A pneumatic collision table height measuring device

Abstract

The present invention provides a pneumatic collision table height measuring device, which includes a tabletop, a table body, a driving cylinder and a sensor structure. The driving cylinder is arranged on the table body, the tabletop is arranged on the driving cylinder, the driving cylinder drives the tabletop to move up and down, and the sensor structure is fixedly connected to the moving part of the driving cylinder and moves up and down with the moving part of the driving cylinder. In the pneumatic collision table height measuring device of the present invention, compared with the prior art, the sensor is separated from the tabletop and rigidly connected to the moving part of the driving cylinder, so that the sensor moves together with the driving cylinder. Even if the tabletop rebounds, it will not interfere with the sensor, and the measured test data is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of pneumatic collision tables, and particularly to a height measuring device for a pneumatic collision table. Background Art

[0002] A pneumatic collision table is driven by a pneumatic method for collision. For example, a mechanical collision table is driven by a motor and a reducer; a pneumatic collision table is driven by a cylinder. Collision tables are mostly used for fatigue and reliability tests to simulate the working reliability and durability of equipment under special environments. For example, the reliability of a product under 80 collisions per minute, an acceleration value of 5g per collision, and continuous operation for 4 hours. A pneumatic collision table usually has a larger displacement than a mechanical collision table and can achieve a large acceleration value.

[0003] During the working process of a pneumatic collision table, when the acceleration value is relatively large, the height of the tabletop rises significantly, and there will be a rebound during the falling collision, resulting in a secondary collision. Sometimes, the secondary collision caused by the rebound of the tabletop will trigger the counter and be counted into the number of collisions; the height value of the rebound will also be counted by the photoelectric sensor, resulting in uneven collision times and inaccurate collision heights, sometimes high and sometimes low. The final result is that the test data is not accurate enough and the test waveform exceeds the tolerance.

[0004] The height measurement of a traditional pneumatic collision table usually uses a photoelectric sensor, which is fixed on the guide rod of the tabletop. The guide rod is rigidly connected to the tabletop, and the rise and fall of the tabletop will drive the photoelectric sensor to move together, and the height value is controlled accordingly. The height measurement device does not have a structure to eliminate the rebound of the tabletop. The photoelectric sensor will bounce with the tabletop. The sensor itself cannot identify which displacements are useful or useless, and the displacements generated by the rebound will be counted into the height of the next collision, resulting in an insufficient actual collision height value for the next time and affecting the accuracy of the collision test.

[0005] Therefore, how to solve the deficiencies existing in the above-mentioned prior art has become an urgent problem to be solved by the present invention. Summary of the Invention

[0006] The purpose of the present invention is to provide a height measuring device for a pneumatic collision table to solve the problems of inaccurate measurement results and poor stability of the height measuring device in the prior art.

[0007] To achieve the above purpose, the present invention provides a height measuring device for a pneumatic collision table, including a tabletop 1, a table body 2, a driving cylinder 3, and a sensor structure. The driving cylinder 3 is arranged on the table body 2, the tabletop 1 is arranged on the driving cylinder 3, the driving cylinder 3 drives the tabletop 1 to move up and down, and the sensor structure is fixedly connected to the moving part of the driving cylinder 3 and moves up and down with the moving part of the driving cylinder 3.

[0008] Further, the sensor structure includes a sensor 4, a sensor guide rod 5, and a guide rod fixing bracket 6. One end of the sensor guide rod 5 is connected to the sensor 4, and the other end is fixedly connected to the moving part of the driving cylinder 3 through the guide rod fixing bracket 6.

[0009] Further, the driving cylinder 3 includes a cylinder connector 7. The sensor guide rod 5 is fixedly connected to the cylinder connector 7 through the guide rod fixing bracket 6.

[0010] Further, the table body 2 includes a base 12 and a fixing plate 13 disposed above the base 12. The base 12 and the fixing plate 13 are fixedly connected by four columns 14.

[0011] Further, a second guide sleeve 15 is provided on the fixing plate 13. The sensor guide rod 5 is disposed in the second guide sleeve 15, and the sensor guide rod 5 moves up and down along the second guide sleeve 15.

[0012] Further, the pneumatic collision table height measuring device further includes an anti-tabletop rebound device, and the anti-tabletop rebound device is disposed on the table body 2.

[0013] Further, the anti-tabletop rebound device includes an air spring 8 and at least two tabletop guide rods 9. The upper surface of the air spring 8 is fixedly connected to the fixing plate 13 of the table body, the lower surface of the air spring 8 is fixedly connected to the lower ends of the tabletop guide rods 9, and the upper ends of the tabletop guide rods 9 are fixedly connected to the tabletop 1.

[0014] Further, the upper surface of the air spring 8 is fixedly connected to the fixing plate 13 of the table body through an air spring upper mounting plate 10, and the lower surface of the air spring 8 is fixedly connected to the lower ends of the tabletop guide rods 9 through an air spring lower mounting plate 11.

[0015] Further, the tabletop guide rods 9 are disposed on both sides of the air spring 8.

[0016] Further, a first guide sleeve 16 matching the tabletop guide rods 9 is further provided on the fixing plate 13. The tabletop guide rods 9 pass through the first guide sleeve 16 and move up and down along the first guide sleeve 16.

[0017] Advantages of the present invention:

[0018] For the pneumatic collision table height measuring device of the present invention, compared with the prior art, the sensor is separated from the tabletop and rigidly connected to the moving part of the driving cylinder, so that the sensor moves together with the driving cylinder. Even if the tabletop rebounds, it will not interfere with the sensor, and the measured test data is more accurate.

[0019] In addition, the present invention can also be equipped with a device for preventing the tabletop from rebounding on the table body. By arranging an air spring in the device for preventing the tabletop from rebounding, the air spring can apply a downward pressure to the tabletop when the tabletop descends, which can solve the problem of tabletop rebound, fundamentally eliminate its negative impact, improve the stability of the working performance of the product, greatly improve the accuracy of the working test data of the collision table, and make the test waveforms more standardized and unified. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the pneumatic collision table of the present invention;

[0021] Figure 2 is a schematic diagram of the sensor structure of the present invention;

[0022] Figure 3 is a schematic diagram of the device for preventing the tabletop from rebounding of the present invention;

[0023] Among them, 1. Tabletop, 2. Table body, 3. Driving cylinder, 4. Sensor, 5. Sensor guide rod, 6. Guide rod fixing bracket, 7. Cylinder connector, 8. Air spring, 9. Tabletop guide rod, 10. Upper mounting plate of air spring, 11. Lower mounting plate of air spring, 12. Base, 13. Fixing plate, 14. Column, 15. Second guide sleeve, 16. First guide sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, these embodiments do not limit the present invention, and any structural, method, or functional transformation made by those of ordinary skill in the art based on these embodiments is included in the protection scope of the present invention.

[0025] Spatial relative position terms used herein, such as "above", "upper", "below", "lower", etc., are for the purpose of facilitating description of the relationship between one unit or feature and another unit or feature as shown in the drawings. The spatial relative position terms are intended to include different orientations of the device in use or operation other than the orientation shown in the drawings. For example, if the device in the drawing is flipped, the unit described as being "below" or "beneath" other units or features will be "above" other units or features. Therefore, the exemplary term "below" can encompass both the upper and lower orientations. The device can be oriented in other ways (rotated 90 degrees or other orientations), and the spatially related descriptive terms used herein can be interpreted accordingly.

[0026] Also, it should be understood that although the terms first, second, etc. may be used herein to describe various elements or structures, the objects so described should not be limited by these terms. These terms are only used to distinguish these described objects from each other. For example, the first guide sleeve may be referred to as the second guide sleeve, and similarly the second guide sleeve may also be referred to as the first guide sleeve, which does not depart from the protection scope of the present application. The following embodiments further illustrate the technical solutions of the present invention.

[0027] Embodiment 1:

[0028] The present invention provides a pneumatic collision table height measuring device, as Figure 1 shown, which includes a tabletop 1, a table body 2, a driving cylinder 3 and a sensor structure. The table body 2 includes a base 12 and a fixing plate 13 arranged above the base 12. The base 12 and the fixing plate 13 are fixedly connected by four columns 14. The driving cylinder 3 is arranged on the table body 2. The tabletop 1 is arranged above the driving cylinder 3. The driving cylinder 3 drives the tabletop 1 to move up and down. The sensor structure is fixedly connected to the moving part of the driving cylinder 3 and moves up and down with the moving part of the driving cylinder 3.

[0029] Specifically, the sensor structure of the present invention, as Figure 2 shown, mainly consists of a sensor 4, a sensor guide rod 5, a second guide sleeve 15, a guide rod fixing bracket 6, a cylinder connector 7, etc. One end of the sensor guide rod 5 is connected to the sensor 4, and the other end is fixedly connected to the cylinder connector 7 on the driving cylinder 3 through the guide rod fixing bracket 6. The connection method can be a conventional connection method mastered by those skilled in the art. The second guide sleeve 15 of the present invention is arranged on the fixing plate 13. The sensor guide rod 5 passes through the second guide sleeve 15 and moves up and down along the second guide sleeve 15.

[0030] The present invention achieves a fixed connection between the sensor and the moving part of the driving cylinder through a series of rigid connectors, changes the fixed connection between the sensor and the tabletop in the traditional pneumatic collision table, disconnects the sensor from the tabletop, so that the tabletop does not affect the sensor counting when bouncing. The active stroke of the driving cylinder is the same as that of the tabletop, but when the driving cylinder moves up and down, it is controlled by a reversing valve, so the driving cylinder will not bounce when rising and falling. Therefore, establishing a fixed connection between the sensor and the moving part of the driving cylinder cleverly avoids the negative impact caused by the tabletop bounce, and the measured test data is more accurate.

[0031] Embodiment 2:

[0032] The pneumatic collision table height measuring device of the present invention includes a tabletop 1, a table body 2, a driving cylinder 3, a sensor structure, and a device for preventing the tabletop from rebounding. The table body 2 includes a base 12 and a fixing plate 13 arranged above the base 12. The base 12 and the fixing plate 13 are fixedly connected by four columns 14. The driving cylinder 3 is arranged on the table body 2, and the tabletop 1 is arranged above the driving cylinder 3. The driving cylinder 3 drives the tabletop 1 to move up and down. The sensor structure is fixedly connected to the moving part of the driving cylinder 3 and moves up and down with the moving part of the driving cylinder 3. Among them, the sensor structure is the same as that in Embodiment 1.

[0033] The device for preventing the tabletop from rebounding, such as Figure 3 shown, mainly consists of an air spring 8, a tabletop guide rod 9, a first guide sleeve 16, etc. The upper surface of the air spring 8 is fixedly connected to the fixing plate 13 through an air spring upper mounting plate 10, and the lower surface of the air spring 8 is fixedly connected to the lower end of the tabletop guide rod 9 through an air spring lower mounting plate 11. The upper end of the tabletop guide rod 9 is fixedly connected to the tabletop 1. A first guide sleeve 16 is also arranged outside the tabletop guide rod. The first guide sleeve 16 is fixedly installed on the fixing plate 13, and the tabletop guide rod 9 passes through the first guide sleeve 16 and moves up and down along the first guide sleeve 16.

[0034] In the embodiment of the present invention, the device for preventing the tabletop from rebounding may include a set of air springs 8 and two tabletop guide rods 9 arranged on both sides thereof; or it may include two sets of air springs 8, which are respectively arranged on opposite sides of the table body, and each set of air springs is fixedly connected to the tabletop guide rods on both sides thereof.

[0035] In the present invention, the air spring is installed in reverse and fixed to the table body and the tabletop guide rod through the mounting plate, establishing a rigid connection with the tabletop. In this way, the displacement of the tabletop will drive the air spring to compress, and conversely, the inflation and deflation of the air spring will affect the displacement of the tabletop. Its working principle is that during the rising process of the tabletop, the air spring is compressed, and at this time, no compressed air is added to the air spring, otherwise it will increase the resistance to the rising of the tabletop; when the tabletop starts to descend after reaching the predetermined height, compressed air is applied to the air spring, and the collision of the air spring drives the tabletop to fall rapidly. It is equivalent to applying an additional downward force to the tabletop when the tabletop falls. On the one hand, it can accelerate the falling speed of the tabletop and increase the number of collisions per minute. On the other hand, due to the existence of the downward force, the rebound jump of the tabletop will be suppressed, and no extra secondary collision will occur. When the tabletop is lifted again, the air spring stops supplying air and is in the exhaust state. The air intake and exhaust of the air spring are controlled by a reversing valve through a program, and it works in this cycle to form a periodic cooperation with the rising and falling of the tabletop, fundamentally eliminating the rebound phenomenon of the tabletop.

[0036] It should be noted that the above are only preferred embodiments for explaining the present invention, and are not intended to limit the present invention in any form. Therefore, any modification or change to the present invention made in the same inventive spirit should still be included within the scope intended to be protected by the present invention.

Claims

1. A pneumatic collision table height measuring device, comprising a tabletop (1), a table body (2), a driving cylinder (3) and a sensor structure. The driving cylinder (3) is arranged on the table body (2), the tabletop (1) is arranged on the driving cylinder (3), and the driving cylinder (3) drives the tabletop (1) to move up and down. It is characterized in that: The sensor structure is fixedly connected to the moving part of the driving cylinder (3) and moves up and down with the moving part of the driving cylinder (3). The sensor structure includes a sensor (4), a sensor guide rod (5) and a guide rod fixing bracket (6). One end of the sensor guide rod (5) is connected to the sensor (4), and the other end is fixedly connected to the moving part of the driving cylinder (3) through the guide rod fixing bracket (6). The driving cylinder (3) includes a cylinder connector (7), and the sensor guide rod (5) is fixedly connected to the cylinder connector (7) through the guide rod fixing bracket (6). The pneumatic collision table height measuring device further includes a device for preventing the tabletop from rebounding, and the device for preventing the tabletop from rebounding is arranged on the table body (2). The device for preventing the tabletop from rebounding includes an air spring (8) and at least two tabletop guide rods (9). The upper surface of the air spring (8) is fixedly connected to the fixing plate (13) of the table body, and the lower surface of the air spring (8) is fixedly connected to the lower ends of the tabletop guide rods (9). The upper ends of the tabletop guide rods (9) are fixedly connected to the tabletop (1). During the rising process of the tabletop (1), the air spring is compressed, and at this time, no compressed air is applied to the air spring (8). When the tabletop (1) starts to descend after reaching the predetermined height, compressed air is applied to the air spring (8).

2. The height measuring device of a pneumatic collision table according to any one of claim 1, characterized in that: The table body (2) includes a base (12) and a fixing plate (13) arranged above the base (12), and the base (12) and the fixing plate (13) are fixedly connected by four columns (14).

3. The height measuring device of a pneumatic collision table according to claim 2, characterized in that: A second guide sleeve (15) is arranged on the fixing plate (13), and a sensor guide rod (5) is arranged in the second guide sleeve (15), and the sensor guide rod (5) moves up and down along the second guide sleeve (15).

4. The height measuring device of a pneumatic collision table according to claim 1, characterized in that: The upper surface of the air spring (8) is fixedly connected to the fixing plate (13) through an air spring upper mounting plate (10), and the lower surface of the air spring (8) is fixedly connected to the lower ends of the tabletop guide rods (9) through an air spring lower mounting plate (11).

5. The height measuring device of a pneumatic collision table according to claim 1, characterized in that: The tabletop guide rods (9) are arranged on both sides of the air spring (8).

6. The height measuring device of a pneumatic collision table according to claim 1, characterized in that: The fixing plate (13) is further provided with a first guide sleeve (16) matching with the tabletop guide rods (9), and the tabletop guide rods (9) pass through the first guide sleeve (16) and move up and down along the first guide sleeve (16).

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