CN119029640A - A gas sensor electrode batch heat treatment and automatic pairing device - Google Patents

Abstract

The present invention relates to the technical field of sensor gas-sensitive element production, and discloses a device for batch heat treatment and automatic pairing of gas-sensitive element electrodes. The present invention comprises: an aging box, wherein a retractable placement table is installed in the aging box, wherein a fixture assembly is arranged on the placement table, and the fixture assembly can perform batch heat treatment and resistance pairing on gas-sensitive element electrodes; the fixture assembly comprises a fixture base, wherein a circuit board is arranged on the fixture base, and the gas-sensitive element electrodes can be electrically aged and resistance paired in batches through the circuit board, and a substrate sheet is arranged above the circuit board, and the substrate sheet is used to serve as a carrier of the gas-sensitive element. The present invention can batch age and pair gas-sensitive element electrodes while reducing the probability of gas-sensitive element electrode pins detaching, thereby improving the production efficiency and yield rate of gas-sensitive elements.

Description

A gas sensor electrode batch heat treatment and automatic pairing device

Technical Field

The invention relates to the technical field of gas sensitive element production of sensors, and in particular to a batch heat treatment and automatic pairing device for gas sensitive element electrodes.

Background Art

During the production process of the gas sensitive element of the sensor, in order to improve the conductivity, stability and anti-interference ability of the gas sensitive element, the gas sensitive element needs to be placed in an atmosphere (mixed gas such as hydrogen, nitrogen, argon, air, etc.) for power-on aging. When powered on, the sensitive resistor will generate high temperature. Under this condition, placing it in the air for a period of time will improve the conductivity and stability of the gas sensitive element. The traditional treatment method is to place a single gas sensitive element in a heat treatment device, then inject gas, and perform power-on aging.

However, this method is not only inefficient and difficult to adapt to the needs of large-scale production, but also unable to monitor and record the resistance changes of each component during the aging process in real time, and thus unable to effectively pair the resistances, which in turn affects the review efficiency. In addition, when the existing aging device clamps the gas-sensitive components, the electrode pins often fall off due to improper pressing force, which not only increases production costs but also reduces the yield rate. Therefore, how to design a device that can perform heat treatment on gas-sensitive components in batches and pair resistors in batches to improve production efficiency while reducing the risk of electrode pins falling off has become a technical problem that needs to be solved urgently.

Summary of the invention

In order to solve the above technical problems, the present invention provides a gas sensor electrode batch heat treatment and automatic pairing device.

The present invention is implemented by the following technical scheme: an aging box, wherein a retractable placement table is installed in the aging box, and a fixture assembly is arranged on the placement table, and the fixture assembly can perform batch heat treatment on gas sensor electrodes and resistor pairing;

The fixture assembly includes a fixture base, on which a circuit board is arranged, through which the electrodes of the gas-sensitive elements can be electrically aged and resistance-matched in batches, a substrate sheet is arranged above the circuit board, and the substrate sheet is used to serve as a carrier of the gas-sensitive elements, and a fixture cover plate that can be raised and lowered and reset is arranged on the fixture base, and a spring probe pressure plate is arranged on the fixture cover plate, and the probe on the spring probe pressure plate can contact the substrate sheet in a soft contact manner.

As a further improvement of the above scheme, four rectangularly distributed positioning rods are arranged on the clamp base, the top ends of the four positioning rods all penetrate the clamp cover and are slidably connected to the clamp cover, the top ends of the four positioning rods are fixedly installed with the same top plate, and the four positioning rods are slidably sleeved with a second spring, and the two ends of the four second springs are respectively against the clamp base and the clamp cover, so that the clamp cover can drive the spring probe pressure plate to descend after being pressed, and can drive the spring probe pressure plate to rise and reset after losing the pressure.

As a further improvement of the above scheme, a top wheel is arranged on the top of the clamp cover plate, and the top wheel passes through the top plate and is slidably connected to the top plate. A trapezoidal stop block is arranged on the top inner wall of the aging box, so that when the clamp cover plate enters the aging box, the top wheel is squeezed by the trapezoidal stop block, which will drive the clamp cover plate and the spring probe pressure plate to descend and contact the substrate sheet.

As a further improvement of the above solution, a telescopic mechanism is provided at the bottom of the aging box, and the telescopic member of the telescopic mechanism is fixedly connected to the placement table, thereby driving the placement table and the fixture assembly to automatically enter and exit the aging box.

As a further improvement of the above scheme, two grooves are provided on the clamp base, and slide rails that can be raised and lowered and reset are provided in both grooves. The same limiting frame is slidably installed on the two slide rails, and the substrate sheet is placed in the limiting frame, and the limiting frame can limit the substrate sheet.

As a further improvement of the above solution, two axis frames are provided on the placement table, and shaft rods are rotatably provided on the two axis frames. Both shaft rods are fixedly connected to the clamp base, so that the clamp assembly can be tilted at a certain degree of angle on the placement table.

As a further improvement of the above scheme, a rail groove is provided on the bottom inner wall of the aging box, a first zone point and a second zone point are provided on the rail groove, and a retractable control rod is provided on the corresponding shaft rod, and the bottom end of the control rod extends into the rail groove and is slidably connected to the rail groove, so that the angle of the fixture assembly can be controlled by controlling the angle of the control rod.

As a further improvement of the above scheme, a fixing plate is slidably installed on the fixture cover, and the spring probe pressing plate is fixedly connected to the fixing plate, so that the spring probe pressing plate can be movably installed on the fixture cover, so that the spring probe pressing plate can press the substrate sheet covered with gas sensitive elements in a soft contact manner to avoid damage when it contacts the circuit board.

As a further improvement of the above scheme, a soft pad is provided at the bottom of the fixed plate, and the soft pad is located above the spring probe pressure plate and in contact with the spring probe pressure plate, so that even if the spring probe on the spring probe pressure plate has no elastic force, the soft pad can rely on its own elastic force to make the spring probe in soft contact with the substrate sheet.

As a further improvement of the above scheme, a connector is provided on the circuit board, a power plug connected to the connector is provided on the fixture base, and a power socket matching the power plug is provided on the aging box, so that the circuit board can be automatically powered on after the fixture assembly enters the aging box.

Compared with the prior art, the present invention has the following beneficial effects:

The fixture base, circuit board, fixture cover and spring probe pressure plate cooperate to form a fixture assembly that can perform batch aging and pairing of gas sensors. Compared with the traditional treatment method of aging and pairing only one gas sensor at a time, it can perform batch aging and pairing of gas sensors, which greatly improves the aging efficiency and avoids the errors that may occur in manual resistance testing, ensuring the production quality while improving the production efficiency;

At the same time, since the spring probe pressing plate and the fixture cover plate are in sliding connection, when the fixture cover plate drives the spring probe pressing plate to contact the substrate sheet covered with gas-sensitive elements, the substrate sheet can be pressed by the fixed plate and its own weight to contact the circuit board, and at the same time, the two will not be damaged due to hard contact. In addition, since the probe on the spring probe pressing plate adopts a spring probe, the contact mode between the probe and the substrate sheet is also soft contact, which makes it difficult for the pins of the gas-sensitive elements to fall off when the probe contacts the substrate sheet covered with gas-sensitive elements. Due to the overall double soft contact structural design, the gas-sensitive elements, circuit board, substrate sheet and the spring probe pressing plate itself can be protected to the greatest extent.

Through the coordination of the shaft rod, the control rod, and the rail groove, the clamp assembly can realize the automatic retraction and release operation of the substrate sheet through the limited frame when entering and exiting the aging box, so that the substrate sheet can be placed and taken out more conveniently during the aging treatment without too many tedious operations, thereby improving the processing efficiency of the entire gas sensor element, and the entry and exit of the clamp assembly and the retraction and release of the limited frame only need to be driven by a power source, which can reduce energy consumption to a certain extent.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a left-side perspective view of a device for batch heat treatment and automatic pairing of gas sensor electrodes according to the present invention;

FIG2 is a right-angle view of the gas sensor electrode batch heat treatment and automatic pairing device of the present invention;

FIG3 is a front cross-sectional view showing a device for batch heat treatment and automatic pairing of gas sensor electrodes according to the present invention;

FIG4 is a disassembled display diagram of the gas sensor electrode batch heat treatment and automatic pairing device of the present invention;

FIG5 is a front plan view of a fixture assembly in a device for batch heat treatment and automatic pairing of gas sensor electrodes according to the present invention;

FIG6 is a three-dimensional display diagram of the fixture assembly in the batch heat treatment and automatic pairing device for gas sensor electrodes of the present invention;

FIG7 is a disassembled display diagram of the fixture assembly in the batch heat treatment and automatic pairing device for gas sensor electrodes of the present invention;

FIG8 is a disassembled display diagram of the fixture base, the slide rail and the limiting frame;

FIG. 9 is a disassembled display diagram of the fixture cover plate and the spring probe pressure plate.

Description of main symbols:

1. Aging box; 2. Placement table; 3. Telescopic mechanism; 4. Fixture base; 5. Axis rod; 6. Circuit board; 7. Slide rail; 8. Slide rod; 9. First spring; 10. Limit frame; 11. Positioning rod; 12. Fixture cover; 13. Second spring; 14. Spring probe pressure plate; 15. Fixed plate; 16. Top wheel; 17. Top plate; 18. Control rod; 19. Track groove; 191. First zone point; 192. Second zone point; 20. Trapezoidal block; 21. Connector; 22. Power plug; 23. Power socket; 24. Substrate sheet; 25. Soft pad.

DETAILED DESCRIPTION

The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods.

Please refer to Figures 1 to 9, the batch heat treatment and automatic pairing device for gas-sensitive element electrodes includes: an aging box 1, an observation window is provided on the aging box 1, a retractable placement table 2 is installed in the aging box 1, both sides of the inner wall of the aging box 1 are provided with slide grooves, both sides of the placement table 2 are slidably connected with the two slide grooves, and the placement table 2 is composed of a bottom plate and a baffle, the baffle can block the aging box 1, so as to ensure the sealing of the aging box 1, at the same time, the top and one side of the aging box 1 are respectively provided with a gas injection port and an exhaust port, when the gas-sensitive element is subjected to aging treatment, gas is injected into the aging box 1 through the gas injection port, when the gas-sensitive element is aged, the exhaust gas in the aging box 1 is discharged through the exhaust port, and a fixture assembly is provided on the placement table 2, and the fixture assembly can perform batch heat treatment and resistor pairing on the gas-sensitive element electrodes;

The fixture assembly includes a fixture base 4, on which a circuit board 6 is arranged, and above the circuit board 6, a substrate sheet 24 is arranged. The substrate sheet 24 is used to serve as a carrier of the gas-sensitive element. The gas-sensitive element is actually composed of three parts: the substrate sheet 24, the electrode (the substrate is coated for electrical signal extraction), and the gas-sensitive element (the substrate is coated multiple times, and the resistance value will change with the gas concentration). The gas-sensitive element electrodes can be powered on and aged and paired in batches through the circuit board 6. When performing resistance pairing, the resistance value of the gas-sensitive element is calculated by detecting the current and the preset voltage. A fixture cover 12 that can be raised and lowered and reset is arranged on the fixture base 4, and a spring probe pressing plate 14 that can move up and down is arranged on the fixture cover 12, so that the spring probe pressing plate 14 can cooperate with the circuit board 6 to press the substrate sheet 24 covered with gas-sensitive elements in a soft contact manner, and also allow the probe to contact the substrate sheet 24 in a soft contact manner.

Four rectangularly distributed positioning rods 11 are provided on the clamp base 4, and the bottom ends of the positioning rods 11 are provided with threads, which are threadedly connected to the clamp base 4, and the top ends of the four positioning rods 11 all penetrate the clamp cover 12 and are slidably connected to the clamp cover 12, and the top ends of the four positioning rods 11 are fixedly installed with the same top plate 17, and the clamp cover 12 and the top plate 17 are provided with heat dissipation ports, and the four positioning rods 11 are slidably sleeved with a second spring 13, and the two ends of the four second springs 13 are respectively against the clamp base 4 and the clamp cover 12, so that the clamp cover 12 can drive the spring probe pressure plate 14 to descend after being pressed, and can drive the spring probe pressure plate 14 to rise and reset after losing the pressure.

A top wheel 16 is provided on the top of the fixture cover 12, and the top wheel 16 passes through the top plate 17 and is slidably connected to the top plate 17. A trapezoidal stop block 20 is provided on the top inner wall of the aging box 1, so that after the fixture cover 12 enters the aging box 1, the top wheel 16 is squeezed by the trapezoidal stop block 20 and drives the fixture cover 12 and the spring probe pressure plate 14 to descend and contact the substrate sheet 24.

Through the above technical solution, the fixture assembly can automatically press the substrate sheet 24 covered with gas-sensitive elements after entering the aging box 1, thereby reducing the use of power equipment, that is, reducing energy loss, and the entire structure is relatively simple, so the failure rate is relatively lower.

A telescopic mechanism 3 is provided at the bottom of the aging box 1, and the telescopic part of the telescopic mechanism 3 is fixedly connected to the placement table 2, so that the placement table 2 and the fixture assembly can be driven in and out of the aging box 1. The telescopic mechanism 3 includes an internal threaded tube, a screw threadedly installed in the internal threaded tube, and a motor for driving the internal threaded tube to rotate, and one end of the screw is fixedly connected to the placement table 2.

Two grooves are arranged on the fixture base 4, and slide rails 7 that can be raised and lowered and reset are arranged in the two grooves. The same limiting frame 10 is slidably installed on the two slide rails 7, so as to place and limit the substrate sheet 24 covered with gas-sensitive elements. The bottom inner walls of the two grooves are provided with a plurality of positioning grooves, and the bottoms of the two slide rails 7 are provided with a plurality of slide rods 8. The bottom ends of the plurality of slide rods 8 extend into the corresponding positioning grooves and are slidably connected with the corresponding positioning grooves. The plurality of slide rods 8 are sleeved with a first spring 9, and the two ends of the first spring 9 are respectively against the bottom inner wall of the groove and the bottom of the slide rail 7; two shaft frames are arranged on the placement table 2, and both shaft frames are provided with a plurality of positioning grooves. A shaft rod 5 is rotatably provided, and the two shaft rods 5 are fixedly connected to the fixture base 4, so that the fixture assembly can be tilted at a certain degree on the placement table 2; a rail groove 19 is provided on the bottom inner wall of the aging box 1, and a first zone point 191 and a second zone point 192 are provided on the rail groove 19, and a retractable control rod 18 is provided on the corresponding shaft rod 5, and the bottom end of the control rod 18 extends into the rail groove 19 and is slidably connected to the rail groove 19, so that the angle of the fixture assembly can be controlled by controlling the angle of the control rod 18, and the control rod 18 is composed of a sleeve, a telescopic rod, and a spring, so that the control rod 18 can always be in the rail groove 19 as the angle is adjusted.

Through the above technical solution, the clamp assembly can automatically complete the work of retracting and releasing the substrate sheet 24 when entering and exiting the aging box 1, so that when the gas sensor is subjected to aging treatment, it is more convenient to take and place the substrate sheet 24 used to carry the gas sensor, thereby saving time and improving efficiency to a certain extent. At the same time, the limiting frame 10 cooperates with the slide rail 7, so that the substrate sheet 24 placed on the limiting frame 10 can maintain a distance from the circuit board 6 when following the limiting frame 10 to be retracted and released, thereby avoiding damage to the pins. When the aging treatment is performed, the substrate sheet 24 can be pressed by the spring probe pressure plate 14 and then can be lowered and contacted with the circuit board 6.

A fixing plate 15 is slidably installed on the fixture cover 12, and the spring probe pressure plate 14 is fixedly connected to the fixing plate 15. The fixing plate 15 is connected to the fixture cover 12 by four bolts. It mainly serves as a connecting piece between the spring probe pressure plate 14 and the fixture cover 12, and also makes the downward pressing mode of the spring probe pressure plate 14 soft pressing, and because the probe on the spring probe pressure plate 14 is also an elastic probe, this makes the entire pressing mode double soft pressing, which can be pressed to better protect the substrate sheet 24 and its sensitive components thereon, and prevent the electrode pins from falling off.

A soft pad 25 is provided at the bottom of the fixed plate 15. The soft pad 25 is located above the spring probe pressing plate 14 and in contact with the spring probe pressing plate 14, so that even if the spring probe on the spring probe pressing plate 14 has no elastic force, the soft pad 25 can rely on its own elastic force to make the spring probe softly contact with the substrate sheet 24.

A connector 21 is provided on the circuit board 6, a power plug 22 connected to the connector 21 is provided on the fixture base 4, and a power socket 23 matching the power plug 22 is provided on the aging box 1, so that the circuit board 6 can be automatically powered on after the fixture assembly enters the aging box 1.

The implementation principle of a gas sensor electrode batch heat treatment and automatic pairing device in the embodiment of the present application is:

When it is necessary to process the gas-sensing element electrodes in batches, the telescopic mechanism 3 is started, and the telescopic mechanism 3 drives the fixture assembly to move through the placement table 2. The control rod 18 on the shaft rod 5 also moves synchronously on the track groove 19. When the fixture assembly is moved out of the aging box 1, the top wheel 16 is separated from the trapezoidal stop block 20. Under the push of the four second springs 13, the fixture cover 12 drives the spring probe pressure plate 14 to rise. At the same time, when the control rod 18 moves to the first zone point 191, the entire fixture assembly will be driven to lean back through the shaft rod 5, and when the control rod 18 moves to the second zone point 192, the entire fixture assembly will be driven to tilt forward through the shaft rod 5, so that when the fixture assembly is completely moved out of the aging box 1, the limiting frame 10 will slide out of the fixture assembly along the slide rail 7;

Subsequently, the substrate sheet 24 covered with gas-sensitive elements is placed on the limiting frame 10, and when the telescopic mechanism 3 drives the fixture assembly to retract and before the fixture assembly enters the aging box 1, the control rod 18 moves to the first zone point 191, and the entire fixture assembly will tilt backward, so that the limiting frame 10 automatically drives the substrate sheet 24 to slide back into the fixture assembly, and then, the fixture assembly enters the aging box 1 under the drive of the placement table 2, and after being squeezed by the trapezoidal stop block 20, the top wheel 16 drives the fixture cover 12 and the spring probe pressure plate 14 to descend, so that the spring probe pressure plate 14 presses the limiting frame 10 and the substrate sheet 24 on the limiting frame 10, so that the substrate sheet 24 contacts the circuit board 6, and at the same time, the spring probe on the spring probe pressure plate 14 will also contact the substrate sheet 24, so that the entire contact process is soft contact, which can better protect the gas-sensitive elements, that is, improve the aging pairing efficiency of the gas-sensitive elements, and at the same time ensure the yield rate.

The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims (10)

1. A gas sensor electrode batch heat treatment and automatic pairing device comprises: the device comprises an aging box (1), wherein a telescopic placing table (2) is arranged in the aging box (1), and is characterized in that a clamp assembly is arranged on the placing table (2), and the clamp assembly can perform batch heat treatment and resistance pairing on the gas sensor electrode;

The fixture assembly comprises a fixture base (4), a circuit board (6) is arranged on the fixture base (4), electrodes of the gas sensitive elements can be subjected to power-on aging and resistance pairing in batches through the circuit board (6), a substrate slice (24) is arranged above the circuit board (6), the substrate slice (24) is used as a carrier of the gas sensitive elements, a fixture cover plate (12) capable of being lifted and reset is arranged on the fixture base (4), a spring probe pressing plate (14) is arranged on the fixture cover plate (12), and probes on the spring probe pressing plate (14) can be in contact with the substrate slice (24) in a soft contact mode.

2. The batch heat treatment and automatic pairing device for the gas sensor electrodes according to claim 1, wherein four positioning rods (11) which are rectangular in distribution are arranged on the clamp base (4), the top ends of the four positioning rods (11) penetrate through the clamp cover plate (12) and are in sliding connection with the clamp cover plate (12), the same top plate (17) is fixedly arranged on the top ends of the four positioning rods (11), second springs (13) are sleeved on the four positioning rods (11) in a sliding manner, and two ends of the four second springs (13) are respectively abutted against the clamp base (4) and the clamp cover plate (12), so that the clamp cover plate (12) can drive the spring probe pressing plate (14) to descend after being pressed, and the spring probe pressing plate (14) can be driven to ascend and reset after being lost.

3. The batch heat treatment and automatic pairing device for the gas sensor electrodes according to claim 2, wherein a top wheel (16) is arranged at the top of the clamp cover plate (12), the top wheel (16) penetrates through the top plate (17) and is in sliding connection with the top plate (17), and a trapezoid supporting block (20) is arranged on the inner wall of the top of the aging box (1), so that when the clamp cover plate (12) enters the aging box (1), the top wheel (16) is extruded by the trapezoid supporting block (20) and then drives the clamp cover plate (12) and the spring probe pressing plate (14) to descend and contact with the substrate sheet (24).

4. The batch heat treatment and automatic pairing device for the gas sensor electrodes according to claim 1, wherein a telescopic mechanism (3) is arranged at the bottom of the aging box (1), and a telescopic piece of the telescopic mechanism (3) is fixedly connected with the placing table (2) so as to drive the placing table (2) and the clamp assembly to automatically enter and exit the aging box (1).

5. The batch heat treatment and automatic pairing device for the gas sensor electrodes according to claim 1, wherein two grooves are formed in the clamp base (4), lifting and resetting sliding rails (7) are arranged in the two grooves, the same limiting frame (10) is slidably arranged on the two sliding rails (7), the substrate sheet (24) is placed in the limiting frame (10), and the limiting frame (10) can limit the substrate sheet (24).

6. The batch heat treatment and automatic pairing device for the gas sensor electrodes according to claim 1, wherein two shaft brackets are arranged on the placing table (2), shaft rods (5) are rotatably arranged on the two shaft brackets, and the two shaft rods (5) are fixedly connected with the clamp base (4), so that the clamp assembly can incline at an angle to a certain degree on the placing table (2).

7. The batch heat treatment and automatic pairing device for gas sensor electrodes according to claim 6, wherein a rail groove (19) is formed in the bottom inner wall of the aging box (1), a first zone point (191) and a second zone point (192) are formed in the rail groove (19), a telescopic control rod (18) is arranged on the corresponding shaft rod (5), and the bottom end of the control rod (18) extends into the rail groove (19) and is in sliding connection with the rail groove (19), so that the angle of the clamp assembly can be controlled by controlling the angle of the control rod (18).

8. The batch heat treatment and automatic pairing device for the gas sensor electrodes according to claim 1, characterized in that a fixed plate (15) is slidably installed on the fixture cover plate (12), and the spring probe pressing plate (14) is fixedly connected with the fixed plate (15), so that the spring probe pressing plate (14) is movably installed on the fixture cover plate (12), and the spring probe pressing plate (14) can press the substrate sheets (24) fully covered with the gas sensor in a soft contact manner, so that damage caused when the spring probe pressing plate is contacted with the circuit board (6) is avoided.

9. A gas sensor electrode batch heat treatment and automatic pairing device according to claim 8, characterized in that the bottom of the fixing plate (15) is provided with a soft pad plate (25), the soft pad plate (25) is located above the spring probe pressing plate (14) and is in contact with the spring probe pressing plate (14), so that the soft pad plate (25) can make soft contact with the substrate sheet (24) by virtue of the self elastic force even if the spring probe on the spring probe pressing plate (14) has no elastic force.

10. The batch heat treatment and automatic pairing device for the gas sensor electrodes according to claim 1, characterized in that a connector (21) is arranged on the circuit board (6), an energizing plug (22) connected with the connector (21) is arranged on the fixture base (4), and an energizing socket (23) matched with the energizing plug (22) is arranged on the aging box (1), so that the fixture assembly can automatically energize the circuit board (6) after entering the aging box (1).