Testing tool for random vibration experiment

Abstract

The utility model provides a test tool for a random vibration experiment, which comprises a support and a vibration elastic sheet, the top of the support is provided with an installation position of the vibration elastic sheet, and the periphery of the installation position is provided with a longitudinal pressing device and a transverse pressing device which correspond to each other; wherein the vibration elastic sheet comprises a short part and a long part, the short part is used for being installed at the installation position, the short part is longitudinally pressed by the longitudinal pressing device in the vertical direction and clamped by the two transverse pressing devices in the horizontal direction, and the long part horizontally extends forwards and is used for installing a sensor for transmitting vibration signals. The problem that in the prior art, in the vibration testing process, a vibration elastic piece is inconvenient to fix is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning device detection tooling, in particular to a test tooling for random vibration experiments. Background Art

[0002] In the field of air-conditioning research and development, random vibration refers to the vibration that suddenly occurs during transportation and handling, which can easily cause damage to various components inside the air-conditioning, especially the pipelines. Therefore, simulation testing is required in the research and development stage. The verification of the simulation method usually does not directly test the pipelines of the air-conditioning. Instead, simple tools are used to verify and correct the simulation method and simulation process. Generally, a vibration shrapnel with a notch is used, one end is fixed and the other end is left hanging. After sticking a sensor on the vibration shrapnel, the tester uses a hammer to strike the hanging end in the vertical direction to simulate random vibration. At this time, the vibration signal is fed back by the vibration shrapnel, and the fracture of the shrapnel notch is observed.

[0003] The current problem is that there is no special tooling for fixing the vibrating shrapnel. Usually, the vibrating shrapnel is fixed at a high place with only one bolt. When using a hammer to hammer, the operator's hand shakes, causing the hammering direction of the hammer to tilt horizontally, causing it to shift horizontally, resulting in abnormal signal feedback from the sensor, affecting the collection of experimental data. Utility Model Content

[0004] In view of the deficiencies in the prior art, the present invention provides a test fixture for random vibration experiments, which solves the problem in the prior art that it is inconvenient to fix the vibration shrapnel during the vibration test.

[0005] According to an embodiment of the present utility model, a test fixture for random vibration experiments includes: a bracket and a vibration spring, wherein a mounting position for the vibration spring is provided on the top of the bracket, and corresponding longitudinal clamping devices and transverse clamping devices are provided around the mounting position; wherein, the vibration spring includes a short portion and a long portion, the short portion is used to be installed at the mounting position, the short portion is longitudinally clamped by the longitudinal clamping device in the vertical direction, and is clamped by two transverse clamping devices in the horizontal direction, the long portion extends horizontally forward, and the long portion is used to install a sensor that transmits a vibration signal.

[0006] Compared with the prior art, the utility model has the following beneficial effects: by reserving an installation position on the bracket, two lateral clamping devices are arranged on both sides of the installation position on the top of the bracket, the two lateral clamping devices clamp the vibration spring from both sides of the short part of the vibration spring, and the lateral clamping device presses the vibration spring from the top of the short part of the vibration spring, thereby achieving the fixation of the vibration spring, preventing the vibration spring from being offset due to human error in the process of knocking the vibration spring, and ultimately causing abnormal signal feedback from the sensor, affecting the collection of experimental data.

[0007] Furthermore, the bracket is specifically a rectangular frame; at least one first screw hole is provided at the lower end of the rectangular frame.

[0008] Furthermore, the mounting position is arranged in the center of the top of the bracket and close to the edge, and a gap is left between the mounting position and the two lateral clamping devices in the left and right directions. A middle protrusion is arranged on the top of the bracket and located at the rear side of the mounting position.

[0009] Furthermore, the longitudinal clamping device includes: an outer edge block and a stud, the outer edge block is fixed to the side wall of the middle protrusion, the outer edge block is located directly above the installation position, the short part of the vibration spring is inserted into the installation position, and a second screw hole for the stud to pass through is provided on the short part, and a third screw hole for the stud to be inserted is provided at the installation position.

[0010] Furthermore, the two lateral clamping devices each include: a push rod and a mounting column, the push rod passes through the mounting column horizontally, and the push rod is threadedly connected to the mounting column; the two mounting columns are arranged opposite to each other in the horizontal direction, and top blocks are provided on opposite sides of the two push rods, and the two top blocks are used to press against the two side walls of the short part.

[0011] Furthermore, it also includes a ranging bar, a horizontal square hole is provided on the bracket, the ranging bar is embedded in the square hole to achieve a sliding connection, a scale is provided on the ranging bar, an expansion block is provided at the end of the ranging bar, a positioning block located directly above the vibrating spring is detachably installed on the expansion block, and a card slot is provided in the middle of the positioning block.

[0012] Furthermore, a raised handle is provided on the side of the expansion block.

[0013] Furthermore, two slide grooves perpendicular to the vibrating springs in the horizontal direction are provided on the upper end of the expansion block, and two sliders matching the slide grooves are provided on the positioning block. A scale is provided on the expansion block along the extension direction of the slide grooves.

[0014] Furthermore, an opening is provided on one side of the card slot. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0016] Figure 2 Schematic diagram of the sensor installation structure.

[0017] In the above drawings: 1. bracket; 2. long part; 3. short part; 4. middle convex block; 5. outer edge block; 6. stud; 7. push rod; 8. mounting column; 9. handle; 10. distance measuring bar; 11. expansion block; 12. positioning block; 13. slot; 14. sensor; 15. pull handle; 16. slide groove; 17. slider; 18. signal line; 19. top block. DETAILED DESCRIPTION

[0018] The technical solution of the present invention is further described below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, an embodiment of the utility model proposes a test fixture for random vibration experiments, including: a bracket 1 and a vibration spring, the top of the bracket 1 is provided with a mounting position for the vibration spring, and corresponding longitudinal clamping devices and transverse clamping devices are provided around the mounting position; wherein, the vibration spring includes a short portion 3 and a long portion 2, the short portion 3 is used to be installed at the mounting position, the short portion 3 is longitudinally clamped by the longitudinal clamping device in the vertical direction, and is clamped by two transverse clamping devices in the horizontal direction, the long portion 2 extends horizontally forward, and the long portion 2 is used to install a sensor 14 that transmits a vibration signal.

[0020] By reserving an installation position on the bracket 1, two lateral clamping devices are set on both sides of the installation position on the top of the bracket 1. The two lateral clamping devices clamp the vibration spring from both sides of the short part 3 of the vibration spring, and the lateral clamping device presses the vibration spring from the top of the short part 3 of the vibration spring, thereby achieving the fixation of the vibration spring and preventing the vibration spring from being offset due to human error in the process of knocking the vibration spring, which ultimately leads to abnormal feedback signals from the sensor 14 and affects the collection of experimental data.

[0021] The bracket 1 is specifically a rectangular frame; at least one first screw hole is provided at the lower end of the rectangular frame; the specific bracket 1 is set as a rectangular frame, which has a stable structure, uses less materials, is low in cost and is easy to process. At the same time, by providing the first screw hole, it is convenient to fix the bracket 1 to the vibration test table by bolts. Specifically, multiple fourth screw holes can be provided above the vibration test table, which are more convenient to use with each other.

[0022] The mounting position is arranged at the center of the top of the bracket 1 and close to the edge. There is a gap between the mounting position and the two lateral pressing devices in the left and right directions. A middle protrusion 4 is arranged on the top of the bracket 1 and located at the rear side of the mounting position.

[0023] Specifically, after the short part 3 of the vibration spring is limited to the installation position, the long part 2 can be suspended in the front side, so that the experimenter can use a hammer to hit the long part 2 to make it vibrate and collect vibration data; the installation position is centered to minimize the influence of the structure of the bracket 1 body on the vibration effect of the vibration spring and minimize other errors; there is a gap between the installation position and the two horizontal clamping devices in the left and right directions, which is convenient for installing and replacing vibration springs of different widths; the short part 3 is limited at the back side by the middle protrusion 4, which can ensure that the length of the abutment of the upper end of the short part 3 is constant, thereby improving the fixing stability of the upper end of the short part 3.

[0024] like Figure 1 As shown, the longitudinal clamping device includes: an outer edge block 5 and a stud 6, the outer edge block 5 is fixed to the side wall of the middle protrusion 4, the outer edge block 5 is located directly above the installation position, the short part 3 of the vibration spring is inserted into the installation position, and a second screw hole for the stud 6 to pass through is provided on the short part 3, and a third screw hole for the stud 6 to be inserted is provided at the installation position.

[0025] The two lateral clamping devices both include: a push rod 7 and a mounting column 8, the push rod 7 passes through the mounting column 8 horizontally, and the push rod 7 is threadedly connected to the mounting column 8; the two mounting columns 8 are arranged opposite to each other in the horizontal direction, and the opposite sides of the two push rods 7 are provided with a top block 19, the two top blocks 19 are used to press against the two side walls of the short portion 3, and the ends of the two push rods 7 are provided with a handle 9, which makes it easy to rotate the push rod 7, so that the two push rods 7 drive the two top blocks 19 to move closer to or away from each other, thereby achieving the clamping or release of the vibrating spring.

[0026] Furthermore, Figure 1 as well as Figure 2 As shown, it also includes a ranging bar 10. A horizontal square hole is provided on the bracket 1. The ranging bar 10 is embedded in the square hole to achieve a sliding connection. A scale is provided on the ranging bar 10. An expansion block 11 is provided at the end of the ranging bar 10. A positioning block 12 located directly above the vibrating spring is detachably mounted on the expansion block 11, and a card slot 13 is provided in the middle of the positioning block 12.

[0027] Specifically, slide the distance measuring bar 10 back and forth, and determine the position of the expansion block 11 by observing the scale. After determining it, glue the bottom of the sensor 14 with glue, align it with the position of the card slot 13, and stick it down to the upper surface of the vibrating spring to complete the installation; in order to facilitate pushing the expansion block 11, a raised pull handle 15 is provided on the side of the expansion block 11.

[0028] Two slide grooves 16 are provided at the upper end of the expansion block 11 and are perpendicular to the vibrating spring piece in the horizontal direction. Two sliders 17 matching the slide grooves 16 are provided on the positioning block 12. The sliders 17 slide in the slide grooves 16 along the extension direction of the slide grooves 16, thereby realizing the distance adjustment of the positioning block 12 in the direction perpendicular to the vibrating spring piece. A scale is provided on the expansion block 11 for the user to observe the distance adjustment amplitude of the positioning block 12.

[0029] Through the above method, the installation position of the sensor 14 can be adjusted in the horizontal and vertical directions relative to the vibrating spring, thereby improving the accuracy of detection.

[0030] Furthermore, the positioning block 12 has a variety of specifications; the styles of the card slots 13 on positioning blocks 12 of different specifications are different, so that they can be suitable for installing and fitting sensors 14 of different shapes; they can be assembled into the slide groove 16 from top to bottom through the slider 17 to form a detachable connection; an opening is provided on one side of the card slot 13, and the opening can facilitate the signal line 18 of the sensor 14 to pass through, making the installation of the sensor 14 more convenient.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A test fixture for random vibration experiments, characterized in that: include: A bracket (1) and a vibrating spring, wherein a mounting position for the vibrating spring is provided on the top of the bracket (1), and corresponding longitudinal pressing devices and transverse pressing devices are provided around the mounting position; The vibration spring comprises a short portion (3) and a long portion (2), the short portion (3) being used for installation at the installation position, the short portion (3) being longitudinally compressed by a longitudinal compression device in the vertical direction and being clamped by two transverse compression devices in the horizontal direction, the long portion (2) extending horizontally forward, and the long portion (2) being used for installing a sensor (14) for transmitting a vibration signal.

2. A test fixture for random vibration experiment according to claim 1, characterized in that: The bracket (1) is specifically a rectangular frame; at least one first screw hole is provided at the lower end of the rectangular frame.

3. A test fixture for random vibration experiment according to claim 1, characterized in that: The installation position is arranged at the center of the top of the bracket (1) and close to the edge, and a gap is left between the installation position and the two transverse pressing devices in the left and right directions. A middle protrusion (4) is arranged on the top of the bracket (1) and located at the rear side of the installation position.

4. A test fixture for random vibration experiment according to claim 3, characterized in that: The longitudinal pressing device comprises: an outer edge block (5) and a stud (6); the outer edge block (5) is fixed to the side wall of the middle convex block (4); the outer edge block (5) is located directly above the installation position; the short portion (3) of the vibration spring is inserted into the installation position; a second screw hole for the stud (6) to pass through is provided on the short portion (3); and a third screw hole for the stud (6) to be inserted is provided at the installation position.

5. A test fixture for random vibration experiment according to any one of claims 1 to 4, characterized in that: The two transverse pressing devices each comprise: a push rod (7) and a mounting column (8), wherein the push rod (7) passes through the mounting column (8) horizontally, and the push rod (7) and the mounting column (8) are threadedly connected; the two mounting columns (8) are arranged opposite to each other in the horizontal direction, and opposite sides of the two push rods (7) are provided with a top block (19), and the two top blocks (19) are used to press against the two side walls of the short portion (3).

6. A test fixture for random vibration experiment according to claim 1, characterized in that: The invention also comprises a distance measuring bar (10), wherein the bracket (1) is provided with a horizontal square hole, the distance measuring bar (10) is embedded in the square hole to realize sliding connection, the distance measuring bar (10) is provided with a scale, an expansion block (11) is provided at the end of the distance measuring bar (10), a positioning block (12) located directly above the vibrating spring is detachably mounted on the expansion block (11), and a card slot (13) is provided in the middle of the positioning block (12).

7. A test fixture for random vibration experiment according to claim 6, characterized in that: A raised handle (15) is provided on the side of the enlarged block (11).

8. A test fixture for random vibration experiment according to claim 6, characterized in that: The upper end of the enlargement block (11) is provided with two slide grooves (16) which are perpendicular to the vibrating spring in the horizontal direction, and the positioning block (12) is provided with two sliders (17) which match the slide grooves (16). A scale is provided on the enlargement block (11) along the extension direction of the slide grooves (16).

9. A test fixture for random vibration experiment according to claim 6, characterized in that: One side of the card slot (13) is provided with an opening.

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