Waterproof belt water absorption expansion height detection device

Abstract

The utility model discloses a kind of water-blocking belt water-absorbing expansion height detection devices, including the cup body unit of transparent material and the cover plate unit of concentric gap being inserted in the cup body unit, the inner bottom center of the cup body unit is equipped with the positioning frustum that is upwardly convex, outer bottom concentric is equipped with the annular cut piece that is downwardly convex, the height of the positioning frustum is less than 1 / 3 of water-blocking belt thickness, the diameter of the annular cut piece is less than the inner diameter of cup body unit and difference is greater than the transverse expansion of water-blocking belt;The cover plate unit includes cylindrical body and the water storage groove concentrically arranged at the top of cylindrical body, the center of the water storage groove is equipped with the handle that is upwardly convex and the multiple liquid injection through-holes that are arrayed around handle, the gap between the cup body unit and cover plate unit is not greater than 0.25mm.The utility model improves the assembly convenience of test device, while guarantee that water-blocking belt can be free expansion, ensure that expansion height test is accurate.

Description

Technical Field

[0001] This utility model relates to the field of water-blocking tape performance testing technology, and in particular to a device for detecting the water absorption and expansion height of a water-blocking tape. Background Technology

[0002] In submarine power and communication cables, water-blocking tape is a key waterproofing material, widely used between the cable core and the outer sheath to prevent moisture from penetrating longitudinally along the cable. Its core function relies on its water absorption and swelling properties—when water seeps into the cable, the water-blocking tape rapidly absorbs and swells, forming a dense gel layer that effectively blocks further water diffusion. Different water-blocking tape formulations result in different swelling heights and varying water-blocking effects. In reality, the regulations for testing the water absorption and swelling height of water-blocking tape are not detailed enough, leading to inconsistent test results and poor testing efficiency.

[0003] Chinese invention patent CN115993427B discloses a water-blocking tape testing device, comprising a cup unit consisting of a main body and a fixing rod disposed within the main body. The fixing rod is arranged along the axial direction of the main body. The main body includes a first cup and a second cup connected to each other, wherein the diameter of the second cup is larger than the diameter of the first cup, providing horizontal space for the expansion of the water-blocking tape and avoiding affecting the expansion in the vertical direction. A pressure plate is sleeved on the fixing rod, and the pressure plate has multiple injection holes. During testing, the water-blocking tape to be tested is placed in the second cup, and liquid is injected into the second cup through the injection holes. By measuring the change in test height, the water-blocking tape's water absorption and expansion height can be detected.

[0004] While the above solution achieves the detection of the water-blocking tape's swelling height, in actual testing, the lateral expansion of the water-blocking tape easily leads to an interference fit between the tape and the fixing rod. Uneven stress distribution during overall expansion causes bending deformation, affecting the final height test results. Furthermore, when placing the pressure plate, a suitable gap must be maintained between the pressure plate's central through-hole and the fixing post to ensure proper lifting. However, due to the small gap between the first cup and the pressure plate, the operating space is limited, and the pressure plate is prone to eccentric tilting and jamming, requiring manual readjustment, which is cumbersome in practice. Therefore, structural optimization of the existing detection device is necessary. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a device for detecting the water absorption and expansion height of a water-blocking tape. This device improves the ease of assembly of the testing device while ensuring that the water-blocking tape can expand freely, thus ensuring accurate measurement of the expansion height.

[0006] The technical solution to achieve the purpose of this utility model is:

[0007] A device for detecting the water absorption and expansion height of a water-blocking tape includes a transparent cup unit and a cover unit concentrically inserted into the cup unit. The cup unit has an upwardly protruding positioning cone at its inner bottom center and a downwardly protruding annular block concentrically positioned at its outer bottom. The height of the positioning cone is less than 1 / 3 of the thickness of the water-blocking tape, and the diameter of the annular block is less than the inner diameter of the cup unit, with the difference being greater than the lateral expansion of the water-blocking tape. The cover unit includes a columnar body and a water-collecting groove concentrically positioned at the top of the columnar body. The center of the water-collecting groove has an upwardly protruding handle and multiple liquid injection holes arranged in an array around the handle. The gap between the cup unit and the cover unit is no greater than 0.25 mm.

[0008] Furthermore, the side wall of the cup unit is pre-marked with a scale, and the zero point of the scale is flush with the inner bottom of the cup unit.

[0009] Furthermore, the water storage groove is provided with multiple annular grooves concentrically and at equal intervals, and the liquid injection holes are respectively located on the multiple annular grooves, and the liquid injection holes located on the same set of annular grooves are evenly distributed circumferentially.

[0010] Furthermore, the width of the annular groove is not less than the diameter of the injection through hole, and the diameter of the injection through hole is 2 to 2.5 mm.

[0011] Furthermore, the handle is a hollow columnar structure with a water injection pipe connected to the top and a diversion hole connected to the outer periphery of the bottom.

[0012] Furthermore, the diversion hole is inclined downward from the inside to the outside and is directly opposite the annular groove located in the inner ring. A strip groove is provided between adjacent annular grooves, and the strip grooves are staggered by 180° from the inside to the outside.

[0013] Furthermore, a Peltier device is embedded on the outer side wall of the cup unit near the lower part, and a patch temperature sensor is embedded in the inner bottom. The temperature sensor is electrically connected to a PID controller, which is also electrically connected to the Peltier device to control the water-blocking strip to maintain the expansion height detection at a preset temperature.

[0014] Furthermore, it also includes an air compressor, a pressure regulating valve, and a pressure vessel connected by pipelines. The cup body unit is located in a sealed pressure vessel. The side wall of the pressure vessel is provided with a transparent viewing window. A patch pressure sensor is embedded in the bottom of the cover plate unit. The patch pressure sensor and the pressure regulating valve are both electrically connected to a PID controller to control the water-blocking strip to maintain the expansion height detection at a preset pressure.

[0015] By adopting the above technical solution, this utility model has the following beneficial effects:

[0016] (1) This utility model uses a cup unit with a pre-set bottom ring-shaped cut. By pressing the cup unit directly onto the water-blocking tape to be tested, a water-blocking tape sample imprint that meets the testing requirements can be obtained on the surface of the water-blocking tape. Then, a water-blocking tape test sample of appropriate size can be quickly obtained by cutting. The entire cup unit is transparent, so the cut water-blocking tape test sample can be placed in the center of the cup unit and pre-fixed by the positioning cone to prevent skewing. The gap between the water-blocking tape test sample and the cup unit provides space for the water-blocking tape to expand freely in the lateral direction, avoiding the influence on the longitudinal height expansion. In addition, the cover plate unit is structurally optimized by adding a handle design to facilitate the adjustment of the level of the cover plate unit. The overall structural design improves the ease of assembly of the test device while ensuring that the water-blocking tape can expand freely, ensuring accurate expansion height testing.

[0017] (2) This utility model makes it easy to read the height expansion of the water-blocking band directly by pre-setting the scale on the cup unit.

[0018] (3) This utility model provides positioning for the injection through hole by pre-setting multiple sets of concentric annular grooves in the water storage groove, and forms a water storage space with a lower water level in the water storage groove. This avoids the situation where the local injection through hole is higher than the injection level due to the tilt of the cover plate unit when the injection volume is small, which would cause the water-blocking strip under the injection through hole to absorb water unevenly and affect the final measurement data. In addition, due to the setting of the annular groove, the water in the water storage groove can basically be immersed into the water-blocking strip through the annular groove and the injection through hole, which is more convenient for water absorption testing.

[0019] (4) By setting the handle to a hollow structure and providing a water injection pipe and a diversion hole, the handle can perform its own function while also taking into account the pipe flow function, making it convenient to inject liquid.

[0020] (5) The present invention sets the diversion hole as an oblique hole structure, so that the liquid in the injection handle can flow more smoothly into the annular groove. The strip groove used to connect adjacent annular grooves is offset by 180°, so that the liquid can flow from the annular groove located in the inner ring to the annular groove located in the outer ring, and finally fill the entire water storage groove, ensuring that the liquid can penetrate into the sample more evenly and reducing the expansion measurement error caused by uneven liquid flow.

[0021] (6) By adding a pressure control system consisting of a PID controller, an air compressor, a pressure regulating valve, a pressure vessel and a pressure sensor, and a temperature control system consisting of a PID controller, a Peltier device and a temperature sensor, the water absorption and expansion test of the entire water-blocking tape can be carried out under preset temperature and pressure, which is more in line with the real use scenario and thus obtains more accurate measurement results. Attached Figure Description

[0022] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0023] Figure 1 This is a simplified structural diagram of the present invention;

[0024] Figure 2 For the present utility model Figure 1 Enlarged view of section A in the image;

[0025] Figure 3 This is a structural block diagram of the pressure control system and temperature control system of this utility model;

[0026] Figure 4 This is a simplified structural diagram of the cup body unit of this utility model;

[0027] Figure 5 This is a top view of the water storage groove of this utility model.

[0028] The labels in the attached diagram are:

[0029] Cup body unit 1, positioning cone 1-1, circular cut block 1-2, cover plate unit 2, columnar body 2-1, water storage groove 2-2, handle 2-3, liquid injection through hole 2-4, annular groove 2-5, water injection pipeline 2-6, diversion hole 2-7, strip groove 2-8, Peltier device 3, temperature sensor 4, PID controller 5, pressure sensor 6, pressure regulating valve 7, air compressor 8, pressure vessel 9. Detailed Implementation

[0030] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0031] (Example 1)

[0032] like Figures 1 to 5The water-blocking tape swelling height detection device shown includes a transparent cup unit 1 and a cover plate unit 2 concentrically inserted into the cup unit 1. The gap between the cup unit 1 and the cover plate unit 2 is no more than 0.25mm, which ensures that the cover plate unit 2 can move up and down while reducing the movement space of the cover plate unit 2, which helps to adjust the cover plate unit 2 to a horizontal state. The inner bottom center of the cup unit 1 is provided with an upwardly protruding positioning cone 1-1, and the outer bottom is concentrically provided with a downwardly protruding annular block 1-2. The height of the positioning cone 1-1 is less than 1 / 3 of the thickness of the water-blocking tape to be tested, and it is used to fix the water-blocking tape sample for testing. The diameter of the annular block 1-2 is smaller than the inner diameter of the cup unit 1, and the difference is greater than the lateral expansion of the water-blocking tape. During testing, by directly pressing the cup unit 1 onto the water-blocking tape to be tested, a water-blocking tape sample imprint meeting the testing requirements can be obtained on the surface of the water-blocking tape. Then, a water-blocking tape test sample of suitable size can be quickly obtained by cutting. The entire cup unit is transparent, allowing the cut water-blocking tape test sample to be placed centered in the center of the cup unit 1 and pre-fixed by the positioning cone 1-1 to prevent tilting. The gap between the water-blocking tape test sample and the cup unit 1 provides space for the water-blocking tape to expand freely laterally, avoiding any impact on longitudinal height expansion. The cover unit 2 includes a columnar body 2-1 and a water-retaining groove 2-2 concentrically located on the top of the columnar body 2-1. A handle 2-3 protrudes upwards from the center of the water-retaining groove 2-2, and multiple liquid injection holes 2-4 are arranged in an array outside the handle 2-3 within the water-retaining groove 2-2.

[0033] To simulate a more realistic usage scenario for the water-blocking tape, this embodiment includes a pressure control system and a temperature control system to ensure the entire test is conducted within a preset pressure and temperature environment. Specifically, a Peltier device 3 is embedded near the lower part of the outer wall of the cup unit 1, and a patch-type temperature sensor 4 is embedded in the inner bottom. The temperature sensor 4 is electrically connected to a PID controller 5, which is also electrically connected to the Peltier device 3. The temperature sensor 4 monitors the ambient temperature of the water-blocking tape in real time and feeds the result back to the PID controller 5. The PID controller 5 then controls the Peltier device 3 to operate according to the preset temperature, ensuring the water-blocking tape is maintained at the preset temperature for the expansion test. The PID controller 5 is also electrically connected to a patch-type pressure sensor 6 and a pressure regulating valve 7. The inlet and outlet of the pressure regulating valve 7 are connected to an air compressor 8 and a pressure vessel 9 via pipelines, respectively. The pressure vessel 9 is a sealed structure with a transparent window on its side wall, allowing direct observation of the internal test. The cup unit 1 is placed inside the pressure vessel 9. Considering that the cover unit 1 itself has a certain weight, it will exert pressure on the water-blocking strip. In order to simulate more realistically, in this embodiment, the pressure sensor 6 is embedded in the bottom of the cover unit 1. The pressure sensor 6 monitors the ambient pressure of the water-blocking strip and feeds the result back to the PID controller 5. The PID controller 5 controls the pressure regulating valve 7 to work according to the preset pressure so that the water-blocking strip is kept at the preset pressure for the expansion test.

[0034] In order to facilitate the measurement of the expansion height of the water-blocking strip, the side wall of the cup unit 1 is pre-set with a scale. The zero point of the scale is flush with the inner bottom of the cup unit 1. The height value of the water-blocking strip can be intuitively obtained through the scale display. During the test, the side of the cup unit 1 with the scale is turned to face the transparent window of the pressure vessel 9 for easy reading.

[0035] Multiple annular grooves 2-5 are concentrically arranged and evenly spaced within the water storage groove 2-2. Injection holes 2-4 are located on each of the annular grooves 2-5, and the injection holes on the same set of annular grooves 2-5 are evenly distributed circumferentially. The width of each annular groove 2-5 is not less than the diameter of the injection hole 2-4, and the diameter of the injection hole 2-4 is 2–2.5 mm. By setting multiple sets of concentric annular grooves 2-5, the system serves two purposes: firstly, it provides positioning for the injection holes 2-4, facilitating processing; secondly, it creates a lower water level storage space within the water storage grooves 2-2, preventing uneven water absorption in the water-blocking strip below the injection hole 2-4 due to the tilt of the cover unit 1 when the injection volume is low, thus avoiding uneven water absorption and affecting the final measurement data. Furthermore, the annular grooves 2-5 reduce the total amount of liquid remaining in the non-injection hole area when the water level is low, ensuring that almost all water in the water storage grooves 2-2 can penetrate into the water-blocking strip through the annular grooves 2-5 and the injection holes, facilitating water absorption testing. In this embodiment, there are five annular grooves 2-5, each 2mm wide and 1mm deep, and 60 injection holes 2-4 with a diameter of 2mm each.

[0036] To facilitate liquid injection into the water storage groove 2-2, this embodiment designs the handle 2-3 as a hollow cylindrical structure, with a water injection pipe 2-6 connected to the top and a diversion hole 2-7 connected to the outer periphery of the bottom. The water injection pipe 2-6 extends outside the pressure vessel, and the diversion hole 2-7 is inclined downwards from the inside out, directly facing the annular groove 2-5 located in the inner ring, allowing the liquid injected into the handle to flow more smoothly into the annular groove. Strip grooves 2-8 are connected between adjacent annular grooves 2-5, and multiple strip grooves 2-8 are staggered at 180° from the inside out, allowing the liquid to flow sequentially from the annular groove 2-5 located in the inner ring to the annular groove 2-5 located in the outer ring, ultimately filling the entire water storage groove. This ensures that the liquid can penetrate the sample more evenly, reducing expansion measurement errors caused by uneven liquid flow.

[0037] This invention utilizes a cup unit 1 with pre-set circular cut blocks 1-2 at the bottom. By directly pressing the cup unit 1 onto the water-blocking tape to be tested, a water-blocking tape sample imprint meeting the testing requirements can be obtained on the surface of the water-blocking tape. Then, a water-blocking tape test sample of suitable size can be quickly obtained by cutting. Furthermore, the entire cup unit 1 is transparent, allowing the cut water-blocking tape test sample to be placed centered in the center of the cup unit 1 and pre-fixed by a positioning cone 1-1 to prevent tilting. The gap between the water-blocking tape test sample and the cup unit provides space for the water-blocking tape to expand freely laterally, avoiding any impact on the longitudinal height expansion. In addition, the cover unit 2 has been structurally optimized by adding handles 2-3 to facilitate adjustment of its level. The overall structural design improves the ease of assembly of the testing device while ensuring the water-blocking tape can expand freely, ensuring accurate measurement of the expansion height.

[0038] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above descriptions are merely specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for detecting the water absorption and expansion height of a water-blocking tape, characterized in that: The device includes a transparent cup body unit and a cover plate unit concentrically inserted within the cup body unit. The inner bottom center of the cup body unit has an upwardly protruding positioning cone, and the outer bottom has a concentrically protruding annular block. The height of the positioning cone is less than 1 / 3 of the thickness of the water-blocking strip, and the diameter of the annular block is less than the inner diameter of the cup body unit, with the difference being greater than the lateral expansion of the water-blocking strip. The cover plate unit includes a columnar body and a water-collecting groove concentrically located on the top of the columnar body. The center of the water-collecting groove has an upwardly protruding handle and multiple liquid injection holes arranged in an array around the handle. The gap between the cup body unit and the cover plate unit is no greater than 0.25 mm.

2. The water-blocking tape water absorption expansion height detection device according to claim 1, characterized in that: The side wall of the cup unit is pre-marked with a scale, and the zero point of the scale is flush with the inner bottom of the cup unit.

3. The water-blocking tape water absorption expansion height detection device according to claim 1, characterized in that: The water storage groove is provided with multiple annular grooves concentrically and at equal intervals. The liquid injection holes are located on the multiple annular grooves respectively, and the liquid injection holes located on the same set of annular grooves are evenly distributed circumferentially.

4. The water-blocking tape water absorption expansion height detection device according to claim 3, characterized in that: The width of the annular groove is not less than the diameter of the injection through hole, and the diameter of the injection through hole is 2 to 2.5 mm.

5. The water-blocking tape water absorption expansion height detection device according to claim 3, characterized in that: The handle is a hollow columnar structure with a water injection pipe connected to the top and a diversion hole connected to the outer periphery of the bottom.

6. The water-blocking tape water absorption expansion height detection device according to claim 5, characterized in that: The diversion hole is inclined downward from the inside to the outside and is directly opposite the annular groove in the inner ring. A strip groove is provided between adjacent annular grooves, and the strip grooves are staggered by 180° from the inside to the outside.

7. A water-blocking tape water absorption expansion height detection device according to any one of claims 1 to 6, characterized in that: A Peltier device is embedded on the outer side wall of the cup unit near the lower part, and a patch temperature sensor is embedded in the inner bottom. The temperature sensor is electrically connected to a PID controller, which is also electrically connected to the Peltier device to control the water-blocking strip to maintain the expansion height detection at a preset temperature.

8. The water-blocking tape water absorption expansion height detection device according to claim 7, characterized in that: It also includes an air compressor, a pressure regulating valve, and a pressure vessel connected by pipelines. The cup unit is located in a sealed pressure vessel. The side wall of the pressure vessel is provided with a transparent viewing window. A patch pressure sensor is embedded in the bottom of the cover plate unit. The patch pressure sensor and the pressure regulating valve are both electrically connected to a PID controller to control the water-blocking strip to maintain the expansion height detection at a preset pressure.

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