Automatic filling device for pyrotechnic powder tablet press

Abstract

The invention discloses an automatic filling device for a pyrotechnic tablet press, which relates to the technical field of pyrotechnic manufacturing, and includes a spiral feeding barrel and a rotating shaft arranged therein for rotation, and includes a combined filter screen arranged in a circumferential array, which includes a curved portion and is divided into a second movable plate and a first movable plate opposite to a feed port by the curved portion. The automatic filling device for a pyrotechnic tablet press shunts pyrotechnic particles in an initial state through the arrangement of the combined filter screen, so that pyrotechnic particles with poor fluidity are retained in the second movable plate, and then heat is collected by the first movable plate in a folded state, so that the moisture in the pyrotechnic particles evaporates and the air content increases, thereby improving fluidity, and finally the bulging second movable plate is used to pour out the pyrotechnic particles after heat collection, and the dried pyrotechnic particles are cooled in combination with a cooling chamber to ensure production safety.

Description

Technical Field

[0001] The invention relates to the technical field of pyrotechnic powder manufacturing, in particular to an automatic filling device for a pyrotechnic powder tablet press. Background Art

[0002] The manufacturing process of pyrotechnics requires a series of mixing, pressing and adding processes, and finally compression molding through a tablet press. In this process, it is necessary to consider the material differences between pyrotechnic tablets and general powder tablets, and the flammable and moisture-sensitive properties of pyrotechnic particles.

[0003] In conjunction with publication number CN110207549B, publication date 2025-02-11, a fireworks propellant and powder mixing device is disclosed, including several mixing bins, each of which is connected in sequence; one end of the mixing bin is provided with a feed port, and the other end of the mixing bin is provided with a discharge port, the discharge port of the mixing bin at the upper level is detachably connected to the feed port of the adjacent lower-level mixing bin, and the mixing bin is provided with a mixing structure that can mix the fireworks propellant falling into the mixing bin from the feed port of the mixing bin.

[0004] However, in the prior art including the above patents, since the mixing bins are connected end to end and the transmission distance is long, ventilation is insufficient, so the pyrotechnic powder is very easy to be affected by moisture in the closed space, and the pyrotechnic powder particles with better fluidity are mixed with those with worse fluidity in the space connected end to end. Summary of the invention

[0005] The object of the present invention is to provide an automatic filling device for a pyrotechnic powder tablet press to solve the above-mentioned problems.

[0006] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: an automatic filling device for a pyrotechnic powder tablet press, comprising a spiral feeding barrel and a rotating shaft rotatably arranged therein, comprising a combined filter screen arranged in a circumferential array, which comprises a curved portion and is divided into a second movable plate and a first movable plate opposite to a feed port by the curved portion;

[0007] The end of the second movable plate reciprocates along the axial direction to switch between the concave state and the convex state, so that the pyrotechnic powder particles with poor fluidity can be introduced or poured out, and the first movable plate has a folded state during the movement of the second movable plate, and the folded state guides the hot air to the second movable plate;

[0008] It also includes a connecting part arranged between the two combined filter screens, the end of which is provided with a lever that abuts against the inner wall of the spiral feeding cylinder;

[0009] A drying chamber located at the lower end of the spiral feeding cylinder is provided with a heating port whose inner diameter decreases along the discharge direction of the pyrotechnic powder particles;

[0010] A cooling cavity is arranged around the discharge port of the heating port.

[0011] Preferably, the first movable plate and the second movable plate are both in an inclined step structure, and the inclination increases along the centripetal direction.

[0012] Preferably, a guide block for guiding the airflow into the cooling chamber is provided in the drying chamber, and a plurality of spiral blades are provided in a circumferential array in the cooling chamber.

[0013] Preferably, it also includes a circular ring for blocking the bent portion in the folded state, which is connected to the rotating shaft at a predetermined height and has a hot air hole.

[0014] Preferably, it also includes a transmission tube movably sleeved in the rotating shaft and fixedly connected to the second movable plate, which has a relatively set high position and a low position in sliding cooperation with the rotating shaft;

[0015] The transmission pipe is communicated with the drying chamber when the first movable plate is in the folded state.

[0016] Preferably, it further comprises a support member, a first end of which is radially slidably disposed on the bottom side of the second movable plate, and a shift rod is fixedly disposed on the second end of the support member and maintains a predetermined angle with the connecting portion.

[0017] Preferably, it also includes a rotating member that cooperates with the first movable plate to block and release.

[0018] Preferably, the device further comprises an intermittently opened cover plate which moves synchronously with the rotating member.

[0019] Preferably, it also includes a limiting groove for limiting the vertical movement of the connecting part, in which a sliding plate is arranged to keep synchronous movement with the rotating part.

[0020] Preferably, an upper filter screen and a lower filter screen which maintain a predetermined distance are arranged on the first movable plate, and the filter hole diameters of the upper filter screen and the lower filter screen are changed by tension.

[0021] In the above technical scheme, the automatic filling device of a pyrotechnic powder tablet press provided by the present invention has the following beneficial effects: by setting up the combined filter screen, the pyrotechnic powder particles are diverted in the initial state, so that the pyrotechnic powder particles with poor fluidity are retained in the second movable plate, and then the heat is gathered by the first movable plate in the folded state, so that the moisture in the pyrotechnic powder particles evaporates and the air content increases, thereby improving the fluidity, and finally the bulging second movable plate is used to pour out the pyrotechnic powder particles after the heat is gathered, and the dried pyrotechnic powder particles are cooled in combination with the cooling chamber to ensure production safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 An overall three-dimensional schematic diagram provided for an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of the structure of a spiral feeding barrel provided in an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the internal structure of a spiral feeding barrel provided in an embodiment of the present invention;

[0026] Figure 4 A schematic diagram of the internal structure of a spiral feeding barrel provided in an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the structure of a combined filter screen provided in an embodiment of the present invention;

[0028] Figure 6 A schematic diagram of the bottom structure of a combined filter screen provided in an embodiment of the present invention;

[0029] Figure 7 A schematic diagram of the structure of the connecting tough part and the supporting member provided in an embodiment of the present invention;

[0030] Figure 8 A schematic diagram of the structure of a first movable plate provided in an embodiment of the present invention;

[0031] Fig. 9 A schematic diagram of the structure of a second movable plate provided in an embodiment of the present invention;

[0032] Fig.10 A schematic diagram of the initial state of the combined filter provided by an embodiment of the present invention;

[0033] Fig.11 A schematic diagram of a folded state of a combined filter provided by an embodiment of the present invention;

[0034] Fig.12 A schematic diagram of the terminal state of the combined filter provided by an embodiment of the present invention;

[0035] Fig.13 The embodiment of the present invention provides Figure 4 A is a schematic diagram of the enlarged structure;

[0036] Fig.14 A schematic diagram of the internal structure of a rotating shaft provided in an embodiment of the present invention;

[0037] Fig.15 A schematic diagram of the connection structure of the rotating shaft, the transmission tube and the circular ring provided in an embodiment of the present invention;

[0038] Fig.16 A plan view and a three-dimensional view of the upper filter screen and the lower filter screen in the initial state provided by an embodiment of the present invention;

[0039] Fig.17 The plan view and three-dimensional view of the upper filter screen and the lower filter screen in the folded state provided by an embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 1. Screw feeding barrel; 11. Drying chamber; 12. Cooling chamber; 13. Exit; 14. Filling port; 15. Rotating shaft; 151. High position; 152. Low position; 153. Ring groove; 154. Air outlet; 155. Ring; 156. Block; 157. Hot air hole; 16. Transmission pipe; 17. Cover plate; 18. Transmission belt; 181. Inclined block; 19. Limiting groove; 2. Combined filter; 21. First movable plate; 211. Block; 212. First notch; 2 13. Second notch; 22. Bending portion; 23. Second movable plate; 231. Upper opening; 232. Lower opening; 24. Connecting tough portion; 241. Dovetail end; 25. Support member; 251. Push rod; 252. Extension block; 26. Block; 27. Elastic member; 28. Fixed rail; 3. Guide block; 4. Heating port; 5. Spiral blade; 6. Slide plate; 7. Rotating member; 71. Slot; 8. Upper filter screen; 9. Lower filter screen; 91. Warp block; 92. Movable port. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0043] like Figure 1-17 As shown, an automatic filling device for a pyrotechnic powder tablet press comprises a spiral feeding barrel 1 and a rotating shaft 15 rotatably arranged therein, and a combined filter screen 2 arranged in a circumferential array, such as Figure 5 As shown, it includes a curved portion 22 and is divided into a second movable plate 23 and a first movable plate 21 opposite to the feed port by the curved portion 22;

[0044] The end of the second movable plate 23 reciprocates along the axial direction to switch between the concave and convex states, so that the pyrotechnic powder particles with poor fluidity can be introduced or poured out. The first movable plate 21 has a folded state during the movement of the second movable plate 23, and the folded state guides the hot air to the second movable plate 23;

[0045] like Figure 7As shown, it also includes a connecting tough part 24 disposed between the two combined filter screens 2, and a lever 251 is disposed at the end thereof to abut against the inner wall of the spiral feeding cylinder 1;

[0046] A drying chamber 11 located at the lower end of the spiral feeding cylinder 1 is provided with a heating port 4 whose inner diameter decreases along the discharge direction of the pyrotechnic powder particles;

[0047] A cooling chamber 12 is arranged around the discharge port of the heating port 4 .

[0048] Specifically, the spiral feed barrel 1 is arranged vertically and is used to transmit the pyrotechnic powder particles produced by the granulator. The rotating shaft 15 is provided with an auger for propulsion. The combined filter screen 2 is arranged in the spiral feed barrel 1, and the filter holes of the first movable plate 21 are larger than the filter holes on the second movable plate 23. The pyrotechnic powder particles are screened by the combined filter screen 2 and enter the drying chamber 11, and are further dried in the heating port 4. The cooling chamber 12 dissipates the heat of the discharge of the heating port 4 through an air cooling or water cooling unit to prevent the pyrotechnic powder particles from being overheated and ignited, thereby ensuring on-site safety. The above technology is common knowledge known to those skilled in the art and will not be elaborated here.

[0049] Furthermore, the heating port 4 is coaxially sleeved in the drying chamber 11, and the cooling chamber 12 is fixedly arranged below the drying chamber 11, wherein the discharge port of the heating port 4 is in the shape of a pipe and is located in the middle of the cooling chamber 12, and after the discharge port of the heating port 4 passes through the cooling chamber 12, a filling port 14 is arranged at the end of the cooling chamber 12, and the pyrotechnic powder particles enter the tablet press through the filling port 14 to be made into pyrotechnic tablets. The tablet press speed range is 5~100rpm, and the tablet surface area is 30~200mm². This part of the process is the prior art, and reference can be made to the dry process manufacturing and generated pyrotechnic items disclosed in the publication number CN101198400A, which will not be described in detail here.

[0050] Furthermore, a plurality of combined filter screens 2 are enclosed to form a bucket-shaped structure, wherein the second movable plate 23 has a wide end fixedly connected to the bending portion 22 and an opposite narrow end. The "end of the second movable plate 23" mentioned above specifically refers to the narrow end, and the narrow end is arranged close to the rotating shaft 15. Through a driving unit such as a hydraulic rod or an electric telescopic rod, the narrow end of the second movable plate 23 is reciprocated along the axial direction, that is, it moves vertically up and down. In the initial state, the narrow end is driven downward by the driving unit and pulls the first movable plate 21 downward synchronously. At this time, the first movable plate 21 and the second movable plate 23 form a guiding plane inclined to the center of the circle. The edge of the first movable plate 21 is at a higher position due to the friction resistance of the inner wall of the spiral feeding barrel 1, and the first movable plate 21 is squeezed by the inner wall and shrinks in diameter, such as Fig.10The second movable plate 23 is in a concave state, and the vertical projection of the auger is covered by the first movable plate 21, so that the pyrotechnic powder particles pushed by the auger will automatically fall on the first movable plate 21, among which the pyrotechnic powder particles with good fluidity are light and do not agglomerate, and will stay and enter the drying chamber 11 below through the filter holes of the first movable plate 21. However, the pyrotechnic powder particles with poor fluidity due to uneven moisture or granulation will agglomerate and have a large weight, so they fall on the first movable plate 21 and roll along the guide surface at a faster speed, and will be preferentially introduced into the second movable plate 23 with smaller filter holes, and will be retained by the second movable plate 23 in a concave state.

[0051] like Fig.10 As shown in FIG. 1 , when the narrow end moves downward to the extreme position A, the first movable plate 21 is separated from the screw feeding barrel 1, and the edge of the first movable plate 21 abuts against the lower end of the screw feeding barrel 1. Then the driving unit drives the narrow end to rise to position B, as shown in FIG. Fig.11 As shown, at this time, the first movable plate 21 is blocked by the lower port and deflected to a folded state, and the pyrotechnic powder particles that remain on the surface of the first movable plate 21 due to their light weight are dumped to the edge, and the filter holes are shaken by the deflection action to prevent the particles from being blocked. At the same time, since the first movable plate 21 is folded to form a state of enclosing the second movable plate 23, and a heating unit such as a heating wire or a thermal resistor is arranged on the inner side of the heating port 4, the heat generated by the heating unit heats the air in the drying chamber 11, so that the hot air automatically rises to the first movable plate 21. At this time, the enclosed surface formed by the first movable plate 21 (the filter screen has an obstruction effect on the airflow due to the small filter holes) guides the hot air flow toward the second movable plate 23, which has a heat gathering effect, so that the pyrotechnic powder particles with poor fluidity in the second movable plate 23 are heated, so that the moisture evaporates and the air content is increased, thereby improving the fluidity.

[0052] The narrow end continues to move up to position C, which is the final state. Fig.12 As shown, due to the obstruction of the lower port to the first movable plate 21, the first movable plate 21 continues to stay at the lower port, and the second movable plate 23 is driven by the narrow end to deflect upward with the curved portion 22 as the axis, presenting a bulging state, and causing the first movable plate 21 to deflect and avoid the lower port, and the first movable plate 21 is in a reduced diameter state again. At this time, the second movable plate 23 is located at a higher position and forms a guide plane inclined toward the outer circumference of the circle with the first movable plate 21, so that the pyrotechnic powder particles after being heated are poured out and then enter the drying chamber 11 through the first movable plate 21. Then the narrow end drops from position C to position A again, driving the second movable plate 23 to switch from bulging to concave, and the edge of the first movable plate 21 is stopped by the resistance of the inner wall of the spiral feeding barrel 1, so that the first movable plate 21 swings with the second movable plate 23 to tilt toward the center of the circle, and the combined filter 2 is restored to its initial state as a whole.

[0053] In the above technology, by setting the combined filter screen 2, the pyrotechnic powder particles are diverted in the initial state, so that the pyrotechnic powder particles with poor fluidity are retained in the second movable plate 23, and then the first movable plate 21 in the folded state gathers heat, so that the moisture in the pyrotechnic powder particles evaporates and the air content increases, thereby improving the fluidity. Finally, the bulging second movable plate 23 is used to pour out the pyrotechnic powder particles after the heat is gathered, and the dried pyrotechnic powder particles are cooled in combination with the cooling chamber 12 to ensure production safety.

[0054] As an embodiment further provided by the present invention, the first movable plate 21 and the second movable plate 23 are both in an inclined step structure, and the inclination increases gradually along the centripetal direction.

[0055] Specifically, the cross-sectional shape of the second movable plate 23 is Fig. 9 As shown for reference, the overall structure of the first movable plate 21 is as follows Figure 8 As shown for reference. When the pyrotechnic powder particles fall on the first movable plate 21, the particles with better fluidity are lighter, have smaller acceleration on the inclined plane, and are slower; while the particles with poorer fluidity are heavier, have greater acceleration on the inclined plane, and pass through the first movable plate 21 quickly. The step structure can make the contact surface of the slower pyrotechnic powder particles larger, thereby extending the residence time and directly passing through the first movable plate 21, while the faster pyrotechnic powder particles will continue to accelerate at the gradually increasing slope and directly enter the second movable plate 23, further improving the screening efficiency.

[0056] Furthermore, the middle portion of the second movable plate 23 has a stepped structure, an upper opening 231 is provided at the protrusion of the stepped structure, and a lower opening 232 is provided at the outer edge of the narrow end of the second movable plate 23. When the narrow end of the second movable plate 23 moves upward, the second movable plate 23 is first bent along the lower opening 232, and then the protrusion is bent along the upper opening 231, and at this time the narrow end bulges upward.

[0057] A stopper 211 is rotatably provided at the edge of the first movable plate 21, and is in a Z shape, wherein a first notch 212 and a second notch 213 are respectively provided at the inner angle (i.e., an angle less than 180°) of the Z shape. When the stopper 211 is blocked by the lower end of the spiral feeding barrel 1 and flips downward, the first movable plate 21 will swing from tilting toward the center of the circle to tilting toward the outer circumference of the circle, as shown in FIG. Figure 10 to Figure 11 The fulcrum of the swing is the stopper 211, and the first notch 212 and the second notch 213 provide a margin for the deformation during the swing process, making the swing smoother.

[0058] As another embodiment provided by the present invention, a guide block 3 for guiding the airflow into the cooling chamber 12 is arranged in the drying chamber 11, and a plurality of spiral blades 5 are arranged in a circumferential array in the cooling chamber 12.

[0059] Specifically, the heating port 4 heats the air in the drying chamber 11 through the heating unit, so that the hot air rises and dries the pyrotechnic powder particles in the combined filter 2, while the colder air in the drying chamber 11 close to the outside will automatically fall and stay in the annular space formed by the outer wall of the heating port 4 and the inner wall of the drying chamber 11. Since the inner diameter width of the annular space decreases gradually, the cold air passes through the annular space from top to bottom at a faster speed, and forms a low-pressure area at the upper port of the cooling chamber 12 through the speed difference. Part of the rising hot air flow will be guided by the guide block 3 and flow toward the annular space. When the hot and cold air flows meet, the water vapor contained in the hot air flow is cooled and liquefied and condensed in the annular space, and then enters the cooling chamber 12 under the action of gravity and is discharged.

[0060] When the hot air flow reaches the upper port of the cooling chamber 12 , it naturally flows to the low-pressure area, so that the hot air flow drives the cold air to automatically flow into the cooling chamber 12 , and during the contact process, the temperature of the hot air flow drops and naturally flows downward along the spiral blade 5 .

[0061] The cold air flow is further accelerated along the spiral blade 5 and discharged at the outlet 13 provided on the cooling chamber 12, so that the air flow velocity formed in the drying chamber 11 and the cooling chamber 12 is accelerated, the cooling efficiency of the cooling chamber 12 is improved, and the pyrotechnic powder particles in the discharge port of the heating port 4 are cooled, which can avoid the safety problems caused by the overheating of the pyrotechnic powder particles and shrink the air in the pyrotechnic powder particles to reduce the air content of the pyrotechnic powder particles during the filling process, so that the tablet press is less disturbed by air during the compression process of the particles, and the final tablet density is greater than or equal to 90% of the theoretical density.

[0062] As another embodiment provided by the present invention, it also includes a ring 155 for blocking the bent portion 22 in the folded state, which is connected to the rotating shaft 15 at a predetermined height, and a hot air hole 157 is opened on the ring 155.

[0063] Specifically, Figure 14 to Figure 15As shown, a plurality of air outlets 154 are provided on the rotating shaft 15, and a stopper 156 is slidably provided on the rotating shaft 15, the stopper 156 and the circular ring 155 are fixedly connected via an L-shaped connecting pipe, and a serrated structure is provided at the bottom end of the circular ring 155, the rotating shaft 15 is connected to a heat supply unit, and the heat supply unit may be an externally connected hot air supply mechanism or an electric heating wire provided in the rotating shaft 15. When the ring 155 is not in contact with the curved portion 22, the stopper 156 is driven by the deadweight of the ring 155 to stay at the lower part of the rotating shaft 15. At this time, the stopper 156 overlaps and blocks the air outlet 154. As the first movable plate 21 swings to the folded state, the curved portion 22 bulges and abuts against the ring 155. The ring 155 drives the stopper 156 to move up to the limit position and then stops. At this time, the stopper 156 is staggered from the air outlet 154, so that the air outlet 154 is connected to the L-shaped connecting pipe. At this time, the hot air flow in the rotating shaft 15 flows outward along the hot air hole 157. The hot air flow is separated by the curved portion 22 and flows along the two sides of the curved portion 22 to the inner sides of the first movable plate 21 and the second movable plate 23 respectively. The blockage of the filter holes is reduced by the blowing of the air flow, and the drying effect is improved.

[0064] As another embodiment provided by the present invention, it also includes a transmission tube 16 which is movably sleeved in the rotating shaft 15 and fixedly connected to the second movable plate 23, and has a relatively arranged high position 151 and a low position 152 in sliding cooperation with the rotating shaft 15;

[0065] The transmission pipe 16 is communicated with the drying chamber 11 when the first movable plate 21 is in the folded state.

[0066] Specifically, an annular groove 153 is formed inside the rotating shaft 15, wherein the high position 151 and the low position 152 correspond to the highest point and the lowest point of the annular groove 153 respectively, and the highest point and the lowest point of the annular groove 153 are connected through a vertical groove, such as Fig.14 The transmission tube 16 is provided with a protrusion that slides with the annular groove 153. When the rotating shaft 15 rotates, the protrusion slides along the annular groove 153. In the initial state, the protrusion is located at the low position 152. At this time, the transmission tube 16 is at the lowest height and drives the narrow end of the second movable plate 23 to be located at position A. Fig.10 Then the rotating shaft 15 continues to rotate and causes the protruding block to move to the high position 151, the transmission tube 16 gradually moves upward and drives the narrow end of the second movable plate 23 to be located at position B, as shown in FIG. Fig.11 When the raised block reaches the high position 151, the transmission tube 16 moves up to the highest position and drives the narrow end of the second movable plate 23 to be located at position C, as shown in FIG. Fig.12 As shown, the raised block then falls down along the vertical slot under the gravity of the transmission tube 16 and returns to the low position 152, so that the second movable plate 23 returns to the initial state. The second movable plate 23 is driven to rotate by the rotating shaft 15, reducing the driving source and saving the overall cost.

[0067] Furthermore, the transmission tube 16 is a hollow structure connected to the rotating shaft 15 and a plug 26 is provided on the port thereof, and an elastic member 27 is provided on the plug 26 for making the plug 26 close to the port of the transmission tube 16. Fig.11 As shown, when the second movable plate 23 reaches position B, it is in a folded state. At this time, a trigger switch can be set at position B or an infrared detection device can be used to detect the height of the transmission tube 16, and then an electrical signal can be transmitted to the motor or telescopic rod, and the plug 26 can be staggered from the port by the motor drive or the telescopic rod push, or other triggering methods known to those skilled in the art can be used. When the second movable plate 23 is in the folded state, the plug 26 is staggered from the port, and the hot air flow in the drying chamber 11 enters the transmission tube 16, and the hot air flow is sent into the ring 155 through the rotating shaft 15.

[0068] As another embodiment provided by the present invention, it also includes a support member 25, a first end of which is radially slidably disposed on the bottom side of the second movable plate 23, and a lever 251 is fixedly disposed on the second end of the support member 25 and maintains a predetermined angle with the connecting tough portion 24.

[0069] Specifically, the connecting tough part 24 has good ductility in the width direction to provide a telescopic margin when the first movable plate 21 and the second movable plate 23 are switched. Compared with the method of directly welding two combined filter screens 2, the connecting tough part 24 is less likely to produce concentrated stress, reduce physical fatigue, and can be deformed multiple times. The end of the connecting tough part 24 close to the inner wall of the spiral feeding barrel 1 is provided with a dovetail end 241, so that the vertical projection of the connecting tough part 24 is close to a V-shaped structure, which increases the amount of movement in the width direction, and the dovetail end 241 extends out of the first movable plate 21 and is fixedly connected to the stop block 211.

[0070] Furthermore, a fixed rail 28 is arranged in a circumferential array on the bottom side of the second movable plate 23, a lever 251 is rotatably arranged in the dovetail end 241 and is maintained at a predetermined angle under the pulling of the support member 25, the support member 25 is elastic and the end thereof is slidably arranged in the fixed rail 28, an extension block 252 is arranged at the end of the support member 25 and drives the extension block 252 to move in the radial direction. When the first movable plate 21 and the second movable plate 23 directly form a guide surface, the dovetail end 241 is at the farthest distance from the axis, so that the support member 25 is pulled, and at this time the extension block 252 is away from the plug 26.

[0071] When the first movable plate 21 is in the folded state, the dovetail end 241 is closest to the axis, the support member 25 is bent and has a tendency to spread out to both sides, and the lever 251 is squeezed by the support member 25 and deflected upward, such as Fig.11In the state shown, the angle between the lever 251 and the block 211 increases because the block 211 is blocked and folded downward. At the same time, the extension block 252 is also squeezed by the support member 25 and slides along the fixed rail 28 and approaches the plug 26. The plug 26 overcomes the elastic force of the elastic member 27 through the pressure of the extension block 252 on the side slope of the plug 26. The plug 26 is staggered from the transmission tube 16, and the hot air flow in the drying chamber 11 enters the transmission tube 16, so that the plug 26 can be opened automatically without the need for other driving structures to cooperate.

[0072] As another embodiment provided by the present invention, it also includes a rotating member 7 that cooperates with the first movable plate 21 to block and release.

[0073] Specifically, the rotating member 7 is rotatably arranged at the lower port of the spiral feeding barrel 1, and the upper side of the rotating member 7 is an inclined surface, and a slot 71 is provided on the opposite lower side. When the first movable plate 21 moves downward in the initial state, the dovetail end 241 is guided by the inclined surface and slightly swings to avoid, and the first movable plate 21 moves to the lower side of the rotating member 7, and then the first movable plate 21 moves upward, and the dovetail end 241 is stuck in the slot 71, so that the dovetail end 241 is blocked by the rotating member 7 and deflected, and the stop block 211 deflects synchronously with the dovetail end 241, driving the first movable plate 21 to flip downward and reach the folded state. The rotating member 7 swings upward with the dovetail end 241, and when it reaches a certain angle, the dovetail end 241 is disengaged from the slot 71, and the first movable plate 21 continues to move upward and drives the dovetail end 241 to stagger with the rotating member 7. The rotating member 7 is no longer blocked by the dovetail end 241 and recovers under the action of its own weight. At this time, the inclined surface of the rotating member 7 is approximately perpendicular to the deflected dovetail end 241. Figures 10 to 12 When the narrow end drops from position C to position A, the second movable plate 23 is driven to switch from bulging to concave, and the dovetail end 241 is stopped by the resistance of the rotating member 7, so that the first movable plate 21 swings with the second movable plate 23 to tilt toward the center of the circle, and the combined filter 2 is restored to its initial state as a whole.

[0074] As another embodiment provided by the present invention, it also includes an intermittently opened cover plate 17 which moves synchronously with the rotating member 7.

[0075] Specifically, the cover plate 17 is semicircular and used to block the auger discharge port, and the cover plate 17 is rotatably arranged in the spiral feeding barrel 1 through a rotating shaft, and the rotating shaft and the rotating member 7 are connected by a transmission belt 18. Fig.13 and Figure 4For reference, when the rotating member 7 is blocked by the dovetail end 241 and deflects clockwise, it drives the cover plate 17 to deflect clockwise, from vertical to horizontal, and the two cover plates 17 enclose a closed surface to prevent the pyrotechnic powder particles in the spiral feeding barrel 1 from falling when the first movable plate 21 is folded, and the dovetail end 241 abuts against the rotating member 7 to keep the cover plate 17 in the current state. Until the narrow end drops from position C to position A again, the dovetail end 241 stays due to the resistance of the rotating member 7, and the combined filter screen 2 returns to the initial state. At this time, the dovetail end 241 falls and no longer presses the rotating member 7. The rotating member 7 swings counterclockwise and drives the cover plate 17 to open. At this time, the pyrotechnic powder particles can be screened through the combined filter screen 2, and intermittent discharge can prevent the pyrotechnic powder particles from having a bridging effect due to excessive quantity.

[0076] As another embodiment provided by the present invention, it also includes a limiting groove 19 for limiting the vertical movement of the connecting tough part 24, and a sliding plate 6 that keeps synchronous movement with the rotating member 7 is arranged in the limiting groove 19.

[0077] Specifically, the dovetail end 241 is located in the limiting groove 19 and moves up and down along the limiting groove 19, so that the combined filter screen 2 as a whole is limited by the limiting groove 19 and moves vertically. The slide plate 6 slides radially in the limiting groove 19, and the tension spring provided on the slide plate 6 makes the slide plate 6 close to the inner wall of the limiting groove 19 to avoid affecting the normal sliding of the dovetail end 241. The transmission belt 18 is fixedly provided with an inclined block 181 for pushing the slide plate 6. When the rotating member 7 is blocked by the dovetail end 241 and deflected clockwise, the inclined block 181 is pulled upward by the transmission belt 18, as shown in FIG. Fig.13 As shown, at this time, the slide plate 6 is squeezed by the inclined block 181 to extend toward the axis, and the dovetail end 241 is squeezed out of the limiting groove 19.

[0078] As the rotating shaft 15 continues to rotate, the limiting groove 19 no longer restricts the dovetail end 241 from moving in the vertical direction, so that the transmission tube 16 is simultaneously subjected to the upward force of the annular groove 153 and the rotational force of the rotating shaft 15, and the transmission tube 16 rotates and rises. Since the first movable plate 21 is in a folded state at this time, the dovetail end 241 is closest to the axis, the support member 25 is bent and has a tendency to expand to both sides, and the lever 251 is squeezed by the support member 25 and deflected upward, as shown in FIG. Fig.11 Because the stop block 211 is blocked and folded downward, the angle between the lever 251 and the stop block 211 increases, that is, the angle between the lever 251 and the dovetail end 241 increases, and the corrugated plate fixed at the end of the lever 251 is blocked by the dovetail end 241 and deflected and pressed against the inner wall of the spiral feeding barrel 1. The lever 251 is driven by the rotation of the transmission tube 16 to scrape the inner wall of the spiral feeding barrel 1, thereby playing a cleaning role.

[0079] As another embodiment provided by the present invention, an upper filter screen 8 and a lower filter screen 9 are provided on the first movable plate 21 with a predetermined spacing, and the filter hole diameters of the upper filter screen 8 and the lower filter screen 9 are changed by tension.

[0080] Specifically, the upper filter 8 and the lower filter 9 are respectively arranged on the inner side and the outer side of the first movable plate 21. Figure 8 As shown for reference, the ends of the upper filter screen 8 and the lower filter screen 9 are fixedly connected to the stop block 211, and the upper filter screen 8 and the lower filter screen 9 are both wefts, and a warp block 91 as a warp is fixedly provided on the lower filter screen 9, and a movable opening 92 for the upper filter screen 8 to pass through is opened on the warp block 91, as shown in FIG. Fig.16 and Fig.17 In the initial state, the upper filter screen 8 and the lower filter screen 9 are both in a relaxed state, and the distance between them is the largest. The upper filter screen 8 is located at the upper end of the movable opening 92, so that the entire warp block 91 is as shown. Fig.16 The three-dimensional figure shows the lodging state, at this time, the filter screen composed of the upper filter screen 8, the lower filter screen 9, and the warp block 91 is Fig.16 The plan view structure shown has larger filter holes, allowing lighter and more fluid gunpowder particles to pass through quickly.

[0081] The dovetail end 241 is blocked by the rotating member 7 and deflected, and the stop block 211 deflects downward synchronously with the dovetail end 241, so that the upper filter screen 8 and the lower filter screen 9 are both tensioned and stretched, and the spacing is shortened. The upper filter screen 8 moves to the middle end of the movable opening 92, and the warp block 91 is supported by the upper filter screen 8 and stands upright, which is used to reduce the speed of the fireworks powder particles poured after heat accumulation and fully screen them, and the filter screen composed of the upper filter screen 8, the lower filter screen 9, and the warp block 91 is Fig.17 In the plan view structure shown, the filter holes are reduced to prevent insufficiently dried gunpowder particles from falling.

[0082] 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 filling device for a pyrotechnic powder tablet press, comprising a spiral feeding cylinder (1) and a rotating shaft (15) rotatably arranged therein, characterized in that: It comprises a combined filter screen (2) arranged in a circular array, comprising a curved portion (22) and divided by the curved portion (22) into a second movable plate (23) and a first movable plate (21) opposite to a feed inlet; The end of the second movable plate (23) reciprocates along the axial direction to switch between the concave and convex states, so that pyrotechnic powder particles with poor fluidity can be introduced or poured out, and the first movable plate (21) has a folded state during the movement of the second movable plate (21), and the folded state guides hot air to the second movable plate (23); It also includes a connecting tough portion (24) disposed between the two combined filter screens (2), the end of which is provided with a lever (251) that abuts against the inner wall of the spiral feeding cylinder (1); A drying chamber (11) located at the lower end of the spiral feeding cylinder (1), wherein a heating port (4) is provided, the inner diameter of which decreases along the discharge direction of the pyrotechnic powder particles; A cooling chamber (12) arranged around the discharge port of the heating port (4); It also includes a circular ring (155) for blocking the bent portion (22) in a folded state, which is connected to the rotating shaft (15) at a predetermined height, and a hot air hole (157) is provided on the circular ring (155); It also includes a transmission tube (16) movably sleeved in the rotating shaft (15) and fixedly connected to the second movable plate (23), and having a relatively arranged high position (151) and a low position (152) in sliding cooperation with the rotating shaft (15); The transmission pipe (16) is in communication with the drying chamber (11) when the first movable plate (21) is in a folded state.

2. The automatic filling device for a pyrotechnic powder tablet press according to claim 1, characterized in that: The first movable plate (21) and the second movable plate (23) are both in an inclined step structure, and the inclination increases gradually in the centripetal direction.

3. The automatic filling device for a pyrotechnic powder tablet press according to claim 1, characterized in that: A guide block (3) for guiding airflow into the cooling chamber (12) is arranged in the drying chamber (11), and a plurality of spiral blades (5) are arranged in a circumferential array in the cooling chamber (12).

4. The automatic filling device for a pyrotechnic powder tablet press according to claim 1, characterized in that: It also includes a support member (25), a first end of which is radially slidably disposed on the bottom side of the second movable plate (23), and a shifting rod (251) is fixedly disposed on the second end of the support member (25) and maintains a predetermined angle with the connecting tough portion (24).

5. The automatic filling device for a pyrotechnic powder tablet press according to claim 1, characterized in that: It also includes a rotating member (7) that cooperates with the first movable plate (21) to block and disassemble.

6. The automatic filling device for a pyrotechnic powder tablet press according to claim 5, characterized in that: It also includes an intermittently opened cover plate (17) which moves synchronously with the rotating member (7).

7. The automatic filling device for a pyrotechnic powder tablet press according to claim 5, characterized in that: It also includes a limiting groove (19) for limiting the vertical movement of the connecting tough part (24), in which a sliding plate (6) is arranged to keep synchronous movement with the rotating member (7).

8. The automatic filling device for a pyrotechnic powder tablet press according to claim 1, characterized in that: An upper filter screen (8) and a lower filter screen (9) are provided on the first movable plate (21) with a predetermined spacing, and the filter hole diameters of the upper filter screen (8) and the lower filter screen (9) are changed by tension.

Images