A fabric defect detection device and its detection method

Abstract

This invention belongs to the field of fabric inspection technology, and specifically relates to a fabric defect detection device and method. It includes a base and a frame fixed to the upper surface of the base. A controller is installed on the side wall of the frame. A set of infeed directional rollers and a set of outfeed directional rollers are rotatably arranged inside the frame. It also includes an outfeed side plate, fixed inside the frame near the outfeed directional rollers. The outfeed side plate is hollow, and a strip-shaped air outlet is fixedly inserted into the side wall of the outfeed side plate away from the infeed directional rollers. This invention can accurately identify visible and hidden defects in fabrics, unaffected by fabric color, texture, etc., ensuring detection accuracy and quality. Furthermore, it can use high-pressure pulsed airflow to expose hidden defects in advance and remove surface impurities. Simultaneously, it can automatically alert to potential problems in previous processes or storage stages, improving impurity issues before fabric inspection from the source.

Description

Technical Field

[0001] This invention belongs to the field of fabric inspection technology, and in particular relates to a fabric defect detection device and its detection method. Background Technology

[0002] Fabrics are widely used in the textile and apparel industries, and their quality directly affects the performance and value of finished products. Defects such as holes and uneven fibers can reduce the durability and aesthetics of fabrics, and even lead to the scrapping of finished products. Therefore, detecting fabric defects is the key to ensuring product quality, improving production efficiency and market competitiveness.

[0003] Currently, the mainstream method for fabric inspection is to photograph the fabric with a camera and then compare the captured images with standard images to determine whether the fabric has defects, such as the fabric defect detection device disclosed in patent publication number CN119936041A. However, this method is not good at identifying dark defects on dark fabrics, reflective interference from highly reflective fabrics, and tiny defects hidden under coarse-textured fabrics. It is also easily affected by ambient light, dust on the fabric surface, and static electricity, making it difficult to accurately detect those hidden defects that do not have obvious differences in appearance but actually exist. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing a fabric defect detection device and method.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a fabric defect detection device, comprising a base and a frame fixed to the upper surface of the base, a controller being installed on the side wall of the frame, and a set of feed directional rollers and a set of discharge directional rollers being rotatably arranged inside the frame, further comprising:

[0006] The discharge side plate is fixed inside the frame on the side near the discharge directional roller. The discharge side plate is hollow inside, and a strip-shaped air outlet is fixedly inserted into the side wall of the discharge side plate away from the feed directional roller.

[0007] A plunger air pump is located inside the lower side of the frame, and an airflow regulating component is installed inside the plunger air pump and the discharge side plate.

[0008] An exhaust detection unit is installed inside the frame, and the air inlet of the exhaust detection unit corresponds to the strip-shaped air outlet.

[0009] A pulse jet unit is installed inside the frame on the side near the feed directional roller;

[0010] The tensioning unit is installed on the upper side of the inside of the frame.

[0011] Preferably, the airflow distribution assembly includes a hollow connecting block fixedly disposed on the side wall of the discharge side plate, and a plunger pump is installed at the bottom of the hollow connecting block. The air supply end of the plunger pump is connected to the interior of the hollow connecting block. A first diversion hole is opened on the side wall of the hollow connecting block. Two partitions are fixedly installed inside the discharge side plate above the first diversion hole. A first gas flow sensor is fixedly installed on the side wall of the discharge side plate between the two partitions. The inlet and outlet ends of the first gas flow sensor are both fixedly connected to detection tubes, and both detection tubes penetrate the partitions on the same side. A diversion tube is fixedly inserted into the detection tube on the side of the outlet end of the first gas flow sensor, and a first diversion valve is installed inside the diversion tube. A second diversion valve is installed inside the detection tube on the side of the outlet end of the first gas flow sensor above the diversion tube. The controller controls the opening and closing degree of the valve plates of the first and second diversion valves according to the electrical signal fed back by the first gas flow sensor. The gas flow rate output by the plunger pump is greater than the gas flow rate discharged from the strip outlet.

[0012] Preferably, the exhaust detection unit includes a discharge baffle fixedly installed inside the frame, and the side wall of the discharge baffle has a plurality of detection air inlets corresponding to the positions of the strip-shaped air outlets. A detection cover is fixedly installed on the side wall of the discharge baffle away from the strip-shaped air outlets, and the side wall of the detection cover has a plurality of detection air outlets corresponding to the positions of the detection air inlets. A plurality of second gas flow sensors are installed inside the detection cover. The detection air inlets are connected to the corresponding detection air outlets through the second gas flow sensors on the same side. The second gas flow sensors are electrically connected to the controller.

[0013] Preferably, the pulse jet unit includes a feed side plate fixedly disposed inside the frame near the feed directional roller, and the feed side plate is hollow inside. Multiple strip-shaped jet nozzles are fixedly inserted into the side wall of the feed side plate away from the discharge side plate. A sealing plate is fixed inside the feed side plate below the strip-shaped jet nozzles, and a circular hole is formed on the end face of the sealing plate. A pulse-controlled valve is installed inside the circular hole. The hollow connecting block is fixedly connected to the side wall of the feed side plate, and the side wall of the hollow connecting block has a connection point with the feed side plate. The first and second diversion holes are connected. A first air outlet solenoid valve is installed inside the first diversion hole, and a second air outlet solenoid valve is installed inside the second diversion hole. A connecting pipe is fixedly inserted into the discharge side plate and the feed side plate. The connecting pipe is located below the partition plate and the sealing plate, and a one-way throttle valve is installed inside the connecting pipe. A pressure sensor is installed on the side wall of the feed side plate below the sealing plate. The controller controls the operation of the first and second air outlet solenoid valves according to the electrical signal fed back by the pressure sensor.

[0014] Preferably, the tensioning unit includes an electric hydraulic cylinder fixedly installed on the top of the frame, and a pressure detection component is installed on the movable end of the electric hydraulic cylinder. A U-shaped plate is installed on the pressure measuring end of the pressure detection component, and a movable roller is rotatably connected inside the U-shaped plate. The controller controls the operation of the electric hydraulic cylinder according to the electrical signal fed back by the pressure detection component.

[0015] Preferably, the inside of the frame is fixedly installed with a feed baffle corresponding to the position of the feed side plate, and the side wall of the feed baffle is provided with a plurality of strip-shaped ventilation holes corresponding to the position of the strip-shaped air jet.

[0016] Preferably, a sealing cover is fixedly installed on the side wall of the feed baffle, and a strip-shaped vent hole is located inside the sealing cover. A square tube is fixedly inserted into the side wall of the sealing cover, and a dust detection sensor electrically connected to the controller is installed on the square tube.

[0017] Preferably, a dust filter is provided above the base, and the air outlet of the dust filter is connected to the air intake of the plunger pump.

[0018] A method for detecting fabric defects, which employs the fabric defect detection device described above, includes the following steps:

[0019] Step 1: The produced fabric enters through the feed directional roller, passes between the feed side plate and the feed baffle, between the movable roller, the discharge side plate and the discharge baffle, and is finally led out through the discharge directional roller and wound up by the winding equipment.

[0020] Step 2: Start the controller. The controller controls the plunger pump to work according to the preset program, and at the same time controls the airflow distribution component and exhaust detection unit to detect defects in the fabric.

[0021] Step 3: The controller synchronously controls the pulse jet unit to work, outputting high-pressure pulse airflow to expose hidden defects in the fabric;

[0022] Step 4: When the staff receives the prompt message from the controller, they should immediately inspect the fabric defects and mark them.

[0023] Compared with existing technologies, the advantages of a fabric defect detection device and its detection method are as follows:

[0024] 1. Through the coordinated operation of the base, frame, controller, feed directional roller, discharge directional roller, discharge side plate, strip-shaped air outlet, plunger air pump, airflow distribution component and exhaust detection unit, airflow can be evenly output along the width of the fabric by gas blowing. Based on the difference in airflow through the fabric, it can accurately identify visible and hidden defects such as holes and loose fibers, without being affected by fabric color and texture, thus ensuring the accuracy and quality of fabric detection.

[0025] 2. By using the pulse jet unit, high-pressure pulse airflow can be generated simultaneously when using airflow to detect fabric defects. The high-pressure pulse airflow can force open the fiber gaps of hidden defects inside the fabric (such as loose fiber areas and adhesions) or cause fragile fibers to break, amplifying the difference in resistance to airflow penetration due to structural defects. This allows these hidden defects to be exposed in advance, making it easier for the exhaust detection unit to accurately capture pressure changes for identification. At the same time, the pulse airflow can remove dust and other impurities from the fabric surface in advance.

[0026] 3. By combining the feed baffle, strip ventilation hole, sealing cover, square tube and dust detection sensor, the system can automatically alert personnel to potential problems in the previous process or storage stage based on the dust and other impurities falling from the fabric surface. This can improve the problem of large amounts of dust and other impurities before fabric inspection to a certain extent. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a fabric defect detection device and detection method provided by the present invention;

[0028] Figure 2 This is a schematic diagram of the internal structure of the frame of the fabric defect detection device and detection method provided by the present invention;

[0029] Figure 3 This is a schematic diagram of the internal structure of the feed side plate and the discharge side plate of the fabric defect detection device and detection method provided by the present invention.

[0030] Figure 4 This is a three-dimensional structural schematic diagram of the detection cover of the fabric defect detection device and detection method provided by the present invention;

[0031] Figure 5 This invention provides a fabric defect detection device and method. Figure 2 Enlarged view of the structure of section A;

[0032] Figure 6 This is a three-dimensional structural diagram of the discharge side plate of a fabric defect detection device and detection method provided by the present invention.

[0033] Figure 7 This is a three-dimensional structural diagram of the feed side plate of a fabric defect detection device and detection method provided by the present invention.

[0034] Figure 8 This is a three-dimensional structural diagram of the feed baffle of the fabric defect detection device and detection method provided by the present invention.

[0035] Figure 9This is a cross-sectional view of the feed baffle of the fabric defect detection device and detection method provided by the present invention.

[0036] Figure 10 This is a three-dimensional structural diagram of the tensioning unit of a fabric defect detection device and detection method provided by the present invention.

[0037] In the diagram: 1. Base; 2. Frame; 3. Controller; 4. Feed directional roller; 5. Discharge directional roller; 6. Discharge side plate; 7. Strip-shaped air outlet; 8. Piston air pump; 9. Airflow distribution assembly; 91. Hollow connecting block; 92. First diversion hole; 93. Partition plate; 94. First gas flow sensor; 95. Detection tube; 96. Diversion tube; 97. First diversion valve; 98. Second diversion valve; 10. Exhaust detection unit; 101. Discharge baffle; 102. Detection air inlet; 103. Detection cover; 104. Detection air outlet; 105. Second gas flow sensor. 11 Pulse jet unit, 111 Feed side plate, 112 Strip jet nozzle, 113 Sealing plate, 114 Pulse solenoid valve, 115 Second diversion hole, 116 First outlet solenoid valve, 117 Second outlet solenoid valve, 118 Connecting pipe, 119 Air pressure sensor, 12 Tensioning unit, 121 Electro-hydraulic cylinder, 122 Pressure detection assembly, 123 U-shaped plate, 124 Movable roller, 13 Feed baffle, 14 Strip vent, 15 Sealing cover, 16 Square tube, 17 Dust detection sensor, 18 Dust filter. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0039] like Figures 1-10As shown, a fabric defect detection device includes a base 1 and a frame 2 fixed to the upper surface of the base 1. A controller 3 is installed on the side wall of the frame 2. A set of feeding directional rollers 4 and a set of discharging directional rollers 5 are rotatably arranged inside the frame 2. The device also includes a discharging side plate 6, which is fixed inside the frame 2 near the discharging directional rollers 5. The discharging side plate 6 is hollow, and a strip-shaped air outlet 7 is fixedly inserted into the side wall of the discharging side plate 6 away from the feeding directional rollers 4. A plunger air pump 8 is located on the lower side inside the frame 2. An airflow regulating assembly 9 is installed inside the plunger air pump 8 and the discharging side plate 6. The airflow regulating assembly 9 includes a hollow connecting block 91 fixedly arranged on the side wall of the discharging side plate 6, and the plunger air pump 8 is installed at the bottom of the hollow connecting block 91. The air supply end of the plunger air pump 8 is connected to the interior of the hollow connecting block 91. A first diversion hole 92 is opened on the side wall of the hollow connecting block 91. Inside the device, two baffles 93 are fixedly installed above the first diversion hole 92. A first gas flow sensor 94 is fixedly installed on the side wall of the discharge side plate 6 between the two baffles 93. The inlet and outlet ends of the first gas flow sensor 94 are both fixedly connected to detection tubes 95, and both detection tubes 95 pass through the baffles 93 on the same side. A diversion tube 96 is fixedly inserted into the detection tube 95 on the side of the outlet end of the first gas flow sensor 94, and a first diversion valve 97 is installed inside the diversion tube 96. A second diversion valve 98 is installed inside the detection tube 95 on the side of the outlet end of the first gas flow sensor 94, above the diversion tube 96. The controller 3 controls the opening and closing degree of the valve plates of the first diversion valve 97 and the second diversion valve 98 according to the electrical signal fed back by the first gas flow sensor 94. The gas flow rate output by the plunger pump 8 is greater than the gas flow rate discharged from the strip outlet 7.

[0040] The exhaust detection unit 10 is installed inside the frame 2, and the air inlet of the exhaust detection unit 10 corresponds to the strip-shaped air outlet 7. The exhaust detection unit 10 includes a discharge baffle 101 fixedly installed inside the frame 2. The side wall of the discharge baffle 101 is provided with a plurality of detection air inlets 102 corresponding to the positions of the strip-shaped air outlet 7. A detection cover 103 is fixedly installed on the side wall of the discharge baffle 101 away from the strip-shaped air outlet 7. The side wall of the detection cover 103 is provided with a plurality of detection air outlets 104 corresponding to the positions of the detection air inlets 102. A plurality of second gas flow sensors 105 are installed inside the detection cover 103. The detection air inlets 102 are connected to the corresponding detection air outlets 104 through the second gas flow sensors 105 on the same side. The second gas flow sensors 105 are electrically connected to the controller 3.

[0041] The pulse jet unit 11 is installed inside the frame 2 on the side near the feed directional roller 4. The pulse jet unit 11 includes a feed side plate 111 fixedly installed inside the frame 2 on the side near the feed directional roller 4. The feed side plate 111 is hollow inside. Multiple strip-shaped jet nozzles 112 are fixedly inserted into the side wall of the feed side plate 111 away from the discharge side plate 6. A sealing plate 113 is fixed inside the feed side plate 111 below the strip-shaped jet nozzles 112. A circular hole is opened on the end face of the sealing plate 113, and a pulse electric control valve 114 is installed inside the circular hole. A hollow connecting block 91 is fixedly connected to the side wall of the feed side plate 111. A second diversion hole 115 communicating with the feed side plate 111 is opened on the side wall of the hollow connecting block 91. A first exhaust electric control valve 116 is installed inside the first diversion hole 92, and a second exhaust electric control valve 117 is installed inside the second diversion hole 115. The discharge side plate 6 and The feed side plate 111 is fixedly connected to a connecting pipe 118. The connecting pipe 118 is located below the partition plate 93 and the sealing plate 113, and a one-way throttle valve is installed inside the connecting pipe 118 (under the action of the one-way throttle valve, the airflow can only flow from the feed side plate 111 to the discharge side plate 6). A pressure sensor 119 is installed on the side wall of the feed side plate 111 below the sealing plate 113. The controller 3 controls the first discharge solenoid valve 116 and the second discharge solenoid valve 117 to work according to the electrical signal fed back by the pressure sensor 119. When the pressure reaches the threshold, the pressure sensor 119 can convert the pressure into an electrical signal and feed it back to the controller 3. In order to prevent the high-pressure pulse airflow from blowing the fabric and causing the fabric to vibrate, which would affect the detection accuracy of the exhaust detection unit 10, a limiting roller can be installed on the side wall of the discharge baffle 101 to ensure the stability of the sliding contact between the fabric and the surface of the discharge baffle 101.

[0042] The tensioning unit 12 is installed on the upper side inside the frame 2. The tensioning unit 12 includes an electric hydraulic cylinder 121 fixedly inserted into the top of the frame 2. The movable end of the electric hydraulic cylinder 121 is equipped with a pressure detection component 122. The pressure measuring end of the pressure detection component 122 is equipped with a U-shaped plate 123. The movable roller 124 is rotatably connected inside the U-shaped plate 123. The controller 3 controls the electric hydraulic cylinder 121 to work according to the electrical signal fed back by the pressure detection component 122. The pressure detection component 122 includes at least a pressure sensor and multiple springs. The pressure sensor can detect the pressure of the fabric on the movable roller 124. When the pressure changes, the position of the movable roller 124 can be adjusted by the electric hydraulic cylinder 121 so that the fabric always maintains a constant tension.

[0043] The frame 2 is internally fixedly equipped with a feed baffle 13 corresponding to the position of the feed side plate 111, and the side wall of the feed baffle 13 is provided with multiple strip-shaped air holes 14 corresponding to the position of the strip-shaped air nozzle 112. This can support the fabric and prevent the fabric from bending and deforming to one side under the action of airflow, which would weaken the gas impact effect.

[0044] A sealing cover 15 is fixedly installed on the side wall of the feed baffle 13, and a strip-shaped vent 14 is set inside the sealing cover 15. A square tube 16 is fixedly inserted into the side wall of the sealing cover 15. A dust detection sensor 17 electrically connected to the controller 3 is installed on the square tube 16. The dust detection sensor 17 emits light and calculates the intensity of the light received by the receiving end. Based on the obstruction of light by dust, the dust concentration in the gas can be determined.

[0045] A dust filter 18 is installed on the top of the base 1, and the air outlet of the dust filter 18 is connected to the air intake of the plunger air pump 8. The dust filter 18 can intercept and filter dust and other impurities in the incoming air to ensure the cleanliness of the airflow. The dust filter 18 can be cleaned and replaced regularly.

[0046] The operating principle of this invention is explained as follows: The produced fabric is fed in from the feed directional roller 4, passes between the feed side plate 111 and the feed baffle 13, between the movable roller 124, the discharge side plate 6 and the discharge baffle 101, and finally exits through the discharge directional roller 5 (see reference). Figure 2 The fabric is wound up by a winding device, and the controller 3 is activated while the fabric is moving continuously.

[0047] The controller 3 controls the plunger pump 8 to work. The airflow output by the plunger pump 8 enters the feed side plate 111 through the hollow connecting block 91 and the first diversion hole 92. Then the airflow flows through the detection tube 95 and passes through the first gas flow sensor 94. The first gas flow sensor 94 detects the gas flow and converts the gas flow into an electrical signal to feed back to the controller 3 (taking a turbine flow meter as an example, when the airflow passes through, it drives the turbine blades to rotate. The first gas flow sensor 94 converts the rotation speed into an electrical signal and feeds it back to the controller 3). The greater the gas flow, the stronger the electrical signal fed back to the controller 3 by the first gas flow sensor 94. The controller 3 controls the opening and closing degree of the valve plates of the first diversion valve 97 and the second diversion valve 98 according to the electrical signal fed back by the first gas flow sensor 94. When the electrical signal strength is greater, the valve plate of the first diversion valve 97 is opened more and the valve plate of the second diversion valve 98 is opened less, ensuring that the gas flow through the second diversion valve 98 remains stable. The airflow through the second diversion valve 98 is discharged through the strip outlet 7.

[0048] Because the fabric passes between the discharge side plate 6 and the discharge baffle 101, the airflow discharged through the strip-shaped air outlet 7 will permeate the fabric and enter each detection air inlet 102. Then, the airflow passes through each second gas flow sensor 105 and finally exits through the detection air outlet 104. When the fabric has defects such as holes or loose fibers, because the fabric obstructs the airflow at this location less, more airflow passes through. Consequently, more airflow passes through the corresponding second gas flow sensor 105. The second gas flow sensor 105 converts the gas flow into an electrical signal and feeds it back to the controller 3 (second gas flow sensor). Device 105 uses a thermal gas flow meter. The airflow carries away the heat at the detection end of the thermal gas flow meter, creating a temperature difference between the detection end and the reference end, which in turn causes a change in resistance. When the electrical signal fed back by the second gas flow sensor 105 exceeds the threshold (this threshold is based on qualified fabric and measured under the same conditions), or when the difference between the maximum and minimum electrical signals fed back by each of the second gas flow sensors 105 exceeds the threshold (this threshold is based on qualified fabric and measured under the same conditions), the controller 3 will issue a voice alarm prompt. The staff should immediately check the defect at this location and take appropriate measures in a timely manner.

[0049] Secondly, when the plunger pump 8 is working, the controller 3 first controls the second outlet solenoid valve 117 in the second diversion hole 115 to open, and controls the first outlet solenoid valve 116 in the first diversion hole 92 to close. At this time, the airflow delivered by the plunger pump 8 enters the feed side plate 111 through the hollow connecting block 91 and the second diversion hole 115. Part of the airflow enters the discharge side plate 6 through the one-way throttle valve of the connecting pipe 118, and is finally discharged through the strip outlet 7. Since the gas flow rate output by the plunger pump is higher than the gas flow rate discharged by the strip outlet 7, it enters the feed side plate 111. 1. The gas inside cannot be discharged in time. Although some gas will be discharged through the connecting pipe 118, the air pressure inside the feed side plate 111 will still gradually increase. As the air pressure increases, the air pressure sensor 119 will detect that the air pressure has reached the threshold. At this time, the air pressure sensor 119 will send an electrical signal to the controller 3. The controller 3 will immediately control the first outlet solenoid valve 116 to open and the second outlet solenoid valve 117 to close. At this time, the gas discharged from the hollow connecting block 91 will directly enter the discharge side plate 6 through the first diversion hole 92. At the same time, the controller 3 will control the pulse solenoid valve 114. When the feed side plate 111 is opened, the high-pressure gas inside will be ejected through the pulse control valve 114 and various strip-shaped jet nozzles 112. The ejected high-pressure airflow will directly impact the fabric at the feed baffle 13. Under the action of the high-pressure airflow, dust and other impurities attached to the surface of the fabric will be blown away, and the loose areas of the fibers will expand under the impact of the airflow. Some aged or immature fibers will break directly, thus exposing these hidden defects in advance. This makes it convenient for the subsequent strip-shaped air outlet 7 and the second gas flow sensor 105 to detect these defects. As the gas is discharged, The air pressure inside the feed side plate 111 gradually decreases. After the air pressure drops to the threshold, the air pressure sensor 119 will send an electrical signal to the controller 3. At this time, the controller 3 controls the first outlet solenoid valve 116 to close again and the second outlet solenoid valve 117 to open again, until the air pressure sensor 119 sends a high-pressure gas signal to the controller 3 again. This cycle repeats, so that while outputting a stable airflow for fabric detection, pulsed high-pressure airflow can be continuously generated to expose hidden defects in the fabric in advance and remove dust and other impurities, thereby helping to improve the comprehensiveness and accuracy of defect detection.

[0050] Simultaneously, a pulsed airflow is blown onto the fabric surface, removing dust adhering to the fabric. Under the action of the airflow, the airflow carries dust and other contaminants into the sealed cover 15 through the strip-shaped vent 14, and finally discharges through the square tube 16. The dust detection sensor 17 detects the dust concentration in the passing airflow in real time (the dust detection sensor 17 emits light and calculates the intensity of the light received by the receiver; based on the obstruction of light by dust, it can determine the dust concentration in the gas). The dust detection sensor 17 converts the dust concentration into an electrical signal and feeds it back to the controller 3. The controller 3 calculates the average dust concentration carried in the gas every 10 minutes (this average dust concentration can be preset by the controller 3, for example, 1.0-2.0 mg / m³). 3 When the average dust concentration is too high, the controller 3 will issue a voice prompt to remind personnel to trace potential problems in the previous process or storage process. This can improve the phenomenon of large amounts of dust and other impurities before fabric inspection to a certain extent (dust collectors such as dust bags can be installed at the air outlet of the square tube 16 to prevent secondary pollution caused by dust and other impurities).

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A cloth defect detection device, comprising a base (1) and a frame (2) fixed on the upper surface of the base (1), a controller (3) is installed on the side wall of the frame (2), a group of feeding orientation rollers (4) and a group of discharging orientation rollers (5) are rotationally arranged in the frame (2), characterized in that, Also include: The discharge side plate (6) is fixed in the inside of the rack (2) near the discharge orientation roller (5) on one side, the inside of the discharge side plate (6) is hollow, and the side wall of the discharge side plate (6) is fixedly connected with a strip-shaped air outlet (7) away from the feeding orientation roller (4) on one side; The plunger air pump (8) is arranged in the inside of the rack (2) on the lower side, and the plunger air pump (8) is provided with an airflow allocation assembly (9) in the inside of the discharge side plate (6); The exhaust detection unit (10) is installed in the inside of the rack (2), and the air inlet end of the exhaust detection unit (10) corresponds to the strip-shaped air outlet (7); The pulse air jet unit (11) is installed in the inside of the rack (2) near the feeding orientation roller (4) on one side; The tensioning unit (12) is installed in the inside of the rack (2) on the upper side; The airflow allocation assembly (9) includes a hollow connecting block (91) fixedly arranged on the side wall of the discharge side plate (6), and the plunger air pump (8) is arranged at the bottom of the hollow connecting block (91), the air supply end of the plunger air pump (8) is communicated with the inside of the hollow connecting block (91), the side wall of the hollow connecting block (91) is provided with a first shunt hole (92), two baffles (93) are fixedly arranged in the inside of the discharge side plate (6) above the first shunt hole (92), a first gas flow sensor (94) is fixedly arranged on the side wall of the discharge side plate (6) between the two baffles (93), the air inlet end and the air outlet end of the first gas flow sensor (94) are fixedly communicated with a detection tube (95), the two detection tubes (95) penetrate the same side baffle (93), a shunt tube (96) is fixedly connected with the detection tube (95) on the air outlet end side of the first gas flow sensor (94), a first shunt valve (97) is arranged in the inside of the shunt tube (96), a second shunt valve (98) is arranged in the inside of the detection tube (95) on the air outlet end side of the first gas flow sensor (94) above the shunt tube (96), the controller (3) controls the opening and closing degree of the valve plate of the first shunt valve (97) and the second shunt valve (98) according to the electrical signal fed back by the first gas flow sensor (94), and the gas flow output by the plunger air pump (8) is greater than the gas flow discharged by the strip-shaped air outlet (7); The pulse air jet unit (11) comprises a feeding side plate (111) fixedly arranged inside the rack (2) near one side of the feeding direction roller (4), the inside of the feeding side plate (111) is hollow, a plurality of strip-shaped air jet ports (112) are fixedly inserted into the side wall of the feeding side plate (111) away from one side of the discharging side plate (6), a sealing plate (113) is fixedly arranged at a position below the strip-shaped air jet port (112) in the inside of the feeding side plate (111), a circular hole is formed in the end face of the sealing plate (113), and a pulse electric control valve (114) is arranged in the inside of the circular hole, the hollow connecting block (91) is fixedly connected with the side wall of the feeding side plate (111), a second shunt hole (115) is formed in the side wall of the hollow connecting block (91) and is in communication with the feeding side plate (111), a first air outlet electric control valve (116) is arranged in the inside of the first shunt hole (92), a second air outlet electric control valve (117) is arranged in the inside of the second shunt hole (115), the discharging side plate (6) and the feeding side plate (111) are fixedly inserted with a communication pipe (118) in common, the communication pipe (118) is arranged below the partition plate (93) and the sealing plate (113), a one-way throttling valve is arranged in the inside of the communication pipe (118), an air pressure sensor (119) is arranged at a position below the sealing plate (113) in the side wall of the feeding side plate (111), and the controller (3) controls the first air outlet electric control valve (116) and the second air outlet electric control valve (117) to work according to the electric signal fed back by the air pressure sensor (119).

2. A fabric defect detection device according to claim 1, wherein The exhaust gas detection unit (10) comprises a discharging baffle (101) fixedly arranged in the inside of the rack (2), a plurality of detection inlet holes (102) corresponding to the positions of the strip-shaped air outlet ports (7) are formed in the side wall of the discharging baffle (101), a detection cover (103) is fixedly arranged on the side wall of the discharging baffle (101) away from the strip-shaped air outlet ports (7), a plurality of detection outlet holes (104) corresponding to the positions of the detection inlet holes (102) are formed in the side wall of the detection cover (103), a plurality of second gas flow sensors (105) are arranged in the inside of the detection cover (103), the detection inlet holes (102) are in communication with the corresponding detection outlet holes (104) through the same side second gas flow sensors (105), and the second gas flow sensors (105) are electrically connected with the controller (3).

3. A fabric defect detection device according to claim 2, wherein The tensioning unit (12) comprises an electric hydraulic cylinder (121) fixedly arranged at the top of the rack (2), a pressure detection assembly (122) is arranged on the movable end of the electric hydraulic cylinder (121), a U-shaped plate (123) is arranged on the pressure detection end of the pressure detection assembly (122), a movable roller (124) is rotatably connected in the inside of the U-shaped plate (123), and the controller (3) controls the electric hydraulic cylinder (121) to work according to the electric signal fed back by the pressure detection assembly (122).

4. A fabric defect detection device according to claim 3, wherein The inside of the frame (2) is fixedly provided with a feeding baffle (13) corresponding to the position of the feeding side plate (111), and the sidewall of the feeding baffle (13) is provided with a plurality of strip-shaped air holes (14) corresponding to the position of the strip-shaped air jet (112).

5. A fabric defect detection apparatus according to claim 4, wherein The sidewall of the feeding baffle (13) is fixedly provided with a sealing cover (15), and the strip-shaped air holes (14) are arranged on the inner side of the sealing cover (15), the sidewall of the sealing cover (15) is fixedly provided with a square tube (16), and the square tube (16) is provided with a dust detection sensor (17) electrically connected with the controller (3).

6. The fabric defect detection apparatus according to claim 1, wherein The upper side of the base (1) is provided with a dust filter (18), and the air outlet end of the dust filter (18) is communicated with the air inlet end of the plunger air pump (8).

7. A fabric defect detection method using the fabric defect detection apparatus according to claim 4, characterized by, The detection method comprises the following steps: Step one, the output cloth enters from the feeding directional roller (4), passes between the feeding side plate (111) and the feeding baffle (13), the movable roller (124), the discharge side plate (6) and the discharge baffle (101), and finally is led out from the discharge directional roller (5), and the cloth is wound by the winding equipment; Step two, start the controller (3), the controller (3) controls the plunger air pump (8) to work according to the preset program, controls the air flow distribution assembly (9) and the exhaust detection unit (10) to work at the same time, and detects the defects of the cloth; Step three, the controller (3) synchronously controls the pulse air jet unit (11) to work, outputs high pressure pulse air flow to expose the hidden defects of the cloth; Step four, when the staff receives the prompt information sent by the controller (3), immediately checks the cloth defects, and marks the cloth defects.

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