Pneumatic powder filling machine

Abstract

The utility model relates to a pneumatic powder filling machine, and belongs to the field of powder filling. According to the technical scheme, the syringe comprises a cylindrical syringe body, a vent hole is formed in the middle of the rear end face of the syringe body, a cylindrical expansion air bag is arranged in the syringe body, the rear end of the expansion air bag is connected to a rear end cover of the syringe body, and the vent hole is communicated with the interior of the expansion air bag; the outer side face of the expansion air bag does not make contact with the side wall of the injection barrel, the expansion air bag moves from back to front in the injection barrel to push powder to move forwards when inflated and expanded, a material push plate at the front end of the expansion air bag moves from front to back in the injection barrel when an inner body of the expansion air bag is drawn out, and the vent hole is connected with an air blowing and exhausting device. The expansion air bag structure is adopted, so that the piston pushes powder to achieve powder conveying, and friction between the piston structure and the inner wall of the injection barrel can be avoided.

Description

Technical Field

[0001] This utility model relates to a pneumatic powder filling machine, belonging to the field of powder filling. Background Technology

[0002] Carbon black is a powdered material with small particles, low density, and free-flowing properties under normal conditions.

[0003] Currently, carbon black is typically packaged using pneumatic conveying combined with a screw conveyor. Pneumatic conveying involves mixing powder with the airflow, making gas filtration complex and costly. Screw conveying, on the other hand, presents challenges in metering due to the characteristics of the material.

[0004] Injection molding is a convenient filling and conveying equipment for powder materials. However, due to the small density of powder particles, leakage or even accumulation of material may occur at the injection piston position. Summary of the Invention

[0005] To address the aforementioned problems, this utility model provides a pneumatic powder filling machine that uses an injection method to solve the friction problem of the injection structure.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention relates to a pneumatic powder filling machine, comprising a cylindrical injection cylinder, a conical discharge cylinder at the front end of the injection cylinder, a conical discharge cylinder at the rear end connected to the injection cylinder, an opening at the front end of the conical discharge cylinder connected to a discharge pipe, a discharge valve on the discharge pipe, and a feed inlet at the front end of the side wall of the injection cylinder, the feed inlet connected to a feed pipe, a feed valve on the feed pipe.

[0008] It also includes an expansion airbag. The injection cylinder has a vent hole in the middle of the rear end face. An expansion airbag is set inside the injection cylinder. The expansion airbag is cylindrical. The rear end of the expansion airbag is connected to the rear end cover of the injection cylinder. The vent hole is connected to the inside of the expansion airbag. The outer side of the expansion airbag does not contact the side wall of the injection cylinder. When the expansion airbag is inflated, it moves from back to front in the injection cylinder to push the powder forward. When the expansion airbag is pulled out, the material pusher at the front end of the expansion airbag moves from front to back in the injection cylinder. The vent hole is connected to the blowing and suction devices.

[0009] According to the aforementioned pneumatic powder filling machine, the inflatable airbag is shaped like a bamboo joint.

[0010] According to the aforementioned pneumatic powder filling machine, the expansion airbag includes an outer protruding ring, an inner concave ring, a front fixed ring, and a rear fixed ring. The outer protruding ring and the inner concave ring are arranged at intervals. The front edge of the front protruding ring is fixed to the circumference of the material push plate, and the rear edge of the rear protruding ring is fixed to the rear end cover of the injection cylinder.

[0011] According to the aforementioned pneumatic powder filling machine, the front end of the expansion airbag is equipped with a material pusher plate. The material pusher plate is a rigid circular shape and maintains a distance from the inner wall of the injection cylinder, avoiding contact.

[0012] According to the pneumatic powder filling machine, the side wall of the injection cylinder is provided with an exhaust hole, which is connected to an air pipe. A control air valve is installed on the air pipe, and the other end of the air pipe is connected to the atmosphere.

[0013] According to the pneumatic powder filling machine, the vent is connected to an air pipe, which is connected to a bidirectional air pump or one end of a Y-shaped air pipe. Both ends of the Y-shaped air pipe are connected to an air blowing source or an air extraction pump.

[0014] This invention uses an inflatable airbag structure to realize the piston pushing the powder to achieve powder delivery, which can avoid friction between the piston structure and the inner wall of the injection cylinder. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a connection diagram of this utility model.

[0017] Figure 3 This is a sectional view of the present invention.

[0018] Figure reference numerals: 1 Injection cylinder, 2 Conical discharge cylinder, 3 Discharge pipe, 4 Discharge valve, 5 Feed pipe, 6 Feed valve, 7 Vent hole, 8 Expansion air bladder, 9 Material push plate, 10 Y-shaped air pipe, 11 Air blowing source, 12 Air extraction pump, 13 Exhaust hole. Detailed Implementation

[0019] The specific structure of this utility model will be further described below:

[0020] This utility model relates to a pneumatic powder filling machine, comprising a cylindrical injection cylinder 1, a conical discharge cylinder 2 at the front end of the injection cylinder 1, a conical discharge cylinder 2 connected to the rear end of the conical discharge cylinder 1, and an opening at the front end of the conical discharge cylinder 1 connected to a discharge pipe 3, on which a discharge valve 4 is installed. An inlet is located at the front end of the side wall of the injection cylinder 1, connected to an inlet pipe 5, on which a feed valve 6 is installed.

[0021] The device is equipped with an expansion air bladder 8 inside. A vent hole 7 is provided in the middle of the rear end face of the injection cylinder 1. The expansion air bladder 8 is cylindrical. The rear end of the expansion air bladder 8 is connected to the rear end cover of the injection cylinder 1, and the vent hole 7 is connected to the inside of the expansion air bladder 8. The outer side of the expansion air bladder 8 does not contact the side wall of the injection cylinder 1. When the expansion air bladder 8 is inflated, it moves from back to front in the injection cylinder 1 to push the powder forward. When the expansion air bladder 8 is pulled out, the material pusher plate 9 at the front end of the expansion air bladder 8 moves from front to back in the injection cylinder 1. The vent hole 7 is connected to the blowing and suction devices.

[0022] The inflation process of the inflatable airbag expands, which can push the powder out. This process controls the volume of the discharged material by controlling the expansion air intake, and the conveying accuracy is higher than that of pneumatic conveying or screw conveying.

[0023] The expansion airbag 8 of this invention is shaped like a bamboo joint. The expansion airbag 8 includes an outer protruding ring, an inner concave ring, a front fixing ring, and a rear fixing ring. The outer protruding ring and the inner concave ring are arranged alternately. The front edge of the front protruding ring is fixed to the circumference of the material push plate 9, and the rear edge of the rear protruding ring is fixed to the rear end cap of the injection cylinder 1. The bamboo-shaped expansion airbag can control the forward movement of the expansion airbag during expansion and the overall backward movement during contraction, avoiding excessive frictional contact between the airbag and the inner wall structure of the injection cylinder.

[0024] The inflatable airbag 8 has a material pusher plate 9 at its front end. The material pusher plate 9 is a rigid circular shape and is kept at a distance from the inner wall of the injection cylinder 1, without contacting it.

[0025] The syringe 1 has a vent hole in the middle of its side wall, which is connected to a high-pressure air pipe. A purge control valve is installed on the high-pressure air pipe, and the other end of the high-pressure air pipe is connected to a high-pressure air source. A vent hole 7 is connected to an air pipe, which is connected to a bidirectional air pump or one end of a Y-shaped air pipe 10. Both ends of the Y-shaped air pipe 10 are connected to a purge air source 11 or a suction air pump 12. The vent hole initially discharges internal air.

[0026] When the air tube is connected to a two-way air pump, it can simultaneously inflate and deflate the inflatable airbag. Alternatively, a Y-shaped air tube 10 can be used to connect to a suction air pump to deflate the airbag and to connect to an air source 11 to inflate it.

[0027] The process of using this device:

[0028] 1) When using it for the first time, the vent is opened and the air pump extracts the gas from the inflatable bladder, causing the inflatable bladder to shrink to its smallest size;

[0029] 2) Close the vent and open the feed valve to deliver material into the injection cylinder;

[0030] 3) Inflate the expansion bladder with air. As the expansion bladder expands, the discharge valve opens, and the material is filled through the discharge valve under the push of the expansion bladder.

[0031] 40. Once the expansion bladder has expanded to its maximum size, the discharge valve closes and the feed valve opens, while the expansion bladder contracts again by drawing air out.

[0032] By repeating steps 2)-4), continuous injection feeding and filling can be achieved.

Claims

1. A pneumatic powder filling machine, comprising a cylindrical injection cylinder (1), a conical discharge cylinder (2) at the front end of the injection cylinder (1), the rear end of the conical cylinder being connected to the injection cylinder (1), an opening at the front end connecting to a discharge pipe (3), a discharge valve (4) on the discharge pipe (3), a feed inlet at the front end of the side wall of the injection cylinder (1), the feed inlet being connected to a feed pipe (5), a feed valve (6) on the feed pipe (5), characterized in that, It also includes an expansion airbag (8), and a vent hole (7) is provided in the middle of the rear end face of the injection cylinder (1). An expansion airbag (8) is provided inside the injection cylinder (1). The expansion airbag (8) is cylindrical. The rear end of the expansion airbag (8) is connected to the rear end cover of the injection cylinder (1), and the vent hole (7) is connected to the inside of the expansion airbag (8). The outer side of the expansion airbag (8) does not contact the side wall of the injection cylinder (1). When the expansion airbag (8) is inflated, it moves from back to front in the injection cylinder (1) to push the powder forward. When the expansion airbag (8) is pulled out, the material push plate (9) at the front end of the expansion airbag (8) moves from front to back in the injection cylinder (1). The vent hole (7) is connected to the blowing and suction devices.

2. A pneumatic powder filling machine according to claim 1, characterized in that The inflatable airbag (8) is shaped like a bamboo joint.

3. A pneumatic powder filling machine according to claim 2, characterised in that The inflatable airbag (8) includes an outer protruding ring, an inner concave ring, a front fixing ring, and a rear fixing ring. The outer protruding ring and the inner concave ring are arranged at intervals. The front edge of the front protruding ring is fixed to the circumference of the material push plate (9), and the rear edge of the rear protruding ring is fixed to the rear end cover of the injection cylinder (1).

4. The pneumatic powder filler according to claim 1, characterized in that The inflatable airbag (8) has a material pusher plate (9) at the front end. The material pusher plate (9) is a hard circular shape and is kept at a distance from the inner wall of the injection cylinder (1) and does not come into contact with it.

5. The pneumatic powder filler according to claim 1, characterized in that The vent (7) is connected to an air pipe, which is connected to a bidirectional air pump or one end of a Y-shaped air pipe (10). Both ends of the Y-shaped air pipe (10) are connected to an air source (11) or a suction air pump (12).

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