Hydroxypropyl methyl cellulose screening machine with circulating screening function

Abstract

The hydroxypropyl methyl cellulose screening machine with the circulating screening function comprises a fourth-stage material distributing device, a third-stage material distributing device, a second-stage material distributing device, a first-stage material distributing device and a screening mechanism, the first-stage material distributing device comprises a first-stage material distributing bin, and the lower surface of the first-stage material distributing bin is fixedly connected with a second filter screen mounting base; a sealing clamping groove is formed in the lower surface of the second filter screen installation base, step-by-step circulating screening is achieved through the four-stage material distributing device, impurities and large particles in hydroxypropyl methyl cellulose are effectively filtered out, the screening mechanism is arranged in a detachable mode, an upper filter plate and a lower filter plate in the screening mechanism are overlapped, and the screening efficiency is improved. The size of filter holes is changed by means of the mode that the upper filter plate can be adjusted front and back, the size of materials can be effectively controlled through adjustment according to requirements in circulating screening, meanwhile, cleaning of the filter holes is achieved through a scraper, the problem of blockage caused by long-time use is avoided, and the whole circulating screening process is more efficient.

Description

Technical Field

[0001] The invention relates to the technical field of screening, in particular to a hydroxypropyl methylcellulose screening machine with a cyclic screening function. Background Art

[0002] Hydroxypropyl methylcellulose is a type of non-ionic cellulose mixed ether. It is a semi-synthetic, inactive, viscoelastic polymer, often used as a lubricant in ophthalmology, or as an excipient or excipient in oral drugs, and is commonly found in various types of commodities. As a food additive, hydroxypropyl methylcellulose can play the following roles: emulsifier, thickener, suspending agent and substitute for animal gelatin.

[0003] In the existing production and screening process of hydroxypropyl methylcellulose, the screening machine obtains the final finished material after graded screening through the filter screen. However, during the screening operation, the movement mode of hydroxypropyl methylcellulose in the screening machine is single, and the filter screen will be blocked after long-term use, resulting in the inability to effectively screen the hydroxypropyl methylcellulose. In addition, during the screening operation, the sieve holes of the filter screen are usually fixed in aperture, and cannot be effectively adjusted according to on-site needs during use, affecting the overall screening efficiency. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art, and to provide a hydroxypropyl methylcellulose screening machine with a cyclic screening function. The hydroxypropyl methylcellulose is cyclically screened step by step through a four-stage material dividing device to effectively filter out impurities and larger particles in the hydroxypropyl methylcellulose. The screening mechanism is arranged in a detachable form, and the upper filter plate and the lower filter plate in the screening mechanism overlap with each other. The upper filter plate can be adjusted forward and backward to change the size of the filter hole, so that the cyclic screening can effectively control the size of the material by adjusting it according to demand. At the same time, a scraper is used to clean the filter hole to avoid clogging caused by long-term use, making the entire cyclic screening process more efficient.

[0005] The present invention also provides a hydroxypropyl methylcellulose screening machine with the above-mentioned cyclic screening function, comprising: a fourth-stage material distribution device, a third-stage material distribution device, a second-stage material distribution device, a first-stage material distribution device, and a screening mechanism, wherein the first-stage material distribution device comprises a first-stage material distribution bin, a filter screen mounting seat 2 is fixedly connected to the lower surface of the first-stage material distribution bin, a sealing card groove is provided on the lower surface of the filter screen mounting seat 2, a feed plate is fixedly connected to the upper surface of the first-stage material distribution device, and the lower surface of the first-stage material distribution device is detachably connected to the second-stage material distribution device; The lower surface of the second-stage material distributing device is detachably connected to the third-stage material distributing device, the lower surface of the third-stage material distributing device is detachably connected to the fourth-stage material distributing device, the lower surface of the fourth-stage material distributing device is fixedly connected to an upper bracket, the lower surface of the upper bracket is fixedly connected to a spring, the lower end surface of the spring is fixedly connected to a lower bracket, the left lower surface of the lower bracket is fixedly connected to a support column 2, the right lower surface of the lower bracket is fixedly connected to a support column 1, the lower surface of the upper bracket is fixedly connected to a force guide plate, and the lower surface of the force guide plate is fixedly connected to a vibration motor; The screening mechanism is provided with three groups, and the three groups of screening mechanisms all include a fixed plate, an upper filter plate, and a lower filter plate. The lower surface of the upper filter plate is slidably connected to the upper surface of the lower filter plate, and the left and right ends of the upper filter plate are provided with docking slots. The front surface of the upper filter plate is fixedly connected with a linkage plate 2, and the front surface of the lower filter plate is fixedly connected with a linkage plate 1, and the left and right ends of the linkage plate 1 are provided with locking grooves. The outer surface of the fixed plate is fixedly connected with an L-shaped bracket, and the inner surface of the L-shaped bracket is fixedly connected with a telescopic push rod, and the output end of the telescopic push rod is fixedly connected with the linkage plate 2; The outer surfaces of the upper filter plate and the lower filter plate are both provided with filter holes, and the lower surface of the upper filter plate is fixedly connected with a scraper tooth at each filter hole, and the scraper tooth is slidably connected to the filter holes on the outer surface of the lower filter plate, and the lower surface of the lower filter plate is fixedly connected with a guide rail. There are three groups of screening mechanisms, wherein the first group of screening mechanisms is established at the connection between the first-level material dividing device and the second-level material dividing device, the second group of screening mechanisms is established at the connection between the second-level material dividing device and the third-level material dividing device, and the third group of screening mechanisms is established at the connection between the third-level material dividing device and the fourth-level material dividing device.

[0006] According to a hydroxypropyl methylcellulose screening machine with a cyclic screening function provided by the present invention, the output end of the first-stage material distribution device is fixedly connected to a first discharge port, the output end of the second-stage material distribution device is fixedly connected to a second discharge port, the output end of the third-stage material distribution device is fixedly connected to a third discharge port, and the output end of the fourth-stage material distribution device is fixedly connected to a fourth discharge port. The four discharge ports are used to realize the output of hydroxypropyl methylcellulose of different grades during the screening process.

[0007] According to a hydroxypropyl methylcellulose screening machine with a cyclic screening function provided by the present invention, the second-stage material distribution device includes a secondary material distribution bin, the front surface of the secondary material distribution bin is fixedly connected with a side vertical plate three, the rear surface of the secondary material distribution bin is fixedly connected with a side vertical plate four, the lower port of the secondary material distribution bin is fixedly connected with a filter mounting seat one, the upper port of the secondary material distribution bin is fixedly connected with a bottom support rod two, the upper surface of the bottom support rod two is provided with a guide groove, the upper surfaces of the side vertical plate three and the side vertical plate four are fixedly connected with a sealing strip two, and the docking slot is slidably connected to the left and right sides of the filter mounting seat one.

[0008] According to a hydroxypropyl methylcellulose screening machine with a cyclic screening function provided by the present invention, the lower filter plate in the first group of screening mechanisms is detachably connected to the upper port of the secondary material distribution bin, the guide rail is slidably connected to the guide groove on the upper surface of the bottom support rod 2, the inner surface of the side vertical plate 4 is provided with a slot 2, the lower filter plate and the slot 2 are mutually clamped, the left and right outer surfaces of the side vertical plate 3 are fixedly connected with locking plates 2, the locking plates 2 and the locking grooves are mutually clamped, the outer surface of the side vertical plate 3 is detachably connected to the fixed plate by bolts, and a lower surface of the filter mounting seat is slidably connected to the upper filter plate in the second group of screening mechanisms through a slide groove, and the third-stage material distribution device has the same structure as the second-stage material distribution device.

[0009] According to a hydroxypropyl methylcellulose screening machine with a cyclic screening function provided by the present invention, the upper filter plate in the first group of screening mechanisms is slidably connected to the second filter screen mounting seat, the lower surface of the second filter screen mounting seat is provided with a sealing card slot, the second sealing card strip is connected to the sealing card slot, and the docking slot is slidably connected to the left and right sides of the second filter screen mounting seat, so that the joint is in a sealed state when the connection is realized.

[0010] According to a hydroxypropyl methylcellulose screening machine with a cyclic screening function provided by the present invention, the fourth-stage material distribution device includes a four-stage material distribution bin, the front surface of the four-stage material distribution bin is fixedly connected to a side upright plate 1, the rear surface of the four-stage material distribution bin is fixedly connected to a side upright plate 2, the left and right outer surfaces of the side upright plate 1 are both fixedly connected to a locking plate 1, the upper port of the four-stage material distribution bin is fixedly connected to a bottom support rod 1, and the upper surfaces of the side upright plate 1 and the side upright plate 2 are both fixedly connected to a sealing strip 1.

[0011] According to a hydroxypropyl methylcellulose screening machine with a cyclic screening function provided by the present invention, the lower filter plate in the third group of the screening mechanism is detachably connected to the upper port of the four-stage material distribution bin, the guide rail is slidably connected to the guide groove on the upper surface of the bottom support rod, the inner surface of the side vertical plate 2 is provided with a slot 1, the lower filter plate and the slot 1 are mutually clamped, the locking plate 1 and the locking groove are mutually clamped, the outer surface of the side vertical plate 1 is detachably connected to the fixed plate by bolts, and the upper filter plate is slidably connected to the filter mounting seat in the third-stage material distribution device.

[0012] According to the hydroxypropyl methylcellulose screening machine with cyclic screening function provided by the present invention, the lower end surface of the support column 1 is fixedly connected with a bottom plate, and the left upper surface of the bottom plate is fixedly connected with the support column 2 to realize the support of the entire device.

[0013] Compared with the prior art, the hydroxypropyl methylcellulose screening machine with a cyclic screening function of the present invention realizes step-by-step cyclic screening of hydroxypropyl methylcellulose through a four-stage material dividing device to effectively filter out impurities and larger particles in the hydroxypropyl methylcellulose, and the screening mechanism is arranged in a detachable form, and the upper filter plate and the lower filter plate in the screening mechanism overlap each other.

[0014] Compared with the prior art, the hydroxypropyl methylcellulose screening machine with a cyclic screening function of the present invention uses the method that the upper filter plate can be adjusted forward and backward to change the size of the filter hole, so that the cyclic screening can effectively control the material size by adjusting according to demand, and at the same time use a scraper to clean the filter hole to avoid clogging problems caused by long-term use, making the entire cyclic screening process more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below in conjunction with the accompanying drawings and embodiments; Figure 1 This is an overall structural diagram of a hydroxypropyl methylcellulose screening machine with a cyclic screening function according to the present invention; Figure 2 It is a schematic diagram of the structure of a hydroxypropyl methylcellulose screening machine with a cyclic screening function in a bottom view according to the present invention; Figure 3 It is a side view structural schematic diagram of a hydroxypropyl methylcellulose screening machine with a cyclic screening function of the present invention; Figure 4 It is a schematic diagram of the top view of a hydroxypropyl methylcellulose screening machine with a cyclic screening function according to the present invention; Figure 5 It is a schematic diagram of the filter screen structure of a hydroxypropyl methylcellulose screening machine with a cyclic screening function of the present invention; Figure 6This is a bottom-up structural diagram of a filter screen of a hydroxypropyl methylcellulose screening machine with a cyclic screening function according to the present invention; Figure 7 It is a schematic structural diagram of the fourth-stage screening mechanism of a hydroxypropyl methylcellulose screening machine with a cyclic screening function according to the present invention; Figure 8 This is a schematic diagram of the structure of the second-stage screening mechanism of a hydroxypropyl methylcellulose screening machine with a cyclic screening function according to the present invention; Fig. 9 This is a schematic diagram of the structure of the first-stage screening mechanism of a hydroxypropyl methylcellulose screening machine with a cyclic screening function according to the present invention; Fig.10 This is an enlarged view of the lower surface A of the upper filter plate of a hydroxypropyl methylcellulose screening machine with a cyclic screening function of the present invention.

[0016] Legend: 1. Bottom plate; 2. Support column 1; 3. Lower bracket; 4. Spring; 5. Upper bracket; 6. Support column 2; 7. Fourth-level material distribution device; 701. Bottom support rod 1; 702. Side plate 1; 703. Side plate 2; 704. Sealing card strip 1; 705. Slot 1; 706. Fourth-level material distribution bin; 707. Locking plate 1; 8. Third-level material distribution device; 9. Second-level material distribution device; 901. Side plate 3; 902. Filter screen mounting seat 1; 903. Side plate 4; 904. Sealing card strip 2; 905. Bottom support rod 2; 906. Slot 2; 907. Second-level material distribution bin; 908. Locking plate 2; 10. The first-stage distributing device; 1001, filter screen mounting seat 2; 1002, first-stage distributing bin; 1003, sealing slot; 11, feeding slot; 12, first discharging port; 13, second discharging port; 14, third discharging port; 15, fourth discharging port; 16, screening mechanism; 1601, fixing plate; 1602, L-shaped bracket; 1603, linkage plate 1; 1604, linkage plate 2; 1605, telescopic push rod; 1606, locking slot; 1607, upper filter plate; 1608, lower filter plate; 1609, guide rail; 1610, docking slot; 1611, scraping teeth; 17, force guide plate; 18, vibration motor. DETAILED DESCRIPTION

[0017] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0018] Reference Figure 1-10, the embodiment of the present invention is a hydroxypropyl methylcellulose screening machine with a cyclic screening function, which includes: a fourth-stage material distribution device 7, a third-stage material distribution device 8, a second-stage material distribution device 9, a first-stage material distribution device 10, and a screening mechanism 16, the first-stage material distribution device 10 includes a first-stage material distribution bin 1002, the lower surface of the first-stage material distribution bin 1002 is fixedly connected with a filter mounting seat 1001, the lower surface of the filter mounting seat 1001 is provided with a sealing groove 1003, the upper surface of the first-stage material distribution device 10 is fixedly connected with a feed plate 11, and the lower surface of the first-stage material distribution device 10 is detachably connected to the second-stage material distribution device 9; The lower surface of the second-stage material distribution device 9 is detachably connected to the third-stage material distribution device 8, and the lower surface of the third-stage material distribution device 8 is detachably connected to the fourth-stage material distribution device 7. The lower surface of the fourth-stage material distribution device 7 is fixedly connected to an upper bracket 5, and the lower surface of the upper bracket 5 is fixedly connected to a spring 4. The spring 4 is provided with multiple groups, so that the screening machine is subjected to the high-frequency vibration generated by the vibration motor 18 when it is working, so that the whole machine can effectively follow the vibration. The lower end surface of the spring 4 is fixedly connected to the lower bracket 3, and the lower surface of the left side of the lower bracket 3 is fixedly connected to the support column 2 6, and the lower surface of the right side of the lower bracket 3 is fixedly connected to the support column 1 2, and the support column 1 2 is higher than the support column 2 6, so that the whole screening machine has a certain inclination angle, which is convenient for screening and discharging. The lower surface of the upper bracket 5 is fixedly connected to the guide plate 17, and the lower surface of the guide plate 17 is fixedly connected to the vibration motor 18. The lower end surface of the support column 1 2 is fixedly connected to the bottom plate 1, and the upper surface of the left side of the bottom plate 1 is fixedly connected to the support column 2 6.

[0019] The screening mechanism 16 is provided with three groups, and the three groups of screening mechanisms 16 all include a fixed plate 1601, an upper filter plate 1607, and a lower filter plate 1608. The lower surface of the upper filter plate 1607 is slidably connected to the upper surface of the lower filter plate 1608, and docking slots 1610 are provided at both ends of the upper filter plate 1607. The front surface of the upper filter plate 1607 is fixedly connected with a linkage plate 2 1604, and the front surface of the lower filter plate 1608 is fixedly connected with a linkage plate 1 1603, and the left and right ends of the linkage plate 1 1603 are provided with locking grooves 1606. The outer surface of the fixed plate 1601 is fixedly connected with an L-shaped bracket 1602, and the inner surface of the L-shaped bracket 1602 is fixedly connected with a telescopic push rod 1605. The L-shaped bracket 1602 and the telescopic push rod 1605 are respectively provided with three groups, and are equidistantly distributed on the outer surface of the fixed plate 1601. The three groups of telescopic push rods 1605 are controlled by the same control unit to achieve synchronous movement.

[0020] The output end of the telescopic push rod 1605 is fixedly connected to the linkage plate 2 1604; the outer surfaces of the upper filter plate 1607 and the lower filter plate 1608 are provided with filter holes, and the front and rear distances of the upper filter plate 1607 in the three groups of screening mechanisms 16 are adjusted separately to realize flexible regulation of the filter hole diameter from large to small. The lower surface of the upper filter plate 1607 is fixedly connected with a scraper 1611 at each filter hole, and the scraper 1611 is slidably connected to the filter hole on the outer surface of the lower filter plate 1608. The lower surface of the lower filter plate 1608 is fixedly connected with a guide rail 1609. Among the three groups of screening mechanisms 16, the first group of screening mechanisms 16 is set at the connection between the first-level material distribution device 10 and the second-level material distribution device 9, the second group of screening mechanisms 16 is set at the connection between the second-level material distribution device 9 and the third-level material distribution device 8, and the third group of screening mechanisms 16 is set at the connection between the third-level material distribution device 8 and the fourth-level material distribution device 7.

[0021] The output end of the first-stage material distribution device 10 is fixedly connected with a first discharge port 12, the output end of the second-stage material distribution device 9 is fixedly connected with a second discharge port 13, the output end of the third-stage material distribution device 8 is fixedly connected with a third discharge port 14, and the output end of the fourth-stage material distribution device 7 is fixedly connected with a fourth discharge port 15. The materials produced after screening are respectively discharged through the four discharge ports.

[0022] The second-stage material distributing device 9 comprises a secondary material distributing bin 907, the front surface of which is fixedly connected with a side vertical plate 3 901, the rear surface of which is fixedly connected with a side vertical plate 4 903, the lower port of which is fixedly connected with a filter mounting seat 1 902, the upper port of which is fixedly connected with a bottom supporting rod 2 905, the upper surface of which is provided with a guide groove, the upper surfaces of the side vertical plate 3 901 and the side vertical plate 4 903 are fixedly connected with a sealing strip 2 904, and the docking slot 1610 is slidably connected with the left and right sides of the filter mounting seat 1 902.

[0023] The lower filter plate 1608 in the first screening mechanism 16 is detachably connected to the upper port of the secondary material distribution bin 907, the guide rail 1609 is slidably connected to the guide groove on the upper surface of the bottom support rod 905, the inner surface of the side plate 4 903 is provided with a slot 2 906, the lower filter plate 1608 and the slot 2 906 are mutually clamped, the left and right outer surfaces of the side plate 3 901 are fixedly connected with locking plates 2 908, the locking plates 2 908 and the locking groove 1606 are mutually clamped, the outer surface of the side plate 3 901 is detachably connected to the fixed plate 1601 by bolts, the lower surface of the filter mounting seat 1 902 is slidably connected to the upper filter plate 1607 in the second screening mechanism 16 through a slide groove, and the third-stage material distribution device 8 has the same structure as the second-stage material distribution device 9.

[0024] The upper filter plate 1607 in the first screening mechanism 16 is slidably connected to the second filter mounting seat 1001 , a sealing slot 1003 is provided on the lower surface of the second filter mounting seat 1001 , a sealing strip 904 is connected to the sealing slot 1003 , and a docking slot 1610 is slidably connected to the left and right sides of the second filter mounting seat 1001 .

[0025] The fourth-stage material distribution device 7 includes a fourth-stage material distribution bin 706, the front surface of the fourth-stage material distribution bin 706 is fixedly connected with a side vertical plate 702, the rear surface of the fourth-stage material distribution bin 706 is fixedly connected with a side vertical plate 703, the left and right outer surfaces of the side vertical plate 702 are fixedly connected with a locking plate 707, the upper port of the fourth-stage material distribution bin 706 is fixedly connected with a bottom support rod 701, and the upper surfaces of the side vertical plate 702 and the side vertical plate 703 are fixedly connected with a sealing strip 704.

[0026] The lower filter plate 1608 in the third screening mechanism 16 is detachably connected to the upper port of the fourth-stage material distribution bin 706, the guide rail 1609 is slidably connected to the guide groove on the upper surface of the bottom support rod 701, the inner surface of the side plate 703 is provided with a slot 705, the lower filter plate 1608 and the slot 705 are mutually clamped, the locking plate 707 and the locking groove 1606 are mutually clamped, the outer surface of the side plate 702 is detachably connected to the fixed plate 1601 by bolts, and the upper filter plate 1607 is slidably connected to the filter mounting seat in the third-stage material distribution device 8.

[0027] Working principle: When in use, according to the screening requirements, the filter holes of the three groups of screening mechanisms 16 are adjusted respectively. When adjusting, the upper filter plate 1607 is pushed to translate by the telescopic push rod 1605, so that the filter holes mutually aligned with the lower filter plate 1608 are staggered, and the size of the effective filter holes is changed according to the size of the staggered range. After adjustment, the vibration motor 18 is started, and the hydroxypropyl methylcellulose enters the first-stage material distribution device 10 through the feed chute 11, and the hydroxypropyl methylcellulose is screened by the first group of screening mechanisms 16, and the larger particles are screened. Then it is discharged from the first discharge port 12, and the remaining hydroxypropyl methylcellulose falls into the second-stage distributing device 9, and is screened by the second screening mechanism 16, and the larger particles are tightly screened and discharged from the second discharge port 13. The remaining hydroxypropyl methylcellulose falls into the third-stage distributing device 8, and is screened by the third screening mechanism 16, and the larger particles are tightly screened and discharged from the third discharge port 14. The remaining hydroxypropyl methylcellulose falls into the fourth-stage distributing device 7 and is discharged from the fourth discharge port 15.

[0028] The effective filter holes formed between the upper filter plate 1607 and the lower filter plate 1608, after long-term use, when the filter holes are blocked by hydroxypropyl methylcellulose and impurities, the telescopic push rod 1605 pushes the upper filter plate 1607 to drive the scraper 1611 to move synchronously, and at the same time, the blockage inside the filter hole is cleaned.

[0029] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A hydroxypropyl methylcellulose screening machine with a cyclic screening function, comprising: A fourth-stage material distribution device (7), a third-stage material distribution device (8), a second-stage material distribution device (9), a first-stage material distribution device (10), and a screening mechanism (16), characterized in that the first-stage material distribution device (10) comprises a first-stage material distribution bin (1002), a lower surface of the first-stage material distribution bin (1002) is fixedly connected to a second filter mounting seat (1001), a lower surface of the second filter mounting seat (1001) is provided with a sealing groove (1003), an upper surface of the first-stage material distribution device (10) is fixedly connected to a feed slot (11), and a lower surface of the first-stage material distribution device (10) is detachably connected to the second-stage material distribution device (9); The lower surface of the second-stage material distribution device (9) is detachably connected to the third-stage material distribution device (8), the lower surface of the third-stage material distribution device (8) is detachably connected to the fourth-stage material distribution device (7), the lower surface of the fourth-stage material distribution device (7) is fixedly connected to an upper bracket (5), the lower surface of the upper bracket (5) is fixedly connected to a spring (4), the lower end surface of the spring (4) is fixedly connected to a lower bracket (3), the left lower surface of the lower bracket (3) is fixedly connected to a support column 2 (6), the right lower surface of the lower bracket (3) is fixedly connected to a support column 1 (2), the lower surface of the upper bracket (5) is fixedly connected to a force guide plate (17), and the lower surface of the force guide plate (17) is fixedly connected to a vibration motor (18); The screening mechanism (16) is provided with three groups, each of which comprises a fixed plate (1601), an upper filter plate (1607), and a lower filter plate (1608). The lower surface of the upper filter plate (1607) is slidably connected to the upper surface of the lower filter plate (1608). Both left and right ends of the upper filter plate (1607) are provided with docking slots (1610). The front surface of the upper filter plate (1607) is fixedly connected to a second linkage plate (1604). The front surface of the lower filter plate (1608) is fixedly connected to a linkage plate 1 (1603), and locking grooves (1606) are provided at both left and right ends of the linkage plate 1 (1603). The outer surface of the fixed plate (1601) is fixedly connected to an L-shaped bracket (1602), and the inner surface of the L-shaped bracket (1602) is fixedly connected to a telescopic push rod (1605), and the output end of the telescopic push rod (1605) is fixedly connected to the linkage plate 2 (1604); The outer surfaces of the upper filter plate (1607) and the lower filter plate (1608) are both provided with filter holes. The lower surface of the upper filter plate (1607) is fixedly connected with a scraper tooth (1611) at each filter hole. The scraper tooth (1611) is slidably connected to the filter holes on the outer surface of the lower filter plate (1608). The lower surface of the lower filter plate (1608) is fixedly connected with a guide rail (1609). There are three groups of screening mechanisms (16), wherein the first group of screening mechanisms (16) is established at the connection between the first-stage material dividing device (10) and the second-stage material dividing device (9), the second group of screening mechanisms (16) is established at the connection between the second-stage material dividing device (9) and the third-stage material dividing device (8), and the third group of screening mechanisms (16) is established at the connection between the third-stage material dividing device (8) and the fourth-stage material dividing device (7).

2. A hydroxypropyl methylcellulose screening machine with a cyclic screening function according to claim 1, characterized in that: The output end of the first-stage material distribution device (10) is fixedly connected to a first discharge port (12), the output end of the second-stage material distribution device (9) is fixedly connected to a second discharge port (13), the output end of the third-stage material distribution device (8) is fixedly connected to a third discharge port (14), and the output end of the fourth-stage material distribution device (7) is fixedly connected to a fourth discharge port (15).

3. The hydroxypropyl methylcellulose screening machine with cyclic screening function according to claim 1, characterized in that: The second-stage material distribution device (9) comprises a secondary material distribution bin (907), the front surface of the secondary material distribution bin (907) is fixedly connected to a side vertical plate three (901), the rear surface of the secondary material distribution bin (907) is fixedly connected to a side vertical plate four (903), the lower port of the secondary material distribution bin (907) is fixedly connected to a filter mounting seat one (902), the upper port of the secondary material distribution bin (907) is fixedly connected to a bottom support rod two (905), the upper surface of the bottom support rod two (905) is provided with a guide groove, the upper surfaces of the side vertical plate three (901) and the side vertical plate four (903) are fixedly connected to a sealing strip two (904), and the docking slot (1610) is slidably connected to the left and right sides of the filter mounting seat one (902).

4. The hydroxypropyl methylcellulose screening machine with cyclic screening function according to claim 3, characterized in that: The lower filter plate (1608) in the first group of the screening mechanism (16) is detachably connected to the upper port of the secondary material distribution bin (907), the guide rail (1609) is slidably connected to the guide groove on the upper surface of the bottom support rod (905), the inner surface of the side stand plate (903) is provided with a slot (906), the lower filter plate (1608) and the slot (906) are mutually engaged, and the left and right outer surfaces of the side stand plate (901) are fixedly connected. A locking plate 2 (908) is connected, the locking plate 2 (908) and the locking groove (1606) are mutually engaged, the outer surface of the side plate 3 (901) is detachably connected to the fixing plate (1601) by bolts, the lower surface of the filter screen mounting seat 1 (902) is slidably connected to the upper filter plate (1607) in the second group of the screening mechanism (16) by a sliding groove, and the third-stage material distribution device (8) has the same structure as the second-stage material distribution device (9).

5. The hydroxypropyl methylcellulose screening machine with cyclic screening function according to claim 3, characterized in that: The upper filter plate (1607) in the first group of screening mechanisms (16) is slidably connected to the second filter mounting seat (1001); a sealing groove (1003) is provided on the lower surface of the second filter mounting seat (1001); the second sealing strip (904) is connected to the sealing groove (1003); and the docking slot (1610) is slidably connected to the left and right sides of the second filter mounting seat (1001).

6. The hydroxypropyl methylcellulose screening machine with cyclic screening function according to claim 1, characterized in that: The fourth-stage material distribution device (7) comprises a fourth-stage material distribution bin (706), the front surface of the fourth-stage material distribution bin (706) is fixedly connected with a side vertical plate 1 (702), the rear surface of the fourth-stage material distribution bin (706) is fixedly connected with a side vertical plate 2 (703), the left and right outer surfaces of the side vertical plate 1 (702) are fixedly connected with a locking plate 1 (707), the upper end of the fourth-stage material distribution bin (706) is fixedly connected with a bottom support rod 1 (701), and the upper surfaces of the side vertical plate 1 (702) and the side vertical plate 2 (703) are fixedly connected with a sealing strip 1 (704).

7. A hydroxypropyl methylcellulose screening machine with a cyclic screening function according to claim 6, characterized in that: The lower filter plate (1608) in the third group of screening mechanisms (16) is detachably connected to the upper port of the fourth-stage material distribution bin (706); the guide rail (1609) is slidably connected to the guide groove on the upper surface of the bottom support rod (701); the inner surface of the side plate (703) is provided with a slot (705); the lower filter plate (1608) and the slot (705) are mutually engaged; the locking plate (707) and the locking groove (1606) are mutually engaged; the outer surface of the side plate (702) is detachably connected to the fixing plate (1601) by bolts; and the upper filter plate (1607) is slidably connected to the filter screen mounting seat in the third-stage material distribution device (8).

8. The hydroxypropyl methylcellulose screening machine with cyclic screening function according to claim 1, characterized in that: The lower end surface of the support column 1 (2) is fixedly connected to the bottom plate (1), and the left upper surface of the bottom plate (1) is fixedly connected to the support column 2 (6).

Images