A spring contact finger simulation working condition testing device

Abstract

The application discloses a kind of spring contact finger simulation working condition testing device, including host unit, box, box door, insulating winding column, two pressurizing units and two end electrode unit;The pressurizing unit includes first electric telescopic rod and insulating bearing seat;The end electrode unit includes graphite bearing seat with semicylindrical recess, second electric telescopic rod, insulating lower pressing block, cylindrical graphite rod placed in semicylindrical recess, graphite electrode seat connected with graphite rod and graphite clamping seat fixed to graphite electrode seat;The box is installed with infrared temperature measuring unit capable of measuring the temperature of spring contact finger;The host unit is used to output adjustable current, and is used to collect voltage and current signal, and the host unit is electrically connected with two graphite bearing seats to form power supply loop.The testing device of the application can fatigue test the service working condition of spring contact finger.

Description

Technical Field

[0001] This invention relates to the field of spring contact fingers, and more specifically to a spring contact finger simulation working condition testing device. Background Technology

[0002] Gas-insulated metal-enclosed switchgear (GIS) is a core component of power systems. Spring contacts, as key electrical contact elements in critical parts such as GIS isolating / grounding switches, bear operating current for extended periods during normal operation and must withstand high-amplitude pulse current surges during operation. The performance of the spring contacts directly affects the contact resistance, temperature rise, and long-term operational stability of the equipment.

[0003] Currently, the evaluation of spring contacts mainly relies on two types of methods. One type is traditional material property testing, such as measuring the resistivity, hardness, and elastic modulus of alloys. While these methods can obtain the intrinsic parameters of the material, they cannot reflect the actual working state of the spring under its real helical structure, where electrical heating and contact conditions are coupled. The other type is mechanical life testing of the finished product, which typically uses simulated contacts to subject the spring to tens of thousands of insertion and removal operations to examine its mechanical fatigue performance. This type of method has a long testing cycle, high cost, and difficulty in simultaneously monitoring changes in the spring's electrothermal state during the test, thus failing to reveal the performance degradation process of the spring under the coupled effects of multiple factors including electricity, heat, and force.

[0004] Furthermore, existing testing methods isolate electrical performance testing, mechanical life assessment, and material failure analysis. Failure of spring contacts is often due to the cumulative effects of Joule heating from prolonged energization, frequent thermal cycling, and accidental short-circuit current surges, resulting in factors such as gradual increase in contact resistance, gradual decrease in elasticity, and aging of the material's microstructure. However, current technology lacks an effective method to comprehensively simulate the real-world service conditions of spring contacts and conduct performance evaluation under laboratory conditions, integrating these electrical, thermal, and mechanical factors. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art and provide a spring-touch finger simulation working condition testing device.

[0006] Technical Solution: A spring-touch finger simulation working condition testing device includes a main unit, a housing, a housing door, an insulating winding column that can be wound around the spring-touch finger, two pressurizing units, and two end electrode units. The pressurizing unit includes a first electric telescopic rod fixed to the housing and an insulating support connected to the first electric telescopic rod. The end electrode unit includes a graphite support with a semi-cylindrical groove, a second electric telescopic rod fixed to the housing, an insulating pressing block connected to the second electric telescopic rod, a cylindrical graphite rod placed in the semi-cylindrical groove, a graphite electrode seat connected to the graphite rod, and a graphite clamping seat fixed to the graphite electrode seat. An infrared temperature measuring unit capable of measuring the temperature of the spring-touch finger is installed in the housing. The main unit is used to output an adjustable current and to collect voltage and current signals. The main unit is electrically connected to the two graphite support seats to form a power supply circuit.

[0007] In some embodiments, the surface of the insulating winding post has a helical groove, and the spring contact finger can be wound around the helical groove.

[0008] Furthermore, the first electric telescopic rod has a servo driver.

[0009] Therefore, the servo driver is used to obtain the drive current of the servo motor, and can calculate the pressure applied by the insulating bearing seat to the spring contact finger based on the drive current.

[0010] Furthermore, the infrared temperature measurement unit has two units.

[0011] Furthermore, the insulating winding column is made of insulating ceramic.

[0012] Furthermore, the insulating pressure block is made of insulating ceramic.

[0013] Furthermore, it also includes two limiting units and two rotary drive units; the limiting unit includes a third electric telescopic rod installed on the housing, a slide connected to the third electric telescopic rod, and a limiting plate with a circular through hole connected to the slide; the graphite rod is fixed with an insulating counterweight, and the insulating counterweight is connected to an insulating abutment ring through a connecting spring; the graphite rod has a wire-passing channel, an insulating sleeve is fixed in the wire-passing channel, a voltage measuring wire is passed through the insulating sleeve, and the end of the voltage measuring wire has a conductive spring; the two voltage measuring wires are electrically connected to the main unit to form a voltage measuring circuit; the rotary drive unit includes a fourth electric telescopic rod installed on the housing, a lifting seat connected to the fourth electric telescopic rod, an active rotating roller, a supporting rotating roller, and an active rotating roller drive unit; an observation window is installed on the housing, and an image acquisition unit is installed at the observation window.

[0014] Furthermore, both the insulating counterweight and the insulating abutment ring are made of insulating ceramic.

[0015] Furthermore, the two voltage measurement lines are electrically connected to the host unit to form a voltage measurement circuit independent of the power supply circuit.

[0016] Furthermore, the host unit integrates a power supply module, a current measurement module, a voltage measurement module, and a control and data acquisition module.

[0017] Furthermore, the power supply module is a programmable DC current source and supports editing of pulse waveforms.

[0018] Specifically, the power supply module is connected to two graphite carriers via two first cables.

[0019] Furthermore, a precision shunt is connected in series inside the current measurement module. When current flows through the shunt, a millivolt-level voltage signal proportional to the current is generated, which is then converted into the actual current value by the internal signal conditioning circuit.

[0020] Furthermore, the voltage measurement module is connected to two voltage measurement lines via two second cables.

[0021] Furthermore, the control and data acquisition module incorporates a high-resolution data acquisition card. This acquisition card is clock-synchronized with the power supply module and can simultaneously acquire signals from both the current measurement module and the voltage measurement module.

[0022] Furthermore, it also includes a host computer interface, which is connected to an external computer via a USB or Ethernet interface.

[0023] Furthermore, the host computer software is used to set the current waveform, display data in real time, and generate resistance-temperature and resistance-time curves.

[0024] Furthermore, the active rotating roller drive unit includes a motor base mounted on the lifting seat, a drive motor mounted on the motor base, an active gear mounted on the drive motor, and a passive gear mounted on the rotating shaft of the active rotating roller, wherein the active gear meshes with the passive gear.

[0025] Furthermore, the graphite rod can be abutted by the active rotating roller and the supporting rotating roller and driven to rotate by the active rotating roller.

[0026] Furthermore, the conductive spring can abut against the end of the spring contact finger.

[0027] Furthermore, the graphite electrode holder is L-shaped.

[0028] Furthermore, the conductive spring cannot pass through the insulating sleeve.

[0029] Thus, the conductive spring always extends out of the insulating sleeve and can abut against the end of the spring contact finger.

[0030] Furthermore, the conductive spring includes a first planar portion, a first arcuate portion connected to the first planar portion, a second planar portion connected to the first arcuate portion, and a second arcuate portion connected to the second planar portion.

[0031] Furthermore, the insulating abutment ring can abut against the limiting plate.

[0032] Furthermore, the circular through hole can be pierced by a graphite rod.

[0033] Furthermore, two limiting slide rails are fixed at the bottom of the box, and the slide block has a limiting slide groove that cooperates with the limiting slide rails.

[0034] Furthermore, the graphite electrode holder and the graphite clamping holder are connected by graphite bolts. Both the graphite electrode holder and the graphite clamping holder have clamping grooves for clamping the end of the spring contact finger, and the end of the spring contact finger is clamped between the graphite electrode holder and the graphite clamping holder.

[0035] Furthermore, the clamping groove is arc-shaped.

[0036] Furthermore, the graphite support is fixedly connected to the bottom plate of the housing via an insulating bracket.

[0037] Furthermore, the insulating support has a receiving groove for accommodating the spring contact finger.

[0038] Furthermore, a pressure sensor is installed in the receiving groove of the insulating support.

[0039] This allows for a more direct and efficient acquisition of the pressure exerted by the insulating bearing seat on the spring contact finger, without the need for calculations.

[0040] Furthermore, the housing is connected to an air inlet pipe, an air outlet pipe, and an air extraction pipe. The air inlet pipe is connected to a protective gas supply unit, the air extraction pipe is connected to an air extraction pump, an air inlet valve is installed at the air inlet pipe, an air outlet valve is installed at the air outlet pipe, and an air extraction valve is installed at the air extraction pipe.

[0041] Furthermore, the enclosure includes a front panel, a back panel, two side panels, a top panel, and a bottom panel. The door is located on the front panel, and the infrared temperature measuring unit and the observation window are located on the back panel. A first electric telescopic rod is installed on the top panel and the bottom panel respectively. A second electric telescopic rod is installed on the top panel, a third electric telescopic rod is installed on the side panel, and a fourth electric telescopic rod is installed on the bottom panel.

[0042] Beneficial effects: Compared with the prior art, the present invention has the following advantages, 1) This invention clamps the spring with an insulating bearing seat and applies contact pressure, realistically replicating the force state of the spring's contact fingers. By directly powering the main unit, it utilizes Joule heating to simulate the service heating process, simultaneously acquiring temperature, current, and voltage signals across the spring, thus achieving a laboratory simulation of the electro-thermal-mechanical coupling condition. Specifically, the voltage measurement uses a measuring line independent of the power supply circuit that directly contacts both ends of the spring, eliminating contact resistance interference and ensuring the accuracy of dynamic resistance calculations.

[0043] 2) After the test, the spring can be cooled to room temperature under a continuously flowing protective atmosphere, avoiding changes in surface condition caused by high-temperature removal and preserving the failure characteristics completely. After cooling, the spring contact finger is rotated in place by a rotary drive mechanism, and the image acquisition unit completes the full surface scanning and imaging, realizing the integrated process of testing, cooling and observation, and providing a complete correspondence between test data and surface morphology for failure mechanism analysis. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the testing device; Figure 2 This is a schematic diagram of the test device without the spring contact finger in place. Figure 3 A schematic diagram showing the placement of the spring contact finger on the insulating support below; Figure 4 A schematic diagram showing the use of a graphite electrode holder and a graphite clamping holder to hold the end of a spring contact finger; Figure 5 A schematic diagram showing two insulating bearing seats applying pressure to the spring contact finger, with the insulating lower pressure block abutting against the lower pressure graphite rod; Figure 6 A schematic diagram of a rotary drive unit driving a spring-loaded finger to rotate. in, Figure 2-6 In the middle, the panel is not drawn to show the internal structure of the box; Figure label: 1.1 Front panel; 1.1.1 Cabinet door; 1.2 Back panel; 1.2.1 Infrared temperature measurement unit; 1.2.2 Observation window; 1.3 Top panel; 1.4 Side panels; 1.5 Bottom panel; 2.1 Inlet pipe; 2.2 Outlet pipe; 2.3 Extraction pipe; 3.1 First electric telescopic pole; 3.2 Insulated bearing base; 4. Insulating winding base; 5.1 Second electric telescopic rod; 5.2 Insulating pressure block; 6.1 Third electric telescopic rod; 6.2 Limiting slide rail; 6.3 Slide block; 6.4 Limiting plate; 7.1 Insulating bracket; 7.2 Graphite bearing seat; 7.3 Graphite rod; 7.4 Graphite electrode seat; 7.5 Graphite clamping seat; 7.6 Insulating counterweight; 7.7 Connecting spring; 7.8 Insulating abutment ring; 7.9 Insulating sleeve; 7.10 Voltage measuring wire; 7.11.1 First flat part; 7.11.2 First arcuate part; 7.11.3 Second flat part; 7.11.4 Second arcuate part; 8.1 Fourth electric telescopic rod; 8.2 Lifting seat; 8.3 Active rotating roller; 8.4 Supporting rotating roller; 8.5 Drive motor; 8.6 Drive gear; 8.7 Driven gear; 9. Spring-loaded finger. Detailed Implementation

[0045] The present invention will be further illustrated below with reference to specific embodiments. These embodiments are implemented based on the technical solutions of the present invention, and it should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0046] like Figure 1-6As shown, a spring-fed finger simulation working condition testing device includes a main unit, a housing, a housing door 1.1.1, an insulating winding column 4 that can be wound by a spring-fed finger 9, two pressurizing units, and two end electrode units; the pressurizing unit includes a first electric telescopic rod 3.1 fixed to the housing and an insulating support 3.2 connected to the first electric telescopic rod 3.1; the end electrode unit includes a graphite support 7.2 with a semi-cylindrical groove, a second electric telescopic rod 5.1 fixed to the housing, and an insulating support 3.2 connected to the second electric telescopic rod 9. The movable telescopic rod 5.1 is connected to an insulating pressure block 5.2, a cylindrical graphite rod 7.3 placed in a semi-cylindrical groove, a graphite electrode seat 7.4 connected to the graphite rod 7.3, and a graphite clamping seat 7.5 fixed to the graphite electrode seat 7.4; an infrared temperature measuring unit 1.2.1 capable of measuring the temperature of the spring contact finger 9 is installed in the housing; the main unit is used to output an adjustable current and to collect voltage and current signals, and the main unit is electrically connected to two graphite bearing seats 7.2 to form a power supply circuit. The testing device further includes two limiting units and two rotation drive units; the limiting unit includes a third electric telescopic rod 6.1 installed on the housing, a slide 6.3 connected to the third electric telescopic rod 6.1, and a limiting plate 6.4 with a circular through hole connected to the slide 6.3; the graphite rod 7.3 is fixed with an insulating counterweight 7.6, and the insulating counterweight 7.6 is connected to an insulating abutment ring 7.8 through a connecting spring 7.7; the graphite rod 7.3 has a wire threading channel, and an insulating sleeve 7.9 is fixed inside the wire threading channel. A voltage measuring line 7.10 is installed inside the 7.9, and the end of the voltage measuring line 7.10 has a conductive spring; two voltage measuring lines 7.10 are electrically connected to the main unit to form a voltage measuring circuit; the rotary drive unit includes a fourth electric telescopic rod 8.1 installed in the housing, a lifting seat 8.2 connected to the fourth electric telescopic rod 8.1, an active rotating roller 8.3, a supporting rotating roller 8.4, and an active rotating roller drive unit; an observation window 1.2.2 is installed in the housing, and an image acquisition unit is installed in the observation window 1.2.2.

[0047] The active rotating roller drive unit includes a motor mount mounted on the lifting seat 8.2, a drive motor 8.5 mounted on the motor mount, an active gear 8.6 mounted on the drive motor 8.5, and a passive gear 8.7 mounted on the rotating shaft of the active rotating roller 8.3. The active gear 8.6 meshes with the passive gear 8.7. The graphite rod 7.3 can be abutted by the active rotating roller 8.3 and the supporting rotating roller 8.4 and is driven to rotate by the active rotating roller 8.3. The conductive spring can abut the end of the spring contact finger 9. The conductive spring includes a first flat portion 7.11.1, a first arcuate portion 7.11.2 connected to the first flat portion 7.11.1, a second flat portion 7.11.3 connected to the first arcuate portion 7.11.2, and a second arcuate portion 7.11.4 connected to the second flat portion 7.11.3. Two limiting slide rails 6.2 are fixed at the bottom of the housing, and the slide block 6.3 has a limiting slide groove that cooperates with the limiting slide rails 6.2. The graphite electrode holder 7.4 and the graphite clamping holder 7.5 are connected by graphite bolts. Both the graphite electrode holder 7.4 and the graphite clamping holder 7.5 have clamping grooves for clamping the end of the spring contact finger 9, and the end of the spring contact finger 9 is clamped between the graphite electrode holder 7.4 and the graphite clamping holder 7.5. The graphite support 7.2 is fixedly connected to the bottom plate 1.5 of the housing through an insulating bracket 7.1; the insulating support 3.2 has a receiving groove for accommodating the spring contact finger 9. The housing is connected to an air inlet pipe 2.1, an air outlet pipe 2.2, and an air extraction pipe 2.3. The air inlet pipe 2.1 is connected to a protective gas supply unit, the air extraction pipe 2.3 is connected to an air extraction pump, an air inlet valve is installed at the air inlet pipe 2.1, an air outlet valve is installed at the air outlet pipe 2.2, and an air extraction valve is installed at the air extraction pipe 2.3. The enclosure includes a front panel 1.1, a back panel 1.2, two side panels 1.4, a top panel 1.3, and a bottom panel 1.5. The enclosure door 1.1.1 is located on the front panel 1.1, and the infrared temperature measuring unit 1.2.1 and the observation window 1.2.2 are located on the back panel 1.2. A first electric telescopic rod 3.1 is installed on the top panel 1.3 and the bottom panel 1.5 respectively. A second electric telescopic rod 5.1 is installed on the top panel 1.3, a third electric telescopic rod 6.1 is installed on the side panel 1.4, and a fourth electric telescopic rod 8.1 is installed on the bottom panel 1.5.

[0048] The specific testing process for this application is as follows: Before testing, the spring sample is cut open and wound along the spiral grooves on the surface of the insulating winding post to maintain its spiral shape. The two ends of the wound spring are placed into the graphite electrode holders. Under the action of the two connecting springs, the graphite rod can move along its length, allowing the conductive spring to abut against the end of the spring contact finger. Then, graphite bolts are used to machine and fix the graphite clamp and graphite electrode holder, thus securing the end of the spring contact finger. Next, the insulating pressure block is driven downwards, pressing against the graphite rod, thus establishing a tight electrical connection between the graphite rod and the graphite support.

[0049] After sample loading, close and seal the test chamber door. Turn on the protective atmosphere system and introduce high-purity argon or other protective gases into the chamber to reduce the oxygen content below the set value. Start the test after setting the current loading program via the host computer software. The main unit outputs current to the graphite base according to the program, causing the spring to generate Joule heat after being energized, simulating its service heating process. During the test, pressure can be applied to the spring contacts through the two insulating support seats, simulating the stress conditions of the spring contacts during actual use. During the test, the main unit simultaneously acquires the circuit current, the voltage across the spring, and the spring surface temperature signal measured by an infrared thermometer. It can also acquire the pressure signal applied by the insulating support seats to the spring contacts, and the host computer software calculates the dynamic resistance in real time according to Ohm's law, generating a resistance curve as a function of temperature, time, or pressure.

[0050] After the test, the power supply was disconnected. The spring was cooled to room temperature under a protective atmosphere to prevent contact with air at high temperatures from altering its surface condition. After cooling, as follows... Figure 6 As shown, the limiting plate moves horizontally, so that the insulating abutment ring does not contact the limiting plate, the two insulating bearing seats are moved away from the spring contact finger, and the lifting seat rises. The active rotating roller and the support rotating roller at the two lifting seats can abut against the two graphite rods, so that the spring contact finger can rotate under the drive of the active rotating roller. It can rotate more than one revolution. At the same time, the image acquisition unit is used to acquire images of it, and the entire outer circumference surface of the spring contact finger is scanned and photographed to obtain its surface morphology image.

[0051] After image acquisition is complete, the protective atmosphere system is turned off, the chamber door is opened, the spring sample is taken out for subsequent microscopic analysis, and all components are put back in their original positions.

[0052] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A spring contact finger simulated working condition testing device, characterized in that, The device includes a main unit, a housing, a door, an insulating winding column that can be wound around a spring-loaded finger, two pressurizing units, and two end electrode units. The pressurizing unit includes a first electrically operated telescopic rod fixed to the housing and an insulating support connected to the first electric telescopic rod. The end electrode unit includes a graphite support with a semi-cylindrical groove, a second electrically operated telescopic rod fixed to the housing, an insulating pressing block connected to the second electric telescopic rod, a cylindrical graphite rod placed in the semi-cylindrical groove, a graphite electrode seat connected to the graphite rod, and a graphite clamping seat fixed to the graphite electrode seat. An infrared temperature measuring unit capable of measuring the temperature of the spring-loaded finger is installed in the housing. The main unit is used to output an adjustable current and to collect voltage and current signals. The main unit is electrically connected to the two graphite support seats to form a power supply circuit.

2. The spring finger simulated working condition testing device according to claim 1, wherein, It also includes two limiting units and two rotary drive units; the limiting unit includes a third electric telescopic rod installed on the housing, a slide connected to the third electric telescopic rod, and a limiting plate with a circular through hole connected to the slide; the graphite rod is fixed with an insulating counterweight, and the insulating counterweight is connected to an insulating abutment ring through a connecting spring; the graphite rod has a wire-passing channel, an insulating sleeve is fixed in the wire-passing channel, a voltage measuring wire is passed through the insulating sleeve, and the end of the voltage measuring wire has a conductive spring; the two voltage measuring wires are electrically connected to the main unit to form a voltage measuring circuit; the rotary drive unit includes a fourth electric telescopic rod installed on the housing, a lifting seat connected to the fourth electric telescopic rod, an active rotating roller, a supporting rotating roller, and an active rotating roller drive unit; an observation window is installed on the housing, and an image acquisition unit is installed at the observation window.

3. The spring finger simulated working condition testing device of claim 2, wherein, The active rotating roller drive unit includes a motor base mounted on the lifting seat, a drive motor mounted on the motor base, an active gear mounted on the drive motor, and a passive gear mounted on the rotating shaft of the active rotating roller, wherein the active gear meshes with the passive gear.

4. The spring finger simulated working condition testing device of claim 2, wherein, The conductive spring includes a first planar portion, a first arcuate portion connected to the first planar portion, a second planar portion connected to the first arcuate portion, and a second arcuate portion connected to the second planar portion.

5. The spring-fingered finger simulation working condition testing device according to claim 2, characterized in that, The bottom of the box is fixed with two limiting slide rails, and the slide block has a limiting slide groove that cooperates with the limiting slide rails.

6. The spring-fingered finger simulation working condition testing device according to claim 2, characterized in that, The graphite electrode holder and the graphite clamping holder are connected by graphite bolts. Both the graphite electrode holder and the graphite clamping holder have clamping grooves for clamping the end of the spring contact finger. The end of the spring contact finger is clamped between the graphite electrode holder and the graphite clamping holder.

7. The spring-fingered finger simulation working condition testing device according to claim 2, characterized in that, The graphite support is fixedly connected to the bottom plate of the housing via an insulating bracket; the insulating support has a receiving groove for accommodating the spring contact finger.

8. The spring-fingered finger simulation working condition testing device according to claim 2, characterized in that, The housing is connected to an air inlet pipe, an air outlet pipe, and an air extraction pipe. The air inlet pipe is connected to a protective gas supply unit, the air extraction pipe is connected to an air extraction pump, an air inlet valve is installed at the air inlet pipe, an air outlet valve is installed at the air outlet pipe, and an air extraction valve is installed at the air extraction pipe.

9. The spring-fingered finger simulation working condition testing device according to claim 2, characterized in that, The enclosure includes a front panel, a back panel, two side panels, a top panel, and a bottom panel. The door is located on the front panel, and the infrared temperature measuring unit and the observation window are located on the back panel. A first electric telescopic rod is installed on the top panel and the bottom panel respectively. The second electric telescopic rod is installed on the top plate, the third electric telescopic rod is installed on the side plate, and the fourth electric telescopic rod is installed on the bottom plate.

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