JPS6246904Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an overload safety device for general industrial machinery, and more particularly to an overload safety device for industrial machinery equipped with a home position return device.

In conventional overload safety devices for general industrial machinery, for example, the torque transmitted to various industrial machines is adjusted by adjusting the deflection of a coil spring or a spring spring. Adjustment of the deflection was done by hand tightening means such as a pressure nut. Therefore, it is extremely difficult to adjust and change the transmitted torque, and the mounting locations are limited.

Furthermore, handling is troublesome and takes a long time, and it is extremely difficult to tighten evenly, which is a completely inefficient operation. Furthermore, since the safety device is a complicated mechanism, it has become expensive and uneconomical.

The present invention provides an overload safety device for general industrial machinery that can eliminate the drawbacks of the prior art as described above. a spline shaft 2 extending in the axial direction of the drive shaft 1; a drive shaft 3 that can freely swing or rotate simultaneously with the drive shaft 1 via the spline shaft 2;
The drive shaft 3 is further movable in the axial direction, and includes an intermediate ring 4 and a fixed flange ring 5 that are slidably fitted on the outer peripheral surface of the drive shaft 3; The fixed flange ring 5 is an industrial The intermediate ring 4 is slidably mounted on the fixed flange ring 5, and a gap 9 is formed between the intermediate ring 4 and the drive shaft 3. a driven shaft 10 having the intermediate ring fixed thereto; a side end surface 11 of the driven shaft 10 and a side end surface 12 of the drive shaft 3;
a plurality of recesses 13, 14 bored at random intervals or at equal intervals so as to omit two intervals; a sphere 15 fitted between the two recesses;
and; a through hole 16 formed so that the fixed flange ring 5 and the drive shaft 3 communicate with each other.
a pressure medium return device 17 capable of supplying or returning a medium such as gas or liquid having a predetermined pressure to the cavity 9 communicating with the through hole 16; An overload for an industrial machine equipped with an original position return device, characterized in that it is composed of a limit switch holding ring 19; and a limit switch 20 fixed to the industrial machine main body 6 at a predetermined distance from the holding ring 19. It is a safety device.

The purpose of the present invention is to provide an overload safety device for industrial machinery equipped with a home position return device for the purpose of always returning the meshing position to the same original position (to prevent so-called phase shift). be.

Another object of the present invention is that in the connection between the drive shaft 3 of an overload safety device and the driven shaft 10 of an industrial machine, if an abnormality occurs in the driven shaft 10 and an overload occurs, the entire mechanical device will be damaged. It is an object of the present invention to provide an overload safety device for an industrial machine equipped with an original position return device capable of immediately releasing the connection and stopping the drive shaft 1 driving the drive shaft 3 in order to protect the drive shaft 3.

Another object of the present invention is to use a pressure medium of gas pressure such as air or liquid pressure such as oil to extremely easily adjust the torque transmitted to industrial machinery.
It is an object of the present invention to provide an overload safety device for industrial machinery equipped with a home position return device that can adjust the transmitted torque by adjusting the pressure.

Still another object of the present invention is to provide an overload safety device for industrial machinery that has a simple structure, is easy to handle, and is equipped with a return-to-home device that can be manufactured at low cost.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, there is shown a longitudinal sectional front view of essential parts of an overload safety device for general industrial machinery equipped with a home position return device, which is an embodiment of the present invention. This figure shows a state in which the safety device is connected to a driven shaft 10 of an industrial machine, and the driven shaft 10 is operating such as swinging or rotating. Figure 2 is A-A of Figure 1.
3 is a sectional view taken along the line, and FIG. 3 shows the driven shaft 10.
FIG. 3 is a longitudinal sectional front view of main parts showing a state in which the entire device is stopped due to an overload. Reference numeral 1 denotes a swingable or rotatable drive shaft, which cannot be moved in the axial direction. 2 is a spline shaft formed to extend in the axial direction of the drive shaft 1; 3 is a drive shaft that can freely swing or rotate simultaneously with the drive shaft 1 via the uneven outer peripheral surface (not shown) of the spline shaft 2; , this drive shaft 3 is movable in the axial direction.
Reference numerals 4 and 5 denote an intermediate ring and a fixed flange ring that are slidably fitted on the outer circumferential surface of the drive shaft 3, and the fixed flange ring 5 can be fixed to the industrial machine main body 6, and ring 4
The side end surface 7 of is slidably provided on the side end surface 8 of the fixed flange ring 5, and a gap 9 is provided between the intermediate ring 4 and the drive shaft 3. 10 is a driven shaft of the industrial machine, which cannot move in the axial direction. And this driven shaft 10
is fixed to the intermediate ring 4. A plurality of cylindrical, conical, arcuate, etc. home position return recesses 13 and 14 are formed at symmetrical positions between the side end surface 11 of the driven shaft 10 and the side end surface 12 of the drive shaft 3. A spherical body 15 such as a steel ball is inserted between the recesses (see FIG. 1), or one side is removed (see FIG. 3). In the example shown in FIGS. 1 and 2, the purpose is to always keep the recess 13 on the driven shaft 10 side, the recess 14 on the drive shaft 3 side, and the ball 15 in the same original position (i.e., to maintain the same position (i.e., phase shift). For the purpose of prevention), the recesses 13, 14 and the sphere 1
In reality, 8 pairs of engagements (see Fig. 2: equally spaced, ie, at equal angles of 45°) are formed, but 7 pairs are formed and 1 pair is omitted. This configuration is an important point (feature) of the present invention, and this configuration is called an original position return device.

In addition, in order to achieve the purpose of preventing the phase shift, the recess formation positions may be arranged at random intervals instead of the above-mentioned equal intervals (equal angles).

In this way, a plurality of recesses 13 and 14 are bored at random intervals or at equal intervals, omitting two intervals, at symmetrical positions between the side end surface 11 of the driven shaft 10 and the side end surface 12 of the drive shaft 3. It is set up and formed.

A through hole 16 is formed so that the fixed flange ring 5 and the drive shaft 3 communicate with each other, and communicates with the cavity 9.

17 is an industrial machine main body 6 or other desired material for supplying a gas such as air or a liquid medium such as oil having a predetermined pressure to the through hole 16 and the cavity 9 or for reducing (returning to the original state). This is a conventionally known pressure medium recirculation device installed at a position where the industrial machine main body 6 can be remotely operated.

The limit switch retaining ring 19 is fixed to the other end surface 18 of the drive shaft 3, and a limit switch 20 is fixed to the industrial machine main body 6 at a predetermined distance from the retaining ring 19.

21 is a bearing fitted to the drive shaft 3; 22 is a bolt for fixing the drive shaft 3 and the limit switch retaining ring 19; 23 is a bolt provided to the drive shaft 3 and the intermediate ring 4; A sealing O-ring for making the shaft 3 and the intermediate ring 4 airtight or liquid-tight to prevent leakage of gas or liquid; similarly, 24 is the fixed flange provided on the fixed flange ring 5; A sealing O-ring for preventing gas or liquid leakage between the ring 5 and the drive shaft 3, 25 a thrust bearing installed in the fixed flange ring 5, and 26 a thrust bearing installed in the fixed flange ring 5, A bolt 27 is used to fix the driven shaft 10 and the intermediate ring 4 to the main body 6. A bolt 28 is attached to the inner periphery of the drive shaft 3 fitted to the outer periphery of the driven shaft 10. A bearing 29 that is slidable on the surface is a retaining ring for the shaft fitted on the driven shaft 10 to prevent the bearing 28 from moving. Reference numerals 30 and 31 denote a bearing and a retaining ring, which are fitted into the inner hole 32 of the fixed flange ring 5 in sequence.

Next, the operation and effects of the device of the present invention constructed as described above will be explained.

First, when a medium such as gas or liquid having a predetermined pressure is fed from the pressure medium return device 17 to the through hole 16 and the cavity 9, the drive shaft 3 moves to the driven shaft 1.
0 (see arrow), the spheres 15 fit into the plurality of recesses 14 provided in the drive shaft 3, and then the drive shaft 1 is started (swinging or rotating), the two recesses 13 , 14, a predetermined transmission torque can be applied to the driven shaft 10 via the sphere 15 fitted between the driven shaft 10.

In the unlikely event that an abnormality occurs in the driven shaft 10 and it becomes overloaded, the gas, liquid, etc. that was being pressed under the load (predetermined pressure) below the overload will be reduced in pressure as shown by the arrow in Figure 3. Return to medium return device 17 (backflow)
Then, only the drive shaft 3 moves along the axial direction of the spline shaft 2 and the drive shaft 1, and the sphere 15 that was initially fitted into the recess 14 separates from the side end surface 12 of the drive shaft 3 that is not recessed. When engaged, the gap between the side end surface 11 of the driven shaft 10 and the side end surface 12 of the drive shaft 3 is expanded, and at the same time, the limit switch retaining ring 19 fixed to the side end surface 18 of the drive shaft 3 on the drive shaft 1 side is By pressing the limit switch 20, the drive shaft 1 connected thereto can be stopped.

In the device of the present invention having the above-mentioned configuration, in particular, since the pressure medium recirculation device 17 such as pneumatic pressure or hydraulic pressure is used, it has the following advantages.

(1) Transmission torque can be easily adjusted and changed.

(2) There are no restrictions on the installation location.

(3) Transmission torque can be adjusted and changed by telefusion operation.

(4) Transmission torque can be set in stages using a solenoid valve. Moreover, switching is possible with a single switch.

(5) At symmetrical positions between the side end surface 11 of the driven shaft 10 and the side end surface 12 of the drive shaft 3, a plurality of holes are placed at random intervals or at equal intervals, omitting two intervals (see Figures 1 and 2). Since the recesses 13 and 14 for returning to the original position are formed and the recesses 13 and 14 are engaged with the sphere 15 (so-called original position return device), the engagement is always in one place, that is, always in the original position. Since they engage at the position of , the intended purpose of preventing phase shift is achieved.

Examples of uses for the device of the present invention include a drive shaft transmission section of a belt conveyor, a chain conveyor, a camshaft transmission section, a rotary index shaft transmission section, and various other applications.

The device of the present invention is extremely useful when adopted in these general industrial machines, increasing their economic and mechanical effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal sectional front view of the essential parts of an overload safety device for general industrial machinery equipped with a return-to-home device in an operating state, and FIG. A cross-sectional view taken along line A, and FIG. 3 is a vertical cross-sectional view of the main part when the operating state shown in FIG. 1 shifts to a stopped state due to overload. Explanation of symbols, 1... Drive shaft, 2... Spline shaft, 3... Drive shaft, 4... Intermediate ring, 5... Fixed flange ring, 6... Industrial machine body, 9... Cavity, 10... ...Driven shaft, 13, 14
... Recess for returning to original position, 15 ... Sphere, 16 ...
Through hole, 17... Pressure medium return device, 19... Limit switch holding ring, 20... Limit switch, 29... Shaft retaining ring, 21, 25, 2
8, 30... Bearing, 22, 26, 27...
Bolt, 31... Retaining ring for hole, 23, 24... O-ring for seal.

Claims (1)

[Scope of utility model registration request] A swingable or rotatable drive shaft 1; a spline shaft 2 extending in the axial direction of the drive shaft 1;
and; a drive shaft 3 that can freely swing or rotate simultaneously with the drive shaft 1 via the spline shaft 2;
The drive shaft 3 is further movable in the axial direction, and includes an intermediate ring 4 and a fixed flange ring 5 that are slidably fitted on the outer peripheral surface of the drive shaft 3; the fixed flange ring 5 is for industrial machinery. Main body 6
The intermediate ring 4 is slidably provided on the fixed flange ring 5, and has a gap 9 between the intermediate ring 4 and the drive shaft 3; and a driven shaft 10 to which the intermediate ring is fixed; a side end surface 11 of the driven shaft 10 and a side end surface 12 of the drive shaft 3;
a plurality of recesses 13, 14 for returning to the original position, which are bored at random intervals or at equal intervals so as to omit two intervals; and a sphere 15 fitted between the two recesses; ; A through hole 16 formed so that the fixed flange ring 5 and the drive shaft 3 communicate with each other; A medium such as gas or liquid having a predetermined pressure is supplied to the void 9 that communicates with the through hole 16; or a pressure medium return device 17 that can be reduced; a limit switch holding ring 19 fixed to the side end surface 18 of the drive shaft 3; a limit switch 20 fixed to the industrial machine main body 6 at a predetermined distance from the holding ring 19; An overload safety device for industrial machinery equipped with a home position return device, comprising: