Pneumatic conveying equipment with backflow prevention structure

Abstract

The utility model discloses pneumatic conveying equipment with a backflow prevention structure, which relates to the technical field of pneumatic conveying equipment and comprises a support frame, an air exhaust chamber is arranged above the support frame, a roots vacuum pump is arranged on the left side of the support frame, and a backflow prevention component for preventing materials from flowing back is arranged at the bottom end of a feeding hose. According to the pneumatic conveying equipment with the backflow prevention structure, through the arrangement of the feeding pipe, the square shell, the movable block, the inner through groove, the side dustproof shell and the electric cylinder, when the pneumatic conveying equipment is used, external airflow flows in along the feeding pipe, powder is synchronously brought in, during feeding, the electric cylinder retracts, the inner through groove in the movable block is aligned with the feeding hose and the feeding pipe, the powder rapidly enters, and therefore the backflow prevention effect is achieved. And along with shutdown of the Roots vacuum pump, the electric cylinder extends to push the movable block to move towards the right side, the feeding hose and the feeding pipe are separated, dust in the feeding hose is prevented from flowing back, the function of preventing the materials from flowing back is achieved, and the problem that the device does not have the function of preventing the materials from flowing back is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic conveying equipment, in particular to a pneumatic conveying equipment with an anti-backflow structure. Background Art

[0002] Pneumatic conveying equipment uses the suction or thrust generated by air pressure difference to convey low-quality solid materials. It is generally used for conveying powders and small particles, and is widely used in casting, metallurgy, chemical industry, building materials, grain processing and other fields.

[0003] Currently, most of the common pneumatic conveying equipment on the market are similar in overall structure, with an exhaust chamber, a hopper, a bag dust collector, and a Roots vacuum pump as the main components. Under the suction of the Roots vacuum pump, a negative pressure state is formed inside the equipment, and the external air carries the material along the feed pipe into the exhaust chamber, and then gradually enters the dust collector and hopper along the pipeline. In actual use, there are some functional deficiencies and there is room for improvement. For example, during the conveying process, once the Roots vacuum pump stops, the powder in the feed pipe will flow back and return to the pile. The rapidly refluxed powder is easy to disperse under the action of inertia, affecting the environment at the pile, and it does not have the function of preventing material backflow.

[0004] Now, a new type of pneumatic conveying equipment with an anti-backflow structure is proposed to solve the above problems. Utility Model Content

[0005] The purpose of the present utility model is to provide a pneumatic conveying device with an anti-backflow structure to solve the problem that the above-mentioned background technology does not have the function of preventing material backflow.

[0006] To achieve the above-mentioned objectives, the utility model provides the following technical solutions: a pneumatic conveying equipment with an anti-backflow structure, comprising a support frame, an exhaust chamber is arranged above the support frame, a first star-shaped discharge valve is installed at the bottom end of the exhaust chamber, the bottom end of the first star-shaped discharge valve is fixedly connected to a discharge port, a feed hose is movably connected to the middle position of the top end of the exhaust chamber, a hopper is arranged on the right side of the support frame, a bag dust collector is arranged above the hopper, a feed pipe is fixedly connected between the discharge port and the bag dust collector, an exhaust pipe is movably connected to the middle position of the top end of the bag dust collector, a Roots vacuum pump is arranged on the left side of the support frame, and an anti-backflow component for preventing material backflow is provided at the bottom end of the feed hose.

[0007] The anti-backflow assembly includes a square shell, which is fixedly connected to the bottom end of the feed hose. A feed pipe is welded at the middle position of the bottom end of the square shell. A movable block is horizontally arranged inside the square shell, and an internal through groove is arranged inside the movable block. A side dustproof shell is fixedly connected to the left side of the square shell, and two groups of electric cylinders are installed on the right side of the side dustproof shell.

[0008] As a further technical solution of the present invention, the shape and size of the outer side of the movable block are adapted to the shape and size of the inner side of the square shell. The movable block can be displaced left and right along the inner side of the square shell, and the upper and lower ends of the movable block are tightly fitted with the upper and lower ends of the inner side of the square shell.

[0009] As a further technical solution of the present invention, the inner diameters of the feed hose and the feed pipe are the same, and the inner diameter of the inner through groove is slightly smaller than the inner diameters of the feed hose and the feed pipe.

[0010] As a further technical solution of the present invention, the output end of the electric cylinder is connected to the left side of the movable block, and the electric cylinder is symmetrically distributed about the horizontal center line of the movable block.

[0011] As a further technical solution of the present invention, a second star-shaped discharge valve is installed at the bottom end of the bag dust collector, a radar level meter is fixedly connected to the right side of the top of the bag dust collector, the bottom end of the second star-shaped discharge valve is connected to the top of the hopper, and the second star-shaped discharge valve and the radar level meter are electrically connected.

[0012] As a further technical solution of the present invention, a measuring tube is provided above the Roots vacuum pump, a dust concentration sensor is fixedly connected to the top of the left side of the measuring tube, an electromagnetic valve is installed at the bottom end of the measuring tube, the right side of the dust concentration sensor passes through the left side of the measuring tube and extends into the interior, and the bottom end of the electromagnetic valve is connected to the top of the Roots vacuum pump.

[0013] Compared with the prior art, the beneficial effects of the present invention are: the pneumatic conveying equipment with anti-backflow structure not only realizes the function of preventing material backflow, but also realizes the function of controlling the feeding speed and the function of filtering effect feedback;

[0014] (1) The feed pipe, square shell, movable block, inner groove, side dust cover and electric cylinder are provided. When in use, the Roots vacuum pump sucks and exhausts, and a negative pressure semi-vacuum state is formed inside the exhaust chamber and the bag dust collector. The external airflow flows in along the feed pipe, bringing the powder in synchronously. When feeding, the electric cylinder retracts, and the inner groove on the movable block is aligned with the feed hose and the feed pipe, so that the powder enters quickly. As the Roots vacuum pump stops, the electric cylinder extends, pushing the movable block to move to the right, isolating the feed hose and the feed pipe, preventing the dust inside the feed hose from flowing back, thereby achieving the function of preventing material backflow;

[0015] (2) By providing a first star-shaped discharge valve, a second star-shaped discharge valve and a radar level meter, when in use, dust enters the interior of the exhaust chamber along the feed hose, and then enters the bag dust collector along the feed pipe. The first star-shaped discharge valve controls the speed at which the material enters the feed pipe, the radar level meter monitors the material height in the bag dust collector, and the second star-shaped discharge valve adjusts the speed at which the material enters the hopper according to the material height, thereby realizing the function of controlling the feeding speed;

[0016] (3) By setting up a measuring tube, a dust concentration sensor and a solenoid valve, when in use, dust materials accumulate in the bag dust collector, and the filtered air enters the Roots vacuum pump along the exhaust pipe. As the air enters the measuring tube, the dust concentration sensor monitors the dust concentration in the air in real time. When the concentration exceeds the standard, it means that the filtering capacity of the bag dust collector is insufficient, and the solenoid valve and the Roots vacuum pump are automatically closed in turn to prevent too much dust from entering the Roots vacuum pump, thereby realizing the function of filtering effect feedback. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a front view structural diagram of the utility model;

[0018] Figure 2 This is a schematic diagram of an enlarged front cross-section of the square housing of the present invention;

[0019] Figure 3 For the utility model Figure 1 A schematic diagram of the enlarged structure of the local section at point A in the middle;

[0020] Figure 4 This is a schematic diagram of an enlarged partial cross-section of the side view of the second star-shaped discharge valve of the present invention.

[0021] In the figure: 1. Support frame; 2. Discharge port; 3. Exhaust chamber; 4. First star-shaped discharge valve; 5. Feed hose; 6. Feed pipe; 7. Square shell; 8. Movable block; 9. Inner groove; 10. Side dust cover; 11. Electric cylinder; 12. Feed pipe; 13. Hopper; 14. Bag dust collector; 15. Second star-shaped discharge valve; 16. Radar level meter; 17. Exhaust pipe; 18. Measuring tube; 19. Dust concentration sensor; 20. Solenoid valve; 21. Roots vacuum pump. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] Example: See Figure 1-4 , a pneumatic conveying equipment with an anti-backflow structure, comprising a support frame 1, an exhaust chamber 3 is provided above the support frame 1, a first star-shaped discharge valve 4 is installed at the bottom end of the exhaust chamber 3, a discharge port 2 is fixedly connected to the bottom end of the first star-shaped discharge valve 4, a feed hose 5 is movably connected to the middle position of the top of the exhaust chamber 3, a hopper 13 is provided on the right side of the support frame 1, a bag dust collector 14 is provided above the hopper 13, a feed pipe 12 is fixedly connected between the discharge port 2 and the bag dust collector 14, an exhaust pipe 17 is movably connected to the middle position of the top of the bag dust collector 14, a Roots vacuum pump 21 is provided on the left side of the support frame 1, and an anti-backflow component for preventing material backflow is provided at the bottom end of the feed hose 5;

[0024] See also Figure 1-4 A pneumatic conveying device with an anti-backflow structure also includes an anti-backflow component, which includes a square shell 7, which is fixedly connected to the bottom end of the feed hose 5. A feed pipe 6 is welded to the middle position of the bottom end of the square shell 7. A movable block 8 is horizontally arranged inside the square shell 7, and an internal through groove 9 is arranged inside the movable block 8. A side dust cover 10 is fixedly connected to the left side of the square shell 7, and two sets of electric cylinders 11 are installed on the right side of the side dust cover 10.

[0025] The shape and size of the outer surface of the movable block 8 match the shape and size of the inner surface of the square housing 7. The movable block 8 can be displaced left and right along the inner surface of the square housing 7. The upper and lower ends of the movable block 8 fit tightly with the upper and lower ends of the inner surface of the square housing 7. The inner diameters of the feed hose 5 and the feed pipe 6 are the same. The inner diameter of the inner through groove 9 is slightly smaller than the inner diameters of the feed hose 5 and the feed pipe 6. The output end of the electric cylinder 11 is connected to the left side of the movable block 8. The electric cylinder 11 is symmetrically distributed about the horizontal center line of the movable block 8 and can be blocked to prevent backflow.

[0026] Specifically, if Figure 1 and Figure 2 As shown, the electric cylinder 11 retracts, the inner groove 9 on the movable block 8 is aligned with the feed hose 5 and the feed pipe 6, and the powder enters quickly. As the Roots vacuum pump 21 stops, the electric cylinder 11 extends, pushing the movable block 8 to the right, isolating the feed hose 5 and the feed pipe 6, and preventing the dust inside the feed hose 5 from flowing back.

[0027] A second star-shaped discharge valve 15 is installed at the bottom end of the bag dust collector 14. A radar level meter 16 is fixedly connected to the right side of the top of the bag dust collector 14. The bottom end of the second star-shaped discharge valve 15 is connected to the top end of the hopper 13. The second star-shaped discharge valve 15 and the radar level meter 16 are electrically connected to control the feeding speed.

[0028] Specifically, if Figure 1 and Figure 4 As shown, the first star-shaped discharge valve 4 controls the speed of the material entering the feed pipe 12, the radar level meter 16 monitors the material height in the bag filter 14, and the second star-shaped discharge valve 15 adjusts the speed of the material entering the hopper 13 according to the material height.

[0029] A measuring tube 18 is provided above the Roots vacuum pump 21. A dust concentration sensor 19 is fixedly connected to the top of the left side of the measuring tube 18. A solenoid valve 20 is installed at the bottom end of the measuring tube 18. The right side of the dust concentration sensor 19 passes through the left side of the measuring tube 18 and extends into the interior. The bottom end of the solenoid valve 20 is connected to the top of the Roots vacuum pump 21 to monitor the filtration effect.

[0030] Specifically, if Figure 1 and Figure 3 As shown, air enters the measuring tube 18, and the dust concentration sensor 19 monitors the dust concentration in the air in real time. When the concentration exceeds the standard, it indicates that the filtering capacity of the bag filter 14 is insufficient, and the solenoid valve 20 and the Roots vacuum pump 21 are automatically closed in sequence to prevent excessive dust from entering the Roots vacuum pump 21.

[0031] Working principle: When the present invention is in use, first, the Roots vacuum pump 21 sucks and exhausts, forming a negative pressure semi-vacuum state inside the exhaust chamber 3 and the bag-type dust collector 14. The external airflow then flows in along the feed pipe 6, bringing the powder in synchronously. During feeding, the electric cylinder 11 retracts, and the internal groove 9 on the movable block 8 is aligned with the feed hose 5 and the feed pipe 6, allowing the powder to enter quickly. As the Roots vacuum pump 21 stops, the electric cylinder 11 extends, pushing the movable block 8 to the right, isolating the feed hose 5 and the feed pipe 6, and preventing the dust inside the feed hose 5 from flowing back. The dust enters the exhaust chamber 3 along the feed hose 5, and then enters the bag-type dust collector 14 along the feed pipe 12. The first star-shaped discharge valve 4 controls the speed at which the material enters the feed pipe 12. The radar level meter 16 monitors the material height in the bag-type dust collector 14. The second star-shaped discharge valve 15 adjusts the speed at which the material enters the hopper 13 according to the material height. Dust accumulates in the bag filter 14 , and the filtered air flows along the exhaust pipe 17 into the Roots vacuum pump 21 . As the air enters the measuring tube 18 , the dust concentration sensor 19 monitors the dust concentration in the air in real time. When the concentration exceeds the standard, it indicates that the filtering capacity of the bag filter 14 is insufficient. The solenoid valve 20 and the Roots vacuum pump 21 are automatically closed in sequence to prevent excessive dust from entering the Roots vacuum pump 21 .

[0032] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A pneumatic conveying device with an anti-backflow structure, comprising a support frame (1), characterized in that: An exhaust chamber (3) is provided above the support frame (1), a first star-shaped discharge valve (4) is installed at the bottom end of the exhaust chamber (3), a discharge port (2) is fixedly connected to the bottom end of the first star-shaped discharge valve (4), a feed hose (5) is movably connected to the middle position of the top end of the exhaust chamber (3), a hopper (13) is provided on the right side of the support frame (1), a bag dust collector (14) is provided above the hopper (13), a feed pipe (12) is fixedly connected between the discharge port (2) and the bag dust collector (14), an exhaust pipe (17) is movably connected to the middle position of the top end of the bag dust collector (14), a Roots vacuum pump (21) is provided on the left side of the support frame (1), and a backflow prevention component for preventing material backflow is provided at the bottom end of the feed hose (5); The backflow prevention assembly includes a square shell (7), the square shell (7) is fixedly connected to the bottom end of the feed hose (5), a feed pipe (6) is welded at the middle position of the bottom end of the square shell (7), a movable block (8) is horizontally arranged inside the square shell (7), an inner groove (9) is arranged inside the movable block (8), a side dust cover (10) is fixedly connected to the left side of the square shell (7), and two groups of electric cylinders (11) are installed on the right side of the side dust cover (10).

2. The pneumatic conveying equipment with an anti-backflow structure according to claim 1, characterized in that: The shape and size of the outer portion of the movable block (8) are adapted to the shape and size of the inner portion of the square shell (7); the movable block (8) can be displaced left and right along the inner portion of the square shell (7); and the upper and lower ends of the movable block (8) are tightly fitted to the upper and lower ends of the inner portion of the square shell (7).

3. The pneumatic conveying equipment with an anti-backflow structure according to claim 1, characterized in that: The inner diameters of the feed hose (5) and the feed pipe (6) are the same, and the inner diameter of the inner through groove (9) is slightly smaller than the inner diameters of the feed hose (5) and the feed pipe (6).

4. The pneumatic conveying equipment with an anti-backflow structure according to claim 1, characterized in that: The output end of the electric cylinder (11) is connected to the left side of the movable block (8), and the electric cylinder (11) is symmetrically distributed about the horizontal center line of the movable block (8).

5. The pneumatic conveying equipment with an anti-backflow structure according to claim 1, characterized in that: A second star-shaped discharge valve (15) is installed at the bottom end of the bag dust collector (14), a radar level meter (16) is fixedly connected to the right side of the top of the bag dust collector (14), the bottom end of the second star-shaped discharge valve (15) is connected to the top end of the hopper (13), and the second star-shaped discharge valve (15) and the radar level meter (16) are electrically connected.

6. The pneumatic conveying equipment with an anti-backflow structure according to claim 1, characterized in that: A measuring tube (18) is provided above the Roots vacuum pump (21), a dust concentration sensor (19) is fixedly connected to the top of the left side of the measuring tube (18), a solenoid valve (20) is installed at the bottom end of the measuring tube (18), the right side of the dust concentration sensor (19) passes through the left side of the measuring tube (18) and extends into the interior, and the bottom end of the solenoid valve (20) is connected to the top end of the Roots vacuum pump (21).

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