Packaging testing apparatus for pressure sensor and control method

Abstract

A packaging testing apparatus for a pressure sensor, wherein a bottom of an upper mounting plate (1) is respectively connected to a pressing structure (3) and a transmission apparatus (5); one end of an edge-forming die (4) is connected to the pressing structure (3), and the other end of the edge-forming die (4) is located at a top of a pressure sensor (7); the pressure sensor (7) is connected to a pressure calibrator (6); a control apparatus controls the transmission apparatus (5) to move the pressing structure toward a lower mounting frame (2); a pressure value applied to a sealing ring (71) is then acquired, in real time, by means of a tension and compression sensor (36) of the pressing structure (3); when the pressure value reaches a predetermined pressure value, a position of the edge-forming die (4) is controlled to reach a predetermined edge-forming displacement, and the transmission apparatus (5) is then controlled to drive the pressing structure (3) to move a predetermined distance away from the lower mounting frame (2); and the pressure calibrator (6) is controlled to start and determine whether the pressure sensor (7) has reached a standard performance metric. The apparatus allows for packaging testing to be carried out after a pressure sensor edge-forming process, eliminating the need to use dedicated testing equipment, thereby improving testing efficiency. Further disclosed is a control method using the packaging testing apparatus.

Description

Packaging detection device and control method of pressure sensor

[0001] The present disclosure claims priority to the Chinese patent application No. 202411304145.0 filed on September 19, 2024, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of sensors, in particular to a packaging detection device and control method of a pressure sensor. BACKGROUND

[0003] A pressure sensor is a widely used sensing element in various industrial and technological fields, which mainly converts the pressure of gas or liquid into an electrical signal. In order to ensure that the pressure sensor chip can work stably in various environments and protect it from physical and chemical damage, the pressure sensor needs to be packaged. Among them, the sealing structure plays multiple roles in the packaging of the pressure sensor. It not only protects the pressure sensor from mechanical and environmental effects, but also maintains the accuracy and long-term stability of the pressure sensor.

[0004] The related packaging methods mainly include rolling edge pressing and extrusion forming. The rolling edge pressing completes the edge forming by internal pressing and external edge die under the condition that the object to be formed rotates. The extrusion forming sets an inner die and an outer die, and completes the edge forming by extruding the object to be formed by the die. The above two methods not only have certain limitations in the application of sensor packaging, but also can only complete the edge forming process simply, and cannot consider the overall forming demand of the sensor sealing structure, so as to realize the reliable packaging of the sensor. In addition, the packaged pressure sensor also needs to be replaced to the special detection equipment for separate performance detection, and cannot be detected immediately after the sensor packaging is completed, which leads to low detection efficiency and waste of manpower and resources. SUMMARY

[0005] The present application provides a packaging detection device and control method of a pressure sensor to solve the problem of unreliable pressure sensor packaging and low detection efficiency.

[0006] The first aspect of the present application provides a packaging detection device of a pressure sensor, comprising: an upper mounting plate, a lower mounting frame, a pressing structure, an edge pressing die, a transmission device, a pressure calibrator and a control device.

[0007] The bottom of the upper mounting plate is fixedly connected with the top of the pressing structure and the top of the transmission device respectively; one end of the land die is connected with the pressing structure, and the other end of the land die is located at the top of the pressure sensor; the bottom of the transmission device and the bottom of the pressure sensor are arranged on the lower mounting frame, the pressure sensor is connected with the pressure calibrator, and the control device is in communication connection with the pressing structure, the land die, the transmission device and the pressure calibrator respectively; the control device is configured to:

[0008] The transmission device is controlled through a preset pressing program, so that the upper mounting plate drives the pressing structure and the land die to move towards the lower mounting frame;

[0009] When the pressing plate of the pressing structure contacts the electric connector of the pressure sensor, the pressure value borne by the sealing ring of the pressure sensor is obtained in real time through the tension sensor of the pressing structure;

[0010] When the pressure value borne by the sealing ring reaches a preset pressure value, the land die is controlled to land on the pressure sensor;

[0011] When the land displacement of the land die reaches a preset land displacement, the transmission device is controlled through a preset lifting program, so that the upper mounting plate drives the pressing structure and the land die to move away from the lower mounting frame;

[0012] When the pressing structure is away from the pressure sensor by a preset distance, the transmission device is controlled to stop;

[0013] The pressure calibrator is controlled to start, so as to determine whether the performance index of the pressure sensor reaches a standard performance index;

[0014] If the performance index of the pressure sensor reaches the standard performance index, the pressure sensor is qualified;

[0015] If the performance index of the pressure sensor does not reach the standard performance index, the pressure sensor is unqualified.

[0016] The above device adopts a land forming sealing process. In the process of compressing the sealing ring in the pressure sensor, the pressure value obtained through the tension sensor is used to determine whether the preset pressure value is reached, thereby improving the reliability of the pressure sensor packaging. After the land sealing packaging process of the pressure sensor is completed, the performance of the pressure sensor is checked through the pressure calibrator, so as to determine whether the performance of the pressure sensor meets the standard. This integrated pressure sensor packaging detection device can not only determine the reliability of the packaging, but also quickly test the performance of the sensor, solving the problems of unreliable pressure sensor packaging and low detection efficiency.

[0017] Optionally, the pressing structure comprises an outer guide, an inner guide, a connecting plate, a pressing plate and a spring; the top of the outer guide is fixedly connected with the upper mounting plate through bolts, the inner guide is sleeved with the outer guide, and the bottom end of the inner guide is threadedly connected with one side of the connecting plate; the other side of the connecting plate is threadedly connected with one end of the tensile and compressive sensor; the other end of the tensile and compressive sensor is threadedly connected with the pressing plate; the spring is sleeved outside the inner guide and the outer guide; one end of the spring is connected with the edge pressing die, and the other end of the spring is connected with the connecting plate.

[0018] The outer guide and the inner guide not only increase the rigidity and stability of the whole structure, but also further ensure the accurate guidance of the whole structure. The spring is sleeved outside the inner guide and the outer guide, so that the whole pressing structure has a certain elasticity, and the slight irregularity of the pressure sensor can be adapted, and the potential damage to the pressure sensor is reduced.

[0019] Optionally, the transmission device comprises a lead screw nut, a lead screw, a bearing and a motor; the lead screw nut is arranged at the bottom of the upper mounting plate, the lead screw is arranged on the lower mounting frame, the lead screw nut and the lead screw are threadedly connected; one end of the lead screw away from the lead screw nut is fixedly connected with the bearing, the inner side of the bearing is sleeved on the lead screw, the outer side of the bearing is sleeved with the lower mounting frame, the motor is located at the bottom of the lower mounting frame, and the motor is connected with the lead screw.

[0020] The motor drives the lead screw, so that the lead screw nut moves up and down on the lead screw, high-precision position control can be realized, and the accuracy of movement is ensured; the inner side of the bearing is sleeved on the lead screw, and the outer side of the bearing is sleeved with the lower mounting frame, so that the double sleeving mode not only increases the stability of the structure, but also avoids direct friction between parts.

[0021] Optionally, the lower mounting frame has a rectangular frame structure in cross section; the motor is fixedly arranged in the rectangular frame through bolts, a bearing mounting hole is formed in the top of the lower mounting frame near one side of the motor, and the outer side of the bearing is sleeved with the bearing mounting hole; the pressure calibrator is fixedly arranged in the rectangular frame, the pressure calibrator is provided with a pressure outlet, the pressure sensor is provided with a pressure interface, and the pressure outlet and the pressure interface are in butt joint.

[0022] The rectangular frame structure has good bearing capacity, high rigidity and torsion resistance, can effectively disperse and bear the force from different directions, resist constraint torsion phenomenon and maintain the stability of the structure; the pressure calibrator and the motor are arranged in the rectangular frame, which can reduce the risk of failure caused by external environmental factors; the motor is fixed by bolts, which is convenient for installation and maintenance of the motor, can ensure the stability of the motor during high-speed operation and reduce the risk of part loosening caused by vibration; the bearing mounting hole is designed on the top of the lower mounting frame, so that the installation of the bearing is more accurate and stable, and the precision alignment and smooth operation of the lead screw transmission can be ensured; the pressure outlet and the pressure interface can conveniently connect the pressure sensor and the pressure calibrator, so that the whole measurement and calibration process is more convenient and accurate.

[0023] Optionally, the transmission device further comprises an inner guide column and an outer guide pipe, the inner guide column is arranged at the bottom of the upper mounting plate, and the outer guide pipe is arranged on the lower mounting frame, and the inner guide column is in sliding connection with the outer guide pipe.

[0024] Through cooperation of the inner guide column and the outer guide pipe, the inner guide column can slide in the outer guide pipe during the lead screw transmission, the linearity of movement is ensured, the precise alignment of the pressing structure and the edge pressing die is ensured, and the guiding and limiting effects are achieved; meanwhile, vibration and impact are effectively reduced, and the stability of the overall structure is improved.

[0025] Optionally, a linear variable differential transformer is fixedly connected to the pressing structure, the linear variable differential transformer is electrically connected with the control device; and the control device is further configured to:

[0026] when the pressing plate of the pressing structure contacts the electrical connector of the pressure sensor, the linear variable differential transformer is controlled to acquire the pressing displacement of the pressing structure in real time;

[0027] when the pressure value borne by the sealing ring reaches the preset pressure value, it is judged whether the pressing displacement of the pressing structure reaches the designed displacement;

[0028] if the pressing displacement of the pressing structure reaches the designed displacement, the edge pressing die is controlled to press the edge of the pressure sensor.

[0029] By controlling the linear variable differential transformer to acquire the pressing displacement of the pressing structure in real time, the situation that the sealing ring is excessively compressed or insufficiently compressed can be avoided, the accurate control of the pressing process is realized, the sealing ring reaches the appropriate compression rate, and the potential safety risk is reduced.

[0030] Optionally, the control device is further configured to:

[0031] controlling the pressure calibrator to set a standard pressure value according to the range and specification of the pressure sensor;

[0032] controlling the pressure calibrator to slowly apply pressure to the pressure sensor to the standard pressure value;

[0033] controlling the pressure sensor to collect an output pressure value;

[0034] comparing the standard pressure value and the output pressure value to obtain an accuracy error;

[0035] if the accuracy error meets the error requirement, determining that the performance index of the pressure sensor reaches the standard performance index;

[0036] if the accuracy error does not meet the error requirement, determining that the performance index of the pressure sensor does not reach the standard performance index.

[0037] By controlling the pressure calibrator to set a standard pressure value according to the range and specification of the pressure sensor, it can ensure that the starting point of the calibration process is accurate and consistent, and provide a reliable benchmark for subsequent accuracy error evaluation. By controlling the pressure calibrator to slowly apply pressure to the pressure sensor to the standard pressure value, it can ensure the smoothness of pressure change, avoid dynamic error caused by rapid change, and also help to discover the performance of the pressure sensor under gradually changing pressure, thereby ensuring the efficiency and reliability of the calibration and performance verification of the pressure sensor.

[0038] The second aspect of the application provides a control method of a packaging detection device of a pressure sensor, applied to the packaging detection device of the pressure sensor of the first aspect, and the method comprises:

[0039] controlling the transmission device through a preset pressing program to make the upper mounting plate drive the pressing structure and the edge pressing mold to move towards the lower mounting frame;

[0040] when the pressing plate of the pressing structure contacts the electrical connector of the pressure sensor, the pressure value borne by the sealing ring of the pressure sensor is obtained in real time through the tension sensor of the pressing structure;

[0041] when the pressure value borne by the sealing ring reaches a preset pressure value, the edge pressing mold is controlled to press the edge of the pressure sensor;

[0042] when the edge displacement of the edge pressing mold reaches a preset edge displacement, the transmission device is controlled through a preset lifting program to make the upper mounting plate drive the pressing structure and the edge pressing mold to move away from the lower mounting frame;

[0043] when the pressing structure is away from the pressure sensor by a preset distance, the transmission device is controlled to stop;

[0044] controlling the pressure calibrator to start to determine whether the performance index of the pressure sensor reaches a standard performance index;

[0045] if the performance index of the pressure sensor reaches the standard performance index, the pressure sensor passes the verification;

[0046] if the performance index of the pressure sensor does not reach the standard performance index, the pressure sensor fails the verification.

[0047] The method adopts a sealing process of the edge compression forming, and determines whether a preset pressure value is reached by the pressure value obtained by the pull-pressure sensor in the process of compressing the sealing ring in the pressure sensor, thereby improving the reliability of the packaging of the pressure sensor. After the edge compression sealing packaging process of the pressure sensor is completed, the performance of the pressure sensor is verified by the pressure calibrator to determine whether the performance of the pressure sensor meets the standard, which can not only determine the reliability of the packaging but also quickly test the performance of the sensor, thereby solving the problems of unreliable packaging of the pressure sensor and low detection efficiency.

[0048] Optionally, after the pressure value borne by the sealing ring of the pressure sensor is obtained by the pull-pressure sensor of the pressing structure, the method further comprises:

[0049] controlling the linear variable differential transformer to obtain the downward displacement of the pressing structure in real time when the pressing plate of the pressing structure contacts the electrical connector of the pressure sensor;

[0050] judging whether the downward displacement of the pressing structure reaches a designed displacement when the pressure value borne by the sealing ring reaches a preset pressure value;

[0051] controlling the edge die to press the edge of the pressure sensor if the downward displacement of the pressing structure reaches the designed displacement.

[0052] By controlling the linear variable differential transformer to obtain the downward displacement of the pressing structure in real time, the situation of excessive compression or insufficient compression of the sealing ring can be avoided, thereby realizing accurate control of the pressing process, ensuring that the sealing ring reaches an appropriate compression rate, and reducing potential safety risks.

[0053] Optionally, controlling the pressure calibrator to start to determine whether the performance index of the pressure sensor reaches a standard performance index comprises:

[0054] controlling the pressure calibrator to set a standard pressure value according to the range and specifications of the pressure sensor;

[0055] controlling the pressure calibrator to slowly press the pressure sensor to the standard pressure value;

[0056] controlling the pressure sensor to collect an output pressure value;

[0057] comparing the standard pressure value and the output pressure value to obtain a precision error;

[0058] if the precision error meets the error requirement, determining that the performance index of the pressure sensor reaches a standard performance index;

[0059] if the precision error does not meet the error requirement, determining that the performance index of the pressure sensor does not reach the standard performance index.

[0060] By controlling the pressure calibrator to set a standard pressure value according to the range and specifications of the pressure sensor, it can be ensured that the starting point of the calibration process is accurate and consistent, and a reliable benchmark is provided for subsequent precision error evaluation. By controlling the pressure calibrator to slowly pressurize the pressure sensor to the standard pressure value, it can be ensured that the pressure change is smooth, dynamic errors caused by rapid changes are avoided, and it is also helpful to discover the performance of the pressure sensor under gradually changing pressure, thereby ensuring the efficiency and reliability of the calibration and performance verification of the pressure sensor.

[0061] According to the technical scheme, the application provides a packaging detection device and a control method of a pressure sensor, the device comprises: an upper mounting plate, a lower mounting frame, a pressing structure, a pressing edge mold, a transmission device, a pressure calibrator and a control device; the bottom of the upper mounting plate is fixedly connected with the top of the pressing structure and the top of the transmission device; one end of the pressing edge mold is connected with the pressing structure, and the other end of the pressing edge mold is located at the top of the pressure sensor; the bottom of the transmission device and the bottom of the pressure sensor are arranged on the lower mounting frame, the pressure sensor is connected with the pressure calibrator, and the control device is in communication connection with the pressing structure, the pressing edge mold, the transmission device and the pressure calibrator; the control device controls the transmission device through a preset pressing program, so that the upper mounting plate drives the pressing structure and the pressing edge mold to move towards the lower mounting frame; when the pressing plate of the pressing structure contacts the electric connector of the pressure sensor, the pressure value borne by the sealing ring of the pressure sensor is acquired in real time through the pull pressure sensor of the pressing structure; when the pressure value borne by the sealing ring reaches a preset pressure value, the pressing edge mold is controlled to press the pressure sensor; when the pressing edge displacement of the pressing edge mold reaches a preset pressing edge displacement, the transmission device is controlled through a preset lifting program, so that the upper mounting plate drives the pressing structure and the pressing edge mold to move away from the lower mounting frame; when the pressing structure is away from the pressure sensor by a preset distance, the transmission device is controlled to stop; the pressure calibrator is controlled to start, so as to determine whether the performance index of the pressure sensor reaches a standard performance index; if the performance index of the pressure sensor reaches the standard performance index, the pressure sensor is qualified, and if the performance index of the pressure sensor does not reach the standard performance index, the pressure sensor is unqualified, so as to solve the problems of unreliable packaging of the pressure sensor and low detection efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0062] In order to more clearly illustrate the technical scheme of the application, the drawings needed in the embodiments will be briefly introduced as follows, and obviously, other drawings can be obtained by those skilled in the art without any creative effort on the premise of not paying any creative effort.

[0063] Fig. 1 is a front structure schematic view of the packaging detection device of the pressure sensor according to the embodiment of the application;

[0064] Fig. 2 is a left view of the packaging detection device of the pressure sensor according to the embodiment of the application;

[0065] Fig. 3 is a sectional view of the packaging detection device of the pressure sensor according to the embodiment of the application at A-A before starting packaging;

[0066] Fig. 4 is a cross-sectional view of the packaging detection device of the pressure sensor at time A-A when packaging is completed according to an embodiment of the present application;

[0067] Fig. 5 is a perspective view of the packaging detection device of the pressure sensor according to an embodiment of the present application;

[0068] Fig. 6 is a flowchart of a control method of the packaging detection device of the pressure sensor according to an embodiment of the present application;

[0069] Fig. 7 is a flowchart of a step of determining whether the performance index of the pressure sensor meets the standard performance index in the control method of the packaging detection device of the pressure sensor according to an embodiment of the present application.

[0070] Illustrations:

[0071] Wherein, 1 - upper mounting plate; 2 - lower mounting frame; 3 - compression structure; 31 - outer guide; 32 - inner guide; 33 - connecting plate; 34 - compression plate; 35 - spring; 36 - pressure sensor; 4 - edge compression mold; 5 - transmission device; 51 - lead screw; 52 - bearing; 53 - motor; 6 - pressure calibrator; 7 - pressure sensor; 71 - sealing ring. DETAILED DESCRIPTION

[0072] To solve the problem of unreliable packaging and low detection efficiency of the pressure sensor, referring to Figs. 1-5, some embodiments of the present application provide a packaging detection device of a pressure sensor, which comprises an upper mounting plate 1, a lower mounting frame 2, a compression structure 3, an edge compression mold 4, a transmission device 5, a pressure calibrator 6, and a control device. The bottom of the upper mounting plate 1 is fixedly connected with the top of the compression structure 3 and the top of the transmission device 5, respectively. One end of the edge compression mold 4 is connected with the compression structure 3, and the other end of the edge compression mold 4 is located at the top of the pressure sensor 7. The bottom of the transmission device 5 and the bottom of the pressure sensor 7 are arranged on the lower mounting frame 2. The pressure sensor 7 is connected with the pressure calibrator 6. The control device is communicatively connected with the compression structure 3, the edge compression mold 4, the transmission device 5, and the pressure calibrator 6, respectively. The control device is configured to:

[0073] The transmission device 5 is controlled by a preset compression program, so that the upper mounting plate 1 drives the compression structure 3 and the edge compression mold 4 to move towards the lower mounting frame 2;

[0074] When the compression plate 34 of the compression structure 3 contacts the electrical connector of the pressure sensor 7, the pressure value borne by the sealing ring 71 of the pressure sensor 7 is obtained in real time by the pressure sensor 36 of the compression structure 3;

[0075] When the pressure value borne by the sealing ring 71 reaches a preset pressure value, the edge compression mold 4 is controlled to compress the pressure sensor 7;

[0076] When the blank holder displacement of the blank holder die 4 reaches the preset blank holder displacement, the transmission device 5 is controlled through the preset lifting program, so that the upper mounting plate 1 drives the pressing structure 3 and the blank holder die 4 to move away from the lower mounting frame 2;

[0077] When the pressing structure 3 is away from the pressure sensor 7 by the preset distance, the transmission device 5 is controlled to stop;

[0078] The pressure calibrator 6 is controlled to start, so as to determine whether the performance index of the pressure sensor 7 reaches the standard performance index;

[0079] If the performance index of the pressure sensor 7 reaches the standard performance index, the pressure sensor 7 is qualified;

[0080] If the performance index of the pressure sensor 7 does not reach the standard performance index, the pressure sensor 7 is unqualified.

[0081] It should be understood that the control device can be a computer, which is an electronic computing machine for high-speed calculation, can perform numerical calculation and logical calculation, and has a storage memory function. In some embodiments, the control device is a computer with a display screen, which can display the data obtained from the tension sensor 36, the pressure sensor 7 and the pressure calibrator 6. The blank holder displacement of the blank holder die 4 can be fed back by an internal motor, and the preset blank holder displacement is determined by prior experiments according to the blank holder radius of the blank holder die 4 and the specifications of the pressure sensor 7.

[0082] The above device adopts a sealing process of blank holder forming. In the process of compressing the sealing ring 71 in the pressure sensor 7, whether the preset pressure value is reached is determined by the pressure value obtained by the tension sensor 36, so as to improve the reliability of the packaging of the pressure sensor 7. After the blank holder sealing packaging process of the pressure sensor 7 is completed, the performance of the pressure sensor 7 is verified by the pressure calibrator 6, so as to determine whether the performance of the pressure sensor 7 reaches the standard. This integrated packaging and detection device of the pressure sensor can not only determine the reliability of the packaging, but also quickly test the performance of the sensor, solving the problems of unreliable packaging and low detection efficiency of the pressure sensor 7.

[0083] In some embodiments, referring again to FIG. 3, the pressing structure 3 includes an outer guide 31, an inner guide 32, a connecting plate 33, a pressing plate 34 and a spring 35. The top of the outer guide 31 is fixedly connected to the upper mounting plate 1 by bolts. The inner guide 32 is sleeved with the outer guide 31, and the bottom end of the inner guide 32 is threadedly connected to one side of the connecting plate 33. The other side of the connecting plate 33 is threadedly connected to one end of the tension sensor 36. The other end of the tension sensor 36 is threadedly connected to the pressing plate 34. The spring 35 is sleeved outside the inner guide 32 and the outer guide 31. One end of the spring 35 is connected to the blank holder die 4, and the other end of the spring 35 is connected to the connecting plate 33.

[0084] It should be understood that the inner guide 32 and the outer guide 31 are slidably sleeved; the compression plate 34 is provided with a pull compression sensor 36 electrical connector, which can transmit the pressure signal of the pull compression sensor 36. One end of the spring 35 can be in contact with the edge compression mold 4; the other end of the spring 35 can also be in contact with the connecting plate 33; the outer guide 31 and the inner guide 32 are also provided with a limiting structure, which can make the spring 35 still in a compressed state in a natural state, so as to fix and limit the spring 35. The top of the outer guide 31 is provided with two clamping parts on both sides, which are clamped between the upper mounting plate 1 and the edge compression mold 4.

[0085] Through the outer guide 31 and the inner guide 32, not only the rigidity and stability of the whole structure are increased, but also the overall accurate guidance is further ensured. The spring 35 is sleeved outside the inner guide 32 and the outer guide 31, and the spring 35 can continuously provide extrusion force to the sealing ring 71 before the shell of the pressure sensor 7 is compressed, so that the sealing ring 71 remains in a compressed state. In some embodiments, referring again to FIG. 3, the transmission device 5 includes a lead screw nut, a lead screw 51, a bearing 52, and a motor 53; the lead screw nut is arranged at the bottom of the upper mounting plate 1, the lead screw 51 is arranged on the lower mounting frame 2, and the lead screw nut and the lead screw 51 are threadedly connected; the end of the lead screw 51 away from the lead screw nut is fixedly connected with the bearing 52, the inner side of the bearing 52 is sleeved on the lead screw 51, and the outer side of the bearing 52 is sleeved with the lower mounting frame 2; the motor 53 is located at the bottom of the lower mounting frame 2, and the motor 53 is connected with the lead screw 51.

[0086] It should be understood that the motor 53 can be connected with the lead screw 51 through a key or the like. The lead screw 51 is driven by the motor 53, so that the lead screw nut moves up and down on the lead screw 51, which can realize high-precision position control and ensure the accuracy of movement; the inner side of the bearing 52 is sleeved on the lead screw 51, and the outer side of the bearing 52 is sleeved with the lower mounting frame 2, which not only can increase the stability of the structure, but also can avoid direct friction between the parts.

[0087] In some embodiments, the cross section of the lower mounting frame 2 is a rectangular frame structure; the motor 53 is fixed in the rectangular frame; a bearing mounting hole is formed in the top of the lower mounting frame 2 near one side of the motor 53, and the outer side of the bearing 52 is sleeved with the bearing mounting hole; the pressure calibrator 6 is fixed in the rectangular frame, the pressure calibrator 6 is provided with a pressure outlet, the pressure sensor 7 is provided with a pressure interface, and the pressure outlet and the pressure interface are in butt joint.

[0088] The rectangular frame structure has good bearing capacity, high rigidity and torsion resistance, can effectively disperse and bear forces from different directions, resist constraint torsion phenomenon and maintain the stability of the structure; the pressure calibrator 6 and the motor 53 are arranged inside the rectangular frame, which can reduce the risk of failure caused by external environmental factors; the motor 53 is fixed by bolts, which not only facilitates the installation and maintenance of the motor 53, but also ensures the stability of the motor 53 during high-speed operation and reduces the risk of component loosening caused by vibration. A special bearing mounting hole is designed at the top of the lower mounting frame 2, so that the installation of the bearing 52 is more accurate and stable, and the transmission of the lead screw 51 can be accurately aligned and smoothly operated; the pressure outlet and the pressure interface can conveniently connect the pressure sensor 7 and the pressure calibrator 6, so that the whole measurement and calibration process is more convenient and accurate.

[0089] In some embodiments, the transmission device 5 further comprises an inner guide column and an outer guide tube, the inner guide column is arranged at the bottom of the upper mounting plate 1, and the outer guide tube is arranged on the lower mounting frame 2, and the inner guide column is in sliding connection with the outer guide tube.

[0090] It should be understood that the inner guide column and the outer guide tube are slidably sleeved, and the inner guide column can be fixed to the center of the bottom of the upper mounting plate 1; the outer guide tube can be fixed to the center of the top surface of the lower mounting frame 2. Through the cooperation of the inner guide column and the outer guide tube, the inner guide column can slide in the outer guide tube when the lead screw 51 is driven, ensuring the linearity of the movement, ensuring the accurate alignment of the pressing structure 3 and the edge pressing die 4, and playing a guiding and limiting role; at the same time, it also effectively reduces vibration and impact, and improves the stability of the overall structure.

[0091] In some embodiments, the packaging detection device of the pressure sensor can be disassembled and installed, and the specific installation sequence is as follows: first, the inner guide 32 is sleeved into the outer guide 31, the outer guide 31 is connected with the edge pressing die 4, then the spring 35 is sleeved outside the outer guide 31 and the inner guide 32, the connecting plate 33 is connected with the inner guide 32, then the tension and compression sensor 36 and the pressing plate 34 are connected, the edge pressing die 4 is fixedly connected with the upper mounting plate 1, one end of the lead screw 51 is connected with the bearing 52 in an interference fit, the other end of the lead screw 51 is screwed into the lead screw nut structure, and finally one end of the bearing 52 is placed into the bearing mounting hole, the motor 53 is connected from the lower side of the lower mounting frame 2, the inner guide column and the outer guide tube are connected, and the lower mounting frame 2 is fixedly connected with the pressure calibrator 6.

[0092] In some embodiments, the pressing structure 3 is fixedly connected with a linear variable differential transformer, and the linear variable differential transformer is electrically connected with a control device; the control device is further configured to:

[0093] When the pressing plate 34 of the pressing structure 3 contacts the electrical connector of the pressure sensor 7, the control linear variable differential transformer acquires the pressing displacement of the pressing structure 3 in real time;

[0094] When the pressure value borne by the sealing ring 71 reaches the preset pressure value, it is determined whether the downward displacement of the pressing structure 3 reaches the designed displacement;

[0095] If the downward displacement of the pressing structure 3 reaches the designed displacement, the blank holder die 4 is controlled to press the pressure sensor 7.

[0096] It should be understood that a linear variable differential transformer (LVDT) is a sensor for measuring linear displacement. The basic structure of an LVDT includes a primary coil and two secondary coils, which are wound around a coil holder tube usually made of non-magnetic material. Inside the three coils, there is a movable iron core that changes the magnetic flux through the secondary coils when the iron core moves within the coils, thereby changing the output voltage.

[0097] By controlling the linear variable differential transformer to obtain the downward displacement of the pressing structure 3 in real time, it is possible to avoid the situation of over-compression or under-compression of the sealing ring 71, thereby achieving precise control of the pressing process and ensuring that the sealing ring 71 reaches an appropriate compression rate, reducing potential safety risks.

[0098] In some embodiments, the control device is further configured to:

[0099] The pressure calibrator 6 is controlled to set a standard pressure value according to the range and specifications of the pressure sensor 7;

[0100] The pressure calibrator 6 is controlled to slowly press the pressure sensor 7 to the standard pressure value;

[0101] The pressure sensor 7 is controlled to collect the output pressure value;

[0102] The standard pressure value and the output pressure value are compared to obtain the accuracy error;

[0103] If the accuracy error meets the error requirement, it is determined that the performance index of the pressure sensor 7 reaches the standard performance index;

[0104] If the accuracy error does not meet the error requirement, it is determined that the performance index of the pressure sensor 7 does not reach the standard performance index.

[0105] It should be understood that the error requirement can be based on industry standards, for example, the Chinese Industrial Instrument Accuracy Grade is divided into 0.1, 0.2, 0.5, 1.0, 1.5, 2.5, 5.0, etc. In some embodiments, multiple standard pressure values can be set to obtain an average accuracy error, thereby improving the accuracy of determining the performance index of the pressure sensor 7.

[0106] By controlling the pressure calibrator 6 to set a standard pressure value according to the range and specifications of the pressure sensor 7, it can be ensured that the starting point of the calibration process is accurate and consistent, providing a reliable benchmark for subsequent accuracy error evaluation. By controlling the pressure calibrator 6 to slowly pressurize the pressure sensor 7 to the standard pressure value, it can be ensured that the pressure change is smooth, avoiding dynamic errors caused by rapid changes, and also helping to discover the performance of the pressure sensor 7 under gradually changing pressure, thereby ensuring the efficiency and reliability of the calibration and performance verification of the pressure sensor 7.

[0107] Some embodiments of the present application provide a control method for a packaging detection device of a pressure sensor, which is applied to the packaging detection device of the pressure sensor in the above embodiments. Referring to FIG. 6, the method comprises:

[0108] S100: Control the transmission device 5 through a preset pressing program, so that the upper mounting plate 1 drives the pressing structure 3 and the edge pressing mold 4 to move towards the lower mounting frame 2.

[0109] S200: When the pressing plate 34 of the pressing structure 3 contacts the electrical connector of the pressure sensor 7, the pressure value borne by the sealing ring 71 of the pressure sensor 7 is obtained in real time by the tension sensor 36 of the pressing structure 3.

[0110] S300: When the pressure value borne by the sealing ring 71 reaches a preset pressure value, control the edge pressing mold 4 to press the pressure sensor 7.

[0111] S400: When the edge displacement of the edge pressing mold 4 reaches a preset edge displacement, control the transmission device 5 through a preset lifting program, so that the upper mounting plate 1 drives the pressing structure 3 and the edge pressing mold 4 to move away from the lower mounting frame 2.

[0112] S500: When the pressing structure 3 moves away from the pressure sensor 7 by a preset distance, control the transmission device 5 to stop.

[0113] S600: Control the pressure calibrator 6 to start, to determine whether the performance index of the pressure sensor 7 reaches a standard performance index.

[0114] S700: If the performance index of the pressure sensor 7 reaches the standard performance index, the pressure sensor 7 is verified to be qualified;

[0115] S800: If the performance index of the pressure sensor 7 does not reach the standard performance index, the pressure sensor 7 is verified to be unqualified.

[0116] It should be understood that the preset compression program refers to a mode of operation preset in the computer control system for controlling the compression action of the equipment or machine. Such a preset compression program usually consists of a set of instructions, including parameters such as compression time and compression speed; similarly, the preset lifting program is used to control the lifting action of the equipment or machine. Such a preset lifting program usually consists of a set of instructions, including parameters such as lifting time and lifting speed. The preset pressure value can be set according to various factors such as the material and size of the sealing ring 71 and the required compression amount of the package.

[0117] The above method adopts a compression molding sealing process. In the process of compressing the sealing ring 71 in the pressure sensor 7, the pressure value obtained by the pull compression sensor 36 is used to determine whether the preset pressure value is reached, thereby improving the reliability of the packaging of the pressure sensor 7. After the compression molding sealing packaging process of the pressure sensor 7 is completed, the performance of the pressure sensor 7 is checked by the pressure calibrator 6 to determine whether the performance of the pressure sensor 7 meets the standard, which can not only determine the reliability of the packaging but also quickly test the performance of the sensor, solving the problem of unreliable packaging of the pressure sensor 7 and low detection efficiency.

[0118] In some embodiments, after the pressure value borne by the sealing ring 71 of the pressure sensor 7 is obtained by the pull compression sensor 36 of the compression structure 3, the method further comprises:

[0119] When the compression plate 34 of the compression structure 3 contacts the electrical connector of the pressure sensor 7, the linear variable differential transformer is controlled to obtain the downward displacement of the compression structure 3 in real time;

[0120] When the pressure value borne by the sealing ring 71 reaches the preset pressure value, it is determined whether the downward displacement of the compression structure 3 reaches the designed displacement;

[0121] If the downward displacement of the compression structure 3 reaches the designed displacement, the compression molding die 4 is controlled to compress the pressure sensor 7.

[0122] It should be noted that if the downward displacement of the compression structure 3 does not reach the designed displacement, the structure of the pressure sensor 7 may be stuck and the sealing ring 71 is not compressed in place, which may cause leakage at the sealing position and affect the performance of the pressure sensor 7. At this time, an alarm instruction can be issued, and the compression structure 3 is controlled to stop moving.

[0123] By controlling the linear variable differential transformer to obtain the downward displacement of the compression structure 3 in real time, the situation of excessive compression or insufficient compression of the sealing ring 71 can be avoided, thereby achieving precise control of the compression process and ensuring that the sealing ring 71 reaches an appropriate compression rate, reducing potential safety risks.

[0124] In some embodiments, referring to FIG. 7, the control pressure verifier 6 is activated to determine whether the performance index of the pressure sensor 7 meets the standard performance index, including:

[0125] S610: The control pressure verifier 6 sets a standard pressure value according to the range and specifications of the pressure sensor 7.

[0126] S620: The control pressure verifier 6 slowly applies pressure to the pressure sensor 7 to the standard pressure value.

[0127] S630: The control pressure sensor 7 collects the output pressure value.

[0128] S640: Compare the standard pressure value and the output pressure value to obtain the accuracy error.

[0129] S650: If the accuracy error meets the error requirement, it is determined that the performance index of the pressure sensor 7 meets the standard performance index.

[0130] S660: If the accuracy error does not meet the error requirement, it is determined that the performance index of the pressure sensor 7 does not meet the standard performance index.

[0131] By setting a standard pressure value according to the range and specifications of the pressure sensor 7 by the control pressure verifier 6, it can ensure that the starting point of the calibration process is accurate and consistent, and provide a reliable benchmark for subsequent accuracy error evaluation. By slowly applying pressure to the pressure sensor 7 to the standard pressure value by the control pressure verifier 6, it can ensure the smoothness of the pressure change, avoid dynamic errors caused by rapid changes, and also help to discover the performance of the pressure sensor 7 under gradually changing pressure, thereby ensuring the efficiency and reliability of the calibration and performance verification of the pressure sensor 7.

[0132] According to the technical scheme, the application provides a packaging detection device and a control method of a pressure sensor, the device comprises an upper mounting plate 1, a lower mounting frame 2, a pressing structure 3, a pressing edge die 4, a transmission device 5, a pressure calibrator 6 and a control device; the bottom of the upper mounting plate 1 is fixedly connected with the top of the pressing structure 3 and the top of the transmission device 5; one end of the pressing edge die 4 is connected with the pressing structure 3, and the other end of the pressing edge die 4 is located at the top of the pressure sensor 7; the bottom of the transmission device 5 and the bottom of the pressure sensor 7 are arranged on the lower mounting frame 2, the pressure sensor 7 is connected with the pressure calibrator 6, and the control device is in communication connection with the pressing structure 3, the pressing edge die 4, the transmission device 5 and the pressure calibrator 6; the control device controls the transmission device 5 through a preset pressing program, so that the upper mounting plate 1 drives the pressing structure 3 and the pressing edge die 4 to move towards the lower mounting frame 2; when the pressing plate 34 of the pressing structure 3 contacts the electric connector of the pressure sensor 7, the pressure value borne by the sealing ring 71 of the pressure sensor 7 is acquired in real time through the pull-and-press sensor 36 of the pressing structure 3; when the pressure value borne by the sealing ring 71 reaches a preset pressure value, the pressing edge die 4 is controlled to press the pressure sensor 7; when the pressing edge displacement of the pressing edge die 4 reaches a preset pressing edge displacement, the transmission device 5 is controlled through a preset lifting program, so that the upper mounting plate 1 drives the pressing structure 3 and the pressing edge die 4 to move away from the lower mounting frame 2; when the pressing structure 3 moves away from the pressure sensor 7 by a preset distance, the transmission device 5 is controlled to stop; the pressure calibrator 6 is controlled to start, so as to determine whether the performance index of the pressure sensor 7 reaches a standard performance index; if the performance index of the pressure sensor 7 reaches the standard performance index, the pressure sensor 7 is verified to be qualified, and if the performance index of the pressure sensor 7 does not reach the standard performance index, the pressure sensor 7 is verified to be unqualified, so as to solve the problems of unreliable packaging and low detection efficiency of the pressure sensor 7.

[0133] The similar parts among the embodiments provided in the application can be referred to each other, the specific embodiments provided above are only several examples under the general concept of the application, and do not limit the protection scope of the application. Any other embodiments extended according to the application scheme without creative labor belong to the protection scope of the application.

Claims

1. A package detection apparatus for a pressure sensor, characterized by, The utility model relates to a pressure sensor calibration device, including: The upper mounting plate (1) bottom respectively with the top of pressure structure (3) and the top of transmission (5) fixed connection, one end of the edge die (4) is connected with the pressure structure (3), and the other end of the edge die (4) is located at the top of pressure sensor (7), the bottom of transmission (5) and the bottom of pressure sensor (7) are arranged on the lower mounting frame (2), the pressure sensor (7) is connected with pressure calibrator (6), and the control device is connected with pressure structure (3), edge die (4), transmission (5) and pressure calibrator (6) communication respectively, and the control device is configured as: Through the preset pressure program control transmission (5), so that the upper mounting plate (1) drives pressure structure (3) and edge die (4) move to the direction close to the lower mounting frame (2); When the pressure plate (34) of pressure structure (3) contacts the electric connector of pressure sensor (7), the pressure value borne by the sealing ring (71) of pressure sensor (7) is acquired in real time through the pull pressure sensor (36) of pressure structure (3); When the pressure value borne by the sealing ring (71) reaches the preset pressure value, the edge die (4) is controlled to edge the pressure sensor (7); When the edge displacement of edge die (4) reaches the preset edge displacement, the preset lifting program is controlled to transmission (5), so that the upper mounting plate (1) drives pressure structure (3) and edge die (4) move to the direction away from the lower mounting frame (2); When pressure structure (3) is away from pressure sensor (7) by the preset distance, the transmission (5) is controlled to stop; The pressure calibrator (6) is controlled to start to determine whether the performance index of pressure sensor (7) reaches the standard performance index; If the performance index of pressure sensor (7) reaches the standard performance index, then the pressure sensor (7) is qualified; If the performance index of pressure sensor (7) does not reach the standard performance index, then the pressure sensor (7) is unqualified. The pressure structure (3) includes outer guide (31), inner guide (32), connecting plate (33), pressure plate (34) and spring (35).

2. The package detection apparatus of claim 1, wherein ​ The top of the outer guide (31) is fixedly connected with the upper mounting plate (1) by bolts, the inner guide (32) is sleeved with the outer guide (31), and the bottom end of the inner guide (32) is threadedly connected with one side of the connecting plate (33); the other side of the connecting plate (33) is threadedly connected with one end of the tension and compression sensor (36); the other end of the tension and compression sensor (36) is threadedly connected with the pressing plate (34); the spring (35) is sleeved outside the inner guide (32) and the outer guide (31); one end of the spring (35) is connected with the edge pressing die (4), and the other end of the spring (35) is connected with the connecting plate (33).

3. The package detection apparatus of claim 1, wherein The transmission device (5) comprises a screw nut, a lead screw (51), a bearing (52) and a motor (53); The screw nut is arranged at the bottom of the upper mounting plate (1), the lead screw (51) is arranged on the lower mounting frame (2), and the screw nut and the lead screw (51) are threadedly connected; one end of the lead screw (51) away from the screw nut is fixedly connected with the bearing (52), the inner side of the bearing (52) is sleeved on the lead screw (51), the outer side of the bearing (52) is sleeved with the lower mounting frame (2), and the motor (53) is located at the bottom of the lower mounting frame (2); the motor (53) is connected with the lead screw (51).

4. The package detection apparatus of claim 3, wherein The cross section of the lower mounting frame (2) is a rectangular frame structure; The motor (53) is fixedly connected in the rectangular frame, bearing mounting holes are formed in the top of the lower mounting frame (2) near one side of the motor (53), and the outer side of the bearing (52) is sleeved with the bearing mounting holes; The pressure calibrator (6) is fixedly connected in the rectangular frame, a pressure outlet is arranged on the pressure calibrator (6), a pressure interface is arranged on the pressure sensor (7), and the pressure outlet and the pressure interface are in butt joint.

5. The package detection apparatus of claim 1, wherein The transmission device (5) further comprises an inner guide column and an outer guide pipe, the inner guide column is arranged at the bottom of the upper mounting plate (1), and the outer guide pipe is arranged on the lower mounting frame (2); the inner guide column is slidably connected with the outer guide pipe.

6. The package detection apparatus of claim 1, wherein The pressing structure (3) is fixedly connected with a linear variable differential transformer, and the linear variable differential transformer is electrically connected with the control device; the control device is further configured to: When the pressing plate (34) of the pressing structure (3) contacts the electric connector of the pressure sensor (7), the linear variable differential transformer is controlled to acquire the downward displacement of the pressing structure (3) in real time; When the pressure value borne by the sealing ring (71) reaches a preset pressure value, it is judged whether the downward displacement of the pressing structure (3) reaches a designed displacement; If the downward displacement of the pressing structure (3) reaches the designed displacement, the edge pressing die (4) is controlled to press the edge of the pressure sensor (7).

7. The package detection apparatus of claim 1, wherein The control device is further configured to: The pressure calibrator (6) is controlled to set a standard pressure value according to the range and specifications of the pressure sensor (7); controlling the pressure calibrator (6) to slowly apply pressure to the pressure sensor (7) to the standard pressure value; controlling the pressure sensor (7) to collect an output pressure value; comparing the standard pressure value and the output pressure value to obtain an accuracy error; if the accuracy error meets the error requirement, determining that the performance index of the pressure sensor (7) reaches the standard performance index; if the accuracy error does not meet the error requirement, determining that the performance index of the pressure sensor (7) does not reach the standard performance index.

8. A control method of a package inspection apparatus of a pressure sensor, characterized by, The method for packaging detection of the pressure sensor of any one of claims 1-7, the method comprising: controlling the transmission device (5) through a preset pressing program, so that the upper mounting plate (1) drives the pressing structure (3) and the edge pressing die (4) to move towards the lower mounting frame (2); when the pressing plate (34) of the pressing structure (3) contacts the electrical connector of the pressure sensor (7), the pressure value borne by the sealing ring (71) of the pressure sensor (7) is obtained in real time by the tension sensor (36) of the pressing structure (3); when the pressure value borne by the sealing ring (71) reaches a preset pressure value, the edge pressing die (4) is controlled to press the edge of the pressure sensor (7); when the edge pressing displacement of the edge pressing die (4) reaches a preset edge pressing displacement, the transmission device (5) is controlled through a preset lifting program, so that the upper mounting plate (1) drives the pressing structure (3) and the edge pressing die (4) to move away from the lower mounting frame (2); when the pressing structure (3) is away from the pressure sensor (7) by a preset distance, the transmission device (5) is controlled to stop; controlling the pressure calibrator (6) to start to determine whether the performance index of the pressure sensor (7) reaches the standard performance index; if the performance index of the pressure sensor (7) reaches the standard performance index, the pressure sensor (7) is verified to be qualified; if the performance index of the pressure sensor (7) does not reach the standard performance index, the pressure sensor (7) is verified to be unqualified.

9. The control method of the package detection apparatus of a pressure sensor according to claim 8, characterized by, After obtaining the pressure value borne by the sealing ring (71) of the pressure sensor (7) by the tension sensor (36) of the pressing structure (3), the method further comprises: when the pressing plate (34) of the pressing structure (3) contacts the electrical connector of the pressure sensor (7), the linear variable differential transformer is controlled to obtain the downward displacement of the pressing structure (3) in real time; when the pressure value borne by the sealing ring (71) reaches a preset pressure value, it is determined whether the downward displacement of the pressing structure (3) reaches a design displacement; if the downward displacement of the pressing structure (3) reaches the design displacement, the edge pressing die (4) is controlled to press the edge of the pressure sensor (7).

10. The control method of the package detection apparatus of a pressure sensor according to claim 8, characterized by, controlling the pressure calibrator (6) to start to determine whether the performance index of the pressure sensor (7) reaches the standard performance index, comprising: controlling the pressure calibrator (6) to set a standard pressure value according to the range and specifications of the pressure sensor (7); controlling the pressure calibrator (6) to slowly apply pressure to the pressure sensor (7) to the standard pressure value; controlling the pressure sensor (7) to collect an output pressure value; comparing the standard pressure value and the output pressure value to obtain an accuracy error; if the accuracy error meets an error requirement, determining that the performance index of the pressure sensor (7) reaches a standard performance index; if the accuracy error does not meet the error requirement, determining that the performance index of the pressure sensor (7) does not reach the standard performance index.

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