Water tank air tightness detection method and device

Abstract

The application provides a water tank air tightness detection method and device, the water tank air tightness detection method comprises the following steps: S1, after the external interface of the water tank to be detected is completely plugged, it is completely immersed in water; S2, after standing for a period of time, the buoyancy received by the water tank is measured and compared with the preset buoyancy value, if the measured buoyancy is less than the preset buoyancy value, the sealing property is poor, otherwise the sealing property is good.In the scheme, the buoyancy received by the water tank can be transmitted to the pressure detection element through the second connecting arm, if the air tightness of the water tank is good, the buoyancy it receives is larger, and the detection value of the pressure detection element is larger; if the air tightness of the water tank is poor, the buoyancy it receives is smaller, and the detection value of the pressure detection element is smaller, therefore the air tightness condition of the water tank can be directly judged by the detection value of the pressure detection element, without needing to additionally configure a gas supply system, the requirement for the detection device is lower, and the structure of the detection device is more simple.

Description

Technical Field

[0001] This invention relates to the field of water tank air tightness testing technology, and in particular to a method and equipment for testing the air tightness of water tanks. Background Technology

[0002] The water tank, also known as a radiator, is a key component of the trailer's cooling system. Its function is to dissipate heat. Cooling water absorbs heat in the water jacket, flows to the radiator where the heat is dissipated, and then returns to the water jacket for circulation, thus achieving temperature regulation. It is an integral part of the trailer's engine. Trailer water tanks are typically constructed by welding together sheet metal, and the airtightness of the water tank must be tested after welding.

[0003] The commonly used methods for airtightness testing are the bubble test and the pressure change method. The bubble test involves immersing the container in water and observing whether bubbles emerge, thus determining if the container is well-sealed. The pressure change method measures the pressure change inside the container to determine its airtightness; if the pressure change exceeds a certain range, it indicates a potential leak. Both methods require a corresponding air supply system, resulting in high requirements for the airtightness testing equipment and a relatively complex structure. Summary of the Invention

[0004] Based on the problems existing in the prior art, the present invention aims to solve the technical problem that both the bubble detection method and the pressure change method for detecting the air tightness of water tanks require a corresponding air supply system, which leads to high requirements for the air tightness detection device and a relatively complex device structure.

[0005] This invention provides a method for testing the airtightness of a water tank, comprising the following steps:

[0006] S1: After sealing all external interfaces of the water tank to be tested, completely immerse it in water;

[0007] S2: After standing for a period of time, measure the buoyancy of the water tank and compare it with the preset buoyancy value. If the measured buoyancy is less than the preset buoyancy value, the sealing is poor; otherwise, the sealing is good. The preset buoyancy value refers to the buoyancy of a well-sealed water tank when it is fully submerged in water.

[0008] According to an embodiment of the present invention, when the water tank to be tested is completely submerged in water in step S1, the method further includes:

[0009] The water tank needs to be placed at a certain depth, where the water pressure exceeds the air pressure inside the tank when the tank is submerged at that depth; and / or

[0010] Use an ultrasonic device to eliminate the effects of water tension.

[0011] The present invention also provides a water tank airtightness testing device, which includes a water tank and a robot. The water tank is filled with water, and the robot includes a gripper and a robotic arm fixedly connected. The gripper is configured to open and close to clamp or release the water tank. The robotic arm is configured to cooperate with the gripper to move the water tank to be tested into the water tank to a certain depth, and to remove the tested water tank from the water tank.

[0012] The robotic arm includes a first connecting arm, a second connecting arm, and a pressure detection element. The first connecting arm and the second connecting arm are movably connected so that the second connecting arm can move vertically relative to the first connecting arm. The end of the second connecting arm away from the first connecting arm is fixedly connected to the gripper. The pressure detection element is fixedly disposed on the first connecting arm and located above the second connecting arm, and is used to detect the buoyancy transmitted through the second connecting arm when the water tank is submerged in water.

[0013] According to one embodiment of the present invention, the first connecting arm is a sleeve with an opening at the bottom, the inner wall of the opening extending inward to form a stop portion; the second connecting arm is a T-shaped rod that matches the sleeve.

[0014] According to one embodiment of the present invention, the robotic arm further includes an elastic member disposed between the second connecting arm and the pressure detection element, for buffering the impact force of the second connecting arm on the pressure detection element.

[0015] According to an embodiment of the present invention, the water tank airtightness testing device further includes an ultrasonic device fixedly disposed on the side wall of the water tank. The ultrasonic device includes an ultrasonic generator fixedly disposed on the outer wall of the water tank and an ultrasonic transducer fixedly disposed on the inner wall of the water tank, wherein the ultrasonic generator and the ultrasonic transducer are electrically connected.

[0016] According to an embodiment of the present invention, the water tank airtightness testing device further includes a control module electrically connected to the pressure detection element, and a timing module and an alarm module electrically connected to the control module respectively. The control module is provided with a preset immersion time and a preset buoyancy value.

[0017] When the water tank is submerged to a certain depth, the timing module starts timing. When the preset submersion time is reached, the pressure detection element detects the buoyancy of the water tank transmitted by the second connecting arm and transmits it to the control module. The control module compares the received buoyancy with the preset buoyancy value and controls the alarm module to give different prompt information according to different comparison results.

[0018] The water tank airtightness testing method and equipment provided by this invention have the following beneficial effects:

[0019] In this solution, after the water tank is fully submerged in water for a period of time, the buoyancy of the water tank can be transmitted to the pressure detection element through the second connecting arm. If the water tank has good airtightness, the buoyancy it experiences is equal to the weight of the water displaced by the entire water tank (the weight of water equivalent to the volume of the water tank), and the detection value of the pressure detection element is large. If the water tank has poor airtightness, water will enter its interior, causing the buoyancy of the water tank to be only the weight of the water displaced by its sidewalls, and thus the detection value of the pressure detection element is small. Therefore, the airtightness of the water tank can be directly determined by the detection value of the pressure detection element. Compared with the existing technologies that use bubble detection method and pressure change method, which require a corresponding air supply system, this solution does not require an additional air supply system, has lower requirements for the detection device, and thus makes the structure of the detection device more streamlined. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments or prior art, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of a water tank in the prior art;

[0022] Figure 2 This is a cross-sectional view of a water tank airtightness testing device provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the connection structure of the pressure detection element, control module, timing module and alarm module in an embodiment of the present invention;

[0024] Reference numerals: 100-Water tank; 101-Water tank body; 102-Top cover; 103-Bottom cover; 104-External interface; 1-Water tank; 2-Robot; 21-Gripper; 22-Mechanical arm; 221-First connecting arm; 222-Second connecting arm; 223-Pressure detection element; 224-Elastic element; 3-Ultrasonic device; 31-Ultrasonic generator; 32-Ultrasonic transducer; 4-Control module; 5-Timing module; 6-Alarm module. Detailed Implementation

[0025] The following descriptions of the embodiments are made with reference to the accompanying illustrations to illustrate specific embodiments in which the invention can be implemented.

[0026] This invention provides a water tank airtightness testing device, wherein the structure of the water tank 100 is as follows: Figure 1As shown, it includes a water tank body 101 and a top cover 102 and a bottom cover 103 respectively welded and fixed to both ends of the water tank body 101. The top cover 102 also has an external interface 104 that communicates with the inner cavity of the water tank 100. This solution is used to detect the airtightness of the water tank body 101 after welding to the top cover 102 and the bottom cover 103. The structure of the water tank airtightness testing device is as follows: Figure 2 As shown, it includes a water tank 1 and a robot 2. The water tank 1 is filled with water. The robot 2 includes a gripper 21 and a robotic arm 22 that are fixedly connected. The gripper 21 is configured to open and close to clamp or release the water tank 100. The robotic arm 22 is configured to cooperate with the gripper 21 to move the water tank 100 to be tested into the water tank 1 to a certain depth, and to remove the tested water tank 100 from the water tank 1.

[0027] The robotic arm 22 includes a first connecting arm 221, a second connecting arm 222, and a pressure detection element 223. The first connecting arm 221 and the second connecting arm 222 are movably connected so that the second connecting arm 222 can move vertically relative to the first connecting arm 221. One end of the second connecting arm 222 away from the first connecting arm 221 is fixedly connected to the gripper 21. The pressure detection element 223 is fixedly disposed on the first connecting arm 221 and located above the second connecting arm 222, and is used to detect the buoyancy transmitted through the second connecting arm 222 when the water tank 100 is submerged in water.

[0028] In the water tank airtightness testing device provided by this invention, after the water tank 100 is completely submerged in water for a period of time, the buoyancy of the water tank 100 can be transmitted to the pressure detection element 223 through the second connecting arm 222. If the water tank 100 has good airtightness, the buoyancy it receives is equal to the weight of the water displaced by the entire water tank 100 (the weight of water equivalent to the volume of the water tank 100), and the detection value of the pressure detection element 223 is large. If the water tank 100 has poor airtightness, water will enter its interior, causing the buoyancy of the water tank 100 to be only the weight of the water displaced by its sidewalls, and thus the detection value of the pressure detection element 223 is small. Therefore, the airtightness of the water tank 100 can be directly judged by the detection value of the pressure detection element 223. Compared with the existing technology that uses bubble detection method and pressure change method, which requires a corresponding air supply system, this solution does not require an additional air supply system, has lower requirements for the detection device, and thus makes the structure of the detection device more concise.

[0029] Specifically, the first connecting arm 221 is a sleeve with an opening at the bottom, and the inner wall of the opening extends inward to form a stop; the second connecting arm 222 is a T-shaped rod that matches the sleeve.

[0030] Furthermore, the robotic arm 22 also includes an elastic element 224 disposed between the second connecting arm 222 and the pressure sensing element 223 to buffer the impact force of the second connecting arm 222 on the pressure sensing element 223. Specifically, the elastic element 224 can be either a spring or an elastic protective pad.

[0031] According to one embodiment of the present invention, in order to allow water to enter the poorly airtight water tank 100, when the water tank 100 is completely submerged in water, it needs to be placed at a certain depth. This certain depth refers to a depth at which the water pressure exceeds the air pressure inside the water tank 100; or

[0032] The water tank airtightness testing equipment also includes an ultrasonic device 3 fixedly installed on the side wall of the water tank 1. The ultrasonic device 3 includes an ultrasonic generator 31 fixedly installed on the outer wall of the water tank 1 and an ultrasonic transducer 32 fixedly installed on the inner wall of the water tank 1, wherein the ultrasonic generator 31 and the ultrasonic transducer 32 are electrically connected.

[0033] It is understandable that for a poorly airtight water tank 100, when the water pressure at its depth exceeds the air pressure inside, water can smoothly enter the tank 100. Simultaneously, the ultrasonic transducer 32 can disrupt the surface tension of the water, allowing water to enter the tank 100 through smaller pores on its surface, thus preventing the surface tension from affecting the detection process. It should be noted that limiting the depth of the water tank 100 in the water and using the ultrasonic device 3 to eliminate surface tension can be used individually or in combination, depending on the specific circumstances. Of course, using both methods together yields better results.

[0034] Please refer to Figure 3 According to an embodiment of the present invention, in order to achieve automation of the detection process, the water tank air tightness detection device further includes a control module 4 electrically connected to the pressure detection element 223, and a timing module 5 and an alarm module 6 electrically connected to the control module 4 respectively. The control module 4 is provided with a preset immersion time and a preset buoyancy value.

[0035] When the water tank 100 is submerged to a certain depth, the timing module 5 starts timing. When the preset submersion time is reached, the pressure detection element 223 detects the buoyancy force transmitted to the water tank 100 by the second connecting arm 222 and transmits it to the control module 4. The control module 4 compares the received buoyancy force with a preset buoyancy value and controls the alarm module 6 to provide different prompts based on different comparison results. Specifically, the alarm module 6 can be an alarm light that emits different colors of light based on different comparison results. For example, when the received buoyancy force is equal to the preset buoyancy value, the alarm light emits green light; when the received buoyancy force is less than the preset buoyancy value, the alarm light emits red light.

[0036] It should be noted that in actual operation, the influence of the weight of the water tank 100, the second connecting arm 222 and the gripper 21 on the detection result of the pressure detection element 223 needs to be considered. Therefore, the pressure or buoyancy actually detected by the pressure detection element 223 is the difference between the buoyancy of the water tank 100 and the weight of the water tank 100, the second connecting arm 222 and the gripper 21 and related components.

[0037] This invention provides a method for testing the airtightness of a water tank, comprising the following steps:

[0038] S1: After sealing all external interfaces of the water tank to be tested, completely immerse it in water;

[0039] When the water tank to be tested is completely submerged in water, it must be placed at a certain depth. This certain depth means that when the water tank is at that depth, the water pressure must exceed the air pressure inside the tank; and / or

[0040] Use an ultrasonic device to eliminate the effects of water tension.

[0041] S2: After standing for a period of time, measure the buoyancy of the water tank and compare it with the preset buoyancy value. If the measured buoyancy is less than the preset buoyancy value, the sealing is poor; otherwise, the sealing is good. The preset buoyancy value refers to the buoyancy of a well-sealed water tank when it is fully submerged in water.

[0042] To facilitate understanding of this solution, the following is combined with... Figures 1-3 The working principle of this invention will be explained in detail below:

[0043] First, completely seal all external interfaces 104 of the water tank 100 to be tested;

[0044] Next, the robot 2 is started, and the robotic arm 22, together with the gripper 21, places the water tank 100 to be tested into the water of the water tank 1 at a certain depth, and the ultrasonic device 3 is activated.

[0045] If the water tank 100 is left to stand for a period of time, and if the airtightness of the water tank 100 is good, the buoyancy it experiences is relatively large, which is equal to the weight of the water displaced by the entire water tank 100 (the weight of water with a volume equivalent to that of the water tank 100); if the airtightness of the water tank 100 is poor (there are pores in the side wall of the water tank 100), water will enter the interior of the water tank 100 through the pores and eventually fill the inner cavity of the water tank 100. At this time, the buoyancy experienced by the water tank 100 is relatively small, which is equal to the weight of the water displaced by the side wall of the water tank 100.

[0046] Next, the pressure detection element 223 detects the buoyancy transmitted from the water tank 100 through the second connecting arm 222 and the elastic element 224, and transmits the detected buoyancy to the control module 4. The control module 4 compares the received buoyancy with the preset buoyancy value, and controls the alarm module 6 to give different prompt information according to different comparison results.

[0047] In summary, the present invention provides a water tank airtightness testing method and device. By detecting the buoyancy of the water tank 100 after it is fully submerged in water and comparing it with the buoyancy value of a water tank 100 with good airtightness, the airtightness can be determined. Compared with the traditional bubble detection method and pressure change method, which require a corresponding air supply system, this solution does not require an additional air supply system and has lower requirements for the detection device, thus making the structure of the detection device more streamlined.

[0048] It should be noted that although the present invention has been disclosed above with specific embodiments, the above embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A water tank airtightness testing device, characterized in that, The system includes a water tank (100), a water trough (1), and a robot (2). The water tank (100) includes a water tank body (101) and a top cover (102) and a bottom cover (103) respectively welded and fixed to both ends of the water tank body (101). The top cover (102) is also fixedly provided with an external interface (104) that communicates with the inner cavity of the water tank (100). The water tank (1) is filled with water. The robot (2) includes a gripper (21) and a robotic arm (22) that are fixedly connected. The gripper (21) is configured to open and close to clamp or release the water tank (100). The robotic arm (22) is configured to cooperate with the gripper (21) to move the water tank (100) to be tested into the water tank (1) to a certain depth, and to remove the tested water tank (100) from the water tank (1). The robotic arm (22) includes a first connecting arm (221), a second connecting arm (222), and a pressure detection element (223). The first connecting arm (221) and the second connecting arm (222) are movably connected so that the second connecting arm (222) can move vertically relative to the first connecting arm (221). The end of the second connecting arm (222) away from the first connecting arm (221) is fixedly connected to the gripper (21). The pressure detection element (223) is fixedly disposed on the first connecting arm (221) and located above the second connecting arm (222) to detect the buoyancy transmitted through the second connecting arm (222) when the water tank (100) is submerged in water. It also includes an ultrasonic device (3) fixedly installed on the side wall of the water tank (1). The ultrasonic device (3) includes an ultrasonic generator (31) fixedly installed on the outer wall of the water tank (1) and an ultrasonic transducer (32) fixedly installed on the inner wall of the water tank (1). The ultrasonic generator (31) and the ultrasonic transducer (32) are electrically connected. It also includes a control module (4) electrically connected to the pressure detection element (223) and a timing module (5) and an alarm module (6) electrically connected to the control module (4), respectively. The control module (4) is equipped with a preset immersion time and a preset buoyancy value. When the water tank (100) is submerged to a certain depth, the timing module (5) starts timing. When the preset submersion time is reached, the pressure detection element (223) detects the buoyancy of the water tank (100) transmitted by the second connecting arm (222) and transmits it to the control module (4). The control module (4) compares the received buoyancy with the preset buoyancy value and controls the alarm module (6) to give different prompt information according to different comparison results.

2. The water tank airtightness testing device according to claim 1, characterized in that, The first connecting arm (221) is a sleeve with an opening at the bottom, and the inner wall of the opening extends inward to form a stop; the second connecting arm (222) is a T-shaped rod that matches the sleeve.

3. The water tank airtightness testing device according to claim 1, characterized in that, The robotic arm (22) also includes an elastic element (224) disposed between the second connecting arm (222) and the pressure detection element (223) to buffer the impact force of the second connecting arm (222) on the pressure detection element (223).

4. A method for testing the airtightness of a water tank, characterized in that, The method using the water tank airtightness testing equipment according to any one of claims 1-3 includes the following steps: S1: After completely sealing all external interfaces (104) of the water tank (100) to be tested, it is completely submerged in water; S2: After standing for a period of time, measure the buoyancy of the water tank (100) and compare it with the preset buoyancy value. If the measured buoyancy is less than the preset buoyancy value, the sealing is poor; otherwise, the sealing is good. The preset buoyancy value refers to the buoyancy of a well-sealed water tank when it is completely submerged in water. When the water tank (100) to be tested is completely submerged in water in step S1, the following steps are also included: The water tank (100) needs to be placed at a certain depth, wherein the certain depth means that when the water tank (100) is in water at that depth, the water pressure can exceed the air pressure inside the water tank (100); and / or The effect of water tension is eliminated by using an ultrasonic device (3).

Images