JPH0353836Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to the field of presses, and particularly relates to an improved load cell integrated into the press.

(Prior technology) Load cells (strain gauge type load transducers) are
It converts weight, force, etc. into electrical output using a strain gauge, and depending on the purpose of use, this electrical output can be connected to various measuring instruments to enable weight indication, recording, and control.

Load cells are small, lightweight, highly accurate, and lightweight.
It has excellent features such as simple structure, easy maintenance and installation, and high responsiveness, and in recent years, along with the development of peripheral electronic technology and the trend towards labor saving and automation, it has been widely used in various industries.

FIG. 2 shows an example of the prior art, which is a power check press incorporating a load cell, and FIG. 3 is an enlarged view of the main part of FIG.

As shown in the figure, in the conventional press with a load cell, an independent load cell 1 is attached to the shank attachment part of the ram 3.
The configuration was such that jigs, etc., were attached to a.

(Problems to be solved by the invention) However, in the above conventional technology, the open height is reduced because the load cell is installed separately, and the shank portion is in two places, the upper and lower, so the jig does not tilt in response to eccentric loads. There were drawbacks such as a decrease in work accuracy.

The present invention was devised in view of these points, and aims to eliminate the above-mentioned drawbacks by making the strain-generating column of the load cell integral with a press.

(Means for Solving the Problems) The present invention, as shown in FIG.
, and attach the mounting seat 2C of the straining column 2 to the ram 3.
Fit into the mounting portion 3d of and tighten and fix with the fixing screw 5. In this way, the ram 3 of said press
In the strain-generating column 2 built into the cylindrical portion, the outer circumferential portion of the shank attachment portion 2a, which is a part of the structure, is slidably fitted with the inner circumferential portion of the tip portion 3b of the ram 3 with a minimum clearance. It is constructed by combining

(Example) Hereinafter, the present invention will be explained in detail based on the drawings.

In FIG. 1, the ram 3 of the approximately cylindrical press
1 includes a cylindrical portion 3a processed into a substantially cylindrical shape in order to attach the strain column 2 of the load cell, and the strain column 2.
The ram 3 consists of a shank attachment part 2a and a tip part 3b formed with an inner peripheral part that protrudes inward to maintain a minimum clearance, and the strain column 2 of the load cell is attached to the ram 3. A threaded hole 3C for attaching the shank, a hole 3e connected to the threaded hole 2d in the shank attachment part 2a of the strain-generating column 2 via a hole 6, and a hole 3e connected to the strain-generating part 2b. A hole 3f is provided through which a gauge cord 8 connected to the strain gauge 7 is inserted.

Next, the structure of the strain-generating column 2 of the load cell will be described. A shank is fitted to the inner circumference of the tip 3b of the ram 3, which is formed in a substantially cylindrical shape, so as to be slidable with a minimum clearance. part 2a, a substantially prismatic strain-generating part 2b integrally formed at the upper part of the shank mounting part 2a, and a substantially disc-shaped mounting seat part 2C on the upper part thereof. A strain gauge 7 is attached to the strain generating portion 2b of the strain generating column 2, and a gauge cord 8 is connected to the strain gauge.

Strain column 2 of the load cell configured as described above
In order to incorporate it into the cylindrical part 3a of the ram 3 of the press mentioned above, the attachment seat part 2c of the strain-extending column 2 is inserted from the tip part 3b of the ram 3 of the press,
A desired configuration can be achieved by fitting into the deepest mounting portion 3d and tightening the fixing screw 5 from the outside.

Also, a gauge cord 8 connected to the strain generating part 2b
is pulled out from the hole 3f provided in the cylindrical portion 3a of the ram 3 using a jig or the like and connected to an external measuring device. Further, reference numeral 9 denotes a rotation prevention plate clamped on the outer periphery of the ram 3, which is connected to the upper part of the press via a shaft (not shown) and moves up and down together with the ram 3.

(Effect of idea) The present invention has the following effects.

Conventional presses with a load cell had the disadvantage that the open height was reduced because the load cell was separately attached to the shank attachment part of the ram.However, according to the present invention, the load cell's strain column is installed in the dead space of the ram. This drawback is solved because it has a built-in

In conventional technology, there are two shank parts, upper and lower, which causes the jig to tilt due to eccentric loads.
This had the disadvantage of reducing work accuracy, but with this invention, the tilting of the straining column is prevented by a very small clearance at the tip of the ram, so it has high rigidity against eccentric loads, so this reduces work accuracy. It can be suppressed.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating the configuration of the present invention, FIG. 2 is a front view of a conventional example in which a load cell is assembled into a press, and FIG. 3 is an enlarged view of the main part of FIG. 2. In the figure, 1 is a load cell, 2 is a strain part, 2a is a shank attachment part, 2b is a strain part, 2c is an attachment seat part, and 3 is a ram.

Claims (1)

[Scope of utility model registration request] The strain-generating column of the load cell is integrally constituted by a shank mounting portion, a strain-generating portion, and a mounting seat portion, and the strain-generating column is configured such that the tip of the shank mounting portion is exposed inside the ram of the approximately cylindrical press. an integrated press, characterized in that the mounting seat is fixed to the ram, and the outer periphery of the shank mounting portion is slidably fitted to the inner periphery of the tip inside the ram. load cell.