JPH02201826A - Motor operation device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention "Field of Industrial Application" The present invention relates to electric operating machines for opening and closing valves, dampers, etc., and particularly to operating machines for process control valves, air conditioning control valves, thermal equipment control valves, etc. Use as.

"Prior Art" A conventional electric operating machine is a valve opening/closing electric operating machine whose main shaft is rotated through a gear by the rotation of a motor, as disclosed in the full specification of Utility Model Application No. 62-871, for example. , two cams are fixed to the output shaft in an adjustable manner, and two switches are connected to the cams, and the two cams are adjusted for each switch (valve fully open, valve fully open). (The switch should be activated in each position.)
It was something to do.

In this case, since the adjustment work was performed twice, the number of man-hours was large and the workability was extremely poor. Furthermore, once the adjustment of one switch is completed, the electric actuator must be rotated once in order to adjust the other switch, and during this operation, there is a "waiting time" for the operator.
This resulted in a decrease in laminar performance.

Furthermore, in the prior art, two switch levers were mounted one on top of the other, so some switch levers were subjected to a tensile load and others were subjected to a compressive (bending) load. Since the switch itself is a commercially available product and is inexpensive, the switch lever is relatively thin and has the disadvantage that it tends to bend, especially when subjected to bending loads.

In addition, with conventional technology, there is no standard force for installing the switch,
The switch was placed in line with the screw hole in the base plate, and the screws were inserted into the switch hole, making it difficult to secure the switch.

"Problems to be Solved by the Invention" The problems to be solved by the present invention are: (1) The number of man-hours and adjustment time for the two switches is long.

■Durability is low due to the bending load on the switch lever.

■Difficult to install and secure the switch.

etc.

"Means for Solving the Problems" In order to solve the above-mentioned problems, the present invention transmits the rotational force of the electric motor 1 to the output shaft 3 via the reducer 2, and changes the rotational position of the output shaft into two positions. In the electric operating machine that is detected by the switch 4, a plurality of pins 6 are fixedly arranged on the base plate 5 of the reducer, and the two switches are positioned and fixed based on the pins, and can be adjusted with respect to the output shaft. A single cam 7 is fixed, and a protrusion 8 is formed on the cam so that the switch is turned on and off when the output shaft rotates, and both of the two switch levers 9 receive a tensile load during operation. It is arranged in

``Function'' The plurality of pins 6 facilitate installation and fixation in the holes of the switch 4 1, and the protrusion 8 of the single cam 7 determines the rotational position of the two switches, and the pins 6 determine the rotational position of the two switches and are connected to the output shaft. Adjustments can be made in one go. Both switch levers 9 are subjected to a tensile load.

``Example'' The present invention will be described below with reference to an example shown in the drawings.

The figure shows an example in which an electric operating machine is mounted on a pole valve 12 at a port 13. The valve body 16 opens and closes a flow path communicating from the inlet 18 to the outlet 18, and a pore 17 is bored in the valve body 1B. The valve stem 20 is rotatably attached to the valve body 14, and two O-rings 21 are attached to the outer diameter to prevent fluid from leaking to the outside.

In the electric operating machine, both a base 10 and a case 22 are made of synthetic resin, a base plate 5 is fixed to the base 10, and a reduction gear is disposed inside the base 10.
is formed. The electric Ja1 is fixed to the base plate 5, and the motor shaft 11 is directly fitted into a hole in the base 10, so that the base 10 forms a bearing part.

A concave groove is formed at the lower end of the output shaft 3 rotatably disposed on the base 10, and engages with a convex portion at the upper end of the valve stem 20 of the Paul valve to transmit rotational force. Further, a gear 23 is press-fitted and fixed to the output shaft 3, and meshes with a pinion 24 press-fitted and fixed to the motor shaft 11 of the electric motor to transmit rotational force. The pin 6 integrally molded with the base 10 penetrates the base plate 5 and projects upward, and is fitted into the mounting holes of the two switches 4. On the other hand, the screw 25 on the second side is screwed into the base plate 5 through the switch mounting hole. A rotatable cam 7 is attached to the output shaft 3 so as to be adjustable with a screw 2B. Further, a protrusion 8 is formed on the outer periphery of the cam 7, and the rotation of the cam operates the switch in the direction in which the switch lever 9 receives a tensile load.

To explain the operation of the embodiment, the output shaft 3 rotates counterclockwise (see Fig. 3) due to the rotation of the electric motor upon receiving electrical input, and the protrusion of the cam is rotated so that a tensile load is applied to the switch lever 9 of the switch 41. acts as a pressure and activates the switch, cutting off the electrical input to the motor. At this time, the valve is in the open state (see Figure 1).Next, when there is an electrical input on the reverse side of the motor, the output shaft 3
is rotated clockwise, the protrusion of the cam presses the switch lever 9 of the switch 42 (Fig. 3) so that a tensile load is applied, the switch is activated, the electrical input to the motor is cut off, and the valve is closed. becomes closed.

In the example, the rotation angle of the output shaft is 90 degrees, but
The present invention can also be applied to examples of rotation of 180 degrees, examples of other angles, other valve shapes, dampers, etc.

As an advantage of the embodiment, since the upper end of the output shaft 3 is directly inserted into the case 22 made of synthetic resin, a bearing is not required in this part, and smooth rotation can be obtained.

In addition, since the valve stem 20 of the Pall valve is inserted into the bearing 27 fixed to the base 10, rotation is ensured with respect to the bearing 27, and torque transmission is ensured, and sliding due to rotation of the valve stem is prevented. There is no wear or damage to the parts, and the bearing 27 has the effect of bearing both the output shaft 3 and the valve stem 20.

"Effects of the Invention" The present invention only adjusts and sets the operating position of one switch using one cam for two switches, eliminating the need for adjusting the other switch, and further eliminating the need for adjusting the other switch. This eliminates the "waiting time" for the output shaft to rotate, and for this purpose, the relative positional relationship of the two switches with respect to the protrusion of a single cam can be accurately determined using multiple pins 6 on the base plate. This was achieved through positioning, which greatly reduced the adjustment time and man-hours for the electric actuator. The pin 6 also facilitates the installation of the switch. Furthermore, since the switch is independent and each switch lever receives only a tensile load, the durability of the switch can be greatly improved.

Further, in the second invention, since the plurality of pins 6 are integrally molded with the base 10 from resin, there is no need to press-fit the pins 6 separately, and there is no need to drill holes for press-fitting the pins separately.

Furthermore, in the third invention, the bearing of the motor shaft 11 is attached to the base 10.
Since it is made of synthetic resin, there is no need to press fit the bearing, making it possible to omit bearing parts and reducing manufacturing costs.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the electric actuator of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. FIG. 4 is a sectional view taken along line CC in FIG. i, ..., electric motor 2, ..., reduction gear 3
,,,output shaft 4,,,,switch 7 58
0. . Base plate 6. , Pin 7 , Cam 8 , Projection 9 , Switch lever 10. ,,,Base 11,,,Motor shaft

Claims (3)

[Claims] (1) In an electric operating machine that transmits the rotational force of an electric motor 1 to an output shaft 3 via a reducer 2 and detects the rotational position of the output shaft using two switches 4, a plurality of The pin 6 is fixedly arranged, and the pin 2 is set as a reference.
In addition to positioning and fixing the switches, a single cam 7 is fixed to the output shaft so as to be adjustable, and a protrusion 8 is attached to the cam.
The electric operating machine turns on and off the switch when the output shaft rotates, and the two switch levers 9 are arranged so as to receive a tensile load when activated. (2) In an electric operating machine that transmits the rotational force of the electric motor 1 to the output shaft 3 via the reducer 2 and detects the rotational position of the output shaft using two switches 4, a plurality of The pin 6 is fixedly arranged, and the pin 2 is set as a reference.
In addition to positioning and fixing the switches, a single cam 7 is fixed to the output shaft so as to be adjustable, and a protrusion 8 is attached to the cam.
The two switch levers 9 are arranged so as to receive a tensile load during operation, and the plurality of pins 6 are connected to the base 10 of the reducer. An electric operating machine characterized by being integrally molded with resin. (3) In an electric operating machine that transmits the rotational force of the electric motor 1 to the output shaft 3 via the reducer 2 and detects the rotational position of the output shaft using two switches 4, the base plate 5 of the reducer has a plurality of The pin 6 is fixedly arranged, and the pin 2 is set as a reference.
In addition to positioning and fixing the switches, a single cam 7 is fixed to the output shaft so as to be adjustable, and a protrusion 8 is attached to the cam.
The switch is turned on and off when the output shaft rotates, and the two switch levers 9 are arranged so as to receive a tensile load when activated, and the bearing part of the motor shaft 11 of the electric motor is connected to the reducer. An electric operating machine characterized in that it is integrally molded with a base 10 of resin.