Air bag shock absorber and method for controlling the distance

Abstract

The application provides an air bag shock isolation device and a distance control method, which comprises a base, an air spring, a device platform and an eddy current displacement sensor, the base is connected with the device platform through the air spring, a first support extending to the device platform is arranged on the base, a second support extending to the base is arranged on the device platform, the distance between the end points of the first support and the second support away from the fixed end is monitored by the eddy current displacement sensor, and the lengths of the first support and the second support are both greater than half of the distance between the base and the device platform. The air bag shock isolation device provided by the application has the advantages of simple structure, convenient installation, reduced equipment cost and saved equipment volume.

Description

Technical Field

[0001] This invention belongs to the technical field of ship vibration isolation devices, specifically relating to an airbag vibration isolation device and a spacing control method. Background Technology

[0002] The airbag vibration isolation device is located between the equipment platform and the base, and is mainly used to reduce the transmission of vibration from the power unit and equipment. The airbag vibration isolation device collects the pressure of the air spring and the relative displacement between the equipment platform and the base, and controls the inflation and deflation of the air spring to achieve the target height, thereby achieving functions such as load distribution and attitude control of the entire equipment platform.

[0003] Considering the harsh working conditions of ships, displacement acquisition in airbag vibration isolation devices typically uses eddy current sensors. The principle of an eddy current displacement sensor is to accurately measure the static and dynamic relative displacement changes between the measured metal plate and the probe end face based on the eddy current effect. The advantages of eddy current displacement sensors are long service life, high measurement accuracy, and good environmental adaptability. The disadvantages are that the measurement range is usually small, generally within 25mm; larger range sensors require custom customization. The closer the eddy current sensor is to its linear midpoint, the more accurate the measurement. The larger the measurement range of the eddy current sensor, the larger the size of the probe and the measured surface.

[0004] In existing vibration isolation devices, the probe of the eddy current displacement sensor is usually installed on the bottom surface of the equipment platform, and the metal plate being measured is fixed to the base by the bottom bracket. Figure 1 As shown, when the air spring is not inflated, the distance between the probe and the metal plate being tested is the smallest, about 10mm. A 10mm gap is left to ensure that there is a certain gap between the probe and the metal plate being tested when the air spring is not inflated, so that the probe, the metal plate and its support are not subjected to force and deformation is prevented. Figure 2 As shown, when the air spring is inflated to 15mm and reaches the target control height, the distance between the probe and the measured metal plate is approximately 25mm. The airbag vibration isolation device requires automatic attitude control accuracy within ±1mm of the target height. Therefore, an eddy current displacement sensor with a linear midpoint of approximately 25mm is suitable. However, the range of ordinary eddy current displacement sensors cannot meet the requirements of the airbag vibration isolation device, necessitating the customization of an ultra-large range eddy current displacement sensor. An eddy current displacement sensor with a range of 50mm and a linear midpoint of 30mm can meet the requirements, but this model has a probe φ100 and a minimum measured area φ180, resulting in a large installation volume and high procurement cost. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide an airbag vibration isolation device that is simple in structure, easy to install, and can reduce equipment costs and save equipment volume.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows: an airbag shock isolation device includes a base, an air spring, an equipment platform, and an eddy current displacement sensor. The base is connected to the equipment platform via the air spring. A first bracket extending towards the equipment platform is provided on the base, and a second bracket extending towards the base is provided on the equipment platform. The distance between the endpoints of the first and second brackets away from the fixed end is monitored by the eddy current displacement sensor. The lengths of both the first and second brackets are greater than half of the distance between the base and the equipment platform.

[0007] Preferably, the eddy current displacement sensor includes a metal plate to be measured and a probe. The metal plate to be measured is disposed on the side of the first bracket away from the fixed end, and the probe is disposed on the side of the second bracket away from the fixed end via a support rod. The distance between the metal plate to be measured and the equipment platform is smaller than the distance between the probe and the equipment platform.

[0008] Preferably, the probe is coaxially arranged with the metal plate being tested.

[0009] Preferably, the metal plate being tested is arranged parallel to the equipment platform.

[0010] Preferably, the first bracket is adjustable in length.

[0011] Preferably, the first bracket includes a first fixing sleeve, a first telescopic rod that can slide inside the first fixing sleeve, and a first locking screw for fixing the first telescopic rod on the first fixing sleeve.

[0012] Preferably, the second bracket is adjustable in length.

[0013] Preferably, the second bracket includes a second fixing sleeve, inside which is provided a slidable second telescopic rod, and on which is provided a second locking screw for fixing the second telescopic rod.

[0014] A method for controlling the spacing of the aforementioned airbag shock isolation device includes the following steps:

[0015] Device installation: Connect the two ends of the air spring to the base and the equipment platform respectively. The probe of the eddy current displacement sensor is fixed on the equipment platform through the second bracket. The metal plate of the eddy current displacement sensor is fixed on the base through the first bracket. The distance between the metal plate and the equipment platform is smaller than the distance between the probe and the equipment platform.

[0016] Calculate the adjustment stroke: When the air spring is not inflated, the distance between the probe and the metal plate being measured is the initial distance h. maxWhen the air spring is inflated to the target distance, the distance between the probe and the metal plate being measured is h0, where h0 is the linear midpoint of the eddy current displacement sensor. As the air spring inflates, the distance between the base and the equipment platform gradually increases, and the actual distance h between the probe and the metal plate being measured gradually decreases. The eddy current displacement sensor sends the collected actual distance h information to the control processor inside the air spring in real time. The control processor inside the air spring calculates the adjustment stroke Δh, which is equal to the difference between the actual distance h and the target distance h0, i.e., Δh = h - h0. Then, the information of the adjustment stroke Δh is transmitted to the intake solenoid valve or the exhaust solenoid valve.

[0017] Actual spacing adjustment: The air spring controls the opening of the intake solenoid valve or exhaust solenoid valve according to the information of the adjustment stroke △h, so as to inflate or deflate the air and realize the adjustment of the support height.

[0018] Preferably, in the actual spacing adjustment step, when Δh is greater than 0, the intake solenoid valve opens, the air spring continues to inflate, and the actual spacing h decreases the adjustment stroke |Δh|; when Δh is less than 0, the exhaust solenoid valve opens, the air spring deflates, and the actual spacing h increases the adjustment stroke |Δh|.

[0019] The beneficial effects of this invention are that, during use, as the air spring inflates, the distance between the base and the equipment platform gradually increases, and the actual distance collected by the eddy current displacement sensor gradually decreases; as the air spring deflates, the distance between the base and the equipment platform gradually decreases, and the actual distance collected by the eddy current displacement sensor gradually increases. By using the overlapping part of the first and second supports for reverse ranging, the measurement range can be reduced, solving the problem of insufficient measurement range of conventional eddy current displacement sensors. The structure is simple, the installation is convenient, and it can save equipment costs and reduce equipment size. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an air spring when it is not inflated in the prior art;

[0021] Figure 2 for Figure 1 The diagram shown illustrates the structure of the air spring when it is inflated to the target distance.

[0022] Figure 3 This is a schematic diagram of the structure of an air spring without inflation according to one embodiment of the present invention;

[0023] Figure 4 for Figure 1 The diagram shows the structure of the air spring when it is inflated to the target distance.

[0024] In the diagram, 1 is the base; 11 is the first support; 2 is the air spring; 3 is the equipment platform; 31 is the second support; 32 is the support rod; 41 is the metal plate being tested; and 42 is the probe. Detailed Implementation

[0025] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] Please refer to the following: Figure 3-4 The airbag shock isolation device provided in this embodiment includes a base 1, an air spring 2, an equipment platform 3, and an eddy current displacement sensor. The base 1 is connected to the equipment platform 3 through the air spring 2. A first support 11 extending to the equipment platform 3 is provided on the base 1, and a second support 31 extending to the base 1 is provided on the equipment platform 3. The distance between the endpoints of the first support 11 and the second support 31 away from the fixed end is monitored by the eddy current displacement sensor. The lengths of the first support 11 and the second support 31 are both greater than half of the distance between the base 1 and the equipment platform 3.

[0027] During use, as the air spring 2 inflates, the distance between the base 1 and the equipment platform 3 gradually increases, and the actual distance collected by the eddy current displacement sensor gradually decreases. As the air spring 2 deflates, the distance between the base 1 and the equipment platform 3 gradually decreases, and the actual distance collected by the eddy current displacement sensor gradually increases. By measuring the distance in reverse through the overlapping part of the first bracket 11 and the second bracket 31, the range can be reduced, solving the problem of insufficient range of conventional eddy current displacement sensors. The structure is simple, the installation is convenient, and it can save equipment costs and reduce the size of the equipment.

[0028] More specifically, the eddy current displacement sensor includes a metal plate 41 to be measured and a probe 42. The metal plate 41 to be measured is located on the side of the first bracket 11 away from the fixed end, and the probe 42 is located on the side of the second bracket 31 away from the fixed end via a support rod 32. The probe 42 and the metal plate 41 to be measured are coaxially arranged. Since the acquisition device of the eddy current displacement sensor is installed on the equipment platform 3, it is easier to wire the probe 42 if it is fixed on the equipment platform 3. It can be understood that it is also feasible to fix the probe 42 on the base 1 above and fix the metal plate 41 below on the equipment platform 3.

[0029] More specifically, the metal plate 41 to be measured is arranged parallel to the equipment platform 3 to ensure measurement accuracy.

[0030] More specifically, the length of the first bracket 11 and / or the second bracket 31 is adjustable; the height of the first bracket 11 and / or the second bracket 31 can be adjusted according to the different distances between the base 1 and the equipment platform 3 and the different linear midpoints of the eddy current displacement sensor in different usage scenarios. It has a wide range of applications and good prospects for promotion.

[0031] More specifically, the first bracket 11 and / or the second bracket 31 includes a fixed sleeve, a slidable telescopic rod is provided inside the fixed sleeve, and a locking screw for fixing the telescopic rod is provided on the sleeve. Loosen the locking screw, adjust the first bracket 11 and / or the second bracket 31 to the required length, and then tighten the locking screw to complete the adjustment. The structure is simple and the operation is convenient.

[0032] A spacing control method using the above airbag vibration isolation device includes the following steps:

[0033] Device installation: Connect both ends of the air spring ② to the base ① and the equipment platform ③ respectively. The probe 42 of the eddy current displacement sensor is fixed on the equipment platform ③ through the second bracket 31. The measured metal plate 41 of the eddy current displacement sensor is fixed on the base ① through the first bracket 11. The spacing between the measured metal plate 41 and the equipment platform ③ is less than the spacing between the probe 42 and the equipment platform ③.

[0034] Calculate the adjustment stroke: When the air spring ② is not inflated, the initial spacing between the base ① and the equipment platform ③ is L, the length of the first bracket 11 is m, the length of the second bracket 31 is n, and the sum of the length m of the first bracket 11 and the length n of the second bracket 31 is greater than the spacing L from the base ① to the equipment platform ③. At this time, the spacing between the probe 42 and the measured metal plate 41 is the initial spacing h max , h max <L < m + n < 2L. When the air spring ② is inflated to the target spacing, the distance between the probe 42 and the measured metal plate 41 is h0, and h0 is the linear midpoint of the eddy current displacement sensor. As the air spring ② is inflated, the spacing between the base ① and the equipment platform ③ gradually increases, and the actual spacing h between the probe 42 and the measured metal plate 41 gradually decreases. The collected actual spacing h is sent to the control processor in the air spring in real time. The control processor in the air spring calculates the adjustment stroke △h. The adjustment stroke △h is equal to the difference between the actual spacing h and the target spacing h0, that is, △h = h - h0. Then, the information of the adjustment stroke △h is transmitted to the air spring;

[0035] Actual spacing adjustment: The air spring adjusts the support height according to the information of the adjustment stroke △h. When △h > 0, the air spring ② continues to be inflated, and the actual spacing h decreases by the adjustment stroke |△h|; when △h < 0, the air spring ② deflates, and the actual spacing h increases by the adjustment stroke |△h|.

[0036] When the air spring 2 is not inflated, the initial distance L between the probe 42 and the metal plate 41 being measured is the farthest, approximately 30mm. When the air spring 2 is inflated by 15mm to reach the target distance, the distance h0 between the probe 42 and the metal plate 41 being measured is approximately 15mm. At this point, only a conventional eddy current displacement sensor with a linear midpoint of approximately 15mm needs to be selected. This model of eddy current displacement sensor has a probe φ50 and a minimum measured area φ100. Compared with a conventional eddy current displacement sensor with a linear range of 25mm and a customized eddy current displacement sensor with an ultra-large linear range of 50mm, the probe and measured object dimensions are reduced by nearly half. Therefore, the airbag vibration isolation device provided by this invention can save equipment costs and reduce the equipment volume by more than half.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air bag shock isolation device, characterized by: The device includes a base (1), an air spring (2), an equipment platform (3), and an eddy current displacement sensor. The base (1) is connected to the equipment platform (3) via the air spring (2). The base (1) has a first bracket (11) extending toward the equipment platform (3), and the equipment platform (3) has a second bracket (31) extending toward the base (1). The distance between the endpoints of the first bracket (11) and the second bracket (31) away from the fixed end is monitored by the eddy current displacement sensor. The lengths of the first bracket (11) and the second bracket (31) are both greater than half the distance between the base (1) and the equipment platform (3).

2. The air bag shock absorber of claim 1 wherein: The eddy current displacement sensor includes a metal plate (41) to be measured and a probe (42). The metal plate (41) to be measured is located on the side of the first support (11) away from the fixed end. The probe (42) is located on the side of the second support (31) away from the fixed end via a support rod (32). The distance between the metal plate (41) to be measured and the equipment platform (3) is smaller than the distance between the probe (42) and the equipment platform (3).

3. The airbag shock isolation device as described in claim 2, characterized in that: The probe (42) is coaxially arranged with the metal plate (41) being tested.

4. The air bag shock absorber of claim 2, wherein: The metal plate (41) being tested is set in parallel with the equipment platform (3).

5. The air bag shock absorber according to any one of claims 1 to 4, characterized in that: The first bracket (11) has an adjustable length.

6. The air bag shock absorber of claim 5 wherein: The first bracket (11) includes a first fixed sleeve, a first telescopic rod that can slide inside the first fixed sleeve, and a first locking screw for fixing the first telescopic rod on the first fixed sleeve.

7. The air bag shock absorber of claim 6 wherein: The second bracket (31) is adjustable in length.

8. The air bag shock absorber of claim 7 wherein: The second bracket (31) includes a second fixed sleeve, inside which is provided a slidable second telescopic rod, and on which is provided a second locking screw for fixing the second telescopic rod.

9. The method of controlling the spacing of an air bag shock absorber according to claim 1, wherein Includes the following steps: Device installation: Connect the two ends of the air spring to the base and the equipment platform respectively. The probe of the eddy current displacement sensor is fixed on the equipment platform through the second bracket. The metal plate of the eddy current displacement sensor is fixed on the base through the first bracket. The distance between the metal plate and the equipment platform is smaller than the distance between the probe and the equipment platform. Feedback adjustment stroke: When the air spring is not inflated, the distance between the probe and the metal plate being measured is the initial distance h. max As the air spring inflates, the distance between the base and the equipment platform gradually increases, and the actual distance h between the probe and the metal plate being measured gradually decreases. The eddy current displacement sensor sends the collected actual distance h information to the air spring in real time. The air spring calculates the adjustment stroke Δh, which is the difference between the actual distance h and the target distance h0. Then, the adjustment stroke Δh information is transmitted to the intake solenoid valve or the exhaust solenoid valve. Actual spacing adjustment: The air spring controls the opening of the intake solenoid valve or exhaust solenoid valve according to the information of the adjustment stroke △h, so as to inflate or deflate the air and realize the adjustment of the support height.

10. The method for controlling the interval of the air bag shock absorber according to claim 9, wherein: In the actual spacing adjustment step, when the adjustment stroke Δh is greater than 0, the intake solenoid valve opens, the air spring inflates, and the actual spacing h decreases by |Δh|. When the adjustment stroke Δh is less than 0, the exhaust solenoid valve opens, the air spring deflates, and the actual spacing h increases by |Δh|.

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