Low-temperature impact test device

Abstract

The invention relates to the technical field of impact test devices, and particularly discloses a low-temperature impact test device which comprises a low-temperature box and a test rack installed in the low-temperature box. The brake cable penetrates out of the inner wall of the low-temperature box and is fixedly connected with a brake handle; according to the low-temperature impact test device, cable ends with different bending radians are clamped through the arrangement of the arrangement assemblies, the difficulty of mounting a to-be-tested cable by a worker is reduced, the influence of the worker on the surface temperature of the cable in the mounting process is reduced, and the test efficiency is improved. And when the cable is cooled to a set temperature by the low-temperature box, the cable is subjected to a cold contraction phenomenon due to the basic physical property of thermal expansion and cold contraction, and a compensation clamping force is applied to the cable through the placement assembly, so that the situation that the cable is unstable in fixation after the diameter of the cable is contracted, the cable is misplaced when the cable is impacted by a drop hammer, and the measurement result is influenced is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of impact test devices, in particular to a low-temperature impact test device. Background Art

[0002] The low-temperature impact test device for cables is a device specially used to test the impact resistance of cables in low-temperature environments. It is used to evaluate the cold resistance and impact resistance of cables in low-temperature environments.

[0003] When conducting a low-temperature impact test on a cable, it is usually necessary to place the cable sample and the impact device in a low-temperature box and cool them according to the specified temperature and time. Then, use the impact device to perform an impact test on the cable sample, observe and record changes in its appearance, insulation performance, etc., and finally, judge the impact resistance of the cable sample according to the evaluation criteria.

[0004] When fixing cables, in order to avoid putting pressure on the cables, V-shaped side plates or movable card plates are generally used to fix the cables so as not to directly apply pressure on the cables. However, some cables are usually coiled on cable reels when stored, so that when workers cut samples, the removed cables will be bent, causing workers to spend time fixing the cables, which not only increases the workload of the workers, but also causes long-term contact with the cables during the installation process to conduct heat to the cables, affecting the surface temperature of the cables, thereby interfering with the test results. For this reason, we propose a low-temperature impact test device. Summary of the invention

[0005] The object of the present invention is to provide a low-temperature impact test device to solve the problem proposed in the above background technology that the workers need to spend time to fix the cables, which not only increases the workload of the workers, but also long-term contact with the cables during the installation process will cause heat conduction to the cables, affecting the surface temperature of the cables, thereby interfering with the test results.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a low-temperature impact test device, comprising a low-temperature box and a test frame, the test frame is installed inside the low-temperature box; and further comprising: a brake line, the brake line is connected to the test frame, the brake line passes through the inner wall of the low-temperature box and is fixedly connected to a brake handle;

[0007] An impact assembly, the impact assembly includes a guide rod, a plurality of guide rods are provided, the guide rods are slidably connected to the inner wall of the test frame, a drop weight is slidably connected to the surface of the guide rod, and the drop weight is connected to the test frame;

[0008] The placement components are arranged in plurality and correspond to the positions of the guide rods. The placement components are connected to the surface of the test frame. The placement components clamp the ends of cables with different bending radians, and after the cables are cooled at low temperatures, the placement components adaptively adjust the clamping range according to the cold shrinkage of the cables.

[0009] Among them, the placement component includes a placement frame, a placement groove is opened on the surface of the test frame, the placement frame is located on the inner wall of the placement groove, a V-shaped groove is opened on the surface of the placement frame, a rotating rod is rotatably connected to the inner wall of the placement frame, an upper cover plate is fixedly connected to the outer side of the rotating rod, an adjusting part for adjusting the angle of the placement frame is provided on the outer side of the placement frame, and a support part is provided on the inner wall of the V-shaped groove for assisting in fixing the cable after the cable is cooled.

[0010] Among them, the adjusting part includes rotating shafts located at both ends of the placement frame, which are rotatably connected to the inner wall of the test frame. A micro motor is fixedly connected to the outside of one of the rotating shafts, and the micro motor is installed on the inner wall of the test frame. A control part for controlling the operation of the micro motor is provided on the outside of the upper cover plate.

[0011] Among them, the control component includes a placement groove opened under the upper cover plate, a connecting plate is fixedly connected to the inner wall of the placement groove, multiple pressure sensors are installed under the connecting plate, a controller is installed above the connecting plate, multiple pressure sensors are connected to the controller, and the controller is connected to the micro motor.

[0012] Among them, the support member includes a support plate located on the inner wall of the V-shaped groove, a support rod is fixedly connected to the bottom of the support plate, the support rod is slidably connected to the inner wall of the placement frame, a transmission screw is rotatably connected to the inner wall of the placement frame, the transmission screw is threadedly connected to the support rod, a limit block is fixedly connected to the outer side of the support rod, the limit block is slidably connected to the inner wall of the placement frame, and a transmission member is provided on the outer side of the transmission screw to drive the transmission screw to rotate.

[0013] Among them, the upper surface of the support plate is in a concave arc shape.

[0014] Among them, the transmission part includes a worm wheel fixedly connected to the outer side of the transmission screw, a worm is meshed on the outer side of the worm wheel, both ends of the worm are rotatably connected to the inner wall of the placement frame, a transmission gear is fixedly connected to the outer side of one end of the worm, a transmission rack is meshed on the outer side of the transmission gear, the transmission rack is slidably connected to the inner wall of the placement frame, one end of the transmission rack is fixedly connected to a piston plate, a connecting hole is opened on the inner wall of the placement frame, the piston plate is slidably connected to the inner wall of the connecting hole, and an inflatable part for inflating the inner walls of multiple placement frames is provided on the outer side of the test frame.

[0015] Wherein, a return spring is fixedly connected to the outer side of the piston plate, and the return spring is fixedly connected to the inner wall of the connecting hole.

[0016] Among them, the inflatable part includes an air pipe connected to the connecting hole, a distribution box is connected to the outside of multiple air pipes, an electromagnetic valve is installed on the outside of one end of the air pipe close to the distribution box, two distribution box ends are connected with a Y-shaped tube, the Y-shaped tube is connected to an air pump, and the air pump is installed inside the low temperature box.

[0017] The distribution box is hollow and connected to the Y-shaped tube and the gas pipe respectively.

[0018] The present invention has at least the following beneficial effects:

[0019] When the present application is in use, the ends of cables with different bending radians are clamped by the arranged placement components, thereby reducing the difficulty for workers to install the cables to be tested and reducing the impact of the workers on the surface temperature of the cables during the installation process. When the cables are cooled to a set temperature in a low-temperature box, the cables will shrink due to the basic physical property of thermal expansion and contraction. A compensating clamping force is applied to the cables through the placement components, thereby avoiding unstable cable fixation after the cable diameter shrinks, resulting in cable misalignment when a falling hammer impacts the cable, thereby affecting the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the cryogenic box of the present invention;

[0022] Figure 3 This is a schematic diagram of the test stand structure of the present invention;

[0023] Figure 4 It is a schematic diagram of a front and cross-sectional view of the mounting frame of the present invention;

[0024] Figure 5 for Figure 4 Enlarged schematic diagram of area A in the middle;

[0025] Figure 6 This is a schematic diagram of the support structure of the present invention;

[0026] Figure 7 This is a bottom view schematic diagram of the upper cover plate of the present invention;

[0027] Figure 8 This is a schematic diagram of the separation of the control component and the upper cover plate of the present invention.

[0028] In the figure: 1, low temperature box; 2, test stand; 3, brake line; 4, brake handle; 5, impact assembly; 50, guide rod; 51, drop weight; 6, placement assembly; 60, placement frame; 61, placement groove; 62, V-shaped groove; 63, rotating rod; 64, upper cover; 65, adjustment member; 66, support member; 67, rotating shaft; 68, micro motor; 69, control member; 610, placement groove; 611, connecting plate; 612, pressure sensor; 6 13. Controller; 614. Support plate; 615. Support rod; 616. Transmission screw; 617. Limit block; 618. Transmission member; 619. Worm gear; 620. Worm; 621. Transmission gear; 622. Transmission rack; 623. Piston plate; 624. Connecting hole; 625. Inflatable member; 626. Return spring; 627. Air pipe; 628. Distribution box; 629. Solenoid valve; 630. Y-type tube; 631. Air pump. DETAILED DESCRIPTION

[0029] 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.

[0030] Embodiment 1

[0031] See also Figures 1 to 8 The present invention provides a technical solution: a low-temperature impact test device, comprising a low-temperature box 1 and a test frame 2, wherein the test frame 2 is installed inside the low-temperature box 1; further comprising: a brake line 3, wherein the brake line 3 is connected to the test frame 2, the brake line 3 passes through the inner wall of the low-temperature box 1 and is fixedly connected to a brake handle 4; an impact component 5, wherein the impact component 5 comprises a guide rod 50, wherein a plurality of guide rods 50 are provided, wherein the guide rod 50 is slidably connected to the inner wall of the test frame 2, wherein a drop hammer 51 is slidably connected to the surface of the guide rod 50, and the drop hammer 51 is connected to the test frame 2; and a placement component 6, wherein a plurality of placement components 6 are provided and correspond to the positions of the guide rods 50, wherein the placement component 6 is connected to the surface of the test frame 2, wherein the placement component 6 clamps the ends of cables with different bending radians, and after the cables are cooled at low temperatures, the placement component 6 adaptively adjusts the clamping range according to the cold shrinkage of the cables.

[0032] Before conducting a formal test, the appropriate clamping force is determined by installing component 6. The clamping force is gradually adjusted to observe the performance of the cable during the impact, such as whether it moves, falls off, or has abnormal deformation, so as to determine the best clamping force and set this clamping force as the threshold pressure.

[0033] The staff inserts the cable end with a curved arc into the placement component 6, and clamps the cable end through the placement component 6, which reduces the difficulty of the staff to install the cable to be tested and reduces the influence of the staff on the surface temperature of the cable during the installation process. When the low-temperature box 1 cools the cable to the set temperature, the cable will shrink due to the basic physical property of thermal expansion and contraction. The placement component 6 applies a compensating clamping force to the cable, thereby avoiding the cable from being unstable after the cable diameter shrinks, resulting in cable misalignment when the drop hammer 51 hits the cable, affecting the measurement result. After the cable is fixed and stably fixed by the placement component 6, the low-temperature box 1 works to cool the test frame 2 and the cable. After cooling is completed, the staff presses the brake handle 4 to pull the brake line 3, and the brake line 3 allows the test frame 2 to release the limit on the drop hammer 51. The drop hammer 51 descends along the guide rod 50 under the action of gravity and hits the bottom of the guide rod 50, so that the guide rod 50 impacts the cable at the bottom, thereby completing the impact test on the cable.

[0034] The placement assembly 6 includes a placement frame 60, a placement groove 61 is opened on the surface of the test frame 2, the placement frame 60 is located on the inner wall of the placement groove 61, a V-shaped groove 62 is opened on the surface of the placement frame 60, a rotating rod 63 is rotatably connected to the inner wall of the placement frame 60, and an upper cover plate 64 is fixedly connected to the outer side of the rotating rod 63. An adjustment member 65 for adjusting the angle of the placement frame 60 is provided on the outer side of the placement frame 60, and a support member 66 for auxiliary fixing of the cable after the cable is cooled is provided on the inner wall of the V-shaped groove 62.

[0035] When installing the cable, the staff twists the rotating rod 63, and the rotating rod 63 drives the upper cover plate 64 to rotate, so as to cooperate with the staff to insert one end of the cable into the V-shaped groove 62 of the mounting frame 60. After the end of the cable is placed in the V-shaped groove 62, the staff twists the rotating rod 63 in the opposite direction, so that the upper cover plate 64 covers the V-shaped groove 62 again. The V-shaped groove 62 cooperates with the upper cover plate 64 to limit the cable end. The adjustment member 65 adjusts the position of the mounting frame 60 by detecting the squeezing force of the cable on the inside of the adjustment member 65, so that the clamping force of the cable is within the threshold range, and the support member 66 is provided to assist in fixing the cable after the cable is cooled, so that after the cable shrinks, a compensating clamping force is applied to the cable to keep the clamping force of the cable within the optimal clamping force range determined before the test, so as to avoid displacement of the cable during the impact process.

[0036] The adjusting member 65 includes rotating shafts 67 respectively located at both ends of the mounting frame 60, and the rotating shafts 67 are rotatably connected to the inner wall of the test frame 2. A micro motor 68 is fixedly connected to the outer side of one of the rotating shafts 67, and the micro motor 68 is installed on the inner wall of the test frame 2. A control member 69 for controlling the operation of the micro motor 68 is provided on the outer side of the upper cover plate 64.

[0037] After the staff puts the cable end into the V-shaped groove 62, they put the upper cover 64 back on the V-shaped groove 62, and detect the pressure between the cable and the control component 69. The control component 69 compares the detected pressure with the threshold pressure measured before the test. According to the pressure change, the control component 69 drives the micro motor 68 to work, and the micro motor 68 drives the rotating shaft 67 to rotate, thereby adjusting the direction of the mounting frame 60, so that the mounting frame 60 can quickly and stably clamp the two ends of the arc cable, reducing the difficulty of the staff to install the arc cable.

[0038] The control component 69 includes a placement groove 610 opened below the upper cover plate 64, a connecting plate 611 is fixedly connected to the inner wall of the placement groove 610, a plurality of pressure sensors 612 are installed below the connecting plate 611, a controller 613 is installed above the connecting plate 611, the plurality of pressure sensors 612 are connected to the controller 613, and the controller 613 is connected to the micro motor 68.

[0039] When the cable is located between the V-groove 62 and the upper cover plate 64, the multiple pressure sensors 612 on the lower side of the upper cover plate 64 contact the surface of the cable, and the pressure between the cable and the pressure sensor 612 is detected by the pressure sensor 612. The pressure sensor 612 transmits the detected pressure signal to the controller 613, and the controller 613 compares the detected pressure signal with the threshold pressure determined before the test. The controller 613 controls the micro motor 68 to work according to the comparison result, so that the mounting frame 60 rotates in the direction of the pressure sensor 612 where the detected pressure is greater than the threshold pressure, so as to avoid the situation where the cable surface is clamped too hard when the arc cable is fixed, thereby affecting the test result.

[0040] The support member 66 includes a support plate 614 located on the inner wall of the V-shaped groove 62, a support rod 615 is fixedly connected to the bottom of the support plate 614, the support rod 615 is slidably connected to the inner wall of the mounting frame 60, a transmission screw 616 is rotatably connected to the inner wall of the mounting frame 60, the transmission screw 616 is threadedly connected to the support rod 615, a limit block 617 is fixedly connected to the outer side of the support rod 615, the limit block 617 is slidably connected to the inner wall of the mounting frame 60, and a transmission member 618 is provided on the outer side of the transmission screw 616 to drive the transmission screw 616 to rotate.

[0041] As the cable is cooled and stored in a low-temperature environment, due to the basic physical property of thermal expansion and contraction, the cable will shrink after a long period of cooling, causing the pressure detected by the pressure sensor 612 to decrease. After the pressure sensor 612 transmits the pressure reduction signal to the controller 613, the controller 613 drives the transmission member 618 to work, the transmission member 618 drives the transmission screw 616 to rotate, the transmission screw 616 drives the support rod 615 to move upward, the support rod 615 drives the limit block 617 to slide on the inner wall of the mounting frame 60, the support rod 615 pushes the support plate 614 close to the cable and squeezes the cable, so that the pressure signal detected by the pressure sensor 612 reaches the threshold pressure again, thereby avoiding the shrinkage of the cable during low-temperature cooling, resulting in unstable fixation, and affecting the test results when the drop hammer 51 impacts the cable.

[0042] The transmission member 618 includes a worm wheel 619 fixedly connected to the outer side of the transmission screw rod 616, a worm 620 is meshed on the outer side of the worm wheel 619, both ends of the worm 620 are rotatably connected to the inner wall of the mounting frame 60, a transmission gear 621 is fixedly connected to the outer side of one end of the worm 620, a transmission rack 622 is meshed on the outer side of the transmission gear 621, the transmission rack 622 is slidably connected to the inner wall of the mounting frame 60, one end of the transmission rack 622 is fixedly connected to a piston plate 623, a connecting hole 624 is provided on the inner wall of the mounting frame 60, the piston plate 623 is slidably connected to the inner wall of the connecting hole 624, a return spring 626 is fixedly connected to the outer side of the piston plate 623, and the return spring 626 is fixedly connected to the inner wall of the connecting hole 624, and an inflatable member 625 for inflating the inner walls of multiple mounting frames 60 is provided on the outer side of the test frame 2.

[0043] When the transmission member 618 is working, the inflatable member 625 inflates air into the placement frame 60. After the gas enters the placement frame 60, it pushes the piston plate 623 to slide. The piston plate 623 stretches the reset spring 626, and the piston plate 623 drives the transmission rack 622 to slide along the inner wall of the placement frame 60. The transmission rack 622 drives the transmission gear 621 to rotate, and the transmission gear 621 drives the worm 620 to rotate. The worm 620 drives the worm wheel 619 to rotate, so that the transmission screw 616 rotates on the inner wall of the placement frame 60 to cooperate in applying a compensating clamping force to the cable.

[0044] The inflatable member 625 includes an air pipe 627 connected to the connecting hole 624, and a distribution box 628 is connected to the outside of the multiple air pipes 627. A solenoid valve 629 is installed on the outside of one end of the air pipe 627 close to the distribution box 628. The ends of the two distribution boxes 628 are connected to a Y-shaped tube 630, and the Y-shaped tube 630 is connected to an air pump 631. The air pump 631 is installed inside the low-temperature box 1. The distribution box 628 is hollow and is respectively connected to the Y-shaped tube 630 and the air pipe 627.

[0045] The air pump 631 works to supply gas to the Y-tube 630, and the Y-tube 630 guides the gas into the two distribution boxes 628. When the pressure sensor 612 detects that the pressure between the cable is lower than the threshold pressure determined before the test, the controller 613 controls the corresponding solenoid valve 629 on the outside to open, and the gas in the distribution box 628 enters the connecting hole 624 through the gas supply pipe 627, so that the air pressure in the connecting hole 624 increases to cooperate with pushing the piston plate 623 to slide on the inner wall of the connecting hole 624.

[0046] Embodiment 2

[0047] In the second embodiment, other structures remain unchanged, and the difference from the first embodiment is that the upper surface of the support plate 614 is in a concave arc shape to fit with the bottom of the cable, increase the contact area with the cable, and improve the clamping stability.

[0048] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0049] 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 low temperature impact test device, comprising: A low temperature box (1) and a test stand (2), wherein the test stand (2) is installed inside the low temperature box (1); It is characterized by: also including: A brake line (3), the brake line (3) being connected to the test frame (2), the brake line (3) passing through the inner wall of the low temperature box (1) and being fixedly connected to a brake handle (4); An impact assembly (5), the impact assembly (5) comprising a guide rod (50), a plurality of guide rods (50) being provided, the guide rod (50) being slidably connected to an inner wall of a test frame (2), a drop weight (51) being slidably connected to a surface of the guide rod (50), and the drop weight (51) being connected to the test frame (2); A placement assembly (6), wherein a plurality of the placement assemblies (6) are provided and correspond to the positions of the guide rods (50), the placement assembly (6) is connected to the surface of the test frame (2), the placement assembly (6) clamps the ends of cables with different bending radians, and after the cables are cooled at low temperatures, the placement assembly (6) adaptively adjusts the clamping range according to the cold shrinkage of the cables.

2. The low temperature impact test device according to claim 1, characterized in that: The placement assembly (6) comprises a placement frame (60), a placement groove (61) is provided on the surface of the test frame (2), the placement frame (60) is located on the inner wall of the placement groove (61), a V-shaped groove (62) is provided on the surface of the placement frame (60), a rotation rod (63) is rotatably connected to the inner wall of the placement frame (60), an upper cover plate (64) is fixedly connected to the outer side of the rotation rod (63), an adjustment member (65) for adjusting the angle of the placement frame (60) is provided on the outer side of the placement frame (60), and a support member (66) for auxiliary fixing of the cable after the cable is cooled is provided on the inner wall of the V-shaped groove (62).

3. The low temperature impact test device according to claim 2, characterized in that: The adjusting member (65) comprises rotating shafts (67) respectively located at two ends of the placement frame (60), the rotating shafts (67) being rotatably connected to the inner wall of the test frame (2), a micro motor (68) being fixedly connected to the outer side of one of the rotating shafts (67), the micro motor (68) being mounted on the inner wall of the test frame (2), and a control member (69) for controlling the operation of the micro motor (68) being provided on the outer side of the upper cover plate (64).

4. The low temperature impact test device according to claim 3, characterized in that: The control component (69) comprises a placement groove (610) opened below the upper cover plate (64); a connecting plate (611) is fixedly connected to the inner wall of the placement groove (610); a plurality of pressure sensors (612) are installed below the connecting plate (611); a controller (613) is installed above the connecting plate (611); the plurality of pressure sensors (612) are connected to the controller (613); and the controller (613) is connected to the micro motor (68).

5. The low temperature impact test device according to claim 2, characterized in that: The support member (66) comprises a support plate (614) located on the inner wall of the V-shaped groove (62); a support rod (615) is fixedly connected to the bottom of the support plate (614); the support rod (615) is slidably connected to the inner wall of the mounting frame (60); a transmission screw (616) is rotatably connected to the inner wall of the mounting frame (60); the transmission screw (616) is threadedly connected to the support rod (615); a limit block (617) is fixedly connected to the outer side of the support rod (615); the limit block (617) is slidably connected to the inner wall of the mounting frame (60); and a transmission member (618) is provided on the outer side of the transmission screw (616) for driving the transmission screw (616) to rotate.

6. The low temperature impact test device according to claim 5, characterized in that: The upper surface of the support plate (614) is in a concave arc shape.

7. The low temperature impact test device according to claim 5, characterized in that: The transmission member (618) comprises a worm wheel (619) fixedly connected to the outer side of the transmission screw (616); a worm (620) is meshed on the outer side of the worm wheel (619); two ends of the worm (620) are rotatably connected to the inner wall of the mounting frame (60); a transmission gear (621) is fixedly connected to the outer side of one end of the worm (620); a transmission rack (622) is meshed on the outer side of the transmission gear (621); the transmission rack (622) is slidably connected to the inner wall of the mounting frame (60); one end of the transmission rack (622) is fixedly connected to a piston plate (623); a connecting hole (624) is provided on the inner wall of the mounting frame (60); the piston plate (623) is slidably connected to the inner wall of the connecting hole (624); and an inflatable member (625) for inflating the inner walls of the plurality of mounting frames (60) is provided on the outer side of the test frame (2).

8. The low temperature impact test device according to claim 7, characterized in that: A return spring (626) is fixedly connected to the outer side of the piston plate (623), and the return spring (626) is fixedly connected to the inner wall of the connecting hole (624).

9. The low temperature impact test device according to claim 7, characterized in that: The inflatable member (625) includes an air supply pipe (627) connected to the connecting hole (624), and a distribution box (628) is connected to the outside of the plurality of air supply pipes (627). An electromagnetic valve (629) is installed on the outside of one end of the air supply pipe (627) close to the distribution box (628). The ends of the two distribution boxes (628) are connected to a Y-shaped tube (630), and the Y-shaped tube (630) is connected to an air pump (631), and the air pump (631) is installed inside the low temperature box (1).

10. The low temperature impact test device according to claim 9, characterized in that: The distribution box (628) is hollow and is connected to the Y-shaped tube (630) and the gas supply pipe (627) respectively.

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