CN206194699U - SOT26 tests and presss from both sides with adjustable test recess - Google Patents

Abstract

The utility model discloses a SOT26 tests and presss from both sides with adjustable test recess belongs to chip testing technical field. The utility model discloses a SOT26 tests and presss from both sides with adjustable test recess, press from both sides including fixation clamp and activity, the fixation clamp is connected with the rotary device that the activity was pressed from both sides through mutually supporting to press from both sides the width regulation who realizes pressing from both sides mouthful for fixation clamp rotatory between the two through the activity, it mouthful can carry out adaptability according to SOT26's size and adjust to have realized that the test is pressed from both sides. The utility model discloses the double -layered application of test through SOT26's the ejecting step of -> test -> of impressing, utilizes spring control activity double -layered opening and closure to thereby the skew improves the yield of disposable test about compensateing that the SOT26 size of a dimension arouses, has installed the ejector pin simultaneously additional, in order to achieve the purposes,

Description

One kind test adjustable SOT26 test clips of groove

Technical field

The utility model is related to chip testing technology field, more particularly to a kind of test adjustable SOT26 test clips of groove.

Background technology

At present, it is necessary to be carried out further to the finished chip after cutting encapsulation in semiconductor integrated circuit manufacturing process Test, test fixture more serves key effect.In chip testing process, specific practice is by the suction nozzle of die selector Chip is transferred in test clip, after being completed, chip is transferred to subsequent processing by the suction nozzle of die selector again.

SOT is the abbreviation of English Small-outlinetransistor, refers to a kind of packing forms of transistor, SOT26 is the abbreviation of SOT23-6, and SOT23-6 is the one kind in SOT23, and mantissa 6 represents 6 pins；Survey designed by original equipment Examination folder, as shown in Fig. 2 the opening size of jaws (3) is fixed, and the length of SOT26 is due to the limitation of manufacturing technology level Property, cause its length inconsistent, therefore the test clip of original equipment design is designed by SOT26 length full-size, is thus made Into pin skew in contact test tablet or so of SOT26 products, so as to cause loose contact, under causing a power of the test Drop；The contact for how ensureing both sides pin and test piece and the pin of SOT26 is to be symmetrical set, during test is also technology people Member needs the technical problem for considering.

Through retrieval, Chinese invention patent application, publication number：CN105931979A, publication date：2016.09.07, disclose A kind of rotating down pressing cake core test fixture, including support, the support include the branch of base station and vertical shape with horizontal plane Strut；Open column shape support frame of the inwall with spiral lamination is fixed with the support bar；Also include that outer wall carries spiral lamination Lower pressure bar；The spiral lamination of the spiral lamination of support frame as described above inwall and the lower pressure bar outer wall is mutually matched；The lower pressure bar bottom End is provided with top testing needle, and the top end of the lower pressure bar is provided with handle；Chip is fixed with told base station Mounting table, the upper surface of the chip mounting table is provided with chip positioning bar, and chip mounting table is additionally provided with through hole, solid in through hole Surely there is bottom testing needle.The invention is applied to the test of unpackaged chip, and positioning and quick test can be carried out to chip, and need not Test pin is welded on chip, it is efficient and convenient to chip installing/dismounting, it is adaptable to large batch of test.But the invention Shen The base station of horizontal plane please can not be sized, and can only test the chip of fixed specification, and, it is only applicable to unpackaged chip Test, versatility is poor.

Utility model content

1. the utility model technical problem to be solved

The problem of SOT26 pins skew in contact test tablet or so when being tested for SOT26 present in prior art, The utility model provides a kind of test adjustable SOT26 test clips of groove.It can realize that test clip jaws can be according to SOT26 Size carry out adaptability regulation, reach the purpose for improving the average yield of test.

2. technical scheme

To reach above-mentioned purpose, the technical scheme that the utility model is provided is：

One kind test adjustable SOT26 test clips of groove, including geometrical clamp and activity are pressed from both sides；The geometrical clamp and activity folder are logical The whirligig connection for cooperating is crossed, and realizes the width of jaws between the two relative to the rotation of geometrical clamp by activity folder Regulation, realizing test clip jaws can carry out adaptability regulation according to the size of SOT26, and then reach the test for improving SOT26 The purpose of average yield.

Further technical scheme, whirligig be geometrical clamp, activity folder just to respective side on be respectively provided with and match somebody with somebody Close convex semicolumn, the recessed semicolumn for setting；The activity folder is hung on the convex semicolumn of geometrical clamp by recessed semicolumn, recessed semicircle Post rotates by axle of convex semicolumn, because the overall dimensions of SOT26 are smaller, without realizing big width adjusting, as long as geometrical clamp Retain the width adjusting that narrow and small gap is capable of achieving required jaws and activity folder between, therefore, recessed semicolumn is with convex half Cylinder rotates for axle, can realize the fine adjustment of the width of jaws.

Further technical scheme, the geometrical clamp is in inverted " t " word shape；The middle part that the activity folder hangs over geometrical clamp is convex The side of platform, and " L " shape rotary gap is left and geometrical clamp between, gap is L-shaped, realizes recessed semicolumn with convex semicolumn It is the small angle rotation of axle.

Further technical scheme, the latter half of the activity folder, the bottom of recessed semicolumn is provided with horizontal direction Spring cavity volume, the jaws width adjusting spring of built-in horizontal direction.After the completion of realizing that SOT26 is tested, the reset of jaws width, And jaws can be realized during test to the clamping force of SOT26, with the stability of position when ensureing that SOT26 is tested.

Further technical scheme, geometrical clamp middle part boss inside sets the push rod cavity volume of vertical direction, interior from the bottom to top Put the push rod spring and push rod of interconnection；Push rod is in "convex" shaped, and top passes the upper surface of geometrical clamp, in the middle of jaws Position, bottom be connect push rod spring tip-lever support, to ensure to be stuck in test clip after the completion of SOT26 product tests, And then reduce the stack alarm probability of bracket panel.

Further technical scheme, the upper surface of geometrical clamp sets fixed gripping finger, and the upper surface of the activity folder is set lives Dynamic gripping finger, fixed gripping finger groove and activity gripping finger groove are oppositely arranged, and can effectively avoid the SOT products packaged by some special leads frames The metal that two ends without pin are exposed, prevents product and periphery short circuit, and centre accommodates the jaws of SOT26 packaging bodies, presses SOT26 After entering jaws, groove and jaws act synergistically, and left offsets and can guarantee that SOT26 both sides pin and survey when preventing SOT26 from testing Test piece it is parallel, conveniently test and improve the precision of test.

Further technical scheme, the fixed gripping finger side relative with activity gripping finger be top opens outward two kinds are different The inclined-plane of angle, lower end angle of inclination is consistent with the shape of SOT26 packaging bodies, it is ensured that buffer-type pressure during SOT26 press-in jaws Enter, it is to avoid the contact really up to the mark of SOT26 packaging bodies and jaws plane and mutually damage, and further ensure press-in after stabilization Property.

Further technical scheme, the convex semicolumn is installed with hollow, the fixed pin holes of horizontal direction；Steady pin is in The horizontal insertion fixed pin holes of " T " font, top is fixedly connected with steady pin cap, and tail end connects after passing fixed pin holes with packing ring close-fitting Connect, to ensure to fix the stability parallel relation of gripping finger groove and activity gripping finger groove；Rotating to be for the recessed semicolumn turns 0 clockwise ~4 °, the size adjust automatically anglec of rotation according to SOT26, to adapt to various sizes of SOT26 products.

Further technical scheme, the tail end of the steady pin is also installed with fixed jack, and fixed jack is inserted into pin, and It is stained with glue and causes to fix the dislocation of gripping finger groove and activity gripping finger groove to avoid packing ring close-fitting from connecting loosening.

A kind of application for testing the adjustable SOT26 test clips of groove, applying step is：

The press-in of step one, SOT26：The SOT26 packaging bodies of SOT26 are pressed into the jaws of test clip, in process of press in, Activity folder turns clockwise relative to geometrical clamp, and the width of jaws gradually increases, and jaws width adjusting spring is gradually compressed, directly It is completely forced into the jaws of test clip to SOT26 packaging bodies, and remains pressed into formula and is fixed；

The test of step 2, SOT26：Each pin contact test tablet to SOT26 is tested one by one；

The ejection of step 3, SOT26：After the completion of test, separator suction nozzle rises, and the SOT26 products on suction nozzle are in vacuum And under the upper top effect of push rod, SOT26 is ejected, jaws width adjusting spring return function, the width of jaws recovers original width；

Step 4, repeat step one to three, test other SOT26.

Acted using unilateral movable folder, opening and closure using spring control activity folder, to make up SOT26 sizes The left and right for causing is offset so as to improve the yield of disposable test, while having installed push rod additional, to prevent product card in jaws, is reached To the purpose of automatic anti-stack；The synergy of activity folder and push rod, surveys when serving test to SOT26 duplicate protections and raising The purpose of yield is tried, equivalent to production capacity is improve, while essentially eliminating the hidden danger of stack, double effects for obtaining at one stroke has been reached.

3. beneficial effect

The technical scheme provided using the utility model, compared with prior art, is had the advantages that：

(1) a kind of test adjustable SOT26 test clips of groove of the present utility model, by activity folder relative to geometrical clamp The width adjusting of jaws between the two is realized in rotation, and realizing test clip jaws can carry out adaptability tune according to the size of SOT26 Section, and then reach the purpose of the average yield of test for improving SOT26；

(2) a kind of test adjustable SOT26 test clips of groove of the present utility model, because the overall dimensions of SOT26 are smaller (units grade), without realizing big width adjusting, as long as retaining narrow and small gap between geometrical clamp and activity folder The width adjusting of the jaws required for realizing, therefore, recessed semicolumn rotates by axle of convex semicolumn, can realize the width of jaws Fine adjustment；

(3) a kind of test adjustable SOT26 test clips of groove of the present utility model, gap is between activity folder and geometrical clamp " L " shape, realizes small angle rotation of the recessed semicolumn with convex semicolumn as axle；

(4) a kind of test adjustable SOT26 test clips of groove of the present utility model, the setting of jaws width adjusting spring, The reset of jaws width after the completion of SOT26 tests is realized, and can realize that jaws is to the clamping force of SOT26 during test, to protect The stability of position when card SOT26 is tested.；

(5) a kind of test adjustable SOT26 test clips of groove of the present utility model, the built-in push rod of geometrical clamp, it is ensured that Will not be stuck in test clip after the completion of SOT26 product tests, and then reduce the stack alarm probability of bracket panel；

(6) a kind of test adjustable SOT26 test clips of groove of the present utility model, after SOT26 press-in jaws, groove and folder Mouthful synergy, skew when preventing SOT26 from testing or so, to improve the precision of test；Groove can also be used for avoiding some The metal dots exposed of the SOT26 products without pin two ends packaged by special lead frame, to prevent product and test clip Short circuit；

(7) a kind of test adjustable SOT26 test clips of groove of the present utility model, fixed gripping finger and activity gripping finger side Angle of inclination is consistent with the shape of SOT26 packaging bodies, it is ensured that buffer-type press-in during SOT26 press-in jaws, it is to avoid SOT26 is encapsulated The contact really up to the mark of body and jaws plane and mutually damage, and further ensure press-in after stability；

(8) a kind of test adjustable SOT26 test clips of groove of the present utility model, the setting of steady pin ensure that solid Clamp refers to the stability parallel relation of groove and activity gripping finger groove；Rotating to be for recessed semicolumn turns 0~4 ° clockwise, according to SOT26 Size adjustment the anglec of rotation；To adapt to the SOT26 of different size；

(9) a kind of test adjustable SOT26 test clips of groove of the present utility model, the cooperation of fixed jack and pin sets Put, it is to avoid the connection of packing ring close-fitting loosens and causes to fix the dislocation of gripping finger groove and activity gripping finger groove；

(10) a kind of application for testing the adjustable SOT26 test clips of groove of the present utility model, it is dynamic using unilateral activity folder Make, opening and closure using spring control activity folder, the left and right caused with making up SOT26 sizes are offset so as to improve one The yield of secondary property test, while having installed push rod additional, to prevent product card in jaws, reaches the purpose of automatic anti-stack；Activity The synergy of folder and push rod, tests SOT26 duplicate protections and raising the purpose of yield, equivalent to raising when serving test Production capacity, while essentially eliminate the hidden danger of stack, has reached double at one stroke effects, through statistics, can at least improve 10% Production capacity, be a kind of significant progress for hundreds of millions of batch production of SOT26.

Brief description of the drawings

Fig. 1 is a kind of test adjustable SOT26 test clips structural representation of groove of the present utility model；

Fig. 2 is the structural representation of the SOT26 test clips of prior art；

Fig. 3 is the top view of SOT26 products；

Fig. 4 is the side view of SOT26 products；

Fig. 5 is the geometrical clamp profile in the utility model；

Fig. 6 is the activity folder profile in the utility model；

Fig. 7 is the activity folder stereogram in the utility model；

Fig. 8 is structural representation after the steady pin amplification in the utility model；

Fig. 9 is structural representation after the packing ring amplification in the utility model；

Figure 10 is the push rod structure schematic diagram in the utility model.

Label declaration in schematic diagram：1st, geometrical clamp；2nd, activity folder；3rd, jaws；4th, push rod；5th, steady pin；7th, packing ring；8、 SOT26；9th, rotary gap；11st, fixed gripping finger；12nd, convex semicolumn；14th, fixed gripping finger groove；15th, push rod cavity volume；16th, steady pin Hole；21st, activity gripping finger；22nd, recessed semicolumn；23rd, jaws width adjusting spring；24th, activity gripping finger groove；25th, spring cavity volume；41、 Tip-lever support；51st, fixed jack；52nd, steady pin cap；81st, SOT26 middle pins；82nd, SOT26 packaging bodies.

Specific embodiment

To further appreciate that content of the present utility model, the utility model is described in detail with reference to accompanying drawing.

The shape of SOT26 products is as shown in Figure 3,4.

Embodiment 1

The adjustable SOT26 test clips of test groove of the present embodiment, including geometrical clamp 1 and activity folder 2；The geometrical clamp 1 The whirligig for passing through to cooperate with activity folder 2 is connected, and as shown in Fig. 5,7, it is just right that whirligig is geometrical clamp 1, activity presss from both sides 2 Respective side on the convex semicolumn 12, the recessed semicolumn 22 that are respectively provided with and are equipped with；The activity folder 2 passes through recessed semicolumn 22 hang on the convex semicolumn 12 of geometrical clamp 1, and recessed semicolumn 22 is with convex semicolumn 12 for axle rotates.Realizing test clip jaws can Size according to SOT26 carries out adaptability regulation, and then reaches the purpose of the average yield of test for improving SOT26.Due to SOT26 Overall dimensions it is smaller, without realizing big width adjusting, if geometrical clamp 1 and activity folder 2 between retain narrow and small gap i.e. The width adjusting of required jaws 3 is capable of achieving, therefore, recessed semicolumn 22, for axle rotates, can realize folder with convex semicolumn 12 The fine adjustment of the width of mouth 3.

Embodiment 2

The adjustable SOT26 test clips of test groove of the present embodiment, basic structure is with embodiment 1, difference and improvements It is：As shown in figure 1, the geometrical clamp 1 is in inverted " t " word shape；The activity folder 2 hangs over the one of the middle part boss of geometrical clamp 1 Side, and " L " shape rotary gap 9 is left and geometrical clamp 1 between, gap is L-shaped, realizes recessed semicolumn 22 with convex semicolumn 12 It is the small angle rotation of axle.As shown in fig. 6, the latter half of the activity folder 2, the bottom of recessed semicolumn 22 is provided with level side To spring cavity volume 25, the jaws width adjusting spring 23 of built-in horizontal direction.After the completion of realizing that SOT26 is tested, jaws 3 is wide The reset of degree, and jaws 3 can be realized during test to the clamping force of SOT26, with the stability of position when ensureing that SOT26 is tested.

Embodiment 3

The adjustable SOT26 test clips of test groove of the present embodiment, basic structure is with embodiment 2, difference and improvements It is：As shown in figure 5, the middle part boss inside of geometrical clamp 1 sets the push rod cavity volume 15 of vertical direction, it is built-in from the bottom to top to be mutually connected The push rod spring and push rod 4 for connecing；As shown in Figure 10, push rod 4 is in "convex" shaped, and top passes the upper surface of geometrical clamp 1, near folder Position in the middle of mouth 3, bottom is the tip-lever support 41 for connecting push rod spring, to ensure to be stuck in after the completion of SOT26 product tests In test clip, and then reduce the stack alarm probability of bracket panel.The upper surface of geometrical clamp 1 sets fixed gripping finger 11, the activity The upper surface setting activity gripping finger 21 of folder 2, fixed gripping finger groove 14 and activity gripping finger groove 24 are oppositely arranged, and can effectively avoid some special The metal that two ends of the SOT products without pin packaged by different lead frame are exposed, prevents product and periphery short circuit, and centre accommodates The jaws 3 of SOT26 packaging bodies 82, after SOT26 is pressed into jaws, groove and jaws act synergistically, when preventing SOT26 from testing or so Skew, conveniently tests and improves the precision of test.The size of " L " shape rotary gap is 0.33mm.

The application of the test adjustable SOT26 test clips of groove of the present embodiment, application specification is the SOT26 of 3.0*1.6mm, ± 0.02~± 0.2, pin widths are 0.4mm to tolerance, and step is：

The press-in of step one, SOT26：The SOT26 packaging bodies 82 of SOT26 are pressed into the jaws 3 of test clip, process of press in In, activity folder 2 turns clockwise relative to geometrical clamp 1, and the anglec of rotation is 1.5~3.0 °, and the width of jaws 3 gradually increases, folder Mouth width adjusting spring 23 is gradually compressed, until SOT26 packaging bodies 82 are completely forced into the jaws 3 of test clip, and keeps pressure Enter formula to fix；

The test of step 2, SOT26：Each pin contact test tablet to SOT26 is tested one by one；

The ejection of step 3, SOT26：After the completion of test, separator suction nozzle rises, and product is on vacuum and the upper top of push rod 4 Under effect, product is ejected, the return of jaws width adjusting spring 23, the width of jaws 3 recovers original width；

Step 4, repeat step one to three, test other SOT26.

The adjustable SOT26 test clips of test groove of the present embodiment, are acted using unilateral movable folder, control to live using spring The opening of dynamic folder and closure, the left and right caused with making up SOT26 sizes offset so as to improve the yield of disposable test, together When installed push rod additional, to prevent product card in jaws, reach the purpose of automatic anti-stack；The collaboration of activity folder and push rod is made With to SOT26 duplicate protections and the purpose of test yield being improved when serving test, equivalent to production capacity is improve, while substantially The hidden danger of stack is eliminated, double effects for obtaining at one stroke have been reached.

Through statistics, the adjustable SOT26 test clips of test groove of the present embodiment, test yield improves 13%, equivalent to 13% production capacity can at least be improved.

Example：2016/4/21 statistics：

Embodiment 4

The adjustable SOT26 test clips of test groove of the present embodiment, basic structure is with embodiment 3, difference and improvements It is：Fixed gripping finger 11 and the relative side of activity gripping finger 21 are the double inclined plane of top opens outward, and lower inclined plane is 7 degree, upper oblique Face is 30 degree；Angle of inclination is consistent with the shape of SOT26 packaging bodies 82, it is ensured that buffer-type press-in during SOT26 press-in jaws, keeps away Exempt from the contact really up to the mark of SOT26 packaging bodies and jaws plane and mutually damage, and further ensure the stability after press-in.It is described Convex semicolumn 12 is installed with hollow, the fixed pin holes 16 of horizontal direction, diameter 1mm；As shown in Figure 8,9, steady pin 5 is in " T " word The horizontal insertion fixed pin holes 16 of shape, top is fixedly connected with steady pin cap 52, and tail end connects after passing fixed pin holes 16 with the close-fitting of packing ring 7 Connect, to ensure to fix the stability parallel relation of gripping finger groove 14 and activity gripping finger groove 24.The tail end of the steady pin 5 is also installed with solid Determine jack 51, fixed jack 51 is inserted into pin, then is clung with glue, geometrical clamp is caused to avoid the close-fitting of packing ring 7 from connecting loosening Refer to the dislocation of groove 14 and activity gripping finger groove 24.The size of " L " shape rotary gap is 0.23mm.

The application of the test adjustable SOT26 test clips of groove of the present embodiment, application specification is the SOT26 of 3.0*1.6mm, ± 0.01~± 0.1, step is tolerance：

The press-in of step one, SOT26：The SOT26 packaging bodies 82 of SOT26 are pressed into the jaws 3 of test clip, process of press in In, activity folder 2 turns clockwise relative to geometrical clamp 1, and the anglec of rotation is 0~1.5 °, and the width of jaws 3 gradually increases, jaws Width adjusting spring 23 is gradually compressed, until SOT26 packaging bodies 82 are completely forced into the jaws 3 of test clip, and remains pressed into Formula is fixed；

The test of step 2, SOT26：Each pin contact test tablet to SOT26 is tested one by one；

The ejection of step 3, SOT26：After the completion of test, separator suction nozzle rises, and the SOT26 products on suction nozzle are in vacuum And under the upper top effect of push rod 4, SOT26 is ejected, the return of jaws width adjusting spring 23, the width of jaws 3 recovers initial wide Degree；

Step 4, repeat step one to three, test other SOT26.

Through statistics, the adjustable SOT26 test clips of test groove of the present embodiment, test yield improves 15%, for It is a kind of significant progress for hundreds of millions of batch production of SOT26.

Schematically the utility model and embodiments thereof are described above, the description does not have restricted, accompanying drawing Shown in be also one of implementation method of the present utility model, actual structure is not limited thereto.So, if this area Those of ordinary skill enlightened by it, in the case where the invention objective is not departed from, designed and this without creative The similar frame mode of technical scheme and embodiment, all should belong to protection domain of the present utility model.

Claims (9)

1. a kind of test adjustable SOT26 test clips of groove, including geometrical clamp (1), it is characterised in that also including activity folder (2)； The geometrical clamp (1) and activity folder (2) are connected by the whirligig for cooperating, and by activity folder (2) relative to fixation The width adjusting of jaws (3) between the two is realized in the rotation for pressing from both sides (1).

2. one kind according to claim 1 tests the adjustable SOT26 test clips of groove, it is characterised in that：The rotating dress Be set to geometrical clamp (1), activity folder (2) just to respective side on the convex semicolumn (12), recessed half that are respectively provided with and are equipped with Cylinder (22)；Activity folder (2) is hung on the convex semicolumn (12) of geometrical clamp (1) by recessed semicolumn (22), recessed semicolumn (22) with convex semicolumn (12) for axle rotates.

3. one kind according to claim 2 tests the adjustable SOT26 test clips of groove, it is characterised in that：The geometrical clamp (1) in inverted " t " word shape；Activity folder (2) hangs over the side of the middle part boss of geometrical clamp (1), and and geometrical clamp (1) between Leave " L " shape rotary gap (9).

4. one kind according to claim 3 tests the adjustable SOT26 test clips of groove, it is characterised in that：The activity folder (2) the latter half, the bottom of recessed semicolumn (22) is provided with the spring cavity volume (25) of horizontal direction, the folder of built-in horizontal direction Mouth width adjusting spring (23).

5. one kind according to claim 3 tests the adjustable SOT26 test clips of groove, it is characterised in that：The geometrical clamp (1) inside middle sets the push rod cavity volume (15) of vertical direction, the push rod spring and push rod of built-in interconnection from the bottom to top (4)；In "convex" shaped, top passes the upper surface of geometrical clamp (1) to push rod (4), the position in the middle of jaws (3), and bottom is Connect the tip-lever support (41) of push rod spring.

6. one kind according to claim 5 tests the adjustable SOT26 test clips of groove, it is characterised in that：The geometrical clamp (1) upper surface sets fixed gripping finger (11), upper surface setting activity gripping finger (21) of activity folder (2), fixed gripping finger groove (14) it is oppositely arranged with activity gripping finger groove (24), forms the middle jaws (3) for accommodating SOT26 packaging bodies (82).

7. one kind according to claim 6 tests the adjustable SOT26 test clips of groove, it is characterised in that：Fixed gripping finger (11) and the relative side of activity gripping finger (21) is the inclined-plane of top opens outward, angle of inclination and SOT26 packaging bodies (82) Shape is consistent.

8. one kind according to claim 6 tests the adjustable SOT26 test clips of groove, it is characterised in that：The convex semicircle It is the fixed pin holes (16) of horizontal direction in the middle of post (12)；Steady pin (5) is in the horizontal insertion fixed pin holes (16) of " T " font, top Steady pin cap (52) is fixedly connected with, tail end passes fixed pin holes (16) and connected with packing ring (7) close-fitting afterwards, the recessed semicolumn (22) rotate to be turns 0~4 ° clockwise.

9. one kind according to claim 7 tests the adjustable SOT26 test clips of groove, it is characterised in that：The steady pin (5) tail end is also installed with fixed jack (51), and fixed jack (51) is inserted into pin, then is clung with glue.