Screening device in production process of sodium carboxymethyl cellulose

Abstract

The invention discloses a screening device in the sodium carboxymethyl cellulose production process, and relates to the technical field of screening devices.The screening device comprises a bin cover, a screening bin, a feeding pipe, a screening plate, a fixing sleeve, a motor, a rotating shaft, a mounting base and a rotating shaft, the two ends of the rotating shaft are coaxially sleeved with grinding rollers respectively, and the peripheries of the grinding rollers make rolling contact with the upper surface of the screening plate; the end gear is coaxially connected to the lower end of the fixing sleeve in a sleeving mode, the rotating shaft is sleeved with two gears, the two gears are symmetrically arranged in the axial direction of the fixing sleeve, and the end gear and the two gears are in a meshed state. By arranging the fixing sleeve, the end gear and the gears, when the rotating shaft rotates and drives the two grinding rollers to rotate around the axial direction of the rotating shaft, the end gear is meshed with the two gears, and then the gears are driven to rotate, so that the two grinding rollers synchronously rotate around the axial directions of the grinding rollers; and the sodium carboxymethyl cellulose powder on the screening plate can be ground, and the grinding efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of screening devices, in particular to a screening device used in the production process of sodium carboxymethyl cellulose. Background Art

[0002] Sodium carboxymethyl cellulose aqueous solution is viscous and has good adhesion. Because of its many special properties, such as thickening, bonding, film formation, water retention, emulsification, suspension, etc., and its own non-toxic, odorless, non-fermentable, good thermal stability, etc., it is widely used in petroleum geology, daily chemicals, food, medicine and other industries, and is known as "industrial MSG". Sodium carboxymethyl cellulose is in powder state when it is made. During the production process of sodium carboxymethyl cellulose, sodium carboxymethyl cellulose will absorb water and then form balls, so it needs to be filtered.

[0003] Prior art Chinese patent publication number CN214288498U discloses a sodium carboxymethyl cellulose screening device. In this technical solution, the sodium carboxymethyl cellulose powder accumulated on the screening plate is ground and screened by a grinding roller. However, since the grinding roller does not rotate actively, when the amount of sodium carboxymethyl cellulose powder accumulated on the screening plate is large, the grinding roller is blocked by the sodium carboxymethyl cellulose powder and cannot rotate. When the grinding roller rotates around the axial direction of the rotating rod, the grinding roller itself cannot rotate, so that the sodium carboxymethyl cellulose powder on the screening plate is driven by the grinding roller and moves on the screening plate, that is, the grinding roller cannot grind the sodium carboxymethyl cellulose powder, which leads to an unsatisfactory grinding effect of the grinding roller on the sodium carboxymethyl cellulose powder. Summary of the invention

[0004] The object of the present invention is to provide a screening device in the production process of sodium carboxymethyl cellulose to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A screening device in the production process of sodium carboxymethyl cellulose, comprising a screening bin with an open top and connected to a bin cover, wherein a feeding pipe is provided on the top surface of the bin cover, and further comprising: A screening plate fixedly connected to the inner wall of the screening bin; A fixing sleeve coaxially connected to the bottom of the bin cover; A motor is installed on the top of the bin cover, wherein the output shaft of the motor is drivingly connected to a rotating shaft, the rotating shaft is coaxially arranged in the fixing sleeve, and the rotating shaft rotates freely in the fixing sleeve; A mounting seat fixedly connected to one end of the rotating shaft passing through the fixed sleeve, the rotating shaft being passed through the mounting seat in a horizontally rotatable manner, grinding rollers being coaxially sleeved at both ends of the rotating shaft, and the periphery of the grinding rollers being in rolling contact with the upper surface of the sieve plate; An end gear is coaxially sleeved on the lower end of the fixing sleeve, and two gears are sleeved on the rotating shaft. The two gears are symmetrically arranged along the axial direction of the fixing sleeve, and the end gear is in meshing state with the two gears.

[0006] Furthermore, the surface of the grinding roller is provided with a chrome plating layer.

[0007] Furthermore, a discharge port is provided at the bottom of the screening bin.

[0008] Furthermore, two mounting arms are symmetrically fixedly connected to the bottom of the screen plate along the axial direction of the rotating shaft, the lower end of the mounting arm is rotatably connected to a floating arm, one end of the floating arm is fixedly connected to a vibration arm, and a knocking assembly is provided at the bottom of the screen plate. The knocking assembly is used to drive the floating arm to swing up and down at the rotating fulcrum with the mounting arm when the rotating shaft rotates.

[0009] Furthermore, the knocking assembly includes a spring whose two ends are respectively fixed to the bottom surface of the screen plate and the upper surface of the floating arm, the spring is in a vertical state, the lower end of the rotating shaft penetrates the screen plate and rotates freely, the lower end of the rotating shaft is coaxially fixed with a rotating part, the upper end surface of the rotating part is fixed with a plurality of arc-shaped protrusions along its axial array, and the end of the other end of the floating arm is used in conjunction with the arc-shaped protrusion.

[0010] Furthermore, one end of the floating arm away from the vibration arm is rotatably connected to a roller, and the roller alternately rolls and contacts the upper end surface of the rotating part and the arc-shaped protrusion.

[0011] Furthermore, a baffle is horizontally slidably connected to the bottom of the bin cover, and a connecting port consistent with the inner diameter of the feeding pipe is opened on the outer wall of the baffle. A driving assembly is provided at the bottom of the bin cover, and the driving assembly is used to drive the baffle to move when the rotating shaft rotates, so that the connecting port and the mouth of the feeding pipe are connected.

[0012] Furthermore, two strip blocks are fixedly connected to the bottom of the bin cover, the baffle is engaged between the two strip blocks, protrusions are fixedly connected to the outer walls on both sides of the baffle, and the outer walls of the strip blocks are provided with grooves for the protrusions to engage, and the protrusions slide freely in the grooves.

[0013] Furthermore, the driving assembly includes a connecting arm fixedly connected to the lower surface of the baffle, a driving rod is horizontally fixedly connected to the lower end of the connecting arm, a fixed bin is coaxially fixedly connected to the outer wall of the upper end of the fixing sleeve, the interior of the fixed bin is hollow, a cam block is sleeved on the periphery of the rotating shaft, the cam block rotates freely in the fixed bin, one end of the driving rod away from the connecting arm is penetrated through the fixed bin and slides freely horizontally on the fixed bin, the end of the driving rod penetrated into the fixed bin is rotatably embedded with a ball, the ball rolls and contacts with the outer edge of the cam block, and a reset unit is provided on the baffle.

[0014] Furthermore, the reset unit includes an ear block fixed to the bottom surface of the bin cover, a sliding rod is horizontally penetrated through the ear block, the sliding rod slides freely horizontally on the ear block, one end of the sliding rod is fixed to the side wall of the baffle, and the other end is sleeved with a limiting ring, a reset spring is sleeved around the sliding rod, and the two ends of the reset spring in the direction of elastic force are respectively fixed to the end face of the limiting ring and the outer wall of the ear block.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention sets a fixed sleeve, an end gear and a gear. When the rotating shaft rotates and drives the two grinding rollers to rotate around the axial direction of the rotating shaft, the end gear will mesh with the two gears, thereby driving the gears to rotate, so that the two grinding rollers rotate synchronously around their own axial directions. Compared with the prior art, since the grinding rollers can actively rotate, the sodium carboxymethyl cellulose powder on the sieve plate can be ground, thereby improving the grinding efficiency; 2. When the rotating shaft rotates, the roller rolls alternately on the rotating part and the arc-shaped protrusion, and cooperates with the elastic abutment of the spring on the floating arm, so that the vibration arm can knock on the bottom of the screening plate, accelerate the penetration of sodium carboxymethyl cellulose powder from the screening plate, prevent the sodium carboxymethyl cellulose powder from accumulating on the top of the screening plate and generating resistance to the rolling of the grinding roller, and at the same time avoid the sodium carboxymethyl cellulose powder accumulating too much on the top of the screening plate, so that the grinding roller drives away the sodium carboxymethyl cellulose powder; 3. When the rotating shaft of the present invention rotates, the baffle is driven to reciprocate horizontally, so that the connecting port on the baffle coincides with the mouth of the feeding pipe, so that the sodium carboxymethyl cellulose powder can be fed into the screening bin from the feeding pipe, and then the sodium carboxymethyl cellulose powder can be intermittently fed into the screening bin, thereby avoiding excessive accumulation of sodium carboxymethyl cellulose powder on the screening plate, which affects the grinding of the sodium carboxymethyl cellulose powder on the screening plate by the grinding roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a screening device in the production process of sodium carboxymethyl cellulose in the present invention; Figure 2for Figure 1 A schematic cross-sectional view of the structure; Figure 3 This is a schematic diagram of the structure after the screening bin is omitted in the present invention; Figure 4 for Figure 3 A schematic diagram of the structure from a front view angle; Figure 5 for Figure 3 Schematic diagram of the structure at an upward viewing angle; Figure 6 for Figure 5 A magnified schematic diagram of the local structure at point A; Figure 7 for Figure 5 A schematic cross-sectional structure diagram of; Figure 8 for Figure 7 An enlarged schematic diagram of the local structure at point B.

[0017] In the figure, the description of each figure mark is as follows: 1. Motor; 2. Bin cover; 3. Feeding pipe; 4. Screening bin; 5. Discharge port; 6. Baffle; 7. End gear; 8. Mounting seat; 9. Screening plate; 10. Fixed bin; 11. Fixed sleeve; 12. Grinding roller; 13. Gear; 14. Sliding rod; 15. Bar block; 16. Connecting port; 17. Connecting arm; 18. Driving rod; 19. Vibrating arm; 20. Floating arm; 21. Spring; 22. Rotating part; 23. Rotating shaft; 24. Mounting arm; 25. Reset spring; 26. Ear block; 27. Protrusion; 28. Limiting ring; 29. ​​Cam block; 30. Roller; 31. Arc protrusion. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in 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.

[0019] See also Figure 1-Figure 8The present invention provides a technical solution: a screening device in the production process of sodium carboxymethyl cellulose, comprising a screening bin 4 with an open top and connected to a bin cover 2, a plurality of legs are welded to the bottom of the screening bin 4, and a discharge port 5 is also opened at the bottom, a feeding pipe 3 is arranged on the top surface of the bin cover 2, and an external conveying device conveys the sodium carboxymethyl cellulose powder from the feeding pipe 3 to the screening bin 4, the screening bin 4 is welded to the inner wall of the screening bin 4, a hollow fixing sleeve 11 is coaxially connected to the bottom of the bin cover 2, and the top of the bin cover 2 is vertically A motor 1 is installed, and the output shaft of the motor 1 is connected to a rotating shaft 23, which is coaxially inserted into the fixed sleeve 11 and rotates freely in the fixed sleeve 11. One end of the rotating shaft 23 passing through the fixed sleeve 11 is fixedly connected to a mounting seat 8, and a rotating shaft is inserted horizontally and rotatably on the mounting seat 8. Grinding rollers 12 are coaxially sleeved at both ends of the rotating shaft, and the periphery of the grinding roller 12 is in rolling contact with the upper surface of the screening plate 9. The lower end of the fixed sleeve 11 is coaxially and fixedly sleeved with an end gear 7, and two gears are sleeved on the rotating shaft. 13, the two gears 13 are symmetrically arranged along the axial direction of the fixed sleeve 11, and the end gear 7 is in meshing state with the two gears 13. After the conveying equipment conveys the sodium carboxymethyl cellulose powder from the feeding pipe 3 to the screening bin 4, it will be accumulated on the screening plate 9. The powder with a smaller volume will pass through the screening plate 9 and fall into the inside of the screening bin 4, and fall into the external collecting device from the discharge port 5. The motor 1 starts and drives the rotating shaft 23 to rotate. The rotating shaft 23 drives the mounting seat 8 to rotate, so that the rotating shaft drives the two grinding rollers 12 to rotate around the axial direction of the rotating shaft 23. In this process, the end gear 7 is meshed with the two gears 13 together, and then the driving gear 13 is rotated. When the gear 13 rotates, the driving shaft is rotated, and then the two grinding rollers 12 are driven to rotate, so that the grinding roller 12 rolls and grinds the sodium carboxymethyl cellulose powder on the top of the screening plate 9. In addition, the surface of the grinding roller 12 is provided with a chrome-plated layer, so that the surface of the grinding roller 12 is relatively smooth, and the sodium carboxymethyl cellulose powder is not easy to adhere to the periphery of the grinding roller 12; Two mounting arms 24 are symmetrically fixed along the axial direction of the rotating shaft 23 at the bottom of the screening plate 9. The lower end of the mounting arm 24 is rotatably connected to a floating arm 20. One end of the floating arm 20 is fixed to a vibration arm 19. A spring 21 is fixedly connected to the bottom surface of the screening plate 9 and the upper surface of the floating arm 20, and the spring 21 is in a vertical state. The lower end of the rotating shaft 23 penetrates the screening plate 9 and rotates freely. A rotating part 22 is coaxially fixed to the lower end of the rotating shaft 23. A plurality of arc-shaped protrusions 31 are fixed to the upper end surface of the rotating part 22 along its axial array. The end of the floating arm 20 away from the vibration arm 19 is rotatably connected to a roller 30. The roller 30 rolls and contacts the upper end surface of the rotating part 22 and the arc-shaped protrusion 31 alternately. One end of the arc-shaped protrusion 31 is provided with an inclined surface. The rotating shaft 23 rotates When rotating, the roller 30 will alternately roll from the upper end surface of the rotating part 22 to the inclined surface of the arc-shaped protrusion 31, and roll vertically along the inclined surface to the upper surface of the arc-shaped protrusion 31, thereby driving the floating arm 20 to swing upward, causing the vibration arm 19 to swing downward, and at the same time causing the floating arm 20 to compress the spring 21, and the spring 21 accumulates elastic potential energy. As the rotating shaft 23 continues to rotate, the roller 30 rolls from the arc-shaped protrusion 31 to the upper end surface of the rotating part 22, and the elastic potential energy accumulated in the spring 21 will be released, and drive the floating arm 20 to swing rapidly in the opposite direction, thereby causing the vibration arm 19 to swing rapidly upward and knock on the bottom of the screening bin 4, so that the sodium carboxymethyl cellulose powder accumulated on the top of the screening bin 4 will quickly pass through the screening plate 9 under the action of the vibration force; The bottom of the bin cover 2 is horizontally slidably connected with a baffle 6. Specifically, two strip blocks 15 are fixedly connected to the bottom of the bin cover 2. The baffle 6 is engaged between the two strip blocks 15. The outer walls of both sides of the baffle 6 are fixedly connected with protrusions 27. The outer walls of the strip blocks 15 are provided with slots for the protrusions 27 to engage. The protrusions 27 slide freely in the slots. The sliding of the protrusions 27 in the slots makes the baffle 6 horizontally slidably connected to the bottom of the baffle 6. The outer wall of the baffle 6 is provided with a connecting port 16 that is consistent with the inner diameter of the feeding pipe 3. The lower surface of the baffle 6 is fixedly connected with a connecting arm 17. The lower end of the connecting arm 17 is horizontally fixedly connected with a driving rod 18. The upper outer wall of the fixed sleeve 11 is coaxially fixedly connected with a fixed bin 10. The inside of the fixed bin 10 The cam block 29 is hollow, and the periphery of the rotating shaft 23 is sleeved with a cam block 29, which rotates freely in the fixed bin 10. The end of the driving rod 18 away from the connecting arm 17 is penetrated on the fixed bin 10 and slides freely horizontally on the fixed bin 10. The end of the driving rod 18 that penetrates into the fixed bin 10 is rotatably embedded with a ball (not shown in the figure), and the ball rolls and contacts the outer edge of the cam block 29. The bottom surface of the bin cover 2 is fixedly connected with an ear block 26, and the ear block 26 is horizontally penetrated with a sliding rod 14. The sliding rod 14 slides freely horizontally on the ear block 26. One end of the sliding rod 14 is fixed to the side wall of the baffle 6, and the other end thereof is sleeved with a limiting ring 28. A return spring 25 is sleeved around the sliding rod 14, and the return spring 25 The two ends in the direction of the elastic force are respectively fixed to the end face of the limit ring 28 and the outer wall of the ear block 26. During the rotation of the rotating shaft 23, the cam block 29 is driven to rotate. Since the return spring 25 has an elastic resisting force on the limit ring 28, the sliding rod 14 moves in the direction of the rotating shaft 23, and the ball rolls on the periphery of the cam block 29. When the ball moves toward the farthest end of the periphery of the cam block 29 from the axial direction of the rotating shaft 23, the ball will be pushed toward the outside of the rotating shaft 23, thereby driving the driving rod 18 and the sliding rod 14 to move synchronously, so that the baffle 6 moves in the direction away from the fixed bin 10, so that the connecting port 16 of the baffle 6 can coincide with the mouth of the feeding pipe 3, and enter This allows the sodium carboxymethyl cellulose powder to enter the screening bin 4 from the connecting port 16, thereby achieving intermittent feeding of the sodium carboxymethyl cellulose powder. During this process, the return spring 25 is compressed by the limit ring 28 to accumulate elastic potential energy. When the ball moves from the farthest end of the circumference of the cam block 29 from the axial direction of the rotating shaft 23 toward the rotating shaft 23, the elastic potential energy of the return spring 25 is released, thereby causing the driving rod 18 to move in the direction of the rotating shaft 23, thereby causing the baffle 6 to move in the opposite direction, and causing the overlapping state of the connecting port 16 and the mouth of the feeding pipe 3 to disappear. The baffle 6 will block the mouth of the feeding pipe 3 to prevent the sodium carboxymethyl cellulose powder from continuing to be fed into the screening bin 4.

[0020] The working principle of the present invention is as follows: after the conveying equipment conveys the sodium carboxymethyl cellulose powder from the feeding pipe 3 to the screening bin 4, it will be accumulated on the screening plate 9, and the powder with a smaller volume will pass through the screening plate 9 and fall into the inside of the screening bin 4, and fall into the external collecting device from the discharge port 5, the motor 1 starts and drives the rotating shaft 23 to rotate, the rotating shaft 23 drives the mounting seat 8 to rotate, so that the rotating shaft drives the two grinding rollers 12 to rotate around the axial direction of the rotating shaft 23, in this process, the end gear 7 is meshed with the two gears 13, and then the driving gear 13 is rotated, when the gear 13 rotates, the driving shaft is rotated, and then the two grinding rollers 12 are driven to rotate, so that the grinding rollers 12 roll and grind the sodium carboxymethyl cellulose powder on the top of the screening plate 9; When the rotating shaft 23 rotates, the roller 30 will alternately roll from the upper end surface of the rotating part 22 to the inclined surface of the arc-shaped protrusion 31, and then roll vertically along the inclined surface to the upper surface of the arc-shaped protrusion 31, thereby driving the floating arm 20 to swing upward, causing the vibration arm 19 to swing downward, and at the same time causing the floating arm 20 to compress the spring 21, and the spring 21 accumulates elastic potential energy. As the rotating shaft 23 continues to rotate, the roller 30 rolls from the arc-shaped protrusion 31 to the upper end surface of the rotating part 22, and the elastic potential energy accumulated in the spring 21 will be released, and drive the floating arm 20 to swing rapidly in the opposite direction, thereby causing the vibration arm 19 to swing upward rapidly and knock on the bottom of the screening bin 4, so that the sodium carboxymethyl cellulose powder accumulated on the top of the screening bin 4 will quickly pass through the screening plate 9 under the action of the vibration force; In addition, during the rotation of the rotating shaft 23, the cam block 29 is driven to rotate. Since the return spring 25 has an elastic resisting force on the limit ring 28, the sliding rod 14 moves toward the direction of the rotating shaft 23, and the ball rolls on the periphery of the cam block 29. When the ball moves toward the farthest end of the periphery of the cam block 29 from the axial direction of the rotating shaft 23, the ball will be pushed toward the outside of the rotating shaft 23, thereby driving the driving rod 18 and the sliding rod 14 to move synchronously, so that the baffle 6 moves in the direction away from the fixed bin 10, so that the connecting port 16 of the baffle 6 can coincide with the mouth of the feeding pipe 3, thereby allowing the sodium carboxymethyl cellulose powder to The powder enters the screening bin 4 from the connecting port 16, thereby realizing intermittent feeding of the sodium carboxymethyl cellulose powder. During this process, the return spring 25 is compressed by the limit ring 28 to accumulate elastic potential energy. When the ball moves from the farthest end of the circumference of the cam block 29 from the axial direction of the rotating shaft 23 toward the rotating shaft 23, the elastic potential energy of the return spring 25 is released, thereby causing the driving rod 18 to move in the direction of the rotating shaft 23, thereby causing the baffle 6 to move in the opposite direction, and causing the overlapping state of the connecting port 16 and the mouth of the feeding pipe 3 to disappear. The baffle 6 will block the mouth of the feeding pipe 3 to prevent the sodium carboxymethyl cellulose powder from continuing to be fed into the screening bin 4.

[0021] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A screening device in the production process of sodium carboxymethyl cellulose, comprising a screening bin (4) with an open top and connected to a bin cover (2), wherein a feeding pipe (3) is provided on the top surface of the bin cover (2), characterized in that: Also includes: A screening plate (9) fixedly connected to the inner wall of the screening bin (4); A fixing sleeve (11) coaxially connected to the bottom of the bin cover (2); A motor (1) is mounted on the top of the bin cover (2), wherein the output shaft of the motor (1) is drivingly connected to a rotating shaft (23), the rotating shaft (23) is coaxially inserted into the fixing sleeve (11), and the rotating shaft (23) is freely rotatable in the fixing sleeve (11); A mounting seat (8) fixedly connected to one end of the rotating shaft (23) passing through the fixed sleeve (11), the mounting seat (8) being provided with a rotating shaft passing through the rotating shaft in a horizontally rotatable manner, grinding rollers (12) being coaxially sleeved at both ends of the rotating shaft, the peripheral edge of the grinding roller (12) being in rolling contact with the upper surface of the sieve plate (9); An end gear (7) is coaxially sleeved on the lower end of the fixed sleeve (11), and two gears (13) are sleeved on the rotating shaft. The two gears (13) are symmetrically arranged along the axial direction of the fixed sleeve (11), and the end gear (7) is in a meshing state with the two gears (13).

2. The screening device in the production process of sodium carboxymethyl cellulose according to claim 1, characterized in that: The surface of the grinding roller (12) is provided with a chrome plating layer.

3. The screening device in the production process of sodium carboxymethyl cellulose according to claim 1, characterized in that: The bottom of the screening bin (4) is provided with a discharge port (5).

4. The screening device in the production process of sodium carboxymethyl cellulose according to claim 1, characterized in that: Two mounting arms (24) are symmetrically fixedly connected to the bottom of the screening plate (9) along the axis of the rotating shaft (23); the lower ends of the mounting arms (24) are rotatably connected to floating arms (20); one end of the floating arm (20) is fixedly connected to a vibration arm (19); a knocking assembly is provided at the bottom of the screening plate (9); the knocking assembly is used to drive the floating arm (20) to swing up and down along the rotating fulcrum with the mounting arm (24) when the rotating shaft (23) rotates.

5. The screening device in the production process of sodium carboxymethyl cellulose according to claim 4, characterized in that: The knocking assembly comprises a spring (21) whose two ends are respectively fixed to the bottom surface of the screen plate (9) and the upper surface of the floating arm (20), the spring (21) is in a vertical state, the lower end of the rotating shaft (23) penetrates the screen plate (9) and rotates freely, the lower end of the rotating shaft (23) is coaxially fixed with a rotating part (22), the upper end surface of the rotating part (22) is fixed with a plurality of arc-shaped protrusions (31) along its axial array, and the end of the other end of the floating arm (20) is used in conjunction with the arc-shaped protrusion (31).

6. The screening device in the production process of sodium carboxymethyl cellulose according to claim 5, characterized in that: One end of the floating arm (20) away from the vibration arm (19) is rotatably connected to a roller (30), and the roller (30) alternately rolls in contact with the upper end surface of the rotating portion (22) and the arc-shaped protrusion (31).

7. The screening device in the production process of sodium carboxymethyl cellulose according to claim 1, characterized in that: A baffle (6) is horizontally slidably connected to the bottom of the bin cover (2); a communication port (16) having the same inner diameter as the feeding pipe (3) is formed on the outer wall of the baffle (6); a driving assembly is provided at the bottom of the bin cover (2); the driving assembly is used to drive the baffle (6) to move when the rotating shaft (23) rotates, so that the communication port (16) and the mouth of the feeding pipe (3) are connected.

8. The screening device in the production process of sodium carboxymethyl cellulose according to claim 7, characterized in that: Two strip blocks (15) are fixedly connected to the bottom of the bin cover (2), the baffle (6) is engaged between the two strip blocks (15), protrusions (27) are fixedly connected to the outer walls on both sides of the baffle (6), and the outer walls of the strip blocks (15) are provided with slots for the protrusions (27) to engage, and the protrusions (27) slide freely in the slots.

9. The screening device in the production process of sodium carboxymethyl cellulose according to claim 7, characterized in that: The driving assembly comprises a connecting arm (17) fixedly connected to the lower surface of the baffle (6); a driving rod (18) is horizontally fixedly connected to the lower end of the connecting arm (17); a fixed bin (10) is coaxially fixedly connected to the outer wall of the upper end of the fixing sleeve (11); the interior of the fixed bin (10) is hollow; a cam block (29) is sleeved on the periphery of the rotating shaft (23); the cam block (29) is freely rotatable in the fixed bin (10); one end of the driving rod (18) away from the connecting arm (17) is inserted into the fixed bin (10) and is horizontally freely slidable on the fixed bin (10); one end of the driving rod (18) inserted into the fixed bin (10) is rotatably embedded with a ball; the ball rolls in contact with the outer edge of the cam block (29); and a reset unit is provided on the baffle (6).

10. The screening device in the production process of sodium carboxymethyl cellulose according to claim 9, characterized in that: The reset unit comprises an ear block (26) fixed to the bottom surface of the bin cover (2), a sliding rod (14) is horizontally penetrated on the ear block (26), the sliding rod (14) slides freely horizontally on the ear block (26), one end of the sliding rod (14) is fixed to the side wall of the baffle (6), and the other end is sleeved on a limit ring (28), a reset spring (25) is sleeved on the sliding rod (14), and the two ends of the reset spring (25) in the elastic force direction are respectively fixed to the end surface of the limit ring (28) and the outer wall of the ear block (26) correspondingly.

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