A defect detector for polarizer

Abstract

The present invention relates to the field of polarizer detection technology, and in particular to a defect detector for polarizers, including a shell and a conveyor belt; the shell is connected to the conveyor belt, a suction chamber is arranged inside the shell, and a laser displacement sensor is arranged on the shell; it also includes an ion blower, a suction pipe, an electric guide rail, an electric slider, an electric push rod and a suction plate, etc.; a plurality of ion blowers are fixedly connected to the shell; a suction pipe is fixedly connected and connected to the shell, and the suction pipe is connected to the suction chamber; an electric guide rail is fixedly connected to the shell; a plurality of electric sliders are slidably connected to the electric guide rail; each electric slider is fixedly connected to an electric push rod; the telescopic parts of all electric push rods are fixedly connected to the suction plate. The present invention blows out ion wind through the ion blower to remove static electricity on the surface of the polarizer, and then controls the electric push rod to push the suction plate to adsorb the upper polarizer, and controls the electric push rod to drive the suction plate to move upward and reset, so that the upper polarizer is separated from the lower polarizer.

Description

Technical Field

[0001] The present invention relates to the technical field of polarizer detection, and in particular to a defect detector for a polarizer. Background Art

[0002] The full name of polarizer is polarizing film. The imaging of LCD must rely on polarized light. All liquid crystals have two polarizing films in the front and back attached to the liquid crystal glass, forming a liquid crystal film with a total thickness of about one millimeter.

[0003] When inspecting existing polarizers, due to the existence of static electricity, the polarizers will be adsorbed to each other, resulting in the external feeding device placing the polarizers on the conveyor belt, and it is easy to place the adsorbed polarizers on the conveyor belt at the same time, resulting in the detection mechanism being unable to detect the two polarizers bonded together at the same time, and then the detection mechanism detects that the polarizer is a defective product, resulting in misjudgment, and then the qualified polarizer is discarded as a defective product, resulting in the qualified polarizer being wasted. Summary of the invention

[0004] In order to overcome the defect that polarizers are attracted to each other due to static electricity, which makes it easy to mistake multiple polarizers for a single polarizer during detection, thereby causing qualified products to be misjudged as defective products, the present invention provides a defect detector for polarizers.

[0005] The technical solution of the present invention is: a defect detector for polarizer, comprising a shell and a conveyor belt; the bottom of the shell is connected to the conveyor belt, the shell is provided with a polarizer inlet and outlet located on both sides of the conveying direction of the conveyor belt, a suction chamber is provided above the shell, and a laser displacement sensor is provided at the entrance of the polarizer; it also includes an ion fan, a suction pipe, an electric guide rail, an electric slider, an electric push rod, a suction plate, an air pipe, a spring and a limit plate; a plurality of ion fans are fixedly connected to the shell, and the ion fans are used to transport ion wind to the polarizer on the conveyor belt; a suction pipe is fixedly connected to and communicated with the shell, and the suction pipe is communicated with the suction chamber; an electric guide rail is fixedly connected to the shell above the conveyor belt, and the The electric guide rail is parallel to the conveying direction of the conveyor belt; a number of electric sliders are slidably connected to the electric guide rail; each electric slider is fixedly connected to an electric push rod, and the direction of the electric push rod is toward the conveyor belt; the telescopic parts of all the electric push rods are commonly fixedly connected to a suction plate, and the suction plate is provided with a number of through holes for allowing the ion wind blown out by the ion blower to pass through, and the suction plate is provided with a number of suction holes; a number of air pipes are fixedly connected to the suction plate, and all the air pipes are connected to the suction holes of the suction plate; a number of springs are fixedly connected to both sides of the suction plate; all the springs on the same side of the suction plate are commonly fixedly connected to a limit plate, the distance between the two limit plates is greater than the width of the polarizer, and the length of the polarizer is greater than the length of the suction plate.

[0006] More preferably, a plurality of convex strips are fixedly connected to opposite sides of all the limiting plates, and the convex strips are deformable.

[0007] More preferably, it also includes a motor, a rotating plate and a guide plate; a plurality of motors are fixedly connected to the upper part of the suction plate; the rotating part of each motor is fixedly connected to a rotating plate; all the rotating plates are located at the left and right ends of the suction plate, and the opposite sides of all the rotating plates are fixedly connected to a guide plate.

[0008] More preferably, each guide plate is provided with a plurality of grooves.

[0009] More preferably, one end of each guide piece away from the fixing portion is a flat surface.

[0010] More preferably, it also includes an electric roller, a structured light sensor and a rotating roller; a square groove is opened inside the shell; a plurality of electric rollers are rotatably connected inside the shell, and all the electric rollers are divided into three layers: upper, middle and lower. The electric rollers on each layer are distributed in a U shape, and there is a gap between two adjacent layers of electric rollers; a plurality of rotating rollers are arranged between two adjacent electric rollers on each layer of electric rollers, and all the rotating rollers are rotatably connected to the inside of the shell, and the electric rollers and rotating rollers on each layer together form a U shape; a structured light sensor is fixed to the upper part of the right side outlet of the shell.

[0011] More preferably, it also includes a supporting net; a plurality of supporting nets are fixedly connected to the inner side of the shell, all of which are distributed in three layers: upper, middle and lower, and each layer of supporting nets is located between two adjacent electric rollers and rotating rollers on the same layer; all electric rollers, rotating rollers and supporting nets are located on the right side of the conveyor belt.

[0012] More preferably, it also includes a guide plate; the guide plate is fixedly connected to the inner side of the shell, the left side of the guide plate is opposite to the right end of the conveyor belt and is higher than the upper surface of the conveyor belt, and the right side of the guide plate is in contact with the surface of the electric roller located on the leftmost side of the middle layer.

[0013] More preferably, the guide plate is arranged to be inclined obliquely to the upper left.

[0014] More preferably, a guide plate is further included; a plurality of guide plates are fixedly connected to the bottom of the shell outlet, the guide plates are located below the structured light sensor, and the guide plates are located to the right of all the electric rollers.

[0015] Beneficial effect: The present invention uses an ion blower to blow out ion wind to remove static electricity on the surface of the polarizer, and then controls the electric push rod to push the suction plate to adsorb the upper polarizer, and controls the electric push rod to drive the suction plate to move upward and reset, so that the upper polarizer is separated from the lower polarizer.

[0016] After the present invention drives the suction plate to absorb the polarizer located on the uppermost layer by the electric push rod, the electric push rod is first controlled to drive the suction plate to move upward to separate the polarizer located on the uppermost layer from the polarizer on the middle layer, and stops when the right end of the polarizer on the uppermost layer is aligned with the gap between the upper electric roller and the middle electric roller, and then the electric slider is controlled to drive the electric push rod and the suction plate to continue to move rightward to make the polarizer enter the U-shaped gap formed by the upper and middle electric rollers and the rotating rollers, and then the polarizer is squeezed and bent by the electric roller and the rotating roller to perform bending detection on the polarizer. At this time, there are only two bonded polarizers on the conveyor belt, and then the above-mentioned polarizer separation operation can be performed.

[0017] The present invention supports and guides the end of the polarizer by arranging a supporting net, so that the end of the polarizer will not droop downward, and the polarizer is prevented from entering between the electric rollers of other layers, thereby squeezing and damaging the polarizer. At the same time, a guide plate is arranged to guide the right side of the polarizer, so that the right side of the polarizer can better enter the gap between the electric rollers. At the same time, the ion wind blown by the ion fan will blow downward through the supporting net to blow away dust and impurities on the surface of the polarizer, and then the dust and impurities will be sucked away through the suction pipe to avoid affecting the subsequent detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure disclosed by the defect detector for polarizer of the present invention;

[0019] Figure 2 A schematic diagram of the structure of a conveyor belt, an ion blower, a suction pipe, an electric guide rail, an electric slider, an electric push rod, a suction plate and an air pipe disclosed by the defect detector for polarizer of the present invention;

[0020] Figure 3 A schematic diagram of the structure of a spring, a limit plate, a motor, a rotating plate and a guide plate disclosed in the defect detector for a polarizer of the present invention;

[0021] Figure 4 A schematic diagram of the structure of the convex strips on the limit plate and the suction holes on the suction plate disclosed by the defect detector for polarizer of the present invention;

[0022] Figure 5 A schematic diagram of the structure of the motorized roller, the guide plate, the structured light sensor, the guide plate and the rotating roller disclosed by the defect detector for the polarizer of the present invention;

[0023] Figure 6 A schematic diagram of the structure of a support net disclosed by the defect detector for polarizer of the present invention;

[0024] Figure 7 This is a diagram showing the rotation state of the guide plate disclosed by the defect detector for the polarizer of the present invention.

[0025] Markings in the figure are: 1-shell, 2-conveyor belt, 3-ion fan, 4-suction pipe, 5-electric guide rail, 6-electric slider, 7-electric push rod, 8-suction plate, 9-trachea, 10-spring, 11-limiting plate, 12-motor, 13-rotating plate, 14-guide plate, 15-electric roller, 16-supporting net, 17-guide plate, 18-structured light sensor, 19-guide plate, 20-rotating roller, 1001-suction chamber, 1002-laser displacement sensor, 1003-square groove, 8001-through hole, 8002-suction hole, 1101-convex strip, 1401-groove. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the embodiments shown in the accompanying drawings.

[0027] Example 1

[0028] A defect detector for polarizers, such as Figure 1-Figure 4 and Figure 7 As shown, it includes a housing 1 and a conveyor belt 2; the bottom of the housing 1 is connected to the conveyor belt 2, the housing 1 is provided with a polarizer inlet and an outlet located on both sides of the conveying direction of the conveyor belt 2, a suction chamber 1001 is provided on the upper part of the housing 1, and the housing 1 is provided with a laser displacement sensor 1002 at the entrance of the polarizer;

[0029] It also includes an ion fan 3, a suction pipe 4, an electric guide rail 5, an electric slider 6, an electric push rod 7, a suction plate 8, an air pipe 9, a spring 10 and a limit plate 11; a plurality of ion fans 3 are fixedly connected to the shell 1, and the ion fans 3 are used to transport ion wind to the polarizer on the conveyor belt 2; a suction pipe 4 is fixedly connected and connected to the shell 1, and the suction pipe 4 is connected to the suction chamber 1001; an electric guide rail 5 is fixedly connected above the conveyor belt 2 in the shell 1, and the electric guide rail 5 is parallel to the conveying direction of the conveyor belt 2; a plurality of electric sliders 6 are slidably connected to the electric guide rail 5; each electric slider 6 is fixedly connected to an electric push rod 7, and the direction of the electric push rod 7 is toward the conveyor belt 2; all electric push rods 7 are retractable. The suction plate 8 is fixedly connected to the plurality of parts, and a plurality of through holes 8001 are provided on the suction plate 8 for allowing the ion wind blown out by the ion blower 3 to pass through, and a plurality of suction holes 8002 are provided on the suction plate 8; a plurality of air pipes 9 are fixedly connected to the suction plate 8, and all the air pipes 9 are connected to the suction holes 8002 of the suction plate 8; a plurality of springs 10 are fixedly connected to both sides of the suction plate 8; all the springs 10 located on the same side of the suction plate 8 are fixedly connected to a limiting plate 11, and the distance between the two limiting plates 11 is 0.2 mm larger than the width of the polarizer, and the length of the polarizer is larger than the length of the suction plate 8, and the suction plates 8 and limiting plates 11 of different sizes can be replaced for use according to polarizers of different specifications.

[0030] Two convex strips 1101 are fixedly connected to the opposite sides of all the limiting plates 11, and the convex strips 1101 are deformable. When the suction plate 8 sucks the polarizer and moves upward, the convex strips 1101 are used to move the polarizer below, thereby assisting the separation of the polarizer below from the polarizer above.

[0031] It also includes a motor 12, a rotating plate 13 and a guide piece 14; two motors 12 symmetrically distributed on the left and right are bolted to the upper part of the suction plate 8; the rotating part of each motor 12 is fixedly connected to a rotating plate 13; all the rotating plates 13 are located at the left and right ends of the suction plate 8, and the opposite back sides of all the rotating plates 13 are fixedly connected to a guide piece 14.

[0032] Each guide plate 14 is provided with a plurality of grooves 1401 , through which the ion wind is introduced into the bottom of the polarizer, so that more ion wind contacts and neutralizes the static electricity at the joint of the two polarizers, thereby eliminating the static electricity between the two polarizers.

[0033] One end of each guide plate 14 away from the fixing portion is a flat surface, which facilitates the guide plate 14 to be inserted into the bottom of the polarizer to guide the ion wind into the joint between the two polarizers.

[0034] It also includes an electric roller 15, a structured light sensor 18 and a rotating roller 20; a square groove 1003 is opened inside the shell 1; a plurality of electric rollers 15 are rotatably connected inside the shell 1, and all the electric rollers 15 are divided into three layers: upper, middle and lower. The electric rollers 15 on each layer are distributed in a U shape, and there is a gap between two adjacent layers of electric rollers 15, and the electric rollers 15 are driven to rotate by a motor; a plurality of rotating rollers 20 are arranged between two adjacent electric rollers 15 on each layer of electric rollers 15, and all the rotating rollers 20 are rotatably connected to the inside of the shell 1, and the electric rollers 15 and the rotating rollers 20 on each layer together form a U shape; a structured light sensor 18 is fixed to the upper part of the right side outlet of the shell 1.

[0035] Here is how the above example works:

[0036] During operation, the operator will stack the produced polarizers together, and then use the suction cup of the external transfer device to absorb the polarizer at the top, and then place the absorbed polarizer on the external feeding device, and connect the external feeding device to the left side of the shell 1, so that the external feeding device can transport the polarizer to the conveyor belt 2 in the center, and move the polarizer to the detection area for detection through the conveyor belt 2. Considering that due to the existence of static electricity, two adjacent polarizers will be absorbed together, causing the two polarizers to be absorbed by the suction cup of the external transfer device at the same time, so that the two polarizers stuck together are transported to the detection area for detection at the same time, resulting in abnormal detection data and affecting the detection accuracy. Therefore, the ion fan 3 and the suction pipe 4 are controlled to start. , ion wind is blown out through the ion fan 3, and the ion wind is blown to the surface of the polarizer through the through hole 8001 to remove the static electricity on the surface of the polarizer, and at the same time blow up the dust and impurities on the surface of the polarizer, and control the external pump to suck away the dust and impurities through the suction pipe 4. When the polarizer is transported from the external feeding device to the conveyor belt 2, the polarizer will pass through the laser displacement sensor 1002, and the thickness of the polarizer will be detected by the laser displacement sensor 1002. A normal polarizer will be directly moved to the detection area through the conveyor belt 2 for detection. If it is detected that two polarizers are attached together, the two polarizers attached together will be moved to the middle of the shell 1 through the conveyor belt 2 and stop, and the external feeding device is controlled to stop. At the same time, the electric slide is controlled Block 6 drives the electric push rod 7 and the suction plate 8 to move along the electric guide rail 5 to the top of the polarizer, and then controls the electric push rod 7 to push the suction plate 8 to move downward. When the suction plate 8 is in contact with the polarizer located above, the external pump connected to the air pipe 9 is controlled to start, so that the suction hole 8002 adsorbs the polarizer, and then controls the electric push rod 7 to drive the suction plate 8 to move upward and reset, so that the upper polarizer is separated from the lower polarizer. For the convenience of distinguishing the description below, the polarizer located below is called the first polarizer, and the polarizer located above is called the second polarizer. At this time, if the laser displacement sensor 1002 detects that the two polarizers are attached together, the conveyor belt 2 is controlled to transfer the first polarizer to the right, so that the first polarizer is driven to the middle The first polarizer passes through a U-shaped gap formed by a plurality of electric rollers 15 and a plurality of rotating rollers 20 in the middle and lower layers, so that the electric rollers 15 and the rotating rollers 20 squeeze and bend the first polarizer, and perform bending simulation on the first polarizer. When the first polarizer completely enters the U-shaped gap, the electric slider 6 is controlled to drive the electric push rod 7 and the suction plate 8 to move right, so that the suction plate 8 drives the second polarizer to move right, and the electric push rod 7 is controlled to push the suction plate 8 and the second polarizer to move downward, so that the right end of the second polarizer stops when it is aligned with the gap between the upper electric roller 15 and the middle electric roller 15, and then the electric slider 6 is continued to be controlled to drive the electric push rod 7 and the suction plate 8 to continue to move right.The right end of the second polarizer is made to enter between the upper and middle electric rollers 15, and then the suction plate 8 is controlled to loosen the second polarizer. Under the cooperation and transmission of the upper and middle electric rollers 15, the second polarizer is made to enter the U-shaped gap formed by the upper and middle electric rollers 15 and the rotating roller 20. Then, the second polarizer is squeezed and bent by the electric rollers 15 and the rotating rollers 20, and the bending of the second polarizer is simulated. When the polarizer comes out from the right end of the U-shaped gap, the simulation operation is completed and it enters the bending detection area. Then, the bent polarizer is detected by the structured light sensor 18, and the natural rebound condition of the polarizer is detected. The structured light sensor 18 is used to feed back to the background, so that the operator can understand the quality of the polarizer. Then, the polarizer that has completed the bending detection is driven to continue to move to the right through the external transportation device and enter the next detection area. Then, the electric slider 6 is controlled to drive the electric push rod 7 and the suction plate 8 to reset.

[0037] When there are more than two polarizers attached together, take three polarizers attached together as an example, since the suction plate 8 can only absorb the polarizer located on the top layer, the polarizers in the middle layer and the polarizers in the bottom layer are still attached together. Therefore, after the electric push rod 7 drives the suction plate 8 to absorb the polarizer located on the top layer, at this time, the electric push rod 7 is first controlled to drive the suction plate 8 to move upward to separate the polarizer located on the top layer from the polarizer in the middle layer, until the right end of the polarizer on the top layer is aligned with the upper electric roller 15 and the middle electric roller 15. The conveyor belt 2 stops when there is a gap between the upper and middle layers of the polarizer, and then controls the electric slider 6 to drive the electric push rod 7 and the suction plate 8 to continue to move to the right, so that the polarizer enters the U-shaped gap formed by the upper and middle electric rollers 15 and the rotating roller 20, and then the polarizer is squeezed and bent by the electric roller 15 and the rotating roller 20 to perform a bending test on the polarizer. At this time, there are only two bonded polarizers on the conveyor belt 2, and then the above-mentioned polarizer separation operation can be performed. In this way, the problem of multiple polarizers being bonded together, resulting in abnormal detection data and affecting detection accuracy is avoided.

[0038] Through the above work, the continuous separation and continuous detection of polarizers are achieved, which improves the detection efficiency while ensuring the detection accuracy.

[0039] It is also considered that although the ion fan 3 blows ion wind to the surface of the polarizer to remove static electricity, it takes time for the ion fan 3 to completely remove the static electricity on the surface of the polarizer. If the static electricity on the surface of the polarizer is not completely removed, when the electric push rod 7 drives the suction plate 8 to move the upper polarizer upward, there is a problem that the lower polarizer is still attached to the upper polarizer. Therefore, when the electric push rod 7 drives the suction plate 8 to move downward, the suction plate 8 drives the spring 10 and the limit plate 11 to move downward synchronously. Since the bottom of the limit plate 11 is initially located below the suction plate 8, Figure 3As shown, the bottom of the limit plate 11 will first contact the conveyor belt 2. At this time, the polarizer is located between the two limit plates 11. As the electric push rod 7 continues to drive the suction plate 8 to move downward, the limit plate 11 squeezes the spring 10 to contract, and finally the bottom surface of the suction plate 8 contacts the upper polarizer. At this time, when the electric push rod 7 drives the suction plate 8 to adsorb the polarizer located above and drives the polarizer to move upward, the polarizer located above will drive the polarizer located below to move synchronously, and the limit plate 11 will gradually separate from the conveyor belt 2. Under the action of the reset elastic force of the spring 10, the limit plate 11 is pushed downward, that is, the polarizer adsorbed by the suction plate 8 moves away from the limit plate 11, so that the limit plate 11 pushes the side of the polarizer downward. 8 is adsorbed, the upper polarizer is not affected by the pushing of the limiting plate 11, while the lower polarizer will be pushed downward by the limiting plate 11, that is, in this process, the limiting plate 11 continuously pushes the polarizer located below, and cooperates with the ion blower 3 at the same time, so that the polarizer located below is separated from the polarizer located above. It should be noted that since the polarizer has been partially freed of static electricity by the ion wind blown by the ion blower 3, the electrostatic adsorption between the two polarizers is not as tight as at the beginning. At the same time, by providing a convex strip 1101 on the limiting plate 11, when the polarizer located below rubs against the limiting plate 11, the convex strip 1101 pushes the polarizer located below, so that the polarizer is subjected to a greater pushing force, thereby ensuring that the two fitted polarizers are separated.

[0040] Taking into account that when the ion wind blows from top to bottom, it is not convenient to blow to the bonding point of two adjacent polarizers, so that the ion wind has a poor effect of removing static electricity on the bonding surface of two adjacent polarizers. Therefore, when it is detected that multiple polarizers are bonded together and the electric push rod 7 is controlled to drive the suction plate 8 to move downward, the suction plate 8 drives the motor 12, the rotating plate 13 and the guide plate 14 to move downward synchronously, and stops when the limit plate 11 is in contact with the conveyor belt 2. Then the motor 12 is controlled to drive the rotating plate 13 and the guide plate 14 to rotate in the direction away from the ion blower 3. During the rotation, the ends of the two guide plates 14 will be in contact with the surface of the conveyor belt 2, such as Figure 7As shown, as the guide piece 14 continues to rotate, the guide piece 14 is inserted into the bottom of the lowest polarizer, so that the ion wind blown by the ion blower 3 is guided by the guide piece 14, so that the ion wind is blown to the polarizer bonding position, thereby accelerating the removal of static electricity. At the same time, when the two guide pieces 14 are respectively inserted into the left bottom and right bottom of the lowest polarizer, the two guide pieces 14 are squeezed against each other, so that the left and right ends of multiple polarizers are squeezed and tilted by the two guide pieces 14, so that the polarizer forms a U shape. At this time, the deformation degrees of the two adjacent polarizers are inconsistent, so that the two adjacent polarizers will be offset, thereby achieving the pre-separation polarizer. At the same time, the ion wind is guided by the guide plate 14 and blows toward the inside from the gap at the left and right ends of the two adjacent polarizers, so as to better remove the static electricity between the two adjacent polarizers. At the same time, the end of the guide plate 14 away from the fixed part is set as a flat surface, so that the guide plate 14 can be more easily inserted into the bottom of the polarizer, and by opening a groove 1401 on the guide plate 14, the ion wind can enter under the polarizer through the groove 1401, so as to avoid the polarizer and the guide plate 14 being completely fitted, resulting in the problem that the ion wind cannot be guided to the bottom of the polarizer by the guide plate 14.

[0041] Example 2

[0042] On the basis of Example 1, Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, a supporting net 16 is also included; a plurality of supporting nets 16 are fixedly connected to the inner side of the shell 1, and all the supporting nets 16 are distributed in three layers: upper, middle and lower. The supporting nets 16 of each layer are located between two adjacent electric rollers 15 and rotating rollers 20 on the same layer; all the electric rollers 15, rotating rollers 20 and supporting nets 16 are located on the right side of the conveyor belt 2.

[0043] The guide plate 17 is fixedly connected to the inner side of the housing 1, the left side of the guide plate 17 is opposite to the right end of the conveyor belt 2 and is higher than the upper surface of the conveyor belt 2, and the right side of the guide plate 17 is in contact with the surface of the motorized roller 15 located on the leftmost side of the middle layer.

[0044] The guide plate 17 is tilted obliquely to the upper left, so as to support the polarizer that has lost the suction of the suction hole 8002 , so that the polarizer can smoothly enter the gap between the motorized rollers 15 .

[0045] A guide plate 19 is also included; two guide plates 19 are fixedly connected to the bottom of the inner portion of the shell 1 outlet, the guide plates 19 are located below the structured light sensor 18 , and the guide plates 19 are located to the right of all the motorized rollers 15 .

[0046] Here is how the above example works:

[0047] By setting a supporting net 16, the end of the polarizer is supported and guided so that the end of the polarizer will not droop downward, thereby preventing the polarizer from entering between the electric rollers 15 of other layers, thereby squeezing and damaging the polarizer. At the same time, by setting a guide plate 17, the right side of the polarizer is guided so that the right side of the polarizer can better enter the gap between the electric rollers 15. At the same time, the ion wind blown by the ion fan 3 will blow downward through the supporting net 16 to blow away the dust and impurities on the surface of the polarizer, and then the dust and impurities will be sucked away through the suction pipe 4 to avoid affecting the subsequent detection accuracy.

[0048] By providing the guide plate 19, the polarizer coming out from between the electric rollers 15 will be limited by the guide plate 19, thereby guiding the polarizer to the external transport device, which facilitates the normal operation of subsequent detection operations.

[0049] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A defect detector for a polarizer, comprising a housing (1) and a conveyor belt (2); the bottom of the housing (1) is connected to the conveyor belt (2); the housing (1) is provided with a polarizer inlet and an outlet located on both sides of the conveying direction of the conveyor belt (2); a suction chamber (1001) is provided at the top of the housing (1); and the housing (1) is provided with a laser displacement sensor (1002) at the entrance of the polarizer; the characteristics are as follows: It also comprises an ion fan (3), a suction pipe (4), an electric guide rail (5), an electric slider (6), an electric push rod (7), a suction plate (8), an air pipe (9), a spring (10) and a limit plate (11); a plurality of ion fans (3) are fixedly connected to the housing (1), and the ion fans (3) are used to convey ion wind to the polarizer on the conveyor belt (2); a suction pipe (4) is fixedly connected to and communicated with the housing (1), and the suction pipe (4) is communicated with the suction chamber (1001); an electric guide rail (5) is fixedly connected above the conveyor belt (2) in the housing (1), and the electric guide rail (5) is parallel to the conveying direction of the conveyor belt (2); a plurality of electric sliders (6) are slidably connected to the electric guide rail (5); each electric slider (6) is fixedly connected to an electric push rod (7), The electric push rods (7) are oriented toward the conveyor belt (2); the telescopic parts of all the electric push rods (7) are commonly fixedly connected to a suction plate (8); the suction plate (8) is provided with a plurality of through holes (8001) for allowing the ion wind blown out by the ion blower (3) to pass through; the suction plate (8) is provided with a plurality of suction holes (8002); the suction plate (8) is fixedly connected to a plurality of air pipes (9); all the air pipes (9) are in communication with the suction holes (8002) of the suction plate (8); a plurality of springs (10) are fixedly connected to both sides of the suction plate (8); all the springs (10) located on the same side of the suction plate (8) are commonly fixedly connected to a limit plate (11); the distance between the two limit plates (11) is greater than the width of the polarizer, and the length of the polarizer is greater than the length of the suction plate (8).

2. The polarizer defect detector according to claim 1, characterized in that: A plurality of convex strips (1101) are fixedly connected to opposite sides of all the limiting plates (11), and the convex strips (1101) are deformable.

3. The polarizer defect detector according to claim 1, characterized in that: It also includes a motor (12), a rotating plate (13) and a guide plate (14); a plurality of motors (12) are fixedly connected to the upper part of the suction plate (8); the rotating part of each motor (12) is fixedly connected to a rotating plate (13); all the rotating plates (13) are located at the left end and the right end of the suction plate (8), and the opposite sides of all the rotating plates (13) are fixedly connected to a guide plate (14).

4. The polarizer defect detector according to claim 3, characterized in that: Each guide plate (14) is provided with a plurality of grooves (1401).

5. A polarizer defect detector according to any one of claims 3 to 4, characterized in that: One end of each guide piece (14) away from the fixing portion is a flat surface.

6. The polarizer defect detector according to claim 1, characterized in that: It also comprises a motorized roller (15), a structured light sensor (18) and a rotating roller (20); a square groove (1003) is provided inside the shell (1); a plurality of motorized rollers (15) are rotatably connected inside the shell (1); all the motorized rollers (15) are divided into three layers: upper, middle and lower; the motorized rollers (15) of each layer are distributed in a U shape, and there is a gap between two adjacent layers of motorized rollers (15); a plurality of rotating rollers (20) are provided between two adjacent motorized rollers (15) on each layer of motorized rollers (15); all the rotating rollers (20) are rotatably connected to the inside of the shell (1); the motorized rollers (15) and the rotating rollers (20) of each layer together form a U shape; a structured light sensor (18) is fixedly connected to the upper portion of the right side outlet of the shell (1).

7. The polarizer defect detector according to claim 6, characterized in that: It also includes a supporting net (16); a plurality of supporting nets (16) are fixedly connected to the inner side of the shell (1); all the supporting nets (16) are distributed in three layers, namely, upper, middle and lower layers; the supporting nets (16) of each layer are located between two adjacent motorized rollers (15) and rotating rollers (20) of the same layer; and all the motorized rollers (15), rotating rollers (20) and supporting nets (16) are located on the right side of the conveyor belt (2).

8. The polarizer defect detector according to claim 7, characterized in that: It also includes a guide plate (17); the guide plate (17) is fixedly connected to the inner side of the shell (1); the left side of the guide plate (17) is directly opposite to the right end of the conveyor belt (2) and is higher than the upper surface of the conveyor belt (2); the right side of the guide plate (17) is in contact with the surface of the motorized roller (15) located on the leftmost side of the middle layer.

9. The polarizer defect detector according to claim 8, characterized in that: The guide plate (17) is arranged to be inclined obliquely to the upper left.

10. The polarizer defect detector according to claim 8, characterized in that: It also includes a guide plate (19); a plurality of guide plates (19) are fixedly connected to the bottom of the inner portion of the shell (1) of the outlet, the guide plates (19) are located below the structured light sensor (18), and the guide plates (19) are located to the right of all the electric rollers (15).

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