Coating thickness gauge

Abstract

The utility model relates to a coating thickness gauge. The coating thickness gauge comprises a shell, a circuit board is arranged in the shell, the circuit board is connected with a probe, the probe is integrally and fixedly arranged at the front end of the circuit board, the probe is provided with a pressing end forwards extending out of the shell, an elastic trigger switch is fixedly arranged at the rear end of the circuit board, and the probe, the circuit board and the elastic trigger switch can integrally move. A mounting structure for the circuit board to translate along the front-back direction is arranged in the shell, and a baffle plate is arranged at the rear end of the elastic trigger switch in the shell and is pressed by the trigger part of the elastic trigger switch. The coating thickness gauge is simple in overall structure, convenient to produce and assemble, high in production efficiency and capable of avoiding the problems that in the prior art, the probe is not limited, and the measurement result is inaccurate due to the fact that the probe or the circuit board is prone to jumping or bumping, and consequently the probe displacement of a connecting point between the probe and the circuit board is not constant.

Description

Technical Field

[0001] The utility model relates to the technical field of coating measurement, in particular to a coating thickness gauge. Background Art

[0002] The coating thickness gauge can non-destructively measure the thickness of non-magnetic coatings (such as aluminum, chromium, copper, enamel, rubber, paint, etc.) on magnetic metal substrates (such as steel, iron, alloys and hard magnetic steel, etc.), and can also non-destructively measure the thickness of non-conductive coatings (such as enamel, rubber, paint, plastic, etc.) on non-magnetic metal substrates (such as copper, aluminum, zinc, tin, etc.). It has the characteristics of small measurement error, high reliability, good stability, and easy operation. It is an indispensable testing instrument for controlling and ensuring product quality, and is widely used in manufacturing, metal processing, chemical industry, commodity inspection and other testing fields.

[0003] Existing coating thickness gauges generally include a housing, a circuit board is arranged inside the housing, and a probe connected to the circuit board is arranged on the housing. The trigger part of the probe mostly adopts a spring device plus a trigger switch, which leads to a complex structure and a large size. In addition, since the probe is not limited, the displacement of the probe during the movement process after contacting the object to be measured is not constant, resulting in inaccurate measurement results. For example, the measurement results of multiple times are different and the results are not unique. The probe is also prone to excessive compression, resulting in a greater chance of damage to the probe and the circuit board behind it. In addition, due to the unstable installation of the probe and the circuit board, the probe or the circuit board will shake or bump during the measurement process, which will also cause the displacement of the probe to be unstable, resulting in inaccurate measurement results. In addition, the analog signal is transmitted between the probe and the circuit board using a cable. When shaking or bumping, the connection point between the cable of the probe and the circuit board is prone to poor contact or even disconnection, resulting in signal distortion or unusable problems. Utility Model Content

[0004] The utility model aims to provide a coating thickness gauge to solve the problems of complex structure, unstable probe displacement during measurement and inaccurate measurement results in the prior art.

[0005] To achieve the above-mentioned purpose, a coating thickness gauge of the utility model adopts the following technical scheme: a coating thickness gauge, comprising a shell, a circuit board is arranged in the shell, the circuit board is connected to a probe, the probe is fixedly arranged at the front end of the circuit board as a whole, and the probe has a pressing end extending forward from the shell, an elastic trigger switch is fixedly arranged at the rear end of the circuit board, and the probe, the circuit board and the elastic trigger switch can move as a whole; an installation structure for the circuit board to be able to move in a forward and backward direction is arranged inside the shell, and a baffle is arranged at the rear end of the elastic trigger switch inside the shell for the trigger part of the elastic trigger switch to press; the probe has a measuring position in which it is pressed back into the shell by the object to be measured so that the shell and the object to be measured are in contact with each other to limit the position, and the probe also has a recovery position extending out of the shell under the action of the elastic trigger switch.

[0006] The mounting structure comprises a mounting plate arranged at the front end of the shell, a mounting hole which matches the outer side surface of the probe is arranged on the mounting plate, and the probe is movably installed in the mounting hole.

[0007] The installation structure comprises a left installation column and a right installation column which are arranged at intervals along the left and right sides. The left and right installation columns are both provided with guide grooves for supporting the circuit board and providing horizontal guide installation for the rear end of the circuit board.

[0008] The mounting structure comprises a left limiting post and a right limiting post which are arranged at intervals along the left and right sides, and the left limiting post and the right limiting post are respectively matched with the left side and the right side of the front part of the circuit board for limiting.

[0009] The sum of the gravity of the probe, the circuit board and the elastic trigger switch is smaller than the trigger force of the elastic trigger switch, so that when the probe is facing upward, the elastic trigger switch is not triggered due to gravity.

[0010] A main control board is arranged inside the shell, and the circuit board and the main control board are connected by a flexible flat cable to transmit digital signals.

[0011] The beneficial effects of the utility model are as follows: the probe is integrated on the circuit board, and the elastic trigger switch and baffle are fixedly arranged at the rear end of the circuit board. After the pressing end of the probe contacts the object to be measured and is subjected to pressure, the probe can move backward with the circuit board as a whole and retract into the shell. At this time, the front end of the shell contacts the object to be measured to limit the displacement, which ensures that the movement displacement of the probe is constant each time it is measured, ensures the stability of each measurement result, and also ensures that the probe will not be over-compressed, reduces the probability of damage to the probe and the circuit board, and increases the service life. The coating thickness gauge of the present application has a relatively simple overall structure, is easy to produce and assemble, and has high production efficiency. Moreover, the setting of the mounting structure limits the circuit board and the probe thereon to only be able to move forward and backward, and the circuit board will not jump or bump in the up and down directions. The integrated setting of the probe and the circuit board can move horizontally as a whole, and can also ensure that the displacement of the probe is constant. At the same time, it also avoids the problem of inaccurate measurement caused by the probe or the circuit board being prone to jumping or bumping at the connection point between the probe and the circuit in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an embodiment of a coating thickness gauge of the utility model;

[0013] Figure 2 yes Figure 1 A schematic diagram of the structure at another angle;

[0014] Figure 3 yes Figure 2 Schematic diagram of the internal structure;

[0015] Figure 4 yes Figure 3 A partial enlarged view of the middle A;

[0016] Figure 5 yes Figure 3 A partial enlarged view of point B in the middle. DETAILED DESCRIPTION

[0017] In order to facilitate the understanding of the present invention, the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments. The accompanying drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0018] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meanings as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0019] An embodiment of a coating thickness gauge of the utility model is as follows Figure 1-Figure 5 As shown, it includes a housing 1, a circuit board 8 and a main control board 9 are arranged in the housing, and the circuit board is connected to the main control board through a flexible cable to transmit digital signals. The circuit board is connected to a probe 4, and the housing is provided with a data transmission port 6 and a display screen 2 connected to the main control board. The main control board is provided with a switch contact, and the housing is provided with a switch button 3 corresponding to the switch contact. The housing is provided with a battery compartment and a battery compartment cover 5. In this embodiment, the battery is used to power the main control board and the circuit board, and the battery adopts a dry cell or a rechargeable lithium battery.

[0020] The probe 4 is fixedly arranged at the front end of the circuit board 8 as a whole, and the probe has a pressing end extending forward from the shell. The rear end of the circuit board is fixedly provided with an elastic trigger switch 12. The probe 4, the circuit board 8 and the elastic trigger switch 12 form a whole and can move as a whole. The probe extends a certain distance from the front end of the shell. The probe is limited by the mounting plate in the natural state, and is limited by the front end of the shell when the probe is pressed, which ensures the normal operation of the elastic trigger switch and protects the elastic trigger switch from being over-compressed. Moreover, the probe can move backward as a whole with the circuit board and retract into the shell. At this time, the front end of the shell contacts and limits the object to be measured, which ensures that the movement displacement of the probe is constant each time it is measured, and ensures the stability of each measurement result. In the present application, when the elastic trigger switch is triggered, the circuit board starts the test with a delay to ensure the stability of the test data. For example, in this application, the maximum stroke of the probe is 0.7mm, and the trigger distance of the elastic trigger switch is 0.3mm. During normal testing, when the probe of the coating thickness gauge touches the surface of the object to be measured, the speed of human hand movement is 0.05-0.10m / s, and the minimum value is 0.05m / s. The elastic trigger switch is triggered when the stroke is 0.3mm, and the total stroke is 0.7mm. Then the maximum time required from triggering to probe stabilization is (0.7-0.3) / 50=0.08s=80ms. Therefore, after receiving the signal from the elastic trigger switch, the circuit board delays 80ms to start the test. At this time, the probe is in a stable state, ensuring the reliability of the test data.

[0021] The shell is provided with a mounting structure for the circuit board to move in the front-to-back direction, and a baffle 13 is provided at the rear end of the elastic trigger switch 12 inside the shell for the trigger part of the elastic trigger switch to press against. Specifically, the mounting structure includes a mounting plate 7 provided at the front end of the shell, and a mounting hole 15 is provided on the mounting plate to match the outer side of the probe. The probe 4 is movably installed in the mounting hole, and the front end of the circuit board can cooperate with the upper limit stopper of the mounting plate in the front-to-back direction. The probe has a measuring position in which it is pressed back into the shell by the object to be measured so that the shell and the object to be measured are in contact with each other. The probe also has a recovery position extending out of the shell under the action of the elastic trigger switch. The shell is a split structure, and a mounting groove 14 is provided on the shell for the mounting plate to match and place, and the mounting plate is fixed by the shell.

[0022] In addition, the mounting structure also includes a left mounting column 11 and a right mounting column 10 arranged along the left and right intervals, and the left and right mounting columns are both provided with a guide groove 18 for supporting the circuit board and providing the rear end of the circuit board with horizontal guide installation. Specifically, the left and right sides of the rear end of the circuit board are respectively correspondingly guided and installed in the guide grooves on the left and right mounting columns. The guide groove cooperates with the mounting holes on the mounting plate to ensure that the probe, the circuit board and the elastic trigger switch are translated in the front-to-back direction as a whole, and avoid bumping or position displacement in the up-down direction. The mounting structure also includes a left limit column 17 and a right limit column 16 arranged along the left and right intervals, and the left limit column and the right limit column are respectively limited with the left and right sides of the front part of the circuit board, which can further ensure that the probe, the circuit board and the elastic trigger switch are translated in the front-to-back direction as a whole. In order to prevent the elastic trigger switch from being triggered due to gravity when the thickness gauge is tested with the probe facing upward, in this embodiment, the sum of the gravity of the probe, the circuit board and the elastic trigger switch is less than the trigger force of the elastic trigger switch, so that it can be ensured that the elastic trigger switch is not triggered due to gravity when the probe is facing upward.

[0023] When in use, the probe contacts the object to be measured and the probe is subjected to force. The probe, the circuit board and the elastic trigger switch move backward as a whole. During the movement, the probe will gradually retract into the shell. The shell and the object to be measured are in contact and limit position, which can not only ensure the constant displacement of the probe each time, but also ensure that the probe will not be over-compressed. The triggering part of the elastic trigger switch contacts and squeezes the baffle, so that the elastic trigger switch is triggered. After receiving the signal from the elastic trigger switch, the circuit board can delay for a certain period of time until the probe position is stable before controlling the probe to measure. After the measurement is completed, release the thickness gauge, and under the elastic force of the elastic trigger switch, the probe and the circuit board are reset and wait for the next measurement.

[0024] In the above description of this specification, unless otherwise clearly specified and limited, the terms "fixed", "installed", "connected" or "connected" should be understood in a broad sense. For example, with regard to the term "connection", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal connection of two elements or the interaction relationship between two elements. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in this utility model according to the specific circumstances.

[0025] According to the above description of this specification, those skilled in the art may also understand that the terms used below, such as “upper”, “lower”, “front”, “back”, “left”, “right”, “length”, “width”, “thickness”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “axial”, “radial”, “circumferential”, “center”, “longitudinal”, “lateral”, “clockwise” or “counterclockwise”, etc., which indicate the orientation or position relationship, are based on the orientation or position relationship shown in the drawings of this specification, and are only for the purpose of facilitating the explanation of the scheme of the utility model and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in a specific orientation. Therefore, the above-mentioned orientation or position relationship terms cannot be understood or interpreted as limiting the scheme of the utility model. Specifically, in this embodiment, the front refers to the direction of the probe as the front, with the front direction as the center. Figure 3 For example, the probe is located in the front direction, and the thickness direction of the circuit board is the up-down direction.

[0026] In addition, the terms "first" or "second" used in this specification to refer to numbers or ordinals are only used for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, the meaning of "plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

Claims

1. A coating thickness gauge, comprising a housing, a circuit board disposed in the housing, the circuit board being connected to a probe, characterized in that: The probe is integrally fixedly arranged at the front end of the circuit board, and the probe has a pressing end extending forward from the shell, and an elastic trigger switch is fixedly arranged at the rear end of the circuit board, and the probe, the circuit board and the elastic trigger switch can move as a whole; a mounting structure for the circuit board to be able to move horizontally in the front and rear directions is arranged inside the shell, and a baffle is arranged at the rear end of the elastic trigger switch inside the shell for the trigger part of the elastic trigger switch to press; the probe has a measuring position in which it is pressed back into the shell by the object to be measured so that the shell and the object to be measured are in contact with each other to limit the position, and the probe also has a recovery position extending out of the shell under the action of the elastic trigger switch.

2. The coating thickness gauge according to claim 1, characterized in that: The mounting structure comprises a mounting plate arranged at the front end of the shell, a mounting hole which matches the outer side surface of the probe is arranged on the mounting plate, and the probe is movably installed in the mounting hole.

3. The coating thickness gauge according to claim 2, characterized in that: The installation structure comprises a left installation column and a right installation column which are arranged at intervals along the left and right sides. The left and right installation columns are both provided with guide grooves for supporting the circuit board and providing horizontal guide installation for the rear end of the circuit board.

4. The coating thickness gauge according to claim 1, characterized in that: The mounting structure comprises a left limiting post and a right limiting post which are arranged at intervals along the left and right sides, and the left limiting post and the right limiting post are respectively matched with the left side and the right side of the front part of the circuit board for limiting.

5. The coating thickness gauge according to any one of claims 1 to 4, characterized in that: The sum of the gravity of the probe, the circuit board and the elastic trigger switch is smaller than the trigger force of the elastic trigger switch, so that when the probe is facing upward, the elastic trigger switch is not triggered due to gravity.

6. The coating thickness gauge according to claim 5, characterized in that: A main control board is arranged inside the shell, and the circuit board and the main control board are connected by a flexible flat cable to transmit digital signals.

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