A pretreatment device for paper product production

Abstract

The application relates to the paper product production and processing technical field and discloses a pretreatment device for paper product production, which comprises a first treatment frame, a second treatment frame, a third treatment frame and a feeding hopper arranged from bottom to top, two crushing rollers are rotationally arranged in the third treatment frame and are engaged with each other, a sieving assembly is arranged in the second treatment frame, the sieving assembly comprises mounting columns arranged in the second treatment frame, movable frames are slidably arranged outside the mounting columns, screens are arranged on the movable frames, the screens are arranged in an inclined mode in the second treatment frame, the reciprocating vibration of the screens and the reciprocating shaking of movable plates are combined to realize the rapid screening of crushed materials and the continuous return treatment of materials that do not meet the standards, the vibration of the screens improves the screening efficiency, the shaking of the movable plates avoids the accumulation of materials in the material conveying frame, the combination of the two guarantees the smoothness of the crushing-screening-return process, reduces the demand for manual intervention and improves the overall processing efficiency.

Description

Technical Field

[0001] This invention relates to the field of paper product manufacturing and processing technology, specifically to a pretreatment device for paper product manufacturing. Background Technology

[0002] In the paper product manufacturing process, raw material pretreatment is a key step to ensure uniform paper quality and stable production processes. Pretreatment of raw materials through steps such as crushing, screening, and mixing can effectively remove impurities, adjust particle size distribution, and improve the efficiency and quality of subsequent pulping and papermaking processes. Especially in the production of high-strength paperboard and specialty paper products, the pretreatment effect directly affects product performance indicators and production cost control. Therefore, the research and development of pretreatment equipment for paper product manufacturing has significant industrial value.

[0003] Existing pretreatment equipment for paper product manufacturing generally suffers from the major problem of "multiple breakpoints in the processing flow leading to low resource utilization." Specifically, traditional equipment often employs an open-loop processing structure, where large particles that do not meet particle size requirements after crushing are often directly discharged or simply piled up, lacking an effective recycling mechanism. This results in uneven mixing of qualified raw materials and untreated materials, requiring repeated crushing operations, which not only reduces overall processing efficiency but also wastes raw materials. Simultaneously, dust generated during screening and crushing is mostly treated through open-loop emissions, polluting the production environment and causing the loss of recyclable fine particles, increasing environmental treatment costs and raw material losses. These problems collectively reflect the inadequacies of existing technologies in the "continuous processing-resource recovery" dimension. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a pretreatment apparatus for paper product manufacturing to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a pretreatment device for paper product production, comprising a first treatment frame, a second treatment frame, a third treatment frame and a feed hopper arranged from bottom to top, wherein the first treatment frame is provided with an injection hole for adding a reagent and a discharge pipe for discharging raw materials, and the third treatment frame is rotatably equipped with two interlocking crushing rollers. The second processing frame is provided with a sieving component, which includes a mounting column disposed in the second processing frame, a movable frame slidably disposed outside the mounting column, and a screen disposed on the movable frame. The screen is inclined in the second processing frame. A return hopper is provided on the side of the second processing frame, and a conveying frame is provided on the side of the return hopper. The conveying frame is inclined and is provided with a reverse conveying component for conveying unqualified raw materials to the feed hopper. The reverse conveying component includes a support frame and a conveyor belt is provided above the support frame. The surface of the conveyor belt is provided with anti-slip texture to improve transportation stability. Preferably, a drive motor is provided on the side of the first processing frame, and a third pulley is provided on the output shaft of the drive motor and the end of one of the crushing rollers. A third synchronous belt is connected to the two third pulleys. Preferably, the screening assembly includes a first connecting rod rotatably disposed in the second processing frame, and a second pulley is provided on the outside of the first connecting rod and at one end of the crushing roller. The two second pulleys are externally connected to a second synchronous belt to realize the power transmission of crushing and screening. A connecting spring is fitted around the outside of the mounting column, and one end of the connecting spring is fixedly connected to the outside of the movable frame. The first connecting rod is provided with a first cam on its exterior; When the first connecting rod rotates, the first cam contacts the bottom of the screen; When the first cam loses contact with the bottom of the screen, the connecting spring returns to its original length, so that the screen returns to its initial position; Preferably, a movable plate is slidably arranged in the feeding frame, a first connecting frame is provided at the bottom of the feeding frame, a connecting column is provided on the first connecting frame, a first spring is sleeved on the outside of the connecting column, and the two ends of the first spring are fixedly connected to the bottom of the first connecting frame and the movable plate, respectively. Preferably, the reverse conveying assembly includes a drive device mounted on a support frame for driving the conveyor belt, wherein the output end of the drive device is connected to a second connecting rod, and a second cam is provided on the outside of the second connecting rod; When the second connecting rod rotates, the second cam abuts against the bottom of the movable plate; Preferably, a dust treatment component is provided on the side of the feed hopper. The dust treatment component includes a fan. A second connecting frame is provided on the side of the first treatment frame. A dust suction pipe is provided in the second connecting frame. The dust suction pipe is connected to the dust suction end of the fan. A through hole is provided on the feed hopper for the dust suction pipe to pass through. The exhaust end of the fan is equipped with a connecting pipe, which passes through the second processing frame and faces the inside of the first processing frame, so as to discharge the adsorbed small particles into the first processing frame. Preferably, the feed hopper includes a branch pipe connected to the outside of the connecting pipe, a filter screen is provided in the branch pipe, and an aeration pipe is provided on the side of the branch pipe away from the connecting pipe. The aeration pipe is located at the bottom of the inside of the first processing frame so as to introduce gas into the first processing frame to aerate the mixture in the first processing frame and improve the uniformity of the agent mixing. Preferably, the first processing frame is provided with a mixing component, the mixing component including a first stirring rod and two second stirring rods rotatably disposed in the first processing frame; Two second stirring rods are located on either side of the first stirring rod; When the second stirring rod and the first stirring rod rotate, the mixture in the first processing frame can be stirred to improve the drug processing efficiency. Preferably, the mixing component includes a connecting frame disposed outside the first processing frame, a first bevel gear rotatably disposed in the connecting frame, a sleeve rotatably disposed on the first processing frame, and the first stirring rod being fixedly connected to the end of the sleeve; The connecting frame is provided with an installation rod, and the end of the installation rod is fixed with a connecting plate. Two second stirring rods are symmetrically arranged on the connecting plate and are movably connected to the second stirring rods. Preferably, the mixing component includes a second bevel gear disposed outside the sleeve, the second bevel gear meshing with the first bevel gear; The mounting rod is provided with a third bevel gear, which meshes with the first bevel gear. When the third bevel gear rotates, the second bevel gear is also rotating under the action of the first bevel gear, and the rotation direction of the second bevel gear is opposite to that of the third bevel gear, thus forming a bidirectional stirring effect. Both the outer side of the mounting rod and the outer side of the first connecting rod are provided with first pulleys, and the two first pulleys are externally connected to a first synchronous belt to achieve coordinated driving of sieving and stirring.

[0006] In summary, the present invention has the following main beneficial effects: 1. This invention achieves rapid screening of crushed materials and continuous recycling of substandard materials through a dual mechanism of reciprocating vibration of the screen and reciprocating shaking of the movable plate. Screen vibration improves screening efficiency, while the shaking of the movable plate avoids material accumulation in the conveying frame. The two work together to ensure the smoothness of the crushing-screening-recycling process, reduce the need for manual intervention, and improve overall processing efficiency. 2. The dust treatment component in this invention directly transports the sucked dust and small particles to the inside of the first treatment frame through the connecting pipe, realizing the recycling of dust and fine particles and avoiding resource waste; at the same time, the branch pipe only transports filtered gas to the aeration pipe for bottom aeration, promoting the mixing of the agent and the material, forming a dual resource recycling system of "dust recycling-gas reuse" to improve resource utilization efficiency. 3. In this invention, the mixing component drives the second and third bevel gears to rotate in opposite directions via the first bevel gear, thereby causing the first stirring rod and the second stirring rods on both sides to form a bidirectional stirring effect. Combined with the bottom aeration effect of the aeration pipe, the mixing uniformity of the agent and the material is enhanced from both mechanical stirring and gas disturbance dimensions, improving the stability of the pretreatment effect and ensuring the quality of subsequent production. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the overall three-dimensional structure of the present invention. Figure 3 ; Figure 4 This is a partial disassembly diagram of the present invention. Figure 1 ; Figure 5 This is a partial disassembly diagram of the present invention. Figure 2 ; Figure 6 This is a partial disassembly diagram of the present invention. Figure 3 ; Figure 7 This is a schematic diagram of the disassembled structure of the hybrid component in this invention; Figure 8 This is a partial disassembly diagram of the hybrid component in this invention; Figure 9 This is a partial disassembly diagram of the present invention. Figure 4 ; Figure 10 This is a schematic diagram of the disassembled structure of the dust treatment mechanism in this invention.

[0008] In the diagram: 1. First processing frame; 11. Discharge pipe; 12. Mixing component; 121. Connecting frame; 1211. First bevel gear; 122. Sleeve; 1221. Second bevel gear; 123. Mounting rod; 1231. First stirring rod; 1232. Third bevel gear; 124. Connecting plate; 125. Second stirring rod; 126. First pulley; 127. First synchronous belt; 2. Second processing frame; 21. Screening component; 211. Mounting column; 212. Movable frame; 213. Screen; 2131. Connecting spring; 214. First connecting rod; 215. Second pulley; 216. Second synchronous belt; 217. First convex... 22. Wheel; 22. Return hopper; 221. Conveying frame; 222. Movable plate; 223. First connecting frame; 224. Connecting column; 225. First spring; 23. Reverse conveying assembly; 231. Support frame; 232. Conveyor belt; 2321. Drive device; 233. Second connecting rod; 234. Second cam; 3. Third processing frame; 31. Drive motor; 311. Third pulley; 312. Third synchronous belt; 32. Crushing roller; 4. Feed hopper; 41. Dust treatment assembly; 411. Exhaust fan; 412. Second connecting frame; 4121. Dust suction pipe; 413. Connecting pipe; 414. Branch pipe; 415. Aeration pipe. Detailed Implementation

[0009] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0010] The embodiments of the present invention will now be described. Example 1

[0011] Please see Figures 1-10 This invention provides a technical solution: a pretreatment device for paper product production, comprising a first treatment frame 1, a second treatment frame 2, a third treatment frame 3, and a feed hopper 4 arranged from bottom to top. The first treatment frame 1 has an injection hole for adding chemicals and a discharge pipe 11 for discharging raw materials. The third treatment frame 3 has two interlocking crushing rollers 32 rotatably arranged in it. The initial crushing of the raw materials is achieved by the opposite rotation of the crushing rollers 32, providing a base material with uniform particle size for subsequent screening and ensuring the continuity of the pretreatment process. The second processing frame 2 is provided with a screening component 21. The screening component 21 includes a mounting column 211 disposed in the second processing frame 2. A movable frame 212 is slidably disposed on the outside of the mounting column 211. A screen 213 is disposed on the movable frame 212. The screen 213 is disposed at an inclination in the second processing frame 2. The inclination screen 213 uses gravity to assist the material to slide down, and together with the sliding structure of the movable frame 212, it can improve screening efficiency and reduce material retention. A return hopper 22 is provided on the side of the second processing frame 2, and a conveying frame 221 is provided on the side of the return hopper 22. The conveying frame 221 is inclined, and a reverse conveying component 23 for conveying unqualified raw materials to the feed hopper 4 is provided on the conveying frame 221. The reverse conveying component 23 includes a support frame 231, and a conveyor belt 232 is provided above the support frame 231. The surface of the conveyor belt 232 is provided with anti-slip texture to improve the transport stability. The anti-slip texture of the conveyor belt 232 ensures that large particles do not slip during reverse conveying, ensuring the reliability of the return process. Furthermore, a drive motor 31 is provided on the side of the first processing frame 1. The output shaft of the drive motor 31 and the end of one of the crushing rollers 32 are both fixed with a third pulley 311. A third synchronous belt 312 is connected to the two third pulleys 311 for transmission. The third synchronous belt 312 realizes efficient power transmission between the drive motor 31 and the crushing roller 32, reduces energy loss, and improves the stability of the crushing operation. Furthermore, the screening assembly 21 includes a first connecting rod 214 rotatably disposed in the second processing frame 2. A second pulley 215 is provided on the outside of the first connecting rod 214 and at one end of the crushing roller 32. A second synchronous belt 216 is externally connected to the two second pulleys 215 to transmit power between crushing and screening. The second synchronous belt 216 links the crushing roller 32 and the first connecting rod 214, synchronizing the screening action with the crushing operation and improving overall processing efficiency. A connecting spring 2131 is sleeved on the outside of the mounting column 211. One end of the connecting spring 2131 is fixedly connected to the outside of the movable frame 212. The connecting spring 2131 provides elastic restoring force, which, together with the periodic lifting of the first cam 217, realizes the reciprocating vibration of the screen 213 and enhances the screening effect. A first cam 217 is provided on the outside of the first connecting rod 214; when the first connecting rod 214 rotates, the first cam 217 contacts the bottom of the screen 213; the rotation and lifting action of the first cam 217 causes the screen 213 to vibrate regularly, avoiding material blockage of the mesh and ensuring smooth screening. When the first cam 217 loses contact with the bottom of the screen 213, the connecting spring 2131 returns to its original length so that the screen 213 returns to its initial position; the elastic reset of the connecting spring 2131 ensures that the screen 213 quickly returns to its original position without lifting force, forming a stable reciprocating vibration cycle and improving screening reliability. Furthermore, a movable plate 222 is slidably arranged in the conveying frame 221, and a first connecting frame 223 is provided at the bottom of the conveying frame 221. A connecting post 224 is provided on the first connecting frame 223, and a first spring 225 is sleeved on the outside of the connecting post 224. The two ends of the first spring 225 are fixedly connected to the bottom of the first connecting frame 223 and the movable plate 222, respectively. The elasticity of the first spring 225 causes the movable plate 222 to quickly return to its original position after being struck by the second cam 234, forming a reciprocating shaking effect to prevent material from accumulating in the conveying frame 221. Furthermore, the reverse conveying assembly 23 includes a drive device 2321 mounted on the support frame 231 for driving the conveyor belt 232. The output end of the drive device 2321 is connected to a second connecting rod 233, and a second cam 234 is provided on the outside of the second connecting rod 233. The rotation of the second cam 234 strikes the bottom of the movable plate 222, which, in conjunction with the first spring 225, causes the movable plate 222 to reciprocate and vibrate, thereby enhancing the flowability of the material in the conveying frame 221. When the second connecting rod 233 rotates, the second cam 234 abuts against the bottom of the movable plate 222; the abutting action of the second cam 234 against the movable plate 222 directly drives the movable plate 222 to move, forming a mechanical vibration triggering mechanism to ensure the continuity of material conveying; Furthermore, a dust treatment component 41 is provided on the side of the feed hopper 4. The dust treatment component 41 includes an exhaust fan 411. A second connecting frame 412 is provided on the side of the first treatment frame 1. A dust suction pipe 4121 is provided in the second connecting frame 412. The dust suction pipe 4121 is connected to the dust suction end of the exhaust fan 411. A through hole is provided on the feed hopper 4 for the dust suction pipe 4121 to pass through. The exhaust fan 411 sucks up the dust at the feed hopper 4 through the dust suction pipe 4121, reducing dust pollution in the production environment and providing a material source for subsequent recycling. The exhaust end of the exhaust fan 411 is equipped with a connecting pipe 413. The connecting pipe 413 passes through the second processing frame 2 and faces the interior of the first processing frame 1 to discharge the adsorbed small particles into the first processing frame 1. The connecting pipe 413 directly transports the dust and small particles to the first processing frame 1, realizing the recycling of resources without waste and improving the utilization rate of raw materials. Furthermore, the feed hopper 4 includes a branch pipe 414 connected to the outside of the connecting pipe 413. A filter screen is installed in the branch pipe 414, and an aeration pipe 415 is installed on the side of the branch pipe 414 away from the connecting pipe 413. The aeration pipe 415 is located at the bottom of the inside of the first processing frame 1 to introduce gas into the first processing frame 1 to aerate the mixture in the first processing frame 1 and improve the uniformity of the agent mixing. The branch pipe 414 filters large particulate impurities in the gas through the filter screen and only delivers clean gas to the aeration pipe 415 for bottom aeration, thereby enhancing the mixing effect of the agent and the material. Example 2

[0012] Please see Figures 2-8 Furthermore, in conjunction with Embodiment 1, it is further found that a mixing component 12 is provided in the first processing frame 1. The mixing component 12 includes a first stirring rod 1231 and two second stirring rods 125 rotatably disposed in the first processing frame 1. The combination of the first stirring rod 1231 and the second stirring rods 125 forms a three-dimensional stirring structure, which reduces the stirring dead angle and improves the uniformity of drug mixing. Two second stirring rods 125 are located on both sides of the first stirring rod 1231; the symmetrical arrangement of the second stirring rods 125 on both sides expands the stirring coverage area and forms a bidirectional stirring effect with the first stirring rod 1231, thereby enhancing the mixing efficiency. When the second stirring rod 125 and the first stirring rod 1231 rotate, the mixture in the first processing frame 1 can be stirred to improve the drug processing efficiency; the rotational motion of the stirring rods directly acts on the mixture, promoting rapid dispersion and uniform mixing of the drug, and improving the pretreatment effect. Furthermore, the mixing component 12 includes a connecting frame 121 disposed outside the first processing frame 1, a first bevel gear 1211 rotatably disposed in the connecting frame 121, a sleeve 122 rotatably disposed on the first processing frame 1, and a first stirring rod 1231 fixedly connected to the end of the sleeve 122; the connecting frame 121 serves as a power transmission hub, and power distribution is achieved through the first bevel gear 1211 to ensure the synchronicity of the stirring action; A mounting rod 123 is provided in the connecting frame 121, and a connecting plate 124 is fixed to the end of the mounting rod 123. Two second stirring rods 125 are symmetrically arranged on the connecting plate 124 and are movably connected to the second stirring rods 125. The symmetrical design of the connecting plate 124 ensures the consistency of the movement of the second stirring rods 125, and the movable connection structure allows the stirring rods to be adjusted in angle to adapt to different stirring needs. Furthermore, the mixing component 12 includes a second bevel gear 1221 disposed outside the sleeve 122, the second bevel gear 1221 meshing with the first bevel gear 1211; the second bevel gear 1221 achieves power transmission through meshing with the first bevel gear 1211, driving the first stirring rod 1231 to rotate, forming a stirring power source; A third bevel gear 1232 is provided on the mounting rod 123, and the third bevel gear 1232 meshes with the first bevel gear 1211; the meshing of the third bevel gear 1232 and the first bevel gear 1211 realizes the power input of the mounting rod 123, and provides rotational driving force for the second stirring rod 125; When the third bevel gear 1232 rotates, the second bevel gear 1221 is in a rotating state under the action of the first bevel gear 1211, and the rotation direction of the second bevel gear 1221 is opposite to the rotation direction of the third bevel gear 1232, forming a bidirectional stirring effect; the bidirectional stirring effect generates turbulence through the opposing rotating stirring rod, which enhances the mixing uniformity of the agent and the material and improves the pretreatment quality; Both the outer side of the mounting rod 123 and the outer side of the first connecting rod 214 are provided with first pulleys 126. The two first pulleys 126 are externally connected to a first synchronous belt 127 to achieve coordinated driving of sieving and stirring. The first synchronous belt 127 links the first connecting rod 214 and the mounting rod 123, so that the sieving action and stirring operation are carried out synchronously, improving the coordination and efficiency of the overall process.

[0013] The workflow of the pretreatment device for paper product production is as follows: Raw materials enter the third processing frame 3 through the feed hopper 4. The drive motor 31 drives the crushing roller 32 to rotate through the third pulley 311 and the third synchronous belt 312, thus performing preliminary crushing of the raw materials. The crushed material falls into the screening assembly 21 of the second processing frame 2. The first connecting rod 214 receives the power of the crushing roller 32 and rotates synchronously through the second pulley 215 and the second synchronous belt 216, driving the first cam 217 to periodically lift the screen 213. With the elastic reset of the connecting spring 2131, the screen 213 vibrates back and forth in an inclined state, achieving efficient screening. Large particles that do not pass through the screen enter the conveying frame 221 through the return hopper 22. The drive device 2321 of the reverse conveying assembly 23 drives the second connecting rod 233 to rotate. The second cam 234 rotates accordingly and periodically strikes the bottom of the movable plate 222. Under the elastic action of the first spring 225, the movable plate 222 vibrates back and forth along the connecting column 224 to avoid material accumulation. At the same time, the conveyor belt 232... The material is reverse-transported to the feed hopper 4 for secondary crushing; the undersized fine particles and dust sucked by the dust treatment component 41 are directly transported to the inside of the first treatment frame 1 through the connecting pipe 413, realizing the recycling of dust and small particles without waste; the branch pipe 414, under the action of the filter screen, transports the filtered gas to the aeration pipe 415 for aeration at the bottom of the first treatment frame 1, promoting the uniformity of mixing of the agent and the material; the mixing component 12 receives the power of the first connecting rod 214 through the first pulley 126 and the first synchronous belt 127, and the first bevel gear 1211 drives the second bevel gear 1221 and the third bevel gear 1232 to rotate in opposite directions, driving the first stirring rod 1231 and the second stirring rods 125 on both sides to form a bidirectional stirring effect, enhancing the mixing efficiency of the agent and the material, and finally completing the pretreatment process of paper product raw materials; the whole process realizes the coordinated operation of crushing, screening, recycling, dust removal and mixing through mechanical transmission, and the operation of each component is smooth, ensuring stable and reliable pretreatment effect and efficient resource utilization.

[0014] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A pretreatment device for paper product manufacturing, comprising a first treatment frame (1), a second treatment frame (2), a third treatment frame (3), and a feed hopper (4) arranged from bottom to top, wherein the first treatment frame (1) is provided with an injection hole for adding reagents and a discharge pipe (11) for discharging treated raw materials, characterized in that: The third processing frame (3) has two interlocking crushing rollers (32) rotatably arranged. The second processing frame (2) is provided with a sieving component (21), the sieving component (21) includes a mounting column (211) provided in the second processing frame (2), a movable frame (212) is slidably provided on the outside of the mounting column (211), a screen (213) is provided on the movable frame (212), and the screen (213) is inclined in the second processing frame (2); A return hopper (22) is provided on the side of the second processing frame (2), and a conveying frame (221) is provided on the side of the return hopper (22). The conveying frame (221) is inclined, and a reverse conveying component (23) for conveying unqualified raw materials to the feed hopper (4) is provided on the conveying frame (221). The reverse conveying component (23) includes a support frame (231), and a conveyor belt (232) is provided above the support frame (231). The surface of the conveyor belt (232) is provided with anti-slip texture to improve transportation stability.

2. The pretreatment device for paper product production according to claim 1, characterized in that: A drive motor (31) is provided on the side of the first processing frame (1). The output shaft of the drive motor (31) and the end of one of the crushing rollers (32) are both provided with a third pulley (311). A third synchronous belt (312) is connected to the two third pulleys (311).

3. The pretreatment device for paper product production according to claim 2, characterized in that: The screening assembly (21) includes a first connecting rod (214) rotatably disposed in the second processing frame (2). The first connecting rod (214) and one end of the crushing roller (32) are provided with second pulleys (215). The two second pulleys (215) are externally connected to a second synchronous belt (216) to realize the power transmission of crushing and screening. A connecting spring (2131) is sleeved on the outside of the mounting column (211), and one end of the connecting spring (2131) is fixedly connected to the outside of the movable frame (212). The first connecting rod (214) is provided with a first cam (217) on its exterior. When the first connecting rod (214) rotates, the first cam (217) contacts the bottom of the screen (213); When the first cam (217) loses contact with the bottom of the screen (213), the connecting spring (2131) returns to its original length so that the screen (213) returns to its initial position.

4. The pretreatment device for paper product production according to claim 1, characterized in that: A movable plate (222) is slidably arranged in the feeding frame (221). A first connecting frame (223) is provided at the bottom end of the feeding frame (221). A connecting column (224) is provided on the first connecting frame (223). A first spring (225) is sleeved on the outside of the connecting column (224). The two ends of the first spring (225) are fixedly connected to the bottom of the first connecting frame (223) and the movable plate (222), respectively.

5. A pretreatment device for paper product production according to claim 4, characterized in that: The reverse conveying assembly (23) includes a drive device (2321) mounted on a support frame (231) for driving the conveyor belt (232). The output end of the drive device (2321) is connected to a second connecting rod (233), and a second cam (234) is provided on the outside of the second connecting rod (233). When the second connecting rod (233) rotates, the second cam (234) abuts against the bottom of the movable plate (222).

6. A pretreatment device for paper product production according to claim 1, characterized in that: A dust treatment component (41) is provided on the side of the feeding hopper (4). The dust treatment component (41) includes a blower (411). A second connecting frame (412) is provided on the side of the first treatment frame (1). A dust suction pipe (4121) is provided in the second connecting frame (412). The dust suction pipe (4121) is connected to the dust suction end of the blower (411). A through hole is provided on the feeding hopper (4) for the dust suction pipe (4121) to pass through. The exhaust end of the blower (411) is provided with a connecting pipe (413), which passes through the second processing frame (2) and faces the interior of the first processing frame (1) to discharge the adsorbed small particles into the first processing frame (1).

7. A pretreatment device for paper product production according to claim 6, characterized in that: The feed hopper (4) includes a branch pipe (414) connected to the outside of the connecting pipe (413). A filter screen is provided in the branch pipe (414). An aeration pipe (415) is provided on the side of the branch pipe (414) away from the connecting pipe (413). The aeration pipe (415) is located at the bottom inside the first processing frame (1) to introduce gas into the first processing frame (1) to aerate the mixture in the first processing frame (1) and improve the uniformity of the drug mixture.

8. A pretreatment device for paper product production according to claim 3, characterized in that: The first processing frame (1) is provided with a mixing component (12), which includes a first stirring rod (1231) and two second stirring rods (125) rotatably disposed in the first processing frame (1). Two second stirring rods (125) are located on both sides of the first stirring rod (1231); When the second stirring rod (125) and the first stirring rod (1231) rotate, the mixture in the first processing frame (1) can be stirred to improve the drug processing efficiency.

9. A pretreatment device for paper product production according to claim 8, characterized in that: The mixing component (12) includes a connecting frame (121) disposed outside the first processing frame (1), a first bevel gear (1211) is rotatably disposed in the connecting frame (121), a sleeve (122) is rotatably disposed on the first processing frame (1), and the first stirring rod (1231) is fixedly connected to the end of the sleeve (122); The connecting frame (121) is provided with an installation rod (123), and the end of the installation rod (123) is fixed with a connecting plate (124). Two second stirring rods (125) are symmetrically arranged on the connecting plate (124) and are movably connected to the second stirring rods (125).

10. A pretreatment device for paper product production according to claim 9, characterized in that: The mixing component (12) includes a second bevel gear (1221) disposed outside the sleeve (122), the second bevel gear (1221) meshing with the first bevel gear (1211); The mounting rod (123) is provided with a third bevel gear (1232), which meshes with the first bevel gear (1211); When the third bevel gear (1232) rotates, the second bevel gear (1221) is in a rotating state under the action of the first bevel gear (1211), and the rotation direction of the second bevel gear (1221) is opposite to the rotation direction of the third bevel gear (1232), forming a bidirectional stirring effect; The installation rod (123) and the first connecting rod (214) are both provided with first pulleys (126), and the two first pulleys (126) are externally connected to a first synchronous belt (127) to achieve coordinated driving of sieving and stirring.

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