A flying probe fixing device for a flying probe testing machine

Abstract

This invention relates to the field of flying probe testing technology, specifically to a flying probe fixing device for a flying probe testing machine. The device includes an insulating base and a probe tip. A fixing seat is provided on the front side of the insulating base, and an installation groove is provided on the end side of the fixing seat. At least two horizontal grooves are provided on the upper surface of the plate-shaped probe tip, and multiple positioning screw holes are provided within the two horizontal grooves. A spring plate is fixed to the inner wall of the mounting groove, and a positioning nut is fixed to the outer end of the spring plate. At least two buffer sliding grooves are provided on the upper surface of the fixing seat. A connecting piece is slidably mounted up and down within the mounting groove via a horizontally sliding telescopic rod. Positioning rings are provided at both ends of the connecting piece. Locking screws are inserted into both buffer sliding grooves. This invention allows the probe tip to contact the PCB board surface in a buffered, retracted state, thereby reducing the occurrence of probe tip breakage or wear during use due to impact, while not affecting the fixation of the probe tip inside the fixing seat.

Description

Technical Field

[0001] This invention relates to the field of flying probe testing machine technology, specifically to a flying probe fixing device for a flying probe testing machine. Background Technology

[0002] A flying probe tester is an instrument used to test PCBs (printed circuit boards) with high component density, many layers, high wiring density, and small test point distances. It mainly tests the insulation and continuity of the circuit board.

[0003] Application number CN201320397093.7, patent titled "Test Probe for a Flying Probe Tester," includes a needle tip and a needle base. The needle base is injection molded, and the needle tip is fixed to the needle base during injection molding, forming an integral structure. The needle tip is a thin sheet structure, with its bottom end fixed to the needle base. A concave arc surface is provided at the top of the needle tip, and the intersection of the arc surface and the side surface forms the needle tip. A needle hole is provided in the middle of the needle tip, and the needle hole is connected to the wires of the test circuit.

[0004] It is obvious that when the probes of existing flying probe testers are installed and used, most of the probes are fixed to the tester by an insulating base, and the probe and the insulating base are integrally formed. Since the tester drives the probe to quickly contact the PCB board, the impact force generated when the probe contacts the PCB board can cause the probe to break or wear after long-term use, thus affecting the service life of the probe. At the same time, it is not convenient to remove the probe from the insulating base. Summary of the Invention

[0005] The purpose of this invention is to provide a flying probe fixing device for a flying probe testing machine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a flying probe fixing device for a flying probe testing machine, comprising an insulating base and a probe tip. A fixing seat is provided on the front side of the insulating base, and a mounting groove is formed on the end side of the fixing seat. A probe tip is mounted in the mounting groove via a buffer fixing assembly. The buffer fixing assembly includes a spring plate, a positioning nut, a telescopic rod, a connecting plate, a positioning ring, and a locking screw. At least two horizontal grooves are formed on the upper surface of the plate-shaped probe tip, and multiple positioning screw holes are formed within the two horizontal grooves. A spring plate is fixed to the inner wall of the mounting groove. The outer end of the spring sheet is fixed with a positioning nut. The upper surface of the fixed seat is provided with at least two buffer grooves, and each buffer groove is connected to the mounting groove. A connecting piece is slidably arranged up and down in the mounting groove through a horizontally sliding telescopic rod. The connecting piece is located between the two buffer grooves. Both ends of the connecting piece are provided with positioning rings, and the center hole of the positioning ring is aligned with the center hole of the positioning thread nut. Locking screws are inserted into both buffer grooves, and the lower ends of the locking screws are threaded through the positioning ring and the positioning nut, respectively, and threaded into the corresponding positioning screw holes.

[0007] Preferably, the upper surface of the fixed section of the needle is provided with an arc-shaped block, and the connecting piece is configured as an arch shape, with the arch-shaped connecting piece slidingly attached to the upper surface of the arc-shaped block.

[0008] Preferably, the upper surface of the arc-shaped block is provided with multiple buffer slots in the horizontal direction, and the lower surface of the connecting piece is provided with an elastic buffer strip, which is elastically engaged into the corresponding buffer slot.

[0009] Preferably, a buffer layer is provided between two adjacent spring sheets, one side of the buffer layer is fixed to the inner wall of the mounting groove, and the other side of the buffer layer is in contact with the side of the needle.

[0010] Preferably, a buffer cavity is provided in the buffer layer, and the interior of the buffer cavity is connected to the cooling air pipe of the cooling system provided inside the testing machine. A cooling cavity is provided in the lower wall of the mounting slot, and an air jet hole is provided on the upper end face of the cooling cavity. The cooling cavity is connected to the buffer cavity.

[0011] Preferably, the upper surface of the mounting groove is coated with a graphene layer.

[0012] Preferably, the upper surface of the fixing base is provided with a conductive sheet, and the conductive sheet is sleeved on the locking screw, and a current-carrying wire is connected to one side of the conductive sheet.

[0013] Preferably, the insulating base and the fixing base are integrally formed and both are made of insulating plastic.

[0014] Preferably, the insulating seat has a threaded hole, and the insulating seat is installed on the testing machine by a bolt connected to the internal thread of the threaded hole.

[0015] Preferably, the insulating base has rounded chamfers around its perimeter.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This invention utilizes a spring sheet and a slidably fixed locking screw installed inside the fixing base. When the needle tip moves rapidly to the PCB board surface, the needle moves into the mounting groove, while the locking screw moves within the buffer groove. At this time, the spring sheet is compressed, allowing the needle to contact the PCB board surface in a buffered and contracted state. This reduces the risk of breakage or wear of the needle due to impact during use, while maintaining the needle's fixation within the fixing base.

[0018] 2. This invention features an arc-shaped block and an arched connecting piece on the upper surface of the fixed section of the needle. The arched connecting piece clamps tightly against the upper surface of the arc-shaped block on the fixed section of the needle. Simultaneously, the elastic buffer strip is elastically engaged in the buffer groove on the upper surface of the arc-shaped block. This increases the stability of the clamping fit between the connecting piece and the arc-shaped block, allowing the arc-shaped block and the connecting piece to form a unified whole. This, in turn, increases the stability of the needle's sliding and buffering within the mounting groove, and also increases the stability of the connection between the needle and the locking screw, preventing misalignment of the locking screw when the needle slides within the mounting groove. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention;

[0020] Figure 2 This is a schematic diagram of the structure of the buffer fixing component of the present invention;

[0021] Figure 3 This is an exploded schematic diagram of the fixing device of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the needle of the present invention;

[0023] Figure 5 This is a cross-sectional view of the fixing base of the present invention;

[0024] Figure 6 For the present invention Figure 5 Enlarged view of a portion of point A in the middle.

[0025] In the diagram: 1. Insulating base; 2. Needle; 21. Horizontal groove; 22. Positioning screw hole; 3. Fixing base; 31. Mounting groove; 32. Buffer slide; 33. Cooling cavity; 4. Buffer fixing assembly; 41. Spring plate; 42. Positioning nut; 43. Telescopic rod; 44. Connecting piece; 45. Positioning ring; 46. Locking screw; 5. Arc-shaped block; 51. Buffer slot; 6. Elastic buffer strip; 7. Buffer layer; 71. Buffer cavity; 8. Conductive sheet. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] Example 1:

[0028] like Figures 1 to 6As shown, the present invention provides a technical solution for a flying probe fixing device for a flying probe testing machine: A flying probe fixing device for a flying probe testing machine includes an insulating base 1 and a probe 2. A fixing base 3 is provided on the front side of the insulating base 1, and an installation groove 31 is opened on the end side of the fixing base 3. The probe 2 is installed in the installation groove 31 by a buffer fixing assembly 4. The buffer fixing assembly 4 includes a spring plate 41, a positioning nut 42, a telescopic rod 43, a connecting plate 44, a positioning ring 45, and a locking screw 46. At least two horizontal grooves 21 are opened on the upper surface of the plate-shaped probe 2, and multiple positioning screw holes 22 are opened in the two horizontal grooves 21. A spring is fixed on the inner wall of the installation groove 31. The spring plate 41 has a positioning nut 42 fixed to its outer end. The upper surface of the fixing seat 3 has at least two buffer grooves 32, and each buffer groove 32 is connected to the mounting groove 31. A connecting piece 44 is slidably mounted in the mounting groove 31 through a horizontally sliding telescopic rod 43. The connecting piece 44 is located between the two buffer grooves 32. Both ends of the connecting piece 44 are provided with positioning rings 45, and the center hole of the positioning ring 45 is aligned with the center hole of the positioning thread nut. A locking screw 46 is inserted into each of the two buffer grooves 32, and the lower end of the locking screw 46 is threaded through the positioning ring 45 and the positioning nut 42 and threaded to the corresponding positioning screw hole. Within 22; During operation, when flying probes need to be installed on a flying probe tester for testing PCB boards, the probes 2 of existing flying probe testers are mostly fixed to the tester via an insulating base 1, and the probe 2 and the insulating base 1 are integrally formed. Since the tester rapidly brings the probe 2 into contact with the PCB board, the impact force generated during contact can cause the probe 2 to break or wear over time, affecting its lifespan. Furthermore, it is inconvenient to remove the probe 2 from the insulating base 1. Therefore, this invention fixes the front end of the insulator base 3 with a mounting base 3. An internal buffer fixing component 4 is provided. When it is necessary to fix the plate-shaped needle 2, the operator inserts the fixing section of the needle 2 into the mounting groove 31. At this time, the two horizontal grooves 21 will slide in contact with the positioning nut 42 at the end of the spring plate 41, and the screw hole of the positioning nut 42 will be aligned with the corresponding positioning screw hole 22. Then, the locking screw 46 is inserted into the positioning ring 45 through the buffer slide groove 32. As the locking screw 46 rotates continuously, its bottom end can pass through the positioning ring 45 and extend into the positioning nut 42, and be threaded into the positioning screw hole 22. Then, the locking screw 46 is twisted to fix the needle 2 with a fixing torque, thereby fixing the needle 2 into the fixing seat 3.Because there is a certain distance between the fixed section of the needle 2 and the mounting groove 31, and the spring plate 41 provides elastic restraint, while the locking screw 46 can move within the buffer groove 32, when the tip of the needle 2 moves rapidly to the PCB board surface, the needle 2 will move into the mounting groove 31, and the locking screw 46 will move within the buffer groove 32. At this time, the spring plate 41 will be compressed, allowing the needle 2 to contact the PCB board surface in a buffered and contracted state, thus reducing the possibility of breakage or wear of the needle 2 due to impact, while not affecting the fixation of the needle 2 inside the fixing seat 3. When the needle 2 needs to be replaced, the operator rotates the locking screw 46 in the reverse direction, allowing the locking screw 46 to disengage from the positioning screw hole 22 and the positioning ring 45, and then pulls the needle 2 outward, allowing the needle 2 to be removed from the mounting groove 31 for replacement.

[0029] In one embodiment of the present invention, an arc-shaped block 5 is provided on the upper surface of the fixed section of the needle 2, and the connecting piece 44 is configured in an arch shape, with the arch-shaped connecting piece 44 slidingly attached to the upper surface of the arc-shaped block 5. During operation, when the locking screw 46 drives the connecting piece 44 to attach to the upper surface of the fixed section of the needle 2 through the positioning ring 45, the arch-shaped connecting piece 44 can clamp and attach to the upper surface of the arc-shaped block 5 on the upper surface of the fixed section of the needle 2, thereby increasing the stability of the needle 2 in the mounting groove 31. At the same time, the connecting piece 44 is slidably disposed in the mounting groove 31 through the telescopic rod 43, thus not affecting the buffered movement of the needle 2 inside the mounting groove 31 of the fixed seat 3.

[0030] In one embodiment of the present invention, the upper surface of the arc-shaped block 5 is provided with a plurality of buffer slots 51 in the horizontal direction, and the lower surface of the connecting piece 44 is provided with an elastic buffer strip 6. The elastic buffer strip 6 is elastically engaged into the corresponding buffer slot 51. During operation, when the arched connecting piece 44 is pushed by the locking screw 46 to adhere to the upper surface of the arc-shaped block 5, the elastic buffer strip 6 is elastically engaged in the buffer slot 51 on the upper surface of the arc-shaped block 5. This increases the stability of the clamping and fitting of the connecting piece 44 and the arc-shaped block 5, so that the arc-shaped block 5 and the connecting piece 44 can form a whole. This increases the stability of the sliding buffer of the needle 2 in the mounting groove 31, and at the same time increases the stability of the connection between the needle 2 and the locking screw 46, preventing the locking screw 46 from misaligning when the needle 2 slides in the mounting groove 31.

[0031] In one embodiment of the present invention, a buffer layer 7 is provided between two adjacent spring sheets 41. One side of the buffer layer 7 is fixed to the inner wall of the mounting groove 31, and the other side of the buffer layer 7 is in contact with the side of the needle 2. During operation, the buffer layer 7 is provided inside the mounting groove 31, and the buffer layer 7 is in contact with the side of the needle 2. When the needle 2 slides in the mounting groove 31, the buffer layer 7 can further play a role in preventing the needle 2 from being damaged by impact when the fixed section of the needle 2 slides in the mounting groove 31.

[0032] In one embodiment of the present invention, a buffer cavity 71 is provided inside the buffer layer 7. The buffer cavity 71 is connected to the cooling system's cooling pipe inside the testing machine. A cooling cavity 33 is provided inside the lower wall of the mounting groove 31, and an air jet hole is provided on the upper surface of the cooling cavity 33. The cooling cavity 33 is connected to the buffer cavity 71. During operation, when the needle 2 continuously squeezes the buffer layer 7, cooling gas is introduced into the cooling pipe inside the buffer cavity 71 and compressed into the cooling cavity 33. The gas then passes through the air jet hole on the upper surface of the cooling cavity 33. The nozzle sprays into the mounting groove 31, which facilitates the cooling of the heat generated by the sliding friction of the needle 2 on the lower surface of the mounting groove 31. This prevents the fixed section of the needle 2 from sliding in the mounting groove 31 for a long time, which would cause wear and excessive heat release. When the needle 2 is released from the pressure of the buffer layer 7, the buffer chamber 71 is released from the pressure and cooling gas is drawn in through the cooling pipe, which facilitates the heat dissipation of the cooling chamber 33. One-way valves are provided at the cooling pipe and at the connection between the cooling chamber 33 and the buffer chamber 71.

[0033] As one embodiment of the present invention, the upper surface of the mounting groove 31 is coated with a graphene layer; during operation, graphene has good thermal conductivity and lubrication effects, thereby reducing the friction between the fixed section of the needle 2 and the mounting groove 31.

[0034] In one embodiment of the present invention, a conductive sheet 8 is provided on the upper surface of the fixed base 3, and the conductive sheet 8 is sleeved on the locking screw 46. A current-carrying wire is connected to one side of the conductive sheet 8. During operation, when the locking screw 46 is connected to the positioning ring 45, the conductive sheet 8 needs to be sleeved on the locking screw 46 first. As the locking screw 46 rotates continuously, it passes through the positioning ring 45 and the positioning nut 42 and connects to the positioning screw hole 22. At this time, the locking screw 46 can act as a conductive wire to connect the electrical signal of the needle 2 to the testing machine.

[0035] In one embodiment of the present invention, the insulating base 1 and the fixed base 3 are integrally formed and are both made of insulating plastic; the insulating base 1 has a threaded hole, and the insulating base 1 is installed on the testing machine through a bolt connected by the internal thread of the threaded hole; the insulating base 1 has rounded chamfers around its perimeter.

[0036] Working principle: When it is necessary to fix the plate-shaped needle 2, the operator inserts the fixing section of the needle 2 into the mounting groove 31. At this time, the two horizontal grooves 21 will slide into contact with the positioning nut 42 at the end of the spring plate 41, and the screw hole of the positioning nut 42 will be aligned with the corresponding positioning screw hole 22. Then, the locking screw 46 is inserted into the positioning ring 45 through the buffer slide groove 32. As the locking screw 46 rotates continuously, its bottom end can pass through the positioning ring 45 and extend into the positioning nut 42, and be threaded into the positioning screw hole 22. Then, the locking screw 46 is twisted to fix the needle 2 with a fixing torque, thereby fixing the needle 2 into the fixing seat 3. Since there is a certain distance between the fixing section of the needle 2 and the mounting groove 31, and the spring plate 41 provides elastic limit, while the locking screw 46 can be adjusted in a buffered manner... The needle 2 moves within the buffer groove 32, thus limiting its movement. When the tip of the needle 2 moves rapidly to the PCB board surface, the needle 2 moves into the mounting groove 31, while the locking screw 46 moves within the buffer groove 32. At this time, the spring plate 41 is compressed, allowing the needle 2 to be in a buffered contraction state when it reaches the PCB board surface. This reduces the risk of breakage or wear of the needle 2 due to impact, while maintaining its fixation within the mounting base 3. When the needle 2 needs to be replaced, the operator rotates the locking screw 46 in the opposite direction, disengaging it from the positioning screw hole 22 and the positioning ring 45. Then, the needle 2 is pulled outward to remove it from the mounting groove 31 for replacement.

[0037] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A flying probe fixing device for a flying probe testing machine, comprising an insulating base (1) and a probe tip (2), characterized in that, The front side of the insulating base (1) is provided with a fixing base (3), and the side end of the fixing base (3) is provided with a mounting groove (31). The mounting groove (31) is installed with a needle (2) by means of a buffer fixing assembly (4). The buffer fixing assembly (4) includes a spring plate (41), a positioning nut (42), a telescopic rod (43), a connecting plate (44), a positioning ring (45), and a locking screw (46). The upper surface of the plate-shaped needle (2) is provided with at least two horizontal grooves (21), and multiple positioning screw holes (22) are provided in the two horizontal grooves (21). The inner wall of the mounting groove (31) is fixed with a spring plate (41), and the outer end of the spring plate (41) is fixed with a positioning nut (42). The upper surface of the fixed base (3) is provided with at least two buffer slide grooves (32), and each buffer slide groove (32) is connected to the mounting groove (31). A connecting piece (44) is slidably arranged up and down in the mounting groove (31) by a horizontally sliding telescopic rod (43). The connecting piece (44) is located between the two buffer slide grooves (32). Both ends of the connecting piece (44) are provided with positioning rings (45), and the center hole of the positioning ring (45) is aligned with the center hole of the positioning thread nut. Locking screws (46) are inserted into both buffer slide grooves (32), and the lower end of the locking screw (46) is threaded through the positioning ring (45) and the positioning nut (42) and threaded into the corresponding positioning screw hole (22). The upper surface of the fixed section of the needle (2) is provided with an arc-shaped block (5), and the connecting piece (44) is set in an arch shape, and the arch-shaped connecting piece (44) slides and fits against the upper surface of the arc-shaped block (5); The upper surface of the arc-shaped block (5) is provided with multiple buffer slots (51) in the horizontal direction, and the lower surface of the connecting piece (44) is provided with an elastic buffer strip (6), which is elastically engaged into the corresponding buffer slot (51). A buffer layer (7) is provided between two adjacent spring sheets (41). One side of the buffer layer (7) is fixed to the inner wall of the mounting groove (31), and the other side of the buffer layer (7) is in contact with the side of the needle (2).

2. The flying probe fixing device for a flying probe testing machine according to claim 1, characterized in that: The buffer layer (7) has a buffer cavity (71) inside, and the interior of the buffer cavity (71) is connected to the cooling pipe of the cooling system inside the testing machine. The lower wall of the mounting groove (31) has a cooling cavity (33) inside, and the upper end face of the cooling cavity (33) has an air jet hole. The cooling cavity (33) is connected to the buffer cavity (71).

3. The flying probe fixing device for a flying probe testing machine according to claim 2, characterized in that: The upper surface of the mounting groove (31) is coated with a graphene layer.

4. The flying probe fixing device for a flying probe testing machine according to claim 1, characterized in that: The upper surface of the fixing base (3) is provided with a conductive sheet (8), and the conductive sheet (8) is sleeved on the locking screw (46). One side of the conductive sheet (8) is connected to a power-carrying wire.

5. The flying probe fixing device for a flying probe testing machine according to claim 1, characterized in that: The insulating base (1) and the fixing base (3) are integrally formed and are both made of insulating plastic.

6. The flying probe fixing device for a flying probe testing machine according to claim 1, characterized in that: The insulating seat (1) has a threaded hole, and the insulating seat (1) is installed on the testing machine by a bolt connected to the internal thread of the threaded hole.

7. The flying probe fixing device for a flying probe testing machine according to claim 6, characterized in that: The insulating base (1) has rounded chamfers around its perimeter.

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