EVOH pellet long-distance positive pressure pneumatic conveying device

Abstract

The utility model provides a kind of EVOH granule long-distance positive pressure pneumatic conveying device, including gas source, EVOH storehouse, packing storehouse, powder remover, packing machine and dust collector;The discharge port of EVOH storehouse is connected with the feed inlet of packing storehouse by conveying pipeline, and gas source supplies gas for conveying pipeline;Packing storehouse is connected with powder remover by blanking pipeline, and blanking pipe mouth of powder remover is connected with packing machine;The exhaust port of powder remover and packing storehouse is respectively connected with dust collection pipeline, and dust collection pipeline is connected with dust collector.The EVOH granule long-distance positive pressure pneumatic conveying device uses gas source power equipment as power source, compresses fluid medium air to form positive pressure or negative pressure, material is added into conveying pipeline under the action of compressed air, material is conveyed to end packing storehouse by conveying pipeline, and conveying air is filtered by dust collector and then vented.

Description

Technical Field

[0001] This utility model relates to a conveying device, specifically, to a long-distance positive pressure pneumatic conveying device for EVOH granules. Background Technology

[0002] Ethylene-vinyl alcohol copolymer (EVOH) combines the processability of ethylene polymers with the barrier properties of vinyl alcohol polymers, exhibiting good processability and excellent barrier properties against gases, odors, fragrances, and solvents. In actual production, EVOH is usually packaged in granular form for transportation and distribution. EVOH granules have good flowability, and during packaging, they are typically conveyed using pneumatic conveying equipment. Currently, there are many related pneumatic conveying devices, such as a material pneumatic conveying system disclosed in Chinese Patent CN120308667A and a system for improving the conveying rate of pneumatic conveying disclosed in Chinese Patent CN223032372U. However, during the production process, some EVOH powder can easily enter the packaging equipment along with the EVOH granules, affecting the quality of the EVOH granules.

[0003] In order to solve the above problems, people have been seeking an ideal technological solution. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by providing a long-distance positive pressure pneumatic conveying device for EVOH granules.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A long-distance positive pressure pneumatic conveying device for EVOH granules includes an air source, an EVOH silo, a packaging silo, a dust collector, a packaging machine, and a dust collector. The outlet of the EVOH silo is connected to the inlet of the packaging silo via a conveying pipeline, and the air source supplies air to the conveying pipeline. The packaging silo is connected to the dust collector via a discharge pipeline, and the discharge port of the dust collector is connected to the packaging machine. The exhaust ports of the dust collector and the packaging silo are respectively connected to dust collection pipelines, and the dust collection pipelines are connected to the dust collector.

[0006] A manual ball valve, a pneumatic ball valve, a regulating valve, and a pressure transmitter are installed sequentially between the delivery pipeline and the gas source.

[0007] A rotary valve, a shaft-sealed solenoid valve, and a shaft-sealed filter pressure reducing valve are installed between the discharge port of the EVOH silo and the conveying pipeline.

[0008] Two packaging material silos are set up, and a reversing valve is installed on the conveying pipeline to connect the two packaging material silos respectively.

[0009] The dust collector is located below the packaging hopper, the packaging machine is located below the dust collector, and the discharge pipe is located in the gravity discharge pipe.

[0010] The dust collector includes a support frame and a dust collector housing mounted on the support frame. The dust collector housing is provided with a feed inlet, an air inlet, an exhaust inlet, and a discharge inlet. The feed inlet is connected to the discharge pipe, the air inlet is connected to an air source, the exhaust inlet is connected to a dust collector, and the discharge inlet is connected to a packaging machine.

[0011] The dust removal fan is connected to the air inlet via a dust removal duct, and a manual valve for adjusting the airflow is installed on the dust removal duct.

[0012] The feed inlet and exhaust outlet are located on the upper side of the dust removal housing, while the air inlet and discharge outlet are located on the lower side of the dust removal housing.

[0013] The dust removal shell is tilted, with the feed inlet and air inlet near the higher end of the dust removal shell, and the exhaust inlet and discharge outlet near the lower end of the dust removal shell.

[0014] The interior of the dust removal housing is equipped with a discharge baffle corresponding to the feed inlet, a perforated baffle corresponding to the air inlet, and a baffle corresponding to the exhaust outlet. The upper side of the discharge baffle is hinged to the inner wall of the dust removal housing. The side of the dust removal housing is controlled by a bolt, one end of which extends into the interior of the dust removal housing and abuts against the discharge baffle.

[0015] Compared to existing technologies, the advantages of this invention are as follows: This invention provides a long-distance positive pressure pneumatic conveying device for EVOH granules. It uses a pneumatic power source to compress air into a positive or negative pressure. The material is fed into the conveying pipeline under the action of compressed air, and then transported to the final packaging hopper. The conveying air is filtered by a dust collector before being released. The material in the packaging hopper passes through a dust collector to remove EVOH powder before entering the packaging machine, preventing EVOH powder contamination and fully ensuring the quality of the EVOH. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the dust remover in this utility model.

[0017] Figure 2 This is a schematic diagram of the structure of this utility model.

[0018] Figure 3 This is a block diagram of the control principle in this utility model.

[0019] In the diagram: 1. Feed inlet; 2. Air inlet; 3. Exhaust inlet; 4. Discharge inlet; 5. Discharge baffle; 6. Control bolt; 7. Perforated baffle; 8. Baffle plate; 9. Glass window; 10. Dust removal housing; 11. Bracket; 12. Manual ball valve; 13. Pneumatic ball valve; 14. Regulating valve; 15. Pressure transmitter; 16. EVOH silo; 17. Rotary valve; 18. Conveying pipeline; 19. Reversing valve; 20. Packaging silo; 21. Central dust collector; 22. Differential pressure transmitter; 23. Shaft seal solenoid valve; 24. Shaft seal filter pressure reducing valve; 25. Gravity discharge pipeline; 26. Dust removal fan; 27. Air regulating manual valve; 28. Dust removal duct; 29. ​​Dust collector; 30. Dust collection pipeline. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. "Installed," "equipped with," and "connected" can employ conventional means in the prior art, such as integral installation, snap-fit ​​installation, welding connection, adhesive connection, bolted connection, etc. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances and select suitable connection, setting, or installation methods from the existing technology.

[0022] like Figure 1-3 As shown, a long-distance positive pressure pneumatic conveying device for EVOH granules includes an air source, an EVOH silo 16, a packaging silo 20, a dust collector 29, a packaging machine, and a dust collector. The outlet of the EVOH silo 16 is connected to the inlet of the packaging silo 20 via a conveying pipe 18, and the air source supplies air to the conveying pipe 18. The packaging silo 20 is connected to the dust collector 29 via a discharge pipe, and the discharge port 4 of the dust collector 29 is connected to the packaging machine. The exhaust ports of the dust collector 29 and the packaging silo 20 are respectively connected to a dust collection pipe 30, which is connected to the dust collector. A differential pressure transmitter 22 is installed on the dust collector. In one embodiment, a manual ball valve 12, a pneumatic ball valve 13, a regulating valve 14, and a pressure transmitter 15 are sequentially arranged between the delivery pipeline 18 and the gas source.

[0023] In one embodiment, a rotary valve 17, a shaft seal solenoid valve 23, and a shaft seal filter pressure reducing valve are provided between the discharge port of the EVOH silo 16 and the conveying pipe 18.

[0024] In one embodiment, two packaging hoppers 20 are provided, and a reversing valve 19 is provided on the conveying pipe 18 to connect the two packaging hoppers 20 respectively.

[0025] In one embodiment, the dust collector 29 is located below the packaging hopper 20, the packaging machine is located below the dust collector 29, and the discharge pipe is located in the gravity discharge pipe.

[0026] In one embodiment, the dust collector 29 includes a support 11 and a dust collector housing 10 disposed on the support 11. The dust collector housing 10 is provided with a feed inlet 1, an air inlet 2, an exhaust inlet 3, and a discharge inlet 4. The feed inlet 1 is connected to the discharge pipe, the air inlet 2 is connected to an air source, the exhaust inlet 3 is connected to a dust collector, and the discharge inlet 4 is connected to a packaging machine.

[0027] In one embodiment, the dust removal fan is connected to the air inlet 2 via a dust removal duct 28, and a manual air regulating valve is provided on the dust removal duct 28.

[0028] In one embodiment, the feed port 1 and the exhaust port 3 are located on the upper side of the dust removal housing 10, and the air inlet 2 and the discharge port 4 are located on the lower side of the dust removal housing 10.

[0029] In one embodiment, the dust removal housing 10 is inclined, with the feed port 1 and the air inlet 2 close to the higher end of the dust removal housing 10 to facilitate the material entering the dust removal housing and making full contact with the gas, and the exhaust port 3 and the discharge port 4 close to the lower end of the dust removal housing 10 to facilitate the discharge of material and the exhaust of dust-laden gas.

[0030] In one embodiment, the interior of the dust removal housing 10 is provided with a discharge baffle 5 corresponding to the feed inlet 1, a porous baffle 7 corresponding to the air inlet 2, and a baffle 8 corresponding to the exhaust outlet 3. The upper side of the discharge baffle 5 is hinged to the inner wall of the dust removal housing 10. A control bolt is provided on the side of the dust removal housing 10, with one end extending into the interior of the dust removal housing 10 and abutting against the discharge baffle 5. It should be noted that the control bolt is threaded to the dust removal housing, and the length of the control bolt extending into the dust removal housing can be adjusted as needed to adjust the angle of the discharge baffle, thereby adjusting the discharge speed. Specifically, the aperture of the porous baffle is much smaller than that of EVOH, allowing only gas to pass through. Preferably, a glass window 9 is provided on the dust removal housing 10 for easy observation of the interior of the dust removal housing 10.

[0031] The dust collector works as follows: The dust collector housing 10 is fixed on the support 11, and the height of the support 11 can be selected according to different working heights of the dust collector. Material enters through the feed inlet 1, and the opening and closing degree of the discharge baffle 5 is linearly controlled by the control bolt 6, thereby controlling the discharge rate. After passing through the discharge baffle 5, the material is spread evenly on the porous baffle 7 and then discharged from the discharge outlet 3. The orifices of the porous baffle 7 are too small for material to pass through, allowing only air to pass. Gas enters through the air inlet 2, passes through the porous baffle 7 at a speed of 8-10 m / s, contacts the material, and carries away the dust. The gas carrying the dust bypasses the baffle plate and enters the atmosphere through the exhaust outlet 4. The baffle plate 8 reduces the gas velocity and changes the gas flow direction, which can more efficiently carry away dust and prevent material from being blown up and flowing out of the exhaust outlet 4. An observer can monitor the dust discharge through the glass window 9 to control the airflow speed and discharge speed, matching the optimal airflow speed for different discharge speeds.

[0032] The above embodiments can be combined with each other.

[0033] For ease of use, the long-distance positive pressure pneumatic conveying device for EVOH granules can be controlled via a control system. See the control block diagram below. Figure 3 The specific control circuits can all utilize existing technologies. The specific implementation process is as follows: the EVOH silo and rotary valve serve as the conveying and feeding unit. The rotary valve is equipped with a shaft seal solenoid valve and a shaft seal filter pressure reducing valve. Plant-supplied compressed air is reduced to an appropriate pressure through the shaft seal filter pressure reducing valve before being introduced into the rotary valve, preventing powder from entering the bearing seal of the rotary valve. The shaft seal solenoid valve can be remotely controlled. The rotary valve evenly adds material from the silo into the conveying pipeline. Using plant-supplied compressed air as the power source, the material is conveyed to the packaging silo via a reversing valve by adjusting the manual ball valve, pneumatic ball valve, and regulating valve in the air source power valve group. The gas is filtered by a centralized dust collector before being discharged into the atmosphere. The centralized dust collector is equipped with a differential pressure transmitter. When the differential pressure is greater than the set value, it indicates that the filter bag is clogged; when the differential pressure is lower than the set value, it indicates that the filter bag is damaged. In either of these abnormal situations, the filter bag needs to be cleaned or replaced. Material in the packaging hopper enters the dust collector through a gravity discharge pipe. Powered by a dust collector fan, the material enters the dust collector through a dust collector duct, separating the powder from the granules. The powder then flows through a dust collection pipe into a centralized dust collector, while the granules are packaged downstream by the packaging machine. A manual air valve is installed on the dust collector duct, allowing for control of the airflow by adjusting its opening.

[0034] The system is controlled via a pressure transmitter interlocked rotary valve: when the pressure transmitter detects a pressure higher than the set value, the system automatically reduces the feed rate by decreasing the frequency of the rotary valve; when the pressure transmitter detects that the pressure has reached a stable value, the system automatically increases the feed rate by increasing the frequency of the rotary valve. The main function of this part is to maintain a stable pressure conveying environment throughout the entire system.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A long-distance positive pressure pneumatic conveying device for EVOH granules, characterized in that: It includes an air source, an EVOH silo, a packaging silo, a dust collector, a packaging machine, and a dust collector; the outlet of the EVOH silo is connected to the inlet of the packaging silo via a conveying pipeline, and the air source supplies air to the conveying pipeline; the packaging silo is connected to the dust collector via a discharge pipeline, and the discharge port of the dust collector is connected to the packaging machine; the exhaust ports of the dust collector and the packaging silo are respectively connected to dust collection pipelines, and the dust collection pipelines are connected to the dust collector.

2. The long-distance positive pressure pneumatic conveying device for EVOH granules according to claim 1, characterized in that: A manual ball valve, a pneumatic ball valve, a regulating valve, and a pressure transmitter are installed sequentially between the delivery pipeline and the gas source.

3. The long-distance positive pressure pneumatic conveying device for EVOH granules according to claim 2, characterized in that: A rotary valve, a shaft-sealed solenoid valve, and a shaft-sealed filter pressure reducing valve are installed between the discharge port of the EVOH silo and the conveying pipeline.

4. The long-distance positive pressure pneumatic conveying device for EVOH granules according to claim 3, characterized in that: Two packaging material silos are set up, and a reversing valve is installed on the conveying pipeline to connect the two packaging material silos respectively.

5. The long-distance positive pressure pneumatic conveying device for EVOH granules according to claim 4, characterized in that: The dust collector is located below the packaging hopper, the packaging machine is located below the dust collector, and the discharge pipe is located in the gravity discharge pipe.

6. The long-distance positive pressure pneumatic conveying device for EVOH granules according to any one of claims 1-5, characterized in that: The dust collector includes a support frame and a dust collector housing mounted on the support frame. The dust collector housing is provided with a feed inlet, an air inlet, an exhaust inlet, and a discharge inlet. The feed inlet is connected to the discharge pipe, the air inlet is connected to an air source, the exhaust inlet is connected to a dust collector, and the discharge inlet is connected to a packaging machine.

7. The long-distance positive pressure pneumatic conveying device for EVOH granules according to claim 6, characterized in that: The dust removal fan is connected to the air inlet via a dust removal duct, and a manual valve for adjusting the airflow is installed on the dust removal duct.

8. The long-distance positive pressure pneumatic conveying device for EVOH granules according to claim 7, characterized in that: The feed inlet and exhaust outlet are located on the upper side of the dust removal housing, while the air inlet and discharge outlet are located on the lower side of the dust removal housing.

9. The long-distance positive pressure pneumatic conveying device for EVOH granules according to claim 8, characterized in that: The dust removal shell is tilted, with the feed inlet and air inlet near the higher end of the dust removal shell, and the exhaust inlet and discharge outlet near the lower end of the dust removal shell.

10. The long-distance positive pressure pneumatic conveying device for EVOH granules according to claim 9, characterized in that: The interior of the dust removal housing is equipped with a discharge baffle corresponding to the feed inlet, a perforated baffle corresponding to the air inlet, and a baffle corresponding to the exhaust outlet. The upper side of the discharge baffle is hinged to the inner wall of the dust removal housing. The side of the dust removal housing is controlled by a bolt, one end of which extends into the interior of the dust removal housing and abuts against the discharge baffle.

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