Pressure sensor calibration device and equipment

Abstract

The present application discloses a pressure sensor calibration device and equipment, which relates to the technical field related to pressure sensor calibration, and is used to solve the problem of low efficiency of existing pressure sensor calibration tests. The pressure sensor calibration device provided by the present application includes a base, and the bottom of the guide is connected to the base. The insulated box and the guide are slidably matched along the first direction. The insulated box includes a bottom shell and a top cover, and the side of the bottom shell facing the top cover is used to carry the pressure sensor to be tested. The force measuring module includes a force sensor and a force transmission unit. The force sensor is fixedly connected to the top of the guide and is located outside the insulated box. The force transmission unit has a connecting part connected to the force sensor, and its contact part passes through the top cover and extends into the insulated box. The lifting module is arranged on the base and is located on the side of the bottom shell facing away from the top cover. The lifting module drives the insulated box to move along the first direction, so that the contact part contacts the pressure sensor to be tested, and the force sensor detects the actual pressure value of the pressure sensor to be tested.

Description

Technical Field

[0001] The present application relates to the technical field related to pressure sensor calibration, and in particular to a pressure sensor calibration device and equipment. Background Art

[0002] A pressure sensor is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to certain rules. Pressure sensors are usually composed of pressure sensitive elements and signal processing units. Pressure sensors are the most commonly used sensors in industrial practice. They are widely used in various industrial automatic control environments, involving many industries such as water conservancy and hydropower, railway transportation, automobiles, aerospace, military industry, petrochemicals, ships, machine tools, pipelines, etc.

[0003] Among them, pressure sensors are essential components in future autonomous vehicles. Pressure sensors need to be calibrated and tested before leaving the factory to prevent unqualified pressure sensors from entering the market and causing safety hazards.

[0004] However, the existing pressure sensor calibration device performs calibration tests through an insulated box and a lifting module. Among them, the insulated box wraps up the pressure sensor to be tested and the lifting parts of the lifting module together for temperature control. As a result, part of the temperature will be lost along the lifting parts during the temperature control of the insulated box, thereby increasing the difficulty of temperature control of the insulated box. In addition, the lifting parts are placed in the insulated box to apply pressure to the pressure sensor to be tested, which will cause the volume of the insulated box to increase. If the temperature of the pressure sensor to be tested needs to reach the calibration temperature, the insulated box needs to be temperature controlled for a longer time, resulting in low efficiency of the calibration test. Summary of the invention

[0005] The present application provides a pressure sensor calibration device and equipment, which can solve the problem of low calibration test efficiency caused by high temperature control difficulty and long temperature control time of the insulation box in the existing pressure sensor calibration device.

[0006] To achieve the above-mentioned purpose, on the one hand, the pressure sensor calibration device provided by the present application includes:

[0007] The mounting platform comprises a base and a guide member, wherein the guide member extends along a first direction and a bottom portion thereof is connected to the base;

[0008] A heat preservation box, which is slidably matched with the guide member along the first direction, and comprises a bottom shell and a top cover which are arranged opposite to each other along the first direction, wherein a side of the bottom shell facing the top cover is used for carrying the pressure sensor to be tested;

[0009] A force measuring module, comprising a force sensor and a force transmission unit, wherein the force sensor is fixedly connected to the top of the guide member and is located outside the incubator, and the force transmission unit has a connecting portion and a contact portion connected to each other, wherein the connecting portion is connected to the force sensor, and the contact portion extends into the incubator through the top cover;

[0010] The lifting module is arranged on the base and is located on the side of the bottom shell facing away from the top cover. The lifting module drives the thermal insulation box to move along the first direction so that the contact part contacts the pressure sensor to be tested, and the force sensor detects the actual pressure value of the pressure sensor to be tested through the force transmission unit.

[0011] On the other hand, the present application also provides a pressure sensor calibration device, comprising:

[0012] At least one pressure sensor calibration device as described in the above technical solution, wherein the heat preservation box in each of the pressure sensor calibration devices is connected to a heat conduction pipe;

[0013] The temperature control device is connected to the plurality of heat-conducting pipes so as to control the temperature of the plurality of heat-insulating boxes simultaneously.

[0014] The above technical solution of the present application has at least the following beneficial effects: the present application arranges the lifting module on the base, and makes it located on the side of the bottom shell facing away from the top cover. In other words, the present application arranges the lifting module outside the incubator, and is located at the bottom of the incubator. In addition, the force sensor of the present application is arranged outside the incubator, and it indirectly obtains the actual pressure value of the pressure sensor to be measured through the force transfer unit. With the above arrangement, on the one hand, it can prevent part of the temperature from being lost along the lifting module during the temperature control of the incubator, thereby reducing the difficulty of temperature control of the incubator. On the other hand, the incubator of the present application does not need to be placed with a lifting module and a force sensor, which is conducive to miniaturizing the volume of the incubator, thereby shortening the temperature control time of the incubator, and improving the calibration test efficiency of the pressure sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a front view of a pressure sensor calibration device in an embodiment of the present application;

[0017] Figure 2 is a cross-sectional view of an insulation box in a pressure sensor calibration device in an embodiment of the present application;

[0018] Figure 3 is a cross-sectional view of a calibration assembly and a lifting module in a pressure sensor calibration device in an embodiment of the present application;

[0019] Figure 4 It is a stereoscopic diagram of a pressure sensor calibration device in an embodiment of the present application.

[0020] The main reference numerals in the drawings of this application specification are described as follows:

[0021] 1-mounting platform; 11-base; 111-substrate; 112-carrying plate; 113-mounting plate; 114-support member; 12-guide member; 13-sliding member;

[0022] 2-insulation box; 21-bottom shell; 22-top cover; 23-housing; 24-installation fixture; 25-temperature sensor; 26-heat pipe;

[0023] 3-force measuring module; 31-force measuring sensor; 32-force transmission unit; 321-connecting part; 322-contact part; 323-second thermal insulation member;

[0024] 4-lifting module; 41-worm; 42-reducer; 43-drive motor;

[0025] 5- heat insulation unit; 51- first rigid part; 511- limiting part; 52- second rigid part; 53- first heat insulation part;

[0026] 6-calibration component; 61-fixing part; 611-frustum; 62-calibration part; 621-conical groove; 63-connecting part;

[0027] 7-Linear bearing;

[0028] Z - first direction. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0030] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] The present application provides a pressure sensor calibration device and a pressure sensor calibration equipment, which are described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. In the following embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0034] Reference Figure 1 and Figure 2The pressure sensor calibration device provided in the present application includes an installation platform 1, an insulation box 2, a force measuring module 3 and a lifting module 4. The installation platform 1 includes a base 11 and a guide member 12, the guide member 12 extends along a first direction Z, and its bottom is connected to the base 11. The insulation box 2 and the guide member 12 are slidably matched along the first direction Z. The insulation box 2 includes a bottom shell 21 and a top cover 22 arranged opposite to each other along the first direction Z. The side of the bottom shell 21 facing the top cover 22 is used to carry the pressure sensor to be tested. The force measuring module 3 includes a force sensor 31 and a force transmission unit 32. The force sensor 31 is fixedly connected to the top of the guide member 12 and is located outside the insulation box 2. The force transmission unit 32 has a connected connecting portion 321 and a contact portion 322. The connecting portion 321 is connected to the force sensor 31, and the contact portion 322 passes through the top cover 22 and extends into the insulation box 2. The lifting module 4 is arranged on the base 11 and is located on the side of the bottom shell 21 facing away from the top cover 22. The lifting module 4 drives the heat preservation box 2 to move along the first direction Z, so that the contact portion 322 contacts the pressure sensor to be measured, and the force sensor 31 detects the actual pressure value of the pressure sensor to be measured through the force transmission unit 32 .

[0035] In this technical solution, the present application arranges the lifting module 4 on the base 11, and makes it located on the side of the bottom shell 21 facing away from the top cover 22. In other words, the present application arranges the lifting module 4 outside the incubator 2, and is located at the bottom of the incubator 2. In addition, the force sensor 31 of the present application is arranged outside the incubator 2, and indirectly obtains the actual pressure value of the pressure sensor to be tested through the force transfer unit 32. With the above arrangement, on the one hand, it can prevent part of the temperature from being lost along the lifting module 4 during the temperature control of the incubator 2, thereby reducing the difficulty of temperature control of the incubator 2. On the other hand, the incubator 2 of the present application does not need to be placed with the lifting module 4 and the force sensor 31, which is conducive to realizing the miniaturization of the volume of the incubator 2, thereby shortening the temperature control time of the incubator 2 and improving the calibration test efficiency of the pressure sensor.

[0036] During specific use, since the force sensor 31 is fixedly mounted on the top of the guide member 12, its position will not change with the working state of the lifting module 4. The force transmission unit 32 is mounted on the bottom of the force sensor 31, and its contact portion 322 extends into the incubator 2. Therefore, when the lifting module 4 drives the incubator 2 to move upward, the pressure sensor to be tested placed in the incubator 2 will also move upward synchronously with the incubator 2. At this time, in the first direction Z, the distance between the contact portion 322 and the pressure sensor to be tested will gradually decrease until the two are in contact. When the contact portion 322 contacts the pressure sensor to be tested, since the force is mutual, the force sensor 31 can detect the upward driving force provided by the lifting module 4 to the incubator 2 through the force transmission unit 32 connected thereto, that is, the upward loading pressure applied by the lifting module 4 to the pressure sensor to be tested, so as to realize the calibration test of the pressure sensor to be tested.

[0037] For example, the above-mentioned thermal insulation box 2 includes a bottom shell 21 and a top cover 22, and an outer shell 23 connected between the bottom shell 21 and the top cover 22, and the three together enclose the thermal insulation box 2. The thermal insulation box 2 has a thermal insulation cavity for accommodating the pressure sensor to be tested. For example, the bottom shell 21 and the top cover 22 are both plate-shaped structures, and the outer shell 23 includes a left side plate, a right side plate, a front side plate and a rear side plate. Among them, the front side plate is made of a transparent material or at least a part of the front side plate is made of a transparent material, so that the situation inside the thermal insulation box 2 can be observed from the outside of the thermal insulation box 2 through the transparent area.

[0038] In some embodiments of the present application, a mounting through hole is provided on the bottom shell 21, and a heat insulation unit 5 is provided in the mounting through hole. The heat insulation unit 5 includes a first rigid member 51 and a second rigid member 52 spaced apart along a first direction Z. The first rigid member 51 can rigidly connect the bottom shell 21 and the lifting module 4. The side of the second rigid member 52 facing away from the first rigid member 51 is used to carry the pressure sensor to be tested. A first heat insulation member 53 is connected between the first rigid member 51 and the second rigid member 52 to separate the two. In this way, the first heat insulation member 53 is sandwiched between the first rigid member 51 and the second rigid member 52, so that the first rigid member 51 and the second rigid member 52 are separated or isolated in the first direction Z. The first heat insulation member 53 can block the heat transfer path inside and outside the heat preservation box 2, which is conducive to further reducing the temperature loss during the temperature control process of the heat preservation box 2. At the same time, a first rigid component 51 and a second rigid component 52 are respectively arranged on the upper and lower sides of the first thermal insulation component 53, so that when the lifting module 4 drives the thermal insulation box 2 to move along the first direction Z through the thermal insulation unit 5 to squeeze the pressure sensor to be tested, the first thermal insulation component 53 can be protected from deformation during the process of squeezing the pressure sensor to be tested.

[0039] In addition, the material of the insulated box 2 means that it cannot withstand greater pressure under normal circumstances. Therefore, the bottom shell 21 and the lifting module 4 are connected by the first rigid component 51, so that the lifting module 4 is located directly below the first rigid component 51. This can prevent the lifting module 4 from squeezing the insulated box 2 when driving the insulated box 2 to rise, thereby causing the insulated box 2 to deform.

[0040] Based on the above embodiment, the first rigid member 51 is disposed in the installation through hole and can block the installation through hole, thereby preventing the temperature of the thermal insulation box 2 from being lost through the gap between the installation through hole and the first rigid member 51. In addition, the first heat insulating member 53 extends out of the installation through hole on the side facing away from the first rigid member 51, so as to support the second rigid member 52 in the thermal insulation box 2, so that a first gap is formed between the second rigid member 52 and the bottom shell 21, so that the second rigid member 52 and the bottom shell 21 do not contact each other, thereby preventing the temperature in the thermal insulation box 2 from being lost through the second rigid member 52 and the bottom shell 21 of the thermal insulation box 2. In other words, the lower surface of the second rigid member 52 and the upper surface of the bottom shell 21 do not contact each other.

[0041] Similarly, the above-mentioned connecting portion 321 and contact portion 322 of the present application are both rigid parts and are spaced apart in the first direction Z. A second heat insulating member 323 is connected between the connecting portion 321 and the contact portion 322 to separate the two, so as to prevent the temperature of the insulation box 2 from being lost through the force transfer unit 32.

[0042] Furthermore, the connection portion 321 is slidably fitted in the assembly hole of the top cover 22 along the first direction Z, and when the contact portion 322 is not in contact with the pressure sensor to be tested, at least part of the connection portion 321 toward the second heat insulating member 323 extends into the heat preservation box 2 to better prevent the temperature of the heat preservation box 2 from being lost through the force transfer unit 32. In other words, before the calibration test is started, the bottom of the connection portion 321 has already extended into the heat preservation box 2, and after the calibration test is started, as the position of the heat preservation box 2 moves upward, the length of the connection portion 321 extending into the heat preservation box 2 will gradually increase until the contact portion 322 of the force transfer unit 32 contacts the pressure sensor to be tested.

[0043] For example, the first rigid member 51, the second rigid member 52, the connecting portion 321 and the contact portion 322 are all made of metal materials. The first rigid member 51, the second rigid member 52, the connecting portion 321 and the contact portion 322 are all cylindrical structures, and the end surface of the contact portion 322 facing away from the second thermal insulation member 323 is the contact end surface where the force sensing unit contacts the pressure sensor to be measured. Among them, the first thermal insulation member 53 can be made by coating a thermal insulation layer on the end surface of at least one of the first rigid member 51 and the second rigid member 52 facing the other. Similarly, the second thermal insulation member 323 can be made by coating a thermal insulation layer on the end surface of at least one of the connecting portion 321 and the contact portion 322 facing the other.

[0044] In order to achieve the sliding fit between the insulated box 2 and the guide member 12, the installation platform 1 of the present application also includes a sliding member 13, and the guide member 12 is arranged through the sliding member 13 to guide the sliding member 13 to slide along the first direction Z. The insulated box 2 and the lifting module 4 are respectively located on the opposite sides of the sliding member 13 in the first direction Z. The lifting module 4 indirectly drives the insulated box 2 to move along the first direction Z through the sliding member 13, ensuring that the sliding fit structure between the insulated box 2 and the guide member 12 is relatively simple, which is conducive to reducing the manufacturing cost of the pressure sensor calibration device. For example, the sliding member 13 is a sliding plate, and the sliding plate is provided with a sliding fit hole that passes through along the first direction Z, and the guide member 12 is slidably fitted in the sliding fit hole.

[0045] Alternatively, in some embodiments, the guide member 12 and the heat preservation box 2 are slidably connected via a guide rail assembly. Alternatively, in other embodiments, the guide member 12 and the heat preservation box 2 are slidably connected via a sliding groove and a sliding protrusion, that is, one of the guide member 12 and the heat preservation box 2 is provided with a sliding groove, and the other is provided with a sliding protrusion, and the sliding groove extends along the first direction Z, and the sliding protrusion is slidably matched in the sliding groove.

[0046] Continue to refer to Figure 2 A limiting portion 511 is provided on the side of the first rigid component 51 facing away from the first thermal insulation component 53, and an adapting portion is provided on the side of the sliding component 13 facing the bottom shell 21. The limiting portion 511 and the adapting portion cooperate with each other to limit the relative position of the sliding component 13 and the bottom shell 21 in a direction perpendicular to the first direction Z, thereby realizing mechanical cooperation between the sliding component 13 and the bottom shell 21.

[0047] For example, the above-mentioned limiting portion 511 is a limiting protrusion, the sliding member 13 has an upper surface facing the side of the bottom shell 21, the adapting portion is an adapting groove provided on the upper surface of the sliding member 13, and the limiting protrusion extends into the adapting groove. Among them, at least part of the limiting protrusion extends out of the lower surface of the bottom shell 21, so as to facilitate its cooperation with the adapting groove. Of course, the above-mentioned limiting portion 511 can also be a limiting groove, the sliding member 13 has an upper surface facing the side of the bottom shell 21, the adapting portion is an adapting protrusion provided on the upper surface of the sliding member 13, and the adapting protrusion extends into the limiting groove. In other words, the setting positions of the above-mentioned protrusion and the groove can be interchanged.

[0048] Among them, the above-mentioned heat preservation box 2 is provided with a mounting fixture 24, and the mounting fixture 24 is installed on the upper surface of the bottom shell 21. Specifically, the mounting fixture 24 is arranged on the side of the second rigid member 52 facing away from the first rigid member 51, and the pressure sensor to be tested is fixedly installed on the mounting fixture 24. A positioning portion is provided on the side of the second rigid member 52 facing away from the first heat insulation member 53, and a matching portion is provided on the side of the mounting fixture 24 facing the second rigid member 52. The positioning portion and the matching portion cooperate to form a positioning structure, and the positioning structure is used to limit the relative position of the mounting fixture 24 and the second rigid member 52 in a direction perpendicular to the first direction Z. For example, one of the positioning portion and the matching portion is a groove, and the other is a protrusion.

[0049] In some embodiments, the first thermal insulation member 53 and the second thermal insulation member 323 are both layered or thin plate structures, and both can be made of materials such as PEEK (polyetheretherketone), PPS (polyphenylene sulfide), PEI (polyetherimide), PAI (polyimide), PI (polyimide) or steel and wood. The first thermal insulation member 53 and the second thermal insulation member 323 are made of the same or different thermal insulation materials. Among them, the thickness of the first thermal insulation member 53 and the second thermal insulation member 323 in the first direction Z meets 10mm~30mm, so that it is easy to control the production cost of the first thermal insulation member 53 and the second thermal insulation member 323 on the basis of achieving thermal insulation.

[0050] In addition, the first rigid member 51 and the second rigid member 52 are provided with a receiving groove on the facing sides, and at least a portion of the first heat insulating member 53 near the first rigid member 51 extends into the receiving groove of the first rigid member 51, and at least a portion of the first heat insulating member 53 near the second rigid member 52 extends into the receiving groove of the second rigid member 52. Also, the connecting portion 321 and the contact portion 322 are provided with mounting grooves on the facing sides, and at least a portion of the second heat insulating member 323 near the connecting portion 321 extends into the mounting groove of the connecting portion 321, and at least a portion of the second heat insulating member 323 near the contact portion 322 extends into the mounting groove of the contact portion 322. Based on this, the first heat insulating member 53 and the second heat insulating member 323 are respectively installed and fixed.

[0051] Please refer to Figure 1 and Figure 3 ,Since the conical structure has an adaptive characteristic, that is, when two conical structures come into contact, they will automatically adjust their positions and angles to match each other, and this adaptability enables the two conical structures to automatically align during the contact process. Therefore, the above-mentioned pressure sensor calibration device also includes a calibration component 6, which includes a fixing part 61 and a calibration part 62. The fixing part 61 is connected to the end of the lifting part (such as the worm 41) of the lifting module 4 facing the sliding part 13, and the calibration part 62 is clamped between the fixing part 61 and the sliding part 13. The fixing part 61 is provided with a truncated table 611 on the side facing the calibration part 62. The calibration part 62 is provided with a conical groove 621 adapted to the truncated table 611. The central axis of the truncated table 611 is parallel to the first direction Z. From the fixing part 61 to the calibration part 62, the outer diameter of the truncated table 611 gradually decreases to ensure that the driving force applied by the lifting part to the sliding part 13 is always the same as the first direction Z, thereby realizing the correction of the vertical accuracy of the lifting module 4 and ensuring that the force applied by the lifting module 4 is perpendicular to the horizontal plane, so as to avoid the need to purchase an expensive lifting module 4 with high vertical lifting accuracy in order to ensure the verticality of the force, which is beneficial to reducing the manufacturing cost of the pressure sensor calibration device.

[0052] Alternatively, in other embodiments, a truncated cone 611 is provided at the bottom of the calibration member 62, and a conical groove 621 is provided at the top of the fixing member 61, and the outer diameter of the truncated cone 611 gradually decreases from the calibration member 62 to the fixing member 61. In other words, the positions of the truncated cone 611 and the conical groove 621 can be interchanged.

[0053] The calibration assembly 6 further includes a connecting member 63, which can connect the fixing member 61 and the top of the lifting member together. For example, the connecting member 63 is a screw, and a connecting hole is provided on the fixing member 61. The head of the screw presses the fixing member 61 against the top of the lifting member, and the threaded end of the screw passes through the connecting hole and is threadedly connected to the threaded inner hole at the top of the lifting member.

[0054] In order to further ensure that the sliding member 13 can only slide along the first direction Z, the movement trajectory of the sliding member 13 is limited to a straight line, thereby ensuring the accuracy of the calibration test of the pressure sensor to be tested, the guide member 12 includes at least two guide posts, the sliding member 13 and all the guide posts are slidably matched along the first direction Z, and the outer periphery of each guide post is sleeved with a linear bearing 7, which connects the corresponding guide post and the sliding member 13. All the guide posts extend along the first direction Z. For example, there are two guide posts, which are symmetrically arranged on opposite sides of the incubator 2.

[0055] In some embodiments, the lifting module 4 includes a worm 41, a worm wheel, a reducer 42 and a drive motor 43. The worm 41 is used to constitute the lifting member of the lifting module 4 and meshes with the worm wheel. The drive motor 43 is connected to the worm wheel through the reducer 42 to drive the worm 41 and the incubator 2 to move synchronously along the first direction Z. By setting the reducer 42 to drive the worm wheel and the worm 41 to drive the incubator 2 to rise or fall, a large range of pressure sources for rising and falling can be obtained. Among them, the coordination of the reducer 42 and the worm wheel and the worm 41 can make the comprehensive reduction ratio reach 2000:1 or more, that is, at this reduction ratio, it is easier to control the pressure required by the pressure sensor to be tested.

[0056] Please continue to refer to Figure 1 The lifting module 4 includes a worm 41, a worm wheel, a reducer 42 and a driving motor 43. The worm 41 is used to constitute the lifting member of the lifting module 4 and meshes with the worm wheel. The driving motor 43 is connected to the worm wheel through the reducer 42 to drive the worm 41 and the insulation box 2 to move synchronously along the first direction Z. Since the worm wheel 41 transmission has a self-locking property, that is, when the driving motor 43 stops rotating, the worm 41 will be blocked at any position and will not move spontaneously, so that the worm 41 can be maintained at any position.

[0057] In other embodiments, the lifting module 4 includes a lead screw, a nut, a reducer 42 and a drive motor 43. The nut is used to constitute a lifting member of the lifting module 4 and cooperates with the lead screw thread. The drive motor 43 drives the lead screw to rotate through the reducer 42 to drive the nut and the insulated box 2 to move synchronously along the first direction Z. Of course, the lifting module 4 can also be a hydraulic module.

[0058] Please refer to Figure 1 and Figure 4 The base 11 includes a substrate 111, a carrying plate 112 and a mounting plate 113 which are spaced apart along a first direction Z, and a support member 114 supported between the substrate 111 and the carrying plate 112. The guide member 12 is arranged on the carrying plate 112 to support and fix the mounting plate 113 above the carrying plate 112. The force sensor 31 is arranged at the bottom of the mounting plate 113. The lifting module 4 is arranged on the substrate 111. The lifting member of the lifting module 4 passes through the carrying plate 112 to drive the thermal insulation box 2 to move along the first direction Z, thereby realizing the modular structure of the pressure sensor calibration device.

[0059] For example, the base plate 111, the carrier plate 112 and the mounting plate 113 are all rectangular plate structures, and the support member 114 is a support column, and there are four of them, and the four support columns are respectively arranged at the four corresponding corners of the base plate 111 and the carrier plate 112. The support column is fixedly connected to the base plate 111 and the carrier plate 112 by bolts. The two ends of the guide member 12 are fixedly connected to the carrier plate 112 and the mounting plate 113 by bolts.

[0060] In some embodiments of the present application, a temperature sensor 25 is provided in the incubator 2, and the temperature sensor 25 detects the actual temperature value of the pressure sensor to be tested. A heat pipe 26 is provided on the incubator 2, and the heat pipe 26 is used to connect to the temperature control device. The pressure sensor calibration device also includes a control module, and the lifting module 4, the force sensor 31, the temperature sensor 25 and the temperature control device are all electrically connected to the control module. The control module realizes the calibration of the pressure sensor to be tested based on the actual pressure value and the actual temperature value. The control module can realize the automated calibration test of the pressure sensor to be tested. For example, the heat pipe 26 is a high temperature resistant silicone connecting tube.

[0061] Specifically, the control module includes a storage submodule, a pressure control circuit and a temperature control circuit. Before the calibration test is performed, the calibration pressure value and the calibration temperature value required for the calibration and test are stored in the storage submodule in sequence. The force sensor 31 transmits the actual pressure value to the control module through the pressure control circuit. The control module issues a corresponding pressure control instruction to the lifting module 4 based on the actual pressure value and the calibration pressure value to control the loading pressure of the lifting module 4. The temperature sensor 25 transmits the actual temperature value to the control module through the temperature control circuit. The control module issues a corresponding temperature control instruction to the temperature control device based on the actual temperature value and the calibration temperature value to control the temperature in the incubator 2. When the control of the actual temperature value and the actual pressure value reaches the target required for calibration or testing (calibration pressure value and calibration temperature value), the calibration test of the pressure sensor to be tested is started. The calibration test process does not require human participation and can be automatically operated.

[0062] In some embodiments, the present application also provides a pressure sensor calibration device, which includes at least one pressure sensor calibration device and a temperature control device as described in the above technical solution, and a heat pipe 26 is connected to the heat preservation box 2 in each pressure sensor calibration device. A temperature control device is connected to multiple heat pipes 26 to simultaneously control the temperature of multiple heat preservation boxes 2. As a result, one temperature control device simultaneously controls the temperature of one or more heat preservation boxes 2, thereby further improving the calibration test efficiency of the pressure sensor to be tested. Among them, the above-mentioned temperature control device is an ultra-fast temperature change device.

[0063] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0064] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims. In addition, the specification uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application. The content of this specification should not be understood as a limitation on the present application.

Claims

1. A pressure sensor calibration device, characterized in that: include: A mounting platform (1) comprising a base (11) and a guide member (12), wherein the guide member (12) extends along a first direction and a bottom portion thereof is connected to the base (11); The heat preservation box (2) is slidably matched with the guide member (12) along the first direction, and comprises a bottom shell (21) and a top cover (22) arranged opposite to each other along the first direction, wherein a side of the bottom shell (21) facing the top cover (22) is used for carrying the pressure sensor to be tested; A force measuring module (3), comprising a force sensor (31) and a force transmission unit (32), wherein the force sensor (31) is fixedly connected to the top of the guide member (12) and is located outside the heat preservation box (2), and the force transmission unit (32) has a connecting portion (321) and a contact portion (322) connected to each other, wherein the connecting portion (321) is connected to the force sensor (31), and the contact portion (322) passes through the top cover (22) and extends into the heat preservation box (2); A lifting module (4) is arranged on the base (11) and is located on a side of the bottom shell (21) facing away from the top cover (22). The lifting module (4) drives the thermal insulation box (2) to move along the first direction, so that the contact portion (322) contacts the pressure sensor to be tested, and enables the force sensor (31) to detect an actual pressure value of the pressure sensor to be tested through the force transmission unit (32).

2. The pressure sensor calibration device according to claim 1, characterized in that: The bottom shell (21) is provided with a mounting through hole, and a heat insulation unit (5) is provided in the mounting through hole. The heat insulation unit (5) comprises a first rigid member (51) and a second rigid member (52) which are arranged at intervals along the first direction. The first rigid member (51) connects the bottom shell (21) and the lifting module (4). The second rigid member (52) is used to carry the pressure sensor to be tested on a side facing away from the first rigid member (51). A first heat insulation member (53) is connected between the first rigid member (51) and the second rigid member (52) to separate the two.

3. The pressure sensor calibration device according to claim 2, characterized in that: The first rigid component (51) is arranged in the mounting through hole and is capable of blocking the mounting through hole, and the first heat insulating component (53) extends out of the mounting through hole on the side facing away from the first rigid component (51) to support the second rigid component (52) inside the thermal insulation box (2), so that a first gap is formed between the second rigid component (52) and the bottom shell (21).

4. The pressure sensor calibration device according to any one of claims 1 to 3, characterized in that: The connecting portion (321) and the contact portion (322) are both rigid parts and are arranged at intervals in the first direction. A second heat insulating member (323) is connected between the connecting portion (321) and the contact portion (322) to separate the two.

5. The pressure sensor calibration device according to claim 4, characterized in that: The connecting portion (321) is slidably fitted into the assembly hole of the top cover (22) along the first direction, and when the contact portion (322) is not in contact with the pressure sensor to be tested, at least a portion of the connecting portion (321) extends into the thermal insulation box (2) toward the second thermal insulation member (323).

6. The pressure sensor calibration device according to claim 2, characterized in that: The mounting platform (1) further comprises a sliding member (13), the guide member (12) being passed through the sliding member (13) to guide the sliding member (13) to slide along the first direction, the thermal insulation box (2) and the lifting module (4) being respectively located on opposite sides of the sliding member (13) in the first direction, and the lifting module (4) indirectly drives the thermal insulation box (2) to move along the first direction via the sliding member (13).

7. The pressure sensor calibration device according to claim 6, characterized in that: A limiting portion (511) is provided on the side of the first rigid component (51) facing away from the first heat insulating component (53), and an adapting portion is provided on the side of the sliding component (13) facing the bottom shell (21), wherein the limiting portion (511) and the adapting portion cooperate with each other to limit the relative position of the sliding component (13) and the bottom shell (21) in a direction perpendicular to the first direction.

8. The pressure sensor calibration device according to claim 6, characterized in that: The invention also comprises a calibration component (6), wherein the calibration component (6) comprises a fixing part (61) and a calibration part (62), wherein the fixing part (61) is connected to one end of the lifting part of the lifting module (4) facing the sliding part (13), and the calibration part (62) is clamped between the fixing part (61) and the sliding part (13), and a frustum (611) is provided on the side of the fixing part (61) facing the calibration part (62), and a conical groove (621) matched with the frustum (611) is provided on the calibration part (62), and the central axis of the frustum (611) is parallel to the first direction, and the outer diameter of the frustum (611) gradually decreases from the fixing part (61) to the calibration part (62).

9. The pressure sensor calibration device according to claim 6 or 8, characterized in that: The guide member (12) comprises at least two guide posts, the sliding member (13) and all the guide posts are slidably matched along the first direction, a linear bearing (7) is sleeved on the outer circumference of each guide post, and the linear bearing (7) connects the corresponding guide post and the sliding member (13).

10. The pressure sensor calibration device according to claim 1 or 8, characterized in that: The lifting module (4) comprises a worm (41), a worm wheel, a reducer (42) and a drive motor (43); the worm (41) is used to constitute a lifting member of the lifting module (4) and is meshed with the worm wheel; the drive motor (43) is connected to the worm wheel through the reducer (42) to drive the worm (41) and the thermal insulation box (2) to move synchronously along the first direction.

11. The pressure sensor calibration device according to claim 1, characterized in that: The base (11) comprises a substrate (111), a carrying plate (112) and a mounting plate (113) which are arranged at intervals along the first direction, and a support member (114) supported between the substrate (111) and the carrying plate (112); the guide member (12) is arranged on the carrying plate (112) to support the mounting plate (113) above the carrying plate (112); the force sensor (31) is arranged at the bottom of the mounting plate (113); the lifting module (4) is arranged on the substrate (111); and the lifting member of the lifting module (4) passes through the carrying plate (112) to drive the thermal insulation box (2) to move along the first direction.

12. The pressure sensor calibration device according to claim 1, characterized in that: The heat preservation box (2) is provided with a temperature sensor (25), and the temperature sensor (25) detects the actual temperature value of the pressure sensor to be tested. The heat preservation box (2) is provided with a heat pipe (26), and the heat pipe (26) is used to be connected to a temperature control device. The pressure sensor calibration device also includes a control module. The lifting module (4), the force sensor (31), the temperature sensor (25) and the temperature control device are all electrically connected to the control module. The control module realizes calibration of the pressure sensor to be tested based on the actual pressure value and the actual temperature value.

13. A pressure sensor calibration device, characterized in that: include: At least one pressure sensor calibration device according to any one of claims 1 to 12, wherein a heat pipe (26) is connected to the heat preservation box (2) in each of the pressure sensor calibration devices; The temperature control device is connected to the plurality of heat-conducting pipes (26) so as to control the temperature of the plurality of heat-insulating boxes (2) simultaneously.

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