阅读说明：本技术 一种多传感器并联式力值测量方法 (Multi-sensor parallel force value measuring method ) 是由 张中杰 单海娣 冯海盈 任翔 张锁 赵辉 乔淑芳 陆新 赵盈哲 王阳阳 郭名芳 于 2021-08-09 设计创作，主要内容包括：本发明涉及一种多传感器并联式力值测量方法,该方法包括以下步骤,第一步,选择输出力值与单个力传感器测量范围匹配的测试压力机对单个力传感器进行施压,根据力传感器受压后的变形高度和力传感器所受到的受压力计算力传感器的弹性系数k；第二步,选择至少四个弹性系数相同的力传感器用于对待测量压力机进行压力检测,各力传感器竖向并列布置,调整各力传感器的顶部受力点高度一致,第三步,待测量压力机的压头通过传力板向各力传感器的顶部受力点施压。本发明解决了现有技术中,在超过三个力传感器并联使用时,无法保证各力传感器均匀受力的技术问题。(The invention relates to a force value measuring method of a multi-sensor parallel connection type, which comprises the following steps that firstly, a testing press machine with an output force value matched with the measuring range of a single force sensor is selected to press the single force sensor, and the elastic coefficient k of the force sensor is calculated according to the deformation height of the pressed force sensor and the pressed force of the force sensor; and secondly, selecting at least four force sensors with the same elastic coefficient for carrying out pressure detection on the pressure machine to be measured, arranging the force sensors vertically in parallel, adjusting the top stress points of the force sensors to be consistent in height, and thirdly, applying pressure to the top stress points of the force sensors by a pressure head of the pressure machine to be measured through a force transfer plate. The invention solves the technical problem that the uniform stress of each force sensor cannot be ensured when more than three force sensors are used in parallel in the prior art.)

1. A multi-sensor parallel force value measuring method is characterized in that: the method comprises the following steps that firstly, a testing press machine with an output force value matched with the measuring range of a single force sensor is selected to apply pressure to the single force sensor, and the elastic coefficient k of the force sensor is calculated according to the deformation height of the pressed force sensor and the pressed force of the force sensor; and secondly, selecting at least four force sensors with the same elastic coefficient for carrying out pressure detection on the pressure machine to be measured, arranging the force sensors vertically in parallel, adjusting the top stress points of the force sensors to be consistent in height, and thirdly, applying pressure to the top stress points of the force sensors by a pressure head of the pressure machine to be measured through a force transfer plate.

2. The multi-sensor parallel force measurement method according to claim 1, characterized in that: the top of each force sensor is an upward-convex arc-shaped stress structure, and the highest point of the arc-shaped stress structure forms a top stress point of the force sensor.

3. The multi-sensor parallel force measurement method according to claim 1, characterized in that: in the second step, the number of the force sensors is four, five or six, and the force sensors are uniformly arranged along the circumferential direction at intervals.

4. The multi-sensor parallel force measurement method according to claim 1, characterized in that: in the second step, the heights of the top stress points of the force sensors are adjusted to be consistent by adding or removing the gaskets on the bottoms of the stress sensors.

5. The multi-sensor parallel force measurement method according to claim 1, characterized in that: the maximum force measurement value of a single force sensor is 20 MN.

Technical Field

The invention relates to a multi-sensor parallel force value measuring method in the field of force value measurement and calibration.

Background

The press is a common force output device, and when the press is used, acting force is output outwards through the action of a press head, and the force value output of the press head is a key parameter of the performance of the press. According to corresponding requirements, the output force value of the press machine needs to be detected and calibrated so as to ensure the force value output capacity of the press machine.

In the prior art, a resistance strain gauge type force sensor is usually used for detecting and calibrating the output pressure of the press, for example, the force sensor is directly pressed by a pressure head, and due to the restriction of various local specifications and other various factors, the maximum force value which can be detected by a single force sensor in China is 20MN, that is, when the output pressure of the press is less than 20MN, the single force sensor can be used for detecting and calibrating the output pressure of the press.

When the output pressure of press is greater than 20MN, generally adopt three point parallel structure to realize the detection calibration to press output pressure, say for example when the output pressure of press is about 50MN, adopt three 20 MN's force transducer to be triangle-shaped and distribute side by side, the pressure head of press is through a biography power board simultaneously to three force transducer effect, because three points can look for the balance by oneself, consequently three force transducer can jointly evenly undertake the effort of pressure head to accomplish the detection calibration to press output pressure. However, as press technology matures, presses with output values in excess of 60MN have emerged, such as 80MN, 100MN, etc., for which calibration is difficult. If three points are stressed, all stress points can be self-balanced and bear stress uniformly, but a non-three-point stress structure cannot realize self-balancing, so that if the force sensors are simply connected in parallel, the force sensors cannot be guaranteed to share the acting force of a pressure head uniformly, and the situation that one pressure sensor is broken first and then other pressure sensors are broken occurs.

Disclosure of Invention

The invention aims to provide a multi-sensor parallel force value measuring method, which aims to solve the technical problem that the uniform stress of each force sensor cannot be ensured when more than three force sensors are used in parallel in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

a force value measuring method of a multi-sensor parallel connection type comprises the following steps that firstly, a testing press machine with an output force value matched with a measuring range of a single force sensor is selected to apply pressure to the single force sensor, and an elastic coefficient k of the force sensor is calculated according to the deformation height of the force sensor after being pressed and the pressed force of the force sensor; and secondly, selecting at least four force sensors with the same elastic coefficient for carrying out pressure detection on the pressure machine to be measured, arranging the force sensors vertically in parallel, adjusting the top stress points of the force sensors to be consistent in height, and thirdly, applying pressure to the top stress points of the force sensors by a pressure head of the pressure machine to be measured through a force transfer plate.

The top of each force sensor is an upward-convex arc-shaped stress structure, and the highest point of the arc-shaped stress structure forms a top stress point of the force sensor.

In the second step, the number of the force sensors is four, five or six, and the force sensors are uniformly arranged along the circumferential direction at intervals.

In the second step, the heights of the top stress points of the force sensors are adjusted to be consistent by adding or removing the gaskets on the bottoms of the stress sensors.

The maximum force measurement value of a single force sensor is 20 MN.

The invention has the beneficial effects that: in the invention, when a press machine to be measured with an overlarge force value is tested, at least four force sensors are selected to be stressed in parallel, and the key point at the moment is that each force sensor needs to be stressed in a balanced manner to ensure that the force sensors are not damaged so as to realize force value measurement, therefore, the press machine to be tested is firstly used for pressing each force sensor to obtain the elastic coefficient of each force sensor, the force sensors with the consistent elastic coefficient are selected to be used in parallel, the consistent elastic coefficient means that the displacement variation is consistent when the force sensors are subjected to the same magnitude of acting force, then the top stress points of each force sensor are adjusted to be consistent in height, the pressure head of the press machine to be measured applies pressure to the top stress points of each force sensor through a force transfer plate, so that the acting force of the pressure head of the press machine to be measured can be uniformly shared to each force sensor, and the output pressure value of the press machine to be measured can be ensured to be measured, and the situation that a certain force sensor is damaged due to overlarge stress and other force sensors are damaged accordingly can not occur.

Through the parallel connection of four 20MN force sensors, the force value detection of the press machine with the output force value exceeding 60MN can be realized.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of a force measurement method with multiple sensors in parallel according to the present invention;

fig. 2 is a schematic diagram of the distribution of the force sensors on the base in fig. 1.

Detailed Description

The embodiment of the multi-sensor parallel force value measuring method is shown in figures 1-2: the method comprises the following steps that firstly, a testing press machine with an output force value matched with the measuring range of a single force sensor 5 is selected to apply pressure to the single force sensor, and the elastic coefficient k of the force sensor is calculated according to the deformation height of the pressed force sensor and the pressed force of the force sensor; and secondly, selecting four force sensors 5 with the same elastic coefficient for carrying out pressure detection on the pressure machine to be measured, arranging the force sensors 5 vertically in parallel, arranging the force sensors in sequence along the circumferential direction, adjusting the top stress points 4 of the force sensors to be consistent in height, and thirdly, pressing the pressure head 10 of the pressure machine to be measured to the top stress points 4 of the force sensors through a force transmission plate.

In above-mentioned first step, the output power value of test press and the matching in the single force sensor measuring range match mean that single force sensor can be used for measuring the output power value of test press, how to match belongs to prior art, skilled person knows, when will accomplishing force sensor and measuring the test press, the output power value of test press can not be too big and surpass force sensor's the biggest atress limit (can crush force sensor like this), the output power value of test press also can not be too little than force sensor's measuring range, the test press just can not cause deformation to force sensor like this, and can't obtain force sensor's coefficient of elasticity. The output force value of the test press is 10-80% of the force value detection range of the force sensor, and the output force value of the test press is matched with the measurement range of the force sensor within the range.

The top of each force sensor 5 is an upward-convex arc-shaped stress structure, and the highest point of the arc-shaped stress structure forms a top stress point 4 of the force sensor. The maximum force measurement value of a single force sensor in this embodiment is 20MN, and the force sensor is a resistance strain gauge type force sensor. The force-measuring structure of the force sensor belongs to the prior art and is not described in detail here.

In the second step, the top stress points of the force sensors are adjusted to be consistent in height by adding or removing the gasket 9 at the bottom of the stress sensor.

As shown in fig. 1: the four force sensors with the same elastic coefficient are vertically arranged on the base 8 in parallel, the force sensors 5 are arranged at intervals along the circumferential direction, the top stress points of the force sensors are adjusted in a mode of increasing or decreasing the gaskets 9 at the bottoms of the stress sensors, and the force transmission plate comprises an upper force transmission plate 1 and a lower force transmission plate 6 which are arranged at intervals from top to bottom. In the third step, place the downside biography power board 6 that the level was arranged on each top stress point 4, the upper end of downside biography power board 6 is provided with biography power strip 3, and interval arrangement about two biography power strips 3, the pressure head of the volume of awaiting measuring press is exerted pressure to the biography power strip through upside biography power board, and the pressure head corresponds with the middle part of upside biography power board, and the effort of pressure head passes through the even transmission of upside biography power board, biography power strip and downside biography power board and gives each force transducer. The force-transmitting strip 3 is located directly above the top force-bearing point 4 of the counter-stress sensor.

In this embodiment, the top of each biography power strip 3 is arc structure 2, for line contact cooperation mode between biography power strip 3 and the upside dowel steel 1, the effect that sets up biography power strip 3 is, when the pressure head exerted pressure to the upside dowel steel, huge pressure can make upside dowel steel 1 produce the deformation that the middle part is outstanding downwards, if upside dowel steel is direct to contact with each force transducer, the upside dowel steel of deformation can make each force transducer receive a lateral force, and influence force transducer's measurement accuracy. In the invention, although the upper force transmission plate 1 can deform, the force transmission strip with the arc-shaped top can ensure that the upper force transmission plate can deform smoothly without stress concentration, and meanwhile, the lateral force generated by deformation is transmitted to the lower force transmission plate 6 through the force transmission strip, and the force transmission strip 3 is positioned right above the opposite stress sensor, so that the acting force of the force transmission strip 3 on the lower force transmission plate 6 passes through the top stress point 4 in the direction, and the lower force transmission plate cannot deform, thereby ensuring that the force sensor can accurately measure the force value. Item 20 in the figure represents a ball joint transfer head arranged between the ram and the upper transfer plate.

In other embodiments of the present invention, the number of the force sensors connected in parallel may also be set as required, for example, five, six or other numbers according to the magnitude of the output pressure value of the press to be measured.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.