maintenance cost, and adapts to the solid -liquid separation demand of multiple industries.

Description

Technical Field

[0001] This utility model relates to the field of solid-liquid separation technology, and in particular to a filter plate pressing device for a vertical filter press. Background Technology

[0002] Vertical filter presses, as highly efficient equipment in the field of solid-liquid separation, are widely used in industries such as chemical, mining, food, and environmental protection due to their advantages of small footprint, low filter cake moisture content, and convenient operation. Among these components, the filter plate pressing device is the core functional component of the vertical filter press. Its pressing accuracy, synchronization, and long-term stability directly determine the sealing effect of the filter chamber, filtration efficiency, and operating energy consumption. If the pressing device has problems such as poor synchronization or unreliable pressure holding, it can easily lead to material leakage and spraying between filter plates, wasting materials, polluting the working environment, and increasing equipment maintenance costs.

[0003] Utility model patent CN204261404U discloses a vertical filter press pressing device, which adopts a composite structure of multiple hydraulic cylinders and a mechanical locking mechanism. Initial pressing is achieved through hydraulic cylinder drive, followed by pressure maintenance by the mechanical structure, balancing pressing efficiency and energy consumption control. However, this technical solution still has certain drawbacks: the multiple cylinders are distributed along the edge of the pressing plate, failing to completely solve the core problem of poor synchronization among multiple actuators, leaving the risk of pressing misalignment still present; furthermore, the mechanical locking mechanism uses a single drive source to control multiple locking points with a linkage rod, resulting in a lag in locking force transmission and uneven force distribution at each locking point. This can easily lead to locking failure after long-term use, failing to meet the stability requirements of high-pressure, long-term filtration operations. Utility Model Content

[0004] To overcome the defects or one of the defects of the existing technology, this utility model provides a vertical filter press plate pressing device that integrates hydraulic pressing and mechanical locking. The technical solution adopted is as follows: A vertical filter press plate pressing device includes a top plate and a bottom plate, which are fixedly connected together by four guide columns. A pressing plate is disposed between the top plate and the bottom plate, and multiple filter plates are located between the pressing plate and the top plate. The pressing plate is characterized in that it has a clearance fit with the four guide columns, and the guide columns are provided with external threads within the vertical stroke range of the pressing plate. A nut is screwed onto each guide column below the pressing plate, and a thrust bearing is disposed between the nut and the pressing plate. A driven sprocket is fixedly connected to the nut. A rotary power drive device is fixedly disposed at the center of the lower surface of the pressing plate, and four driving sprockets are fixedly connected to the output shaft of the rotary power drive device. A chain is wound around each driving sprocket and the corresponding driven sprocket.

[0005] Furthermore, the rotary power drive device is an electric motor or a hydraulic motor.

[0006] Furthermore, a fixing plate is fixedly arranged at intervals below the clamping plate, and the rotary power drive device is fixedly installed on the lower surface of the fixing plate; the output shaft of the rotary power drive device is fixedly connected to the lower end of the sprocket shaft through a coupling; a bearing seat is fixedly arranged at the center of the lower surface of the clamping plate, the bearing seat is interference-fitted with the outer ring of the bearing, and the inner ring of the bearing is interference-fitted with the upper end of the sprocket shaft to support the sprocket shaft.

[0007] Furthermore, the sprocket shaft is a four-segment stepped shaft with the diameter increasing sequentially from top to bottom. The second largest diameter segment is provided with a threaded segment and a smooth shaft segment in sequence along the axial direction. The four drive sprockets are stacked on the smooth shaft segment of the second largest diameter segment by flat keys, and radial positioning is achieved by the flat keys. The threaded segment is screwed with a first locking nut, which abuts against the end face of the drive sprocket to achieve axial positioning.

[0008] Furthermore, the thrust bearing is a double-direction thrust ball bearing, with its outer ring fixedly connected to the lower surface of the pressure plate and its inner ring fixedly connected to the upper surface of the nut.

[0009] Furthermore, the external thread on the guide post is a trapezoidal thread with a thread profile angle of 30° and a pitch of 3-6mm, which can achieve self-locking while also providing a guiding function.

[0010] Furthermore, a guide sleeve is fixedly embedded in the through hole of the clamping plate that cooperates with the four guide posts, and the inner hole of the guide sleeve is slidably engaged with the guide post.

[0011] Furthermore, the nut is a three-section threaded sleeve with a diameter decreasing from top to bottom, wherein the small diameter section is provided with a smooth shaft section and a threaded section in sequence along the axial direction; one driven sprocket and three washers with the same thickness as the driven sprocket are stacked on the smooth shaft section of the small diameter section by a flat key, and radial limiting is achieved by the flat key cooperating with the keyway of the smooth shaft section; the threaded section is screwed with a second locking nut, and the second locking nut abuts against the end face of the driven sprocket or washer to achieve axial limiting.

[0012] Furthermore, it also includes four chain tensioning mechanisms, each of which is correspondingly arranged on the outer side of one chain; each chain tensioning mechanism includes a bracket fixed to the lower surface of the pressure plate and a tensioning wheel mounted on the bracket by adjusting bolts. The tensioning wheel abuts against the outer chain plate of the chain, and the tensioning force of the tensioning wheel on the chain is adjusted by turning the adjusting bolts.

[0013] Furthermore, each filter plate has an annular sealing gasket on its circumferential edge. The sealing gasket is made of oil-resistant rubber and has a thickness of 3-5 mm. The fit clearance between the positioning pin and the positioning hole is 0.2-0.5 mm. An clearance hole is provided on the top plate at the position corresponding to the positioning pin. The diameter of the clearance hole is 2-3 mm larger than the nominal diameter of the positioning pin.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects: 1. Effectively improves the synchronization of pressing and avoids filter plate misalignment. This utility model uses a rotary power drive device at the center of the lower surface of the pressing plate to directly and synchronously drive four sets of active sprockets and chain transmissions, thereby driving the nuts on the four guide columns to rotate and rise synchronously. Compared with the existing technology of multiple hydraulic cylinders distributed for driving or linkage rods to transmit power, it can achieve precise synchronous action of the four locking mechanisms, making the pressing plate uniformly stressed and the filter plate fitting gap consistent, greatly reducing the risk of material leakage and spraying caused by insufficient synchronization.

[0015] 2. Balancing thread guidance function and self-locking reliability, simplifying the structure and ensuring stable pressure holding. This utility model uses a trapezoidal thread with a thread angle of 30° and a specific pitch as the external thread of the guide post. It utilizes the advantages of uniform contact and low wear of the trapezoidal thread guide surface to ensure smooth lifting and lowering of the pressure plate along the guide post. Furthermore, by optimizing the pitch, the thread helix angle is adapted to the self-locking requirements, achieving reliable pressure holding without the need for additional braking components. This avoids the contradictions of poor guidance performance of ordinary threads and insufficient self-locking of large-pitch trapezoidal threads in existing technologies, simplifying the overall structure of the device while improving long-term pressure holding stability.

[0016] 3. Optimize transmission and sealing details to enhance the long-term operational reliability of the device. On the one hand, a thrust bearing is installed between the nut and the pressure plate to reduce frictional wear between the nut and the pressure plate during rotation, extending the service life of the components. On the other hand, the added chain tensioning mechanism can dynamically compensate for the wear and elongation of the chain after long-term use, avoiding the accumulation of transmission gaps that affect synchronization. At the same time, the positioning holes and positioning pins at the four corners of the filter plate, along with the annular sealing gaskets on the circumferential edges, can further limit the lateral displacement of the filter plate and enhance the sealing effect between the filter plates, effectively solving the problems of easy wear of transmission components and easy failure of filter plate seals in the existing technology.

[0017] 4. The fully mechanical transmission structure reduces energy consumption and maintenance costs. This invention achieves filter plate clamping and pressure holding entirely through mechanical transmission, eliminating the need for continuous high-pressure oil supply during the pressure holding stage, as required by fully hydraulic clamping solutions, thus significantly reducing operating energy consumption. Furthermore, the overall structure primarily utilizes mature mechanical components such as sprockets, chains, and trapezoidal threads, reducing the need for complex components like cylinders and hydraulic pipelines compared to hydraulic-mechanical composite solutions. This eliminates the need to address issues such as hydraulic system leaks and cylinder wear during subsequent maintenance, reducing troubleshooting difficulty and maintenance costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 yes Figure 1 Top view.

[0020] Figure 3 yes Figure 2 Sectional view at point A-0-A.

[0021] Figure 4 yes Figure 3 A magnified view of a section at point B in the middle.

[0022] Figure 5 yes Figure 3 A magnified view of a section at point C. Detailed Implementation

[0023] 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.

[0024] like Figure 1-5 The vertical filter press plate pressing device shown includes a top plate 1 and a bottom plate 2. The top plate 1 and the bottom plate 2 are fixed together by four guide columns 3. A pressing plate 4 is arranged between the top plate 1 and the bottom plate 2. Multiple filter plates 5 are located between the pressing plate 4 and the top plate 1. The pressing plate 4 is clearance-fitted with the four guide columns 3. The guide columns 3 are provided with external threads within the upper and lower stroke range of the pressing plate 4. A nut 6 is screwed onto each guide column 3 below the pressing plate 4. A thrust bearing 7 is provided between the nut 6 and the pressing plate 4. A driven sprocket 8 is fixedly connected to the nut 6. A rotary power drive device 9 is fixedly provided at the center of the lower surface of the pressing plate 4. Four driving sprockets 10 are fixedly connected to the output shaft of the rotary power drive device 9. A chain 11 is wound around each driving sprocket 10 and the corresponding driven sprocket 8.

[0025] The core principle of the vertical filter press plate clamping device in this embodiment is fully mechanical synchronous transmission + screw motion conversion + self-locking pressure holding. The specific process can be divided into the following four steps according to the logic of power output, transmission and execution: 1. Power Output: The rotary power drive unit provides the core power. After the rotary power drive device at the center of the lower surface of the pressure plate is started, it outputs rotary power to its output shaft, which drives the four drive sprockets fixed on the output shaft to rotate synchronously. Since the four drive sprockets are directly driven by the same drive source, the initial synchronization of the four transmission mechanisms can be guaranteed from the source, avoiding the action deviation caused by multiple drive sources.

[0026] 2. Power transmission: The sprocket and chain achieve synchronous power distribution. Each driving sprocket transmits rotational power synchronously to the driven sprocket on the corresponding guide post via a chain. Since the driven sprocket is fixed to the nut, the rotation of the driven sprocket directly drives the nut to rotate synchronously. This process is transmitted through chain meshing, ensuring that the power received by the four nuts is at the same speed, laying the foundation for the subsequent synchronous pushing of the pressure plate.

[0027] 3. Motion Conversion: The threaded fit converts rotary motion into linear clamping action. The nut is screwed onto the external thread on the guide post, and the guide post is fixed (both ends are fixed to the top plate and the bottom plate). Therefore, the rotational motion of the nut can be converted into a linear upward motion along the axial direction of the guide post. At the same time, the thrust bearing between the nut and the pressure plate can isolate the rotational motion of the nut, avoid frictional loss between the nut and the pressure plate when the nut rotates, and only transmit the axial upward force of the nut to the pressure plate, pushing the pressure plate to rise smoothly along the guide post (which is clearance-fitted with the pressure plate and plays a guiding role).

[0028] 4. Compressing and Holding Pressure: The pressure plate acts as a seal for the filter plate, and the self-locking threads maintain pressure. The rising pressure plate gradually approaches and presses against the multiple filter plates located between it and the top plate until a tightly fitted filter chamber is formed between the filter plates, completing the pressing action. Since the external thread of the guide column is a trapezoidal thread with specific parameters (30° thread angle and matching pitch), its thread helix angle meets the self-locking condition. After pressing is completed, there is no need for the rotation power drive device to continuously output power. The nut can maintain its current position through thread self-locking, thereby maintaining the stable pressure of the pressure plate on the filter plates and achieving long-term pressure maintenance.

[0029] In another preferred embodiment, the rotary power drive device 9 is an electric motor or a hydraulic motor. It can be flexibly adapted to the load requirements and power supply conditions of the actual application scenario—electric motors have advantages such as high control precision, clean operation without oil stains, and low maintenance costs, making them suitable for conventional pressure filtration scenarios; hydraulic motors have the characteristics of large output torque and strong impact resistance, making them suitable for heavy-duty filtration conditions with high pressure and large loads, thus allowing the device to cover the solid-liquid separation needs of more industries and expanding its applicability.

[0030] In another preferred embodiment, a fixing plate 12 is fixedly disposed below the clamping plate 4 at a distance, and the rotary power drive device 9 is fixedly installed on the lower surface of the fixing plate 12; the output shaft of the rotary power drive device 9 is fixedly connected to the lower end of the sprocket shaft 14 through a coupling 13; a bearing seat 15 is fixedly disposed at the center of the lower surface of the clamping plate 4, the bearing seat 15 is interference-fitted with the outer ring of the bearing 16, and the inner ring of the bearing 16 is interference-fitted with the upper end of the sprocket shaft 14 to support the sprocket shaft 14. The rotary power drive device is installed below the clamping plate through the fixing plate, connected to the sprocket shaft with the coupling, and supported by the bearing seat and bearing. This not only provides a stable mounting base for the drive device through the fixing plate, avoiding shaking during operation and affecting power output, but also ensures that the power transmission between the drive device and the sprocket shaft is without deviation through the coupling. At the same time, the precise support of the bearing for the sprocket shaft can reduce its radial runout during rotation, thereby improving the overall stability and reliability of power transmission and avoiding transmission loss caused by component shaking.

[0031] In another preferred embodiment, the sprocket shaft 14 is a four-segment stepped shaft with an increasing diameter from top to bottom. The second largest diameter segment has a threaded segment and a smooth shaft segment along the axial direction. Four drive sprockets 10 are stacked on the smooth shaft segment of the second largest diameter segment via flat keys, achieving radial positioning via the flat keys. A first locking nut 17 is screwed onto the threaded segment, and the first locking nut 17 abuts against the end face of the drive sprocket 10 to achieve axial positioning. The sprocket shaft is designed as a four-segment stepped shaft, with the second largest diameter segment consisting of a smooth shaft segment and a threaded segment. The flat keys and first locking nuts secure the drive sprockets. The stepped shaft structure allows for precise positioning of the drive sprockets, preventing axial movement. The flat keys provide reliable radial positioning between the sprockets and the shaft, preventing power transmission failure caused by relative sliding. The first locking nut further secures the sprockets axially, ensuring that the four drive sprockets always rotate synchronously, completely eliminating the problem of decreased transmission synchronicity caused by sprocket loosening or misalignment.

[0032] In another preferred embodiment, the thrust bearing 7 is a double-direction thrust ball bearing, with its outer ring fixedly connected to the lower surface of the pressure plate 4 and its inner ring fixedly connected to the upper surface of the nut 6. The double-direction thrust ball bearing, with its inner and outer rings fixed to the pressure plate and nut respectively, provides a double-direction structure that can withstand both the axial pressure from the nut pushing the pressure plate and the reverse impact force from the filter plate's reaction force, avoiding the problem of easy damage to the bearing in one direction. The fixed connection between the inner and outer rings ensures direct and lossless force transmission, reduces relative friction between the bearing and components, extends the bearing's service life, and ensures that the nut's rotation does not cause the pressure plate to rotate synchronously, allowing the pressure plate to rise and fall smoothly only along the guide column.

[0033] In another preferred embodiment, the external thread on the guide post 3 is a trapezoidal thread with a thread profile angle of 30° and a pitch of 3-6mm, which can achieve self-locking while also providing guidance. The guide post external thread adopts a trapezoidal thread with a thread profile angle of 30° and a pitch of 3-6mm. The trapezoidal thread has a large contact area on the guide surface and uniform wear, which can ensure that the pressure plate moves smoothly up and down along the guide post and avoid the problem of jamming in ordinary thread guidance. The specific combination of thread profile angle and pitch can make the thread helix angle meet the self-locking condition. After clamping, no additional braking component is needed to maintain the pressure holding state. This simplifies the overall structure of the device and solves the contradiction between guidance and self-locking in the prior art, thus improving the pressure holding stability.

[0034] In another preferred embodiment, a guide sleeve 18 is fixedly embedded in the through hole of the pressing plate 4 that mates with the four guide posts 3. The inner hole of the guide sleeve 18 is slidably engaged with the guide post 3. The guide sleeve embedded in the through hole where the pressing plate mates with the guide post can directly isolate the pressing plate from the direct friction between the pressing plate and the guide post, avoiding wear and deformation caused by long-term sliding, and effectively extending the service life of the pressing plate and the guide post. At the same time, the inner hole of the guide sleeve has higher machining precision, which can further reduce the fit gap with the guide post, improve the guiding accuracy when the pressing plate is raised and lowered, prevent the pressing plate from tilting due to component wear, and ensure that the filter plate is always tightly fitted.

[0035] In another preferred embodiment, the nut 6 is a three-section threaded sleeve with a diameter decreasing from top to bottom, wherein the small diameter section is provided with a smooth shaft section and a threaded section in sequence along the axial direction; one driven sprocket 8 and three washers 19 with the same thickness as the driven sprocket 8 are stacked on the smooth shaft section of the small diameter section by a flat key, and radial limiting is achieved by the flat key cooperating with the keyway of the smooth shaft section; the threaded section is screwed with a second locking nut 20, and the second locking nut 20 abuts against the end face of the driven sprocket 8 or the washer 19 to achieve axial limiting. The nut is designed as a three-section threaded sleeve. The small-diameter section secures the driven sprocket via a smooth shaft section, a flat key, a washer, and a second locking nut. The three-section structure facilitates the installation and positioning of the driven sprocket. The washers can be adjusted in number or thickness to accommodate driven sprockets of different thicknesses, improving component versatility. The cooperation between the flat key and the keyway enables reliable radial positioning of the driven sprocket and the nut. The second locking nut axially secures the sprocket and the washer, ensuring synchronous rotation of the driven sprocket and the nut, avoiding power transmission lag caused by relative rotation. It is also easy to disassemble and assemble, facilitating future maintenance and replacement.

[0036] In another preferred embodiment, four chain tensioning mechanisms are further included, each corresponding to the outer side of one chain 11. Each chain tensioning mechanism includes a bracket fixed to the lower surface of the pressure plate 4 and a tensioning wheel mounted on the bracket via adjusting bolts. The tensioning wheel abuts against the outer chain plate of the chain, and the tensioning force of the tensioning wheel on the chain is adjusted by turning the adjusting bolts. By adding four corresponding chain tensioning mechanisms, the tensioning wheel's tension on the chain can be flexibly adjusted via adjusting bolts. When the chain wears and elongates after long-term use, there is no need to replace the chain; simply turning the adjusting bolts can compensate for the chain elongation, keeping the chain always taut. This effectively avoids problems such as increased sprocket meshing clearance and decreased transmission synchronization caused by chain slack, improving the long-term stability of the device, while reducing the frequency of chain replacement, lowering maintenance costs, and reducing downtime.

[0037] In another preferred embodiment, each filter plate 5 has an annular sealing gasket on its circumferential edge. The sealing gasket is made of oil-resistant rubber and has a thickness of 3-5 mm. The fitting clearance between the positioning pin 27 and the positioning hole 26 is 0.2-0.5 mm. The top plate 1 has a clearance hole corresponding to the position of the positioning pin, and the diameter of the clearance hole is 2-3 mm larger than the nominal diameter of the positioning pin. The filter plate has an oil-resistant rubber annular sealing gasket on its circumference, and the four corner positioning holes fit with the positioning pin. The top plate has clearance holes. The oil-resistant rubber sealing gasket can adapt to different oily or corrosive filter media, enhance the sealing effect between filter plates, and reduce the risk of leakage. The small clearance fit between the positioning pin and the positioning hole can limit the lateral displacement of the filter plate, ensure that multiple filter plates are always aligned, and avoid sealing failure caused by misalignment of the filter plates. The clearance holes on the top plate can prevent the positioning pin from colliding with the top plate when the pressing plate rises, ensuring that the pressing action is completed smoothly, and improving the overall sealing reliability of the filter chamber and the operational safety of the device.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A filter plate pressing device for a vertical filter press, comprising a top plate (1) and a bottom plate (2), the top plate (1) and the bottom plate (2) being fixed together by four guide columns (3), a pressing plate (4) being disposed between the top plate (1) and the bottom plate (2), and a plurality of filter plates (5) being located between the pressing plate (4) and the top plate (1), characterized in that, The clamping plate (4) is clearance-fitted with four guide posts (3), and the guide posts (3) are provided with external threads within the upper and lower stroke range of the clamping plate (4); each guide post (3) below the clamping plate (4) is screwed with a nut (6), and a thrust bearing (7) is provided between the nut (6) and the clamping plate (4), and a driven sprocket (8) is fixedly connected to the nut (6); a rotary power drive device (9) is fixedly provided at the center of the lower surface of the clamping plate (4), and four driving sprockets (10) are fixedly connected to the output shaft of the rotary power drive device (9), and a chain (11) is wound around each driving sprocket (10) and the corresponding driven sprocket (8).

2. The filter plate pressing device for a vertical filter press according to claim 1, characterized in that, The rotary power drive device (9) is an electric motor or a hydraulic motor.

3. The filter plate pressing device for a vertical filter press according to claim 1, characterized in that, A fixing plate (12) is fixedly arranged at intervals below the clamping plate (4), and the rotary power drive device (9) is fixedly installed on the lower surface of the fixing plate (12). The output shaft of the rotary power drive device (9) is fixedly connected to the lower end of the sprocket shaft (14) through a coupling (13). A bearing seat (15) is fixedly arranged at the center of the lower surface of the clamping plate (4). The bearing seat (15) is interference-fitted with the outer ring of the bearing (16), and the inner ring of the bearing (16) is interference-fitted with the upper end of the sprocket shaft (14) to support the sprocket shaft (14).

4. The filter plate pressing device for a vertical filter press according to claim 3, characterized in that, The sprocket shaft (14) is a four-section stepped shaft with the diameter increasing from top to bottom. The second largest diameter section is provided with a threaded section and a smooth shaft section along the axial direction. Four drive sprockets (10) are stacked on the smooth shaft section of the second largest diameter section by flat keys, and radial positioning is achieved by flat keys. The threaded section is screwed with a first locking nut (17), and the first locking nut (17) abuts against the end face of the drive sprocket (10) to achieve axial positioning.

5. The filter plate pressing device for a vertical filter press according to claim 1, characterized in that, The thrust bearing (7) is a double-direction thrust ball bearing, with its outer ring fixedly connected to the lower surface of the clamping plate (4) and its inner ring fixedly connected to the upper surface of the nut (6).

6. The filter plate pressing device for a vertical filter press according to claim 1, characterized in that, The external thread on the guide post (3) is a trapezoidal thread with a thread profile angle of 30° and a pitch of 3-6mm, which can achieve self-locking while also providing guidance.

7. The filter plate pressing device for a vertical filter press according to claim 6, characterized in that, A guide sleeve (18) is fixedly embedded in the through hole of the clamping plate (4) that cooperates with the four guide posts (3), and the inner hole of the guide sleeve (18) slides with the guide post (3).

8. The filter plate pressing device for a vertical filter press according to claim 1, characterized in that, The nut (6) is a three-section threaded sleeve with a diameter decreasing from top to bottom. The small diameter section is provided with a smooth shaft section and a threaded section in sequence along the axial direction. One driven sprocket (8) and three washers (19) with the same thickness as the driven sprocket (8) are stacked on the smooth shaft section of the small diameter section by a flat key. The radial limit is achieved by the flat key cooperating with the keyway of the smooth shaft section. The threaded section is screwed with a second locking nut (20). The second locking nut (20) abuts against the end face of the driven sprocket (8) or the washer (19) to achieve axial limit.

9. The filter plate pressing device for a vertical filter press according to claim 1, characterized in that, It also includes 4 chain tensioning mechanisms, each of which is set on the outside of a chain (11); the chain tensioning mechanism includes a bracket fixed on the lower surface of the pressure plate (4) and a tensioning wheel installed on the bracket by adjusting bolts. The tensioning wheel abuts against the outer chain plate of the chain, and the tensioning force of the tensioning wheel on the chain is adjusted by turning the adjusting bolts.

10. The filter plate pressing device for a vertical filter press according to claim 1, characterized in that, Each filter plate (5) has an annular sealing gasket on its circumferential edge. The sealing gasket is made of oil-resistant rubber and has a thickness of 3-5 mm. The fitting clearance between the positioning pin (27) and the positioning hole (26) is 0.2-0.5 mm. The top plate (1) has a clearance hole at the position corresponding to the positioning pin. The diameter of the clearance hole is 2-3 mm larger than the nominal diameter of the positioning pin.

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