Coating thickness gauge

Abstract

The utility model relates to the technical field of thickness gauges, in particular to a coating thickness gauge, which comprises a measuring scale, a sliding sleeve and a measuring needle, the sliding sleeve is movably sleeved on the outer side of the measuring scale, the measuring needle is mounted at one end of the bottom of the sliding sleeve, an adjusting cylinder is mounted at the bottom end of the measuring scale, and the adjusting cylinder is sleeved on the sliding sleeve. The measuring needle is slidably connected with the adjusting cylinder, the bottom end of the adjusting cylinder is rotatably connected with a positioning disc, the adjusting cylinder is provided with a movable trepanning mechanism, the movable trepanning mechanism comprises a replacement assembly, a trepanning needle, a protection assembly and an elastic pressing assembly, the replacement assembly is used for replacing the trepanning needle, and the protection assembly is used for protecting the trepanning needle. The protection assembly is used for sealing the adjusting cylinder, and the elastic pressing assembly is used for being matched with the trepanning needle to conduct trepanning operation. The device is simple in structure and convenient to operate, a worker can conveniently replace the trepanning needle which is seriously abraded in time, labor and time are saved during positioning and disassembling operation, the working efficiency is further improved, and the efficiency of subsequent trepanning detection is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to thickness gauge technical field, concretely relates to a paint thickness gauge. BACKGROUND

[0002] Now steel structure building is widely used, but the fireproof performance of steel structure is poor, therefore in order to improve the fire resistance of steel structure, usually spray fireproof paint on the surface of steel structure, and the thickness of fireproof paint also has certain requirement, therefore the fireproof paint on the surface of steel structure is measured, detects whether the thickness of fireproof paint meets the requirement, the test process in the prior art is that the abutting seat of test equipment is placed on the surface to be measured, the measuring needle is stretched out from the abutting seat by pushing the sliding sleeve, and is inserted into fireproof paint, until the surface is punctured and stops, at this time the thickness of fireproof paint is displayed on the display screen on the sliding sleeve, but the measuring needle is prone to wear after multiple measurements, and is not easy to replace, the conventional method to avoid probe wear is that the operator first uses a cone to pierce the fireproof layer, then pulls out, and then inserts the thickness gauge probe into the insertion hole to test the thickness of fireproof material, so it is necessary to prepare a penetrating needle and a test device respectively, and the operation is relatively cumbersome, and the penetrating needle is generally small in size, and is easy to lose during use, and in view of this, the utility model is provided.

[0003] In order to solve the above technical problems, the prior art disclosed in Chinese patent with publication number CN220568036U discloses a kind of fireproof paint thickness measuring equipment, including the lower end of measuring scale is connected with rotating tube; Rotating tube lower end outside is equipped with abutting seat; Measuring scale outside sliding sleeve is equipped with sliding sleeve; The lower end of sliding sleeve is connected with measuring needle; Measuring needle lower end is movably penetrated into rotating tube; Rotating tube is movably equipped with drill needle.

[0004] Although the prior art scheme can reduce the wear of the measuring needle and increase its service life, the drill needle can be made of a relatively hard and wear-resistant material compared to the measuring needle, but the drill needle will also wear out after a period of use regardless of its material, which may cause the drill needle to be difficult to pierce the paint layer or unable to completely pierce the paint layer. However, the drill needle is directly connected to the bottom end of the connecting block and is enclosed inside the rotating tube, making it difficult for workers to replace the drill needle in time to ensure the subsequent drilling measurement effect. UTILITY MODEL CONTENTS

[0005] The utility model discloses a purpose at providing a kind of paint thickness gauge, to solve the problem that the drilling needle on the thickness gauge compared with the measuring needle can be used more hard wear-resistant material as presented in the above background art, no matter what material drilling needle will also appear wear after a period of use, in turn cause difficult to pierce paint layer or unable to completely pierce paint layer condition, its drilling needle is directly connected in the bottom end of connecting block, also enclosed in the inside of rotating pipe, staff is difficult to replace drilling needle in time to ensure the drilling measurement effect of subsequent problem.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A kind of paint thickness gauge, including measuring scale, sliding sleeve and measuring needle, the sliding sleeve is movably sleeved in the outside of measuring scale, the measuring needle is installed in the one end of sliding sleeve bottom, the bottom end of measuring scale is equipped with adjusting cylinder, the measuring needle is slidably connected with adjusting cylinder, the bottom end of adjusting cylinder is rotatably connected with positioning disc, adjusting cylinder is installed with movable trepanning mechanism, the movable trepanning mechanism includes replacement assembly, trepanning needle, protection assembly and elastic pressing assembly, the replacement assembly is used to replace trepanning needle, the protection assembly is used to close adjusting cylinder, the elastic pressing assembly is used to cooperate trepanning needle and carry out trepanning operation.

[0008] As the preferred scheme of the utility model, the elastic pressing assembly includes operating lever slidably connected to one end inside adjusting cylinder, the outer wall of operating lever located inside adjusting cylinder is equipped with connecting plate, the first spring is installed between the both ends of one side of connecting plate and the inner wall of adjusting cylinder, the probe hole that is symmetrically opened along the center of the bottom end of the inner wall of adjusting cylinder is passed through positioning disc.

[0009] As the preferred scheme of the utility model, the replacement assembly includes the sliding slot opened in the both ends of other side top of connecting plate, the section of sliding slot is T-shaped, the inner side of sliding slot is slidably connected with sliding rod, one group of the other end of sliding rod is equipped with first clamping cover, the other group of the other end of sliding rod is equipped with second clamping cover, which is hingedly connected with first clamping cover, the inner side of first clamping cover and second clamping cover is embedded with rubber pad.

[0010] As the preferred scheme of the utility model, the top of sliding rod is equipped with docking seat, the inside of one group of docking seat is slidably connected with movable rod, the restraint groove is opened in the outer wall of movable rod inside docking seat, the restraint groove is slidably connected with restraint plate, the restraint plate is rotatably connected with movable rod, the second spring is installed between the one side of restraint plate and the inner wall of restraint groove, the operating slot is opened in the other side of restraint groove inside docking seat, and the one end of movable rod extending to the inner side of operating slot is equipped with torsion plate.

[0011] As the utility model discloses preferably, one group of the docking seat is provided with a recycling groove on the side close to the other group of docking seat, the other end of the movable rod is provided with an extension plate, the other group of the docking seat is provided with an extension groove on the side and is slidably connected with the extension plate, and the inside of the docking seat is provided with a locking groove on the side of the extension groove.

[0012] As the utility model discloses preferably, the inside of the docking seat is provided with a telescopic groove on the side of the locking groove, the telescopic groove is slidably connected with a telescopic plate, the inside of the docking seat is provided with a linkage groove on the side of the telescopic groove, the linkage groove is slidably connected with a linkage rod, the inside of the docking seat is provided with a smooth groove on the side of the linkage groove, and the inside of the smooth groove is communicated with the inside of the linkage groove.

[0013] As the utility model discloses preferably, the inside of the smooth groove is rotatably connected with a deflection rod on one side, the outside of the deflection rod is fixedly provided with a gear, a torsion spring is arranged between the deflection rod and the inner wall of the smooth groove, the other end of the inside of the smooth groove is slidably connected with a rack, the rack is meshingly connected with the gear, and one end of the deflection rod extending to the outside of the docking seat is provided with a push plate.

[0014] As the utility model discloses preferably, the other end of the linkage rod is fixedly connected with one end of the rack, and the opposite ends of the extension plate and the telescopic plate are all provided with inclined surfaces.

[0015] As the utility model discloses preferably, the protection assembly comprises a convex plate arranged on one side of the outer wall of the adjusting cylinder, a push groove is formed in the top end of the convex plate, a push plate is slidably connected to the inside of the push groove, the cross section of the push plate and the push groove is T-shaped, a sealing plate is arranged on the top end of the push plate, the sealing plate is hingedly connected to the adjusting cylinder, the push plate is made of iron, and a magnetic block is embedded in the inner wall of the push groove and is adsorbed to the push plate.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] In the utility model, the opening needle is replaced by the replacement assembly, the adjusting cylinder is closed by the protection assembly, the opening operation is carried out by the elastic pressing assembly in cooperation with the opening needle, the structure is simple, the operation is convenient, the staff can replace the seriously worn opening needle in time, the positioning and splitting operation is labor-saving and time-saving, the working efficiency is further improved, and the efficiency of subsequent opening detection is ensured.

[0018] The utility model discloses a push -and -pull plate is removed to the inside of push -and -pull groove and is slid along with the cooperation of the sealing plate that holds, makes the push -and -pull plate far from the magnetic block no longer adsorbs, and the inside structure of adjusting cylinder is exposed to the personnel and carries out operation, vice versa can remove the sealing plate cooperation push -and -pull plate and move after assembling, let push -and -pull plate and magnetic block adsorb, and the sealing plate can cover the adjusting cylinder again and carry out the protection to the internal structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is whole structure schematic diagram of the utility model;

[0020] Figure 2 It is sealing plate expanded three -dimensional structure schematic diagram of the utility model;

[0021] Figure 3 It is inside partial three -dimensional structure schematic diagram of adjusting cylinder of the utility model;

[0022] Figure 4 It is two groups of butt joint seat partial section view structure schematic diagram of the utility model.

[0023] In the drawing: 1, measuring scale;2, sliding sleeve;3, measuring needle;4, adjusting cylinder;5, positioning disc;6, trepanning needle;7, operating rod;8, connecting plate;9, sliding rod;10, first clamping cover;11, second clamping cover;12, butt joint seat;13, restraint plate;14, extension plate;15, telescopic plate;16, linkage rod;17, gear;18, torsional spring;19, fixed block;20, push -and -pull plate;21, sealing plate;22, magnetic block. DETAILED DESCRIPTION

[0024] The technical scheme in the embodiments of the utility model will be apparently, clearly and completely described in conjunction with the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments, based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model.

[0025] Embodiment: please refer to Figures 1-4 The utility model provides a technical scheme:

[0026] A kind of paint thickness gauge, including measuring scale 1, sliding sleeve 2 and measuring needle 3, sliding sleeve 2 is movably sleeved in the outside of measuring scale 1, measuring needle 3 is installed in the bottom of one end of sliding sleeve 2, the bottom end of measuring scale 1 is equipped with adjusting cylinder 4, measuring needle 3 is slidably connected with adjusting cylinder 4, the bottom end of adjusting cylinder 4 is rotatably connected with positioning disc 5, adjusting cylinder 4 is equipped with movable aperture mechanism, movable aperture mechanism includes replacement assembly, aperture needle 6, protection assembly and elastic pressing assembly, replacement assembly is used to replace aperture needle 6, protection assembly is used to close adjusting cylinder 4, elastic pressing assembly is used to cooperate aperture needle 6 and carry out aperture operation, the device can replace aperture needle 6 by replacement assembly when using, protection assembly closes adjusting cylinder 4, elastic pressing assembly cooperates aperture needle 6 and carries out aperture operation, it is simple in structure, easy to operate, it is convenient for staff to replace the aperture needle 6 of serious wear and tear in time, positioning and split operation save time and effort, further improve work efficiency, guarantee the efficiency of subsequent aperture detection.

[0027] In the present embodiment, as shown in Figure 1 、 Figure 2 and Figure 3 , the protection assembly includes the lug installed in the outer wall of adjusting cylinder 4, the top end of the lug is provided with a push slot, the push slot is slidably connected with a push plate 20 on the inner side, the push plate 20 and the cross section of the push slot are T-shaped, the top end of the push plate 20 is installed with a sealing plate 21, the sealing plate 21 is snap-fit connected with the adjusting cylinder 4, the push plate 20 is an iron block, the inner wall of the push slot is embedded with a magnetic block 22 that is adsorbed with the push plate 20. First, when assembling the aperture needle 6, the sealing plate 21 can be held to cooperate with the push plate 20 to slide along the inner side of the push slot, so that the push plate 20 is away from the magnetic block 22 and no longer adsorbed, and the inner structure of the adjusting cylinder 4 is exposed for operation. Conversely, after assembly is completed, the sealing plate 21 can be pushed again to cooperate with the push plate 20 to move, so that the push plate 20 and the magnetic block 22 are adsorbed, and the sealing plate 21 can cover the adjusting cylinder 4 again to protect the internal structure.

[0028] In the present embodiment, as shown in Figure 1 、 Figure 2 and Figure 3As shown, the replacement assembly comprises sliding grooves opened at both ends of the other side of the top of the connecting plate 8, the cross section of the sliding groove is T-shaped, the inner side of the sliding groove is slidingly connected with a sliding rod 9, one end of one group of sliding rods 9 is provided with a first clamping cover 10, the other end of the other group of sliding rods 9 is provided with a second clamping cover 11 which is hingedly connected with the first clamping cover 10, the inner side of the first clamping cover 10 and the second clamping cover 11 is embeddedly provided with a rubber pad, the top end of the sliding rod 9 is provided with a butt joint seat 12, the inside of one group of butt joint seats 12 is slidingly connected with a movable rod, the inside of the butt joint seat 12 located outside the movable rod is provided with a restraint groove, the inner side of the restraint groove is slidingly connected with a restraint plate 13, the restraint plate 13 is rotatably connected with the movable rod, the second spring is installed between one side of the restraint plate 13 and the inner wall of the restraint groove, the inside of the butt joint seat 12 located on the other side of the restraint groove is provided with an operation groove, one end of the movable rod extending to the inner side of the operation groove is provided with a torsion plate, one side of one group of butt joint seats 12 close to the other group of butt joint seats 12 is provided with a recovery groove, the other end of the movable rod is provided with an extension plate 14, one side of the other group of butt joint seats 12 is provided with an extension groove which is slidingly connected with the extension plate 14, the inside of the butt joint seat 12 located on one side of the extension groove is provided with a locking groove, then, after the sealing plate 21 is opened, the trepanning needle 6 can be placed between the first clamping cover 10 and the second clamping cover 11, then the other hand presses the two groups of butt joint seats 12 close, the sliding rod 9 can move in the inner side of the sliding groove to ensure the stability of the movement, until the two groups of rubber pads clamp the trepanning needle 6, then one hand holds the other group of butt joint seats 12 and the other hand holds the torsion plate and squeezes the movable rod, so that the restraint plate 13 squeezes the first spring and the extension plate 14 penetrates into the inner side of the locking groove through the extension groove.

[0029] In this embodiment, as Figure 2 , Figure 3 and Figure 4As shown, the docking seat 12 inside the locking groove is provided with an extension groove on one side, the extension groove is slidably connected with an extension plate 15, the docking seat 12 inside the extension groove is provided with a linkage groove on one side, the linkage groove is slidably connected with a linkage rod 16, the docking seat 12 inside the linkage groove is provided with a smooth groove on one side, the smooth groove is in communication with the inside of the linkage groove, the inside of the smooth groove is rotatably connected with a deflection rod on one side, the outside of the deflection rod is fixedly sleeved with a gear 17, a torsion spring 18 is installed between the deflection rod and the inner wall of the smooth groove, the other end of the inside of the smooth groove is slidably connected with a rack, the rack is meshingly connected with the gear 17, the end of the deflection rod extending to the outside of the docking seat 12 is installed with a push plate, further, as the extension plate 14 advances, the inclined surfaces on the extension plate 14 and the extension plate 15 abut, forcing the extension plate 15 to drive the linkage rod 16 and the rack to retract, the bottom end of the gear 17 rotates the deflection rod to make the torsion spring 18 on it retract, after the extension plate 14 and the extension plate 15 are completely away from each other, the extension plate 15 is ejected by the torsion spring 18, at this time the movable rod can be released, the first spring drives the restraint plate 13 and the movable rod to move back, so that the fixed block 19 on the extension plate 14 is clamped into the fixed groove, completing the clamping and locking of the hole needle 6.

[0030] In this embodiment, as shown in Figure 2 , Figure 3 and Figure 4 , the other end of the linkage rod 16 is fixedly connected with one end of the rack, the opposite ends of the extension plate 14 and the extension plate 15 are provided with inclined surfaces, one side of the extension plate 14 is installed with a fixed block 19, one side of the extension plate 15 is provided with a fixed groove which is clampedly connected with the fixed block 19, the elastic pressing assembly includes an operating rod 7 which is slidably connected to one end inside the adjusting cylinder 4, the outer wall of the operating rod 7 located inside the adjusting cylinder 4 is installed with a connecting plate 8, the first spring is installed between the two ends of one side of the connecting plate 8 and the inner wall of the adjusting cylinder 4, the bottom end of the inner wall of the adjusting cylinder 4 is symmetrically provided with a probe hole which penetrates the positioning disc 5, further, when the hole needle 6 needs to be replaced, the cover plate 21 can be opened again, the movable rod can be squeezed again to make the fixed block 19 away from the inside of the fixed groove, at this time the other hand can pinch the push plate to drive the deflection rod to actively deflect, so that the torsion spring 18 actively retracts, the gear 17 cooperates with the rack to drive the extension plate 15 on the linkage rod 16 to retract again, after the fixed groove and the fixed block 19 are separated from each other, the two groups of docking seats 12 can be pulled apart in opposite directions to separate the two groups of rubber pads, so that the hole needle 6 falls down to complete the disassembly, the operating rod 7 is pulled up to drive the hole needle 6 to move up, so that the connecting plate 8 squeezes the two groups of first springs to retract, then the hand is released, the two groups of first springs drive the hole needle 6 to penetrate the probe hole to pierce into the paint layer for hole making.

[0031] The implementation principle of the coating thickness gauge embodiment of the present application is as follows: when assembling the opening needle 6, the sealing plate 21 can be held first, and the push plate 20 is moved along the inner side of the push groove, so that the push plate 20 is away from the magnetic block 22 and no longer adsorbed, and the inner structure of the adjusting cylinder 4 is exposed for operation by personnel; conversely, after assembly is completed, the sealing plate 21 can be pushed again to move the push plate 20 together with the push plate 20 to be adsorbed, and the sealing plate 21 can cover the adjusting cylinder 4 again to protect the internal structure; after the sealing plate 21 is opened, the opening needle 6 can be placed between the first clamping cover 10 and the second clamping cover 11, then the other hand presses the two sets of butt joints 12 close, the sliding rod 9 can move in the inner side of the sliding groove to ensure the stability of movement, until the two sets of rubber pads clamp the opening needle 6, then one hand holds the two sets of butt joints 12 and the other hand holds the torsion plate to squeeze the movable rod, the restraint plate 13 squeezes the first spring and the extension plate 14 penetrates into the locking groove through the extension groove, as the push progresses, the inclined surface on the extension plate 14 and the extension plate 15 abuts, forcing the extension plate 15 to drive the linkage rod 16 and the rack to retract, the bottom end of the gear 17 deflects the rod to rotate, causing the torsion spring 18 thereon to retract, after the extension plate 14 and the extension plate 15 are completely away from each other, the extension plate 15 is ejected by the torsion spring 18, at this time the movable rod can be released, the first spring drives the restraint plate 13 and the movable rod to move back, so that the fixed block 19 on the extension plate 14 is clamped into the fixed groove, completing the clamping and locking of the opening needle 6, conversely, when the opening needle 6 needs to be replaced, the sealing plate 21 can be opened again, the fixed block 19 is away from the inner side of the fixed groove by squeezing the movable rod with the torsion plate again, at this time the other hand can hold the push plate to drive the deflection rod to actively deflect, causing the torsion spring 18 to actively retract, the gear 17 cooperates with the rack to drive the extension plate 15 on the linkage rod 16 to retract again, after the fixed groove and the fixed block 19 are separated from each other, the two sets of butt joints 12 can be pulled apart in the opposite direction to separate the two sets of rubber pads, so that the opening needle 6 falls down to complete the disassembly, the pulling operation rod 7 drives the opening needle 6 to move up, so that the connecting plate 8 squeezes the two sets of first springs to retract, then the hand is released, and the two sets of first springs drive the opening needle 6 to penetrate the probe hole to pierce into the coating layer to open a hole.

[0032] The control mode of the utility model is controlled by the controller, the control circuit of the controller can be realized by simple programming of the person skilled in the art, the power supply also belongs to the public knowledge in the art, and the utility model is used to protect the mechanical device, so the utility model will not explain the control mode and circuit connection in detail.

[0033] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A coating thickness gauge comprising a measuring scale (1), a sliding sleeve (2) and a measuring pin (3), characterized in that: The sliding sleeve (2) is movably sleeved outside the measuring scale (1), the measuring needle (3) is installed at one end of the bottom of the sliding sleeve (2), the bottom end of the measuring scale (1) is provided with an adjusting cylinder (4), the measuring needle (3) is in sliding connection with the adjusting cylinder (4), the bottom end of the adjusting cylinder (4) is rotatably connected with a positioning disc (5), the adjusting cylinder (4) is provided with a movable opening mechanism, the movable opening mechanism comprises a replacement assembly, an opening needle (6), a protection assembly and a elastic pressing assembly, the replacement assembly is used for replacing the opening needle (6), the protection assembly is used for closing the adjusting cylinder (4), and the elastic pressing assembly is used for cooperating with the opening needle (6) to perform the opening operation.

2. A coating thickness gauge according to claim 1, characterised in that: The elastic pressing assembly comprises an operating rod (7) slidably connected to one end inside the adjusting cylinder (4), the operating rod (7) is provided with a connecting plate (8) on the outer wall of one section inside the adjusting cylinder (4), first springs are arranged between the two ends of one side of the connecting plate (8) and the inner wall of the adjusting cylinder (4), and a probe hole penetrating through the positioning disc (5) is symmetrically formed at the center of the bottom end of the inner wall of the adjusting cylinder (4).

3. A coating thickness gauge according to claim 2, characterised in that: The replacement assembly comprises sliding grooves formed at the two ends of the other side of the top of the connecting plate (8), the cross section of the sliding groove is T-shaped, sliding rods (9) are slidably connected to the inner side of the sliding groove, one end of one group of the sliding rods (9) is provided with a first clamping cover (10), one end of the other group of the sliding rods (9) is provided with a second clamping cover (11) in clamping connection with the first clamping cover (10), and rubber pads are embeddedly arranged in the inner sides of the first clamping cover (10) and the second clamping cover (11).

4. A coating thickness gauge according to claim 3, characterised in that: The top end of the sliding rod (9) is provided with a butt joint seat (12), the inner side of one group of the butt joint seats (12) is slidably connected with a movable rod, a restraint groove is formed in the outer wall of the movable rod in the inner side of the butt joint seat (12), a restraint plate (13) is slidably connected to the inner side of the restraint groove, the restraint plate (13) is rotatably connected with the movable rod, a second spring is arranged between one side of the restraint plate (13) and the inner wall of the restraint groove, an operating groove is formed in the other side of the inner side of the butt joint seat (12), and a torsion plate is arranged at the end of the movable rod extending to the inner side of the operating groove.

5. A coating thickness gauge according to claim 4, characterised in that: One side of one group of the butt joint seats (12) is provided with a recovery groove close to the other group of the butt joint seats (12), the other end of the movable rod is provided with an extension plate (14), one side of the other group of the butt joint seats (12) is provided with an extension groove in sliding connection with the extension plate (14), and a locking groove is formed in one side of the inner side of the butt joint seat (12) in the extension groove.

6. A coating thickness gauge according to claim 5, characterised in that: One side of the inner side of the butt joint seat (12) in the locking groove is provided with an extension groove, a telescopic plate (15) is slidably connected to the inner side of the extension groove, a linkage groove is formed in one side of the inner side of the butt joint seat (12) in the extension groove, a linkage rod (16) is slidably connected to the inner side of the linkage groove, a smooth groove is formed in one side of the inner side of the butt joint seat (12) in the linkage groove, and the inner side of the smooth groove is in communication with the inner side of the linkage groove.

7. A coating thickness gauge according to claim 6, characterised in that: The inner wall of the smooth groove is rotationally connected with a deflection lever, a gear (17) is fixedly sleeved on the outer side of the deflection lever, a torsion spring (18) is installed between the deflection lever and the inner wall of the smooth groove, a rack is slidably connected to the other end of the inner side of the smooth groove, the rack is in meshing connection with the gear (17), and a push plate is installed on the end of the deflection lever extending to the outside of the butt joint seat (12).

8. A coating thickness gauge according to claim 7, characterised in that: The other end of the linkage lever (16) is fixedly connected with one end of the rack, the opposite ends of the extension plate (14) and the telescopic plate (15) are both provided with inclined surfaces, a fixed block (19) is installed on one side of the extension plate (14), and the telescopic plate (15) is provided with a fixed groove in one side, which is in clamping connection with the fixed block (19).

9. A coating thickness gauge according to claim 8, characterised in that: The protection assembly comprises a convex plate installed on one side of the outer wall of the adjusting cylinder (4), a push moving groove is formed in the top end of the convex plate, a push moving plate (20) is slidably connected to the inner side of the push moving groove, the cross section of the push moving plate (20) and the push moving groove is T-shaped, a sealing plate (21) is installed on the top end of the push moving plate (20), the sealing plate (21) is in clamping connection with the adjusting cylinder (4), the push moving plate (20) is an iron block, and a magnetic block (22) is embeddedly installed on the inner wall of the push moving groove and is adsorbed to the push moving plate (20).

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