A pre-clogging warning device for the return sand pipeline of the pre-blasting room in a painting line
By installing a detection connector and pressure sensor on the sand return pipe of the sandblasting room, the problem of blockage in the pneumatic sand return pipe is solved, ensuring efficient operation.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU SHANMIAO ENVIRONMENTAL ENG CO LTD
- Filing Date
- 2025-08-18
- Publication Date
- 2026-07-03
AI Technical Summary
Modern pneumatic sand return pipes are prone to clogging in sandblasting rooms, preventing sand from being collected and affecting work efficiency.
Design a blockage warning device for the return sand pipeline of the pre-blasting room in a coating line. By installing first and second detection connectors at the beginning and end of the return sand pipeline and equipping them with pressure sensors, the device can monitor the pressure difference fluctuations in the pipeline in real time and provide early warning of blockage.
It enables precise early warning of blockages, allowing operators to clear them in a timely manner, ensuring sand return efficiency and avoiding production interruptions.
Smart Images
Figure CN224445636U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of sandblasting room technology, specifically to an early warning device for blockage of the return sand pipeline in the pre-sandblasting room of a coating line. Background Technology
[0002] Sandblasting booths are used in the pre-processing of coating lines, mainly for surface treatment of workpieces. After sandblasting, rust on the workpiece surface can be removed, facilitating further coating work. Sandblasting booths, also called shot blasting booths or sandblasting rooms, are suitable for cleaning and removing rust from the surfaces of large workpieces, increasing the adhesion between the workpiece and the coating. Based on the abrasive recovery method, shot blasting booths are divided into: mechanical recovery shot blasting booths, manual recovery shot blasting booths, and pneumatic recovery shot blasting booths. Pneumatic recovery shot blasting booths are more widely used. They use the suction of a fan to recover abrasive material through a return pipe. However, modern pneumatic return pipes are prone to clogging. Often, the blockage becomes so severe that operators only notice when abrasive material cannot be collected, affecting work efficiency. Utility Model Content
[0003] The problem this invention addresses is that modern pneumatic sand return pipes often become clogged, and operators only notice when the blockage becomes severe and sand cannot be collected, affecting work efficiency. This invention provides an early warning device for blockages in the sand return pipes of the pre-blasting room in a coating line.
[0004] This utility model is achieved through the following technical solution: a device for early warning of blockage in the return sand pipeline of the pre-blasting room in a coating line, comprising:
[0005] A sand return pipe, located at the bottom of the sandblasting chamber;
[0006] Multiple material discharge hoppers are provided and installed side by side above the sand return pipe;
[0007] The material discharge pipe is provided in multiple ways. The upper end of each material discharge pipe is connected to the bottom of a material discharge hopper, and the lower end of each material discharge pipe is inserted into a sand return pipe.
[0008] The first inspection connector is installed on the return sand pipe and is located to the left of the leftmost material drop pipe;
[0009] The second inspection connector is installed on the return sand pipe and is located to the right of the rightmost material drop pipe;
[0010] The first pressure sensor is installed on the first detection connector;
[0011] The second pressure sensor is installed on the second detection connector.
[0012] Furthermore, the discharge hopper is an inverted quadrangular pyramid shape, with the bottom edges of two adjacent discharge hoppers touching.
[0013] Furthermore, the material discharge pipe is vertical and is positioned off-center from the centerline of the return sand pipe.
[0014] Furthermore, the distance from the axis of the discharge pipe to the center line of the return sand pipe is 25% of the inner diameter of the return sand pipe.
[0015] Furthermore, the lower opening of the material discharge pipe is at the same height as the center line of the sand return pipe.
[0016] Furthermore, the first and second detection connectors are horizontally positioned, both located on the same side of the return sand pipe and on the side away from the discharge pipe.
[0017] Furthermore, the heights of the first and second inspection connectors are consistent with the height of the centerline of the return sand pipe.
[0018] Furthermore, the heights of the first and second detection connectors are tangent to the top of the return sand pipe.
[0019] Furthermore, the first pressure sensor and the second pressure sensor constitute a differential pressure transmitter.
[0020] The beneficial effects of this utility model are:
[0021] The present invention provides an early warning device for blockage in the return sand pipe of the pre-blasting room of the coating line. By monitoring the pressure difference fluctuation between the beginning and end of the return sand pipe, namely the first detection connector and the second detection connector, it can provide real-time and accurate early warning of blockage at the material drop pipe, allowing operators to clean it before the blockage seriously affects the return sand efficiency, thus ensuring efficient operation. Attached Figure Description
[0022] Figure 1 This is a front view of a device for early warning of blockage in the return sand pipeline of a pre-blasting room in a painting line, as described in Embodiment 1.
[0023] Figure 2 This is a top view of an early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line, as described in Embodiment 1.
[0024] Figure 3 This is a left view of an early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line, as described in Embodiment 1.
[0025] Figure 4 This is a left view of an early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line, as described in Embodiment 1.
[0026] In the diagram: 1. Return sand pipe; 2. Feed hopper; 3. Feed pipe; 4. First detection connector; 5. Second detection connector; 6. First pressure sensor; 7. Second pressure sensor. Detailed Implementation
[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0028] like Figure 1-3 As shown, a device for early warning of blockage in the return sand pipeline of the pre-blasting room in a painting line is described.
[0029] Includes a sand return pipe 1, which is located at the bottom of the sandblasting chamber;
[0030] Multiple material discharge hoppers 2 are provided and installed side by side above the sand return pipe 1;
[0031] The material discharge pipe 3 is provided in multiple ways. The upper end of each material discharge pipe 3 is connected to the bottom of a material discharge hopper 2, and the lower end of each material discharge pipe 3 is inserted into the sand return pipe 1.
[0032] The first inspection pipe 4 is installed on the return sand pipe 1 and is located to the left of the leftmost material drop pipe 3;
[0033] The second inspection pipe 5 is installed on the return sand pipe 1 and is located to the right of the rightmost material drop pipe 3;
[0034] The first pressure sensor 7 is installed on the first detection connector 4;
[0035] The second pressure sensor 7 is installed on the second detection connector 5.
[0036] In this scheme, when the entire return sand pipe 1 is unobstructed, the airflow carrying sand flows stably, and the pressure difference between the two ends of the return sand pipe 1, i.e., the pressure difference between the first detection connector 4 and the second detection connector 5, remains basically constant. When sand or foreign objects accumulate and block the material drop pipe 3, the flow resistance in that local area increases, causing a significant change in the airflow pressure distribution within the return sand pipe 1, which in turn causes abnormal fluctuations in the pressure difference between the first detection connector 4 and the second detection connector 5. By monitoring the pressure difference changes detected by the first pressure sensor 7 and the second pressure sensor 8, the changes in the overall flow resistance state of the return sand pipe 1 can be sensed in real time, accurately predicting blockages at the material drop pipe 3. This allows operators to intervene and clear the blockage before it becomes severe and significantly affects the return sand efficiency, thereby ensuring high return sand efficiency and avoiding production interruptions due to severe blockages.
[0037] In practical applications, the discharge hopper 2 is an inverted square pyramid shape, with the base edges of adjacent discharge hoppers 2 touching. The inverted square pyramid shape facilitates the convergence and sliding of sand towards the discharge pipe 3 at the bottom, and the design of the base edges touching eliminates gaps between adjacent discharge hoppers 2. This structure effectively prevents sand from accumulating at the connection point of the discharge hoppers 2, ensuring that the sand flows smoothly and centrally into the discharge pipe 3, reducing the risk of material accumulation caused by the structure of the discharge hopper 2 itself, and reducing the possibility of blockage from the source.
[0038] In practical applications, the discharge pipe 3 is vertical and offset from the centerline of the return sand pipe 1. The vertical shape of the discharge pipe 3 ensures that the sand falls vertically. Offsetting it from the centerline of the return sand pipe 1 places the sand's entry point to one side of the centerline. This offset point reduces the risk of sand accumulating at the entry point due to a sudden decrease in kinetic energy. Simultaneously, the sideways airflow within the return sand pipe 1 more effectively entrains and carries away the sand, improving conveying efficiency and reducing the probability of initial blockage.
[0039] In practical applications, the distance from the axis of the discharge pipe 3 to the centerline of the return sand pipe 1 is 25% of the inner diameter of the return sand pipe 1. This specific offset optimizes the relationship between the sand drop point and the core area of the high-speed airflow, avoiding strong rebound and accumulation caused by the sand flow directly hitting the center of the pipe bottom, while ensuring that the sand falls into a sufficiently strong airflow shearing zone, ensuring that the sand is quickly and effectively entrained into the main airflow, achieving efficient transportation and minimizing initial deposition near the discharge port.
[0040] In practical applications, the lower opening of the material drop pipe 3 is positioned at the same height as the centerline of the return sand pipe 1. This allows the sand to fall directly into the vicinity of the central area of the return sand pipe 1, where the airflow velocity is relatively high and the distribution is more uniform. This facilitates the rapid capture and horizontal transport of the sand by the high-speed airflow, improving the efficiency and smoothness of the sand entering the main airflow.
[0041] In practical applications, the first detection connector 4 and the second detection connector 5 are horizontally positioned, both located on the same side of the return sand pipe 1 and away from the material drop pipe 3. This ensures that the pressure measurement direction is perpendicular to the airflow direction, thus obtaining static pressure. Being located on the same side of the return sand pipe 1, away from the insertion side of the material drop pipe 3, avoids the area where sand directly falls and impacts the pressure. This ensures accurate pressure measurement; being on the same side away from the material drop point avoids interference from sand flow impact and local eddies on pressure measurement, ensuring that the obtained static pressure value more accurately represents the true average pressure of the return sand pipe 1 at that cross-section, improving the stability and reliability of differential pressure detection, and reducing false alarms.
[0042] In practical applications, the heights of the first detection connector 4 and the second detection connector 5 are consistent with the height of the centerline of the return sand pipe 1. Measuring pressure at this height best reflects the average dynamic pressure of the airflow within the return sand pipe 1 (dynamic pressure + static pressure), and the sand concentration distribution at this location is typically more representative. When blockage causes changes in flow resistance, the pressure change at the centerline height is the most significant and sensitive, facilitating the timely capture of differential pressure fluctuation signals.
[0043] In practical applications, the first pressure sensor 7 and the second pressure sensor 7 form a differential pressure transmitter. The differential pressure transmitter directly outputs the differential pressure signal between the two points, which is more accurate, faster in response, and stronger in anti-interference capability than using two independent pressure sensors to calculate the difference (such as the effect of atmospheric pressure fluctuations being canceled out). This significantly improves the sensitivity and accuracy of blockage early warning and simplifies signal processing and judgment logic.
[0044] Example 2, as Figure 4 The difference from Embodiment 1 is that the heights of the first detection connector 4 and the second detection connector 5 are tangent to the top of the sand return pipe 1. This location typically has a lower sand concentration and relatively cleaner airflow, reducing the risk of sand particles entering the pressure measuring pipe or abrading the pressure measuring port. Although the absolute pressure value may differ from the centerline, as a differential pressure measurement between two points, as long as the installation positions are consistent, it can still effectively monitor overall differential pressure fluctuations caused by blockages, while also improving the durability of the sensor interface.
[0045] In summary, the present invention provides an early warning device for blockage of the return sand pipe 1 in a sandblasting room. By monitoring the pressure difference fluctuation between the beginning and end of the return sand pipe 1, namely the first detection connector 4 and the second detection connector 5, it can provide real-time and accurate early warning of blockage at the material drop pipe 3, allowing operators to clear the blockage before it seriously affects the return sand efficiency, thus ensuring efficient operation.
[0046] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that the above embodiments are only for illustrating the technical concept and characteristics of this utility model, and are intended to enable those skilled in the art to understand and implement the content of this utility model. They should not be used to limit the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the scope of protection of this utility model.
Claims
1. A device for early warning of blockage in the return sand pipeline of the pre-blasting booth in a coating line, characterized in that: include: Sand return pipe (1), which is located at the bottom of the sandblasting room; Multiple material discharge hoppers (2) are provided and installed side by side above the return sand pipe (1); The material discharge pipe (3) is provided in multiple ways. The upper end of each material discharge pipe (3) is connected to the bottom of a material discharge hopper (2), and the lower end of each material discharge pipe (3) is inserted into the sand return pipe (1). The first inspection pipe (4) is installed on the return sand pipe (1) and is located to the left of the leftmost drop pipe (3); The second inspection pipe (5) is installed on the return sand pipe (1) and is located to the right of the rightmost drop pipe (3); The first pressure sensor (6) is installed on the first detection connector (4); The second pressure sensor (7) is installed on the second detection connector (5).
2. The early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line according to claim 1, characterized in that: The discharge hopper (2) is an inverted quadrangular pyramid shape, with the bottom edges of two adjacent discharge hoppers (2) touching.
3. The early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line according to claim 1, characterized in that: The material drop pipe (3) is vertical and is set off from the center line of the return sand pipe (1).
4. The early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line according to claim 3, characterized in that: The distance from the axis of the discharge pipe (3) to the center line of the return sand pipe (1) is 25% of the inner diameter of the return sand pipe (1).
5. The early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line according to claim 3, characterized in that: The lower end of the material drop pipe (3) is at the same height as the center line of the return sand pipe (1).
6. The early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line according to claim 3, characterized in that: The first detection connector (4) and the second detection connector (5) are set horizontally. The first detection connector (4) and the second detection connector (5) are both located on the same side of the return sand pipe (1) and are both located on the side away from the material drop pipe (3).
7. The early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line according to claim 3, characterized in that: The height of the first detection connector (4) and the second detection connector (5) is consistent with the height of the center line of the return sand pipe (1).
8. The early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line according to claim 3, characterized in that: The heights of the first detection connector (4) and the second detection connector (5) are tangent to the top of the return sand pipe (1).
9. The early warning device for blockage of the return sand pipeline in the pre-blasting room of a coating line according to claim 1, characterized in that: The first pressure sensor (6) and the second pressure sensor (7) are a set of differential pressure transmitters.