An automatic screening device for spherical flat propellant

Abstract

The invention discloses an automatic screening device for spherical flat propellant, comprising: a hydraulic motor, a flexible connection, a connecting shaft, an eccentric block, a connecting spring, a lower process screen, an upper process screen, a lower fixed screen, an upper fixed screen, an electrostatic conductive bouncing ball, an electrostatic conductive movable rubber ring, an annular flow guiding retaining ring and a hydraulic station. The hydraulic motor drives the connecting shaft to rotate, drives the eccentric block to rotate, and the centrifugal force generated by the rotation of the eccentric block drives the connecting spring to deform, thereby driving the lower process screen, the lower fixed screen, the upper process screen, and the upper fixed screen to vibrate, and screen the material; the upper process screen screens out the material with too large a particle size, and the lower process screen screens out the material with too small a particle size, and an annular flow guiding retaining ring is fixed on the upper process screen and the lower process screen respectively to guide the material, and the electrostatic conductive bouncing ball is arranged on the upper fixed screen and the lower fixed screen to clean the upper process screen and the lower process screen. The invention can realize the continuous automatic and safe screening of spherical flat propellant.

Description

Technical Field

[0001] The invention belongs to the technical field of propellant production and relates to an automatic screening device for spherical flat propellant. Background Art

[0002] As the most ideal launch energy source for small-caliber barreled weapons, spherical propellant is the main power and destructive energy source for weapons and equipment to achieve single-soldier combat and precision strikes. At present, in the production process of dangerous goods such as propellants, screening is an indispensable process. The purpose of screening is to remove particles that are too large or too small in the material to ensure the consistency of the material size distribution. The consistency of the product directly affects the burning rate and combustion stability of the propellant. In order to control the product quality, some products even need to be screened 2 to 3 times in different ways during the entire production process. The screening methods adopted in the industry mainly include fixed inclined screens, vibrating inclined screens, drum screens, swing screens, vertical cylindrical centrifugal screens, etc. None of them fully realizes the isolation between man and machine. They require manual feeding, manual cleaning of screens, manual material transfer, etc. to varying degrees, which makes the operation site have risks such as gunpowder explosion, mechanical injury, and other injuries. Due to the flammable and explosive characteristics of the material itself, and the long-term state of motion, coupled with the dust distribution in the surrounding environment, the above safety risks are exacerbated. Therefore, studying the automatic screening process and equipment of propellants is of great significance to improving the quality reliability of propellants, improving the on-site working environment, and improving the inherent safety of the process. Summary of the invention

[0003] The purpose of the present invention is to provide an automatic screening device for spherical flat propellant, which can realize continuous automatic and safe screening of spherical flat propellant.

[0004] One aspect of the present invention provides an automatic screening device for spherical flat propellant, comprising: a hydraulic motor, a flexible connection, a connecting shaft, an eccentric block, a connecting spring, a lower process screen, an upper process screen, a lower fixed screen, an upper fixed screen, an electrostatic conductive bouncing ball, an electrostatic conductive movable rubber ring, an annular guide retaining ring and a hydraulic station;

[0005] The hydraulic motor is connected to the connecting shaft through the soft connection, an eccentric block is fixed to the upper end and the lower end of the connecting shaft respectively, the hydraulic station is used to provide the hydraulic motor with pressure energy of hydraulic oil, the hydraulic motor is used to convert the pressure energy provided by the hydraulic station into mechanical energy, and drive the connecting shaft to rotate, the lower process screen, the lower fixed screen, the upper process screen, and the upper fixed screen are connected to the connecting shaft through the connecting spring, the rotation of the connecting shaft drives the eccentric block to rotate, and the centrifugal force generated by the rotation of the eccentric block drives the connecting spring to deform, thereby driving the lower process screen, the lower fixed screen, the upper process screen, and the upper fixed screen to vibrate, so as to screen the material;

[0006] The upper process screen has an upper screen outlet, and the lower process screen has a lower screen outlet. The mesh aperture of the upper process screen is larger than the mesh aperture of the lower process screen. The upper process screen is used to screen out materials with too large particle sizes, which flow out from the upper screen outlet as defective materials. Materials with particle sizes smaller than the mesh aperture of the upper process screen pass through the upper process screen and enter the lower process screen. The lower process screen is used to screen out materials with too small particle sizes, which flow out from the bottom of the lower process screen as defective materials, and other materials flow out from the lower screen outlet as qualified products.

[0007] The upper fixed screen and the lower fixed screen are respectively arranged below the upper process screen and the lower process screen, the mesh aperture of the upper fixed screen is not less than the mesh aperture of the upper process screen, and the mesh aperture of the lower fixed screen is not less than the mesh aperture of the lower process screen, the electrostatic conductive bouncing balls are arranged on the upper fixed screen and the lower fixed screen, and are used for cleaning the upper process screen and the lower process screen, and the electrostatic conductive movable rubber ring is arranged on the upper fixed screen and the lower fixed screen, and is used for concentrating the electrostatic conductive bouncing balls in the electrostatic conductive movable rubber ring;

[0008] The annular guide retaining ring is fixed on the upper process screen and the lower process screen respectively, and the annular guide retaining ring is concentrically arranged with the upper process screen and the lower process screen. A material outflow channel is formed between the annular guide retaining ring and the screen frames of the upper process screen and the lower process screen. Materials with too large particle sizes flow out from the upper screen outlet through the material outflow channel as defective materials, and qualified materials flow out from the lower screen outlet through the material outflow channel.

[0009] Preferably, the device also includes: a guide ring support, the annular guide ring is connected to the screen frames of the upper process screen and the lower process screen through the guide ring support, and a gap is left between the bottom of the guide ring support and the screen meshes of the upper process screen and the lower process screen to allow materials to pass through.

[0010] Preferably, the annular guide baffle has an opening, and the material flows out from the opening, passes through the gap below the guide baffle support, and flows out from the upper screen outlet or the lower screen outlet through the material outflow channel.

[0011] Preferably, the starting point of the annular guide ring is located on one side of the upper screen outlet or the lower screen outlet, and the end point is located on the other side of the upper screen outlet or the upper screen outlet, and the opening is formed between the starting point and the end point.

[0012] Preferably, 250 to 300 electrostatically conductive bouncing balls are arranged on the upper fixed screen and the lower fixed screen, respectively.

[0013] Preferably, the device further comprises: a buffer hopper for feeding materials, a feed pipe is installed below the buffer hopper, and materials flow out from the feed pipe of the buffer hopper and continuously fall onto the upper process screen.

[0014] Preferably, the device further comprises a pneumatic pipe clamp valve and a manual pipe clamp valve, wherein the pneumatic pipe clamp valve is used to control the switch of the discharge pipe, and the manual pipe clamp valve is used to adjust the flow rate of the material in the discharge pipe.

[0015] The automatic screening device for spherical flat propellants according to the above aspects of the present invention can realize continuous automatic and safe screening of spherical flat propellants, thereby realizing human-machine isolation at dangerous working sites and improving the inherent safety of the screening process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0017] Figure 1 It is a schematic structural diagram of an automatic screening device for spherical flat propellants according to an embodiment of the present invention.

[0018] Figure 2 yes Figure 1 A partial enlarged view of part A in FIG.

[0019] Figure 3 It is a top view of an automatic screening device for spherical flat propellants according to one embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] An embodiment of the present invention provides an automatic screening device for spherical flat propellant. Figure 1 It is a schematic structural diagram of an automatic screening device for spherical flat propellants according to an embodiment of the present invention. Figure 2 yes Figure 1 A partial enlarged view of part A in FIG. Figure 3 FIG. 1 is a top view of an automatic screening device for spherical flat propellants according to an embodiment of the present invention. Figure 1-Figure 3 As shown, the automatic screening device for spherical flat propellants according to the embodiment of the present invention includes a hydraulic motor 1, a flexible connection 2, a connecting shaft 3, an eccentric block 4, a lower fixed screen 5, a lower process screen 6, an upper fixed screen 7, an electrostatically conductive bouncing ball 8, an electrostatically conductive movable rubber ring 9, an annular guide ring 10, an upper process screen 11, a connecting spring 13 and a hydraulic station (not shown in the figure).

[0022] The hydraulic motor 1 is connected to the connecting shaft 3 through a flexible connection 2. The flexible connection 2 can be a belt-type flexible connection. The hydraulic motor 1 converts pressure energy into mechanical energy through a hydraulic station, and is the power source of the automatic screening device for spherical flat propellant in the embodiment of the present invention. An eccentric block 4 is fixed to the upper and lower ends of the connecting shaft 3 by bolts or the like. The hydraulic station provides the hydraulic oil pressure energy to the hydraulic motor 1, and the hydraulic motor 1 converts the pressure energy provided by the hydraulic station into mechanical energy, driving the connecting shaft 3 to rotate, and the lower process screen 6, the lower fixed screen 5, the upper process screen 11, and the upper fixed screen 7 are connected to the connecting shaft 3 through a connecting spring 13. The rotation of the connecting shaft 3 drives the eccentric block 4 to rotate, and the centrifugal force generated by the rotation of the eccentric block 4 drives the connecting spring 13 to deform, thereby driving the lower process screen 6, the lower fixed screen 5, the upper process screen 11, and the upper fixed screen 7 to vibrate, and the material is screened. By adjusting the pressure input by the hydraulic station, the rotation speed of the eccentric block 4 can be adjusted, thereby adjusting the vibration frequency of the screening device. By adjusting the relative positions of the two eccentric blocks 4 (i.e. adjusting the angle), the vibration amplitude can be adjusted, thereby adjusting the screening quality and screening capacity of the screening device.

[0023] The upper process screen 11 has an upper screen outlet 12, and the lower process screen 6 has a lower screen outlet 15. The mesh aperture of the upper process screen 11 is larger than that of the lower process screen 6. The upper process screen 11 is used to screen out materials with too large particle sizes, which flow out from the outlet of the upper process screen 11 as defective materials. Materials with particle sizes smaller than the mesh aperture of the upper process screen 11 pass through the upper process screen 11 and enter the lower process screen 6. The lower process screen 6 is used to screen out materials with too small particle sizes, which flow out from the bottom of the lower process screen 6 as defective materials. Other materials flow out from the outlet of the lower process screen 6 as qualified products and enter the next process.

[0024] During the screening process, materials smaller than the mesh size pass through the mesh of the upper process screen 11 and enter the lower process screen 4. Materials with larger particle sizes run along a certain trajectory on the upper process screen 11 for a period of time, then jump into the upper screen outlet 12 and enter the waste collector. The lower process screen 4 has a smaller aperture and is mainly used to separate materials with smaller particle sizes. Qualified products flow out from the lower process screen outlet, while undersized materials flow out from the bottom outlet of the lower process screen 4.

[0025] An upper fixed screen 7 and a lower fixed screen 5 are respectively arranged below the upper process screen 11 and the lower process screen 6. The mesh aperture of the upper fixed screen 7 is not less than the mesh aperture of the upper process screen 11, and the mesh aperture of the lower fixed screen 5 is not less than the mesh aperture of the lower process screen 6, so that the materials passing through the upper process screen 11 and the lower process screen 6 can pass through the upper fixed screen 7 and the lower fixed screen 5 respectively. Static-conducting bouncing balls 8 are arranged on the upper fixed screen 7 and the lower fixed screen 5 for automatic cleaning of the meshes of the upper process screen 11 and the lower process screen 4. Generally, 250 to 300 of them can be arranged on each fixed screen. The static conductive movable rubber ring 9 is arranged on the upper process screen 11 and the lower process screen 4, and is used to concentrate a plurality of static conductive bouncing balls 8 in the static conductive movable rubber ring 9, thereby restricting a portion of the static conductive bouncing balls 8 to a certain area and effectively dispersing them, thereby preventing the static conductive bouncing balls 8 from gathering in the same vibration environment and affecting the screening effect.

[0026] The blocking materials are mostly rod-shaped, spindle-shaped, needle-shaped, etc. Such materials will get stuck in the mesh holes and block the mesh holes. A layer of upper fixed screen 7 and lower fixed screen 5 with large apertures are arranged below the upper process screen 11 and the lower process screen 4, and electrostatically conductive bouncing balls 8 of a certain size are arranged on the upper fixed screen 7 and the lower fixed screen 5. To ensure that the bouncing balls can be distributed in different areas, 2 to 4 bouncing balls are divided into a group and bound in a relatively fixed position using an electrostatically conductive movable rubber ring 9. When the mesh holes are vibrated to clean, the blocking particles in different positions can be ejected, thereby achieving the purpose of cleaning the screen.

[0027] There are two annular guide retaining rings 10, which are fixed on the upper process screen 11 and the lower process screen 6 respectively, and are concentrically arranged with the upper process screen 11 and the lower process screen 6. A material outflow channel is formed between the annular guide retaining ring 10 and the screen frames of the upper process screen 11 and the lower process screen 6. Materials with too large particle sizes are regarded as defective materials and flow out from the outlet of the upper process screen 11 through the material outflow channel, and qualified materials flow out from the outlet of the lower process screen 6 through the material outflow channel.

[0028] The height of the annular flow guide ring 10 is, for example, about half the height of the screen frame of the upper process screen 11 and the lower process screen 6, and can be fixed to the upper process screen 11 and the lower process screen 6 by anti-drop bolts. In one embodiment, the automatic screening device for spherical flat propellant of the embodiment of the present invention further includes a flow guide ring support 16, and the two annular flow guide rings 10 are respectively connected to the screen frame of the upper process screen 11 or the lower process screen 6 through the flow guide ring support 16, and a certain gap is reserved below the flow guide ring support 16 and the screen mesh of the upper process screen 11 or the lower process screen 6, so that the material can pass smoothly.

[0029] The annular guide ring 10 is used to automatically guide the material, which can optimize the dispersion mode and running track of the material, make the residence time of the material on the screen surface more reasonable, and effectively improve the screening quality. Figure 3 As shown, the annular guide ring 10 has an opening, and the material flows out from the opening, passes through the gap below the guide ring support 16, and flows out from the outlet of the upper process screen 11 or the outlet of the lower process screen 6 through the material outflow channel. The starting point of the annular guide ring 10 is located on one side of the upper screen outlet 12 to prevent the material from bypassing the outlet and continuing to move forward after moving one circle. The end point is located on the other side of the outlet and ends at the other side of the upper screen outlet 12. The opening of the annular guide ring 10 is formed between the starting point and the end point. When the material flows into the middle of the screen of the upper process screen 11 from above, a part of the material flows out from the opening on the left side of the annular guide ring 10 under the action of vibration, and vibrates forward around the material outflow channel between the annular guide ring 10 and the screen frame until the oversized material enters the upper screen outlet 12 and flows out. A portion of the material that does not flow out of the opening on the left side of the annular guide retaining ring 10 overflows from the edge of the annular guide retaining ring 10 as the material accumulates, and then vibrates forward until it flows out from the upper screen outlet 12, completing the classification of the oversized material. Similarly, the undersized material is screened in the screen of the lower process screen, and the qualified product flows out from the lower screen outlet 15 and enters the next process.

[0030] In order to achieve continuous feeding, the automatic screening device for spherical flat propellant of the embodiment of the present invention may also include a buffer hopper, a pneumatic pipe clamp valve and a manual pipe clamp valve for feeding. A feeding pipe is installed below the buffer hopper. The screened material enters the buffer hopper by air conveying, and the material flows out from the feeding pipe of the buffer hopper and continuously falls in the center of the upper process screen 11. The feeding amount of the feeding pipe is controlled by a pneumatic pipe clamp valve and a manual pipe clamp valve, wherein the pneumatic pipe clamp valve is used to control the switch of the feeding pipe, and the manual pipe clamp valve is used to adjust the flow rate of the material in the feeding pipe to ensure that the feeding speed is within a controllable range.

[0031] In one embodiment, the automatic screening device for flat spherical propellants of the embodiment of the present invention may also include a skirt 14, which serves as a supporting mechanism for the main mechanism of the screening device, and is used to support the lower fixed screen 5, the lower process screen 6, the upper fixed screen 7, the upper process screen 11, etc.

[0032] The working process of the automatic screening device for spherical flat propellant according to the embodiment of the present invention is described below by using an example.

[0033] 1) After 100kg of spherical propellant with a particle size of 1.1-1.6mm is flattened, a large amount of graphite adheres to the surface. A 30kw blower is used to send positive pressure air to the buffer hopper in a DN80 steel pipe.

[0034] 2) Because the surface of the material is completely covered by graphite and has excellent fluidity, the flow rate of materials with different particle sizes in the same pipe mouth is quite different. The valve opening of the discharge pipe is adjusted in advance through the manual pipe clamp valve to control the material flow, and then the pneumatic pipe clamp valve is opened to discharge the material.

[0035] 3) The mesh size of the upper process screen 11 is 0.85mm, and the mesh size of the lower process screen 4 is 0.50mm. Turn on the 11kw hydraulic station, control the valve opening at about 40%, and preheat. After preheating for 5 minutes, turn on the screening device. The screening device enters a stable operating state after running for about 1 minute. At this time, the amplitude is 2.3-4.6mm and the frequency is 200-280Hz. Open the pneumatic pipe clamp valve on the buffer hopper to allow the material to enter the center of the upper process screen 11 with a diameter of Φ1200mm from the feed pipe. In order to ensure the residence time of the material on the screen and ensure the screening quality, the upper process screen 11 is provided with a 50mm high annular guide ring 10 to extend the residence time of the material on the screen and improve the screening quality. During the screening process, the needle-shaped, rod-shaped, and spindle-shaped materials formed by flattening will drill into the screen holes and get stuck, forming plugged holes.

[0036] 4) The screen is cleaned by arranging a layer of large-aperture fixed screen 30 mm below the upper and lower process screens, and filling the middle with 250 to 300 Φ20 electrostatic conductive bouncing balls 8. The electrostatic conductive bouncing balls 8 are relatively fixed by electrostatic conductive movable rubber rings 9 to ensure that during the bouncing process, the small balls are concentrated at the blocking position to forcibly squeeze out the blocking materials on the upper screen.

[0037] 5) After the oversized diameter materials are removed by the upper process screen 11, the materials enter the lower process screen 4, and the small particle size materials enter the bottom layer of the screening device through the lower process screen 4. Under the action of rotation and vibration, they converge to the discharge port and are collected uniformly. The qualified products flow out from the lower screen outlet 15 and enter a metering weighing flip hopper for weighing and transfer out.

[0038] The screening results are as follows:

[0039] 1) 100 kg of good products were screened and 4.8 kg of undersized medicine was screened out: the screening effect of the screening device in the embodiment of the present invention is higher than the screening quality of the existing rotary vibrating screen.

[0040] 2) 100 kg of the flattened original material was screened three times, and an average of 12.4 kg of unqualified materials were screened out, including 0.8 kg of oversize material and 11.6 kg of undersize material. The screening time was 582 seconds, and the screening capacity of the screening device according to the embodiment of the present invention was 618 kg / h.

[0041] 3) 100 kg of material screened by the screening device according to the embodiment of the present invention (all the oversize, 5 kg of undersize, and 5 kg of qualified products) was manually screened three times using a 0.85 mm standard sieve and a 0.50 mm standard sieve. The results are as follows:

[0042] All the materials on the sieve cannot pass through the standard sieve mesh; the good products are manually screened using the upper and lower process sieves. There is no material on the upper process sieve, and there is a very small amount of material on the lower process sieve, which can be ignored; all the materials under the sieve pass through the 0.5mm standard sieve.

[0043] The results show that the screening device according to the embodiment of the present invention achieves a good screening effect.

[0044] As described above, the automatic screening device for flat spherical propellants of the embodiment of the present invention can realize the automation and continuity of the process, greatly reduce the number of operators at dangerous work sites, realize the isolation of man and machine at dangerous work sites, and improve the inherent safety of the screening process, by using technologies such as automatic material diversion in the screen and automatic screening of electrostatic bouncing balls, compared with the existing inclined vibrating screen. In addition, the automatic screening device for flat spherical propellants of the embodiment of the present invention uses hydraulic power as the power, avoiding the safety risks caused by the fall-off, wear, leakage, etc. of the wires caused by the use of motor drive, and the long-term high-frequency vibration of various electrical components and wires.

[0045] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An automatic screening device for spherical flat propellant, characterized in that: include: Hydraulic motor, flexible connection, connecting shaft, eccentric block, connecting spring, lower process screen, upper process screen, lower fixed screen, upper fixed screen, static conductive bouncing ball, static conductive movable rubber ring, annular flow guide ring and hydraulic station; The hydraulic motor is connected to the connecting shaft through the soft connection, an eccentric block is fixed to the upper end and the lower end of the connecting shaft respectively, the hydraulic station is used to provide the hydraulic motor with pressure energy of hydraulic oil, the hydraulic motor is used to convert the pressure energy provided by the hydraulic station into mechanical energy, and drive the connecting shaft to rotate, the lower process screen, the lower fixed screen, the upper process screen, and the upper fixed screen are connected to the connecting shaft through the connecting spring, the rotation of the connecting shaft drives the eccentric block to rotate, and the centrifugal force generated by the rotation of the eccentric block drives the connecting spring to deform, thereby driving the lower process screen, the lower fixed screen, the upper process screen, and the upper fixed screen to vibrate, so as to screen the material; The upper process screen has an upper screen outlet, and the lower process screen has a lower screen outlet. The mesh aperture of the upper process screen is larger than the mesh aperture of the lower process screen. The upper process screen is used to screen out materials with too large particle sizes, which flow out from the upper screen outlet as defective materials. Materials with particle sizes smaller than the mesh aperture of the upper process screen pass through the upper process screen and enter the lower process screen. The lower process screen is used to screen out materials with too small particle sizes, which flow out from the bottom of the lower process screen as defective materials, and other materials flow out from the lower screen outlet as qualified products. The upper fixed screen and the lower fixed screen are respectively arranged below the upper process screen and the lower process screen, the mesh aperture of the upper fixed screen is not less than the mesh aperture of the upper process screen, and the mesh aperture of the lower fixed screen is not less than the mesh aperture of the lower process screen, the electrostatic conductive bouncing balls are arranged on the upper fixed screen and the lower fixed screen, and are used for cleaning the upper process screen and the lower process screen, and the electrostatic conductive movable rubber ring is arranged on the upper fixed screen and the lower fixed screen, and is used for concentrating the electrostatic conductive bouncing balls in the electrostatic conductive movable rubber ring; The annular flow guide ring is fixed on the upper process screen and the lower process screen respectively, and the annular flow guide ring is concentrically arranged with the upper process screen and the lower process screen, and a material outflow channel is formed between the annular flow guide ring and the screen frames of the upper process screen and the lower process screen, and the material with too large particle size flows out from the upper screen outlet through the material outflow channel as defective material, and the qualified material flows out from the lower screen outlet through the material outflow channel; The automatic screening device for spherical flat propellant also includes: a guide ring support, the annular guide ring is connected to the screen frames of the upper process screen and the lower process screen through the guide ring support, and a gap is left between the bottom of the guide ring support and the screen meshes of the upper process screen and the lower process screen to allow materials to pass through.

2. The automatic screening device for spherical flat propellant according to claim 1, characterized in that: The annular flow guide retaining ring has an opening, and the material flows out from the opening, passes through the gap below the flow guide retaining ring support, and flows out from the upper screen outlet or the lower screen outlet through the material outflow channel.

3. The automatic screening device for spherical flat propellant according to claim 2, characterized in that: The starting point of the annular guide retaining ring is located on one side of the upper screen outlet or the lower screen outlet, and the end point is located on the other side of the upper screen outlet or the upper screen outlet, and the opening is formed between the starting point and the end point.

4. The automatic screening device for spherical flat propellant according to any one of claims 1 to 3, characterized in that: 250 to 300 electrostatically conductive bouncing balls are arranged on the upper fixed screen and the lower fixed screen respectively.

5. The automatic screening device for spherical flat propellant according to any one of claims 1 to 3, characterized in that: Also includes: A buffer hopper for feeding materials, a feeding pipe is installed below the buffer hopper, and materials flow out from the feeding pipe of the buffer hopper and continuously fall on the upper process screen.

6. The automatic screening device for spherical flat propellant according to claim 5, characterized in that: It also includes a pneumatic pipe clamp valve and a manual pipe clamp valve. The pneumatic pipe clamp valve is used to control the switch of the feeding pipe, and the manual pipe clamp valve is used to adjust the flow of the material in the feeding pipe.

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