A paper pulp rough filter device of a folding screen

Abstract

The utility model discloses a paper pulp rough filter device of folding filter screen relates to paper pulp rough filter device technical field, and it aims at solving the problem of small filter area of current plane static filter screen, easy to block, cleaning is difficult and the problem of complicated dismounting, and its technical scheme main points are including having the rough filter device body, the inner side wall of rough filter device body all is fixedly connected with support frame, the top of support frame is equipped with the outer frame, the inside of outer frame is equipped with the folding filter screen, four end feet of support frame upper end surface are equipped with the transmission lifting mechanism for the lifting of folding filter screen, and the left and right sides between folding filter screen and outer frame all can detachably be connected with dismounting subassembly, the left and right sides of rough filter device body one end surface all are equipped with through -hole, and one end of rough filter device body passes through the electric push rod through two through -holes, and the front end of two electric push rods is fixedly connected with the push board.

Description

Technical Field

[0001] This utility model relates to the technical field of pulp coarse filtration devices, and in particular to a pulp coarse filtration device with a folded filter screen. Background Technology

[0002] In pulp production, coarse filtration is a crucial step in removing large particulate impurities (such as bark, sand, and fiber bundles). Located at the beginning of the pulping process, it serves as the first line of defense to ensure the stable and efficient operation of subsequent processes (such as fine filtration, bleaching, beating, and papermaking). The effectiveness of coarse filtration directly impacts the continuity of the entire production line, equipment lifespan, and the quality of the final paper product.

[0003] However, most of the pleated filter screens in existing pulp coarse filtration devices are designed as flat screens. Flat screens result in imperfect filtration, and the static filter screen structure, which is fixed inside the coarse filtration device, affects the overall filtration effect. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a pulp coarse filtration device with a folded filter screen, which has the advantages of large filtration area, easy clogging, convenient online cleaning, and quick disassembly and maintenance. It solves the problems of small filtration area, easy clogging, difficult cleaning, and cumbersome disassembly and assembly of existing planar static filter screens.

[0005] The technical solution of this utility model is as follows: a pulp coarse filtration device with a folded filter screen, comprising a coarse filtration device body, a support frame fixedly connected to the inner side wall of the coarse filtration device body, an outer frame provided above the support frame, a folded filter screen provided inside the outer frame, a transmission lifting mechanism for raising and lowering the folded filter screen provided at the four end feet of the upper end face of the support frame, and disassembly and assembly components detachably connected to the left and right sides of the folded filter screen and the outer frame, through holes provided on the left and right sides of one end surface of the coarse filtration device body, and an electric push rod passing through two through holes at one end of the coarse filtration device body, with a push plate fixedly connected to the front end face of the two electric push rods.

[0006] By adopting the above technical solution, an integrated coarse filtration system is achieved, which combines filtration, automatic slag discharge, adjustable height for maintenance, and quick assembly / disassembly. The serrated pleated filter screen is installed inside the outer frame and is raised and lowered as a whole via a transmission lifting mechanism, facilitating adjustment of the working position or maintenance. Simultaneously, the filter screen is detachably connected to the outer frame via disassembly components on both sides, making filter screen replacement convenient. An electric push rod drives a push plate to automatically push large particles of impurities filtered out towards the waste outlet, thus automating the coarse filtration process.

[0007] Furthermore, the transmission lifting mechanism includes lead screws, which are vertically located at the four ends of the support frame and fixedly connected thereto. The top ends of the four lead screws are all fixedly connected to second rotating shafts, and two worm gears are sleeved on the outside of the two opposite second rotating shafts. A worm is meshed with one side of each of the two worm gears.

[0008] By adopting the above technical solution, the rotational motion is converted into linear lifting motion by utilizing the cooperation between the lead screw and the threaded groove on the outer frame; the drive force is provided to the lead screw through the meshing transmission of the worm gear and worm. The worm gear structure has a self-locking characteristic, which can ensure that the outer frame can be stably stopped after being lifted into position, and will not slide down due to its own weight or slurry pressure, thereby improving the safety and reliability of operation.

[0009] Furthermore, one end of each of the two worm gears is rotatably connected to a second arc-shaped plate fixed to the inner wall of the coarse filter device body via a bearing, and the other end is fixedly connected to a first rotating shaft. The two first rotating shafts are rotatably connected to the first arc-shaped plate fixed to the outer wall of the coarse filter device body via a bearing, and the outer end of one of the first rotating shafts is connected to the output shaft of a motor.

[0010] By adopting the above technical solution, the first arc plate and the second arc plate provide stable installation and support for the worm gear and the first rotating shaft, ensuring the smoothness of the transmission process; the motor, as the power source, drives the worm gear to rotate through the first rotating shaft, realizing the automated control of the entire lifting mechanism, which is convenient to operate and responds quickly.

[0011] Furthermore, each of the two first rotating shafts is fitted with a second pulley, and the two second pulleys are connected by a first belt drive. Each of the four second rotating shafts is fitted with a third pulley, and the two third pulleys located on the same side are connected by a second belt drive. Each of the four ends of the outer frame is provided with a threaded groove, and the four lead screws are respectively threaded through the corresponding threaded grooves.

[0012] By adopting the above technical solution, the cooperation of the first belt and the second pulley ensures the synchronous rotation of the worm gears on both sides; the cooperation of the second belt and the third pulley ensures the synchronous rotation of the two lead screws on the same side. This dual-side synchronous transmission design ensures that the lifting height of the four corners of the outer frame is completely consistent, avoiding filter screen tilting, jamming or structural damage caused by asynchronous lifting, and greatly improving the stability and reliability of the lifting process.

[0013] Furthermore, the disassembly and assembly assembly includes L-shaped mounting blocks fixedly connected to the left and right sides of the folded filter screen. Fixing grooves are provided on both the left and right sides of the surface of the L-shaped mounting blocks. Springs are fixedly connected to the inner walls of the fixing grooves. Four springs are distributed in a circular array, and a clamp is fixedly connected to one end of each of the four springs.

[0014] By adopting the above technical solution, the spring force drives the clamping plate to apply clamping force to the L-shaped mounting block, thereby firmly fixing the folded filter screen to the outer frame. This structure is simple and reliable, with uniform clamping force, and can effectively prevent the filter screen from loosening or falling off during operation.

[0015] Furthermore, inner grooves are provided on both the left and right sides of the outer frame. The L-shaped mounting block is installed with the outer frame by a threaded fixing rod. The surface of the threaded fixing rod is provided with a snap-fit ​​groove that engages with the clamping plate. The threaded fixing rod and the L-shaped mounting block pass through the fixing groove and engage with each other to insert into the inner groove for the installation of the folded filter screen.

[0016] By adopting the above technical solution, after the threaded fixing rod is screwed into the inner groove, the snap-fit ​​groove on its surface will lock the clamping plate, thereby compressing the spring and keeping the clamping plate in a clamping state on the L-shaped mounting block, thus achieving a firm installation of the filter screen. When disassembly is required, simply unscrew the threaded fixing rod, and the spring force will be released immediately, pushing the clamping plate back and loosening the clamping on the L-shaped mounting block, so that the folded filter screen can be easily removed. This achieves quick and convenient replacement of the filter screen, significantly reducing maintenance time and labor intensity.

[0017] Furthermore, the coarse filter body has a waste outlet on the other end surface away from the through hole, and a guide plate is fixedly connected to the inner wall of the waste outlet. The folded filter screen has a sawtooth structure.

[0018] By adopting the above technical solution, the zigzag pleated filter screen provides a huge effective filtration area in a limited space, improving filtration efficiency and impurity holding capacity; the waste outlet is used to discharge the impurities cleaned by the push plate, and the guide plate on its inner wall helps the impurities slide out smoothly, preventing blockage of the outlet and ensuring the continuity and reliability of the automatic slag discharge function.

[0019] The beneficial effects of this utility model are:

[0020] 1. A pulp coarse filtration device with a folded filter screen. This device adopts a serrated folded filter screen, which provides a filtration area far exceeding that of traditional flat filter screens in the same installation space. This not only significantly increases the pulp processing capacity per unit time, but also reduces the filtration load per unit area, making the impurities more evenly distributed, effectively preventing localized clogging, thereby extending the continuous operating time and improving the overall production efficiency.

[0021] 2. This folded filter screen pulp coarse filtration device, through the linkage structure of electric push rod and push plate, can automatically push large particles of impurities such as bark and sand trapped on the surface of the filter screen to the waste outlet without stopping the machine. This design completely changes the traditional manual cleaning mode, realizes the automation and continuity of the coarse filtration process, reduces unplanned downtime, and ensures the stable operation of the production line.

[0022] 3. The introduction of a transmission lifting mechanism in this folded filter screen pulp coarse filtration device makes the height of the outer frame and folded filter screen adjustable. During maintenance, the filter screen can be raised to a position that is easy to operate, expanding the maintenance space and improving the safety and convenience of operation. At the same time, the mechanism ensures the stability of the filter screen during operation and avoids loosening of the connection due to vibration.

[0023] 4. This is a pulp coarse filtration device with a folded filter screen. The device innovatively designs a detachable assembly and disassembly component. Through the cooperation of L-shaped mounting blocks, threaded fixing rods, clamps and springs, operators can complete the disassembly and replacement of the folded filter screen in a short time without the use of complicated tools. This structure greatly shortens maintenance time and reduces labor intensity, and is especially suitable for working conditions that require frequent cleaning or replacement of the filter screen. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of the pulp coarse filtration device of this utility model;

[0025] Figure 2 This utility model Figure 1 A magnified schematic diagram of the three-dimensional structure at point A;

[0026] Figure 3 This utility model Figure 1 A magnified schematic diagram of the three-dimensional structure at point B;

[0027] Figure 4 This is a partially enlarged structural diagram of the folded filter screen of this utility model;

[0028] Figure 5 This is a schematic diagram of the cross-sectional installation structure of the filter screen of this utility model.

[0029] In the diagram: 1. Main body of the coarse filter device; 2. Transmission lifting mechanism; 21. Threaded groove; 22. First arc-shaped plate; 23. First belt; 24. Second pulley; 25. Worm gear; 26. Second arc-shaped plate; 27. First rotating shaft; 28. Motor; 29. ​​Second belt; 210. Third pulley; 211. Second rotating shaft; 212. Worm gear; 213. Lead screw; 3. Through hole; 4. Electric push rod; 5. Outer frame; 6. Push plate; 7. Folded filter screen; 8. Waste outlet; 9. Disassembly and assembly assembly; 91. L-shaped mounting block; 92. Threaded fixing rod; 93. Fixing groove; 94. Inner groove; 95. Snap-fit ​​groove; 96. Clamping plate; 97. Spring. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Please see Figures 1-5 This embodiment of a folded filter screen pulp coarse filtration device includes a coarse filtration device body 1. Support frames are fixedly connected to the inner walls of the coarse filtration device body 1. An outer frame 5 is provided above the support frame, and a folded filter screen 7 is provided inside the outer frame 5. Four end feet on the upper surface of the support frame are provided with a transmission lifting mechanism 2 for raising and lowering the folded filter screen 7. Disassembly and assembly components 9 are detachably connected to both the left and right sides of the folded filter screen 7 and the outer frame 5. Through holes 3 are provided on both the left and right sides of one end surface of the coarse filtration device body 1. An electric push rod 4 passes through two through holes 3 at one end of the coarse filtration device body 1. Push plates 6 are fixedly connected to the front ends of the two electric push rods 4 (when not in use, the push plates 6 retract to the gap between the outer frame 5 and the coarse filtration device body 1 through the telescopic movement of the electric push rods 4, without affecting the raising and lowering). A waste outlet 8 is provided on the other end surface of the coarse filtration device body 1 away from the through holes 3. A guide plate is fixedly connected to the inner wall of the waste outlet 8. The folded filter screen 7 has a sawtooth structure.

[0032] In this embodiment, the design of the serrated pleated filter screen 7 significantly increases the filtration area, improves the impurity interception efficiency and the processing capacity of the device; the electric push rod 4 drives the push plate 6 to automatically push the impurities accumulated on the filter screen surface to the waste outlet 8, realizing the automated slag discharge of the coarse filtration process and avoiding the tediousness and untimely nature of manual cleaning; the guide plate at the waste outlet 8 ensures that impurities are discharged smoothly and prevents outlet blockage; the entire device has a compact structure and high functional integration, effectively solving the technical problems of low filtration efficiency, easy clogging and inconvenient maintenance of traditional coarse filtration devices.

[0033] Please see Figures 2-3In this embodiment, the transmission lifting mechanism 2 includes lead screws 213, which are vertically located at the four ends of the support frame and fixedly connected thereto. Each of the four lead screws 213 has a second rotating shaft 211 fixedly connected to its top. Two worm gears 212 are fitted onto the outside of each of the two opposing second rotating shafts 211. A worm 25 is meshed with one side of each of the two worm gears 212. One end of each worm 25 is rotatably connected to a second arc-shaped plate 26 fixed to the inner wall of the coarse filter device body 1 via a bearing, and the other end is fixedly connected to a first rotating shaft 27. The two first rotating shafts 27 are rotated via bearings. The first arc plate 22 is movably connected to the outer wall of the coarse filter body 1. The outer end of one of the first rotating shafts 27 is connected to the output shaft of the motor 28. The outer sides of the two first rotating shafts 27 are each fitted with a second pulley 24. The two second pulleys 24 are connected by a first belt 23. The outer sides of the four second rotating shafts 211 are each fitted with a third pulley 210. The two third pulleys 210 located on the same side are connected by a second belt 29. The four ends of the outer frame 5 are each provided with a threaded groove 21. The four lead screws 213 are threaded through the corresponding threaded grooves 21.

[0034] It should be noted that after the motor 28 starts, it drives the worm 25 to rotate through the first rotating shaft 27. The worm 25 drives the worm wheel 212 to rotate, thereby driving the second rotating shaft 211 and the lead screw 213 to rotate synchronously. Since the lead screw 213 is threadedly engaged with the threaded groove 21 on the outer frame 5, the rotation of the lead screw 213 will be converted into the vertical lifting and lowering motion of the outer frame 5 and the folded filter screen 7. The first belt 23 ensures the synchronization of the worms 25 on both sides, and the second belt 29 ensures the synchronization of the two lead screws 213 on the same side, thereby ensuring that the outer frame 5 rises and falls smoothly and horizontally, avoiding tilting and jamming. The self-locking characteristic of the worm wheel 212 and worm 25 structure can also reliably lock the filter screen position when the power is off or when the machine stops, ensuring safe operation.

[0035] Please see Figure 1 and Figure 5 In this embodiment, the disassembly and assembly component 9 includes L-shaped mounting blocks 91 fixedly connected to the left and right sides of the folded filter screen 7. Fixing grooves 93 are provided on both the left and right sides of the surface of the L-shaped mounting blocks 91. Springs 97 are fixedly connected to the inner wall of the fixing grooves 93. Four springs 97 are arranged in a circular array. One end of the four springs 97 is fixedly connected to a clamping plate 96. Inner grooves 94 are provided on both the left and right sides of the outer frame 5. The L-shaped mounting blocks 91 are installed with the outer frame 5 through threaded fixing rods 92. The surface of the threaded fixing rods 92 is provided with snap-fit ​​grooves 95 that engage with the clamping plates 96. The threaded fixing rods 92 and L-shaped mounting blocks 91 pass through the fixing grooves 93 and engage with each other to insert into the inner grooves 94 for the installation of the folded filter screen 7.

[0036] It should be noted that when installing the folded filter screen 7, align the L-shaped mounting block 91 with the inner groove 94 of the outer frame 5, insert the threaded fixing rod 92 and screw it into the inner groove 94. As the threaded fixing rod 92 is screwed in, the snap-fit ​​groove 95 on its surface will lock the clamping plate 96, compressing the spring 97, so that the clamping plate 96 tightly clamps the L-shaped mounting block 91, thereby firmly fixing the filter screen. When disassembling, unscrew the threaded fixing rod 92 in the opposite direction. The elastic force of the spring 97 will be released immediately, pushing the clamping plate 96 to spring back, releasing the clamping of the L-shaped mounting block 91, and the folded filter screen 7 can be easily removed from the outer frame 5. This structure enables quick and convenient replacement of the filter screen, greatly facilitating equipment maintenance and filter cleaning or replacement.

[0037] The working principle of the above embodiments is as follows:

[0038] In use, the pulp to be processed flows in from the inlet of the coarse filter body 1, first contacting the pleated filter screen 7 located inside the device. This filter screen adopts a sawtooth pleated structure, which greatly increases the effective filtration area. When the electric push rod 4 is powered on, its telescopic rod moves forward, driving the push plate 6 to move horizontally within the coarse filter body 1. The push plate 6 pushes the impurities accumulated on the surface of the pleated filter screen 7 towards the waste outlet 8. The motor 28 is started, and its output shaft drives the first rotating shaft 27 to rotate. The first rotating shaft 27 transmits power to the other rotating shaft 27 through the second pulley 24 and the first belt 23 to ensure synchronization on both sides. The first rotating shaft 27 drives the worm gear 25 to rotate. The worm gear 25 meshes with the worm wheel 212, transmitting the rotational motion to the second rotating shaft 211. The second rotating shaft 211 drives the four corners through the third pulley 210 and the second belt 29. The second rotating shaft 211 of the part rotates synchronously, and the second rotating shaft 211 drives the lead screw 213 to rotate. The lead screw 213 and the threaded groove 21 on the outer frame 5 form a threaded pair, thereby driving the entire outer frame 5 and the folded filter screen 7 installed inside it to rise or fall smoothly. The lifting design facilitates obtaining more operating space during maintenance or adjusting the filtration angle under special working conditions. First, the outer frame 5 is raised to a height that is easy to operate through the transmission lifting mechanism 2. Then, the threaded fixing rod 92 is unscrewed from the inner groove 94 of the outer frame 5. After the threaded fixing rod 92 is disengaged, the snap-fit ​​groove 95 on its surface no longer restricts the clamping plate 96. Under the elastic force of the spring 97, the clamping plate 96 retracts inward, releasing the clamping of the L-shaped mounting block 91. At this time, the folded filter screen 7 can be easily removed from the outer frame 5, completing the disassembly. When installing a new filter screen, the reverse steps are followed.

[0039] It should be noted that the power source of the transmission lifting mechanism 2 in this invention is a motor 28. Its control method can achieve start / stop and forward / reverse operation through conventional switches or control circuits familiar to those skilled in the art. The power supply connection and supply method are also common knowledge in this field. The core of this invention lies in the innovative design of the mechanical structure, particularly the lifting transmission, automatic slag discharge, and quick assembly / disassembly structure of the folded filter screen 7, rather than the control circuit of the motor 28 itself. Therefore, the specific control logic, electrical connection method, and power module of the motor 28, which are not core components, will not be described in detail in this invention.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pulp coarse filtration device with a folded filter screen, comprising a coarse filtration device body (1), wherein the inner sidewalls of the coarse filtration device body (1) are fixedly connected to support frames, characterized in that: The support frame is provided with an outer frame (5) on top, and a folded filter screen (7) is provided inside the outer frame (5). The four ends of the upper surface of the support frame are provided with a transmission lifting mechanism (2) for raising and lowering the folded filter screen (7). The left and right sides of the folded filter screen (7) and the outer frame (5) are detachably connected with disassembly and assembly components (9). The left and right sides of one end surface of the coarse filter device body (1) are provided with through holes (3). One end of the coarse filter device body (1) passes through two through holes (3) and an electric push rod (4) passes through it. The front end faces of the two electric push rods (4) are fixedly connected with push plates (6).

2. The pulp coarse filtration device with a pleated filter screen according to claim 1, characterized in that: The transmission lifting mechanism (2) includes lead screws 213 (213), which are vertically located at the four ends of the support frame and fixedly connected thereto. The top ends of the four lead screws 213 (213) are all fixedly connected to second rotating shafts (211). Two worm gears (212) are sleeved on the outside of the two opposite second rotating shafts (211), and worm gears (25) are meshed on one side of the two worm gears (212).

3. The pulp coarse filtration device with a folded filter screen according to claim 2, characterized in that: One end of each of the two worm gears (25) is rotatably connected to a second arc plate (26) fixed to the inner wall of the coarse filter body (1) via a bearing, and the other end is fixedly connected to a first rotating shaft (27). The two first rotating shafts (27) are rotatably connected to a first arc plate (22) fixed to the outer wall of the coarse filter body (1) via a bearing, and the outer end of one of the first rotating shafts (27) is connected to the output shaft of a motor (28).

4. The pulp coarse filtration device with a pleated filter screen according to claim 3, characterized in that: Two first rotating shafts (27) are fitted with second pulleys (24) on their exteriors. The two second pulleys (24) are connected by a first belt (23). The four second rotating shafts (211) are fitted with third pulleys (210) on their exteriors. The two third pulleys (210) on the same side are connected by a second belt (29). The four ends of the outer frame (5) are provided with threaded grooves (21). The four lead screws 213 (213) are threaded together by the corresponding threaded grooves (21).

5. The pulp coarse filtration device with a pleated filter screen according to claim 1, characterized in that: The disassembly and assembly assembly (9) includes L-shaped mounting blocks (91) fixedly connected to the left and right sides of the folded filter screen (7). Fixing grooves (93) are provided on the left and right sides of the surface of the L-shaped mounting blocks (91). Springs (97) are fixedly connected to the inner wall of the fixing grooves (93). Four springs (97) are arranged in a ring array. One end of the four springs (97) is fixedly connected to a clamp (96).

6. The pulp coarse filtration device with a pleated filter screen according to claim 5, characterized in that: The outer frame (5) has inner grooves (94) on both sides. The L-shaped mounting block (91) is installed with the outer frame (5) by a threaded fixing rod (92). The surface of the threaded fixing rod (92) has a snap-fit ​​groove (95) that engages with the clamping plate (96). The threaded fixing rod (92) and the L-shaped mounting block (91) pass through the fixing groove (93) and engage with each other to insert into the inner groove (94) for the installation of the folded filter screen (7).

7. A pulp coarse filtration device with a pleated filter screen according to claim 1, characterized in that: The coarse filter body (1) has a waste outlet (8) on the other end surface away from the through hole (3). The inner wall of the waste outlet (8) is fixedly connected to a guide plate, and the folded filter screen (7) has a sawtooth structure.

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