An online testing method for coating fastness

Abstract

The present invention discloses an online testing method for film fastness, which is to spray compressed gas with set spray pressure from the film side toward the film of the film-coated filter material along the thickness direction of the film-coated filter material to perform online testing. The present application can use compressed gas to spray the film-coated filter material from top to bottom, and no special sample is required. The film-coated filter material still on the production line can be tested online, which not only improves the testing efficiency, but also increases the testing frequency, and can adjust the production process in time according to the testing situation.

Description

Technical Field

[0001] The invention relates to an on-line testing method for coating fastness. Background Art

[0002] The coated filter material widely used in the filtration industry is a composite filter material formed by covering the surface of the fabric with a soft film made of polymer material. The quality of the coating mainly depends on the bonding strength between the soft film and the fabric, which is called the coating strength.

[0003] When testing the film fastness, the bubbling method is generally used. This method can only cut out areas from batch products and then conduct testing. This testing method can only be a post-test, and the process or raw materials cannot be adjusted in time for unqualified products. Therefore, when the test is unqualified, production has been going on for a period of time, which will result in a large number of unqualified products and cause waste. Summary of the invention

[0004] In order to solve the above problems, the present invention proposes an online testing method for film fastness, which is to spray compressed gas with a set injection pressure from the film side toward the film of the film-coated filter material along the thickness direction of the film-coated filter material for online detection. The film-coated filter material includes a fabric and a film bonded to the fabric, and the above-mentioned film side refers to the side of the film-coated filter material facing the film. When the present application is used for detection, the film-coated filter material that has just been produced and is located between the film-coating machine and the winding roller is tested online, and the film-coated filter material extends roughly in the horizontal direction, wherein the film is located on the upper side of the fabric.

[0005] The present application is used to detect the film fastness of hot-pressed film filter materials. At present, when testing the film fastness of adhesive film filter materials and hot-pressed film filter materials, it is carried out with reference to HBC 30-2004 "Film filter materials for bag dust collectors". During the test, the film side of the film filter sample is fixed upward on the mouth of a test cup with a cup diameter of 25mm, and compressed air is continuously sent into the cup until the long side dimension of the maximum film peeling bubble is greater than 2.5mm. The pressure at this time is the film fastness of the film filter material. Although this method can reflect the size of the film fastness, since the film fastness test depends on the judgment of the side length of the maximum film peeling bubble, the bubble side length test is difficult, and it is not easy to observe the measurement data. During the film fastness test, the test data fluctuates greatly, resulting in a large deviation value of the data, and it is impossible to truly reflect the film fastness.

[0006] In addition, the above test method requires cutting a piece of the entire coated filter material as a sample, which makes it impossible to perform online testing and the detection is relatively delayed.

[0007] When the present application is used to conduct online detection of the coating fastness of hot-pressed coated filter material, since the film is located on the upper side of the fabric during the production process of the coated filter material, during the detection, the compressed gas is blown directly toward the coated filter material in a vertical direction from top to bottom. Since the film is in a relaxed state on the fabric, when the adhesion between the film and the fabric in a certain area is poor, the film will separate from the fabric under the impact of the compressed gas, causing the film in the area to be in a free state. When the compressed gas is continuously sprayed toward the coated filter material, the film will produce wave patterns that spread outward from the injection point. The wave patterns are similar to the wave patterns produced by throwing stones into the water. The bonding fastness between the film and the fabric can be judged based on whether wave patterns are generated. Under appropriate spraying pressure and spraying time, it can be used as a judgment of the coating fastness.

[0008] During the actual use of the coated filter material, the flue gas will continuously flush the film of the coated filter material. The present application adopts a method of simulating actual production and uses compressed gas to impact the film to detect the bonding firmness of the film.

[0009] Since the present application can use compressed gas to spray the coated filter material from top to bottom, and no special samples are required, the coated filter material still on the production line can be tested online, which not only improves the detection efficiency, but also increases the detection frequency, and the production process can be adjusted in time according to the detection results.

[0010] With the existing detection method, since the coated filter material needs to be cut and sampled, no matter whether the test is qualified or not, the coated filter material will be damaged, affecting the yield of the coated filter material. In addition, in order to reduce the damage to the coated filter material, the lowest frequency of detection is used, which will also cause missed detection, and has the possibility of making some unqualified products become synthetic products, affecting the next process. The application can be used to perform non-destructive testing on the coated filter material, which will not cause any damage or destruction to the coated filter material, and can also increase the detection frequency of the coating fastness, thereby maximizing the qualified rate of the coated filter material.

[0011] Specifically, the set injection pressure of the compressed gas is 0.2-0.5MPa. Under the above pressure, the accuracy of the film fastness can be guaranteed. If the pressure is too high, it will cause unnecessary damage to the film filter material. If the pressure is too low, the required data cannot be obtained. In specific testing, different injection pressures can be selected as needed.

[0012] Specifically, in order to ensure the detection effect and detection efficiency, the injection time of compressed gas to the same detection point is 3-5s.

[0013] Further, for the convenience of testing, the online testing method is performed using an online testing device, which includes:

[0014] A support frame, a reciprocating mechanism and a detection mechanism, wherein the support frame extends along the width direction of the film-coated filter material, and the support frame is located between the film-coating machine and the winding roller and above the film-coated filter material; the reciprocating mechanism is installed on the support frame;

[0015] The detection mechanism includes a piston cylinder installed on the reciprocating mechanism, the piston rod of the piston cylinder extends downward, and a synchronization device is installed at the lower end of the piston rod. The synchronization device includes a hanger fixedly installed at the lower end of the piston rod, a reciprocating screw and a driving motor are installed on the hanger, the reciprocating screw is rotatably installed on the hanger and extends along the length direction of the coated filter material, the output shaft of the driving motor is connected to the reciprocating screw, a reciprocating nut is meshed on the reciprocating screw, a nozzle is installed on the lower side of the reciprocating nut, a compressed gas pipe is connected to the nozzle, and a regulating valve is installed on the compressed gas pipe; the piston cylinder can drive the nozzle to move downward to a set injection position, and when the nozzle reaches the set injection position, compressed gas can be sprayed toward the coated filter material through the nozzle.

[0016] When the online testing device is testing, the nozzle is used to blow compressed gas directly in the vertical direction toward the film filter material, impacting a certain area of ​​the film filter material, and testing the film fastness in the area. Since the support frame is located above the film filter material and extends along the width direction of the film filter material, the reciprocating mechanism can continuously test multiple areas in the width direction of the film filter material. As the film filter material moves, each test area forms a zigzag test route on the film filter material, which can test the film filter material in a certain area, effectively reducing the untested area and ensuring product quality.

[0017] The synchronization device is used to drive the nozzle and the coated filter material to move synchronously, so that during the compressed gas injection process, the nozzle can continuously spray toward the same position of the coated filter material. During the detection process, for the same detection point, the injection time needs to be maintained for 3-5s. Since the coated filter material is in a continuous production process, the nozzle and the coated filter material need to move synchronously. During the detection process, the synchronization device drives the nozzle to move toward the downstream side of the coated filter material to complete the detection of the same detection point.

[0018] Specifically, a distance control member is fixedly installed on the lower side of the reciprocating nut, and the nozzle is installed on the distance control member, and the nozzle passes through the distance control member downward; driven by the piston rod, the distance control member can press downward on the upper surface of the film filter material, and when the distance control member presses on the upper surface of the film filter material, the nozzle is located at the set injection position. The distance control member is used to avoid the nozzle directly pressing downward on the film filter material in case of misoperation, causing damage to the film filter material. After the distance control member is set, when misoperation occurs, the distance control member will first press on the film filter material. Since the film filter material has a certain elasticity, when the distance control member presses on the film filter material, it can push the film filter material downward to avoid the nozzle being too close to the film filter material or directly pressing on the film filter material, causing damage to the film filter material.

[0019] Furthermore, the distance control member includes a U-shaped plate with an opening facing downward, and exhaust parts are arranged at both ends of the U-shaped groove of the U-shaped plate. This design enables the compressed gas ejected from the nozzle to be discharged smoothly, avoiding a large amount of compressed gas from accumulating in the distance control member, causing a large pressure on the coated filter material, and causing damage to the coated filter material.

[0020] Specifically, the reciprocating mechanism includes a driving screw, a reciprocating trolley and a servo motor;

[0021] The driving screw is rotatably mounted on the support frame, the servo motor is fixedly mounted on the support frame, and the output shaft of the servo motor is connected to the driving screw. The reciprocating trolley is movably mounted on the support frame, and the reciprocating trolley has a set of driving nuts arranged on the driving screw, and the driving nut is engaged with the driving screw. The servo motor can drive the reciprocating trolley to reciprocate along the support frame through the driving screw; the cylinder barrel of the piston cylinder is fixedly connected to the driving nut. The design enables the detection mechanism to reciprocate along the width direction of the coated filter material, detect multiple positions in the width direction of the coated filter material, and reduce the number of nozzles to be set.

[0022] Furthermore, in order to reduce human operation errors, reduce operation intensity, and improve detection efficiency, the online testing device also includes a control center, which has a processor and a memory connected to each other, and the memory is used to store an executable instruction, which enables the processor to perform the following operations:

[0023] (1) Start the servo motor to make the reciprocating carriage reach the first set position;

[0024] (2) Start the piston cylinder so that the piston rod of the piston cylinder extends downward. When the nozzle reaches the set injection position, stop the movement of the piston rod;

[0025] (3) Open the regulating valve to allow the compressed gas to be ejected downward through the nozzle toward the membrane filter material, impacting the film on the membrane filter material. When the opening time of the regulating valve reaches the set injection time, close the regulating valve. While the compressed gas is being injected, start the driving motor synchronously to move the reciprocating nut from the first position to the second position. Along the moving direction of the membrane filter material, the first position is located on the upstream side, and the second position is located on the downstream side. The moving speed of the reciprocating nut is the same as the moving speed of the membrane filter material.

[0026] (4) Starting the piston cylinder again, causing the piston rod of the piston cylinder to retract upward, causing the nozzle to move upward to the set holding position, causing the reciprocating nut to return from the second position to the first position;

[0027] (5) Start the servo motor again to make the reciprocating carriage reach the next set position, and then repeat steps (2) to (4) until all tests are completed;

[0028] The reciprocating trolley is provided with at least three setting positions along the extension direction of the support frame.

[0029] Furthermore, in order to facilitate timely observation of the detection situation and retain the detection data, a camera is installed below the reciprocating nut, and the camera is used to observe the damage of the film on the coated filter material when the compressed gas is sprayed.

[0030] Specifically, the spray distance of the compressed gas is 2-10 cm. In the present application, the compressed gas is sprayed by a nozzle, and the spray distance refers to the distance between the spray port of the nozzle and the film when the nozzle sprays the compressed gas.

[0031] Within the above-mentioned spraying distance, it can not only ensure that the compressed gas can generate sufficient pressure on the membrane filter material, but also ensure that the compressed gas has a sufficient diffusion range to avoid excessive local pressure of the compressed gas on the membrane filter material, thereby damaging the membrane filter material. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 The figure is a schematic diagram of the position of an embodiment of the present invention on a membrane filter material production line.

[0033] Figure 2 It is a structural schematic diagram of an embodiment of the present invention.

[0034] Figure 3 yes Figure 2 Center AA view. DETAILED DESCRIPTION

[0035] The following is a brief description of the production of membrane filter materials. Figure 1When producing the film-coated filter material, the film 52 and the fabric 51 are overlapped and then passed through a film-coating machine 60 to form the film-coated filter material 50. The film-coating machine includes a pair of pressing rollers, wherein the pair of pressing rollers includes a heating roller 61 and a common roller 62. The finished film-coated filter material 50 is wound into a cylindrical product by a winding roller 63. The side of the film-coated filter material 50 facing the film-coating machine 60 is called the upstream side, and the side facing the winding roller 63 is called the downstream side. Figure 1 The direction of the arrow S in denoted as the direction from upstream to downstream. Between the laminating machine 60 and the winding roller 63, the film is located on the upper side of the fabric.

[0036] The following is a description of the online test device, please refer to Figure 2 and Figure 3 The online testing device comprises a support frame 21, a reciprocating mechanism and a detection mechanism. The support frame extends along the width direction of the film-coated filter material, and the support frame is located between the film-coating machine and the winding roller and above the film-coated filter material; the reciprocating mechanism is installed on the support frame. Figure 1 In the figure, the direction of arrow X indicates the width direction of the coated filter material.

[0037] A track 22 is installed on the lower side of the support frame 21. The reciprocating mechanism includes a driving screw 24, a reciprocating trolley 26 and a servo motor 29. A bearing seat 23 is installed at both ends of the support frame, and the driving screw 24 is rotatably installed on the bearing seat 23 through the bearing. The servo motor 29 is fixedly installed at one end of the support frame, and the output shaft of the servo motor is connected to the driving screw.

[0038] The reciprocating trolley 26 is movably supported on the track via rollers 261. The reciprocating trolley 26 has a set of driving nuts 25 arranged on the driving screw rod. The driving nut 25 is engaged with the driving screw rod 24. The servo motor can drive the reciprocating trolley to move back and forth along the support frame via the driving screw rod.

[0039] The detection mechanism includes a piston cylinder 27 fixedly mounted on the reciprocating mechanism, and a piston rod 28 of the piston cylinder 27 extends downward. In this embodiment, the piston cylinder 27 is specifically a hydraulic cylinder. It can be understood that in other embodiments, the piston cylinder can also be a pneumatic cylinder or an electric cylinder.

[0040] A synchronization device 80 is installed at the lower end of the piston rod 28, and the synchronization device 80 includes a hanger 81 fixedly installed at the lower end of the piston rod, on which a reciprocating screw 83 and a driving motor 82 are installed. Both ends of the reciprocating screw are rotatably installed on the hanger via bearings, and the output shaft of the driving motor is connected to the reciprocating screw, which extends along the length direction of the membrane filter material.

[0041] A reciprocating nut 85 is meshed on the reciprocating screw rod, and a distance control member 11 is mounted on the reciprocating nut and is located on the lower side of the reciprocating nut. The distance control member includes a U-shaped plate with an opening facing downward, and the U-shaped plate includes a top plate 111 extending in a horizontal direction and side plates 112 extending downward from both ends of the top plate. The two ends of the U-shaped groove of the U-shaped plate are open, so that the two ends of the U-shaped groove form exhaust parts. It can be understood that in another embodiment, baffles can also be welded at both ends of the U-shaped groove, and exhaust holes can be opened on the baffles, and the exhaust holes are formed as exhaust parts. The lower ends of the two side plates 112 of the U-shaped plate are bent outward in a horizontal direction to form a bending portion 113, so that when the distance control member abuts against the coated filter material through the bending portion 113, it has a larger contact area to avoid damage to the coated filter material.

[0042] The nozzle 13 is mounted on the top plate 111 of the U-shaped plate, and the nozzle passes through the top plate downward, that is, the nozzle passes through the distance control member downward. Driven by the piston rod, the distance control member can be pressed downward against the upper surface of the membrane filter material. When the distance control member is pressed against the upper surface of the membrane filter material, the nozzle is located at the set spraying position.

[0043] In this embodiment, a distance control member is provided, which is mainly used to prevent the nozzle from being too close to the membrane filter material or directly abutting against the membrane filter material due to misoperation, thereby damaging the membrane filter material.

[0044] The nozzle 13 is connected to a compressed gas pipe 14, and a regulating valve 15 is installed on the compressed gas pipe 14; the piston cylinder can drive the nozzle to move downward to a set injection position, and when the nozzle reaches the set injection position, the compressed gas can be sprayed toward the coated filter material through the nozzle. Specifically in this embodiment, the compressed gas is compressed air.

[0045] In order to observe the detection of the film filter material, a camera 70 is installed on the distance control member, and the camera is used to observe the damage of the film on the film filter material when the compressed gas is sprayed. Specifically in this embodiment, the camera 70 is installed on the top plate 111 of the U-shaped plate and penetrates the top plate downward to observe the film filter material.

[0046] To facilitate remote control, the present embodiment also includes a control center having a processor 40 and a memory 41 connected to each other. A display 45 is connected to the processor 40 for displaying corresponding data and images. The first motor controller 42, the second motor controller 46, the valve controller 43 and the solenoid valve 32 are all electrically connected to the processor 40.

[0047] The first motor controller 42 is used to control the servo motor 29, the second motor controller 46 is used to control the drive motor 82, and the valve controller 43 is used to control the regulating valve 15. The memory 41 is used to store an executable instruction, which enables the processor to perform the following operations, which are the online detection method:

[0048] (1) Start the servo motor to make the reciprocating carriage reach the first set position;

[0049] (2) Start the piston cylinder so that the piston rod of the piston cylinder extends downward. When the nozzle reaches the set injection position, stop the movement of the piston rod;

[0050] (3) Open the regulating valve to allow the compressed gas to be ejected downward through the nozzle toward the membrane filter material, impacting the film on the membrane filter material. When the opening time of the regulating valve reaches the set injection time, close the regulating valve. While the compressed gas is being injected, start the driving motor synchronously to move the reciprocating nut from the first position to the second position. Along the moving direction of the membrane filter material, the first position is located on the upstream side, and the second position is located on the downstream side. The moving speed of the reciprocating nut is the same as the moving speed of the membrane filter material.

[0051] (4) Starting the piston cylinder again, causing the piston rod of the piston cylinder to retract upward, causing the nozzle to move upward to the set holding position, causing the reciprocating nut to return from the second position to the first position;

[0052] (5) Start the servo motor again to make the reciprocating carriage reach the next set position, and then repeat steps (2) to (4) until all tests are completed;

[0053] The reciprocating trolley is provided with at least four setting positions along the extending direction of the support frame.

[0054] Specifically in this embodiment, the processor 40 adopts a 32-bit PLC programmable controller, and the servo motor itself carries a first motor controller 42, which can be directly connected to the processor 40. The drive motor 82 itself carries a second motor controller 46, which can be directly connected to the processor 40. The regulating valve 15 adopts an electric regulating valve, which itself carries a valve controller 43, which can be directly connected to the processor 40.

[0055] The electromagnetic valve 32 is specifically a three-position four-way valve, which is connected to the hydraulic system 31 to provide hydraulic oil for the piston cylinder. The two hydraulic interface pipes of the piston cylinder are respectively connected to the corresponding interfaces on the electromagnetic valve 32 through hydraulic pipes 33.

[0056] An induction magnetic ring is arranged on the piston of the hydraulic cylinder, and a first magnetic induction switch 271 and a second magnetic induction switch 272 are arranged on the outer side of the piston cylinder. The first magnetic induction switch 271 and the second magnetic induction switch 272 are used to sense the piston position of the hydraulic cylinder, wherein the first magnetic induction switch 271 is used to sense the upper limit position of the piston when it moves, and the second magnetic induction switch 272 is used to sense the lower limit position of the piston when it moves.

[0057] When the first magnetic induction switch 271 and the second magnetic induction switch 272 are electrically connected to the processor 40, when the first magnetic induction switch 271 and the second magnetic induction switch 272 obtain a signal when the piston moves to a set position, the signal is sent to the processor 40, and the processor 40 starts the solenoid valve 32 according to the pre-setting, so that the hydraulic oil enters the rodless chamber or the rod chamber of the piston cylinder, thereby extending or retracting the piston rod, driving the nozzle to move down or up.

[0058] The camera is electrically connected to the processor 40 and transmits the captured image to the display 45 .

[0059] In this embodiment, the set injection pressure of the compressed gas is 0.35 MPa, the injection time of the compressed gas to the same detection point is 4 s, and the injection distance H between the injection port of the nozzle and the film of the coated filter material is 4 cm, that is, the injection distance of the compressed gas is 4 cm.

[0060] It is understood that in other embodiments, the set injection pressure of the compressed gas can also be 0.2MPa, 0.3MPa, 0.4MPa or 0.5MPa, and of course can also be other pressure values ​​between 0.2-0.5MPa. The injection time can also be 3s, 3.5s, 4.5s or 5s, or other time values ​​between 3-5s. The injection distance H can also be 2cm, 6cm, 8cm or 10cm.

Claims

1. An online testing method for coating fastness, characterized in that: Along the thickness direction of the coated filter material, the compressed gas with a set injection pressure is sprayed from the film side toward the film of the coated filter material to perform online detection; The online detection is carried out by an online testing device, which includes: A support frame, a reciprocating mechanism and a detection mechanism, wherein the support frame extends along the width direction of the film-coated filter material, and the support frame is located between the film-coating machine and the winding roller and above the film-coated filter material; the reciprocating mechanism is installed on the support frame; The detection mechanism includes a piston cylinder installed on the reciprocating mechanism, the piston rod of the piston cylinder extends downward, and a synchronization device is installed at the lower end of the piston rod. The synchronization device includes a hanger fixedly installed at the lower end of the piston rod, and a reciprocating screw and a driving motor are installed on the hanger. The reciprocating screw is rotatably installed on the hanger and extends along the length direction of the coated filter material, and the output shaft of the driving motor is connected to the reciprocating screw; a reciprocating nut is meshed on the reciprocating screw, a nozzle is installed on the lower side of the reciprocating nut, a compressed gas pipe is connected to the nozzle, and a regulating valve is installed on the compressed gas pipe; the piston cylinder can drive the nozzle to move downward to a set injection position, and when the nozzle reaches the set injection position, compressed gas can be sprayed toward the coated filter material through the nozzle.

2. The online testing method according to claim 1, characterized in that: The set injection pressure of the compressed gas is 0.2-0.5MPa.

3. The online testing method according to claim 1, characterized in that: The injection time of compressed gas to the same detection point is 3-5s.

4. The online testing method according to claim 1, characterized in that: A distance controlling member is fixedly installed on the lower side of the reciprocating nut, and a nozzle is installed on the distance controlling member, and the nozzle passes through the distance controlling member downward; driven by the piston rod, the distance controlling member can be pressed downward against the upper surface of the coated filter material, and when the distance controlling member is pressed against the upper surface of the coated filter material, the nozzle is located at the set injection position.

5. The online testing method according to claim 4, characterized in that: The distance control member comprises a U-shaped plate with an opening facing downwards, and exhaust parts are arranged at both ends of the U-shaped groove of the U-shaped plate.

6. The online testing method according to claim 1, characterized in that: The reciprocating mechanism includes a driving screw, a reciprocating trolley and a servo motor; The driving screw is rotatably mounted on the support frame, the servo motor is fixedly mounted on the support frame, and the output shaft of the servo motor is connected to the driving screw. The reciprocating trolley is movably mounted on the support frame, and the reciprocating trolley has a set of driving nuts arranged on the driving screw, and the driving nut is engaged with the driving screw. The servo motor can drive the reciprocating trolley to move back and forth along the support frame via the driving screw; the cylinder barrel of the piston cylinder is fixedly connected to the driving nut.

7. The online testing method according to claim 6, characterized in that: The online testing device also includes a control center, which has a processor and a memory connected to each other, and the memory is used to store an executable instruction, and the executable instruction enables the processor to perform the following operations: (1) Start the servo motor to make the reciprocating carriage reach the first set position; (2) Start the piston cylinder so that the piston rod of the piston cylinder extends downward. When the nozzle reaches the set injection position, stop the movement of the piston rod; (3) Open the regulating valve to allow the compressed gas to be ejected downward through the nozzle toward the membrane filter material, impacting the film on the membrane filter material. When the opening time of the regulating valve reaches the set injection time, close the regulating valve. While the compressed gas is being injected, start the driving motor synchronously to move the reciprocating nut from the first position to the second position. Along the moving direction of the membrane filter material, the first position is located on the upstream side, and the second position is located on the downstream side. The moving speed of the reciprocating nut is the same as the moving speed of the membrane filter material. (4) Starting the piston cylinder again, causing the piston rod of the piston cylinder to retract upward, causing the nozzle to move upward to the set holding position, causing the reciprocating nut to return from the second position to the first position; (5) Start the servo motor again to make the reciprocating carriage reach the next set position, and then repeat steps (2) to (4) until all tests are completed; The reciprocating trolley is provided with at least three setting positions along the extension direction of the support frame.

8. The online testing method according to claim 1, characterized in that: A camera is also installed below the reciprocating nut, and the camera is used to observe the damage of the film on the coated filter material when the compressed gas is sprayed.

9. The online testing method according to claim 1, characterized in that: The spray distance of compressed gas is 2-10cm.

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