An online powder coating detection system

Abstract

The utility model discloses a kind of powder coating online detection systems, including sampling pipeline;Screening device, screening device has screen and hopper, screen is set in the upper end of hopper, and the lower discharge end of sampling pipeline;Weighing calculator, weighing calculator includes first pressure sensor and second pressure sensor, first pressure sensor is set between screen and hopper, to weigh the unqualified powder coating retained on screen, second pressure sensor is set below hopper, to weigh the total powder coating in hopper and on screen.The utility model directly screens and separates qualified and unqualified powder coating in sample after intercepting part of powder coating on production line, and simultaneously weighs the weight of unqualified powder coating and total sample weight, to quickly calculate and obtain the proportion of unqualified powder coating, realize the rapid online quality detection of powder coating.

Description

Technical Field

[0001] This utility model relates to the field of powder coating testing technology, specifically to an online powder coating testing system. Background Technology

[0002] Powder coating is a solvent-free solid coating that cures by baking at high temperatures after spraying. Powder coatings are typically made by mixing and grinding organic raw materials in a specific ratio. The particle size of the powder must meet certain requirements; excessively large particle sizes will affect the quality of the powder coating.

[0003] Currently, to test the quality of powder coating production, a certain amount of powder coating is typically sampled from the main conveying pipeline by manually opening and closing multi-channel valves in the pneumatic conveying line. The sample is then weighed, its weight recorded, and then sieved to remove substandard particles. The weight of the substandard powder coating on the sieving component is then weighed and recorded, and the percentage of substandard powder coating weight relative to the total sample weight is calculated and compared to the production requirements to determine if the powder coating production quality meets the standards. While this method allows for precise weighing and calculation to analyze powder coating quality, the process is cumbersome and time-consuming. It requires periodic manual sampling from the main line via valves, followed by manual sample transfer, sieving, and measurement. This makes it difficult to quickly calculate and analyze the quality of the powder coating conveyed in the production line. Consequently, when substandard results are found, the excessive time spent on adjustments prevents timely shutdowns, resulting in a large quantity of substandard powder coating and complicating secondary processing.

[0004] Therefore, the existing method of manually sampling online, weighing before sieving, weighing after sieving, and calculating to analyze and detect the quality of powder coatings requires a lot of time due to the many steps involved in manual operation. As a result, after the quality is found to be substandard, the production line continues to operate, producing a large number of unqualified powder coatings, which increases the difficulty of secondary processing. Utility Model Content

[0005] The purpose of this invention is to provide an online powder coating testing system to solve the technical problem in the prior art where the manual operation requires many steps and takes a long time, resulting in a large number of unqualified powder coatings being produced as the production line continues to operate after the quality is found to be substandard, thus affecting the difficulty of secondary processing.

[0006] To solve the above-mentioned technical problems, this utility model specifically provides the following technical solution:

[0007] An online powder coating inspection system, comprising:

[0008] Sampling pipelines are used to periodically extract a certain amount of powder coating from the production line;

[0009] A sieve, comprising a screen and a hopper, wherein the screen is disposed at the upper end of the hopper and at the lower discharge end of the sampling pipeline, for receiving and sieving the sampled powder coating, retaining unqualified powder coating and allowing qualified powder coating to leak into the hopper;

[0010] The weighing calculator includes a first pressure sensor and a second pressure sensor. The first pressure sensor is disposed between the screen and the hopper to weigh the unqualified powder coating retained on the screen. The second pressure sensor is disposed below the hopper to weigh the total powder coating in the hopper and on the screen.

[0011] The weighing calculator weighs the powder coating after the sieving process is completed, and calculates the weighing values ​​of the first pressure sensor and the second pressure sensor to obtain the percentage of unqualified powder coating to the total powder coating. The weight is then compared with a preset threshold to determine whether the powder coating is qualified, thus realizing online quality detection of the powder coating.

[0012] As a preferred embodiment of this utility model, the sampling pipeline includes a flexible hose, the outlet end of which is connected to the inlet of the screen, and the inlet end of the flexible hose is provided with a three-way valve. The other two ends of the three-way valve are respectively connected to the pneumatic conveying pipeline for sampling and to the waste discharge pipeline for waste discharge.

[0013] As a preferred embodiment of this utility model, the screen includes an upper cover, the inlet of the upper cover is connected to the outlet of the hose, and the outlet of the upper cover is provided with an arc-shaped mesh, which is bent downwards.

[0014] As a preferred embodiment of the present invention, the hopper includes a hopper body, and the feed inlet of the hopper body is installed at the bottom of the upper cover body so that the arc-shaped mesh is fitted inside the feed inlet of the hopper body;

[0015] A vibrator is provided on the bucket body, and the vibrator is used to vibrate the bucket body, the upper cover and the arc-shaped net at a set time.

[0016] The bottom of the bucket is connected to an air pump via a hose and a valve, so that after the test is completed, air is pumped into the bucket and discharged in the reverse direction.

[0017] In a preferred embodiment of this utility model, there are multiple first pressure sensors, which are evenly distributed around the axis of the screen. The weighing calculator calculates the average value of the multiple first pressure sensors as the weight of the retained unqualified powder coating.

[0018] As a preferred embodiment of this utility model, there are multiple second pressure sensors, which are arranged around the external support of the hopper to support the screen, the hopper and the first pressure sensor;

[0019] A shock-absorbing bracket is provided at the bottom of multiple second pressure sensors. The shock-absorbing bracket is used to install the screen, the hopper, the first pressure sensor and the second pressure sensor on the production line and reduce vibration transmission.

[0020] Compared with the prior art, this utility model has the following advantages:

[0021] This invention involves taking a portion of powder coating from the production line, directly sieving and separating qualified and unqualified powder coatings from the sample, and simultaneously weighing the weight of the unqualified powder coatings and the total sample weight to quickly calculate the percentage of unqualified powder coatings, thus achieving rapid online quality detection of powder coatings. Attached Figure Description

[0022] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of an online powder coating detection system is provided for embodiments of this utility model.

[0024] The labels in the diagram represent the following:

[0025] 1-Sampling pipeline; 2-Sieve separator; 3-Weighing calculator; 4-Shock absorber bracket;

[0026] 11-Hose; 12-Three-way valve; 21-Screen; 22-Hopper; 31-First pressure sensor; 32-Second pressure sensor;

[0027] 211-Upper cover; 212-Arc-shaped net; 221-Bucket body; 222-Vibrator. Detailed Implementation

[0028] 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.

[0029] like Figure 1 As shown, this utility model provides an online powder coating testing system, comprising:

[0030] Sampling pipeline 1 is used to periodically extract a certain amount of powder coating from the production line;

[0031] The sieve 2 has a screen 21 and a hopper 22. The screen 21 is located at the upper end of the hopper 22 and at the lower discharge end of the sampling pipe 1 to collect and screen the sampled powder coating, retain unqualified powder coating and let qualified powder coating leak into the hopper 22.

[0032] Weighing calculator 3 includes a first pressure sensor 31 and a second pressure sensor 32. The first pressure sensor 31 is disposed between the screen 21 and the hopper 22 to weigh the unqualified powder coating retained on the screen 21. The second pressure sensor 32 is disposed below the hopper 22 to weigh the total powder coating in the hopper 22 and on the screen 21.

[0033] The weighing calculator 3 weighs the powder coating after the sieve 2 finishes sieving, and calculates the weighing values ​​of the first pressure sensor 31 and the second pressure sensor 32 to obtain the percentage of unqualified powder coating to the total powder coating. It then compares the result with a preset threshold to determine whether the powder coating is qualified, thus realizing online quality detection of the powder coating.

[0034] This invention mainly involves taking a portion of powder coating from the production line, separating qualified and unqualified powder coating from the sample through sieving, and then simultaneously weighing the weight of the unqualified powder coating and the total sample weight to quickly calculate the percentage of unqualified powder coating, thus achieving rapid online quality detection of powder coating.

[0035] Specifically, after a certain amount of powder coating is collected in the sampling pipeline 1, the powder coating is discharged into the sieve 21. The sieve 21 separates the unqualified powder coating, while the qualified powder coating leaks into the hopper 22. Since the weighing calculator 3 is divided into a first pressure sensor 31 and a second pressure sensor 32, and the first pressure sensor 31 is dedicated to weighing the sieve 21, the weight of the unqualified powder coating is obtained after removing the weight of the sieve 21 (equivalent to "tare"). The second pressure sensor 32 is used to weigh the sieve 21, the first pressure sensor 31, and the hopper 221, so the weight of the total sample is obtained after removing the weight of the sieve 21, the first pressure sensor 31, and the hopper 221. The weighing calculator 3 can directly obtain the percentage of unqualified powder coating by comparing the measured value of the first pressure sensor 31 with the measured value of the second pressure sensor 32.

[0036] Compared to existing methods involving manual sampling, pre-weighing, sieving, post-weighing, and calculation, this online detection system directly sieves the sample after sampling and simultaneously weighs the weight of substandard powder coatings and the total sample weight. This allows for rapid calculation of the percentage of substandard powder coatings, enabling faster comparison with production requirements to analyze the production quality of powder coatings. This effectively shortens the time required for online quality detection, thereby reducing the output of substandard products after obtaining results indicating non-compliance and lowering the difficulty of secondary processing.

[0037] The powder coating online detection system also has corresponding computing and control equipment such as a host computer. The host computer is mainly used to analyze the calculation results and production requirement thresholds, as well as control the actions of various parts. This is a commonly used equipment for production line control and detection, and is not the focus of this utility model. Therefore, it will not be described in detail.

[0038] Sampling line 1 is used to extract a portion of powder coating from the pneumatic conveying line, but sampling line 1 should not interfere with the operation of sieve 2. Therefore, the following preferred embodiment is provided.

[0039] like Figure 1 As shown, the sampling pipeline 1 includes a flexible hose 11. The outlet end of the flexible hose 11 is connected to the inlet of the screen 21. A three-way valve 12 is provided at the inlet end of the flexible hose 11. The other two ends of the three-way valve 12 are respectively connected to the pneumatic conveying pipeline for sampling and to the waste discharge pipeline for waste discharge.

[0040] In this embodiment, the part connecting the sampling pipeline 1 and the screen 21 is a flexible hose 11. The flexible hose 11 can avoid affecting the vibration of the screen 2 and can also effectively prevent the vibration of the screen 2 from being transmitted to the pneumatic conveying pipeline.

[0041] The hose 11 can also be weighed by the first pressure sensor 31 and the second pressure sensor 32, thereby achieving the "tapering" process of the hose 11. That is, when no sample is taken, the values ​​of the first pressure sensor 31 and the second pressure sensor 32 are set to zero.

[0042] The three-way valve 12, which connects to the flexible hose 11, has one end connected to the pneumatic conveying pipeline. When switching this channel, some of the powder coating in the pneumatic conveying pipeline can leak into the flexible hose 11, thus entering the sieve 21 for sampling. The other end is connected to the waste discharge pipeline. After weighing and calculation, for unqualified samples, this channel is switched, and the powder coating on the sieve 21 and in the hopper 22 is transported to the waste discharge pipeline for waste discharge via reverse airflow.

[0043] Therefore, for qualified powder coatings, they can be returned to the pneumatic conveying pipeline by using a reverse airflow connection to the port of the three-way valve 12 connected to the pneumatic conveying pipeline. Specifically:

[0044] like Figure 1As shown, the screen 21 includes an upper cover 211, the inlet of the upper cover 211 is connected to the outlet of the hose 11, and the outlet of the upper cover 211 is provided with an arc-shaped mesh 212, which is bent downwards.

[0045] The upper cover 211 seals the connection hose 11 to prevent powder coating sampling from spilling, while the curved mesh 212 bends to provide a larger capacity, thereby enabling the collection of a relatively large amount of powder coating, increasing the amount of sample collected and improving the accuracy of the test.

[0046] like Figure 1 As shown, the hopper 22 includes a hopper body 221, and the feed inlet of the hopper body 221 is installed at the bottom of the upper cover 211 so that the arc-shaped mesh 212 is fitted inside the feed inlet of the hopper body 221.

[0047] A vibrator 222 is provided on the bucket body 221. The vibrator 222 is used to vibrate the bucket body 221, the upper cover 211 and the arc net 212 at a set time.

[0048] The bottom of the bucket 221 is connected to an air pump via a hose and a valve, so that after the test is completed, air is pumped into the bucket 221 and discharged in the reverse direction.

[0049] The bucket body 221 is connected to the upper cover body 211, and the arc-shaped mesh 212 is fitted inside it to prevent the powder coating from overflowing. The vibrator 222 is set on the bucket body 211, which can effectively lower the center of gravity of the equipment, thereby avoiding the instability caused by the center of gravity being too high and difficult to install.

[0050] Furthermore, the hose and air pump at the bottom of the bucket 211 can generate a reverse airflow after the weighing calculation is completed, thereby allowing the qualified powder coating to pass back through the arc-shaped mesh 212. Since the arc surface of the arc mesh 212 faces the reverse airflow, it can quickly disperse a larger amount of qualified powder coating throughout the entire arc mesh 212, effectively improving the powder coating return speed.

[0051] Among them, the air pump, hose and valve are all existing conventional pneumatic conveying equipment components, and their working principle is also conventional air pumping. The figure does not show them all, so they will not be described in detail.

[0052] Of course, in order to ensure the accuracy of the measurements by the first pressure sensor 31 and the second pressure sensor 32, the following preferred embodiments are provided.

[0053] like Figure 1 As shown, there are multiple first pressure sensors 31, which are evenly distributed around the axis of the screen 21 to support the screen 21. The weighing calculator 3 calculates the average value of the multiple first pressure sensors 31 as the weight of the retained unqualified powder coating.

[0054] There are multiple second pressure sensors 32 arranged around the outer support of the hopper 22 to support the screen 21, the hopper 22 and the first pressure sensor 31. The weighing calculator 3 calculates the average value of the multiple second pressure sensors 32 as the total weight of the sample.

[0055] Specifically, both the first pressure sensor 31 and the second pressure sensor 32 employ multiple circumferentially arranged weighing methods, which can effectively improve the accuracy of weighing and make the support more stable.

[0056] Of course, since screener 2 needs to be supported and installed near the pneumatic conveying pipeline, and its vibrating screening cannot be affected, nor can the vibrating screening have a significant impact on other equipment, therefore, if Figure 1 As shown, a shock-absorbing bracket 4 is provided at the bottom of multiple second pressure sensors 32. The shock-absorbing bracket 4 is used to install the screen 21, hopper 22, first pressure sensor 31 and second pressure sensor 32 on the production line and reduce vibration transmission. The shock-absorbing bracket 4 can effectively absorb the mechanical vibration of the vibrator 222 and avoid interfering with surrounding equipment.

[0057] It should be noted that the start and stop of the three-way valve 12, valve, air pump, and vibrator 222 are all controlled by the main unit of the system. The control is as follows: first, the three-way valve 12 is opened for sampling at a set time, then the vibrator 22 is started for vibration separation at a set time, then the calculation is obtained by the weighing calculator 3, and finally the air pump and valve are started for backflushing.

[0058] The above embodiments are merely exemplary embodiments of this application and are not intended to limit this application. The scope of protection of this application is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to this application within its substance and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of this application.

Claims

1. An online detection system for powder coatings, characterized in that, include: Sampling pipeline (1) is used to periodically extract a certain amount of powder coating from the production line; The sieve (2) has a screen (21) and a hopper (22). The screen (21) is located at the upper end of the hopper (22) and at the lower discharge end of the sampling pipeline (1) to collect and screen the sampled powder coating, retain unqualified powder coating and let qualified powder coating leak into the hopper (22). Weighing calculator (3), the weighing calculator (3) includes a first pressure sensor (31) and a second pressure sensor (32), the first pressure sensor (31) is disposed between the screen (21) and the hopper (22) to weigh the unqualified powder coating retained on the screen (21), and the second pressure sensor (32) is disposed below the hopper (22) to weigh the total powder coating in the hopper (22) and on the screen (21); The weighing calculator (3) weighs the powder coating after the sieve (2) finishes sieving, and calculates the weighing values ​​of the first pressure sensor (31) and the second pressure sensor (32) to obtain the percentage of unqualified powder coatings in the total powder coatings, and compares it with a preset threshold to determine whether it is qualified, thereby realizing online quality detection of powder coatings.

2. The powder coating online detection system according to claim 1, characterized in that, The sampling pipeline (1) includes a hose (11), the outlet end of the hose (11) is connected to the inlet of the screen (21), the inlet end of the hose (11) is provided with a three-way valve (12), and the other two ends of the three-way valve (12) are respectively connected to the pneumatic conveying pipeline for sampling and to the waste discharge pipeline for waste discharge.

3. The powder coating online detection system according to claim 2, characterized in that, The screen (21) includes an upper cover (211), the inlet of which is connected to the outlet of the hose (11), and the outlet of the upper cover (211) is provided with an arc-shaped mesh (212), which is bent downwards.

4. The powder coating online detection system according to claim 3, characterized in that, The hopper (22) includes a hopper body (221), and the feed inlet of the hopper body (221) is installed at the bottom of the upper cover (211) so that the arc-shaped mesh (212) is fitted inside the feed inlet of the hopper body (221); A vibrator (222) is provided on the bucket body (221), and the vibrator (222) is used to vibrate the bucket body (221), the upper cover (211) and the arc-shaped net (212) at a set time. The bottom of the bucket (221) is connected to an air pump via a hose and a valve so that air is pumped into the bucket (221) and discharged in the reverse direction after the test is completed.

5. A powder coating online detection system according to any one of claims 1-4, characterized in that, The number of the first pressure sensors (31) is multiple and they are evenly distributed around the axis of the screen (21). The weighing calculator (3) calculates the average value of the multiple first pressure sensors (31) as the weight of the retained unqualified powder coating.

6. The powder coating online detection system according to claim 5, characterized in that, The second pressure sensor (32) is multiple and is arranged around the external support of the hopper (22) to support the screen (21), the hopper (22) and the first pressure sensor (31). A shock-absorbing bracket (4) is provided at the bottom of multiple second pressure sensors (32). The shock-absorbing bracket (4) is used to install the screen (21), the hopper (22), the first pressure sensor (31) and the second pressure sensor (32) on the production line and reduce vibration transmission.

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