阅读说明：本技术 一种提高感压胶片压力测量精度的装置及方法 (Device and method for improving pressure measurement precision of pressure-sensitive film ) 是由 温世杰 周海涛 景国玺 于 2020-12-11 设计创作，主要内容包括：本发明提供了一种提高感压胶片压力测量精度的装置及方法,包括加载装置及压头结构,加载装置用于对压头结构施加载荷,压头结构用于对感压胶片施加载荷。本发明所述的一种提高感压胶片压力测量精度的装置,解决了现有技术中的测量系统所标识的测试精度在-10％～+10％之间,测量误差较大,不能够满足实际应用中需要的测量精度的技术问题。(The invention provides a device and a method for improving pressure measurement precision of a pressure-sensitive film. The device for improving the pressure measurement precision of the pressure-sensitive film solves the technical problems that the measurement precision identified by a measurement system in the prior art is-10% to + 10%, the measurement error is large, and the measurement precision required in practical application cannot be met.)

1. The utility model provides an improve pressure-sensitive film pressure measurement accuracy's device which characterized in that: the loading device is used for applying load to the pressure head structure, and the pressure head structure is used for applying load to the pressure sensing film (3).

2. The apparatus of claim 1, wherein the pressure sensitive film pressure measurement unit comprises: the loading device is a fixed pressing block (1).

3. The apparatus of claim 2, wherein the pressure sensitive film pressure measurement unit further comprises: the pressure head structure includes at least three pressure head (2), each pressure head (2) all with fixed briquetting (1) can be dismantled and be connected, fixed briquetting (1) is to each the load that pressure head (2) was applyed is the same, pressure head (2) are used for applying load to pressure sensing film (3), the terminal surface all is located the coplanar under pressure head (2).

4. The apparatus of claim 3, wherein the pressure sensitive film pressure measurement unit further comprises: the fixed pressing block (1) is provided with a plurality of grooves which can be matched with the pressing heads (2), and the number of the grooves is consistent with that of the pressing heads (2).

5. The apparatus of claim 1, wherein the pressure sensitive film pressure measurement unit comprises: the loading device is load loading equipment.

6. The apparatus of claim 5, wherein the pressure sensitive film pressure measurement unit further comprises: the pressure head structure includes standard briquetting (11) and steel ball (4), standard briquetting (11) up end be equipped with can with steel ball (4) complex bell jar, standard briquetting (11) are the cylinder, work as steel ball (4) set up when in the bell jar, the focus of steel ball (4) with the central line coincidence of standard briquetting (11), load loading equipment is used for right steel ball (4) load application, standard briquetting (11) are used for applying load to pressure sensing film (3).

7. A method for improving pressure measurement precision of a pressure-sensitive film is characterized by comprising the following steps: when using the device according to any of claims 1-6, comprising the steps of:

the method comprises the following steps: the pressure value applied to the pressure head structure by the loading device is P1, the pressure head structure is stably placed on the pressure-sensitive film (3) to be used and stands for 5 minutes, and the pressure head structure generates an indentation on the pressure-sensitive film (3);

step two: reading the pressure sensing film (3) by a pressure analysis device to obtain a pressure load value P2, and calculating a ratio P1/P2;

step three: starting an actual pressure measurement test, reading pressure measurement data of the pressure sensing film (3), wherein the pressure measurement data is Pn, and obtaining a final accurate pressure value P through calculation according to a ratio recorded before: p is Pn × P1/P2.

Technical Field

The invention belongs to the technical field of pressure measurement, and particularly relates to a device and a method for improving pressure measurement precision of a pressure-sensitive film.

Background

The pressure-sensitive film can be used for measuring the contact pressure of the contact surfaces of two objects, and is commonly used for measuring the contact pressure of the upper surface and the lower surface of a cylinder gasket, the sealing pressure of a water cavity sealing rubber ring of a cylinder cover and the like in the field of internal combustion engines. The pressure sensitive film used most frequently in the market at present has the testing principle that when the pressure sensitive film bears pressure, microcapsules are broken, the chromogenic substance and the chromogenic substance react with each other, a red area appears on the film, and the color concentration changes along with the change of the pressure. And converting the image color depth data into contact pressure data by using a professional image recognition software corresponding to the pressure map.

The measurement accuracy of the pressure-sensitive film is closely related to the measurement environment temperature, humidity, the state of the measurement equipment, the factory time and the storage state of the pressure-sensitive film, but the original test system cannot avoid the influence of the factors on the measurement accuracy, the test accuracy identified by the measurement system in the prior art is between-10% and + 10%, the measurement error is large, and the measurement accuracy required in practical application cannot be met.

Disclosure of Invention

In view of this, the present invention aims to provide a device and a method for improving the pressure measurement accuracy of a pressure-sensitive film, which solve the technical problems that the measurement accuracy identified by the measurement system in the prior art is between-10% and + 10%, the measurement error is large, and the measurement accuracy required in practical application cannot be met.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the device for improving the pressure measurement precision of the pressure-sensitive film comprises a loading device and an indenter structure, wherein the loading device is used for applying a load to the indenter structure, and the indenter structure is used for applying a load to the pressure-sensitive film.

Further, the loading device is a fixed pressing block.

Further, the pressure head structure includes at least three pressure heads, each the pressure head all with fixed briquetting can dismantle the connection, fixed briquetting is to each the load that the pressure head was applyed is the same, the pressure head is used for applying load to the pressure sensing film, the terminal surface all is located the coplanar under the pressure head.

Furthermore, a plurality of grooves capable of being matched with the pressure heads are formed in the fixed pressing block, and the number of the grooves is consistent with that of the pressure heads.

Further, the loading device is a load loading device.

Further, the pressure head structure includes standard briquetting and steel ball, the standard briquetting up end be equipped with can with steel ball complex bell jar, the standard briquetting is the cylinder, works as the steel ball sets up when in the bell jar, the focus of steel ball with the central line coincidence of standard briquetting, load loading equipment is used for right the steel ball loads, the standard briquetting is used for applying load to the pressure sensing film.

When the device is used, the method for improving the pressure measurement precision of the pressure-sensitive film comprises the following steps:

the method comprises the following steps: the pressure value applied to the pressure head structure by the loading device is P1, the pressure head structure is stably placed on the pressure-sensitive film to be used and stands for 5 minutes, and the pressure head structure generates an indentation on the pressure-sensitive film;

step two: reading the pressure sensing film by using a pressure analysis device to obtain a pressure load value P2, and calculating a ratio P1/P2;

step three: starting an actual pressure measurement test, reading pressure measurement data of the pressure sensing film, wherein the pressure measurement data is Pn, and obtaining a final accurate pressure value P through calculation according to a ratio recorded before: p is Pn × P1/P2.

Compared with the prior art, the device and the method for improving the pressure measurement precision of the pressure-sensitive film have the following advantages:

the device and the method for improving the pressure measurement precision of the pressure-sensitive film can obviously improve the measurement precision of the pressure-sensitive film, and can ensure that the pressure measurement precision is controlled between-5% and + 5% in practical application

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of an operation structure of an apparatus for improving pressure measurement accuracy of a pressure-sensitive film according to a first embodiment of the present invention;

FIG. 2 is a schematic diagram of an operation structure of an apparatus for improving pressure measurement accuracy of a pressure-sensitive film according to a second embodiment of the present invention;

FIG. 3 is a schematic diagram of a combination structure of a pressing block and a pressing head in the apparatus for improving the pressure measurement accuracy of a pressure-sensitive film according to the first embodiment of the present invention;

FIG. 4 is a block structure of an apparatus for improving the pressure measurement accuracy of a pressure-sensitive adhesive sheet according to a second embodiment of the present invention;

FIG. 5 is a schematic diagram of an embodiment of an apparatus for improving pressure measurement accuracy of a pressure-sensitive film according to the present invention;

fig. 6 is a schematic diagram of a pressing block structure in the apparatus for improving the pressure measurement accuracy of a pressure-sensitive film according to the first embodiment of the present invention.

Description of reference numerals:

1. fixing a pressing block; 11. standard briquetting; 2. a pressure head; 3. a pressure sensitive film; 4. a steel ball; 5. the load loads the ram of the device.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The utility model provides an improve pressure-sensitive film pressure measurement accuracy's device, includes fixed briquetting 1 and at least three pressure head 2, and each pressure head 2 all can be dismantled with fixed briquetting 1 and be connected, and fixed briquetting 1 is the same to the load that each pressure head 2 applyed, and pressure head 2 is used for applying load to pressure-sensitive film 3, and the terminal surface all is located the coplanar under the pressure head 2.

The fixed pressing block 1 is provided with a plurality of grooves capable of being matched with the pressing heads 2, the number of the grooves is consistent with that of the pressing heads 2, in the embodiment, the number of the pressing heads 2 is 3, the structure of the pressing heads 2 is shown in figure 5, and the fixed pressing block 1 is shown in figure 6.

A method for improving the accuracy of pressure-sensitive film pressure measurement, as shown in fig. 1, when using the above-described apparatus, comprising the steps of:

the method comprises the following steps: a pressure head 2 is correspondingly arranged in each groove of the fixed pressing block 1;

step two: the fixed pressing block 1 can generate a pressure value P1 to the pressing heads 2, each pressing head 2 is stably placed on the pressure-sensitive film 3 to be used and stands for 5 minutes, and each pressing head 2 generates red impressions on the pressure-sensitive film 3;

step three: reading the pressure sensing film 3 by a pressure analysis device to obtain a pressure load value P2, and calculating a ratio of P1/P2;

step four: starting an actual pressure measurement test, reading pressure measurement data of the pressure sensing film 3, wherein the pressure measurement data is Pn, and obtaining a final accurate pressure value P through calculation according to a ratio recorded before: p is Pn × P1/P2.

A device for improving the pressure measurement precision of a pressure-sensitive film comprises a standard pressing block 11, a steel ball 4 and load loading equipment;

the upper end face of the standard pressing block 11 is provided with a tapered groove capable of being matched with the steel ball 4, the standard pressing block 11 is a cylinder, when the steel ball 4 is arranged in the tapered groove, the gravity center of the steel ball 4 coincides with the central line of the standard pressing block 11, the load loading equipment is used for applying load to the steel ball 4, and the standard pressing block 11 is used for applying load to the pressure-sensitive rubber sheet 3.

A method for improving the accuracy of pressure-sensitive film pressure measurement, as shown in fig. 2, when using the above-mentioned apparatus, comprising the steps of:

the method comprises the following steps: placing the steel ball 4 in the conical groove;

step two: the pressure value applied to the steel ball 4 by the pressure head 5 of the load loading equipment is P1, the standard pressing block 11 is stably placed on the pressure-sensitive film 3 to be used, the standing is carried out for 5 minutes, and the standard pressing block 11 generates red indentation on the pressure-sensitive film 3;

step three: reading the pressure sensing film 3 by a pressure analysis device to obtain a pressure load value P2, and calculating a ratio of P1/P2;

step four: the method comprises the following steps of starting an actual pressure measurement test, such as a vehicle engine cylinder head gasket surface pressure test, placing a pressure sensing film (3) on the upper surface of a cylinder head gasket, fastening the cylinder head gasket, a cylinder body and a cylinder cover combined structure through fastening screws according to a pre-tightening specification, detaching and taking down the pressure sensing film (3) after standing for five minutes, reading pressure measurement data of the pressure sensing film (3), wherein the pressure measurement data is Pn, and obtaining a final accurate pressure value P through calculation according to a ratio recorded before: p is Pn × P1/P2.

The method of the first embodiment and the method of the second embodiment can avoid the influence of the ambient temperature, the humidity and the state of the pressure-sensitive film on the original measurement system, thereby obtaining high-precision pressure measurement data.

Commonly used pressure sensitive films are classified into low pressure, medium pressure, high pressure and ultra high pressure films, and the measured pressure ranges are shown in table 1:

TABLE 1

Species of	Low pressure (MPa)	Medium pressure (MPa)	High pressure (MPa)	Ultra-high pressure (MPa)
					Measuring range	2.5～10	10～50	50～130	130～300

The combination of the fixed pressing block 1 and the pressing head 2 in the first embodiment can generate a pressure value of 5MPa or 20MPa, respectively, so that the device in the first embodiment is suitable for calibrating low-pressure and medium-pressure-sensitive films, and the high-pressure and ultrahigh-pressure-sensitive films should be calibrated by using a pressure tester to provide higher load values as shown in fig. 1.

The load loading device in the second embodiment is a compression testing machine, the standard pressing block 11 for the calibration device of the compression testing machine is a cylinder, as shown in fig. 4, a tapered groove is processed on the upper surface of the pressing block 1, the tapered groove is used for placing the steel ball 4, the lower surface of the pressing block 1 can be processed into a ring shape or a cylinder shape according to the pressure measurement range of the pressure-sensitive film, and the area of the actual contact surface of the pressing block 1 is recorded. The steel ball 4 can uniformly apply load on the standard pressing block 11, so that the condition that the imaging of the pressure-sensitive film is not uniform due to insufficient parallelism of the loaded end face of the load loading equipment is effectively avoided, and the system is an important part of the system.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.