CN202853726U - Control system of tiltable weighing electronic scale - Google Patents

Abstract

The utility model discloses a control system of tilting electronic scale of weighing, including the balance body, be equipped with the display on the balance body and weigh the face, the internal weighing sensor who is used for measuring pressure and the angle detection device who is used for detecting the face gradient of weighing of the balance body that is provided with of balance, the internal weighing module treater that calculates the true weight of object according to the data that angle detection device and weighing sensor measured that still is equipped with of balance, display, weighing sensor, angle detection device are connected with the weighing module treater respectively. The utility model aims at compensating the pressure sensing value that the contained angle that becomes according to the weighing surface of the balance body and horizontal plane equals that the contained angle that the weighing surface received pressure and object gravity become comes the weighing sensor to read out, making current electronic weighing apparatus display value be close to actual object weight, and can not cause the measuring error to the actual weight of object because of the existence at angle of inclination.

Description

A Control System of Tiltable Weighing Electronic Scale

[technical field]

The utility model relates to a control system for a tiltable weighing electronic scale.

[Background technique]

At present, weighing instruments on the market must be placed on a flat table or kept in a horizontal state to weigh accurately, which greatly limits the environment in which weighing instruments can be used. And because it is difficult for the user to judge whether the weighing instrument product is level, the weighing of many products will be affected. At present, most of the methods to adjust the product level in the market are to use a level meter. Although the method is feasible, the adjustment process is cumbersome, and when the position is changed, it must be readjusted. Therefore, it is necessary to solve the above problems.

[utility model content]

The utility model overcomes the deficiencies of the above-mentioned technologies, and provides a control system for a tiltable weighing electronic scale. The inclination of the weighing surface of the scale body relative to the horizontal plane is detected by the inclination detection module, and the weighing sensor senses the object applied to the scale. For the pressure on the heavy surface, the controller compensates the pressure sensing value according to the principle of force analysis, so that the current electronic scale display value is close to the actual weight value of the object, and will not cause measurement errors in the actual weight of the object due to the existence of the inclination angle.

In order to achieve the above object, the utility model adopts the following technical solutions:

A control system for a tiltable weighing electronic scale, including a scale body 1, on which a display 2 and a weighing surface 101 are arranged, and in the scale body 1, there is a scale for measuring objects applied to the weighing surface 101 pressure load cell 3, angle detection device 4 for measuring the inclination of the weighing surface 101, and first calculate the angle between the weighing surface 101 and the horizontal plane 102 through the inclination data detected by the angle detection device 4 , and then according to the force analysis principle that the angle formed by the weighing surface 101 and the horizontal plane 102 is equal to the angle formed by the pressure direction of the load cell 3 and the direction of gravity of the object, the pressure sensing value of the load cell 3 is compensated and calculated The weighing module processor 5 that outputs the real weight of the object, the display 2, the load cell 3, and the angle detection device 4 are connected to the weighing module processor 5 respectively.

As an optimization, the angle detection device 4 adopts a triaxial acceleration sensor for detecting the inclination and outputting the component value data of the acceleration of gravity on the triaxial coordinates, and the output end of the triaxial acceleration sensor is connected to the weighing module processor 5 .

As an optimization, the angle detecting device 4 adopts a three-axis accelerometer acceleration sensor whose model is LIS35DE.

As an optimization, the angle detection device 4 adopts an inclination sensor for detecting inclination and directly outputting inclination value data.

The utility model can be used on spoon scales, and can also be used on measuring cup scales and luggage scales.

The working principle and process of the utility model are as follows: the object is weighed on the scale, and the weighing sensor detects the pressure exerted by the object on the weighing surface of the scale body, and outputs the pressure sensing value N to the weighing module processor;

The angle detection device measures the inclination of the weighing surface of the scale body, and outputs the inclination data to the weighing module processor to calculate the inclination value α;

称重模组处理器计算出物体实际重量，并把计算结果输出给显示模块进行显示。According to the force analysis, the angle α formed by the weighing surface of the scale body and the horizontal plane is equal to the angle formed by the pressure N on the weighing surface and the gravity G of the object, that is,

The weighing module processor calculates the actual weight of the object, and outputs the calculation result to the display module for display.

The beneficial effects of the utility model are: 1. It can be widely used in weighing instruments, such as spoon scales, and the level does not need to be adjusted during use, so as to avoid weighing problems caused by the inclination of the scale body; 2. It can be used in electronic measuring cup scales On the top, users can measure while pouring things, which is convenient and easy to use. 3. Applied to commercial electronic scales, users no longer need to repeatedly adjust the level of the scale body through the level meter.

[Description of drawings]

Fig. 1 is the physical schematic diagram of the present utility model.

Fig. 2 is a schematic structural view of the utility model.

Fig. 3 is a schematic diagram of the principle of inclined weighing of the utility model.

Fig. 4 is a schematic diagram of Embodiment 1 of the utility model.

Fig. 5 is a schematic diagram of finding an included angle of a tetrahedron.

Fig. 6 is a weighing flowchart of the utility model.

[Detailed ways]

Below in conjunction with accompanying drawing and embodiment of the present utility model, further describe in detail:

As shown in Figure 1-2, a control system for a tiltable weighing electronic scale is characterized in that it includes a scale body 1, and the scale body 1 is provided with a display 2 and a weighing surface 101, and the scale body 1 It is equipped with a load cell 3 for measuring the pressure exerted by an object on the weighing surface 101, an angle detection device 4 for measuring the inclination of the weighing surface 101, and firstly calculates the weighing by using the inclination data detected by the angle detection device 4. The angle formed by the weight surface 101 and the horizontal surface 102 is then determined according to the force analysis principle that the angle formed by the weighing surface 101 and the horizontal surface 102 is equal to the angle formed by the direction of pressure on the load cell 3 and the direction of gravity of the object. The weighing module processor 5 that compensates the pressure sensing value of the load cell 3 and calculates the real weight of the object, the display 2, the load cell 3, and the angle detection device 4 are respectively connected with the weighing module processor 5.

As shown in Figure 3, the inclination of the detection scale body 1 described in the utility model also refers to the inclination of the weighing surface 101 on the detection scale body 1, that is, the angle α formed between the weighing surface 101 and the horizontal plane 102, According to the force analysis, the inclination angle formed by the weighing surface 101 of the scale body and the horizontal plane 102 is equal to the angle formed by the N direction of the pressure on the load cell 3 and the G direction of the object's gravity, and the tilt weighing compensation relationship is obtained:

$\mathrm{<span\; class="notranslate">\; G</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; N</span>}}{\mathrm{<span\; class="notranslate">\; COS\&alpha;</span>}}$

Wherein G is the weight of the object, N is the pressure sensing value read by the load cell 3, and α is also recorded as the inclination value, and the actual weight of the object is calculated according to the above formula. Therefore, as long as the output signal of the angle detection device 4 is solved how to calculate The inclination value is fine.

Embodiment 1, the angle detection device 4 adopts a three-axis acceleration sensor, a three-axis acceleration sensor is a device for measuring the acceleration in three directions, which can measure the acceleration value of each axis, and then pass the output voltage signal or digital signal and the inclination value After the conversion, the relationship between the three-axis acceleration value output by the three-axis acceleration sensor and the inclination value is inferred below.

同理得出横滚角

而ADx、ADy、ADz由三轴加速度传感器读出，即称重模组处理器5可通过与其连接的三轴加速度传感器的输出信号计算出系统在各坐标轴上的倾角。As shown in FIG. 4 , the angle between the X axis and the horizontal plane is defined as a pitch angle Ax, and the angle between the Y axis and the horizontal plane is defined as a roll angle Ay. The following takes the pitch angle Ax as an example to deduce the calculation formula. When the acceleration sensor is placed horizontally on the horizontal plane, its initial state coordinates coincide with the X-axis, Y-axis, and Z-axis. At this time, Ax is 0 degrees, and the static acceleration values on each axis are: ADx=0g, ADy=0g, ADz= 1g; when the pitch angle Ax is generated between the X axis and the horizontal plane, which is the angle P shown in the figure, the coordinate system is projected onto the XZ axis plane, and the static acceleration value on each axis can be obtained: ADx=-1g×sin( Ax), ADy=0g, ADz=1g×cos(Ax), get the pitch angle

Similarly, roll angle

ADx, ADy, and ADz are read out by the three-axis acceleration sensor, that is, the weighing module processor 5 can calculate the inclination angle of the system on each coordinate axis through the output signal of the three-axis acceleration sensor connected thereto.

通过求反余弦可得出斜角值α，由于实际应用中倾斜称重的倾斜度是有限度的，在倾斜度过大的情况下是不能称重的，所述实际可以把斜角值α近似为α=Ax+Ay方便系统运算。As shown in Figure 5, according to the tetrahedron to find the included angle has

The inclination value α can be obtained by calculating the inverse cosine. Since the inclination of inclined weighing in practical applications is limited, it cannot be weighed when the inclination is too large. The actual value of the inclination angle α can be calculated It is approximated as α=Ax+Ay to facilitate system operation.

Embodiment 2, the angle detection device 4 adopts a three-axis accelerometer acceleration sensor whose model is LIS35DE. The LIS35DE three-axis acceleration sensor is a high-precision, low power consumption and practical IC chip three-axis acceleration sensor. The internal integrated control chip outputs acceleration value digital signal. As shown in Figure 4, the LIS35DE three-axis acceleration sensor uses the gravity vector as a reference to measure the spatial orientation of the object and measure the inclination. It is the most sensitive. At this time, the sensing axis X and Y axes are perpendicular to the direction of gravity, and the digital output on the X and Y axes remains linear with the inclination. When the sensing axis is nearly parallel to the direction of gravity, the LIS35DE three-axis acceleration sensor The acceleration output value sensed by the Z axis is close to +1g or -1g. Place the X and Y axes of the accelerometer horizontally. At this time, the output gravitational acceleration of the X and Y axes is 0, and it can be used as a dual-axis inclinometer to measure the inclination. Convert the measurement output digital signals ADx and ADy into the corresponding g Value variation G _X , G _Y , for LIS35DE:

G _X = (AD _X × 1g/64)

G _Y =(AD _Y ×1g/64)

The above formula reflects the internal conversion relationship between the output signal value of LIS35DE and the acceleration value. Substituting the following formula to calculate the inclination angles Ax and Ay of the X and Y axes,

Ax=G _X ×90/1g≈1.4ADx

Ay=G _Y ×90/1g≈1.4ADy

The above formula is the internal conversion relationship between the acceleration and inclination angle calculated by LIS35DE, in which the inclination data ADx, ADy, ADz are directly output by LIS35DE, and the inclination angle calculated according to α=Ax+Ay is proportional to the output acceleration value of LIS35DE The relationship provides a more convenient means for other types of angle detection devices 4 to perform tilt compensation on pressure measurement values, and also provides a reference for using other types of three-axis acceleration sensors.

就可以计算出物体实际重量。In Embodiment 3, the angle detection device 4 directly adopts an existing finished module inclination sensor on the market. The inclination sensor is a device used for level measurement of the system. It integrates the micro-control unit, micro-electro-mechanical system accelerometer, analog-to-digital conversion circuit, and communication unit on a very small circuit board, and directly outputs the inclination value α, etc. Inclination data, the angle detection device 4 integrates the calculation process of the inclination value in the module, which reduces the amount of calculation of the weighing module processor 5, and the weighing module processor 5 directly uses the output signal and according to the

The actual weight of the object can be calculated.

As shown in Figure 6, the object is weighed on the scale, and the load cell 3 detects the pressure that the object applies to the weighing surface 101 of the scale body, and outputs the pressure sensing value N to the weighing module processor 5; the angle detection device 4 Measure the inclination of the weighing surface of the scale body, output the inclination data to the weighing module processor 5 to calculate the inclination value α; the weighing module processor 5 calculates the actual weight of the object, and outputs the calculation result to the display 2 for display .

The utility model has many methods for measuring the inclination angle and carrying out inclination compensation, and there are many kinds of processing means for calculating the inclination value α by the inclination data detected by the angle detection device 4, and those skilled in the art can according to the output signal of the specific angle detection device 4 and For the mathematical relationship of the inclination angle value α, select a kind of approximate conversion formula that is convenient for operation and solidify it in the weighing module processor 5 in advance, thereby calculate the inclination angle value α, which does not affect the basic structure of the utility model and the effect of realization, as long as The detection device is used to detect the inclination data of the scale body, and the data related to the inclination angle value α and the measured value of the load cell 3 are used to compensate or correct the measurement error during inclination weighing, so as to calculate the actual weight of the object. Way, all is the protection domain of the present utility model.

The technology of the utility model can be widely applied to weighing apparatus products, especially spoon scales. The use of the spoon scale is: the user holds the spoon scale to weigh. If the weighing surface of the spoon scale is not level, the weighing accuracy cannot be guaranteed. If the level is adjusted through the level, it is quite inconvenient to use. If we apply This inclined weighing technology does not require horizontal adjustment, which brings a revolutionary leap in the ease of use and weighing accuracy of spoon scales.

In addition, it can also be used on measuring cup scales. The usage habit of measuring cup scales is: measure while pouring things. It is also difficult to ensure the level of the product during the measurement process, and it is quite troublesome to measure the product on the table after pouring something. If this tilt measurement technology is applied, it will also bring a qualitative leap in the convenience of use of the measuring cup scale.

The technical scheme of the utility model can also be applied to other weighing instruments such as luggage scales, which avoids the weighing problem caused by the unevenness of the weighing platform, and does not need to repeatedly adjust the level during use.

Claims (7)

1. the control system of a tiltable weighing electronic scale, it is characterized in that including scale body (1), described scale body (1) is provided with display (2) and the face of weighing (101), be provided with the LOAD CELLS (3) that imposes on the face of weighing (101) pressure for the measurement object in the described scale body (1), be used for measuring the angle detection device (4) of face (101) degree of tilt of weighing, and the degree of tilt data that detect by angle detection device (4) first calculate the angle that the face of weighing (101) becomes with surface level (102), then the angle that face (101) becomes with surface level (102) according to weighing equals the force analysis principle of the angle that LOAD CELLS (3) pressure direction becomes with the object gravity direction to be come the pressure sensitive value of LOAD CELLS (3) is compensated the module processor (5) of weighing that calculates the object actual weight, described display (2), LOAD CELLS (3), angle detection device (4) is connected with the module processor (5) of weighing respectively.

2. the control system of a kind of tiltable weighing electronic scale according to claim 1, it is characterized in that described angle detection device (4) adopts the 3-axis acceleration sensor for detection of the component value data of degree of tilt output acceleration of gravity on triaxial coordinate, described 3-axis acceleration sensor output terminal is connected with the module processor (5) of weighing.

3. the control system of a kind of tiltable weighing electronic scale according to claim 1 and 2 is characterized in that it is the triaxial accelerometer acceleration transducer of LIS35DE that described angle detection device (4) adopts model.

4. the control system of a kind of tiltable weighing electronic scale according to claim 1 is characterized in that described angle detection device (4) adopts the obliquity sensor for detection of degree of tilt and direct output inclination angle Value Data.

5. the control system of a kind of tiltable weighing electronic scale according to claim 1 is characterized in that described scale body (1) is spoon scale.

6. the control system of a kind of tiltable weighing electronic scale according to claim 1 is characterized in that described scale body (1) is the measuring cup scale.

7. the control system of a kind of tiltable weighing electronic scale according to claim 1 is characterized in that described scale body (1) is luggage scale.

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