Protection device for measuring system of flying probe machine

Abstract

The utility model relates to a protection device for a flying probe machine measuring system, which belongs to the technical field of circuit board detection equipment, the protection device comprises a magnetic shaft and a magnetic sleeve sleeved on the magnetic shaft, the system comprises a rack, a cantilever mechanism on the rack and a probe assembly on the cantilever mechanism, the upper end and the lower end of the magnetic shaft are fixedly arranged on the rack, and the magnetic shaft is fixedly arranged on the rack. A traction assembly is fixedly arranged between the cantilever mechanism and the magnetic sleeve. Magnetic suspension force is provided for the magnetic sleeve through the magnetic shaft, the magnetic sleeve cooperates with the constant force frame to pull the cantilever mechanism upwards, gravity loads of the cantilever mechanism and the probe assembly can be counteracted or compensated, additional power allowance does not need to be added to increase model selection of a motor, no mechanical friction load exists when the magnetic sleeve compensates and counteracts the gravity loads, and the magnetic sleeve is simple in structure and convenient to operate. The load requirement during system model selection is reduced, the structure cost is saved, the probe control precision is finally improved, and the probe is prevented from damaging a to-be-detected workpiece.

Description

Technical Field

[0001] This utility model belongs to the technical field of circuit board testing equipment, specifically relating to a protection device for a flying probe measuring system. Background Technology

[0002] Current horizontal flying probe measurement systems achieve contact testing of circuit boards through a composite drive of X-axis linear motion, R-axis rotational motion, and Z-axis linear motion. The Z-axis uses a direct drive to meet high-precision displacement control requirements, but this configuration has the following problems: First, the Z-axis must overcome the gravity of the cantilever, probe assembly, and related motion connection guide mechanisms, forcing the selection of a motor with increased thrust margin, leading to increased equipment costs. Second, the direct drive system cannot self-lock after power failure, and the probe assembly is prone to falling and impacting under gravity, posing a risk of damage to the probe and circuit board, increasing maintenance costs and resulting in economic losses.

[0003] Traditional solutions use mechanical springs (including gas / hydraulic springs) for gravity compensation, but these solutions still have certain limitations. On the one hand, the spring system generates contact friction resistance during high-frequency reciprocating motion, leading to power loss and mechanical wear. Frequent motion also accelerates material fatigue and shortens maintenance cycles. On the other hand, the elastic characteristics of the springs cause significant differences in driving force during the lifting stroke, which not only exacerbates thrust fluctuations but also reduces positioning accuracy, prolongs the system's settling time, and limits dynamic response speed. Utility Model Content

[0004] The purpose of this invention is to provide a protective device for a flying needle measuring system in order to solve the above-mentioned problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A protective device for a flying probe measuring system is disclosed. The system includes a frame, a cantilever mechanism vertically slidably mounted on the frame, and a probe assembly located at the head end of the cantilever mechanism. The protective device includes a magnetic shaft and a magnetic sleeve fitted onto the magnetic shaft. Both ends of the magnetic shaft are fixedly mounted on the frame. A traction component is fixed between the cantilever mechanism and the magnetic sleeve. The magnetic shaft provides magnetic levitation force to the magnetic sleeve to counteract or compensate for the gravitational load on the cantilever mechanism and the probe assembly. This protective device counteracts or compensates for the gravitational load on the cantilever mechanism and the probe assembly through the magnetic sleeve in conjunction with the magnetic shaft and the traction component. It eliminates the need for additional power margins in selection. The magnetic sleeve does not experience mechanical friction loads when compensating for and counteracting gravitational loads, reducing the load requirements during system selection, saving structural costs, and improving probe control accuracy.

[0007] As a further optimization of this utility model, an annular gap is formed between the magnetic shaft and the magnetic sleeve.

[0008] As a further optimization of this utility model, the upper end of the magnetic shaft is provided with fastener one, and the lower end of the magnetic shaft is provided with fastener two. The magnetic shaft is fixedly connected to the frame through fastener one and fastener two.

[0009] As a further optimization of this utility model, the first fastener includes an upper fixing seat and an upper clamping cover, the second fastener includes a lower fixing seat and a lower clamping cover, the upper end of the magnetic shaft is fixed between the upper fixing seat and the upper clamping cover, and the lower end of the magnetic shaft is fixed between the lower fixing seat and the lower clamping cover.

[0010] As a further optimization of this utility model, the traction assembly includes a locking member and a constant force frame, the magnetic sleeve is fixed between the locking member and the constant force frame, and the front part of the constant force frame is fixedly mounted on the cantilever mechanism.

[0011] The beneficial effects of this utility model are as follows:

[0012] 1) This utility model compensates for and cancels gravity loads through a magnetic constant force levitation protection device. The magnetic sleeve of the magnetic axis of the protection device provides magnetic levitation force. The magnetic sleeve pulls the cantilever mechanism upward through the constant force frame. The magnetic sleeve and the magnetic shaft are in clearance fit, so there is no need to add extra power margin for selection. There is no mechanical friction load when the magnetic sleeve compensates for and cancels gravity loads, which reduces the load requirements when selecting the system, saves structural costs, reduces maintenance costs and shortens the maintenance cycle.

[0013] 2) This utility model provides a vertically upward traction force to the cantilever mechanism through a magnetic sleeve and traction assembly. When a power failure occurs, the voice coil motor loses its Ampere force. Under the action of the magnetic sleeve and traction assembly, the cantilever mechanism and probe assembly are prevented from falling downward due to gravity load, thus preventing the probe from damaging the circuit board and providing protection for the probe to measure the workpiece.

[0014] 3) By setting a magnetic constant force suspension protection device on one side of the flying probe machine, this utility model can avoid the influence of the gravity load of the cantilever mechanism and probe assembly on the probe control accuracy, reduce the settling time of the control system, improve the dynamic response, and thus improve the testing efficiency of the system. In turn, it reduces the risk factor of the flying probe machine measurement system caused by the vibration of the probe tip and the needle mark problem caused by overshoot due to the positioning accuracy and the disturbance of the control system. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present invention;

[0016] Figure 2 This is a perspective view of the present invention from another angle;

[0017] Figure 3 This is a side view of the present invention;

[0018] Figure 4 This is a front view of the present invention.

[0019] In the diagram: 1. Magnetic shaft; 2. Magnetic sleeve; 3. Traction assembly; 4. Fastener one; 5. Fastener two; 6. Rotary drive component; 7. Frame; 8. Vertical linear drive mechanism; 9. Cantilever mechanism; 10. Probe assembly; 11. Guide rail; 12. Slider; 301. Locking component; 302. Constant force frame; 401. Upper fixed seat; 402. Upper clamping cover; 501. Lower fixed seat; 502. Lower clamping cover; 801. Voice coil motor stator; 802. Voice coil motor mover; 901. Connecting seat; 902. Cantilever bracket. Detailed Implementation

[0020] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0021] Example

[0022] like Figure 1 As shown, this embodiment relates to a protective device for a flying needle machine measurement system. The protective device includes a magnetic shaft 1 and a magnetic sleeve 2 sleeved on the magnetic shaft 1. An annular gap is formed between the magnetic shaft 1 and the magnetic sleeve 2, and the magnetic shaft 1 is used to provide magnetic levitation force to the magnetic sleeve 2. A traction assembly 3 is fixed to the front side of the magnetic sleeve 2. A fastener 4 is provided at the upper end of the magnetic shaft 1, and a fastener 5 is provided at the lower end of the magnetic shaft 1. The flying needle machine measurement system includes a flying needle machine and the above-mentioned protective device, and the protective device is installed on one side of the flying needle machine. The flying needle machine measurement system consists of a flying needle machine and a protective device. The flying needle machine includes a rotary drive 6, a frame 7 fixed to the output end of the rotary drive 6, a vertical linear drive mechanism 8 fixed to the front of the frame 7, a cantilever mechanism 9 vertically slidably mounted on the frame 7, and a probe assembly 10 provided at the head end of the cantilever mechanism 9. The tail end of the cantilever mechanism 9 is fixed to the output end of the vertical linear drive mechanism 8. This flying needle machine adjusts the position of the probe assembly 10 using a combination of R+Z axis motion. The rotary drive 6 rotates the frame 7 along the R axis, and the vertical linear drive mechanism 8 moves the cantilever mechanism 9 along the Z axis. A protective device is located on one side of the frame 7. Both ends of the magnetic shaft 1 are fixed to the frame 7, and the end of the traction assembly 3 furthest from the magnetic sleeve 2 is fixed to the cantilever mechanism 9. The magnetic shaft 1 provides magnetic levitation force to the magnetic sleeve 2, which, through the traction assembly 3, pulls the cantilever mechanism 9 upwards to counteract or compensate for the gravitational load on the cantilever mechanism 9 and the probe assembly 10, thus improving the probe control accuracy of the flying needle machine.

[0023] When installing the protective device, the upper and lower ends of the magnetic shaft 1 are fixed to one side of the frame 7 using fasteners 4 and 5, and the front and rear ends of the traction assembly 3 are respectively fixed to the magnetic sleeve 2 and the cantilever mechanism 9. During the testing of the circuit board by the flying probe machine, the magnetic shaft 1 of the protective device provides a vertically upward magnetic levitation force to the magnetic sleeve 2, thereby causing the magnetic sleeve 2 to provide an upward traction force to the cantilever mechanism 9 through the traction assembly 3.

[0024] When the flying needle machine drives the cantilever mechanism 9 to move downward, under the magnetic levitation force of the magnetic shaft 1 and the magnetic sleeve 2, the upward traction force of the traction component 3 on the cantilever mechanism 9 offsets the influence of the gravity load of the cantilever mechanism 9 and the probe assembly 10 on the flying needle machine; when the flying needle machine drives the cantilever mechanism 9 to move upward, under the magnetic levitation force of the magnetic shaft 1 and the magnetic sleeve 2, the upward traction force of the traction component 3 on the cantilever mechanism 9 compensates for the influence of the gravity load of the cantilever mechanism 9 and the probe assembly 10 on the flying needle machine.

[0025] Specifically, such as Figure 2-4 As shown, the motion combination of the R+Z axes of the flying needle probe measuring system is driven by the rotary motion of the DD motor and the vertical motion of the voice coil motor. The DD motor is the rotary drive component 6 of the flying needle probe, and the voice coil motor is the vertical linear drive mechanism 8 of the flying needle probe. The voice coil motor consists of a voice coil motor stator 801 and a voice coil motor mover 802. The cantilever mechanism 9 consists of an L-shaped connecting seat 901 and a cantilever bracket 902 fixed to the front end of the connecting seat 901. The connecting seat 901 is the tail end of the cantilever mechanism 9, and the suspension end of the cantilever bracket 902 is the head end of the cantilever mechanism 9, used to mount the probe assembly 10.

[0026] The front two sides of the frame 7 are fixed with parallel guide rails 11 of equal height, and sliders 12 are slidably mounted on the front side of the guide rails 11. The frame 7 is fixed to the mover of the DD motor, and the voice coil motor stator 801 is fixedly mounted on the front of the frame 7. The frame 7 is a machined part, which ensures the perpendicularity of the voice coil motor stator 801 to the guide rails 11. The voice coil motor mover 802 is a skeleton structure with a wound metal coil, the upper part of which is embedded in the inner cavity of the voice coil motor stator 801. The bottom of the voice coil motor mover 802 is fixedly connected to the bottom of the L-shaped connecting seat 901, and the two sides of the L-shaped connecting seat 901 are respectively fixed to the mounting surfaces of the two sliders 12. The voice coil motor is connected to a driver. Under the control of the driver and the guidance of the guide rail 11 and the slider 12, the voice coil motor mover 802 moves up and down in a linear motion. The voice coil motor mover 802 then drives the cantilever bracket 902 and the probe assembly 10 to move up and down in a linear motion through the connecting seat 901, thereby realizing the contact and separation of the probe with the circuit board pads in sequence, and completing the testing process.

[0027] Since the voice coil motor mover 802 is a skeleton structure with a wound metal coil and is fixed to the connecting seat 901 and the slider 12, the cantilever bracket 902 on the connecting seat 901 and the probe assembly 10 together constitute a gravitational load on the movement of the voice coil motor mover 802. Without a protective device, if a sudden power outage occurs, the coil current disappears, the voice coil motor mover 802 loses its Ampere force, and under the action of the gravitational load, the probe assembly 10 falls downwards, potentially damaging the circuit board. Therefore, this embodiment includes a protective device on one side of the flying probe machine.

[0028] Please see Figure 2-4 The specific structure of the protection device is as follows: The protection device is a magnetic constant force levitation protection device, including a magnetic shaft 1 and a magnetic sleeve 2 sleeved on the magnetic shaft 1, which provides magnetic levitation force to the magnetic sleeve 2 through the magnetic shaft 1. An annular gap is formed between the magnetic shaft 1 and the magnetic sleeve 2. The upper end of the magnetic shaft 1 is provided with an upper fixing seat 401 and an upper clamping cover 402, and the lower end of the magnetic shaft 1 is provided with a lower fixing seat 501 and a lower clamping cover 502. The outer side of the magnetic sleeve 2 is provided with a locking member 301 and a constant force frame 302. The front part of the constant force frame 302 is fixedly installed on one side of the top of the connecting seat 901, and the rear part of the constant force frame 302 is fixedly connected to the locking member 301. The magnetic sleeve 2 is fixed between the locking member 301 and the constant force frame 302.

[0029] The upper fixing seat 401 has a U-shaped top with a groove structure, and the upper clamping cover 402 also has a groove structure. During the installation of the magnetic shaft 1, the upper end of the magnetic shaft 1 is installed between the groove structures of the upper fixing seat 401 and the upper clamping cover 402. The screws of the upper clamping cover 402 are used for pre-tightening, fixing the upper end of the magnetic shaft 1 to the upper fixing seat 401 and the upper clamping cover 402. One side of the bottom of the upper fixing seat 401 is fixed to the upper side of the frame 7. Then, the magnetic sleeve 2 is fitted onto the outside of the magnetic shaft 1. Similarly, the lower fixing seat 501 and the lower clamping cover 502 also have groove structures. After the lower end of the magnetic shaft 1 is installed between the groove structures of the lower fixing seat 501 and the lower clamping cover 502, the screws of the lower clamping cover 502 are used for pre-tightening, fixing the lower end of the magnetic shaft 1 to the lower fixing seat 501 and the lower clamping cover 502. This completes the fixing of the magnetic shaft 1.

[0030] Then, push the L-shaped connecting seat 901 to its upper limit position to install the constant force frame 302. The constant force frame 302 is an L-shaped structural device, with its front fixed to the connecting seat 901 and its rear having a groove structure for engaging with the magnetic sleeve 2. The locking member 301 also has a groove structure that engages with the magnetic sleeve 2. With the screw pre-tightened, the magnetic sleeve 2 is fixed between the constant force frame 302 and the groove structure of the locking member 301. Under the action of magnetic levitation force, the magnetic sleeve 2 has an upward tendency to move, and can provide an upward traction force to the connecting seat 901 and the cantilever bracket 902 through the constant force frame 302, eliminating the influence of the gravitational load on the cantilever bracket 902 and the probe assembly 10. This is the specific structure and working principle of the magnetic constant force levitation protection device. This protection device has the advantages of being simple, adjustable, and easy to maintain. It also has a compact structure and can stably provide a vertical upward traction force to the cantilever bracket 902 to overcome the adverse effects of gravitational load and improve the probe control accuracy.

[0031] The voice coil motor mover 802 drives the probe assembly 10 to move at high frequency via the cantilever bracket 902 on the connector 901. Because some pads are relatively small, precise control of the probe tip is required during testing, and high probe positioning accuracy is necessary. Without a magnetic levitation protection device, the probe may penetrate too deeply, damaging the circuit board and leaving needle marks; it may also fail to make proper contact, affecting signal measurement. Control and adjustment based on load and displacement are required, as probe jitter interference can easily occur.

[0032] The magnetic constant force levitation protection device in this embodiment compensates for and cancels the gravitational load of the flying probe measuring system, keeping the system load in a relatively constant and low-load state. This reduces the system settling time, thereby reducing interference to the probe, improving dynamic response and positioning accuracy; ultimately, it improves measurement efficiency and the accuracy of measurement data. It should be noted that the guide rail 11 and the slider 12 constitute the motion guiding mechanism of the flying probe measuring system, and the protection device in this embodiment is also used to cancel or compensate for the gravitational load of the motion guiding mechanism. In addition, the cantilever mechanism 9 can also be a bracket directly fixedly connected to the output end of the vertical linear drive mechanism 8.

[0033] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A protective device for a flying needle measuring system, the system comprising a frame, a cantilever mechanism vertically slidably mounted on the frame, and a probe assembly disposed at the head end of the cantilever mechanism, characterized in that: The protective device includes a magnetic shaft and a magnetic sleeve fitted on the magnetic shaft. Both ends of the magnetic shaft are fixedly mounted on the frame. A traction component is fixed between the cantilever mechanism and the magnetic sleeve. The magnetic shaft is used to provide magnetic levitation force to the magnetic sleeve to counteract or compensate for the gravitational load of the cantilever mechanism and the probe assembly.

2. The protective device for a flying needle machine measurement system according to claim 1, characterized in that: An annular gap is formed between the magnetic shaft and the magnetic sleeve.

3. The protective device for a flying needle machine measurement system according to claim 1, characterized in that: The upper end of the magnetic shaft is provided with fastener one, and the lower end of the magnetic shaft is provided with fastener two. The magnetic shaft is fixedly connected to the frame by fastener one and fastener two.

4. The protective device for a flying needle machine measurement system according to claim 3, characterized in that: The first fastener includes an upper fixing seat and an upper clamping cover, and the second fastener includes a lower fixing seat and a lower clamping cover. The upper end of the magnetic shaft is fixed between the upper fixing seat and the upper clamping cover, and the lower end of the magnetic shaft is fixed between the lower fixing seat and the lower clamping cover.

5. The protective device for a flying needle machine measurement system according to claim 1, characterized in that: The traction assembly includes a locking member and a constant force frame. The magnetic sleeve is fixed between the locking member and the constant force frame, and the front part of the constant force frame is fixedly mounted on the cantilever mechanism.

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