A device for testing the water permeability of coated canvas

Abstract

The utility model relates to a kind of plastic-coated canvas water permeability test devices, it relates to the technical field of material performance testing, it includes the pressure cylinder of upper opening and the support frame of fixed installation in its outside, the support frame top is equipped with long screw rod, long screw rod bottom end is connected with the compacting frame that can compact plastic-coated canvas on the upper end of pressure cylinder, compacting frame is double-layer structure, the water permeability of plastic-coated canvas can be directly observed, lower pressing ring lower side is provided with the annular sealing gasket that is protruding downward, and with the annular groove cooperation of pressure cylinder top edge, plastic-coated canvas is compacted, effectively avoid water from plastic-coated canvas edge leakage;Pressure cylinder side wall is respectively connected with inlet pipe and outlet pipe, outlet pipe is connected with drain pipe and pressure measuring communication pipe respectively by tee joint;The utility model does not need additional complex pressure measuring equipment, the water level of pressure measuring communication pipe is used as real-time water pressure, observe the water permeability trace of plastic-coated canvas under different water pressure after water supply, obtain the water permeability of plastic-coated canvas in initial state.

Description

Technical Field

[0001] This utility model relates to the technical field of material performance testing, and in particular to a device for testing the water permeability of coated canvas. Background Technology

[0002] Plastic-coated canvas is a composite material made of canvas as a base, with a layer of polyvinyl chloride as a waterproof coating applied to the surface of the canvas through a plastic coating process. It is widely used in industrial and agricultural fields such as tents and tarpaulins. The water permeability of plastic-coated canvas is one of the core performance indicators, and the water permeability of plastic-coated canvas needs to be tested before leaving the factory.

[0003] Existing testing devices for the permeability of coated canvas typically clamp and fix the edge of the canvas inside a cylinder and inject water into one side. On the other side of the canvas, a special pressure measuring instrument is used in conjunction with a power device to obtain the permeability of the coated canvas. This method is costly and the test results are easily affected by interference. In addition, under high water pressure, water leakage is likely to occur at the fixed edge of the canvas, which cannot truly reflect the actual permeability of the canvas. Utility Model Content

[0004] In order to improve the problems in the process of testing the water permeability of coated canvas in the above-mentioned background art, this utility model provides a testing device for the water permeability of coated canvas.

[0005] The present invention provides a water permeability testing device for coated canvas, which adopts the following technical solution: A water permeability testing device for coated canvas includes a pressure-bearing cylinder with an opening at the top and a support frame fixedly installed on its exterior.

[0006] The pressure cylinder has an inlet pipe and an outlet pipe connected to its side wall. The outlet pipe is connected to a drain pipe via a tee connector, as well as a pressure measuring pipe that is vertically installed and whose upper section is above the horizontal plane of the opening at the top of the pressure cylinder. The cooperation of the inlet pipe, outlet pipe and tee connector enables the orderly control of water inflow and drainage.

[0007] The top of the support frame is provided with a long screw, and the bottom end of the long screw is connected to a clamping frame that can press the plastic-coated canvas tightly onto the upper end of the pressure cylinder, which can quickly fix the plastic-coated canvas onto the upper end of the pressure cylinder and provide a stable test environment for water permeability testing.

[0008] Furthermore, the pressing frame includes an upper pressing plate located at the lower end of the long screw, and a lower pressing ring located on the lower side of the upper pressing plate; the outer ring of the lower pressing ring is connected to the upper pressing plate through several support pillars spaced apart to ensure that the pressing force on the canvas is evenly distributed.

[0009] Furthermore, the specifications of the lower pressure ring are adapted to the specifications of the upper end of the pressure cylinder, and the lower pressure ring can completely cover the upper end surface of the pressure cylinder, so that the plastic-coated canvas is fully in contact with the upper edge of the pressure cylinder when it is compressed.

[0010] Furthermore, an annular sealing gasket is provided on the lower side of the pressure ring, and an annular groove is provided on the top edge of the pressure cylinder corresponding to the annular sealing gasket. Compared with simple flat pressing, this can effectively prevent water from leaking from the edge of the coated canvas.

[0011] Furthermore, the upper pressure plate is rotatably connected to the long screw.

[0012] Furthermore, the support frame includes a horizontal base plate supporting the pressure cylinder and an n-shaped bracket spanning the upper part of the pressure cylinder, which can stably support the pressure of the long screw. The long screw vertically penetrates the middle of the upper side of the bracket and is spirally connected to the bracket.

[0013] Furthermore, a butterfly-shaped handle is provided at the top of the long screw to increase the gripping contact area.

[0014] Furthermore, an inlet control valve is installed on the inlet pipe to flexibly adjust the inlet flow rate and control the start and stop of the inlet, so as to accurately control the filling speed and water volume in the pressure cylinder according to the test requirements. Both output ends of the three-way connector are equipped with shut-off valves.

[0015] Furthermore, the pressure measuring and connecting pipe is a transparent pipe, which allows for direct observation of water level changes inside the pipe. The outer wall is provided with scale lines along the axial direction for reading water level height, and the pressure value inside the pressure-bearing cylinder is calculated by measuring the water level difference.

[0016] In summary, this utility model has the following beneficial technical effects: 1. This utility model does not require additional complex pressure measuring equipment. It uses the water level in the pressure measuring connecting pipe as the real-time water pressure. After water supply, the water permeability marks of the coated canvas under different water pressures are observed to obtain the water permeability performance of the coated canvas in the initial state, thus taking into account both the intuitiveness of monitoring and the stability of the device.

[0017] 2. The clamping frame of this utility model has a double-layer structure, which allows direct observation of the water permeability of the coated canvas and captures the water pressure value at the initial moment of water permeation.

[0018] 3. This utility model has an annular sealing gasket on the lower side of the pressure ring, which cooperates with the annular groove on the top edge of the pressure cylinder to press the plastic-coated canvas tightly between the pressure ring and the top edge of the pressure cylinder. Combined with the uniform pressure of the pressing frame, it effectively prevents water from leaking from the edge of the plastic-coated canvas, ensuring reliable sealing and accurate water permeability test results. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a plastic-coated canvas permeability testing device according to an embodiment of this utility model; Figure 2 This is a front view of a plastic-coated canvas permeability testing device according to an embodiment of this utility model; Figure 3 yes Figure 2 Enlarged view of point A in the middle; Figure 4 This is a top view of the installation of a plastic-coated canvas permeability testing device according to an embodiment of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 1. Pressure cylinder; 2. Support frame; 21. Horizontal base plate; 22. Vertical support rod; 23. Crossbeam; 24. Threaded hole; 3. Long screw; 35. Butterfly handle; 4. Pressing frame; 41. Upper pressure plate; 42. Support column; 43. Lower pressure ring; 44. Observation window; 45. Annular sealing gasket; 46. Annular groove; 47. Supplemental light; 5. Water inlet pipe; 51. Water inlet control valve; 6. Water outlet pipe; 7. T-connector; 71. Shut-off valve; 8. Pressure testing connecting pipe; 81. Scale line; 9. Drain pipe. Detailed Implementation

[0021] The following combination Figures 1-4 The present invention will be described in further detail below.

[0022] This utility model discloses a device for testing the water permeability of coated canvas.

[0023] Reference Figure 1 A water permeability testing device for coated canvas includes a pressure cylinder 1 with an open top, a support frame 2 fixedly installed on the outside of the pressure cylinder 1, a long screw 3 threaded through and connected to the top of the support frame 2, and a clamping frame 4 fixedly connected to the bottom of the long screw 3, which can press the coated canvas tightly against the upper end of the pressure cylinder 1.

[0024] Furthermore, combined Figure 2 The clamping frame 4 includes an upper pressure plate 41 located at the lower end of the long screw 3, which is vertically connected to the bottom end of the long screw 3, and a lower pressure ring 43 located on the lower side of the upper pressure plate 41 to press the plastic-coated canvas. The specifications of the lower pressure ring 43 are adapted to the specifications of the upper end of the pressure cylinder 1.

[0025] The outer ring of the lower pressure ring 43 is connected to the upper pressure plate 41 through several support columns 42 with gaps, forming a stable structure that presses down the coated canvas. An observation window 44 is provided between adjacent support columns 42 to observe the water permeability of the coated canvas. The water permeability of the coated canvas can be observed through the observation window 44.

[0026] As an optional structure, the bottom side of the upper pressure plate 41 is provided with a supplementary light 47 facing the coated canvas.

[0027] As an optional structure, the upper pressure plate 41 is rotatably connected to the long screw 3.

[0028] Combination Figure 2 , Figure 3The lower side of the pressure ring 43 is also provided with a downward protruding annular sealing gasket 45. The top edge of the pressure cylinder 1 is provided with an annular groove 46 that matches the annular sealing gasket 45. The protruding annular sealing gasket 45 engages with the annular groove 46 to enhance the sealing between the pressure ring 43 and the top edge of the pressure cylinder 1, and to prevent water from leaking from the edge of the plastic-coated canvas during the test.

[0029] Reference Figure 1 , Figure 2 , Figure 4 The pressure-bearing cylinder 1 has a pressure-bearing cavity inside that contains water. The upper part of the side wall of the pressure-bearing cylinder is connected to the water inlet pipe 5, and the lower part of the side wall of the pressure-bearing cylinder is connected to the water outlet pipe 6. The water outlet pipe 6 is connected to the drain pipe 9 that discharges water from the pressure-bearing cavity through the tee joint 7, and the pressure measuring connecting pipe 8 is set vertically and its upper section is higher than the horizontal plane where the upper opening of the pressure-bearing cylinder 1 is located. The pressure measuring connecting pipe 8 is a transparent pipe and its outer wall is provided with scale lines 81 along the axial direction for reading the water level.

[0030] Furthermore, an inlet control valve 51 is installed on the inlet pipe 5, and a shut-off valve 71 is installed on both output ends of the tee connector 7. The shut-off valve 71 is used to control the flow of water.

[0031] Reference Figure 1 , Figure 2 The support frame 2 includes a horizontal base plate 21 that supports the pressure cylinder 1. The bottom of the horizontal base plate 21 is provided with support legs. An n-shaped bracket spans the upper part of the pressure cylinder 1. The bracket includes vertical support rods 22 symmetrically arranged around the pressure cylinder 1. The bottom end of the vertical support rods 22 is vertically fixed to the horizontal base plate 21, and a horizontal crossbeam 23 is fixed at the top. A long screw rod 3 vertically penetrates the middle of the upper side of the bracket. A threaded hole 24 is opened in the center of the crossbeam 23, through which the long screw rod 3 passes. The surface of the long screw rod 3 is provided with external threads, and the threaded hole 24 is provided with internal threads and cooperates with the long screw rod 3. The long screw rod 3 can move up and down by rotating itself and is helically connected to the bracket.

[0032] Furthermore, a butterfly handle 35 is provided at the top of the long screw 3. The radial dimension of the butterfly handle 35 is larger than the diameter of the long screw 3 to increase the rotational torque. Turning the butterfly handle 35 can adjust the distance between the lower pressure ring 43 and the top edge of the pressure cylinder 1.

[0033] The implementation principle of the water permeability testing device for coated canvas in this embodiment of the utility model is as follows: Cut the coated canvas to be tested for water permeability and lay it flat on the top edge of the pressure cylinder 1. Rotate the butterfly handle 35 to make the long screw 3 drive the clamping frame 4 to descend until the annular sealing gasket 45 of the lower pressure ring 43 is embedded in the annular groove 46 of the pressure cylinder 1, thus tightly clamping the edge of the coated canvas.

[0034] Open the shut-off valve 71 of the pressure measuring connecting pipe 8 and slowly open the water inlet control valve 51 to supply water and pressurize the pressure cylinder 1. The water level in the pressure measuring connecting pipe 8 rises. Continuously observe the central area of ​​the coated canvas through the observation window 44. When water seepage marks appear, read the real-time water pressure through the scale line 81 of the pressure measuring connecting pipe 8.

[0035] After the test, close the inlet control valve 51 and the shut-off valve 71 connecting the pressure measuring pipe 8, open the shut-off valve 71 connecting the drain pipe 9, drain the water in the pressure measuring pipe 8 and the pressure cylinder 1, rotate the butterfly handle 35 in the opposite direction, raise the clamping frame 4, take out the tested coated canvas, and complete the test.

[0036] The above are all preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made to the structure, shape and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A device for testing the water permeability of coated canvas, characterized in that: It includes a pressure-bearing cylinder (1) with an opening at the top and a support frame (2) fixedly installed on its exterior. The side wall of the pressure cylinder (1) is connected to an inlet pipe (5) and an outlet pipe (6). The outlet pipe (6) is connected to a drain pipe (9) via a tee connector (7) and a pressure measuring connecting pipe (8) that is vertically arranged and whose upper section is above the horizontal plane of the upper opening of the pressure cylinder (1). The support frame (2) is provided with a long screw (3) at the top, and the bottom end of the long screw (3) is connected to a pressing frame (4) that can press the plastic-coated canvas onto the upper end of the pressure cylinder (1).

2. The water permeability testing device for coated canvas according to claim 1, characterized in that: The clamping frame (4) includes an upper pressure plate (41) located at the lower end of the long screw (3) and a lower pressure ring (43) located on the lower side of the upper pressure plate (41); the outer ring of the lower pressure ring (43) is connected to the upper pressure plate (41) through a plurality of support columns (42) spaced apart.

3. The water permeability testing device for coated canvas according to claim 2, characterized in that: The specifications of the lower pressure ring (43) are compatible with the specifications of the upper end of the pressure cylinder (1).

4. The water permeability testing device for coated canvas according to claim 2, characterized in that: The lower side of the pressure ring (43) is also provided with an annular sealing gasket (45), and the top edge of the pressure cylinder (1) is provided with an annular groove (46) corresponding to the annular sealing gasket (45).

5. The water permeability testing device for coated canvas according to claim 2, characterized in that: The upper pressure plate (41) is rotatably connected to the long screw (3).

6. The water permeability testing device for coated canvas according to claim 1, characterized in that: The support frame (2) includes a horizontal base plate (21) supporting the pressure cylinder (1) and an n-shaped bracket spanning the upper part of the pressure cylinder (1). The long screw (3) vertically penetrates the middle of the upper side of the bracket and is spirally connected to the bracket.

7. The water permeability testing device for coated canvas according to claim 6, characterized in that: The long screw (3) is provided with a butterfly handle (35) at its top end.

8. The water permeability testing device for coated canvas according to claim 1, characterized in that: The water inlet pipe (5) is equipped with a water inlet control valve (51), and both output ends of the three-way connector (7) are equipped with shut-off valves (71).

9. The water permeability testing device for coated canvas according to claim 1, characterized in that: The pressure measuring tube (8) is a transparent tube, and the outer wall is provided with scale lines (81) along the axial direction for reading the water level.

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