A gas sensor test fixture

Abstract

The present invention discloses a gas sensor test fixture, which includes a fixture body, a test probe module, and a sensor heating tabletop. The fixture body is fixedly connected to the sensor heating tabletop through a buckle and a positioning post; the test probe module is fixed inside the fixture body and is welded by a vertical probe and a ceramic plate. A spring is installed at the top of the probe module to contact the fixture body, and the end of the probe is connected to a test device through a wire. The present invention ensures the close contact between the probe and the sensor to be tested, and improves the efficiency and reliability of the performance test of the gas sensor.

Description

Technical Field

[0001] The present invention relates to the field of jigs, and particularly to a gas sensor test jig. Background Art

[0002] Gas sensors can be used for real-time monitoring and safety alarms of the concentrations of flammable, explosive, toxic gases, and various gaseous indicators, and are widely used in fields such as environmental monitoring, industrial production, military security, medical and health, and energy. The response sensitivity, response-recovery speed, selectivity, etc. of gas sensors to the gas to be measured are the key indicators for judging their quality. With the development of related fields, higher requirements have been put forward for the measurement accuracy, accuracy, and temperature and humidity stability of sensors.

[0003] In order to design gas sensors that meet the requirements, scientific research personnel need to test the performance of gas sensors, and in this process, they must rely on a scientific research device, namely a gas sensor test jig. At present, the clamping process of most gas sensor test jigs is troublesome and they cannot be used in high-temperature environments. Summary of the Invention

[0004] The purpose of the present invention is to provide a gas sensor test jig to solve the problem of complex clamping during the performance test of gas sensors. This jig can not only achieve rapid clamping of gas sensors, but also be used in a high-temperature environment of 500°C, improving the test efficiency while also increasing the applicable test environment temperature.

[0005] To achieve the above purpose, the technical solution provided by the present invention is:

[0006] A gas sensor test jig includes a jig body, a test probe module, and a sensor heating tabletop, and the jig body, the test probe module, and the sensor heating tabletop are fixedly connected through a buckle and a positioning post;

[0007] The jig body includes a pressing block, a U-shaped block, a jig outer frame, a floating plate, a positioning post, and a first ceramic plate; the U-shaped block is arranged inside the jig outer frame, the bottom of the U-shaped block is the floating plate, the pressing block is placed on the upper surface of the U-shaped block and keeps in contact with the upper surface of the U-shaped block, the sensor heating tabletop is arranged below the floating plate, and the first ceramic plate is placed in the square sunken area in the middle of the floating plate;

[0008] The test probe module is placed inside the U-shaped block and includes a vertical probe, a second ceramic plate, and a spring. The second ceramic plate is placed inside the U-shaped block, the spring is installed between the second ceramic plate and the inner wall of the pressing block, the vertical probe is installed on the second ceramic plate, and the end of the probe is connected to the test equipment through a wire;

[0009] The U-shaped block is fixedly connected to the floating plate; the U-shaped block is fixedly connected to the fixture outer frame through positioning posts; the positioning posts are divided into five cylinders with different diameters from top to bottom: the first cylinder, the second cylinder, the third cylinder, the fourth cylinder and the fifth cylinder; a large spring is sleeved on the first cylinder; a small spring is sleeved on the second cylinder section; a thread is provided at the top of the first cylinder; a nut is connected to the top of the first cylinder through the thread, so that the U-shaped block is fixed on the fixture outer frame.

[0010] The fixture outer frame is provided with a plurality of through holes with a ⊥-shaped longitudinal section, the sensor heating table is provided with a plurality of through holes with a T-shaped longitudinal section, and the floating plate is provided with a plurality of circular through holes; the first ceramic plate and the second ceramic plate are both provided with a plurality of circular through holes; the through holes with a T-shaped longitudinal section of the sensor heating table are connected to the first cylinder and the second cylinder, and the circular through holes of the floating plate, the second ceramic plate and the first ceramic plate are connected to the third cylinder; the fixture outer frame is provided with through holes with a ⊥-shaped longitudinal section connected to the fourth cylinder and the fifth cylinder.

[0011] Further, a lead screw is provided on the fixture outer frame, the upper end of the lead screw is a screwing block, and a pin is installed on the screwing block; the upper end of the lead screw is connected to the screwing block through the pin, and the lower end is connected to the pressing block through a bearing.

[0012] Further, the fixture body is placed on the sensor heating table, the upper part of the buckle is connected to the fixture body through a buckle spring, and the lower part of the buckle is fixedly connected to the sensor heating table.

[0013] As a preferred solution, a plurality of circular probe through holes with a diameter larger than the diameter of the vertical probe are provided on the first ceramic plate and the second ceramic plate.

[0014] Further, the first ceramic plate, the second ceramic plate and the positioning posts are made of alumina ceramic material.

[0015] A circular groove is provided on the second ceramic plate, a spring is placed in the circular groove, and the top of the spring contacts the U-shaped block; when the vertical probe contacts the pin of the gas sensor and moves upward for a certain distance, the spring is compressed, and the elastic force acts on the second ceramic plate to ensure that the tip of the probe contacts the pin tightly.

[0016] Further, the vertical probe and the second ceramic plate are connected by welding.

[0017] Further, the U-shaped block is connected to the floating plate by screws; four U-shaped blocks are symmetrically arranged.

[0018] As a preferred solution, a gas sensor chip placement slot and a long strip-shaped airway are provided in the middle area of the heating table. While fixing the chip, the placement slot has the characteristics of being convenient for placing and taking, and the long strip-shaped airway ensures the gas flow during testing.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The gas sensor test fixture of the present invention realizes the quick clamping of the gas sensor through the buckle structure, improving the test efficiency of the gas sensor; each component of the gas sensor test fixture of the present invention is matched through the positioning holes and positioning posts, ensuring the accuracy of the contact between the probe and the chip pins of the gas sensor.

[0021] The gas sensor test fixture of the present invention adopts a multi-layer plate structure and ceramic materials, reducing the conduction of the temperature on the upper surface of the heating table, increasing the service life of the spring component, and ensuring the reliability of the fixture.

[0022] The gas sensor test fixture of the present invention has quick clamping, accurate contact between the probe and the pin, high reliability, and can be used in high-temperature environments, having good application value and popularization significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional external view of the present invention.

[0024] Figure 2 is a front view of the positioning post.

[0025] Figure 3 is a three-dimensional external view of the sensor heating table surface.

[0026] Figure 4 is a schematic structural diagram of the probe module.

[0027] Figure 5 is a three-dimensional external view of the ceramic plate 17.

[0028] Figure 6 is a three-dimensional external view of the U-shaped block.

[0029] Figure 7 is a three-dimensional external view of the ceramic plate 19.

[0030] Figure 8 is a three-dimensional external view of the floating plate.

[0031] Figure 9 is a three-dimensional top view of the fixture outer frame.

[0032] Figure 10 Three-dimensional external view of the fixture body and the probe module.

[0033] In the figure: 1 - buckle, 2 - buckle spring, 3 - nut, 4 - turning block, 5 - bolt, 6 - lead screw, 7 - pressing block, 8 - U-shaped block, 9 - fixture outer frame, 10 - large spring, 11 - sensor heating tabletop, 12 - floating plate, 13 - small spring, 14 - screw rod, 15 - positioning post, 16 - vertical probe, 17 - second ceramic plate, 18 - spring, 19 - first ceramic plate, 15-1 - first cylinder, 15-2 - second cylinder, 15-3, third cylinder, 15-4 - fourth cylinder, 15-5 - fifth cylinder, 11-1 - through hole with a T-shaped longitudinal section, 11-2 - sensor heating area, 11-3 - card seat. Detailed implementation manners

[0034] The above content of the present invention will be further described in detail below in the form of embodiments. However, it should not be understood that the scope of the above subject matter of the present invention is limited to the following embodiments. All technologies implemented based on the above content of the present invention belong to the scope of the present invention.

[0035] The present invention provides a gas sensor test fixture, including a fixture body, a test probe module, and a sensor heating tabletop 11; the fixture body is placed on the sensor heating tabletop and is fixedly connected to the sensor heating tabletop through a buckle 1 and a positioning post 15; the test probe module is fixed inside the test fixture and is formed by welding a vertical probe 16 and a ceramic plate. A spring is installed at the top of the probe module to contact the test fixture, and the end of the probe is connected to a test device through a wire.

[0036] Among them, the fixture body includes a pressing block 7, a U-shaped block 8, a fixture outer frame 9, a floating plate 12, a positioning post 15, and a first ceramic plate 19; the U-shaped block 8 is arranged inside the fixture outer frame 9, the bottom of the U-shaped block 8 is a floating plate 12, and the sensor heating tabletop 11 is arranged below the floating plate 12; as Figure 7 、 8 shown, the first ceramic plate 19 is placed in the square sunken area in the middle of the floating plate 12;

[0037] The test probe module is placed inside the U-shaped block 8 and includes a vertical probe 16, a second ceramic plate 17, and a spring 18. The second ceramic plate 17 is placed inside the U-shaped block 8, the spring 18 is installed between the second ceramic plate 17 and the inner wall of the pressing block 7, and the vertical probe 16 is installed on the second ceramic plate 17;

[0038] The U-shaped block 8 is fixedly connected to the floating plate 12; the fixture outer frame 9 is provided with a plurality of through holes with a ⊥-shaped longitudinal section, the sensor heating tabletop 11 is provided with a plurality of through holes with a T-shaped longitudinal section, and the floating plate 12 is provided with a plurality of circular through holes; both the first ceramic plate 19 and the second ceramic plate 17 are provided with a plurality of circular through holes;

[0039] The U-shaped block 8 is fixedly connected to the floating plate 12; the U-shaped block 8 is fixedly connected to the fixture outer frame 9 through a positioning post; the positioning post is divided into five cylinders with different diameters from top to bottom: the first cylinder 15-1, the second cylinder 15-2, the third cylinder 15-3, the fourth cylinder 15-4, and the fifth cylinder 15-5; a thread is provided at the top of the first cylinder 15-1; the nut 3 is connected to the top of the first cylinder 15-1 through the thread, so that the U-shaped block is fixed on the fixture outer frame 9;

[0040] The large spring 10 is sleeved on the first cylinder 15-1; the small spring 13 is sleeved on the second cylinder 15-2; the longitudinal section of the sensor heating table 11 is a T-shaped through hole and is connected to the first cylinder 15-1 and the second cylinder 15-2, and the circular through holes of the floating plate 12, the second ceramic plate 17, and the first ceramic plate 19 are connected to the third cylinder 15-3; the fixture outer frame 9 is provided with a longitudinal section of a ⊥-shaped through hole and is connected to the fourth cylinder 15-4 and the fifth cylinder 15-5.

[0041] A lead screw 6 is provided on the fixture outer frame 9, the upper end of the lead screw 6 is a screwing block 4, and a pin 5 is installed on the screwing block 4; the upper end of the lead screw 6 is connected to the screwing block 4 through the pin 5, and the lower end is connected to the pressing block 7 through a bearing.

[0042] The fixture body is placed on the sensor heating table 11 and is fixedly connected to the sensor heating table 11 through a buckle and a positioning post; the upper part of the buckle 1 is connected to the fixture body through a buckle spring 2, and the lower part of the buckle 1 is fixedly connected to the sensor heating table 11.

[0043] The sensor heating table 11 is provided with a longitudinal section of a T-shaped through hole 11-1, the middle part of the sensor heating table 11 is a sensor heating area 11-2, and card seats 11-3 for cooperating with the buckle are provided on both sides of the sensor heating area 11-2.

[0044] A plurality of circular probe through holes with diameters larger than the diameter of the vertical probe are provided on the first ceramic plate 19 and the second ceramic plate 17. The circular probe through holes of the second ceramic plate 17 are used for welding with the probe, and the circular probe through holes of the first ceramic plate 19 are used for reducing the offset and buckling of the probe.

[0045] The first ceramic plate 19, the second ceramic plate 17, and the positioning post 15 are made of alumina ceramic material.

[0046] The vertical probe 16 and the second ceramic plate 17 are connected by welding.

[0047] The U-shaped block 8 is connected to the floating plate 12 by screws; four U-shaped blocks 8 are symmetrically arranged.

[0048] As Figure 3As shown in the figure, a gas sensor chip placement slot and a long strip-shaped air duct are provided in the middle area of the heating stage. The placement slot can not only fix the chip but also has the characteristics of being convenient for placing and taking. The long strip-shaped air duct ensures the gas flow during testing.

[0049] As Figure 10 shown in the figure, after the present invention is manufactured, the probe module is placed inside the fixture body. When it is used for the first time, only need to insert the positioning post into the T-shaped through hole in the longitudinal section of the heating stage, buckle the buckle, and turn the screw rod to adjust the probe to a suitable position to perform the performance test of the gas sensor; when it is used for the second time and each subsequent time, only need to insert the positioning post into the T-shaped through hole in the longitudinal section of the heating stage and buckle the buckle to perform the performance test of the gas sensor.

[0050] The present invention realizes the fixed connection between the fixture body and the sensor heating table through the buckle and the positioning post; the test probe module is fixed inside the fixture body and is welded by vertical probes and a ceramic plate. A spring is installed on the top of the probe module to contact the fixture body, and the end of the probe is connected to the test equipment through a wire.

[0051] The present invention realizes the quick clamping of the test fixture and the sensor heating table through the buckle, adjusts the height of the probe by using the screw rod, and the spring on the top of the probe module provides buffering for the probe, ensuring the close contact between the probe and the sensor to be tested, and improving the efficiency and reliability of the performance test of the gas sensor.

[0052] The present invention is easy to assemble, convenient to clamp, saves the working hours and processes required during testing, and improves the testing efficiency.

[0053] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Any person skilled in the relevant art, without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, any simple modification, equivalent replacement and improvement made to the above embodiments still fall within the protection scope of the technical solution of the present invention.

Claims

1. A gas sensor test fixture, characterized in that: It includes a fixture body, a test probe module, and a sensor heating tabletop (11). The fixture body, the test probe module, and the sensor heating tabletop (11) are fixedly connected by a snap fastener (1) and a positioning post (15). The fixture body includes a pressing block (7), a U-shaped block (8), a fixture outer frame (9), a floating plate (12), a positioning post (15), and a first ceramic plate (19). The U-shaped block (8) is arranged inside the fixture outer frame (9). The bottom of the U-shaped block (8) is the floating plate (12). The pressing block (7) is placed on the upper surface of the U-shaped block (8) and remains in contact with the upper surface of the U-shaped block (8). The sensor heating tabletop (11) is arranged below the floating plate (12). The first ceramic plate (19) is placed in the square sunken area in the middle of the floating plate (12). The test probe module is placed inside the U-shaped block (8) and includes a vertical probe (16), a second ceramic plate (17), and a spring (18). The second ceramic plate (17) is placed inside the U-shaped block (8). The spring (18) is installed between the second ceramic plate (17) and the inner wall of the pressing block (7). The vertical probe (16) is installed on the second ceramic plate (17). The end of the probe is connected to a test device through a wire. The U-shaped block (8) is fixedly connected to the floating plate (12). The U-shaped block (8) and the fixture outer frame (9) are fixedly connected by a positioning post. The positioning post (15) is divided into five cylinders with different diameters from top to bottom: a first cylinder (15-1), a second cylinder (15-2), a third cylinder (15-3), a fourth cylinder (15-4), and a fifth cylinder (15-5). A large spring (10) is sleeved on the first cylinder (15-1). A small spring (13) is sleeved on the second cylinder (15-2). A thread is provided at the top of the first cylinder (15-1). A nut (3) is connected to the top of the first cylinder (15-1) through the thread to fix the U-shaped block (8) on the fixture outer frame (9). The fixture outer frame (9) is provided with a plurality of through holes with a vertical cross-section in the shape of ⊥. The sensor heating tabletop (11) is provided with a plurality of through holes with a vertical cross-section in the shape of T. The floating plate (12) is provided with a plurality of circular through holes. The first ceramic plate (19) and the second ceramic plate (17) are both provided with a plurality of circular through holes. The through hole with a vertical cross-section in the shape of T on the sensor heating tabletop (11) is connected to the first cylinder (15-1) and the second cylinder (15-2). The circular through holes of the floating plate (12), the second ceramic plate (17), and the first ceramic plate (19) are connected to the third cylinder (15-3). The fixture outer frame (9) is provided with through holes with a vertical cross-section in the shape of ⊥ connected to the fourth cylinder (15-4) and the fifth cylinder (15-5).

2. The gas sensor test fixture according to claim 1, characterized in that: A lead screw (6) is provided on the fixture outer frame (9). The upper end of the lead screw (6) is a turning block (4). A pin (5) is installed on the turning block (4). The upper end of the lead screw (6) is connected to the turning block (4) through the pin (5), and the lower end is connected to the pressing block (7) through a bearing.

3. The gas sensor test fixture according to claim 1, characterized in that: The fixture body is placed on the sensor heating tabletop (11). The upper part of the buckle (1) is connected to the fixture body through a buckle spring (2), and the lower part of the buckle (1) is fixedly connected to the sensor heating tabletop (11).

4. The gas sensor test fixture according to claim 1, wherein: A number of circular probe through-holes with diameters larger than the diameter of the vertical probe are provided on the first ceramic plate (19) and the second ceramic plate (17).

5. The gas sensor test fixture according to claim 1, wherein: The first ceramic plate (19), the second ceramic plate (17), and the positioning post (15) are made of alumina ceramic material.

6. The gas sensor test fixture according to claim 1, characterized in that: The vertical probe (16) and the second ceramic plate (17) are connected by welding.

7. The gas sensor test fixture according to claim 1, wherein: A circular slot is provided on the second ceramic plate (17), and a spring (18) is placed in the circular slot. The top of the spring (18) contacts the U-shaped block (8). When the vertical probe (16) contacts the pins of the gas sensor and moves upward by a certain distance, the spring (18) is compressed, and the elastic force acts on the second ceramic plate (17) to ensure close contact between the probe tip and the pins.

8. The gas sensor test fixture according to claim 1, wherein: The U-shaped block (8) is connected to the floating plate (12) by screws; four U-shaped blocks (8) are symmetrically arranged.

9. The gas sensor test fixture according to claim 1, wherein: A gas sensor chip placement slot and a long strip-shaped air channel are provided in the middle area of the heating tabletop.

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