A coating thickness detecting device for round pipe alloy welding

Abstract

The application relates to the technical field of coating thickness detection, in particular to a coating thickness detection device for round pipe alloy welding, which comprises a supporting rod, a base and a support are fixed on the surface of the supporting rod, a rolling shaft is arranged on the surface of the support, a sliding groove is arranged on the surface of the support, a sliding plate is arranged in the sliding groove, an extension block is fixed on the surface of the sliding plate, a U-shaped rod is inserted into the surface of the extension block, a first rolling ball is arranged at the end of the U-shaped rod, a top-holding block is arranged on the surface of the first rolling ball, a plug-in groove is arranged on the surface of the top-holding block, a second air cylinder is fixed on the surface of the extension block, and a second piston rod is arranged at the end of the second air cylinder. When the plug-in plate is located in the plug-in groove, the detection head is located in the outlet, and the detection head is in contact with the surface of the round pipe. At this time, the surface of the top-holding block is completely attached to the surface of the round pipe, so that the detection head can be well held on the surface of the round pipe, the coating of the round pipe is detected, and the detection process can be kept stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of coating thickness detection, in particular to a coating thickness detection device for round pipe alloy cladding. BACKGROUND

[0002] Cladding technology: using a cladding heat source to cladding a material with certain performance on the surface of the base (workpiece), forming a metallurgical bonding of a cladding (surfacing) process; The purpose of cladding is not to connect the welding parts, but to obtain a cladding (surfacing) metal layer with special properties such as wear resistance, heat resistance and corrosion resistance on the surface of the workpiece by using the method of cladding.

[0003] In the prior art, the patent number is CN212931311U, and the name is coating thickness measuring instrument, including coating thickness measuring instrument operation main body, external detection line, external line storage cover, the right side of the coating thickness measuring instrument operation main body is installed with external line storage cover;The inside of the external line storage cover is provided with external detection line;By increasing the external detection line, and the external detection line is arranged on the right side wall of the coating thickness measuring instrument operation main body by using the external detection storage cover, and the upper end of the external detection line is inserted into the inside of the coating thickness measuring instrument operation main body by the plug-in hole protection sleeve, and is connected with the detection unit inside it, so that the lower end with magnetic probe of it can be used for detecting the thickness of coating, so that the coating thickness measuring instrument operation main body has dual function, so that the staff will not appear unnecessary trouble caused by carrying the wrong type of coating thickness measuring instrument in the specific measurement process, and the occurrence of the situation that cannot be measured.

[0004] However, the existing round pipe is measured by manually holding the measuring instrument during transportation, which has low accuracy, and the surface of the round pipe is arc-shaped, so that the measuring instrument cannot be accurately held on the surface of the round pipe. SUMMARY

[0005] The present application aims to provide a coating thickness detection device for round pipe alloy cladding to solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a coating thickness detection device for round pipe alloy cladding, comprising:

[0007] The surface of the support rod is fixed with a base and a support, the surface of the support is provided with a rolling shaft, the surface of the support is provided with a sliding groove, the sliding groove is provided with a sliding plate, the surface of the sliding plate is fixed with an extension block, the surface of the extension block is inserted with a U-shaped rod, the end of the U-shaped rod is provided with a first rolling ball, the surface of the first rolling ball is provided with a holding block, the surface of the holding block is provided with a plug-in slot, the surface of the extension block is fixed with a second cylinder, and the end of the second cylinder is provided with a second piston rod.

[0008] Preferably, the surface of the support is provided with a plurality of rolling shafts capable of rolling on the surface of the support, a circular tube is placed on the top of the support and held on the surface of the rolling shaft, the rolling shaft can drive the circular tube to move on the top of the support after rolling, the surface of the support is fixed with a first cylinder, the end of the first cylinder is provided with a first piston rod, the first cylinder can drive the first piston rod to move, the other end of the first piston rod is fixed with a sliding block, the sliding block moves with the first piston rod, the surface of the support is fixed with two sets of limiting frames, the limiting frames are inserted into the inside of the sliding block, the sliding block can move outside the limiting frames, and the cross section of the limiting frame is T-shaped.

[0009] Preferably, the sliding plate can move in the sliding groove, the surface of the sliding plate is fixed with a plurality of extension blocks, the extension blocks move with the sliding plate, the inside of the sliding groove is fixed with an embedded plate, the embedded plate is provided with a plurality of groups located on both sides of the sliding groove, the surface of the embedded plate is provided with a receiving groove, one end of the receiving groove is connected with a rubber strip, the rubber strip is in a raised state, and the rubber strip can be retracted into the inside of the receiving groove after swinging along one end.

[0010] Preferably, the surface of the extension block is inserted with a U-shaped rod, the U-shaped rod can move in the inside of the extension block, the surface of the extension block is fixed with a second cylinder, the end of the second cylinder is provided with a second piston rod, the second cylinder can drive the second piston rod to move in and out, the other end of the second piston rod is connected with the surface of the U-shaped rod, the U-shaped rod moves with the second piston rod, and the end of the U-shaped rod moves in the inside of the extension block with the second piston rod.

[0011] Preferably, the other end of the U-shaped rod is fixed with a first rolling ball, the other end of the first rolling ball is located in the inside of the holding block, the first rolling ball can swing in the inside of the holding block, the surface of the first rolling ball is fixed with a limiting ring, the limiting ring swings with the first rolling ball, and the limiting ring can hold on the surface of the holding block when the first rolling ball swings, the holding block moves with the U-shaped rod, the holding block is provided with a plurality of groups, and the arc shapes of the surfaces of each group of holding blocks are inconsistent.

[0012] Preferably, the surface of the holding block is provided with a slot and a insertion slot, the surface of the sliding block is fixed with an L-shaped rod, the L-shaped rod moves with the sliding block, the other end of the L-shaped rod is fixed with a detector, the detector moves with the L-shaped rod, the surface of the detector is provided with a detection rod, the end of the detection rod is inserted with a telescopic rod, the telescopic rod can move in and out in the inside of the detection rod, the inside of the detection rod is provided with a spring, and the spring is connected with the inside of the detection rod and the end of the telescopic rod.

[0013] Preferably, the end of the telescopic rod is provided with a plug-in plate which moves along with the telescopic rod, the plug-in plate can be plugged into the plug-in slot, the telescopic rod is plugged into the slot, the telescopic rod can move in the slot, the end of the telescopic rod is fixed with a second rolling ball, the other end of the second rolling ball is located in the inside of the plug-in plate, and the second rolling ball can swing in the inside of the plug-in plate.

[0014] Preferably, the surface of the plug-in plate is plugged with a detection head which can move telescopically in the inside of the plug-in plate, the inside of the plug-in plate is provided with a second spring which is connected with the detection head and the inside of the plug-in plate, the second spring has a pushing force on the detection head, so that the detection head is extended out of the plug-in plate, and when the abutting block is abutted on the surface of the circular pipe, the end of the detection head is abutted on the surface of the circular pipe to detect the coating thickness of the circular pipe.

[0015] Preferably, the arc-shaped side surface of the abutting block is fixed with a rubber pad which moves along with the abutting block, the surface of the abutting block is provided with an extension opening, the detection head is plugged into the extension opening and can move in the extension opening, and the detection head contacts the surface of the circular pipe through the extension opening.

[0016] Preferably, the sliding groove is provided with a spring, one end of the spring is connected with the surface of the sliding plate, the other end is connected with the inner wall of the sliding groove, and the sliding groove has a pulling force on the sliding plate so that the sliding plate is located at one end of the sliding groove.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] The abutting block is provided with multiple groups, the arc shape of the surface of each group of abutting blocks is different, and is adapted to the arc of different circular pipes, when the circular pipe passes from one side of the abutting block, the second piston rod is retracted into the inside of the second cylinder by the second cylinder, the second piston rod drives the U-shaped rod to move, one end of the U-shaped rod is plugged into the inside of the extension block, the other end of the abutting block of the U-shaped rod moves along with the U-shaped rod, the abutting block approaches the surface of the circular pipe, the surface of the abutting block is abutted on the surface of the circular pipe, the end of the U-shaped rod is connected with the abutting block through the first rolling ball, the abutting block can slightly swing, the surface of the abutting block is adapted to the surface of the circular pipe, the end of the telescopic rod is connected with the plug-in plate through the second rolling ball, the plug-in plate can slightly swing, the plug-in plate slightly swings along with the abutting block, when the plug-in plate is located in the plug-in slot, the detection head is located in the extension opening and contacts the surface of the circular pipe, at this time, since the surface of the abutting block completely matches the surface of the circular pipe, the detection head can be well abutted on the surface of the circular pipe, the coating of the circular pipe is detected, and the detection process can be kept stable. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The present application is a structural schematic diagram.

[0020] Figure 2 Another perspective view of the structure of the present application.

[0021] Figure 3 A schematic view of the support structure of the present application.

[0022] Figure 4 A Figure 2 An enlarged view of the structure at A.

[0023] Figure 5 A schematic view of the support structure of the present application.

[0024] Figure 6 A Figure 5 An enlarged view of the structure at B.

[0025] Figure 7 A schematic view of the support structure of the present application.

[0026] Figure 8 A schematic view of the top holding block structure of the present application.

[0027] Figure 9 A Figure 7 An enlarged view of the structure at C.

[0028] Figure 10 A schematic view of the embedded plate structure of the present application.

[0029] In the figure: support rod 1, base 2, support 3, rolling shaft 4, circular tube 5, first cylinder 6, limiting frame 7, sliding block 8, first piston rod 9, sliding plate 10, sliding slot 11, slotted 12, limiting ring 13, first rolling ball 14, plug-in slot 15, extension block 17, second cylinder 18, U-shaped rod 19, second piston rod 20, L-shaped rod 21, spring 22, top holding block 23, outlet 24, rubber pad 25, detection head 26, plug-in plate 27, detector 28, detection rod 29, telescopic rod 30, rubber strip 31, storage groove 32, embedded plate 33, second rolling ball 34. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme of the present application clear, complete description, and the advantages are more clear and obvious, the following will be further described in detail by combining with the drawings. It should be understood that the specific embodiments described here are part of the embodiments of the present application, not all embodiments, only to explain the embodiments of the present application, and not for the purpose of limiting the embodiments of the present application, all other embodiments obtained by the person skilled in the art without doing creative work, belong to the scope of protection of the present application.

[0031] Please refer to Figures 1 to 10 , the present application provides a technical scheme:

[0032] The embodiment 1 is a coating thickness detection device for round pipe alloy welding, which comprises a support rod 1, a base 2 and a support 3 are fixed on the surface of the support rod 1, a rolling shaft 4 is arranged on the surface of the support 3, a sliding groove 11 is arranged on the surface of the support 3, a sliding plate 10 is arranged in the sliding groove 11, an extension block 17 is fixed on the surface of the sliding plate 10, a U-shaped rod 19 is inserted into the surface of the extension block 17, a first rolling ball 14 is arranged on the end of the U-shaped rod 19, a top holding block 23 is arranged on the surface of the first rolling ball 14, a plug-in groove 15 is arranged on the surface of the top holding block 23, a second cylinder 18 is fixed on the surface of the extension block 17, a second piston rod 20 is arranged on the end of the second cylinder 18, when the round pipe 5 passes from one side of the top holding block 23, the second piston rod 20 is pulled by the second cylinder 18, so that the second piston rod 20 is retracted into the inside of the second cylinder 18, the U-shaped rod 19 is moved by the second piston rod 20, and the top holding block 23 at the other end of the U-shaped rod 19 is moved with the U-shaped rod 19.

[0033] The embodiment 2 is based on the embodiment 1, a plurality of rolling shafts 4 are arranged on the surface of the support 3, the rolling shafts 4 can roll on the surface of the support 3, the round pipe 5 is placed on the top of the support 3, the round pipe 5 is held on the surface of the rolling shaft 4, the rolling shaft 4 can drive the round pipe 5 to move on the top of the support 3 after rolling, a first cylinder 6 is fixed on the surface of the support 3, a first piston rod 9 is arranged on the end of the first cylinder 6, the first cylinder 6 can drive the first piston rod 9 to move, a sliding block 8 is fixed on the other end of the first piston rod 9, the sliding block 8 moves with the first piston rod 9, two sets of limiting frames 7 are fixed on the surface of the support 3, the limiting frames 7 are inserted into the inside of the sliding block 8, the sliding block 8 can move outside the limiting frames 7, the cross section of the limiting frame 7 is T-shaped, the sliding block 8 is moved outside the limiting frame 7 by the first piston rod 9, and the limiting frame 7 plays a limiting role, and the sliding block 8 drives the detector 28 to move through the L-shaped rod 21.

[0034] The sliding plate 10 can move in the sliding groove 11, a plurality of extension blocks 17 are fixed on the surface of the sliding plate 10, the extension blocks 17 move with the sliding plate 10, an embedded plate 33 is fixed in the inside of the sliding groove 11, the embedded plate 33 is arranged in multiple groups and located on both sides of the sliding groove 11, a receiving groove 32 is arranged on the surface of the embedded plate 33, one end of the receiving groove 32 is connected with a rubber strip 31, the rubber strip 31 is in a raised state, and the rubber strip 31 can be retracted into the inside of the receiving groove 32 after swinging at one end, a spring 22 is arranged in the sliding groove 11, one end of the spring 22 is connected with the surface of the sliding plate 10, and the other end is connected with the inner wall of the sliding groove 11, the sliding groove 11 has a pulling force on the sliding plate 10, so that the sliding plate 10 is located at one end of the sliding groove 11.

[0035] The surface of the extension block 17 is inserted with the U-shaped rod 19, the U-shaped rod 19 can move inside the extension block 17, the surface of the extension block 17 is fixedly connected with the second cylinder 18, the end of the second cylinder 18 is provided with the second piston rod 20, the second cylinder 18 can drive the second piston rod 20 to move in and out, the other end of the second piston rod 20 is connected with the surface of the U-shaped rod 19, the U-shaped rod 19 moves along with the second piston rod 20, the end of the U-shaped rod 19 moves inside the extension block 17 along with the second piston rod 20, the other end of the U-shaped rod 19 is fixedly connected with the first rolling ball 14, the other end of the first rolling ball 14 is located inside the top-holding block 23, the first rolling ball 14 can swing inside the top-holding block 23, the surface of the first rolling ball 14 is fixedly connected with the limiting ring 13, the limiting ring 13 swings along with the first rolling ball 14, the limiting ring 13 can be supported on the surface of the top-holding block 23 when the first rolling ball 14 swings, the top-holding block 23 moves along with the U-shaped rod 19, the top-holding block 23 is provided with a plurality of groups, the arc surface of each group of the top-holding block 23 is inconsistent, the surface of the top-holding block 23 is provided with the slot 12 and the insertion slot 15, the surface of the sliding block 8 is fixedly connected with the L-shaped rod 21, the L-shaped rod 21 moves along with the sliding block 8, the other end of the L-shaped rod 21 is fixedly connected with the detector 28, the detector 28 moves along with the L-shaped rod 21, the surface of the detector 28 is provided with the detection rod 29, the end of the detection rod 29 is inserted with the telescopic rod 30, the telescopic rod 30 can move in and out inside the detection rod 29, the inside of the detection rod 29 is provided with the spring, the spring is connected with the inside of the detection rod 29 and the end of the telescopic rod 30, the end of the telescopic rod 30 is provided with the insertion plate 27, the insertion plate 27 moves along with the telescopic rod 30, the insertion plate 27 can be inserted into the insertion slot 15, and the telescopic rod 30 is inserted into the slot 12, the telescopic rod 30 can move in the slot 12, the end of the telescopic rod 30 is fixedly connected with the second rolling ball 34, the other end of the second rolling ball 34 is located inside the insertion plate 27, the second rolling ball 34 can swing inside the insertion plate 27, the surface of the insertion plate 27 is inserted with the detection head 26, the detection head 26 can move in and out inside the insertion plate 27, the inside of the insertion plate 27 is provided with the second spring, the second spring is connected with the detection head 26 and the inside of the insertion plate 27, the second spring has a pushing force on the detection head 26, so that the detection head 26 extends outside the insertion plate 27, and when the top-holding block 23 is supported on the surface of the circular pipe 5, the end of the detection head 26 is supported on the surface of the circular pipe 5 to detect the coating thickness of the circular pipe 5, the arc side surface of the top-holding block 23 is fixedly connected with the rubber pad 25, the rubber pad 25 moves along with the top-holding block 23, the surface of the top-holding block 23 is provided with the outlet 24, the detection head 26 is inserted into the outlet 24 and can move in the outlet 24, the detection head 26 contacts with the surface of the circular pipe 5 through the outlet 24, the end of the telescopic rod 30 is connected with the insertion plate 27 through the second rolling ball 34, so that the insertion plate 27 can swing slightly, and the insertion plate 27 swings slightly along with the top-holding block 23,When the plug-in plate 27 is located in the plug-in slot 15, the detection head 26 is located in the extension outlet 24, and the detection head 26 is in contact with the surface of the circular tube 5, at this time, because the surface of the top-holding block 23 is completely fitted with the surface of the circular tube 5, the detection head 26 can be well held on the surface of the circular tube 5.

[0036] The circular tube 5 is located at the top of the support 3, and the circular tube 5 is moved by the rotation of the rolling shaft 4, and the first piston rod 9 is driven to move by the first cylinder 6, the first piston rod 9 drives the sliding block 8 to move, the sliding block 8 moves outside the limiting frame 7, the limiting frame 7 plays a limiting role, the sliding block 8 drives the detector 28 to move through the L-shaped rod 21, the detection rod 29 at the end of the detector 28 is plugged with the telescopic rod 30, the other end of the telescopic rod 30 is provided with the plug-in plate 27, the surface of the plug-in plate 27 is provided with the detection head 26, the detection head 26 can detect the coating thickness, the plug-in plate 27 is plugged in the plug-in slot 15 on the surface of the top-holding block 23, and the telescopic rod 30 is plugged in the slot 12, the telescopic rod 30 can move from the slot 12, the top-holding block 23 is provided with a plurality of groups, the arc surface of each group of top-holding blocks 23 is different, and it is suitable for different arc of the circular tube 5, when the circular tube 5 passes from one side of the top-holding block 23, the second piston rod 20 is pulled by the second cylinder 18, so that the second piston rod 20 is retracted into the inside of the second cylinder 18, the second piston rod 20 drives the U-shaped rod 19 to move, one end of the U-shaped rod 19 is plugged into the inside of the extension block 17, so that the other end of the top-holding block 23 of the U-shaped rod 19 moves with the U-shaped rod 19, the top-holding block 23 is close to the surface of the circular tube 5, so that the surface of the top-holding block 23 is held on the surface of the circular tube 5, the end of the U-shaped rod 19 is connected with the top-holding block 23 through the first rolling ball 14, so that the top-holding block 23 can slightly swing, which is suitable for the surface of the circular tube 5, and the end of the telescopic rod 30 is connected with the plug-in plate 27 through the second rolling ball 34, so that the plug-in plate 27 can slightly swing, so that the plug-in plate 27 slightly swings with the top-holding block 23, when the plug-in plate 27 is located in the plug-in slot 15, the detection head 26 is located in the extension outlet 24, and the detection head 26 is in contact with the surface of the circular tube 5, at this time, because the surface of the top-holding block 23 is completely fitted with the surface of the circular tube 5, the detection head 26 can be well held on the surface of the circular tube 5, the coating of the circular tube 5 is detected, and the detection process can be kept stable.

[0037] Although the above describes the specific embodiments of the present application in order to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, all the application creations using the concept of the present application are within the protection scope of the present application as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims.

Claims

1. A round pipe alloy welding coating thickness detecting device, characterized by: The surface of the support (3) is provided with a plurality of groups of rolling shafts (4), the rolling shafts (4) can roll on the surface of the support (3), the top of the support (3) is provided with a circular tube (5), the circular tube (5) is supported on the surface of the rolling shaft (4), the rolling shaft (4) can drive the circular tube (5) to move on the top of the support (3) after rolling, the surface of the support (3) is fixedly provided with two groups of limiting frames (7), the limiting frames (7) are inserted into the inside of the sliding blocks (8), the sliding blocks (8) can move outside the limiting frames (7), and the limiting frames (7) are T-shaped in cross section. The utility model provides a support rod (1), the surface of support rod (1) is fixed with base (2) and support (3), the surface of support (3) is provided with rolling shaft (4), the surface of support (3) is opened with sliding slot (11), be provided with sliding plate (10) in sliding slot (11), the surface of sliding plate (10) is fixed with extension block (17), the surface of extension block (17) is inserted with U type rod (19), the end of U type rod (19) is provided with first rolling ball (14), the surface of first rolling ball (14) is provided with top holding block (23), the surface of extension block (17) is fixed with second pneumatic cylinder (18), the end of second pneumatic cylinder (18) is provided with second piston rod (20), the surface of support (3) is fixed with first pneumatic cylinder (6), the end of first pneumatic cylinder (6) is provided with first piston rod (9), first pneumatic cylinder (6) can drive first piston rod (9) to move, the other end of first piston rod (9) is fixed with sliding block (8), sliding block (8) moves along with first piston rod (9), U type rod (19) can move in the inside of extension block (17), second pneumatic cylinder (18) can drive second piston rod (20) to move in extension and contraction, the other end of second piston rod (20) is connected with the surface of U type rod (19), U type rod (19) moves along with second piston rod (20), the end of U type rod (19) moves in the inside of extension block (17) along with second piston rod (20), the surface of top holding block (23) is opened with slot (12) and insertion slot (15), the surface of sliding block (8) is fixed with L type rod (21), L type rod (21) moves along with sliding block (8), the other end of L type rod (21) is fixed with detector (28), detector (28) moves along with L type rod (21), the surface of detector (28) is provided with detection rod (29), the end of detection rod (29) is inserted with telescopic rod (30), telescopic rod (30) can move in extension and contraction in the inside of detection rod (29), the inside of detection rod (29) is provided with spring, spring is connected with the inside of detection rod (29) and the end of telescopic rod (30), the end of telescopic rod (30) is provided with insertion board (27), insertion board (27) moves along with telescopic rod (30), insertion board (27) can be inserted into insertion slot (15), and telescopic rod (30) is inserted in slot (12), telescopic rod (30) can move in slot (12), the end of telescopic rod (30) is fixed with second rolling ball (34), the other end of second rolling ball (34) is located in the inside of insertion board (27), second rolling ball (34) can swing in the inside of insertion board (27), the surface of insertion board (27) is inserted with detection head (26), detection head (26) can move in extension and contraction in the inside of insertion board (27), the inside of insertion board (27) is provided with second spring, second spring is connected with detection head (26) and the inside of insertion board (27), second spring has the thrust to detection head (26), makes detection head (26) extend the outside of insertion board (27),And the top holding block (23) is held on the surface of the pipe (5), and the end of the detection head (26) is held on the surface of the pipe (5), and the coating thickness of the pipe (5) is detected.

2. A pipe alloy overlay coating thickness detection apparatus according to claim 1, characterized in that: The sliding plate (10) can move in the sliding groove (11), the surface of the sliding plate (10) is fixedly provided with a plurality of groups of extension blocks (17), the extension blocks (17) move with the sliding plate (10), the inside of the sliding groove (11) is fixedly provided with a plurality of groups of embedded plates (33), the embedded plates (33) are located on both sides of the sliding groove (11), the surface of the embedded plate (33) is provided with a receiving groove (32), one end of the receiving groove (32) is connected with a rubber strip (31), the rubber strip (31) is in a raised state, and the rubber strip (31) can be retracted into the receiving groove (32) after swinging along one end.

3. A pipe alloy overlay coating thickness detection apparatus according to claim 2, wherein: The other end of the U-shaped rod (19) is fixedly provided with a first rolling ball (14), the other end of the first rolling ball (14) is located in the inside of the supporting block (23), the first rolling ball (14) can swing in the inside of the supporting block (23), the surface of the first rolling ball (14) is fixedly provided with a limiting ring (13), the limiting ring (13) swings with the first rolling ball (14), when the first rolling ball (14) swings, the limiting ring (13) can be supported on the surface of the supporting block (23), the supporting block (23) moves with the U-shaped rod (19), the supporting block (23) is provided with a plurality of groups, and the curved surfaces of each group of the supporting block (23) are different.

4. A coating thickness detection device for pipe alloy welding according to claim 3, characterized in that: The curved side surface of the supporting block (23) is fixedly provided with a rubber pad (25), the rubber pad (25) moves with the supporting block (23), the surface of the supporting block (23) is provided with an extension opening (24), a detection head (26) is inserted into the extension opening (24), and the detection head (26) can move in the extension opening (24), and the detection head (26) is in contact with the surface of the circular tube (5) through the extension opening (24).

5. A coating thickness probe for pipe alloy welding as defined in claim 4 wherein: The sliding groove (11) is provided with a spring (22), one end of the spring (22) is connected with the surface of the sliding plate (10), the other end is connected with the inner wall of the sliding groove (11), the sliding groove (11) has a pulling force on the sliding plate (10), so that the sliding plate (10) is located at one end of the sliding groove (11).

6. A pipe alloy overlay coating thickness detection apparatus as defined in claim 5 wherein: ​

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