Salt spray test device

Abstract

The utility model provides a salt spray test device, which comprises an experimental platform, a sealing device, a spraying device and a control device, and is characterized in that the experimental platform is used for placing a device to be tested; the bottom of the sealing device is in sealing connection with the experiment platform, and a closed experiment space is defined by the side wall and the top surface of the experiment platform; the spraying device comprises a gas conveying device and a gas spraying device which are connected through a pipeline, and the gas spraying device is arranged in the test space; and the control device is in electric connection or signal connection with the spraying device and controls the concentration of the salt mist gas in the test space by controlling the gas transmission amount of the spraying device. According to the salt spray test device provided by the utility model, the gas concentration in the test process is ensured by controlling quantitative input of salt spray gas into the closed test space, so that the working efficiency in the test process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of salt spray test equipment, in particular to a salt spray test device capable of controlling the salt spray concentration. Background Art

[0002] Fretting wear refers to a composite form of wear generated between mutually pressed metal surfaces due to small-amplitude vibrations. Fretting fatigue widely exists in various daily and engineering fields, such as aviation, aerospace, railway, machinery, electrics, medical engineering, nuclear power, etc., and it is increasingly becoming the main cause of the failure of key components.

[0003] When a train is running, it is basically exposed to the atmospheric environment, so environmental corrosion greatly affects the service life of the train. In practical applications, acid rain or salt spray corrosion environments generate corrosion pits on the non-painted surfaces of vehicles or the surfaces where the protective paint has peeled off, and extremely small relative displacements occur at the mating parts of components, thereby generating fretting wear phenomena and significantly reducing the service life of train components.

[0004] To avoid the fretting wear caused by such environmental corrosion, it is necessary to conduct a salt spray test on the components in advance to verify the corrosion resistance of the components. In the existing on-line salt spray test devices, there are problems that the salt spray concentration cannot be guaranteed during the test process, and the test devices are complex and costly, which is not conducive to operation and popularization. Summary of the Utility Model

[0005] The main purpose of the utility model is to solve the above problems and deficiencies, and provide a salt spray test device, which can ensure the gas concentration problem during the test process by controlling the quantitative input of salt spray gas into a closed test space, thereby improving the working efficiency of the test process.

[0006] To achieve the purpose of the utility model, the utility model provides a salt spray test device, and adopts the following technical solutions:

[0007] A salt spray test device, characterized in that it includes an experimental platform, a sealing device, a spraying device and a control device, wherein,

[0008] The experimental platform is used for placing the devices to be tested;

[0009] The sealing device is hermetically connected to the bottom of the experimental platform, and its side wall and the top surface of the experimental platform enclose a closed test space;

[0010] The spraying device includes an air delivery device and a jet device connected by a pipeline, and the jet device is arranged in the test space;

[0011] The control device is electrically connected or signal-connected to the spraying device, and controls the salt spray gas concentration in the test space by controlling the air delivery volume of the spraying device.

[0012] Further, the control device includes a humidity sensor disposed in the test space and a controller disposed outside the sealing device, and the humidity sensor is electrically connected or signal-connected to the controller.

[0013] Further, a heat preservation layer is attached to the outside of the sealing device.

[0014] Further, a temperature sensor electrically connected or signal-connected to the control device is disposed at the heat preservation layer.

[0015] Further, the sealing device includes a sealing cover that encloses the test space, and the bottom of the sealing cover is hermetically connected to the experimental platform through a first sealing member.

[0016] Further, the sealing cover includes a cylindrical lower sealing cover and a conical upper sealing cover.

[0017] Further, the first sealing member is a U-shaped groove, and the bottom of the sealing cover is inserted into the groove body of the U-shaped groove.

[0018] Further, the U-shaped groove is filled with a liquid that functions as a liquid seal.

[0019] Further, a notch for liquid circulation is formed at the bottom of the sealing cover.

[0020] Further, an opening for discharging the liquid is provided on the U-shaped groove.

[0021] In summary, a salt spray test device provided by the present utility model has the following technical advantages compared with the prior art:

[0022] 1. The gas concentration inside the sealing cover is collected by a sensor and then the gas supply state of the gas supply device is controlled by the controller, so that the gas concentration inside the sealing cover can be strictly controlled.

[0023] 2. By controlling the salt spray gas concentration inside the sealing cover, the influence caused by the concentration change during the test work is overcome, thereby ensuring the work efficiency and the quality of the salt spray test.

[0024] 3. The overall structure is simple, the installation is simple, and the use is convenient, further increasing the work efficiency.

[0025] 4. The liquid is filled in the sealing groove, and the gas is prevented from escaping along the bottom of the sealing cover by means of liquid seal, further ensuring the gas concentration inside the sealing cover. Description of the Drawings

[0026] Figure 1 : Schematic diagram of the composition of a salt spray test device provided by the present utility model;

[0027] Figure 2 : Partial sectional view of the sealing device structure in a salt spray test device provided by the present utility model;

[0028] Among them, 1, gas transmission device; 2, controller; 3, humidity sensor; 4, jet nozzle; 5, device to be tested; 6, sealing cover; 61, conical upper sealing cover; 62, cylindrical lower sealing cover; 7, U-shaped groove; 8, experimental platform.

[0029] It should be noted that these drawings and textual descriptions are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Specific embodiments

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0031] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0032] In the description of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0033] The following further describes the present utility model in detail in conjunction with the drawings and specific embodiments.

[0034] The present utility model provides a salt spray test device, including an experimental platform 8, a sealing device, a spraying device, and a control device, where:

[0035] The experimental platform 8 is used to place the device to be tested 5;

[0036] The sealing device is hermetically connected to the experimental platform 8 at the bottom, and the main structure and the top surface of the experimental platform enclose a closed test space;

[0037] A spray device, comprising a gas delivery device 1 and a jet device connected by a pipeline, and the jet device is arranged in a test space 1;

[0038] A control device, electrically connected or signal-connected to the spray device, controls the concentration of salt spray gas in the test space by controlling the gas delivery volume of the spray device.

[0039] As Figure 1 shown, a salt spray test device provided by the present utility model comprises an experimental platform 8 and a sealing device. The experimental platform comprises a plurality of columns supporting the tabletop, and the top surface of the tabletop is subjected to anti-corrosion treatment. The device to be tested 5 is directly placed on the tabletop, or a mounting seat to be corroded is further placed on the tabletop, and the device to be tested 5 is placed on the mounting seat. The structural form of the mounting seat is not limited, as long as the contact points between the mounting seat and the device to be tested 5 can be avoided from forming a test blind area, and there are no requirements and restrictions.

[0040] The sealing device is placed on the tabletop, and the bottom is in sealed contact with the tabletop, so that the main structure of the sealing device and the tabletop enclose a closed test space, and the device to be tested 5 is placed in this test space.

[0041] In this embodiment, the sealing device comprises a sealing cover 6. The bottom of the sealing cover 6 is in sealed connection with the tabletop, and comprises a cylindrical lower sealing cover 62 and a conical upper sealing cover 61. The cylindrical lower sealing cover 62 is a cylindrical structure, and the outer diameter (diameter) is smaller than the shortest side length of the tabletop. In practical applications, the cylindrical lower sealing cover 62 can be a hollow structure of any shape, including but not limited to a hollow structure with a rectangular or polygonal cross-section and a hollow structure with an irregular main structure. The bottom is in sealed connection with the tabletop, and the top is in sealed connection with the conical upper sealing cover 61.

[0042] The bottom shape and size of the conical upper sealing cover 61 are the same as the top shape and size of the cylindrical lower sealing cover 62, and are in sealed connection with the top of the cylindrical lower sealing cover 62, so that the sealing cover 6 forms a semi-sealed structure with an open bottom. In practical applications, the conical upper sealing cover 61 may not be provided either, and the top of the cylindrical lower sealing cover 62 is sealed by a plate-like structure.

[0043] The inner part of the sealing cover 6 is subjected to anti-corrosion treatment to prevent the salt spray gas from corroding and damaging the sealing cover during the test.

[0044] A sealing ring is arranged at the bottom of the sealing cover 6, so that the sealing cover 6 is in sealed connection with the tabletop, preventing the salt spray gas from escaping from the connection between the sealing cover 6 and the tabletop, resulting in a change in the gas concentration in the test space.

[0045] In this embodiment, the sealing device further comprises a U-shaped groove 7, as Figure 1 and Figure 2As shown, the opening of the U-shaped groove 7 faces upward, and the bottom of the groove is hermetically connected to the tabletop. For example, the U-shaped groove 7 can be integrally formed with the tabletop, or hermetically connected to the tabletop by gluing or setting a sealing ring to prevent salt mist gas from escaping at the connection between the U-shaped groove 7 and the tabletop.

[0046] The shape of the U-shaped groove 7 is the same as the shape of the bottom of the cylindrical lower sealing cover 61. For example, the U-shaped groove 7 encloses a sealed circular structure, the width of the groove body is greater than or equal to the wall thickness of the sealing cover 61, and the bottom of the cylindrical lower sealing cover 61 is inserted into the groove body of the U-shaped groove 7.

[0047] The U-shaped groove 7 is fixed on the tabletop. As described above, the U-shaped groove 7 is integrally formed with the tabletop. On the one hand, the U-shaped groove 7 can limit the position of the sealing cover 6 on the tabletop and play a role in limiting and positioning. On the other hand, by setting the U-shaped groove, the gas escape path changes from a straight line to a multi-segment bent path, that is, a labyrinth path, increasing the running resistance, reducing the leakage, and a sealing ring can be added to the bottom of the U-shaped groove 7 to make the sealing cover 6 hermetically connected to the U-shaped groove 7, further reducing the gas leakage.

[0048] In this embodiment, liquid can be added to the U-shaped groove 7 to form a liquid seal between the sealing cover 6 and the U-shaped groove 7, effectively preventing salt mist gas from escaping.

[0049] At the bottom of the sealing cover 6, a plurality of notches are provided. The plurality of notches are arranged at intervals and play a role in communication, enabling the liquid to flow inside and outside the sealing cover 6 within the range of the groove body of the U-shaped groove 7 through the notches. The liquid levels inside and outside the sealing cover 6 are the same, playing a good liquid seal role.

[0050] At the bottom of the U-shaped groove 7, an opening is provided. The opening is usually sealed. Liquid for liquid seal can be injected into the U-shaped groove 7 through the opening, and after the salt spray test is completed, the liquid can be discharged through the opening.

[0051] Preferably, the liquid can be the liquid condensed in the U-shaped groove 7 when the concentration of the salt mist gas is too high, or directly a saturated liquid with the same ratio as the salt mist gas, to avoid the liquid absorbing the salt mist gas in the test space and affecting the concentration of the salt mist gas in the test space.

[0052] In practical applications, the liquid playing the role of liquid seal can be arbitrarily selected as long as it does not cause fluctuations in the concentration of the salt mist gas in the test space, and there are no restrictions or requirements.

[0053] As described above, the bottom of the sealing cover 6 can be hermetically connected to the tabletop (experimental platform) through a sealing ring, the U-shaped groove 7, a sealing ring provided in the U-shaped groove 7, a liquid for liquid seal provided in the U-shaped groove, etc. In practical applications, the bottom of the sealing cover 6 is hermetically connected to the tabletop (experimental platform) through a first sealing member. The first sealing member includes but is not limited to the above-mentioned sealing structures (methods), and any structure (method) that can play a sealing role is acceptable.

[0054] The salt spray test device described in this utility model further includes a spraying device, such as Figure 1 shown. The spraying device includes a gas transmission device 1 and a gas jetting device. The gas transmission device 1 is placed outside the sealing device, and the gas jetting device is arranged in the test space enclosed by the sealing device, and they are connected to each other through pipelines.

[0055] In this embodiment, the gas jetting device adopts a gas jetting nozzle 4 that can uniformly spray salt spray gas. At the center position of the top of the conical sealing cover 61, there is a through hole. The pipeline is inserted into the test space from the through hole and connected to the gas jetting nozzle 4 to supply salt spray gas with a certain pressure to the gas jetting nozzle 4. A sealing ring is arranged at the through hole to prevent the salt spray gas in the test space from escaping from the gap between the through hole and the pipeline.

[0056] Preferably, at the center position of the top of the conical sealing cover 61, there is a connecting pipe. The connecting pipe is integrally formed with or fixedly sealed to the conical sealing cover 61. The top of the connecting pipe penetrates through the top surface of the conical sealing cover 61 or is flush with the top surface of the conical sealing cover 61. The pipeline is hermetically connected to the connecting pipe in a plugging manner or hermetically connected in any other way. The bottom of the connecting pipe is connected to the air inlet of the gas jetting nozzle 4.

[0057] On the bottom surface of the gas jetting nozzle 4, that is, the surface facing the experimental flat 5, a plurality of spray heads are evenly arranged, and the salt spray gas enters the test space in the form of ultrafine gas.

[0058] The gas transmission device 1 can transport salt spray gas with a stable pressure into the test space, and the gas transmission volume of the gas transmission device 1 is controlled by a control device to meet the test requirements.

[0059] The control device includes a controller arranged outside the sealing device. The controller includes an input module. Through the input module, test data for this test is input, including but not limited to gas consumption, test time, specific parameters of the device 5 to be tested, gas transmission parameters of the gas transmission device 1. The test data can be input in an online input manner or in an imported mode.

[0060] The controller is electrically connected or signal-connected to the gas transmission device 1. According to the collected gas consumption and gas transmission parameters of the gas transmission device 1, the gas transmission time and gas transmission volume of the gas transmission device are controlled to control the concentration of salt spray gas in the test space.

[0061] Controlling the gas transmission volume of the gas transmission device by the controller is a conventional technology in the art. Any existing or potentially emerging technology that can achieve quantitative transmission of salt spray gas volume is applicable to this utility model. This part is not the key point of the utility model of this utility model and will not be elaborated here.

[0062] Further, the salt fog gas concentration can be reflected as humidity data. Therefore, in this embodiment, the control device further includes a humidity sensor 3, which is disposed in the test space and electrically connected or signal-connected to the controller. The humidity sensor 3 is disposed on the upper part of the side wall of the columnar lower sealing cover 62.

[0063] Preferably, as Figure 1 shown, the horizontal median plane of the jet nozzle 4 is flush with the top surface of the columnar lower sealing cover 62, and the top of the humidity sensor 3 is flush with the horizontal median plane of the jet nozzle 4 to detect the salt fog gas concentration in the upper space of the test space and ensure that the salt fog concentration in the overall space can meet the test requirements.

[0064] The humidity sensor 3 detects the salt fog gas concentration in the test space in real time or at regular intervals to avoid the reduction of the salt fog gas concentration in the test space after the salt fog gas liquefies on the surface of the device and condenses into liquid. Seriously, it may be reduced below the test requirement standard.

[0065] Multiple consecutive humidity intervals are pre-stored in the controller 2, and each interval corresponds to the gas delivery volume or gas delivery time of a gas delivery device. The salt fog gas concentration under the test standard corresponds to one of the humidity intervals. According to the test requirements, after the gas delivery device 1 completes gas delivery, the humidity sensor 3 detects the humidity in the test space, and determines whether to adjust the salt fog gas concentration in the test space according to the current humidity interval.

[0066] In the initial state, the salt fog gas concentration in the test space should be the standard concentration required by the test. During the test, due to the continuous contact, liquefaction, and corrosion of the salt fog gas with the device 5 to be tested, the concentration may decrease. When the salt fog gas concentration in the test space fluctuates and the humidity changes, and the current humidity interval changes, the controller controls the gas delivery device 1 to act again according to the current humidity interval where it is located, and quantitatively replenishes the salt fog gas into the test space to maintain the salt fog gas concentration in the test space. It should be noted that the humidity interval, where each interval corresponds to the gas delivery volume or gas delivery time of a gas delivery device, refers to the gas replenishment volume and gas replenishment time, rather than the gas delivery volume and gas delivery time of the entire gas delivery process.

[0067] Further, the salt fog test has temperature requirements. Therefore, an insulating layer (not shown in the figure) is also attached to the outside of the sealing cover 6 to maintain the temperature in the test space and avoid the liquefaction of the salt fog gas due to the reduction of the temperature in the test space, resulting in the reduction of the salt fog gas concentration in the test space.

[0068] Further, a temperature sensor is provided at the thermal insulation layer. The temperature sensor is electrically connected or signal-connected to the controller, and sends the detected temperature data to the controller in real time or at regular intervals. In the correspondence table of the humidity range and the gas transmission volume or gas transmission time pre-stored in the controller, real-time temperature data is also included. At different temperatures, for the same humidity range, there may be differences in the gas transmission volume or gas transmission time.

[0069] A salt spray test device provided by the present utility model greatly reduces the concentration fluctuation caused by the escape of salt spray gas in the test space by sealing the connection between the sealing cover 6 and the tabletop and the sealing connection between the gas transmission device and the sealing cover 6, and converts the salt spray gas concentration into humidity data, and uses the humidity sensor 3 to detect the humidity in the test space in real time to supplement the salt spray gas in time, further avoiding the problem of the fluctuation of the salt spray gas concentration with the test process.

[0070] In summary, a salt spray test device provided by the present utility model has the following technical advantages compared with the prior art:

[0071] 1. The gas concentration inside the sealing cover is collected by a sensor, and then the gas transmission state of the gas transmission device is controlled by the controller, so that the gas concentration inside the sealing cover can be strictly controlled;

[0072] 2. By controlling the salt spray gas concentration inside the sealing cover, the influence caused by the concentration change in the test work is overcome, thereby ensuring the work efficiency and the quality of the salt spray test;

[0073] 3. The overall structure is simple, the installation is simple, and the use is convenient, further increasing the work efficiency;

[0074] 4. The liquid is filled in the sealing groove, and in the way of liquid seal, the gas is prevented from escaping along the bottom of the sealing cover, further ensuring the gas concentration inside the sealing cover.

[0075] As described above, similar technical solutions can be derived in combination with the given solution content. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A salt spray test device, characterized in that: It includes an experimental platform, a sealing device, a spraying device and a control device. Among them, The experimental platform is used to place the device to be tested; The sealing device is hermetically connected to the bottom of the experimental platform, and its main structure and the top surface of the experimental platform enclose a closed test space; The spraying device includes an air delivery device and a jet device connected through a pipeline, and the jet device is arranged in the test space; The control device is electrically connected or signal-connected to the spraying device, and controls the salt mist gas concentration in the test space by controlling the air delivery volume of the spraying device.

2. The salt spray test device according to claim 1, characterized in that: The control device includes a humidity sensor arranged in the test space and a controller arranged outside the sealing device, and the humidity sensor is electrically connected or signal-connected to the controller.

3. A salt spray test device according to claim 1, characterized in that: A heat preservation layer is attached to the outside of the sealing device.

4. A salt spray test device according to claim 3, characterized in that: A temperature sensor electrically connected or signal-connected to the control device is arranged at the heat preservation layer.

5. A salt spray test device according to any one of claims 1 to 4, characterized in that: The sealing device includes a sealing cover enclosing the test space, and the bottom of the sealing cover is hermetically connected to the experimental platform through a first sealing member.

6. The salt spray test device according to claim 5, characterized in that: The sealing cover includes a cylindrical lower sealing cover and a conical upper sealing cover.

7. The salt spray test device according to claim 5, characterized in that: The first sealing member is a U-shaped groove, and the bottom of the sealing cover is inserted into the groove body of the U-shaped groove.

8. The salt spray test device according to claim 7, characterized in that: The U-shaped groove is filled with a liquid that plays a role in liquid sealing.

9. The salt spray test device according to claim 8, characterized in that: A notch for liquid circulation is opened at the bottom of the sealing cover.

10. A salt spray test device according to claim 8, characterized in that: An opening for discharging liquid is arranged on the U-shaped groove.

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