A dense phase conveying device

Abstract

This utility model relates to the field of dense phase conveying technology, specifically to a dense phase conveying device, including an electrostatic treatment chamber, a conveying hopper, and a conveying pipeline. The electrostatic treatment chamber has an inlet and an outlet at its top and bottom, respectively. A fan is located on one side of the electrostatic treatment chamber, and the fan is connected to the bottom of the electrostatic treatment chamber via a duct. A first negative ion generator is located along the connection path between the fan and the electrostatic treatment chamber. The top of the conveying hopper is connected to the outlet, and a first valve body is located between the outlet and the conveying hopper. The bottom of the conveying hopper has an outlet, which is connected to the conveying pipeline. Addressing the technical problems of existing dense phase conveying devices, this utility model adds an electrostatic treatment chamber before the conveying hopper, eliminating static electricity generated by particle friction during feeding by introducing negative ion air into the electrostatic treatment chamber.

Description

Technical Field

[0001] This utility model relates to the field of dense phase conveying technology, and specifically to a dense phase conveying device. Background Technology

[0002] In existing cross-linked polyethylene insulation production processes using the post-suction method, the production lines are typically vertically laid out, requiring significant vertical space. Consequently, the equipment is generally installed on higher floors. Due to the power limitations of traditional suction-type feeders, the higher floors prevent the conveying of polyethylene raw materials from lower to higher floors from being accomplished using suction machines. Therefore, a dense-phase conveying method is required for feeding.

[0003] Existing dense phase conveying solutions have certain drawbacks: First, existing dense phase conveying equipment is all customized complete sets of equipment. For example, during the process of raw material particles such as polyethylene entering the hopper of the dense phase conveying equipment, the particles rub against each other, generating a large amount of static electricity on their surfaces. When passing through the dense phase conveying pipe, the tiny dust particles attracted by this static electricity adhere to the inner wall of the pipe, making the inner wall of the dense phase conveying pipe less smooth. After long-term material conveying, a large amount of material fibers will accumulate on the inner wall of the pipe, eventually falling off and mixing into the finished material, affecting production. Furthermore, because the cycle of fiber formation inside the pipes of traditional dense phase conveying devices is very short, the dense phase conveying pipes require frequent cleaning. Frequent cleaning not only increases the workload, but the excessively high cleaning frequency also causes faster wear on the inner wall of the pipes, shortening the pipe life and making pipe replacement too costly. Utility Model Content

[0004] To address the technical problems of existing dense phase conveying devices, this utility model provides a dense phase conveying device that adds an electrostatic treatment chamber before the conveying hopper. By introducing negative ion air into the electrostatic treatment chamber, static electricity generated by particle friction during feeding is eliminated.

[0005] The technical solution provided by this utility model is as follows: a dense phase conveying device, comprising an electrostatic treatment chamber, a conveying hopper, and a conveying pipeline; the top and bottom of the electrostatic treatment chamber are respectively provided with an inlet and a outlet, a fan is provided on one side of the electrostatic treatment chamber, the fan is connected to the bottom of the electrostatic treatment chamber through a duct, and a first negative ion generator is provided on the connection path between the fan and the electrostatic treatment chamber; the top of the conveying hopper is connected to the outlet, and a first valve body is provided between the outlet and the conveying hopper; the bottom of the conveying hopper is provided with an outlet, and the outlet is connected to the conveying pipeline.

[0006] Optionally, the top of the conveying hopper is provided with an air inlet pipe and a vent pipe communicating with the inner cavity. The air inlet pipe is used to connect to an air pump and is provided with a second negative ion generator. The vent pipe is provided with a vent valve. A second valve body is provided between the discharge port and the conveying pipe.

[0007] Optionally, the conveying pipe is provided with corrugated patterns inside.

[0008] Optionally, the conveying pipeline is fitted with a water-cooled jacket, with an inlet at one end and an outlet at the other end.

[0009] Optionally, the height of the water inlet on the water-cooling jacket is lower than the height of the water outlet.

[0010] Optionally, a partition net is fixedly installed inside the electrostatic treatment chamber. The bottom of the partition net has an opening that communicates with the discharge port. The portion of the partition net other than the opening has a gap with the bottom of the electrostatic treatment chamber.

[0011] Optionally, the mesh is funnel-shaped, and the opening is located at the bottom of the mesh.

[0012] Optionally, the electrostatic treatment chamber is provided with a dust removal interface for connecting an external dust removal device.

[0013] Beneficial effects Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: In view of the technical problems of the defects of the existing dense phase conveying device, this utility model adds an electrostatic treatment chamber before the conveying hopper, and eliminates the static electricity generated by particle friction during feeding by introducing negative ion wind into the electrostatic treatment chamber. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a dense phase conveying device proposed in an embodiment of the present invention. Detailed Implementation

[0015] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0016] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the relevant utility model and not intended to limit the utility model. Furthermore, it should be noted that, for ease of description, only the parts related to the utility model are shown in the accompanying drawings. The terms "first," "second," etc., used in this utility model are provided for the convenience of describing the technical solution of this utility model and have no specific limiting effect; they are all general terms and do not constitute a limitation on the technical solution of this utility model. It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Multiple technical solutions in the same embodiment, as well as multiple technical solutions in different embodiments, can be arranged and combined to form new technical solutions that do not contradict or conflict, all of which are within the scope of protection claimed by this utility model.

[0017] Example 1 Combined with appendix Figure 1 This embodiment proposes a dense phase conveying device, including an electrostatic treatment chamber 1, a conveying hopper 3, and a conveying pipe 42. The electrostatic treatment chamber 1 has an inlet 11 at its top and an outlet 14 at its bottom. A fan 2 is installed on one side of the electrostatic treatment chamber 1, and the outlet of the fan 2 is connected to the bottom of the electrostatic treatment chamber 1 via a duct 21. A first negative ion generator 22 is installed along the connection path between the fan 2 and the electrostatic treatment chamber 1. The top of the conveying hopper 3 is connected to the outlet 14, and a first valve body 15 is installed between the outlet 14 and the conveying hopper 3. The bottom of the conveying hopper 3 has an outlet 4, which is connected to the conveying pipe 42. A second valve body 41 is installed between the outlet 4 and the conveying pipe 42.

[0018] Analysis of traditional dense phase conveying equipment reveals that the main reason for stringing in the pipes of dense phase conveying equipment is that: during the process of raw material particles such as polyethylene entering the silo, the particles rub against each other, generating a large amount of static electricity on the surface. When passing through the pipes of the dense phase conveying equipment, the tiny dust particles on the surface of the polyethylene particles due to static electricity will be adsorbed onto the inner wall of the pipe, making the smoothness of the inner wall of the pipe of the dense phase conveying equipment worse, thus producing stringing.

[0019] Furthermore, when a large amount of material particles such as polyethylene pass through the pipes of dense phase conveying equipment for a long time, they will inevitably rub against the inner wall of the pipe, causing the pipe temperature to rise. After the temperature rises, the dust adsorbed on the inner wall of the pipe will undergo slight plasticization, which will further adhere to the inner wall of the pipe, making the inner wall of the pipe rougher. Long-term accumulation will further form filaments.

[0020] For the dense phase conveying device of this embodiment, the fiber drawing situation can be improved by eliminating static electricity in the material. The working principle of the dense phase conveying device of this embodiment is as follows: First, keep the first valve body 15 closed, and materials such as polyethylene particles enter the electrostatic treatment chamber 1. Start the fan 2 and the first negative ion generator 22. The wind rich in negative ions is blown in from the bottom of the electrostatic treatment chamber 1 and blown towards the material particles. The material particles are in a "boiling" state under the action of wind force, and at the same time, the negative ions effectively remove the static electricity on the surface of the material particles.

[0021] After the boiling and destatication process is completed, the first valve 15 opens, and the material in the electrostatic treatment chamber 1 falls into the conveying hopper 3, and finally enters the conveying pipe 42 to be transported to the subsequent process. Since an electrostatic treatment chamber 1 is added before the conveying hopper 3 in this embodiment, the static electricity generated by particle friction during feeding is eliminated by introducing negative ion air into the electrostatic treatment chamber 1, thereby improving the formation of filaments in the conveying pipe 42.

[0022] Furthermore, due to the presence of negative ion wind, the particles are cooled to a certain extent, thereby improving the temperature rise caused by friction between the particles and the inner wall of the pipe, and to a certain extent improving the plasticization of the dust adsorbed on the inner wall of the pipe, thereby further improving the adhesion of the dust to the inner wall of the pipe and improving the formation of filaments.

[0023] Furthermore, the top of the conveying hopper 3 is provided with an air inlet pipe 31 and a ventilation pipe 33 that communicate with the inner cavity. The air inlet pipe 31 is used to connect to the air pump, and a second negative ion generator 32 is provided on the air inlet pipe 31. A ventilation valve 34 is provided on the ventilation pipe 33. A second valve body 41 is provided between the discharge port 4 and the conveying pipe 42.

[0024] Based on this implementation method and the aforementioned working principle, when the material after static electricity removal in the electrostatic treatment chamber 1 falls into the conveying hopper 3, the second valve body 41 can be closed first to prevent the material from falling into the conveying pipe 42. At the same time, the vent valve 34 is opened to balance the pressure inside the conveying hopper 3. When the material accumulates to a suitable level in the conveying hopper 3, the vent valve 34 and the second valve body 41 are closed to keep the entire conveying hopper 3 in a sealed state. At this time, the air pump connected to the air inlet pipe 31 is started to pressurize the inside of the conveying hopper 3, and at the same time, the second negative ion generator 32 is turned on to make the high-pressure gas environment inside the conveying hopper 3 rich in negative ions.

[0025] When the air pressure reaches the appropriate process conditions, the second valve opens, and the air pump does not turn off, but continues to pump air into the conveying hopper 3. At this time, the material particles in the conveying hopper 3 are rapidly passed through the second valve body 41 and enter the conveying pipe 42 under the action of the high-pressure airflow rich in negative ions. The material particles will form a material column under the action of high-pressure air and move along the conveying pipe 42. At the same time, the high-pressure air is rich in negative ions, which can eliminate the frictional static electricity generated in real time when the particles move forward, and prevent dust from adsorbing onto the pipe wall of the conveying pipe 42.

[0026] Therefore, the electrostatic treatment chamber 1 and the conveying chamber 3 constitute a two-stage feeding system, adding an extra step of electrostatic removal to the material. This effectively reduces the adsorption of dust by static electricity, thus reducing the possibility of fiber formation. Furthermore, the material conveying process is accompanied by a high-pressure airflow rich in negative ions, making it less prone to static electricity generation. Combined with the aforementioned implementation method, the continuously injected high-pressure airflow can also remove heat from the conveying path to a certain extent, thereby improving fiber formation.

[0027] Based on actual production experience, the pipeline of traditional dense phase conveying equipment adopts a straight pipe design. When polyethylene particles are conveyed inside the pipeline, they will directly rub against the inner wall of the pipeline. When the inner wall of the pipeline is hot and not smooth enough, the surface of the material particles is easily damaged, which will lead to the pipeline being stringy.

[0028] Therefore, in a further embodiment, the conveying pipe 42 is provided with corrugated ridges 43 inside. The corrugated ridges 43 inside the conveying pipe 42 can cause material particles to be obstructed when passing through the conveying pipe 42, resulting in tumbling. At this time, the material particles close to the inner wall of the conveying pipe 42 will move forward in a tumbling and jumping manner, rather than simply sliding along the pipe wall, which greatly reduces the friction between the material particles and the pipe wall and avoids the formation of strings.

[0029] In another preferred embodiment, a water-cooled jacket 44 is fitted around the outside of the conveying pipe 42. One end of the water-cooled jacket 44 has a water inlet 45, and the other end has a water outlet 46. Thus, cooling water is introduced into the water-cooled jacket 44 through the water inlet 45, achieving real-time cooling of the conveying pipe 42 and preventing temperature rise caused by long-term material conveying, thereby preventing slight plasticization of the material and resulting in stringing. Preferably, the height of the water inlet 45 on the water-cooled jacket 44 is lower than the height of the water outlet 46. This ensures that the water flows fully from bottom to top through the water-cooled jacket 44, guaranteeing direct and sufficient heat exchange between the cooling water and the conveying pipe 42, thereby improving the cooling effect.

[0030] In one embodiment, a partition net 13 is fixedly installed inside the electrostatic treatment chamber 1. The bottom of the partition net 13 has an opening that communicates with the discharge port 14. A gap exists between the partition net 13 and the bottom of the electrostatic treatment chamber 1, except for the opening. Preferably, the partition net 13 is funnel-shaped, with the opening located at the bottom. The main body of the funnel-shaped partition net 13 is conical, naturally forming a gap with the bottom of the electrostatic treatment chamber 1. Thus, the partition net 13 can prevent material from clogging the connection between the air duct 21 and the electrostatic treatment chamber 1. After material particles enter the electrostatic treatment chamber 1, they fall onto the partition net 13. Air rich in negative ions can be blown in through the gap at the bottom of the partition net 13, passing through the partition net 13 and onto the material particles, causing the particles to boil while removing surface static electricity. Furthermore, the funnel-shaped partition net 13 facilitates the flow of material particles to the discharge port 14.

[0031] In other embodiments, the electrostatic treatment chamber 1 is provided with a dust removal interface 12, which is used to connect an external dust removal device. The dust removal device can be a device consisting of a dust removal fan 2 and a cyclone dust collector. The dust removal fan 2 can extract material particles from the electrostatic treatment chamber 1 and then guide them into the cyclone dust collector for processing. The cyclone dust collector uses the principle of centrifugal force to separate dust and particles.

[0032] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited to this. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A dense phase conveying device, characterized in that It includes an electrostatic treatment chamber (1), a conveying hopper (3), and a conveying pipeline (42); The top and bottom of the electrostatic treatment chamber (1) are respectively provided with a feed inlet (11) and a discharge outlet (14). A fan (2) is provided on one side of the electrostatic treatment chamber (1). The fan (2) is connected to the bottom of the electrostatic treatment chamber (1) through a duct (21). A first negative ion generator (22) is provided on the connection path between the fan (2) and the electrostatic treatment chamber (1). The top of the conveying hopper (3) is connected to the discharge port (14), and a first valve body (15) is provided between the discharge port (14) and the conveying hopper (3); the bottom of the conveying hopper (3) is provided with a discharge port (4), and the discharge port (4) is connected to the conveying pipe (42).

2. A dense phase conveying device according to claim 1, characterised in that The top of the conveying hopper (3) is provided with an air inlet pipe (31) and a ventilation pipe (33) communicating with the inner cavity. The air inlet pipe (31) is used to connect to an air pump. A second negative ion generator (32) is provided on the air inlet pipe (31). A ventilation valve (34) is provided on the ventilation pipe (33). A second valve body (41) is provided between the discharge port (4) and the conveying pipe (42).

3. A dense phase conveying device according to claim 1, wherein The conveying pipe (42) has corrugated (43) inside.

4. The dense phase conveying device according to claim 1, characterized in that, The conveying pipe (42) is fitted with a water-cooled jacket (44), one end of which is provided with a water inlet (45) and the other end of which is provided with a water outlet (46).

5. A dense phase conveying device according to claim 4, characterized in that, The height of the inlet (45) on the water-cooled jacket (44) is lower than the height of the outlet (46).

6. A dense phase conveying device according to claim 1, characterized in that, A partition net (13) is fixedly installed inside the electrostatic treatment chamber (1). The bottom of the partition net (13) is provided with an opening, which is connected to the discharge port (14). The part of the partition net (13) other than the opening has a gap with the bottom of the electrostatic treatment chamber (1).

7. A dense phase conveying device according to claim 6, characterized in that, The mesh (13) is funnel-shaped, and the opening is located at the bottom of the mesh (13).

8. A dense phase conveying device according to claim 1, characterized in that, The electrostatic treatment chamber (1) is provided with a dust removal interface (12), which is used to connect an external dust removal device.

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