JPS5984120A - Apparatus for protecting weight detector - Google Patents

Abstract

PURPOSE:To prevent a breakage of the titled device by interposing a spring plate at the middle point in the longitudinal direction of a balance bar and providing a stopper which supports the balance bar at overload time near the top end of the hook side. CONSTITUTION:A weight detector 4 is connected to the other end of the balance bar 2a supported intermediately by a fulcrum 1 and having a hook 3 at one end. The spring plate 7 is provided interposing at the middle point in the longitudinal direction of the bar 2a, and the stopper 8 supporting the balance bar 2a at overload time is provided near the hook 3 side of the bar 2a for the protection of the detector 4. Thereby, the overload to the detector 4 is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a protection device for a weight detector, and more particularly to a protection device for a weight detector connected to the other end of a balance bar that is intermediately supported by a fulcrum and has a hook at one end. It is related to.

FIG. 1 shows a conventional example of a weight detection device. As shown in the figure, the weight detection device consists of a balance bar 2 intermediately supported by a fulcrum 1, a hook 3 provided at one end of the balance bar 2, and a hook 3 provided at the other end of the balance bar 2. It is composed of a weight detector 4.

When measuring the weight of a liquid with the weight detection device configured in this way, the liquid bag 5 is used for measurement, but if there is no liquid in the liquid bag 5 before measuring the liquid weight, the liquid The bag 5 is hung on the hook 6 and liquid is poured into it from the liquid inflow tube 6. As the liquid is poured, the weight detector 4 operates and displays the weight, but if the weight measured in this case is outside the specification range of the weight detector 4, the weight detector 4 will be damaged by the amount of overcurrent. In addition, when hanging a liquid bag 5 containing a certain amount of liquid on the hook 6, there is a risk that the operating range may be outside the specification range of the weight detector 4 due to shock when hanging, and the weight detector 4 may be damaged. was there.

An object of the present invention is to eliminate the fear of breakage.

! The present invention provides a protection device for a Li quantity detector.

That is, the present invention provides a weight detector which is intermediately supported by a fulcrum and connected to the other end of a balance bar having a hook at one end, and a temporary spring interposed in the longitudinal direction of the balance bar. This is characterized in that a stopper is provided near the tip of the parr on the hook side to receive the balance parr when it is overweight to protect it.

The present invention will now be explained based on the illustrated embodiments.

An embodiment of the invention is shown in FIGS. 2 and 3. Note that parts that are the same as those in the conventional model are given the same reference numerals, and therefore their explanations will be omitted. In this embodiment, it is intermediately supported by the fulcrum 1,
And that - hook 6 on the edge of the blade? f - balance par 2 with
A weight detector 4 is connected to the other end of the balance par 2a, and a leaf spring 7 is interposed in the longitudinal direction of the balance par 2a, and the balance par 2a when overweight is placed near the 7th gear 6 side of balance/<-2a. A stopper 8 is provided for protection. By doing so, it is possible to prevent excessive weight from being applied to the weight detector 4, and it is possible to obtain a protection device for the weight detector 4 that eliminates the fear of damage.

In the figure, 9 is a weight detector mounting screw, 1o is a weight detection adjustment nut, 11 is a fulcrum holder, 12 is a fulcrum holder mounting screw, 16 is a stopper holder, 14 is a stopper holder screw, 15 is a liquid, 16 17 is a balancer base, 17 is a plate spring mounting screw, and 18 is a signal proportional to the weight when weight is applied to the weight detector 4 via the balancer 2a as indicated by the solid line arrow in the figure. This is a weight signal line that outputs "analog".

That is, as shown in FIG. 4, the length L of the leaf spring 7 interposed in the middle in the longitudinal direction of the balancer is 20mm, the width is 100111111, the thickness 11 is 0.5-, and Young's modulus E
If it is 2000 [Jk No.-2, one edge of this temporary spring 7 is used as a support, and the other end is the overweight P-1, as shown by the solid arrow in the figure, when 9 is added to 5. The deflection amount Δδ of the leaf spring 7 is 61 from Δδ=PL3/l2h3! j
12 According to approximately 1.9++n. Therefore, the distance Δδ0 (see Fig. 2) between the balance par 2a and the stopper 8 is set to 1.9.

An excess weight of 9 or more is applied to the levers 1 and 5: p-)-C also prevents the temporary spring 7 from being bent by 1.9 or more with the stopper 8, preventing damage to the -61 weight detector. Then a tortoise is formed. Since damage to the weight detector can be prevented in this way, the operating range and specifications of the weight detector can be made the same. For example, when the weight to be measured is from 0 to 2 to 9, it is not necessary to use a 0 to 5 kq weight detector, but a 0 to 2 kg one can be used, and the sensitivity during weight measurement can be improved. Also stopper 8
When the balance par 2a comes into contact with the balancer 2a (see Figure 2),
If you take out the electrical signal, it becomes a weight limiter (limitation detector)
It can be used as

The liquid may be fed into the liquid bag in the following manner. That is, as shown in FIG. 5, a pump is attached to a mold plate measuring device which is composed of an MR detection device 19, a liquid bag 5, a liquid inflow tube 6, a tubing pump 20, a container 21 containing a liquid 15 to be measured, and the like. A controller 22 is provided, and the weight detector ft, 19 and the tubing pump 20 are connected via this pump controller 22. In this way, the liquid 15 in the container 21 is sent to the liquid bag 5 by the tubing pump 20 via the liquid inflow tube 6, and the weight output signal of the sent liquid 15 is detected by the weight detection device 19. The information is transmitted to the pump controller 22, and when the set weight set in the pump controller 22 is reached, the chaping pump is automatically activated.

20 is stopped, the feeding of the liquid bag 5-\ of the liquid 15 is stopped, and feeding of an excessive weight is prevented.

As described above, the present invention prevents the weight detector from being overloaded for more than a predetermined number of shifts, thereby preventing the weight detector from being damaged. You can get extra equipment.

[Brief explanation of the drawing]

Fig. 1 is a side view of the principle of a weight detection device of a conventional weight detector protection device, Fig. 2 is a side view of the principle of an embodiment of the weight detector protection device of the present invention, and Fig. 5 is a side view of the principle of an embodiment of the weight detection device of the present invention. FIG. 4 is a side view of the example, and FIG. 4 is an explanatory diagram illustrating the state of use of the temporary spring according to the embodiment. FIG. 5 is a system diagram for feeding the measuring liquid into the liquid bag according to the embodiment. 1...Fully point, 2a...Balance, (,3...Hook, 4...Weight detector, 5...Liquid), 7.
...Plate spring, 8...Stock spring 115...Liquid. [Name of applicant: Hitachi Koki Co., Ltd. Figure 1, Figure 2, Figure 4, Figure 5

Claims (1)

[Claims] 1. A weight detector is connected to the other end of a balance bar which is intermediately supported by a fulcrum and has a hook at one end thereof, with a leaf spring interposed in the longitudinal direction of the balance bar, and A protection device for a weight detector, characterized in that a stopper is provided near the hook-side tip of the balance bar to receive the balance bar when it is overweight.