CN116148505A - PCB board circuit automatic detection device - Google Patents

Abstract

The invention discloses a PCB circuit automatic detection device, which is characterized in that it includes: a cabinet mechanism; a clamp mechanism, which has a platform component and a clamping station that is arranged on the platform component and forms a PCB board positioning station between the platform component and the platform component. The assembly is connected with a first turntable at the bottom of the platform assembly, and is installed on the cabinet mechanism through the first turntable; the multi-axis slide mechanism is arranged on the cabinet mechanism and is located around the PCB board positioning station; and the probe The needle mechanism is arranged on the multi-axis sliding table mechanism, and the multi-axis sliding table mechanism drives the probe mechanism to move relative to the PCB board positioning station, so as to detect each solder spot of the PCB board on the PCB board positioning station. The invention can reduce labor intensity, and has the characteristics of high testing efficiency and high testing quality.

Description

PCB board circuit automatic detection device

technical field

The invention relates to the field of circuit testing devices, in particular to an automatic detection device for PCB circuit.

Background technique

With the development of science and technology, PCB boards are widely used in electronic products, and inspection has become an important means of quality control, and its significance is very important. The detection of PCB can be roughly divided into two categories: electrical test method and visual test method. Vision testing finds defects by visually inspecting features of electronic components as well as features of printed wiring. Visual testing is generally performed manually. This method relies on a series of problems such as human subjective error, high long-term cost, intermittent defect detection, and difficult data collection. Electrical testing usually uses a Wheat bridge to measure the impedance characteristics between network points to detect all continuity. Electrical testing is more accurate in finding short circuits or open circuits. Generally, special equipment is used manually and tested with probes.

At present, electrical testing is mainly used on the market. The electrical testing equipment on the market is low in automation and testing efficiency. During the testing process, it is necessary to manually fix the PCB at the designated position, and manually use probes to position the solder joints. The labor intensity is high and the work It is easy for personnel to miss test points, and sometimes there will be misuse to damage the circuit, and the test efficiency is also very low.

Contents of the invention

Aiming at the deficiencies of the prior art, the present invention provides an automatic detection device for PCB circuit, which can reduce labor intensity, and has high testing efficiency and guaranteed product quality.

To achieve the above object, the present invention provides the following technical solutions:

A kind of PCB board line automatic detection device is characterized in that, comprises:

cabinet mechanism;

The fixture mechanism has a platform assembly and a clamping assembly arranged on the platform assembly and forming a PCB board positioning station with the platform assembly. A first turntable is connected to the bottom of the platform assembly, and is installed on the cabinet mechanism through the first turntable superior;

The multi-axis sliding table mechanism is arranged on the cabinet mechanism and is located around the PCB board positioning station; and

The probe mechanism is arranged on the multi-axis sliding table mechanism, and the multi-axis sliding table mechanism drives the probe mechanism to move relative to the PCB board positioning station, so as to detect each solder spot of the PCB board on the PCB board positioning station.

Preferably, the platform assembly includes a support plate and a support column arranged on the upper surface of the support plate;

Wherein, the support plate is densely covered with first connection holes, and the bottom of the support column has a connection portion, and the connection portion has a second connection hole docked with the first connection holes.

Preferably, there are multiple clamping assemblies distributed on the edge of the support plate, and each clamping assembly includes:

The frame body is installed on the edge of the support plate and can move on the support plate;

The lifting seat is arranged on the frame body and can be raised and lowered on the frame body;

The pressure plate is arranged on the lifting seat and rises and falls synchronously with the lifting seat; and

The lifting driving rod is arranged on the frame body and connected with the lifting seat, so as to drive the lifting seat and the pressing plate to move up and down, and press the PCB board on the support column.

Preferably, the frame body includes a bottom plate installed on the edge of the support plate, a guide post on the bottom plate, and a top plate on the top of the guide post, and the bottom plate has a waist-shaped adjustment hole.

Preferably, the lifting drive rod includes a screw rod installed on the frame body and a nut sleeve sleeved on the screw rod and connected with the lifting base at the same time.

Preferably, the multi-axis slide mechanism is a three-axis slide, and includes X-axis drive, Y-axis drive and Z-axis drive;

Among them, the X-axis drive has two groups and is arranged in parallel, the Y-axis drive has two groups, and the two ends of each group of Y-axis drives are respectively connected to two sets of X-axis drive skateboards, and the Z-axis drive has two groups, which are respectively installed on Two sets of Y-axis driven slides;

The probe mechanism has two groups, and is respectively installed on two groups of slide plates driven by the Z axis.

Preferably, the probe mechanism includes:

The second turntable is connected to the multi-axis sliding mechanism through a connecting plate;

The middle piece is connected to the turntable of the second turntable and rotates with the turntable;

a probe detection component, having a first elastic connection component connected to the middle piece and a detection probe connected to the bottom of the first elastic connection component; and

The coarse positioning component has a second elastic connection component connected to the intermediate piece and a detection rod connected to the second elastic connection component, the lower end of the detection rod is lower than the detection end of the lower end of the detection probe.

Preferably, the first elastic connection assembly includes a first connection sleeve, a first pressure sensor, a first spring and a probe connection seat;

The upper end of the first connecting sleeve is fixed on the middle piece;

The first pressure sensor is located in the first connection sleeve;

The upper end of the probe connecting seat fits in the first connecting sleeve and can move up and down, and the lower end is used for installation of detection probes;

The first spring is arranged in the first connection sleeve, the upper end is supported by the first pressure sensor, and the lower end is supported by the upper end of the probe connecting seat.

Preferably, the coarse positioning assembly has two groups, which are respectively located on both sides of the probe detection assembly, and each group of coarse positioning assembly includes a second connecting sleeve, a second pressure sensor and a second spring;

The upper end of the second connection sleeve is fixed on the middle piece;

The second pressure sensor is located in the second connecting sleeve;

The upper end of the detection rod fits in the second connection sleeve and can move up and down, and the lower end extends to the outside of the second connection sleeve and is located below the detection probe;

The second spring is arranged in the second connecting sleeve, the upper end is supported by the second pressure sensor, and the lower end is supported by the upper end of the detection rod.

Preferably, the probe mechanism further includes a camera assembly, which is connected to the middle piece and corresponds to the detection probe.

The advantages of the present invention are:

1. It can automatically detect PCB boards, reduce labor costs, improve detection efficiency and quality;

2. The fixture mechanism can be fine-tuned to adapt to the positioning of PCB boards of different sizes;

3. In the probe mechanism, the camera assembly is used to identify the solder joints, and the three-axis slide table is used to move the probe mechanism to the designated position for detection. The probe mechanism can rotate and fine-tune the detection probe through the second turntable. A turntable can rotate and adjust the PCB board to detect the positions of solder joints that easily cause interference between the detection probe and other components. At the same time, the probe mechanism realizes the buffer function through the first elastic connection component and the second elastic connection component, effectively The detection probe is protected and its service life is prolonged.

Description of drawings

Fig. 1 is the schematic diagram of the PCB circuit automatic detection device provided by the present embodiment;

FIG. 2 is a schematic diagram of the multi-axis slide mechanism provided in this embodiment;

Fig. 3 is the schematic diagram of the clamp mechanism provided by the present embodiment;

FIG. 4 is a schematic diagram of the clamping assembly provided in this embodiment;

Figure 5 is a schematic diagram of the probe mechanism provided in this embodiment;

Fig. 6 is a cross-sectional view of the first elastic connection component provided by this embodiment;

Fig. 7 is a cross-sectional view of the second elastic connection component provided by this embodiment.

Detailed ways

The automatic detection device for PCB board circuit of the present invention will be further described in conjunction with FIG. 1 to FIG. 7 .

An automatic detection device for PCB board circuit is characterized in that it includes a cabinet mechanism 10, a clamp mechanism 20, a multi-axis slide mechanism 40 and a probe mechanism 50.

The cabinet mechanism 10 includes a profile support, multi-layer laminates built on the profile support to form a cabinet structure, universal wheels arranged at the bottom of the profile support to facilitate the movement of the cabinet mechanism 10, and set on the cabinet structure. door panels.

Described clamping mechanism 20 comprises platform component 22 and is arranged on platform component 22 and forms the clamping component 21 of PCB board positioning station between platform component 22, is connected with the first turntable 23 at the bottom of platform component 22, and clamping mechanism 20 is installed on the top surface of the cabinet mechanism 10 through the first turntable 23.

The multi-axis slide mechanism 40 is arranged on the top surface of the cabinet mechanism 10 through the slide pillar 44 and is located around the PCB board positioning station.

The probe mechanism 50 is arranged on the multi-axis slide mechanism 40, and the probe mechanism 50 is driven by the multi-axis slide mechanism 40 to move relative to the PCB board positioning station, so as to each position of the PCB board 30 on the PCB board positioning station. Solder joint inspection.

Specifically as shown in Figure 3, the platform assembly 22 includes a support plate 222 arranged on the turntable of the first turntable 23 and a support column 221 arranged on the upper surface of the support plate 222, and the number of support columns 221 can be determined according to the number of PCB boards 30. Size and structure are set.

The support plate 222 is densely covered with first connection holes 2221, the lower end of the support column 221 has a connection portion, and the connection portion has a second connection hole. After the first connecting hole 2221 is docked and the bolts are screwed in, the support column 221 can be positioned on different positions of the support plate 222 to adapt to the support and positioning of PCB boards 30 of different sizes and structures.

As shown in FIGS. 3 and 4 , there are multiple clamping assemblies 21 , which are distributed on the edge of the support plate 222 , that is, a clamping assembly 21 is arranged on each of the four sides of the support plate 222 . Each clamping assembly 21 includes a frame body 211 , an elevating base 212 , a pressing plate 213 and an elevating driving rod 214 . The frame body 211 is installed on the edge position of the support plate 222, and can move on the support plate 222; the lifting seat 212 is arranged on the frame body 211 and can lift on the frame body 211; The lifting base 212 lifts synchronously; the lifting drive rod 214 is arranged on the frame body 211 and connected with the lifting base 212 to drive the lifting base 212 and the pressing plate 213 to move up and down, and press the PCB board 30 on the support column 221 . The movement of the clamping assembly 21 on the support plate 222 and the lifting of the pressure plate 213 can adapt to the clamping of PCB boards 30 of different sizes on the PCB board positioning station, which significantly improves the flexibility of the present invention.

The frame body 211 includes a base plate 2111 installed on the edge of the support plate 222, two guide columns 2112 arranged on the base plate 2111, and a top plate 2113 arranged on the top of the two guide columns 2112 at the same time. There is a guide hole cooperating with the guide column 2112 on the side position, and the center of the lift seat 212 has a center hole for the lift drive rod 214 to pass through. There is a waist-shaped adjustment hole 21111 on the bottom plate 2111, the waist-shaped adjustment hole 21111 is docked with the positioning hole on the support plate 222, and then the bolts are inserted and tightened to fix the frame body 211, and after the bolts are loosened, the frame body 211 can be fixed. The frame body 211 slides on the support plate 222 to adjust the distance between the clamping components 21 to clamp PCB boards 30 of different sizes.

The lifting drive rod 214 includes a screw rod 2141 installed on the bottom plate 2111 and the top plate 2113 through upper and lower bearings, and a nut sleeve 2142 sleeved on the screw rod 2141 and connected with the lifting base 212 by bolts. Under this structure, after the screw rod 2141 is rotated, the nut cover 2142 , the lifting seat 212 and the corresponding pressing plate 213 can be driven to move up and down, so as to press the PCB board 30 on the support column 221 .

In order to facilitate the rotation of the screw mandrel 2141, the upper end of the screw mandrel 2141 is connected with a handwheel 215 which is convenient for the operator to hold.

The pressure plate 213 includes a plate body 2131 fixed on the lifting seat 212 by bolts and a pressure block 2132 formed on the front of the plate body 2131. The plate body 2131 is used for the side of the PCB board 30 to lean against, and the PCB board 30 is horizontally limited and pressed. The lower surface of the block 2132 is used to press the upper surface of the edge position of the PCB board 30 , limit the PCB board 30 up and down, and position the PCB board 30 on the support column 221 for circuit detection.

As shown in FIG. 2 , the multi-axis sliding table mechanism 40 is a three-axis sliding table, and includes an X-axis drive 41 , a Y-axis drive 42 and a Z-axis drive 43 . Among them, the X-axis drive 41 has two groups and is built on both sides of the PCB board positioning station through the slide table pillar 44. The Y-axis drive 42 has two groups, and the two ends of each group of Y-axis drives 42 are respectively connected to two groups of X shaft drive 41 on the slide plate, and driven by the X-axis drive 41 to move in the X-axis direction of the PCB board positioning station, the Z-axis drive 43 has two groups, and is respectively installed on two groups of Y-axis drive 42 on the slide plate, It is driven by the Y-axis drive 42 to move in the Y-axis direction; the probe mechanism 50 has two groups, and is installed on the slide plates of the two groups of Z-axis drives 43 respectively, and is driven by the Z-axis drive 43 to move in the Z-axis direction. move.

In this embodiment, the X-axis drive 41 , the Y-axis drive 42 and the Z-axis drive 43 all include a track, a slide plate arranged on the track, and a ball screw set between the track and the slide plate to drive the slide plate to reciprocate.

As shown in FIGS. 5 , 6 and 7 , the probe mechanism 50 includes a second turntable 51 , an intermediate piece 52 , a probe detection component 55 and a rough positioning component 54 .

The second turntable 51 is connected to the multi-axis slide mechanism 40 through a connecting plate 56, that is, connected to the slide plate of the Z-axis drive 43; the middle piece 52 is connected to the turntable of the second turntable 51 to rotate with the turntable; the probe The detection assembly 55 has a first elastic connection assembly 551 connected to the middle piece 52 and a detection probe 552 connected to the bottom of the first elastic connection assembly 551; the coarse positioning assembly 54 is connected to the middle piece 52 and has a The second elastic connection component 541 on the top and the detection rod 542 connected to the second elastic connection component 541 , the lower end of the detection rod 542 is lower than the detection end of the lower end of the detection probe 552 .

The intermediate piece 52 includes a connecting plate 521 connected to the turntable of the second turntable 51 by bolts, and a connecting column 522 inserted in the central hole of the connecting plate 521 and fixed by bolts and extending downward.

The first elastic connection assembly 551 includes a first connection sleeve 5511 , a first pressure sensor 5512 , a first spring 5514 and a probe connection seat 5515 .

The upper end of the first connecting sleeve 5511 is fixed on the flange portion of the lower end of the connecting column 522 through a flange, and the lower end extends downward; the first pressure sensor 5512 is located in the first connecting sleeve 5511; the probe connecting seat The upper end of 5515 fits in the first connecting sleeve 5511, and can move up and down, and the lower end extends to the outside of the first connecting sleeve 5511 for the detection probe 552 to be installed; the first spring 5514 is arranged in the first connecting sleeve 5511, and the upper end The spring guide post 5513 is supported on the first pressure sensor 5512 , and the lower end presses against the upper end of the probe connecting seat 5515 .

There is a first limiting inner step on the inner wall near the lower end of the first connecting sleeve 5511, and there is a first limiting outer step matched with the first limiting inner step on the upper end of the probe connecting seat 5515, so that the probe The upper end of the connection seat 5515 is defined in the first connection sleeve 5511 .

The detection probe 552 is used to detect the quality of the PCB board circuit. When the detection probe 552 touches the solder joint on the PCB, it will move down to ensure normal conduction between it and the solder joint. The first pressure sensor 5512 The pressure is detected by the first spring 5514 to avoid damage to the detection probe 552 . During the detection process, the first spring 5514 can be adaptively compressed, so that the detection probe 552 can be adaptively moved upwards, thereby protecting the detection probe 552 .

The coarse positioning assembly 54 has two groups, which are respectively located on two sides of the probe detection assembly 55 . Each set of coarse positioning components 54 includes a second connecting sleeve 5411, a second pressure sensor 5412 and a second spring 5414; the upper end of the second connecting sleeve 5411 is fixed on the connecting plate 521 through a flange, and the lower end extends downward; The second pressure sensor 5412 is set in the second connection sleeve 5411; the upper end of the detection rod 542 fits in the second connection sleeve 5411 and can move up and down, and the lower end extends to the outside of the second connection sleeve 5411 and is located at the detection Below the probe 552 ; the second spring 5414 is set in the second connecting sleeve 5411 , the upper end is supported on the second pressure sensor 5412 through the spring guide post 5413 , and the lower end is supported on the upper end of the detection rod 542 .

When the Z-axis drive 43 drives the probe mechanism 50 to move down, the lower end of the detection rod 542 first contacts the PCB board 30, and the pressure is transmitted to the second pressure sensor 5412 through the second spring 5414, and the host system of the automatic detection device passes through the second pressure sensor 5412. The linear relationship between the pressure value of the pressure sensor 5412 and the stroke of the detection rod 542 plays a positioning effect on the PCB board 30 to determine the specific position of the PCB board 30, and then slows down the feed speed of the Z-axis drive 43 to reduce the detection speed. The descending speed of the needle detection assembly 55 is to play a protective role.

Similarly, there is a second space-limiting inner step on the inner wall near the lower end of the second connection sleeve 5411, and a second space-limiting outer step matched with the second space-limiting inner step is provided on the upper end of the detection rod 542 to detect The upper end of the rod 542 is defined in the second connection sleeve 5411 .

In order to ensure the stability between the probe detection assembly 55 and the two sets of rough positioning assemblies 54 , a positioning plate 56 is assembled on the lower ends of the first connecting sleeve 5511 and the two second connecting sleeves 5411 .

The probe mechanism 50 also includes a camera assembly 53 connected to the middle piece 52 and corresponding to the detection probe 552 .

Specifically, the camera assembly 53 includes a mounting plate 531 and a camera 532, wherein one side of the mounting plate 531 is formed with a mounting tube, the mounting plate 531 is sleeved on the connecting column 522 through the mounting tube, and then fixed by a top screw; 532 is mounted on the lower surface of the mounting board 531 for photographing and identifying solder joints detected by the detection probe 552 .

The side wall of the mounting sleeve is provided with a threaded hole, and the jacking screw fits in the threaded hole. After the jacking screw is tightened, the camera assembly 53 can be positioned, and after the jacking screw is loosened, the corner of the camera assembly 53 can be fine-tuned.

When using it specifically:

The clamp mechanism 20 is adaptively adjusted according to the actual size of the PCB board 30 to effectively fix the PCB board 30;

The three-axis sliding table drives the probe mechanism to move above the PCB board 30, and the camera assembly 53 captures the corresponding pictures in real time to identify the solder joints. The mechanism 50 moves to the position of the solder spot to be tested;

The probe mechanism 50 moves down, and the height position of the PCB board 30 is determined under the detection of the coarse positioning component 54, so as to slow down the downward movement speed of the probe mechanism and play a protective role;

When the detection probe 552 moves down and touches the solder joint on the PCB, continue to move down to ensure the normal conduction between the detection probe 552 and the solder joint. During this process, the host system passes the first pressure sensor 5512 and The first spring 5514 detects the magnitude of the pressure and controls the downward movement of the probe to avoid damage to the detection probe 552 .

In the above detection process, the PCB board 30 can be automatically detected, reducing labor costs, improving detection efficiency and detection quality; the fixture mechanism 20 can be adaptively adjusted to adapt to the positioning of PCB boards 30 of different sizes; in the probe mechanism 50, Use the camera assembly 53 to identify the solder joints, use the three-axis slide table to move the probe mechanism 50 to a designated position for detection, the probe mechanism 50 can rotate and fine-tune the detection probe 552 through the second turntable 51, and the first turntable 23, the PCB board 30 can be rotated and adjusted to detect the positions of solder joints that easily cause the detection probe 552 to interfere with other components. At the same time, the probe mechanism 50 realizes buffering through the first elastic connection component 551 and the second elastic connection component 541 Function, effectively protect the probe and prolong its service life.

Unless otherwise specified, in the present invention, if there are terms "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", " The orientation or positional relationship indicated by "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial" and "circumferential" are based on the drawings The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, so the orientation or position described in the present invention The terms of positional relationship are used for illustrative purposes only, and should not be construed as limitations on this patent. Those of ordinary skill in the art can understand the specific meanings of the above terms according to specific situations in conjunction with the accompanying drawings.

Unless otherwise clearly specified and limited, in the present invention, if the terms "arrangement", "connection" and "connection" should be interpreted in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection ; It can be directly connected, or indirectly connected through an intermediary, and can be internally connected between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

The above descriptions are only preferred implementations of the present invention, and the scope of protection of the present invention is not limited to the above examples, and all technical solutions that fall under the idea of the present invention belong to the scope of protection of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (10)

1. Automatic detection device of PCB board circuit, its characterized in that includes:

a cabinet mechanism;

the clamp mechanism is provided with a platform assembly and a clamping assembly which is arranged on the platform assembly and forms a PCB positioning station with the platform assembly, the bottom of the platform assembly is connected with a first rotary table, and the clamp mechanism is arranged on the cabinet mechanism through the first rotary table;

the multi-axis sliding table mechanism is arranged on the cabinet body mechanism and is positioned around the PCB positioning station; and

the probe mechanism is arranged on the multi-shaft sliding table mechanism, and the multi-shaft sliding table mechanism drives the probe mechanism to move relative to the PCB positioning station so as to detect each welding spot of the PCB on the PCB positioning station.

2. The automatic detection device for circuit of PCB board according to claim 1, wherein: the platform assembly comprises a supporting plate and a supporting column arranged on the upper surface of the supporting plate;

the support column comprises a support plate, wherein first connecting holes are densely distributed in the support plate, the bottom of the support column is provided with a connecting part, and the connecting part is provided with second connecting holes which are in butt joint with the first connecting holes.

3. The automatic detection device for circuit of PCB board according to claim 2, wherein: the clamping assembly has a plurality ofly to distribute on the border position of backup pad, every clamping assembly all includes:

the frame body is arranged at the edge position of the supporting plate and can move on the supporting plate;

the lifting seat is arranged on the frame body and can lift up and down on the frame body;

the pressing plate is arranged on the lifting seat and synchronously lifts along with the lifting seat; and

the lifting driving rod is arranged on the frame body and connected with the lifting seat so as to drive the lifting seat and the pressing plate to move up and down, and the PCB is pressed on the supporting column.

4. The automatic detection device for circuit of PCB board according to claim 3, wherein: the frame body comprises a bottom plate arranged on the edge of the supporting plate, a guide column arranged on the bottom plate and a top plate arranged at the top of the guide column, wherein the bottom plate is provided with a waist-shaped adjusting hole.

5. The automatic detection device for circuit of PCB of claim 4, wherein: the lifting driving rod comprises a screw rod arranged on the frame body and a nut sleeve sleeved on the screw rod and connected with the lifting seat.

6. The automatic detection device for circuit of PCB board according to claim 1, wherein: the multi-shaft sliding table mechanism is a three-shaft sliding table and comprises X-shaft drive, Y-shaft drive and Z-shaft drive;

the X-axis drives are provided with two groups and are arranged in parallel, the Y-axis drives are provided with two groups, two ends of each group of Y-axis drives are respectively connected to two groups of X-axis driven sliding plates, and the Z-axis drives are provided with two groups and are respectively arranged on the two groups of Y-axis driven sliding plates;

the probe mechanism is provided with two groups and is respectively arranged on two groups of Z-axis driven sliding plates.

7. The automatic detection device for circuit of PCB of claim 1, wherein the probe mechanism comprises:

the second turntable is connected to the multi-shaft sliding mechanism through a connecting plate;

the intermediate piece is connected to the turntable of the second turntable and rotates along with the turntable;

the probe detection assembly is provided with a first elastic connection assembly connected to the middle piece and a detection probe connected to the bottom of the first elastic connection assembly; and

the coarse positioning assembly is provided with a second elastic connecting assembly connected to the middle piece and a detection rod connected to the second elastic connecting assembly, and the lower end of the detection rod is lower than the detection end of the lower end of the detection probe.

8. The automatic detection device for circuit of PCB of claim 7, wherein: the first elastic connecting component comprises a first connecting sleeve, a first pressure sensor, a first spring and a probe connecting seat;

the upper end of the first connecting sleeve is fixed on the middle piece;

the first pressure sensor is positioned in the first connecting sleeve;

the upper end of the probe connecting seat is matched in the first connecting sleeve and can move up and down, and the lower end of the probe connecting seat is used for installing a detection probe;

the first spring is arranged in the first connecting sleeve, the upper end of the first spring is supported on the first pressure sensor, and the lower end of the first spring is supported on the upper end of the probe connecting seat.

9. The automatic detection device for circuit of PCB of claim 8, wherein: the coarse positioning assembly is provided with two groups which are respectively positioned at two sides of the probe detection assembly, and each group of coarse positioning assembly comprises a second connecting sleeve, a second pressure sensor and a second spring;

the upper end of the second connecting sleeve is fixed on the middle piece;

the second pressure sensor is positioned in the second connecting sleeve;

the upper end of the detection rod is matched in the second connecting sleeve and can move up and down, and the lower end of the detection rod extends to the outside of the second connecting sleeve and is positioned below the detection probe;

the second spring is arranged in the second connecting sleeve, the upper end of the second spring is supported on the second pressure sensor, and the lower end of the second spring is supported on the upper end of the detection rod.

10. The automatic detection device for circuit of PCB of claim 7, wherein: the probe mechanism further comprises a camera assembly, and the camera assembly is connected to the middleware and corresponds to the detection probe.

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