A wet material long-distance negative pressure conveying device and a conveying system including the device

Abstract

The present invention relates to a wet material long-distance negative pressure conveying device and a conveying system comprising the device. The device comprises a material buffer device, a metering buffer device, a vacuum source device and an air supply device. The conveying system comprises two sets of the devices, and the two sets of wet material long-distance negative pressure conveying devices respectively constitute subsystem 1 and subsystem 2 of the system; wherein the metering buffer device in subsystem 1 and the metering buffer device in subsystem 2 are connected together by a material discharge assembly to continuously convey materials to a downstream production line.

Description

Technical Field

[0001] The invention relates to the technical field of wet material negative pressure conveying, and in particular to a wet material long-distance negative pressure conveying device and a wet material long-distance negative pressure conveying system comprising the device and capable of continuously unloading materials. Background Art

[0002] Wet material conveying is a difficult technical problem to solve in the field of negative pressure conveying, especially the long-distance negative pressure conveying of wet materials in the field of medicine and food. The more popular technology now is the dry powder negative pressure conveying technology. The material is dry powder. Compared with wet materials, the friction coefficient between the material and the pipe wall is smaller, and it is easier to convey; the other is the short-distance negative pressure wet material conveying, which is relatively less technically difficult.

[0003] Currently, most of the existing material conveying systems are designed for the conveying of chemical powder materials. These systems cannot complete the long-distance conveying of wet pharmaceutical materials, let alone the long-distance conveying of wet oxidizable pharmaceutical materials (such as vitamin C). The existing problems include:

[0004] a. The material is a wet powder material with a certain viscosity and poor fluidity. In addition, the conveying distance is long, and the material is prone to adhesion and blockage in the silo and pipeline during the conveying process;

[0005] b. Material oxidation is prone to occur during transportation and shutdown;

[0006] c. Cross contamination caused by material residues between different batches;

[0007] d. It is impossible to supply materials to the next workstation uninterruptedly. Summary of the invention

[0008] The present invention aims to solve one or more of the following technical problems:

[0009] Wet materials have a certain degree of viscosity and poor fluidity. Especially when conveying over long distances, materials are prone to adhesion and blockage in silos and pipelines during the conveying process.

[0010] Oxidizable materials are prone to oxidation during transportation and during shutdown;

[0011] Cross contamination caused by material residues between different batches;

[0012] It is impossible to supply materials to the next workstation uninterruptedly.

[0013] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0014] A wet material long-distance negative pressure conveying device, comprising a material buffer device, a metering buffer device, a vacuum source device and an air supply device;

[0015] The material buffer device is used to temporarily store materials and transport the materials to the metering buffer device;

[0016] The metering buffer device is used to receive the materials delivered by the material buffer device and deliver the prepared materials to the downstream production line;

[0017] The vacuum source device includes a liquid ring vacuum pump for providing negative pressure to the metering buffer device, and a material filtering device is arranged on the negative pressure conveying pipeline;

[0018] The air supply device includes a heat exchange device, a gas filter tank and an air supply pipeline; the heat exchange device is connected to the exhaust port of the liquid ring vacuum pump to heat the gas discharged from the liquid ring vacuum pump; the heated gas enters the air supply pipeline after being filtered by the gas filter tank, and the air supply pipeline is connected to the material buffer device to allow the gas to enter the material buffer device.

[0019] Preferably, the metering cache device comprises a plurality of metering cache chambers, and the plurality of metering cache chambers are connected in parallel to a negative pressure delivery pipeline, so that the liquid ring vacuum pump provides negative pressure for the plurality of metering cache chambers.

[0020] Preferably, the material buffer device comprises a main material delivery pipeline and a plurality of material buffer bins, and the plurality of material buffer bins are connected in parallel to the main material delivery pipeline;

[0021] The main material delivery pipeline includes a plurality of discharge ports, the number of which is the same as the number of metering buffer bins, and the materials in the main material delivery pipeline are transported to the corresponding metering buffer bins through the discharge ports;

[0022] The air supply pipeline is connected to multiple material buffer bins and the main material conveying pipeline.

[0023] Preferably, the main material conveying pipeline is provided with a plurality of gas supply ports, and the gas supply pipeline conveys the gas into the main material conveying pipeline through the gas supply ports.

[0024] Preferably, the material buffer device further comprises a purge pipeline; and

[0025] The main material delivery pipeline is provided with a plurality of purge ports, and the gas transported by the purge pipeline enters the main material delivery pipeline through the purge ports.

[0026] Preferably, an oxygen concentration detector is provided in the main material delivery pipeline;

[0027] A methanol concentration detector is provided in the main material delivery pipeline;

[0028] A wind speed detection instrument is provided in the main material conveying pipeline;

[0029] A pressure reducing valve is provided on the main material delivery pipeline;

[0030] A vibrator is provided at the bend of the main material conveying pipeline;

[0031] The material buffer bin is a bin with a stirring function, and a cleaning device is installed in the bin;

[0032] The material buffer bin is provided with a star valve or a screw feeder; and / or

[0033] The metering buffer bin and the material buffer bin are equipped with measuring modules, and the measuring modules include weighing modules or material level sensors.

[0034] Preferably, the liquid ring vacuum pump adopts a liquid ring vacuum pump whose working medium is methanol solution; and / or

[0035] Pressure detectors are installed at the front and rear of the gas filter tank.

[0036] Preferably, the material filtering device adopts a vacuum feeder; and

[0037] The vacuum source device also includes a material return pipeline for conveying the materials filtered and collected by the vacuum feeder to the metering buffer device.

[0038] Preferably, the wet material long-distance negative pressure conveying equipment also includes a centralized control device for controlling the operation of the material buffer device and the metering buffer device.

[0039] A wet material long-distance negative pressure conveying system capable of continuously unloading, comprising two sets of wet material long-distance negative pressure conveying equipment provided by the present invention, the two sets of wet material long-distance negative pressure conveying equipment respectively constituting subsystem 1 and subsystem 2 of the system;

[0040] Among them, the metering buffer device in subsystem one and the metering buffer device in subsystem two are connected together by a material discharge component to continuously transport materials to the downstream production line.

[0041] Beneficial Effects

[0042] The above technical solution of the present invention has the following advantages:

[0043] With the joint action of the air supply device and the vacuum source device, the conveyed material can flow smoothly in the material conveying pipeline without being easily blocked. At the same time, the closed circulation of the equipment is realized to meet the clean environment requirements.

[0044] The two sub-conveyance systems in the wet material long-distance negative pressure conveying system with continuous feeding provided by the present invention operate alternately to ensure that the metering buffer device continuously feeds the next workstation through the feeding component. The system is particularly suitable for completing the long-distance conveyance of vitamin C wet powder materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of the wet material long-distance negative pressure conveying equipment provided by the present invention;

[0046] Figure 2 It is a structural schematic diagram of a wet material long-distance negative pressure conveying system capable of continuous feeding provided by the present invention.

[0047] In the figure:

[0048] 11: Material buffer; 12: Main material delivery pipeline; 13: Purge pipeline;

[0049] 21: Metering buffer;

[0050] 31: Liquid ring vacuum pump; 32: Negative pressure delivery pipeline; 33: Material filtering device; 34: Return pipeline;

[0051] 41: heat exchange device; 42: gas filter tank; 43: gas supply pipeline;

[0052] 5: Cutting components. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in combination with the embodiments of the present invention. Obviously, the described embodiments are 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 work are within the scope of protection of the present invention.

[0054] The present invention provides a wet material long-distance negative pressure conveying device, comprising a material buffer device, a metering buffer device, a vacuum source device and an air supply device. Figure 1 , wherein the vacuum source device includes a liquid ring vacuum pump 31 for providing negative pressure to the metering buffer device, and a material filtering device 33 is provided on the negative pressure delivery pipeline 32 (the negative pressure delivery pipeline 32 is a section of pipeline connecting the liquid ring vacuum pump 31 and the metering buffer device). The gas supply device includes a heat exchange device 41, a gas filter tank 42 and a gas supply pipeline 43; the heat exchange device 41 is connected to the exhaust port of the liquid ring vacuum pump 31 to heat the gas discharged from the liquid ring vacuum pump 31; the heated gas is filtered by the gas filter tank 42 and enters the gas supply pipeline 43, and the gas supply pipeline 43 is connected to the material buffer device, so that the gas enters the material buffer device.

[0055] When the equipment is working, the liquid ring vacuum pump 31 is the vacuum source, and the metering buffer device is pumped to a negative pressure state through the negative pressure delivery pipeline 32, the material filtering device 33, and the metering buffer device. At the same time, due to the existence of the gas replenishing device, the gas discharged by the liquid ring vacuum pump 31 during operation enters the material buffer device through the heat exchange device 41, the gas filter tank 42 and the gas replenishing pipeline 43.

[0056] The material in the material buffer device flows into the material pipeline after being discharged, and the material is transported to the metering buffer device.

[0057] In the device provided by the present invention, under the joint action of the air supply device and the vacuum source device, the conveyed material can flow smoothly in the material conveying pipeline without being easily blocked, and at the same time, the closed circulation of the equipment is realized to meet the clean environment requirements.

[0058] Each device is described in detail below.

[0059] The metering buffer device is used to receive the material delivered by the material buffer device and deliver the prepared material to the downstream production line. In the wet material long-distance negative pressure conveying equipment provided by the present invention, the metering buffer device can include a plurality of metering buffer bins 21, and the meaning of "plurality" refers to more than 2, including 2 (the plurality mentioned below has the same meaning as here), such as 2, 3, 4, etc. The enterprise can select a suitable number of metering buffer bins 21 according to the working conditions and production capacity requirements. In addition, the present invention does not specifically limit the volume of the metering buffer bin 21, and the enterprise can select a metering buffer bin 21 of a suitable volume according to the working conditions and production capacity requirements. Multiple metering buffer bins 21 are connected in parallel to the negative pressure conveying pipeline 32, so that the liquid ring vacuum pump 31 provides negative pressure for multiple metering buffer bins 21.

[0060] The metering buffer 21 may also be equipped with a measuring module ( Figure 1 The measuring module may include a weighing module or a material level sensor, wherein the weighing module is used to measure the weight of the material inside the metering buffer bin 21, and the material level sensor is used to measure the height of the material inside the metering buffer bin 21. In addition, a soft connection transition may be used when the metering buffer bin 21 is connected to each pipeline, thereby reducing the influence of the pipeline on the weighing device.

[0061] The metering buffer bin 21 can be a flat-bottomed bin with a stirring function to reduce the material residue in the bin. The metering buffer bin 21 can be equipped with a cleaning device ( Figure 1 (not shown) to achieve in-situ cleaning of the silo without any dead corners, thus preventing cross contamination between different batches of materials.

[0062] The material buffer device is used to temporarily store materials and transport the materials to the metering buffer device (or metering buffer bin 21). In the wet material long-distance negative pressure conveying device provided by the present invention, the material buffer device may include a main material conveying pipeline 12 and multiple material buffer bins 11, and multiple material buffer bins 11 are connected in parallel to the main material conveying pipeline 12. The main material conveying pipeline 12 includes multiple discharge ports, the number of which is the same as the number of metering buffer bins 21, and the materials in the main material conveying pipeline 12 are transported to the corresponding metering buffer bins 21 through the discharge ports. The air supply pipeline 43 is connected to the multiple material buffer bins 11 and the main material conveying pipeline 12.

[0063] The main material delivery pipeline 12 may also be provided with a plurality of gas replenishment ports, and the gas replenishment pipeline 43 delivers gas to the main material delivery pipeline 12 through the gas replenishment ports, so that the gas discharged from the liquid ring vacuum pump 31 is filtered by the gas filter tank 42 and then replenished into the main material delivery pipeline 12, ensuring smooth material transportation without blockage. In addition, after the system is shut down, nitrogen or other inert gases can be replenished into the equipment through the gas filter tank 42 to prevent oxidation of the materials and protect the components, and nitrogen or other inert gases can also be replenished at any time according to the concentration change.

[0064] The material buffer device may further include a purge pipeline 13. At this time, a plurality of purge ports may be provided on the main material delivery pipeline 12, and the gas transported by the purge pipeline 13 enters the main material delivery pipeline 12 through the purge ports. A corresponding purge process is provided according to different working conditions to clean the materials that may be accumulated at the intersection of the material pipeline and the inner wall of the material pipeline, so as to prevent cross contamination of materials of different batches.

[0065] The main material delivery pipeline 12 may be provided with an oxygen concentration detector ( Figure 1 Not shown), methanol concentration detector ( Figure 1 When the oxygen concentration is high, nitrogen is added to the system to prevent oxidation of the material and to prevent the risk of explosion caused by excessive methanol concentration. A pressure reducing valve ( Figure 1 The excess gas added can be discharged through a pressure reducing valve or discharged to a designated recovery device.

[0066] The main material delivery pipeline 12 may be provided with a wind speed detection instrument ( Figure 1 (not shown) to monitor the wind speed changes in the pipeline in real time to adjust the material discharge speed of the silo to prevent pipeline blockage.

[0067] The bending part of the main material delivery pipeline 12 is provided with a vibrator ( Figure 1 (not shown) to prevent materials from adhering to the inner wall of the pipe.

[0068] In addition, the material buffer bin 11 can be a flat-bottomed bin with a stirring function to reduce the material residue in the bin. In addition, a cleaning device ( Figure 1 (not shown) to achieve in-situ cleaning of the silo without any dead corners, thus preventing cross contamination between different batches of materials.

[0069] The material buffer bin 11 can be provided with a star valve or a screw feeder as a discharge device to ensure uniform and continuous material discharge, adjustable material discharge speed, and to isolate the interior of the bin from the material pipeline to prevent the negative pressure in the material pipeline from having an adverse effect on the buffer bin. The material buffer bin 11 can also be equipped with a measurement module ( Figure 1The measuring module (not shown) is used to measure the amount of material inside the material buffer bin 11. The measuring module may include a weighing module or a material level sensor. The weighing module is used to measure the weight of the material inside the material buffer bin 11, and the material level sensor is used to measure the height of the material inside the material buffer bin 11.

[0070] In the device provided by the present invention, the vacuum source device includes a liquid ring vacuum pump 31 for providing negative pressure to the metering buffer device, and a material filtering device 33 is provided on the negative pressure conveying pipeline 32. When the conveyed material is a vitamin C wet material that is easily oxidizable (generally, the wet material uses a methanol solution as a solvent), the working medium of the liquid ring vacuum pump 31 can be a methanol solution, which satisfies the working performance of the liquid ring vacuum pump 31 while preventing the gas discharged from the liquid ring vacuum pump 31 from entering the material pipeline and contaminating the material.

[0071] The material filtering device 33 may be a vacuum feeder, which can realize a self-cleaning function during continuous operation to ensure uninterrupted operation of the system. The vacuum source device also includes a return line 34, which is used to transport the material filtered and collected by the vacuum feeder to the metering buffer device (metering buffer bin 21) to reduce material loss.

[0072] The working medium of the liquid ring vacuum pump 31 is a methanol solution. In order to meet its performance requirements and fully condense the methanol carried in the gas discharged from the liquid ring vacuum pump 31, a low-temperature (such as -7°C~-12°C) coolant is required, which also causes the gas discharged from the liquid ring vacuum pump 31 to have a low temperature, affecting the material properties and the material transportation process. Therefore, the equipment of the present invention heats the gas discharged from the liquid ring vacuum pump 31 through a heat exchange device 41 (such as a heat exchanger) in the gas replenishing device, and then replenishes it into the material pipeline. In addition to the heat exchange device 41, the gas replenishing device also includes a gas filter tank 42 and a gas replenishing pipeline 43. A pressure detector can be installed before and after the gas filter tank 42 to detect the pressure difference before and after the filter element, and the filter element can be replaced in time according to the pressure difference value to ensure its filtering effect.

[0073] The wet material long-distance negative pressure conveying equipment may also include a centralized control device ( Figure 1 The control unit (not shown) is used to control the operation of the material buffer device (material buffer bin 11) and the metering buffer device (metering buffer bin 21). Each material bin (including the material buffer bin 11 and the metering buffer bin 21) can be operated intelligently with only manual start-up. The action rules are based on the previous station signal and monitored by the host computer.

[0074] In addition, each device involved in the equipment can be equipped with an electrostatic decoupling device to meet the requirements of an explosion-proof environment.

[0075] The present invention also provides a wet material long-distance negative pressure conveying system capable of continuous material discharge, comprising two sets of wet material long-distance negative pressure conveying equipment provided by the present invention, the two sets of wet material long-distance negative pressure conveying equipment respectively constituting subsystem 1 and subsystem 2 of the system;

[0076] The metering buffer device (metering buffer bin 21) in subsystem one and the metering buffer device (metering buffer bin 21) in subsystem two are connected together by a material discharge assembly 5 to continuously transport materials to the downstream production line.

[0077] like Figure 2 As shown, the two sub-conveying systems operate alternately to ensure that the metering buffer bin 21 continuously supplies materials to the next station through the four-in-one material discharge assembly. The system is particularly suitable for completing the long-distance transportation of vitamin C wet powder materials.

[0078] In addition, all components and pipelines in the system have good sealing properties to prevent large amounts of gas inside the system from leaking out and polluting the external environment, and also to prevent contamination of materials.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wet material long-distance negative pressure conveying device, characterized in that: It includes a material buffer device, a metering buffer device, a vacuum source device and an air supply device; The material buffer device is used to temporarily store materials and transport the materials to the metering buffer device; The metering buffer device is used to receive the materials delivered by the material buffer device and deliver the prepared materials to the downstream production line; The vacuum source device includes a liquid ring vacuum pump for providing negative pressure to the metering buffer device, and a material filtering device is arranged on the negative pressure conveying pipeline; The air supply device includes a heat exchange device, a gas filter tank and an air supply pipeline; the heat exchange device is connected to the exhaust port of the liquid ring vacuum pump to heat the gas discharged from the liquid ring vacuum pump; the heated gas is filtered by the gas filter tank and then enters the air supply pipeline, and the air supply pipeline is connected to the material buffer device to allow the gas to enter the material buffer device; The liquid ring vacuum pump adopts a liquid ring vacuum pump whose working medium is methanol solution; The material buffer device includes a main material delivery pipeline and multiple material buffer bins, the multiple material buffer bins are connected in parallel to the main material delivery pipeline, an oxygen concentration detector is arranged in the main material delivery pipeline, a wind speed detector is arranged in the main material delivery pipeline, and the material buffer bins are provided with star valves or screw feeders.

2. The wet material long-distance negative pressure conveying equipment according to claim 1 is characterized in that: The metering cache device includes a plurality of metering cache chambers, and the plurality of metering cache chambers are connected in parallel to a negative pressure delivery pipeline, so that a liquid ring vacuum pump provides negative pressure for the plurality of metering cache chambers.

3. The wet material long-distance negative pressure conveying equipment according to claim 2 is characterized in that: The main material delivery pipeline includes a plurality of discharge ports, the number of which is the same as the number of metering buffer bins, and the materials in the main material delivery pipeline are transported to the corresponding metering buffer bins through the discharge ports; The air supply pipeline is connected to multiple material buffer bins and the main material conveying pipeline.

4. The wet material long-distance negative pressure conveying equipment according to claim 3 is characterized in that: The main material conveying pipeline is provided with a plurality of gas supply ports, and the gas supply pipeline conveys gas to the main material conveying pipeline through the gas supply ports.

5. The wet material long-distance negative pressure conveying equipment according to claim 3 is characterized in that: The material caching device also includes a purge pipeline; and The main material delivery pipeline is provided with a plurality of purge ports, and the gas transported by the purge pipeline enters the main material delivery pipeline through the purge ports.

6. The wet material long-distance negative pressure conveying equipment according to claim 3 is characterized in that: A methanol concentration detector is provided in the main material delivery pipeline; A pressure reducing valve is provided on the main material delivery pipeline; A vibrator is provided at the bend of the main material conveying pipeline; The material buffer bin is a bin with a stirring function, and a cleaning device is installed in the bin; and / or The metering buffer bin and the material buffer bin are equipped with measuring modules, and the measuring modules include weighing modules or material level sensors.

7. The wet material long-distance negative pressure conveying equipment according to any one of claims 1 to 6, characterized in that: Pressure detectors are installed at the front and rear of the gas filter tank.

8. The wet material long-distance negative pressure conveying equipment according to any one of claims 1 to 6, characterized in that: The material filtering device adopts a vacuum feeder; and The vacuum source device also includes a material return pipeline for conveying the materials filtered and collected by the vacuum feeder to the metering buffer device.

9. The wet material long-distance negative pressure conveying equipment according to any one of claims 1 to 6, characterized in that: The wet material long-distance negative pressure conveying equipment also includes a centralized control device for controlling the operation of the material buffer device and the metering buffer device.

10. A wet material long-distance negative pressure conveying system capable of continuous feeding, characterized in that: Comprising two sets of wet material long-distance negative pressure conveying equipment according to any one of claims 1 to 9, the two sets of wet material long-distance negative pressure conveying equipment respectively constituting subsystem 1 and subsystem 2 of the system; Among them, the metering buffer device in subsystem one and the metering buffer device in subsystem two are connected together by a material discharge component to continuously transport materials to the downstream production line.

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