Multi-angle impact vibration test fixture and method for electronic equipment chassis

Abstract

The present invention discloses a multi-angle impact vibration test fixture and method for an electronic device chassis, including a chassis vibration test frame, the chassis vibration test frame including a mounting frame and a clamping frame, the mounting frame including a bottom plate and a vertical plate mounted on the bottom plate, a rotating shaft is mounted on the vertical plate through a bearing, and the two shaft ends of the rotating shaft extend out of the left and right end surfaces of the vertical plate respectively; the clamping frame is mounted on the corresponding shaft end of the rotating shaft on one side of the vertical plate; a ratchet mechanism is installed between the other shaft end of the rotating shaft and the corresponding end surface of the vertical plate, and a limiting mechanism for limiting the ratchet mechanism to drive the clamping frame to rotate in the positive direction is provided on the end surface of the vertical plate. The present invention adopts a mechanism for manually pressing the electronic device chassis, which can adjust the pushing distance of the pressing block and has strong adaptability; the clamping frame can rotate at multiple angles, and can realize impact tests in different directions without disassembling the electronic device chassis.

Description

Technical Field

[0001] The invention relates to an anti-impact vibration test of an electronic device, in particular to a multi-angle impact vibration test fixture and method for an electronic device chassis. Background Art

[0002] During the service life of electronic equipment, the equipment will be harmed by instantaneous impact and vibration. Therefore, it is necessary to assess whether the functions and performance of the electronic equipment meet the requirements under the expected impact environment conditions, and whether the structure of the electronic equipment has residual deformation, cracks and other mechanical damage.

[0003] According to the requirements of the shock and vibration test standards for electronic equipment, the electronic equipment must be subjected to shocks of the number of times specified in the relevant specifications along the six axes of the three orthogonal axes. However, the tabletops of the shock and vibration test benches commonly used in the market are all horizontal and cannot rotate, while most electronic equipment are flat square boxes. Without a fixture, the equipment can only be impacted in the upper and lower axis directions, and cannot be impacted in the front, rear, left, and right axis directions. Therefore, it is necessary to design a fixture that can be used to place and fix electronic equipment vertically to assist in testing the shock and vibration resistance of the front, rear, left, and right axes of electronic equipment.

[0004] Currently, there are three main structural forms of electronic equipment chassis clamps: L-type, inverted T-type and box-type. However, most of them can only clamp the equipment in one direction, and cannot impose constraints in other directions or conveniently adjust the impact and vibration angle.

[0005] For example, the utility model patent "Clamp on Drop Ball Impact Tester" with authorization number CN204740175U discloses a clamp with a squeezing device, which mainly includes a push rod, a spring and a fixed plate. The squeezing device relies on the elastic force of the spring to clamp the test object. The clamping force is small and is not suitable for clamping the chassis of electronic equipment with heavy weight during impact and vibration tests.

[0006] For example, the invention patent "A drop-hammer multi-angle impact fixture with a stable impact position" with application number CN110658059A discloses a drop-hammer multi-angle impact fixture with a stable impact position. The rotating frame is a special-shaped structure and is not easy to process and form.

[0007] For example, the utility model patent "A fixture for vibration and impact testing" with authorization number CN208921386U discloses a fixture that can rotate 90°. The fixture structure is relatively simple, but there is no part clamping device, and it is only suitable for chassis that can be directly mounted on a vertical plate.

[0008] The structures of the above-mentioned patent applications cannot be directly fixed to the vertical plate for the electronic equipment chassis, so there is no suitable clamp available. Summary of the invention

[0009] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to propose an impact vibration test fixture and method that can achieve multi-angle clamping of an electronic device chassis.

[0010] An electronic equipment chassis multi-angle impact vibration test fixture capable of solving the above-mentioned technical problems, wherein the technical solution thereof comprises a chassis vibration test frame, wherein the chassis vibration test frame comprises a mounting frame and a clamping frame, wherein the mounting frame comprises a base plate and a vertical plate mounted on the base plate, wherein a rotating shaft is mounted on the vertical plate through a bearing, wherein two axial ends of the rotating shaft respectively extend out of the left and right end surfaces of the vertical plate; wherein the clamping frame is mounted on the corresponding axial end of the rotating shaft on one side of the vertical plate; wherein a ratchet mechanism is installed between the other axial end of the rotating shaft and the corresponding end surface of the vertical plate, wherein a limiting mechanism for limiting the positive rotation angle of the clamping frame driven by the ratchet mechanism is provided on the end surface of the vertical plate.

[0011] One structure of the limiting mechanism includes a limiting rod inserted on the corresponding shaft end of the rotating shaft. Within the rotation range of the left and right rod bodies of the limiting rod, multiple groups of threaded holes that are evenly distributed around the circumference and opposite to each other with the axis are opened on the corresponding end faces of the vertical plate, and limiting screws that prevent the corresponding rod bodies from rotating in the positive direction are screwed into the threaded holes that are opposite to each other.

[0012] A structure of the ratchet mechanism includes a ratchet and a pawl, wherein the ratchet is mounted on the corresponding shaft end of the rotating shaft, and the pawl is rotatably mounted on the corresponding end surface of the vertical plate. Under the action of a spring installed on the corresponding end surface of the vertical plate, the pawl engages with the ratchet teeth of the ratchet to prevent the ratchet from rotating in the opposite direction.

[0013] One structure of the clamping frame includes a base plate installed on the corresponding shaft end of the rotating shaft, a supporting plate is installed at the bottom of the base plate, and a left plate and a right plate are installed on the left and right sides of the base plate respectively. The supporting plate and the left and right plates constitute a frame of the electronic equipment chassis in place, and a pressure plate is provided on one side of the frame, and at least two upper and lower positioning screws are screwed on the pressure plate, and each positioning screw is slidably installed in a sliding sleeve on the corresponding side plate, and at least two upper and lower clamping screws acting on the pressure plate are screwed on the side plate; at least two upper and lower pressure strips are installed between the left and right plates by screws.

[0014] The method of the present invention for performing a multi-angle impact vibration test on an electronic equipment chassis comprises the following steps:

[0015] 1. Place the electronic equipment chassis in the frame of the clamping frame, tighten the clamping screw on one side plate and push the pressure plate to press the electronic equipment chassis onto the other side plate.

[0016] 2. Install the upper and lower pressure strips on the left and right panels to fix the electronic equipment chassis at the front and back.

[0017] 3. Rotate the limit rod forward to rotate the clamping frame and the electronic equipment chassis to the required anti-seismic angle, screw the limit screws into the corresponding set of threaded holes to limit the position of the limit rod to prevent the limit rod from rotating forward.

[0018] 4. Install the base plate on a vibration test bench to perform an impact test on the electronic equipment chassis.

[0019] 5. After the test is completed, unscrew the limit screws, turn the limit rod forward to rotate the clamping frame and the electronic equipment chassis 180°, screw the limit screws into another set of corresponding threaded holes to perform an impact test on the electronic equipment chassis in another orthogonal direction.

[0020] Beneficial effects of the present invention:

[0021] 1. In the structure of the present invention, a manual pressing mechanism for the electronic equipment chassis is adopted, and the pushing distance of the pressing block can be adjusted. The adaptability is strong, and the electronic equipment chassis is easy to install. Compared with the electric pressing mechanism using a motor, it can better adapt to the actual conditions of the impact test.

[0022] 2. In the structure of the present invention, the clamping frame can rotate at multiple angles, so that impact tests in different directions can be performed without disassembling the chassis of the electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an axonometric view of an embodiment of the present invention.

[0024] Figure 2 for Figure 1 Rear view of an embodiment.

[0025] Figure 3 for Figure 1 A partial view in the figure.

[0026] Figure 4 for Figure 1 Schematic diagram of the structure of the ratchet mechanism and the limit mechanism.

[0027] Figure 5 For use Figure 1 Axonometric view of a rail-mounted subrack according to an embodiment.

[0028] Figure number identification: 1. Base plate; 2. Vertical plate; 2-1 Handle hole; 3. Rotating shaft; 4. Ratchet mechanism; 4-1. Ratchet; 4-2. Paw; 4-3. Spring piece; 5. Limiting mechanism; 5-1. Limiting rod; 5-2. Threaded hole; 5-3. Limiting screw; 6. Base plate; 7. Support plate; 8. Left side plate; 9. Right side plate; 10. Pressure plate; 11. Positioning screw; 12. Clamping screw; 13. Pressure strip; 14. Guide rail mounted plug-in box; 14-1. Guide rail; 14-2. Connector; 14-3. Mounting hole; 15. Clamp. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described below in conjunction with the embodiments shown in the accompanying drawings.

[0030] The present invention is particularly suitable for clamping and installing a rail-mounted plug-in box 14 (a type of electronic equipment chassis, which is a flat rectangular parallelepiped body). The left and right box plates of the rail-mounted plug-in box 14 are both provided with rails 14-1, the bottom plate of the rail-mounted plug-in box 14 is provided with a plurality of connectors 14-2, and the left and right sides of the top plate of the rail-mounted plug-in box 14 are also provided with mounting holes 14-3. Figure 5 shown.

[0031] The invention discloses a multi-angle impact vibration test fixture for an electronic equipment chassis, comprising a chassis vibration test frame, wherein the chassis vibration test frame comprises a mounting frame installed on a vibration test table and a clamping frame installed on the mounting frame.

[0032] The mounting frame includes a bottom plate 1 and a vertical plate 2, wherein the vertical plate 2 is vertically arranged in the middle of the bottom plate 1, and the vertical plate 2 is clamped by left and right clamping plates 15, and the left and right clamping plates 15 are fixedly installed on the bottom plate 1 with screws, and a handle hole 2-1 is opened in the upper center of the vertical plate 2, and a rotating shaft 3 penetrating the plate body is installed in the middle of the vertical plate 2 through a bearing, and a clamping frame is installed on the front axial end of the rotating shaft 3, and a ratchet mechanism 4 is installed between the rear axial end of the rotating shaft 3 and the rear end surface of the vertical plate 2, and a limiting mechanism 5 is provided on the rear end surface of the vertical plate 2, and the limiting mechanism 5 limits the angle of the positive rotation of the clamping frame driven by the ratchet mechanism 4, such as Figure 1 , Figure 2 shown.

[0033] The main body of the clamping frame is a base plate 6, which is installed on the front shaft end of the rotating shaft 3 and fits the front end surface of the vertical plate 2. A support plate 7 is installed at the bottom of the front end surface of the base plate 6. The left and right sides of the front end surface of the base plate 6 are respectively installed with a left side plate 8 and a right side plate 9. The support plate 7, the left side plate 8 and the right side plate 9 constitute a frame for placing the guide rail mounted plug-in box 14. The support plate 7 is provided with a clearance hole for avoiding each connector 14-2. A vertical pressing plate 10 is provided on the right side of the frame. The upper, middle and lower three sliding sleeves on the side plate 9 are all slidably installed with positioning screws 11 that are screwed with the pressure plate 10. The right side plate 9 is also screwed with the upper, middle and lower three clamping screws 12 that can act on the pressure plate 10. The screwing of the three clamping screws 12 can push the pressure plate 10 to the left. Each clamping screw 12 is sleeved with a spring that is pressed on the right side plate 9 to prevent the clamping screw 12 from loosening. The end surfaces of the left side plate 8 and the right side plate 9 are installed with upper and lower pressure strips 13 by screws. Figure 1 , Figure 2 , Figure 3 shown.

[0034] The ratchet mechanism 4 includes a ratchet 4-1 and a pawl 4-2. The ratchet 4-1 is mounted on the rear end of the rotating shaft 3 and is attached to the rear end surface of the vertical plate 2. The pawl 4-2 is rotatably mounted on the rear end surface of the vertical plate 2 and is located on one side above the ratchet 4-1. The pawl 4-2 is engaged with the ratchet teeth of the ratchet 4-1 under the action of the spring 4-3 installed on the rear end surface of the vertical plate 2, so that the ratchet 4-1 can only rotate in the forward direction (clockwise direction of the arrow in the figure). Figure 1 , Figure 4 shown.

[0035] The limiting mechanism 5 includes a limiting rod 5-1 installed through the rotating shaft 3. The limiting rod 5-1 can rotate with the rotating shaft 3 and rotate synchronously with the ratchet 4-1. Within the rotation range of the left and right rod bodies of the limiting rod 5-1, four groups of threaded holes 5-2 that are evenly distributed on the circumference and opposite to each other with the axis are opened on the rear end surface of the vertical plate 2. Limiting screws 5-3 are screwed into each group of threaded holes 5-2 that are opposite to each other. The limiting screws 5-3 can block the positive rotation of the corresponding rod body and limit the rotation position of the limiting rod 5-1, that is, the ratchet 4-1. Figure 1 , Figure 4 shown.

[0036] The present invention is used to perform a multi-angle impact vibration test on the rail-mounted plug-in box 14, and the operation steps are as follows:

[0037] 1. Place the guide rail mounted plug-in box 14 in the frame of the clamping frame. The bottom plate of the guide rail mounted plug-in box 14 is located on the support plate 7. The left and right box plates of the guide rail mounted plug-in box 14 are placed between the left side plate 8 and the right side plate 9. Tighten the clamping screws 12 on the right side plate 9 and push the pressure plate 10 to press the guide rail mounted plug-in box 14 on the left side plate 8. The left side plate 8 is provided with a groove to avoid the left guide rail 14-1. The width of the pressure plate 10 is designed to avoid the right guide rail 14-1.

[0038] 2. Install the upper and lower pressure strips 13 on the left side plate 8 and the right side plate 9 and fix the position of the guide rail installation type plug-in box 14 at the front and rear.

[0039] 3. Rotate the limit rod 5-1 in the forward direction and drive the guide rail mounted plug box 14 to rotate to the anti-seismic angle required for detection through the clamping frame, screw the limit screws 5-3 into a corresponding set of two opposite threaded holes 5-2 to limit the position of the limit rod 5-1 and prevent the limit rod 5-1 from rotating forward.

[0040] 4. The base plate 1 is installed on the vibration test bench by lifting the riser 2, and then the rail-mounted plug-in box 14 can be subjected to an impact test.

[0041] 5. After the test is completed, unscrew the limit screw 5-3, rotate the limit rod 5-1 in the forward direction and rotate the rail-mounted plug-in box 14 180° through the clamping frame, and screw the limit screw 5-3 into the corresponding other set of threaded holes 5-2 that are opposite to each other, and then perform an impact test on the rail-mounted plug-in box 14 in another orthogonal direction.

[0042] The above embodiments are only specific examples for further describing the purpose, technical solutions and beneficial effects of the present invention, and the present invention is not limited thereto. Any modification, equivalent replacement, improvement, etc. made within the scope of the present invention are included in the protection scope of the present invention.

Claims

1. A multi-angle impact vibration test fixture for an electronic equipment chassis, including a chassis vibration test stand, characterized in that: The chassis vibration test frame comprises a mounting frame and a clamping frame, wherein the mounting frame comprises a base plate (1) and a vertical plate (2) mounted on the base plate (1), a rotating shaft (3) being mounted on the vertical plate (2) via a bearing, and two axial ends of the rotating shaft (3) respectively extending out of the left and right end surfaces of the vertical plate (2); the clamping frame is mounted on one side of the vertical plate (2) on the corresponding axial end of the rotating shaft (3); a ratchet mechanism (4) is mounted between the other axial end of the rotating shaft (3) and the corresponding end surface of the vertical plate (2), and a limiting mechanism (5) is provided on the end surface of the vertical plate (2) for limiting the positive rotation angle of the clamping frame driven by the ratchet mechanism (4); The limiting mechanism (5) comprises a limiting rod (5-1) which is inserted through the corresponding shaft end of the rotating shaft (3); within the rotation range of the left and right rod bodies of the limiting rod (5-1), a plurality of groups of threaded holes (5-2) which are evenly distributed around the circumference and opposite to each other with the axis center are provided on the corresponding end surface of the vertical plate (2); and limiting screws (5-3) which block the positive rotation of the corresponding rod body are screwed into the threaded holes (5-2) which are opposite to each other. The ratchet mechanism (4) comprises a ratchet (4-1) and a pawl (4-2), wherein the ratchet (4-1) is mounted on the corresponding shaft end of the rotating shaft (3), and the pawl (4-2) is rotatably mounted on the corresponding end surface of the vertical plate (2), and the pawl (4-2) is engaged with the ratchet teeth of the ratchet (4-1) under the action of a spring sheet (4-3) mounted on the corresponding end surface of the vertical plate (2) to prevent the ratchet (4-1) from rotating in the opposite direction; The clamping frame comprises a base plate (6) mounted on the corresponding shaft end of the rotating shaft (3), a supporting plate (7) is mounted on the bottom of the base plate (6), a left side plate (8) and a right side plate (9) are mounted on the left and right sides of the base plate (6), respectively, the supporting plate (7) and the left side plate (8) and the right side plate (9) constitute a frame of the electronic equipment chassis in place, a pressing plate (10) is provided on one side of the frame, at least two upper and lower positioning screws (11) are screwed on the pressing plate (10), each positioning screw (11) is slidably mounted in a sliding sleeve on the corresponding side plate, at least two upper and lower clamping screws (12) acting on the pressing plate (10) are screwed on the side plate; at least two upper and lower pressure strips (13) are installed between the left side plate (8) and the right side plate (9) by screws.

2. Multi-angle impact vibration test method for electronic equipment chassis, characterized in that The electronic equipment chassis multi-angle impact vibration test fixture of claim 1 is used, and the operation steps are as follows: ①, placing the electronic equipment chassis in the frame of the clamping frame, tightening the clamping screw (12) on one side plate and pushing the pressing plate (10) to press the electronic equipment chassis onto the other side plate; ②, installing the upper and lower pressure strips (13) on the left side plate (8) and the right side plate (9) to fix the electronic equipment chassis at the front and rear; ③, rotating the limit rod (5-1) in the forward direction to rotate the clamping frame and the electronic equipment chassis to the required anti-seismic angle, screwing the limit screw (5-3) into the corresponding set of threaded holes (5-2) to limit the position of the limit rod (5-1) to prevent the limit rod (5-1) from rotating in the forward direction; ④, installing the base plate (1) on a vibration test bench to perform an impact test on the chassis of the electronic equipment; ⑤. After the test is completed, unscrew the limit screw (5-3), rotate the limit rod (5-1) in the forward direction to rotate the clamping frame and the electronic equipment chassis 180°, screw the limit screw (5-3) into another set of corresponding threaded holes (5-2) to perform an impact test on the electronic equipment chassis in another orthogonal direction.

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