Blanking device based on upward expanding type pneumatic bottom valve

Abstract

The utility model relates to a discharging device based on an upward expanding type pneumatic bottom valve, and belongs to the field of discharging devices.The discharging device comprises a hopper, and a conveying opening is formed in the lower end of the hopper; the valve body is connected with the hopper, the valve body is a cavity body with openings in the two ends, the valve body comprises a feeding section and a discharging section which are communicated with each other, a feeding port is formed in the end, away from the discharging section, of the feeding section, and the feeding port is communicated with the conveying port; a discharging opening is formed in one end, far away from the feeding section, of the discharging section; a valve clack is arranged at the position, corresponding to the feeding port, of the feeding section, can seal the feeding port and is provided with a valve rod, an electric rotating push rod is arranged at the end, away from the valve clack, of the valve rod and can drive the valve rod to stretch out and draw back and rotate, the valve rod stretches out and draws back to drive the valve clack to move, and opening and closing of the feeding port are achieved. A scraper is arranged in the feeding section of the valve rod, a brush is arranged at the end of the scraper, the end of the brush abuts against the inner wall of the feeding section, and the inner wall of the feeding section is cleaned by the brush through rotation of the valve rod. The valve has the effect that the valve body is more convenient to clean.

Description

Technical Field

[0001] The present application relates to the field of material discharge devices, and in particular to a material discharge device based on an upward-expanding pneumatic bottom valve. Background Art

[0002] In plastic production applications, it is generally necessary to transport powdered raw materials to a reactor for reaction through a feeding device. The feeding device includes a hopper for holding the raw materials and a discharge valve for controlling the opening and closing of the hopper delivery port.

[0003] A discharge valve is a device mainly used for bottom discharge, discharging, sampling and other operations of reactors, storage tanks and other containers. It can be divided into an upward discharge valve and a downward discharge valve. Existing discharge valves are generally connected to the bottom of the reactor or other containers through the flange at the bottom of the valve body, so as to achieve the purpose of discharging all the materials in the reactor.

[0004] With regard to the above-mentioned related technologies, in the actual production process, the air in the hopper may make the powder damp, and often cause the powder to condense at the entrance of the discharge valve. Long-term operation will cause the discharge valve to be blocked, and the powder cannot be discharged normally. When the discharge valve is blocked, it is generally necessary to separate the discharge valve from the hopper. The maintenance process is cumbersome, which increases maintenance costs and reduces production efficiency. Utility Model Content

[0005] In order to make the cleaning of the discharge valve more convenient, the present application provides a discharge device based on an upward-expanding pneumatic bottom valve.

[0006] The present application provides a feeding device based on an upward-expanding pneumatic bottom valve, which adopts the following technical solution:

[0007] A feeding device based on an upward-expanding pneumatic bottom valve comprises a hopper, a conveying port is provided at the lower end of the hopper; a valve body is connected to the hopper, the valve body is a hollow cavity with openings at both ends, the valve body comprises a connected feeding section and a discharging section, an end of the feeding section away from the discharging section is provided with an inlet, the inlet is connected to the conveying port; an end of the discharging section away from the feeding section is provided with an outlet; a valve flap is provided at the position of the feeding section corresponding to the inlet, the valve flap The feed port can be sealed, the valve disc is provided with a valve stem, and an electric rotating push rod is provided at one end of the valve stem away from the valve disc, the electric rotating push rod can drive the valve stem to extend and rotate, and the extension and contraction of the valve stem drives the valve disc to move, so as to realize the opening and closing of the feed port; the valve stem is provided with a scraper inside the feed section, and a brush is provided at the end of the scraper, and the end of the brush abuts against the inner wall of the feed section. The valve stem rotates to realize the cleaning of the inner wall of the feed section by the brush.

[0008] By adopting the above technical solution, the device uses a scraper and a brush arranged in the valve body. When the feed section is blocked, the electric rotary push rod is started to make the valve stem extend and retract and rotate at the same time, so that the brush can clean the inner wall of the feed section, and the condensed powder at the entrance of the discharge valve can be effectively cleaned to reduce the blockage problem, thereby reducing the number of times the valve body is disassembled, repaired and cleaned, reducing the tediousness of the maintenance process, making the cleaning of the valve body more convenient, and reducing the maintenance cost.

[0009] Optionally, when the feed port is in a sealed state, the scraper is located at one end of the feed section close to the discharge section; the scraper and the valve flap are jointly provided with a connecting sleeve, the valve flap is fixedly connected to one end of the connecting sleeve, and the scraper is fixedly connected to the side wall of the connecting sleeve away from the end of the valve flap; the connecting sleeve is provided with a locking bolt, and the connecting sleeve and the valve stem are detachably connected via the locking bolt.

[0010] By adopting the above technical solution, the scraper is arranged downward, so that when the valve stem is extended and retracted, the cleaning area and cleaning range of the scraper are increased, thereby improving the cleaning efficiency and reducing the degree of blockage. When the valve body is seriously blocked, the operator can remove the locking bolt by disassembling the valve body from the upstream and downstream equipment, extending the valve stem, and extending the locking bolt out of the feed port, and then remove the connecting sleeve from the valve stem, and take out the valve disc and scraper, which makes it easier to clean the feed section and the discharge section.

[0011] Optionally, the end of the valve flap away from the valve stem is a pushing portion, and the pushing portion is conical.

[0012] By adopting the above technical solution, the design of the conical pusher makes it easier for the valve disc to overcome the force of the material when it moves upward to open the inlet. Since the cone can guide the material, this design can effectively reduce the force of the material on the valve disc and reduce the power required to open the valve disc.

[0013] Optionally, the valve flap is a sealing part at one end close to the valve stem, the diameter of the sealing part at one end connected to the valve stem is smaller than the diameter of the feed port, the diameter of the valve flap gradually increases from the end close to the valve stem to the end away from the valve stem, and the diameter of the sealing part at one end away from the valve stem is larger than the diameter of the feed port; the inner side wall at the feed port position is a slope matching the side wall of the sealing part, and the inner side wall at the feed port position can abut against the sealing part to achieve sealing of the feed port.

[0014] By adopting the above technical solution, the inclined design of the sealing part and the side wall has the function of automatic centering. Even if the valve stem and the valve disc have certain deviations during the manufacturing and assembly process, it can ensure that the sealing part of the valve disc can smoothly enter the feed section from the feed port and seal the feed port, thereby improving the reliability and practicality of the valve body.

[0015] Optionally, a stirring assembly is provided inside the hopper, and the stirring assembly includes a stirring motor and a stirring rod driven by the stirring motor, and the stirring rod is divided into a conveying part and a stirring part, and the stirring rod is provided with a spiral blade corresponding to the conveying part, and the stirring rod is provided with a stirring rod corresponding to the stirring part, and the stirring rod is located at the bottom of the blade near the conveying port.

[0016] By adopting the above technical solution, the stirring assembly ensures the uniformity and fluidity of the material during the discharge process by stirring and conveying the material. The spiral blade can push the material to the discharge port and stir the material at the same time to prevent the material from agglomerating. The stirring rod further stirs the material to make it more uniform and reduce the risk of agglomeration, thereby reducing the possibility of valve body clogging.

[0017] Optionally, a control circuit is also included, wherein a flow meter is provided at the position of the discharge section near the discharge port, and the control circuit is electrically connected to the flow meter and the electric rotating push rod; the control circuit receives the flow rate value measured by the flow meter and controls the movement of the electric rotating push rod according to the flow rate.

[0018] By adopting the above technical solution, the control circuit is combined with the flow meter and the electric rotary push rod, which can control the opening and closing state of the valve in real time according to the flow rate, maintain the normal material discharge, realize precise control of the material flow rate, and improve production stability.

[0019] Optionally, the control circuit includes a comparator, which receives a preset value. The comparator is electrically connected to the flow meter, receives the flow rate value measured by the flow meter, and compares the flow rate value with the preset value. When the flow rate is lower than the preset value, the comparator outputs a forward signal, and when the flow rate value is higher than the preset value, the comparator outputs a backward signal. The electric rotary push rod is electrically connected to the comparator, receives the signal output by the comparator, and when the electric rotary push rod receives the forward signal, the electric rotary push rod extends the valve stem; when the electric rotary push rod receives the backward signal, the electric rotary push rod retracts the valve stem.

[0020] By adopting the above technical solution, by comparing the flow rate value with the preset value, when the flow rate is low, the electric rotary push rod extends the valve stem, so that the valve disc moves away from the feed inlet, increasing the feeding speed of the powder. When the flow rate is high, the electric rotary push rod shrinks the valve stem, so that the valve disc moves toward the feed inlet, reducing the feeding speed of the powder, thereby achieving precise control of the powder feeding flow rate.

[0021] Optionally, the valve stem is provided with an indicator rod at an external position of the valve body side wall, and the valve body side wall is provided with scale lines corresponding to the position of the indicator rod, and the indicator rod and the scale lines are used together to indicate the corresponding relationship between the length of the valve stem and the flow rate when there is no blockage.

[0022] By adopting the above technical solution, the corresponding relationship between the valve stem length and the flow rate can be intuitively indicated through the cooperation of the indicator rod and the scale line outside the valve stem, and the actual flow rate can be compared with the scale value, which is convenient for the operator to monitor the status of the valve body. The operator can understand the degree of blockage based on the difference between the actual flow rate and the scale value, and clean the valve body as appropriate.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] 1. The device can effectively clean the condensed powder at the inlet of the discharge valve by controlling the rotation of the valve stem through the scraper and brush arranged in the valve body, reducing the blockage problem, thereby reducing the tediousness of the maintenance process and reducing the maintenance cost;

[0025] 2. The device combines the flow meter and the electric rotary push rod through the control circuit, which can control the opening and closing state and degree of the valve in real time according to the flow rate, realize accurate control of the material flow rate, and improve production stability;

[0026] 3. Through the cooperation of the indicator rod and the scale line outside the valve stem, the corresponding relationship between the valve stem length and the flow rate can be intuitively indicated, and the actual flow rate can be compared with the scale value, which is convenient for the operator to monitor the status of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of a feeding device based on an upward-expanding pneumatic bottom valve in an embodiment of the present application.

[0028] Figure 2 It is a cross-sectional view of a discharge device protruding from a valve body of an upward-expanding pneumatic bottom valve according to an embodiment of the present application.

[0029] Figure 3 It is a structural schematic diagram of a protruding connecting sleeve of a feeding device based on an upward-expanding pneumatic bottom valve in an embodiment of the present application.

[0030] Figure 4 It is a module schematic diagram of a control circuit of a feeding device based on an upward-expanding pneumatic bottom valve according to an embodiment of the present application.

[0031] Explanation of the reference numerals in the accompanying drawings: 1. Hopper; 11. Conveying port; 2. Stirring assembly; 21. Stirring motor; 22. Stirring rod; 221. Conveying part; 2211. Paddle; 222. Stirring part; 2221. Stirring rod; 3. Valve body; 31. Feed section; 311. Feeding port; 32. Discharging section; 321. Discharging port; 33. Flange; 4. Valve flap; 41. Pushing part; 42. Sealing part; 43. Insert rod; 5. Connecting sleeve; 51. Locking bolt; 52. Scraper; 521. Brush; 6. Valve stem; 61. Electric rotary push rod; 7. Flow meter; 8. Comparator; 9. Indicator rod; 91. Scale line. DETAILED DESCRIPTION

[0032] The following is combined with Figure 1-4 This application is described in further detail.

[0033] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0035] The embodiment of the present application discloses a feeding device based on an upward-expanding pneumatic bottom valve. Figure 1 A feeding device based on an upward-expanding pneumatic bottom valve includes a hopper 1 for holding raw materials, and a delivery port 11 is provided at the lower end of the hopper 1. A valve body 3 is provided at the lower end of the hopper 1 corresponding to the delivery port 11, and the valve body 3 is used to control the discharge of the raw materials from the delivery port 11.

[0036] Reference Figure 2A stirring assembly 2 is provided inside the hopper 1. The stirring assembly 2 includes a stirring motor 21 and a stirring rod 22 driven by the stirring motor 21. The stirring rod 22 is divided into a conveying part 221 and a stirring part 222. The stirring rod 22 is provided with a spiral blade 2211 corresponding to the conveying part 221. The spiral blade 2211 can stir and convey the material to ensure the efficiency of material discharge. The stirring rod 22 is provided with a stirring rod 2221 corresponding to the stirring part 222. The stirring rod 2221 is located at the bottom of the blade 2211 near the conveying port 11. The stirring rod 2221 further stirs the material to be discharged, reduces the possibility of agglomeration of the powdered material, and improves the uniformity and smoothness of material discharge.

[0037] Reference Figure 1 and Figure 2 The valve body 3 is a hollow body with openings at both ends. The valve body 3 includes a feed section 31 and a discharge section 32. The feed section 31 and the discharge section 32 are smoothly connected. The feed section 31 is provided with a feed inlet 311 at one end away from the discharge section 32. The feed inlet 311 is connected to the conveying port 11; the discharge section 32 is provided with a discharge outlet 321 at one end away from the feed section 31. The feed section 31 and the discharge section 32 are fixedly connected with flanges 33 at their ends away from each other. The valve body 3 is detachably connected with the upstream equipment and the downstream equipment through the flanges 33. When the valve body 3 fails or is blocked, the valve body 3 can be detached from other equipment to achieve replacement or cleaning of the valve body 3.

[0038] Reference Figure 2 A valve flap 4 is provided at the position of the feed section 31 corresponding to the feed port 311. The valve flap 4 can abut against the feed port 311 to seal the feed port 311, so that the unloading device stops unloading. When the valve flap 4 moves toward the inside of the hopper 1, the feed port 311 opens, so that the unloading device starts unloading.

[0039] Reference Figure 3 The end of the valve disc 4 away from the hopper 1 has a connecting sleeve 5, one end of the connecting sleeve 5 is connected to the valve disc 4, and the other end is open. A valve stem 6 is sleeved in the connecting sleeve 5, and a slide groove along its own length direction is opened on the inner wall of the connecting sleeve 5. The end of the valve stem 6 connected to the connecting sleeve 5 is fixedly connected with a sliding key matching the slide groove, and the sliding key can slide in the slide groove along the length direction of the slide groove. The connecting sleeve 5 is provided with a locking bolt 51, which is threadedly connected to the connecting sleeve 5 and the valve stem 6 to achieve the fixation of the connecting sleeve 5 and the valve stem 6. The locking bolt 51 is located at the position of the connecting sleeve 5 close to the valve disc 4.

[0040] Reference Figure 2 and Figure 3Two scrapers 52 are fixedly connected to the side wall of the connecting sleeve 5 away from the valve disc 4. The two scrapers 52 are located at the same height, and the length direction of the scrapers 52 is perpendicular to the axis of the connecting sleeve 5. When the feed port 311 is in a sealed state, the scrapers 52 are located at the end of the feed section 31 close to the discharge section 32. A brush 521 is fixedly connected to the end of the scraper 52 away from the connecting sleeve 5. The end of the brush 521 abuts against the inner wall of the feed section 31. The valve stem 6 rotates to clean the inner wall of the feed section 31 with the brush 521. The contact between the brush 521 and the inner wall reduces the noise during cleaning and reduces the wear of the inner wall, making the unloading device more reliable and practical.

[0041] When the valve body 3 is clogged and the degree of clogging is relatively light, the valve stem 6 is started to extend and rotate at the same time, so that the brush 521 can clean the inner wall of the feed section 31 and clear the feed section 31. When the valve body 3 is seriously clogged, the operator can disassemble the valve body 3 from the upstream and downstream equipment, extend the valve stem 6, and make the locking bolt 51 extend out of the feed inlet 311, so as to remove the locking bolt 51, and then separate the connecting sleeve 5 from the valve stem 6, and take out the valve disc 4 and the scraper 52, so as to make the cleaning of the feed section 31 and the discharge section 32 more convenient.

[0042] Reference Figure 2 The valve stem 6 is arranged vertically, and the end of the valve stem 6 away from the valve disc 4 extends vertically downward and penetrates the side wall of the valve body 3. The valve stem 6 is rotatably connected to the side wall of the valve body 3. The end of the valve stem 6 away from the valve disc 4 is provided with an electric rotary push rod 61, which is composed of an electric push rod and a motor. The telescopic end of the electric push rod is fixedly connected to the motor, and the output end of the motor is fixedly connected to the valve body 3 coaxially. The electric push rod drives the motor and the valve stem to telescope at the same time, and the motor drives the valve body 3 to rotate. Thus, the effect of the electric rotary push rod 61 driving the valve stem 6 to telescope or rotate is achieved. The electric rotary push rod 61 is fixedly connected to the side wall of the valve body 3, and the telescopic movement of the valve stem 6 drives the valve disc 4 to realize the opening and closing of the feed port 311.

[0043] Further, see Figure 2, the end of the valve flap 4 away from the connecting sleeve 5 is a conical pushing portion 41. Since the valve flap 4 of the upward-expanding discharge valve usually moves upward to open the valve, it is necessary to overcome the force of the material. The conical design can guide the material, thereby reducing the force of the material on the valve flap 4. The end of the valve flap 4 close to the connecting sleeve 5 is a sealing portion 42. The diameter of the end of the sealing portion 42 connected to the valve stem 6 is smaller than the diameter of the feed inlet 311. The diameter of the valve flap 4 gradually increases from the end close to the valve stem 6 to the end away from the valve stem 6. The diameter of the end of the sealing portion 42 away from the valve stem 6 is larger than the diameter of the feed inlet 311; the inner side wall at the position of the feed inlet 311 is an inclined surface matching the side wall of the sealing portion 42. The inner side wall at the position of the feed inlet 311 can abut against the sealing portion 42 to achieve the sealing of the feed inlet 311. The design of the valve flap 4 and the inclined surface of the side wall has the function of automatic centering. Even if there is a certain deviation during the manufacturing process, it can ensure that the sealing portion 42 of the valve flap 4 can smoothly enter the feeding section 31 from the feeding port 311 to seal the feeding port 311.

[0044] Further, see Figure 2 and Figure 3 The end of the valve disc 4 connected to the connecting sleeve 5 is also fixed with a plurality of plug rods 43, the axes of the plurality of plug rods 43 are parallel to the axis of the connecting sleeve 5, and the axes of the plurality of plug rods 43 are distributed around the axis of the connecting sleeve 5. When the feeding section 31 is blocked by powder, the plug rod 43 rises and falls with the valve disc 4 during the extension and retraction of the valve stem 6. During the lifting and lowering of the plug rod 43, the blocked powder may be cleared, thereby reducing the degree of blockage.

[0045] Reference Figure 1 and Figure 4 , a flow meter 7 is provided near the discharge port 321 of the discharge section 32, and the unloading device further comprises a control circuit, which comprises a comparator 8, and the comparator 8 is electrically connected to the flow meter 7 and the electric rotary push rod 61, and the comparator 8 receives a preset value and the flow rate value measured by the flow meter 7, and the comparator 8 compares the flow rate value with the preset value, and when the flow rate value is lower than the preset value, the comparator 8 outputs a forward signal, and when the flow rate value is higher than the preset value, the comparator 8 outputs a backward signal. The electric rotary push rod 61 receives the signal output by the comparator 8, and when the electric rotary push rod 61 receives the forward signal, the electric rotary push rod 61 extends the valve stem 6; when the electric rotary push rod 61 receives the backward signal, the electric rotary push rod 61 contracts the valve stem 6.

[0046] When the flow rate value is lower than the preset value, it means that the opening of the feed inlet 311 is too small, and less powder passes through. At this time, the electric rotary push rod 61 extends the valve stem 6, so that the valve flap 4 moves away from the feed inlet 311, and the powder feeding speed is increased. When the flow rate value is higher than the preset value, it means that the opening of the feed inlet 311 is too large, and more powder passes through. At this time, the electric rotary push rod 61 shrinks the valve stem 6, so that the valve flap 4 moves toward the feed inlet 311, and the powder feeding speed is reduced, thereby realizing accurate control of the powder feeding flow rate.

[0047] Reference Figure 1 The valve stem 6 is also fixedly connected to an indicator rod 9 at the outer position of the side wall of the valve body 3. The outer wall of the valve body 3 is marked with a scale line 91 corresponding to the position of the indicator rod 9. The indicator rod 9 and the scale line 91 are used to indicate the corresponding relationship between the length of the valve stem 6 and the flow rate when it is not blocked. The scale indicated by the indicator rod 9 indicates the flow rate value of the powder in the ideal state (unblocked state) under the current telescopic state of the valve stem 6. The worker can compare the flow rate value detected by the flow meter 7 with the scale indicated by the current indicator rod 9. When the difference between the two is large, it means that the valve body 3 is blocked. The operator can understand the degree of blockage based on the difference and clean the valve body 3 as appropriate.

[0048] The implementation principle of a feeding device based on an upward-expanding pneumatic bottom valve in the embodiment of the present application is as follows: when the feeding device needs to feed, the electric rotary push rod 61 extends the valve stem 6, the valve flap 4 is separated from the feed inlet 311, and the powder is discharged from the hopper 1 through the valve body 3 and out of the feed outlet 321. When feeding stops, the electric rotary push rod 61 contracts the valve stem 6, the valve flap 4 abuts against the side wall at the feed inlet 311, and the feed inlet 311 is closed, and feeding stops at this time.

[0049] During the feeding process, the flow meter 7 detects the flow rate of the discharge port 321. When the flow rate is low, the electric rotary push rod 61 extends the valve stem 6, so that the valve flap 4 moves away from the feed port 311, thereby increasing the feeding speed of the powder. When the flow rate is high, the electric rotary push rod 61 contracts the valve stem 6, so that the valve flap 4 moves toward the feed port 311, thereby reducing the feeding speed of the powder, thereby achieving precise control of the powder feeding flow rate.

[0050] During the unloading process, workers can understand the degree of blockage of the valve body 3 by comparing the flow rate value detected by the flow meter 7 with the scale indicated by the current indicator rod 9. When the blockage is light, the valve stem 6 is started to extend and rotate at the same time, so that the brush 521 can clean the inner wall of the feed section 31 to clear the feed section 31. When the valve body 3 is seriously blocked inside, the operator can detach the valve body 3 from the upstream and downstream equipment, extend the valve stem 6, remove the locking bolt 51, and then separate the connecting sleeve 5 from the valve stem 6, and take out the valve disc 4 and the scraper 52, so that the cleaning of the feed section 31 and the discharge section 32 can be more convenient.

[0051] The embodiment of the present application has the effect of making the cleaning of the valve body 3 more convenient.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A feeding device based on an upward-expanding pneumatic bottom valve, characterized in that: include: A hopper (1), wherein a conveying port (11) is provided at the lower end of the hopper (1); A valve body (3), the valve body (3) being connected to the hopper (1), the valve body (3) being a hollow cavity with openings at both ends, the valve body (3) comprising a feed section (31) and a discharge section (32) being connected to each other, the feed section (31) being provided with a feed inlet (311) at one end away from the discharge section (32), the feed inlet (311) being connected to the conveying port (11); the discharge section (32) being provided with a discharge outlet (321) at one end away from the feed section (31); a valve flap (4) being provided at a position of the feed section (31) corresponding to the feed inlet (311), the valve flap (4) being capable of sealing the feed inlet (311), the valve flap (4) 4) is provided with a valve stem (6), and an electric rotating push rod (61) is provided at one end of the valve stem (6) away from the valve disc (4), and the electric rotating push rod (61) can drive the valve stem (6) to extend and rotate, and the extension and retraction of the valve stem (6) drives the valve disc (4) to move, thereby realizing the opening and closing of the feed inlet (311); the valve stem (6) is provided with a scraper (52) inside the feed section (31), and a brush (521) is provided at the end of the scraper (52), and the end of the brush (521) is in contact with the inner wall of the feed section (31), and the valve stem (6) rotates to realize the brush (521) cleaning the inner wall of the feed section (31).

2. A feeding device based on an upward-expanding pneumatic bottom valve according to claim 1, characterized in that: When the feed port (311) is in a sealed state, the scraper (52) is located at one end of the feed section (31) close to the discharge section (32); the scraper (52) and the valve flap (4) are jointly provided with a connecting sleeve (5), the valve flap (4) is fixedly connected to one end of the connecting sleeve (5), and the scraper (52) is fixedly connected to the side wall of the connecting sleeve (5) away from the end of the valve flap (4); the connecting sleeve (5) is provided with a locking bolt (51), and the connecting sleeve (5) and the valve stem (6) are detachably connected via the locking bolt (51).

3. A feeding device based on an upward-expanding pneumatic bottom valve according to claim 1, characterized in that: The end of the valve flap (4) away from the valve stem (6) is a pushing portion (41), and the pushing portion (41) is in a conical shape.

4. A feeding device based on an upward-expanding pneumatic bottom valve according to claim 3, characterized in that: The end of the valve flap (4) close to the valve stem (6) is a sealing portion (42); the diameter of the end of the sealing portion (42) connected to the valve stem (6) is smaller than the diameter of the feed inlet (311); the diameter of the valve flap (4) gradually increases from the end close to the valve stem (6) to the end away from the valve stem (6); the diameter of the end of the sealing portion (42) away from the valve stem (6) is larger than the diameter of the feed inlet (311); the inner side wall at the feed inlet (311) is an inclined surface matching the side wall of the sealing portion (42); the inner side wall at the feed inlet (311) can abut against the sealing portion (42) to achieve sealing of the feed inlet (311).

5. A feeding device based on an upward-expanding pneumatic bottom valve according to claim 1, characterized in that: A stirring assembly (2) is arranged inside the hopper (1), the stirring assembly (2) comprising a stirring motor (21) and a stirring rod (22) driven by the stirring motor (21), the stirring rod (22) being divided into a conveying portion (221) and a stirring portion (222), the stirring rod (22) being provided with a spiral blade (2211) corresponding to the conveying portion (221), the stirring rod (22) being provided with a stirring rod (2221) corresponding to the stirring portion (222), the stirring rod (2221) being located at the bottom of the blade (2211) close to the conveying port (11).

6. A feeding device based on an upward-expanding pneumatic bottom valve according to claim 1, characterized in that: The device also includes a control circuit. A flow meter (7) is provided at a position of the discharge section (32) near the discharge port (321). The control circuit is electrically connected to the flow meter (7) and the electric rotary push rod (61). The control circuit receives the flow rate value measured by the flow meter (7) and controls the movement of the electric rotary push rod (61) according to the flow rate.

7. A feeding device based on an upward-expanding pneumatic bottom valve according to claim 6, characterized in that: The control circuit comprises a comparator (8), the comparator (8) receives a preset value, the comparator (8) is electrically connected to the flow meter (7), receives the flow rate value measured by the flow meter (7), and compares the flow rate value with the preset value; when the flow rate is lower than the preset value, the comparator (8) outputs a forward signal, and when the flow rate value is higher than the preset value, the comparator (8) outputs a backward signal; The electric rotary push rod (61) is electrically connected to the comparator (8) and receives a signal output by the comparator (8). When the electric rotary push rod (61) receives a forward signal, the electric rotary push rod (61) extends the valve stem (6); when the electric rotary push rod (61) receives a backward signal, the electric rotary push rod (61) contracts the valve stem (6).

8. A feeding device based on an upward-expanding pneumatic bottom valve according to claim 6, characterized in that: The valve stem (6) is provided with an indicator rod (9) at an external position of the side wall of the valve body (3); the side wall of the valve body (3) is provided with a scale line (91) corresponding to the position of the indicator rod (9); the indicator rod (9) and the scale line (91) cooperate to indicate the corresponding relationship between the length of the valve stem (6) and the flow rate when there is no blockage.

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