Tensile loading tool for stress corrosion test

Abstract

The utility model relates to the technical field of test detection appliances, and provides a stress corrosion test tensile loading tool which comprises a base, and a loading assembly is arranged on the base; the loading assembly comprises a transmission shaft piece, and two groups of threads with the same thread pitch and opposite rotation directions are arranged on the transmission shaft piece; the two groups of threads are respectively in threaded connection with a clamping slide block; the transmission shaft piece further sleeves a torque limiter and is in transmission connection with a driving motor; the test bar clamping assembly comprises a clamping seat which is arranged above the clamping chute in a crossing manner; the clamping base is provided with two sliding rails perpendicular to the moving direction of the clamping sliding grooves. Two stretching blocks are arranged on the two sliding rails in a sliding manner; the two stretching blocks are symmetrically arranged on the two sides of a center shaft of the clamping sliding groove. Two outer supporting inclined surfaces are arranged on the stretching block; and two pressurizing blocks which are symmetrically distributed on the two sides of the central shaft of the through hole are also arranged between the two stretching blocks. Therefore, loading is carried out through cooperation of the threads and the sliding blocks, the loading process is convenient and fast to operate, the single-rod experiment period is shortened, and the detection efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of test and detection instruments, in particular to a stress corrosion test tensile loading tool. Background Art

[0002] Stress corrosion testing is a routine inspection item for 2XXX and 7XXX series aluminum alloy products. According to the standard test method for determining stress corrosion cracking susceptibility, the rod-shaped tensile specimens specified in ASTM G47 require stress to be applied to the specimen section before corrosion testing. Specialized equipment is required to perform tensile loading on the rod-shaped specimens.

[0003] For example, a tensile specimen stress corrosion test fixture disclosed in Chinese patent CN115266302A has many manual operation steps and requires the use of an extensometer for each loading. The test cycle for each specimen takes several minutes, which is a long test cycle.

[0004] As a routine inspection item, the tensile stress corrosion inspection of rod-shaped specimens has a large amount of work. The use of existing inspection tooling and inspection methods seriously affects the efficiency of specimen inspection.

[0005] In summary, the existing technology has obvious inconveniences and defects in actual use, so it is necessary to improve it. Utility Model Content

[0006] In view of the above-mentioned defects, the utility model mainly provides a stress corrosion test tensile loading tooling to solve the technical problems of the existing detection tooling that is cumbersome to operate and has a long experimental cycle.

[0007] In order to solve the above problems, the utility model provides a stress corrosion test tensile loading tool, comprising a base, on which a loading assembly is provided; the loading assembly includes a transmission shaft, on which two sets of threads with the same pitch and opposite rotation directions are provided; the two sets of threads are respectively threadedly connected to a clamping slider; the transmission shaft is also sleeved with a torque limiter and a transmission connection drive motor;

[0008] The base is provided with a clamping chute; the clamping slider is slidably arranged in the clamping chute; the cross-sectional shape of the clamping slider is adapted to the clamping chute;

[0009] It also includes a test rod clamping assembly; the rod clamping assembly includes a clamping seat arranged across the clamping slot; the clamping seat is provided with two slide rails perpendicular to the direction of the clamping slot; two stretching blocks are slidably arranged on the two slide rails; the two stretching blocks are symmetrically arranged on both sides of the central axis of the clamping slot;

[0010] A through hole is provided at the center of the two stretching blocks, and a clamp for fixing the test rod is passed through the through hole; the central axes of the two through holes coincide, and the two clamping sliders are symmetrically arranged on both sides of the central axis;

[0011] The stretching block is provided with two outer supporting inclined surfaces symmetrically arranged on both sides of the through hole; the cross-sectional shape of the outer supporting inclined surfaces is linearly inclined from the through hole to the side;

[0012] Two pressure blocks are symmetrically distributed on both sides of the central axis of the through hole between the two stretching blocks; the two ends of the pressure blocks respectively abut against the outer supporting inclined surface of the stretching block on the corresponding side.

[0013] According to the stress corrosion test tensile loading tooling of the utility model, the transmission shaft includes two butt-connected rotating shafts, each of which is provided with a set of threads; the threads on the two rotating shafts have the same pitch and opposite rotation directions; one of the rotating shafts is sleeved with a torque limiter and a transmission connection drive motor.

[0014] According to the stress corrosion test tensile loading tooling of the present invention, a positioning slide is provided on both sides of the clamping slide; a positioning slider that slides with the positioning slide is fixed to the bottom of the clamping seat; and the cross-sectional shape of the positioning slider is adapted to the positioning slide.

[0015] According to the stress corrosion test tensile loading fixture of the present invention, two positioning bolts symmetrically arranged on both sides of the clamping slot are fixed on the base, and the positioning bolts are threadedly sleeved with a top sleeve.

[0016] According to the stress corrosion test tensile loading tool of the utility model, the end of the head sleeve is a hemispherical structure.

[0017] According to the stress corrosion test tensile loading fixture of the present invention, the fixture includes a sleeve movably sleeved in the through hole; the sleeve is fixedly connected to the bolt head located outside the through hole.

[0018] According to the stress corrosion test tensile loading fixture of the utility model, the outer support inclined surface and the pressure block are in surface contact cooperation.

[0019] According to the stress corrosion test tensile loading fixture of the present invention, the outer support inclined surface is a cylindrical surface; and the fitting surface where the pressure block abuts against the outer support inclined surface is an arc surface.

[0020] According to the stress corrosion test tensile loading fixture of the present invention, the driving motor and the transmission shaft are respectively connected to a transmission gear, and the two transmission gears are meshed and connected.

[0021] According to the stress corrosion test tensile loading fixture of the present invention, a clamping plate for abutting against the pressure block is fixed on the clamping slider.

[0022] In summary, the utility model loads by cooperating with the thread and the slider. The torque value of the first maximum load is recorded by the torque limiter. In subsequent repeated tests, this torque value is set as the limit torque; when the subsequent test is loaded to the limit torque, a control signal is sent to stop and reverse the drive motor, and a test is completed. The stress value of each loading is highly repeatable, and the loading results are accurate and controllable. The loading process is easy to operate, which greatly shortens the experimental cycle of a single group of test rods and improves the detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural diagram of the utility model;

[0024] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle base;

[0025] Figure 3 It is a structural diagram of the loading assembly of the utility model;

[0026] Figure 4 This is a structural diagram of the test rod clamping assembly of the utility model;

[0027] Figure 5 yes Figure 4 Schematic diagram of the structure of the clamping seat;

[0028] Figure 6 yes Figure 4 Schematic diagram of the top view structure;

[0029] In the figure: 1-base, 11-positioning bolt, 12-top sleeve, 13-drive motor, 131-motor controller; 14-transmission gear, 15-torque limiter, 151-torque controller; 16-clamping slot, 17-positioning slot; 2-clamping slider, 21-plywood; 3-rotating shaft, 4-clamping seat, 41-slide rail, 42-positioning slider, 43-pressure block, 44-stretching block, 45-external support inclined plane, 46-bolt head, 47-sleeve; 100-test rod, 200-test rod clamping assembly. DETAILED DESCRIPTION

[0030] See also Figure 1 The present invention provides a stress corrosion test tensile loading tool, comprising a base 1, on which a loading assembly is provided; see Figure 3 The loading assembly includes a transmission shaft, which is provided with two sets of threads with the same pitch and opposite rotation directions; the two sets of threads are respectively screwed to a clamping slider 2; the transmission shaft is also sleeved with a torque limiter 15 and a transmission connection drive motor 13;

[0031] See also Figure 2A clamping groove 16 is provided on the base 1; the clamping slider 2 is slidably arranged in the clamping groove 16; the clamping slider 2 is adapted to the cross-sectional shape of the clamping groove 16; the clamping slider 2 is matched with the clamping groove 16; the torsional force generated on the clamping slider 2 when the transmission shaft rotates is offset by the cooperation between the clamping slider 2 and the clamping groove 16, so that the clamping slider 2 is translated along the axial direction of the transmission shaft.

[0032] More preferably, the cross-sectional shapes of the clamping slider 2 and the clamping slot 16 are both "X"-shaped, so that the contact area between the two is large, the force is uniform, and the movement stability of the clamping slider 2 is good.

[0033] When the transmission shaft of the present invention rotates, the two clamping slide blocks 2 can move toward or away from each other.

[0034] As an embodiment of a transmission shaft, the transmission shaft of the utility model includes two butt-connected rotating shafts 3, each of which is provided with a set of threads; the threads on the two rotating shafts 3 have the same pitch and opposite rotation directions; one of the rotating shafts 3 is sleeved with a torque limiter 15 and is transmission-connected to a drive motor 13;

[0035] The transmission shaft is formed by connecting two rotating shafts 3, which is convenient for processing, manufacturing, installation and debugging.

[0036] See also Figure 4 , further comprising a test rod clamping assembly 200; the rod clamping assembly 200 comprises a clamping seat 4 arranged across the clamping slot 16; the clamping seat 4 is provided with two slide rails 41 perpendicular to the direction of the clamping slot 16; two stretching blocks 44 are slidably provided on the two slide rails 41; the two stretching blocks 44 are symmetrically arranged on both sides of the central axis of the clamping slot 16;

[0037] Combine Figure 5 A through hole is provided at the center of the two stretching blocks 44, and a clamp for fixing the test rod 100 is passed through the through hole; the central axes of the two through holes coincide, and the two clamping sliders 2 are symmetrically arranged on both sides of the central axis;

[0038] Combine Figure 6 The stretching block 44 is provided with two outer supporting inclined surfaces 45 symmetrically arranged on both sides of the through hole; the cross-sectional shape of the outer supporting inclined surface 45 is: linearly inclined from the through hole to the side;

[0039] Two pressure blocks 43 are symmetrically distributed on both sides of the central axis of the through hole between the two stretching blocks 44 ; two ends of the pressure blocks 43 respectively abut against the outer supporting inclined surface 45 of the stretching block 44 on the corresponding side.

[0040] After the test rod 100 is clamped, the drive motor 13 is activated to rotate the transmission shaft, causing the two clamping slides 2 to move toward each other and simultaneously press on the pressure block 43, causing the two pressure blocks 43 to slide synchronously along the outer support slope 45, thereby generating tension between the two tension blocks 44, completing the loading of the test rod 100. After loading is completed, the drive motor 13 is reversed, and the two clamping slides 2 move away from each other, making it easier for the operator to replace the test rod 100 and proceed to the next set of tests.

[0041] During the first loading, the torque limiter 15 records the torque value at the maximum load. For subsequent repeated tests, this torque value is set as the limit torque. When the load reaches this limit torque during subsequent tests, a control signal is issued to stop and reverse the drive motor 13, completing the test. Operators only need to complete the clamping and removal of the test rod 100, significantly improving testing efficiency. Furthermore, the stress values ​​obtained during each loading are highly repeatable, ensuring accurate and controllable loading results.

[0042] During the first loading, an extensometer can be used on the 100mm section of the test bar to measure the loading stress and torque values. Subsequent repeated tests do not require the use of an extensometer, reducing the frequency of instrument use and improving operational efficiency.

[0043] More preferably, the torque limiter 15 of the present invention is connected to the torque controller 151 ; the drive motor 13 is connected to the motor controller 131 ; thus facilitating automatic control of the loading process.

[0044] As an embodiment, the drive motor 13 and the transmission shaft are respectively connected to a transmission gear 14, and the two transmission gears 14 are meshed and connected. Through gear transmission, the number of revolutions of the drive motor 13 can be accurately transmitted to the transmission shaft, facilitating accurate control of the loading load.

[0045] The utility model controls the rotation of the transmission shaft by driving the motor 13 and loads the load through the cooperation between the thread and the slider. The loading process is easy to operate, greatly shortens the experimental cycle of a single set of test bars 100, and improves the detection efficiency.

[0046] As an embodiment, a positioning slot 17 is provided on both sides of the clamping slot 16 of the utility model; a positioning slider 42 is fixed to the bottom of the clamping seat 4 and slides with the positioning slot 17; the positioning slider 42 is adapted to the cross-sectional shape of the positioning slot 17; better, the cross-sectional shapes of the positioning slider 42 and the positioning slot 17 are both trapezoidal.

[0047] The test rod clamping assembly 200 can move along the position adjustment slot 17 to accurately adjust its position so that the two clamping sliders 2 are symmetrically distributed on both sides of the test rod clamping assembly 200, and pressure is applied synchronously on both sides during loading.

[0048] Furthermore, two positioning bolts 11 symmetrically arranged on both sides of the clamping groove 16 are fixed on the base 1, and the positioning bolts 11 are threadedly sleeved with the top sleeve 12; during debugging, the top sleeve 12 is screwed to extend it and press against the fixture, so as to facilitate precise positioning of the position of the test rod clamping assembly 200 so that it is located at the center position of the two clamping sliders 2.

[0049] The end of the head sleeve 12 is preferably a hemispherical structure to reduce the contact area with the fixture and improve positioning accuracy.

[0050] See also Figure 5 As an embodiment, the clamp of the present invention includes a sleeve 47 movably sleeved in the through hole; the sleeve 47 is fixedly connected to the bolt head 46 located outside the through hole;

[0051] The test rod 100 of the present invention is a standard test rod, having a relatively large diameter clamping section at each end. The sleeve 47 can be threadedly connected to the clamping section, providing excellent stability and preventing relative slippage during the tensile process. Furthermore, the bolt head 46 is larger than the diameter of the through hole, allowing it to abut against the through hole opening and withstand the tensile force.

[0052] As an embodiment, the outer supporting inclined surface 45 and the pressure block 43 are in surface contact, which provides good stability during sliding pressure application.

[0053] Furthermore, the outer support inclined surface 45 is a cylindrical surface; the contact surface between the pressure block 43 and the outer support inclined surface 45 is an arc surface;

[0054] More preferably, a clamping plate 21 for abutting against the pressure block 43 is fixed on the clamping slider 2 .

[0055] In summary, the utility model provides a stress corrosion test tensile loading fixture, which is loaded through the cooperation of the thread and the slider. The torque value of the first maximum load is recorded using a torque limiter. In subsequent repeated tests, this torque value is set as the limit torque; when the subsequent test is loaded to the limit torque, a control signal is sent to stop and reverse the drive motor to complete a test. The stress value of each loading is highly repeatable, and the loading results are accurate and controllable. The loading process is easy to operate, which greatly shortens the experimental cycle of a single group of test rods and improves the detection efficiency.

[0056] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field can make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A stress corrosion test tensile loading tool, characterized in that: The invention comprises a base, on which a loading assembly is provided; the loading assembly comprises a transmission shaft, on which two sets of threads with the same pitch and opposite rotation directions are provided; the two sets of threads are respectively screwed to a clamping slider; the transmission shaft is also sleeved with a torque limiter and a transmission connection drive motor; The base is provided with a clamping chute; the clamping slider is slidably arranged in the clamping chute; the cross-sectional shape of the clamping slider is adapted to the clamping chute; It also includes a test rod clamping assembly; the rod clamping assembly includes a clamping seat arranged across the clamping slot; the clamping seat is provided with two slide rails perpendicular to the direction of the clamping slot; two stretching blocks are slidably arranged on the two slide rails; the two stretching blocks are symmetrically arranged on both sides of the central axis of the clamping slot; A through hole is provided at the center of the two stretching blocks, and a clamp for fixing the test rod is passed through the through hole; the central axes of the two through holes coincide, and the two clamping sliders are symmetrically arranged on both sides of the central axis; The stretching block is provided with two outer supporting inclined surfaces symmetrically arranged on both sides of the through hole; the cross-sectional shape of the outer supporting inclined surfaces is linearly inclined from the through hole to the side; Two pressure blocks are symmetrically distributed on both sides of the central axis of the through hole between the two stretching blocks; the two ends of the pressure blocks respectively abut against the outer supporting inclined surface of the stretching block on the corresponding side.

2. The stress corrosion test tensile loading fixture according to claim 1, characterized in that: The transmission shaft comprises two butt-connected rotating shafts, each of which is provided with a set of threads; the threads on the two rotating shafts have the same pitch and opposite rotation directions; one of the rotating shafts is sleeved with a torque limiter and a transmission connection drive motor.

3. The stress corrosion test tensile loading fixture according to claim 1, characterized in that: A positioning slide is provided on both sides of the clamping slide respectively; a positioning slider which is slidably matched with the positioning slide is fixed on the bottom of the clamping seat; and the cross-sectional shape of the positioning slider is adapted to the positioning slide.

4. The stress corrosion test tensile loading fixture according to claim 3, characterized in that: Two positioning bolts symmetrically arranged on both sides of the clamping slot are fixed on the base, and the positioning bolts are threadedly sleeved with the top head sleeve.

5. The stress corrosion test tensile loading fixture according to claim 4, characterized in that: The end of the head cover is a hemispherical structure.

6. The stress corrosion test tensile loading fixture according to claim 1, characterized in that: The clamp comprises a sleeve movably sleeved in the through hole; the sleeve is fixedly connected to a bolt head located outside the through hole.

7. The stress corrosion test tensile loading fixture according to claim 1, characterized in that: The outer supporting inclined surface is in surface contact with the pressure block.

8. The stress corrosion test tensile loading fixture according to claim 7, characterized in that: The outer supporting inclined surface is a cylindrical surface; and the fitting surface where the pressure block abuts against the outer supporting inclined surface is an arc surface.

9. The stress corrosion test tensile loading fixture according to any one of claims 1 to 8, characterized in that: The driving motor and the transmission shaft are respectively connected to a transmission gear, and the two transmission gears are meshed and connected.

10. The stress corrosion test tensile loading fixture according to claim 9, characterized in that: A clamping plate for abutting against the pressure block is fixed on the clamping slide block.

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