Filter belt tensioning device for belt filter press and belt filter press

Abstract

The utility model provides a filter belt tensioning device for a belt filter press and the belt filter press, the filter belt tensioning device comprises a rack, a tensioning roller and a tensioning roller adjusting unit, and the tensioning roller is used for supporting a filter belt of the belt filter press and is rotatably connected to the rack; the tensioning roller adjusting unit can drive the tensioning roller to move relative to the rack, the tensioning roller adjusting unit comprises a first magnetic attraction structure and a second magnetic attraction structure which can be attracted by means of magnetic force, and the first magnetic attraction structure is movably connected to the rack in the direction from the first magnetic attraction structure to the second magnetic attraction structure or away from the second magnetic attraction structure. The first magnetic attraction structure is connected to the tensioning roller to drive the tensioning roller to move, the second magnetic attraction structure is connected to the rack, when the second magnetic attraction structure and the first magnetic attraction structure are attracted, the tensioning roller is located at the tensioning position, so that the filter belt is tensioned, and the tensioning roller is pushed to move relative to the rack through magnetic attraction between the first magnetic attraction structure and the second magnetic attraction structure; and the operation and maintenance cost of the belt filter press is reduced.

Description

Technical Field

[0001] The present disclosure relates to the technical field of sewage treatment, and in particular to a filter belt tensioning device for a belt filter press and a belt filter press. Background Art

[0002] At present, in the sewage treatment process of sewage treatment plants, belt filter presses are generally used for treatment. Among them, belt filter presses have attracted much attention due to their large processing capacity and high degree of automation.

[0003] During the operation of the belt filter press, the tensioning cylinder and the deviation correction cylinder need to work continuously. The above cylinders need the air compressor to work continuously to provide them with compressed gas, which consumes a lot of energy and produces noise pollution during operation, affecting the working environment. For example, the belt filter press includes upper and lower filter belts, which are tightened by upper and lower tensioning cylinders respectively, and the corresponding tensioning cylinders are provided with compressed air by the air compressor.

[0004] During the daily operation of the equipment, the wear caused by the frequent expansion and contraction of the cylinder and the harsh operating environment of the belt filter press (such as humid air or acidic moisture) cause the cylinder to age easily, which seriously affects the operation and maintenance cost of the belt filter press. Utility Model Content

[0005] The main purpose of the present disclosure is to provide a filter belt tensioning device for a belt filter press and a belt filter press, so as to reduce the operation and maintenance cost of the belt filter press.

[0006] To achieve the above objectives, the present disclosure provides at least the following technical solutions:

[0007] In one aspect of the present disclosure, there is provided a filter belt tensioning device for a belt filter press, the filter belt tensioning device comprising a frame, a tensioning roller and a tensioning roller adjustment unit, the tensioning roller being used to support the filter belt of the belt filter press and being rotatably connected to the frame; the tensioning roller adjustment unit being capable of driving the tensioning roller to move relative to the frame, the tensioning roller adjustment unit comprising a first magnetic attraction structure and a second magnetic attraction structure which can be attracted by magnetic force, the first magnetic attraction structure being movably connected to the frame along a direction in which the first magnetic attraction structure approaches or moves away from the second magnetic attraction structure, the first magnetic attraction structure being connected to the tensioning roller to drive the tensioning roller to move, the second magnetic attraction structure being connected to the frame, and when the second magnetic attraction structure is attracted to the first magnetic attraction structure, the tensioning roller is located in a tensioning position, so that the filter belt is tensioned.

[0008] According to an exemplary embodiment of the present disclosure, at least one of the first magnetic attraction structure and the second magnetic attraction structure comprises a magnet.

[0009] Optionally, the first magnetic attraction structure includes a bearing, the bearing is connected to the frame, and the end of the tensioning roller is rotatably connected to the bearing.

[0010] Specifically, the first magnetic structure also includes a guide member, which is movably connected to the frame along the direction in which the first magnetic structure approaches or moves away from the second magnetic structure, and the bearing is connected to the end of the guide member facing the second magnetic structure.

[0011] Further, the guide member includes a guide rod extending in a direction from the first magnetic structure to the second magnetic structure or away from the first magnetic structure, and the first magnetic structure also includes a connecting block, which is fixed to the end of the guide rod facing the second magnetic structure, and the connecting block is located between the bearing and the second magnetic structure, and the connecting block has a fitting surface that can fit with the second magnetic structure, and when the fitting surface fits with the second magnetic structure, the tensioning roller is located in the tensioning position.

[0012] According to an exemplary embodiment of the present disclosure, the second magnetic attraction structure includes a permanent magnetic suction cup, and one of the bearing and the connecting block includes a metal part that can be combined with the magnetic attraction force of the permanent magnetic suction cup.

[0013] Optionally, the second magnetic structure includes a permanent magnetic suction cup and an adjusting member for adjusting the position of the permanent magnetic suction cup, the adjusting member is connected to the frame, and one end of the adjusting member facing the first magnetic structure can extend or retract toward the first magnetic structure relative to the frame, and the permanent magnetic suction cup is connected to the one end.

[0014] Specifically, the adjusting member includes a screw rod assembly, which can extend in a direction parallel to the first magnetic structure toward or away from the second magnetic structure, and one end of the screw rod assembly facing the first magnetic structure can be extended or retracted relative to the frame; or, the adjusting member includes a telescopic cylinder, which can extend in a direction parallel to the first magnetic structure toward or away from the second magnetic structure, and one end of the telescopic cylinder facing the first magnetic structure can be extended or retracted relative to the frame.

[0015] Furthermore, the filter belt tensioning device also includes a support roller, which is rotatably connected to the frame, and is located on the side of the tensioning roller away from the second magnetic attraction structure. The support roller and the tensioning roller are arranged parallel to each other and spaced apart, and the filter belt is wound around the support roller and the tensioning roller.

[0016] In another aspect of the present disclosure, a belt filter press is provided, comprising a filter belt, a main frame and the filter belt tensioning device as described above, wherein the filter belt tensioning device is connected to the main frame, and the filter belt is wound around the tensioning roller.

[0017] The filter belt tensioning device for a belt filter press and the belt filter press provided by the present invention have at least the following beneficial effects: the present invention promotes the movement of the tensioning roller relative to the frame through the magnetic attraction between the first magnetic attraction structure and the second magnetic attraction structure, thereby tightening the filter belt. Compared with the technical solution of tightening the filter belt by using a cylinder in the prior art, there is no need for contact friction between the cylinder body and the piston rod, thereby increasing the service life of the filter belt tensioning device and reducing the operation and maintenance cost of the belt filter press. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or other objects and advantages of the present disclosure will become more apparent through the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0019] Figure 1 A schematic structural diagram of a filter belt tensioning device for a belt filter press provided as an exemplary embodiment of the present disclosure.

[0020] Figure 2 for Figure 1 Schematic diagram of the structure of the belt tensioning device of the belt filter press after removing the tensioning roller.

[0021] Figure 3 for Figure 1 Schematic diagram of the local structure of the bearing seat and the tensioning roller adjustment unit in the combined state.

[0022] Description of reference numerals:

[0023] 1. Tension roller; 2. Bearing;

[0024] 3. Permanent magnetic chuck; 4. Guide piece;

[0025] 5. Adjustment parts; 6. Support rollers;

[0026] 7. Frame; 8. Connection block;

[0027] 10. A first magnetic attraction structure; 20. A second magnetic attraction structure. DETAILED DESCRIPTION

[0028] Example embodiments will now be described more fully with reference to the accompanying drawings. However, it should not be understood that the implementation of the present disclosure is limited to the embodiments set forth herein. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0029] The present disclosure provides a belt filter press for treating sewage. The belt filter press includes a frame and a hopper arranged on the frame. Materials enter the belt filter press from the hopper and fall onto the lower filter belt under the action of gravity. First, the materials will be initially separated under the action of gravity, and part of the water in the materials will be separated out through the pores of the lower filter belt; then, the materials will continue to move with the lower filter belt until the upper filter belt partially overlaps with the lower filter belt, and the water in the materials will be further separated out under the squeezing action of the upper filter belt and the lower filter belt.

[0030] The above-mentioned belt filter press includes a filter belt tensioning device for adjusting the upper filter belt and / or the lower filter belt. The filter belt tensioning device can support the upper filter belt or the lower filter belt and adjust the tension of the upper filter belt when necessary to improve the working reliability of the belt filter press.

[0031] Since both the upper filter belt and the lower filter belt need to be adjusted by the filter belt tensioning device, the upper filter belt and the lower filter belt in this embodiment are collectively referred to as filter belts, that is, the filter belt provided in this embodiment includes an upper filter belt and a lower filter belt.

[0032] In one aspect of the present disclosure, a filter belt tensioning device for a belt filter press is provided to adjust the tension of the filter belt.

[0033] Reference Figures 1 to 3 In this embodiment, the filter belt tensioning device includes a frame 7, a tensioning roller 1 and a tensioning roller adjustment unit. The tensioning roller 1 is used to support the filter belt of the belt filter press and is rotatably connected to the frame 7. The tensioning roller adjustment unit can drive the tensioning roller 1 to move relative to the frame 7, thereby adjusting the tension of the filter belt.

[0034] Reference Figure 3 The tensioning roller adjustment unit includes a first magnetic structure 10 and a second magnetic structure 20 that can be attracted by magnetic force. The first magnetic structure 10 is movably connected to the frame 7 along the direction of the first magnetic structure 10 approaching or moving away from the second magnetic structure 20. The first magnetic structure 10 is connected to the tensioning roller 1 to drive the tensioning roller 1 to move, and the second magnetic structure 20 is connected to the frame 7. When the second magnetic structure 20 is attracted to the first magnetic structure 10, the tensioning roller 1 is located in the tensioning position, so that the filter belt is tightened.

[0035] In the present embodiment, since the first magnetic structure 10 moves in the direction of approaching or moving away from the second magnetic structure 20, the first magnetic structure 10 and the second magnetic structure 20 can be attracted together by magnetic force. When the first magnetic structure 10 and the second magnetic structure 20 are attracted together, the tensioning roller 1 is located in the tensioning position. When the first magnetic structure 10 and the second magnetic structure 20 are not attracted together, under the action of the filter belt, the first magnetic structure 10 and the second magnetic structure 20 are spaced apart, and the tensioning roller 1 is located in the untensioned state. In this way, the filter belt tensioning device provided in the present embodiment can use the magnetic force to make the tensioning roller 1 located in the tensioning position, thereby improving the reliability of the belt filter press.

[0036] Furthermore, in this embodiment, the magnetic attraction between the first magnetic attraction structure 10 and the second magnetic attraction structure 20 is used to push the tensioning roller 1 to move relative to the frame 7, thereby tightening the filter belt. Compared with the technical solution of using a cylinder to tighten the filter belt in the prior art, there is no need for contact friction between the cylinder body and the piston rod, thereby increasing the service life of the filter belt tensioning device and reducing the operation and maintenance cost of the belt filter press.

[0037] In an exemplary embodiment of the present disclosure, at least one of the first magnetic attraction structure 10 and the second magnetic attraction structure 20 includes a magnet. As an example, the second magnetic attraction structure 20 includes a magnet, and optionally, the magnet includes a permanent magnet or an electromagnet, and the first magnetic attraction structure 10 includes a metal part that can be magnetically attracted by a magnet, for example but not limited to, the first magnetic attraction structure 10 includes an iron part, a cobalt part, a nickel part, or other alloy parts.

[0038] In an optional embodiment, the first magnetic attraction structure 10 and the second magnetic attraction structure 20 both include magnets, which may be permanent magnets or electromagnets, but are not limited thereto. In addition, the first magnetic attraction structure 10 includes a magnet, which may be a permanent magnet or an electromagnet, and the second magnetic attraction structure 20 includes a metal part that can be magnetically attracted by a magnet, for example but not limited to, the second magnetic attraction structure 20 includes an iron part, a cobalt part, a nickel part, or other alloy parts.

[0039] For the convenience of description, this embodiment is described by taking the second magnetic attraction structure 20 including a magnet as an example, but the present invention is not limited thereto.

[0040] Continue to refer to Figures 1 to 3In this embodiment, the first magnetic attraction structure 10 includes a bearing 2, the bearing 2 is connected to the frame 7, and the end of the tensioning roller 1 is rotatably connected to the bearing 2. As an example, the bearing 2 includes an iron part, a cobalt part or a nickel part, or other metal parts that can be magnetically attracted by a magnet, so that the second magnetic attraction structure 20 can generate a magnetic attraction force on the bearing 2, so that the bearing 2 is close to the second magnetic attraction structure 20. When the second magnetic attraction structure 20 and the bearing 2 are attracted, the tensioning roller 1 can be in a tensioning position, and the filter belt can be in a tensioned state at this time, but it is not limited to this.

[0041] Furthermore, in order to improve the movement accuracy of the bearing 2 and avoid shaking of the bearing 2 during movement, the first magnetic structure 10 also includes a guide member 4, which is movably connected to the frame 7 along the direction of the first magnetic structure 10 approaching or moving away from the second magnetic structure 20, and the bearing 2 is connected to the end of the guide member 4 facing the second magnetic structure 20.

[0042] The present disclosure provides a guide member 4 for guiding the movement of the bearing 2, thereby improving the movement accuracy of the bearing 2, thereby improving the movement reliability of the tensioning roller adjustment unit, and also improving the use reliability of the filter belt tensioning device.

[0043] Specifically, continue to refer to Figure 3 In this embodiment, the guide member 4 includes a guide rod extending in a direction of approaching or moving away from the first magnetic structure 10 to the second magnetic structure 20, and a through hole for inserting the guide member 4 is provided on the frame 7, and the guide member 4 can be slidably disposed in the through hole.

[0044] In order to improve the reliability of the first magnetic attraction structure 10 , the extension length of the guide rod is greater than the moving stroke of the guide rod to avoid accidental separation of the guide rod from the frame 7 , thereby improving the reliability of the first magnetic attraction structure 10 .

[0045] It is understandable that the guide member 4 can also be a guide slider (not shown), and the frame 7 can also be provided with a guide groove matching the guide slider, and the guide groove extends along the first magnetic structure 10 toward or away from the second magnetic structure 20. The guide slider moves in the guide groove, driving the bearing 2 to move relative to the frame 7 to adjust the tension of the filter belt.

[0046] Continue to refer to Figure 3 In order to further improve the reliability of the filter belt tensioning device, the first magnetic structure 10 also includes a connecting block 8, which is fixed to the end of the guide member 4 facing the second magnetic structure 20, and the connecting block 8 is located between the bearing 2 and the second magnetic structure 20. The connecting block 8 has a fitting surface that can fit with the second magnetic structure 20. When the fitting surface fits with the second magnetic structure 20, the tensioning roller 1 is located in the tensioning position.

[0047] In this embodiment, the fitting surface of the connecting block 8 can fit with the second magnetic structure 20, thereby increasing the contact area between the first magnetic structure 10 and the second magnetic structure 20, thereby further improving the connection reliability between the first magnetic structure 10 and the second magnetic structure 20.

[0048] As an example, the second magnetic attraction structure 20 includes a magnet, and optionally, the magnet includes a permanent magnet or an electromagnet, and at least one of the connecting block 8 and the bearing 2 includes a metal part that can be magnetically attracted by a magnet, but the invention is not limited thereto. In this embodiment, both the connecting block 8 and the bearing 2 include a metal part that can be magnetically attracted by a magnet.

[0049] In this embodiment, the connecting block 8 includes an iron part, a cobalt part or a nickel part, or other metal parts that can be magnetically attracted by a magnet, so that the second magnetic attraction structure 20 can generate a magnetic attraction force on the connecting block 8, thereby making the connecting block 8 approach the second magnetic attraction structure 20. When the second magnetic attraction structure 20 and the connecting block 8 are in the attracted state, the tensioning roller 1 can be in the tensioning position, and the filter belt can be in a tensioned state at this time, but it is not limited to this.

[0050] Continuing to refer to the drawings, the second magnetic structure 20 includes a permanent magnetic suction cup 3 and an adjusting member 5 for adjusting the position of the permanent magnetic suction cup 3, the adjusting member 5 is connected to the frame 7, and one end of the adjusting member 5 facing the first magnetic structure 10 can extend or retract toward the first magnetic structure 10 relative to the frame 7, the permanent magnetic suction cup 3 is connected to one end, and the first magnetic structure 10 can be combined on the permanent magnetic suction cup 3 by magnetic attraction.

[0051] In this embodiment, the second magnetic attraction structure 20 includes a permanent magnetic suction cup 3, and the permanent magnetic suction cup 3 includes a suction cup handle. By turning the suction cup handle, the magnetic system of the neodymium iron boron inside the suction cup is changed, so that the first magnetic attraction structure 10 can be magnetically attracted or released, thereby further improving the versatility of the filter belt tensioning device.

[0052] In this embodiment, the adjusting member 5 is located on the side of the permanent magnetic suction cup 3 facing away from the first magnetic suction structure 10 and is connected to the frame 7. The end of the adjusting member 5 facing the first magnetic suction structure 10 can be extended or retracted relative to the first magnetic suction structure 10. The permanent magnetic suction cup 3 is fixed on the end of the adjusting member 5 facing the first magnetic suction structure 10. When the adjusting member 5 extends or retracts toward the end of the first magnetic suction structure 10, the permanent magnetic suction cup 3 will move with the end of the first magnetic suction structure 10 to adjust the position.

[0053] As an example, the adjusting member 5 includes a screw assembly, which can extend parallel to the first magnetic structure 10 in a direction approaching or moving away from the second magnetic structure 20, and one end of the screw assembly facing the first magnetic structure 10 can extend or retract relative to the frame 7, and the permanent magnetic suction cup 3 is connected to this end.

[0054] Optionally, the adjusting member 5 includes a telescopic cylinder, which can extend in a direction parallel to the first magnetic structure 10 toward or away from the second magnetic structure 20, and one end of the telescopic cylinder facing the first magnetic structure 10 can be extended or retracted relative to the frame 7, and the permanent magnetic suction cup 3 is connected to this end.

[0055] The second magnetic attraction structure 20 provided in the present disclosure includes an adjustment member 5 so as to be able to adjust the position of the permanent magnetic suction cup 3 relative to the frame 7, thereby improving the versatility of the second magnetic attraction structure 20.

[0056] In this embodiment, the filter belt tensioning device may include at least one tensioning roller 1, and the number of tensioning rollers 1 may be set according to the requirements of the belt filter press. In this embodiment, tensioning roller adjustment units are respectively provided at both ends of each tensioning roller 1, but the present invention is not limited thereto.

[0057] Continue to refer to Figure 1 and Figure 2 In this embodiment, the filter belt tensioning device also includes a support roller 6, which is rotatably connected to the frame 7. The support roller 6 is located on the side of the tensioning roller 1 away from the second magnetic attraction structure 20. The support roller 6 is arranged parallel to the tensioning roller 1 and spaced apart from it. The filter belt is wound around the support roller 6 and the tensioning roller 1.

[0058] Another aspect of the present disclosure is to provide a belt filter press, which includes a filter belt, a main frame and a filter belt tensioning device as described above, wherein the filter belt tensioning device is connected to the main frame, the filter belt is wound around a tensioning roller 1, and a frame 7 of the filter belt tensioning device can be connected to the main frame, or arranged on the ground in parallel with the main frame at an interval.

[0059] The belt filter press includes a gravity dehydration section, a pressure dehydration section and a high-pressure dehydration section. After the material enters the belt filter press, it first enters the gravity dehydration section to remove most of the free water through natural sedimentation. Under the action of the sewage pump, the material enters the stirring tank of the gravity dehydration section, where it can be mixed with a polymer coagulant (polymer) to form larger latex-like particles through the bridging effect of the polymer coagulant, and then overflow from the upper end of the stirring tank by gravity flow and fall onto the filter belt.

[0060] The material will be transported by the filter belt to the pressure dehydration section. Under the action of gravity and friction, the material will be further dehydrated and gradually form a filter cake. For example, but not limited to, the pressure dehydration section includes a first filter belt and a second filter belt. The first filter belt is located below the second filter belt, and the distance between the first filter belt and the second filter belt gradually decreases along the conveying direction of the material. In this way, after entering the pressure dehydration section, the material will be subjected to the gradually increasing squeezing pressure of the first filter belt and the second filter belt, thereby further reducing the moisture in the material.

[0061] The material continues to move under the action of the filter belt to enter the high-pressure dehydration section, which includes multiple high-pressure rollers. The high-pressure rollers can press the filter cake under high pressure to further reduce the moisture in the material. After high-pressure dehydration, the moisture in the material is basically removed, forming a relatively dry filter cake.

[0062] As an example, the radius of multiple high-pressure rollers gradually decreases along the conveying direction of the material, and the pressure of multiple high-pressure rollers gradually increases along the conveying direction of the material. As the first filter belt and the second filter belt change their upper and lower positions between different high-pressure rollers, shear force is generated on the sludge to produce a drier filter cake.

[0063] The filter belt tensioning device provided by the present disclosure includes a first magnetic attraction structure 10 and a second magnetic attraction structure 20 that rely on magnetic attraction. Compared with the solution of using a cylinder to tighten the filter belt in the prior art, it saves the operation and maintenance cost of the cylinder, and does not need to configure additional auxiliary accessories such as an air compressor, thereby simplifying the structure of the filter belt tensioning device and further reducing the operation and maintenance cost of the filter belt tensioning device. In addition, this embodiment relies on magnetic attraction and does not need to consume electrical energy or other forms of energy as the energy of the filter belt tensioning device, thereby saving equipment operation energy consumption and further reducing the operation and maintenance cost of the filter belt tensioning device.

[0064] In the description of the present disclosure, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present disclosure.

[0065] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present disclosure, unless otherwise specified, "plurality" means two or more.

[0066] In the description of the present disclosure, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection, it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.

[0067] The features, structures or characteristics described in the present disclosure may be combined in one or more embodiments in any suitable manner. In the above description, many specific details are provided to provide a full understanding of the embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or more of the specific details, or other methods, components, materials, etc. may be adopted. In other cases, known structures, materials or operations are not shown or described in detail to avoid blurring the various aspects of the present disclosure.

Claims

1. A filter belt tensioning device for a belt filter press, characterized in that: The filter belt tensioning device comprises: Frame (7); A tensioning roller (1), used for supporting the filter belt of the belt filter press and rotatably connected to the frame (7); A tensioning roller adjustment unit is capable of driving the tensioning roller (1) to move relative to the frame (7), and the tensioning roller adjustment unit comprises a first magnetic attraction structure (10) and a second magnetic attraction structure (20) which can be attracted by magnetic force, the first magnetic attraction structure (10) being movably connected to the frame (7) along a direction in which the first magnetic attraction structure (10) approaches or moves away from the second magnetic attraction structure (20), the first magnetic attraction structure (10) being connected to the tensioning roller (1) to drive the tensioning roller (1) to move, and the second magnetic attraction structure (20) being connected to the frame (7), and when the second magnetic attraction structure (20) is attracted to the first magnetic attraction structure (10), the tensioning roller (1) is located in a tensioning position, so that the filter belt is tensioned.

2. The filter belt tensioning device for a belt filter press according to claim 1, characterized in that: At least one of the first magnetic attraction structure (10) and the second magnetic attraction structure (20) comprises a magnet.

3. The filter belt tensioning device for a belt filter press according to claim 1, characterized in that: The first magnetic attraction structure (10) comprises a bearing (2), the bearing (2) is connected to the frame (7), and the end of the tensioning roller (1) is rotatably connected to the bearing (2).

4. The filter belt tensioning device for a belt filter press according to claim 3, characterized in that: The first magnetic structure (10) further comprises a guide member (4), wherein the guide member (4) is movably connected to the frame (7) along a direction in which the first magnetic structure (10) approaches or moves away from the second magnetic structure (20), and the bearing (2) is connected to an end of the guide member (4) facing the second magnetic structure (20).

5. The filter belt tensioning device for a belt filter press according to claim 4, characterized in that: The guide member (4) comprises a guide rod extending in a direction from the first magnetic structure (10) to the second magnetic structure (20) or away from the first magnetic structure (10), the first magnetic structure (10) further comprising a connecting block (8), the connecting block (8) being fixed to the end of the guide rod facing the second magnetic structure (20), and the connecting block (8) being located between the bearing (2) and the second magnetic structure (20), the connecting block (8) having a fitting surface capable of fitting with the second magnetic structure (20), and when the fitting surface fits with the second magnetic structure (20), the tensioning roller (1) is located in a tensioning position.

6. The filter belt tensioning device for a belt filter press according to claim 5, characterized in that: The second magnetic attraction structure (20) comprises a permanent magnetic suction cup (3), and one of the bearing (2) and the connecting block (8) comprises a metal part capable of combining with the magnetic attraction force of the permanent magnetic suction cup (3).

7. The filter belt tensioning device for a belt filter press according to claim 1, characterized in that: The second magnetic attraction structure (20) comprises a permanent magnetic suction cup (3) and an adjusting member (5) for adjusting the position of the permanent magnetic suction cup (3), wherein the adjusting member (5) is connected to the frame (7), and one end of the adjusting member (5) facing the first magnetic attraction structure (10) can extend or retract toward the first magnetic attraction structure (10) relative to the frame (7), and the permanent magnetic suction cup (3) is connected to the one end.

8. The filter belt tensioning device for a belt filter press according to claim 7, characterized in that: The adjusting member (5) comprises a screw assembly, the screw assembly can extend in a direction parallel to the first magnetic structure (10) towards or away from the second magnetic structure (20), and one end of the screw assembly facing the first magnetic structure (10) can extend or retract relative to the frame (7); or, The adjusting member (5) comprises a telescopic cylinder, which can extend in a direction parallel to the first magnetic structure (10) toward or away from the second magnetic structure (20), and one end of the telescopic cylinder facing the first magnetic structure (10) can extend or retract relative to the frame (7).

9. The filter belt tensioning device for a belt filter press according to any one of claims 1 to 7, characterized in that: The filter belt tensioning device also includes a support roller (6), which is rotatably connected to the frame (7), and the support roller (6) is located on the side of the tensioning roller (1) away from the second magnetic attraction structure (20). The support roller (6) and the tensioning roller (1) are arranged in parallel and at intervals, and the filter belt is wound around the support roller (6) and the tensioning roller (1).

10. A belt filter press, characterized in that: The belt filter press comprises a filter belt, a main frame and a filter belt tensioning device as claimed in any one of claims 1 to 9, wherein the filter belt tensioning device is connected to the main frame, and the filter belt is wound around the tensioning roller (1).

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