CN113720746A - Device and method for testing permeability of penetrating agent in fiber cloth - Google Patents
Device and method for testing permeability of penetrating agent in fiber cloth Download PDFInfo
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- CN113720746A CN113720746A CN202110968935.9A CN202110968935A CN113720746A CN 113720746 A CN113720746 A CN 113720746A CN 202110968935 A CN202110968935 A CN 202110968935A CN 113720746 A CN113720746 A CN 113720746A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
The invention discloses a device for testing the permeability of a penetrant in fiber cloth, which comprises a workbench, wherein a fiber cloth unwinding mechanism is fixedly arranged on the top surface of the workbench in sequence and is used for unwinding the fiber cloth at a fixed length so as to realize the continuous supply of a test material; the punching and cutting mechanism is used for punching and cutting the top surface of the unreeled fiber cloth at a fixed length to realize the cutting of the unit length of the test material; the sealing device is used for sealing and clamping the punched and cut fiber cloth, and the interior of the sealing device is connected with a vacuumizing machine through a hose so as to realize the creation of a vacuum low-pressure environment in the sealing device; and the osmotic agent supply device is used for storing and heating the osmotic agent, the interior of the osmotic agent supply device is communicated with the interior of the sealing device through a hose, and the osmotic agent is automatically supplied into the sealing device under the action of pressure difference. The invention can realize the quick and repeated use of the sealing device, establishes a processing 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
Technical Field
The invention relates to the technical field of composite material performance testing, in particular to a device and a method for testing the permeability of a penetrant in fiber cloth.
Background
The advanced resin-based composite material has been widely applied in social life due to its unique advantages of high specific strength and specific stiffness, strong designability, fatigue resistance, good corrosion resistance, etc. With the increase of the use amount of the composite material structural member, the requirements of people on the performance of the composite material structural member are increasingly improved; as the key of the structural member material for exerting the performance of the structural member material, the forming process method and the process parameters are widely concerned, wherein the permeability of the resin in the fiber bundles is a crucial process parameter influencing the overall gel content of the composite structural member. Therefore, measuring the permeability of the resin in the fiber bundle is one of the essential process parameters in designing and processing the composite material.
However, at present, manual temporary test bed construction is mostly adopted for measuring the permeability of resin in carbon fiber bundles, the construction quality is uneven, the construction process is time-consuming and labor-consuming, and multiple persons are required to cooperate and complete; the components of the sealing device are typically sealed with mastic strips, so that the sealing device needs to be cleaned and arranged again each time it is used, which is cumbersome to operate and wastes resources. Most importantly, the existing manually-built test platform can only measure the permeability of the resin in the fiber bundle at a single room temperature, but the permeability of the resin in the fiber bundle at different temperatures is difficult to realize, and the permeability of the resin in the fiber bundle can not be comprehensively evaluated. Therefore, designing a testing device capable of measuring resin permeability at different temperatures becomes one of the key problems to be solved in improving the structural design and manufacturing level of composite materials.
Disclosure of Invention
According to the device for testing the permeability of the penetrating agent in the fiber cloth, the sealing device is sealed by the grooves and the rubber rings instead of the traditional putty strips, the sealing device is quickly and repeatedly used, the penetrating agent supply device with the electric heating function and the temperature monitoring function is arranged, the condition that the existing penetration rate test by manually laying the penetrating agent is low in efficiency is improved, meanwhile, a processing scheme for testing the penetration rate of the resin at different temperatures is established, and the penetration rate of the resin in the longitudinal direction and the transverse direction can be accurately measured.
In order to solve the technical problems, the invention adopts a technical scheme that: the permeability testing device of the penetrating agent in the fiber cloth comprises a workbench, wherein the top surface of the workbench is sequentially and fixedly provided with
The fiber cloth unwinding mechanism is used for unwinding the fiber cloth at a fixed length to realize continuous supply of the test material;
the punching and cutting mechanism is used for punching and cutting the top surface of the unreeled fiber cloth at a fixed length to realize the cutting of the unit length of the test material;
the sealing device is used for sealing and clamping the punched and cut fiber cloth, and the interior of the sealing device is connected with a vacuumizing machine through a hose so as to realize the creation of a vacuum low-pressure environment in the sealing device; and
the osmotic agent supply device is used for storing and heating the osmotic agent, the interior of the osmotic agent supply device is communicated with the interior of the sealing device through a hose, and the osmotic agent is automatically supplied into the sealing device under the action of pressure difference.
Furthermore, the fiber cloth unwinding mechanism comprises a winding roller rotatably arranged on the top surface of the workbench, a roller pair group positioned on the output side of the winding roller, and a driving motor in transmission connection with the end part of a rotating shaft of the roller pair group, and the end part of the fiber cloth wound on the winding roller is clamped in the roller pair group.
Further, sealing device is including being fixed in bottom plate on the workstation top surface, fixed connection in bracing piece, the sliding connection of bottom plate top surface four corners on the bracing piece and lie in sealing frame directly over the bottom plate, sliding connection on the bracing piece and lie in the roof directly over sealing frame, be detachably sealing connection between sealing frame and the bottom plate, between roof and the sealing frame.
Further, sealing rings are fixedly arranged on the top surface and the bottom surface of the frame edge of the sealing frame, and sealing caulking grooves corresponding to the sealing rings are formed in the top surface of the bottom plate and the bottom surface of the top plate.
Furthermore, a plurality of air suction holes are uniformly formed in the side face of the frame of the sealing frame, and each air suction hole is connected with the vacuumizing machine through a hose.
Furthermore, the top plate is made of transparent materials, and a through hole is formed in the center of the top surface of the top plate.
Furthermore, the top surface of roof is provided with the scale mark that is located the through-hole outside, and the bottom surface of top surface is provided with the annular putty strip that is located the through-hole outside.
Furthermore, the penetrating agent supply device comprises a glue groove, an electromagnetic heating coil arranged on the bottom surface of the inner wall of the glue groove, and a stirring device arranged in the glue groove, wherein a two-way valve is fixedly arranged at the bottom of the side surface of the glue groove, and the two-way valve is communicated with a through hole in the top plate through a hose.
Furthermore, a temperature monitoring device is also arranged in the glue groove.
Meanwhile, the permeability testing device based permeability testing method of the resin in the fiber cloth at different temperatures is also provided, and mainly comprises the following steps:
s10: continuously unwinding the fiber cloth to a preset length through a fiber cloth unwinding mechanism, and pausing the operation of the fiber cloth unwinding mechanism;
s20: in the process of continuously unreeling the fiber cloth, punching the top of the fiber cloth at the middle position of the fiber cloth through a punching and cutting mechanism, and cutting the fiber cloth after the vacuum unreeling mechanism is halted;
s30: adjusting a sealing frame of the sealing device to the lowest position, connecting the sealing frame with the bottom plate in a sealing manner, and fixing the sealing frame; placing the punched and cut fiber cloth on the top of the sealing frame, and adjusting the placement position of the fiber cloth; pasting a putty strip at the through hole on the bottom surface of the top plate, and adjusting the position of the top plate to be in sealing connection with the top surface of the sealing frame; at the moment, the putty strips are hermetically connected with the openings at the top of the fiber cloth, and the peripheral edges of the fiber cloth are clamped between the top plate and the sealing frame;
s40: starting the vacuumizing machine to enable the air pressure inside the sealing device to reach a preset test pressure value, then closing the vacuumizing machine, and testing whether the sealing device can maintain the pressure;
s50: heating and uniformly stirring the penetrant stored in the glue tank to a preset test temperature through a penetrant supply device;
s60: opening a two-way valve on the penetrant supply device to conduct the interior of the penetrant supply device with the interior of the sealing device, so that the penetrant in the glue groove flows into the sealing device under the action of pressure difference and gradually permeates into the fiber cloth;
s70: observing the permeation condition of the penetrant to the fiber cloth to be tested under the specified pressure through the top plate, reading the position of the flow front edge of the penetrant by using a graduated scale on the top plate, recording a corresponding numerical value, and further calculating the permeability of the penetrant in the object to be tested under a certain temperature and a certain pressure value through a formula;
s80: resetting the heating temperature of the penetrant or the negative pressure value in the sealing device, and repeating the steps S10-S70 to complete the acquisition of multiple sets of test data.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, a detachable sealing device structure is adopted, and the grooves and the rubber rings are adopted between the assembled parts to replace the traditional putty strips for sealing, so that the sealing device can be quickly and repeatedly used, the operation is more convenient, the using amount of the putty strips is effectively saved, and the test cost is reduced; the transparent top plate with scales is adopted, so that the flowing condition and the real-time permeation position of the resin in the object to be measured can be observed more conveniently and intuitively, and the permeation rate can be calculated more accurately;
(2) according to the invention, by arranging the penetrating agent supply device with the electric heating function and the temperature monitoring function, the condition of low efficiency existing in the prior penetration rate test by manually laying the penetrating agent is improved, and meanwhile, a processing scheme for testing the penetration rate of the resin at different temperatures is established, so that the accurate measurement of the penetration rate of the resin in the longitudinal direction and the transverse direction can be realized, and the penetration performance of the penetrating agent can be more accurately and comprehensively evaluated.
Drawings
FIG. 1 is a schematic perspective view of the present invention in an untested use state;
FIG. 2 is a schematic perspective view of the present invention in use during testing;
FIG. 3 is a schematic view of a three-dimensional structure of the glue tank of the present invention;
fig. 4 is a perspective view of a position adjusting member for the sealing device according to the present invention.
In the figure: the device comprises a working table 1, a fiber cloth unwinding mechanism 2, a punching and cutting mechanism 3, a sealing device 4, a bottom plate 41, a supporting rod 42, a sealing frame 43, a top plate 44, a penetrant feeding device 5, a glue tank 51, an electromagnetic heating coil 52, a two-way valve 53, a stirring device 54, a position adjusting piece 6, a pin 61, an elastic belt 62 and a supporting plate 63.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
The technical scheme of the invention is explained in detail below by taking resin as a penetrating agent and carbon fiber cloth with a vacuum bag structure as a test material.
Referring to fig. 1 and 2, a device for testing permeability of a penetrant in a fiber cloth includes 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 for unwinding fiber cloth at a fixed length, so that continuous supply of test materials is realized. The fiber cloth unwinding mechanism 2 adopts a general cloth unwinding mechanism, and comprises a winding roller rotatably arranged on the top surface of the workbench 1, a pair roller set (not shown in the figure) positioned on the output side of the winding roller, and a driving motor (not shown in the figure) in transmission connection with the end part of a rotating shaft of the pair roller set, wherein the end part of the fiber cloth wound on the winding roller is clamped in the pair roller set. Wherein, the fiber cloth to be tested is wound on a winding roller; the pair roller group is arranged on the right side of the winding roller and comprises an upper roller shaft and a lower roller shaft, the vertical distance between the two roller shafts is adjustable, the fiber cloth is clamped between the two roller shafts, and when the two roller shafts rotate in a pair mode, the fiber cloth is continuously unfolded from the winding roller and sent out; the driving motor adopts a stepping motor or a servo motor, the pair roller group is driven to rotate through the synchronous belt transmission mechanism, the number of rotating turns of the pair roller group is conveniently and accurately controlled, and therefore the length of the fiber cloth which is pulled and spread by the pair roller group can be accurately controlled.
The top surface fixed mounting of workstation 1 has the tailoring mechanism 3 that punches that is located the fibre cloth unwinding mechanism 2 right side for the top surface of the fibre cloth after unreeling punches and the fixed length cuts, realizes the unit length intercepting of test material. The punching and cutting mechanism 3 adopts the existing cutting mechanism, and comprises a gantry support, a punching mechanism (not shown in the figure) fixed in the middle of the top of the gantry support and a cutting knife (not shown in the figure) fixed on the side of the gantry support. In the process of continuously unreeling the fiber cloth, when the unreeling length is half of the preset unit length, the punching mechanism starts to work, and upper-layer fibers of the fiber cloth in the vacuum bag structure are punched to serve as a passage opening for realizing the input of a subsequent penetrating agent; when the unreeling length reaches the preset unit length, the fiber cloth unreeling mechanism 2 suspends the operation, and the cutting knife rapidly moves under the driving of the power unit to finish the cutting work of the fiber cloth, so that the fiber cloth unit to be tested with the consistent specification is manufactured.
The top surface of the workbench 1 is fixedly provided with a sealing device 4 on the right side of the punching and cutting mechanism 3 for sealing and clamping the punched and cut fiber cloth. The sealing device 4 includes a bottom plate 41 fixed on the top surface of the table 1, support rods 42 fixedly connected to four corners of the top surface of the bottom plate 41, a sealing frame 43 slidably connected to the support rods 42 and located directly above the bottom plate 41, and a top plate 44 slidably connected to the support rods 42 and located directly above the sealing frame 43. Wherein, a position adjusting piece 6 is respectively and fixedly arranged on the four corner side surfaces 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 supporting frame 42 can be adjusted. As shown in fig. 4, the position adjusting member 6 is of a spring pin structure, and includes a supporting plate 63 sleeved on the supporting frame 42, a pin 61 movably inserted into a side wall of the supporting plate 63, and an elastic band 62 connecting the supporting plate 63 and the pin 61. A plurality of slots (not shown) are uniformly distributed on the cylindrical surface of the supporting rod 42 along the vertical direction, when the pin 61 is pulled out, the elastic belt 62 is stretched to store energy, and the supporting plate 63 can slide up and down along the supporting rod 42, so that the position of the sealing frame 43/top plate 44 on the supporting rod 42 can be adjusted; when the pin 61 is released, it is reinserted into the slot of the support rod 42 by the restoring force of the elastic band 62 itself, sealing the fixed position of the frame 43/top plate 44. Obviously, other positioning mechanisms can be adopted to realize the position adjustment and positioning functions of the position adjusting part in the embodiment.
The sealing frame 43 and the bottom plate 41 and the top plate 44 and the sealing frame 43 are detachably connected in a sealing manner. In this embodiment, the top surface and the bottom surface of the frame of the sealing frame 43 are both fixedly provided with a sealing ring (not shown in the figure) made of rubber material, and the top surface of the bottom plate 41 and the bottom surface of the top plate 44 are both provided with sealing caulking grooves (not shown in the figure) corresponding to the sealing ring. When the sealing frame 43 moves downwards to the lowest position, the sealing ring on the bottom surface is embedded into the sealing embedding groove on the top surface of the bottom plate 41, so that the automatic sealing connection between the sealing frame 43 and the bottom plate 41 is realized; when the top plate 44 is lowered to the top surface position of the sealing frame 43, the sealing ring on the top surface of the sealing frame 43 is inserted into the sealing embedding groove on the bottom surface of the top plate 44, so as to realize the automatic sealing connection between the sealing frame 43 and the top plate 44, and the bottom plate 41, the sealing frame 43 and the top plate 44 form a sealed space. Meanwhile, in the process of embedding and sealing the top plate 44 and the sealing frame 43, the head end and the tail end of the fiber cloth are pressed into the sealing caulking grooves, so that the fiber cloth is fixed and sealed in the sealing device.
A plurality of air suction holes are uniformly formed in the side face of the frame of the sealing frame 43, and each air suction hole is connected with the vacuum extractor through a hose. The air in the sealing device 4 can be pumped out through the vacuum pumping machine, so that the internal closed space of the sealing device reaches a preset pressure value, and the establishment of a vacuum low-pressure environment in the sealing device 4 is realized. The top plate 44 is made of transparent materials, a through hole which is as large as a through hole opened at the top of the fiber cloth is formed in the center of the top surface of the top plate 44, the top surface of the top plate 44 is provided with a longitudinal scale mark and a transverse scale mark which are positioned outside the through hole, the real-time condition inside the sealing device 4 can be visually observed through the transparent top plate 44, the permeation process of the penetrant on the fiber cloth can be conveniently recorded, and the accuracy of a later-stage calculation structure is improved; the final penetration result of the penetrant on the fiber cloth can be visually read through the scale marks.
The bottom surface of the top plate 44 is provided with an annular putty strip (not shown in the figure) positioned outside the through hole, so that in the process of embedding the top plate 44 and the sealing frame 43, the annular putty strip can not only realize the fixation and sealing of the fiber cloth in the sealing device, but also complete the sealing and communication between the through hole on the top plate 44 and the through hole on the fiber cloth, thereby constructing a channel for the penetrating agent to enter the fiber cloth from the outside of the sealing device 4.
And the osmotic agent supply device 5 is used for storing and heating the osmotic agent, the interior of the osmotic agent supply device is communicated with the interior of the sealing device 4 through a hose, and the osmotic agent is automatically supplied into the sealing device 4 under the action of pressure difference. As shown in fig. 3, the penetrant supplying means 5 includes a glue tank 51, an electromagnetic heating coil 52 provided on the bottom surface of the inner wall of the glue tank 51, and a stirring device 54 provided inside the glue tank 51. The glue groove 51 is used for storing penetrant (such as resin), and the penetrant in the glue groove 51 can be heated through the electromagnetic heating coil 52 to meet the test requirements; the stirring device 54 is disposed at the center of the electromagnetic heating coil 52, mainly for ensuring uniform heating, and thus may adopt any form of suitable structure, preferably an electric stirring mechanism.
A two-way valve 53 is fixedly arranged at the bottom of the side surface of the glue groove 51, the two-way valve 53 is communicated with the through hole on the top plate 44 through a hose, and when the two-way valve 53 is closed, the sealing device 4 is in a closed state, so that a pressure maintaining test can be realized; when the sealing device 4 has good sealing performance, the two-way valve 53 is opened, and then the heated liquid resin in the glue tank 51 flows into the sealing device 4 and the fiber cloth under the action of the pressure difference, and then the infiltration process is started.
Further, a temperature monitoring device (not shown) is disposed in the glue tank 51, and 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 maintain the temperature of the penetrant. Meanwhile, different heating temperatures can be set through the temperature monitoring device so as to meet the requirements of different temperature tests.
The method for testing the permeability of the penetrant in the fiber cloth based on the permeability testing device mainly comprises the following steps:
s10: continuously unwinding the fiber cloth to a preset length through a fiber cloth unwinding mechanism, and pausing the operation of the fiber cloth unwinding mechanism; the preset length can be determined according to actual test requirements, and the length parameter of the preset length is converted into the corresponding driving pulse number of the driving motor through a control program, so that automatic adjustment and adaptation are realized;
s20: in the process of continuously unreeling the fiber cloth, punching the top of the fiber cloth at the middle position of the fiber cloth through a punching and cutting mechanism, and cutting the fiber cloth after the vacuum unreeling mechanism is halted;
s30: adjusting a sealing frame of the sealing device to the lowest position, connecting the sealing frame with the bottom plate in a sealing manner, and fixing the sealing frame; placing the punched and cut fiber cloth on the top of the sealing frame, and adjusting the placement position of the fiber cloth; pasting a putty strip at the through hole on the bottom surface of the top plate, and adjusting the position of the top plate to be in sealing connection with the top surface of the sealing frame; at the moment, the putty strips are hermetically connected with the openings at the top of the fiber cloth, and the peripheral edges of the fiber cloth are clamped between the top plate and the sealing frame;
s40: starting the vacuumizing machine to enable the air pressure inside the sealing device to reach a preset test pressure value, then closing the vacuumizing machine, and testing whether the sealing device can maintain the pressure;
s50: heating and uniformly stirring the penetrant stored in the glue tank to a preset test temperature through a penetrant supply device;
s60: opening a two-way valve on the penetrant supply device to conduct the interior of the penetrant supply device with the interior of the sealing device, so that the penetrant in the glue groove flows into the sealing device under the action of pressure difference and gradually permeates into the fiber cloth;
s70: observing the permeation condition of the penetrant to the fiber cloth to be detected under the specified pressure through the top plate, reading the position of the flowing front edge of the penetrant by using a graduated scale on the top plate, recording a corresponding numerical value, and calculating the permeability of the penetrant in the object to be detected under a certain temperature and a certain pressure value through a formula (such as a speed formula of Darcy's law);
s80: resetting the heating temperature of the penetrant or the negative pressure value in the sealing device, and repeating the steps S10-S70 to complete the acquisition of multiple sets of test data.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A penetration rate testing device of penetrating agent in fiber cloth comprises a workbench (1), and is characterized in that: the top surface of the workbench (1) is sequentially and fixedly provided with
The fiber cloth unwinding mechanism (2) is used for unwinding the fiber cloth at a fixed length to realize continuous supply of test materials;
the punching and cutting mechanism (3) is used for punching and cutting the top surface of the unreeled fiber cloth at a fixed length to realize the cutting of the unit length of the test material;
the sealing device (4) is used for sealing and clamping the punched and cut fiber cloth, and the interior of the sealing device is connected with a vacuumizing machine through a hose so as to realize the establishment of a vacuum low-pressure environment in the sealing device (4); and
and the osmotic agent supply device (5) is used for storing and heating the osmotic agent, the interior of the osmotic agent supply device is communicated with the interior of the sealing device (4) through a hose, and the osmotic agent is automatically supplied into the sealing device (4) under the action of pressure difference.
2. The device for testing the permeability of penetrant in a fiber cloth according to claim 1, wherein: the fiber cloth unwinding mechanism (2) comprises a winding roller, a roller pair group and a driving motor, wherein the winding roller is rotatably arranged on the top surface of the workbench (1), the roller pair group is positioned on the output side of the winding roller, the driving motor is in transmission connection with the end part of a rotating shaft of the roller pair group, and the end part of fiber cloth wound on the winding roller is clamped in the roller pair group.
3. The device for testing the permeability of penetrant in a fiber cloth according to claim 1, wherein: sealing device (4) including be fixed in bottom plate (41) on workstation (1) top surface, fixed connection in bracing piece (42) of bottom plate (41) top surface four corners, sliding connection in bracing piece (42) and lie in sealing frame (43) directly over bottom plate (41), sliding connection in bracing piece (42) and lie in roof (44) directly over sealing frame (43), be detachably sealing connection between sealing frame (43) and bottom plate (41), between roof (44) and sealing frame (43).
4. The device for testing the permeability of the penetrant in the fiber cloth according to claim 3, wherein: and sealing rings are fixedly arranged on the top surface and the bottom surface of the frame edge of the sealing frame (43), and sealing caulking grooves corresponding to the sealing rings are formed in the top surface of the bottom plate (41) and the bottom surface of the top plate (44).
5. The device for testing the permeability of the penetrant in the fiber cloth according to claim 3, wherein: a plurality of air suction holes are uniformly formed in the side face of the frame of the sealing frame (43), and each air suction hole is connected with a vacuumizing machine through a hose.
6. The device for testing the permeability of the penetrant in the fiber cloth according to claim 3, wherein: the top plate (44) is made of transparent materials, and a through hole is formed in the center of the top surface of the top plate.
7. The device for testing the permeability of the penetrant in the fiber cloth according to claim 6, wherein: the top surface of roof (44) is provided with the scale mark that is located the through-hole outside, and the bottom surface of roof (44) is provided with the annular putty strip that is located the through-hole outside.
8. The device for testing the permeability of the penetrant in the fiber cloth according to claim 6, wherein: the penetrant supply device (5) comprises a glue groove (51), an electromagnetic heating coil (52) arranged on the bottom surface of the inner wall of the glue groove (51) and a stirring device arranged in the glue groove (51), wherein a two-way valve (53) is fixedly arranged at the bottom of the side surface of the glue groove (51), and the two-way valve (53) is communicated with a through hole in the top plate (44) through a hose.
9. The apparatus for testing the permeability of penetrant in a fiber cloth according to claim 8, wherein: and a temperature monitoring device is also arranged in the glue groove (51).
10. A method for testing the permeability of resin in a fiber cloth at different temperatures based on the permeability testing device of claims 1-8, which is characterized in that: the method mainly comprises the following steps:
s10: continuously unwinding the fiber cloth to a preset length through a fiber cloth unwinding mechanism, and pausing the operation of the fiber cloth unwinding mechanism;
s20: in the process of continuously unreeling the fiber cloth, punching the top of the fiber cloth at the middle position of the fiber cloth through a punching and cutting mechanism, and cutting the fiber cloth after the vacuum unreeling mechanism is halted;
s30: adjusting a sealing frame of the sealing device to the lowest position, connecting the sealing frame with the bottom plate in a sealing manner, and fixing the sealing frame; placing the punched and cut fiber cloth on the top of the sealing frame, and adjusting the placement position of the fiber cloth; pasting a putty strip at the through hole on the bottom surface of the top plate, and adjusting the position of the top plate to be in sealing connection with the top surface of the sealing frame; at the moment, the putty strips are hermetically connected with the openings at the top of the fiber cloth, and the peripheral edges of the fiber cloth are clamped between the top plate and the sealing frame;
s40: starting the vacuumizing machine to enable the air pressure inside the sealing device to reach a preset test pressure value, then closing the vacuumizing machine, and testing whether the sealing device can maintain the pressure;
s50: heating and uniformly stirring the penetrant stored in the glue tank to a preset test temperature through a penetrant supply device;
s60: opening a two-way valve on the penetrant supply device to conduct the interior of the penetrant supply device with the interior of the sealing device, so that the penetrant in the glue groove flows into the sealing device under the action of pressure difference and gradually permeates into the fiber cloth;
s70: observing the permeation condition of the penetrant to the fiber cloth to be tested under the specified pressure through the top plate, reading the position of the flow front edge of the penetrant by using a graduated scale on the top plate, recording a corresponding numerical value, and further calculating the permeability of the penetrant in the object to be tested under a certain temperature and a certain pressure value through a formula;
s80: resetting the heating temperature of the penetrant or the negative pressure value in the sealing device, and repeating the steps S10-S70 to complete the acquisition of multiple sets of test data.
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| CN202110968935.9A CN113720746B (en) | 2021-08-23 | 2021-08-23 | Device and method for testing permeability of penetrating agent in fiber cloth |
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