A new rotary dry powder packing machine

By using an inverted conical funnel structure and combined mechanical design, the problem of poor material discharge from the cement packaging machine's hopper was solved, achieving uniform distribution and smooth discharge of cement, thus improving discharge efficiency and equipment lifespan.

CN115214911BActive Publication Date: 2026-03-27FOSHAN JUNGUANG MASCH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-07-06
Publication Date
2026-03-27

AI Technical Summary

Technical Problem

The existing cement packaging machine has problems with material discharge from the hopper, which is prone to blockage. The flexible shaft has a small agitation range and cannot effectively agitate the cement, resulting in poor discharge performance.

Method used

The material cylinder adopts an inverted conical funnel structure, combined with components such as an air pump, air storage tank, servo motor, filter element, sleeve, ejector block, and stirring rod. Through gas pressure agitation and mechanical stirring, it achieves uniform distribution and smooth discharge of cement.

Benefits of technology

It effectively reduces the moisture content in the barrel, reduces wear, ensures smooth discharge, uniform cement distribution, prevents leakage, extends the life of the sealing mechanism, and improves discharge efficiency.

✦ Generated by Eureka AI based on patent content.

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Patent Text Reader

Abstract

The application provides a novel rotary dry powder packaging machine, which comprises an air inlet box, an opening is arranged at the top of the air inlet box, a filter element is attached to the upper inside of the air inlet box, the filter element is composed of non-woven fabric wrapped activated carbon particles, and the air inlet box is connected with the air inlet end of an air pump through a pipeline; the air inlet box and the filter element are used to filter the air entering the air pump and the air cylinder, the combination of activated carbon and non-woven fabric is used to remove impurities in the filtered air and reduce the moisture in the air, so that the drying and purifying effects are achieved, the water vapor content in the air cylinder is effectively reduced, the cement clumps in the air cylinder are prevented, and the abrasion of the sealing mechanisms such as the air pump, the air cylinder and the piston is reduced, and the application is particularly suitable for cement production.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of packaging equipment, in particular to a novel rotary dry powder packaging machine. BACKGROUND

[0002] Cement is a kind of inorganic gel material in powder form, in order to facilitate transportation, cement needs to be packaged, and the cement bin has large capacity, the discharge is difficult to control and is prone to blockage;

[0003] The cement bin of the cement packaging machine is continuously modified, for example, the environmental protection type cement packaging machine with application number CN201910936732.4 adopts a series of structures such as air pump, driving mechanism, pawl and ratchet wheel, which can impact the cement in the cement chute, avoid the cement chute from being blocked, and achieve the effect of facilitating discharge;

[0004] The soft shaft can only stir the cement in the cement chute from a local part, and the working range of the soft shaft is small in actual use, and the cement cannot be stirred from multiple angles, so that the discharge is not smooth, and the discharge effect is poor. SUMMARY

[0005] To solve the above technical problems, the present application provides a novel rotary dry powder packaging machine to solve the problems described in the background art.

[0006] The purpose and effect of the novel rotary dry powder packaging machine are achieved by the following specific technical means: a material cylinder is provided, the material cylinder is an inverted conical hopper structure, an air pump is fixedly installed below the back of the material cylinder, the air outlet of the air pump is arranged on the back side of the material cylinder, a controller is installed on the front of the material cylinder, a gas storage cylinder is fixedly connected to the top of the material cylinder, the gas storage cylinder is a rectangular box structure, a support plate is welded to the upper position of the back of the gas storage cylinder, and a servo motor is assembled on the top of the support plate.

[0007] The novel rotary dry powder packaging machine further comprises: an air inlet box, an opening is arranged on the top of the air inlet box, a filter element is attached to the upper position inside the air inlet box, the filter element is composed of non-woven fabric wrapped activated carbon particles, and the air inlet box is connected in communication with the air inlet end of the air pump through a pipeline.

[0008] Further, the air outlet end of the air pump is connected in communication with a metal communication pipe, the communication pipe is arranged through the inner wall of the back side of the material cylinder, the other end of the communication pipe is connected with a sleeve, a ejection block is embedded on the top of the sleeve, a rubber sealing ring is sleeved on the bottom of the ejection block, and the sleeve and the ejection block are connected in sliding mode.

[0009] As a further aspect of the present invention: The sleeve is connected to the connecting pipe. A step is provided at the lower position of the inner wall of the sleeve, and the diameter of the step is smaller than the diameter of the ejecting block.

[0010] The connection position of the connecting pipe and the sleeve is located below the step.

[0011] The top of the ejecting block is of a conical structure.

[0012] As a further aspect of the present invention: The sleeve is vertically installed at the central axis position of the barrel. An obliquely upward through hole is provided on the outer side of the sleeve. A groove is provided on the outer side of the sleeve, and the groove is arranged parallel to the through hole. A filter screen is embedded in the groove.

[0013] The outer side of the filter screen is flush with the outer side of the sleeve. The filter screen is anchored to the sleeve as a whole by screws, and counterbored holes are provided on the filter screen.

[0014] As a further aspect of the present invention: The output end of the servo motor is fixedly connected with a flywheel. A connecting rod is rotationally connected to the front surface of the flywheel through a rotating shaft, and the connecting rod is eccentrically installed with respect to the flywheel.

[0015] The connecting rod penetrates through the upper end surface of the air storage cylinder. A piston is slidably connected inside the air storage cylinder, and the piston is rotationally connected to the connecting rod through a rotating shaft.

[0016] The air storage cylinder is connected to the air inlet box through a check valve, and the air inlet end of the air pump is connected to the air storage cylinder.

[0017] As a further aspect of the present invention: A pull rod is rotationally connected to the bottom of the piston. The pull rod is in a "T" shape. A cross bar is fixedly connected to the bottom of the pull rod, and two stirring rods are fixedly connected to the bottom of the cross bar.

[0018] A guide block is fixedly connected to the inner bottom end of the air storage cylinder. The guide block is sleeved on the outer side of the pull rod. A spiral groove is provided on the outer side of the pull rod, and a protrusion is provided on the inner side of the guide block, and the protrusion is embedded in the groove on the outer side of the pull rod.

[0019] As a further aspect of the present invention: The stirring rod is in a "human" shape, and the distal end of the stirring rod is sharp.

[0020] The stirring rod on the left side of the bottom of the cross bar is installed at its end, and the stirring rod on the right side of the bottom of the cross bar is installed at its lower right.

[0021] As a further aspect of the present invention: A vertical rod is installed on the front surface of the connecting rod. A spring is fixedly connected to the lower position on the front surface of the vertical rod, and a striking block is fixedly connected to the bottom of the spring.

[0022] As further of the present application: the inner wall of the barrel is fitted with air bag one in the middle position, the air bag one is two and arranged in parallel up and down;

[0023] The air bag one is embedded in the inner wall of the barrel, and the inner circle of the air bag one is flush with the barrel;

[0024] The air bag one is communicated with the air outlet end of the air pump through the air pipe one, and the electromagnetic valve is assembled on the air pipe one.

[0025] As further of the present application: the inner wall of the barrel is fitted with air bag one in the middle position, the air bag one is two and arranged in parallel up and down;

[0026] The air bag two is fixed with a protrusion on the outer side, and one end of the protrusion is clamped on the inner wall of the discharge port of the barrel.

[0027] Beneficial effects:

[0028] 1. The air entering the air pump and the air cylinder is filtered by the air inlet box and the filter element, the impurities in the filtered air are filtered by the combination of activated carbon and non-woven fabric, and the moisture in the air is reduced, so that the effects of drying and purification are achieved, the water vapor content in the barrel is effectively reduced, the cement clumps in the barrel are prevented, and the wear of the sealing mechanism of the air pump, the air cylinder and the piston is reduced, which is especially suitable for cement production.

[0029] 2. The sleeve, the ejection block and the filter screen are designed, the pressure generated by the gas pushes the ejection block upwards to extrude the cement on the axis in the bunker, so that the effect of stirring the cement is achieved, the air outlet holes are arranged on the side surface of the sleeve, the cement is impacted by the gas, the effect of loosening the cement is achieved, and the discharge of the barrel is effectively ensured.

[0030] 3. The flywheel and the connecting rod are designed, the flywheel and the connecting rod drive the piston to move up and down, the flywheel and the connecting rod are hinged with the piston, the action of the piston is more accurate, the connection is more stable and reliable, the impact force is greatly reduced, the service life of the piston is effectively ensured, and the operation of the whole system is more reliable.

[0031] 4. The design of the pull rod and the stirring rod is adopted, the up and down movement of the pull rod is guided by the guide block, the pull rod rotates to drive the stirring rod to rotate, and the stirring rod also keeps up and down movement and rotates around its own axis to stir the cement, which achieves the effect of stirring the cement well, makes the discharge of the cement more smooth, and the distribution of the cement in the barrel is more uniform.

[0032] 5. The present application adopts the design that the air bag one is attached to the inner wall of the barrel, when the cement in the barrel flows out, the cement attached to the inner wall of the barrel falls under the extrusion of the air bag one, and the cement is uniformly distributed under the extrusion of the air bag one, which is convenient for the discharge of the barrel.

[0033] 6. The present application adopts the design of the air bag two, which controls the speed of the cement flowing through the discharge port of the barrel, and can realize the effect of closing the discharge port of the barrel, preventing leakage of the barrel and controlling the flow of the cement discharged from the barrel. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0035] Figure 2 It is a schematic diagram of the cross-sectional structure of the present application.

[0036] Figure 3 It is a right view of the overall structure of the present application.

[0037] Figure 4 It is a schematic diagram of the cross-sectional structure of the air inlet tank of the present application.

[0038] Figure 5 It is a schematic diagram of the local structure of the sleeve of the present application.

[0039] Figure 6 It is a schematic diagram of the local structure of the air bag two of the present application.

[0040] Figure 7 It is a schematic diagram of the local structure of the air bag two of the present application. Figure 2 It is a schematic diagram of the local structure of the air bag two of the present application.

[0041] Figure 8 It is a schematic diagram of the cross-sectional structure of the present application. Figure 5 It is a schematic diagram of the cross-sectional structure of the present application.

[0042] Figure 9 It is a schematic diagram of the local structure of the air bag two of the present application. Figure 3 It is a schematic diagram of the local structure of the air bag two of the present application.

[0043] Figures 1-9 In the present application, the correspondence between the component names and the figure numbers is as follows:

[0044] Barrel 1, air pump 101, communication pipe 102, controller 103, air bag one 104, air pipe one 105, air bag two 106, air pipe two 107, air cylinder 2, support plate 201, servo motor 202, flywheel 203, connecting rod 204, piston 205, pull rod 206, cross bar 207, stirring rod 208, guide block 209, vertical rod 210, spring 211, hitting block 212, air inlet tank 3, filter element 301, sleeve 4, ejection block 401, filter screen 402. DETAILED DESCRIPTION

[0045] As shown in the accompanying Figure 1 to the accompanying Figure 9 drawings:

[0046] Embodiment 1:

[0047] A new rotary dry powder packaging machine, comprising a barrel 1, the barrel 1 is an inverted conical hopper structure, the back of the barrel 1 is fixedly installed with an air pump 101, the air outlet of the air pump 101 is arranged on the back side of the barrel 1, the front of the barrel 1 is installed with a controller 103, the top of the barrel 1 is fixedly connected with a gas storage cylinder 2, the gas storage cylinder 2 is a rectangular box structure, a support plate 201 is welded on the top of the back of the gas storage cylinder 2, and a servo motor 202 is assembled on the top of the support plate 201;

[0048] The new rotary dry powder packaging machine further comprises: an air inlet box 3, the top of the air inlet box 3 is provided with an opening, and a filter element 301 is attached to the upper part of the inside of the air inlet box 3, the filter element 301 is composed of non-woven fabric wrapped activated carbon particles, and the air inlet box 3 is connected in communication with the air inlet end of the air pump 101 through a pipeline;

[0049] The air pump 101 inhales air from the inside of the air inlet box 3, so that a negative pressure is generated in the air inlet box 3, so that the air inlet box 3 inhales air from the opening at the top of the air inlet box 3, and the air enters the air pump 101 after passing through the filter element 301, the activated carbon particles in the filter element 301 are used to screen the air, filter impurities and moisture in the air, achieve the effect of drying and purifying, so that the air pump 101 is not easy to wear, and the air pump 101 can send air into the barrel 1 to impact the barrel 1, so that the air flows along the gaps of the cement in the barrel 1, and the effect of stirring the cement is achieved;

[0050] Wherein: the non-woven fabric wrapped activated carbon particles can effectively limit the activated carbon particles, ensure the gap between the activated carbon particles, guarantee the filtering effect, and prevent the activated carbon particles from entering the air pump 101;

[0051] Embodiment 2:

[0052] The difference between this embodiment and embodiment 1 is that the air outlet end of the air pump 101 is communicated with a metal communication pipe 102, the communication pipe 102 penetrates through the inner wall of the back side of the barrel 1, and the other end of the communication pipe 102 is connected with a sleeve 4, the top of the sleeve 4 is embedded with an ejection block 401, the bottom of the ejection block 401 is sleeved with a rubber sealing ring, and the sleeve 4 and the ejection block 401 are slidingly connected;

[0053] When the air pump 101 works, the gas source is continuously sent into the sleeve 4 through the communication pipe 102, as the pressure in the sleeve 4 continuously rises, the gas does work to push the ejection block 401 to go up, the cement in the barrel 1 is conducted, and the effect of stirring the cement is achieved;

[0054] The sleeve 4 is communicated with the communication pipe 102, and a step is arranged at a lower position of the inner wall of the sleeve 4, and the diameter of the step is smaller than that of the ejection block 401;

[0055] The connecting position of the communication pipe 102 and the sleeve 4 is arranged below the step;

[0056] The top of the ejection block 401 is in a conical structure;

[0057] The ejection block 401 is limited by the sleeve 4, so that the ejection block 401 cannot descend to the bottom of the sleeve 4 and block the communication pipe 102, the top of the ejection block 401 is sharp, and the ejection block 401 can extrude the cement when ascending, so that the ejection block 401 can move upward more easily, and the ejection block 401 has a good stirring effect;

[0058] The sleeve 4 is vertically arranged at the central axis of the barrel 1, a through hole is arranged on the outer side of the sleeve 4 and inclined upward, a groove is arranged on the outer side of the sleeve 4 and parallel to the through hole, and a filter screen 402 is arranged in the groove;

[0059] The outer side of the filter screen 402 is flush with the outer side of the sleeve 4, the filter screen 402 is anchored to the sleeve 4 by screws, and a countersunk hole is arranged on the filter screen 402;

[0060] The ejection block 401 is arranged at the central axis of the barrel 1 and reciprocates, so that the ejection block 401 has a good effect of dredging the cement raw material, when the lower end surface of the ejection block 401 is higher than the through hole on the outer side of the sleeve 4, the gas in the sleeve 4 is released, the gas is instantaneously sprayed along the inclined through hole, and the cement is impacted, so that the cement is loosened;

[0061] The filter screen 402 is arranged to shield the cement, so that the cement cannot flow into the sleeve 4, the outer side of the filter screen 402 is flush with the outer side of the sleeve 4, the impact of the cement on the filter screen 402 is small, the screws for fixing the filter screen 402 cannot affect the flowability of the cement, and the flowability of the cement can be effectively ensured;

[0062] The output end of the servo motor 202 is fixedly connected with a flywheel 203, the front surface of the flywheel 203 is rotationally connected with a connecting rod 204 through a rotating shaft, and the connecting rod 204 is eccentrically arranged with the flywheel 203;

[0063] The connecting rod 204 penetrates through the upper end surface of the gas cylinder 2, and a piston 205 is slidably arranged in the gas cylinder 2 and rotationally connected with the connecting rod 204 through a rotating shaft;

[0064] The gas cylinder 2 is communicated with the air inlet box 3 through a one-way valve, and the air inlet end of the air pump 101 is communicated with the gas cylinder 2;

[0065] The servo motor 202 drives the flywheel 203 to rotate. The connecting rod 204 eccentrically installed with the flywheel 203 drives the piston 205 to reciprocate up and down along the air storage cylinder 2. When the piston 205 moves upward, a negative pressure is generated inside the air storage cylinder 2, sucking air from the inside of the intake box 3. The flywheel 203 continues to rotate, causing the connecting rod 204 to move downward, driving the piston 205 to move downward to compress the air inside the air storage cylinder 2 and send the air into the air pump 101, enabling the air to enter and compensate for the pressure of the air pump 101, making the operation of the entire system more secure;

[0066] The bottom of the piston 205 is rotatably connected to a pull rod 206. The pull rod 206 is "T"-shaped. The bottom of the pull rod 206 is fixedly connected to a cross bar 207. The bottom of the cross bar 207 is fixedly connected to two stirring rods 208;

[0067] The inner bottom end of the air storage cylinder 2 is fixedly connected to a guide block 209. The guide block 209 is sleeved on the outside of the pull rod 206. A spiral groove is provided on the outside of the pull rod 206. A protrusion is provided on the inner side of the guide block 209, and the protrusion is embedded in the groove on the outside of the pull rod 206;

[0068] When the piston 205 reciprocates up and down, it drives the pull rod 206 to move up and down. Under the guiding action of the guide block 209, the pull rod 206 rotates around its own axis, driving the stirring rod 208 to stir the cement in the material cylinder 1. At the same time, the pull rod 206 also makes a reciprocating up and down movement, and the stirring rod 208 can turn the cement up and down, achieving a good effect of stirring the cement;

[0069] The stirring rod 208 is in the shape of a "person". The distal end of the stirring rod 208 is sharp;

[0070] The stirring rod 208 at the left side of the bottom of the cross bar 207 is installed at its end, and the stirring rod 208 at the right side of the bottom of the cross bar 207 is installed at its lower right;

[0071] The bottom of the stirring rod 208 is provided with a fork, which can effectively expand the stirring range of the stirring rod 208. At the same time, the rotation radii of the two stirring rods 208 at the bottom of the cross bar 207 are different. This design expands the stirring area of the stirring rod 208, and the ejecting block 401 can stir the cement from the center, and the gas in the sleeve 4 impacts the cement, which can stir the cement comprehensively;

[0072] A vertical rod 210 is installed on the front of the connecting rod 204. A spring 211 is fixedly connected to the lower position on the front of the vertical rod 210. The bottom of the spring 211 is fixedly connected to a striking block 212;

[0073] With the up and down reciprocating movement of the connecting rod 204, the connecting rod 204 drives the vertical rod 210 to move up and down, and when the connecting rod 204 drives the spring 211 and the beating block 212 to move downward, the beating block 212 collides with the barrel 1, generating a vibration force to agitate the cement in the barrel 1, so that the cement in the barrel 1 is evenly distributed, facilitating the work of the stirring rod 208 and the ejection block 401;

[0074] And the spring 211 can effectively alleviate the impact of the beating block 212 on the vertical rod 210, ensuring the stable operation of the servo motor 202;

[0075] The inner wall of the barrel 1 is attached with an air bag 104 in the middle position, and the air bag 104 is two and arranged in parallel;

[0076] The air bag 104 is embedded in the inner wall of the barrel 1, and the inner circle of the air bag 104 is flush with the barrel 1;

[0077] The air bag 104 is connected in communication with the air outlet end of the air pump 101 through the air pipe 105, and the air pipe 105 is equipped with an electromagnetic valve;

[0078] The air pump 101 supplies air to the air bag 104, so that the air bag 104 expands, and the air bag 104 extrudes the cement from the edge of the barrel 1, avoiding the cement from being adsorbed on the inner wall of the barrel 1, so that the cement is evenly distributed in the barrel 1;

[0079] And the air bag 104 embedded in the inner wall of the barrel 1 can minimize the influence of the air bag 104 on the flowability of the cement;

[0080] The inner wall of the discharge port of the barrel 1 is embedded with an air bag 106, and the air bag 106 is connected in communication with the air pump 101 through the air pipe 107, and the air pipe 107 is equipped with an electromagnetic valve;

[0081] The air bag 106 is fixed with a protrusion on the outside, and one end of the protrusion is clamped on the inner wall of the discharge port of the barrel 1;

[0082] The air bag 106 is supplied with air by the air pump 101, and when the air bag 106 expands, the inner diameter of the air bag 106 continuously decreases, thereby achieving the effect of controlling the flow rate of the discharge port of the barrel 1, and being able to completely close the discharge port of the barrel 1, preventing the cement in the barrel 1 from leaking;

[0083] Among them: this scheme can adopt a three-way electromagnetic valve to realize the release of the gas in the air bag 104 and the air bag 106;

[0084] Among them, the air pump 101, the controller 103 and the servo motor 202 are provided with a power source matched therewith, the controller 103 and the air pump 101, the servo motor 202 establish a communication channel, and the controller 103 is used for intelligent control of the electronic elements of the device as a whole.

Claims

1. A novel rotary dry powder packaging machine, comprising a material cylinder (1), the material cylinder (1) is an inverted conical hopper structure, a gas pump (101) is fixedly installed below the back of the material cylinder (1), the gas outlet of the gas pump (101) is arranged on the back side of the material cylinder (1), a controller (103) is installed on the front of the material cylinder (1), a gas storage cylinder (2) is fixedly connected to the top of the material cylinder (1), the gas storage cylinder (2) is a rectangular box structure, a support plate (201) is welded on the top of the back of the gas storage cylinder (2), and a servo motor (202) is assembled on the top of the support plate (201). characterized in that The novel rotary dry powder packaging machine further comprises an air inlet box (3), the top of the air inlet box (3) is provided with an opening, a filter element (301) is attached to the upper inside of the air inlet box (3), the filter element (301) is composed of activated carbon particles wrapped in non-woven fabric, and the air inlet box (3) is connected in communication with the air inlet end of the gas pump (101) through a pipeline. The gas outlet end of the gas pump (101) is communicated with a metal communication pipe (102), the communication pipe (102) penetrates through the inner wall of the back side of the material cylinder (1), one end of the communication pipe (102) is connected with a sleeve (4), and the top of the sleeve (4) is embedded with an ejection block (401). A step is formed in the lower part of the inner wall of the sleeve (4), and the diameter of the step is smaller than that of the ejection block (401). The connection position of the communication pipe (102) and the sleeve (4) is located below the step. The top of the ejection block (401) is a conical structure. The sleeve (4) is vertically installed at the central axis position of the material cylinder (1), a through hole is formed in the outer side of the sleeve (4) and extends upward, a groove is formed in the outer side of the sleeve (4), the groove is parallel to the through hole, and a filter screen (402) is embedded in the groove. The outer side of the filter screen (402) is flush with the outer side of the sleeve (4).

2. The new rotary dry powder packing machine according to claim 1, characterized in that: The output end of the servo motor (202) is fixedly connected with a flywheel (203), the front of the flywheel (203) is rotationally connected with a connecting rod (204) through a rotating shaft, and the connecting rod (204) and the flywheel (203) are eccentrically installed. A piston (205) is slidably connected in the inside of the gas storage cylinder (2), and the piston (205) and the connecting rod (204) are rotationally connected through a rotating shaft.

3. The new rotary dry powder packing machine according to claim 2, characterized in that: A pull rod (206) is rotationally connected to the bottom of the piston (205), a horizontal rod (207) is fixedly connected to the bottom of the pull rod (206), and two stirring rods (208) are fixedly connected to the bottom of the horizontal rod (207). A guide block (209) is fixedly connected to the bottom end of the inside of the gas storage cylinder (2), the guide block (209) is sleeved on the outer side of the pull rod (206), a spiral groove is formed in the outer side of the pull rod (206), and a protrusion is formed on the inner side of the guide block (209).

4. The new rotary dry powder packing machine according to claim 3, characterized in that: The stirring rod (208) is in a "person” shape, and the distal end of the stirring rod (208) is pointed. The stirring rod (208) is installed at the end of the left bottom of the cross bar (207), and the stirring rod (208) is installed below the right bottom of the cross bar (207).

5. The novel rotary dry powder packing machine as claimed in claim 2, wherein: The vertical rod (210) is installed on the front of the connecting rod (204), the spring (211) is fixedly connected to the lower front of the vertical rod (210), and the bottom of the spring (211) is fixedly connected with the hitting block (212).

6. The novel rotary dry powder packing machine as claimed in claim 1, wherein: The inner wall of the barrel (1) is attached with the air bag (104) at the middle position, the air bag (104) is two and arranged in parallel in up and down directions. The air bag (104) is embedded in the inner wall of the barrel (1), and the inner ring of the air bag (104) is flush with the barrel (1).

7. The novel rotary dry powder packing machine as claimed in claim 1, wherein: The air bag (106) is embedded in the inner wall of the discharge port of the barrel (1). The air bag (106) is fixed with the protrusion on the outer side, and one end of the protrusion is clamped on the inner wall of the discharge port of the barrel (1).

Citation Information

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