JPS5818614B2 - Weighing device with safety device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weighing device with a safety device using a donkey pal mechanism and a load cell.The purpose of the present invention is to have a simple configuration with few failures, and to prevent the load cell from being shocked during transportation. It is an object of the present invention to provide a weighing device which prevents overload from being applied during weighing.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

That is, the donkey pal mechanism 1, the load cell 2, and the safety device 3.
The donkey pal mechanism 1 consists of a pair of support rods 6° 7 which are fixed to the fixed wall 4 and the hopper 5 and are parallel to each other at a constant interval, and a pair of support rods 6 and 7 that are opposed to each other. A pair of mutually parallel leaf springs 8 arranged between both ends of the
A pair of brackets 9 and 10 are provided protruding from both support rods 6 and 7, facing each other in the vertical direction at appropriate intervals, and the load cell 2 is fixed on the lower bracket 10, and the upper bracket is fixed to the lower bracket 10. 9 is provided with a load transmitting protrusion 11 that comes into contact with the sensing protrusion 2a of the load cell 2, and the safety device 3 is connected to a female threaded portion 9a formed on the upper bracket 9, and a threaded rod that is screwed into the female threaded portion 9a. 12 and an upwardly widening tapered hole 1 formed in the lower bracket 10.
3, and a cone portion 12a formed at the tip of the threaded rod 12 and capable of being fitted into and removed from the tapered hole 13.

Reference numeral 14 denotes a spacing adjustment flange that is screwed onto the threaded rod 12, and is used to adjust the amount of protrusion of the threaded rod 12.

15 is a lock nut.

The load transmitting projection 11 is composed of a threaded rod 16 with a head that is screwed into a female threaded portion formed on the upper bracket 9, and a lock nut 17 that is screwed into the threaded rod 16.

The operation of the above configuration will be explained.

First, when transporting this weighing device, the threaded rod 12 is projected, the cone portion 12a is press-fitted into the tapered hole 13, and the plate 8 is pressed into place.
Slightly bend the support rod 7 on the hopper 5 side and lift it in the direction.

Then, as shown in Fig. 3, the sensing protrusion 2 of the load cell 2
Since the load transmitting protrusion 11 is separated from a, even if a slight shock is applied to this weighing device during transportation, the shock will not be applied to the load cell 2, and there is no fear that this load cell 2 will be damaged. Plate 8 also screw rod 1
Since the cone portion 12a of No. 2 is in the tapered hole 13,
There is no risk of buckling.

When weighing, the threaded rod 12 is loosened and a predetermined amount of the cone portion 12a is removed from the tapered hole 13 as shown in FIG. 2, and the protrusion 11 is brought into contact with the sensing protrusion 2a of the load cell 2.

Then, due to the weight of the heavy object thrown into the hopper 5,
The support rod 5 is lowered against the leaf spring 8, and a load is applied to the sensing protrusion 2a of the load cell 2 via the bracket 9 and the protrusion 11, thereby measuring the weight.

Is the amount of the cone portion 12a removed the same as the maximum displacement position of the sensing protrusion 2a in the weighing range of the load cell 2?
At least keep it small (.

Therefore, it is thrown into the hopper 5. If the load of the heavy object to be weighed exceeds the weighing range of the load cell 2, the cone portion 12 is removed before the load cell 2 is damaged.
a is in contact with the inner wall surface of the tapered hole 13, and the load cell 2
There is no risk of overloading.

In addition, the flange 14 and the top. By adjusting the distance between the side bracket 9 and the threaded rod 12 until the flange 14 hits the bracket 9, the amount of the cone portion 12a that can be removed from the tapered hole 13 becomes appropriate, which is very convenient. It is.

In addition, the weight shown in Figure 2 is particularly important. Even when the cone part 1
If 2a is placed inside the tapered hole 13,
Even if the plate spring 3 is bent due to buckling and the support rod 7 on the hopper 5 side approaches the support rod 6 on the wall 4 side, the cone portion 12a will come into contact with the inner wall surface of the tapered hole 13. Buckling can be prevented.

Note that the cone portion 12a and the tapered hole 13 in the above embodiment
Alternatively, as shown in FIG. 4, the tips of the threaded rods 12 may be formed into columnar shapes with the same diameter, and the flanges 18 may be provided at the tips, and the diameters of the holes 19 into which these tips fit may be made the same.

In this case, shock and overload during transportation and weighing are prevented by the flange 18 hitting the bracket 10, and buckling of the leaf spring 8 is prevented by the tip of the threaded rod 12 hitting the inner wall surface of the hole 19. be done.

Furthermore, it goes without saying that another weighing container can be attached in place of the hopper 5 in the above embodiment.

As described above, according to the weighing device with a safety device of the present invention, since a stopper is provided as a safety device to prevent both brackets from coming closer than a predetermined distance, shocks during transportation and overloads during weighing are provided. The load cell can be protected from

Also, since a hole is formed in the bracket facing the tip of the threaded rod and the tip of the threaded rod is loosely fitted into the hole,
When the plate attempts to buckle due to overload, the tip of the threaded rod comes into contact with the inner peripheral surface of the hole to prevent the plate from buckling.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of the present invention, with Figure 1 being an overall front view, Figure 2 being a front view of the main parts, and Figure 3 being a front view of the main parts showing the state during transportation. , FIG. 4 is a sectional view of a safety device portion showing another embodiment of the present invention. 1... donkey pal [, 2... load cell, 2a sensing protrusion, 3... safety device, 4...
...Fixed wall, 5...Hopper, 6,7...
...Support rod, 8...Plate spring, 9.10...
...Bracket, 9a...Female thread part, 11...
...Load transmission protrusion, 12...Threaded rod, 1
2a... Cone part (stopper), 13...
...Tapered hole, 18...Tsuba (stopper), 19
...hole.

Claims (1)

[Claims] 1 A weighing device consisting of a donkey pal mechanism, a load cell, and a safety device for preventing overload of the load cell and buckling of a leaf spring, in which the donkey pal mechanism is supported by a pair of supports parallel to each other at a constant interval. It consists of a rod and a pair of mutually parallel leaf springs disposed between the opposing ends of both support rods, and a pair of brackets are provided on both support rods facing each other in the vertical direction at an appropriate interval. A load cell is fixed to one bracket, a load transmission protrusion that contacts the sensing protrusion of the load cell is provided to the other bracket, and the safety device is connected to a female threaded portion formed on one of the brackets. and a threaded rod that is screwed into the female threaded portion.
a stopper provided on the threaded rod to prevent the two brackets from approaching each other beyond a predetermined distance; a hole is formed in the bracket opposite to the tip of the threaded rod, and the tip of the threaded rod is inserted into the hole. A weighing device with a safety device characterized by loose fitting.