JPH041532A - Weight measuring instrument - Google Patents

Abstract

PURPOSE:To improve the waterproofness by sensing weight by a liquid pressure means. CONSTITUTION:When a body F to be measured is mounted on the mount base 1 of a weight measurement part S, the liquid pressure of working oil which is charged varies since pipes 2 and 3 for sensing which are made of elastic materials such as rubber project slightly from the base 1, and variation in the pressure in a main communication pipe 24 is read by the pressure sensor 41 of a data reception part R and converted into an electric signal. Then an A/D converting circuit 42 converts the electric signal (analog value) into a digital value, which is modulated by a transmitting circuit 43 to send data through a transmitting antenna 44. A weight display part D receives the data by a receiving circuit 52 through a receiving antenna 51 and demodulates the data into the original digital value, and an arithmetic circuit 53 decides and calculates the data and outputs display data and a control signal to an LCD driving circuit 54 to display the weight value on LCD 55. Thus, a mechanical movable part is eliminated to improve the waterproofness.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a weight measuring device used in a scale, etc., and is particularly characterized by a weight sensing means.

[Conventional technology]

Conventional weight measuring devices of this type have a structure in which a required number of columns are erected on the bottom of the casing as weight sensing means, and a mounting table is supported by the tops of these columns. A strain gauge detects the compressive strain of the support column when an object to be measured is placed thereon, and a weight display means appropriately displays the measured weight.

[Problem to be solved by the invention] However, in such a conventional weight measuring device,
Since the mounting base needs to be moved relative to the casing by a mechanical structure, these cannot be constructed in one piece, and as a result, it is difficult to seal such movable parts, making it difficult to use in humid places. It had

An object of the present invention is to eliminate such disadvantages.

[Means to solve the problem]

In order to solve the above problems, in a weight measuring device according to the present invention, the weight sensing means senses weight and the sensed weight is displayed by a weight display means. This method was adopted.

[Action of the invention]

Since the weight measuring device according to the present invention is configured as described above, that is, since hydraulic pressure means is adopted as the weight sensing means, mechanically movable parts can be eliminated, and as a result, waterproofness can be easily improved. It is.

[Explanation of Examples]

Hereinafter, the present invention will be explained in detail based on FIGS. 1 to 7.

In FIGS. 1 and 2, S is a weight measuring section of the weight measuring device W, R is a data receiving section thereof, and D is a weight display section.

In the weight measuring section S, reference numeral 1 denotes a mounting table made of synthetic resin, and is formed into a substantially rectangular shape. The object to be measured F is placed on this mounting table 1 (see FIG. 3). Reference numerals 11 and 12 denote insertion holes, which are formed in the mounting table 1 in the horizontal direction. These insertion holes 11 and 12 are opened in the shape of a long hole 11L121 on the back surface (of the mounting table 1). Also, 112, 12
Reference numeral 2 denotes an auxiliary insertion hole, which is connected to the insertion holes 11 and 12 with their axes aligned with each other. The auxiliary insertion holes 112 and 122 are open on the side wall surface of the mounting table 1.

2.3 is a sensing pipe made of rubber (corresponding to the "weight sensing means" of the present invention), and is press-fitted into the insertion hole ILI2 from the direction of the elongated hole 11L121. In this press-fitted state, the sensing vibrator 2.3 is inserted into the elongated hole 111.
It protrudes slightly from 121. In addition, the sensing vibe 2
．． 3 may be made of an elastic material other than rubber. Reference numeral 21 and 31 denote shaft holes, which are formed in the sensing vibrator 2 so as to be eccentric from the shaft center toward the surface of the mounting table 10. This shaft hole 21.31 is filled with hydraulic oil (corresponding to the "liquid king means" of the present invention). Incidentally, reference numerals 22 and 32 are leg portions of the protrusions, which are integrally molded with the sensing vibrators 2 and 3. This leg 22
．． 32 protrudes downward from the mounting table 1 to improve the stability of the weight measuring section S. Further, reference numeral 13 denotes a long groove, which is formed approximately at the center of the back surface of the mounting table 1.

This long groove 13 is provided to reduce the weight of the mounting table 1.

Next, 23.33 is a communication pipe, and the sensing vibe 2
．． 3 is integrally formed. The communication pipes 23 and 33 pass through the auxiliary insertion holes 112 and 122 of the mounting table 1 and protrude to the outside of the mounting table 1. Then, the two-way communication pipes 23 and 33 join together via the pipe joint 231 and communicate with the main communication pipe 24.

Reference numeral 41 denotes a pressure sensor of the data receiving section R, which reads changes in the hydraulic pressure of the liquid in the main communication pipe 24 and converts it into an electrical signal (analog value). 42 is an A/D conversion circuit which converts the electric signal (analog value) into an n-bit digital value (serial data). A transmitting circuit 43 modulates the digital value (serial data) and transmits the data. Note that 44 is a transmitting antenna.

Reference numeral 51 indicates a receiving antenna for the weight display section, and 52 indicates a receiving circuit thereof. This receiving circuit 52 receives data via the antenna 51 and converts it into original serial data by demodulating it. 53 is an arithmetic circuit that determines and calculates the demodulated data and outputs display data and control signals to the LCD drive circuit 54; 55 is an LCD (liquid crystal display element) that outputs control signals and control signals from the arithmetic circuit 53; Calculate the weight value according to the displayed data.

Here, the flow of the arithmetic circuit 53 will be explained according to FIGS. 3 and 4.

- First, it is determined whether weight data has been received.

(1) If 0 weight data is received, input the data using the serial port.

(2) If no weight data is received, it is determined whether weight data is received again.

・Next, determine whether there are any abnormalities in the data input on the serial port (parity check, stomp access check).

(1) If there is no abnormality, it is determined whether the received data>φkg data.

(2) If there is an abnormality, the reception of weight data is determined again.

・As a result of determining whether the received data is φSatoshi data, (1
), if the received data>φ word data, the received data is converted into weight data using the weight data map.

(2) If the received data is not φ word data, it is determined again whether weight data is received.

・Next, it is determined whether the tare weight subtraction mode is on or not.

(1) In the case of tare weight subtraction mode, (weight data) (tare weight cancellation data) is calculated. (2) When not in tare weight cancellation mode, the above calculation is omitted.

- Next, determine whether the data is the same as the previous data.

(1) If the data is the same as the previous data, it is determined whether the weight data is received again.

(2) If the data is not the same as the previous data, the contents of the display data memory are rewritten.

- Next, it is determined whether or not the mode is to hold the data on the display screen.

(1) If the mode is to hold, it is determined whether weight data is received again.

(2) If it is not the hold mode, the display weight signal and control signal are output to the LCD drive circuit.

-Then, the weight data is displayed or updated on the LCD screen.

・After that, the reception of weight data is repeated.

It can also be terminated.

5 and 6 show a second embodiment, in which the mounting table 1 and the shaft hole 2L31 are connected to each other by an elastic material (such as rubber).
It is integrally formed with. P is a reinforcing plate made of synthetic resin, and is buried horizontally inside the mounting table 1.

Further, reference numeral 61.71 denotes a connecting pipe portion, which is integrally formed around the opening periphery of the shaft hole 2L31 of the mounting table 1. Reference numeral 232 denotes an auxiliary pipe joint, which connects the connecting pipe section 61 and the communicating pipe 81. This communication pipe 81 joins the hydraulic oil in both shaft holes 21 and 31 via a vibration joint 231 and communicates with the main communication pipe 24 .

[Effects of the Invention] The weight measuring device according to the present invention senses weight by a weight sensing means and displays the sensed weight by a weight display means, since a hydraulic means is adopted as the weight sensing means. , As a result of being able to eliminate mechanically moving parts, it is easy to improve waterproofness.

Therefore, by using this weight measuring device, it is possible to easily measure weight with high accuracy even in a humid place.

[Brief Description of the Drawings] Fig. 1 is a partially sectional plan view of an embodiment of the weight measuring device according to the present invention, Fig. 2 is a sectional view taken along the line II-II in Fig. 1, and Fig. 3 is an explanation of the principle of operation. 4 is a flowchart of the arithmetic circuit in FIG. 3, FIG. 5 is a diagram of a second embodiment corresponding to FIG. 1, and FIG. 6 is a sectional view taken along the line Vl--Vl in FIG. 1st station W...Weight measuring device S...Weight sensing means D...Weight display means

Claims (1)

[Claims] (1) A weight measuring device that senses weight with a weight sensing means and displays the sensed weight with a weight display means, characterized in that a hydraulic means is adopted as the weight sensing means.