Quality detection device used after LED display screen patching

Abstract

The present application relates to LED circuit board detection technical field, specifically, it relates to quality detection device for LED display screen patching, including detection box, feeding device, discharging device and detection instrument arranged in the detection box, the feeding device and the discharging device are provided with the turnover mechanism for the circuit board is turned over, the turnover mechanism is provided with turnover horizontal plate, the first end and the end between the both sides the turnover horizontal plate forms the feeding area and the discharge area, and the limiting mechanism and the guide plate are arranged on the corresponding turnover horizontal plate of discharge area. With the help of both sides guide plate, the circuit board is corrected in the transmission stage, which prevents its deviation, and when the circuit board rotates to the preset release angle and releases, the circuit board is guided from the knocking end of the turnover horizontal plate to the sinking end by the guide plate under the action of gravity, the automatic displacement detection position is realized, the detection speed is improved, and unnecessary energy consumption is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED circuit board detection, in particular to a quality detection device for LED display screen patches. BACKGROUND

[0002] LED display screen circuit board patch solder joint strength detection is a commonly used test method for evaluating the connection strength between patch components (such as resistors, capacitors, integrated circuits, etc.) and circuit board solder joints. This test helps to ensure the quality of soldering and avoid potential soldering failures.

[0003] A circuit board patch solder joint strength detection device is disclosed in Chinese Patent Publication No. CN118483030A, which includes a clamping mechanism, the clamping mechanism is arranged symmetrically on both sides of the detection instrument body, and the clamping mechanism includes a telescopic rod arranged on the side of the detection instrument body. The telescopic member drives the shaft to move forward, so that the clamping mechanism drives the circuit board body into the detection instrument body for detection. The rotating gear compresses the torsional spring, and under the action of the torsional spring's resilience, the control rod slides in the second arc groove to minimize the occupation of space below the circuit board body when it is turned over, and the other side of the circuit board body is turned over to face upwards, thereby realizing the detection of the solder joint strength of both sides of the circuit board body.

[0004] When the front surface of the circuit board is detected, its back surface is detected by turning it over. Since the end of the circuit board is placed on the two side conveying devices, in order to make the two side conveying devices rotate synchronously, it is necessary to use a connecting member to fix the two side conveying devices as a whole, and in addition, the transmission components between the two side conveying devices can easily block the back surface of the circuit board after it is turned over, thereby affecting the detection of the solder joints.

[0005] Therefore, in order to avoid blocking and facilitate manual removal of the circuit board during solder joint detection, the circuit board is usually conveyed to the end of the turning device (this end is the detection area); however, when the back surface is turned over to the upper side, the position of the circuit board changes, and the circuit board is rotated to the far end and separated from the detection area, at this time, the conveying device needs to be conveyed to the detection area again for detection, thereby affecting the detection speed and increasing unnecessary energy consumption. SUMMARY

[0006] The present application provides a quality detection device for LED display screen patches, which corrects the circuit board during the conveying stage by means of two side guide plates to prevent it from deviating, and when the circuit board is turned to a preset release angle for release, it is guided from the knocking end of the turning horizontal plate to the sinking end by the guide plate under the action of gravity, realizing automatic displacement of the detection position, improving the detection speed, and reducing unnecessary energy consumption, thereby solving the problems raised in the above background technology, namely:

[0007] In order to achieve the above object, the quality detection device for LED display screen patching after includes a detection box, a feeding device, a discharging device and a detector arranged in the detection box, a turnover mechanism for turning over the circuit board is arranged between the feeding device and the discharging device, a turnover horizontal plate is arranged on the turnover mechanism, an inlet area and a discharge area are formed at the first end and the last end between the two sides of the turnover horizontal plate, a limiting mechanism and a guide plate are arranged on the turnover horizontal plate corresponding to the discharge area, the limiting mechanism is used for moving the guide plate to the circuit board, so as to limit the deviation of the circuit board through the guide plate, and the limiting mechanism is also used for tensioning the upper and lower conveying belts, the circuit board is locked by the upper and lower conveying belts, and when the circuit board is turned over to a preset release angle, the guide plate guides the circuit board from the discharge area to the inlet area, and the turnover detection is realized.

[0008] The limiting mechanism includes a power part, the power part includes a hydraulic cylinder fixed on the turnover vertical plate and a power plate fixed at the telescopic end of the hydraulic cylinder, a push rod penetrating through the turnover vertical plate is fixed on the guide plate corresponding to one end of the power plate, a push-pull spring is elastically fixed and connected between the push rod and the power plate, and the push-pull spring is used for realizing flexible force transmission. When an external force is applied to one end of the push rod, the power plate moves towards the turnover vertical plate, and the push-pull spring can absorb part of the energy through elastic deformation in the process, so as to avoid rigid contact and direct transmission to the circuit board, and reduce the risk of damage of the circuit board due to excessive force.

[0009] Secondly, the limiting mechanism also includes a limiting part, the limiting part includes a clamping plate arranged in the inner side of the turnover horizontal plate, the clamping plate is symmetrically arranged upward and downward, and the clamping plate is located in the conveying belt. The upper and lower clamping plates are relatively moved to press the conveying belt, and the two ends of the circuit board are locked by the conveying belt.

[0010] That is, the pressure applied by the inner eight-angled inclined surface to the epitaxial plate overcomes the elastic potential energy of the supporting spring, forces the upper and lower clamping plates to move relatively, the clamping plate presses the conveying belt, so that the conveying belt is in a taut state, the circuit board is clamped and fixed by the upper and lower conveying belts, and the circuit board is prevented from falling off during turnover.

[0011] When the circuit board is guided: the turnover horizontal plate has a through slot, an epitaxial plate fixed with the clamping plate is slidably arranged in the through slot, and the distal end of the epitaxial plate is bent and matched with the inner eight-angled inclined surface formed at the end of the power plate.

[0012] Sliding blocks are fixed on both sides of the epitaxial plate, the sliding blocks are slidably connected with the sliding grooves in the turnover horizontal plate, and supporting springs are elastically connected between the upper and lower epitaxial plates.

[0013] The two ends of the turnover horizontal plate are respectively turned to one end of the turnover horizontal plate, and the other end is in a sunken state, so that when the circuit board is released, the circuit board is guided from the discharge area to the inlet area by the guide plate under the action of gravity

[0014] Compared with the prior art, the present application has the following advantages:

[0015] The circuit board is corrected by the guide plates on both sides to prevent deviation, and when the circuit board is turned to the preset release angle for release, the circuit board is guided from the knocking end of the turnover horizontal plate to the sinking end by the guide plates under the action of gravity, so that the detection position is automatically displaced, the detection speed is improved, and unnecessary energy consumption is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0017] Figure 2 It is a front view of the overall structure of the present application;

[0018] Figure 3 It is a left view of the driving motor, turnover horizontal plate and conveyor belt structure of the present application;

[0019] Figure 4 It is a schematic diagram of the circuit board conveying principle of the present application;

[0020] Figure 5 It is a schematic diagram of the inward retraction structure of the present application;

[0021] Figure 6 It is a schematic diagram of the movement principle of the guide plate of the present application;

[0022] Figure 7 It is a schematic diagram of the circuit board correction principle of the present application;

[0023] Figure 8 It is a schematic diagram of the circuit board turnover of the present application.

[0024] The meanings of the various reference numerals in the drawings are as follows:

[0025] 100, detection box; 101, feeding device; 102, discharging device;

[0026] 110, turnover mechanism; 111, driving motor; 112, turnover vertical plate; 113, turnover horizontal plate; 114, conveyor belt; 115, support; 116, synchronization plate; 117, angle sensor;

[0027] 120, feeding area; 121, discharging area;

[0028] 130, limiting mechanism; 131, hydraulic cylinder; 132, power plate; 133, clamping plate; 134, extension plate; 135, supporting spring;

[0029] 140, guide plate; 141, stop plate; 142, push rod; 143, push-pull spring. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work are within the protection scope of the present application.

[0031] In the welding point detection, in order to avoid shielding and facilitate manual taking out of the circuit board, the circuit board is usually conveyed to the end of the turnover device (the end is the detection area); however, when the back surface is turned to the upper side, the position of the circuit board changes, the circuit board is turned to the far end and separated from the detection area, at this time, the circuit board needs to be conveyed to the detection area again by the conveying device to be detected, thereby affecting the detection speed;

[0032] Therefore, in view of the above problems, the present application provides a quality detection device for LED display screen patching, as shown in Figure 1 、 Figure 2 The quality detection device for LED display screen patching comprises a detection box 100, a feeding device 101, a discharging device 102 and a detector arranged in the detection box 100 (refer to the dotted line part in the detection box 100), the feeding device 101 and the discharging device 102 are respectively arranged on the two sides of the detection box 100, and a turnover mechanism 110 for turning over the circuit board is arranged between the feeding device 101 and the discharging device 102, in the feeding process, the circuit board to be detected is placed on the feeding device 101 by manual operation, the feeding device 101 conveys the circuit board to the turnover mechanism 110, when the front surface detection of the circuit board is completed, the turnover mechanism 110 turns over the circuit board to the back surface upward for detection, finally, when the detection is completed, the circuit board on the turnover mechanism 110 is discharged by the discharging device 102, so as to complete the whole detection process;

[0033] As shown in Figure 3 、 Figure 4As shown, the turnover mechanism 110 is provided with turnover horizontal plates 113, and the first end and the last end between the two turnover horizontal plates 113 form the feeding area 120 and the discharging area 121. During the feeding stage, the turnover mechanism 110 includes the turnover vertical plates 112 fixed with the turnover horizontal plates 113 and used to drive the turnover horizontal plates 113 to rotate, the turnover vertical plates 112 have the rotating shafts in the middle part, the supports 115 are rotatably connected to the rotating shafts, the supports 115 bear the pressure from the rotating shafts, and the drive motor 111 is arranged on one side of the support 115 and used to drive the rotating shaft to rotate. Therefore, when the circuit board is conveyed to the feeding area 120 by the feeding device 101, two groups of conveyors 114 are arranged on the inner side of the turnover horizontal plates 113, and the space for the displacement of the circuit board is formed between the upper and lower conveyors 114. The circuit board is conveyed to the space between the upper and lower conveyors 114, the upper conveyor 114 is close to the circuit board, and the lower conveyor 114 is in contact with the circuit board and bears the circuit board. The two ends of the circuit board are on the lower conveyor 114 and are not in contact with the upper conveyor 114 (see FIG. 8). Figure 5 Secondly, the conveyor 114 is driven to rotate by the motor, and the circuit board is transferred from the feeding area 120 to the discharging area 121, that is, Figure 4 、 5 the state of the circuit board.

[0034] It should be noted that the device is controlled by the electric control system. When the conveyor 114 conveys the circuit board from the feeding area 120 to the discharging area 121, the sensor (not shown in the figure) arranged on the turnover horizontal plate 113 corresponding to the discharging area 121 feeds the signal to the electric control system, and the electric control system stops the continuous conveying of the circuit board.

[0035] Then, when the circuit board is conveyed to the discharging area 121 for detection, the back surface needs to be turned up after the front surface detection is completed. At this time, in order to ensure that the two turnover horizontal plates 113 rotate synchronously, the synchronous plate 116 is fixedly connected between the two turnover vertical plates 112. In this way, when the drive motor 111 drives the rotating shaft to rotate through the belt, the two turnover horizontal plates 113 can synchronously rotate counterclockwise, so as to realize the turnover work of the circuit board.

[0036] Before the turning, in order to avoid the increase of the turning angle of the circuit board, when the friction between the circuit board and the lower conveying belt 114 can no longer maintain the stability, the circuit board slides downward along the lower conveying belt 114 under the action of gravity, and finally separates from the lower conveying belt 114; therefore, the limiting mechanism 130 and the guide plate 140 are arranged on the corresponding turnover horizontal plate 113 of the discharge area 121, the limiting mechanism 130 is used to push the guide plate 140 to the circuit board, so as to limit the deviation of the circuit board through the guide plate 140, and the limiting mechanism 130 is also used to tension the upper and lower conveying belts 114, so as to lock the circuit board by means of the upper and lower conveying belts 114, and when the circuit board is turned to the preset release angle, the guide plate 140 guides the circuit board from the discharge area 121 to the feeding area 120, so as to realize the turning operation of the circuit board; the specific principle is as follows:

[0037] Firstly, the structure of the limiting mechanism 130 is disclosed in combination with the Figure 4 、 Figure 6 、 Figure 7 , the limiting mechanism 130 includes a power part, the power part includes a hydraulic cylinder 131 fixed on the turnover vertical plate 112 and a power plate 132 fixed at the extension end of the hydraulic cylinder 131, one end of the power plate 132 corresponds to the guide plate 140 and is fixed with a push rod 142 penetrating through the turnover vertical plate 112, a push-pull spring 143 is elastically fixed and connected between the push rod 142 and the power plate 132, the push-pull spring 143 is used to realize flexible force transmission, so that when an external force is applied to one end of the push rod 142 by the power plate 132, the push-pull spring 143 can absorb part of the energy through elastic deformation during the process of the power plate 132 approaching the turnover vertical plate 112, avoiding the direct transmission of rigid contact to the circuit board, and reducing the risk of damage to the circuit board due to excessive force;

[0038] In addition, during the conveying of the circuit board to the discharge area 121, the two ends of the circuit board close to the turnover vertical plate 112 have a spacing, which is to reduce the friction between the circuit board and the turnover vertical plate 112 when the conveying belt 114 conveys the circuit board, and to improve the service life of the circuit board, and at the same time, the spacing between the circuit board and the turnover vertical plate 112 can also avoid uneven friction between the two sides, and reduce the phenomenon of deviation and skew of the circuit board.

[0039] In view of the above problems that the circuit board may deviate and skew, as shown in the Figure 7 , before the front surface detection of the circuit board, the hydraulic cylinder 131 pushes the power plate 132 to move, forcing the two side guide plates 140 to retract to resist and limit the deviation of the circuit board, so as to correct the circuit board and prevent the deviation of the circuit board from affecting the detection accuracy.

[0040] In addition, the limiting mechanism 130 also includes a limiting part, which includes a clamping plate 133 disposed inside the flipping cross plate 113. The clamping plates 133 are arranged symmetrically at the top and bottom and are located inside the conveyor belt 114. The upper and lower clamping plates 133 are in the following states: Figure 5 As shown, during the circuit board straightening process, the upper and lower clamps 133 apply pressure to the conveyor belt 114 through relative movement, thereby locking both ends of the circuit board with the help of the conveyor belt 114.

[0041] The reason why clamping plate 133 can move relative to clamping plate 133 is that, on the other hand, the flipping horizontal plate 113 has a through groove, and an extension plate 134 fixed to clamping plate 133 is slidably disposed in the through groove (sliders are fixed on both sides of extension plate 134, the sliders are slidably connected to the sliding groove in flipping horizontal plate 113, and a support spring 135 is elastically connected between the upper and lower extension plates 134). The distal end of extension plate 134 is bent and fits against the inward V-shaped inclined surface formed at the end of power plate 132. Under normal conditions, support spring 135 supports the upper and lower extension plates 134 to prevent the clamping plate 133 from moving. Friction occurs between 33 and the conveyor belt 114, affecting the service life of the conveyor belt 114. Secondly, when the hydraulic cylinder 131 pushes the power plate 132 to move, the inward V-shaped inclined surface of the power plate 132 applies pressure to the end of the outer extension plate 134. At the same time, under the restriction of the slider, the pressure applied by the inward V-shaped inclined surface to the outer extension plate 134 overcomes the elastic potential energy of the support spring 135, forcing the upper and lower clamping plates 133 to move relative to each other. The clamping plates 133 apply pressure to the conveyor belt 114, so that the conveyor belt 114 is in a taut state. The circuit board is clamped and fixed by the upper and lower conveyor belts 114 to prevent it from falling off when flipping.

[0042] After the front side of the circuit board is inspected, the flip plate 113 is flipped, and at this point, it returns to its original position. Figure 2 As shown, an angle sensor 117 is installed on one side of the bracket 115. The angle sensor 117 is used to detect the rotation angle of the shaft. When the shaft rotates to the preset release angle, that is... Figure 8 The flipping plate 113 rotates from point a to point b, that is, both ends of the flipping plate 113 rotate so that one end is raised and the other end is lowered, so that when the circuit board is released, it can be guided from the discharge area 121 to the feed area 120 by gravity and in conjunction with the guide plate 140, thereby realizing the flipping; the specific principle is as follows:

[0043] First, it should be understood that the angle between points a and b is an obtuse angle, and should ideally be as perpendicular as possible. This way, when the circuit board is released from the clamping plate 133, more gravitational potential energy is converted into kinetic energy, and the friction between the circuit board and the conveyor belt 114 is reduced. When releasing the circuit board, it returns to... Figure 6 , 7As shown, the hydraulic cylinder 131 reversely drives the power plate 132 to move, the pressure of the inner eight-angled inclined surface on the outer extension plate 134 is weakened, and the clamping plate 133 is gradually moved upward to reset under the elastic potential of the supporting spring 135; in the process, the circuit board is released by the knocking end and slides to the sinking end under the action of gravity; when the circuit board slides to the sinking end, the guide plate 140 at the sinking end is fixed with a stop plate 141 for intercepting the released circuit board, so as to avoid that the circuit board is separated from the conveying belt 114;

[0044] Moreover, since the push-pull spring 143 is in a compressed state, the inner side of the guide plate 140 abuts against the circuit board; when the friction force received by the circuit board cannot overcome the gravity of the circuit board, the circuit board is released; at this time, the upper and lower conveying belts 114 are in a reset state, the tension of the upper and lower conveying belts 114 is reduced, and the guide plate 140 is also in a reset state; since the extension end of the hydraulic cylinder 131 returns slowly, the guide plate 140 is still in a reset stage for limiting the circuit board after the circuit board is released, so as to prevent that the circuit board deviates due to uneven friction force received on both sides;

[0045] Moreover, the stop plate 141 is not completely reset, so that the circuit board is guided to the sinking end by the guide plates 140 on both sides, the circuit board is turned over, the detection time is saved, then the turnover horizontal plate 113 is turned to a horizontal state to detect the back surface, the circuit board that has been turned over does not need to be conveyed again, and the energy consumption is reduced.

[0046] After the detection is completed, the stop plate 141 is reset, the circuit board is taken out from the feeding area 120 by manual operation, then the turnover horizontal plate 113 is reversely turned to reset, and a new circuit board to be detected is conveyed again.

[0047] That is, the circuit board in the conveying stage is corrected by the guide plates 140 on both sides to prevent deviation, and when the circuit board is turned to a preset release angle to be released, the circuit board is guided from the knocking end of the turnover horizontal plate 113 to the sinking end by the guide plate 140 under the action of gravity, so that the detection position is automatically displaced, the detection speed is improved, and unnecessary energy consumption is reduced.

[0048] The above shows and describes the basic principles, main features and advantages of the present application. It should be understood by those skilled in the art that the present application is not limited to the above-mentioned embodiments, the above-mentioned embodiments and descriptions in the specification are only preferred examples of the present application, and are not intended to limit the present application; various changes and improvements can be made to the present application without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A quality detection device for LED display screen patching, comprising a detection box (100), a feeding device (101), a discharging device (102) and a detector arranged in the detection box (100), characterized in that: A flipping mechanism (110) for flipping the circuit board is provided between the feeding device (101) and the discharging device (102). A flipping plate (113) is provided on the flipping mechanism (110). A feeding area (120) and a discharging area (121) are formed at the beginning and end of the flipping plate (113) on both sides, respectively. A limit mechanism (130) and a guide are provided on the flipping plate (113) corresponding to the discharging area (121). The limiting mechanism (130) is used to push the guide plate (140) against the circuit board to limit the offset of the circuit board through the guide plate (140). The limiting mechanism (130) is also used to tension the upper and lower conveyor belts (114) to lock the circuit board by means of the upper and lower conveyor belts (114). When the circuit board is flipped to the preset release angle, the guide plate (140) guides the circuit board from the discharge area (121) to the feed area (120) to realize the flipping detection. Two sets of conveyor belts (114) are provided inside the flipping horizontal plate (113). A gap is formed between the upper and lower conveyor belts (114) to allow the circuit board to move. The upper conveyor belt (114) is close to the circuit board, and the lower conveyor belt (114) contacts the circuit board and supports it. The limiting mechanism (130) also includes a limiting part, which includes a clamping plate (133) disposed inside the flipping horizontal plate (113). The clamping plate (133) is arranged symmetrically up and down. The clamping plate (133) is located inside the conveyor belt (114). The relative movement of the upper and lower clamping plates (133) applies pressure to the conveyor belt (114), thereby locking the two ends of the circuit board with the help of the conveyor belt (114). The flip plate (113) is rotated so that one end is raised and the other end is lowered, so that when the circuit board is released, it can be guided from the discharge area (121) to the feed area (120) by gravity and in conjunction with the guide plate (140). The end of the guide plate (140) located at the sinking end is fixed with a stop plate (141) for intercepting the release circuit board to prevent the circuit board from detaching from the conveyor belt (114).

2. The device for quality detection of LED display screen after pasting according to claim 1, characterized in that: The flipping mechanism (110) includes a flipping upright plate (112) fixed to the flipping horizontal plate (113) and used to drive the flipping horizontal plate (113) to rotate. The flipping upright plate (112) has a rotating shaft in the middle that is rotatably connected to a bracket (115). The bracket (115) bears the pressure from the rotating shaft, and a drive motor (111) that drives the rotating shaft to rotate is provided on one side of the bracket (115).

3. The quality inspection device for LED display screens after chip mounting according to claim 2, characterized in that: The limiting mechanism (130) includes a power unit, which includes a hydraulic cylinder (131) fixed on the tilting plate (112) and a power plate (132) fixed to the telescopic end of the hydraulic cylinder (131). A push rod (142) that passes through the tilting plate (112) is fixed on a guide plate (140) corresponding to one end of the power plate (132). A push-pull spring (143) is elastically fixed between the push rod (142) and the power plate (132). The push-pull spring (143) is used to realize flexible force transmission.

4. The quality inspection device for LED display screen after chip mounting according to claim 3, characterized in that: The two side guide plates (140) are recessed to hold the circuit board in place and limit its offset.

5. The quality inspection device for LED display screen after chip mounting according to claim 3, characterized in that: The flip-over horizontal plate (113) has a through groove, and an extension plate (134) fixed to the clamping plate (133) is slidably disposed in the through groove. The far end of the extension plate (134) is bent and fits against the inward V-shaped inclined surface formed at the end of the power plate (132).

6. The quality inspection device for LED display screens after chip mounting according to claim 5, characterized in that: Slider blocks are fixed on both sides of the extension plate (134). The sliders are slidably connected to the grooves in the flip-up horizontal plate (113). A support spring (135) is elastically connected between the upper and lower extension plates (134).

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