CN216051417U - Defect identification device for PCB - Google Patents

Abstract

The utility model discloses a defect identification device for a PCB (printed circuit board), which comprises a guide block, a marking pen and a screwing mechanism, wherein a through hole for the marking pen to pass through is formed in the guide block; the guide block is further provided with a limiting groove matched with the limiting ring, the limiting groove limits the limiting ring to be close to or away from the marking pen, and therefore when the hand wheel or the rotary screw rotates in different directions, the holding block has a holding trend or a separation trend relative to the marking pen. The marking pen can be conveniently locked or unscrewed through the hand wheel, so that the marking pen can be conveniently installed, detached and replaced.

Description

Defect identification device for PCB

Technical Field

The utility model relates to the field of mechanical adjustment, in particular to a defect identification device for a PCB (printed circuit board).

Background

Because use optical detection equipment to accomplish the back that detects to the PCB board, need carry out the sign to the defect that exists on the PCB board to carry out next process and discern and overhaul the place that has the defect promptly to the PCB board, consequently, need use the marker pen to carry out quick, accurate sign to the position that has the defect on the PCB board.

At present, a marking pen in the prior art is held tightly and fixed in a three-point screw locking mode, after the marking pen is used up, when a new marking pen is replaced, the holding screws in three different directions and the compression screws above the holding screws need to be removed, the time consumed for replacing the marking pen is long, and a professional tool is also needed.

In addition, the marking pen commonly used in the prior art adopts two groups of cylinders to switch sealing, pentaerythritol fatty acid ester is added into the marking pen to prevent dry and exhausted pen points, when the ink in the marking pen is used up, the steps of replacing the marking pen are more complicated, and the problem that the marking pen is more difficult to replace is caused. The prior art still adopts the mode that has the sealed film of cross opening in the setting of marker pen nib end, and this kind of method also has certain problem, when the marker pen frequently stretches into when stretching out, can omit the printing ink of nib on the cross film, after the time is of a specified duration, can gather a large amount of printing ink on the film, and these printing ink will drip on the PCB board to pollute the PCB board, lead to the PCB board to scrap.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a defect identification device for a PCB (printed circuit board), which has the following specific technical scheme:

the utility model provides a defect identification device for a PCB (printed circuit board), which comprises a guide block, a marking pen and a screwing mechanism for fixedly installing the marking pen, wherein a through hole for the marking pen to pass through is formed in the guide block, the screwing mechanism comprises a hand wheel, a holding block, a rotating screw rod and a limiting ring fixedly sleeved on the rotating screw rod, the holding block is arranged in the through hole, an arc surface structure for being attached to the marking pen is arranged on the inner side of the holding block, one end of the rotating screw rod is fixedly connected with the hand wheel, and the other end of the rotating screw rod passes through the side wall of the guide block and is in threaded fit connection with the outer side of the holding block;

the guide block is further provided with a limiting groove matched with the limiting ring, the limiting groove limits the limiting ring to be close to or far away from the marking pen, and therefore when the hand wheel or the rotary screw rotates in different directions, the holding block has a close tendency or a separation tendency relative to the marking pen.

The marking pen can be conveniently locked or unscrewed through the hand wheel, so that the marking pen can be conveniently installed, detached and replaced.

Further, the defect identification device also comprises a calibration ruler which is arranged on the guide block and extends in the height direction, and the calibration ruler is used for determining the installation height of the marking pen when the marking pen with the same specification is replaced; and/or the presence of a catalyst in the reaction mixture,

the pen body of the marking pen is of a narrowing structure in the direction far away from the pen head.

Furthermore, the defect identification device also comprises a support and a driving mechanism, wherein a guide rail is arranged on the support, the guide block is matched with the guide rail, the marking pen is fixedly connected with the guide block, and a sleeve matched with the pen end of the marking pen is also arranged on the support;

the power output end of the driving mechanism is fixedly connected with the guide block, and the guide block drives the marking pen to move along the guide rail under the driving of the driving mechanism, so that the marking pen can be switched from a first state to a second state;

when the marking pen is in a first state, the pen end of the marking pen retracts into the sleeve; when the marking pen is in the second state, the pen end of the marking pen extends out of the sleeve.

Further, the defect identification device also comprises a cover body matched with the end part of the sleeve;

when the marking pen is in a first state, the cover body is connected with the sleeve; when the marker pen is in the second state, the cover body is separated from the sleeve. Namely, when the marking pen works, the cover body is separated from the sleeve; when the marking pen is not in work, the cover body is closed, so that the problem of ink evaporation when the marking pen is not used for a long time is solved. The above process can be realized by manual operation, and can also be realized by the following scheme.

Furthermore, the defect identification device further comprises a connecting rod and a limiting piece, the cover body is arranged at one end of the connecting rod, and the other end of the connecting rod is rotatably connected with the bracket;

the position of the limiting piece is fixed relative to the guide block, and one side of the limiting piece, which is far away from the guide block, is always in contact with the connecting rod;

when the marking pen is in a first state, the cover body is in sealing connection with the end part of the sleeve;

when the marking pen is switched from the first state to the second state, the limiting piece pushes the connecting rod to rotate in the direction away from the sleeve, and the cover body is driven to leave the area opposite to the pen end when or before the pen end of the marking pen reaches the end face of the sleeve.

Furthermore, the cover body is arranged at the lower port of the sleeve, and a groove is formed in the upper surface of the cover body. When the marker pen leaks ink, the groove can contain certain ink, and the ink is prevented from falling to the PCB, so that the PCB is prevented from being polluted.

Further, the defect identification device further comprises a first return spring, one end of the first return spring is fixedly connected with the support, the other end of the first return spring is fixedly connected with the guide block or the marking pen, and when the marking pen is in a first state, the first return spring is in a natural state.

Further, the defect identifying device also comprises a second return spring and/or a buffer pad and/or a ring body with a brush, wherein,

one end of the second return spring is fixedly connected with the bracket, the other end of the second return spring is fixedly connected with the connecting rod, and when the marking pen is in the first state, the second return spring is in a natural state;

the buffer pad is an elastic annular structure and is arranged on the lower port edge of the sleeve and/or the upper edge of the cover body;

the ring body is arranged at the upper port of the sleeve, and the brush of the ring body is arranged on the side wall of the marking pen.

Furthermore, the driving mechanism of the defect identification device is an air cylinder, the power output end of the air cylinder is connected with a floating joint, and the floating joint is fixedly connected with the guide block.

Further, defect identification means still includes mounting panel and first locking screw, be equipped with on the mounting panel with first locking screw complex screw hole, be equipped with on the support with the bar-shaped adjusting through hole of first locking screw adaptation, first locking screw is used for compressing tightly support and mounting panel, just first locking screw can be located the arbitrary position of bar-shaped adjusting through hole.

Further, defect identification means still includes mounting base and second locking screw, be equipped with on the mounting base with second locking screw complex screw hole, be equipped with on the mounting panel with the arc adjusting hole of second locking screw adaptation, second locking screw is used for compressing tightly mounting panel and mounting base, just second locking screw can be located arbitrary position of arc adjusting hole.

Further, the mounting base is mounted on an optical head of the optical detection device, and an optical center of the optical head shoots light rays to intersect with a pen end of the marking pen in the second state.

The technical scheme provided by the utility model has the following beneficial effects:

a. the marking pen can be conveniently locked or unscrewed through the hand wheel, so that the marking pen can be conveniently installed, detached and replaced;

b. the problem of pen point exhaustion is solved, certain printing ink can be contained, and the PCB is prevented from being polluted;

c. the marking pen is designed to be of a structure with a thin upper part and a thick lower part, so that the problem of displacement of the marking pen caused by acting force between the marking pen and the PCB is effectively solved, and the effectiveness of marking is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a general schematic diagram of a defect identification apparatus provided in an embodiment of the present invention;

FIG. 2 is a schematic view of the defect identifying apparatus of FIG. 1 with the mounting component removed;

FIG. 3 is a schematic diagram of a defect identification apparatus in a marking operation state according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a front view of a defect identification device provided in an embodiment of the present invention in an inoperative state at an initial position;

FIG. 5 is a schematic side cross-sectional view of a defect identification device provided in an embodiment of the present invention in an inoperative state in an initial position;

FIG. 6 is an enlarged view of portion A of FIG. 5;

FIG. 7 is an enlarged view of portion B of FIG. 5;

FIG. 8 is a first partial schematic view of a defect identification apparatus provided in accordance with an embodiment of the present invention;

fig. 9 is a second partial schematic view of a defect identification apparatus according to an embodiment of the present invention.

Wherein the reference numerals include: 1-bracket, 3-first return spring, 4-calibration scale, 5-guide block, 7-guide rail, 8-sleeve, 81-cover body, 811-groove, 9-power mechanism, 10-marker pen, 11-floating joint, 13-second return spring, 14-connecting rod, 15-ring body, 16-limiting piece, 19-holding block, 20-limiting ring, 22-hand wheel, 23-rotating screw rod, 25-mounting base, 26-mounting plate, 27-second locking screw and 28-first locking screw.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.

In one embodiment of the present invention, a defect identification apparatus for a PCB circuit board is provided for use with an external movable inspection device optical assembly (not shown) including a CCD, lens, etc.

As shown in fig. 1, the defect identification apparatus includes a mounting base 25, a mounting plate 26, and a bracket 1, where the mounting base 25 and the mounting plate 26 are mounting components, the mounting base 25 is fixedly connected to the optical component of the detection device, i.e., the optical head, the mounting plate 26 is fixedly connected to the mounting base 25, and the bracket 1 is fixedly connected to the mounting plate 26.

Specifically, a second threaded hole is formed in the mounting base 25, the second threaded hole is used in cooperation with a second locking screw 27, an arc-shaped adjusting through hole adapted to the second locking screw 27 is formed in the mounting plate 26, the specific manner of the adaptation is that the diameter of the head of the second locking screw 27 is greater than the width of the arc-shaped adjusting through hole, that is, the tail of the second locking screw 27 can pass through the arc-shaped adjusting through hole to be connected with the second threaded hole in a matching manner, and the head of the second locking screw 27 does not pass through the arc-shaped adjusting through hole, so that the mounting plate 26 can be pressed and fixed on the mounting base 25 by the second locking screw 27, and in response to the second locking screw 27 being located at different positions of the arc-shaped adjusting through hole, the mounting plate 26 and the mounting base 25 have different positional relationships, to meet the need for identifying defects.

Similarly, the mounting plate 26 is provided with a first threaded hole, the first threaded hole is used in cooperation with a first locking screw 28, the bracket 1 is provided with a strip-shaped adjusting through hole adapted to the first locking screw 28, the specific manner of adaptation may be that the diameter of the head of the first locking screw 28 is larger than the width of the strip-shaped adjusting through hole, that is, the tail of the first locking screw 28 can pass through the strip-shaped adjusting through hole to be in fit connection with the first threaded hole, and the head of the first locking screw 28 does not pass through the strip-shaped adjusting through hole, so that the first locking screw 28 can press and fix the bracket 1 on the mounting plate 26, and, in response to the first locking screw 28 passing through different positions of the strip-shaped adjusting through hole, the mounting plate 26 and the bracket 1 have different positional relationships, to meet the need for identifying defects.

It should be noted that the number of the first locking screw 28 and the first threaded hole, the number of the second locking screw 27 and the number of the second threaded hole are not specifically limited, and the above mentioned adapting manners of the first locking screw 28 and the arc-shaped adjusting through hole, and the second locking screw 27 and the strip-shaped adjusting through hole are all exemplified, and the specific manners are selected according to practical applications, and do not limit the protection scope of the present invention.

As shown in fig. 2 to 4, the defect identification apparatus further includes a guide rail 7 disposed on the bracket 1, and a guide block 5, a driving mechanism 9, and a floating joint 11 that are engaged with the guide rail 7, where in this embodiment, the driving mechanism 9 is an air cylinder, a power output end of the air cylinder is connected to the floating joint 11, the floating joint 11 is fixedly connected to the guide block 5, and the air cylinder drives the floating joint 11 to move, so that the guide block 5 moves along a guide rail direction of the guide rail 7.

As shown in fig. 2-4, the defect identifying apparatus further includes a marking pen 10 and a tightening mechanism for performing a fixed mounting operation on the marking pen 10. Specifically, as shown in fig. 5 to 9, a through hole for the marking pen 10 to pass through is formed in the guide block 5, and the tightening mechanism includes a hand wheel 22, a clasping block 19, a rotating screw 23, and a limiting ring 20 fixedly sleeved on the rotating screw 23.

The clasping block 19 is arranged in the through hole, the inner side of the clasping block is provided with an arc-shaped structure used for being attached to the marking pen 10, one end of the rotary screw 23 is fixedly connected with the hand wheel 22, and the other end of the rotary screw penetrates through the side wall of the guide block 5 and is connected with the outer side of the clasping block 19 in a threaded fit manner. The guide block 5 is further provided with a limiting groove matched with the limiting ring 20, the limiting groove can limit the limiting ring 20 to be close to or far away from the marking pen 10, and therefore when the hand wheel 22 or the rotary screw 23 rotates in different directions, the holding block 19 has a close tendency or a separation tendency relative to the marking pen 10.

As shown in fig. 2 and 3, the holder 1 is further provided with a sleeve 8 which is matched with the pen end of the marking pen 10. The marking pen 10 has a first state and a second state, wherein when the marking pen 10 is in the first state, the pen end of the marking pen 10 is retracted inside the sleeve 8; when the marking pen 10 is in the second state, the pen end of the marking pen 10 extends out of the sleeve 8 and contacts the area position, opposite to the optical head, on the current PCB to be detected.

As shown in fig. 2 and 3, the defect identification apparatus further includes a cover 81 engaged with an end of the sleeve 8. When the marker pen 10 is in the first state, the cover 81 is connected with the sleeve 8; when the marker pen 10 is in the second state, the cover 81 is separated from the sleeve 8.

As shown in fig. 2 to 4, the defect identification apparatus further includes a connecting rod 14 and a limiting member 16, the cover 81 is disposed at one end of the connecting rod 14, and the other end of the connecting rod 14 is rotatably connected to the bracket 1. The position of the limiting member 16 is fixed relative to the guide block 5, and one side of the limiting member 16 away from the guide block 5 is always in contact with the connecting rod 14.

Specifically, when the marker pen 10 is in the first state, the cover 81 is in sealed connection with the end of the sleeve 8; when the marking pen 10 is switched from the first state to the second state, the limiting member 16 pushes the connecting rod 14 to rotate in a direction away from the sleeve 8, and drives the cover 81 to leave the area opposite to the pen end when or before the pen end of the marking pen 10 reaches the end surface of the sleeve 8.

As shown in fig. 2 to 7, the defect identifying apparatus further includes a first return spring 3 and a second return spring 13. As shown in fig. 2, one end of the first return spring 3 is fixedly connected to the bracket 1, and the other end thereof is fixedly connected to the guide block 5 or the marking pen 10. As shown in fig. 4, one end of the second return spring 13 is fixedly connected to the bracket 1, and the other end thereof is fixedly connected to the connecting rod 14.

In the present embodiment, when the marker pen 10 is in the first state, the first return spring 3 and the second return spring 13 are both in a natural state. During the process of switching the marking pen 10 from the first state to the second state, the first return spring 3 and the second return spring 13 are both in a stretched state. Obviously, changing the setting positions of the first return spring 3 and the second return spring 13 can make the marking pen 10 in the compressed state during the switching from the first state to the second state; the first return spring 3 and the second return spring 13 are two independent components, and the arrangement of the stretched position of one of them and the stretched position of the other is also an embodiment that can realize the technical scheme of the utility model.

In addition, as shown in fig. 2, the defect identifying apparatus further includes a cushion, a ring body 15 with a brush. The buffer pad is an elastic ring structure, and is disposed on the lower port edge of the sleeve 8 and/or the upper edge of the cover 81, so as to play a buffering role and a sealing role. The ring body 15 is arranged at the upper port of the sleeve 8, and the brush of the ring body is arranged on the side wall of the marking pen 10 and used for preventing dust from falling into the sleeve.

Specifically, when a defect mark needs to be performed on a PCB, under the driving of the cylinder, the guide block 5 drives the marking pen 10 to move downward along the guide rail 7, so that the marking pen 10 can be switched from a first state to a second state, and the pen end of the marking pen 10 intersects with the optical center of the optical head, so that the marking pen 10 can perform the defect mark on the PCB, and after the mark is completed, the marking pen 10 is switched from the second state to the first state.

In one embodiment of the present invention, as shown in fig. 2 to 4, the defect identifying apparatus further includes a calibration ruler 4 installed on the guide block 5 and extending in a height direction, the calibration ruler being used to determine an installation height of the marking pen 10 when the same specification is replaced.

It should be noted that, when the marking pen 10 is in operation, the marking pen 10 is slightly displaced by the PCB reaction force generated in the process due to frequent contact with the PCB for marking, so that the structure of the novel marking pen provided by the present invention is thin and thick, that is, the pen body of the marking pen 10 is narrowed in the direction away from the pen point, which can effectively avoid the above situation.

In an embodiment of the present invention, as shown in fig. 5 to 7, a groove 811 is formed on the upper surface of the cover 81, and when ink leaks from the marking pen 10, the leaked ink can be contained in the groove 811, so as to prevent the PCB from being contaminated.

In one embodiment of the present invention, a defect identifying apparatus for a PCB circuit board is provided, which includes a bracket 1, a reset bracket, a first reset spring 3, a guide block 5, a marking pen 10, a cylinder, a floating joint 11, a sleeve 8, a link 14, a second reset spring 13, and the like.

Wherein, install guide rail 7 on the support 1, marker pen 10 installs in guide block 5 the inside, and guide block 5 passes through the slider to be installed on guide rail 7 to can slide along guide rail 7, install stop screw at the 7 lower extremes of guide rail, slider roll-off guide rail 7 when preventing to install marker pen 10.

The cylinder is fixedly arranged on the support 1 through the auxiliary support, the extending end of the cylinder is connected with the floating joint 11, the floating joint 11 is fixedly connected with the guide block 5, and the floating joint 11 can allow the extending track of the cylinder and the moving track of the guide block 5 to have a smaller angle deviation, so that the service life of the cylinder is prolonged.

Reset support fixed connection on support 1, 3 one ends of first reset spring are connected on the support that resets, and the other end is connected on guide block 5, and its effect is balancing marker pen 10's weight when marker pen 10 is from non-operating condition (be the second state) to operating condition (be the first state) for the cylinder can be relaxed drive marker pen 10 and reset.

The sleeve 8 is fixedly connected to the bottom of the holder 1, and a ring body 15 with a brush, i.e., a ring, is bonded to the upper end of the sleeve 8, and the brush on the ring can prevent dust from falling into the sleeve 8 and can perform upper surface sealing on the nib part of the marker pen 10.

As shown in fig. 3, the connecting rod 14 is rotatably connected to the bracket 1 through a bearing, a connecting block is fixedly installed at the lower end of the guide block 5, a roller with an inner bearing, i.e., a limiting member 16, is connected to the connecting rod 14, the roller is always in contact with the connecting rod 14, one end of the second return spring 13 is connected to the bracket 1, and the other end of the second return spring is connected to the connecting rod 14, when the marker pen 10 is in a working state, the second return spring 13 is tensioned, and when the cylinder drives the guide block 5 with the marker pen 10 installed thereon to return to a non-working state, the second return spring 13 pulls the connecting rod 14 to an initial position, i.e., a position shown by the connecting rod 14 in fig. 2, so that the bottom of the sleeve 8 is sealed by the cover 81 at the bottom of the connecting rod 14.

As shown in fig. 3, a circular groove 811 is further provided on the cover 81, which is a sealing plate of the bottom plate of the connecting rod 14, so that when ink leakage occurs in the marker pen 10, the leaked ink can be accommodated in the circular groove 811, thereby preventing the PCB from being contaminated. In addition, a rubber buffer pad is bonded at the bottom of the sleeve 8, so that the impact on the sleeve 8 when the connecting rod 14 is reset can be buffered, the buffer pad is made of rubber, the sealing effect can be better realized, the sleeve 8 is sealed up and down through the ring body 15 and the buffer pad, and the problem of drying of the pen point of the marking pen 10 caused by air convection is avoided;

as shown in fig. 4-8, the tightening mechanism includes a handwheel 22, a limiting ring 20, a limiting pin, a clasping block 19, and a rotating screw 23, the handwheel 22 is fixedly connected with one end of the rotating screw 23, the other end of the rotating screw 23 is connected with the clasping block 19, the clasping block 19 is provided with an arc surface to increase the contact area with the marking pen 10, the limiting ring 20 is installed in the middle of the rotating screw 23, the limiting ring 20 is arranged inside the guide block 5, the limiting ring 20 is provided with a groove capable of placing the limiting pin, when the limiting pin is arranged in the groove, the limiting ring 20 is fixed with the rotating screw 23, so that the rotating screw 23 and the limiting ring 20 can only do rotation movement and can not move left and right, and two outer side surfaces of the limiting ring 20 are in contact with the inner side surface of the limiting groove wall of the guide block 5, and have a certain friction force, when the handwheel 22 is tightened by hand, the holding block 19 holds one side of the marking pen 10, and the other side of the marking pen 10 is in contact with the guide block 5, so that the marking pen 10 can be fixed in the guide block 5.

Still install calibration scale 4 on guide block 5, calibration scale 4's up end and marker pen 10 upper end flush, after the printing ink of marker pen 10 has used up, unscrew hand wheel 22, take out old marker pen 10, then put into guide block 5 the inside with new marker pen 10, guarantee that calibration scale 4's up end and marker pen 10's up end flush, screw up hand wheel 22 at last, fix new marker pen 10. As shown in fig. 8, a U-shaped groove and a screw adapted to the U-shaped groove are further disposed on the calibration ruler 4, and when the lengths of the marking pens 10 before and after replacement are different, the relative positions of the calibration ruler 4 and the guide block 5 can be adjusted, so that the marking positions of the marking pens 10 on the PCB are consistent with the image capturing positions of the CCD.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing is directed to embodiments of the present application and it is noted that numerous modifications and adaptations may be made by those skilled in the art without departing from the principles of the present application and are intended to be within the scope of the present application.

Claims (12)

1. A defect identification device for a PCB is characterized by comprising a guide block (5), a marking pen (10) and a screwing mechanism, a through hole for one end of the marking pen (10) to pass through is arranged on the guide block (5), the tightening mechanism is used for fixing the marking pen (10) in the through hole and comprises a hand wheel (22), a clasping block (19), a rotating screw rod (23) and a limiting ring (20) fixedly sleeved on the rotating screw rod (23), wherein the clasping block (19) is arranged in the through hole, and the inner side of the clasping block is provided with an arc surface structure for being attached to the marking pen (10), one end of the rotary screw rod (23) is fixedly connected with the hand wheel (22), and the other end of the rotary screw rod penetrates through the side wall of the guide block (5) and is in threaded fit connection with the outer side of the clasping block (19);

the guide block (5) is further provided with a limiting groove matched with the limiting ring (20), the limiting groove limits the limiting ring (20) to be close to or far away from the marking pen (10), and therefore when the hand wheel (22) or the rotary screw (23) rotates in different directions, the holding block (19) has a holding trend or a separation trend relative to the marking pen (10).

2. The defect identifying device according to claim 1, further comprising a support (1) and a driving mechanism (9), wherein a guide rail (7) is arranged on the support (1), the guide block (5) is in sliding fit with the guide rail (7), a power output end of the driving mechanism (9) is fixedly connected with the guide block (5), and the marking pen (10) is driven by the guide block (5) to move along the guide rail (7) under the driving of the driving mechanism (9).

3. Defect identification device according to claim 1, characterized in that it further comprises a calibration ruler (4) mounted on the guide block (5) and extending in the height direction, for determining its mounting height when changing marking pens (10) of the same specification; and/or the presence of a catalyst in the reaction mixture,

the pen body of the marking pen (10) is of a narrowing structure in the direction far away from the pen head.

4. The defect marking device according to claim 2, wherein the bracket (1) is further provided with a sleeve (8) matched with the pen end of the marking pen (10), and the defect marking device further comprises a cover body (81) matched with the end part of the sleeve (8);

the marking pen (10) can be switched from a first state to a second state under the driving of the driving mechanism (9);

when the marking pen (10) is in a first state, the pen end of the marking pen (10) retracts into the sleeve (8), and the cover body (81) is connected with the sleeve (8); when the marking pen (10) is in the second state, the cover body (81) is separated from the sleeve (8), and the pen end of the marking pen (10) extends out of the sleeve (8).

5. The defect identifying device according to claim 4, further comprising a connecting rod (14) and a limiting member (16), wherein the cover body (81) is arranged at one end of the connecting rod (14), and the other end of the connecting rod (14) is rotatably connected with the bracket (1);

the position of the limiting piece (16) is fixed relative to the guide block (5), and one side, far away from the guide block (5), of the limiting piece (16) is always in contact with the connecting rod (14);

when the marking pen (10) is in a first state, the cover body (81) is in sealed connection with the end part of the sleeve (8);

when the marking pen (10) is switched from the first state to the second state, the limiting piece (16) pushes the connecting rod (14) to rotate in a direction away from the sleeve (8), and drives the cover body (81) to leave an area opposite to a pen end when or before the pen end of the marking pen (10) reaches the end face of the sleeve (8).

6. Defect identification device according to claim 4, characterized in that said cover (81) is arranged at the lower port of said sleeve (8), the upper surface of said cover (81) being provided with a groove (811).

7. Defect identification device according to claim 2, characterized in that it further comprises a first return spring (3), one end of said first return spring (3) being fixedly connected to said support (1) and the other end thereof being fixedly connected to said guide block (5) or marking pen (10), and said first return spring (3) being in a natural state when said marking pen (10) is in a first state.

8. Defect identification device according to claim 5, characterized in that the defect identification device further comprises a second return spring (13) and/or a cushion and/or a ring with brush (15), wherein,

one end of the second return spring (13) is fixedly connected with the bracket (1), the other end of the second return spring is fixedly connected with the connecting rod (14), and when the marking pen (10) is in the first state, the second return spring (13) is in a natural state;

the buffer pad is an elastic annular structure and is arranged on the lower port edge of the sleeve (8) and/or the upper edge of the cover body (81);

the ring body (15) is arranged at the upper end opening of the sleeve (8), and the brush of the ring body is arranged on the side wall of the marking pen (10).

9. Defect identification device according to claim 2, characterized in that the driving mechanism (9) is a pneumatic cylinder, the power output end of which is connected with a floating joint (11), the floating joint (11) being fixedly connected with the guide block (5).

10. The defect identifying device of claim 2, further comprising a mounting plate (26) and a first locking screw (28), wherein a threaded hole matched with the first locking screw (28) is formed in the mounting plate (26), a strip-shaped adjusting through hole matched with the first locking screw (28) is formed in the bracket (1), the first locking screw (28) is used for pressing the bracket (1) and the mounting plate (26), and the first locking screw (28) can be located at any position of the strip-shaped adjusting through hole.

11. The defect identifying device of claim 10, further comprising a mounting base (25) and a second locking screw (27), wherein a threaded hole matched with the second locking screw (27) is formed in the mounting base (25), an arc-shaped adjusting through hole matched with the second locking screw (27) is formed in the mounting plate (26), the second locking screw (27) is used for pressing the mounting plate (26) and the mounting base (25), and the second locking screw (27) can be located at any position of the arc-shaped adjusting through hole.

12. Defect identification device according to claim 11, characterized in that the mounting base (25) is mounted on an optical head of an optical inspection apparatus, and that the optical center of the optical head shoots light rays to meet the pen end of the marking pen (10) in the second state.

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