Detection adapter for assisting piezoelectric sensors

Abstract

The utility model provides a kind of for the detection adapter of auxiliary piezoelectric sensor, including upper guide block, lower guide block, left locking piece, right locking piece, upper connecting pin and lower connecting pin. Through the mirror image symmetry design and vertical setting guide slot of upper guide block and lower guide block, the accurate alignment of measured contact plug and piezoelectric sensor can be realized, it is ensured that the contact of contact plug is just located in the strain sensitive area center of piezoelectric sensor, and both keep vertical contact, match the direction sensitivity requirement of piezoelectric sensor, significantly improve the accuracy and reliability of clamping force detection. The detection requirement of different specifications MNS low-voltage switchgear contact plug, only need to replace the adapter of corresponding width guide slot. Adapter is connected by upper and lower clamping jaw and the clamping groove of piezoelectric sensor, can realize the quick positioning installation with piezoelectric sensor, dismounting is convenient, improve the versatility of contact point clamping force detection equipment, effectively reduce use cost.

Description

Technical Field

[0001] This utility model relates to the field of sensor detection adapter technology, specifically a detection adapter for assisting piezoelectric sensors. Background Technology

[0002] The clamping force of the contact plates in MNS low-voltage switchgear plays a crucial role in electrical connections, directly affecting connection stability, safety, and service life. Appropriate clamping force ensures a tight fit between the contacts and conductors, reducing contact resistance, preventing loosening due to vibration or thermal expansion and contraction, minimizing air gaps at the contact surfaces, suppressing arcing and oxide layer formation, and resisting the electromagnetic force generated by the operating current to prevent contact separation. Insufficient clamping force leads to poor contact, while excessive clamping force damages the contacts or conductors.

[0003] The clamping force of the contact points is typically measured using a pressure sensor. Pressure sensors are based on the piezoelectric effect, converting pressure signals into electrical charges. (See attached image.) Figure 1 This is a schematic diagram of a piezoelectric sensor, where the front end of the piezoelectric sensor 90 is a piezoelectric part 91 used for detecting pressure. Figure 2 This is a structural diagram of a contact insert of a certain model of MNS low-voltage switchgear. The clamping force between the two contacts 81 on the contact insert 80 plays a crucial role in the electrical connection. The piezoelectric sensor 90 is a detection tool used to measure the clamping force between the two contacts 81 on the contact insert 80. Figure 3 As shown, when using the piezoelectric sensor 90 to test the contact clamping force of the contact insert 80, due to the directional sensitivity of the piezoelectric effect, the contact needs to be located as close as possible to the center of the strain-sensitive area of ​​the piezoelectric part, and in perpendicular contact with the contact. Therefore, an adapter that can assist the piezoelectric sensor in detection is needed. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a detection adapter for auxiliary piezoelectric sensors.

[0005] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is: a detection adapter for assisting a piezoelectric sensor, comprising an upper guide block, a lower guide block, a left locking piece, a right locking piece, an upper connecting pin, and a lower connecting pin; The upper guide block and the lower guide block are arranged vertically at intervals, with a spacing space between them for the piezoelectric sensor to pass through. The upper guide block and the lower guide block are mirror-symmetrically distributed. Each of the upper guide block and the lower guide block has a guide groove at the middle position in the left-right direction for the probe piece to be tested to pass through. The guide groove is perpendicular to the spacing space. The left locking piece is located to the left of the upper and lower guide blocks, and the right locking piece is located to the right of the upper and lower guide blocks. The upper parts of the left and right locking pieces are connected to the upper guide block via an upper connecting pin, and the lower parts of the left and right locking pieces are connected to the lower guide block via a lower connecting pin. The left and right locking pieces are mirror-symmetrically distributed. Both the left and right locking pieces have an opening facing the rear at the middle position in the vertical direction. The inner side of the opening is provided with an upper claw and a lower claw. The front ends of the upper claw and the lower claw are provided with opposing protrusions. The protrusions are used to engage with the slot at the root of the piezoelectric part at the front end of the piezoelectric sensor.

[0006] By employing the technical solution of this utility model, the mirror-symmetric design of the upper and lower guide blocks and the vertically arranged guide groove enable precise alignment between the tested contact insert and the piezoelectric sensor. This ensures that the contact point of the contact insert is precisely located at the center of the strain-sensitive area of ​​the piezoelectric sensor, and that the two maintain perpendicular contact, matching the directional sensitivity requirements of the piezoelectric sensor and significantly improving the accuracy and reliability of clamping force detection. For different specifications of MNS low-voltage switchgear contact inserts requiring testing, only the adapter with the corresponding width of the guide groove needs to be replaced. The adapter engages with the piezoelectric sensor's slot via upper and lower jaws, enabling quick positioning and installation with the piezoelectric sensor. This convenient assembly and disassembly enhances the versatility of the contact clamping force detection equipment and effectively reduces operating costs.

[0007] Furthermore, the front part of the upper surface of the upper guide block is a slope that gradually slopes downward from back to front, the front part of the lower surface of the lower guide block is a slope that gradually slopes upward from back to front, and the front ends of the left locking piece and the right locking piece are pointed angles that gradually narrow from back to front.

[0008] By adopting the above-mentioned preferred solution, the overall volume occupied by the adapter in the testing space can be reduced, making it easier to operate in small spaces such as inside the switch cabinet, facilitating observation and operation, and improving the convenience of testing.

[0009] Furthermore, the upper guide block and the lower guide block are made of aluminum alloy.

[0010] By adopting the above-mentioned preferred solution, the tested contact plate can be better protected from wear.

[0011] Furthermore, the left locking piece and the right locking piece are made of stainless steel sheet.

[0012] Furthermore, the left and right locking plates are made of 17-4PH stainless steel.

[0013] Using the above-mentioned preferred solution, the 17-4PH stainless steel plate has excellent mechanical strength, hardness and corrosion resistance. The upper and lower jaws can generate appropriate elastic clamping force when clamping the piezoelectric sensor. The material has excellent fatigue resistance and can maintain stable clamping performance after long-term repeated use. It is not easy to deform or break, thus extending the service life of the adapter.

[0014] Furthermore, the left and right locking pieces are provided with connecting holes for connecting the upper and lower connecting pins, and the connecting holes are interference-fitted with the upper and lower connecting pins.

[0015] By adopting the above-mentioned preferred scheme, the interference fit design between the connecting hole and the connecting pin can achieve a tight connection between the locking piece and the guide block, ensuring the relative position stability of the locking piece and the guide block, thereby ensuring the alignment accuracy of the piezoelectric sensor and the test piece.

[0016] Furthermore, a strong adhesive is applied between the left locking piece and the left side of the upper guide block and the left side of the lower guide block, and a strong adhesive is applied between the right locking piece and the right side of the upper guide block and the right side of the lower guide block.

[0017] By adopting the above-mentioned preferred solution, the risk of loosening of the connection after long-term use is reduced, ensuring the stability and reliability of the overall structure of the adapter.

[0018] Furthermore, the guide slots of the upper guide block and the lower guide block are provided with outwardly expanding guide surfaces, and the included angle between the two opposing outwardly expanding guide surfaces is 40°.

[0019] The preferred design described above features an outwardly expanding guide surface at the guide slot opening, which serves as a guide, facilitating the quick and accurate insertion of the tested contact piece into the guide slot, reducing the difficulty of alignment during insertion, and improving testing efficiency.

[0020] Furthermore, if the thickness of the piezoelectric part at the front end of the piezoelectric sensor is a mm and the groove depth at the root of the piezoelectric part is 0.25 mm, then in the free state, the distance between the protrusions of the upper and lower jaws is (a-0.4) mm.

[0021] Furthermore, the thickness of the piezoelectric part at the front end of the piezoelectric sensor is 5mm. In the free state, the distance between the protrusions of the upper and lower jaws is 4.6mm. The thickness of the root of the upper and lower jaws is 0.8mm. The distance from the root of the upper and lower jaws to the rear end face of the left or right locking piece is 12.5mm. The opposing surfaces of the upper and lower jaws are inclined planes with an inclination of 1.25°.

[0022] By adopting the above-mentioned preferred solution and through precise size design, the insertion and extraction force between the adapter and the piezoelectric sensor is kept stable at 7N, while the insertion and extraction life is more than 90,000 cycles. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of an existing piezoelectric sensor.

[0025] Figure 2 This is a structural diagram of a contact insert for a certain model of the existing MNS low-voltage switchgear.

[0026] Figure 3 This is a schematic diagram of a prior art plug prong testing the contact clamping force on a piezoelectric sensor.

[0027] Figure 4 This is a structural schematic diagram of the adapter of this utility model.

[0028] Figure 5 This is an exploded structural diagram of the adapter of this utility model.

[0029] Figure 6 This is a schematic diagram of the adapter of this utility model installed on a piezoelectric sensor.

[0030] Figure 7 This is a schematic diagram of the contact clamping force test performed on the contact insert after the adapter of this utility model is installed at the front end of the piezoelectric sensor.

[0031] Figure 8 This is a partial schematic diagram of the front end of a piezoelectric sensor.

[0032] Figure 9 This is a schematic diagram of one embodiment of the left locking plate and the right locking plate.

[0033] Figure 10 This is a schematic diagram of another embodiment of the left and right locking plates.

[0034] The numbers and letters in the diagram represent the names of the corresponding components: 10-Upper guide block; 11-Gap space; 12-Guide groove; 13-Sloping surface; 14-Outwardly expanding guide surface; 20-Lower guide block; 30-Left locking piece; 31-Upper claw; 311-Protrusion; 32-Lower claw; 33-Connecting hole; 40-Right locking piece; 50-Upper connecting pin; 60-Lower connecting pin; 80-Contact insert; 81-Contact; 90-Piezoelectric sensor; 91-Piezoelectric part; 92-Slot. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] like Figures 1-3 As shown, Figure 1 This is a schematic diagram of the structure of the piezoelectric sensor 90, which has a slot 92 at the root of the front piezoelectric part 91. Figure 2 This is a structural diagram of a contact insert 80 of a model of MNS low-voltage switchgear. The clamping force between the two contacts 81 on the contact insert 80 plays a crucial role in the electrical connection. The piezoelectric sensor 90 is a detection tool used to measure the clamping force between the two contacts 81 on the contact insert 80.

[0037] like Figure 4-7 As shown, a detection adapter for assisting a piezoelectric sensor includes an upper guide block 10, a lower guide block 20, a left locking piece 30, a right locking piece 40, an upper connecting pin 50, and a lower connecting pin 60. The upper guide block 10 and the lower guide block 20 are arranged vertically at intervals, with a spacing space 11 between them for the piezoelectric sensor to pass through. The upper guide block 10 and the lower guide block 20 are mirror-symmetrically distributed. Each of the upper guide block 10 and the lower guide block 20 has a guide groove 12 at the middle position in the left-right direction for the probe insert 80 to be tested to pass through. The guide groove 12 is perpendicular to the spacing space 11. The left locking piece 30 is located to the left of the upper guide block 10 and the lower guide block 20, and the right locking piece 40 is located to the right of the upper guide block 10 and the lower guide block 20. The upper part of the left locking piece 30 and the upper part of the right locking piece 40 are connected to the upper guide block 10 via the upper connecting pin 50, and the lower part of the left locking piece 30 and the lower part of the right locking piece 40 are connected to the lower guide block 20 via the lower connecting pin 60. The left locking piece 30 and the right locking piece 40 are distributed in a mirror symmetrical manner. The left locking piece 30 and the right locking piece 40 are both provided with an opening facing the rear at the middle position in the vertical direction. The upper claw 31 and the lower claw 32 are provided inside the opening. The front ends of the upper claw 31 and the lower claw 32 are provided with oppositely arranged protrusions 311. The protrusions 311 are used to engage with the slot 92 at the root of the piezoelectric part 91 at the front end of the piezoelectric sensor 90.

[0038] The beneficial effects of adopting the above technical solution are as follows: Through the mirror-symmetric design of the upper and lower guide blocks and the vertically positioned guide grooves, precise alignment of the tested contact insert and the piezoelectric sensor can be achieved. This ensures that the contact point of the contact insert is precisely located at the center of the strain-sensitive area of ​​the piezoelectric sensor, and that the two maintain perpendicular contact, matching the directional sensitivity requirements of the piezoelectric sensor and significantly improving the accuracy and reliability of clamping force detection. For different specifications of MNS low-voltage switchgear contact inserts requiring testing, only the adapter with the corresponding width of the guide groove needs to be replaced. The adapter engages with the piezoelectric sensor's slots via upper and lower jaws, enabling rapid positioning and installation with the piezoelectric sensor. This convenient assembly and disassembly enhances the versatility of the contact clamping force detection equipment and effectively reduces operating costs.

[0039] like Figure 5 As shown, in some other embodiments of this utility model, the front part of the upper surface of the upper guide block 10 is a slope 13 that gradually slopes downward from back to front, the front part of the lower surface of the lower guide block 20 is a slope 13 that gradually slopes upward from back to front, and the front ends of the left locking piece 30 and the right locking piece 40 are pointed angles that gradually narrow from back to front. The beneficial effects of adopting the above technical solution are: it can reduce the overall volume occupied by the adapter in the detection space, facilitate operation in small spaces such as inside the switch cabinet, facilitate observation and operation, and improve the convenience of detection.

[0040] In some other embodiments of this utility model, the upper guide block 10 and the lower guide block 20 are made of aluminum alloy. The beneficial effect of adopting the above technical solution is that it can better protect the tested contact plate from wear.

[0041] In some other embodiments of this utility model, the left locking piece 30 and the right locking piece 40 are made of stainless steel plates.

[0042] In some other embodiments of this utility model, the left locking piece 30 and the right locking piece 40 are made of 17-4PH stainless steel. The beneficial effects of adopting the above technical solution are: 17-4PH stainless steel has excellent mechanical strength, hardness, and corrosion resistance; the upper and lower jaws can generate suitable elastic clamping force when clamping the piezoelectric sensor; the material has excellent fatigue resistance and can maintain stable clamping performance even after long-term repeated use, making it less prone to deformation or breakage, thus extending the service life of the adapter.

[0043] In some other embodiments of this utility model, the left locking piece 30 and the right locking piece 40 are provided with connecting holes 33 for connecting the upper connecting pin 50 and the lower connecting pin 60, respectively. The connecting holes 33 are interference-fitted with the upper connecting pin 50 and the lower connecting pin 60. The beneficial effect of adopting the above technical solution is that the interference fit design between the connecting holes and the connecting pins enables a tight connection between the locking pieces and the guide block, ensuring the relative position stability of the locking pieces and the guide block, thereby ensuring the alignment accuracy of the piezoelectric sensor and the tested insert.

[0044] In some other embodiments of this utility model, a strong adhesive is applied between the left locking piece 30 and the left side of the upper guide block 10 and the left side of the lower guide block 20, and a strong adhesive is applied between the right locking piece 40 and the right side of the upper guide block 10 and the right side of the lower guide block 20. The beneficial effects of adopting the above technical solution are: reducing the risk of loosening of the connection after long-term use, and ensuring the stability and reliability of the overall adapter structure.

[0045] like Figure 5 As shown, in some other embodiments of this utility model, the guide groove 12 openings of the upper guide block 10 and the lower guide block 20 are provided with outwardly expanding guide surfaces 14, and the included angle between the two opposing outwardly expanding guide surfaces 14 is 40°. The beneficial effect of adopting the above technical solution is that the outwardly expanding guide surface design at the guide groove opening plays a guiding role, making it easier for the tested contact piece to be quickly and accurately inserted into the guide groove, reducing the difficulty of alignment when inserting the piece, and improving the detection efficiency.

[0046] like Figure 8 , Figure 9 As shown, in some other embodiments of this utility model, the thickness of the piezoelectric part 91 at the front end of the piezoelectric sensor 90 is a mm, and the depth of the slot 92 at the root of the piezoelectric part 91 is 0.25 mm. Then, in the free state, the distance b between the protrusion 311 of the upper claw 31 and the protrusion 311 of the lower claw 32 is (a-0.4) mm.

[0047] like Figure 10As shown, in some other embodiments of this utility model, the thickness a of the piezoelectric part 91 at the front end of the piezoelectric sensor is 5mm. In the free state, the distance b between the protrusions of the upper claw 31 and the lower claw 32 is 4.6mm; the root thickness of the upper claw 31 and the lower claw 32 is 0.8mm; the distance from the root of the upper claw 31 and the lower claw 32 to the rear end face of the left locking piece 30 or the right locking piece 40 is 12.5mm; the opposing surfaces of the upper claw 31 and the lower claw 32 are inclined planes with an inclination of 1.25°. The beneficial effects of adopting the above technical solution are: through a large number of experimental tests, better dimensional data are obtained, ensuring that the insertion and extraction force between the adapter and the piezoelectric sensor is stably maintained at 7N while the insertion and extraction life is more than 90,000 times. It meets the requirements of the special testing standard IEC 60512-2-2 for electronic device connectors, the insertion and extraction force range of the connector is 7N-28N, and it has a long insertion and extraction life.

[0048] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A detection adapter for assisting a piezoelectric sensor, characterized in that, It includes an upper guide block, a lower guide block, a left locking piece, a right locking piece, an upper connecting pin, and a lower connecting pin; The upper guide block and the lower guide block are arranged vertically at intervals, with a spacing space between them for the piezoelectric sensor to pass through. The upper guide block and the lower guide block are mirror-symmetrically distributed. Each of the upper guide block and the lower guide block has a guide groove at the middle position in the left-right direction for the probe piece to be tested to pass through. The guide groove is perpendicular to the spacing space. The left locking piece is located to the left of the upper and lower guide blocks, and the right locking piece is located to the right of the upper and lower guide blocks. The upper parts of the left and right locking pieces are connected to the upper guide block via an upper connecting pin, and the lower parts of the left and right locking pieces are connected to the lower guide block via a lower connecting pin. The left and right locking pieces are mirror-symmetrically distributed. Both the left and right locking pieces have an opening facing the rear at the middle position in the vertical direction. The inner side of the opening is provided with an upper claw and a lower claw. The front ends of the upper claw and the lower claw are provided with opposing protrusions. The protrusions are used to engage with the slot at the root of the piezoelectric part at the front end of the piezoelectric sensor.

2. The detection adapter for an auxiliary piezoelectric sensor according to claim 1, characterized in that, The upper surface of the upper guide block has a slope that gradually slopes downwards from back to front, and the lower surface of the lower guide block has a slope that gradually slopes upwards from back to front. The front ends of the left and right locking pieces are pointed angles that gradually narrow from back to front.

3. The detection adapter for an auxiliary piezoelectric sensor according to claim 1, characterized in that, The upper guide block and the lower guide block are made of aluminum alloy.

4. The detection adapter for an auxiliary piezoelectric sensor according to claim 1, characterized in that, The left and right locking plates are made of stainless steel.

5. The detection adapter for an auxiliary piezoelectric sensor according to claim 4, characterized in that, The left and right locking plates are made of 17-4PH stainless steel.

6. The detection adapter for an auxiliary piezoelectric sensor according to claim 1, characterized in that, The left and right locking plates are provided with connecting holes for connecting to the upper and lower connecting pins, and the connecting holes are interference fit with the upper and lower connecting pins.

7. The detection adapter for an auxiliary piezoelectric sensor according to claim 6, characterized in that, A strong adhesive is applied between the left locking piece and the left side of the upper guide block and the left side of the lower guide block, and a strong adhesive is applied between the right locking piece and the right side of the upper guide block and the right side of the lower guide block.

8. The detection adapter for an auxiliary piezoelectric sensor according to claim 1, characterized in that, The guide slots of the upper guide block and the lower guide block are provided with outwardly expanding guide surfaces, and the included angle between the two opposing outwardly expanding guide surfaces is 40°.

9. The detection adapter for an auxiliary piezoelectric sensor according to claim 1, characterized in that, The thickness of the piezoelectric part at the front end of the piezoelectric sensor is a mm, and the groove depth at the root of the piezoelectric part is 0.25 mm. Then, in the free state, the distance between the protrusions of the upper jaw and the lower jaw is (a-0.4) mm.

10. The detection adapter for an auxiliary piezoelectric sensor according to claim 9, characterized in that, The thickness of the piezoelectric part at the front end of the piezoelectric sensor is 5mm. In the free state, the distance between the protrusions of the upper and lower jaws is 4.6mm. The thickness of the root of the upper and lower jaws is 0.8mm. The distance from the root of the upper and lower jaws to the rear end face of the left or right locking piece is 12.5mm. The opposite surfaces of the upper and lower jaws are inclined planes with an inclination of 1.25°.

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