JPS6319786Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to a weighing device, and specifically relates to an improvement of a weighing device using a load cell.

(Conventional technology and its problems) The conventional weighing device has a load cell 1 as shown in Figure 5.
The fulcrum side 2 of the load cell 1 is fixed to the base 4, and the load cell 1
A pan support plate 6 is provided on the load side 3 of the weighing pan 7 via a mounting member 5, and a buffer member 8'' is provided on the pan support plate 6 to support the weighing pan 7.

If an impact is applied to the weighing pan 7, the buffer member 8''
Although the impact is relieved by the above, if the overload is not limited by a stopper between the plate receiving plate 6 and the base 4, the load cell 1 will be deformed and the accuracy will deteriorate. Therefore, the stopper clearance of stoppers 9″ and 10″
SC is the critical deviation of the load cell, that is, the maximum deviation that the load cell 1 can maintain accuracy (e.g. 0.2 to 0.3 mm)
However, since the critical deviation is a very small value, it takes a lot of effort and time to set the stopper clearance (SC).

Therefore, as a solution to the above-mentioned problems, a device described in Japanese Utility Model Application Publication No. 137030/1983 has been proposed.

This idea is based on a hemispherical elastic body (rubber material) placed near the four corners of the upper surface of the support plate attached to the moving side of the load cell, and a weight receiving plate fixed to the top of the elastic body with screws. The base is fixed, and overload prevention stoppers are provided near the four corners and at the center of the base plate. With the above-mentioned configuration, the gap between the overload prevention stopper and the receiving plate is reduced by the amount of deflection of the elastic body. Adjustment is easy because it can be adjusted with consideration.

However, the elastic body has a hemispherical shape because it needs to flex and deform under a considerable load.
Therefore, the elastic body is a molded product, which has the problem of high cost.

(Purpose of the invention) In view of the above-mentioned conventional circumstances, it is an object of the present invention to provide a measuring device that can easily set a stopper clearance even when using an inexpensive buffer member.

(Structure of the invention) The technical means taken by the invention to achieve the above object is to fix the fulcrum side of the load cell to a rigid base, and attach a mounting member with an approximate planar shape to the load side of the load cell. At the same time, a band-shaped tray receiving plate is disposed on the upper surface of both sides of the mounting member via a flat buffer member, and a buffer member and a plate-like plate are placed in a hole opened between the buffer member and the plate receiving plate. A plate receiving plate that is fitted with a rigid collar that is approximately the same length or longer than the total thickness of the plate receiving plate, is fitted with a bolt into the collar, and is screwed and fixed to a mounting member, and is arranged in parallel. A plate holder for mounting a weighing plate is attached to the upper surface of each end of the base, a stopper is attached hanging down to the lower surface of the base, and a fixed stopper is disposed at a predetermined position on the base opposite to the stopper.

(Function) According to the above configuration, the flat buffer member interposed between the mounting member and the tray receiving plate is compressively deformed by the load that the tray receiving plate receives, and returns to its original state when the load is removed. However, since the buffer member and the tray support plate are supported by a collar that fits into the holes made in both plates, they move up and down using the collar as a guide, and the fixing bolt inserted into the collar moves up and down. The shock absorbing member and the tray receiving plate are no longer caught on the shaft.

(Embodiment) To explain the embodiment of the present invention with reference to the drawings, 1
is a load cell, and a base 4 is fixed to the fulcrum side 2. The base 4 has L-shaped rails arranged in parallel and is formed into a substantially H-shape by crossing steel materials, and is provided with a bottom protection plate for the load cell 1, and fixed stoppers 10 are arranged at each of the four corners.

Next, a mounting member 5 is provided on the load side 3 of the load cell 1, and a plate receiving plate 6 is provided in parallel. The mounting member 5 has L-shaped rails arranged in parallel and a steel material on the end side to form a substantially U-shape, and each mounting hole is drilled therein.
That is, a flat buffer member 8 is placed on top of the mounting member 5, and the plate receiving plate 6 is placed thereon, so that the buffer member 8 is sandwiched between the mounting member 5 and the plate receiving plate 6.

A plate receiving plate 6 and a buffer member 8 for the mounting member 5
For installation, make holes 1 in the tray receiving plate 6 and the buffer member 8, respectively.
4 and 14' are opened, and a rigid collar 15 that is the same length as the total thickness of the plate receiving plate 6 and the buffer member 8 or longer is fitted across both holes 14 and 14'. , the bolt 13 is screwed onto the mounting member 5 through the collar 15 and fixed. That is, the lower surface of the head of the bolt 13 abuts against the upper end surface of the collar 15 to complete the screwing, and the buffer member 8 is prevented from being compressed and deformed, and the plate receiving plate 6 is prevented from being tilted due to the unbalanced load. At this time, the inner surfaces of the holes 14 and 14' of the plate receiving plate 6 and the buffer member 8 are prevented from being caught on the shaft portion of the bolt 13.

In addition, the plate support plate 6 is formed into a band plate shape, and a plate support 12 is provided on the upper surface of the longitudinal end thereof, and a box-shaped weighing plate 7 is supported on a total of four plate supports 12. . Further, four corner stoppers 9 are provided at each end of the pan support plate 6, an intermediate stopper 9' is provided at the center of the pan support plate 6, and a fixed stopper 10 is provided at the end of the base 4 facing the four corner stoppers 9. do.

In the above embodiment, when a load is applied to one end of the weighing pan 7 and the weighing pan 7 is tilted, one end of the buffer member 8 contracts to buffer the load. In the case of overload, the amount of contraction of the buffer member 8 becomes large and the four corner stoppers 9 hit the fixed stoppers 10 to prevent the load cell 1 from being overloaded.

The amount of deviation of the four corner stoppers 9 at this time is much larger than that of the conventional example. That is, the stopper clearance SC between the four corner stoppers 9 and the fixed stopper 10
can be made larger than the conventional one, making adjustment extremely easy.

The buffer member in the present invention is an elastic body such as rubber, but it may also be a wave-shaped leaf spring, and it is also possible to include not only one piece but a plurality of pieces as desired. Furthermore, in order to increase the amount by which the elastic body bends, the surface of the elastic body may be provided with irregularities or protrusions may be provided at appropriate intervals.

(Effects of the invention) As described in detail above, the weighing device of the present invention fixes the fulcrum side of the load cell to a rigid base, attaches a mounting member with an approximate planar shape to the load side of the load cell, and attaches the mounting member to the load side of the load cell. A band-shaped tray receiving plate is disposed on the upper surface of both sides of the plate via a flat buffering member, and a hole opened between the buffering member and the tray receiving plate,
Fitting a rigid collar that is approximately the same length as or longer than the total thickness of the buffer member and the plate receiving plate, inserting a bolt into the collar and screwing it to the mounting member,
In addition, a plate holder for mounting a weighing plate is attached to the upper surface of each end of the plate receiving plates arranged in parallel, a stopper is attached hanging down to the lower surface, and a fixed stopper is arranged at a predetermined location on the base opposite to the stopper. Therefore, even if an inexpensive buffer member is used, the stopper clearance can be set to a large value, and the stopper clearance can be adjusted extremely easily.

Moreover, since the flat cushioning member and the plate-shaped receiving plate are fixed to the mounting member via the collar, the inner surfaces of the holes in the buffering member and the plate-shaped receiving plate do not come into direct contact with the shafts of bolts for tightening. Therefore, even when the plate receiving plate is tilted due to an unbalanced load being applied to the weighing pan, the plate receiving plate and the buffer member can move up and down smoothly using the collar as a guide, making stable measurement possible.

By doing so, we will reach our intended purpose.

[Brief description of the drawings]

Fig. 1 is an exploded three-dimensional view of the measuring device according to the first embodiment of the present invention, Fig. 2 is a three-dimensional view of the mounting member, Fig. 3 is an exploded three-dimensional view showing the mounting structure of the buffer member, and Fig. 4 is the same measuring device. FIG. 5 is a partially cutaway side view of FIG. 5, and FIG. In the figure, 1...load cell, 2...fulcrum side, 3...
...Load side, 4...Base, 5...Mounting member, 6...
...Dish receiving plate, 7...Measuring pan, 8, 8'...Buffer member,
9... Four corner stoppers, 9'... Intermediate stopper,
10...Fixed stopper.

Claims (1)

[Scope of utility model registration request] Fix the fulcrum side of the load cell to a rigid base,
A mounting member having an approximate planar shape is attached to the load side of the load cell, and a band-shaped plate receiving plate is disposed on the upper surface of both sides of the mounting member via a flat buffer member, and the buffer member Fit a rigid collar that is approximately the same length as or longer than the total thickness of the buffer member and the plate receiving plate into the hole opened between the buffer member and the plate receiving plate, and insert a bolt into the collar for installation. A plate holder for mounting a weighing plate is attached to the top surface of each end of a plate receiving plate which is screwed and fixed to the member and arranged in parallel, and a stopper is hung from the bottom surface of the plate holder, and a stopper is attached to the bottom surface at a predetermined location on the base opposite to the stopper. A weighing device equipped with a fixed stopper.