Coating-free tablet screening device

Abstract

The utility model belongs to the technical field of tablet screening devices, and discloses a coating-free tablet screening device which comprises a feeding hopper, a conveying belt, a screening box, a screen, a vibrating device and the like. An outlet of the feeding hopper communicates with a feeding port of the screening box through a conveying belt. A plurality of discharging ports are evenly distributed in the side wall, symmetrical to the feeding port, of the screening box, and a discharging belt is arranged at each discharging port. A screen is arranged at each discharge port in the screening box, the screens are communicated with the discharge belt through the discharge ports, and each screen is obliquely arranged from one end close to the feed port to one end of the discharge port; the aperture of the filtering holes of the upper-layer screen is larger than that of the filtering holes of the lower-layer screen; an air blowing device is arranged above the discharge port and penetrates through the outer wall of the screening box; a plurality of vibration devices are evenly distributed on the outer wall of the screening box in the circumferential direction of the screening box. The device integrates powder removal, unqualified tablet removal and screening, impurities are removed thoroughly, and the tablet screening precision is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to tablet screening device technical field, specifically to a kind of tablet screening device without coating. BACKGROUND

[0002] In the production process of tablet, screening is a crucial link. It is mainly used to remove impurities, powder and unqualified tablets in tablets, and screen according to different specifications of tablets.

[0003] However, the current tablet screening device divides the three processes of powder removal, unqualified tablet removal and screening into different equipment, which is low in production efficiency.

[0004] At the same time, the existing tablet screening device has low screening accuracy, and tablets are easy to accumulate on the screen and remain at the edge of the screen, resulting in incomplete screening and frequent rework.

[0005] In addition, the existing tablet screening device adopts single up-down vibration mode, which causes the tablets to vibrate up and down at the same frequency, and cannot achieve good vibration screening effect. SUMMARY

[0006] The utility model aims at providing a tablet screening device without coating to solve the problems raised in the background.

[0007] To achieve the above purpose, the utility model provides the following technical scheme:

[0008] A tablet screening device without coating, comprising a feed hopper, a conveyor belt, a screening box, a screen, an outlet belt, a suction hood, a suction pipe, a suction fan, a blowing device and a vibration device;

[0009] The outlet of the feed hopper is communicated with the feed inlet of the screening box through the conveyor belt;

[0010] The side wall of the screening box symmetrical to the feed inlet is uniformly provided with a plurality of discharge outlets, each discharge outlet is provided with an outlet belt, and the bottom of the screening box is provided with a residual material outlet;

[0011] The inside of the screening box is provided with a screen at each discharge outlet, and the screen is communicated with the outlet belt through the discharge outlet. Each screen is inclined from one end close to the feed inlet to one end of the discharge outlet;

[0012] Each screen is provided with a filter hole, and the filter hole of the upper screen has a larger aperture than that of the lower screen;

[0013] The top of the screening box is provided with the air suction cover, the other end of the air suction cover is connected with the air suction pipe, and the other end of the air suction pipe is connected with the air suction fan;

[0014] The air blowing device is arranged above the discharge port and penetrates the outer wall of the screening box;

[0015] The outer wall of the screening box is uniformly provided with a plurality of vibration devices along the circumference thereof.

[0016] Further preferably, the vibration device comprises a pneumatic cylinder, the driving end of the pneumatic cylinder is connected with a sliding block, the sliding block is connected with a guide rail, the guide rail is fixedly connected with the outer wall of the screening box, and springs are arranged between the two ends of the sliding block and the guide rail.

[0017] Further preferably, the tablet screening device without coating further comprises a controller, and the controller is electrically connected with the pneumatic cylinder.

[0018] Further preferably, the air blowing device comprises an air blowing cover, one end of the air blowing cover is directed to the inner cavity of the screening box, the other end of the air blowing cover is connected with an air blowing pipe, and the other end of the air blowing pipe is connected with an air blowing fan.

[0019] Further preferably, the screen is in an arc-shaped structure, the arc head is close to the feeding port, the arc tail is close to the discharge port, the installation height of the arc top is less than the installation height of the arc head, and the installation height of the arc top is greater than the installation height of the arc tail.

[0020] Further preferably, a plurality of material blocking plates are alternately arranged on the inner wall of the feeding hopper in the axial direction.

[0021] Further preferably, the vibration frequencies of the plurality of vibration devices are all different.

[0022] Compared with the prior art, the tablet screening device without coating has the following beneficial effects:

[0023] The dust in the tablets is removed by the air suction device, the unqualified tablets are removed and the tablets are screened by the screen and the vibration device, the screened tablets are conveyed to the next process through the discharge belt, and the removed dust and unqualified tablets are uniformly collected and treated, the device integrates the three processes of powder removal, unqualified tablet removal and screening, has high production efficiency and high screening precision, and effectively avoids pollution of the environment and protects the health of workers.

[0024] The plurality of vibration devices are arranged in different vibration modes, the tablets are irregularly vibrated up and down in the screening box, the screen is arranged in an arc-shaped structure, and the tablets are prevented from being left on the edge of the screen, so that the unqualified tablets are removed and the screening is faster and more efficient.

[0025] The powder mixed in the tablet and the tablet burr falling in the conveying process are blown up by the blowing device, so that the powder and the burr impurities are more completely sucked away by the air suction device, the screening effect is better, the precision is higher, and the powder and the impurities are also prevented from flowing out to pollute the environment and harm the human body.

[0026] The utility model discloses a conveying belt conveys the tablet, sets up the baffle in the feed hopper, effectively control the flow of the tablet that enters the screening box, prevent the problem of too big flow, screening is not thorough, screening precision is poor. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is the whole structure schematic diagram of the utility model;

[0028] In the drawing: 1, feed hopper, 2, conveying belt, 3, screening box, 4, screen, 5, discharge belt, 6, residual material port, 7, filter hole, 8, discharge port, 9, air suction cover, 10, air suction pipe, 11, air suction fan, 12, air cylinder, 13, sliding block, 14, guide rail, 15, spring, 16, blowing cover, 17, blowing pipe, 18, blower, 19, baffle, 20, support plate, 21, feed port. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0030] In the description of the utility model, it needs to be explained that the orientation or position relation indicated by the terms "upper", "lower", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relation based on the orientation or position relation shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. In addition, the terms "mounting", "connecting" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected, can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0031] Embodiment 1: as attached Figure 1As shown, the present embodiment provides a tablet screening device without coating, which comprises a feeding hopper 1, a conveying belt 2, a screening box 3, a screen 4, a discharge belt 5, a suction hood 9, a suction pipe 10, a suction fan 11, a blowing device and a vibrating device; the outlet of the feeding hopper 1 is communicated with the feeding port 21 of the screening box 3 through the conveying belt 2; the side wall of the screening box 3 which is symmetrical to the feeding port 21 is uniformly provided with a plurality of discharge ports 8, each of which is provided with a discharge belt 5, and the bottom of the screening box 3 is provided with a residual material port 6; the inside of the screening box 3 is provided with a screen 4 at each discharge port 8, and the screen 4 is communicated with the discharge belt 5 through the discharge port 8; each screen 4 is obliquely arranged from one end close to the feeding port 21 to one end close to the discharge port 8; each screen 4 is provided with a filter hole 7, and the filter hole 7 of the screen 4 in the upper layer has a larger aperture than the filter hole 7 of the screen 4 in the lower layer; the top of the screening box 3 is provided with the suction hood 9, the other end of the suction hood 9 is connected with the suction pipe 10, and the other end of the suction pipe 10 is connected with the suction fan 11; the blowing device is arranged through the outer wall of the screening box 3 above the discharge port 8; and the outer wall of the screening box 3 is uniformly provided with a plurality of vibrating devices along the circumference thereof.

[0032] Specifically, the feeding hopper 1 is located at the top of the device, used for pouring the tablets to be screened into the screening box 3, and is conical in shape; the outlet of the feeding hopper 1 is connected with one end of the conveying belt 2. The conveying belt 2 is used for conveying the tablets from the feeding hopper 1 into the screening box 3, and is made of wear-resistant and corrosion-resistant materials to ensure long-term stable operation. The other end of the conveying belt 2 is communicated with the inside of the screening box 3 through the feeding port 21, and the conveying belt 2 is obliquely arranged; the installation height of one end of the conveying belt 2 connected with the feeding hopper 1 is greater than that of the other end, so as to prevent the tablets from flowing back. The entire device is placed on the surface of the supporting plate 20 for fixation, and the lower surface of the supporting plate 20 is provided with supporting legs.

[0033] The upper part of the side wall of the screening box 3 is provided with the feeding port 21 for facilitating the tablets to enter. The bottom of the screening box 3 is conical in shape, and is provided with the residual material port 6 at the bottom for collecting unqualified tablets and impurities. The screen 4 is fixedly connected with the inner wall of the screening box 3, and is obliquely arranged; the installation height of the side of the screen 4 close to the feeding port 21 is greater than that of the side close to the discharge port 8, which helps to promote the tablets to slide on the screen 4 to the discharge belt 5. The screen 4 is made of wear-resistant, corrosion-resistant and non-deformable materials; the size of the filter hole 7 of each screen 4 is set according to different tablet sizes; the filter hole 7 of the bottommost screen 4 is the smallest, and can only filter out impurities and unqualified tablets. The distance between the centers of two adjacent filter holes 7 of the screen 4 is less than three times the radius of the filter hole 7, so as to prevent the tablets from being temporarily stopped on the partition plate between the filter holes 7 during the screening process.

[0034] The suction hood 9, the suction pipe 10 and the suction fan 11 form a suction device, the suction hood 9 is arranged at the top opening of the screening box 3, and the suction port of the suction hood 9 is adapted to the top opening of the screening box 3, and is used for absorbing dust and small impurities in the tablets. The suction fan 11 is connected with a collection box, which is used for uniformly collecting and processing the collected dust and impurities, so as to avoid environmental pollution and protect the health of workers.

[0035] The blowing device is used for blowing the dust and small impurities mixed in the tablets, so that the suction device can suck them away, and the screening precision and effect are improved. Meanwhile, the blowing device can also promote the movement of the tablets and improve the screening efficiency. The vibration device is used for driving the vibration of the screening box 3, so as to drive the up-down vibration of the tablets and improve the screening efficiency.

[0036] Embodiment 2: as shown in the accompanying Figure 1 On the basis of embodiment 1, the vibration device of the tablet screening device without coating provided by the embodiment comprises a pneumatic cylinder 12, the driving end of the pneumatic cylinder 12 is connected with a sliding block 13, the sliding block 13 is connected with a guide rail 14, the guide rail 14 is fixedly connected with the outer wall of the screening box 3, and springs 15 are arranged between the two ends of the sliding block 13 and the guide rail 14.

[0037] Preferably, three vibration devices are arranged along the outer wall of the screening box 3 and are uniformly arranged in the circumferential direction. The driving end of the pneumatic cylinder 12 moves upward to drive the sliding block 13 to slide, the sliding block 13 slides upward to extrude the spring 15 to move upward, and the spring 15 moves upward to drive the screening box 3 to move upward. When moving downward, the spring 15 plays a buffering and stabilizing vibration effect.

[0038] The device also comprises a controller, which is electrically connected with the pneumatic cylinder 12 and is used for controlling the working frequency of the pneumatic cylinder 12. The controller is a conventional electronic control device, is electrically connected with a plurality of pneumatic cylinders 12 respectively, and is used for accurately controlling the extension and retraction speed and frequency of the pneumatic cylinder 12 by programming or setting parameters, so as to adjust the vibration frequency of the screening box 3.

[0039] The blowing device comprises a blowing hood 16, one end of the blowing hood 16 faces the inner cavity of the screening box 3, the other end of the blowing hood 16 is connected with a blowing pipe 17, and the other end of the blowing pipe 17 is connected with a blowing fan 18. The blowing port of the blowing hood 16 is arranged at the end closer to the support plate 20 of the screen mesh 4, and the tablets can be more thoroughly blown to remove the powder and impurities mixed on the surfaces of the tablets and between the tablets when the tablets are blown and vibrated upward and downward. In addition, the blowing direction is opposite to the direction in which the tablets slide to the discharge belt 5 due to gravity, so that the dust and impurities can be more thoroughly cleaned.

[0040] Embodiment 3: as shown in the accompanying Figure 1As shown, on the basis of embodiment 2, the present embodiment provides a tablet screening device without coating, the screen 4 is an arc structure, the arc head is close to the feeding port 21, the arc tail is close to the discharge port 8, the installation height of the arc top is less than the installation height of the arc head, and the installation height of the arc top is greater than the installation height of the arc tail. The screen 4 is arranged in an arc structure, which solves the technical problems of powder, impurities and tablet residues at the edge of the screen 4.

[0041] The inner wall of the feeding hopper 1 is axially alternately provided with a plurality of baffle plates 19, which can slow down the falling speed of the tablets and make them more uniformly distributed on the conveying belt 2, avoiding tablet blockage and incomplete screening problems.

[0042] The utility model discloses a controller controls the vibration frequency of multiple vibration devices all not same. Specifically, the extension speed and frequency of the air cylinder 12 are adjusted by the controller to control the vibration frequency of the screening box 3. Since the vibration frequencies of the multiple vibration devices are all different, the same frequency vibration of the screening box 3 is avoided to cause the up-down same frequency vibration of the tablets, which is helpful to realize more efficient screening effect.

[0043] When in use, the operator pours the tablet raw material to be screened into the feeding hopper 1. Due to the arrangement of the baffle plate 19, the raw material will slowly and uniformly slide onto the conveying belt 2. Start the conveying belt 2 to convey the tablets from the feeding hopper 1 into the feeding port 21 of the screening box 3, and the speed of the conveying belt 2 can be adjusted according to actual needs.

[0044] After the tablets enter the screening box 3, they first fall on the uppermost screen 4. Under the action of the vibration device, the screening box 3 vibrates up and down at different frequencies, and the tablets continuously vibrate and slide on the screen 4. Smaller tablets fall into the next layer of screen 4 through the filter holes 7 of the screen 4, while larger tablets remain on the current screen 4 and slowly slide towards the discharge port 8, and finally fall into the discharge belt 5 and are conveyed to the next link.

[0045] During the screening process, the dust and fine particles generated are collected by the suction hood 9. The suction fan 11 provides sufficient suction to suck the dust and impurities into the device through the suction pipe 10 and discharge them outside. At the same time, the blowing device is started, and the blowing hood 16 blows the adherents and tablets on the screen 4 to facilitate the suction device to suck away the dust and impurities. Finally, the unqualified tablets and impurities filtered from the lowermost screen 4 are discharged through the residual port 6, together with the dust and impurities collected from the suction device, and are collected and treated uniformly.

[0046] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and in no way limiting, the scope of the present application being defined by the claims hereafter rather than the above description, and all changes falling within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein, any reference signs in the claims not being considered as limiting the claims in question.

[0047] The above description is merely preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art, according to the technical solution and the inventive concept of the present application, can make equivalent substitutions or changes within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A tablet screening apparatus without coating, characterized by, It comprises a feeding hopper (1), a conveying belt (2), a screening box (3), a screen (4), a discharging belt (5), an air suction hood (9), an air suction pipe (10), an air suction fan (11), a blowing device and a vibrating device. The outlet of the feeding hopper (1) is communicated with the feeding port (21) of the screening box (3) through the conveying belt (2). The side wall of the screening box (3) symmetrical to the feeding port (21) is uniformly provided with a plurality of discharging ports (8), and the discharging belt (5) is arranged at each discharging port (8), and the bottom of the screening box (3) is provided with a residual material port (6). The inside of the screening box (3) is provided with the screen (4) at each discharging port (8), and the screen (4) is communicated with the discharging belt (5) through the discharging port (8), and each screen (4) is arranged obliquely from one end close to the feeding port (21) to one end close to the discharging port (8). Each screen (4) is provided with a filter hole (7), and the filter hole (7) of the screen (4) on the upper layer has a larger aperture than the filter hole (7) of the screen (4) on the lower layer. The top of the screening box (3) is provided with the air suction hood (9), the other end of the air suction hood (9) is connected with the air suction pipe (10), and the other end of the air suction pipe (10) is connected with the air suction fan (11). The blowing device is arranged above the discharging port (8) and penetrates the outer wall of the screening box (3). The outer wall of the screening box (3) is uniformly provided with a plurality of vibrating devices along the circumference thereof.

2. A non-coated tablet screening device according to claim 1, wherein, The vibrating device comprises a gas cylinder (12), the driving end of the gas cylinder (12) is connected with a sliding block (13), the sliding block (13) is connected with a guide rail (14), the guide rail (14) is fixedly connected with the outer wall of the screening box (3), and springs (15) are arranged between the two ends of the sliding block (13) and the guide rail (14).

3. A non-coated tablet screening device according to claim 2, wherein, A controller is further arranged and electrically connected with the gas cylinder (12).

4. A non-coated tablet screening device according to claim 1, wherein, The blowing device comprises a blowing hood (16), one end of the blowing hood (16) faces the inner cavity of the screening box (3), the other end of the blowing hood (16) is connected with a blowing pipe (17), and the other end of the blowing pipe (17) is connected with a blowing fan (18).

5. A non-coated tablet screening device according to claim 1, wherein, The screen (4) is in an arc structure, the arc head is close to the feeding port (21), the arc tail is close to the discharging port (8), the installation height of the arc top is less than the installation height of the arc head, and the installation height of the arc top is greater than the installation height of the arc tail.

6. A non-coated tablet screening device according to claim 1, wherein, A plurality of material blocking plates (19) are alternately arranged on the inner wall of the feeding hopper (1) along the axial direction.

7. A non-coated tablet screening device according to claim 1, wherein, The vibration frequencies of the plurality of vibrating devices are all different.

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