CN-121977933-A - Automatic centering device for horizontal axial compression of steel pipe

CN121977933ACN 121977933 ACN121977933 ACN 121977933ACN-121977933-A

Abstract

The invention discloses an automatic centering device for horizontal axial compression of a steel pipe, and relates to the technical field of mechanical property testing of materials. The invention realizes full-automatic accurate centering in three-dimensional space through triple guarantees of laser centering, synchronous clamping and V-shaped brackets, thoroughly eliminates manual errors, has extremely high centering precision and repeatability, adopts a synchronous lifting scheme at two ends, avoids the risk of test piece warpage during single-point lifting, ensures stable and safe operation process, and forms a stable mechanical model from a fixed end to a loading end by rigidly connecting one end of the test piece with a reaction frame after centering is completed, and the butt joint precision with a main loading jack is maintained in the whole test process.

Inventors

ZHU PENGGANG
YAN RENZHANG
WANG SHUAI
FENG LONG
Zhan Zhenxiu
CHEN QIANG
ZHANG JUN
ZHAO BINGZHEN
Long Pingbing

Assignees

中铁二十局集团第三工程有限公司
重庆交通大学
重庆航天职业技术学院
陕西建工集团股份有限公司

Dates

Publication Date: 20260505
Application Date: 20260225

Claims (10)

1. The automatic centering device for the horizontal axial pressure of the steel pipe comprises a steel pipe test piece (200) and a main loading jack (400) and is characterized by further comprising a reaction frame system, an automatic laser centering system, a synchronous clamping system, a synchronous jacking system, a concentric V-shaped bracket system and a total control system (600); The reaction frame system is used for supporting and fixing the automatic laser centering system, the synchronous clamping system and the synchronous jacking system; The automatic laser centering system is used for detecting the centering of the steel pipe test piece (200) in the vertical direction, namely the centering in the Y direction; The synchronous jacking system is used for synchronously jacking two ends of the steel pipe test piece (200) to realize adjustment on the vertical position of the steel pipe test piece (200), namely Y-direction adjustment; The synchronous clamping system is used for synchronizing the steel pipe test piece (200) from the horizontal direction, so as to realize the horizontal centering of the steel pipe test piece (200), namely the X-direction centering; The concentric V-shaped bracket system is used for providing horizontal references for the steel pipe test piece (200) and the main loading jack (400), namely X-direction references; And one side of the reaction frame system is provided with a total control system (600), and the automatic laser centering system, the synchronous clamping system and the synchronous jacking system are electrically connected with the total control system (600), so that the total control system (600) can be controlled in a coordinated manner.
2. The steel pipe horizontal axial pressure automatic centering device according to claim 1, wherein the reaction frame system comprises a left reaction frame (101) and a right reaction frame (102), the left reaction frame (101) and the right reaction frame (102) are arranged oppositely and in parallel, a fixed end plate (103) is welded at one end of a steel pipe test piece (200) in advance, one end of the fixed end plate (103) far away from the steel pipe test piece (200) is rigidly connected with the right reaction frame (102) through a high-strength bolt, and the inner side wall of the left reaction frame (101) is rigidly attached and fixed with a cushion block (104) through a high-strength bolt; The reaction frame system further comprises an I-shaped frame (105), the left reaction frame (101) and the right reaction frame (102) are spliced through the I-shaped frame (105), the bottom of the I-shaped frame (105) can be fixedly connected with foundation bolts, a guide rail (106) and a cushion block (104) are fixedly arranged at the top of the I-shaped frame (105), the guide rail (106) is located at one end of the cushion block (104), the guide rail (106) is parallel to the length direction of the I-shaped frame (105) and used for guiding the synchronous jacking system to slide along the horizontal direction with the synchronous clamping system, and the I-shaped frames (105) with different length specifications and the matched guide rail (106) are spliced to adapt to steel pipe test pieces (200) with different lengths.
3. The automatic centering device for the horizontal axial pressure of the steel pipe according to claim 2, wherein the synchronous clamping system comprises a motor (301), a first T-shaped steering gear (302), a spliced transmission shaft (303), a second T-shaped steering gear (304), a threaded rod (305), a guiding polished rod (306), a carrying frame (307), a displacement push plate (308), a clamping bracket (309) and a configuration frame (310); The top end of the guide rail (106) is slidably connected with two groups of carrying frames (307), and the inner side of each group of carrying frames (307) is provided with a distributing frame (310), a threaded rod (305) and a guide polish rod (306); The inner side of the configuration frame (310) is provided with a second T-shaped steering gear (304), two sides of the second T-shaped steering gear (304) are connected with threaded rods (305), the rotation directions of the threaded rods (305) on two sides are opposite, one side, far away from the second T-shaped steering gear (304), of the threaded rods (305) is rotationally connected with the carrying frame (307), and the guide polished rod (306) is positioned on two sides of the threaded rods (305) and the second T-shaped steering gear (304); One side of the I-shaped frame (105) is provided with a placing table, the top end of the placing table is fixedly connected with a motor (301), the top end of the I-shaped frame (105) is fixedly connected with a first T-shaped steering gear (302), the output end of the motor (301) is connected with the first T-shaped steering gear (302), two ends of the first T-shaped steering gear (302) are provided with a spliced transmission shaft (303), the length of the spliced transmission shaft (303) is selected according to the length of a steel pipe test piece (200), and one end, far away from the first T-shaped steering gear (302), of the spliced transmission shaft (303) is connected with a second T-shaped steering gear (304); the outside sliding connection of guide polished rod (306) has displacement push pedal (308), through threaded connection between displacement push pedal (308) and threaded rod (305), one side fixedly connected with at displacement push pedal (308) top presss from both sides tight support (309).
4. The automatic centering device for the horizontal axial compression of the steel pipe according to claim 3, wherein the synchronous jacking system comprises a left electric jack (801) and a right electric jack (802), and the left electric jack (801) and the right electric jack (802) are respectively fixed at the top ends of the two configuration frames (310); the left electric jack (801) and the right electric jack (802) are controlled by the total control system (600) to synchronously lift.
5. The automatic centering device for horizontal axial compression of steel pipes according to claim 4, wherein the concentric V-shaped bracket system comprises a first V-shaped bracket (501), a second V-shaped bracket (502) and a third V-shaped bracket (503); The top end of the cushion block (104) is fixedly connected with a first V-shaped bracket (501), the top end of the left electric jack (801) is fixedly connected with a second V-shaped bracket (502), and the top end of the right electric jack (802) is fixedly connected with a third V-shaped bracket (503); the second V-shaped bracket (502) and the third V-shaped bracket (503) are used for matching with the clamping bracket (309) to finish horizontal centering of the X direction of the steel pipe test piece (200).
6. The automatic centering device for horizontal axial compression of steel pipes according to claim 5, wherein the V-shaped groove center lines of the first V-shaped bracket (501), the second V-shaped bracket (502) and the third V-shaped bracket (503) are collinear to form a horizontal reference axis.
7. The automatic centering device for the horizontal axial pressure of the steel pipe according to claim 5, wherein the main loading jack (400) is located on the inner side of the first V-shaped bracket (501), and the loading end of the main loading jack (400) faces the left end of the steel pipe test piece (200) and is used for applying axial pressure to the centered steel pipe test piece (200).
8. The automatic centering device for the horizontal axial compression of the steel pipe according to claim 5, wherein the automatic laser centering system comprises a jack positioning ring (701), a laser transmitter (702), a first test piece positioning ring (703), a second test piece positioning ring (704), a laser receiver (705) and an electronic horizontal state detection module (706); The outer side of the main loading jack (400) is fixedly connected with a jack positioning ring (701) in a matching way, two sides of the jack positioning ring (701) are fixedly connected with laser transmitters (702), the laser transmitters (702) are used for transmitting horizontal laser beams, and the axial heights of the jack positioning ring (701) and the laser transmitters (702) are in the same horizontal line with the axial height of the main loading jack (400); A first test piece positioning ring (703) and a second test piece positioning ring (704) are assembled on the outer side of the steel pipe test piece (200), laser receivers (705) are fixedly connected to the two sides of the first test piece positioning ring (703) and the two sides of the second test piece positioning ring (704), and the laser receivers (705) are positioned at corresponding positions of the first test piece positioning ring (703) and the second test piece positioning ring (704) in the horizontal diameter direction; the laser transmitter (702) and the laser receiver (705) are both provided with an electronic level state detection module (706), the electronic level state detection module (706) comprises a double-shaft inclination angle sensor and an audible-visual alarm, and the electronic level state detection module (706) is used for detecting the level state of the jack positioning ring (701), the first test piece positioning ring (703) and the second test piece positioning ring (704) during installation and giving an alarm when the inclination exceeds the tolerance.
9. The automatic centering device for horizontal axial compression of steel pipes according to claim 8, wherein the first test piece positioning ring (703) and the second test piece positioning ring (704) are two symmetrical semicircular rings, and radial installation lug plates are arranged at the centers above and below the two semicircular rings and can be fixed through bolts after being closed.
10. The automatic centering device for horizontal axial pressure of steel pipe according to claim 1, wherein said total control system (600) comprises at least a PLC control system; the PLC control system is configured to perform the following closed loop control: the vertical centering control is that the left electric jack (801) and the right electric jack (802) are synchronously controlled to finish the synchronous lifting of the left electric jack (801) and the right electric jack (802), and a trigger signal of the laser receiver (705) is received, so that the trigger signal controls the left electric jack (801) and the right electric jack (802) to synchronously stop; And the horizontal centering judgment and control is that when the synchronous clamping system is controlled, the load feedback signal of the motor (301) driven by the synchronous clamping system is monitored in real time, and when the characteristics of the load feedback signal indicate that the steel pipe test piece (200) is horizontally centered and clamped, the driving motor (301) is controlled to stop.

Description

Automatic centering device for horizontal axial compression of steel pipe Technical Field The invention relates to the technical field of material mechanical property testing, in particular to an automatic centering device for horizontal axial compression of a steel pipe. Background In the fields of construction, bridges, oil and gas pipelines and the like, axial pressure tests are often required to be carried out on components such as steel pipes and the like to evaluate the mechanical properties of the components. Such tests are usually carried out in horizontally placed devices, with the test piece being supported at both ends by a reaction frame, with an axial pressure applied in the middle by means of a jack. In the prior art, the centering of the jack axis and the test piece axis is a great technical problem. The centering eccentricity can cause the test piece to bear additional bending moment, and the accuracy of test data and the actual bearing capacity of the test piece are seriously affected. At present, the traditional methods of manual hoisting, cushion block adjustment, visual observation and the like are mostly adopted, and the method has the following remarkable defects: 1. the efficiency is low, the centering process is tedious and time-consuming, and the test efficiency is severely restricted. 2. Poor accuracy, namely the centering accuracy is completely dependent on the experience and eye force of operators, the repeatability is poor, and the consistency of the conditions of each test is difficult to ensure. 3. The safety is insufficient, and for a test piece with larger slenderness, the single-point jacking adjustment is easy to warp and roll, so that potential safety hazards exist. Therefore, there is a strong need in the art for an efficient and safe device that automatically and accurately centers the jack and test piece in the vertical and horizontal directions and is suitable for large tonnage pressure tests. There is therefore a need to propose a new solution to the above problems. Disclosure of Invention The invention aims to provide an automatic centering device for horizontal axial compression of a steel pipe, which aims to solve the technical problems in the background technology. The invention provides a technical scheme that the steel pipe horizontal axial pressure automatic centering device comprises a steel pipe test piece, a main loading jack, a reaction frame system, an automatic laser centering system, a synchronous clamping system, a synchronous jacking system, a concentric V-shaped bracket system and a total control system; The reaction frame system is used for supporting and fixing the automatic laser centering system, the synchronous clamping system and the synchronous jacking system; The automatic laser centering system is used for detecting the centering of the steel pipe test piece in the vertical direction, namely the Y-direction centering; The synchronous jacking system is used for synchronously jacking two ends of the steel pipe test piece to realize the adjustment of the vertical position of the steel pipe test piece, namely Y-direction adjustment; The synchronous clamping system is used for synchronizing the steel pipe test piece from the horizontal direction, so as to realize the horizontal centering of the steel pipe test piece, namely the X-direction centering; The concentric V-shaped bracket system is used for providing a horizontal reference for the steel pipe test piece and the main loading jack, namely an X-direction reference; And one side of the reaction frame system is provided with a total control system, and the automatic laser centering system, the synchronous clamping system and the synchronous jacking system are electrically connected with the total control system, so that the total control system is convenient for coordinated control. Further, the reaction frame system comprises a left reaction frame and a right reaction frame which are arranged oppositely and in parallel, a fixed end plate is welded at one end of the steel pipe test piece in advance, one end of the fixed end plate, which is far away from the steel pipe test piece, is rigidly connected with the right reaction frame through a high-strength bolt, and the inner side wall of the left reaction frame is rigidly attached and fixed with the cushion block through a high-strength bolt; The counter-force frame system further comprises an I-shaped frame, the left counter-force frame and the right counter-force frame are spliced through the I-shaped frame, the bottom of the I-shaped frame can be fixedly connected with foundation bolts, a guide rail and a cushion block are fixedly arranged at the top of the I-shaped frame, the guide rail is located at one end of the cushion block and parallel to the length direction of the I-shaped frame and used for guiding the synchronous jacking system and the synchronous clamping system to slide along the horizontal direction, and the I-shaped frames wit