CN108240956B - Electric low-pressure testing device and method for waterproof coiled material impermeability test - Google Patents

Abstract

The invention relates to an electric low-pressure testing device and method for waterproof coiled material impermeability test, the device comprises a base, a water storage cavity, a water supply mechanism and a positioning mechanism, wherein an electromagnetic valve is arranged between an inlet of a water inlet pipe and a static water pressure supply pipe; be equipped with the packing ring on the water storage chamber, wait to detect the sample and lay on the packing ring, positioning mechanism includes pressure disk, a plurality of positioning unit, locating lever, gag lever post, and limiting plate, and when waiting to detect the sample location, the gag lever post level sets up, and the limiting plate contradicts the bottom of gag lever post for the periphery and the middle part of pressure disk all are in the stress state. On one hand, the invention can automatically complete water supply; on the other hand, the positioning is realized under the peripheral positioning of the pressure plate and the limit of the middle part and through the sealing of the gasket.

Description

Electric low-pressure testing device and method for waterproof coiled material impermeability test

Technical Field

The invention belongs to the field of waterproof coiled material detection equipment, particularly relates to an electric low-pressure testing device for waterproof coiled material impermeability test, and also relates to a waterproof coiled material impermeability test method.

Background

At present, waterproof coiled material impermeability test is usually carried out under static water pressure, mainly through artifical water addition, and the mode of visual inspection control height is carried out, but the height that requires often reaches more than several meters in the test, and not only it is troublesome when not only filling water, also is difficult to accurate in the height control, and this kind of detection device is difficult to popularize all the time, and the precision of testing result is also not high simultaneously.

Meanwhile, the water impermeability detection instrument is an instrument for detecting whether the waterproof material is permeable (seeped) or not, as the name suggests, and is called as a water impermeability instrument for short. At present, the water impermeability instrument mainly comprises two types: one is a high pressure water impermeability instrument; the other is a low-pressure water impermeability instrument. The high-pressure watertight instrument mainly uses external pressure, for example, various tools such as a booster pump and a booster cylinder to detect the waterproof material in a high-pressure environment, and the low-pressure watertight instrument uses a water column to ensure that water in the detection area is tightly attached to the surface of the detection material under the pressure of water in the water column, so that the waterproof material is detected in a low-pressure environment.

And in the location of detection in-process, mainly adopt the pressure disk will wait to detect the sample and fix a position in the detection zone with spreading, and make and wait to detect the sample and contact with water to bear water pressure, observe the pressure disk and whether have the bright water to ooze. Therefore, the stable positioning of the sample to be detected is very important, and the periphery of the pressure plate is connected with the detection area in a positioning way in the conventional positioning way, so that the phenomenon of uneven pressure is easy to occur, and a detection result has certain deviation.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides an improved electric low-pressure testing device for waterproof coiled material impermeability test, which can automatically control electromagnetic closure according to the height of the water level in a static water pressure supply pipe to automatically complete water supply; on the other hand, under the peripheral positioning of the pressure plate and the limiting of the middle part, the positioning of the sample to be detected is realized through the sealing connection of the gasket, the relative balance of the water pressure on the sample to be detected is ensured, and the accuracy of the detection result is improved.

Meanwhile, the invention also provides a waterproof coiled material impermeability test method, which is more convenient to detect and more accurate in result through the arrangement of the electric low-pressure test device.

In order to solve the technical problems, the invention adopts the following technical scheme:

the utility model provides an electronic low pressure testing arrangement that waterproofing membrane imperviousness test was used, its includes:

a base;

the water storage cavity is used for storing water and allowing the surface of the sample to be detected to be contacted with water and bear pressure;

the water supply mechanism comprises a water inlet pipe communicated with the water storage cavity and a static water pressure supply pipe arranged on a branch of the water inlet pipe, wherein the pressure applied by water in the water storage cavity to a sample to be detected can be calculated through the height of the water level in the static water pressure supply pipe;

the positioning mechanism comprises a pressure plate for positioning the sample to be detected on the water storage cavity and a plurality of positioning units which are positioned on the periphery of the pressure plate and used for buckling and pressing the pressure plate on the water storage cavity;

the water supply mechanism also comprises a monitoring unit for monitoring the water level in the static water pressure supply pressure pipe and a processing unit for controlling the opening or closing of the electromagnetic valve, wherein the monitoring unit is communicated with the processing unit, the monitoring unit is in a power-off state when the water level does not rise to a preset position, the electromagnetic valve is automatically opened during water supply, the monitoring unit is electrified and started when the water level in the static water pressure supply pressure pipe rises to the preset position and transmits information to the processing unit, the processing unit gives a closing instruction to the electromagnetic valve, and the electromagnetic valve is automatically closed to stop water supply;

be equipped with the packing ring on the water storage chamber, wait to detect the sample and lay on the packing ring, positioning mechanism still includes the locating lever that upwards extends from the pressure disk middle part, extend and have the gag lever post that supplies locating lever upper portion to pass the hole along the diameter direction of pressure disk, and set up the limiting plate on the locating lever, wherein gag lever post both ends are connected with two positioning unit of relative both sides, when waiting to detect the sample location, the gag lever post level sets up, the bottom of the gag lever post of limiting plate conflict, make the periphery and the middle part of pressure disk all be in the stress state.

Preferably, the monitoring unit comprises a fixed electrode fixedly arranged in the static water pressure supply pressure pipe, a movable electrode which is positioned above the fixed electrode and can move up and down along the length direction of the static water pressure supply pressure pipe, a relay communicated with the fixed electrode and the movable electrode, and an adjusting component for adjusting the position of the movable electrode in the static water pressure supply pressure pipe, wherein the fixed electrode is arranged close to the electromagnetic valve, the relay is communicated with the processing unit, and when the rising water level contacts the movable electrode, the fixed electrode, the movable electrode and the relay form a closed loop. Thus, in this example, the water pressure is adjusted by moving the position of the electrodes to meet different pressure requirements.

Specifically, the fixed electrode is flush with the liquid level in the water storage cavity. So that the fixed electrode is in a submerged state.

According to a specific implementation and preferred aspect of the invention, the regulating assembly comprises a pulley member disposed at an upper portion of the static water pressure supply pipe; the driving piece is arranged on the base; a lead wire which is connected to the movable electrode by bypassing one end part of the pulley member and is connected to the driving member by the other end part.

Preferably, the driving member comprises a support positioned on the base, a rotating disc rotatably arranged on the support, and a rotating member for driving the rotating disc to rotate, wherein the conducting wire is wound on the rotating disc from the end part and is communicated with the relay circuit.

Specifically, the rotating member is a handle. The rotation of the handle realizes the rotation of the turntable, thereby realizing the height adjustment of the movable electrode.

Specifically, the pulley member is a fixed pulley positioned at the top of the static water pressure supply pipe.

According to a further embodiment and preferred aspect of the present invention, a manual control valve is further provided between the solenoid valve and the static water pressure supply pipe, and both the manual control valve and the solenoid valve are in an open state when water is supplied. The occurrence of accidents is prevented, and meanwhile, the manual control valve can be directly closed after the experiment is finished.

According to still another embodiment and preferred aspect of the present invention, the water supply mechanism further comprises an exhaust pipe communicated with the water storage chamber and used for exhausting gas in the water storage chamber; a control valve disposed on the exhaust pipe. The water supply is convenient to finish, and when the exhaust pipe is drained with water, the control valve is closed.

Preferably, the water supply mechanism further comprises a drain pipe which is communicated with the water storage cavity and is used for draining water in the water storage cavity; and the control valve is arranged on the water drainage pipe. After the experiment is finished, the water can be directly drained.

Preferably, an extension part horizontally extending outwards from the periphery is arranged at the top of the water storage cavity, and the plurality of positioning units are uniformly distributed on the extension part.

According to a further embodiment and preferred aspect of the present invention, the positioning unit includes a fixing base, a first rod rotatably disposed at one end thereof on the fixing base, a second rod disposed at the other end of the first rod and capable of being pressed against the periphery of the platen, and a positioning member for driving the first rod to rotate about the connecting end of the fixing base and pressing the lower end of the second rod against the platen.

Preferably, the positioning assembly comprises a third supporting rod which is rotatably arranged on the fixed seat from the lower end part and is intersected with the first supporting rod, a fourth supporting rod which is positioned between the third supporting rod and the first supporting rod and is rotatably connected with the third supporting rod and the first supporting rod at two end parts respectively, and a clamping block piece which is arranged on the fourth supporting rod and can relatively lock the fourth supporting rod and the first supporting rod, wherein when the third supporting rod is in a vertical state, the lower end part of the second supporting rod is pressed on the pressure plate, and the fourth supporting rod and the first supporting rod are locked by the clamping block piece.

Furthermore, the second supporting rod can move along the length direction of the second supporting rod and is arranged on the first supporting rod, and two end parts of the limiting rod are fixed on the second supporting rods on two symmetrical sides.

Preferably, a pressing block is further arranged at the lower end part of the second supporting rod, and a locking piece for locking the second supporting rod and the first supporting rod relatively is further arranged on the second supporting rod. In this application, be equipped with lock nut respectively in the junction of second branch and first branch pole.

According to another embodiment and preferred aspect of the present invention, the section of the fixing base is a right triangle, the right triangle is fixedly connected to the water storage chamber from a right side and the hypotenuse is disposed inward, the first leg is disposed at an acute angle of the top of the triangle by a first pivot, the third leg is disposed at another acute angle of the bottom of the triangle by a second pivot, and the third leg and the first leg are disposed at opposite sides of the right triangle.

Preferably, the first support arm comprises a first support arm and a second support arm which are perpendicular to each other, when the clamping block element is locked, the first support arm is flush with the other right-angle side of the right-angled triangle, and the second support arm is perpendicular to the third support arm.

According to a further embodiment and preferred aspect of the present invention, a positioning groove is provided on the water storage chamber, the gasket is positioned in the positioning groove, and the positioning mechanism further comprises an annular gasket provided between the gasket and the sample to be tested.

In addition, be equipped with connecting portion in the middle part of the pressure disk, the locating lever sets up on connecting portion from tip detachable down, passes the hole and extends along the length direction of stopper pole and be the slot hole, and the locating lever can remove in the slot hole.

The other technical scheme of the invention is as follows: the method for testing the waterproofness of the waterproof coiled material adopts the electric low-pressure testing device and comprises the following steps:

1) positioning a product to be detected on a water storage cavity, then sequentially laying filter paper, a moisture indicating mixture layer and the filter paper upwards, pressing a pressure plate on the uppermost layer of the filter paper, then operating a positioning unit, horizontally arranging a limiting rod, and enabling a limiting plate to abut against the bottom of the limiting rod, so that the periphery and the middle of the pressure plate are in a stressed state, and positioning is realized;

2) adjusting the monitoring unit and setting the height of the water level, opening the electromagnetic valve, introducing water into the water storage cavity, gradually raising the water level of the static water pressure supply pipe until the monitoring unit contacts the movable electrode, forming a closed circuit by the monitoring unit, transmitting information to the processor, sending an instruction to the electromagnetic valve by the processor, and automatically closing the electromagnetic valve to stop water supply;

3) observing whether water seeps from the surface of the pressure plate or not under the set time and constant pressure condition, and if the water seeps, indicating that the impermeability of the sample to be detected does not meet the requirement; and when no water seeps out, the positioning unit and the pressure plate are detached, the change of the filter paper and the moisture indicating mixture layer is observed, and the impermeability of the sample to be detected is further judged.

Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:

on one hand, the electromagnetic valve can automatically control the closing of the electromagnet according to the height of the water level in the static water pressure supply pipe, and automatically finish water supply; on the other hand, under the peripheral positioning of the pressure plate and the limiting of the middle part, the positioning of the sample to be detected is realized through the sealing connection of the gasket, the relative balance of the water pressure on the sample to be detected is ensured, and the accuracy of the detection result is improved.

Drawings

The invention is described in further detail below with reference to the figures and specific examples.

FIG. 1 is a schematic front view of an electrical low pressure testing device according to the present invention;

FIG. 2 is an enlarged schematic view of the positioning mechanism of FIG. 1;

FIG. 3 is a partial schematic view of the stop lever of FIG. 1;

wherein: 1. A base;

2. a water storage cavity; 20. positioning a groove; 21. an extension portion;

3. a water supply mechanism; 30. a water inlet pipe; 31. a static water pressure supply pipe; 32. an electromagnetic valve; 33. a monitoring unit; 330. a fixed electrode; 331. a movable electrode; 332. a relay; 333. an adjustment assembly; a. a pulley member (fixed pulley); b. a drive member; b1, a support; b2, a turntable; b3, a rotating member (handle); c. a wire; 34. a processing unit; 340. a processor; 35. an exhaust pipe; 36. a drain pipe; 37. a control valve; 38. A manual control valve;

4. a positioning mechanism; 40. a platen; 41. a positioning unit; 410. a fixed seat; 411. a first support bar; 4111. a first support arm; 4112. a second support arm; 412. a second support bar; 413. a positioning assembly; 4133. a third support bar; 4134. a fourth strut; 4135. a block member; 414. briquetting; 415. a locking member; 42. a gasket; 43. a gasket; 44. positioning a rod; 45. a limiting rod; 450. passing through the aperture; 46. a limiting plate; a1, a first pivot; a2, a second pivot;

and X, detecting a sample to be detected.

Detailed Description

As shown in fig. 1 to fig. 3, the electric low-pressure testing device for testing waterproofness of a waterproof roll of the present embodiment includes a base 1; the water storage cavity 2 is used for storing water and allowing the surface X of the sample to be detected to be contacted with water and bear pressure; the water supply mechanism 3 comprises a water inlet pipe 30 communicated with the water storage cavity 2 and a static water pressure supply pipe 31 arranged on a branch of the water inlet pipe 30, wherein the pressure applied by water in the water storage cavity 2 to the sample X to be detected can be calculated through the water level height in the static water pressure supply pipe 31; and the positioning mechanism 4 comprises a pressure plate 40 for positioning the sample X to be detected on the water storage cavity 2, and a plurality of positioning units 41 which are positioned on the periphery of the pressure plate 40 and used for buckling and pressing the pressure plate 40 on the water storage cavity 2.

Be equipped with the solenoid valve 32 between the entry of inlet tube 30 and static water pressure supply pipe 31, water supply mechanism 3 still includes the monitoring unit 33 of the interior water level of monitoring static water pressure supply pipe 31, a processing unit 34 for controlling solenoid valve 32 and opening or closed, wherein monitoring unit 33 is linked together with processing unit 34, and monitoring unit 33 is in the outage state when the water level does not rise to preset position, during the water supply, solenoid valve 32 is automatic to be opened, when water level rises to preset position in static water pressure supply pipe 31, monitoring unit 33 circular telegram starts, and to processing unit 34 transmission information, processing unit 34 assigns closed instruction to solenoid valve 32, solenoid valve 32 automatic closure stops the water supply.

In this embodiment, in order to realize the water supply detection, the water supply mechanism 3 further comprises an exhaust pipe 35 which is communicated with the water storage cavity 2 and is used for exhausting the gas in the water storage cavity 2; a drain pipe 36 which is communicated with the water storage cavity 2 and is used for draining water in the water storage cavity 2; and control valves 37 provided on the exhaust pipe 35 and the drain pipe 36, respectively. When water is supplied, the gas in the water storage chamber 2 is discharged through the exhaust pipe 35, and when water is discharged through the exhaust pipe 35, the control valve 37 is closed. After the experiment is completed, water can be directly drained from the drain pipe 36.

Meanwhile, a manual control valve 38 is further provided between the solenoid valve 32 and the static water pressure supply pipe 31, and both the manual control valve 38 and the solenoid valve 32 are in an open state when water is supplied. Preventing accidents while the manually controlled valve 38 can be closed directly after the experiment is completed.

Specifically, the monitoring unit 33 includes a fixed electrode 330 fixedly disposed in the static water pressure supply pipe 31, a movable electrode 331 located above the fixed electrode 330 and capable of moving up and down along the length direction of the static water pressure supply pipe 31, a relay 332 communicating with the fixed electrode 330 and the movable electrode 331, and an adjusting component 333 for adjusting the position of the movable electrode 331 in the static water pressure supply pipe 31, wherein the fixed electrode 330 is disposed close to the electromagnetic valve 32, the relay 332 communicates with the processing unit 34, and when the rising water level contacts the movable electrode 331, the fixed electrode 330, the movable electrode 331 and the relay 332 form a closed loop. Thus, in this example, the water pressure is adjusted by moving the position of the electrodes to meet different pressure requirements.

In this example, the fixed electrode 330 is disposed flush with the liquid surface in the water storage chamber 2. So that the fixed electrode 330 is in a submerged state, which also indicates that the pressure of the sample to be detected is zero.

The regulating member 333 includes a pulley member a provided at an upper portion of the static water pressure supply pipe 31; a driving member b provided on the base 1; a wire c passing through the pulley a and connected to the moving electrode 331 at one end and to the driver b at the other end.

The driving member b comprises a seat b1 positioned on the base 1, a rotating disc b2 rotatably arranged on the seat b1, and a rotating member b3 for driving the rotating disc b2 to rotate, wherein a conducting wire c is wound on the rotating disc b2 from the end and is in circuit communication with the relay 332.

Specifically, the rotating member b3 is a handle. By the rotation of the handle, the rotation of the turntable b2 is realized, and thus the height adjustment of the movable electrode 331 is realized.

Specifically, the pulley member a is a fixed pulley positioned on top of the static water pressure supply pipe 31.

The processing unit 34 includes a processor 340 connected between the solenoid valve 32 and the relay 332.

A gasket 42 is arranged on the water storage cavity 2, and the sample X to be detected is laid on the gasket 42.

Specifically, a positioning groove 20 is provided on the water storage chamber 2, and the gasket 42 is positioned in the positioning groove 20.

In this example, the positioning mechanism 4 further includes a ring-shaped spacer 43 disposed between the washer 42 of the washer 4 and the sample X to be detected, a positioning rod 44 extending upward from the middle of the pressure plate 40, a limiting rod 45 extending along the diameter direction of the pressure plate 40 and having a hole 450 for passing the upper portion of the positioning rod 44, and a limiting plate 46 disposed on the positioning rod 44, wherein two end portions of the limiting rod 45 are connected to the two positioning units 41 on two opposite sides, when the sample X to be detected is positioned, the limiting rod 45 is disposed horizontally, the limiting plate 46 abuts against the bottom of the limiting rod 45, so that the periphery and the middle portion of the pressure plate 40 are both in a stressed state.

Be equipped with connecting portion 400 in pressure disk 40 middle part, locating lever 44 sets up on connecting portion 400 from lower tip detachable, and the length direction that passes hole 450 along gag lever post 45 extends and is the slot hole, and locating lever 44 can remove in the slot hole.

An extension part 21 horizontally extending outwards from the periphery is arranged at the top of the water storage cavity 2, and a plurality of positioning units 41 are uniformly distributed on the extension part 21.

The positioning unit 41 includes a fixing base 410, a first supporting rod 411 having one end rotatably disposed on the fixing base 410, a second supporting rod 412 disposed at the other end of the first supporting rod 411 and capable of pressing against the periphery of the pressure plate 40, and an adjusting assembly 333 for driving the first supporting rod 411 to rotate around the connecting end of the fixing base 410 and enabling the lower end of the second supporting rod 412 to press against the pressure plate 40.

The adjusting assembly 333 includes a third strut 4133 rotatably disposed on the fixing base 410 from the lower end and intersecting the first strut 411, a fourth strut 4134 disposed between the third strut 4133 and the first strut 411 and having two ends rotatably connected to the third strut 4133 and the first strut 411, and a latch 4135 disposed on the fourth strut 4134 and capable of locking the fourth strut 4134 and the first strut 411 relatively, wherein when the third strut 4133 is in the vertical state, the lower end of the second strut 412 is pressed against the pressure plate 40, and the latch 4135 locks the fourth strut 4134 and the first strut 411.

The second support bar 412 is movably adjusted along the length direction thereof and is disposed on the first support bar 411, and both ends of the stopper rod 45 are fixed to the second support bars 412 at two opposite sides.

A pressing piece 414 is further provided at the lower end of the second rod 412, and a locking piece 415 for locking the second rod 412 and the first rod 411 relative to each other is further provided on the second rod 412. In this application, a lock nut is respectively disposed at the connection position of the second support rod 412 and the first support rod 411.

The section of the fixing base 410 is a right triangle, the right triangle is fixedly connected to the water storage cavity 2 from a right angle side, the bevel edge is arranged inwards, the first supporting rod 411 is arranged at an acute angle at the top of the triangle in a rotating manner through a first pivot a1, the third supporting rod 4133 is arranged at another acute angle at the bottom of the triangle in a rotating manner through a second pivot a2, and the third supporting rod 4133 and the first supporting rod 411 are arranged at two opposite sides of the right triangle.

The first leg 411 includes a first leg 4111 and a second leg 4112 that are perpendicular to each other, such that when the latch member 4135 is locked, the first leg 4111 is flush with the other leg of the right triangle, and the second leg 4112 is perpendicular to the third leg 4133.

In addition, in the present application, the gasket 42 is a flexible material in the shape of a circular cylinder, and is used to ensure that the sample to be tested is sealed with the device; the gasket 43 is an annular flexible sheet that is positioned between the material and the gasket to protect the material from damage when the material is relatively brittle.

The detection steps of this embodiment are as follows:

1) firstly, placing a sample to be detected on a gasket, then sequentially upwards laying filter paper, a moisture indicating mixture layer and the filter paper, pressing a pressure plate on the uppermost layer of the filter paper, then operating a positioning unit to enable a third support rod to be vertically arranged with a second support arm when a clamping block piece is locked, enabling a pressing block at the bottom of the second support rod to be pressed at the periphery of the pressure plate, enabling a limiting rod to be in a horizontal state, enabling a limiting plate to abut against the bottom of the limiting rod, and enabling the periphery and the middle of the pressure plate to be in a stressed state to achieve positioning;

2) setting the height of the movable electrode through the rotation of the turntable, simultaneously opening a control valve on the exhaust pipe, closing the control valve on the drain pipe, then opening a manual control valve and an electromagnetic valve, starting water supply into the water storage cavity, closing the control valve on the exhaust pipe until water flows out of the exhaust pipe, gradually increasing the water level of the static water pressure supply pipe at the moment, forming a closed circuit by the monitoring unit until the monitoring unit contacts the movable electrode, transmitting information to the processor, issuing an instruction to the electromagnetic valve by the processor, and automatically closing the electromagnetic valve to stop water supply;

3) observing whether water seeps from the surface of the pressure plate or not under the set time and constant pressure condition, and if the water seeps, indicating that the impermeability of the sample to be detected does not meet the requirement; and when no water seeps out, the positioning unit and the pressure plate are detached, the change of the filter paper and the moisture indicating mixture layer is observed, and the impermeability of the sample to be detected is further judged.

The present invention has been described in detail in order to enable those skilled in the art to understand the invention and to practice it, and it is not intended to limit the scope of the invention, and all equivalent changes and modifications made according to the spirit of the present invention should be covered by the present invention.

Claims (10)

1. The utility model provides an electronic low pressure testing arrangement that waterproofing membrane imperviousness test was used, its includes:

a base;

the water storage cavity is used for storing water and allowing the surface of the sample to be detected to be contacted with water and bear pressure;

the water supply mechanism comprises a water inlet pipe communicated with the water storage cavity and a static water pressure supply pipe arranged on a branch of the water inlet pipe, wherein the pressure applied by water in the water storage cavity to a sample to be detected can be calculated through the height of the water level in the static water pressure supply pipe;

the positioning mechanism comprises a pressure plate for positioning a sample to be detected on the water storage cavity and a plurality of positioning units which are positioned on the periphery of the pressure plate and used for buckling and pressing the pressure plate on the water storage cavity;

the method is characterized in that:

the water supply mechanism also comprises a monitoring unit for monitoring the water level in the static water pressure supply pipe and a processing unit for controlling the opening or closing of the electromagnetic valve, wherein the monitoring unit is communicated with the processing unit, the monitoring unit is in a power-off state when the water level is not raised to a preset position, the electromagnetic valve is automatically opened during water supply, the monitoring unit is electrified and started and transmits information to the processing unit when the water level in the static water pressure supply pipe is raised to the preset position, the processing unit gives a closing instruction to the electromagnetic valve, and the electromagnetic valve is automatically closed to stop water supply;

be equipped with the packing ring on the water storage chamber, wait to detect the sample and lay on the packing ring, positioning mechanism still include certainly pressure disk middle part upwards extends the locating lever, along the diameter direction of pressure disk extends and has the confession locating lever upper portion passes the gag lever post of hole and sets up limiting plate on the locating lever, wherein gag lever post both ends and two of relative both sides the positioning unit be connected, when waiting to detect sample location, the gag lever post level set up, the limiting plate conflict the bottom of gag lever post makes the periphery and the middle part of pressure disk all are in the stress state.

2. The electric low-pressure testing device for testing the water impermeability of the waterproof roll material according to claim 1, wherein: the monitoring unit comprises a fixed electrode fixedly arranged in the static water pressure supply pressure pipe, a movable electrode which is positioned above the fixed electrode and can move up and down along the length direction of the static water pressure supply pressure pipe, a relay communicated with the fixed electrode and the movable electrode, and an adjusting component for adjusting the position of the movable electrode in the static water pressure supply pressure pipe, wherein the fixed electrode is close to the electromagnetic valve, the relay is communicated with the processing unit, and when the rising water level contacts the movable electrode, the fixed electrode, the movable electrode and the relay form a closed loop.

3. The electric low-pressure testing device for testing the water impermeability of the waterproof roll material according to claim 2, wherein: the fixed electrode is flush with the liquid level in the water storage cavity.

4. The electric low-pressure testing device for testing the water impermeability of the waterproof roll material according to claim 2, wherein: the regulating assembly comprises a pulley piece arranged on the upper part of the static water pressure supply pipe; the driving piece is arranged on the base; and a lead wire which bypasses one end part of the pulley piece and is connected to the movable electrode and the other end part of the pulley piece is connected to the driving piece.

5. The electric low pressure testing device for waterproof coiled material impermeability test of claim 4, characterized in that: the driving piece comprises a support positioned on the base, a rotary disc rotatably arranged on the support and a rotating piece used for driving the rotary disc to rotate, wherein the conducting wire is wound on the rotary disc from the end part and is communicated with the relay circuit.

6. The electric low-pressure testing device for testing the water impermeability of the waterproof roll material according to claim 1, wherein: the water supply mechanism also comprises an exhaust pipe which is communicated with the water storage cavity and is used for exhausting gas in the water storage cavity; the water discharge pipe is communicated with the water storage cavity and is used for discharging water in the water storage cavity; and the control valves are respectively arranged on the exhaust pipe and the water discharge pipe.

7. The electric low-pressure testing device for testing the water impermeability of the waterproof roll material according to claim 1, wherein: the top in water storage chamber be equipped with the extension of outside horizontal extension from periphery, it is a plurality of positioning unit evenly distributed be in the extension on, positioning unit include fixing base, one end rotate the setting and be in the fixing base on first branch, set up first branch another tip and can press to the peripheral second branch of pressure disk and drive first branch round fixing base connection end rotates and makes the lower tip of second branch compresses tightly locating component on the pressure disk.

8. The electric low pressure testing device for waterproof coiled material impermeability test of claim 7, characterized in that: the locating component comprises a third supporting rod, a clamping block piece and a second supporting rod, wherein the third supporting rod is rotatably arranged on the fixed seat from the lower end part, the third supporting rod is arranged on the first supporting rod in a rotating mode, the third supporting rod is located between the third supporting rod and the first supporting rod, two end parts of the third supporting rod are respectively connected with the third supporting rod and the first supporting rod in a rotating mode, the fourth supporting rod is arranged on the fourth supporting rod and can be locked with the first supporting rod relatively, when the third supporting rod is in a vertical state, the lower end part of the second supporting rod is pressed on the pressure plate, and the clamping block piece is used for locking the fourth supporting rod with the first supporting rod.

9. The electric low pressure testing device for waterproof coiled material impermeability test of claim 7 or 8, characterized in that: the second supporting rod can be movably adjusted along the length direction of the second supporting rod and is arranged on the first supporting rod, and two end parts of the limiting rod are fixed on the second supporting rods on two symmetrical sides.

10. A waterproof coiled material impermeability test method is characterized in that: the method employs an electrical low pressure test device as claimed in any one of claims 1 to 9, comprising the steps of:

1) positioning a product to be detected on a water storage cavity, then sequentially laying filter paper, a moisture indicating mixture layer and the filter paper upwards, pressing a pressure plate on the uppermost layer of the filter paper, then operating a positioning unit, horizontally arranging a limiting rod, and enabling a limiting plate to abut against the bottom of the limiting rod, so that the periphery and the middle of the pressure plate are in a stressed state, and positioning is realized;

2) adjusting the monitoring unit and setting the height of the water level, opening the electromagnetic valve, introducing water into the water storage cavity, gradually raising the water level of the static water pressure supply pipe until the monitoring unit contacts the movable electrode, forming a closed circuit by the monitoring unit, transmitting information to the processor, sending an instruction to the electromagnetic valve by the processor, and automatically closing the electromagnetic valve to stop water supply;

3) observing whether water seeps from the surface of the pressure plate or not under the set time and constant pressure condition, and if the water seeps, indicating that the impermeability of the sample to be detected does not meet the requirement; and when no water seeps out, the positioning unit and the pressure plate are detached, the change of the filter paper and the moisture indicating mixture layer is observed, and the impermeability of the sample to be detected is further judged.

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