Small-diameter tube hardness detection device

Abstract

The invention provides a small-diameter tube hardness detection device, and relates to the technical field of metal hardness detection. The small-diameter tube hardness detection device comprises a hardness detection rod which is provided with a pressure head and applies pressure to the tube wall of a small-diameter tube through the pressure head to form an indentation; the guide detection assembly is used for guiding the hardness detection rod to move within a set distance range; the adsorption fixing assembly is adsorbed and fixed on the pipe wall of the small-diameter pipe; the loading lever is provided with a connecting end and a control end, the connecting end is hinged to the adsorption fixing assembly, a rod body of the loading lever is movably connected with the hardness detection rod, and the hardness detection rod can be driven to move by controlling the control end of the loading lever; and the pressure detector is used for detecting the pressure applied to the small-diameter tube when the hardness detection rod moves in real time. The small-diameter tube hardness detection device provided by the invention solves the problem of lack of a small-diameter tube hardness detection instrument in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of metal hardness detection, and in particular to a small-diameter tube hardness detection device. Background Art

[0002] The existing hardness testing instruments mainly include Brinell hardness tester, Vickers hardness tester, Rockwell hardness tester and Leeb hardness tester. Brinell hardness tester, Vickers hardness tester and Rockwell hardness tester belong to the first type of hardness tester. The main principle is to compare and convert the pressure applied to the surface of the material being tested with the degree of indentation. Usually, the first type of hardness tester is used in laboratory conditions and can only perform hardness testing on samples that have been machined and meet the hardness tester testing requirements. The advantage is that the detection error is small, and the disadvantage is that the instrument cannot be used for on-site hardness testing of metal parts.

[0003] The second type of hardness tester is the Leeb hardness tester. The working principle of the Leeb hardness tester is the impact rebound method, which obtains the Leeb hardness value by the ratio of the impact velocity of the impact body to the rebound velocity. The advantage is that the instrument is small and flexible, suitable for on-site testing. The disadvantage is that the hardness value of the Leeb hardness tester has a large error and cannot be converted with the first type of hardness value, especially for the hardness test of small-diameter pipes, the hardness value obtained cannot be quantified.

[0004] In the process of monitoring metal pipes in power plants, the hardness value of small-diameter pipes such as boiler heating surface pipes and machine furnace external pipes is a key technical monitoring indicator. Its hardness value can directly reflect whether the pipe material is deteriorated, whether the quality of the welding joint is qualified, etc. However, the hardness tester of the existing technology is not suitable for on-site hardness testing of small-diameter pipes such as boiler heating surface pipes and machine furnace external pipes.

[0005] Therefore, there is an urgent need for a device that can solve at least one of the above problems. Summary of the invention

[0006] The purpose of the embodiment of the present invention is to provide a small-diameter tube hardness detection device, which is used to solve the problem of lack of small-diameter tube hardness detection instruments in the prior art.

[0007] In order to achieve the above object, the present invention provides a small-diameter tube hardness detection device, the small-diameter tube hardness detection device comprising: A hardness detection rod having an indenter, wherein the hardness detection rod can move toward the tube wall of the small-diameter tube and apply pressure to the tube wall of the small-diameter tube through the indenter to form an indentation on the tube wall; A guide detection assembly is arranged on the wall of the small-diameter tube, the hardness detection rod is movably connected to the guide detection assembly, and the guide detection assembly is used to guide the hardness detection rod to move within a set distance range; Adsorption fixing component, which can be adsorbed and fixed on the wall of small diameter pipe; A loading lever having a connecting end and a control end, wherein the connecting end of the loading lever is hinged on the adsorption and fixing assembly, and the rod body of the loading lever is movably connected to the hardness detection rod, and the control end of the loading lever can be manipulated to drive the hardness detection rod to move; The pressure detector is arranged on the hardness detection rod and is used for detecting in real time the pressure applied to the small-diameter tube when the hardness detection rod moves.

[0008] Specifically, the guide detection assembly includes: a guide box, a pair of stoppers and a limit block; The guide box is fitted on the wall of the small-diameter tube, and a guide hole is provided on the guide box. The hardness detection rod is slidably arranged in the guide hole, and the pressure detector is arranged on the hardness detection rod and located in the guide box; A pair of stoppers are disposed in the guide box; The limit block is arranged on the hardness detection rod, and the limit block can limit the moving range of the hardness detection rod when it moves between a pair of stoppers.

[0009] Specifically, the guide detection assembly further includes: a guide sleeve, which is nested in the guide hole, and the hardness detection rod is slidably disposed in the guide sleeve.

[0010] Specifically, the guide detection assembly also includes: a return spring, which is sleeved on the hardness detection rod and located in the guide box.

[0011] Specifically, a rubber lining pad is arranged on the fitting surface of the guide box.

[0012] Specifically, the adsorption and fixing assembly includes: an adsorption box, a negative pressure exhaust fan and a hinged seat; The adsorption box has an air extraction cavity, the adsorption box is adsorbed on the wall of the small-diameter tube, and an adsorption hole is opened on the side of the adsorption box that contacts the small-diameter tube, and the adsorption hole is connected to the air extraction cavity; The negative pressure vacuum pump is arranged in the vacuum chamber, and the vacuum box is adsorbed on the small diameter tube by extracting the air in the vacuum chamber; The hinged seat is arranged on the adsorption box, and the connecting end of the loading lever is hinged to the hinged seat.

[0013] Specifically, the contact surfaces of the adsorption box and the guide box are both in line with the shape of the outer tube wall of the small-diameter tube.

[0014] Specifically, a sealing rubber pad is provided on the fitting surface of the adsorption box.

[0015] Specifically, the small-diameter tube hardness detection device further includes: a display device, which is arranged on the adsorption box and is connected to the pressure detector signal for displaying the real-time pressure value.

[0016] Specifically, a plurality of connecting pins are arranged on the rod body of the loading lever, and the hardness detection rod can be movably connected to the rod body of the loading lever through any connecting pin.

[0017] The small-diameter tube hardness detection device provided by the present invention has an adsorption fixing component that can be adsorbed on the tube wall of the small-diameter tube, a hardness detection rod is slidably arranged on the guide detection component, the hardness detection rod is guided to move along the radial direction of the small-diameter tube through the guide detection component, and the moving range of the hardness detection rod is limited within a set distance range, the connecting end of the loading lever is hinged with the adsorption fixing component, the rod body of the loading lever is movably connected with the hardness detection rod, when detecting the hardness of the small-diameter tube, the adsorption fixing component is first adsorbed on the tube wall of the small-diameter tube, and the guide detection component is attached to the tube wall of the small-diameter tube, and the control end of the loading lever is manipulated to make the loading lever move around the tube wall of the small-diameter tube. The adsorption fixing component rotates at the hinge, and the loading lever drives the hardness detection rod to move within a set distance along the radial direction of the small-diameter tube to apply pressure to the tube wall of the small-diameter tube through the pressure head. Under the action of pressure, an indentation will be formed on the tube wall of the small-diameter tube. While the hardness detection rod moves within the set distance to apply pressure to the tube wall of the small-diameter tube, the pressure value is detected in real time by the pressure detector, and the maximum pressure value detected when moving within the set distance is selected as the test force for hardness calculation. The hardness value of the small-diameter tube is calculated based on the maximum pressure value and the diagonal length of the indentation, which solves the problem of lack of small-diameter tube hardness detection instruments in the prior art.

[0018] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of a small-diameter tube hardness detection device provided by the present invention; Figure 2 It is a structural schematic diagram of a guide detection component in a small-diameter tube hardness detection device provided by the present invention; Figure 3 yes Figure 2 A-direction view; Figure 4 It is a structural schematic diagram of the adsorption and fixing component in the small-diameter tube hardness detection device provided by the present invention.

[0020] Description of Reference Numerals 1-hardness detection rod; 2-small diameter tube; 3-guide detection assembly; 4-adsorption fixing assembly; 5-loading lever; 6-pressure detector; 7-display instrument; 31-guide box; 32-guide sleeve; 33-reset spring; 41-adsorption box; 42-negative pressure exhaust fan; 43-hinged seat. DETAILED DESCRIPTION

[0021] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0022] Figure 1 It is a structural schematic diagram of a small diameter tube hardness testing device; Figure 2 It is a structural schematic diagram of the guide detection component in the small-diameter tube hardness detection device; Figure 3 yes Figure 2 A-direction view; Figure 4 It is a structural schematic diagram of the adsorption and fixing components in the small-diameter tube hardness testing device.

[0023] like Figure 1-Figure 4 As shown, the small-diameter tube hardness detection device provided by the present invention comprises: A hardness testing rod 1 having an indenter, the hardness testing rod 1 can move toward the wall of the small-diameter tube 2, and apply pressure to the wall of the small-diameter tube 2 through the indenter to form an indentation on the wall; The guide detection component 3 is arranged on the wall of the small-diameter tube 2, and the hardness detection rod 1 is movably connected to the guide detection component 3. The guide detection component 3 is used to guide the hardness detection rod 1 to move within a set distance range; The adsorption fixing component 4 can be adsorbed and fixed on the wall of the small-diameter tube 2; The loading lever 5 has a connecting end and a control end. The connecting end of the loading lever 5 is hingedly arranged on the adsorption and fixing assembly 4. The rod body of the loading lever 5 is movably connected with the hardness detection rod 1. Manipulating the control end of the loading lever 5 can drive the hardness detection rod 1 to move. The pressure detector 6 is arranged on the hardness detection rod 1 and is used for detecting in real time the pressure applied to the small-diameter tube 2 by the hardness detection rod 1 when it moves.

[0024] The small diameter tube hardness detection device provided by the present invention is as follows: Figure 1As shown, the hardness detection rod 1 is slidably set on the guide detection component 3, and the hardness detection rod 1 is guided by the guide detection component 3 to move within a set distance range along the radial direction of the small-diameter tube 2. In order to control the movement of the hardness detection rod 1, an adsorption and fixing component 4 and a loading lever 5 are set. The adsorption and fixing component 4 can be adsorbed and fixed on the outer tube wall of the small-diameter tube 2, and one end of the loading lever 5 is hinged to the adsorption and fixing component 4, and the rod body of the loading lever 5 is movably connected to the hardness detection rod 1. When using the small-diameter tube hardness detection device to detect the hardness of the small-diameter tube 2, the adsorption and fixing component 4 is first adsorbed on the tube wall of the small-diameter tube 2, and the guide detection component 3 is made to fit the tube wall of the small-diameter tube 2, and the control end of the loading lever 5 is manipulated to make the loading lever 5 rotate around the hinge with the adsorption and fixing component 4, thereby driving the hardness detection rod 1 to move toward the tube wall of the small-diameter tube 2 and applying pressure to the tube wall of the small-diameter tube 2 through the pressure head of the hardness detection rod 1. The pressure of the hardness detection rod 1 The head squeezes the wall of the small-diameter tube 2 to form an indentation on the small-diameter tube 2. The indenter is a diamond quadrangular pyramid indenter. The moving direction of the hardness detection rod 1 is guided by the guide detection component 3, and the hardness detection rod 1 is limited to move within a set distance range along the radial direction of the small-diameter tube 2. The pressure value applied by the indenter to the small-diameter tube 2 when the hardness detection rod 1 moves within the set distance range is detected in real time by the pressure detector 6. After that, the staff selects the largest pressure value among the detected pressure values ​​as the test force F for calculating the hardness of the small-diameter tube, and measures the diagonal length d of the indentation. The Vickers hardness calculation formula is: HV=0.1891×F / d², wherein H is the Vickers hardness value, in units of HV; F is the test force, in units of N; d is the arithmetic mean of the two diagonal lengths of the indentation. The Vickers hardness of the small-diameter tube 2 is calculated according to the detected pressure value and the arithmetic mean of the diagonal length of the indentation, which solves the problem of the lack of small-diameter tube hardness detection instruments in the prior art.

[0025] In one embodiment, Figure 2-Figure 3 As shown, the guide detection assembly 3 includes: a guide box 31, a pair of stoppers and a limit block; The guide box 31 is fitted on the wall of the small-diameter tube 2, and a guide hole is provided on the guide box 31. The hardness detection rod 1 is slidably arranged in the guide hole. The pressure detector 6 is arranged on the hardness detection rod 1 and is located in the guide box 31. A pair of stoppers are disposed in the guide box 31; The limit block is arranged on the hardness detection rod 1 , and the limit block can limit the moving range of the hardness detection rod 1 by moving between a pair of stoppers.

[0026] The guide detection assembly 3 further includes: a guide sleeve 32 nested in the guide hole, and the hardness detection rod 1 is slidably disposed in the guide sleeve 32 .

[0027] The guide detection assembly 3 further includes: a return spring 33 , which is sleeved on the hardness detection rod 1 and located in the guide box 31 .

[0028] The fitting surface of the guide box 31 is provided with a rubber lining pad.

[0029] In order to form an indentation on the tube wall of the small-diameter tube 2 so as to calculate the hardness of the small-diameter tube 2 later, the guide box 31 of the guide detection assembly 3 is fitted on the tube wall of the small-diameter tube 2, and the side of the guide box 31 in contact with the small-diameter tube 2 is the fitting surface. In order to prevent the guide box 31 from moving randomly when the guide box 31 is fitted on the tube wall of the small-diameter tube 2, a rubber pad is lined on the fitting surface between the guide box 31 and the small-diameter tube 2. The rubber pad is used to increase the friction between the guide box 31 and the tube wall of the small-diameter tube 2 to prevent the guide box 31 from moving randomly. The fitting surface between the guide box 31 and the small-diameter tube 2 is consistent with the shape of the outer tube wall of the small-diameter tube 2, and the fitting surface between the guide box 31 and the small-diameter tube 2 is provided with a through hole for the pressure head of the hardness detection rod 1 to pass through, such as Figure 2 As shown, a guide hole is opened on the guide box 31, and a guide sleeve 32 is embedded in the guide hole. The hardness detection rod 1 is slidably set on the guide sleeve 32, and the moving direction of the hardness detection rod 1 is guided by the guide sleeve 32. A pair of blocks are set in the guide box 31, and the pair of blocks are detachably set in the guide box 31. The spacing between the pair of blocks is a set distance. One end of the limit block is fixed on the hardness detection rod 1, and the other end is located between the pair of blocks. When the hardness detection rod 1 moves radially in the small-diameter tube 2, the limit block moves synchronously with the hardness detection rod 1 between the pair of blocks. By setting the upper limit block on the hardness detection rod 1 to move between the pair of blocks, the hardness detection rod 1 can be limited to move within the set distance range. The pressure detector 6 detects the pressure value applied to the small-diameter tube 2 when the hardness detection rod 1 moves within the set distance between the pair of blocks.

[0030] In another embodiment, a guide groove is provided in the guide box 31. When the fitting surface of the guide box 31 fits against the tube wall of the small-diameter tube 2, the extension direction of the guide groove is consistent with the radial direction of the small-diameter tube 2. A pair of blocks are detachably provided in the guide groove. The spacing between the pair of blocks is adjusted to a set distance. The end of the limit block away from the hardness detection rod 1 extends into the guide groove. When the hardness detection rod 1 moves along the radial direction of the small-diameter tube 2, the limit block moves along the extension direction of the guide groove with the hardness detection rod 1, and the moving range of the limit block is limited to the set distance by the pair of blocks, that is, the moving range of the hardness detection rod 1 is within the set distance.

[0031] When the loading lever 5 is operated to drive the pressure head on the hardness detection rod 1 to apply pressure to the wall of the small-diameter tube 2, the reset spring 33 is compressed. After the pressure on the wall of the small-diameter tube 2 stops, the reset spring 33 resets the pressure head on the hardness detection rod 1 under the action of the spring force.

[0032] In order to conveniently use the small-diameter tube hardness detection device to detect the hardness of the small-diameter tube 2, the adsorption fixing assembly 4 includes: an adsorption box 41, a negative pressure exhaust fan 42 and a hinge seat 43; The adsorption box 41 has an air extraction cavity. The adsorption box 41 is adsorbed on the wall of the small-diameter tube 2. The adsorption box 41 has an adsorption hole on the side in contact with the small-diameter tube 2. The adsorption hole is connected to the air extraction cavity. The negative pressure vacuum pump 42 is disposed in the vacuum chamber, and the vacuum box 41 is adsorbed on the small diameter tube 2 by extracting the air in the vacuum chamber; The hinge seat 43 is disposed on the adsorption box 41 , and the connecting end of the loading lever 5 is hinged to the hinge seat 43 .

[0033] The contact surfaces of the adsorption box 41 and the guide box 31 are both in conformity with the outer wall shape of the small-diameter tube 2 .

[0034] The fitting surface of the adsorption box 41 is provided with a sealing rubber pad.

[0035] like Figure 4 As shown, when testing the hardness of the small-diameter tube 2, the adsorption box 41 is first attached to one side of the tube wall of the small-diameter tube 2 as the attachment surface. When the small-diameter tube 2 is a round tube, the attachment surface between the adsorption box 41 and the small-diameter tube 2 is an arc-shaped surface. Adsorption holes are provided on the attachment surfaces between the adsorption box 41 and the small-diameter tube 2. The adsorption holes are connected to the suction cavity of the adsorption box 41. The gas in the suction cavity is extracted by the negative pressure exhaust fan 42 to form a negative pressure cavity, so that the adsorption box 41 is firmly adsorbed on the surface of the small-diameter tube 2. In order to ensure the adsorption firmness of the adsorption box 41, before the adsorption box 41 is adsorbed on the small-diameter tube 2, it can be first The adsorption position on the small-diameter tube 2 is polished to make the surface of the adsorption position smooth for easy adsorption, or a liquid with higher viscosity is applied to the adsorption position to smooth out the unevenness at the adsorption position with the applied liquid, thereby ensuring that the adsorption box 41 can be firmly adsorbed on the small-diameter tube 2; in order to prevent air from entering the vacuum chamber between the small-diameter tube 2 and the adsorption hole and affecting the adsorption firmness of the adsorption box 41, a sealing pad is provided on the fitting surface of the adsorption box 41 and the small-diameter tube 2, and an adsorption through hole corresponding to the adsorption hole is opened on the sealing pad, so that air is prevented from entering the vacuum chamber through the adsorption hole.

[0036] An articulated seat 43 is provided on the adsorption box 41, and the connecting end of the loading lever 5 is articulated with the articulated seat 43. After the air in the adsorption chamber is extracted to adsorb the adsorption box 41 on the small-diameter tube 2, the guide box 31 is fitted on the tube wall of the small-diameter tube 2, and the control end of the loading lever 5 is manipulated to make the hardness detection rod 1 move along the radial direction of the small-diameter tube 2 to apply pressure to the tube wall surface of the small-diameter tube 2 through the pressure head. The pressure detector 6 detects the pressure value in real time and transmits the detected pressure value to the display 7. The display 7 is provided on the adsorption box 41 and is connected to the signal of the pressure detector 6 to display the real-time pressure value. The staff selects the maximum pressure value as the test force according to the pressure value displayed by the display 7, and then measures the diagonal length of the indentation. The Vickers hardness value of the small-diameter tube 2 is calculated based on the arithmetic mean of the maximum pressure value and the diagonal length of the indentation.

[0037] like Figure 1 As shown, in order to facilitate the connection between the hardness detection rod 1 and the rod body of the loading lever 5, a plurality of connecting pins are arranged on the rod body of the loading lever 5, and the hardness detection rod 1 can be movably connected to the rod body of the loading lever 5 through any connecting pin. Pin holes matching the size of the connecting pins are provided on the rod body of the loading lever 5 and the hardness detection rod 1, as shown in FIG. Figure 2-Figure 3 As shown, the pin hole of the hardness detection rod 1 is opened at the end of the hardness detection rod 1 away from the pressure head, and the connecting pin on the loading lever 5 passes through the corresponding pin hole on the hardness detection rod 1 to connect the loading lever 5 and the hardness detection rod 1.

[0038] The small-diameter tube hardness detection device provided by the present invention has an adsorption fixing component that can be adsorbed on the tube wall of the small-diameter tube, a hardness detection rod is slidably arranged on the guide detection component, the hardness detection rod is guided to move along the radial direction of the small-diameter tube through the guide detection component, and the moving range of the hardness detection rod is limited within a set distance range, the connecting end of the loading lever is hinged with the adsorption fixing component, the rod body of the loading lever is movably connected with the hardness detection rod, when detecting the hardness of the small-diameter tube, the adsorption fixing component is first adsorbed on the tube wall of the small-diameter tube, and the guide detection component is attached to the tube wall of the small-diameter tube, and the control end of the loading lever is manipulated to make the loading lever move around the tube wall of the small-diameter tube. The adsorption fixing component rotates at the hinge, and the loading lever drives the hardness detection rod to move within a set distance along the radial direction of the small-diameter tube to apply pressure to the tube wall of the small-diameter tube through the pressure head. Under the action of pressure, an indentation will be formed on the tube wall of the small-diameter tube. While the hardness detection rod moves within the set distance to apply pressure to the tube wall of the small-diameter tube, the pressure value is detected in real time by the pressure detector, and the maximum pressure value detected when moving within the set distance is selected as the test force for hardness calculation. The hardness value of the small-diameter tube is calculated based on the maximum pressure value and the diagonal length of the indentation, which solves the problem of lack of small-diameter tube hardness detection instruments in the prior art.

[0039] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0040] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0041] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A small diameter tube hardness testing device, characterized in that: The small diameter tube hardness detection device comprises: A hardness detection rod (1) having an indenter, wherein the hardness detection rod (1) is capable of moving toward the tube wall of the small-diameter tube (2) and applying pressure to the tube wall of the small-diameter tube (2) through the indenter to form an indentation on the tube wall; A guide detection component (3) is arranged in close contact with the wall of the small-diameter tube (2); the hardness detection rod (1) is movably connected to the guide detection component (3); the guide detection component (3) is used to guide the hardness detection rod (1) to move within a set distance range; An adsorption fixing component (4) capable of being adsorbed and fixed on the wall of the small-diameter tube (2); A loading lever (5) has a connecting end and a control end, the connecting end of the loading lever (5) being hinged on the adsorption fixing assembly (4), the rod body of the loading lever (5) being movably connected to the hardness detection rod (1), and manipulating the control end of the loading lever (5) can drive the hardness detection rod (1) to move; A pressure detector (6) is arranged on the hardness detection rod (1) and is used to detect in real time the pressure applied to the small-diameter tube (2) when the hardness detection rod (1) moves.

2. The small diameter tube hardness detection device according to claim 1, characterized in that: The guide detection assembly (3) comprises: a guide box (31), a pair of stop blocks and a limit block; The guide box (31) is fitted on the wall of the small-diameter tube (2), a guide hole is provided on the guide box (31), the hardness detection rod (1) is slidably disposed in the guide hole, and the pressure detector (6) is disposed on the hardness detection rod (1) and is located in the guide box (31); A pair of stoppers are arranged in the guide box (31); The limit block is arranged on the hardness detection rod (1), and the limit block can limit the movement range of the hardness detection rod (1) by moving between a pair of stop blocks.

3. The small diameter tube hardness detection device according to claim 2, characterized in that: The guide detection assembly (3) further comprises: a guide sleeve (32) nested in the guide hole, and the hardness detection rod (1) is slidably disposed in the guide sleeve (32).

4. The small diameter tube hardness detection device according to claim 2, characterized in that: The guide detection assembly (3) further comprises: a return spring (33) which is sleeved on the hardness detection rod (1) and is located in the guide box (31).

5. The small diameter tube hardness testing device according to claim 2, characterized in that: The fitting surface of the guide box (31) is provided with a rubber lining pad.

6. The small diameter tube hardness testing device according to claim 2, characterized in that: The adsorption fixing assembly (4) comprises: an adsorption box (41), a negative pressure exhaust fan (42) and a hinge seat (43); The adsorption box (41) has an air extraction cavity, the adsorption box (41) is adsorbed on the tube wall of the small-diameter tube (2), and an adsorption hole is provided on the side of the adsorption box (41) in contact with the small-diameter tube (2), the adsorption hole being in communication with the air extraction cavity; The negative pressure air pump (42) is arranged in the air pumping cavity, and allows the adsorption box (41) to be adsorbed on the small diameter tube (2) by extracting air in the air pumping cavity; The hinge seat (43) is arranged on the adsorption box (41), and the connection end of the loading lever (5) is hinged to the hinge seat (43).

7. The small diameter tube hardness testing device according to claim 6, characterized in that: The fitting surfaces of the adsorption box (41) and the guide box (31) both match the shape of the outer tube wall of the small-diameter tube (2).

8. The small diameter tube hardness testing device according to claim 6, characterized in that: The fitting surface of the adsorption box (41) is provided with a sealing rubber pad.

9. The small diameter tube hardness testing device according to claim 6, characterized in that: The small-diameter tube hardness detection device further comprises: a display instrument (7), which is arranged on the adsorption box (41) and is connected to the pressure detection instrument (6) by signal, and is used to display a real-time pressure value.

10. The small diameter tube hardness testing device according to claim 1, characterized in that: A plurality of connecting pins are arranged on the rod body of the loading lever (5), and the hardness detection rod (1) can be movably connected to the rod body of the loading lever (5) via any connecting pin.

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