Pulper for production of paper mill

Abstract

The invention relates to the technical field of pulpers, and provides a pulper for paper mill production, which comprises a tank body, a screen, an impeller and a blade, the screen is fixedly connected in the tank body, the impeller is rotatably arranged at the bottom of the tank body, the blade is fixedly connected to the inner wall of the tank body, and the pulper also comprises a feeding mechanism, a steam heating mechanism and a steam recovery mechanism, the feeding mechanism is used for conveying materials into the tank body and comprises a conveying belt and a protective cover, an outlet of the conveying belt is located above the tank body, the steam heating mechanism is used for conveying steam into the tank body, and the steam recycling mechanism is used for recycling steam to preheat and clean raw materials and comprises a vacuum pump and a preheating box. An extraction opening of the vacuum pump is communicated with the top of the tank body; the preheating box is communicated with an air outlet of the vacuum pump through a preheating pipe. Through the technical scheme, the problem of resource waste caused by direct discharge of heating steam in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the technical field of pulpers, and in particular to a pulper used in paper mill production. Background Art

[0002] A pulper is a machine used for disintegration, fluidization and dispersion in the wet nonwoven and papermaking industries. It can convert broken paper and waste paper in the pulp board production process into fibrous pulp. In the wet nonwoven fabric process, a hydraulic pulper can be used to dissociate fibers into single fibers. It is widely used in the recycling of waste paper in paper mills.

[0003] The pulper drives the impeller to rotate through the turntable at the bottom of the trough. At the same time, a bottom knife ring is provided at the bottom of the trough. The rotation of the impeller causes the pulp in the trough to be sucked in along the center of the axis and thrown out from the circumference at high speed, forming a violent turbulent circulation. Due to the tearing of the impeller blades and the mutual disturbance of pulp flow layers at different speeds, a huge friction effect is generated, which makes the pulp strongly disintegrate and separate the fibers in the wet state. At the same time, the fiber bundles rub against each other in the gap between the impeller and the screen plate, increasing the fiberization effect.

[0004] When waste paper is pulped for recycling, the waste paper is collected from garbage recycling stations or other recycling places, and the surface is easily stained. After pulping, the pulp needs to be filtered and purified to screen out the stains and ink. At the same time, the pulp is usually crushed under high temperature. The current pulper generally uses steam heating, and the steam is directly introduced into the pulper from the bottom of the tank, mixed with the pulp or pulping white water for heating. The direct discharge of the heated steam will cause waste of resources and thermal pollution. Therefore, we propose a pulper for paper mill production, which can recycle steam and reduce waste of resources. Summary of the invention

[0005] The invention provides a pulper for paper mill production, which solves the problem of waste of resources caused by direct discharge of heating steam in the related art.

[0006] The technical solution of the present invention is as follows: A pulper for paper mill production, comprising a trough, a screen, an impeller and a blade, wherein the screen is fixedly connected to the inside of the trough, the impeller is rotatably arranged at the bottom of the trough, the blade is fixedly connected to the inner wall of the trough, and further comprising: A feeding mechanism, which is used to transport materials into the interior of the tank body, and includes: A conveyor belt, wherein the outlet of the conveyor belt is located above the trough body; A protective cover, wherein a cover plate is fixedly connected to the top of the trough body, the protective cover is fixedly connected above the cover plate, the outlet of the conveyor belt is located inside the protective cover, and a feed port is opened on the cover plate; A steam heating mechanism, the steam heating mechanism is used to transport steam into the interior of the tank body, the steam heating mechanism comprises: A steam chamber, the steam chamber is arranged inside the side wall of the tank body, and the steam chamber is connected to an air inlet pipe; An air supply pipe, the air supply pipe is connected to the steam chamber, and the air supply pipe is located inside the tank body; A nozzle, wherein a plurality of nozzles are provided and the nozzles are connected to the air supply pipe; A steam recovery mechanism, the steam recovery mechanism is used to recover steam to preheat and clean the raw materials, and the steam recovery mechanism includes: A vacuum pump, wherein the vacuum port of the vacuum pump is connected to the top of the tank body; A preheating box is located at the inlet of the conveyor belt and is connected to the air outlet of the vacuum pump through a preheating pipe.

[0007] In order to improve the mixing effect of steam and slurry, the air supply pipe and the steam chamber are rotatably connected, and the air supply pipe and the impeller are drivingly connected.

[0008] In order to realize the transmission connection between the air supply pipe and the impeller, the air supply pipe is connected to the impeller through a transmission assembly, and the transmission assembly includes: A transmission shaft, the transmission shaft is fixedly connected to the impeller; A driving bevel gear, wherein the driving bevel gear is fixedly connected to the transmission shaft; A driven bevel gear is fixedly connected to the air supply pipe, and the driven bevel gear is meshed with the driving bevel gear.

[0009] In order to further improve the mixing effect of steam and slurry, a plurality of air supply pipes are provided, and a sprocket is fixedly mounted on the outside of the air supply pipe. The plurality of sprockets located on the same side are connected by chain transmission.

[0010] In order to assist the material to enter the interior of the tank, an auxiliary feeding assembly is installed on the protective cover, and the auxiliary feeding assembly includes: A rotating shaft, the rotating shaft is rotatably arranged on the protective cover, and the rotating shaft is drivingly connected to the conveyor belt; A toggle plate, wherein a plurality of toggle plates are provided and the toggle plates are fixedly connected to the outside of the rotating shaft.

[0011] In order to assist the material to fall into the feed port, a slide plate is fixedly connected to the interior of the protective cover, and the slide plate is located below the outlet of the conveyor belt.

[0012] In order to prevent the material from affecting the transmission assembly, the outside of the transmission shaft is rotatably connected to a transmission box, the driving bevel gear and the driven bevel gear are located inside the transmission box, and the air supply pipe is rotatably connected to the transmission box.

[0013] In order to assist in the transportation of materials, a mixing component is also included, and the mixing component is used to mix the materials and steam in the preheating box. The mixing component includes: A stirring shaft, the stirring shaft is rotatably connected to the interior of the preheating box, and the stirring shaft is drivingly connected to the conveyor belt; A stirring rod is fixedly connected to the outside of the stirring shaft.

[0014] The working principle and beneficial effects of the present invention are: 1. In the present invention, the material is conveyed to the inside of the protective cover by a conveyor belt and enters the inside of the tank body through the feed port, water is added to the inside of the tank body, and the pulp in the tank body is sucked along the center of the axis by the rotation of the impeller and thrown out from the circumference at high speed, forming a violent turbulent circulation. Due to the tearing of the impeller blades and the mutual disturbance of pulp flow layers at different speeds, a huge friction effect is generated, which makes the pulp strongly disintegrate and separate fibers in a wet state. At the same time, the fiber bundles rub against each other in the gap between the impeller and the screen plate. The impeller and the screen cooperate to shear the pulp, and the pulp that meets the requirements falls through the screen and is discharged, completing the crushing of the pulp.

[0015] 2. In the present invention, high-temperature steam is transported to the interior of the steam chamber through the air inlet pipe to heat the tank body, and the air supply pipe and the nozzle transport the steam to the interior of the tank body to mix with the slurry. At the same time, the impeller drives the air supply pipe and the nozzle to rotate, and the slurry is mechanically and pneumatically stirred to improve the crushing efficiency of the slurry.

[0016] 3. In the present invention, excess steam is delivered to the interior of the preheating box by a vacuum pump, and the steam preheats and humidifies the material, which is convenient for subsequent material crushing and recycling. At the same time, the stirring shaft drives the stirring rod to stir the material, thereby improving the preheating effect of the material. At the same time, the stirring rod pushes the material to the conveyor belt to assist in feeding.

[0017] 4. In the present invention, the conveyor belt drives the rotating shaft and the toggle plate to rotate, thereby assisting in pushing the materials conveyed by the conveyor belt into the interior of the protective cover. At the same time, the toggle plate can seal the opening of the protective cover to a certain extent, reduce the overflow of steam, and ensure full utilization of the steam. 5. Therefore, compared with the pulper in the prior art, the present invention conveys the material to the interior of the tank body through the conveyor belt, fully mixes the steam and the material through the air supply pipe, and conveys the excess steam to the interior of the preheating box through the vacuum pump to preheat the material, thereby improving the utilization efficiency of the steam. At the same time, the steam humidifies the material, and stirs the material through the stirring shaft and the stirring rod to improve the mixing efficiency of the material and the steam. At the same time, in cooperation with the conveyor belt, heavier impurities are retained in the preheating box, thereby reducing the impurities from entering the interior of the tank body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] Figure 1 It is a schematic structural diagram of the first viewing angle of the entire present invention; Figure 2 It is a structural schematic diagram of the second viewing angle of the whole invention; Figure 3 It is a schematic diagram of the structure of a partial cross-section of the present invention; Figure 4 It is a schematic diagram of the structure of the tank body, screen, impeller and steam heating mechanism of the present invention; Figure 5 It is a schematic diagram of the structure of the impeller, air supply pipe, nozzle and transmission assembly of the present invention; Figure 6 It is a structural schematic diagram of the auxiliary feeding assembly of the present invention; Figure 7 It is a schematic diagram of the structure of the mixing component of the present invention.

[0020] In the figure: 1. Tank; 2. Screen; 3. Impeller; 4. Blade; 5. Discharge cylinder; 6. Discharge pipe; 7. Turntable; 8. Sprocket; 9. Chain; 101, conveyor belt; 102, protective cover; 103, cover plate; 104, slide plate; 201, rotating shaft; 202, shifting plate; 203, driving gear; 204, driven gear; 301, steam chamber; 302, air supply pipe; 303, nozzle; 304, air inlet pipe; 401, transmission shaft; 402, driving bevel gear; 403, driven bevel gear; 404, transmission box; 501, vacuum pump; 502, preheating box; 503, preheating tube; 601, stirring shaft; 602, stirring rod; 603, active bevel gear; 604, transmission rod; 605, passive bevel gear. DETAILED DESCRIPTION

[0021] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] like Figures 1 to 7 As shown, this embodiment proposes a pulping machine for paper mill production, including a tank body 1, a screen 2, an impeller 3 and a blade 4, the screen 2 is fixedly connected to the inside of the tank body 1, a discharge cylinder 5 is fixedly connected to the inner bottom wall of the tank body 1, the screen 2 is fixedly connected to the discharge cylinder 5, the bottom of the tank body 1 is connected to a discharge pipe 6, the discharge pipe 6 is located inside the discharge cylinder 5, the impeller 3 is rotatably arranged at the bottom of the tank body 1, the impeller 3 is in contact with the top of the screen 2, the blade 4 is fixedly connected to the inner wall of the tank body 1, the impeller 3 is connected to a turntable 7, the turntable 7 and the output end of the motor are connected by a belt, the turntable 7 and the impeller 3 can be driven to rotate by the motor, the impeller 3 rotates so that the pulp in the tank body 1 is sucked in along the center of the axis and thrown out from the circumference at high speed to form a violent turbulent circulation, the impeller 3 and the screen 2 cooperate to shear the pulp, and at the same time the blade 4 on the inner wall of the tank body 1 breaks the pulp, due to the tearing of the impeller 3 wings and the mutual disturbance of pulp flow layers at different speeds, a A huge friction effect causes the pulp to be strongly disintegrated and separated from the fibers in a wet state. At the same time, the fiber bundles rub against each other in the gap between the impeller 3 and the screen plate, thereby increasing the fiberization effect. The screen 2 filters the crushed pulp, and the crushed pulp is discharged through the discharge pipe 6 for subsequent treatment. The invention also includes a feeding mechanism, a steam heating mechanism and a steam recovery mechanism. Compared with the pulper in the prior art, the present invention conveys the material to the inside of the tank body 1 through the conveyor belt 101, fully mixes the steam and the material through the air supply pipe 302, and conveys the excess steam to the inside of the preheating box 502 through the vacuum pump 501 to preheat the material, thereby improving the utilization efficiency of the steam. At the same time, the steam humidifies the material, and stirs the material through the stirring shaft 601 and the stirring rod 602, thereby improving the mixing efficiency of the material and the steam. At the same time, in cooperation with the conveyor belt 101, the heavier impurities are retained in the inside of the preheating box 502, thereby reducing the impurities from entering the inside of the tank body 1.

[0023] The feeding mechanism is used to transport materials into the interior of the trough body 1. The feeding mechanism includes a conveyor belt 101 and a protective cover 102. The outlet of the conveyor belt 101 is located above the trough body 1. A cover plate 103 is fixedly connected to the top of the trough body 1. The protective cover 102 is fixedly connected to the top of the cover plate 103. The outlet of the conveyor belt 101 is located inside the protective cover 102. An opening is provided on the protective cover 102. The conveyor belt 101 enters the interior of the protective cover 102 through the opening. A feeding port is provided on the cover plate 103. Materials such as waste paper are placed on the conveyor belt 101, and the materials are transported to the protective cover 102 through the conveyor belt 101. The material is fed into the interior of the tank body 1 through the feed inlet for pulping. The cover plate 103 and the protective cover 102 make the tank body 1 in a relatively closed environment to reduce the escape of steam, thereby facilitating the recycling of the steam. In order to assist the material to fall into the feed inlet, a slide plate 104 is fixedly connected to the interior of the protective cover 102. The slide plate 104 is located below the outlet of the conveyor belt 101. When the conveyor belt 101 transports the material to the interior of the protective cover 102, which is the highest position, the material falls from the conveyor belt 101 and is received by the slide plate 104. The material slides along the slide plate 104 to the feed inlet and enters the interior of the tank body 1 for pulping.

[0024] In order to assist the material to enter the interior of the tank body 1, an auxiliary feeding assembly is installed on the protective cover 102, and the auxiliary feeding assembly includes a rotating shaft 201 and a toggle plate 202. The rotating shaft 201 is rotatably arranged on the protective cover 102, and the rotating shaft 201 is transmission-connected to the conveyor belt 101. A plurality of toggle plates 202 are provided, and the toggle plates 202 are fixedly connected to the outside of the rotating shaft 201. The conveyor belt 101 includes two rollers and belts wound around the outside of the two rollers. A driving gear 203 is coaxially fixedly sleeved on the roller located at the upper position. The outer fixed sleeve of the rotating shaft 201 is provided with a driven gear 204, and the driven gear 204 is meshed with the driving gear 203. When the conveyor belt 101 is running to transport the material, the roller drives the rotating shaft 201 and the toggle plate 202 to rotate. The roller and the rotating shaft 201 rotate in opposite directions. The toggle plate 202 and the conveyor belt 101 are close to each other. The side drives the material to move into the protective cover 102. At the same time, the toggle plate 202 blocks the opening of the protective cover 102 to a certain extent, thereby reducing the escape of steam in the trough body 1 through the opening.

[0025] The steam heating mechanism is used to transport steam to the interior of the tank body 1. The steam heating mechanism includes a steam chamber 301, an air supply pipe 302 and a nozzle 303. The steam chamber 301 is arranged inside the side wall of the tank body 1. The steam chamber 301 is connected to an air inlet pipe 304. The air supply pipe 302 is connected to the steam chamber 301. The air supply pipe 302 is located inside the tank body 1. A plurality of nozzles 303 are arranged. The nozzles 303 are connected to the air supply pipe 302. The air inlet pipe 304 is connected to a steam generating device. The steam generating device produces steam and sends it into the steam chamber 301 through the air inlet pipe 304 to heat the tank body 1. The steam is sent into the interior of the tank body 1 through the air inlet pipe 304 and the nozzle 303 to mix with the slurry, heat the slurry, and promote the crushing of the slurry.

[0026] In order to improve the mixing effect of steam and slurry, the air supply pipe 302 and the steam chamber 301 are rotatably connected, and the air supply pipe 302 is connected to the impeller 3 by transmission. In order to realize the transmission connection between the air supply pipe 302 and the impeller 3, the air supply pipe 302 is connected to the impeller 3 by transmission through a transmission assembly. The transmission assembly includes a transmission shaft 401, a driving bevel gear 402 and a driven bevel gear 403. The transmission shaft 401 is fixedly connected to the impeller 3, the driving bevel gear 402 is fixedly connected to the transmission shaft 401, and the driven bevel gear 403 is fixedly connected to the air supply pipe 302. The driven bevel gear 403 is meshed with the driving bevel gear 402. In order to avoid the influence of the material on the transmission assembly, the outer part of the transmission shaft 401 is rotatably connected with a transmission box 404, and the driving bevel gear 402 and the driven bevel gear 403 are located inside the transmission box 404. The air supply pipe 302 and the transmission box 404 are rotatably connected. In order to further improve the mixing effect of steam and slurry, In order to improve the mixing effect, multiple air supply pipes 302 are arranged, and a sprocket 8 is fixedly mounted on the outside of the air supply pipe 302. The multiple sprockets 8 on the same side are connected by a chain 9. The impeller 3 drives the transmission shaft 401 and the driving bevel gear 402 to rotate, thereby driving the driven bevel gear 403 and the air supply pipe 302 to rotate. The multiple air supply pipes 302 are rotated through the transmission connection of the sprocket 8 and the chain 9. The air supply pipe 302 and the nozzle 303 rotate to mechanically stir the slurry. At the same time, steam is sent into the slurry through the nozzle 303 to heat the slurry and pneumatically stir it to improve the pulping effect. A protection box is also arranged on the outside of the sprocket 8 and the chain 9. The air supply pipe 302 is rotatably connected to the protection box. The driving bevel gear 402 and the driven bevel gear 403 are protected by the transmission box 404, and the sprocket 8 and the chain 9 are protected by the protection box to prevent the pulp from getting stuck and affecting the transmission.

[0027] The steam recovery mechanism is used to recover steam to preheat and clean the raw materials. The steam recovery mechanism includes a vacuum pump 501 and a preheating box 502. The air suction port of the vacuum pump 501 is connected to the top of the tank body 1. The preheating box 502 is located at the inlet of the conveyor belt 101. The preheating box 502 is connected to the air outlet of the vacuum pump 501 through the preheating pipe 503. The vacuum pump 501 transports excess hot air to the inside of the preheating box 502 through the preheating pipe 503. The material is placed inside the preheating box 502. The hot steam contains a large amount of moisture, which can preheat and humidify the material.

[0028] In order to assist in the transportation of materials, a mixing component is also included. The mixing component is used to mix the materials and steam in the preheating box 502. The mixing component includes a stirring shaft 601 and a stirring rod 602. The stirring shaft 601 is rotatably connected to the inside of the preheating box 502. The stirring shaft 601 is transmission-connected to the conveyor belt 101. The stirring rod 602 is fixedly connected to the outside of the stirring shaft 601. A driving bevel gear 603 is fixedly connected to the roller located below. A transmission rod 604 is rotatably connected to the frame of the conveyor belt 101. One end of the transmission rod 604 is fixedly connected to a passive bevel gear 605. The passive bevel gear 605 is meshed with the active bevel gear 603. The transmission rod 604 and The stirring shaft 601 is connected through the sprocket 8 and the chain 9. The rotation of the roller on the conveyor belt 101 drives the transmission rod 604 and the stirring shaft 601 to rotate. The stirring shaft 601 drives the stirring rod 602 to stir the material in the preheating box 502, so that the hot air and the material are fully mixed and the material is wetted. When the hot air with moisture and the material are mixed, the stirring rod 602 stirs the wet material, which can sweep off some impurities on the surface of the material and retain them inside the preheating box 502. The stirring rod 602 pushes the material to move inside the preheating box 502, and some of the material pushed to the conveyor belt 101 is transported to the inside of the protective cover 102 and the tank body 1 for pulping.

[0029] The working principle or use process of the pulper used in the paper mill is as follows: Put waste paper and other materials into the preheating box 502, turn on the conveyor belt 101, and the conveyor belt 101 conveys part of the materials upward to the inside of the protective cover 102. At the same time, the conveyor belt 101 drives the rotating shaft 201 and the toggle plate 202 to rotate, and the toggle plate 202 assists in pushing the materials into the inside of the protective cover 102. The conveyor belt 101 drives the stirring shaft 601 and the stirring rod 602 to rotate, stirring the materials in the preheating box 502, and assists in pushing the materials to the conveyor belt 101; Water is added to the inside of the tank body 1, and the turntable 7 drives the impeller 3 to rotate, and cooperates with the blade 4 and the screen 2 to crush the pulp. After crushing, the pulp that meets the standards falls through the screen 2 and is discharged through the discharge pipe 6 for subsequent treatment. During the pulping process, the external steam generating device generates steam and transports it to the inside of the steam chamber 301 through the air inlet pipe 304 to heat the tank body 1. The steam enters the inside of the pulp through the air supply pipe 302 and the nozzle 303. At the same time, the impeller 3 drives the air supply pipe 302 to rotate to stir the pulp. The vacuum pump 501 delivers the excess moist hot air into the interior of the preheating box 502 to mix the hot air with the material, thereby preheating and humidifying the material to facilitate subsequent pulping of the material.

[0030] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pulper for paper mill production, comprising a trough body (1), a screen (2), an impeller (3) and a blade (4), wherein the screen (2) is fixedly connected to the inside of the trough body (1), the impeller (3) is rotatably arranged at the bottom of the trough body (1), and the blade (4) is fixedly connected to the inner wall of the trough body (1), characterized in that: It also includes a feeding mechanism, a steam heating mechanism and a steam recovery mechanism; The feeding mechanism is used to transport materials into the interior of the tank body (1); The steam heating mechanism is used to transport steam into the interior of the tank body (1); The steam recovery mechanism is used to recover steam to preheat and clean the raw materials, and the steam recovery mechanism includes: A vacuum pump (501), wherein an air suction port of the vacuum pump (501) is connected to the top of the tank body (1); A preheating box (502), wherein the preheating box (502) is connected to the air outlet of the vacuum pump (501) via a preheating pipe (503).

2. A pulper for paper mill production according to claim 1, characterized in that: The feeding mechanism comprises: A conveyor belt (101), wherein an outlet of the conveyor belt (101) is located above the trough body (1); A protective cover (102), a cover plate (103) is fixedly connected to the top of the trough body (1), the protective cover (102) is fixedly connected above the cover plate (103), the outlet of the conveyor belt (101) is located inside the protective cover (102), and a feed port is provided on the cover plate (103).

3. A pulper for paper mill production according to claim 2, characterized in that: The steam heating mechanism comprises: A steam chamber (301), the steam chamber (301) being arranged inside a side wall of the tank body (1), the steam chamber (301) being connected to an air inlet pipe (304); an air supply pipe (302), the air supply pipe (302) being in communication with the steam chamber (301), and the air supply pipe (302) being located inside the tank body (1); A nozzle (303), wherein a plurality of nozzles (303) are provided, and the nozzles (303) are connected to the air supply pipe (302).

4. A pulper for paper mill production according to claim 3, characterized in that: The air supply pipe (302) is rotatably connected to the steam chamber (301), and the air supply pipe (302) is transmission-connected to the impeller (3).

5. A pulper for paper mill production according to claim 4, characterized in that: The air supply pipe (302) is transmission-connected to the impeller (3) via a transmission assembly, wherein the transmission assembly comprises: A transmission shaft (401), the transmission shaft (401) being fixedly connected to the impeller (3); A driving bevel gear (402), wherein the driving bevel gear (402) is fixedly connected to the transmission shaft (401); A driven bevel gear (403), wherein the driven bevel gear (403) is fixedly connected to the air supply pipe (302), and the driven bevel gear (403) is meshed with the driving bevel gear (402).

6. A pulper for paper mill production according to claim 5, characterized in that: A plurality of the air supply pipes (302) are provided, and a sprocket (8) is fixedly sleeved on the outside of the air supply pipe (302), and the plurality of sprockets (8) located on the same side are connected in transmission via a chain (9).

7. A pulper for paper mill production according to claim 6, characterized in that: An auxiliary feeding assembly is installed on the protective cover (102), and the auxiliary feeding assembly comprises: A rotating shaft (201), the rotating shaft (201) being rotatably disposed on the protective cover (102), the rotating shaft (201) being drivingly connected to the conveyor belt (101); A toggle plate (202), wherein a plurality of the toggle plates (202) are provided, and the toggle plates (202) are fixedly connected to the outside of the rotating shaft (201).

8. A pulper for paper mill production according to claim 7, characterized in that: A slide plate (104) is fixedly connected to the interior of the protective cover (102), and the slide plate (104) is located below the outlet of the conveyor belt (101).

9. A pulper for paper mill production according to claim 8, characterized in that: The transmission shaft (401) is rotatably connected to a transmission box (404) on the outside, the driving bevel gear (402) and the driven bevel gear (403) are located inside the transmission box (404), and the air supply pipe (302) is rotatably connected to the transmission box (404).

10. A pulper for paper mill production according to claim 9, characterized in that: It also includes a mixing component, which is used to mix the material and steam in the preheating box (502), and the mixing component includes: A stirring shaft (601), the stirring shaft (601) being rotatably connected to the interior of the preheating box (502), and the stirring shaft (601) being transmission-connected to the conveyor belt (101); A stirring rod (602), wherein the stirring rod (602) is fixedly connected to the outside of the stirring shaft (601).

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