A coating thickness monitoring device for spraying equipment and its usage method

Abstract

This invention provides a coating thickness monitoring device for spraying equipment and its usage method, relating to the field of spraying technology. It includes a base, a first monitoring mechanism mounted on the base, a monitoring rod contacting the top of the first monitoring mechanism, and an outer frame on the outer side of the top of the monitoring rod. The outer frame is fixedly connected to the base via a support rod. A coating component placement mechanism is provided inside the outer frame. The bottom of the coating component placement mechanism is fixedly connected to the monitoring rod. The first monitoring mechanism includes a mounting plate, and a first pressure sensor is mounted on the top of the mounting plate. Side limiting components are provided on both sides of the first pressure sensor. This invention, by setting up a first and a second monitoring mechanism, triggers an alarm by using a pressure sensor triggered by pressure. It can automatically trigger an alarm when the coating thickness reaches a certain level, thereby avoiding uneven coating due to uncontrollable coating thickness.

Description

Technical Field

[0001] This invention relates to the field of spraying technology, and in particular to a spraying thickness monitoring device for spraying equipment and its usage method. Background Technology

[0002] Spray painting is a method of applying paint to the surface of an object by dispersing it into uniform and fine droplets using a spray gun under air pressure. It can be categorized into air spray painting, airless spray painting, and electrostatic spray painting. Special attention should be paid to safety during spray painting to avoid inhalation and skin contact.

[0003] Most general spraying equipment cannot determine the thickness of the paint. Therefore, during the spraying process, the thickness of the paint is mostly observed by the naked eye, and the spraying angle is adjusted accordingly.

[0004] However, human visual observation is prone to bias. Furthermore, visual observation itself is inaccurate, and over a long period of time, eye fatigue can easily increase the error. Therefore, this invention proposes a spraying thickness monitoring device for spraying equipment and its usage method. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and to propose a spraying thickness monitoring device for spraying equipment and its usage method.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a spraying thickness monitoring device for spraying equipment, comprising a base, a first monitoring mechanism installed on the base, a monitoring rod contacting the top of the first monitoring mechanism, and an outer frame on the outer side of the top of the monitoring rod. The outer frame is fixedly connected to the base by a support rod. A spraying part placement mechanism is provided inside the outer frame. The bottom of the spraying part placement mechanism is fixedly connected to the monitoring rod.

[0007] The first monitoring mechanism includes a mounting plate, on the top of which a first pressure sensor is mounted. Side limiting members are provided on both sides of the first pressure sensor. Each side limiting member includes a housing. A groove is provided on the side of the housing near the monitoring rod. A connecting plate is provided in each groove of the housing. There are two connecting plates in each housing. The side of the connecting plates that is far apart from each other is fixedly connected to the inner wall of the housing by a first spring.

[0008] The monitoring rod includes a main rod body, a movable adjusting ball is provided in the middle of the main rod body, the main rod body is movably inserted into the movable adjusting ball, and a first hinge seat is installed on both sides of the bottom of the main rod body. A first control plate is rotatably connected to each of the first hinge seats, and the first control plate is correspondingly inserted into the outer shell.

[0009] Preferably, the sprayed part placement mechanism includes a fixing plate, the top of the fixing plate is provided with a fixing groove, the inner wall of the top of the fixing groove is fixed with an annular plate, the inner wall of the annular plate is fixed with a telescopic plate, four telescopic plates are provided, the output end of each telescopic plate is equipped with an electric push rod, and the bottom of each electric push rod is fixedly connected with a fixing suction cup.

[0010] The beneficial effect of adopting the above-mentioned further solution is that by designing a sprayed part placement mechanism, it is possible to easily fix sprayed parts of different sizes, so as to facilitate painting and monitoring of paint thickness.

[0011] Preferably, the bottom of the fixing plate is fixedly connected to the top of the main rod.

[0012] Preferably, the telescopic plate is divided into a main sleeve plate fixed to the inner wall of the annular plate and a telescopic sleeve plate movably inserted into the main sleeve plate. The telescopic sleeve plate and the main sleeve plate move with each other through a gas spring installed in the main sleeve plate.

[0013] The beneficial effect of adopting the above-mentioned further solution is that the telescopic plate uses a pneumatic rod as the output power, which makes it easy to control the extension and retraction of the telescopic plate.

[0014] Preferably, the bottom of the fixed plate is connected to the main rod body via a second monitoring mechanism. The second monitoring mechanism includes a connecting diagonal rod and a second hinge seat. The second hinge seat is installed at the bottom of the fixed plate. The connecting diagonal rod is rotatably connected to the second hinge seat. A limit plate is fixedly connected to the end of the connecting diagonal rod away from the second hinge seat. A second spring is fixedly connected to the top of the limit plate.

[0015] The beneficial effect of adopting the above-mentioned further solution is that by using the second monitoring mechanism as an intermediate transmission component, the device can be used more flexibly, and the thickness of paint can be monitored in different areas.

[0016] Preferably, the surface of the main rod above the movable adjusting ball is provided with a side limiting groove, and a second pressure sensor is installed at the bottom of the inner side limiting groove.

[0017] The beneficial effect of adopting the above-mentioned further solution is that the design of the second pressure sensor can monitor the force during painting in areas other than the center area of ​​the painted part, and thus calculate the thickness of the paint.

[0018] Preferably, the limiting plate is slidably inserted into the side limiting groove, the bottom of the limiting plate is directly above the second pressure sensor, and the end of the second spring away from the limiting plate is fixed to the inner top of the side limiting groove.

[0019] The beneficial effect of adopting the above-mentioned further solution is that the design of the limiting plate and the second spring can ensure that the fixing plate remains in a horizontal state under normal conditions.

[0020] Preferably, the outer frame includes an annular cylindrical shell and an annular groove formed on the inner wall of the annular cylindrical shell. The outer wall of the annular cylindrical shell is fixedly connected to the top of the base by a support rod. The fixing plate is movably inserted into the annular groove. An elastic soft pad is provided between the part of the fixing plate disposed inside the annular groove and the annular groove.

[0021] The beneficial effect of adopting the above-mentioned further solution is that the design of the elastic pad can provide a certain degree of support to keep the fixing plate horizontal.

[0022] Preferably, the middle part of the support rod near the movable adjusting ball is fixedly connected to the movable adjusting ball.

[0023] The beneficial effect of adopting the above-mentioned further solution is that the design of the movable adjustment ball allows the fixed plate to adjust its angle according to the direction of the force when the force is uneven.

[0024] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0025] 1. This invention, by setting up a first monitoring mechanism and a second monitoring mechanism, allows for the following: When painting the center of the part, a downward impact force is generated during the painting process, causing the fixing groove to move down a certain distance within the annular groove. The bottom of the main rod slowly moves down, generating pressure on the first pressure sensor below it. The first pressure sensor detects the pressure value, and when the pressure reaches a certain level, an alarm is triggered. The paint thickness can be automatically controlled by adjusting the alarm pressure value according to the required paint thickness. When painting the edge of the part, since the main rod is movably inserted into the movable adjusting ball, the connecting rod connected to the bottom of the fixing groove generates a downward pressure. This causes the limiting plate at one end of the connecting rod to slide within the side limiting groove until it touches the second pressure sensor, triggering an alarm. At this pressure level, it indicates that the paint thickness has reached a certain level. This method of monitoring the paint thickness allows for automatic alarm when the paint thickness reaches a certain level, thus avoiding uneven painting due to uncontrollable paint thickness.

[0026] 2. This invention also includes a sprayed part placement mechanism. A pneumatic rod drives a telescopic plate to extend and retract, thereby adjusting the position of the fixed suction cup until it is directly above the edge of the sprayed part. Then, an electric actuator is activated, causing the fixed suction cup to move downwards. The suction force and pressure of the fixed suction cup then fix the sprayed part onto the fixing groove, completing the fixation of the sprayed part. This design can fix sprayed parts of different sizes. Furthermore, the multi-point edge fixing method not only does not affect the spraying effect but also makes the fixation of the sprayed part more stable, integrating the sprayed part with the sprayed part placement mechanism. Attached Figure Description

[0027] Figure 1 This is an overall outer layer view of a spraying thickness monitoring device for spraying equipment according to the present invention;

[0028] Figure 2 This is a partial view of a spraying thickness monitoring device for a spraying equipment according to the present invention;

[0029] Figure 3 This is a connection structure diagram of the spraying part placement mechanism in a spraying thickness monitoring device for spraying equipment according to the present invention;

[0030] Figure 4 This is a top view of the external frame of a spray thickness monitoring device for spraying equipment according to the present invention;

[0031] Figure 5 This is an exploded view of the sprayed part placement mechanism in this invention;

[0032] Figure 6 This is a diagram showing the connection structure of the monitoring rod in this invention;

[0033] Figure 7 In this invention Figure 6 Enlarged view of point A;

[0034] Figure 8 This is a connection diagram of the monitoring rod and the first monitoring mechanism in a spraying thickness monitoring device for a spraying equipment according to the present invention;

[0035] Figure 9 In this invention Figure 8 Enlarged view of point B.

[0036] Legend:

[0037] 1. Base; 2. First monitoring mechanism; 3. Monitoring rod; 4. External frame; 5. Sprayed part placement mechanism; 6. Second monitoring mechanism; 7. Support rod; 21. Mounting plate; 22. First pressure sensor; 23. Side limiting component; 231. Housing; 232. Connecting plate; 233. First spring; 31. Main rod body; 32. Movable adjusting ball; 33. First hinge seat; 34. First control plate; 35. Side limiting groove; 36. Second pressure sensor; 41. Annular cylindrical shell; 42. Annular groove; 51. Fixing plate; 52. Fixing groove; 53. Annular plate; 54. Telescopic plate; 55. Electric push rod; 56. Fixed suction cup; 61. Connecting diagonal rod; 62. Second hinge seat; 63. Limiting plate; 64. Second spring. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0039] like Figure 1-9 As shown, the present invention provides a technical solution: a spraying thickness monitoring device for spraying equipment, including a base 1, a first monitoring mechanism 2 installed on the base 1, a monitoring rod 3 contacted above the first monitoring mechanism 2, and an outer frame 4 on the outer side of the top of the monitoring rod 3. The outer frame 4 is fixedly connected to the base 1 by a support rod 7. A spraying part placement mechanism 5 is provided inside the outer frame 4, and the bottom of the spraying part placement mechanism 5 is fixedly connected to the monitoring rod 3.

[0040] The first monitoring mechanism 2 includes a mounting plate 21. A first pressure sensor 22 is mounted on the top of the mounting plate 21. Side limiting members 23 are provided on both sides of the first pressure sensor 22. The side limiting members 23 include a housing 231. A groove is provided on the side of the housing 231 near the monitoring rod 3. A connecting plate 232 is provided in the groove of the housing 231. There are two connecting plates 232 in the housing 231. The side of the connecting plates 232 that is far apart from each other is fixedly connected to the inner wall of the housing 231 by a first spring 233.

[0041] The monitoring rod 3 includes a main rod body 31, a movable adjusting ball 32 is provided in the middle of the main rod body 31, the main rod body 31 is movably inserted into the movable adjusting ball 32, and a first hinge seat 33 is installed on both sides of the bottom of the main rod body 31. A first control plate 34 is rotatably connected to the first hinge seat 33, and the first control plate 34 is correspondingly inserted into the outer shell 231.

[0042] like Figure 5 As shown, the sprayed part placement mechanism 5 includes a fixing plate 51, a fixing groove 52 is provided on the top of the fixing plate 51, an annular plate 53 is fixed on the inner wall of the top of the fixing groove 52, and a telescopic plate 54 is fixed on the inner wall of the annular plate 53. There are four telescopic plates 54, and each telescopic plate 54 is equipped with an electric push rod 55 at its output end. Each electric push rod 55 is fixedly connected to a suction cup 56 at its bottom. By designing the sprayed part placement mechanism 5, it is possible to conveniently fix sprayed parts of different sizes, so as to facilitate painting and monitoring of paint thickness.

[0043] like Figure 3 As shown, the bottom of the fixing plate 51 is fixedly connected to the top of the main rod 31.

[0044] like Figure 5 As shown, the telescopic plate 54 is divided into a main sleeve plate fixed to the inner wall of the annular plate 53 and a telescopic sleeve plate movably inserted into the main sleeve plate. The telescopic sleeve plate and the main sleeve plate move through a pneumatic rod installed in the main sleeve plate. The telescopic plate 54 uses a pneumatic rod as the output power, which can facilitate the control of the telescopic plate 54's extension and retraction.

[0045] like Figure 5 As shown, the bottom of the fixed plate 51 is connected to the main rod 31 via a second monitoring mechanism 6. The second monitoring mechanism 6 includes a connecting diagonal rod 61 and a second hinge seat 62. The second hinge seat 62 is installed on the bottom of the fixed plate 51. The connecting diagonal rod 61 is rotatably connected to the second hinge seat 62. A limit plate 63 is fixedly connected to the end of the connecting diagonal rod 61 away from the second hinge seat 62. A second spring 64 is fixedly connected to the top of the limit plate 63. By using the second monitoring mechanism 6 as an intermediate transmission component, the device can be used more flexibly, and the thickness of paint spraying in different areas can be monitored.

[0046] like Figure 6-7 As shown, the main rod 31 above the movable adjusting ball 32 is provided with side limiting grooves 35. The bottom of the side limiting grooves 35 is equipped with a second pressure sensor 36. The design of the second pressure sensor 36 can monitor the force during painting in areas other than the center area of ​​the painted part, and then calculate the thickness of the paint.

[0047] like Figure 7 As shown, the limiting plate 63 is slidably inserted into the side limiting groove 35, and the bottom of the limiting plate 63 is directly above the second pressure sensor 36. The end of the second spring 64 away from the limiting plate 63 is fixed to the inner top of the side limiting groove 35. The design of the limiting plate 63 and the second spring 64 can ensure that the fixing plate 51 remains horizontal under normal conditions.

[0048] like Figure 4As shown, the outer frame 4 includes an annular cylindrical shell 41 and an annular groove 42 opened on the inner wall of the annular cylindrical shell 41. The outer wall of the annular cylindrical shell 41 is fixedly connected to the top of the base 1 by a support rod 7. The fixing plate 51 is movably inserted into the annular groove 42. The part of the fixing plate 51 located inside the annular groove 42 and the annular groove 42 are provided with elastic soft pads. The design of the elastic soft pads can provide a certain support for keeping the fixing plate 51 horizontal.

[0049] like Figure 1 As shown, the middle part of the support rod 7 is fixedly connected to the movable adjusting ball 32 at one end. The design of the movable adjusting ball 32 allows the fixed plate 51 to adjust its angle according to the direction of the force when the force is uneven.

[0050] Working principle:

[0051] S1. Installation of the sprayed parts: Place the five parts to be sprayed on the fixing groove 52. Then, turn on the air rod in the telescopic plate 54 to move the telescopic plate 54 to extend and retract, thereby adjusting the position of the fixing suction cup 56 until the fixing suction cup 56 is directly above the edge of the sprayed part. At this time, turn on the electric push rod 55 and use the electric push rod 55 to move the fixing suction cup 56 down. Thus, the sprayed part is fixed on the fixing groove 52 by the suction force and pressure of the fixing suction cup 56, and the fixing of the sprayed part is completed.

[0052] Using the fixing method in step S1, the telescopic plate 54 is extended and retracted by the air rod to adjust the position of the fixing suction cup 56 until the fixing suction cup 56 is directly above the edge of the sprayed part. Then, the electric push rod 55 is turned on, and the fixing suction cup 56 is moved down by the electric push rod 55. Thus, the sprayed part is fixed on the fixing groove 52 by the suction force and pressure of the fixing suction cup 56, and the fixing of the sprayed part is completed. This design can fix sprayed parts of different sizes. At the same time, the multi-point edge fixing method will not affect the spraying effect. In addition, the fixing of the sprayed part is more stable, so that the sprayed part and the sprayed part placement mechanism 5 are integrated.

[0053] S2. Spray painting operation: After the spray painting parts are fixed, place the external spray painting equipment above the fixing groove 52, and then use the spray painting equipment to spray paint the spray painting parts on the fixing groove 52.

[0054] S3. Thickness Detection: During the painting process, the paint thickness can be monitored through the first monitoring mechanism 2 and the second monitoring mechanism 6, as detailed below:

[0055] When painting is applied to the middle part of the part, a downward impact force is generated during the painting process, which causes the fixing groove 52 to move down a certain distance within the annular groove 42. At the same time, the bottom of the main rod 31 will slowly move down, generating pressure on the first pressure sensor 22 below it. The first pressure sensor 22 detects the pressure value. When the pressure reaches a certain level, an alarm will be triggered. The thickness of the paint can be automatically controlled by adjusting the alarm pressure value according to the required paint thickness.

[0056] When painting the edge of the part, since the main rod 31 is partially inserted into the movable adjusting ball 32 and the first adjusting plate 34 at the bottom of the main rod 31 is movably connected to the first hinge seat 33, when the edge of the part is subjected to force, the part and the fixing groove 52 will tilt. At this time, the connecting rod 61 connected to the bottom of the fixing groove 52 will generate a downward pressure, which will cause the limiting plate 63 at one end of the connecting rod 61 to slide in the side limiting groove 35 until it touches the second pressure sensor 36, thereby triggering an alarm. At this time, the pressure indicates that the paint thickness has reached a certain level.

[0057] Using the paint thickness monitoring method in step S3, when painting the center of the part, a downward impact force is generated during the painting process, causing the fixing groove 52 to move down a certain distance within the annular groove 42. This causes the bottom of the main rod 31 to slowly move down, generating pressure on the first pressure sensor 22 below it. The first pressure sensor 22 detects the pressure value, and when the pressure reaches a certain level, an alarm is triggered. The paint thickness is automatically controlled by adjusting the alarm pressure value according to the required paint thickness. When painting the edge of the part... During painting, since the main rod 31 is partially inserted into the movable adjusting ball 32, the connecting rod 61 connected to the bottom of the fixing groove 52 will generate a downward pressure. This causes the limiting plate 63 at one end of the connecting rod 61 to slide in the side limiting groove 35 until it touches the second pressure sensor 36, thereby triggering an alarm. At this pressure state, it indicates that the paint thickness has reached a certain level. By using this method to monitor the paint thickness, an alarm can be automatically triggered when the paint thickness reaches a certain level, thereby avoiding uneven painting due to the inability to control the paint thickness.

[0058] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A spray thickness monitoring device for a spray device, comprising a base (1), a first monitoring mechanism (2) mounted on the base (1), a monitoring rod (3) in contact above the first monitoring mechanism (2), and an external frame (4) on the outside of the top of the monitoring rod (3), characterized in that, The outer frame (4) is fixedly connected to the base (1) by a support rod (7). The outer frame (4) is provided with a spraying part placement mechanism (5). The bottom of the spraying part placement mechanism (5) is fixedly connected to the monitoring rod (3). The first monitoring mechanism (2) includes a mounting plate (21), a first pressure sensor (22) is mounted on the top of the mounting plate (21), and side limiting members (23) are provided on both sides of the first pressure sensor (22). The side limiting members (23) include a housing (231). A groove is provided on the side of the housing (231) near the monitoring rod (3). A connecting plate (232) is provided in the groove of the housing (231). There are two connecting plates (232) in the housing (231). The side of the connecting plates (232) that are far apart from each other is fixedly connected to the inner wall of the housing (231) by a first spring (233). The monitoring rod (3) includes a main rod body (31), a movable adjusting ball (32) is provided in the middle of the main rod body (31), the main rod body (31) is movably inserted into the movable adjusting ball (32), and a first hinge seat (33) is installed on both sides of the bottom of the main rod body (31). A first control plate (34) is rotatably connected to the first hinge seat (33), and the first control plate (34) is correspondingly inserted into the outer shell (231). The sprayed part placement mechanism (5) includes a fixing plate (51), a fixing groove (52) is provided on the top of the fixing plate (51), an annular plate (53) is fixed on the inner wall of the top of the fixing groove (52), a telescopic plate (54) is fixed on the inner wall of the annular plate (53), four telescopic plates (54) are provided, an electric push rod (55) is installed on the output end of each telescopic plate (54), and a fixed suction cup (56) is fixedly connected to the bottom of each electric push rod (55); the bottom of the fixing plate (51) is fixedly connected to the top of the main rod body (31); The telescopic plate (54) is divided into a main sleeve plate fixed to the inner wall of the annular plate (53) and a telescopic sleeve plate movably inserted in the main sleeve plate. The telescopic sleeve plate and the main sleeve plate move through the air rod installed in the main sleeve plate. The bottom of the fixed plate (51) is connected to the main rod (31) via a second monitoring mechanism (6). The second monitoring mechanism (6) includes a connecting diagonal rod (61) and a second hinge seat (62). The second hinge seat (62) is installed on the bottom of the fixed plate (51). The connecting diagonal rod (61) is rotatably connected to the second hinge seat (62). The end of the connecting diagonal rod (61) away from the second hinge seat (62) is fixedly connected to a limiting plate (63). The top of the limiting plate (63) is fixedly connected to a second spring (64).

2. The spray thickness monitoring device for spraying equipment according to claim 1, characterized in that: The main rod (31) above the movable adjusting ball (32) is provided with a side limiting groove (35), and a second pressure sensor (36) is installed at the bottom of the side limiting groove (35).

3. The spray thickness monitoring device for spraying equipment according to claim 1, characterized in that: The limiting plate (63) is slidably inserted into the side limiting groove (35). The bottom of the limiting plate (63) is directly above the second pressure sensor (36). The end of the second spring (64) away from the limiting plate (63) is fixed to the inner top of the side limiting groove (35).

4. The spray thickness monitoring device for spraying equipment according to claim 1, characterized in that: The outer frame (4) includes an annular cylindrical shell (41) and an annular groove (42) opened on the inner wall of the annular cylindrical shell (41). The outer wall of the annular cylindrical shell (41) is fixedly connected to the top of the base (1) by a support rod (7). The fixing plate (51) is movably inserted into the annular groove (42). The part of the fixing plate (51) set inside the annular groove (42) and the annular groove (42) are both provided with elastic soft pads.

5. The spray thickness monitoring device for spraying equipment according to claim 1, characterized in that: The middle part of the support rod (7) near the movable adjusting ball (32) is fixedly connected to the movable adjusting ball (32).

6. A method of using a spray thickness monitoring device for spraying equipment, as described in any one of claims 1 to 5, characterized in that: The specific usage method of the coating thickness monitoring device for this spraying equipment is as follows: S1. Installation of the sprayed parts: Place the five parts to be sprayed on the fixed groove (52). Then, turn on the air rod in the telescopic plate (54) to drive the telescopic plate (54) to extend and retract, thereby adjusting the position of the fixed suction cup (56) until the fixed suction cup (56) is located directly above the edge of the sprayed part. At this time, turn on the electric push rod (55) and use the electric push rod (55) to drive the fixed suction cup (56) to move down, thereby fixing the sprayed part on the fixed groove (52) by the suction force and pressure of the fixed suction cup (56), thus completing the fixing of the sprayed part. S2, Painting operation: After the painting parts are fixed, place the external painting equipment above the fixed groove (52), and then use the painting equipment to paint the painting parts on the fixed groove (52). S3. Thickness detection: During the painting process, the paint thickness can be monitored by the first monitoring mechanism (2) and the second monitoring mechanism (6), as follows: When the middle part of the part is painted, a downward impact force will be generated on the part during the painting process, which will cause the fixing groove (52) to move down a certain distance in the annular groove (42). At the same time, the bottom of the main rod (31) will slowly move down, generating pressure on the first pressure sensor (22) below it. The first pressure sensor (22) will detect the pressure value. When the pressure reaches a certain level, an alarm will be triggered. The thickness of the paint can be automatically controlled by adjusting the alarm pressure value according to the required paint thickness. When the edge of the part is painted, the main rod (31) is partially inserted into the movable adjusting ball (32), and the first control plate (34) at the bottom of the main rod (31) is movably connected to the first hinge seat (33). Therefore, when the edge of the part is subjected to force, the part and the fixing groove (52) will tilt. At this time, the connecting rod (61) connected to the bottom of the fixing groove (52) will generate a downward pressure, which will cause the limiting plate (63) at one end of the connecting rod (61) to slide in the side limiting groove (35) until it touches the second pressure sensor (36), thereby triggering an alarm. At this time, the pressure indicates that the paint thickness has reached a certain level.

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