阅读说明：本技术 一种手机pcb板的测试装置及测试方法 (Testing device and testing method for mobile phone PCB ) 是由 王辉 杨鹏 于 2021-07-06 设计创作，主要内容包括：本发明涉及电路的测试领域,具体是涉及一种手机PCB板的测试装置。测试装置包括机架、治具、工业机器人；以及安装架,其设置在工业机器人的输出端；电机,其安装在安装架上；偏心轴,其一端同轴安装在电机的输出轴；第一摇臂,其一端通过转动副安装在安装架上,第一摇臂的中间部位设置有滑槽,滑槽的长度方向平行于第一摇臂的长度方向,偏心轴的另一端插设在滑槽内部并且与滑槽滑动配合；探针模块,其设置在第一摇臂的自由端；控制器,控制器用于采集探针模块的测试数据。本申请通过急回机构降低了探针模块靠近PCB板的速度,并且通过弹性材料制作第一摇臂的下半部分,实现了探针模块的慢速软着陆,并且不降低探针模块的工作频率。(The invention relates to the field of circuit testing, in particular to a testing device for a mobile phone PCB. The testing device comprises a frame, a jig and an industrial robot; and a mounting frame provided at an output end of the industrial robot; a motor mounted on the mounting bracket; one end of the eccentric shaft is coaxially arranged on an output shaft of the motor; one end of the first rocker arm is mounted on the mounting frame through a revolute pair, a sliding groove is formed in the middle of the first rocker arm, the length direction of the sliding groove is parallel to the length direction of the first rocker arm, and the other end of the eccentric shaft is inserted into the sliding groove and is in sliding fit with the sliding groove; a probe module disposed at a free end of the first rocker arm; and the controller is used for acquiring the test data of the probe module. This application has reduced the speed that the probe module is close to the PCB board through quick return mechanism to the latter half through the first rocking arm of elastic material preparation has realized the soft landing of probe module at a slow speed, and does not reduce the operating frequency of probe module.)

1. A testing device for PCB board of mobile phone comprises,

a frame;

the jig (1) is arranged on the rack, and the jig (1) is used for positioning the PCB;

an industrial robot (2) arranged on the frame;

the flying probe testing shaft (3) is arranged at the output end of the industrial robot (2), and the flying probe testing shaft (3) is used for carrying out circuit testing on the PCB;

it is characterized in that the flying probe testing shaft (3) comprises,

a mounting frame (3a) arranged at the output end of the industrial robot (2);

a motor (3b) mounted on the mounting bracket (3 a);

an eccentric shaft (3c) having one end coaxially mounted on the output shaft of the motor (3 b);

one end of the first rocker arm (3d) is mounted on the mounting frame (3a) through a revolute pair, a sliding groove is formed in the middle of the first rocker arm (3d), the length direction of the sliding groove is parallel to the length direction of the first rocker arm (3d), and the other end of the eccentric shaft (3c) is inserted into the sliding groove and is in sliding fit with the sliding groove;

a probe module (3e) provided at a free end of the first swing arm (3 d);

a controller for acquiring test data of the probe module (3 e).

2. The testing device for the PCB of the mobile phone according to claim 1, wherein the first rocker arm (3d) is positioned at the two sides of the chute, the part close to the PCB is made of elastic material, and the part far away from the PCB is made of rigid material.

3. The device for testing the PCB of the mobile phone as claimed in claim 2, wherein the sliding slot is arc-shaped and protrudes in a direction away from the PCB.

4. The testing device for the PCB of the mobile phone as claimed in claim 2, wherein the first rocker arm (3d) is provided with a slot (3d1), the inside of the slot (3d1) is detachably provided with a plate spring (3d6), the length directions of the slot (3d1) and the plate spring (3d6) are both parallel to the length direction of the first rocker arm (3d), and a gap between the top wall of the plate spring (3d6) and the inner wall of the slot (3d1) forms a sliding slot.

5. The testing device of the mobile phone PCB as claimed in claim 4, wherein the plate spring (3d6) is provided with a strain sensor (3d7), and the controller is used for collecting the signal of the strain sensor (3d 7).

6. The testing device for the PCB of the mobile phone according to claim 5, further comprising a pressure sensor (4), wherein the pressure sensor (4) is arranged on the rack, and the controller is used for collecting signals of the pressure sensor (4).

7. The testing device for the PCB of the mobile phone as claimed in claim 1, wherein the eccentric shaft (3c) comprises a driving post (3c1), a disc-shaped member (3c2) and a driving post (3c3) which are connected in sequence, the output shaft of the motor (3b) is coaxially connected with the driving post (3c1), the driving post (3c1) is coaxially connected with the disc-shaped member (3c2), the driving post (3c3) is eccentrically connected with the disc-shaped member (3c2), the axis of the driving post (3c3) is parallel to the axis of the disc-shaped member (3c2), and a bump (3c4) is arranged at one end of the disc-shaped member (3c2) far away from the driving post (3c 3).

8. The testing device of the mobile phone PCB board of claim 7, wherein the flying probe testing shaft (3) further comprises a sensor (3f), the sensor (3f) is arranged on the mounting rack (3a), the sensor (3f) is used for sensing the position of the bump (3c4), and the controller is used for collecting the signal transmitted by the sensor (3f) and the rotor angular position of the motor (3 b).

9. The testing device of the PCB of the mobile phone according to any one of the claims 1 to 8, wherein the flying probe testing shaft (3) further comprises,

one end of the second rocker arm (3g) is arranged on the mounting frame (3a) through a revolute pair, and the second rocker arm (3g) is parallel to the first rocker arm (3 d);

and two ends of the connecting rod (3h) are respectively hinged with the free end of the first rocker arm (3d) and the free end of the second rocker arm (3g), and the probe module (3e) is arranged on the connecting rod (3 h).

10. A test method of a test device of a mobile phone PCB is characterized in that the test device comprises a frame; the jig (1) is arranged on the rack, and the jig (1) is used for positioning the PCB; an industrial robot (2) arranged on the frame; a mounting frame (3a) arranged at the output end of the industrial robot (2); a motor (3b) mounted on the mounting bracket (3 a); an eccentric shaft (3c) having one end coaxially mounted on the output shaft of the motor (3 b); one end of a first rocker arm (3d) is mounted on the mounting frame (3a) through a revolute pair, a sliding groove is formed in the middle of the first rocker arm (3d), the length direction of the sliding groove is parallel to the length direction of the first rocker arm (3d), the other end of an eccentric shaft (3c) is inserted into the sliding groove and is in sliding fit with the sliding groove, the first rocker arm (3d) is located at the positions of two sides of the sliding groove, the position close to the PCB is made of elastic materials, the position far away from the PCB is made of rigid materials, and a strain sensor (3d7) is mounted on the elastic position of the first rocker arm (3 d); a probe module (3e) provided at a free end of the first swing arm (3 d); the pressure sensor (4) is arranged on the rack, and a welding spot is arranged at the sensing end of the pressure sensor (4); the controller is used for acquiring the test data of the probe module (3e) and the signals of the strain sensor (3d7) and the pressure sensor (4); the testing method comprises the following steps of,

s1, the motor (3b) drives the first rocker arm (3d) to rotate downwards so that the detection end of the probe module (3e) is located at the lowest point;

s2, the industrial robot (2) drives the detection end of the probe module (3e) to contact with the sensing end of the pressure sensor (4);

s3, the industrial robot (2) drives the detection end of the probe module (3e) to step downwards, the controller counts the pressure fed back by the pressure sensor (4) and the resistance fed back by the strain sensor (3d7), and a lookup table is established;

s4, the industrial robot (2) drives the detection end of the probe module (3e) to move to a PCB, the motor (3b) drives the eccentric shaft (3c) to rotate so as to drive the first rocker arm (3d) to swing, so that welding spots on the PCB are detected, and the controller reversely calculates the contact force between the detection end of the probe module (3e) and the PCB through table lookup according to the resistance fed back by the strain sensor (3d 7);

s5a, if the contact force is within the preset threshold range, continuing to detect;

and S5b, stopping if the contact force exceeds a preset threshold range.

Technical Field

The invention relates to the field of circuit testing, in particular to a testing device for a mobile phone PCB. The invention also relates to a testing method of the testing device of the mobile phone PCB.

Background

At present, there are two main methods for electrical testing of PCBs: one is needle bed in-line testing (ICT) and the other is flying needle testing. Although the testing efficiency of the flying probe testing system is slightly inferior to that of an ICT test, the flying probe testing system has the advantages of rapidity, economy, flexibility and the like compared with an on-line testing of a needle bed.

The coverage rate of a needle bed test can only reach 60% -70% for some high-density PCB boards due to the constraint of the spacing of welding spots, and a flying probe test system tests by using a probe capable of moving randomly according to the network logic relationship of the PCB boards, wherein the probe has a certain angle, the test coverage rate can reach more than 90%, and the flexibility is high.

Since the advent of the flying probe test technology, the flying probe test technology is continuously developing and changing, continuously improving the defects of the flying probe test technology, greatly improving the test efficiency, the test precision, the test function diversity and the like, and one of the main development directions is probe soft landing.

Because the test probe makes physical contact with the via and the solder on the test pad, a small dimple may be left on the solder joint. For some customers, these small pits may be considered cosmetic defects, resulting in a denial of acceptance. However, some manufacturers of flying probe testing equipment have developed new techniques, and the use of "soft landing" can avoid leaving obvious pits on the solder, and can even perform testing on ceramic chips. The control system of the test probe adopts a soft landing mode, namely, the test probe is instantaneously decelerated before contacting with the test point, so that the impact is reduced to the minimum, for example:

a probe disclosed in patent No. CN 201780002575.9;

a probe and a connector suitable for high-current high-speed signal test are disclosed in patent No. CN 202020836475.5;

the probe disclosed in patent No. cn201580026205.x and an electronic device using the probe;

the improvement directions of the above patents are to improve the probe of the flying probe device into a split probe connected by an elastic member, or the middle part of the probe has elasticity, or the probe is mounted on the elastic member, which are improvements on the probe, so that the unit price of the probe becomes higher and higher. And the probe is a lossy member, this makes the design of soft landing by modifying the probe greatly increase the production cost.

Disclosure of Invention

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the application provides a testing device of a mobile phone PCB, which comprises a frame; the jig is arranged on the rack and used for positioning the PCB; an industrial robot disposed on the frame; the flying probe testing shaft is arranged at the output end of the industrial robot and is used for carrying out circuit testing on the PCB; the flying probe testing shaft comprises a mounting rack which is arranged at the output end of the industrial robot; a motor mounted on the mounting bracket; one end of the eccentric shaft is coaxially arranged on an output shaft of the motor; one end of the first rocker arm is mounted on the mounting frame through a revolute pair, a sliding groove is formed in the middle of the first rocker arm, the length direction of the sliding groove is parallel to the length direction of the first rocker arm, and the other end of the eccentric shaft is inserted into the sliding groove and is in sliding fit with the sliding groove; a probe module disposed at a free end of the first rocker arm; and the controller is used for acquiring the test data of the probe module.

Preferably, the first rocker arm is located at two sides of the sliding groove, wherein the part close to the PCB is made of an elastic material, and the part far away from the PCB is made of a rigid material.

Preferably, the sliding groove is arc-shaped and protrudes towards the direction far away from the PCB.

Preferably, the first rocker arm is provided with a slot, the slotted inner part is detachably provided with a plate spring, the length directions of the slot and the plate spring are both parallel to the length direction of the first rocker arm, and a gap between the top wall of the plate spring and the inner wall of the slot forms a sliding groove.

Preferably, the leaf spring is provided with a strain sensor, and the controller is used for acquiring signals of the strain sensor.

Preferably, the testing device further comprises a pressure sensor, the pressure sensor is arranged on the rack, and the controller is used for collecting signals of the pressure sensor.

Preferably, the eccentric shaft comprises a transmission column, a disc-shaped part and a driving column which are sequentially connected, an output shaft of the motor is coaxially connected with the transmission column, the transmission column is coaxially connected with the disc-shaped part, the driving column is eccentrically connected with the disc-shaped part, the axis of the driving column is parallel to the axis of the disc-shaped part, and a convex block is arranged at one end, far away from the driving column, of the disc-shaped part.

Preferably, the flying probe test shaft further comprises a sensor arranged on the mounting frame, the sensor is used for sensing the position of the bump, and the controller is used for collecting signals transmitted by the sensor and the angular position of the rotor of the motor.

Preferably, the flying probe test shaft further comprises,

one end of the second rocker arm is mounted on the mounting frame through a revolute pair, and the second rocker arm is parallel to the first rocker arm;

and two ends of the connecting rod are respectively hinged with the free end of the first rocker arm and the free end of the second rocker arm, and the probe module is installed on the connecting rod.

The application also provides a testing method of the testing device of the mobile phone PCB, and the testing device comprises a frame; the jig is arranged on the rack and used for positioning the PCB; an industrial robot disposed on the frame; the mounting rack is arranged at the output end of the industrial robot; a motor mounted on the mounting bracket; one end of the eccentric shaft is coaxially arranged on an output shaft of the motor; one end of the first rocker arm is mounted on the mounting frame through a revolute pair, a sliding groove is formed in the middle of the first rocker arm, the length direction of the sliding groove is parallel to the length direction of the first rocker arm, the other end of the eccentric shaft is inserted into the sliding groove and is in sliding fit with the sliding groove, the first rocker arm is located on the two sides of the sliding groove, the position close to the PCB is made of elastic materials, the position far away from the PCB is made of rigid materials, and a strain sensor is mounted on the elastic position of the first rocker arm; a probe module disposed at a free end of the first rocker arm; the pressure sensor is arranged on the rack, and a welding spot is arranged at the sensing end of the pressure sensor; the controller is used for acquiring the test data of the probe module and signals of the strain sensor and the pressure sensor; the testing method comprises the following steps of S1, driving the first rocker arm to rotate downwards by the motor so that the detection end of the probe module is located at the lowest point; s2, the industrial robot drives the detection end of the probe module to contact with the sensing end of the pressure sensor; s3, the industrial robot drives the detection end of the probe module to step downwards, the controller counts the pressure fed back by the pressure sensor and the resistance fed back by the strain sensor, and a lookup table is established; s4, the industrial robot drives the detection end of the probe module to move to the PCB, the motor drives the eccentric shaft to rotate so as to drive the first rocker arm to swing, and therefore welding spots on the PCB are detected, and the contact force between the detection end of the probe module and the PCB is reversely solved by the controller through table lookup according to the resistance fed back by the strain sensor; s5a, if the contact force is within the preset threshold range, continuing to detect; and S5b, stopping if the contact force exceeds a preset threshold range.

The quick return mechanism formed by the motor, the eccentric shaft and the first rocker arm reduces the speed of the probe module approaching the PCB, and does not reduce the speed of the probe module away from the PCB; the upper half part and the lower half part of the first rocker arm are respectively made of rigid materials and elastic materials, so that the probe module can be in elastic contact with a PCB (printed circuit board); therefore, the slow soft landing of the probe module is realized, and the working frequency of the probe module is not reduced.

Drawings

FIG. 1 is a perspective view of a test device embodying the present invention;

fig. 2 is an exploded perspective view of a jig and an indexing device embodying the present invention;

FIG. 3 is a perspective view of a flying probe test shaft embodying the present invention;

FIG. 4 is a first perspective view of a first rocker arm embodying the present invention;

FIG. 5 is a second perspective view of a first rocker arm embodying the present invention;

FIG. 6 is an exploded perspective view of a first rocker arm embodying the present invention;

FIG. 7 is an enlarged view of a portion of FIG. 6 at A;

FIG. 8 is a first perspective view of another flying probe test shaft embodying the present invention;

FIG. 9 is a perspective view of a portion of another flying probe test shaft embodying the present invention;

FIG. 10 is a front view of another flying probe test shaft embodying the present invention;

FIG. 11 is a perspective half sectional view at section B-B of FIG. 10;

FIG. 12 is a second perspective view of another flying probe test shaft embodying the present invention;

FIG. 13 is a flow chart of a test method embodying the present invention;

the reference numbers in the figures are:

1-a jig; 1 a-a bottom plate; 1 b-a locating post; 1 c-a screw;

2-an industrial robot;

3-flying probe test shaft; 3 a-a mounting frame; 3 b-a motor; 3 c-an eccentric shaft; 3c1 — drive column; 3c 2-disc; 3c3 — drive column; 3c 4-bumps; 3c 5-bolt; 3 d-a first rocker arm; 3d 1-grooving; 3d 2-leaf spring seat; 3d 3-leaf spring slot; 3d 4-retaining member slot; 3d 5-anti-slip; 3d 6-leaf spring; 3d 7-strain sensor; 3 e-a probe module; 3 f-sensor; 3 g-a second rocker arm; 3 h-connecting rod; 3 i-visual inspection system;

4-a pressure sensor;

5-a transposition device; 5 a-an index plate; 5 b-rotating disk.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.

The first embodiment is as follows:

because the probe is a worn part, the unit price of the probe is higher and higher by improving the probe, and the use cost of the device is higher and higher, for this reason, how to realize the soft landing of the probe without improving the probe is an urgent problem to be solved, one of the solutions of the problem is to reduce the contact speed of the probe and the PCB, but reducing the moving speed of the probe will cause the working frequency of the probe to be reduced, and further the testing efficiency is affected.

In order to solve this technical problem, as shown in fig. 1 to 3, there are provided:

a testing device for PCB board of mobile phone comprises,

a frame;

the jig 1 is arranged on the rack, and the jig 1 is used for positioning the PCB;

an industrial robot 2 provided on the frame;

the flying probe testing shaft 3 is arranged at the output end of the industrial robot 2, and the flying probe testing shaft 3 is used for carrying out circuit testing on the PCB;

the flying probe test shaft 3 includes,

a mounting frame 3a provided at an output end of the industrial robot 2;

a motor 3b mounted on the mounting frame 3 a;

an eccentric shaft 3c having one end coaxially mounted on an output shaft of the motor 3 b;

one end of the first rocker arm 3d is mounted on the mounting frame 3a through a revolute pair, a sliding groove is formed in the middle of the first rocker arm 3d, the length direction of the sliding groove is parallel to the length direction of the first rocker arm 3d, and the other end of the eccentric shaft 3c is inserted into the sliding groove and is in sliding fit with the sliding groove;

a probe module 3e provided at a free end of the first swing arm 3 d;

and the controller is used for acquiring the test data of the probe module 3 e.

Specifically, as shown in fig. 5, the motor 3b, the eccentric shaft 3c and the first rocker arm 3d form a quick return mechanism, and when the motor 3b drives the eccentric shaft 3c to rotate around the axis thereof, the eccentric end of the eccentric shaft 3c makes a circular motion inside the chute, so that the first rocker arm 3d has a quick return characteristic.

The quick return property is as follows: in the four-bar mechanism, when the crank rotates at a constant speed as a driving part, the reciprocating swing stroke and the reciprocating speed of a rocker of a driven part are different, and the return stroke is faster than the forward stroke.

The snap-back characteristic of the first rocker arm 3d is such that: the probe module 3e is close to the PCB and has a slow contact speed with the PCB, and the probe module 3e has a fast contact speed with the PCB, so that the problem of reducing the contact speed of the probe module 3e with the PCB is solved, and the working frequency of the probe module 3e is not reduced greatly.

As shown in fig. 1 and 2, the testing device further includes an indexing device 5, the indexing device 5 includes an index plate 5a and a rotary plate 5b, the index plate 5a is disposed on the rack, the rotary plate 5b is disposed at an output end of the index plate 5a, and a total of two jigs 1 are detachably mounted on two sides of the rotary plate 5b, so that when the testing device tests one PCB, a worker can disassemble and assemble another jig 1 on the rotary plate 5 b.

Tool 1 includes bottom plate 1a and a plurality of reference column 1b of vertical setting on bottom plate 1a, is provided with the screw hole on the reference column 1b, and every mounting hole one-to-one on reference column 1b and the PCB circuit board, work can be fixed the PCB circuit board on reference column 1b through screw 1 c.

Further, although the above technical solution solves the problem of how to make the probe module 3e soft land, it has a negative effect on the operating frequency of the probe module 3e to some extent. In order to solve the technical problem, the following preferred technical scheme is provided:

the first rocker arm 3d is located at the positions of two sides of the sliding groove, wherein the position close to the PCB is made of elastic materials, and the position far away from the PCB is made of rigid materials.

Specifically, when the eccentric shaft 3c drives the first rocker arm 3d to be close to the PCB, the eccentric shaft 3c is in elastic contact with the first rocker arm 3d, and when the eccentric shaft 3c drives the first rocker arm 3d to be far away from the PCB, the eccentric shaft 3c is in rigid contact with the first rocker arm 3d, so that the driving rotating speed of the motor 3b can be further accelerated, the working frequency of the probe module 3e is improved, soft landing is realized between the probe module 3e and the PCB through elastic materials, and the snap-back characteristic is realized through rigid materials when the probe module 3e resets.

Further, in order to enhance the elasticity of the first rocker arm 3d, as shown in fig. 4 and 5, the following preferred technical solutions are provided:

the spout is the arc, and the spout is towards keeping away from the direction protrusion of PCB board.

Specifically, the elastic portion of the first rocker arm 3d is arc-shaped and protrudes toward the eccentric shaft 3c, thereby enhancing its elasticity.

Further, since the elasticity of the elastic material has a life, the elasticity of the elastic material gradually decreases with repeated elastic deformation of the elastic material, for this reason, the first rocker arm 3d must be replaced before the elastic portion of the first rocker arm 3d fails, however, it takes time and labor to replace the entire first rocker arm 3d, the cost is high, and the machine needs to be reset after the replacement is completed, so as to calibrate the contact position of the probe module 3e and the PCB, as shown in fig. 4 to 7, in order to solve this technical problem, a preferred structure of the first rocker arm 3d is provided:

the first rocker arm 3d is provided with a slot 3d1, a leaf spring 3d6 is detachably mounted in the slot 3d1, the length directions of the slot 3d1 and the leaf spring 3d6 are both parallel to the length direction of the first rocker arm 3d, and a gap between the top wall of the leaf spring 3d6 and the inner wall of the slot 3d1 forms a sliding groove.

Two plate spring seats 3d2 are arranged inside the slot 3d1, a plate spring slot 3d3 which can insert the plate spring 3d6 from one side of the first rocker arm 3d is arranged on the plate spring seat 3d2, two ends of the plate spring 3d6 are respectively connected with the two plate spring seats 3d2 through the plate spring slot 3d3, each plate spring seat 3d2 is provided with an anti-drop piece slot 3d4 which is parallel to the length direction of the plate spring 3d6, an anti-drop piece 3d5 is inserted inside the anti-drop piece slot 3d4, the anti-drop piece 3d5 is used for limiting the plate spring 3d6, the plate spring 3d6 is prevented from dropping from the plate spring slot 3d3 in the reciprocating swing process of the first rocker arm 3d, a handle which is exposed outside the anti-drop piece slot 3d4 is arranged on the anti-drop piece 3d5, so that a worker can insert or pull out the anti-drop piece 3d5 conveniently, and further facilitate the replacement of the plate spring 3d 6.

Further, in order to replace the plate spring 3d6 before it fails, it is necessary to know when the elasticity of the plate spring 3d6 fails, and in order to solve this technical problem, as shown in fig. 5, the following preferred technical solutions are provided:

the leaf spring 3d6 is provided with a strain sensor 3d7, and the controller is used for collecting signals of the strain sensor 3d 7.

Specifically, the strain sensor 3d7 is mounted on the bottom wall of the plate spring 3d6, and the strain sensor 3d7 is 120-2AA, which is known as chengtec. During installation, a proper strain gauge sensor is selected, rust removal, paint removal, degreasing and cleaning are performed on the installation position of the first rocker arm 3d, and then the strain sensor 3d7 is installed on the first rocker arm 3d by using an adhesive.

The working principle of the strain sensor 3d7 is: the resistance value of the wire is related to the length and the cross-sectional area of the wire in addition to the properties of the material, and the wire is attached to the first rocker arm 3d, and when the first rocker arm 3d is deformed by a force, the length and the cross-sectional area of the wire are changed together with the first rocker arm 3d, and thus the resistance is changed. When the elasticity of the elastic portion of the first rocker arm 3d is weakened, the resistance change of the strain sensor 3d7 is also reduced.

The controller judges whether the plate spring 3d6 reaches the service life or not by collecting the resistance change of the strain sensor 3d7, and the controller sends a command of replacing the plate spring 3d6 to an operator according to the judgment result.

Further, when the detecting end of the probe module 3e contacts with the solder joint on the PCB, the contact force between the probe module 3e and the PCB is determined by the resilience of the plate spring 3d6, that is, the strain sensor 3d7 can measure the deformation degree of the plate spring 3d6 to determine the contact force between the probe module 3e and the PCB. In order to make the contact force between the probe module 3e and the PCB in a controllable state, it is necessary to know the relationship between the resistance change of the strain sensor 3d7 and the contact force between the probe module 3e and the PCB, and in order to solve this technical problem, as shown in fig. 1, the following preferred technical solutions are provided:

the testing device further comprises a pressure sensor 4, the pressure sensor 4 is arranged on the rack, and the controller is used for collecting signals of the pressure sensor 4.

Specifically, the pressure sensor 4 is arranged on the rotary disc 5b, and the height of the sensing end of the pressure sensor 4 is the same as that of a welding spot on the PCB. As shown in fig. 12, flying probe test shaft 3 still includes the visual detection system 3i of installing on mounting bracket 3a, and visual detection system 3i mainly includes CCD camera, light filling lamp and computer, and visual detection system 3i presses the induction end at pressure sensor 4 through the sense end of machine vision guide probe module 3e accurately, and pressure sensor 4 feeds back the contact force of probe module 3e to the controller, and the resistance change of strain sensor 3d7 this moment is noted to the controller. The probe module 3e is driven to approach or separate from the pressure sensor 4 by the industrial robot 2 so that the contact force fed back by the pressure sensor 4 is constantly changed while the resistance value of the strain sensor 3d7 is counted. Then, the contact force between the probe module 3e and the PCB can be found out by looking up the table according to the resistance of the strain sensor 3d 7.

Further, since the eccentric shaft 3c is eccentric, it may generate vibration when rotating at a high speed, which may not only damage the motor 3b, but also adversely affect the detection accuracy of the probe module 3e, and in order to solve this technical problem, as shown in fig. 11, the following preferred technical solutions are provided:

the eccentric shaft 3c comprises a transmission column 3c1, a disc-shaped part 3c2 and a driving column 3c3 which are connected in sequence, an output shaft of the motor 3b is coaxially connected with the transmission column 3c1, the transmission column 3c1 is coaxially connected with the disc-shaped part 3c2, the driving column 3c3 is eccentrically connected with the disc-shaped part 3c2, the axis of the driving column 3c3 is parallel to the axis of the disc-shaped part 3c2, and a lug 3c4 is arranged at one end, away from the driving column 3c3, of the disc-shaped part 3c 2.

Specifically, the transmission column 3c1, the disc 3c2 and the driving column 3c3 form an eccentric shaft, a threaded hole is formed in the driving column 3c3, the rod part of the bolt 3c5 is mounted on the driving column 3c3, and the first rocker arm 3d is clamped between the disc 3c2 and the head part of the bolt 3c 5. The tab 3c4 serves to counterbalance the weight of the drive post 3c3 and the load exerted by the first swing arm 3d on the drive post 3c3 so that dynamic balancing can be achieved when the disc 3c2 is rotated at high speed.

The cam 3c4 is preferably detachable, and the worker can increase or decrease the weight of the cam 3c4 in an adaptive manner according to the dynamic balance of the eccentric shaft 3 c. The disk-shaped member 3c2 and the cam 3c4 may be a single member, and the worker designs the excessively heavy cam 3c4 and then adaptively grinds the cam 3c4 according to the dynamic balance of the eccentric shaft 3c to reduce the weight thereof.

Because the transmission post 3c1 is in transmission connection with the output shaft of the motor 3b through the coupler, if the coupler slips, the eccentric end of the eccentric shaft 3c is not in the correct position, and the first rocker arm 3d cannot work normally, in order to find out in time whether the problem of slipping occurs between the transmission post 3c1 and the output shaft of the motor 3b, as shown in fig. 3, the following preferred technical scheme is provided:

the flying probe test shaft 3 further comprises a sensor 3f, the sensor 3f is arranged on the mounting frame 3a, the sensor 3f is used for sensing the position of the bump 3c4, and the controller is used for acquiring signals transmitted by the sensor 3f and the rotor angular position of the motor 3 b.

Specifically, the sensor 3f is a photoelectric switch, when the bump 3c4 is located at the highest point, the bump just shields the sensing end of the sensor 3f, the sensor 3f sends a signal to the controller, the controller collects the rotor angular position of the motor 3b once when receiving the signal sent by the sensor 3f each time, then the controller compares the rotor angular position of the motor 3b collected each time, and if the rotor angular position of the motor 3b changes, it indicates that the output shaft of the motor 3b slips from the eccentric shaft 3 c.

Example two:

since the movement locus of the free end of the first swing arm 3d is an arc, the angle of the detection end of the probe module 3e is difficult to calculate when the detection end of the probe module 3e contacts with the PCB, and in order to solve the technical problem, as shown in fig. 8 and 9, the following preferred technical solutions are provided:

the flying probe test shaft 3 further includes,

one end of the second rocker arm 3g is arranged on the mounting frame 3a through a revolute pair, and the second rocker arm 3g is parallel to the first rocker arm 3 d;

and two ends of the connecting rod 3h are respectively hinged with the free end of the first rocker arm 3d and the free end of the second rocker arm 3g, and the probe module 3e is arranged on the connecting rod 3 h.

Specifically, mounting bracket 3a, first rocking arm 3d, second rocking arm 3g and connecting rod 3h have constituted parallelogram link mechanism, and second rocking arm 3g rotates and keeps parallel with first rocking arm 3d synchronous all the time to make probe module 3 e's sense terminal move towards a fixed unchangeable direction all the time.

The quick return mechanism formed by the motor 3b, the eccentric shaft 3c and the first rocker arm 3d reduces the speed of the probe module 3e approaching the PCB, and does not reduce the speed of the probe module 3e leaving the PCB; in addition, the upper half part and the lower half part of the first rocker arm 3d are respectively made of rigid materials and elastic materials, so that the probe module 3e can be in elastic contact with a PCB (printed circuit board); thereby, a slow soft landing of the probe module 3e is achieved without reducing the operating frequency of the probe module 3 e.

In order to solve the technical problem of how to make the probe module 3e soft-landable on the PCB circuit board and the contact force between the probe module 3e and the PCB circuit board is controllable, as shown in fig. 13, there are provided:

a test method of a test device of a mobile phone PCB comprises the following steps,

s1, the motor 3b drives the first swing arm 3d to rotate downwards so that the detection end of the probe module 3e is located at the lowest point;

s2, the industrial robot 2 drives the detection end of the probe module 3e to contact with the sensing end of the pressure sensor 4;

s3, the industrial robot 2 drives the detection end of the probe module 3e to step downwards, the controller counts the pressure fed back by the pressure sensor 4 and the resistance fed back by the strain sensor 3d7, and a lookup table is established;

s4, the industrial robot 2 drives the detection end of the probe module 3e to move to a PCB, the motor 3b drives the eccentric shaft 3c to rotate so as to drive the first rocker arm 3d to swing, and therefore welding spots on the PCB are detected, and the contact force between the detection end of the probe module 3e and the PCB is reversely solved by the controller through table lookup according to resistance fed back by the strain sensor 3d 7;

s5a, if the contact force is within the preset threshold range, continuing to detect;

and S5b, stopping if the contact force exceeds a preset threshold range.

Specifically, a preset threshold range is input into the controller by the operator, and the operator should replace the plate spring 3d6 immediately after the test equipment is shut down due to the contact force exceeding the preset threshold range.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.