A corrosion coating thickness gauge protection structure

Abstract

This application discloses a protective structure for a corrosion coating thickness gauge, relating to the field of thickness gauges. It includes a main unit and a probe, with the main unit electrically connected to the probe. A negative pressure clamp is provided around the probe, and a wear-resistant gasket is connected to the probe end face via the negative pressure clamp. The negative pressure clamp includes two semi-ring hoops, with a sealing element on one side surface of each semi-ring. Two or more circumferentially distributed vent holes are provided on the semi-ring hoops, and each vent hole contains an axially movable piston assembly. A linkage ring connects the moving ends of all piston assemblies, and an elastic sleeve is tensioned between the outer wall of the probe and the inner ring of the linkage ring. The negative pressure clamp, composed of the two semi-ring hoops, forms a seal with the outer ring of the wear-resistant gasket through the sealing element. When the operator presses down on the linkage ring, it synchronously drives all piston assemblies to move within the vent holes, changing the pressure. The elastic sleeve provides a stable reset force, ensuring the linkage ring and piston assemblies reset, thereby firmly adsorbing the wear-resistant gasket onto the probe end face through negative pressure.

Description

Technical Field

[0001] This application relates to the field of thickness gauges, and in particular to a protective structure for a corrosion coating thickness gauge. Background Technology

[0002] Currently, corrosion coating thickness gauges based on magnetic or eddy current principles are widely used to detect the thickness of anti-corrosion coatings on the surfaces of various steel structural components, metal plates, and other planar workpieces. These instruments, through the coordinated operation of the host and probe, can achieve rapid and non-destructive thickness measurement, providing crucial data support for assessing the corrosion status of the substrate and the protective effect of the coating.

[0003] However, during on-site testing, in order to locate measurement points or perform continuous measurements, operators habitually press the probe end face against the workpiece surface and drag it slightly. When there are rough protrusions such as welding slag, rust, or sand on the workpiece surface, this sliding will directly scratch the precision probe end face. This not only introduces significant measurement errors and leads to inaccurate readings, but also greatly increases the maintenance cost of the equipment due to the frequent replacement of the probe, constituting a prominent technical pain point in current on-site testing. Utility Model Content

[0004] To address the issue of probe dragging causing damage, this application provides a protective structure for a corrosion coating thickness gauge.

[0005] The protective structure for a corrosion coating thickness gauge provided in this application adopts the following technical solution:

[0006] A protective structure for a corrosion coating thickness gauge includes a main unit and a probe. The main unit is electrically connected to the probe. A negative pressure clamp is provided around the probe. A wear-resistant pad is detachably attached to the probe end face through the negative pressure clamp. The upper surface of the wear-resistant pad is in contact with the probe end face.

[0007] The negative pressure clamp includes two semi-circular hoops that are sleeved and fixed around the probe, and the two semi-circular hoops have a sealing element on the side surface facing the wear-resistant gasket.

[0008] The semi-ring hoop is provided with two or more circumferentially distributed air extraction holes, and each air extraction hole is provided with an axially movable piston assembly. All the piston assemblies are connected by a linkage ring, and the outer wall of the probe is stretched and connected to the inner ring of the linkage ring by an elastic sleeve.

[0009] By adopting the above technical solution, when the negative pressure clamp composed of two semi-ring hoops forms a seal with the outer ring of the wear-resistant gasket through the sealing element, the operator can press down the linkage ring to synchronously drive all piston assemblies to move within the air extraction hole, reducing the negative pressure in the air extraction hole, thereby releasing the wear-resistant gasket. The elastic sleeve provides a reset force to reset the piston assembly, restore the negative pressure, and adsorb the wear-resistant gasket. The elastic sleeve provides a stable reset force to ensure the reset of the linkage ring and piston assembly. Thus, the wear-resistant gasket is firmly adsorbed onto the probe end face through negative pressure, making the wear-resistant gasket a sacrificial layer to protect the probe. When the wear-resistant gasket wears due to dragging on the rough surface, the operator only needs to press down the linkage ring to release the negative pressure for quick replacement. This greatly extends the probe's service life and reduces maintenance costs while ensuring measurement accuracy.

[0010] Preferably, the piston assembly includes a piston rod, one end of which is fixedly connected to a plunger, and the outer wall of the plunger and the inner wall of the suction port are in a sealed sliding connection.

[0011] By adopting the above technical solution, the piston rod drives the plunger to slide in a sealed manner within the air extraction hole, thereby effectively generating negative pressure or restoring positive pressure within the air extraction hole.

[0012] Preferably, the semi-circular hoop has several guide holes around the air extraction hole. The axial ends of the guide holes are respectively provided with a first clamping plate and a second clamping plate. Several screws passing through the guide holes are fixedly connected to the first clamping plate. One end of the screw passes through the second clamping plate and is threadedly connected to a nut.

[0013] By adopting the above technical solution, the screw and nut passing through the guide hole are used to fasten the first clamping plate and the second clamping plate to the axial sides of the guide hole in the semi-ring hoop, preventing the piston assembly from detaching during operation.

[0014] Preferably, the top outer ring of the elastic sleeve is provided with a first fixing ring, and the lower inner ring of the elastic sleeve is provided with a second fixing ring.

[0015] By adopting the above technical solution, the elastic sleeve is reliably connected to the outer wall of the probe and the inner ring of the linkage ring through the first fixing ring at the upper end and the second fixing ring at the lower end, respectively, so as to ensure the effective reset function of the elastic sleeve.

[0016] Preferably, the sealing element has a plurality of circular holes for connecting the air extraction port, and a circular groove is provided on the lower end face of the sealing element.

[0017] By adopting the above technical solution, the round hole on the seal is used to ensure unobstructed air passage, while the round groove on the lower end face of the seal is used to accommodate and limit the wear-resistant gasket, preventing the wear-resistant gasket from radially slipping after adsorption and fixation.

[0018] Preferably, a convex ring is fixedly connected to the periphery of the probe, and the inner ring of the semi-circular hoop is provided with a positioning groove for limiting the connection of the convex ring to the axis.

[0019] By adopting the above technical solution, the convex ring on the probe cooperates with the positioning groove of the inner ring of the semi-circular hoop, realizing the axial positioning and installation of the negative pressure clamp on the periphery of the probe.

[0020] Preferably, the outer periphery of the semi-circular hoop is provided with a plurality of outwardly curved petal-shaped protective plates.

[0021] By adopting the above technical solution, the petal-shaped protective plate circumferentially set around the semi-ring hoop can make contact and undergo elastic deformation first when the probe approaches the workpiece, thereby avoiding direct collision or scratching between the probe or wear-resistant pad and the workpiece surface.

[0022] Preferably, sealing gaskets are clamped and connected between both ends of the semi-circular hoop and the first and second clamping plates.

[0023] By adopting the above technical solution, sealing gaskets are set between the joint surfaces of the two ends of the semi-circular hoop and the first and second clamping plates, which effectively enhances the airtightness of the two ends of the air extraction hole and prevents air leakage.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. This application uses a wear-resistant pad fixed by a negative pressure clamp as a sacrificial layer to directly contact the workpiece, effectively avoiding direct wear on the probe end face; combined with a unique negative pressure adsorption and manually unlocked negative pressure clamp, it enables quick replacement of the wear-resistant pad, fundamentally solving the problem of scratches caused by probe dragging, and significantly reducing the cost of use and maintenance.

[0026] 2. This application provides physical protection for the probe by setting outwardly curved petal-shaped protective plates around the periphery of the semi-ring hoop. The petal-shaped protective plates can contact the workpiece before the wear-resistant pad during measurement, and absorb the impact energy through their own elastic deformation, effectively preventing damage to the probe housing and its internal precision components in complex environments, and further improving durability. Attached Figure Description

[0027] Figure 1 This is an overall schematic diagram of the present application;

[0028] Figure 2 This is a schematic diagram of the negative pressure clamp of this application;

[0029] Figure 3 This is a schematic diagram of the negative pressure clamp part of this application;

[0030] Figure 4 This is an exploded view of the negative pressure clamp portion of this application;

[0031] Figure 5 This is a schematic diagram of the seal in this application.

[0032] Reference numerals: 1. Main unit; 2. Probe; 21. Convex ring; 3. Negative pressure clamp; 31. Semi-ring clamp; 311. Groove; 312. Positioning groove; 313. Air extraction hole; 314. Guide hole; 32. Petal-shaped protective plate;

[0033] 33. Piston rod; 331. Plunger; 34. Linkage ring; 35. Elastic sleeve; 351. First retaining ring; 352. Second retaining ring; 36. Seal; 361. Circular hole; 362. Circular groove;

[0034] 37. First clamping plate; 371. Through hole; 372. Screw; 373. Sealing gasket; 38. Second clamping plate; 381. Through hole; 39. Nut; 4. Wear-resistant gasket. Detailed Implementation

[0035] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0036] This application discloses a protective structure for a corrosion coating thickness gauge.

[0037] Reference Figure 1 , Figure 2 , Figure 4 A protective structure for a corrosion coating thickness gauge includes a main unit 1 and a probe 2 electrically connected to the main unit 1 via a wire. A circular wear-resistant pad 4 is attached to the end face of the probe 2. The wear-resistant pad 4 is made of polyetheretherketone and 30% glass fiber reinforced material. A negative pressure clamp 3 for removing and installing the wear-resistant pad 4 is provided around the probe 2. The negative pressure clamp 3 includes two semi-circular clamps 31, which are fixed to the periphery of the probe 2 by multiple screws. A convex ring 21 is integrally fixed to the periphery of the probe 2. The inner ring of the semi-ring 31 is provided with a positioning groove 312 that matches the outer wall of the convex ring 21. The convex ring 21 is used to limit the connection of the convex ring 21 with the positioning groove 312. The outer wall of the semi-ring 31 is provided with a groove 311 that is easy for the operator to grip. The two semi-rings 31 assembled into a cylindrical shape are provided with four or more outwardly curved petal-shaped protective plates 32 around their periphery. Both semi-rings 31 are provided with two or more circumferentially distributed air extraction holes 313. The axis of the semi-ring 31 is parallel to that of the air extraction hole 313.

[0038] The circular wear-resistant pad 4, which is attached to the end face of the probe 2 connected to the main unit 1, serves as a sacrificial layer that directly contacts the workpiece, protecting the expensive end face of the probe 2 from wear. The probe 2 is quickly fixed on the probe 2 by the positioning groove 312 of the inner ring of the two semi-ring hoops 31 through the outer convex ring 21. The operator can easily hold and apply force through the groove 311 on the outer wall of the semi-ring hoops 31. The petal-shaped protective plate 32 set around the periphery of the assembled semi-ring hoops 31 can contact the workpiece before the wear-resistant pad 4 and the probe 2 during measurement, playing a role in buffering and anti-collision. The air extraction holes 313 distributed around the semi-ring hoops 31 provide a structural basis for generating negative pressure to fix the wear-resistant pad 4.

[0039] Reference Figure 3 , Figure 4 , Figure 5 Two semi-circular rings 31 have circular sealing elements 36 on the side facing the wear-resistant gasket 4. The sealing elements 36 are used to increase the airtightness between the semi-circular rings 31 and the wear-resistant gasket 4. The diameter of the wear-resistant gasket 4 is larger than the diameter of the end face of the probe 2, and smaller than the diameter of the sealing element 36. The sealing element 36 has several circular holes 361 that are respectively connected to the air extraction hole 313. The circular holes 361 are used to connect the air extraction hole 313 with the outside air. The lower end face of the sealing element 36 is provided with a circular shape that is adapted to the shape of the wear-resistant gasket 4. The depth of the groove 362 is less than the thickness of the wear-resistant pad 4. Each air extraction hole 313 in the semi-ring 31 is provided with an axially movable piston assembly. The piston assembly is used for air extraction. The piston assembly includes an axially movable piston rod 33. A linkage ring 34 is fixedly connected between the moving ends of the piston rods 33 in all piston assemblies. One end of the piston rod 33 is fixedly connected to a plunger 331 provided in the air extraction hole 313. The outer wall of the plunger 331 is slidably and sealingly connected to the inner wall of the air extraction hole 313.

[0040] The circular seal 36 located on the lower side of the two semi-circular hoops 31 is used to form a reliable seal between the seal and the wear-resistant gasket 4 during negative pressure adsorption. The diameter of the wear-resistant gasket 4 is designed to be larger than the end face of the probe 2 for complete coverage and protection, while being smaller than the diameter of the seal 36 to ensure that the outer ring of the wear-resistant gasket 4 can be completely covered by the sealing area. The circular hole 361 on the seal 36 forms an airflow channel between the air extraction hole 313 and the outer space of the wear-resistant gasket 4. The circular groove 362 on the lower end face of the seal 36 is used to limit the wear-resistant gasket 4. The depth of the circular groove 362 is less than the thickness of the wear-resistant gasket 4 to ensure that the wear-resistant gasket 4 can be lifted by negative pressure adsorption and fit tightly against the end face of the probe 2. By driving the piston rod 33, the plunger 331 is driven to slide in a sealed manner in the air extraction hole 313, which can change the volume of the sealed space, thereby generating the negative pressure required to adsorb and fix the wear-resistant gasket 4. All piston rods 33 achieve synchronous movement through the linkage ring 34 to ensure the uniformity of the adsorption force.

[0041] Reference Figure 3 , Figure 4 An elastic sleeve 35 is coaxially tensioned between the outer wall of the probe 2 top and the inner ring of the linkage ring 34. The outer ring of the top of the elastic sleeve 35 is provided with a first fixing ring 351 for fixing the top of the elastic sleeve 35 to the outer wall of the probe 2. The inner ring of the lower end of the elastic sleeve 35 is provided with a second fixing ring 352 for fixing the lower end of the elastic sleeve 35 to the inner wall of the linkage ring 34. Each air extraction hole 313 in the two semi-ring hoops 31 is provided with four guide holes 314 around its periphery. The guide holes 314 are parallel to the air extraction hole 313. The axial ends of the guide holes 314 are... The first clamping plate 37 and the second clamping plate 38 are clamped and connected respectively. Both ends of the semi-circular hoop 31 are clamped and connected with sealing gaskets 373 for sealing connection between the first clamping plate 37 and the second clamping plate 38. The first clamping plate 37 is provided with a through hole 371 for connecting the air extraction hole 313 and the round hole 361. The second clamping plate 38 is provided with a through hole 381 for passing through the piston rod 33. Four screws 372 are fixedly connected to the first clamping plate 37. One end of the screw 372 passes upward through the guide hole 314 and is threadedly connected to the second clamping plate 38 with a nut 39.

[0042] The elastic sleeve 35, connected between the top of the probe 2 and the linkage ring 34, is reliably fixed by the first fixing ring 351 at the top and the second fixing ring 352 at the bottom, providing a continuous elastic restoring force for the entire linkage ring 34 and piston assembly. This ensures that the plunger 331 is stably in the reset position when not in operation. The first clamping plate 37 and the second clamping plate 38, located at both axial ends of each suction port 313, are fastened to the nut 39 by a screw 372 passing through the guide hole 314. The plunger 331 is limited inside the air extraction hole 313 on both the upper and lower sides to prevent the plunger 331 from coming out of the air extraction hole 313. The sealing gasket 373 clamped between the two ends of the semi-ring 31 and the first clamping plate 37 and the second clamping plate 38 is used to improve the air tightness of the two ends of the air extraction hole 313. The through hole 371 on the first clamping plate 37 ensures that the air passage between the air extraction hole 313 and the round hole 361 on the sealing element 36 is unobstructed. The through hole 381 on the second clamping plate 38 plays a precise guiding role in the movement of the piston rod 33.

[0043] It should be further noted that the semi-circular clamp 31, linkage ring 34, first clamping plate 37, and second clamping plate 38 of the negative pressure clamp 3 are all made of polycarbonate, the elastic sleeve 35 is made of liquid silicone with a Shore A50 hardness to ensure stable restoring force and long service life, the sealing element 36 is made of fluororubber with a Shore A60 hardness to achieve reliable sealing between the semi-circular clamp 31 and the lower wear-resistant gasket 4, and the petal-shaped protective plate 32 circumferentially arranged around the semi-circular clamp 31 is made of polyurethane elastomer with a Shore A60-80 hardness to ensure that it can undergo smooth and controllable bending deformation when compressed and can quickly rebound to its original shape after the external force is removed, thereby achieving effective buffering and repeated reliable protection.

[0044] The implementation principle of the protective structure for a corrosion coating thickness gauge in this application embodiment is as follows: Under normal conditions in environments such as petrochemical plants and offshore platforms, the pre-tightening force of the elastic sleeve 35 stably pulls the linkage ring 34 and piston assembly to the highest position. At this time, the negative pressure formed by the plunger 331 in the air extraction hole 313 reaches its maximum, using atmospheric pressure to tightly press the wear-resistant pad 4 onto the end face of the probe 2, ensuring a stable and reliable state. When it is necessary to replace the wear-resistant pad 4 worn due to dragging on a rough surface, the operator only needs to... The linkage ring 34 needs to be manually pressed down to drive the plunger 331 to reduce the negative pressure in the air extraction hole 313, thereby releasing the adsorption of the wear-resistant pad 4. This allows for the quick and easy adsorption and replacement of the wear-resistant pad 4. After placing the wear-resistant pad 4 in the pressed state, the plunger 331 is released, and the elastic sleeve 35 resets, causing the plunger 331 to move upward. This creates a negative pressure in the air extraction hole 313, adsorbing the wear-resistant pad 4, which greatly reduces the cost of use and maintenance. The circumferentially arranged petal-shaped protective plate 32 can effectively prevent the probe 2 from being damaged by bumps in complex testing environments.

[0045] The above are merely optional embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A protective structure for a corrosion coating thickness gauge, comprising a main unit (1) and a probe (2), wherein the main unit (1) and the probe (2) are electrically connected, characterized in that: A negative pressure clamp (3) is provided around the probe (2). A wear-resistant pad (4) is detachably attached to the end face of the probe (2) by means of the negative pressure clamp (3). The upper surface of the wear-resistant pad (4) is in contact with the end face of the probe (2). The negative pressure clamp (3) includes two semi-circular hoops (31) sleeved and fixed around the probe (2), and the two semi-circular hoops (31) are provided with sealing elements (36) on the side surface facing the wear-resistant gasket (4); The semi-ring hoop (31) is provided with two or more circumferentially distributed air extraction holes (313), each of the air extraction holes (313) is provided with an axially movable piston assembly, and all the piston assemblies are connected by a linkage ring (34). The outer wall of the probe (2) and the inner ring of the linkage ring (34) are stretched and connected by an elastic sleeve (35).

2. The protective structure for a corrosion coating thickness gauge according to claim 1, characterized in that: The piston assembly includes a piston rod (33), one end of which is fixedly connected to a plunger (331), and the outer wall of the plunger (331) and the inner wall of the air extraction hole (313) are in a sealed sliding connection.

3. The protective structure for a corrosion coating thickness gauge according to claim 1, characterized in that: The semi-ring hoop (31) has several guide holes (314) around the air extraction hole (313). The guide holes (314) have a first clamping plate (37) and a second clamping plate (38) at their axial ends respectively. Several screws (372) passing through the guide holes (314) are fixedly connected to the first clamping plate (37). One end of the screw (372) passes through the second clamping plate (38) and is threadedly connected to a nut (39).

4. The protective structure for a corrosion coating thickness gauge according to claim 1, characterized in that: The top outer ring of the elastic sleeve (35) is provided with a first fixing ring (351), and the bottom inner ring of the elastic sleeve (35) is provided with a second fixing ring (352).

5. The protective structure for a corrosion coating thickness gauge according to claim 1, characterized in that: The sealing element (36) is provided with a plurality of circular holes (361) for connecting the air extraction hole (313), and a circular groove (362) is provided on the lower end surface of the sealing element (36).

6. The protective structure for a corrosion coating thickness gauge according to claim 1, characterized in that: The probe (2) is fixedly connected to a protruding ring (21) on its periphery, and the inner ring of the semi-ring hoop (31) is provided with a positioning groove (312) for limiting the connection of the protruding ring (21) on the axis.

7. The protective structure for a corrosion coating thickness gauge according to claim 1, characterized in that: The semi-circular hoop (31) is provided with several outwardly curved petal-shaped protective plates (32).

8. The protective structure for a corrosion coating thickness gauge according to claim 3, characterized in that: Sealing gaskets (373) are clamped and connected between both ends of the semi-circular hoop (31) and the first clamping plate (37) and the second clamping plate (38).

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