A step press belt filter

Abstract

The utility model discloses a step squeezing type belt filter press, including frame, the frame on installation can to the material of pressure filtration of pressure filtration be squeezed dewatering multistage pressure filtration device, the adjacent pressure filtration device between be provided with can the pressure filtration cake be broken wall and be broken wall device of loose, the discharge end of former stage pressure filtration device is located the feeding end of rear stage pressure filtration device top to form the step level layout, and the broken wall device is set in the discharge end below former stage pressure filtration device to accept the pressure filtration cake and the discharge port of broken wall device is set in the feeding end above rear stage pressure filtration device to supply broken wall pressure filtration material. The utility model discloses through to the sludge of phased step type carries out two times or above two times of squeezing, and introduces the sludge loose broken wall treatment between two adjacent times of squeezing, through squeezing - break broken wall - squeezing mode, to realize in the condition of not adding inorganic medicament to make traditional belt filter press sludge moisture content 80% or so bottleneck further reduce.

Description

Technical Field

[0001] This utility model belongs to the field of environmental protection technology, and in particular relates to the field of sludge dewatering and volume reduction technology, specifically a stepped pressing belt filter press. Background Technology

[0002] Belt filter presses are highly efficient equipment widely used in solid-liquid separation, including sludge dewatering in municipal wastewater treatment. The traditional dewatering principle of a belt filter press involves guiding flocculated sludge into the middle area formed by upper and lower filter belts. The sludge is held between the two belts and fed into several sets of S-shaped rollers. Tensioning cylinders tighten the upper and lower filter belts, creating pressure on the sludge within the S-shaped rollers, thus dewatering it. However, with increasingly stringent municipal sludge treatment policies, cost reduction and efficiency improvements at wastewater treatment plants, and higher requirements for incoming sludge from downstream treatment facilities, higher standards have been set for sludge moisture content.

[0003] Traditional belt filter presses are designed for single-pass, single-cycle filtration, meaning the sludge filtration process is a single-in, single-out process. Therefore, to reduce the moisture content of the sludge, conventional wastewater treatment plants typically increase the tensile tension of the mesh belts to indirectly increase the pressure exerted on the sludge by the upper and lower belts. However, this approach often introduces the following new problems: (1) When sludge is squeezed by external force, the sludge cake will form an egg-shell-like structure inside to resist the external pressure. At the same time, the dense outer layer formed by the squeeze will block the water from seeping out. The sludge cake forms a sugar core structure, making it difficult to fully discharge the water content inside the sludge through one filter press. Therefore, the effect of overcoming the sludge filter press resistance by simply increasing the tension of the mesh belt is limited.

[0004] (2) The sludge of the traditional belt filter press is compressed from the initial fluid state to the semi-solid state. The compression process is completed under the same set of filter belts and the same set tension. The mesh belt is limited by the fluid dynamic characteristics of the initial sludge in the first stage of the filtration process, so the overall tension cannot be too large.

[0005] (3) Existing belt filter presses all use cylinders to apply tension to the filter belt, thereby generating extrusion pressure on the sludge. However, the filter belts of belt filter presses are all made of polymer materials, which have a certain degree of tensile extensibility. While the cylinder increases the tension on the mesh belt, the mesh belt is often stretched, and the pore structure designed during the weaving process is destroyed. This greatly reduces the lifespan of the filter belt and makes the pores of the mesh belt unstable, thus affecting the water permeability of the filter belt and having a reverse effect on the dewatering and filtration of sludge. However, in order to further increase the moisture content, the cylinder must apply greater tension to the mesh surface to convert it into extrusion pressure on the sludge. These two contradictory directions make it impossible for traditional belt filter presses to further reduce the moisture content of sludge through tension.

[0006] Secondly, in this technical field, in order to further reduce the water content of sludge, inorganic chemical agents such as quicklime are used to chemically break down the sludge. However, this method not only increases the dry weight of the sludge and the treatment cost, but also affects the utilization value of the sludge in the subsequent resource recovery process. Utility Model Content

[0007] The purpose of this invention is to address the problems existing in the prior art by providing a stepped pressing belt filter press.

[0008] The objective of this utility model is achieved through the following technical solution: A stepped belt filter press includes a frame, characterized in that: a multi-stage filter press device capable of pressing and dewatering the material to be filtered is installed on the frame; a crushing and breaking device capable of crushing, breaking, and loosening the filter cake is arranged between adjacent filter press devices; the discharge end of the previous stage filter press device is located above the feed end of the next stage filter press device to form a stepped layout; the crushing and breaking device is located below the discharge end of the previous stage filter press device to receive the filter cake, and the discharge port of the crushing and breaking device is located above the feed end of the next stage filter press device to supply crushed and broken filter material.

[0009] The aforementioned crushing and breaking device includes a crushing chamber, a crushing and breaking mechanism, and a crushing and breaking motor. The crushing and breaking mechanism is arranged in the crushing chamber and the crushing and breaking motor is arranged outside the crushing chamber. The crushing and breaking mechanism is driven by the crushing and breaking motor.

[0010] The crushing and breaking mechanism includes at least two crushing and breaking shafts and crushing and breaking blades arranged vertically on the crushing and breaking shafts. The crushing and breaking blades on the two adjacent crushing and breaking shafts are arranged in a complementary staggered manner. The crushing and breaking blades on the two adjacent crushing and breaking shafts are interlocked with each other, and the rotation directions of the two adjacent crushing and breaking shafts are different, so as to crush and break the filter cake by rotational shearing.

[0011] The outlet side of the filter press is provided with an upper scraper corresponding to the upper filter belt and a lower scraper corresponding to the lower filter belt. The bottom of the inclined upper scraper abuts against the upper filter belt and the top of the inclined lower scraper abuts against the lower filter belt. The upper scraper is used to scrape the filter cake on the upper filter belt onto the lower filter belt and the lower scraper is used to scrape the filter cake off the lower filter belt and also serves as a guide.

[0012] The crushing and breaking device is equipped with a lower scraper corresponding to the lower filter belt. The top of the lower scraper abuts against the lower filter belt and the bottom of the lower scraper falls into the crushing and breaking device. The lower scraper is used to scrape the filter cake on the lower filter belt and guide it into the crushing and breaking device.

[0013] The filter press device is equipped with a filter press motor that drives both the upper and lower filter belts simultaneously. The filter press motor is located at the discharge end or the feed end of the filter press device.

[0014] The filter press is equipped with a pair of tensioning units, each tensioning unit including a tensioning roller and a pair of tensioning cylinders. The tensioning rollers are respectively arranged at the feed end or discharge end of the upper filter belt and the lower filter belt, which are independently distributed and connected end to end to form a ring structure. Tensioning cylinders are arranged at both ends of the tensioning rollers.

[0015] The filter press is equipped with a correction mechanism, which is respectively arranged on the upper part of the upper filter belt of the annular structure and the lower part of the lower filter belt of the annular structure. The correction mechanism includes a correction sensor, a correction roller, and a pair of correction cylinders respectively set at both ends of the correction roller. The correction cylinders are linked with the correction sensor signals, so that the correction cylinders perform correction actions based on the feedback signals of their corresponding correction sensors.

[0016] The filter press is equipped with a backwashing mechanism, which is arranged on the upper part of the annular filter belt and the lower part of the annular filter belt. The backwashing mechanism spanning the filter belt has several nozzles arranged inside along its length, and the nozzles are configured to face the filter belt surface.

[0017] The filter press device is equipped with a press roller assembly. The upper and lower filter belts are both wound on the press roller assembly, and the upper and lower filter belts at the press roller assembly have a running path with one end touching each other. The same press roller assembly consists of press rollers arranged in an S-shape with staggered vertical positions, or the same press roller assembly consists of two rows of press rollers arranged in parallel with corresponding vertical numbers and positions.

[0018] The rollers in the same roller group have the same diameter, or the rollers in the same roller group arranged along the material filtration direction have gradually smaller diameters.

[0019] Compared with the prior art, the present invention has the following advantages: This innovative invention utilizes a stepped belt filter press to perform two or more staged, stepped pressing processes on sludge. Between each pressing cycle, a sludge loosening and cell wall breaking treatment is introduced. This pressing-breaking-pressing process significantly reduces the moisture content of sludge beyond the approximately 80% limit of traditional belt filter presses. Simultaneously, it avoids the use of inorganic chemical agents such as quicklime and polyferric sulfate for cell wall breaking, thereby improving the calorific value and environmental performance of the produced sludge. Attached Figure Description

[0020] Appendix Figure 1 A schematic diagram of the structure of the stepped pressing belt filter press provided in Embodiment 1 of this utility model; Appendix Figure 2A schematic diagram of the combined structure of the filter press and the pulverizing and breaking device provided in Embodiment 1 of this utility model; Appendix Figure 3 A schematic diagram of the pulverizing and cell-wall breaking device provided in Embodiment 1 of this utility model; Appendix Figure 4 A schematic diagram of the backwashing mechanism provided in Embodiment 1 of this utility model; Appendix Figure 5 This is a schematic diagram of the combined structure of the filter press and the pulverizing and breaking device provided in Embodiment 2 of this utility model.

[0021] Wherein: 1—frame; 2—First-stage filter press unit; 20—First-stage filter press motor; 21A—First-stage upper filter belt; 21B—First-stage lower filter belt; 22—First-stage press roller assembly; 23A—First-stage upper scraper; 23B—First-stage lower scraper; 3—Pulverizing and breaking device; 31—Pulverizing chamber; 32—Pulverizing and breaking mechanism; 321—Pulverizing and breaking shaft; 322—Pulverizing and breaking blades; 33—Pulverizing and breaking motor; 4—Secondary filter press unit; 40—Secondary filter press motor; 41A—Secondary upper filter belt; 41B—Secondary lower filter belt; 42—Secondary press roller assembly; 43A—Secondary upper scraper; 43B—Secondary lower scraper; 5—Backwashing mechanism; 51—Sprayer head; 6—Correction mechanism; 61—Correction sensor; 62—Correction roller; 63—Correction cylinder; 7—Tensioning unit; 71—Tensioning roller; 72—Tensioning cylinder. Detailed Implementation

[0022] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present invention will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and therefore their detailed description will be omitted.

[0023] The terms “a,” “one,” “the,” and “the” are used to indicate the existence of one or more elements / components / etc.; the terms “including” and “having” are used to indicate an open-ended meaning of inclusion and that other elements / components / etc. may exist in addition to the listed elements / components / etc.

[0024] like Figure 1-5As shown: A stepped belt filter press includes a frame 1, a multi-stage filter press, a crushing and breaking device 3, a backwashing mechanism 5, a deviation correction mechanism 6, and a tensioning unit 7. The multi-stage filter press is installed on the frame 1 to press and dewater the material to be filtered. The crushing and breaking device 3, which can crush, break, and loosen the filter cake, is arranged between adjacent filter presses. The discharge end of the previous stage filter press is located above the feed end of the next stage filter press to form a stepped layout. The crushing and breaking device 3 is located below the discharge end of the previous stage filter press to receive the filter cake, and the discharge port of the crushing and breaking device 3 is located above the feed end of the next stage filter press to supply the crushed and broken filter material.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 5 As shown, the crushing and breaking device 3 includes a crushing chamber 31, a crushing and breaking mechanism 32, and a crushing and breaking motor 33. The crushing and breaking mechanism 32 is arranged in the crushing chamber 31 and the crushing and breaking motor 33 is arranged outside the crushing chamber 31. The crushing and breaking mechanism 32 is driven by the crushing and breaking motor 33. The crushing and breaking mechanism 32 includes at least two crushing and breaking shafts 321 and crushing and breaking blades 322 arranged vertically on the crushing and breaking shafts 321. The crushing and breaking blades 322 on the two adjacent crushing and breaking shafts 321 form a complementary staggered arrangement. The crushing and breaking blades 322 on the two adjacent crushing and breaking shafts 321 are interlocked and the rotation directions of the two adjacent crushing and breaking shafts 321 are different, so as to crush and break the filter cake by rotational shearing.

[0026] like Figure 1 , Figure 2 , Figure 5 As shown, an upper scraper corresponding to the upper filter belt and a lower scraper corresponding to the lower filter belt are arranged on the outlet side of the filter press device. The bottom of the inclined upper scraper abuts against the upper filter belt, and the top of the inclined lower scraper abuts against the lower filter belt. The upper scraper is used to scrape the filter cake on the upper filter belt onto the lower filter belt, and the lower scraper is used to scrape the filter cake off the lower filter belt and also serves as a guide. A lower scraper corresponding to the lower filter belt is arranged at the pulverizing and breaking device 3. The top of the lower scraper abuts against the lower filter belt, and the bottom of the lower scraper falls into the pulverizing and breaking device 3. The lower scraper is used to scrape the filter cake off the lower filter belt and guide it into the pulverizing and breaking device 3.

[0027] like Figure 1 , Figure 2 , Figure 5As shown, the filter press device is equipped with a filter press motor that simultaneously drives the upper and lower annular filter belts. The filter press motor is located at either the discharge or feed end of the filter press device. The filter press device is equipped with a press roller assembly. Both the upper and lower filter belts are wound around the press roller assembly, and the upper and lower filter belts at the press roller assembly have a running path where one end is in contact with the other. The same press roller assembly consists of press rollers arranged in an S-shape with staggered vertical alignment, or the same press roller assembly consists of two rows of press rollers arranged in parallel with corresponding vertical numbers and positions. The press rollers in the same press roller assembly have the same diameter, or the diameter of the press rollers in the same press roller assembly arranged along the material filtration direction gradually decreases.

[0028] like Figure 1 , Figure 2 , Figure 5 As shown, tensioning units 7 are arranged in pairs on the filter press device. Each tensioning unit 7 includes a tensioning roller 71 and a pair of tensioning cylinders 72. The tensioning rollers 71 are respectively arranged at the feed end or discharge end of the upper filter belt and the lower filter belt, which are independently distributed and connected end to end to form a ring structure. Tensioning cylinders 72 are arranged at both ends of the tensioning rollers 71.

[0029] like Figure 1 , Figure 2 , Figure 5 As shown, a correction mechanism 6 is configured on the filter press device. The correction mechanism 6 is respectively arranged on the upper part of the upper filter belt of the annular structure and the lower part of the lower filter belt of the annular structure. The correction mechanism 6 includes a correction sensor 61, a correction roller 62, and a pair of correction cylinders 63 respectively arranged at both ends of the correction roller 62. The correction cylinders 63 are linked with the correction sensor 61, so that the correction cylinders 63 perform correction actions based on the feedback signals of their corresponding correction sensors 61.

[0030] like Figure 1 , Figure 2 , Figure 5 As shown, a backwashing mechanism 5 is configured on the filter press device. The width of the backwashing mechanism 5 is equal to that of each filter belt. The backwashing mechanism 5 is respectively arranged on the upper part of the upper filter belt of the annular structure and the lower part of the lower filter belt of the annular structure. Several nozzles 51 are arranged inside the backwashing mechanism 5 that spans the filter belt along the length extension direction. The nozzles 51 are configured to face the filter belt surface. Example 1

[0031] like Figure 1-4As shown, a stepped pressing belt filter press includes a frame 1, a primary filter press 2, a crushing and breaking device 3, a secondary filter press 4, a backwashing mechanism 5, a deviation correction mechanism 6, and a tensioning unit 7. The frame 1 is used to form the equipment structure and fix the mechanism. The primary filter press 2, the crushing and breaking device 3, and the secondary filter press 4 are respectively installed on the frame 1. The primary filter press 2 and the secondary filter press 4 are each equipped with a backwashing mechanism 5, a deviation correction mechanism 6, a tensioning unit 7 arranged in pairs, as well as a scraper, a pressing roller group, and a filter press motor.

[0032] like Figure 2-4 As shown, the primary filter press device 2 includes a primary filter press motor 20, an upper primary filter belt 21A and a lower primary filter belt 21B that are independently distributed and connected end-to-end to form a ring structure, a primary press roller assembly 22, an upper primary scraper 23A arranged on the upper primary filter belt 21A, and a lower primary scraper 23B arranged on the lower primary filter belt 21B. The primary press roller assembly 22 consists of several primary press rollers arranged in parallel to each other and staggered vertically in an S-shape. The primary press rollers are configured such that their diameter gradually decreases along the running direction of the upper primary filter belt 21A and the lower primary filter belt 21B on the primary press roller assembly 22. In this embodiment, there are a total of 5 primary press rollers. The upper primary filter belt 21A and the lower primary filter belt 21B are both wound on the primary press roller assembly 22, and the upper primary filter belt 21A and the lower primary filter belt 21B have a section of running path that can fit together at the primary press roller assembly 22. Downstream of the primary press roller assembly 22, a primary upper scraper 23A for peeling the filter cake is installed close to the primary upper filter belt 21A, and a primary lower scraper 23B for peeling the filter cake is installed close to the primary lower filter belt 21B. A primary filter press motor 20 can synchronously drive the primary upper filter belt 21A and the primary lower filter belt 21B to rotate. A tensioning unit 7, a correction mechanism 6, and a backwashing mechanism 5 are installed on the running paths of the primary upper filter belt 21A and the primary lower filter belt 21B. The tensioning unit 7 includes a tensioning roller 71 and a pair of tensioning cylinders 72. The tensioning rollers 71 are respectively arranged at the feed end or discharge end of the upper and lower filter belts, which are independently distributed and connected end to end to form a ring structure. Both ends of the tensioning rollers 71 are A tensioning cylinder 72 is arranged, which can drive the tensioning roller 71 to move left and right; the correction mechanism 6 is arranged on the upper part of the annular filter belt and the lower part of the annular filter belt respectively; the correction mechanism 6 includes a correction sensor 61, a correction roller 62, and a pair of correction cylinders 63 respectively arranged at both ends of the correction roller 62. The correction cylinders 63 are linked with the correction sensor 61, so that the correction cylinders 63 perform correction actions based on the feedback signals of their corresponding correction sensors 61; the backwashing mechanism 5 is arranged on the upper part of the annular filter belt and the lower part of the annular filter belt respectively. The backwashing mechanism 5, which spans the filter belt, has a number of nozzles 51 arranged along the length extension direction inside, and the nozzles 51 are configured to face the filter belt surface.

[0033] like Figure 3 As shown, a crushing and breaking device 3 for crushing, breaking and loosening the primary filter material is provided downstream of the primary scraper 23B. The crushing and breaking device 3 includes a crushing chamber 31 for collecting the primary filter material, a crushing and breaking mechanism 32 disposed in the crushing chamber 31 and crushing, breaking and loosening the primary filter material by rotational shearing, and a crushing and breaking motor 33 for driving the crushing and breaking mechanism 32. A funnel-shaped discharge port for discharging the loosened filter material is provided at the bottom of the crushing chamber 31. The crushing and breaking mechanism 32 includes at least two parallel crushing and breaking shafts 321 and crushing and breaking blades 322 arranged vertically on the crushing and breaking shafts 321. The crushing and breaking shafts 321 are connected to the crushing and breaking motor 33. The crushing and breaking blades 322 on the two adjacent crushing and breaking shafts 321 are arranged in a complementary staggered manner. The crushing and breaking blades 322 on the two adjacent crushing and breaking shafts 321 are interlocked and the rotation directions of the two adjacent crushing and breaking shafts 321 are opposite, so as to crush and break the filter cake by rotational shearing.

[0034] like Figure 2-4As shown, the secondary filter press device 4 is located downstream of the feed inlet of the crushing and breaking device 3. It is used to perform secondary pressing on the crushed and broken filter material. The secondary filter press device 4 includes a secondary filter press motor 40 that can synchronously drive the rotation of the secondary upper filter belt 41A and the secondary lower filter belt 41B; the secondary upper filter belt 41A and the secondary lower filter belt 41B, which are independently distributed and connected end to end to form a ring structure; a secondary press roller group 42 composed of several parallel secondary press rollers; and a secondary press roller group 42 located downstream of the secondary press roller group 42 and closely attached to the secondary upper filter belt 41A. The secondary upper scraper 43A with 41A and the secondary lower filter belt 41B are both wound on the secondary press roller group 42. The secondary upper filter belt 41A and the secondary lower filter belt 41B are sandwiched by two rows of secondary press rollers. The two rows of secondary press rollers are configured to be close to each other and provide extrusion pressure. The secondary upper filter belt 41A and the primary lower filter belt 41B have a section of mutually close running path at the secondary press roller group 42. In the first embodiment, there are a total of 12 secondary press rollers in the upper and lower rows. The secondary filter press 4 is equipped with a tensioning unit 7, a correction mechanism 6, and a backwashing mechanism 5 along the running paths of the secondary upper filter belt 41A and the secondary lower filter belt 41B. The tensioning unit 7 includes a tensioning roller 71 and a pair of tensioning cylinders 72. The tensioning rollers 71 are independently distributed at the feed end or discharge end of the upper and lower filter belts, respectively, and connected end-to-end in a ring structure. Tensioning cylinders 72 are arranged at both ends of the tensioning rollers 71, which can drive the tensioning rollers 71 to move left and right. The correction mechanism 6 is arranged on the upper part of the ring structure of the upper filter belt and the ring... The lower part of the filter belt has a ring-shaped structure; the correction mechanism 6 includes a correction sensor 61, a correction roller 62, and a pair of correction cylinders 63 respectively disposed at both ends of the correction roller 62. The correction cylinders 63 are linked with the correction sensor 61, so that the correction cylinders 63 perform correction actions based on the feedback signals of their corresponding correction sensors 61; the backwashing mechanism 5 is respectively arranged on the upper part of the annular structure of the upper filter belt and the lower part of the annular structure of the lower filter belt. The backwashing mechanism 5, which spans the filter belt, has a number of nozzles 51 arranged inside along the length extension direction. The nozzles 51 are configured to face the filter belt surface.

[0035] To further illustrate, the specific working process is as follows: The tensioning unit 7 in the primary filter press 2 and the secondary filter press 4 tensions the corresponding primary upper filter belt 21A, primary lower filter belt 21B, secondary upper filter belt 41A, and secondary lower filter belt 41B respectively via tensioning rollers 71. The material to be pressed (sludge) is pumped into the upper end of the primary upper filter belt 21A of the primary filter press 2 through a pipeline. The primary filter press motor 20 drives the primary upper filter belt 21A to rotate, feeding the sludge into the wedge-shaped pre-pressing zone formed by the primary upper filter belt 21A and the primary lower filter belt 21B. The sludge is held by the primary upper filter belt 21A and the primary lower filter belt 21B and fed into the primary pressing roller group 22, which consists of five primary pressing rollers, completing the primary pressing. The resulting sludge cake is scraped off and separated by the primary upper scraper 23A and the primary lower scraper 23B, falling into the crushing chamber 31 of the crushing and breaking device 3. It is then crushed by rotation. After the cell wall breaking mechanism crushes and loosens the primary filter cake, it continues to fall onto the platform of the secondary lower filter belt 41B. Driven by the secondary filter press motor 40, the crushed and broken filter material is clamped by the secondary upper filter belt 41A and the secondary lower filter belt 41B and fed into two rows of secondary press rollers that are parallel to each other in number and position. The bottom row of secondary press rollers lifts up and contacts the upper row of secondary press rollers to provide extrusion pressure to the crushed and broken filter material. The secondary filter cake produced by the secondary pressing is separated and detached by the scrapers of the secondary upper scraper 43A and the secondary lower scraper 43B and falls to the collection, completing the final pressing. Example 2

[0036] like Figure 5 The step-press belt filter press shown in Embodiment 2 differs from the step-press belt filter press provided in Embodiment 1 in that the arrangement of the secondary pressing rollers in the secondary pressing roller group 42 is different. The secondary pressing roller group 42 is composed of several secondary pressing rollers 42 arranged in an S-shape with staggered vertical alignment.

[0037] The following comparative experiment uses a stepped pressing belt filter press provided in Example 1. Only the first-stage filter press device 2 of the stepped pressing belt filter press provided by this utility model is used as a traditional belt filter press for comparison, and only two-stage pressing is used without turning on the crushing and breaking device 3 for comparison. The results of the comparative experiment are shown in Table 1. Under the same conditions of sludge type, PAM flocculant dosage and sludge feed, the stepped pressing belt filter press can further reduce the moisture content of the sludge by about 6 percentage points on the basis of the traditional single-pass single-press sludge moisture content. However, it is obvious that by using stepped pressing and crushing in combination, the crushing and breaking effect can further reduce the moisture content of the sludge by about 12 percentage points compared with the traditional single-pass single-press sludge.

[0038] Table 1 Comparison of Filtration Effects: Experimental Results

[0039] In this embodiment of the invention, the term "multiple" refers to two or more, unless otherwise explicitly defined. The terms "install," "connect," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention based on the specific circumstances.

[0040] In the description of the embodiments of this utility model, it should be understood that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0041] In this specification, the terms "an embodiment," "a preferred embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The above embodiments are only for illustrating the technical concept of this utility model and should not be construed as limiting the scope of protection of this utility model. Any modifications made to the technical solution based on the technical concept proposed by this utility model shall fall within the scope of protection of this utility model. Technologies not covered by this utility model can be implemented by existing technologies.

Claims

1. A stepped pressing type belt filter press, comprising a frame (1), characterized in that: The frame (1) is equipped with a multi-stage filter press capable of pressing and dewatering the filter material. Between adjacent filter presses, there is a crushing and breaking device (3) capable of crushing, breaking and loosening the filter cake. The discharge end of the first-stage filter press is located above the feed end of the second-stage filter press to form a stepped layout. The crushing and breaking device (3) is located below the discharge end of the first-stage filter press to receive the filter cake, and the discharge port of the crushing and breaking device (3) is located above the feed end of the second-stage filter press to supply crushed and broken filter material.

2. The stepped pressing belt filter press according to claim 1, characterized in that: The crushing and breaking device (3) includes a crushing chamber (31), a crushing and breaking mechanism (32) and a crushing and breaking motor (33). The crushing and breaking mechanism (32) is arranged in the crushing chamber (31) and the crushing and breaking motor (33) is arranged outside the crushing chamber (31). The crushing and breaking mechanism (32) is driven by the crushing and breaking motor (33).

3. The stepped pressing belt filter press according to claim 2, characterized in that: The crushing and breaking mechanism (32) includes at least two crushing and breaking shafts (321) and crushing and breaking blades (322) arranged vertically on the crushing and breaking shafts (321). The crushing and breaking blades (322) on the two adjacent crushing and breaking shafts (321) are arranged in a complementary staggered manner. The crushing and breaking blades (322) on the two adjacent crushing and breaking shafts (321) are interlocked and the rotation directions of the two adjacent crushing and breaking shafts (321) are different, so as to crush and break the filter cake by rotation shearing.

4. The stepped pressing belt filter press according to any one of claims 1-3, characterized in that: The outlet side of the filter press is provided with an upper scraper corresponding to the upper filter belt and a lower scraper corresponding to the lower filter belt. The bottom of the inclined upper scraper abuts against the upper filter belt and the top of the inclined lower scraper abuts against the lower filter belt. The upper scraper is used to scrape the filter cake on the upper filter belt onto the lower filter belt and the lower scraper is used to scrape the filter cake off the lower filter belt and also serves as a guide.

5. The stepped pressing belt filter press according to any one of claims 1-3, characterized in that: The filter press device is equipped with a filter press motor that drives both the upper and lower filter belts simultaneously. The filter press motor is located at the discharge end or the feed end of the filter press device.

6. The stepped pressing belt filter press according to any one of claims 1-3, characterized in that: The filter press is equipped with a pair of tensioning units (7). The tensioning unit (7) includes a tensioning roller (71) and a pair of tensioning cylinders (72). The tensioning rollers (71) are arranged at the feed end or discharge end of the upper filter belt and the lower filter belt, which are independently distributed and connected end to end to form a ring structure. Tensioning cylinders (72) are arranged at both ends of the tensioning rollers (71).

7. The stepped pressing belt filter press according to any one of claims 1-3, characterized in that: The filter press is equipped with a correction mechanism (6), which is arranged on the upper part of the upper filter belt of the annular structure and the lower part of the lower filter belt of the annular structure. The correction mechanism (6) includes a correction sensor (61), a correction roller (62), and a pair of correction cylinders (63) respectively set at both ends of the correction roller (62). The correction cylinders (63) are linked with the correction sensor (61) to perform correction actions based on the feedback signal of their corresponding correction sensor (61).

8. The stepped pressing belt filter press according to any one of claims 1-3, characterized in that: The filter press is equipped with a backwashing mechanism (5). The backwashing mechanism (5) is arranged on the upper part of the upper filter belt of the annular structure and the lower part of the lower filter belt of the annular structure. A number of nozzles (51) are arranged inside the backwashing mechanism (5) that spans the filter belt along the length extension direction. The nozzles (51) are configured to face the filter belt surface.

9. The stepped pressing belt filter press according to any one of claims 1-3, characterized in that: The filter press device is equipped with a press roller assembly. The upper and lower filter belts are both wound on the press roller assembly, and the upper and lower filter belts at the press roller assembly have a running path with one end touching each other. The same press roller assembly consists of press rollers arranged in an S-shape with staggered vertical positions, or the same press roller assembly consists of two rows of press rollers arranged in parallel with corresponding vertical numbers and positions.

10. The stepped pressing belt filter press according to claim 9, characterized in that: The rollers in the same roller group have the same diameter, or the rollers in the same roller group arranged along the material filtration direction have gradually decreasing diameters.

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