JPH055469Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a torque detection device provided on a power transmission shaft or the like.

[Technical background of the invention and its problems]

Strain gauges are used to detect torque on the power transmission shaft, but
Such devices are expensive and unreliable in adverse environments.

[Purpose of invention]

The present invention aims to solve the above-mentioned conventional problems and provide an inexpensive and highly reliable torque detection device.

[Summary of the idea]

In order to achieve this objective, the present invention has a first shaft as a driving shaft having the same axis, and a second shaft as a rotating shaft of a stirring blade facing into a closed container that stirs the material to be processed, which is a driven shaft. A first shaft joint and a second shaft joint are provided integrally with the corresponding shafts, facing each other at the ends of the shafts, a fitting convex portion and a fitting recess are respectively formed in both shaft joints, and one shaft joint The fitting convex portion of the first shaft is loosely engaged with the fitting concave portion of the other shaft joint, and a repulsion spring is interposed between arbitrary fitting surfaces to separate the fitting surfaces from each other, thereby repelling the rotational force of the first shaft. The spring is configured to be compressed and transmitted to the second shaft, and on the other hand, a hinge-like operating element is arranged between arbitrary play surfaces, and the center thereof is pivotally connected independently of the two shaft joints,
One end is pivotally connected to the one fitting convex portion and the other end is pivotally connected to the other opposing fitting convex portion, and a limit switch is provided on the rotation locus of the central portion of the operating element, and a limit switch is provided on the rotation locus of the central portion of the operating element, The limit switch detects the height of the protrusion of the central portion due to a change in the torque acting on the second axis based on the amount of the object, and the amount of the object to be processed is detected by the on/off operation of the limit switch. be.

That is, in the present invention, a spring, such as a repulsion spring, is provided between certain arbitrary mating surfaces, and a hinge-like actuator is arranged between the arbitrary mating surfaces, so that the repulsion spring expands and contracts depending on the magnitude of torque. The purpose is to detect the magnitude of torque by detecting changes in the protruding state of the central portion of the actuator provided between the play surfaces.

As described above, the torque detection device according to the present invention is basically mechanical and has a simple structure, so it can be provided as a highly reliable and inexpensive device.

[Specific example of idea]

The present invention will be explained below using specific examples shown in the drawings.

1 is a first shaft connected to a power source, and 2 is a second shaft connected to a load side, for example, a stirring blade, and these shafts are arranged with the same axis. Also, at the ends of the first shaft 1 and the second shaft 2, a first shaft coupling 3 and a second shaft joint 3 are provided.
A shaft joint 4 is integrally provided via a key, and these are opposed to each other.

Two fan-shaped fitting protrusions 3A with an opening angle of less than 90 degrees are formed in the first shaft joint 3 symmetrically in the circumferential direction, thereby forming a fitting recess 3B relatively. There is. Similarly, the second shaft joint 4 is also formed with a fitting convex portion 4A and a fitting recess 4B. The fitting convex portion 3A of the first shaft joint 3 is connected to the second fitting convex portion 3A.
The fitting convex portion 4A of the second shaft coupling 4 loosely fits into the fitting recess 4B of the shaft coupling 4, and conversely, the fitting convex portion 4A of the second shaft coupling 4 fits into the fitting recess 3 of the first shaft coupling 3.
He is playing with B. As mentioned above, the fitting convex portion 3
Since the opening angles of both A and 4A are less than 90 degrees, the circumferential side surfaces 3a and 3b of the fitting convex portions 3A and 4A
Also, gaps 5 and 6 exist between 4a and 4b.

On the other hand, paying attention to FIG. 3, the fitting convex portions 3A, 4
Through holes 7 and 8 are formed concentrically in A, and a repulsion spring 9 is arranged across these through holes 7 and 8.
Both ends thereof are in contact with washers 11 fixed with nut springs 10. As a result, the spring 9 applies a force to the first shaft joint 3 and the second shaft joint 4 to open the gap 5. Further, diagonally cut recesses 12 and 13 are formed in the side surfaces 3b and 4b, and a hinge-like actuator 14 is attached so as to straddle these recesses 12 and 13. This operating element 14
is provided with a convex piece 14A and a concave piece 14B, the central part of which is pivotally connected by a pivot 14c, and the end (base) of the convex piece 14A is connected to the fitting convex part 3A by a pivot 14D.
The end of the concave piece 14B is pivotally connected to the fitting projection 4A by a pivot 14E.

Although not shown, a spring and an actuator having the same configuration are arranged at another symmetrical location.

On the other hand, around the shaft couplings 3 and 4, the actuator 1
A limit switch 15 is arranged on the locus of rotation of the motor 4, and is connected to a control device or the like.

In such a torque detection device, the first shaft 1, and therefore the first shaft coupling 3, is activated by the operation of the power source.
When rotated clockwise as shown by the arrow in Fig. 1, the fitting convex portion 3A
transmits rotational force to the fitting convex portion 4A of the second shaft joint 4 while compressing the spring 9. As a result, the second
The shaft joint 4 and the second shaft 2 are rotated, and for example, a stirring rotary blade attached to the second shaft 2 is rotated.

In this case, for example, if there is only a small amount of material to be stirred on the stirring rotary blade, the load will be small;
If the volume of the material to be stirred is large, the load will be large. As a result, when the load on the stirring rotary blade is small and the torque acting on the second shaft 2 is small, the rotational force from the first shaft 1 to the second shaft 2 is easily transmitted, and the gap 5 is The gap 6 becomes smaller. Therefore, as shown in FIG. 5, the actuator 14 is high at its center and protrudes outward with a height H _h . Conversely, when the load on the stirring rotary blade increases, the second shaft joint 4 tends to stagnate, so in order to provide rotational force, the spring 9 must be compressed greatly.
The gap 5 must be kept narrow. As a result, the gap 6 opens wide, the operating element 14 lies down, and the height H _l of its central portion becomes lower.

Therefore, if the volume of the object to be stirred is still small, the actuator of the limit switch 15 continues to be pressed, but as the volume of the object to be stirred increases, the operation of the limit switch 5 is stopped. Thus, by detecting the protruding state of the operating member 14, the volume of the object to be stirred can be determined.
In addition, it is especially convenient to be able to know the capacity of the objects to be processed in the closed tank.

[Modified example]

In the above example, the spring 9 and the actuator 14 are provided at different locations, but the actuator 14 may be provided sandwiching the gap 5 that the spring 9 spans. In this case, when the load is small, the amount of protrusion of the actuator 14 is small, and when the load is large, the amount of protrusion of the actuator 14 is large.

Further, the springs 9 may be provided in all of the gaps to create a balanced state.

In the above example, the protruding state of the actuator 14 is detected on and off using a limit switch, but a phototube that looks at the peak of the actuator may also be used as a means for detecting the protruding state. Other appropriate means are possible, and if an imaging device such as an image sensor is used, continuous changes in the volume of the object to be stirred can also be detected.

[Effect of idea]

As described above, the present invention provides a torque detection device that is structurally simple and mechanical, and therefore highly reliable even under adverse conditions.

Further, in the present invention, a repulsion spring is provided to separate the loose surfaces from each other, and the rotational force of the first shaft is transmitted to the second shaft while compressing the repulsion spring. In this case, it is conceivable to directly detect the deformation state of the repulsion spring based on the change in torque force, but a simple and reliable detection means has not yet been found.
However, fortunately, the separation distance between the playing surfaces of the double-shaft joint changes due to changes in torque, so if this change is detected by a hinge-like actuator provided separately from the repulsion spring, the separation distance between the playing surfaces can be changed. Changes can be detected reliably, the detection means is extremely simple and inexpensive, and has the advantage of being highly durable. Furthermore, in the present invention, the load on the stirring blades, in other words, the torque of the second shaft, is used to detect the amount of the processed material to be stirred, so the amount of contents inside the hermetic stirrer is detected while it is being stirred. In other words, dynamic detection can be performed.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the torque detection device according to the present invention, Fig. 2 is an exploded perspective view of the spring portion thereof, Fig. 3 is a cross-sectional view of the assembled state, and Figs. 4 and 5 are the operating elements. It is a schematic explanatory diagram showing the movement of. DESCRIPTION OF SYMBOLS 1...First shaft, 2...Second shaft, 3...First shaft joint, 3A...Fitting convex part, 3B...Fitting concave part, 4...
...Second shaft joint, 4A... Fitting convex portion, 4B... Fitting recess, 5, 6... Gap, 9... Spring.

Claims (1)

[Scope of Claim for Utility Model Registration] The end of the first shaft as a driving shaft having the same axis and the second shaft as a driven shaft as a rotating shaft of a stirring blade facing into the closed container that stirs the material to be processed. A first shaft joint and a second shaft joint are integrally provided on the corresponding shafts, facing each other, a fitting convex portion and a fitting recess are respectively formed on both shaft joints, and a fitting convex portion on one shaft joint is formed. is loosely engaged with the fitting recess of the other shaft joint, and a repulsion spring is interposed between arbitrary mating surfaces to separate the mating surfaces from each other, and the rotational force of the first shaft is compressed by the repulsion spring. On the other hand, a hinge-like actuator is arranged between arbitrary play surfaces, the center of which is pivotally connected independently of the two shaft joints, and one end is connected to the second shaft. The other end of the mating convex portion is pivotally connected to the other mating convex portion facing each other, and furthermore, a limit switch is provided on the rotation locus of the central portion of the operating element, and a limit switch is provided on the rotation locus of the central portion of the operating element, and a limit switch is provided on the rotation locus of the central portion of the operating element, and a limit switch is provided on the rotation locus of the central portion of the operating element. A torque detection device characterized in that the limit switch detects the height of the protrusion of the central portion due to changes in torque acting on two axes, and the amount of the object to be processed is detected by the on/off operation of the limit switch.