A stainless steel seamless pipe stretching device and stretching method

Abstract

The invention discloses a stainless steel seamless pipe stretching device and a stretching method, which relate to the technical field of stainless steel pipe processing, and include a testing machine main body, a lifting component, and a sensor component. A connecting frame is installed at one end where two of the sensor components are close to each other, and the inner wall of the connecting frame is fixedly connected with an inner cylinder body, and support shells are arranged at equal distances inside the inner cylinder body. When performing a clamping test on the seamless pipe, the stainless steel seamless pipe stretching device can drive a rotating rod to rotate by a driving motor after clamping the outer wall of the seamless pipe, and push four support shells outward from the inner cylinder body to fit and extrude with the inner wall of the seamless pipe to support the inner pipe wall of the seamless pipe, thereby avoiding concave deformation at the clamping part of the seamless pipe due to excessive force during the stretching process, ensuring the stability of the device during the stretching test, and helping to improve the accuracy and reliability of the test results.

Description

Technical Field

[0001] The invention relates to the technical field of stainless steel pipe processing, in particular to a stainless steel seamless pipe stretching device and a stretching method. Background Art

[0002] Stainless steel seamless pipe is a long strip of steel with a hollow cross-section and no seams around it. It is resistant to corrosion by weak corrosive media such as air, steam, and water, and chemically corrosive media such as acids, alkalis, and salts. It is also called stainless acid-resistant steel pipe. Stainless steel seamless pipe is mainly used in industrial pipelines such as petroleum, chemical, medical, food, light industry, mechanical instruments, and mechanical structural components. In the production and sales process of seamless pipes, it is usually necessary to provide a mechanical properties test report of the product, and the tensile test results are one of the important contents in these reports, which is of great significance for product certification and market access.

[0003] At present, when conducting tensile tests on seamless pipes, a tensile testing machine is generally used to clamp and fix the two ends of the pipe, and the sample is stretched at a constant speed until the sample breaks. During the test, the force value, displacement and other data calculation results displayed by the tensile device are recorded, and the tensile strength, yield strength, elongation and cross-sectional shrinkage are calculated based on the recorded data and the original size of the sample. However, traditional steel pipe clamps are mainly clamped by clamping the outer wall or the side wall of the steel pipe. During stretching, the two ends of the steel pipe are easily deformed, resulting in a smaller contact area between the seamless pipe and the clamp, resulting in slippage, which requires the replacement of a new seamless pipe for retesting, which not only affects the efficiency of the tensile test, but also causes additional material loss. Summary of the invention

[0004] The object of the present invention is to provide a stainless steel seamless pipe stretching device and a stretching method to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides a stainless steel seamless pipe stretching method comprising the following steps:

[0006] Stable clamping: The driving motor is used to drive the rotating rod to rotate. Under the restriction of the extrusion block by the limiting rod, the four extrusion blocks can move downward synchronously through the cooperation of the ball and the spiral groove, so that the inclined surface of the extrusion block can move and guide the support shell, and the four support shells are pushed outward from the inner cylinder to fit and extrude with the inner wall of the seamless pipe to support the inner wall of the seamless pipe;

[0007] Alarm and friction increase: When slippage occurs, the trigger block will move relatively, causing the pressure value of the pressure sensor to rise. When the set value is reached, a signal will be issued to alarm. At the same time, during the slippage process, the trigger block uses a pull rope to spray the adhesive in the liquid storage cylinder through the nozzle on the subsequent sliding path of the support shell, thereby improving the friction performance between the support shell and the seamless pipe, reducing the possibility of slippage, and ensuring the smooth progress of the tensile test;

[0008] Reverse rolling: During the slipping process of the supporting shell, the cooperation between the gear rod and the transmission gear can drive several rubber wheels that are pressed against the inner wall of the seamless pipe to rotate, and the rotation direction is opposite to the slipping direction, so as to reduce the slipping speed during the clamping process, so that the adhesive has more time to fully react, ensuring the friction-increasing effect of the adhesive and extending the clamping time, which is conducive to the smooth success of the tensile test.

[0009] To achieve the above-mentioned object, the present invention also provides a stainless steel seamless pipe stretching device, comprising a testing machine body, a lifting component, and a sensor component, wherein a connecting frame is installed at one end of the two sensor components close to each other, and an inner cylinder is fixedly connected to the inner wall of the connecting frame, and a support shell is arranged at equal distances inside the inner cylinder, and a telescopic groove is penetrated and opened on the outer wall of the inner cylinder corresponding to the support shell;

[0010] A supporting mechanism is provided inside the inner cylinder to support the inner wall of the seamless pipe during the tensile test to prevent the clamping part of the seamless pipe from being sunken and deformed;

[0011] The inner wall of the support shell is provided with a friction-increasing alarm mechanism, so that during the tensile test, adhesive can be sprayed on the subsequent sliding path when slipping occurs, and a sensing alarm can be performed after slipping a certain distance;

[0012] The two side walls of the support shell are provided with a reversal auxiliary mechanism so as to reduce the slipping speed during the clamping process when slipping occurs during the tensile test.

[0013] Preferably, the supporting mechanism includes a rotating rod, and the top of the rotating rod is rotatably connected to the inner wall of the connecting frame, the outer wall of the rotating rod is provided with extrusion blocks at equal distances corresponding to the supporting shell, and the outer wall of the rotating rod is provided with spiral grooves at equal distances, one side wall of the extrusion block is fixedly connected with a ball corresponding to the spiral groove, and the outer wall of the ball slides in contact with the inner wall of the spiral groove, a limiting rod is provided on the top of the extrusion block, and the bottom of the extrusion block is in the shape of an inclined surface.

[0014] Preferably, a support rod is fixedly connected to one side wall of the support shell facing the rotating rod, and a support groove is provided on the outer wall of the rotating rod at equal distances corresponding to the support rod, the outer wall of the support rod slides in fit with the inner wall of the support groove, and the support rod is a square rod, and a groove is provided on one side wall of the extrusion block corresponding to the friction-increasing alarm mechanism.

[0015] Preferably, the outer wall of the rotating rod is fixedly connected to a driven gear, the top of the connecting frame is fixedly installed with a driving motor, and one end of the output shaft of the driving motor is fixedly connected to the driving gear, the outer wall of the inner cylinder is provided with a through groove corresponding to the driving gear, and one side of the driving gear is meshed and matched with one side of the driven gear.

[0016] Preferably, the friction-increasing alarm mechanism includes a trigger block, and the outer wall of the trigger block slides in fit with the inner wall of the support shell, a pressure sensor is fixedly installed on the bottom inner wall of the support shell, a compression spring is fixedly connected to the bottom of the trigger block corresponding to the pressure sensor, and the trigger block is made of rubber, the inner wall of the inner cylinder is fixedly connected to a liquid storage cylinder at an equal distance corresponding to the support shell, and a piston is slideably connected to the inner wall of the liquid storage cylinder, a pull rope is fixedly connected to the bottom center of the piston, and the other end of the pull rope is fixedly connected to the top of the trigger block.

[0017] Preferably, a nozzle is fixedly connected to one side wall of the liquid storage cylinder, a through hole is opened on the outer wall of the inner cylinder corresponding to the nozzle, and the inner wall of the nozzle is connected to the interior of the liquid storage cylinder, the top of the limiting rod is fixedly connected to the bottom of the liquid storage cylinder, and the outer wall of the limiting rod slides in fit with the interior of the extrusion block.

[0018] Preferably, the reversal auxiliary mechanism includes a slider, and a side wall of the two sliders that are close to each other is fixedly connected to the two side walls of the trigger block, and the two side walls of the support shell are provided with sliding grooves corresponding to the sliders, and the outer wall of the slider slides in contact with the inner wall of the sliding groove, and the two side walls of the support shell are rotatably connected to a shaft rod, and the outer wall of the shaft rod is fixedly connected to a rubber wheel, and the other end of the shaft rod is fixedly connected to a limiting disk corresponding to the rubber wheel.

[0019] Preferably, the outer wall of the shaft is fixedly connected to a transmission gear, a side wall of the slider is fixedly connected to a connecting rod, and the other end of the connecting rod is fixedly connected to a gear rod corresponding to the transmission gear, a side wall of the gear rod is meshed with the transmission gear, and a slot 2 is opened through the inner wall of the telescopic slot corresponding to the gear rod.

[0020] Preferably, clamping blocks are provided on both inner walls of the connecting frame, and electric push rods are fixedly installed on both outer walls of the connecting frame, and an output rod at one end of the electric push rod passes through the interior of the connecting frame and is fixedly connected to one side wall of the clamping blocks.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. When the seamless pipe is clamped, after the outer wall of the seamless pipe is clamped, the rotating rod is driven by the driving motor to rotate, and the four supporting shells are pushed outward from the inner cylinder to fit and extrude with the inner wall of the seamless pipe, so as to support the inner wall of the seamless pipe, avoid the concave deformation of the clamping part of the seamless pipe due to excessive force during the stretching process, ensure the stability of the device during the tensile test, and help to improve the accuracy and reliability of the test results.

[0023] 2. When the seamless pipe is clamped, after the four support shells are pressed against the inner wall of the seamless pipe, when slippage occurs, the trigger block can be squeezed by the inner wall of the seamless pipe, so that the trigger block moves relatively, so as to pull the pull rope, and the adhesive in the liquid storage cylinder is sprayed through the nozzle on the subsequent sliding path of the support shell, so as to further improve the friction performance between the support shell and the seamless pipe, and the pressure sensor can be used to sense and alarm after slipping a certain distance, so as to avoid the impact force or tension caused by sudden slippage from causing harm to the operator, thereby ensuring the stability of the device during the tensile test.

[0024] 3. When the seamless pipe is clamped, the trigger block can be moved relatively, and the gear rod can be used to drive multiple rubber wheels that are pressed against the inner wall of the seamless pipe to rotate, and the rotation direction is opposite to the slipping direction, so as to reduce the slipping speed during the clamping process, so that the adhesive has more time to fully react, ensuring the friction-increasing effect of the adhesive, and extending the clamping time, which is conducive to the smooth success of the tensile test, thereby ensuring the stability of the device during the tensile test. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a tensile test flow chart of the present invention;

[0026] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure inside the overall inner cylinder of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the support mechanism of the present invention;

[0030] Figure 6 It is a structural schematic diagram of the first part of the friction increase alarm mechanism of the present invention;

[0031] Figure 7 It is a structural schematic diagram of the second part of the friction-increasing alarm mechanism of the present invention;

[0032] Figure 8 It is a structural schematic diagram of the reversal auxiliary mechanism of the present invention.

[0033] In the figure: 1. Testing machine body; 2. Lifting component; 3. Sensor component; 4. Connecting frame; 5. Inner cylinder; 6. Support shell; 10. Driven gear; 11. Driving motor; 12. Driving gear; 13. Through slot; 14. Telescopic slot; 15. Through hole; 16. Slide slot; 17. Notch 2; 18. Clamping block; 19. Electric push rod; 7. Support mechanism; 701. Rotating rod; 702. Extrusion block; 703. Spiral slot; 704. Ball; 705. Limiting rod; 706, supporting rod; 707, supporting groove; 708, notch one; 8, friction-increasing alarm mechanism; 801, trigger block; 802, compression spring; 803, pressure sensor; 804, liquid storage cylinder; 805, piston; 806, pull rope; 807, nozzle; 9, reversing auxiliary mechanism; 901, slider; 902, shaft; 903, rubber wheel; 904, limiting disk; 905, transmission gear; 906, connecting rod; 907, gear rod. DETAILED DESCRIPTION

[0034] 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.

[0035] For example, see Figure 1-Figure 8 The present invention provides a stainless steel seamless pipe stretching device, comprising a testing machine body 1, a lifting component 2, and a sensor component 3. A connecting frame 4 is installed at one end of two sensor components 3 that are close to each other, and an inner cylinder 5 is fixedly connected to the inner wall of the connecting frame 4. A supporting shell 6 is arranged at equal distances inside the inner cylinder 5, and a telescopic groove 14 is penetrated and opened on the outer wall of the inner cylinder 5 corresponding to the supporting shell 6;

[0036] A support mechanism 7 is provided inside the inner cylinder 5. Further, the support mechanism 7 includes a rotating rod 701, and the top of the rotating rod 701 is rotatably connected to the inner wall of the connecting frame 4. The outer wall of the rotating rod 701 is provided with an extrusion block 702 at an equal distance corresponding to the support shell 6, and the outer wall of the rotating rod 701 is provided with a spiral groove 703 at an equal distance. A side wall of the extrusion block 702 is fixedly connected with a ball 704 corresponding to the spiral groove 703, and the outer wall of the ball 704 is fitted and slid with the inner wall of the spiral groove 703. A limiting rod 705 is provided on the top of the extrusion block 702, and the bottom of the extrusion block 702 is inclined.

[0037] Furthermore, the above-mentioned testing machine body 1 and its components, including the lifting component 2 and the sensor component 3, and the pressure sensor 803 used subsequently, are all existing technology products and can be purchased and used in major markets. Therefore, their specific working principles will not be further described here.

[0038] In this embodiment, when the seamless pipe sample is subjected to a tensile test, the clamping position distance is first marked at both ends of the seamless pipe with a caliper to match the clamping range of the clamping block 18, and then the seamless pipe is vertically placed between the two lifting components 2, and then the two lifting components 2 are controlled to approach each other by a certain distance, so that the inner cylinder 5 is extended into the inner walls of both ends of the seamless pipe, and then the electric push rod 19 is used to drive the clamping blocks 18 at the upper and lower positions to perform preliminary clamping and support on the seamless pipe, at which time the operator can end the support of the seamless pipe;

[0039] At this time, the driven gear 10 is fixedly connected to the outer wall of the rotating rod 701, and the driving motor 11 is fixedly installed on the top of the connecting frame 4, and the output shaft at one end of the driving motor 11 is fixedly connected to the driving gear 12, and at the same time, the outer wall of the inner cylinder 5 is provided with a through groove 13 corresponding to the driving gear 12, and one side of the driving gear 12 is meshed with one side of the driven gear 10, so that the driving motor 11 can be used to drive the rotating rod 701 to rotate, and then the spiral grooves 703 are equidistantly opened on the outer wall of the rotating rod 701, and one side of the extrusion block 702 is The side wall corresponds to the spiral groove 703 and is fixedly connected with a ball 704, and the outer wall of the ball 704 fits and slides with the inner wall of the spiral groove 703. At the same time, a limiting rod 705 is provided on the top of the extrusion block 702, and the top of the limiting rod 705 is fixedly connected to the bottom of the liquid storage cylinder 804, and the outer wall of the limiting rod 705 fits and slides with the inside of the extrusion block 702. Therefore, under the restriction of the limiting rod 705 on the extrusion block 702, the cooperation of the ball 704 and the spiral groove 703 enables the four extrusion blocks 702 to move downward synchronously;

[0040] Then, a support rod 706 is fixedly connected to one side wall of the support shell 6 toward the rotating rod 701, and a support groove 707 is provided at an equal distance on the outer wall of the rotating rod 701 corresponding to the support rod 706, and the outer wall of the support rod 706 fits and slides with the inner wall of the support groove 707, and at the same time, the support rod 706 is a square rod, and a telescopic groove 14 is provided through the outer wall of the inner cylinder 5 corresponding to the support shell 6, so that under the support restriction of the support rod 706 and the support groove 707, when the extrusion block 702 moves downward, the inclined surface of the extrusion block 702 can be used to guide the support shell 6 to move, and the four support shells 6 are pushed outward from the inner cylinder 5 to fit and extrude with the inner wall of the seamless pipe, so as to support the inner pipe wall of the seamless pipe and avoid the concave deformation of the clamping part of the seamless pipe due to excessive force during the stretching process;

[0041] By the above, when the clamping test is carried out on the seamless pipe, after the outer wall of the seamless pipe is clamped, the driving motor 11 can be used to drive the rotating rod 701 to rotate, and the four supporting shells 6 are pushed outward from the inner cylinder 5 to fit and squeeze the inner wall of the seamless pipe, so as to support the inner wall of the seamless pipe, avoid concave deformation of the clamping part of the seamless pipe due to excessive force during the stretching process, ensure the stability of the device during the tensile test, and help to improve the accuracy and reliability of the test results.

[0042] Embodiment 2: On the basis of the above embodiment, the inner wall of the support shell 6 is provided with a friction-increasing alarm mechanism 8. Furthermore, the friction-increasing alarm mechanism 8 includes a trigger block 801, and the outer wall of the trigger block 801 fits and slides with the inner wall of the support shell 6. A pressure sensor 803 is fixedly installed on the bottom inner wall of the support shell 6. A compression spring 802 is fixedly connected to the bottom of the trigger block 801 corresponding to the pressure sensor 803, and the trigger block 801 is made of rubber. A liquid storage cylinder 804 is fixedly connected to the inner wall of the inner cylinder 5 at an equal distance corresponding to the support shell 6, and a piston 805 is fitted and slidably connected to the inner wall of the liquid storage cylinder 804. A pull rope 806 is fixedly connected to the bottom center of the piston 805, and the other end of the pull rope 806 is fixedly connected to the top of the trigger block 801.

[0043] In this embodiment, the outer wall of the trigger block 801 is fitted and slid with the inner wall of the support shell 6, so that after the four support shells 6 are fitted and squeezed with the inner wall of the seamless pipe, one side of the trigger block 801 will be fitted and squeezed with the inner wall of the seamless pipe synchronously. When slippage occurs, the upper and lower lifting components 2 will slide toward the end position direction of the seamless pipe. At this time, a pressure sensor 803 is fixedly installed on the bottom inner wall of the support shell 6, and a compression spring 802 is fixedly connected to the corresponding pressure sensor 803 at the bottom of the trigger block 801, and the trigger block 801 is made of rubber, so that the trigger block 801 can be squeezed and fitted with the seamless pipe to make the trigger block 801 move relatively, and the compression spring 802 is used to squeeze the pressure sensor 803, so that the pressure value of the pressure sensor 803 increases, and a signal will be issued when the set value is reached to prevent the impact force or tension caused by sudden slippage from causing harm to the operator;

[0044] Then, the liquid storage cylinder 804 is fixedly connected to the supporting shell 6 at an equal distance through the inner wall of the inner cylinder 5, and the inner wall of the liquid storage cylinder 804 is slidably connected to the piston 805, and the bottom center of the piston 805 is fixedly connected to a pull rope 806, and the other end of the pull rope 806 is fixedly connected to the top of the trigger block 801, so that the liquid storage cylinder 804 moves away from the trigger block 801 during the slipping process, and the pull rope 806 can be used to pull the piston 805 to release the liquid in the liquid storage cylinder 804. The stored adhesive is squeezed, and at this time, a nozzle 807 is fixedly connected to one side wall of the liquid storage cylinder 804, and a through hole 15 is formed on the outer wall of the inner cylinder 5 corresponding to the nozzle 807, and the inner wall of the nozzle 807 is connected to the inside of the liquid storage cylinder 804, so that the adhesive in the liquid storage cylinder 804 can be sprayed on the subsequent sliding path of the support shell 6 through the nozzle 807, so as to further improve the friction performance between the support shell 6 and the seamless pipe, reduce the possibility of slippage, and ensure the smooth progress of the tensile test;

[0045] By the above, when the clamping test is carried out on the seamless pipe, after the four support shells 6 are pressed against the inner wall of the seamless pipe, when slippage occurs, the trigger block 801 can be squeezed by the inner wall of the seamless pipe, so that the trigger block 801 moves relatively, so as to pull the pull rope 806, and the adhesive in the liquid storage cylinder 804 is sprayed through the nozzle 807 onto the subsequent sliding path of the support shell 6, so as to further improve the friction performance between the support shell 6 and the seamless pipe, and after slipping a certain distance, the pressure sensor 803 can be used for sensing and alarming, so as to avoid the impact force or tension caused by the sudden slippage from causing harm to the operator, thereby ensuring the stability of the device during the tensile test.

[0046] Embodiment 3, on the basis of the above embodiment, the two side walls of the support shell 6 are provided with a reversal auxiliary mechanism 9, further, the reversal auxiliary mechanism 9 includes a slider 901, and a side wall of the two sliders 901 close to each other is fixedly connected to the two side walls of the trigger block 801, and the two side walls of the support shell 6 are provided with a slide groove 16 corresponding to the slider 901, and the outer wall of the slider 901 slides in contact with the inner wall of the slide groove 16, and the two side walls of the support shell 6 are rotatably connected with a shaft rod 902, and the outer wall of the shaft rod 902 is fixedly connected with a rubber wheel 903, and the other end of the shaft rod 902 is fixedly connected with a limiting disk 904 corresponding to the rubber wheel 903;

[0047] In this embodiment, during the slipping process, the side walls of the two sliders 901 that are close to each other are fixedly connected to the side walls of the trigger block 801, and the side walls of the support shell 6 are rotatably connected with the shaft rod 902, and the outer wall of the shaft rod 902 is fixedly connected with the rubber wheel 903, and the outer wall of the shaft rod 902 is fixedly connected with the transmission gear 905, and the one side wall of the slider 901 is fixedly connected with the connecting rod 906, and the other end of the connecting rod 906 is fixedly connected with the transmission gear 905. The gear rod 907 and the transmission gear 905 can cooperate to drive a number of rubber wheels 903 that are pressed against the inner wall of the seamless pipe to rotate during the slipping process of the support shell 6, and the rotation direction is opposite to the slipping direction, so as to reduce the slipping speed during the clamping process, so that the adhesive has more time to fully react, thereby ensuring the friction-increasing effect of the adhesive and prolonging the clamping time, which is conducive to the smooth success of the tensile test;

[0048] Then, when the tensile test is completed, the four extrusion blocks 702 are driven to rise and return to their positions by the reverse rotation of the driving motor 11, and the extrusion of the inner wall of the seamless pipe by the support shell 6 is released. Then, the clamping block 18 is driven to separate by the electric push rod 19, and then the upper and lower lifting components 2 are controlled to separate to take out the seamless pipe sample. Finally, the support shell 6 is manually pressed and retracted into the inner cylinder 5.

[0049] By the above, when the seamless pipe is clamped, when the trigger block 801 moves relatively, the gear rod 907 can be used to drive multiple rubber wheels 903 that are pressed against the inner wall of the seamless pipe to rotate, and the rotation direction is opposite to the slipping direction, so as to reduce the slipping speed during the clamping process, so that the adhesive has more time to fully react, thereby ensuring the friction-increasing effect of the adhesive and extending the clamping time, which is conducive to the smooth success of the tensile test, thereby ensuring the stability of the device during the tensile test.

[0050] A stainless steel seamless pipe stretching method is as follows:

[0051] First, use a caliper to mark the clamping position distance at both ends of the seamless pipe to match the clamping range of the clamping block 18, then vertically place the seamless pipe in the middle of the two lifting components 2, then control the two lifting components 2 to approach each other by a certain distance, so that the inner cylinder 5 extends into the inner walls of both ends of the seamless pipe, and then use the electric push rod 19 to drive the clamping blocks 18 at the upper and lower positions to initially clamp and support the seamless pipe;

[0052] Then, the driving motor 11 is used to drive the rotating rod 701 to rotate. Under the restriction of the limiting rod 705 on the extrusion block 702, the four extrusion blocks 702 can move downward synchronously through the cooperation of the ball 704 and the spiral groove 703. Under the support and restriction of the support rod 706 and the support groove 707, when the extrusion block 702 moves downward, the inclined surface of the extrusion block 702 can be used to guide the support shell 6 to move, and the four support shells 6 are pushed outward from the inner cylinder 5 to fit and extrude with the inner wall of the seamless pipe, so as to support the inner pipe wall of the seamless pipe;

[0053] Then, after the four support shells 6 are pressed against the inner wall of the seamless pipe, one side of the trigger block 801 is pressed against the inner wall of the seamless pipe. When slippage occurs, the upper and lower lifting components 2 are pressed against the end position of the seamless pipe. The trigger block 801 is pressed against the seamless pipe to move relative to the trigger block 801. The compression spring 802 is used to press the pressure sensor 803, so that the pressure value of the pressure sensor 803 increases. When the set value is reached, a signal is sent to alarm.

[0054] Then, during the slipping process, the liquid storage cylinder 804 moves away from the trigger block 801, and the pull rope 806 can be used to pull the piston 805 to squeeze the adhesive stored in the liquid storage cylinder 804, and the adhesive in the liquid storage cylinder 804 is sprayed on the subsequent sliding path of the support shell 6 through the nozzle 807, so as to further improve the friction performance between the support shell 6 and the seamless pipe, reduce the possibility of slipping, and ensure the smooth progress of the tensile test;

[0055] Then, during the slipping process of the support shell 6, the cooperation between the gear rod 907 and the transmission gear 905 can drive several rubber wheels 903 that are pressed against the inner wall of the seamless tube to rotate, and the rotation direction is opposite to the slipping direction, so as to reduce the slipping speed during the clamping process, so that the adhesive has more time to fully react, thereby ensuring the friction-increasing effect of the adhesive and extending the clamping time, which is conducive to the smooth success of the tensile test.

[0056] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A stainless steel seamless pipe stretching device, characterized in that: The test machine comprises a main body (1), a lifting component (2), and a sensor component (3); a connecting frame (4) is installed at one end of the two sensor components (3) that are close to each other, and an inner cylinder (5) is fixedly connected to the inner wall of the connecting frame (4); support shells (6) are arranged at equal distances inside the inner cylinder (5), and a telescopic groove (14) is penetrated and opened on the outer wall of the inner cylinder (5) corresponding to the support shell (6); A support mechanism (7) is provided inside the inner cylinder (5) to support the inner wall of the seamless pipe to prevent the clamping portion of the seamless pipe from being sunken and deformed; The inner wall of the support shell (6) is provided with a friction-increasing alarm mechanism (8) so as to spray adhesive on the subsequent sliding path when slipping occurs, and to generate a sensing alarm after slipping a certain distance; The two side walls of the support shell (6) are provided with a reversal auxiliary mechanism (9) to reduce the slipping speed during the clamping process when slipping occurs; The support mechanism (7) comprises a rotating rod (701), and the top of the rotating rod (701) is rotatably connected to the inner wall of the connecting frame (4), the outer wall of the rotating rod (701) is provided with an extrusion block (702) at an equal distance corresponding to the support shell (6), and the outer wall of the rotating rod (701) is provided with a spiral groove (703) at an equal distance, a side wall of the extrusion block (702) is fixedly connected with a ball (704) corresponding to the spiral groove (703), and the outer wall of the ball (704) is slidably fitted with the inner wall of the spiral groove (703), a limiting rod (705) is provided at the top of the extrusion block (702), and the bottom of the extrusion block (702) is in the shape of an inclined surface; A support rod (706) is fixedly connected to a side wall of the support shell (6) facing the rotating rod (701), and a support groove (707) is provided on the outer wall of the rotating rod (701) at an equal distance from the support rod (706), the outer wall of the support rod (706) slides in contact with the inner wall of the support groove (707), and the support rod (706) is a square rod, and a notch (708) is provided on a side wall of the extrusion block (702) corresponding to the friction-increasing alarm mechanism (8); The outer wall of the rotating rod (701) is fixedly connected to a driven gear (10), the top of the connecting frame (4) is fixedly mounted with a driving motor (11), and an output shaft at one end of the driving motor (11) is fixedly connected to a driving gear (12), and a through groove (13) is formed on the outer wall of the inner cylinder (5) corresponding to the driving gear (12), and one side of the driving gear (12) is meshed and matched with one side of the driven gear (10); The friction-increasing alarm mechanism (8) comprises a trigger block (801), and the outer wall of the trigger block (801) is fitted and slidably connected to the inner wall of the support shell (6); a pressure sensor (803) is fixedly installed on the inner wall of the bottom of the support shell (6); a compression spring (802) is fixedly connected to the bottom of the trigger block (801) corresponding to the pressure sensor (803); the trigger block (801) is made of rubber; a liquid storage cylinder (804) is fixedly connected to the inner wall of the inner cylinder (5) at an equal distance corresponding to the support shell (6); a piston (805) is fitted and slidably connected to the inner wall of the liquid storage cylinder (804); a pull rope (806) is fixedly connected to the center of the bottom of the piston (805); and the other end of the pull rope (806) is fixedly connected to the top of the trigger block (801); A nozzle (807) is fixedly connected to one side wall of the liquid storage cylinder (804); a through hole (15) is formed on the outer wall of the inner cylinder (5) corresponding to the nozzle (807); the inner wall of the nozzle (807) is connected to the interior of the liquid storage cylinder (804); the top of the limiting rod (705) is fixedly connected to the bottom of the liquid storage cylinder (804); and the outer wall of the limiting rod (705) is slidably fitted with the interior of the extrusion block (702); The reversal auxiliary mechanism (9) comprises a slider (901), and the adjacent side walls of the two sliders (901) are fixedly connected to the side walls of the trigger block (801), and the side walls of the support shell (6) are provided with a slide groove (16) corresponding to the slider (901), and the outer wall of the slider (901) slides in contact with the inner wall of the slide groove (16), and the side walls of the support shell (6) are rotatably connected to the shaft rod (902), and the outer wall of the shaft rod (902) is fixedly connected to the rubber wheel (903), and the other end of the shaft rod (902) is fixedly connected to the limiting disk (904) corresponding to the rubber wheel (903); The outer wall of the shaft rod (902) is fixedly connected to a transmission gear (905), a side wall of the slider (901) is fixedly connected to a connecting rod (906), and the other end of the connecting rod (906) is fixedly connected to a gear rod (907) corresponding to the transmission gear (905), a side wall of the gear rod (907) is meshed with the transmission gear (905), and a second notch (17) is formed through the inner wall of the telescopic slot (14) corresponding to the gear rod (907).

2. A stainless steel seamless pipe stretching device according to claim 1, characterized in that: Clamping blocks (18) are provided on both inner walls of the connecting frame (4), and electric push rods (19) are fixedly mounted on both outer walls of the connecting frame (4), with an output rod at one end of the electric push rod (19) passing through the interior of the connecting frame (4) and fixedly connected to one side wall of the clamping block (18).

3. The stretching method of a stainless steel seamless pipe stretching device according to claim 1, characterized in that: The following steps are involved: S1: Stable clamping, using a driving motor (11) to drive the rotating rod (701) to rotate, and under the restriction of the extrusion block (702) by the restriction rod (705), the four extrusion blocks (702) can move downward synchronously through the cooperation of the ball (704) and the spiral groove (703), so that the inclined surface of the extrusion block (702) guides the support shell (6) to move, and the four support shells (6) are pushed outward from the inner cylinder (5) to fit and extrude with the inner wall of the seamless pipe, so as to support the inner pipe wall of the seamless pipe; S2: alarm and friction increase. When slippage occurs, the trigger block (801) will move relatively to increase the pressure value of the pressure sensor (803). When the set value is reached, a signal will be issued to alarm. At the same time, during the slippage process, the trigger block (801) uses the pull rope (806) to spray the adhesive in the liquid storage cylinder (804) onto the subsequent sliding path of the support shell (6), thereby improving the friction performance between the support shell (6) and the seamless pipe, reducing the possibility of slippage, and ensuring the smooth progress of the tensile test; S3: reverse rolling. During the slipping process of the supporting shell (6), the gear rod (907) and the transmission gear (905) cooperate to drive a plurality of rubber wheels (903) that are pressed against the inner wall of the seamless tube to rotate, and the rotation direction is opposite to the slipping direction, so as to reduce the slipping speed during the clamping process, so that the adhesive has more time to fully react, thereby ensuring the friction-increasing effect of the adhesive and prolonging the clamping time, which is conducive to the smooth success of the tensile test.

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