A high and low temperature static tensile load test chamber

Abstract

The present invention relates to the field of static tensile testing technology, specifically to a high and low temperature static tensile load testing test box, including a testing machine base; a crossbeam; a box body; an auxiliary uniform heating test device is arranged inside the box body, a test plate is arranged inside the auxiliary uniform heating test device, and a monitoring device is arranged on the crossbeam. The present invention realizes uniform heating of the test plate, heat leakage prevention and temperature reduction and isolation of the untested area through the auxiliary uniform heating test device, and by starting the anti-leakage feeding device, the test plate is clamped by the sealing card seat under normal conditions, and the effect of heat leakage prevention and heat blocking is achieved during clamping. Before realizing the automatic upward feeding of the test plate, the restriction of the two sealing card seats on the test plate is detached, and then the feeding work is facilitated, and the two sides of the test plate are blown to cool down, thereby avoiding the problem that the untested test plate at the bottom is damaged by high temperature due to heat transfer.

Description

Technical Field

[0001] The invention relates to the technical field of static tensile testing, in particular to a high and low temperature static tensile load testing chamber. Background Art

[0002] Carbon fiber reinforced polymer (CFRP) has excellent properties such as high specific strength, high specific stiffness and corrosion resistance, and has been widely used in aviation, automobile and other engineering fields. Composite laminates usually need to be connected as a whole by mechanical connection, adhesive or hybrid connection. Among them, mechanical connection is easier to maintain than adhesive joints and is convenient for connecting different materials, so mechanical connection still occupies a dominant position. Bolted joints are a mechanical connection method with sufficient connection strength and strong load transfer capacity. They have been widely used in joint connections in the aviation field. However, joints are usually the weakest part of the structure and are prone to damage and failure during use. Joints often determine the overall strength and life of the entire structure and are the most concerned part in structural design research. Joints often face various complex environments during use, and temperature is one of the main factors affecting the strength and durability of joints. At different temperatures, due to differences in thermal expansion coefficients, different materials will have different deformations, which will affect the damage initiation and evolution of the joint. This in turn affects the strength and service life of the joint. High temperature will accelerate the failure of the joint, and its damage initiation and evolution process are still not very clear. Therefore, it is necessary to study the damage initiation and evolution process of joints at different use temperatures.

[0003] In the existing test chamber for joint damage test at different temperatures, joints of different numbers and materials need to be tested sequentially during normal use, and the work of placing and removing needs to be carried out continuously during the test. In order to reduce the number of times of placing and removing, the joints to be tested can be welded sequentially before the experiment, and then the joints at different positions are tested by feeding. Multiple joints are assembled into a test plate. The longer test plate will penetrate the interior of the test chamber for static tensile test under the temperature environment. However, during the test, the hot air inside the test chamber leaks at the penetration point between the test plate and the box body, which will cause partial waste of heat and cold, affecting the accuracy of the temperature in the chamber. Combined with the different heating of the test plate in the area close to the heating component and the area far from the heating component, the problem of affecting the uniformity of the heating of the test plate is reached. At the same time, due to the limitation of the material of the joint itself, its overall surface has the effect of heat transfer. The heated test plate area in the chamber will transfer heat energy to the unmonitored area, thereby affecting the accuracy of static detection of the unmonitored area in subsequent feeding. In view of this, we propose a high and low temperature static tensile load test chamber. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a high and low temperature static tensile load test chamber, which solves the problems raised in the above background technology. To achieve the above purpose, the present invention is implemented through the following technical scheme: a high and low temperature static tensile load test chamber, including a test machine base, a crossbeam connected to the test machine base, a box connected to the crossbeam, a visible glass window connected to the box, an auxiliary uniform heating test device is arranged inside the box, a test board is arranged inside the auxiliary uniform heating test device, the auxiliary uniform heating test device realizes the work of uniform heating of the test board, preventing heat leakage and cooling and isolating the undetected area, and a monitoring device is arranged on the crossbeam.

[0005] Preferably, a test machine chuck is connected to the test machine base, and the interior of the test machine chuck is connected to the surface of the test plate.

[0006] Preferably, the auxiliary uniform heating test device includes an isolated motor box, an anti-leakage feeding device and a cooling device. The end of the isolated motor box is connected to the interior of the box body. The interior of the isolated motor box is connected to a driving gear through the output shaft of the motor. The surface of the driving gear is meshed with a toothed disc base, and the inner wall of the toothed disc base is fixedly connected to a heating plate.

[0007] Preferably, the end of the driving gear is rotatably connected to the inside of the isolation motor box, the surface of the gear disc base is rotatably connected to a support seat, and the surface of the support seat is fixedly connected to the inside of the box.

[0008] Preferably, the anti-leakage feeding device includes a temperature-insulating motor box, the end of which is connected to the interior of the box, the interior of the temperature-insulating motor box is connected to a half gear through the output shaft of the motor, a cam is fixedly connected to the half gear, a connecting rod is connected to the cam, the end of the connecting rod is fixedly connected to a sealing seat, and a driving shaft is slidably connected to the sealing seat.

[0009] Preferably, the surface of the connecting strip is slidably connected to a connecting seat, the end of the connecting seat is fixedly connected to the inside of the box, the end of the driving shaft is elastically connected to the inside of the connecting seat through a torsion spring, the surface of the sealing seat is slidably connected to the inside of the box, and the surface of the sealing seat is connected to the surface of the test board.

[0010] Preferably, the anti-leakage feeding device further comprises a feeding gear, the end of the feeding gear is fixedly connected to a feeding clamping rod, the end of the feeding clamping rod is rotatably connected in a connecting seat, and a rubber roller is fixedly connected to the feeding clamping rod.

[0011] Preferably, the cooling device comprises a cooling box, which is installed at the bottom of the box body, and a fan and a semiconductor refrigerator are respectively installed inside the cooling box, and an air guide base is fixedly connected to the end of the cooling box.

[0012] Preferably, the monitoring device includes a rotating arm, the end of which is rotatably connected to the inside of the crossbeam, the inside of the rotating arm is connected to a telescopic rod, the end of the telescopic rod is fixedly connected to a monitoring base, and the monitoring base is connected to a light source lamp and a camera.

[0013] Preferably, a clamping block is fixedly connected inside the rotating arm, and the rotating arm is clamped and fixed to the telescopic rod through the clamping block.

[0014] It can be seen from the above technical solutions that the high and low temperature static tensile load test chamber provided in the embodiments of this specification has at least the following beneficial effects:

[0015] (1) The present invention realizes uniform heating of the test plate, prevention of heat leakage and temperature reduction and isolation of the untested area by assisting the uniform heating test device. By starting the anti-leakage feeding device, the test plate is clamped by the sealing holder under normal conditions to achieve the effect of preventing heat leakage and heat blocking during clamping. Before realizing the automatic upward feeding of the test plate, the restriction of the two sealing holders on the test plate is released, thereby facilitating the feeding work.

[0016] (2) The present invention uses a cooling device. During the box test, the fan and the semiconductor refrigerator are started. The semiconductor refrigerator cools the gas in the cooling box, and the fan blows cold air from the air guide base to both sides of the test board for cooling, thereby avoiding the problem of the untested test board at the bottom being damaged by high temperature due to heat transfer.

[0017] (3) The present invention can achieve the effect of rotating and adjusting the monitoring base as a whole by setting a rotating arm. By lifting the monitoring base, the telescopic rod is disconnected from the clamping block and the position of the telescopic rod can be directly adjusted in the rotating arm, thereby achieving the effect of adjusting the distance of the monitoring base. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the internal structure of the box in the present invention;

[0021] Figure 3 It is a schematic diagram of the structure of the auxiliary uniform heating test device in the present invention;

[0022] Figure 4 It is a schematic diagram of the structure of the anti-leakage feeding device in the present invention;

[0023] Figure 5 It is a schematic diagram of the structure of the cooling device in the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the monitoring device in the present invention;

[0025] Figure 7 It is a schematic diagram of the sealing seat structure in the present invention.

[0026] In the figure: 1. Test machine base; 2. Crossbeam; 3. Box; 4. Visual glass window; 5. Auxiliary uniform heating test device; 51. Isolation motor box; 52. Driving gear; 53. Toothed disc base; 54. Heating plate; 55. Anti-leakage feeding device; 551. Insulation motor box; 552. Half gear; 553. Cam; 554. Connecting bar; 555. Sealing card seat; 556. Toggle shaft; 557. Connecting seat; 558. Feed gear; 559. Feed clamp; 56. Cooling device; 561. Cooling box; 562. Fan; 563. Semiconductor refrigerator; 564. Air guide base; 57. Support seat; 6. Monitoring device; 61. Rotating arm; 62. Telescopic rod; 63. Monitoring base; 64. Light source lamp; 65. Camera; 7. Test board; 8. Test machine chuck. DETAILED DESCRIPTION

[0027] 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.

[0028] See also Figure 1-Figure 7 As shown, the technical solution provided by the present invention is:

[0029] A high and low temperature static tensile load test chamber includes a test machine base 1, a crossbeam 2 is connected to the test machine base 1, a box 3 is connected to the crossbeam 2, a visual glass window 4 is connected to the box 3, an auxiliary uniform heating test device 5 is arranged inside the box 3, a test board 7 is arranged inside the auxiliary uniform heating test device 5, the auxiliary uniform heating test device 5 realizes uniform heating of the test board 7, heat leakage prevention and temperature reduction and isolation of the undetected area, and a monitoring device 6 is arranged on the crossbeam 2. A test machine chuck 8 is connected to the test machine base 1, and the interior of the test machine chuck 8 is connected to the surface of the test board 7.

[0030] In this embodiment, the auxiliary uniform heating test device 5 includes an isolation motor box 51, an anti-leakage feeding device 55 and a cooling device 56. The end of the isolation motor box 51 is connected to the interior of the box body 3. The interior of the isolation motor box 51 is connected to a driving gear 52 through the output shaft of the motor. The surface of the driving gear 52 is meshed with a toothed disc base 53, and the inner wall of the toothed disc base 53 is fixedly connected to a heating plate 54. The end of the driving gear 52 is rotatably connected to the inside of the isolation motor box 51, and the surface of the toothed disc base 53 is rotatably connected to the support seat 57. The surface of the support seat 57 is fixedly connected to the inside of the box body 3. When the box body 3 is in testing operation, the heating plate 54 is turned on and the internal environment of the box body 3 is heated accordingly. During the heating period, the motor in the isolation motor box 51 is started, and the motor output shaft drives the driving gear 52 to rotate and engage the toothed disc base 53. When the toothed disc base 53 rotates, it drives the heating plate 54 to rotate and heat the front and back surfaces of the test plate 7. The rotational heating realizes uniform heating of both sides of the test plate 7, thereby improving the uniformity of double-sided heating of the test plate 7 and ensuring the accuracy of the test results of the plate surface at different temperatures.

[0031] Furthermore, the anti-leakage feeding device 55 includes a temperature-insulating motor box 551, the end of which is connected to the interior of the box body 3, and the interior of the temperature-insulating motor box 551 is connected to a half gear 552 through the output shaft of the motor, and a cam 553 is fixedly connected to the half gear 552, and a connecting rod 554 is connected to the cam 553, and a sealing holder 555 is fixedly connected to the end of the connecting rod 554. Two sealing holders 555 are provided at the bottom and top of the box body 3, respectively located on the front and rear sides of the test board 7, and a toggle shaft 556 is slidably connected to the sealing holder 555. By starting the anti-leakage feeding device 55, the sealing holder 555 is used to clamp the test board 7 under normal circumstances, and the effect of preventing heat leakage and heat blocking is achieved during clamping. Before realizing the automatic upward feeding of the test board 7, the restriction of the two sealing holders 555 on the test board 7 is disengaged, thereby facilitating the feeding work.

[0032] Furthermore, the surface of the connecting rod 554 is slidably connected to a connecting seat 557 for limiting the sliding trajectory of the connecting rod 554. The end of the connecting seat 557 is fixedly connected to the interior of the box body 3. The end of the driving shaft 556 is elastically connected to the interior of the connecting seat 557 through a torsion spring. The torsion spring is designed to elastically position the driving shaft 556, and then the driving shaft 556 is used to achieve limit control of the two sealing seats 555. The surface of the sealing seat 555 is slidably connected to the interior of the box body 3, and the surface of the sealing seat 555 is connected to the surface of the test board 7.

[0033] It is worth noting that the anti-leakage feeding device 55 also includes a feeding gear 558, the end of which is fixedly connected to a feeding clamp 559, the end of which is rotatably connected to the connecting seat 557, and a rubber roller is fixedly connected to the feeding clamp 559. When the feeding gear 558 rotates, the feeding clamp 559 thereon automatically feeds the test plate 7 upward, thereby achieving the effect of automatically feeding the undetected area of ​​the test plate 7.

[0034] It is worth noting that the cooling device 56 includes a cooling box 561, which is installed at the bottom of the box body 3. A fan 562 and a semiconductor refrigerator 563 are installed inside the cooling box 561 respectively. The end of the cooling box 561 is fixedly connected to an air guide base 564, which is frame-shaped and sleeved on the outside of the test board 7. A plurality of through slots are opened on the front and rear sides of the test board 7 to evenly disperse the cold air, so as to achieve the effect of cooling both the front and rear sides of the test board 7. During the test of the box body 3, the fan 562 and the semiconductor refrigerator 563 are started, the semiconductor refrigerator 563 cools the gas in the cooling box 561, and the fan 562 blows the cold air from the air guide base 564 to both sides of the test board 7 for cooling, thereby avoiding the problem that the test board 7 at the bottom that is not tested is damaged by high temperature due to heat transfer.

[0035] In addition, the monitoring device 6 includes a rotating arm 61, the end of which is rotatably connected to the inside of the crossbeam 2, the inside of the rotating arm 61 is connected to a telescopic rod 62, the end of the telescopic rod 62 is fixedly connected to a monitoring base 63, and the monitoring base 63 is connected to a light source lamp 64 and a camera 65. During the heating test, the light source lamp 64 is aimed at the inside of the box 3 for irradiation, and the camera 65 records the test results. The internal structure and damage morphology of the composite material are observed using high-resolution X-ray micro-computed tomography, and the cross-sectional image of the sample is reconstructed by technology for non-destructive analysis, thereby achieving the effect of observing the damage evolution process inside the composite material sample. A clamping block is fixedly connected to the inside of the rotating arm 61, and the rotating arm 61 is clamped and fixed to the telescopic rod 62 through the clamping block. The setting of the rotating arm 61 can achieve the effect of rotating and adjusting the monitoring base 63 as a whole. By lifting the monitoring base 63, the telescopic rod 62 can be directly adjusted in the rotating arm 61 after being disconnected from the clamping block, thereby achieving the effect of adjusting the distance of the monitoring base 63.

[0036] When the high and low temperature static tensile load test chamber of the present invention is used, in order to realize the tensile performance test of the four-nail bolt joint at different temperatures, an environmental chamber suitable for the size of the four-nail joint is designed, that is, the box body 3. The maximum temperature of the box body 3 can reach 300°C and the temperature can be maintained within ±1°C. The environmental chamber is installed between the two beams 2 of MTS (370.10). The static tensile test involves a total of 11 specimens, and 5, 1, 4 and 1 specimens are tested at room temperature, 60°C, 100°C and 150°C respectively. When the box 3 is in the test working state, the heating plate 54 is turned on and the internal environment of the box 3 is heated accordingly. During the heating period, the motor in the isolation motor box 51 is started, and the motor output shaft drives the driving gear 52 to rotate and engage the gear disc base 53 to rotate. When the gear disc base 53 rotates, it drives the heating plate 54 to rotate and heat the front and back sides of the test plate 7. The rotational heating realizes uniform heating of both sides of the test plate 7, thereby improving the uniformity of double-sided heating of the test plate 7, and ensuring the accuracy of the test results of the plate surface at different temperatures. During the heating test of the area of ​​the test plate 7 located in the box 3, the sealing cards on both sides of the test plate 7 arranged at the top and bottom of the box 3 are The seat 555 clamps and isolates the surface of the test board 7, and prevents the heat energy from flowing out through the groove where the test board 7 slides inside the box 3. At the same time, it has a certain heat isolation effect, preventing the temperature from being transferred to the untested test board 7 area at the bottom, thereby preventing the surface from being affected by high temperature in advance, resulting in large errors in subsequent tests. At the same time, the fan 562 and the semiconductor refrigerator 563 are started at this time, and the semiconductor refrigerator 563 cools the gas in the cooling box 561, and the fan 562 blows the cold air from the air guide base 564 to the two sides of the test board 7 to cool it down, thereby preventing the untested test board 7 at the bottom from being damaged by high temperature due to heat transfer. During the heating test, the light source lamp 64 is directed to the inside of the box 3 for irradiation, and the camera 65 records the test results. High-resolution X-ray micro-computed tomography is used to observe the internal structure and damage morphology of the composite material, and the cross-sectional image of the sample is reconstructed by technology for non-destructive analysis, thereby achieving the effect of observing the damage evolution process inside the composite material sample.

[0037] After the test plate 7 is located in the area of ​​the box body 3 for testing, it is necessary to continue testing the untested area of ​​the test plate 7. At this time, the motor and the heating plate 54 in the isolation motor box 51 are turned off, and the motor in the insulation motor box 551 is started. The output shaft of the motor gradually engages the feed gear 558 to rotate through the half gear 552 during rotation. Before the engaged feed gear 558 rotates, the cam 553 contacts and squeezes the connecting bar 554, and the connecting bar 554 drives the first sealing card seat 555 connected thereto to move. There are two sealing card seats 555 at the bottom of the box body 3, which are respectively located on the front and rear sides of the test plate 7. When the front sealing card seat 555 moves, it passes through the connecting bar 554. The groove on the upper part drives the toggle shaft 556 to rotate accordingly. The rotation of the toggle shaft 556 can also drive the rear sealing seat 555 to move, and the two sealing seats 555 move away from each other, that is, the clamping and blocking effect on the test plate 7 is lost. At the same time, two sealing seats 555 are also arranged at the top of the box body 3. The two sealing seats 555 are synchronously controlled by the toggle shaft 556 to achieve the same movement as the two sealing seats 555 at the bottom. Then, when the feed gear 558 rotates, the feed gear 558 automatically feeds the test plate 7 upward through the feed clamp 559 thereon, such as Figure 5 As shown, the feed gear 558 and its corresponding structure are both set to two, and the two feed gears 558 are engaged, thereby achieving the effect of automatically feeding the undetected test board 7 area. After feeding, the half gear 552 is disengaged from the feed gear 558. At the same time, the cam 553 also loses the squeezing work on the connecting bar 554. After the shaft rod 556 loses the squeezing force, it uses the elastic force to move and reset. The two groups of sealing seats 555 move relatively close to each other. After the movement, the surface of the test board 7 is clamped again to prevent heat leakage. Further, while realizing the automatic feeding test of the test board 7, according to the automatic judgment of the working state of the sealing seat 555, the test board 7 is flexibly clamped. When clamping, the effect of preventing heat leakage and heat blocking is achieved. When not clamping, the purpose of facilitating the automatic feeding of the test board 7 is achieved, thereby avoiding the problem of temperature error affecting the test results, and ensuring the accuracy of the test results of the box 3.

[0038] The above implementation methods are only used to illustrate the embodiments of the present invention, and are not limitations of the embodiments of the present invention. Ordinary technicians in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the embodiments of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the embodiments of the present invention. The patent protection scope of the embodiments of the present invention should be defined by the claims.

Claims

1. A high and low temperature static tensile load test chamber, comprising a test chamber base (1), characterized in that: The testing machine base (1) is connected to a crossbeam (2), the crossbeam (2) is connected to a box (3), the box (3) is connected to a visual glass window (4), an auxiliary uniform heating test device (5) is arranged inside the box (3), a test board (7) is arranged inside the auxiliary uniform heating test device (5), the auxiliary uniform heating test device (5) realizes the work of uniformly heating the test board (7), preventing heat leakage and cooling and isolating the undetected area, and a monitoring device (6) is arranged on the crossbeam (2); The auxiliary uniform heating test device (5) comprises an isolation motor box (51), an anti-leakage feeding device (55) and a cooling device (56); the end of the isolation motor box (51) is connected to the inside of the box body (3); the inside of the isolation motor box (51) is connected to a driving gear (52) via the output shaft of the motor; the surface of the driving gear (52) is meshed with a toothed disc base (53); the inner wall of the toothed disc base (53) is fixedly connected to a heating plate (54); The end of the driving gear (52) is rotatably connected to the interior of the isolation motor box (51), the surface of the toothed disc base (53) is rotatably connected to a support seat (57), and the surface of the support seat (57) is fixedly connected to the interior of the box body (3); The anti-leakage feeding device (55) comprises a temperature-insulating motor box (551), the end of which is connected to the interior of the box body (3), the interior of the temperature-insulating motor box (551) is connected to a half gear (552) via the output shaft of the motor, the half gear (552) is fixedly connected to a cam (553), the cam (553) is connected to a connecting bar (554), the end of the connecting bar (554) is fixedly connected to a sealing seat (555), and the sealing seat (555) is slidably connected to a toggle shaft (556); The surface of the connecting bar (554) is slidably connected to a connecting seat (557), an end of the connecting seat (557) is fixedly connected to the inside of the box (3), an end of the shifting shaft (556) is elastically connected to the inside of the connecting seat (557) via a torsion spring, the surface of the sealing seat (555) is slidably connected to the inside of the box (3), and the surface of the sealing seat (555) is connected to the surface of the test plate (7); The monitoring device (6) comprises a rotating arm (61), the end of which is rotatably connected to the inside of the crossbeam (2), the inside of the rotating arm (61) is connected to a telescopic rod (62), the end of which is fixedly connected to a monitoring base (63), the monitoring base (63) is connected to a light source lamp (64) and a camera (65), the inside of the rotating arm (61) is fixedly connected to a clamping block, and the rotating arm (61) is clamped and fixed to the telescopic rod (62) via the clamping block.

2. A high and low temperature static tensile load test chamber according to claim 1, characterized in that: The testing machine base (1) is connected to a testing machine chuck (8), and the interior of the testing machine chuck (8) is connected to the surface of the test plate (7).

3. A high and low temperature static tensile load test chamber according to claim 1, characterized in that: The anti-leakage feeding device (55) also includes a feeding gear (558), the end of which is fixedly connected to a feeding clamping rod (559), the end of which is rotatably connected to a connecting seat (557), and a rubber roller is fixedly connected to the feeding clamping rod (559).

4. A high and low temperature static tensile load test chamber according to claim 1, characterized in that: The cooling device (56) comprises a cooling box (561), which is installed at the bottom of the box body (3). A fan (562) and a semiconductor refrigerator (563) are respectively installed inside the cooling box (561), and an end of the cooling box (561) is fixedly connected to an air guide base (564).

Images