Boiler steel tube strength testing device and special-shaped high-pressure boiler steel tube testing process

Abstract

The present invention relates to the technical field of detection equipment, specifically to a strength detection device for boiler steel pipes and a detection process for special-shaped high-pressure boiler steel pipes, comprising: a control box, and support columns fixed on the control box and symmetrically arranged, a fixed support frame fixed on the top of the support column; a movable support frame, slidably mounted on the support column, a stretching assembly connected to the movable support frame is arranged on the control box; a multi-directional clamping mechanism, respectively arranged on the movable support frame and the fixed support frame, a clamping plate is connected to the multi-directional clamping mechanism, a plurality of limit blocks equidistantly distributed are fixed on the clamping plate, and a yield detection structure is arranged on the multi-directional clamping mechanism; a spacing adjustment mechanism, respectively arranged on the movable support frame and the fixed support frame and connected to the multi-directional clamping mechanism. The present application can fix the steel pipe by multi-directional clamping to ensure that the tensile test result of the steel pipe is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of detection equipment, in particular to a strength detection device for a boiler steel tube and a detection process for a special-shaped high-pressure boiler steel tube. Background Art

[0002] Boiler steel pipes refer to steel materials with openings at both ends and a hollow section, with a large ratio of length to circumference. According to the production method, they can be divided into seamless steel pipes and welded steel pipes.

[0003] The strength of steel pipes is tested to ensure product quality. Different grades of steel pipes have different load-bearing capacities. Usually, the strength value is calculated based on a series of standard test methods. The strength of steel pipes is related to many factors, including the composition and material of the steel pipe, processing technology, etc.

[0004] The tensile test is a standard method for measuring the mechanical properties of steel pipes. It measures the strength by stretching the steel pipe until it breaks. Existing tensile strength tests usually use equipment to provide annular clamping force on the steel pipe and apply tension to the steel pipe after it is fixed. However, since the steel pipe is only clamped by friction, it may cause displacement when the steel pipe is subjected to tension, resulting in inaccurate tensile strength test results of the steel pipe. Summary of the invention

[0005] The purpose of the present invention is to provide a strength detection device for boiler steel tubes and a detection process for special-shaped high-pressure boiler steel tubes to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The strength testing device for boiler steel tubes includes:

[0008] A control box, and support columns fixedly mounted on the control box and symmetrically arranged, with a fixed support frame fixed on the top of the support column;

[0009] Also includes:

[0010] A movable support frame is slidably mounted on the support column, and a stretching assembly connected to the movable support frame is provided on the control box, and the stretching assembly can drive the movable support frame to move toward or away from the fixed support frame;

[0011] A multi-directional clamping mechanism is respectively arranged on the movable support frame and the fixed support frame, the multi-directional clamping mechanism is connected with a clamping plate, a plurality of limit blocks equidistantly distributed are fixed on the clamping plate, and a yield detection structure is arranged on the multi-directional clamping mechanism;

[0012] The spacing regulating mechanism is respectively arranged on the movable support frame and the fixed support frame and connected to the multi-directional clamping mechanism. The spacing regulating mechanism can adjust the spacing between the clamping plates through the multi-directional clamping mechanism.

[0013] As a further solution of the present invention: the stretching assembly includes a screw rod rotatably mounted on the control box, a threaded sleeve matching the screw rod thread is slidably mounted on the screw rod, a guide rod is fixed on the control box, a guide sleeve is slidably mounted on the guide rod, and the guide sleeve and the threaded sleeve are fixedly connected to the movable support frame.

[0014] As a further solution of the present invention: the multi-directional clamping mechanism includes fixed rods respectively fixedly mounted on the fixed support frame and the movable support frame, and the ends of the fixed rods are fixed with limit plates, and the limit plates are provided with sliding components.

[0015] As a further solution of the present invention: the sliding assembly includes a plurality of sliding grooves which are opened on the limiting plate and are equidistantly distributed around the circumference, a sliding block is slidably installed in the sliding groove, a movable plate is fixed on the sliding block, an inclined plate is fixed on the side wall of the movable plate, and an elastic structure connected to the clamping plate is arranged on the movable plate.

[0016] As a further solution of the present invention: the elastic structure includes a supporting sleeve fixedly installed on the movable plate, a movable rod penetrating the movable plate is slidably installed in the supporting sleeve, the end of the movable rod is fixedly connected to the clamping plate, and the movable rod is sleeved with a spring that abuts the clamping plate.

[0017] As a further solution of the present invention: the yield detection structure includes a detection wheel rotatably mounted on the movable plate.

[0018] As a further solution of the present invention: the spacing adjustment mechanism includes a worm gear rotatably mounted on the fixed support frame and the movable support frame respectively, and a rotating rod rotatably mounted on the fixed support frame and the movable support frame respectively, a worm wheel is fixedly mounted on the rotating rod, the worm wheel is meshed with the worm gear, and a guide assembly connected to the sliding block is provided on the rotating rod.

[0019] As a further solution of the present invention: the guide assembly includes a rotating disk fixedly installed at the end of the rotating rod, the rotating disk is provided with a vortex groove, and the sliding block is fixed with a limiting column slidably connected to the vortex groove.

[0020] The inspection process of special-shaped high-pressure boiler steel tubes includes the following steps:

[0021] Step 1: Cut the steel pipe to be tested into the required size for testing, and place the steel pipe between the fixed support frame and the movable support frame;

[0022] Step 2: In the initial state, the distance between the clamping plates is the largest. At this time, the multi-directional clamping mechanism can be driven to move by the distance control mechanism, so that the clamping plates and the limit blocks move in a direction close to each other;

[0023] Step 3: When the limit block moves to the position where it abuts against the steel pipe to be tested, the multi-directional clamping mechanism can be controlled to continue moving until the detection structure moves to the position where it abuts against the steel pipe. Under the action of the multi-directional clamping mechanism and the limit block, ensure that both ends of the steel pipe are fixed;

[0024] Step 4: At this time, the movable support frame can be driven by the stretching assembly to move in a direction away from the fixed support frame, and the steel pipe can be stretched by the limit block and the multi-directional clamping mechanism until the steel pipe breaks. At this time, the tensile strength can be calculated to confirm the strength of the steel pipe.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the present application can perform multi-directional fixation on the steel pipe through a multi-directional clamping mechanism to ensure that the position of the steel pipe does not change; when the spacing control mechanism moves, it drives the multi-directional clamping mechanism to move, so that the clamping plate and the limit block move toward each other; when the limit block and the multi-directional clamping mechanism move to a position that fits the surface of the steel pipe, the steel pipe will be subjected to multiple forces to ensure that the position of the steel pipe does not change; at this time, the movable support frame can be driven by the stretching assembly to move in a direction away from the fixed support frame, so that a tensile force is applied to the steel pipe through the multi-directional clamping mechanism, thereby performing tensile testing on the steel pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a schematic structural diagram of an embodiment of a strength detection device for a boiler steel tube.

[0027] Figure 2 It is a structural schematic diagram of another angle in the embodiment of the strength detection device for boiler steel tube.

[0028] Figure 3 It is a schematic diagram of the structure inside the fixed support frame in an embodiment of the strength detection device for boiler steel pipe.

[0029] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at point A in the middle.

[0030] Figure 5 It is a schematic diagram of the structure inside the movable support frame in an embodiment of the strength detection device for boiler steel pipes.

[0031] Figure 6It is a schematic diagram of the connection relationship between the multi-directional clamping mechanism and the spacing control mechanism in the embodiment of the strength detection device for boiler steel tubes.

[0032] Figure 7 for Figure 6 Schematic diagram of the half-section structure.

[0033] Figure 8 It is a schematic diagram of the exploded structure of part of the spacing control mechanism and part of the multi-directional clamping mechanism in the embodiment of the strength detection device for boiler steel tube.

[0034] Fig. 9 It is a structural schematic diagram of a multi-directional clamping mechanism and a yield detection structure in an embodiment of a strength detection device for a boiler steel tube.

[0035] Fig.10 It is a schematic diagram of the exploded structure of the multi-directional clamping mechanism and the clamping plate in the embodiment of the strength detection device for boiler steel tube.

[0036] In the figure: 1. control box; 2. support column; 3. fixed support frame; 4. worm; 5. rotating rod; 6. worm wheel; 7. rotating disk; 8. vortex groove; 9. fixed rod; 10. limit plate; 11. slide groove; 12. sliding block; 13. limit column; 14. movable plate; 15. tilting plate; 16. detection wheel; 17. support sleeve; 18. movable rod; 19. spring; 20. clamping plate; 2001, limit block; 21. screw rod; 22. threaded sleeve; 23. movable support frame; 24. guide rod; 25. guide sleeve. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0039] See also Figure 1 to Figure 10 In an embodiment of the present invention, a strength detection device for a boiler steel tube comprises:

[0040] A control box 1, and support columns 2 fixedly mounted on the control box 1 and symmetrically arranged, with a fixed support frame 3 fixed on the top of the support column 2;

[0041] Also includes:

[0042] See also Figure 1 , Figure 2 , a movable support frame 23 is slidably mounted on the support column 2, and a stretching assembly connected to the movable support frame 23 is provided on the control box 1, and the stretching assembly can drive the movable support frame 23 to move toward or away from the fixed support frame 3, and the stretching assembly includes a screw rod 21 rotatably mounted on the control box 1, and a threaded sleeve 22 threadedly matched with the screw rod 21 is slidably mounted on the screw rod 21, a guide rod 24 is fixed on the control box 1, and a guide sleeve 25 is slidably mounted on the guide rod 24, and the guide sleeve 25 and the threaded sleeve 22 are fixedly connected to the movable support frame 23.

[0043] In detail, the strength test of steel pipes is to ensure product quality. Steel pipes of different grades have different load bearing capacities. Usually, the strength value is calculated based on a series of standard test methods. The strength of steel pipes is related to many factors, including the composition and material of the steel pipes, processing technology, etc. Therefore, before the steel pipes are used, they need to be subjected to tensile tests. The tensile test is a standard method for measuring the mechanical properties of steel pipes. It measures the strength by stretching the steel pipes until they break. Therefore, when testing the steel pipes, the steel pipes to be tested can be cut into the required size according to the test requirements, and the cut steel pipes are placed between the fixed support frame 3 and the movable support frame 23. Under the action of the multi-directional clamping mechanism, the clamping plate 20 and the limit block 2001, the two ends of the steel pipes are fixed.

[0044] Preferably, a motor for controlling the rotation of the screw rod 21 is installed in the control box 1. When the two ends of the steel pipe are fixed, the motor works and drives the screw rod 21 to rotate, thereby moving through the threaded sleeve 22. The threaded sleeve 22 will also drive the guide sleeve 25 to move along the length direction of the guide rod 24 through the movable support frame 23. The guide sleeve 25 and the guide rod 24 have a guiding function to ensure that the threaded sleeve 22 moves along the length direction of the screw rod 21 and will not rotate with the screw rod 21. The movable support frame 23 will also drive the multi-directional clamping mechanism and the limit block 2001 to move to stretch the steel pipe. As the screw rod 21 rotates, the tensile force on the steel pipe increases until the tensile force of the steel pipe reaches the maximum, and the steel pipe will break. At this time, the strength of the steel pipe can be measured according to the tensile force provided to the steel pipe.

[0045] See also Figure 1-Figure 7 , Fig. 9 , Fig.10, a multi-directional clamping mechanism is respectively arranged on the movable support frame 23 and the fixed support frame 3, the multi-directional clamping mechanism is connected with a clamping plate 20, and a plurality of limit blocks 2001 distributed at equal distances are fixed on the clamping plate 20, the multi-directional clamping mechanism includes a fixed rod 9 respectively fixedly installed on the fixed support frame 3 and the movable support frame 23, a limit plate 10 is fixed at the end of the fixed rod 9, and a sliding component is arranged on the limit plate 10, wherein the sliding component includes a plurality of slide grooves 11 opened on the limit plate 10 and distributed at equal distances around the circumference, A sliding block 12 is slidably installed in the sliding groove 11, a movable plate 14 is fixed on the sliding block 12, an inclined plate 15 is fixed on the side wall of the movable plate 14, and an elastic structure connected to the clamping plate 20 is provided on the movable plate 14. The elastic structure mentioned above includes a supporting sleeve 17 fixedly installed on the movable plate 14, a movable rod 18 penetrating the movable plate 14 is slidably installed in the supporting sleeve 17, an end of the movable rod 18 is fixedly connected to the clamping plate 20, and a spring 19 abutting against the clamping plate 20 is sleeved on the movable rod 18.

[0046] It should be noted that the inclined plate 15 is arranged in an inclined shape, and three slide grooves 11 are opened, so that the clamping plates 20 also have three, and the inclination angle is in the direction of the clamping plates 20. When the tensile strength of the steel pipe is tested, the two ends of the steel pipe need to be fixed. In the initial state, under the action of the spacing adjustment mechanism, the sliding block 12 is located at the end of the stroke on one side of the slide groove 11, so that the spacing between the sliding blocks 12 is the largest, and the spring 19 is in a compressed state, so that the movable rod 18 is located at the end of the stroke away from the support sleeve 17. At this time, the spacing between the clamping plate 20 and the limit block 2001 is greater than the size of the steel pipe. When the steel pipe needs to be fixed, the steel pipe can be placed between the three clamping plates 20. Under the action of the spacing adjustment mechanism, the sliding block 12 moves along the length direction of the slide groove 11. The sliding block 12 will also drive the movable plate 14 to move, and under the action of the movable plate 14, the support sleeve 17 and the inclined plate 15 are driven to move. The support sleeve 17 will also drive the movable rod 18 through the spring 19. The movement causes the distance between the clamping plate 20 and the limit block 2001 to gradually decrease. When the limit block 2001 moves to the position in contact with the surface of the steel pipe, the inclined plate 15 has not yet contacted the steel pipe. At this time, the sliding block 12 continues to move, and under the action of the movable plate 14, the inclined plate 15 continues to move toward the steel pipe. At the same time, the compression amount of the spring 19 gradually increases, so that the clamping force of the limit block 2001 on the steel pipe gradually increases. Since the limit block 2001 can only provide the steel pipe with annular clamping force through friction, Therefore, when the inclined plate 15 moves to a position in contact with the surface of the steel pipe, the inclined plate 15 provides an annular clamping force to the steel pipe and provides a driving force to move away from the center of the steel pipe. Under the action of the limit block 2001 and the inclined plate 15, the steel pipe is subjected to clamping forces in multiple directions to ensure that the position of the steel pipe does not change. At this time, the movable support frame 23 can be controlled by the screw rod 21 to move in a direction away from the fixed support frame 3 to perform a tensile strength test on the steel pipe.

[0047] See also Figure 3-Figure 7 , Fig. 9 , Fig.10 The multi-directional clamping mechanism is provided with a yielding detection structure, and the yielding detection structure includes a detection wheel 16 rotatably mounted on the movable plate 14.

[0048] Furthermore, the inclined plate 15 and the detection wheel 16 are located in the same vertical plane. When the inclined plate 15 moves to a position in contact with the surface of the steel pipe, the detection wheel 16 will also move to a position in contact with the surface of the steel pipe. Under the action of the detection wheel 16, the circumferential clamping force on the steel pipe will also be increased. When the steel pipe is tested, the tension on the steel pipe gradually increases. If the clamping force provided by the limit block 2001 and the inclined plate 15 is less than the tension of the steel pipe, the steel pipe will be displaced between the limit block 2001 and the inclined plate 15. Since the displacement is small, the inspector may not be able to observe it with the naked eye. When the steel pipe is displaced, the tensile strength test result will be inaccurate. Therefore, paint can be applied to the surface of the detection wheel 16. When the steel pipe is displaced, the detection wheel 16 will be driven to rotate, and the paint will adhere to the surface of the steel pipe, so as to achieve the effect of timely detecting whether the steel pipe is displaced during the testing process, thereby ensuring the accuracy of the strength test.

[0049] See also Figure 5-Figure 7 , a spacing adjustment mechanism is respectively arranged on the movable support frame 23 and the fixed support frame 3 and connected to the multi-directional clamping mechanism, and the spacing adjustment mechanism can adjust the spacing between the clamping plates 20 through the multi-directional clamping mechanism, and the spacing adjustment mechanism includes a worm 4 rotatably installed on the fixed support frame 3 and the movable support frame 23, and a rotating rod 5 is rotatably installed on the fixed support frame 3 and the movable support frame 23, and a worm wheel 6 is fixedly installed on the rotating rod 5, and the worm wheel 6 is meshed with the worm 4, and a guide assembly connected to the sliding block 12 is provided on the rotating rod 5, wherein the guide assembly includes a rotating disk 7 fixedly installed on the end of the rotating rod 5, and a vortex groove 8 is opened on the rotating disk 7, and a limiting column 13 slidably connected to the vortex groove 8 is fixed on the sliding block 12.

[0050] To go further, in the initial state, under the action of the vortex groove 8, the sliding block 12 is controlled by the limit column 13 to be located at the end of the stroke on one side of the slide groove 11, so that the spacing between the sliding blocks 12 is maximized. When the end of the steel pipe needs to be fixed, the worm 4 can be controlled to rotate by a motor arranged on the outer wall of the fixed support frame 3 and the movable support frame 23. The worm 4 will also drive the worm gear 6 meshing with it to rotate. Under the action of the worm gear 6, the rotating rod 5 is driven to rotate, thereby driving the rotating disk 7 to rotate. The rotating disk 7 will also drive the vortex groove 8 to move. Under the action of the vortex groove 8, the limit column 13 moves to drive the sliding block 12 to move along the length direction of the slide groove 11. The sliding block 12 will also drive the inclined plate 15 to move through the movable plate 14. When the inclined plate 15 moves to fit closely with the surface of the steel pipe, the steel pipe is fixed under the action of the inclined plate 15. At this time, the worm 4 stops rotating.

[0051] Preferably, since the worm 4 and the worm wheel 6 have a self-locking effect, it can be ensured that when the worm 4 stops rotating, the position of the sliding block 12 will not change, thereby ensuring that the position of the steel pipe will not change.

[0052] The inspection process of special-shaped high-pressure boiler steel tubes includes the following steps:

[0053] Step 1: Cut the steel pipe to be tested into the required size for testing, and place the steel pipe between the fixed support frame 3 and the movable support frame 23;

[0054] Step 2: In the initial state, the distance between the clamping plates 20 is the largest. At this time, the multi-directional clamping mechanism can be driven to move by the distance control mechanism, so that the clamping plates 20 and the limit blocks 2001 move toward each other;

[0055] Step 3: When the limit block 2001 moves to the position where it contacts the steel pipe to be tested, the multi-directional clamping mechanism can be controlled to continue to move until the detection structure moves to the position where it contacts the steel pipe. Under the action of the multi-directional clamping mechanism and the limit block 2001, both ends of the steel pipe are ensured to be fixed;

[0056] Step 4: At this time, the movable support frame 23 can be driven by the stretching assembly to move in a direction away from the fixed support frame 3, and the steel pipe can be stretched by the limit block 2001 and the multi-directional clamping mechanism until the steel pipe breaks. At this time, the tensile strength can be calculated to confirm the strength of the steel pipe.

[0057] Taking the embodiment combining all the features recorded in the present application as an example, when in use, in the initial state, the sliding block 12 is located at the end of the stroke on one side of the slide groove 11, so that the distance between the sliding blocks 12 is the largest, and the spring 19 is in a compressed state, so that the movable rod 18 is located at the end of the stroke away from the supporting sleeve 17. At this time, the distance between the clamping plate 20 and the limit block 2001 is larger than the size of the steel pipe. When the steel pipe needs to be fixed, the steel pipe can be placed between the three clamping plates 20. At this time, the worm 4 rotates, and the worm 4 will also drive the worm wheel 6 meshing with it to rotate. Under the action of the worm wheel 6, the rotating rod 5 is driven to rotate, thereby driving the rotating disk 7 to rotate. The rotating disk 7 will also drive the vortex groove 8 to move. Under the action of the vortex groove 8, the limit column 13 moves. The sliding block 12 moves along the length direction of the slide groove 11, and the sliding block 12 also drives the movable plate 14 to move, and under the action of the movable plate 14, drives the support sleeve 17 and the inclined plate 15 to move. The support sleeve 17 also drives the movable rod 18 to move through the spring 19, so that the distance between the clamping plate 20 and the limit block 2001 is gradually reduced. When the limit block 2001 moves to a position in contact with the surface of the steel pipe, the inclined plate 15 has not yet been in contact with the steel pipe. At this time, the sliding block 12 continues to move, and under the action of the movable plate 14, drives the inclined plate 15 to continue to move toward the direction of the steel pipe. At the same time, the compression amount of the spring 19 gradually increases, so that the clamping force of the limit block 2001 on the steel pipe gradually increases. Since the limit block 2001 can only be moved by friction The force provides annular clamping force to the steel pipe. Therefore, when the inclined plate 15 moves to a position in contact with the surface of the steel pipe, under the action of the inclined plate 15, while providing annular clamping force to the steel pipe, it provides a driving force moving away from the center of the steel pipe. Under the action of the limit block 2001 and the inclined plate 15, the steel pipe is subjected to clamping forces in multiple directions to ensure that the position of the steel pipe does not change. At this time, the motor works and drives the screw rod 21 to rotate, thereby moving through the threaded sleeve 22. The threaded sleeve 22 also drives the guide sleeve 25 to move along the length direction of the guide rod 24 through the movable support frame 23. The guide sleeve 25 and the guide rod 24 have a guiding function to ensure that the threaded sleeve 22 moves along the length direction of the screw rod 21 and does not follow the screw rod. 21 rotates, the movable support frame 23 will also drive the multi-directional clamping mechanism and the limit block 2001 to move, so as to stretch the steel pipe. As the screw rod 21 rotates, the tensile force on the steel pipe increases until the tensile force of the steel pipe reaches the maximum, and the steel pipe will break. At this time, the strength of the steel pipe can be measured according to the tensile force provided to the steel pipe. If the clamping force provided by the limit block 2001 and the inclined plate 15 is less than the tensile force of the steel pipe, the steel pipe will be displaced between the limit block 2001 and the inclined plate 15. Due to the small displacement, the inspection personnel may not be able to observe it with the naked eye. When the steel pipe is displaced, the tensile strength test result will be inaccurate. Therefore, paint can be applied on the surface of the inspection wheel 16. When the steel pipe is displaced, the inspection wheel 16 is driven to rotate.The paint will adhere to the surface of the steel pipe, so as to detect whether the steel pipe has been displaced in time during the inspection process, and ensure the accuracy of the strength test.

[0058] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0059] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. Boiler steel tube strength testing device, including: A control box, and support columns fixedly mounted on the control box and symmetrically arranged, with a fixed support frame fixed on the top of the support column; It is characterized by further comprising: A movable support frame is slidably mounted on the support column, and a stretching assembly connected to the movable support frame is provided on the control box, and the stretching assembly can drive the movable support frame to move toward or away from the fixed support frame; A multi-directional clamping mechanism is respectively arranged on the movable support frame and the fixed support frame, the multi-directional clamping mechanism is connected with a clamping plate, a plurality of limit blocks equidistantly distributed are fixed on the clamping plate, and a yield detection structure is arranged on the multi-directional clamping mechanism; A spacing regulating mechanism, which is respectively arranged on the movable support frame and the fixed support frame and connected to the multi-directional clamping mechanism, and the spacing regulating mechanism can adjust the spacing between the clamping plates through the multi-directional clamping mechanism; The multi-directional clamping mechanism comprises fixed rods respectively fixedly mounted on the fixed support frame and the movable support frame, the ends of the fixed rods are fixed with limit plates, and the limit plates are provided with sliding components; The sliding assembly comprises a plurality of slide grooves which are arranged on the limit plate and are equidistantly distributed around the circumference, a sliding block is slidably installed in the slide groove, a movable plate is fixed on the sliding block, an inclined plate is fixed on the side wall of the movable plate, and an elastic structure connected to the clamping plate is arranged on the movable plate; When the inclined plate moves to a position in contact with the surface of the steel pipe, the inclined plate provides a circumferential clamping force on the steel pipe and a driving force to move away from the center of the steel pipe. The elastic structure comprises a support sleeve fixedly mounted on the movable plate, a movable rod penetrating the movable plate is slidably mounted in the support sleeve, an end of the movable rod is fixedly connected to the clamping plate, and a spring is sleeved on the movable rod to abut against the clamping plate; The yield detection structure comprises a detection wheel rotatably mounted on the movable plate.

2. The strength detection device for boiler steel tube according to claim 1, characterized in that: The stretching assembly includes a screw rod rotatably mounted on the control box, a threaded sleeve matching the screw rod thread is slidably mounted on the screw rod, a guide rod is fixed on the control box, a guide sleeve is slidably mounted on the guide rod, and the guide sleeve and the threaded sleeve are fixedly connected to the movable support frame.

3. The strength detection device for boiler steel tube according to claim 1, characterized in that: The spacing adjustment mechanism includes a worm screw rotatably mounted on the fixed support frame and the movable support frame respectively, and a rotating rod rotatably mounted on the fixed support frame and the movable support frame respectively, a worm wheel is fixedly mounted on the rotating rod, the worm wheel is meshed with the worm screw, and a guide assembly connected to the sliding block is provided on the rotating rod.

4. The strength detection device for boiler steel tube according to claim 3, characterized in that: The guide assembly comprises a rotating disk fixedly mounted on the end of the rotating rod, a spiral groove is formed on the rotating disk, and a limiting column slidably connected to the spiral groove is fixed on the sliding block.

5. A testing process for special-shaped high-pressure boiler steel tubes, using a strength testing device for boiler steel tubes as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Cut the steel pipe to be tested into the required size for testing, and place the steel pipe between the fixed support frame and the movable support frame; Step 2: In the initial state, the distance between the clamping plates is the largest. At this time, the multi-directional clamping mechanism can be driven to move by the distance control mechanism, so that the clamping plates and the limit blocks move in a direction close to each other; Step 3: When the limit block moves to the position where it abuts against the steel pipe to be tested, the multi-directional clamping mechanism can be controlled to continue moving until the detection structure moves to the position where it abuts against the steel pipe. Under the action of the multi-directional clamping mechanism and the limit block, ensure that both ends of the steel pipe are fixed; Step 4: At this time, the movable support frame can be driven by the stretching assembly to move in a direction away from the fixed support frame, and the steel pipe can be stretched by the limit block and the multi-directional clamping mechanism until the steel pipe breaks. At this time, the tensile strength can be calculated to confirm the strength of the steel pipe.

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