CN113720746B - Device and method for testing permeability of penetrating agent in fiber cloth - Google Patents

Abstract

The invention discloses a device for testing the permeability of a penetrant in a fiber cloth, comprising a workbench, and a fiber cloth unwinding mechanism is sequentially fixed on the top surface of the workbench, which is used for the fixed-length unwinding of the fiber cloth, and realizes Continuous supply of test materials; punching and cutting mechanism, used for punching and cutting the top surface of the unrolled fiber cloth to achieve unit length interception of test materials; sealing device, used for punching and cutting The sealing and clamping of the fiber cloth, the interior of which is connected to the vacuuming machine through a hose to realize the creation of a vacuum and low-pressure environment inside the sealing device; and the penetrant supply device, which is used for the storage and heating of the penetrant, and the interior of which is connected to the sealing device through a hose. The internal communication of the device realizes the automatic supply of the penetrant into the sealing device under the action of the pressure difference. The invention can realize the quick and repeated use of the sealing device, establish a treatment scheme for testing the permeability of the resin at different temperatures, and can realize the accurate measurement of the permeability of the resin in the longitudinal and transverse directions.

Description

Test device and test method for permeability of penetrant in fiber cloth

technical field

The invention relates to the technical field of composite material performance testing, in particular to a device and a testing method for the permeability of a penetrant in a fiber cloth.

Background technique

Advanced resin-based composite materials have been widely used in social life due to their unique advantages such as high specific strength and specific stiffness, strong designability, good fatigue resistance, and good corrosion resistance. With the increase in the amount of composite structural parts, people's requirements for their performance are also increasing. As the key to the performance of structural parts, the molding process method and process parameters have received extensive attention. The permeability of the resin in the fiber bundle is A crucial process parameter that affects the overall glue content of composite structures. Therefore, measuring the permeability of resin in fiber bundles is one of the essential process parameters when designing and processing composite materials.

However, at present, the measurement of the permeability of resin in carbon fiber bundles mostly adopts artificial temporary construction of test benches, the quality of construction is uneven, the construction process is time-consuming and laborious, and requires the cooperation of many people; the components of the sealing device are usually sealed with putty strips. As a result, the sealing device needs to be re-cleaned and arranged every time it is used, which is cumbersome to operate and wastes resources. The most important thing is that the existing artificially built test platform can only measure the permeability of resin in fiber bundles at a single room temperature, and it is difficult to measure the permeability of resin in fiber bundles at different temperatures, and cannot be comprehensively evaluated. Penetration of resin in fiber bundles. Therefore, designing a resin permeability test device that can measure different temperatures has become one of the key issues to be solved to improve the level of composite structure design and manufacturing.

SUMMARY OF THE INVENTION

The device for testing the permeability of the penetrant in the fiber cloth proposed by the invention adopts grooves and rubber rings to replace the traditional putty strip sealing in the sealing device, so as to realize the quick and repeated use of the sealing device, and has electric heating function and temperature by setting The penetrant supply device with monitoring function improves the current situation of low efficiency in testing the permeability of manual penetrant placement, and establishes a treatment plan for testing the permeability of the resin at different temperatures, which can realize the permeability of the resin in both vertical and horizontal directions. Accurate measurement.

In order to solve the above-mentioned technical problems, a technical solution adopted in the present invention is to provide a device for testing the permeability of a penetrant in a fiber cloth, including a workbench, and the top surface of the workbench is sequentially fixed with

The fiber cloth unwinding mechanism is used for the fixed length unwinding of the fiber cloth to realize the continuous supply of test materials;

The punching and cutting mechanism is used for punching and cutting the top surface of the unrolled fiber cloth to realize the unit length interception of the test material;

The sealing device is used for the sealing and clamping of the punched and cut fiber cloth, and the interior of the sealing device is connected with a vacuum machine through a hose, so as to realize the creation of a vacuum and low-pressure environment inside the sealing device; and

The penetrant supply device is used for storage and heating of the penetrant, and its interior is communicated with the interior of the sealing device through a hose, so as to realize the automatic supply of the penetrant into the sealing device under the action of pressure difference.

Further, the fiber cloth unwinding mechanism includes a winding roller arranged on the top surface of the worktable, a pair of rollers located on the output side of the winding roller, and a drive motor connected to the end of the rotating shaft of the pair of rollers. The ends of the fiber cloth on the rollers are clamped in the pair of rollers.

Further, the sealing device includes a base plate fixed on the top surface of the workbench, a support rod fixedly connected to the four corners of the top surface of the base plate, a sealing frame slidably connected to the support rod and located just above the base plate, and slidably connected to the support rod. And the top plate directly above the sealing frame, the sealing frame and the bottom plate and the top plate and the sealing frame are all detachably sealed connection.

Further, a sealing ring is fixed on the top surface of the frame edge and the bottom surface of the frame edge of the sealing frame, and a sealing groove corresponding to the sealing ring is formed on the top surface of the bottom plate and the bottom surface of the top plate.

Further, a plurality of air extraction holes are evenly opened on the side of the frame of the sealing frame, and each air extraction hole is connected to the vacuum machine through a hose.

Further, the top plate is made of transparent material, and a through hole is opened in the center of the top surface.

Further, the top surface of the top plate is provided with a scale line located outside the through hole, and the bottom surface of the top surface is provided with an annular putty strip located outside the through hole.

Further, the penetrant supply device includes a glue tank, an electromagnetic heating coil arranged on the bottom surface of the inner wall of the glue tank, and a stirring device arranged inside the glue tank, and a two-way valve is fixed at the bottom of the side of the glue tank. The two-way valve communicates with the through hole in the top plate through a hose.

Further, a temperature monitoring device is also arranged in the glue tank.

At the same time, a method for testing the permeability of resin in fiber cloth at different temperatures based on the permeability testing device is provided, which mainly includes the following steps:

S10: Continuously unwind the fiber cloth to the preset length through the fiber cloth unwinding mechanism, and then the fiber cloth unwinding mechanism suspends the work;

S20: During the continuous unwinding of the fiber cloth, the top hole is punched in the middle position of the fiber cloth by the punching and cutting mechanism, and the cutting of the fiber cloth is completed after the vacuum unwinding mechanism is suspended;

S30: Adjust the sealing frame of the sealing device to the lowest position and sealingly connect it with the bottom plate, and fix the sealing frame; place the punched and cut fiber cloth on the top of the sealing frame, and adjust the placement position of the fiber cloth; A putty strip is pasted at the hole, and the position of the top plate is adjusted to be sealed with the top surface of the sealing frame; at this time, the putty strip is sealed with the opening on the top of the fiber cloth, and the surrounding edges of the fiber cloth are clamped between the top plate and the sealing frame. between;

S40: Start the vacuum pump to make the air pressure inside the sealing device reach the preset test pressure value, and then close the vacuum pump to test whether the sealing device can maintain pressure;

S50: The penetrant stored in the glue tank is heated and stirred evenly to the preset test temperature by the penetrant supply device;

S60: Open the two-way valve on the penetrant supply device to make the inside of the penetrant supply device communicate with the inside of the sealing device, then the penetrant in the glue tank flows into the sealing device under the action of the pressure difference and gradually flows in the fiber cloth. penetration;

S70: Observe the penetration of the penetrant to the fiber cloth to be tested under the specified pressure through the top plate, read the position of the flow front of the penetrant from the scale on the top plate and record the corresponding value, and then calculate the penetrant by the formula. The permeability in the object to be tested under a certain temperature and a certain pressure value;

S80: Reset the heating temperature of the penetrant or the negative pressure value in the sealing device, and repeat steps S10 to S70 to complete the acquisition of multiple sets of test data.

Compared with the prior art, the beneficial effects of the present invention are as follows:

(1) The present invention adopts a detachable sealing device structure, and adopts grooves and rubber rings to replace the traditional putty strip sealing between the assembled parts, so as to realize the quick and repeated use of the sealing device, the operation is more convenient, and the putty is effectively saved. The amount of strips used can reduce the test cost; the transparent top plate with engraved scale can more conveniently and intuitively observe the flow of resin in the object to be tested and the real-time penetration position, which is convenient for more accurate calculation of the permeability;

(2) The present invention improves the current situation of inefficiency in manually laying the penetrant to test the permeability by setting a penetrant supply device with an electric heating function and a temperature monitoring function, and simultaneously establishes a system for testing the permeability under different temperatures of the resin. The treatment plan can realize the accurate measurement of the permeability of the resin in both longitudinal and transverse directions, and can more accurately and comprehensively evaluate the permeability of the penetrant.

Description of drawings

Fig. 1 is a three-dimensional schematic diagram of the present invention in an untested use state;

Fig. 2 is the three-dimensional structure schematic diagram that the present invention uses in testing;

FIG. 3 is a schematic diagram of the three-dimensional structure of the glue tank according to the present invention;

FIG. 4 is a schematic three-dimensional structure diagram of a position adjusting member used in the sealing device according to the present invention.

In the figure: 1 worktable, 2 fiber cloth unwinding mechanism, 3 punching and cutting mechanism, 4 sealing device, 41 bottom plate, 42 support rod, 43 sealing frame, 44 top plate, 5 penetrant supply device, 51 glue tank, 52 electromagnetic Heating coil, 53 two-way valve, 54 stirring device, 6 position adjusting piece, 61 pin, 62 elastic band, 63 supporting plate.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the protection scope of the present invention can be more clearly defined.

The technical solution of the present invention is described in detail below with resin as the penetrant and carbon fiber cloth with a vacuum bag structure as the test material.

Please refer to Fig. 1 and Fig. 2 , a device for testing the permeability of penetrant in fiber cloth, including a workbench 1, and the workbench 1 is a general frame-type workbench structure formed by welding metal profiles.

The left end of the top surface of the workbench 1 is fixedly provided with a fiber cloth unwinding mechanism 2, which is used for the fixed-length unwinding of the fiber cloth and realizes the continuous supply of test materials. The fiber cloth unwinding mechanism 2 adopts a general cloth unwinding mechanism, including a winding roller arranged on the top surface of the worktable 1, a pair of rollers (not shown in the figure) on the output side of the winding roller, and a pair of rollers. A drive motor (not shown in the figure) is driven and connected at the end of the rotating shaft, and the end of the fiber cloth wound on the roll is clamped in the pair of rollers. Among them, the fiber cloth to be tested is wound on the roll; the pair of rolls is arranged on the right side of the roll, including upper and lower rollers, and the vertical distance between the two rollers is adjustable, and the fiber cloth is Clamped between two rollers, when the two rollers rotate to the rollers, the fiber cloth is continuously unrolled from the rollers and sent out; the driving motor adopts a stepping motor or a servo motor, and the pair of rollers is driven by the synchronous belt transmission mechanism It is easy to precisely control the number of turns of the pair of rollers, so that the length of the fiber cloth drawn and spread by the pair of rollers can be precisely controlled.

The top surface of the worktable 1 is fixedly installed with a punching and cutting mechanism 3 located on the right side of the fiber cloth unwinding mechanism 2, which is used for punching and fixed-length cutting on the top surface of the unrolled fiber cloth to realize the unit length of the test material. intercept. Among them, the punching and cutting mechanism 3 adopts the existing cutting mechanism, including a gantry bracket, a punching mechanism (not shown in the figure) fixed in the middle position of the top of the gantry bracket, and a cutting knife (not shown in the figure) fixed on the side of the gantry bracket. not shown). In the process of continuous unwinding of the fiber cloth, when the unwinding length is half of the preset unit length, the punching mechanism starts to work, and the upper layer fibers of the fiber cloth of the vacuum bag structure are punched to realize the subsequent penetration agent. The input channel mouth; when the unwinding length reaches the preset unit length, the fiber cloth unwinding mechanism 2 suspends the operation, and the cutting guillotine moves quickly under the drive of its power unit to complete the cutting of the fiber cloth, thereby making The fiber cloth unit to be tested with the same specification.

The top surface of the worktable 1 is fixedly installed with a sealing device 4 with the punching and cutting mechanism 3 located on the right side, which is used for the sealing and clamping of the punched and cut fiber cloth. The sealing device 4 includes a base plate 41 fixed on the top surface of the workbench 1, support rods 42 fixedly connected to the four corners of the top surface of the base plate 41, a sealing frame 43 slidably connected to the support rod 42 and located just above the base plate 41, and slidably connected to the base plate 41. The top plate 44 on the support rod 42 and located just above the sealing frame 43 . Wherein, a position adjusting member 6 is fixed on each of the four corner sides of the sealing frame 43 and the top plate 44 , so that the positions of the sealing frame 43 and the top plate 44 on the support frame 42 can be adjusted. As shown in FIG. 4 , the position adjusting member 6 adopts a spring pin structure, including a support plate 63 sleeved on the support frame 42, a pin 61 movably inserted into the side wall of the support plate 63, connecting the support plate 63 and the pin 61 The elastic band 62. The cylindrical surface of the support rod 42 is provided with a plurality of evenly distributed slots (not shown in the figure) along the vertical direction. When the pin 61 is pulled out, the elastic band 62 is stretched and stored, and the support plate 63 can be pulled out. Slide up and down along the support rod 42 to adjust the position of the sealing frame 43/top plate 44 on the support rod 42; when the pin 61 is released, it is reinserted into the slot of the support rod 42 under the action of the elastic band 62's own restoring force Inside, the sealing frame 43/top plate 44 is fixed after adjusting the position. Obviously, other positioning mechanisms can also be used to realize the position adjustment and positioning functions of the position adjustment member in this embodiment.

The sealing frame 43 and the bottom plate 41 and the top plate 44 and the sealing frame 43 are all detachably sealed. In this embodiment, the sealing ring of rubber material (not shown in the figure) is fixedly arranged on the top surface of the frame edge and the bottom surface of the frame edge of the sealing frame 43, and the top surface of the bottom plate 41 and the bottom surface of the top plate 44 are both provided with The corresponding sealing groove of the sealing ring (not shown in the figure). When the sealing frame 43 moves down to the lowest position, the sealing ring on the bottom surface is embedded in the sealing groove on the top surface of the bottom plate 41 to realize the automatic sealing connection between the sealing frame 43 and the bottom plate 41; when the top plate 44 descends to the sealing frame 43 When the top surface is at the top position, the sealing ring on the top surface of the sealing frame 43 is embedded in the sealing groove on the bottom surface of the top plate 44 to realize the automatic sealing connection between the sealing frame 43 and the top plate 44, then the bottom plate 41, the sealing frame 43 and the top plate 44 constitute hermetic space. At the same time, in the process of fitting and sealing the top plate 44 and the sealing frame 43, the end and the ends of the fiber cloth are also pressed into the sealing groove, so as to realize the fixing and sealing of the fiber cloth in the sealing device.

The side of the frame of the sealing frame 43 is evenly provided with a number of air extraction holes, and each air extraction hole is connected to the vacuuming machine through a hose. The air in the sealing device 4 can be evacuated by the vacuuming machine, so that the airtight space inside the sealing device 4 can reach a preset pressure value, so as to realize the creation of a vacuum and low-pressure environment inside the sealing device 4 . The top plate 44 is made of transparent material, and the center of the top surface is provided with a through hole as large as the opening opened on the top of the fiber cloth. The top plate 44 can visually observe the real-time conditions inside the sealing device 4, which is convenient to record the penetration process of the penetrant on the fiber cloth, thereby improving the accuracy of the later calculation structure; the penetrant on the fiber cloth can be read intuitively through the scale line. The final penetration result.

The bottom surface of the top plate 44 is provided with an annular putty strip (not shown in the figure) located on the outside of the through hole, then in the process of fitting the top plate 44 and the sealing frame 43, the annular putty strip can not only realize the bonding of the fiber cloth in the sealing device. Fixing and sealing, at the same time, the sealing connection between the through hole on the top plate 44 and the through opening on the fiber cloth can be completed, thereby constructing a channel for the penetrant to enter the interior of the fiber cloth from the outside of the sealing device 4 .

The penetrant supply device 5 is used for storage and heating of the penetrant, and its interior is communicated with the interior of the sealing device 4 through a hose, so as to realize the automatic supply of the penetrant into the sealing device 4 under the action of the pressure difference. As shown in FIG. 3 , the penetrant supply device 5 includes a glue tank 51 , an electromagnetic heating coil 52 disposed on the bottom surface of the inner wall of the glue tank 51 , and a stirring device 54 disposed inside the glue tank 51 . Among them, the glue tank 51 is used to store the penetrant (such as resin), and the penetrant in the glue tank 51 can be heated by the electromagnetic heating coil 52 to meet the test requirements; the stirring device 54 is arranged at the center of the electromagnetic heating coil 52, The main purpose is to ensure uniform heating, so any suitable structure can be adopted, preferably an electric stirring mechanism.

A two-way valve 53 is fixed at the bottom of the side of the glue tank 51. The two-way valve 53 is connected to the through hole on the top plate 44 through a hose. When the two-way valve 53 is closed, the sealing device 4 is in a closed state, which can realize pressure maintenance. Test; when the sealing device 4 has good sealing performance, after opening the two-way valve 53, the heated liquid resin in the glue tank 51 flows into the sealing device 4 under the action of the pressure difference and enters the interior of the fiber cloth, thereby starting the permeation process.

Further, a temperature monitoring device (not shown in the figure) is also provided in the glue tank 51, which can monitor the temperature of the penetrant in the glue tank 51 in real time, so as to automatically adjust the heating power and heating time of the electromagnetic heating coil 52 to keep the temperature of the penetrant in the glue tank 51. The temperature of the penetrant. At the same time, different heating temperatures can be set through the temperature monitoring device to meet the needs of different temperature tests.

The method for testing the permeability of the penetrant in the fiber cloth based on the permeability testing device mainly includes the following steps:

S10: Continuously unwind the fiber cloth to the preset length through the fiber cloth unwinding mechanism, and then the fiber cloth unwinding mechanism stops working; the preset length can be determined according to the actual test needs, and the length parameter is converted into the corresponding driving motor through the control program The number of driving pulses to achieve automatic adjustment and adaptation;

S20: During the continuous unwinding of the fiber cloth, the top hole is punched in the middle position of the fiber cloth by the punching and cutting mechanism, and the cutting of the fiber cloth is completed after the vacuum unwinding mechanism is suspended;

S30: Adjust the sealing frame of the sealing device to the lowest position and sealingly connect it with the bottom plate, and fix the sealing frame; place the punched and cut fiber cloth on the top of the sealing frame, and adjust the placement position of the fiber cloth; A putty strip is pasted at the hole, and the position of the top plate is adjusted to be sealed with the top surface of the sealing frame; at this time, the putty strip is sealed with the opening on the top of the fiber cloth, and the surrounding edges of the fiber cloth are clamped between the top plate and the sealing frame. between;

S40: Start the vacuum pump to make the air pressure inside the sealing device reach the preset test pressure value, and then close the vacuum pump to test whether the sealing device can maintain pressure;

S50: The penetrant stored in the glue tank is heated and stirred evenly to the preset test temperature by the penetrant supply device;

S60: Open the two-way valve on the penetrant supply device to make the inside of the penetrant supply device communicate with the inside of the sealing device, then the penetrant in the glue tank flows into the sealing device under the action of the pressure difference and gradually flows in the fiber cloth. penetration;

S70: Observe the penetration of the penetrant to the fiber cloth to be tested under the specified pressure through the top plate, read the position of the flow front of the penetrant from the scale on the top plate and record the corresponding value, and then pass the formula (such as Darcy's law of velocity formula) to calculate the permeability of the penetrant in the object to be tested under a certain temperature and a certain pressure value;

S80: Reset the heating temperature of the penetrant or the negative pressure value in the sealing device, and repeat steps S10 to S70 to complete the acquisition of multiple sets of test data.

The above descriptions are only the embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related technologies Fields are similarly included in the scope of patent protection of the present invention.

Claims (10)

1. a permeability testing device of a penetrant in a fiber cloth, comprising a workbench (1), characterized in that: the top surface of the workbench (1) is sequentially fixed with a fiber cloth unwinding mechanism (2), It is used for fixed-length unwinding of the fiber cloth to realize continuous supply of test materials; the punching and cutting mechanism (3) is used for punching and fixed-length cutting on the top surface of the unrolled fiber cloth to realize the unit length of the test material Interception; sealing device (4), used for sealing and clamping of the fiber cloth after punching and cutting, the interior of which is connected with a vacuum machine through a hose to realize the creation of a vacuum and low-pressure environment inside the sealing device (4). The sealing device (4) comprises a top plate (44), a center of the top surface of the top plate (44) is provided with a through hole, the bottom surface of the top plate (44) is provided with an annular putty strip outside the through hole, and the putty strip can be connected with the top of the fiber cloth. and the penetrant supply device (5) for storage and heating of the penetrant, the interior of which is communicated with the interior of the sealing device (4) through a hose, so that the penetrant can be supplied to the sealing device under the action of the pressure difference. (4) Automatic supply within. 2. The device for testing the permeability of penetrant in fiber cloth according to claim 1, characterized in that: the fiber cloth unwinding mechanism (2) comprises a rolling roller rotatably arranged on the top surface of the workbench (1). , The pair of rollers located on the output side of the winding roller, the drive motor connected to the end of the rotating shaft of the pair of rollers, and the end of the fiber cloth wound on the roller is clamped in the pair of rollers. 3. The permeability testing device of penetrant in fiber cloth according to claim 1, characterized in that: the sealing device (4) further comprises a bottom plate (41) fixed on the top surface of the workbench (1), The support rods (42) are fixedly connected to the four corners of the top surface of the bottom plate (41), and the sealing frame (43) is slidably connected to the support rods (42) and located directly above the bottom plate (41). The top plate (44) is slidably connected to the The support rod (42) is located directly above the sealing frame (43), and the sealing frame (43) and the bottom plate (41) and the top plate (44) and the sealing frame (43) are all detachably sealed connection . 4. The permeability testing device of penetrant in fiber cloth according to claim 3, wherein the sealing ring is fixedly arranged on the top surface of the frame edge and the bottom surface of the frame edge of the sealing frame (43). The top surface of the bottom plate (41) and the bottom surface of the top plate (44) are both provided with a sealing groove corresponding to the sealing ring. 5. The permeability testing device of penetrant in fiber cloth according to claim 3, characterized in that: the frame side of the sealing frame (43) is evenly provided with a number of air extraction holes, and each air extraction hole passes through soft The tube is connected to the vacuum pump. 6 . The device for testing the permeability of penetrants in fiber cloth according to claim 3 , wherein the top plate ( 44 ) is made of transparent material. 7 . 7 . The device for testing the permeability of penetrant in fiber cloth according to claim 6 , wherein the top surface of the top plate ( 44 ) is provided with a scale line located outside the through hole. 8 . 8. The permeability testing device of penetrant in fiber cloth according to claim 6, characterized in that: the penetrant supply device (5) comprises a glue tank (51), and is arranged on the bottom surface of the inner wall of the glue tank (51). The electromagnetic heating coil (52) on the plastic tank (52), the stirring device arranged inside the glue tank (51), the side bottom of the glue tank (51) is fixedly provided with a two-way valve (53), and the two-way valve (53) passes through The hose communicates with the through hole on the top plate (44). 9 . The device for testing the permeability of penetrants in fiber cloth according to claim 8 , wherein a temperature monitoring device is further provided in the glue tank ( 51 ). 10 . 10. A method for measuring the permeability of resin in the fiber cloth at different temperatures based on the described permeability testing device of claim 1-8, characterized in that: it mainly comprises the following steps: S10: Continuously unwind the fiber cloth to the preset length through the fiber cloth unwinding mechanism, and then the fiber cloth unwinding mechanism suspends the work; S20: During the continuous unwinding of the fiber cloth, the top hole is punched in the middle position of the fiber cloth by the punching and cutting mechanism, and the cutting of the fiber cloth is completed after the vacuum unwinding mechanism is suspended; S30: Adjust the sealing frame of the sealing device to the lowest position and sealingly connect it with the bottom plate, and fix the sealing frame; place the punched and cut fiber cloth on the top of the sealing frame, and adjust the placement position of the fiber cloth; A putty strip is pasted at the hole, and the position of the top plate is adjusted to be sealed with the top surface of the sealing frame; at this time, the putty strip is sealed with the opening on the top of the fiber cloth, and the surrounding edges of the fiber cloth are clamped between the top plate and the sealing frame. between; S40: Start the vacuum pump to make the air pressure inside the sealing device reach the preset test pressure value, and then close the vacuum pump to test whether the sealing device can maintain pressure; S50: The penetrant stored in the glue tank is heated and stirred evenly to the preset test temperature by the penetrant supply device; S60: Open the two-way valve on the penetrant supply device to make the inside of the penetrant supply device communicate with the inside of the sealing device, then the penetrant in the glue tank flows into the sealing device under the action of the pressure difference and gradually flows in the fiber cloth. penetration; S70: Observe the penetration of the penetrant to the fiber cloth to be tested under the specified pressure through the top plate, read the position of the flow front of the penetrant from the scale on the top plate and record the corresponding value, and then calculate the penetrant by the formula. The permeability in the object to be tested under a certain temperature and a certain pressure value; S80: Reset the heating temperature of the penetrant or the negative pressure value in the sealing device, and repeat steps S10 to S70 to complete the acquisition of multiple sets of test data.

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