JPH0112174Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a weight measuring device with an overload prevention device that measures weight by converting a load into an electrical signal using a transducer.

This type of device is equipped with a hanging member that is held by two pairs of check links parallel to each other in at least two different vertical planes and deflected in the vertical direction, and the object to be measured is placed on a receiving tray. transmits a load corresponding to the weight of the transducer to the transducer,
This measures the load electrically, and an example of a conventional overload prevention device is shown in FIG. That is, reference numeral 1 denotes a base, and a transducer 4 is fixedly attached to a mounting portion 2 formed in a bulge on the base 1 with a screw 3. This transducer 4 is provided with a pivot-shaped pressure-receiving part 5 that receives the load from the suspended member, and two elliptical holes 6 are wrapped in the central part to create distorted parts 7, 8, two upper and lower parts. 9 and 10 are formed, and strain gauges 11, 12, 13, and 14 forming a bridge circuit are attached to each strain portion 7-10. Further, a screw stopper 15 is screwed onto the base 1 and the transducer 4 with a slight gap therebetween, while being prevented from rotating by a lock nut 16. A bellows 17 protects the strain gauges 7 to 10 from harmful external atmosphere. Therefore, when an overload is applied to the pressure receiving part 5 of the transducer 4, the transducer 4 is supported by the stopper 15, thereby preventing permanent deformation of the strained parts 7 to 10. be. However, with this type, the distance between the transducer 4 and the stopper 15 cannot be adjusted until after the transducer 4 is fixed to the base 1, which complicates the assembly process and This must be adjusted each time the transducer 4 is rearranged.

The object of this invention is to provide a weight measuring device with an overload prevention device that can solve the above-mentioned drawbacks.

This invention includes a transducer that has a pressure receiving part that receives a load from a suspended member that is held so as to be freely deflectable in the vertical direction while holding a receiving plate, and a strain part that is provided with a strain gauge; A stopper base to which a stopper for limiting the amount of deformation is screwed so as to freely adjust the amount of protrusion is provided, the stopper base and the transducer are combined to form a unit body in which the stopper is positioned, and this unit body is used as the base. It is characterized by the fact that it has been installed. In other words, since the transducer is connected to the stopper base, the distance between the stopper and the transducer can be adjusted before assembling it to the base, simplifying the work by separating the adjustment work and the assembly work to the base. In addition, by preparing a unit body in which the distance between the transducer and the stopper is adjusted, even when replacing the transducer mounted on the base, you can simply replace the unit body. This structure eliminates the need for troublesome adjustment work after assembly.

A first embodiment of this invention will be explained based on FIGS. 2 and 3. Components that are the same as those described in FIG. 1 are designated by the same reference numerals, and description thereof will be omitted (the same applies hereinafter). 18 is a stopper base. The stopper base 18 includes a receiving plate 19 facing the lower surface of the transducer 4, and a holding portion 20 that is connected to the receiving plate 19 and holds the transducer 4. The receiving plate 19 has a pressure receiving portion. A stopper 15 located directly below the lock nut 16 is screwed into the lock nut 16 while being prevented from rotating. These transducer 4 and stopper base 18 are integrally connected by screws 3, thereby forming a unit body 21.

In such a configuration, permanent deformation of the strained parts 7 to 10 due to overload can be prevented by adjusting the gap between the transducer 4 and the stopper 15. Since the stopper base 18 and the stopper base 18 are combined, this can be done before attaching it to the base 1.
For attachment to the base 1, the stopper base 18 and the base 1 are attached using screws 22. In this way, the installation work to the base 1 and the adjustment work can be separated, thereby simplifying each work and making it easier to perform the work. Furthermore, by preparing the adjusted unit body 21, even when replacing the transducer 4 attached to the base 1, it is only necessary to replace the unit body 21, thereby eliminating the troublesome adjustment work after assembly. There's no need to do it.

Next, a second embodiment of this invention will be explained based on FIGS. 4 and 5. A frame 23 is fitted to the tip of the transducer 4 so as to be movable in the vertical direction, and a pressure receiving section 5 is provided on the upper surface of the frame 23. Further, the stopper 15 is connected to the frame body 23.
It faces the lower surface of with a slight gap. Therefore, the adjustment work for the gap is performed in the same manner as in the previous embodiment. If an overload is applied to the pressure receiving section 5, the stopper 15 will support the transducer 4 via the frame 23. That is, since the transducer 4 is not directly subjected to the reaction force from the stopper 15, permanent deformation of the strained parts 7 to 10 is more effectively prevented.

6 and 7 show a third embodiment of this invention. The transducer 4 used in this embodiment has an arm portion 24 extending on both sides at the tip of its upper surface.
A pressure receiving part 5 is formed at the center of this arm part 24. Further, the stopper 15 faces the lower surfaces of both sides of the arm portion 24 thereof.

Therefore, when an overload is applied to the pressure receiving part 5, the transducer 4 is supported by the stopper 15;
Although the reaction force caused by the stopper 15 is concentrated on the arm portion 24, its effect on the main portion where the strained portions 7 to 10 are formed is extremely small. Thereby, permanent deformation of the strained parts 7 to 10 can be more effectively prevented.

As described above, in this invention, since the transducer is combined with a stopper base having a stopper, the distance between the stopper and the transducer can be adjusted before assembly to the base, and the adjustment work and assembly to the base are easy. It is possible to simplify the work by separating the transducer and the stopper, thereby making each adjustment and assembly work easier and reducing the number of man-hours. By preparing the transducer, even when replacing the transducer attached to the base, it is possible to eliminate the need for troublesome adjustment work after assembly by simply replacing the unit body.

[Brief explanation of the drawing]

Fig. 1 is a side view of the conventional device, Fig. 2 is a side view showing the first embodiment of this invention, Fig. 3 is its front view,
Fig. 4 is a partially sectional side view showing a second embodiment of this invention, Fig. 5 is a front view thereof, Fig. 6 is a side view showing a third embodiment of this invention, and Fig. 7. is its front view. 1...Base, 4...Transducer, 5...
...Pressure receiving part, 7-10... Strain part, 11-14... Strain gauge, 15... Stopper, 18... Stopper base, 21... Unit body.

Claims (1)

[Scope of utility model registration request] A transducer that has a pressure receiving part that receives a load from a suspended member that is held so as to be freely deflectable in the vertical direction while holding a receiving tray, and a strain part that is provided with a strain gauge, and that limits the amount of deformation of this transducer. A stopper base is provided, to which a stopper is screwed together so that the amount of protrusion can be freely adjusted, the stopper base and the transducer are combined to form a unit body in which the stopper is positioned, and this unit body is attached to the base. A weight measuring device with an overload prevention device.