Powder pneumatic conveying and weighing system

Abstract

The utility model provides a powder pneumatic conveying weighing batching system, including hopper, weighing sensor and control system, hopper top sets up the unloading valve, and the both sides of unloading valve set up soft connection subassembly, and unloading valve connects air compressor, the bottom of hopper is connected with small cone hopper through pneumatic butterfly valve, and the bottom of small cone hopper sets up third soft connection, and third soft connection is connected with fan through pipeline, and the lateral wall of small cone hopper sets up breath, and control system is electrically connected unloading valve, weighing sensor and pneumatic butterfly valve, and unloading valve includes pneumatic actuator, casing, material baffle, sealing through -hole ware, and the top of casing sets up pneumatic actuator, and the pivot of pneumatic actuator is connected with sealing through -hole ware, and one end of pneumatic actuator connects air compressor. The utility model adopts the material conveying of pneumatic conveying mode, is very suitable for long -distance conveying, and equipment structure is simple, and cost is low, and the weighing precision is high, and maintenance is convenient, and for the need multiple weighing batching condition greatly reduced use cost.

Description

Technical Field

[0001] This utility model belongs to the field of pneumatic conveying technology for powders such as grains, food, medicine, chemicals, and plastics, and specifically relates to a pneumatic conveying, weighing, and batching system for powders. Background Technology

[0002] In the pneumatic conveying of powder materials, batching and weighing is a crucial step. Weight-reducing or weight-increasing batching systems are typically employed. These systems generally consist of a discharge valve, hopper, weighing sensor, feeding device, and control system. Pneumatic conveying of powder requires continuous conveying while avoiding the influence of airflow on the conveying process and weighing, enabling long-distance conveying and ensuring weighing accuracy. However, typical discharge valves only allow reversing, with material and gas entering the hopper together, necessitating venting and making them unsuitable for such applications. Feeding devices generally use screw conveyors or airlock feeders. These devices are structurally complex, costly to manufacture, and cannot provide rapid long-distance conveying. They also have numerous dead zones, resulting in material residue that affects weighing accuracy, and are difficult to debug and maintain, with relatively low stability. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a powder pneumatic conveying, weighing and batching system. The powder is conveyed pneumatically, which has the advantages of long distance, simple structure, low cost and high weighing accuracy.

[0004] To achieve the above technical objectives, the technical solution adopted by this utility model is as follows: A powder pneumatic conveying, weighing, and batching system includes a hopper, a weighing sensor, and a control system. A discharge valve is provided on the top of the hopper, and flexible connection components are provided on both sides of the discharge valve. The discharge valve is connected to an air compressor. The bottom of the hopper is connected to a small cone hopper via a pneumatic butterfly valve. A third flexible connection is provided at the bottom of the small cone hopper, and the third flexible connection is connected to a blower via a pipe. A vent is provided on the side wall of the small cone hopper. The control system is electrically connected to the unloading valve, the weighing sensor, and the pneumatic butterfly valve.

[0005] Preferably, in the powder pneumatic conveying, weighing, and batching system, the flexible connection assembly includes a first flexible connection and a second flexible connection, which are respectively located on both sides of the discharge valve.

[0006] Preferably, in the powder pneumatic conveying and weighing batching system, the discharge valve includes a pneumatic actuator, a housing, a material baffle, and a sealing through-hole device. The pneumatic actuator is installed on the top of the housing, and the shaft of the pneumatic actuator extends into the housing and is connected to the outer wall of the sealing through-hole device. One end of the pneumatic actuator is connected to an air compressor.

[0007] Preferably, in the powder pneumatic conveying and weighing batching system, the material baffle and the outer wall of the sealing through-hole device are connected by clamps, the sealing through-hole device includes a material pipe and polytetrafluoroethylene layers disposed on both sides of the material pipe, and the polytetrafluoroethylene layers on both sides of the sealing through-hole device are attached to the inner wall of the shell.

[0008] Preferably, the powder pneumatic conveying and weighing batching system further includes a support frame, which includes multiple support legs and a fixed frame disposed between the multiple support legs. The hopper is disposed on the fixed frame, and a weighing sensor is disposed on the top of each support leg.

[0009] Preferably, in the powder pneumatic conveying, weighing, and batching system, the lower part of the hopper and the small cone hopper are both cone structures.

[0010] Preferably, in the powder pneumatic conveying, weighing, and batching system, the breathing port is a filter element.

[0011] Preferably, in the powder pneumatic conveying, weighing, and batching system, the first flexible connection, the second flexible connection, and the third flexible connection are all food-grade silicone tubes.

[0012] The beneficial effects of this utility model are: This utility model discloses a powder pneumatic conveying and weighing batching system. It uses pneumatic conveying for material transport, which is very suitable for long-distance transport. The equipment has a simple structure, low cost, high weighing accuracy, and convenient maintenance. It greatly reduces the operating cost for situations requiring multiple weighing and batching. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the powder pneumatic conveying, weighing and batching system of this utility model.

[0014] Figure 2 This is a structural diagram of the unloading valve of this utility model in the unloading state.

[0015] Figure 3 This is a schematic diagram of the unloading valve in the closed state of this utility model.

[0016] Figure 4 This is a circuit connection diagram of the powder pneumatic conveying, weighing, and batching system of this utility model. Detailed Implementation

[0017] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by directional terms such as "inner" and "outer", "upper" and "lower", "front" and "back" is usually based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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. Therefore, they should not be construed as limiting the scope of protection of this utility model.

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0019] Example 1 like Figures 1-4 A powder pneumatic conveying, weighing and batching system includes a hopper 4, a weighing sensor 5 and a control system. A discharge valve 1 is provided on the top of the hopper 4, and flexible connection components are provided on both sides of the discharge valve 1. The discharge valve 1 is connected to an air compressor. The bottom of the hopper 4 is connected to the small cone hopper 7 via a pneumatic butterfly valve 6. A third flexible connection 8 is provided at the bottom of the small cone hopper 7, and this third flexible connection 8 is connected to a blower via a pipe. A vent 9 is provided on the side wall of the small cone hopper 7. Figure 4 As shown, the control system is electrically connected to the unloading valve 1, the weighing sensor 5, and the pneumatic butterfly valve 6. The control system includes an electrical control cabinet and a PLC controller. The unloading valve 1, the weighing sensor 5, and the pneumatic butterfly valve 6 are all connected through the electrical control cabinet and the PLC controller.

[0020] When weighing and batching are required, the PLC controller controls the sealing orifice 14 of the unloading valve 1 to be perpendicular to the inlet. Material a encounters the baffle, and powder b (flour) separates from the air due to resistance and enters the hopper 4. When the weight of the powder in the hopper 4 reaches the target value, the weighing sensor 5 sends a feedback signal to the PLC controller. The PLC controller controls the sealing orifice 14 of the unloading valve 1 to align with the inlet. The PLC controller controls the pneumatic butterfly valve 6 to open. The third flexible connection 8 connects to the external pipeline, which is under negative pressure. The external pipeline is connected to a blower to create a vacuum. Due to the pressure difference, external air enters the small cone hopper 6 from the breather 9 and then flows to the third flexible connection 8. Powder b in the hopper 4 is discharged from the outlet flexible connection 8 under the influence of the airflow. After the powder b in the hopper 4 is emptied, the weighing sensor 5 sends a feedback signal to the PLC controller, which then controls the pneumatic butterfly valve 6 to close.

[0021] The flexible connection assembly includes a first flexible connection 2 and a second flexible connection 3, which are respectively located on both sides of the discharge valve 1; the discharge valve 1 includes a pneumatic actuator 11, a housing 12, a material baffle 13, and a sealing through-hole device 14. The pneumatic actuator 11 is installed on the top of the housing 12. The pneumatic actuator 11 is a 90° pneumatic actuator. The rotating shaft of the pneumatic actuator 11 extends into the housing 12 and is connected to the outer wall of the sealing through-hole device 14; one end of the pneumatic actuator 11 is connected to an air compressor.

[0022] The outer walls of the material baffle 13 and the sealing through-hole device 14 are connected by clamps. The sealing through-hole device includes a material pipe and polytetrafluoroethylene (PTFE) layers on both sides of the material pipe. The PTFE layers on both sides of the sealing through-hole device are attached to the inner wall of the shell. The material pipe is a circular pipe with openings on both sides. The powder pneumatic conveying and weighing batching system also includes a support 10. The support 10 includes multiple support legs and a fixed frame set between the multiple support legs. The hopper 4 is set on the fixed frame. A weighing sensor 5 is set on the top of each support leg. The lower part of the hopper 4 and the small cone hopper 7 are both cone structures. The breather 9 is a filter element. The first flexible connection 2, the second flexible connection 3 and the third flexible connection 8 are all food-grade silicone tubes. All components in the powder pneumatic conveying and weighing batching system that come into contact with the material are made of stainless steel and are internally polished to food grade.

[0023] The working process of this utility model is as follows: During pneumatic conveying of powder, when weighing and batching are not required, such as... Figure 3 As shown, the control system controls the start of the discharge valve 1, and the sealing through-hole 14 of the discharge valve 1 is aligned with the first flexible connection 2 at the inlet, and the material a flows from the inlet to the second flexible connection 3 at the outlet.

[0024] When it is necessary to weigh the ingredients, such as Figure 2As shown, the sealing orifice 14 of the discharge valve 1 is perpendicular to the inlet, and the material baffle 13 blocks the inlet direction. The bottom pneumatic butterfly valve 6 is in the closed state. Material a (flour + air) encounters the baffle, and powder b (flour) separates from the air due to resistance and enters the hopper 4. Dust-laden air c is discharged from the second flexible connection 3, so as not to affect the continuous operation of the front-end equipment. When the weight of the powder in the hopper 4 reaches the target value, the weighing sensor 5 feeds back a signal, the sealing orifice 14 of the discharge valve 1 aligns with the inlet, the pneumatic butterfly valve 6 opens, and the third flexible connection 8 connects to the external pipeline. The external pipeline is in a negative pressure state and is connected to a blower to draw a vacuum. Due to the pressure difference, external air enters the small cone through the breather 9. The powder b in hopper 4 flows to the third flexible connection 8. Under the influence of the airflow, the powder b in hopper 4 is discharged from the outlet flexible connection 8. After the powder b in hopper 4 is emptied, the weighing sensor 5 sends a feedback signal, and the pneumatic butterfly valve 6 closes. Because the lower part of hopper 4 adopts a conical structure, the powder material is easy to empty, and there are almost no dead corners inside hopper 4. Therefore, the weighed weight is basically the same as the actual discharged weight. This effectively avoids the impact of the error between the weighed weight and the actual discharged weight on the weighing accuracy. Since the equipment uses pneumatic conveying, it is very suitable for long-distance conveying. Moreover, the equipment has a simple structure, low cost, and convenient maintenance. It greatly reduces the operating cost for situations that require multiple weighing and batching.

[0025] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A powder pneumatic conveying, weighing, and batching system, characterized in that, It includes a hopper (4), a weighing sensor (5) and a control system. The top of the hopper (4) is provided with a discharge valve (1), and soft connection components are provided on both sides of the discharge valve (1). The discharge valve (1) is connected to an air compressor. The bottom of the hopper (4) is connected to the small cone hopper (7) via a pneumatic butterfly valve (6). The bottom of the small cone hopper (7) is provided with a third flexible connection (8). The third flexible connection (8) is connected to a blower via a pipe. The side wall of the small cone hopper (7) is provided with a vent (9). The control system is electrically connected to the unloading valve (1), the weighing sensor (5), and the pneumatic butterfly valve (6).

2. The powder pneumatic conveying, weighing, and batching system according to claim 1, characterized in that, The flexible connection assembly includes a first flexible connection (2) and a second flexible connection (3), which are respectively located on both sides of the discharge valve (1).

3. The powder pneumatic conveying, weighing, and batching system according to claim 1, characterized in that, The unloading valve (1) includes a pneumatic actuator (11), a housing (12), a material baffle (13), and a sealing through hole (14). The pneumatic actuator (11) is installed on the top of the housing (12). The rotating shaft of the pneumatic actuator (11) extends into the housing (12) and is connected to the outer wall of the sealing through hole (14). One end of the pneumatic actuator (11) is connected to an air compressor. The pneumatic actuator (11) is connected to a control system.

4. The powder pneumatic conveying, weighing, and batching system according to claim 3, characterized in that, The outer walls of the material baffle (13) and the sealing through hole device (14) are connected by clamps. The sealing through hole device (14) includes a material pipe and polytetrafluoroethylene layers disposed on both sides of the material pipe. The polytetrafluoroethylene layers on both sides of the sealing through hole device (14) are attached to the inner wall of the shell (12).

5. The powder pneumatic conveying, weighing, and batching system according to claim 1, characterized in that, The powder pneumatic conveying and weighing batching system also includes a support (10), which includes multiple support legs and a fixed frame set between the multiple support legs. The hopper (4) is set on the fixed frame, and a weighing sensor (5) is set on the top of each support leg.

6. The powder pneumatic conveying, weighing, and batching system according to claim 1, characterized in that, The lower part of the hopper (4) and the small cone hopper (7) are both cone structures.

7. The powder pneumatic conveying, weighing, and batching system according to claim 1, characterized in that, The breathing port (9) is a filter element.

8. The powder pneumatic conveying, weighing, and batching system according to claim 2, characterized in that, The first flexible connector (2), the second flexible connector (3) and the third flexible connector (8) are all food-grade silicone tubes.

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