PCBA calibration device for differential pressure sensor

Abstract

The utility model relates to the technical field of differential pressure transducer production, and aims to solve the technical problems of low efficiency, huge structure and complex wiring. In order to solve the technical problem, the utility model provides the PCBA calibration device for the differential pressure sensor. According to the utility model, a calibration frame body is provided with a plurality of shelves which are sequentially connected from top to bottom; the plurality of calibration jig assemblies are detachably connected to the shelf respectively; the ventilation hole is communicated with the ventilation channel and the first profiling groove, and the ventilation hole is in sealed connection with the air inlet side of a pressure chip in the PCBA to be calibrated through a sealing ring; the second profiling grooves in the bottom of the pressing plate correspond to the first profiling grooves in a one-to-one mode. The pressing plate is detachably connected to the bottom plate; the PCB is located above the pressing plate, and a plurality of probe groups are arranged on the PCB; the up-down lifting assembly drives the PCBs to move up and down synchronously so that the probe set can make contact with the contacts of the PCBA to be calibrated. The calibration efficiency is improved, the structure is compact, and wiring is simplified.

Description

A device for PCBA calibration of differential pressure sensors Technical Field

[0001] This utility model relates to the field of differential pressure sensor manufacturing technology, and in particular to a device for PCBA calibration of differential pressure sensors. Background Technology

[0002] Due to their physical characteristics, pressure sensors exhibit varying deformation under the same pressure at different temperatures. Therefore, calibrating the product within only one temperature range will result in deviations in output accuracy during actual use due to temperature variations. Consequently, during production, it is necessary to select several temperature points within the operating temperature range of the differential pressure sensor for calibration, thereby eliminating the influence of temperature.

[0003] Currently, differential pressure sensors on the market come in a wide variety of shapes. If the differential pressure sensor is calibrated and tested across the entire temperature range using finished products (including PCBA, housing, cover plate, etc.) during the production process, each type of differential pressure sensor requires a corresponding calibration fixture, resulting in excessive tooling requirements during production. In other words, different differential pressure sensors require different calibration fixtures for full-temperature range calibration and testing during mass production due to their different shapes. However, because the calibration and testing fixtures are large and heavy, this causes significant trouble for production changeovers and workshop positioning, leading to high costs.

[0004] Therefore, the same PCBA can be used with different differential pressure sensors, enabling PCBA calibration and unifying calibration fixtures, thus solving the problem of excessive calibration fixtures and tooling. Existing PCBA calibration devices suffer from low efficiency, bulky structure, and complex wiring. Therefore, there is a need to design a PCBA calibration device with a simple and compact structure, streamlined wiring, high efficiency, and the ability to calibrate PCBAs in large quantities. Summary of the Invention

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the above-mentioned problems existing in the prior art.

[0006] To solve the above-mentioned technical problems, this utility model provides a device for PCBA calibration of differential pressure sensors, comprising:

[0007] The calibration frame is equipped with multiple layers of shelves connected sequentially from top to bottom.

[0008] Multiple calibration fixture components are detachably connected to the shelf. Each calibration fixture component includes a fixture body and a PCB board. The fixture body includes a base plate and a pressure plate. The base plate has ventilation channels, multiple first contour slots for placing the PCBA to be calibrated, and multiple ventilation holes. The ventilation holes connect the ventilation channels and the first contour slots, and the ventilation holes are sealed to the air inlet side of the pressure chip in the PCBA to be calibrated through sealing rings. The bottom of the pressure plate has multiple second contour slots, which correspond one-to-one with the first contour slots. The pressure plate is detachably connected to the base plate. The PCB board is located above the pressure plate, and the PCB board has multiple sets of probes, which correspond one-to-one with the second contour slots.

[0009] The lifting assembly is connected to the calibration frame and multiple PCBs. The lifting assembly drives the multiple PCBs to move up and down synchronously so that the probe group makes contact with the contacts of the PCBA to be calibrated.

[0010] In one embodiment of the present invention, a plurality of upwardly protruding support columns are provided in the first contour groove; at least one support column is provided on each side of the vent along the diameter direction of the vent.

[0011] In one embodiment of the present invention, at least one upwardly protruding positioning post is provided in the first contour groove.

[0012] In one embodiment of this utility model, the first contouring groove includes a contouring groove body and a connecting groove; the PCBA to be calibrated is placed in the first contouring groove, the PCBA to be calibrated is erected on the contouring groove body and suspended above the connecting groove; multiple first contouring grooves are arranged in a matrix on the base plate; the connecting grooves of multiple first contouring grooves in the same column are interconnected.

[0013] In one embodiment of this utility model, the lifting assembly includes a power unit and a connector; the power unit is connected to the calibration frame, one end of the connector is connected to the output end of the power unit, and the PCB boards of multiple calibration fixture assemblies are connected sequentially through the connector.

[0014] In one embodiment of the present invention, the vertical lifting assembly further includes a plurality of first guide components, with at least one first guide component corresponding to the PCB board, so as to guide the vertical lifting of the PCB board.

[0015] In one embodiment of the present invention, the lifting assembly further includes a plurality of second guide components; the PCB board corresponds to at least one second guide component to guide the probe group through the pressure plate.

[0016] In one embodiment of this utility model, the shelf is provided with a slide groove, and the calibration fixture assembly is slidably connected in the slide groove.

[0017] In one embodiment of this utility model, a first limiting member is provided on the left and right sides of the slide groove in the shelf, and a second limiting member is provided on the back side of the slide groove in the shelf.

[0018] In one embodiment of this utility model, this application also includes an industrial control computer; the PCB board is provided with two interface terminals, which are connected to the industrial control computer through connector wire harnesses.

[0019] The above-mentioned technical solution of this utility model has the following advantages compared with the prior art:

[0020] The device for PCBA calibration of differential pressure sensors described in this invention utilizes multiple calibration fixture components to simultaneously calibrate multiple PCBAs to be calibrated, improving calibration efficiency and ensuring the consistency of calibration for a batch of PCBAs. The multiple calibration fixture components are arranged vertically, resulting in a compact structure. Since each calibration fixture component can calibrate multiple PCBAs, the wiring (i.e., the wiring connecting the probes to the industrial control computer) is integrated through the PCB board, thus simplifying the wiring. Furthermore, the multiple calibration fixture components are simultaneously pressed down by an up-and-down lifting assembly for calibration, improving both efficiency and accuracy. Attached Figure Description

[0021] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0022] Figure 1 is a schematic diagram of a device for PCBA calibration of a differential pressure sensor according to a preferred embodiment of the present invention;

[0023] Figure 2 is a schematic diagram of the connection between the shelf and the calibration fixture assembly in the device for PCBA calibration of the differential pressure sensor in Figure 2.

[0024] Figure 3 is a schematic diagram of the PCB board structure in the PCBA calibration device for the differential pressure sensor shown in Figure 1;

[0025] Figure 4 is a schematic diagram of the PCB board structure in the PCBA calibration device for the differential pressure sensor shown in Figure 1.

[0026] Figure 5 is a schematic diagram of the connection between the fixture body and the shelf in the PCBA calibration device for the differential pressure sensor shown in Figure 1.

[0027] Figure 6 is a schematic diagram of the fixture body on which the PCBA to be calibrated is placed in the device for PCBA calibration of the differential pressure sensor shown in Figure 1.

[0028] Figure 7 is a partial schematic diagram of Figure 6;

[0029] Figure 8 is a schematic diagram of the pressure plate in the PCBA calibration device for differential pressure sensors.

[0030] Explanation of reference numerals in the accompanying drawings: 100, calibration frame; 110, shelf; 111, slide rail; 112, base; 113, column;

[0031] 200. Calibration fixture assembly; 210. Fixture body; 211. Base plate; 2111. First contouring groove; 2112. Vent hole; 2113. Vent port; 2114. Support column; 2115. Positioning column; 2116. Contouring groove body; 2117. Connecting groove; 212. Pressure plate; 2121. Second contouring groove; 220. PCB board; 221. Probe assembly; 222. Interface terminal; 230. Sealing ring; 240. Handle; 250. First limiting member; 260. Second limiting member;

[0032] 300, PCBA to be calibrated; 310, round hole;

[0033] 400. Lifting and lowering assembly; 410. Power unit; 420. Connecting component; 430. Guide column; 440. Guide sleeve; 450. Guide component; 460. Guide hole. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0035] Referring to Figures 1 to 8, this embodiment of the present invention provides a device for PCBA calibration of a differential pressure sensor, comprising:

[0036] The calibration frame 100 is equipped with multiple shelves 110 connected vertically.

[0037] Multiple calibration fixture assemblies 200 are detachably connected to the shelf 110. Each calibration fixture assembly 200 includes a fixture body 210 and a PCB board 220. The fixture body 210 includes a base plate 211 and a pressure plate 212. The base plate 211 has ventilation channels, multiple first contouring grooves 2111 for placing the PCBA 300 to be calibrated, and multiple ventilation holes 2112. The ventilation holes 2112 are arranged one-to-one with the first contouring grooves 2111. The ventilation holes 2112 connect the ventilation channels and the first contouring grooves 2111, and the ventilation holes 2112 are sealed to the air inlet side of the pressure chip in the PCBA 300 to be calibrated through a sealing ring 230. In some embodiments, the base plate 211 is provided with at least one (e.g., two) vents 2113, which are connected to a gas supply device via PU gas tubes (not shown in the figure). One end of a gas supply channel is connected to the vent 2113, and the gas supply channel communicates with a plurality of vent holes 2112. The vent holes 2112 are correspondingly arranged and communicate with the first contouring grooves 2111. The gas supply device simultaneously supplies pressure to a plurality of pressure chips of PCBA300 to be calibrated. The bottom of the pressure plate 212 is provided with a plurality of second contouring grooves 2121 that match the PCBA300 to be calibrated, and the second contouring grooves 2121 are correspondingly arranged with the first contouring grooves 2111. The pressure plate 212 is detachably connected to the base plate 211. The PCB board 220 is located above the pressure plate 212, and the PCB board 220 is provided with a plurality of probe groups 221, which are correspondingly arranged with the second contouring grooves 2121.

[0038] A lifting assembly 400 is connected to the calibration frame 100 and multiple PCB boards 220. The lifting assembly 400 drives the multiple PCB boards 220 to move up and down synchronously, so that the probe group 221 passes through the first contouring groove 2111 and contacts the contacts of the PCBA 300 to be calibrated. In some embodiments, a probe group 221 includes three probes. The PCBA 300 to be calibrated has three contacts (VCC, GND, and VOUT interface contacts), and one probe contacts one contact.

[0039] Specifically, in this embodiment, multiple calibration fixture components 200 can simultaneously calibrate multiple PCBAs 300 to be calibrated, improving calibration efficiency and ensuring the uniformity of calibration for a unified batch of PCBAs 300 to be calibrated. The multiple calibration fixture components 200 are distributed vertically, resulting in a compact structure. Since each calibration fixture component 200 can calibrate multiple PCBAs 300 to be calibrated, the wiring is integrated through the PCB board 220 (i.e., the wiring connecting the probes to the industrial control computer), thus simplifying the wiring. Furthermore, the multiple calibration fixture components 200 are simultaneously pressed down by the lifting assembly 400 for calibration, improving efficiency. Additionally, all probe groups 221 are simultaneously aligned and in contact with the contacts of the PCBAs 300 to be calibrated, improving calibration accuracy.

[0040] Because the first contouring groove 2111 is uneven, when the PCBA 300 to be calibrated is placed in the first contouring groove 2111, it cannot be guaranteed that the bottom surface of the PCBA 300 to be calibrated will be in contact with the first contouring groove 2111. This may cause deformation or damage to the PCBA 300 to be calibrated when pressed down. To solve this problem, the first contouring groove 2111 is further provided with multiple upwardly protruding support pillars 2114; along the diameter direction of the vent hole 2112, at least one support pillar 2114 is provided on each side of the vent hole 2112. The support pillars 2114 support the original structural strength of the PCBA 300 to be calibrated, and will not cause damage to the pressure chip or other components on the PCBA 300 to be calibrated. In some embodiments, along the length direction of the PCBA 300 to be calibrated, at least one support pillar 2114 is provided on each side of the vent hole 2112. Specifically, in this embodiment, the support column 2114 supports the PCBA 300 to be calibrated, and when the pressure plate 212 is pressed down, it can be pressed down from both sides of the vent 2112, so that the sealing ring 230 is uniformly pressed down and deformed to seal. Since the support column 2114 supports the PCBA 300 to be calibrated during the pressing process, the bottom surface of the PCBA 300 to be calibrated does not need to be in complete contact with the first contour groove 2111, thereby avoiding deformation of the PCBA 300 to be calibrated.

[0041] Furthermore, the first contour groove 2111 is provided with at least one upwardly protruding positioning post 2115. The PCBA 300 to be calibrated already has a circular hole 310, and the positioning post 2115 mates with the circular hole 310. Therefore, in this embodiment, the positioning post 2115 is provided at the position corresponding to the circular hole 310. The mating of the positioning post 2115 and the circular hole 310 provides a positioning function when the PCBA 300 to be calibrated is placed in the first contour groove 2111, thereby ensuring that the contacts of the PCBA 300 to be calibrated are at the target position, allowing the probe and the contacts to be accurately aligned. In some embodiments, there are two positioning posts 2115, arranged diagonally.

[0042] Further, the first contouring groove 2111 includes a contouring groove body 2116 and a connecting groove 2117; the PCBA 300 to be calibrated is placed in the first contouring groove 2111, and the PCBA 300 to be calibrated is erected on the contouring groove body 2116 and suspended above the connecting groove 2117; a plurality of first contouring grooves 2111 are arranged in a matrix on the base plate 211; the connecting grooves 2117 of the plurality of first contouring grooves 2111 in the same column are interconnected. In some embodiments, the connecting groove 2117 is located in the middle part of the first contouring groove 2111. Specifically, in this embodiment, the connecting groove 2117 facilitates the placement and removal of the PCBA 300 to be calibrated in the first contouring groove 2111. In addition, the connecting groove 2117 can also reduce weight.

[0043] Furthermore, the lifting assembly 400 includes a power unit 410 and a connector 420; the power unit 410 is connected to the calibration frame 100, one end of the connector 420 is connected to the output end of the power unit 410, and the PCB boards 220 of multiple calibration fixture assemblies 200 are sequentially connected through the connector 420. In some embodiments, the power unit 410 is an elbow clamp. In some embodiments, two sets of power units 410 and connectors 420 are respectively provided. Specifically, the output shaft of the power unit 410 drives the connector 420 to lift up and down, thereby driving multiple PCB boards 220 to lift up and down synchronously.

[0044] Furthermore, the vertical lifting assembly 400 also includes multiple first guide components, with each PCB board 220 corresponding to at least one first guide component to guide the vertical lifting of the PCB board 220. In some embodiments, four first guide components are provided for each PCB board 220, and the four first guide components are located at the four corners of the PCB board 220. In some possible embodiments, the first guide component includes a guide post 430 and a guide sleeve 440. The guide post 430 is vertically arranged and connected between two adjacent shelves 110, and the guide sleeve 440 cooperates with the guide post 430 and is connected to the PCB board 220. Specifically, in this embodiment, the first guide component guides the vertical lifting of the PCB board 220, making its movement more stable.

[0045] Furthermore, the lifting assembly 400 also includes a plurality of second guide components; the PCB board 220 corresponds to at least one second guide component to guide the probe assembly 221 through the pressure plate 212. In some embodiments, a PCB board 220 is provided with two second guide components, which are arranged diagonally. In some possible embodiments, the second guide component includes a guide member 450 and a guide hole 460. The guide member 450 is connected to the bottom of the PCB board 220, and the guide hole 460 is provided on the pressure plate 212. The guide member 450 cooperates with the guide hole 460. The free end of the guide member 450 is provided with an arc-shaped or tapered guide portion. Specifically, in this embodiment, the probe assembly 221 can be guided by the second guide component when entering and exiting the pressure plate 212, thereby ensuring that after the probe assembly 221 passes through the pressure plate 212 and is aligned with the contact on the PCBA 300 to be calibrated, the probe can reliably contact the contact.

[0046] Furthermore, the shelf 110 is provided with a slide groove 111, in which the calibration fixture assembly 200 is slidably connected. In some embodiments, the shelf 110 includes a base 112 and a plurality of uprights 113, with the bases 112 of adjacent shelves 110 connected by the plurality of uprights 113; the slide groove 111 is disposed on the base 112. In some embodiments, the front end of the fixture body 210 of each calibration fixture assembly 200 is provided with a handle 240, which allows the calibration fixture assembly 200 to be inserted and removed in the slide groove 111 by holding the handle 240. Specifically, the cooperation between the calibration fixture assembly 200 and the slide groove 111 in this embodiment facilitates the quick installation or removal of the calibration fixture assembly 200 from the shelf 110.

[0047] Furthermore, the shelf 110 is provided with first limiting members 250 on the left and right sides of the slide groove 111, and a second limiting member 260 on the back side of the shelf 110 of the slide groove 111. Specifically, the first limiting members 250 can guide the jig body 210 to slide in the slide groove 111, preventing the jig body 210 from coming out of the left and right sides of the slide groove 111. The second limiting members 260 can limit the depth of the jig body 210 into the slide groove 111. On the one hand, it can identify whether the jig body 210 is installed in place by whether the jig body 210 hits the second limiting member 260; on the other hand, it can prevent the jig body 210 from coming out of the slide groove 111.

[0048] The pressure plate 212 is detachably connected to the base plate 211 by bolts.

[0049] Furthermore, this application also includes an industrial control computer (not shown in the figure); the PCB board 220 is provided with two interface terminals 222, which are connected to the industrial control computer through a connector harness (not shown in the figure). Specifically, in this embodiment, the industrial control computer can collect the calibration data of the PCBA 300 to be calibrated.

[0050] This application enables large-scale calibration and testing of PCBA300 to be calibrated through circuit integration, gas connection, and rapid installation of the PCBA300 to be calibrated.

[0051] In some embodiments, there are four calibration fixture assemblies 200, and each calibration fixture assembly 200 can hold 32 (4×8) PCBAs. This device can calibrate 128 (4×32) PCBAs at a time.

[0052] The calibration process is as follows:

[0053] Place the PCBA300 to be calibrated in the first contour groove 2111 of the calibration fixture assembly 200. After the PCBA300 to be calibrated is installed, tighten the pressure plate 212 with bolts so that the PCBA300 to be calibrated is pressed and sealed with the sealing ring 230.

[0054] After the PCBA300 is installed and calibrated, push the fixture body 210 onto the shelf 110. After the fixture body 210 is pushed into place, connect the connector harness and PU air tube to the interface terminal 222 and the air port 2113 respectively.

[0055] The power unit 410 is turned on, causing multiple PCB boards 220 and probe group 221 to be pressed down simultaneously, and the probes of probe group 221 make contact with the contacts of PCBA 300 to be calibrated.

[0056] The PCBA300 to be calibrated is controlled by the host computer software to perform full-temperature calibration.

[0057] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A device for calibrating a PCBA of a differential pressure sensor, characterized in that: include: The calibration frame comprises multiple layers connected vertically. Multiple calibration fixture assemblies are detachably connected to the layers. Each calibration fixture assembly includes a fixture body and a PCB board. The fixture body includes a base plate and a pressure plate. The base plate has ventilation channels, multiple first contour slots for placing the PCBA to be calibrated, and multiple ventilation holes. The ventilation holes connect the ventilation channels and the first contour slots, and are sealed to the pressure chip in the PCBA to be calibrated via sealing rings. The bottom of the pressure plate has multiple second contour slots, each corresponding to one of the first contour slots. The pressure plate is detachably connected to the base plate. The PCB board is positioned above the pressure plate. The PCB board has multiple sets of probes, each corresponding to one of the second contour slots. A lifting assembly is connected to the calibration frame and the multiple PCB boards, driving the multiple PCB boards to move synchronously up and down so that the probe sets contact the contacts of the PCBA to be calibrated.

2. The apparatus for PCBA calibration of a differential pressure sensor according to claim 1, characterized in that: The first contour groove is provided with multiple upwardly protruding support columns; along the diameter direction of the vent hole, at least one support column is provided on each side of the vent hole.

3. The apparatus for PCBA calibration of a differential pressure sensor according to claim 1, characterized in that: The first contour groove is provided with at least one positioning post that protrudes upward.

4. The apparatus for PCBA calibration of a differential pressure sensor according to claim 1, characterized in that: The first contouring groove includes a contouring groove body and a connecting groove; the PCBA to be calibrated is placed in the first contouring groove, the PCBA to be calibrated is erected on the contouring groove body and suspended above the connecting groove; multiple first contouring grooves are arranged in a matrix on the base plate; the connecting grooves of multiple first contouring grooves in the same column are interconnected.

5. The apparatus for PCBA calibration of a differential pressure sensor according to claim 1, characterized in that: The lifting assembly includes a power unit and a connector; the power unit is connected to the calibration frame, one end of the connector is connected to the output end of the power unit, and the PCB boards of multiple calibration fixture assemblies are connected sequentially through the connector.

6. The apparatus for PCBA calibration of a differential pressure sensor according to claim 1, characterized in that: The vertical lifting assembly also includes multiple first guide components, with at least one first guide component corresponding to the PCB board, to guide the vertical lifting of the PCB board.

7. The apparatus for PCBA calibration of a differential pressure sensor according to claim 1, characterized in that: The lifting assembly further includes multiple second guide components; the PCB board corresponds to at least one second guide component to guide the probe group through the pressure plate.

8. The apparatus for PCBA calibration of a differential pressure sensor according to claim 1, characterized in that: The shelf is provided with a sliding groove, and the calibration fixture assembly is slidably connected in the sliding groove.

9. The apparatus for PCBA calibration of a differential pressure sensor according to claim 8, characterized in that: The shelf is provided with a first limiting member at the left and right sides of the slide groove, and the shelf is provided with a second limiting member at the back side of the slide groove.

10. The apparatus for PCBA calibration of a differential pressure sensor according to claim 1, characterized in that: It also includes an industrial control computer; the PCB board is provided with two interface terminals, which are connected to the industrial control computer through connector wire harnesses.

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