A preparation device and preparation process of low-viscosity polyanionic cellulose

Abstract

The present invention relates to the field of cellulose processing technology, and specifically to a preparation device for low-viscosity anionic cellulose and a preparation process thereof, comprising multiple rows of rake rods, a rake shaft, two discharge plates and a reaction tank fixed on a mounting frame. In the preparation device for low-viscosity anionic cellulose, the ends of the rake rods can contact the inner wall of the reaction tank during drying to avoid the phenomenon of sticking to the bottom. After drying is completed, the dried cellulose is discharged by being pushed by the discharge plate. The edge of the discharge plate will not be penetrated, and the discharge plate can be pushed as a whole. While the rake rod is moving, the rake rod will rotate along the rotating column through the inclined groove, so that the end of the rake rod rotates to be parallel to the axis of the rake shaft, avoiding the rake rod end being too long and causing the avoidance hole to be larger, reducing the residual amount when the fiber bundle is pushed for the first time, and facilitating the discharge of the dried cellulose. And by pushing the discharge plate in this way, the number of rake rods will not be limited, so that the length of the reaction tank can be freely controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of cellulose processing, and in particular to a device for preparing low-viscosity polyanionic cellulose. Background Art

[0002] The production of carboxymethyl cellulose and polyanionic cellulose both requires the use of vacuum rake dryers for drying. Chinese Patent Application No. CN202210024802.0, "Carboxymethyl Cellulose and Polyanionic Cellulose Rake Dryer Discharge Device," discloses the vacuum rake dryer structure used for drying cellulose. However, after drying, the cellulose is difficult to discharge, and how to expel the cellulose remains a challenge in the field.

[0003] In order to solve the problem of pushing out materials, Chinese patent application number: CN202411448266.2, a rake-type vacuum dryer is disclosed, which drives the push plate and rake rod along the rake rod toward the discharge port through a power source, and sets a push plate and slides the stirring rake on the rake rod. When the material remains on both sides of the discharge port, the push plate and rake rod are driven by the power source to move toward the middle, thereby ensuring the sealing of the drying liner while moving the material to the discharge port to prevent excessive accumulation of material. Cellulose is squeezed out by air pressure, but the number of rake rods on it is limited because its final extrusion stacking thickness is limited, and its rake rods do not contact the inner wall of the reaction tank, and the reaction tank will generate more heat, and the bottom will become sticky after long-term operation.

[0004] Therefore, a low-viscosity polyanionic cellulose preparation device and preparation process are needed, which can facilitate the discharge of dried cellulose, and the rake rods contact the inner wall of the reaction tank to avoid sticking to the bottom, and the number of rake rods is not limited, so that the length of the reaction tank can be freely controlled. Summary of the Invention

[0005] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a preparation device and a preparation process of low-viscosity polyanionic cellulose, which can facilitate the discharge of the dried cellulose, and the rake rods are in contact with the inner wall of the reaction tank to avoid sticking to the bottom, and the number of rake rods is not limited, so that the length of the reaction tank can be freely controlled.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: the present invention provides a preparation device for low-viscosity polyanionic cellulose, comprising multiple rows of rake rods, rake shafts, two discharge plates and a reaction tank fixed on a mounting frame, wherein the multiple rake rods are fixedly mounted on the outer edge of the rake shaft, the rake shaft is rotatably mounted in the reaction tank, a rotary driver for driving the rake shaft to rotate is fixedly arranged on the outside of the reaction tank, the two discharge plates are respectively located on both sides of the interior of the reaction tank, and each discharge plate is provided with multiple avoidance holes for horizontal passage of multiple rows of rake rods, and a passing hole is provided between two adjacent avoidance holes, and a linear pusher is provided on the reaction tank for pushing the two discharge plates to move inward.

[0007] Preferably, an inner pulling mechanism for pulling the multiple rows of rake rods to move inward synchronously and a rotating mechanism for driving the ends of the multiple rows of rake rods to rotate parallel to the axis of the rake shaft are fixedly provided inside the rake shaft.

[0008] Preferably, the inner pulling mechanism includes a linear pushing mechanism and multiple inner pulling units, and the multiple inner pulling units correspond to two rake rods respectively. Each inner pulling unit includes a pull rod, a guide sleeve, a linear pushing mechanism, a hinge rod and a rotating sleeve. The guide sleeves on the multiple inner pulling units are fixedly connected to each other, and the guide sleeves at the head and tail ends are fixedly connected to the rake shaft. The pull rods on the multiple inner pulling units are fixedly connected to each other, and the outer edge of the pull rod fits into the inner edge of the guide sleeve. The pull rod at the end is rotatably connected to the driving end of the linear pushing mechanism. A guide tube 1 for sliding connection of the rake rod is provided on the outer edge of the guide sleeve, and an annular groove for inserting the guide tube 1 is provided at the bottom of the rake rod. A plug-in column 1 is formed between the rake rod and the annular groove, and the bottom of the plug-in column 1 is rotatably connected to the rotating sleeve. One end of the hinge rod is hinged to the rotating sleeve, and the other end of the hinge rod is hinged to the pull rod. An avoidance groove for sliding of the hinge rod is provided at the junction of the guide tube 1 and the guide sleeve.

[0009] Preferably, the rotating mechanism includes a rotating column and an inclined slot, two rotating columns are fixedly provided on the outer edge of the conduit, and an inclined slot for the rotating columns to slide is provided on the outer edge of the rake rod.

[0010] Preferably, the linear pushing mechanism includes a rotating shaft, a connecting plate and two electric push rods, the two electric push rods are fixedly installed on the outer edge of the reaction tank, the connecting plate is fixedly installed on the ends of the two electric push rods, and one end of the rotating shaft is rotatably connected to the connecting plate.

[0011] Preferably, the linear pusher includes two rows of push rods, and the reaction tank is provided with guide holes for the push rods to pass through. Before the discharge plate is pushed, the discharge plate covers the guide holes, and a strong magnet is fixedly provided in the area where the discharge plate contacts the push rods.

[0012] Preferably, two plug posts 2 and two conduits 2 are fixedly provided on each discharge plate, the outer edges of the two conduits 2 are clamped on the outer edges of one or more rake rods, and the plug posts 2 on one discharge plate are inserted into the conduits 2 on the other discharge plate.

[0013] Preferably, a limit stop bar is fixedly provided on the outer edge of the rake bar near the two discharge plates, the length of the two limit stop bars is parallel to the end of the rake bar, and the end of the limit stop bar is arc-shaped, and the end of the limit stop bar contacts the discharge plate.

[0014] Preferably, a guide bar is fixedly provided on the outer edge of the rake shaft, and a slot for engaging with the guide bar is provided on the inner edge of the discharge plate.

[0015] A preparation process of a low-viscosity polyanionic cellulose preparation device, characterized by:

[0016] Step 1: Add cellulose into a reaction tank and then dry it;

[0017] Step 2: After drying, the linear push mechanism pushes the multiple pull rods to move horizontally, and the hinged rod pulls the rake rod inward to retract. While the rake rod moves, the rake rod rotates along the rotating column through the inclined slot, so that the end of the rake rod rotates to be parallel to the axis of the rake shaft;

[0018] Step 3: Insert the linear actuator into the reaction tank, and use the linear actuator to push the discharge plate to slide horizontally, so as to push the cellulose out along the discharge port of the reaction tank;

[0019] Step 4: Pull out all the linear pushers, rotate the drive to drive the rake shaft to rotate, rotate the feed hole to the bottom of the rake shaft, insert the linear pusher, and attract the end of the linear pusher to the strong magnet, and then use the linear pusher to pull the discharge plate to reset;

[0020] Step 4: Rotate the drive again to rotate the harrow shaft so that the feeding hole is directly above the harrow shaft;

[0021] Step 5: Repeat steps 3 to 5 several times until all the cellulose in the reaction tank is pushed out.

[0022] The beneficial effects of the present invention are as follows: in the preparation device for low-viscosity polyanionic cellulose, the end of the rake rod can contact the inner wall of the reaction tank during drying, avoiding the phenomenon of sticking to the bottom. After drying is completed, the dried cellulose is discharged by being pushed through the discharge plate. Before the discharge plate is pushed, the linear pushing mechanism pushes, and the linear pushing mechanism will push multiple pull rods to move horizontally. The hinged rod will pull the rake rod inward to shrink, so that the edge of the discharge plate will not be penetrated, and the discharge plate can be pushed as a whole. At the same time as the rake rod moves, the rake rod will rotate along the rotating column through the inclined groove, so that the end of the rake rod rotates to be parallel to the axis of the rake shaft, avoiding the rake rod end being too long and causing the avoidance hole to be opened larger, reducing the residual amount when the fiber bundle is pushed for the first time, and facilitating the discharge of the dried cellulose. And by pushing the discharge plate in this way, the number of rake rods will not be limited, so that the length of the reaction tank can be freely controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0025] Figure 2 It is a cross-sectional view of the present invention.

[0026] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention without the reaction tank.

[0027] Figure 4 Schematic diagram of the connection between the rake rod and the rake shaft.

[0028] Figure 5 It is a partial cross-sectional view of the rake rod and rake shaft.

[0029] Figure 6 It is a schematic diagram of the three-dimensional structure of the inner pulling mechanism and the rotating mechanism.

[0030] Figure 7 It is a schematic diagram of the three-dimensional structure of the linear propulsion mechanism.

[0031] Figure 8 Schematic diagram of the three-dimensional structure of the guide sleeve.

[0032] Figure 9 This is a schematic diagram of the three-dimensional structure after the linear thruster is installed in the present invention.

[0033] Figure 10 Schematic diagram of the three-dimensional structure of the discharge plate.

[0034] Figure 11 It is a schematic diagram of the three-dimensional structure of the contact state between the discharge plate and the limit stop bar.

[0035] Figure 12 It is a schematic diagram of the local three-dimensional structure of the contact state between the discharge plate and the rake shaft.

[0036] Explanation of the accompanying drawings: 1. Reaction tank; 2. Rake rod; 2a. Insert column one; 3. Rake shaft; 4. Discharge plate; 4a. Avoidance hole; 4b. Feeding hole; 4c. Insert column two; 4d. Conduit two; 4e. Slot; 4f. Guide bar; 5. Linear pusher; 5a. Strong magnet; 6. Inner pulling mechanism; 6a. Pull rod; 6b. Guide sleeve; 6b1. Conduit one; 6c. Linear pushing mechanism; 6c1. Rotating shaft; 6c2. Connecting plate; 6c3. Electric push rod; 6d. Articulated rod; 6e. Rotating sleeve; 7. Rotating mechanism; 7a. Rotating column; 7b. Inclined groove; 8. Limiting bar. DETAILED DESCRIPTION

[0037] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0038] Example: The present invention provides a preparation device for low-viscosity polyanionic cellulose, such as Figure 1-3 As shown, it includes multiple rows of rake rods 2, rake shafts 3, two discharge plates 4 and a reaction tank 1 fixed on a mounting frame. Multiple rake rods 2 are fixedly mounted on the outer edge of the rake shaft 3, and the rake shaft 3 is rotatably mounted in the reaction tank 1. A rotary driver for driving the rake shaft 3 to rotate is fixedly provided on the outside of the reaction tank 1. The two discharge plates 4 are respectively located on both sides of the interior of the reaction tank 1. Each discharge plate 4 is provided with multiple avoidance holes 4a for horizontal passage of multiple rows of rake rods 2. A feeding hole 4b is provided between two adjacent avoidance holes 4a. The reaction tank 1 is provided with a linear pusher 5 for pushing the two discharge plates 4 inward. Low-viscosity polyanionic cellulose (hereinafter referred to as cellulose) is added to the reaction tank 1 and then dried. After drying, the cellulose needs to be discharged along the discharge port. The two discharge plates 4 are driven inward by the linear pusher 5, so that the two discharge plates 4 move horizontally. During the movement, the discharge plates 4 can avoid the rake rod 2 through the avoidance hole 4a, and the cellulose on the edge of the cellulose can be pushed to the middle, and the cellulose will be discharged along the discharge port in the middle of the reaction tank 1.

[0039] However, due to the effect of the avoidance hole 4a, when the cellulose is extruded, the cellulose hidden behind the rake rod 2 will not be squeezed out, resulting in residue. It should be explained that the cellulose behind the rake rod 2 will slide down along the inner edge of the reaction tank 1 to the bottom of the inner edge of the reaction tank 1. If the discharge plate 4 is directly pulled back to reset at this time, the cellulose will be carried away by the reset discharge plate 4. This means that even if the discharge plate 4 is pushed forward again, the cellulose cannot be squeezed out. In order to solve this problem, the reaction tank 1 is rotated so that the feed hole 4b originally located directly above the rake shaft 3 is rotated to directly below the rake shaft 3. When the discharge plate 4 is reset backward, it will avoid the cellulose located at the bottom of the inner edge of the reaction tank 1. When the discharge plate 4 is pushed forward again, the discharge plate 4 will remove the cellulose located at the bottom of the inner edge of the reaction tank 1.

[0040] Since the inner wall of the reaction tank 1 is mainly used for heating, the ends of the rake rods 2 need to contact the inner edge of the reaction tank 1, so that the fiber bundles in contact with the inner wall of the reaction tank 1 can be brought up. However, this requires the avoidance holes 4a to be penetrated, so that the discharge plate 4 is divided into multiple parts. In order to solve this problem, when discharging cellulose, multiple rake rods 2 need to be retracted inward to avoid the avoidance holes 4a from penetrating the discharge plate 4. At the same time, the length of the side of the rake rods 2 away from the rake shaft 3 needs to be lengthened as needed, and the ends of the rake rods 2 are inclined and not parallel to the axis of the rake shaft 3. Therefore, when discharging cellulose, the ends of the rake rods 2 need to be rotated to be parallel to the axis of the rake shaft 3 to avoid the width of the avoidance holes 4a being too large, resulting in a large amount of residual cellulose. For this reason, the rake shaft 3 is fixed with an inner pulling mechanism 6 that pulls multiple rows of rake rods 2 to move inward synchronously and a rotating mechanism 7 that drives the ends of multiple rows of rake rods 2 to rotate to be parallel to the axis of the rake shaft 3. The multiple rows of rake rods 2 are pulled inward by the inner pulling mechanism 6 to prevent the avoidance holes 4a from penetrating the discharge plate 4. At the same time, the multiple rows of rake rods 2 are driven to rotate by the rotating mechanism 7 so that the ends of the rake rods 2 are parallel to the axis of the rake shaft 3.

[0041] Due to the high temperature environment of the reaction tank 1 and the limited internal space of the rake shaft 3, it is difficult to install more structures on the inner pulling mechanism 6 and the rotating mechanism 7 to rotate and pull. Figure 5As shown, the inner pulling mechanism 6 includes a linear pushing mechanism 6c and multiple inner pulling units. The multiple inner pulling units correspond to two rake rods 2 respectively. Each inner pulling unit includes a pull rod 6a, a guide sleeve 6b, a linear pushing mechanism 6c, a hinge rod 6d and a rotating sleeve 6e. The guide sleeves 6b on the multiple inner pulling units are fixedly connected to each other. The guide sleeves 6b at the head and tail ends are fixedly connected to the rake shaft 3. When the rake shaft 3 rotates, the guide sleeves 6b will be driven to rotate together. The pull rods 6a on the multiple inner pulling units are fixedly connected to each other. The outer edge of the pull rod 6a fits the inner edge of the guide sleeve 6b. The pull rod 6a at the end is rotatably connected to the driving end of the linear pushing mechanism 6c. By pulling the linear pushing mechanism 6c, the linear pushing mechanism 6c can push the multiple pull rods 6a to slide along the inside of the linear pushing mechanism 6c. When the rake shaft 3 rotates, the pull rod 6a can be pulled to rotate at the same time. A guide tube 6b1 for sliding connection of the rake rod 2 is provided on the outer edge of the guide sleeve 6b, and an annular groove for inserting the guide tube 6b1 is provided at the bottom of the rake rod 2. A plug-in column 2a is formed between the rake rod 2 and the annular groove. The bottom of the plug-in column 2a is rotatably connected to the rotating sleeve 6e. One end of the hinged rod 6d is hinged to the rotating sleeve 6e, and the other end of the hinged rod 6d is hinged to the pull rod 6a. Figure 8 As shown, the junction between guide tube 1 (6b1) and guide sleeve (6b) features an escape slot for hinged rod (6d) to slide. When multiple rake rods (2) need to be retracted inward, linear push mechanism (6c) pushes guide sleeve (6b) inward. Movement of pull rod (6a) pulls hinged rod (6d), causing hinged rod (6d) to pull rotating sleeve (6e) downward. This retracts the rake rods (2) inward, eliminating the need for escape slot (4a) to penetrate discharge plate (4). This structure is simple, requires minimal temporary space, and requires no internal electrical components, making it adaptable to high-temperature environments.

[0042] like Figure 6 As shown, the rotating mechanism 7 includes a rotating column 7a and an inclined slot 7b. Two rotating columns 7a are fixedly provided on the outer edge of the conduit 1 6b1, and an inclined slot 7b is provided on the outer edge of the rake rod 2 for the rotating columns 7a to slide. When the rotating sleeve 6e is pulled inward, the rotating sleeve 6e will pull the rake rod 2 inward, and the rotating sleeve 6e is rotatably connected to the plug column 1 2a, so that the inclined slot 7b will slide along the limiting effect of the rotating column 7a, that is, drive the rake rod 2 to rotate. The end axis of the rake rod 2 can be parallel to the axis of the rake shaft 3. In addition, the structure is simple, takes up little space, can be installed in the rake shaft 3, and is driven by the inner pulling mechanism 6. It can rotate without the need for electrical components, avoiding damage in a high temperature environment. In addition, through this rotation method, the rotation angle is more precise, and the angles of multiple rake rods 2 can be the same.

[0043] like Figure 7As shown, the linear propulsion mechanism 6c includes a rotating shaft 6c1, a connecting plate 6c2, and two electric push rods 6c3. The two electric push rods 6c3 are fixedly mounted on the outer edge of the reaction tank 1. The connecting plate 6c2 is fixedly mounted on the ends of the two electric push rods 6c3. One end of the rotating shaft 6c1 is rotatably connected to the connecting plate 6c2. By controlling the electric push rods 6c3 to operate, the electric push rods 6c3 will pull the connecting plate 6c2 to move horizontally, and the connecting plate 6c2 will pull the rotating shaft 6c1 to move, thereby driving multiple pull rods 6a to be pulled simultaneously. Specifically, when the rake bar 2 rotates, it will also drive the pull rods 6a to rotate, and the pull rods 6a will be able to rotate relative to the connecting plate 6c2 via the rotating shaft 6c1.

[0044] In order to be able to push and pull the discharge plate 4, as Figure 9 As shown, the linear actuator 5 includes two rows of push rods. The reactor 1 is provided with guide holes for the push rods to pass through. Before the discharge plate 4 is pushed, the discharge plate 4 tightly covers the guide holes, preventing air from entering the reactor 1 through the guide holes. However, the linear actuator 5 can only push the discharge plate 4 inward, but cannot pull it back. To this end, a strong magnet 5a is fixedly installed in the area where the discharge plate 4 contacts the push rods. Even after the discharge plate 4 rotates 180 degrees, the strong magnet 5a remains in this horizontal position. When the discharge plate 4 needs to be reset and pulled back, the linear actuator 5 and the strong magnet 5a are tightly attracted to each other, and then the linear actuator 5 is pulled back, which can drive the discharge plate 4 to be pulled back.

[0045] In order to make the rake bar 2 drive the discharge plate 4 to rotate when rotating, for this purpose, Figure 3 As shown, each discharge plate 4 is fixedly provided with two plugs 4c and two conduits 4d. The outer edges of the two conduits 4d are clamped to the outer edges of one or more rake rods 2. The plugs 4c on one discharge plate 4 are inserted into the conduits 4d on another discharge plate 4. When the rake rods 2 rotate, the rake rods 2 push the conduits 4d, which in turn drives the discharge plate 4 to rotate, allowing the feed holes 4b to rotate and switch positions. Furthermore, during rotation, the conduits 4d and plugs 4c agitate the cellulose, ensuring a more uniform agitation.

[0046] When the linear pusher 5 is fully pulled out, if the discharge plate 4 has no obstruction, it will slide along the axial direction of the rake shaft 3, causing the equipment to malfunction. However, after the linear push mechanism 6c is pulled, the discharge plate 4 needs to slide again. For this purpose, Figure 7 and Figure 11As shown, a limit stop bar 8 is fixedly installed on the outer edge of the rake rod 2 near the two discharge plates 4. The length of the two limit stop bars 8 is parallel to the end of the rake rod 2, and the end of the limit stop bar 8 is arc-shaped, and the end of the limit stop bar 8 contacts the discharge plate 4. When the rake rod 2 is in the initial tilted state, the limit stop bar 8 can resist and lock the discharge plate 4, so that the discharge plate 4 cannot slide. After the rake rod 2 rotates, the rake rod 2 will drive the limit stop bar 8 to rotate, and the limit stop bar 8 is parallel to the end of the rake rod 2. This allows the avoidance hole 4a to pass through the limit stop bar 8 without obstruction. In addition, the end of the limit stop bar 8 is arc-shaped, so when the limit stop bar 8 rotates with the rake rod 2, there will be no rigid collision between the limit stop bar 8 and the discharge plate 4.

[0047] like Figure 12 As shown, a guide bar 4f is fixedly provided on the outer edge of the rake shaft 3, and a draw-in slot 4e that is engaged with the guide bar 4f is provided on the inner edge of the discharge plate 4. Through the effect of the guide bar 4f and the draw-in slot 4e, the sliding of the discharge plate 4 can be smoother.

[0048] A preparation process of a low-viscosity polyanionic cellulose preparation device, characterized by:

[0049] Step 1: Add cellulose into the reaction tank 1 and then dry it;

[0050] Step 2: After drying, the linear pushing mechanism 6c pushes the multiple pull rods 6a to move horizontally, and the hinged rod 6d pulls the rake rod 2 inward. While the rake rod 2 moves, the rake rod 2 rotates along the rotating column 7a through the inclined slot 7b, so that the end of the rake rod 2 rotates to be parallel to the axis of the rake shaft 3;

[0051] Step 3: Insert the linear pusher 5 into the reaction tank 1, and use the linear pusher 5 to push the discharge plate 4 to slide horizontally, so as to push the cellulose out along the discharge port of the reaction tank 1;

[0052] Step 4: The linear pusher 5 is completely pulled out, the rotary driver drives the rake shaft 3 to rotate 180 degrees, the feeding hole 4b is rotated to the bottom of the rake shaft 3, the linear pusher 5 is inserted, and the end of the linear pusher 5 is attracted to the strong magnet 5a, and then the discharge plate 4 is pulled back to its original position by the linear pusher 5;

[0053] Step 4: The rotary driver drives the harrow shaft 3 to rotate 180 degrees again, so that the feeding hole 4b is located directly above the harrow shaft 3;

[0054] Step 5: Repeat steps 3 to 5 multiple times until all the cellulose in the reaction tank 1 is ejected.

[0055] The preparation device of low-viscosity polyanionic cellulose is such that, during drying, the end of the rake rod 2 can contact the inner wall of the reaction tank to avoid the phenomenon of sticking to the bottom. After drying is completed, the dried cellulose is discharged by being pushed through the discharge plate 4. Before the discharge plate 4 is pushed, the linear pushing mechanism 6c is pushed, and the linear pushing mechanism 6c will push the multiple pull rods 6a to move horizontally, and the hinged rod 6d will pull the rake rod 2 inward to shrink, so that the edge of the discharge plate will not be penetrated, and the discharge plate 4 can be pushed as a whole. At the same time as the rake rod 2 moves, the rake rod 2 will rotate along the rotating column 7a through the inclined groove 7b, so that the end of the rake rod 2 rotates to be parallel to the axis of the rake shaft 3, avoiding the end of the rake rod 2 being too long and causing the avoidance hole 4a to be opened larger, reducing the residual amount when the fiber bundle is pushed for the first time, and facilitating the discharge of the dried cellulose. And by pushing the discharge plate 4 in this way, the number of rake rods 2 will not be limited, so that the length of the reaction tank 1 can be freely controlled.

[0056] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A preparation device for low-viscosity polyanionic cellulose, characterized in that: The invention comprises a plurality of rows of rake rods (2), a rake shaft (3), two discharge plates (4) and a reaction tank (1) fixedly mounted on a frame, wherein the plurality of rake rods (2) are fixedly mounted on the outer edge of the rake shaft (3), the rake shaft (3) is rotatably mounted in the reaction tank (1), a rotary driver for driving the rake shaft (3) to rotate is fixedly arranged on the outer side of the reaction tank (1), the two discharge plates (4) are respectively located on both sides of the interior of the reaction tank (1), each discharge plate (4) is provided with a plurality of avoidance holes (4a) for allowing the plurality of rows of rake rods (2) to pass horizontally, a passing hole (4b) is provided between two adjacent avoidance holes (4a), and a linear pusher (5) is provided on the reaction tank (1) for pushing the two discharge plates (4) to move inward; An inner pulling mechanism (6) for pulling the multiple rows of rake rods (2) to move inward synchronously and a rotating mechanism (7) for driving the ends of the multiple rows of rake rods (2) to rotate parallel to the axis of the rake shaft (3) are fixedly arranged inside the rake shaft (3); The inner pulling mechanism (6) includes a linear pushing mechanism (6c) and a plurality of inner pulling units, wherein the plurality of inner pulling units correspond to two rake rods (2) respectively, and each inner pulling unit includes a pull rod (6a), a guide sleeve (6b), a linear pushing mechanism (6c), a hinge rod (6d) and a rotating sleeve (6e). The guide sleeves (6b) on the plurality of inner pulling units are fixedly connected to each other, and the guide sleeves (6b) at the head and tail ends are fixedly connected to the rake shaft (3). The pull rods (6a) on the plurality of inner pulling units are fixedly connected to each other, and the outer edges of the pull rods (6a) fit with the inner edges of the guide sleeves (6b). The pull rods (6a) at the ends are fixedly connected to the linear pushing mechanism (6c). The driving end of the driving mechanism (6c) is rotatably connected, a guide tube (6b1) for sliding connection of the rake rod (2) is provided on the outer edge of the guide sleeve (6b), an annular groove for inserting the guide tube (6b1) is provided at the bottom of the rake rod (2), an insertion column (2a) is formed between the rake rod (2) and the annular groove, the bottom of the insertion column (2a) is rotatably connected to the rotating sleeve (6e), one end of the hinged rod (6d) is hinged to the rotating sleeve (6e), and the other end of the hinged rod (6d) is hinged to the pull rod (6a), and an avoidance groove for sliding of the hinged rod (6d) is provided at the connection between the guide tube (6b1) and the guide sleeve (6b).

2. The device for preparing low-viscosity polyanionic cellulose according to claim 1, wherein: The rotating mechanism (7) comprises a rotating column (7a) and an inclined groove (7b). Two rotating columns (7a) are fixedly provided on the outer edge of the conduit 1 (6b1), and an inclined groove (7b) for the rotating columns (7a) to slide is provided on the outer edge of the rake rod (2).

3. The device for preparing low-viscosity polyanionic cellulose according to claim 2, wherein: The linear propulsion mechanism (6c) comprises a rotating shaft (6c1), a connecting plate (6c2), and two electric push rods (6c3). The two electric push rods (6c3) are fixedly mounted on the outer edge of the reaction tank (1). The connecting plate (6c2) is fixedly mounted on the ends of the two electric push rods (6c3). One end of the rotating shaft (6c1) is rotatably connected to the connecting plate (6c2).

4. The device for preparing low-viscosity polyanionic cellulose according to claim 3, wherein: The linear pusher (5) includes two rows of push rods. A guide hole for the push rods to pass through is provided on the reaction tank (1). Before the discharge plate (4) is pushed, the discharge plate (4) covers the guide hole. A strong magnet (5a) is fixedly provided in the area where the discharge plate (4) contacts the push rods.

5. The device for preparing low-viscosity polyanionic cellulose according to claim 4, wherein: Two plug-in posts (4c) and two conduits (4d) are fixedly provided on each discharge plate (4), and the outer edges of the two conduits (4d) are clamped on the outer edges of one or more rake rods (2), and the plug-in posts (4c) on one discharge plate (4) are inserted into the conduits (4d) on the other discharge plate (4).

6. The device for preparing low-viscosity polyanionic cellulose according to claim 4, wherein: A limit stop bar (8) is fixedly provided on the outer edge of the rake rod (2) near the two discharge plates (4), the lengths of the two limit stop bars (8) are parallel to the ends of the rake rod (2), and the ends of the limit stop bars (8) are arc-shaped, and the ends of the limit stop bars (8) are in contact with the discharge plates (4).

7. The device for preparing low-viscosity polyanionic cellulose according to claim 4, characterized in that: A guide bar (4f) is fixedly provided on the outer edge of the rake shaft (3), and a clamping groove (4e) is provided on the inner edge of the discharge plate (4) for clamping with the guide bar (4f).

8. The process for preparing a low-viscosity polyanionic cellulose preparation device according to claim 4, wherein: Step 1: adding cellulose into a reaction tank (1) and then drying; Step 2: After drying, the linear propulsion mechanism (6c) pushes, and the linear propulsion mechanism (6c) pushes the plurality of pull rods (6a) to move horizontally, and the hinged rod (6d) pulls the rake rod (2) to retract inward. While the rake rod (2) moves, the rake rod (2) rotates along the rotating column (7a) through the inclined slot (7b), so that the end of the rake rod (2) rotates to be parallel to the axis of the rake shaft (3); Step 3: inserting the linear pusher (5) into the reaction tank (1), and pushing the discharge plate (4) to slide horizontally by the linear pusher (5), so as to push the cellulose out along the discharge port of the reaction tank (1); Step 4: The linear pusher (5) is completely pulled out, the rotary driver drives the rake shaft (3) to rotate 180 degrees, the feed hole (4b) is rotated to the position directly below the rake shaft (3), the linear pusher (5) is inserted, and the end of the linear pusher (5) is attracted to the strong magnet (5a), and then the discharge plate (4) is pulled back to its original position by the linear pusher (5); Step 4: The rotary driver drives the rake shaft (3) to rotate 180 degrees again, so that the feeding hole (4b) is located directly above the rake shaft (3); Step 5: Repeat steps 3 to 5 several times until all the cellulose in the reaction tank (1) is pushed out.

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