Water permeability detection device and detection method

Abstract

The invention discloses a water permeability detection device, which comprises: a jig capable of bearing a sample to be detected; the positioning rod is connected with a first driving device, and the positioning rod moves in the first direction under the action of the first driving device; the positioning pipe and the positioning rod are oppositely arranged, an outlet of the positioning pipe faces the positioning rod, the positioning pipe is connected with a second driving device, the positioning pipe moves in the first direction under the action of the second driving device, and the positioning pipe and the positioning rod can be clamped on the two sides of a to-be-detected area of the to-be-detected sample respectively; an outlet of the pump is communicated with an inlet of the positioning pipe; and the positive electrode and the negative electrode of the current tester are respectively connected with one of the positioning rod and the positioning pipe. The invention further discloses a detection method using the water permeability detection device, whether the sample to be detected is permeable or not is judged according to whether the current tester is connected or not, and the detection speed is high and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of waterproof detection, and specifically to a water permeability detection device and a detection method. Background Art

[0002] When inspecting welded seals, airtightness detection is mostly used for rapid detection. However, the semi-permeable membrane is permeable to air but not to water, so the air measurement method cannot be used to test whether the welding is completely sealed. The conventional test method is to apply pressure with water and then determine whether there are water droplets passing through by visual inspection or machine vision. However, such a method takes a long time and the judgment is not accurate. Summary of the Invention

[0003] In order to overcome the defects in the prior art, the present invention provides a water permeability detection device and a detection method. The detection method determines whether the sample to be detected is water permeable by whether the current tester is conductive, and the detection speed is fast and accurate.

[0004] To achieve the above object, the technical solution adopted by the present invention is: A water permeability detection device, comprising: A jig for placing the sample to be detected; A positioning rod connected to a first driving device. Under the action of the first driving device, the positioning rod moves along a first direction; A positioning tube opposite to the positioning rod. The outlet of the positioning tube faces the positioning rod. The positioning tube is connected to a second driving device. Under the action of the second driving device, the positioning tube moves along the first direction. The positioning tube and the positioning rod can be respectively clamped on both sides of the area to be detected of the sample to be detected; A pump, the outlet of which is communicated with the inlet of the positioning tube; A current tester, the positive and negative poles of which are respectively connected to one of the positioning rod and the positioning tube.

[0005] Through the above solution, the sample to be detected is placed on the jig, the positioning rod and the positioning tube move towards the through hole, so as to clamp the area to be detected of the sample to be detected. The pump conveys water into the positioning tube to make the water pressure in the positioning tube reach a preset value. The current tester is powered on for testing and keeps the power on for a preset time. If the current tester does not detect current, the sample to be detected is not water permeable. If the current tester detects current, the sample to be detected is water permeable. Compared with the traditional method of observing whether there are water droplets on the back of the sample to be detected, the detection speed of the water permeability detection device disclosed in the present application is faster and more accurate.

[0006] Further, it comprises a box body, the box body is connected to the driving end of the second driving device, a first connecting pipe is provided on the surface of the box body, the first connecting pipe is communicated with the inner cavity of the box body, the first connecting pipe is provided with a first thread, the inlet of the positioning pipe is provided with a second thread, and the positioning pipe is connected to the first connecting pipe through the second thread and the first thread; A second connecting pipe is provided on the surface of the box body, the second connecting pipe is communicated with the inner cavity of the box body, and the second connecting pipe is connected to the water outlet of the pump.

[0007] Furthermore, the positioning rod and the positioning tube are respectively provided with a third thread and sleeved with a connecting nut, and the positive pole and the negative pole of the current tester are respectively connected to the connecting nut on the positioning rod or the positioning tube.

[0008] The positive and negative poles of the current tester are connected with cables, and the end of the cable facing away from the positive pole of the current tester is connected to the third thread of the positioning rod, and the end of the cable facing away from the negative pole of the current tester is connected to the third thread of the positioning tube. The positioning rod and the positioning tube are connected to the positive and negative poles of the current tester through connecting nuts, and the connection method is simple and the connection structure is stable.

[0009] Furthermore, the fixture includes a fixed support plate, the upper side of the support plate is configured to match the shape of the sample to be tested, and the support plate is provided with a through hole, and when the sample to be tested is placed on the support plate, the test area of ​​the sample to be tested is located at the through hole. The upper side of the support plate is configured to match the shape of the sample to be tested, so as to limit the movement of the sample to be tested in the horizontal direction; the support plate is provided with a through hole for the support tube to contact the sample to be tested.

[0010] Furthermore, a pressure gauge is included, the box body is provided with a third connecting pipe, the third connecting pipe is connected to the inner cavity of the box body, and the receiving end of the pressure gauge is connected to the third connecting pipe. The pressure gauge is used to monitor the water pressure in the box body in real time to ensure that the water pressure can reach a preset value.

[0011] Furthermore, a water tank is included, the water tank can store water, the water tank is connected to the water inlet of the pump, the water tank can store water and be used as a water source, so as to avoid limiting the use position of the water penetration detection device.

[0012] Furthermore, a conductive head is provided at one end of the positioning rod facing the fixture, and the conductive head and the positioning rod are detachably connected, that is, the conductive head and the sealing ring are both replaceable.

[0013] Furthermore, the radial cross-sectional area of ​​the positioning rod and the positioning tube is greater than or equal to the cross-sectional area of ​​the test area of ​​the sample to be tested; The cross-sectional area of ​​the through hole is greater than or equal to the radial cross-sectional area of ​​the positioning tube.

[0014] Through this solution, it is ensured that the positioning tube can pass through the through-hole and directly contact the sample to be detected. At the same time, the end face of the positioning rod facing the sample to be detected can completely cover the area to be measured, and the end face of the positioning tube facing the sample to be detected can completely cover the area to be measured.

[0015] A water permeability detection method using the above water permeability detection device includes the following steps: Place the sample to be detected on the jig so that the area to be measured of the sample to be detected is located at the through-hole. The first driving device and the second driving device respectively drive the positioning rod and the positioning tube to move towards the through-hole of the jig, so as to clamp the area to be measured of the sample to be detected. The pump continuously transports water into the inner cavity of the box body, so that the water pressure in the inner cavity of the box body gradually increases until the water pressure reaches a preset value. The current tester is powered on for testing and keeps the power-on preset time. If the current tester fails to detect current, the sample to be detected is impermeable. If the current tester detects current, the sample to be detected is permeable.

[0016] Further, the step that the pump continuously transports water into the inner cavity of the box body, so that the water pressure in the inner cavity of the box body gradually increases until the water pressure reaches a preset value includes: Use a pressure gauge to monitor the water pressure in the box body in real time.

[0017] By means of the above technical solution, the beneficial effects of the present invention are as follows: The water permeability detection method disclosed in this application requires placing the sample to be detected on the jig, moving the positioning rod and the positioning tube towards the through-hole, so as to clamp the area to be measured of the sample to be detected. The pump transports water into the positioning tube, so that the water pressure in the positioning tube reaches the preset value. The current tester is powered on for testing and keeps the power-on preset time. If the current tester fails to detect current, the sample to be detected is impermeable. If the current tester detects current, the sample to be detected is permeable. Compared with the traditional solution of observing whether there are water droplets on the back of the sample to be detected, the detection speed of the water permeability detection device disclosed in this application is faster and more accurate.

[0018] To make the above and other objects, features and advantages of the present invention more obvious and understandable, the following specific preferred embodiments are given, and in conjunction with the accompanying drawings, detailed descriptions are as follows. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is a schematic structural diagram of the water permeability detection device in an embodiment of the present invention; Figure 2 is a schematic structural diagram of the fixture and the sample to be detected in an embodiment of the present invention; Figure 3 is a distribution diagram of the positioning rod, the fixture and the positioning tube in an embodiment of the present invention; Figure 4 is a schematic structural diagram of the positioning tube in an embodiment of the present invention; Figure 5 is a schematic connection structure diagram of the pressure gauge and the positioning tube in an embodiment of the present invention; Figure 6 is a schematic structural diagram of the positioning rod in an embodiment of the present invention.

[0021] Reference numerals of the above drawings: 1, support platform; 11, support plate; 111, through hole; 12, sample to be detected; 121, area to be measured; 13, motor; 21, upper connecting plate; 22, lower connecting plate; 23, connecting rod; 31, first cylinder; 32, positioning rod; 321, conductive head; 41, second cylinder; 42, box body; 43, positioning tube; 431, rubber ring; 5, water pump; 6, water tank; 7, pressure gauge; 8, current tester; 9, connecting nut. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] It should be noted that in the description of the present invention, the terms "first", "second", etc. are only used for descriptive purposes and to distinguish similar objects, and there is no sequence between them, nor can they be understood as indicating or implying relative importance. In addition, in the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0024] Embodiment: An embodiment of the present invention discloses a water permeability detection device, and the water permeability detection device includes: A support platform 1, as Figure 2 shown, a fixture is provided on the support platform 1, and the fixture is used for initially positioning the sample 12 to be detected.

[0025] In some feasible embodiments, the jig includes a support plate 11, the bottom surface of the support plate 11 is fixed on the support platform 1, the upper side of the support plate 11 is configured to match the shape of the sample to be tested 12, and the support plate 11 can position the sample to be tested 12 in the horizontal direction. A semipermeable membrane is welded on the sample to be tested 12, the semipermeable membrane is air permeable but not water permeable, and the water permeability detection device is used to monitor the welding quality to ensure that the welded product is watertight.

[0026] The support plate 11 is provided with a through hole 111. When the sample to be tested is placed on the support plate 11, the test area 121 of the sample to be tested is located at the through hole 111. The test area 121 of the sample to be tested is the area where the semipermeable membrane is welded.

[0027] The support platform 1 is provided with a mounting frame on the side thereof, and the mounting frame includes an upper connecting plate 21 and a lower connecting plate 22. The upper connecting plate 21 and the lower connecting plate 22 are connected and fixed by a connecting rod 23. A first driving device is provided on the upper connecting plate 21. In some feasible embodiments, the first driving device includes a first cylinder 31, such as Figure 3 As shown, the driving end of the first cylinder 31 is connected with a positioning rod 32, the positioning rod 32 is located above the support plate 11, and the end of the positioning rod 32 facing away from the first cylinder 31 faces the through hole 111 of the support plate 11. Driven by the first cylinder 31, the positioning rod 32 moves toward the through hole 111 of the support plate 11 and can be against the test area 121 of the sample 12 to be tested. It should be noted that the end surface of the positioning rod 32 facing the side of the support plate 11 can completely cover the test area 121 of the sample 12 to be tested.

[0028] In some feasible embodiments, the first air cylinder 31 can be replaced by any driving device such as an electric cylinder, a telescopic motor, etc. that can drive the positioning rod 32 to move toward the support plate 11.

[0029] The lower connecting plate 22 is provided with a second driving device. In some feasible embodiments, the second driving device includes a second cylinder 41, such as Figure 3 As shown, the driving end of the second cylinder 41 is connected to a box body 42, and the box body 42 has an inner cavity. The upper end surface of the box body 42 is connected to a positioning tube 43. In some feasible embodiments, the upper end surface of the box body 42 is provided with a first connecting tube 421, such as Figure 4As shown, the first connecting pipe 421 communicates with the inner cavity of the box body 42. The outer surface of the first connecting pipe 421 is provided with a first thread, and the inner side surface of one end of the positioning pipe 43 is provided with a second thread that mates with the first thread. The positioning pipe 43 is connected to the first connecting pipe 421 through the second thread and the first thread. The positioning pipe 43 is located below the support plate 11, and one end of the positioning pipe 43 facing away from the second cylinder 41 faces the through hole 111 of the support plate 11. Driven by the second cylinder 41, the positioning pipe 43 moves towards the through hole 111 of the support plate 11 and can abut against the area to be tested 121 of the sample to be tested 12. It should be noted that the side of the positioning pipe 43 facing the support plate 11 can completely cover the area to be tested 121 of the sample to be tested 12.

[0030] In some feasible embodiments, the second cylinder 41 can be replaced with any driving device such as an electric cylinder or a telescopic motor that can drive the positioning pipe 43 to move towards the support plate 11.

[0031] One end of the positioning pipe 43 facing away from the box body 42 is provided with an elastic sealing ring. In some feasible embodiments, the elastic sealing ring includes a rubber ring 431.

[0032] In some feasible embodiments, the positioning pipe 43 is configured such that its radial cross-sectional area is less than or equal to the cross-sectional area of the through hole 111 on the support plate 11, so that the positioning pipe 43 can pass through the through hole 111 and directly contact the sample to be tested 12.

[0033] The positioning rod 32 and the positioning pipe 43 can move towards the through hole of the support plate 11 under the action of the first cylinder 31 and the second cylinder 41 respectively, and thus clamp above and below the area to be tested 121 of the sample to be tested 12.

[0034] The side of the box body 42 is provided with a second connecting pipe 422. The second connecting pipe 422 communicates with the inner cavity of the box body 42. The second connecting pipe 422 is connected to the water outlet of the water pump 5. The water inlet of the water pump 5 is connected to the water tank 6. When the positioning pipe 43 abuts against the sample to be tested 12, the water pump 5 transports water from the water tank 6 into the positioning pipe 43. Since the outlet of the positioning pipe 43 abuts against the sample to be tested 12, the water cannot be discharged. Under the continuous action of the water pump 5, the water pressure in the positioning pipe 43 gradually increases. During detection, it is necessary to increase the water pressure in the positioning pipe 43 to a preset value and maintain it for a preset time. In some feasible embodiments, the preset value of the water pressure increase is 0.4 bar to 0.6 bar, and the preset time is 1.5 s to 2 s.

[0035] A third connecting pipe 423 is also provided on the side of the box body 42. The third connecting pipe 423 communicates with the inner cavity of the box body 42. As Figure 5 shown, the third connecting pipe 423 is connected to a pressure gauge 7. The pressure gauge 7 is an industrial automation instrument used to measure the pressure of gas or liquid. The receiving end of the pressure gauge 7 is fixed in the third connecting pipe 423 for real-time monitoring of the water pressure in the box body 42. Since the positioning pipe 43 communicates with the inner cavity of the box body 42, that is, the pressure gauge 7 can be used to real-time monitor the water pressure in the positioning pipe 43.

[0036] The positioning rod 32 and the positioning pipe 43 are connected with a current tester 8. The current tester 8 is a portable rectifier instrument with high sensitivity and a multi-range protection circuit, which can be used to monitor whether the circuit is conducting. Third threads are respectively provided on the positioning rod 32 and the positioning pipe 43, and a connecting nut 9 is sleeved thereon. The positive and negative poles of the current tester 8 are respectively connected to the third threads of the positioning rod 32 and the positioning pipe 43 through wires and fixed by the connecting nut 9.

[0037] In some feasible embodiments, the current tester 8 includes a power supply. The positive and negative poles of the power supply are respectively connected to the positioning rod 32 and the positioning pipe 43 through wires, and at least one of the wires is connected in series with an ammeter. The current tester 8 can also be any one of a digital display multimeter, a handheld welding monitor, and a micro-current tester.

[0038] Through the above solution, the sample to be detected 12 is placed on the jig, and the positioning rod 32 and the positioning pipe 43 move towards the through hole 111, so as to clamp the area to be detected 121 of the sample to be detected 12. The water pump 5 conveys water into the positioning pipe 43 to make the water pressure in the positioning pipe 43 reach 0.4 bar to 0.6 bar. The current tester 8 is powered on for testing and keeps powered on for 1.5 s to 2 s. If the current tester 8 fails to detect current, it means that there is no water permeating through the welding position of the semi-permeable membrane, that is, the welding quality is good. If the current tester 8 detects current, it means that there is water permeating through the welding position of the semi-permeable membrane, that is, the welding is unqualified. Compared with the traditional solution of observing whether there are water droplets on the back of the sample to be detected, the detection speed of the water permeation detection device disclosed in this application is faster and more accurate.

[0039] In some feasible embodiments, the support table 1 includes a turntable, and the support plates 11 are arranged at equal intervals along the circumferential direction of the turntable. The circular state is driven to rotate by the motor 13, so as to drive each support plate 11 to be sequentially transmitted between the positioning rod 32 and the positioning pipe 43. The turntable is circular and is made of a transparent material (such as glass).

[0040] In some feasible embodiments, a conductive head 321 is detachably connected to the end face of the positioning rod 32 facing the support plate 11, as Figure 6 shown. The elastic sealing ring and the positioning tube 43 are detachably connected. That is, the conductive head 321 and the elastic sealing ring are replaceable.

[0041] Through the above technical solution, the support plate 11, the conductive head 321 and the elastic sealing ring are replaced according to the requirements of the product to be tested, so that the water permeability detection device disclosed in the present application can be adapted to the water permeability tests of various products.

[0042] A water permeability detection method using the above water permeability detection device includes the following steps: Place the sample 12 to be tested on the support plate 11, so that the area 121 to be tested of the sample 12 to be tested is located at the through hole 111 of the support plate 11; The first driving device and the second driving device respectively drive the positioning rod 32 and the positioning tube 43 to move towards the through hole 111 of the support plate 11, so that the positioning rod 32 and the positioning tube 43 are respectively clamped on the area 121 to be tested of the sample 12 to be tested; The water pump 5 continuously conveys water from the water tank 6 into the inner cavity of the box body 42, and the water in the box body 42 flows from the positioning tube 43 to the sample 12 to be tested. Since the positioning tube 43 abuts against the sample 12 to be tested, the water cannot flow out of the outlet of the positioning tube 43. As the water pump 5 operates, the water pressure in the box body 42 continuously increases; The pressure gauge 7 monitors the magnitude of the water pressure in the box body 42 in real time until the water pressure in the box body 42 reaches 0.5 bar, and the water pump 5 stops pressurizing; The current tester 8 is powered on for testing, and the power is maintained for 1.5 s to 2 s: If water penetrates from the lower side to the upper side of the sample 12 to be tested, the positioning rod 32 and the positioning tube 43 are electrically conducted by the water, and the current tester 8 can detect the current. That is, if the current tester 8 detects the current, it means that the welding is unqualified; If no water penetrates from the lower side to the upper side of the sample 12 to be tested, the positioning rod 32 and the positioning tube 43 are blocked by the sample 12 to be tested, and the current tester 8 cannot detect the current. That is, if the current tester 8 cannot detect the current, it means that the welding is good.

[0043] In the present invention, specific embodiments are used to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A water permeability detection device, characterized in that, Comprising: A jig, which can place the sample to be detected; A positioning rod, which is connected to a first driving device. Under the action of the first driving device, the positioning rod moves along a first direction; A positioning tube, which is arranged opposite to the positioning rod. The outlet of the positioning tube faces the positioning rod. The positioning tube is connected to a second driving device. Under the action of the second driving device, the positioning tube moves along the first direction. The positioning tube and the positioning rod can respectively clamp on both sides of the area to be detected of the sample to be detected; A pump, the outlet of which is communicated with the inlet of the positioning tube; A current tester, the positive and negative electrodes of which are respectively connected to one of the positioning rod and the positioning tube.

2. The water permeability detection device according to claim 1, characterized in that, Comprising a box body, which is connected to the driving end of the second driving device. The surface of the box body is provided with a first connecting pipe, which is communicated with the inner cavity of the box body. The first connecting pipe is provided with a first thread, and the inlet of the positioning tube is provided with a second thread. The positioning tube is connected to the first connecting pipe through the second thread and the first thread; The surface of the box body is provided with a second connecting pipe, which is communicated with the inner cavity of the box body. The second connecting pipe is connected to the water outlet of the pump.

3. The water permeability detection device according to claim 2, wherein The positioning rod and the positioning tube are respectively provided with a third thread and are sleeved with connecting nuts. The positive and negative electrodes of the current tester are respectively connected to the connecting nuts on the positioning rod or the positioning tube.

4. The water permeability detection device according to claim 3, wherein, The jig comprises a fixed support plate, the upper side surface of which is set to match the shape of the sample to be detected. The support plate is provided with a through hole. When the sample to be detected is placed on the support plate, the area to be detected of the sample to be detected is located at the through hole.

5. The water permeability detection device according to claim 4, characterized in that, Comprising a pressure gauge, the box body is provided with a third connecting pipe, which is communicated with the inner cavity of the box body. The receiving end of the pressure gauge is connected to the third connecting pipe.

6. The water permeability detection device according to claim 4, wherein Comprising a water tank, which can store water. The water tank is communicated with the inlet of the pump.

7. The water permeability detection device according to claim 4, wherein, One end of the positioning rod facing the jig is provided with a conductive head, and the conductive head is detachably connected to the positioning rod.

8. The water permeability detection device according to claim 4, wherein, The radial cross-sectional areas of the positioning rod and the positioning tube are greater than or equal to the cross-sectional area of the area to be detected of the sample to be detected; The cross-sectional area of the through hole is greater than or equal to the radial cross-sectional area of the positioning tube.

9. A water permeability detection method using the water permeability detection device according to any one of claims 4-8, characterized in that, Comprising the following steps: Place the sample to be detected on the jig so that the area to be detected of the sample to be detected is located at the through hole; The first driving device and the second driving device respectively drive the positioning rod and the positioning tube to move towards the through hole of the jig, so as to clamp on the area to be detected of the sample to be detected; The pump continuously conveys water into the inner cavity of the box body, so that the water pressure in the inner cavity of the box body gradually increases until the water pressure reaches a preset value; The current tester is powered on for testing and keeps the power-on for a preset time. If the current tester does not detect current, the sample to be detected is waterproof. If the current tester detects current, the sample to be detected is water-permeable.

10. The water permeability detection method according to claim 9, wherein, The step that the pump continuously conveys water into the inner cavity of the box body, so that the water pressure in the inner cavity of the box body gradually increases until the water pressure reaches a preset value includes: Use a pressure gauge to monitor the water pressure in the box body in real time.

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