A testing fixture for ceramic pressure sensor signal detection

Abstract

The present invention relates to a jig for detecting signals of a ceramic pressure sensor, comprising a base plate and a movable plate, wherein a slide bar mounting hole is respectively provided on the left and right sides of the base plate, a slide bar perpendicular to the base plate is installed in each slide bar mounting hole, a sleeve mounting hole is provided at a position corresponding to the slide bar mounting hole on the movable plate, a sleeve is installed in each sleeve mounting hole, the sleeve is sleeved on the slide bar and moves along the axial direction of the slide bar, a reset spring is sandwiched between the base plate and the movable plate on the slide bar, a positioning plate is installed at the middle of the top of the base plate, a detection head mounting hole is provided on the movable plate above the positioning groove, a detection head is installed in the detection head mounting hole, a terminal block is installed at the top of the movable plate, and the detection head is connected to the terminal block through a wire. The beneficial effects of the present invention are as follows: the jig has a simple structure and is easy to operate, and can be used to clamp and fix the ceramic pressure sensor when detecting the signal of the ceramic pressure sensor.

Description

Technical Field

[0001] The invention relates to the technical field of pressure sensor manufacturing, and in particular to a testing tool for ceramic pressure sensor signal detection. Background Art

[0002] The ceramic pressure sensor is mainly composed of three parts: ceramic ring, ceramic diaphragm and ceramic cover. The ceramic diaphragm is made of 95% AL2O3 ceramic as a sensitive elastic body. It is required to be flat, uniform and dense. Its thickness and effective radius depend on the design range. The ceramic ring is formed by high-temperature sintering using a hot die-casting process. High-temperature glass slurry is used between the ceramic diaphragm and the ceramic ring, and they are fired together through thick film printing and hot sintering technology to form a peripheral fixed force cup-shaped elastic body, that is, a rigid structure without creep should be formed in the peripheral fixed part of the ceramic. The circuit of the sensor is made on the upper surface of the ceramic diaphragm, that is, the bottom of the ceramic cup, using thick film technology. The circular groove at the bottom of the ceramic cover forms a certain gap between the cover and the diaphragm. The limiter can prevent the diaphragm from breaking due to excessive bending when overloaded, forming an anti-overload protection for the sensor.

[0003] After manufacturing, ceramic pressure sensors need to be tested for signals to ensure that they can accurately and effectively output sensing signals. Currently, signal detection of ceramic pressure sensors is mainly performed by workers holding them directly, which is labor-intensive and there is also the problem of inaccurate docking between the probe and the contact point. Therefore, a simple-structured and easy-to-operate inspection fixture is designed to mount and fix the ceramic pressure sensor during signal detection. Summary of the invention

[0004] The purpose of the present invention is to overcome the above problems existing in the prior art and to provide a ceramic pressure sensor signal detection fixture having the characteristics of simple structure and convenient operation.

[0005] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:

[0006] The tool is provided with a slide rod mounting hole on the left and right sides of the base plate, a slide rod perpendicular to the base plate is mounted in each of the slide rod mounting holes, a sleeve mounting hole is provided on the movable plate at a position corresponding to the slide rod mounting hole, a sleeve is mounted in each of the sleeve mounting holes, the sleeve is sleeved on the slide rod and moves axially along the slide rod, a return spring is sandwiched between the base plate and the movable plate on the slide rod, a positioning plate is installed in the middle part of the top end of the base plate, a semicircular positioning groove is provided on the front side of the positioning plate, a positioning protrusion protruding forward is provided in the middle part of the groove wall of the positioning groove, a detection head mounting hole is provided on the movable plate above the positioning groove, a detection head is mounted in the detection head mounting hole, a terminal block is installed on the top end of the movable plate, and the detection head is connected to the terminal block through a wire.

[0007] Wherein, a U-shaped block is installed at the bottom end of the movable plate, and when the movable block is pressed down to the lowest position, the positioning plate is just located in the opening of the U-shaped block.

[0008] Wherein, a screw hole is respectively provided on the left and right sides of the detection head mounting hole on the movable plate, and a limiting bolt is screwed into the screw hole, and a foot pad is pasted on the bottom end of the limiting bolt.

[0009] Among them, a screw rod perpendicular to it is also installed on one side of the base plate, a round hole is opened on the movable plate at a position corresponding to the screw rod, the top end of the screw rod passes through the round hole from bottom to top, and a hexagonal nut is screwed on the screw rod above the movable plate.

[0010] Wherein, the sliding rod is a solid cylinder.

[0011] The sliding sleeve is composed of a round tube with external threads and two round nuts, one of the two round nuts is located below the movable plate and the other is located above the movable plate. The bottom end of the round nut located below the movable plate is lower than the bottom end of the round tube, and the top end of the reset spring is sleeved in the round nut located below the movable plate.

[0012] The detection head is composed of an insulating block and four probes arranged in the same straight line, and the upper parts of the four probes are wrapped in the insulating block.

[0013] Wherein, two rectangular support blocks parallel to each other are fixedly connected to the bottom end of the bottom plate.

[0014] The beneficial effects of the present invention are as follows: the inspection fixture has a simple structure and is easy to operate, and can be used to clamp and fix the ceramic pressure sensor when detecting the signal of the ceramic pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0017] Figure 2 is an exploded view of an embodiment of the present invention;

[0018] Figure 3 is a schematic structural diagram of the bottom portion in an embodiment of the present invention;

[0019] Figure 4 is a schematic structural diagram of a movable plate in an embodiment of the present invention;

[0020] Figure 5 Schematic diagram of the connection structure of the slide rod, the slide sleeve and the return spring in the embodiment of the present invention;

[0021] Figure 6 is a schematic structural diagram of a positioning plate in an embodiment of the present invention;

[0022] Figure 7 Schematic diagram of the structure of the detection head in the embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0024] like Figures 1 to 7 As shown, a ceramic pressure sensor signal detection fixture comprises a base plate 1 and a movable plate 2. A slide bar mounting hole 101 is respectively provided on the left and right sides of the base plate 1. A slide bar 3 perpendicular to the base plate is installed in each slide bar mounting hole 101. A sleeve mounting hole 201 is provided at a position corresponding to the slide bar mounting hole 101 on the movable plate 2. A sleeve 4 is installed in each sleeve mounting hole 201. The sleeve 4 is sleeved on the slide bar 3 and moves axially along the slide bar 3. A reset spring 5 is sandwiched between the base plate 1 and the movable plate 2 on the slide bar 3. A positioning plate 6 is installed at the middle part of the top end of the base plate 1. A semicircular positioning groove 601 is provided on the front side of the positioning plate 6. A positioning protrusion 602 protruding forward is provided in the middle part of the groove wall of the positioning groove 601. A detection head mounting hole 203 is provided on the movable plate 2 above the positioning groove 601. A detection head 9 is installed in the detection head mounting hole 203. A terminal block 10 is installed at the top end of the movable plate 2. The detection head 9 is connected to the terminal block 10 through a wire 11.

[0025] A U-shaped block 7 is installed at the bottom end of the movable plate 2. When the movable block 2 is pressed down to the lowest position, the positioning plate 6 is just located in the opening of the U-shaped block 7. The U-shaped block 7 ensures that the detection head 9 can accurately contact the contact point on the ceramic pressure sensor to be tested.

[0026] The movable plate 2 is provided with a screw hole 204 on the left and right sides of the detection head mounting hole 203, and a limit bolt 12 is screwed in the screw hole 204. A foot pad is attached to the bottom end of the limit bolt 12. The limit bolt 2 is used to limit the minimum height of the movable plate 2 to fall.

[0027] A screw rod 13 perpendicular to the bottom plate 1 is also installed on one side of the bottom plate 1. A circular hole 202 is opened on the movable plate 2 at a position corresponding to the screw rod 13. The top end of the screw rod 13 passes through the circular hole 202 from bottom to top. A hexagonal nut 14 is screwed on the screw rod 13 above the movable plate 2. The screw rod 13 is used to prevent the movable plate 2 from bouncing upward and disengaging from the slide bar 3 when it is suddenly released.

[0028] The slide rod 3 is a solid cylinder. The slide sleeve 4 is composed of a round tube 401 with external threads and two round nuts 402, one of the two round nuts 402 is located below the movable plate 2 and the other is located above the movable plate 2, the bottom end of the round nut 402 located below the movable plate 2 is lower than the bottom end of the round tube 401, and the top end of the reset spring 3 is sleeved in the round nut 402 located below the movable plate 2.

[0029] The detection head 9 is composed of an insulating block 901 and four probes 902 arranged in a straight line. The upper parts of the four probes 902 are wrapped in the insulating block 901.

[0030] Two rectangular support blocks 15 parallel to each other are fixedly connected to the bottom end of the bottom plate 1 .

[0031] The terminal block 10 is connected to the signal detector through the wire 11. The signal detector includes a signal generator, a signal detector, an analog-to-digital converter, and a display. The input end of the analog-to-digital converter is connected to the output interface of the signal detector through the wire, the output end of the analog-to-digital converter is connected to the display through the wire, the input end of the signal detector is connected to the input terminal on the terminal block, and the output end of the signal generator is connected to the output terminal on the terminal block. The signal generator is controlled by a switch to send a detection signal. The detection signal passes through the wire, the terminal block, the wire, and the probe in sequence to reach the input contact point of the ceramic pressure sensor. The feedback signal of the ceramic pressure sensor starts from the output contact point on it and passes through the probe, the wire, the terminal block, and the wire in sequence to reach the input interface of the signal detector. The feedback signal is processed by the signal detector and the analog-to-digital converter and is finally displayed on the display.

[0032] Place the ceramic pressure sensor to be tested into the positioning groove 601, and make the groove on the side of the ceramic pressure sensor to be tested close to the contact point coincide with the positioning protrusion 602, press down the movable plate 2, so that the detection head 9 installed on the movable plate 2 contacts the contact point on the ceramic pressure sensor to be tested, and perform signal detection. After the detection is completed, release the movable plate 2, and the movable plate 2 rises and returns to the initial position under the action of the reset spring 5.

[0033] The inspection fixture has a simple structure and is easy to operate, and can be used to clamp and fix the ceramic pressure sensor when detecting the signal of the ceramic pressure sensor.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A ceramic pressure sensor signal detection fixture, characterized in that: The cam is provided with a plurality of holes for holding the movable plate, and a plurality of holes are provided on the movable plate to respectively connect the movable plate and the movable plate to the movable plate. ; A screw hole is respectively provided on the left and right sides of the detection head mounting hole of the movable plate, and a limit bolt is screwed in the screw hole, and a foot pad is pasted on the bottom end of the limit bolt; a screw rod perpendicular to it is also installed on one side of the base plate, and a circular hole is opened at a position corresponding to the screw rod on the movable plate, and the top end of the screw rod passes through the circular hole from bottom to top, and a hexagonal nut is screwed on the screw rod above the movable plate; the sliding rod is a solid cylinder; the sliding sleeve consists of a round tube with an external thread and two round nuts, one of the two round nuts is located below the movable plate and the other is located above the movable plate, the bottom end of the round nut located below the movable plate is lower than the bottom end of the round tube, and the top end of the reset spring is sleeved in the round nut located below the movable plate; the detection head consists of an insulating block and four probes arranged in the same straight line, and the upper parts of the four probes are wrapped in the insulating block; two rectangular support blocks parallel to each other are fixedly connected to the bottom end of the base plate.

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