CN206225768U - A cam pin module - Google Patents

Abstract

The utility model discloses a cam pin module, including contact pin mechanism, contact pin promotion cam, motor, main shaft, drive wheel and cutter mechanism, contact pin promotion cam and drive wheel are installed on the main shaft, and the drive wheel is connected with lever mechanism, and cutter mechanism also connects this lever mechanism, and contact pin promotion cam connects the drive plate through unloading the power mechanism, and contact pin mechanism also connects the drive plate, and cutter mechanism and contact pin mechanism dock; the driving plate is installed on a pair of slide rails, and the power of unloading mechanism includes a set of cam follower and a power of unloading base, and cam follower pushes away cam and catch bar butt joint with the contact pin respectively on one side, and the catch bar is fixed in on the driving plate. The utility model discloses a non-planar structure's ordinary circular wheel drive surely terminal with adopt the contact pin to promote cam drive contact pin, avoided the tradition to adopt a plurality of contact pins to promote the drawback that cam drive exists, with the about third of equipment cost reduction, contact pin speed improves more than 30%, contact pin precision, stability and life all obtain great promotion.

Description

A cam pin module

technical field

The utility model relates to the technical field of processing equipment in the electronic industry, in particular to a cam pin insertion device for connector pins.

Background technique

With the popularization and rapid development of electronic products, the demand for electronic connection components between electronic products is also increasing. The seat body of the electronic connection part is generally molded by plastic injection, that is, HOUSING (plastic shell), and a round hole for inserting a terminal is provided on the main body of the plastic shell. For terminal insertion, the most traditional way is to manually insert the terminals into the round holes one by one. Later, people used pin insertion machines to perform terminal insertion work. The processing speed of the traditional pin insertion machine usually can only reach 300~400 revolutions per minute, and the production efficiency is low.

With the rapid development of electronic products, and most electronic products are developing towards smaller and more precise directions, this makes people put forward higher requirements for the miniaturization and high density of connector terminals, and Obviously, the traditional pin insertion machine can no longer meet people's processing needs. Then came the high-speed automatic cam needle insertion machine. The basic principle is to use the motor to drive the cam as power to complete the needle insertion. For example, the invention patent No. ZL 201310310304.3 discloses a high-speed cam needle insertion machine, which uses three sets of cams. The structure, that is, both clamping, positioning and cutting are driven by cams. The disadvantages are that, first, the production of the cams is extremely precise, and the cost of three sets of cams is relatively high. The control structure is also relatively complicated and the precision is low; second, Due to the excessive number of cams, the speed is still not fast enough, which restricts the efficiency of the pin insertion; thirdly, the stability of the equipment during operation is poor, which will also affect the pin insertion effect.

Utility model content

The technical problem to be solved by the utility model is to provide a cam pin insertion module with more reasonable structure design, fast pin insertion speed, high matching precision and lower comprehensive cost.

In order to solve the above technical problems, the utility model adopts the following technical solution: a cam pin insertion module, including a pin insertion mechanism and a pin insertion driving cam, and is characterized in that it also includes a motor, a main shaft, a driving wheel and a cutter mechanism, The main shaft is connected to the motor through a coupling, and the pin pushes the cam and the driving wheel to form a coaxial fixation on the main shaft. The driving wheel is connected to a lever mechanism, and the cutter mechanism is also connected to the lever mechanism. A driving board is connected, and the pin insertion mechanism is also connected with the driving board, and the cutter mechanism is docked with the pin insertion mechanism; the driving board is installed on a pair of slide rails, and the force unloading mechanism includes a set of cam followers and a A swingable unloading base, the cam follower is fixed on the unloading base, one side of the cam follower is docked with the pin push cam, and the other side is docked with a push rod, the push rod is fixed on the drive plate, and the drive plate is connected with Reset device: push the cam through the pin to push the cam follower to swing together with the unloading base, and the cam follower drives the push rod to move accordingly, thereby driving the drive plate forward, thereby pushing the pin insertion mechanism forward to complete the terminal insertion operation, driving The plate is driven to reset by the reset device, thus reciprocating.

Further, the main shaft is fixed in the lower plate through the bearing seat, and the front plate, the rear plate, the side plate and the upper plate are installed on the lower plate, and the above-mentioned plates push the pins to the cam, the driving wheel, the lever mechanism and the unloading mechanism The cover is inside, and the needle insertion mechanism and the cutter mechanism are exposed outside the side panels; the slide rail is installed on the rear panel.

Further, the drive wheel includes an upper drive wheel and a lower drive wheel, the lever mechanism includes an upper lever and a lower lever, and the cutter mechanism includes an upper cutter and a lower cutter; the lower drive wheel is connected to the lower lever, and the front end of the lower lever Connect the cutter slide seat, the lower cutter slide seat is connected with the lower cutter fixing seat, the lower cutter is installed on the lower cutter fixing seat, the terminal is located on the lower cutter, and the plastic housing (HOUSING) for receiving the terminal is located on the opposite side of the terminal. The fixing mechanism is fixed, and the terminal is sent to the terminal placement position by a specially equipped manipulator (of course, manual work is also possible); the upper driving wheel is connected to the upper lever, and the front end of the upper lever is connected to an upper cutter slide seat, and the upper cutter slides through the upper cutter. The seat is fixed; the upper cutter slide seat and the lower cutter slide seat are connected with the pin insertion mechanism.

Further, the lower lever and the upper lever have the same structure, and both include a forearm and a rear arm. The forearm and the rear arm form an up and down staggered structure, and the two are connected as a whole by a bushing. The rear part of the rear arm is provided with a driving wheel follower wheel, and the driving wheel follower wheel is docked with the driving wheel; the upper lever and the lower lever are respectively movably fixed between the front plate and the rear plate through a guide shaft to form a lever structure.

Further, the upper cutter slide has a chute, and the roller at the front of the upper lever is stuck in the chute of the upper cutter slide to form a structure in which the upper cutter can move up and down; the lower cutter slide also has a chute , the roller shaft at the front part of the lower lever is stuck in the chute of the lower cutter slide seat to form a structure that the lower cutter can slide up and down.

Further, the upper driving wheel and the lower driving wheel have the same structure, and the surfaces of the wheel discs are all non-planar structures, but the thickness of the wheel discs is uniform, and there are upper convex parts and lower concave parts, upper convex parts and lower concave parts. The recesses alternate with each other, and the surface of the wheel disc is a smooth transition; the upper driving wheel and the lower driving wheel are arranged alternately; between the driving wheels, while the wheel disc of the lower driving wheel is stuck between the two driving wheel follower wheels of the lower lever; through the swinging rotation of the upper drive wheel and the lower drive wheel, the drive wheel follower wheel is converted into an upper lever and a lower lever The rocking action drives the upper and lower cutters to move up and down.

Further, the cam follower includes two rollers, both of which are installed at the head end of the force relief base, one of which is in contact with the pin push cam, and the other is in contact with the push rod.

Furthermore, a fixed block is provided on the lower plate, and the rear end of the force relief base is mounted on the fixed block through a fixed shaft to form a swingable structure.

Further, the upper lever, the lower lever and their guide shafts are respectively fixed by a guide sleeve.

Preferably, a photoelectric switch is installed on the front end of the main shaft, the photoelectric switch is close to the side of the main shaft, and the shading sheet matched with the photoelectric switch is fixed on the main shaft, and the photoelectric switch and the shading sheet are covered by a protective plate. There are two main functions of the photoelectric switch, one is to determine the relative zero point (main shaft, pin push cam and drive wheel); the other is to eliminate the cumulative error of the motor (servo motor) during operation by "returning to zero".

The present invention adopts the ordinary circular wheel with non-planar structure to drive the cutting terminal and the pin to drive the cam to drive the pin, so that the whole process can be carried out completely automatically, which avoids the disadvantages of the traditional use of multiple cam drives, and not only integrates the equipment The cost is reduced by about one-third, and the pin insertion speed is increased by more than 30%. At the same time, the pin insertion accuracy is also greatly improved, and the operation stability and service life of the equipment are improved.

Description of drawings

Fig. 1 is a structure diagram of the main part of the utility model;

Fig. 2 is the front structural diagram of the main part of the utility model;

Fig. 3 is a side structural view of the main part of the utility model;

Fig. 4 is an assembly structure diagram of the pin-pushing cam and the pin-inserting mechanism of the utility model;

Fig. 5 is a planar assembly diagram of the pin-pushing cam and the pin-inserting mechanism of the utility model;

Fig. 6 is an assembly structure diagram of the main shaft of the utility model, the upper and lower drive wheels and the pin push cam;

Fig. 7 is the installation structure drawing of the pin insertion mechanism of the utility model;

Fig. 8 is a lever structure diagram;

Fig. 9 is a timing diagram of the working process of the upper and lower drive wheels and gears.

In the figure, 1 is the motor, 2 is the coupling, 3 is the bearing seat, 4 is the lower plate, 5 is the main shaft, 6 is the rear plate, 7 is the front plate, 8 is the lower driving wheel, 9 is the pin push cam, 10 is an upper drive wheel, 11 is a pin mechanism, 12 is a drive plate, 13 is a push rod, 14 is a force unloading mechanism, 15 is a slide rail, 16 is a lower lever, 17 is a guide shaft, and 18 is a sliding seat of the lower cutter. 19 is a fixed column, 20 is a lower cutter fixing seat, 21 is a lower cutter, 22 is an upper lever, 23 is an upper movable knife slide seat, 24 is an upper movable knife, 25 is a terminal, 26 is a plastic shell, and 27 is a force relief base , 28 is a cam follower, 29 is a fixed shaft, 30 is a fixed block, 31 is a photoelectric switch, 32 is a light shield, 33 is a rear arm, 34 is a forearm, 35 is a shaft sleeve, 36 is a driving wheel follower wheel, 37 Be roller, and 38 are guide sleeves.

detailed description

In order to make the above purpose, features and advantages of the present utility model more obvious and understandable, the specific implementation of the present utility model will be described in detail below in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a full understanding of the present invention. However, the utility model can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific implementation disclosed below .

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the present invention. The terms used in the present utility model, such as "front", "rear", "upper", "lower", "left", "right", etc., are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. utility model.

In this embodiment, referring to Fig. 1, Fig. 2, Fig. 3, Fig. 4 and Fig. 5, the cam pin module,

Including motor 1, main shaft 5, driving wheel, pin pushing cam 9, pin mechanism 11 and cutter mechanism, main shaft 5 is connected to motor 1 through coupling 2, pin pushing cam 9 and driving wheel are installed on main shaft 5 Form coaxial fixation, the driving wheel is connected with a lever mechanism, the cutter mechanism is also connected with the lever mechanism, the pin pusher cam 9 is connected with a drive plate 12 through a force relief mechanism 14, the pin insertion mechanism 11 is connected with the drive plate 12, and the cutter The mechanism is docked with the pin mechanism 11; the drive plate 12 is installed on a pair of slide rails 15, and the force relief mechanism 14 includes a set of cam followers 28 and a swingable force relief base 27, and the cam follower 28 is fixed on the unloading base 27, and the cam follower 28 is docked with the pin push cam 9 on one side, and the other side is docked with a push rod 13, and the push rod 13 is fixed on the drive plate 12, and the drive plate 12 is connected with a reset device ( not shown in the figure); push the cam 9 through the pin to push the cam follower 28 to swing together with the unloading base 27, and the cam follower 28 drives the push rod 13 to move accordingly, thereby driving the drive plate 12 to advance, thereby pushing the pin The mechanism 11 advances to complete the operation of the plug-in terminal 25, and the drive plate 12 is reset by the reset device, thereby forming a reciprocating operation.

The main shaft 5 is fixed in the lower plate 4 through the bearing seat 3, and the front plate 7, the rear plate 6, the side plate (not shown) and the upper plate (not marked) are installed on the lower plate 4 to push the pins to the cam 9, The driving wheel, the lever mechanism and the force unloading mechanism 14 are covered inside, and the needle insertion mechanism 11 and the cutter mechanism are exposed outside the side plates; the slide rail 15 is installed on the rear plate 6 .

Referring to Fig. 1, Fig. 2, Fig. 6 and Fig. 7, described drive wheel comprises upper drive wheel 10 and lower drive wheel 8, and described lever mechanism comprises upper lever 22 and lower lever 16, and cutter mechanism comprises upper cutter 24 and the following cutter 21; the lower drive 8 wheels connect the lower lever 16, the lower lever 16 front ends connect the lower cutter slide 18, the lower cutter slide 18 is connected with the lower cutter holder 20, and the lower cutter 21 is installed on the lower cutter holder 20 On the top, the terminal 25 is located on the lower cutter 21, and the plastic shell 26 (ie HOUSING) for receiving the terminal 25 is located opposite to the terminal 25, and is fixed by a special fixing mechanism (not belonging to the scope of the present invention, not shown), and the terminal 25 is fixed by A specially equipped manipulator (not belonging to the scope of the present invention, not shown) is sent to the terminal placement position (of course, manual feeding is also possible); the upper driving wheel 10 is connected to the upper lever 22, and the front end of the upper lever 22 is connected to an upper cutter slide 23, The upper cutter 24 is fixed by the upper cutter slide 23; the upper cutter slide 23 and the lower cutter slide 18 are all connected with the pin insertion mechanism 11.

Referring to Fig. 1, Fig. 3 and Fig. 8, the lower lever 16 and the upper lever 22 have the same structure, and both include a forearm 34 and a rear arm 33, forming a vertically staggered structure between the forearm 34 and the rear arm 33, and the two are composed of a shaft Cover 35 is connected as a whole, forearm 34 front portion is provided with roller 37, and rear arm 33 rear portion is provided with drive wheel follower 36, and drive wheel follower 36 is docked with drive wheel; The shaft 19 is movably fixed between the front plate 7 and the rear plate 6 to form a lever structure.

Referring to Fig. 1, Fig. 7 and Fig. 8, the upper cutter slide 23 has a chute, and the roller 37 at the front of the upper lever 22 is stuck in the chute of the upper cutter slide 23 to form the upper cutter 24 which can move up and down. The structure of lower cutter slide 18 also has a chute, and the roller 37 of lower lever 16 front portion is stuck in the chute of lower cutter slide 18 and forms the structure that lower cutter 21 can slide up and down. Simultaneously, owing to the existence of the chute in the upper cutter slide 23 and the lower cutter slide 18, the upper cutter 24 and the lower cutter 21 can be driven by the upper cutter slide 23 and the lower cutter slide 18 on the drive plate 12. Do reciprocating movement.

With reference to Fig. 1, Fig. 6 and Fig. 8, described upper driving wheel 10 and lower driving wheel 8 have the same structure, and the surface of its wheel disc is non-planar structure, but the thickness of the wheel disc is uniform, and there are upper convex parts on it. and the lower concave portion, the upper convex portion and the lower concave portion alternately, and the surface of the wheel disc is a smooth transition; the upper driving wheel 10 and the lower driving wheel 8 are alternately arranged; the driving wheel follower wheel 36 is provided with two in parallel, and the upper driving wheel 10 The wheel disc of the upper lever 22 is stuck between the two driving wheel follower wheels 36 of the upper lever 22, and the wheel disc of the lower driving wheel 8 is stuck between the two driving wheel follower wheels 36 of the lower lever 16; The rocking rotation of lower driving wheel 16 is converted into the rocking action of upper lever 22 and lower lever 16 through driving wheel follower wheel 36 to drive the upper and lower cutters 24 and 21 to move up and down. The above driving wheel 10 is taken as an example. Specifically, when the upper convex portion in the wheel disc of the upper driving wheel 10 rotates between the driving wheel follower wheels 36, the tail end of the upper lever 22 is lifted, and the front end is pressed down, and the upper cutting knife 24 moves downward; Otherwise, when the lower recess in the wheel disc of last drive wheel 10 rotates between the drive wheel follower wheel 36, the tail end of upper lever 22 presses down, and the front end is upturned, and upper cutter 24 moves upwards. The principle of action of the lower cutter 21 and the lower drive wheel 8 is the same, the difference is that the upper drive wheel 10 and the lower drive wheel 8 are staggered, therefore, the action process of the lower cutter 21 and the upper cutter 24 is carried out in the opposite direction, that is, When the upper cutter 24 moves downward, the lower cutter 21 then moves upward.

Referring to Fig. 4 and Fig. 5, the cam follower 28 includes two rollers, all of which are installed on the head end of the force relief base 27, one of which is in contact with the pin pushing cam 9, and the other roller is in contact with the push rod 13 connect.

A fixed block 30 is arranged on the lower plate 4, and the rear end of the force relief base 27 is mounted on the fixed block 30 through a fixed shaft 29 to form a swingable structure.

Referring to FIG. 1 , the upper lever 22 , the lower lever 16 and the respective guide shafts 19 are respectively fixed by a guide sleeve 38 .

With reference to Fig. 1, Fig. 2 and Fig. 6, the front end of main shaft 5 is equipped with photoelectric switch 31, and photoelectric switch 31 is near the side of main shaft 5, and the shade 32 that matches with photoelectric switch 31 is then fixed on the main shaft 5, photoelectric switch 31 and The shading sheets 32 are covered together by a protective plate (not marked). The function of the photoelectric switch 31 mainly has two points, one is to determine the relative zero point (main shaft 5, pin push cam 9 and driving wheel); the other is to eliminate the motor 1 (servo motor) during operation cumulative error.

Action process description:

With reference to Fig. 9, setting pin promotes cam 9 and the timing of two driving wheels at 0° angle as initial position.

1. When the motor 1 rotates, when the angle reaches 21°, the lower driving wheel 8 leverages the lower lever 16 to move the lower cutter 21 upwards, and the lower cutter 21 starts to hold the material;

2. When the angle reaches 41°, the upper driving wheel 22 pries the upper cutter 24 to move downward through the upper lever 22, and the upper cutter 24 starts to cut material;

3. When the angle reaches 46°, the lower cutter 21 stops moving upwards, and the lower cutter 21 has held the terminal 25;

4. When the angle reaches 86°, the upper cutter 24 stops moving downwards, and the pin insertion cam 9 starts to push the pin insertion mechanism 11 to move, the terminal 25 has been cut off, and the pin insertion starts (at this time, the upper and lower cutters have clamped the terminal 25 );

5. When reaching an angle of 176°, the pin insertion mechanism 11 stops moving forward; the terminal has been inserted into the plastic housing (housing);

6. When the angle reaches 181°, the upper cutter 24 moves upward, the lower cutter 21 moves downward, and the upper and lower cutters open;

7. When the angle reaches 196°, push the pin insertion cam 9 to the pin insertion mechanism 11 and continue to move forward, and start riveting the terminal into the plastic shell;

8. When the angle reaches 201°, the upper cutter 24 stops moving upward, the lower cutter 21 stops moving downward, and the terminal 25 continues to be riveted into the plastic shell 26;

9. When the angle reaches 226°, the pin insertion mechanism 11 stops moving forward, and the terminal 25 continues to be riveted into the plastic shell 26;

10. When the angle reaches 246°, the lower cutter 21 continues to move downward, the terminal 25 continues to be riveted into the plastic shell 26, and the lower cutter 21 continues to open;

11. When reaching an angle of 261°, the pin insertion mechanism 11 starts to move backward, and the pin insertion and riveting are completed;

12. When reaching an angle of 266°, the lower cutter 21 stops moving downward, and the lower cutter 21 returns to the initial position;

13. When the angle reaches 271°, the upper cutter 24 stops moving upward, and the upper cutter 24 returns to the initial position;

14. When the angle reaches 341°, the needle insertion mechanism 11 stops moving backwards, and the needle insertion mechanism 11 returns to the initial position;

15. When the angle reaches 360°, the needle insertion mechanism 11 returns to the initial state.

At this point, a cycle of action is completed, and so on.

The technical features of the above-mentioned embodiments can be combined arbitrarily. To make the description concise, all possible combinations of the technical features in the above-mentioned embodiments are not described. However, as long as there is no contradiction in the combination of these technical features, should be considered as within the scope of this specification.

The utility model has been described in detail above. The above description is only a preferred embodiment of the utility model. When it cannot limit the scope of the utility model, all equivalent changes and modifications made according to the scope of the application should be Still belong to the scope covered by the present utility model.

Claims (10)

1. a kind of cam pin module, including contact pin mechanism and contact pin promote cam, it is characterised in that：Also include motor, master Axle, driving wheel and cutter mechanism, main shaft connect motor by shaft coupling, and contact pin promotes cam and driving wheel to be installed on shape on main shaft Fixed into coaxial, driving wheel is connected with leverage, cutter mechanism also connects the leverage, and contact pin promotes cam to pass through one Unload force mechanisms and be connected with a driving plate, contact pin mechanism is connected with the driving plate, and cutter mechanism is docked with contact pin mechanism；The driving Plate is installed on a pair of slide rails, described to unload force mechanisms and unload power base including one group of Cam Follower and one are swingable, cam with Dynamic device is fixed on and unloads on power base, and Cam Follower with contact pin while promote cam to dock, another side is docked with a catch bar, is pushed away Lever is fixed in the driving plate, and driving plate is connected with resetting means.

2. cam pin module according to claim 1, it is characterised in that：The main shaft is fixed on by bearing block In plate, foreboard, back plate, side plate and upper plate are installed in lower plate, contact pin is promoted cam, driving wheel, Lever machine by above-mentioned each plate Structure and unload including force mechanisms enclose and cover, contact pin mechanism and cutter mechanism are exposed to outside side plate；The slide rail is installed in back plate.

3. cam pin module according to claim 2, it is characterised in that：The driving wheel includes upper driving wheel and lower drive Driving wheel, the leverage includes upper lever and lower lever, and cutter mechanism includes upper cutter and lower cutter；Lower driving wheel connects Lower lever is connect, lower lever front end connects a lower cutter slide, and lower cutter slide is connected with lower cutter fixed seat, and lower cutter is installed on In lower cutter fixed seat, terminal is located on lower cutter；Upper driving wheel connects upper lever, and upper lever front end connects a upper cutter and slides Seat, upper cutter is fixed by upper cutter slide；Upper cutter slide and lower cutter slide are connected with contact pin mechanism.

4. cam pin module according to claim 3, it is characterised in that：The lower lever and upper lever have identical Structure, includes forearm and postbrachium, and structure straggly up and down is formed between forearm and postbrachium, and both are connected as a single entity by axle sleeve, Forearm front portion is provided with roller bearing, and postbrachium rear portion is provided with driving wheel supporting roller, and driving wheel is docked with wheel with the driving wheel；Upper lever and Lower lever is fixed on each via a guide shaft activity and lever construction is formed between foreboard and back plate.

5. cam pin module according to claim 4, it is characterised in that：Upper cutter slide has a chute, upper lever Anterior roller bearing forms upper cutter structure movable up and down in being stuck in the chute of upper cutter slide；Lower cutter slide also has one Chute, the anterior roller bearing of lower lever is stuck in the chute of lower cutter slide and forms lower cutter and can slide up and down structure.

6. cam pin module according to claim 4, it is characterised in that：The upper driving wheel and lower driving wheel have phase Same structure, its sheave surface is nonplanar structure, but the thickness of wheel disc is uniform, and upper convex portion and lower concave part are respectively provided with thereon, Upper convex portion and lower concave part are alternateed, and the surface of wheel disc is to seamlessly transit；Upper driving wheel and lower driving wheel are staggered；The drive Driving wheel supporting roller is parallel to be provided with two, and the wheel disc of upper driving wheel is stuck between two driving wheel supporting rollers of upper lever, and lower drive The wheel disc of driving wheel is then stuck between two driving wheel supporting rollers of lower lever；By swing turn of upper driving wheel and lower driving wheel It is dynamic to be converted into the rocking action of upper lever and lower lever through driving wheel supporting roller to drive moving up and down for upper cutter and lower cutter.

7. cam pin module according to claim 1, it is characterised in that：The Cam Follower includes two rollings Wheel, is mounted on unloading the head end of power base, and one of roller connects with contact pin promotion cam, another roller and catch bar phase Connect.

8. cam pin module according to claim 2, it is characterised in that：A fixed block is provided with lower plate, power bottom is unloaded The tail end of seat is installed on by a fixing axle and swingable structure is constituted on the fixed block.

9. cam pin module according to claim 5, it is characterised in that：Upper lever and lower lever and respective guide shaft it Between fixed by a guide pin bushing respectively.

10. cam pin module according to claim 1, it is characterised in that：Optoelectronic switch is installed in the front end of main shaft, Near the side of main shaft, the anti-dazzling screen matched with optoelectronic switch is then fixed on main shaft optoelectronic switch, optoelectronic switch and anti-dazzling screen Covered by a protection board together.