Filter press with synchronous movement of filter cloth

Abstract

The present invention proposes a filter press with synchronous movement of filter cloth, comprising: a plurality of filter plate units, filter cloths are arranged between adjacent filter plate units; a filter cloth driving device for driving the filter cloth to reciprocate; a flattening and positioning device for the filter cloth, the filter cloth bypassing the flattening and positioning device; and a filter cloth cleaning device; wherein the adjacent filter plate units can approach each other to squeeze the material entering between the filter cloths to form a filter cake, and separate after the extrusion is completed, the filter cloth driving device can drive the corresponding filter cloth to synchronously move to remove the filter cake, the flattening and positioning device can flatten and position the filter cloth during the movement of the filter cloth, and the filter cloth cleaning device can work together with the flattening and positioning device to clean the filter cloth.

Description

Technical Field

[0001] The invention belongs to the technical field of solid-liquid separation, and in particular relates to a filter press with synchronous movement of filter cloth. Background Art

[0002] The filter press generally includes a fixed structure, a crossbeam, a filter plate and a filter plate clamping device arranged at both ends of the filter press, and a relatively closed filter space is formed by opening, closing and clamping the filter plate, and the filter cloth on both sides of the filter space is used to achieve solid-liquid separation. The filter press relies on the filter cloth for solid-liquid separation. The traditional filter press usually uses a fixed filter cloth, and its filter cloth is usually fixed on the filter plate. Manual intervention is usually required during the mud unloading process, otherwise it is difficult to unload the mud completely. After the filter cake is formed, the filter plate is opened, and the filter cake is unloaded under the action of gravity with simple mechanical actions. However, since the filter cake is formed under high pressure, the filter cake and the filter cloth are generally tightly bonded, and it is difficult to unload by its own gravity. Therefore, manual intervention is required to unload the cake, which leads to incomplete unloading of the filter cake, low efficiency of unloading of the filter cake, and poor unloading effect of the filter cake, which seriously affects the work of the next cycle. In addition, the existing filter press cannot achieve synchronous opening and closing of the filter plates because the filter plates have a large number of filter plates and filter cloths. The filter plates are opened and closed in sequence by adjacent filter plates. The mud unloading and flushing cycles are long, and the control is complex and inefficient.

[0003] At present, there are still some problems with the existing filter presses using moving filter cloths. For example, the existing filter press filter cloth cannot ensure that the filter cloth is centered during the re-upward resetting process, resulting in the accumulation of displacement deviations of the filter cloth, which will cause the filter plate frame on one side of the filter cloth to not be squeezed during the next filtration process, resulting in leakage during the filtration process. In addition, the existing filter press filter cloth resetting cannot ensure the flatness of the filter cloth, which will cause the frames of the two filter plates to be unable to be flat and sealed during the closing process, resulting in mud leakage during squeezing. These have seriously affected the filtration effect and work efficiency of the filter press.

[0004] Generally, the cloth hanging bracket or cloth hanging rod of the filter cloth is supported by a full-length rod, but for filter presses with a width of 1500mm or even larger, the length of the rod usually used needs to be guaranteed to be greater than 1600mm. This results in the rod being too long, and the rigidity of the middle section of the rod is difficult to ensure, which will cause the filter cloth to be loose in the middle and tight on both sides, which can easily cause the filter cloth to deform and shift, and cannot ensure that the filter cloth is relatively flat. General cloth hanging brackets or cloth hanging rods are heavy and have poor rigidity performance. They cannot ensure that the filter cloth is evenly stressed and have poor positioning accuracy. In addition, they are inconvenient to install and adjust, which can easily cause the filter cloth to fall off accidentally, seriously affecting the normal operation of the filter press.

[0005] During the extrusion process of the filter press, the water needs to be discharged to the bottom of the filter press, and when the filter material is unloaded, the generated filter cake needs to be unloaded to the bottom of the filter press. Traditional filter presses generally use a way of sacrificing working time to solve the problem. For example, after the filter cake of the filter press is unloaded to the bottom of the filter press, the filter press is turned off, and the filter press is cleaned or the next cycle is started after the filter cake below is completely cleared. This method leads to extremely low working efficiency of the filter press, a long working cycle, and the filter cake and the filter press discharge cannot be completely separated, resulting in the filter cake after the filter press contacting the filtrate for the second time, which seriously affects the filter press separation effect. In the prior art, a reversible liquid receiving tray is used. This liquid receiving tray has a complex structure, a large size, and occupies a large space, resulting in a bulky structure and insufficient rigidity. At the same time, the liquid receiving effect is not ideal. The hopper is below the liquid receiving tray. Once the liquid receiving tray is not completely received, the liquid will enter the hopper, which will seriously affect the filter press separation effect.

[0006] In addition, the filter press is used for solid-liquid separation of sludge. In order to ensure the working efficiency and effect of the filter press, the filter cloth of the filter press must be cleaned in a timely and effective manner. The filter press relies on pressurizing the material in the closed cavity to force the liquid in the material to pass through the filter cloth to achieve the purpose of solid-liquid separation. Therefore, the performance of the filter cloth directly affects the filtration effect of the filter press, and the contact between the filter cloth and the material, incomplete unloading and insufficient cleaning of the filter cloth will cause the performance of the filter cloth to decay. However, the existing filter press usually does not have a special filter cloth cleaning system. When cleaning the filter cloth, the filter cloth needs to be removed and then cleaned, which leads to extremely low cleaning efficiency, which seriously reduces the working efficiency of the filter press. In addition, although some high-end filter presses are designed with an automatic filter cloth cleaning system, their cleaning structure design is unreasonable, resulting in poor cleaning effect, high failure rate, long time-consuming cleaning of the filter cloth, and cannot be used normally, and cannot guarantee the stable filtration performance of the filter press. Summary of the invention

[0007] In view of the technical problems mentioned above, the present invention aims to propose a filter press with synchronous movement of filter cloth, which can drive the filter cloth to synchronously drive multiple filter cloths of the filter press to make them move synchronously to unload mud, and can keep the filter cloth centered and flat during the movement and effectively flattened when resetting, so as to avoid leakage and mud running during the next filtration process. In addition, the filter press can achieve dry and wet separation of unloading and can avoid the filter cake from being wetted, and can significantly reduce the installation height of the filter press. In addition, the filter press can also quickly, efficiently and comprehensively clean the filter cloth, so as to effectively ensure the long-term stability of the filtering performance of the filter cloth.

[0008] To this end, the present invention proposes a filter press with synchronous movement of filter cloth, comprising: a plurality of filter plate units, filter cloths are arranged between adjacent filter plate units; a filter cloth driving device for driving the filter cloth to reciprocate; a flattening and positioning device for the filter cloth, the filter cloth bypassing the flattening and positioning device; and a filter cloth cleaning device; wherein the adjacent filter plate units can approach each other to squeeze the material entering between the filter cloths to form a filter cake, and separate after the extrusion is completed, the filter cloth driving device can drive the corresponding filter cloth to synchronously move to remove the filter cake, the flattening and positioning device can flatten and position the filter cloth during the movement of the filter cloth, and the filter cloth cleaning device can work together with the flattening and positioning device to clean the filter cloth.

[0009] In one embodiment, the filter plate unit comprises a filter plate, and a first mounting frame and a second mounting frame are respectively fixed to upper and lower ends of the filter plate.

[0010] In one embodiment, the flattening and positioning device comprises two flattening and positioning shafts mounted on the second mounting frame, and the two flattening and positioning shafts are staggered and distributed in parallel.

[0011] In one embodiment, the flattened positioning shaft is configured to have a diameter that decreases from the axial middle to both ends, and a plurality of key grooves extending in the axial direction are provided on the outer surface of the flattened positioning shaft, and the plurality of key grooves are evenly distributed in the circumferential direction of the flattened positioning shaft.

[0012] In one embodiment, a spirally extending groove is provided on the outer circumferential surface of the flattened positioning shaft, and the groove is arranged to extend from the axial middle to both ends in a positive spiral shape and a reverse spiral shape respectively.

[0013] In one embodiment, the filter cloth driving device includes a filter cloth driving shaft mounted on the first mounting frame, and a main synchronous driving shaft arranged above each of the filter cloth driving shafts, the main synchronous driving shaft forms a transmission connection with each of the filter cloth driving shafts, and the main synchronous driving shaft can drive each of the filter cloth driving shafts to rotate synchronously.

[0014] In one embodiment, the filter cloth driving device also includes a transmission chain arranged at both ends of the filter cloth driving shaft, and sprockets that are connected to the transmission chain are fixedly installed at both ends of the filter cloth driving shaft, and the filter cloth driving shaft drives the transmission chain to move through the sprockets.

[0015] In one embodiment, the upper and lower ends of the filter cloth are respectively fixedly connected with a first cloth hanging rack and a second cloth hanging rack, the filter cloth passes around the corresponding flattening positioning shaft and is respectively fixedly connected with the two ends of the transmission chain through the first cloth hanging rack and the second cloth hanging rack.

[0016] The filter cloth driving shaft can drive the filter cloth to reciprocate around the flattening and positioning shaft through the transmission chain.

[0017] In one embodiment, the filter cloth cleaning device comprises a cleaning water pipe arranged below the flattening and positioning shaft, and the cleaning water pipe is mounted on the second mounting frame and is parallel to the flattening and positioning shaft.

[0018] In one embodiment, a plurality of cleaning nozzles evenly spaced apart along the axial direction are provided on the cleaning water pipe, and the plurality of cleaning nozzles are respectively and alternately aimed at the two flattening positioning axes in sequence, and the cleaning nozzles can spray cleaning liquid to the area of ​​the filter cloth surrounding the flattening positioning axes, thereby cleaning the filter cloth.

[0019] In one embodiment, the spray water line formed by the cleaning nozzle is tangent to the outer surface of the flattening and positioning shaft, and can form a continuous spray to the filter cloth.

[0020] In one embodiment, it further comprises a discharge and conveying device for receiving the filtrate and the filter cake, wherein the discharge and conveying device is arranged below the filter plate unit and can separate and output the filtrate and the filter cake.

[0021] Compared with the prior art, the advantages of this application are:

[0022] According to the filter press with synchronous movement of filter cloth of the present invention, its filter cloth driving device can drive the filter cloth to move synchronously to completely separate the filter cake from the filter cloth for mud unloading, which significantly improves the efficiency of unloading filter cake and cleaning filter cloth of the filter press, and its control precision is high, which can ensure the long-term stable operation of the filter cloth. Under the action of the flattening and positioning device, the filter cloth can be kept relatively centered during the movement to avoid serious deviation, effectively avoiding leakage and mud running during the next filter pressing process, and the flattening and positioning device can effectively flatten the filter cloth when resetting, which is very conducive to enhancing the filter pressing effect of the filter cloth, thereby significantly enhancing the mud unloading effect of the filter press. In addition, during the movement of the filter cloth, the filter cloth cleaning device works together with the flattening and positioning device to perform high-pressure jet cleaning on the filter cloth, which can not only realize fast, efficient and comprehensive cleaning of the filter cloth, ensure the long-term stability of the filtering performance of the filter cloth, but also greatly improve the cleaning efficiency of the filter cloth, and significantly enhance the cleaning effect of the filter cloth. The unloading and conveying device can efficiently separate the filter cake, filtrate and cleaning liquid of the filter press, effectively preventing the filter cake from being wetted again by the filtrate and cleaning liquid. The unloading and conveying device is small in size and low in height, which greatly reduces the installation height of the filter press and reduces the space occupied by the filter press. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described below with reference to the accompanying drawings.

[0024] Figure 1The structure of a filter press with synchronous movement of filter cloth according to the present invention is schematically shown.

[0025] Figure 2 Shows Figure 1 The distribution structure of the filter plate unit in the filter press is shown.

[0026] Figure 3 The structure of the filter cloth drive is shown.

[0027] Figure 4 Shows Figure 3 The structure of the transmission gear assembly in the filter cloth driving device shown.

[0028] Figure 5 The connection structure of the filter cloth between two adjacent filter plate units is schematically shown.

[0029] Figure 6 The structure of the flattened positioning axis is shown.

[0030] Figure 7 yes Figure 6 A transverse cross-section of the flattened positioning axis along line AA is shown.

[0031] Figure 8 The structure of the filter cloth cleaning device is shown.

[0032] Fig. 9 Shows Figure 8 The distribution structure of the cleaning nozzles in the cleaning device shown.

[0033] Fig.10 The schematic diagram shows the distribution principle between the cleaning nozzle and the flattening positioning axis.

[0034] Fig.11 The three-dimensional structure of the unloading and conveying device is shown.

[0035] Fig.12 and Fig.13 They are Fig.11 The unloading and conveying device is shown in right and left views.

[0036] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0037] The present invention will be described below with reference to the accompanying drawings.

[0038] In this application, it should be noted that the directional terms or qualifiers "upper", "lower", etc. used in this application are all directed to the attached drawings to which they are referred. Figure 1They are not intended to define the absolute positions of the components involved, but may vary depending on the specific circumstances.

[0039] like Figure 1 and Figure 2 As shown, the filter press 100 with synchronous filter cloth movement according to the present invention includes a plurality of filter plate units 10. The filter plate unit 10 includes a filter plate 11, and a first mounting frame 12 and a second mounting frame 13 are fixed at the upper and lower ends of the filter plate 11, respectively. The filter plate unit 10 also includes a filter cloth 14 arranged between adjacent filter plates 11, and two filter cloths 14 are arranged in a cavity formed by the two adjacent filter plates 11 being joined together, and the filter cloths 14 are enclosed in the frame around the filter plate 11. The material to be filtered enters between the two filter cloths 14 through the feeder between the two filter cloths 14, and under the filtering action of the filter plate 11 of the filter press, the liquid material passes through the filter cloth 14 and enters the filtrate collection pipe and is discharged. As a result, the solid material fed is intercepted by the filter cloth 14 and squeezed to form a filter cake, thereby achieving solid-liquid separation.

[0040] According to the present invention, the filter press 100 further includes a filter cloth driving device 20 for driving the filter cloth to reciprocate, a flattening and positioning device 30 for the filter cloth, and a filter cloth cleaning device 40 for cleaning the filter cloth. The filter cloth 14 passes through the flattening and positioning device 30, and the upper and lower ends are respectively connected to the filter cloth driving device 20. The filter cloth driving device 20 can drive the corresponding filter cloths 14 in the plurality of filter plate units 10 to move synchronously, and the filter cloth 14 will flip and move upward after moving to the bottom, and then the filter cake can be completely peeled off while the filter cloth 14 is separated from the filter cake, thereby realizing synchronous mud unloading. In this way, by synchronously driving the filter cloth to move, it is beneficial to flatten and position the filter cloth 14, and to perform comprehensive and effective cleaning, which is very beneficial to improving the mud unloading efficiency and the cleaning efficiency, and enhancing the mud unloading effect and the cleaning effect.

[0041] Figure 3 The overall structure of the filter cloth driving device 20 is shown. Figure 3 As shown, the filter cloth drive device 20 includes a filter cloth drive shaft 21 correspondingly mounted on the first mounting frame 11, and a main synchronous drive shaft 22 arranged above each filter cloth drive shaft 21. The main synchronous drive shaft 22 is arranged above each filter cloth drive shaft 21, and the main synchronous drive shaft 22 is perpendicular to each filter cloth drive shaft 21, and is located in the axial middle position of each filter cloth drive shaft 21. A transmission connection is formed between the main synchronous drive shaft 22 and each filter cloth drive shaft 21, so that the main synchronous drive shaft 22 can simultaneously drive each filter cloth drive shaft 21 to rotate synchronously. The filter cloth drive device 20 also includes a drive motor 23 for providing power. The drive motor 23 is arranged at one end of the main synchronous drive shaft 22, and is used to drive the main synchronous drive shaft 22 to rotate.

[0042] In one embodiment, the main synchronous drive shaft 22 and each filter cloth drive shaft 21 are connected to each other through a transmission gear assembly 24. Figure 4 As shown, the transmission gear assembly 24 can adopt a staggered axis gear assembly, which includes a radial ball bearing seat 241 and a first gear 242 and a second gear 243 mounted on the radial ball bearing seat 241. The first gear 242 and the second gear 243 are meshed with each other, and the central axes are perpendicular to each other. The radial ball bearing seat 241 is fixedly mounted on the first mounting frame 12, and the radial ball bearing seat 241 is rotatably connected to the filter cloth drive shaft 21. The first gear 242 is mounted on the main synchronous drive shaft 22. The second gear 243 is mounted on the filter cloth drive shaft 21 and is fixedly connected to the filter cloth drive shaft 21. The main synchronous drive shaft 22 rotates under the drive of the drive motor, and can simultaneously drive each filter cloth drive shaft 21 to rotate, and then drive the transmission chain 25 (see below) to move through the filter cloth drive shaft 21, thereby driving each filter cloth 14 to achieve synchronous movement. As a result, the filter cloth 14 between adjacent filter plate units 10 can reciprocate synchronously, ensuring that the filter press can achieve synchronous mud unloading.

[0043] According to the present invention, the main synchronous drive shaft 22 is configured as a spline shaft. The first gear 242 is adapted and installed with the main synchronous drive shaft 22, and the main synchronous drive shaft 22 can drive the first gear 242 to rotate, and the first gear 242 can reciprocate along the axial direction of the main synchronous drive shaft 22. Thus, each filter plate unit 10 is connected to the main synchronous drive shaft 22 through the first gear 242. During the opening and closing process of the filter plate unit 10, the main synchronous drive shaft 22 does not rotate, and the first gear 242 moves along the axial direction of the main synchronous drive shaft 22, thereby opening or closing the adjacent filter plate unit 10. When the adjacent filter plate unit 10 is in an open state, the main synchronous drive shaft 22 can rotate under the action of the drive motor and drive the first gear 242 to rotate.

[0044] In this embodiment, a linear module (not shown) for responding to the rotational position of the main synchronous drive shaft 22 is provided at the end of the main synchronous drive shaft 22 opposite to the drive motor. The position of the linear module can indirectly respond to the movement position of the filter cloth 14 driven by the main synchronous drive shaft 22 driving the filter cloth drive shaft 21, thereby realizing secondary monitoring and control of the filter cloth position.

[0045] In one embodiment, transmission chains 25 are provided at both ends of the filter cloth drive shaft 21, and the filter cloth drive shaft 21 is connected to the transmission chain 25 in a transmission manner, so that the filter cloth drive shaft 21 can drive the transmission chain 25 to move. Sprocket wheels 26 are provided at both ends of the filter cloth drive shaft 21, and the transmission chain 25 is adaptively connected to the sprocket wheels 26. The upper and lower ends of the filter cloth 14 are respectively fixedly connected to the first cloth hanging rack 141 and the second cloth hanging rack 142. The two ends of the first cloth hanging rack 141 are respectively connected to the upper ends of the two transmission chains 25 ( Figure 2 The filter cloth 14 is fixedly connected to the upper end of the flattening and positioning shaft 31, and the two ends of the second cloth hanging rack 142 are respectively fixedly connected to the lower ends of the two transmission chains 25, so that the filter cloth is suspended and installed. As a result, the transmission chain 25, the first cloth hanging rack 141, the filter cloth 14 and the second cloth hanging rack 142 are connected in sequence to form a closed loop connection. The filter cloth drive shaft 21 can drive the transmission chain 25 to reciprocate, thereby driving the filter cloth 14 to reciprocate, to adapt to the opening and closing of the filter plate unit 10 of the filter press to perform the sludge squeezing and sludge unloading operations of the filter press.

[0046] In this embodiment, the first cloth hanging rack 141 and the second cloth hanging rack 142 are both connected to the filter cloth through the segmented support structure, so as to realize the lateral positioning of the filter cloth, so that the filter cloth is evenly stressed, and the installation and connection positioning of the filter cloth is accurate and has high repeatability, which can ensure that the filter cloth is firmly fixed, which greatly optimizes the stress structure of the filter cloth and can effectively avoid the deformation of the filter cloth. The first cloth hanging rack 141 and the second cloth hanging rack 142 have good rigidity performance, which can effectively ensure their support performance. The first cloth hanging rack 141 and the second cloth hanging rack 142 are also respectively provided with limit members, through which the mechanical structure can be interlocked, so as to effectively avoid the filter cloth from falling off and ensure the tightness of the filter cloth connection. In addition, the first cloth hanging rack 141 and the second cloth hanging rack 142 have simple structures, light weight, high rigidity, and convenient installation, and can realize the rapid installation and disassembly of the filter cloth, and are easy to adjust, which is very beneficial to the use and maintenance of the filter cloth.

[0047] In order to ensure that the transmission chain 25 is in a stable transmission state and that the filter cloth 14 is in a stable movement and remains centered, two symmetrically distributed guide pulleys 27 are provided on the first mounting frame 12. Figure 3 As shown, the guide pulley 27 is arranged below the sprocket 26 and is staggered with the sprocket 26 in the transverse direction. The guide pulley 27 can not only effectively ensure the smooth transmission of the transmission chain 25, but also effectively avoid the collision and contact between the transmission chain 25 and the filter plate unit 10, thereby improving the safety performance of the transmission chain 25. In addition, in order to ensure that the filter cloth 14 can be accurately reset in the vertical direction, position sensors (not shown) can be respectively provided on the transmission chain 25. The position sensor can accurately reflect the vertical position of the filter cloth 14.

[0048] During the operation of the filter press 100 with synchronous filter cloth movement according to the present invention, the main synchronous drive shaft 22 rotates under the action of the drive motor, and drives the corresponding filter cloth drive shaft 21 to rotate simultaneously through each transmission gear assembly 24, so that each filter cloth drive shaft 21 drives the corresponding transmission chain 25 to move, and the transmission chain 25 drives the first cloth hanging rack 141 and the second cloth hanging rack 142 to move up and down, thereby driving the corresponding filter cloth 14 seats in each filter plate unit 10 to move up and down, thereby realizing the synchronous movement of the filter cloth. Controlling the direction of rotation of the drive motor 23 can realize the reverse reset movement of the filter cloth 14 accordingly. Thus, the filter cloth 14 between adjacent filter plate units 10 can be synchronously reciprocated, so that the filter press 100 can synchronously squeeze the sludge and unload the sludge, which ensures that the filter press 100 can quickly unload the filter cake and greatly improves the unloading efficiency of the filter press 100.

[0049] According to the present invention, the flattening positioning device 30 includes two flattening positioning shafts 31 mounted on the second mounting frame 13, the two flattening positioning shafts 31 are parallel to each other and spaced apart, and the two flattening positioning shafts are staggered in the horizontal direction and the vertical direction. Two filter cloths 14 are arranged between adjacent filter plate units 10, and the upper ends of the two filter cloths 14 are fixedly connected to the same first cloth hanging frame 141. The following is an example of two adjacent filter plate units. Figure 5 The figure schematically shows the connection structure of the filter cloth between two adjacent filter plate units. Figure 5As shown, the filter cloth 14 of the filter press is in a reset state. In the first filter plate unit 10, the transmission chain 25 bypasses the sprocket 26 and the guide pulley 122, and one end is fixedly connected to the first cloth hanging rack 141, and the other end is fixedly connected to the second cloth hanging rack 142. The lower end of the filter cloth 14 bypasses the flattening and positioning shaft 31 relatively located below and is fixedly connected to the second cloth hanging rack 142, while the upper end is fixedly connected to the first cloth hanging rack 141, so that the moving chain 120, the first cloth hanging rack 141, the filter cloth 14 and the second cloth hanging rack 142 are connected in sequence to form a closed loop. At the same time, one end of another filter cloth 14' between the first filter plate unit 10 and the adjacent second filter plate unit 10' is fixedly connected to the first cloth hanging rack 141 in the first filter plate unit 10, and the other end bypasses another flattening and positioning shaft 31 relatively located above in the second filter plate unit 10' and is fixedly connected to the second cloth hanging rack 142 in the second filter plate unit 10'. Thus, a space for adding materials to be filtered is formed between the adjacent first filter plate unit 10 and the second filter plate unit 10', and between the filter cloth 14 and the filter cloth 14'. In the process of unloading the filter cake, the transmission chain 25 in each filter plate unit drives the corresponding first cloth hanging rack 141 to move downward synchronously, and drives the corresponding second cloth hanging rack 142 to move upward, thereby driving the corresponding filter cloth 14 and the filter cloth 14' to move, and then the filter cake is peeled off from the filter cloth. After the filter cloth moves downward to the lowest position, the filter cake on the filter cloth is completely peeled off and separated, and the filter cloth is driven upward again by the transmission chain 25 to reset and flatten the filter cloth. Thus, the filter cloth is reciprocated to adapt to the opening and closing of the filter plate and the unloading of the filter cake.

[0050] like Figure 6 As shown, the flattening and positioning shaft 31 is constructed so that its diameter decreases from the axial middle to both ends, thereby forming a spindle-shaped structure. During the reciprocating motion of the filter cloth, this structure of the flattening and positioning shaft 31 can effectively keep the filter cloth relatively centered and avoid serious deviation. In this embodiment, a plurality of key grooves 32 extending in the axial direction are provided on the outer surface of the flattening and positioning shaft 31, and the plurality of key grooves 32 are evenly distributed in the circumferential direction of the flattening and positioning shaft 31, so that the cross-sectional shape of the flattening and positioning shaft 31 forms a spline shape. During the movement of the filter cloth, this spline groove structure of the flattening and positioning shaft 31 can realize the vibration of the filter cloth from the inside of the filter cloth, thereby improving the cleaning effect of the filter cloth, which is more conducive to the removal of the filter cake.

[0051] According to the present invention, a spirally extending groove 33 is provided on the outer circumferential surface of the flattened positioning shaft 31. Figure 6As shown, the groove 33 is arranged to extend from the axial middle to one end in a positive spiral shape, and to extend to the opposite end in a reverse spiral shape. The spiral angle of the spiral line formed by the extension of the groove 33 is arranged to be within the range of 15° to 25°. The width of the groove 33 is arranged to be 3 to 7 mm, and the depth is arranged to be 4 to 10 mm. During the resetting process of the filter cloth 14, the spiral groove structure of the flattening and positioning shaft 31 can effectively flatten the filter cloth, which is very beneficial to enhancing the filter pressing effect of the filter cloth 14. At the same time, during the cleaning process of the filter cloth 14, the structure of the flattening and positioning shaft 31 can greatly improve the cleaning efficiency of the filter cloth 14 and significantly enhance the cleaning effect of the filter cloth. The flattening and positioning device 30 is very beneficial to improving the working efficiency of the filter press 100 and enhancing the mud unloading effect of the filter cloth 14 on the filter cake.

[0052] like Figure 6 As shown, an annular boss 34 extending radially outward is provided at both ends of the flattened positioning shaft 31, and the annular boss 34 is arranged on the axial inner side of the flattened positioning shaft 31. Figure 7 As shown, the outer diameter of the annular boss 34 is set to be larger than the outer diameters of the axial ends of the flattened positioning shaft 31 and smaller than the outer diameter of the middle portion of the flattened positioning shaft 31. The annular boss 34 can center the filter cloth, thereby effectively preventing the filter cloth from excessively deflecting. Preferably, the annular boss 34 is made of wear-resistant plastic material.

[0053] like Figure 8 As shown, the filter cloth cleaning device 40 is arranged at the lower end of the filter plate unit 10 through the second mounting frame 12. The filter cloth cleaning device 40 includes two cleaning water pipes 41 arranged below the flattening and positioning shafts 31, and the cleaning water pipes 41 are mounted on the second mounting frame 12 and are distributed in parallel with the two flattening and positioning shafts 31. A plurality of cleaning nozzles 42 are arranged on the cleaning water pipes 41. The cleaning nozzles 42 are used to clean and purge the filter cloth 14 and the flattening and positioning shafts 31, so as to remove the dirt that may exist between the filter cloth 14 and the flattening and positioning shafts 31. During the cleaning process, the filter cloth 14 moves up and down around the flattening and positioning shafts 31 under the driving action of the filter cloth driving device 20, and the filter cloth 14 is flattened and stretched under the action of the flattening and positioning shafts, and at the same time, the cleaning liquid is sprayed to the area of ​​the filter cloth 14 surrounding the flattening and positioning shafts 31 through the cleaning nozzles 42, so as to clean the filter cloth 14. The filter cloth cleaning device 40 performs high-pressure jet cleaning on the filter cloth 14 during the movement of the filter cloth 14 , and can quickly and effectively complete the cleaning of the filter cloth 14 , with high cleaning efficiency and significant cleaning effect.

[0054] like Figure 8As shown, both ends of the cleaning water pipe 41 are correspondingly mounted on the first mounting frame 12. A rotary joint 43 is provided on the first mounting frame 12, and the rotary joint 43 extends to the outside of the first mounting frame 12, and is used to connect the water tank to provide cleaning liquid. The rotary joint 43 is connected to the first end of the cleaning water pipe 41 to pass the cleaning liquid into the cleaning water pipe 41. At the same time, a mobile nozzle (not shown) is connected to the second end of the cleaning water pipe 41, and the mobile nozzle can clean and purge the flattening positioning shaft 31 and the inner side of the filter cloth 14 from the inner side of the filter cloth 14, thereby further enhancing the cleaning effect of the filter cloth 14.

[0055] like Fig. 9 As shown, a plurality of cleaning nozzles 42 are evenly spaced apart along the axial direction of the cleaning water pipe 41, and the plurality of cleaning nozzles 42 are alternately aligned with the two flattening and positioning shafts 31 in sequence. Thus, two rows of cleaning nozzles 42', 42" are formed on the cleaning water pipe 41. In one embodiment, the cleaning nozzle 42 adopts a fan-shaped high-pressure nozzle. In addition, the cleaning nozzle 42 can form a continuous spray on the filter cloth 14, thereby ensuring that the sprayed cleaning liquid forms a continuous and uninterrupted water line on the surface of the filter cloth 14. The spray water line formed by the cleaning nozzle 42 is tangent to the outer surface of the flattening and positioning shaft 31. During cleaning, the cleaning nozzle 42 is combined with the flattening and positioning shaft 31, and the filter cloth 14 is flattened and stretched through the flattening and positioning shaft 31. At the same time, the cleaning nozzle 42 is aligned with the flattening and positioning shaft 31, so that the part of the filter cloth 14 that bypasses the flattening and positioning shaft 31 and is stretched is cleaned by high-pressure spraying. This greatly enhances the cleaning effect of the filter cloth 14.

[0056] Fig.10 The schematic diagram shows the distribution principle between the cleaning nozzle 42 and the flattening and positioning shaft 31. Fig.10 As shown, the two rows of cleaning nozzles 42' and 42" on the cleaning water pipe 41 are respectively aligned with the front flattening positioning axis 31 and the rear flattening positioning axis 31', so that the filter cloths 14 and 14' that bypass the front flattening positioning axis 31 and the rear flattening positioning axis 31' can be sprayed and cleaned. The angle d formed between the nozzle direction of the first row of cleaning nozzles 42' and the vertical direction of the position of the front flattening positioning axis 31 is in the range of 0-15°, and the angle c formed between the nozzle direction of the second row of cleaning nozzles 42" and the vertical direction of the position of the rear flattening positioning axis 31' is in the range of 0-55°. It should be noted here that, in the horizontal direction, the direction close to the cleaning nozzle is defined as the front or similar terms, and the direction away from the cleaning nozzle is defined as the rear or similar terms. In actual work, by adjusting the angles c and d, the cleaning nozzles 42' and 42" can achieve the best cleaning effect on the filter cloth.

[0057] When the filter cloth cleaning device 40 cleans the filter cloth 14, the filter cloth 14 moves up and down around the flattening and positioning shaft 31 under the driving action of the filter cloth driving device 20 of the filter press 100. The filter cloth 14 is flattened and stretched under the action of the flattening and positioning shaft 31, and is kept centered under the action of the annular boss 34. During the movement of the filter cloth 14, the filter cloth 14 can be vibrated from the inside under the action of the multiple key slots 32 of the flattening and positioning shaft 31, thereby improving the cleaning effect of the filter cloth 14. In addition, the filter cloth 14 can be effectively flattened under the action of the spiral groove 33, thereby further enhancing the cleaning effect of the filter cloth 14. At the same time, the cleaning nozzle 42 sprays the cleaning liquid to the area of ​​the filter cloth 14 surrounding the flattening and positioning shaft 31 to form a high-pressure jet, thereby cleaning the filter cloth 14. The filter cloth cleaning device 40 performs high-pressure jet cleaning on the filter cloth 14 by combining the flattening positioning shaft 31 and the high-pressure cleaning nozzle 42 during the movement of the filter cloth 14, which can not only achieve rapid, efficient and comprehensive cleaning of the filter cloth 14, ensuring the long-term stability of the filtering performance of the filter cloth 14, but also greatly improves the cleaning efficiency of the filter cloth 14 and significantly enhances the cleaning effect of the filter cloth 14. In addition, the filter cloth cleaning device 40 has a high degree of automation, simple operation and control, and is easy to repair and maintain. It can not only extend the service life of the filter cloth 14, but also effectively reduce the performance degradation of the filter cloth 14.

[0058] The filter cloth cleaning device 40 can independently clean a piece or a group of filter cloths 14, and can also simultaneously clean all the filter cloths 14 of the filter press. It is simple to operate and flexible to apply. It is very suitable for cleaning the filter cloths 14 of the filter press. It can significantly reduce the difficulty of cleaning the filter cloths 14, improve the cleaning efficiency, and achieve comprehensive cleaning of the filter cloths 14.

[0059] According to the present invention, the filter press further comprises a discharge and conveying device 60, which is arranged directly below the filter plate unit 10. Fig.11 As shown, the discharge and conveying device 60 includes two side baffles 61 that are arranged opposite to each other and extend along the length direction of the filter press 100. The side baffles 61 are configured as rectangular plates, and the cross-sectional shape of the side baffles 61 is configured as a C-shape, and the side baffles 61 serve as the outer shell of the discharge and conveying device 60. The discharge and conveying device 60 is used to be placed under the filter press to receive the filtrate and the filter cake, and to separate and output the filtrate and the filter cake.

[0060] In this embodiment, the upper ends of the two side baffles 61 are provided with guide plates 62 inclined outward, so that a receiving opening for receiving filtrate and filter cake is formed between the upper ends of the two side baffles 61. The angle of the guide plate 62 inclined outward is set to be within the range of 0-45°. The opening of the receiving opening is larger than the lateral ( Fig.12The horizontal direction) dimension in the middle enables the unloading and conveying device 60 to completely intercept the sludge and filtrate, effectively preventing the filtrate and filter cake from spilling.

[0061] According to the present invention, a filter screen 63 is provided between the two side baffles 61, and the filter screen 63 is connected end to end to form a closed loop, thereby forming a two-layer filter screen structure between the two side baffles 61. The filter screen 63 can carry the filter cake unloaded by the filter press, and the filter screen 63 is configured to be able to move along the closed loop, thereby conveying the received filter cake. A liquid receiving cavity is provided at the lower end of the filter screen 63, and the liquid receiving cavity is used to receive the filtrate produced by the filter press. The filtrate enters the liquid receiving cavity after passing through the filter screen 63, and the liquid receiving cavity can discharge the received filtrate. The filter screen 63 adopts a rigid support, which has good rigidity support performance, thereby ensuring that the requirements of rapid falling impact and accumulation of the filter cake are met.

[0062] In this embodiment, the filter screen 63 is constructed to include a plurality of connecting plates hinged in sequence, and a plurality of through holes are evenly distributed on the connecting plates. A track (not shown) is provided on the inner side of the side baffle 61, and the filter screen 63 is installed between the two side baffles 61 through the track, and the filter screen 63 can move along the track.

[0063] According to the present invention, transmission chains (not shown) are provided on both sides of the filter screen 63, and the transmission chains can drive the filter screen 63 to move in a closed loop along the track, so that the filter cake on the filter screen 63 is transported to other conveying mechanisms to be transported to the next process unit. Among them, a driving shaft and a driven shaft are respectively provided on the inner sides of the two ends of the side baffle 61, and the transmission chain forms a transmission connection with the driving shaft and the driven shaft respectively. The driving shaft can drive the transmission chain to move, thereby driving the filter screen 63 to move along the track. The driving shaft is arranged at the discharge output end of the discharge and conveying device 60, and the height of the driving shaft is set to be greater than the height of the driven shaft, so that the filter screen 63 forms a slope at the discharge output end, thereby enabling the discharge to be conveyed to other conveying mechanisms.

[0064] like Fig.12 and Fig.13 As shown, a protective groove 611 is provided on the inner side of the side baffle 61, and protective baffles 612 capable of protecting the transmission chain are provided on both sides of the filter screen 63, and the protective baffles 612 are correspondingly located in the protective groove 611. The protective baffles 612 and the protective groove 611 can prevent filter cakes or washed impurities from entering the chains on both sides.

[0065] In order to prevent the transmission chain from lateral deviation, a plurality of spaced lateral positioning pulleys (not shown) can be provided on the outside of the transmission chain. The lateral positioning pulleys can effectively prevent the transmission chain from rubbing against the outer track and play an effective guiding role for the transmission chain.

[0066] According to the present invention, the unloading and conveying device 60 further includes a blowing mechanism 64 for blowing and drying the surface of the filter screen 63. Figures 11 to 13 As shown, the purge mechanism 64 includes a fan 641 disposed at one end of the side baffle 61 and a strip air knife 643 connected to the fan 641 through an air pipe 644. The purge mechanism 64 is fixedly connected to one end close to the driven shaft through a mounting frame 642, and the air port of the strip air knife 643 is arranged to face the driven shaft, so that the filter screen 63 can be purged. In order to prevent the liquid from remaining on the surface of the filter screen 63 and affecting the filter pressing effect of the filter cake, before the filter press unloads the filter cake, the liquid on the surface of the filter screen is purged by the strip air knife 643, so that the surface of the filter screen 63 can be quickly dried, and then the filter cake can be received.

[0067] The height of the discharge and conveying device 60 according to the present invention is in the range of 0.3-0.6m. The discharge and conveying device 60 is placed under the filter press, which can realize the dry and wet separation of the filter press discharge and complete the conveying of the discharge. The use of the discharge and conveying device 60 can control the height of the filter press after the overall installation to within 4 meters. Compared with the traditional filter press, the installation base height of which is more than 8 meters and the height of the entire filter press room reaches 14-16m, which greatly reduces the installation height and floor space of the filter press.

[0068] In the actual working process, the unloading and conveying device 60 is placed under the filter press. The material to be filtered enters between the two filter cloths through the feeder between the two filter cloths. Under the filtering action of the filter plate of the filter press, the solid material is intercepted by the filter cloth and squeezed to form a filter cake. The filtrate falls after passing through the filter cloth and enters the liquid receiving cavity through the filter screen 63, and then is discharged through the liquid receiving cavity. Before the filter press unloads the filter cake, the liquid on the surface of the filter screen 63 is purged by the purge mechanism to quickly dry the surface of the filter screen 63. Afterwards, the filter press opens the plate after the filtration is completed, and unloads the filter cake by the movement of the filter cloth. The filter cake falls onto the filter screen 63, and then the filter screen 63 is driven to move by the transmission chain, so that the filter cake is conveyed to other conveying mechanisms, thereby realizing the solid-liquid separation of the material.

[0069] The unloading and conveying device 60 can efficiently separate the filter cake, filtrate and cleaning liquid of the filter press, and effectively prevent the filter cake from being wetted again by the filtrate and cleaning liquid. The unloading and conveying device 60 is small in size and low in height, which greatly reduces the installation height of the filter press and reduces the occupied space of the filter press. The filter screen 63 adopts a rigid support, which has good rigidity performance and can meet the requirements of rapid falling impact and accumulation of the filter cake. The transmission chain is provided with a protective baffle 612 and a protective groove 611, which not only enables the unloading and conveying device 60 to be applied to a variety of filter press environments, but also effectively prevents the filter cake or impurities flushed out from entering the chains on both sides and affecting the normal operation of the unloading and conveying device 60, thereby ensuring that the unloading and conveying device 60 can achieve long-term stable operation. In addition, the purge mechanism 64 purges the liquid on the surface of the filter screen before the filter press unloads the filter cake, which can quickly dry the surface of the filter screen 63, thereby effectively preventing the liquid from remaining on the surface of the filter screen 63 and affecting the filtration effect of the filter cake, which further enhances the dry-wet separation effect of the unloading and conveying device 60.

[0070] According to the filter press 100 with synchronous movement of the filter cloth of the present invention, the filter cloth driving device 20 can drive the filter cloth to move synchronously to completely separate the filter cake from the filter cloth and unload the mud, which significantly improves the efficiency of unloading the filter cake and cleaning the filter cloth of the filter press 100, and its control accuracy is high, which can ensure the long-term stable operation of the filter cloth. Under the action of the flattening and positioning device 30, the filter cloth 14 can remain relatively centered during the movement to avoid serious deviation, effectively avoiding leakage and mud running during the next filter pressing process, and the flattening and positioning device 30 can effectively flatten the filter cloth 14 when resetting, which is very conducive to enhancing the filter pressing effect of the filter cloth, thereby significantly enhancing the mud unloading effect of the filter press. In addition, during the movement of the filter cloth, the filter cloth cleaning device 40 works together with the flattening and positioning device 30 to perform high-pressure jet cleaning on the filter cloth 14, which can not only achieve fast, efficient and comprehensive cleaning of the filter cloth 14, ensure the long-term stability of the filtering performance of the filter cloth 14, but also greatly improve the cleaning efficiency of the filter cloth 14, and significantly enhance the cleaning effect of the filter cloth 14. In addition, the filter cloth cleaning device 40 has a high degree of automation, simple operation and control, and is easy to repair and maintain, which can not only extend the service life of the filter cloth, but also effectively reduce the performance degradation of the filter cloth. The unloading and conveying device 60 can efficiently separate the filter cake, filtrate and cleaning liquid of the filter press, effectively preventing the filter cake from being wetted again by the filtrate and cleaning liquid. The unloading and conveying device 60 is small in size and low in height, which greatly reduces the installation height of the filter press 100 and reduces the occupied space of the filter press 100.

[0071] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A filter press with synchronous movement of filter cloth, comprising: A plurality of filter plate units (10), filter cloths (14) being provided between adjacent filter plate units (10); A filter cloth drive device (20) for driving the filter cloth (14) to reciprocate, wherein the transmission gear assembly (24) in the filter cloth drive device (20) comprises a filter cloth drive shaft (21), a main synchronous drive shaft (22) arranged above the filter cloth drive shaft (21) and perpendicular to the axis of the filter cloth drive shaft (21), a radial ball bearing seat (241), and a first gear (242) and a second gear (243) mounted on the radial ball bearing seat (241) and meshing with each other through helical teeth, the radial ball bearing seat (241) being rotationally connected to the filter cloth drive shaft (21) and the main synchronous drive shaft (22), the first gear (242) being spline-connected to the main synchronous drive shaft (22), the first gear (242) being adaptively mounted to the main synchronous drive shaft (22), the main synchronous drive shaft (22) being able to drive the first gear (242) to rotate, and the first gear (242) being able to reciprocate along the axial direction of the main synchronous drive shaft (22); A flattening and positioning device (30) for a filter cloth (14), the filter cloth (14) bypassing the flattening and positioning device (30); and a filter cloth cleaning device (40); The filter plate unit (10) comprises a filter plate (11), and a first mounting frame (12) and a second mounting frame (13) are respectively fixed to the upper and lower ends of the filter plate (11); The flattening positioning device (30) comprises two flattening positioning shafts (31) mounted on the second mounting frame (13), the two flattening positioning shafts (31) being staggered and arranged in parallel, the flattening positioning shafts (31) being configured such that the diameters thereof decrease from the axial middle portion to both ends, a plurality of key grooves (32) extending in the axial direction are arranged on the outer surface of the flattening positioning shaft (31), the plurality of key grooves (32) being evenly distributed in the circumferential direction of the flattening positioning shaft (31), a groove (33) extending in a spiral shape is arranged on the outer circumferential surface of the flattening positioning shaft (31), the groove (33) being arranged to extend in a positive spiral shape and a negative spiral shape from the axial middle portion to both ends respectively; The filter cloth driving device (20) further comprises a transmission chain (25) arranged at both ends of the filter cloth driving shaft (21), sprockets (26) matched with the transmission chain (25) are respectively fixedly mounted at both ends of the filter cloth driving shaft (21), the filter cloth driving shaft (21) drives the transmission chain (25) to move via the sprockets (26), the upper and lower ends of the filter cloth (14) are respectively fixedly connected to a first cloth hanging rack (141) and a second cloth hanging rack (142), the filter cloth (14) bypasses the corresponding flattening and positioning shaft (31) and is respectively fixedly connected to both ends of the transmission chain (25) via the first cloth hanging rack (141) and the second cloth hanging rack (142), the filter cloth driving shaft (21) can drive the filter cloth (14) to reciprocate around the flattening and positioning shaft (31) via the transmission chain (25); The filter cloth cleaning device (40) comprises a cleaning water pipe (41) arranged below the flattening and positioning shaft (31); the cleaning water pipe (41) is mounted on the second mounting frame (13) and is parallel to the flattening and positioning shaft (31); a plurality of cleaning nozzles (42) are arranged on the cleaning water pipe (41) and are evenly spaced apart along the axial direction; the plurality of cleaning nozzles (42) are alternately aligned with the two flattening and positioning shafts (31) in sequence; the cleaning nozzles (42) are capable of spraying cleaning liquid onto the area of ​​the filter cloth (14) surrounding the flattening and positioning shaft (31), thereby cleaning the filter cloth (14); Wherein, the adjacent filter plate units (10) can be moved closer to each other to squeeze the material between the filter cloths (14) to form a filter cake, and separated after the squeezing is completed; the filter cloth driving device (20) can drive the corresponding filter cloth (14) to move synchronously to remove the filter cake; the flattening and positioning device (30) can flatten and position the filter cloth (14) during the movement of the filter cloth (14); and the filter cloth cleaning device (40) can work together with the flattening and positioning device (30) to clean the filter cloth (14).

2. The filter press according to claim 1, characterized in that The filter cloth driving device (20) comprises a filter cloth driving shaft (21) mounted on the first mounting frame (12), and a main synchronous driving shaft (22) arranged above each of the filter cloth driving shafts (21), the main synchronous driving shaft being in transmission connection with each of the filter cloth driving shafts (21), and the main synchronous driving shaft being capable of driving each of the filter cloth driving shafts (21) to rotate synchronously.

3. The filter press according to claim 1, characterized in that The spray water line formed by the cleaning nozzle (42) is tangent to the outer surface of the flattening positioning shaft (31), and can form a continuous spray on the filter cloth (14).

4. The filter press according to claim 1, characterized in that: It also comprises a discharge and conveying device (60) for receiving filtrate and filter cake, wherein the discharge and conveying device is arranged below the filter plate unit (10) and is capable of separating and outputting the filtrate and filter cake.

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