JPS5855446Y2 - electric cylinder - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a stroke control device that sets or detects the stroke range or operating position of a linear actuator used for dampers, valves, etc.

Providing an external limit switch along the actuating member to detect the actuating position in order to set or control the stroke of a linear actuator is prone to various problems and is inconvenient in practice.

To solve this problem, Japanese Patent Application Laid-open No. 50-48374 has been proposed, but this method has many grooves in the circumferential direction of a cylindrical body that rotates with a rotation angle corresponding to the stroke of a linear actuator. The structure is complicated, and manufacturing is not easy, and the wiring system is also complicated. There are drawbacks.

Furthermore, since the contact state of the dog cannot be visually confirmed, it is difficult to adjust the operating point.

Furthermore, it is structurally impossible to attach a rotation angle signal generator that continuously extracts the rotation angle as a signal.

Limit switches are typically used for intermittent position sensing, and rotational angle signal generators are used for continuous position sensing, both of which are essential for applications such as damper valves.

The present invention solves the various drawbacks of the conventional device, and allows the operating position or range of the operating member to be easily set or detected, and can be easily installed on ready-made linear actuators. This makes it possible to provide a small-sized control device.

The proposed device will be explained below with reference to the figures. 1 is a motor;
2 is a rotating shaft, 3 is a manual shaft, 4 is a housing, 5 is a pinion gear attached to the rotating shaft, 6 is an intermediate gear, 36 is an intermediate shaft, 1
2 is a gear, and a screw rod 11.2 is screwed into the nut 13 of the operating member 15. to drive.

A sliding rod 14 is connected to the nut 13 and slides along the cylinder jacket 1B.

31 and 32 are limit switches for overload prevention, and 30 is an operating pin.

Reference numeral 47 denotes a case having a dustproof cover 48, which is attached to the housing 4 of the linear actuator.

In the case, a pinion gear 35 is attached to the tip of the intermediate shaft 36 as a connecting member, and a rotation angle conversion mechanism 37 is installed.
is connected to.

This rotation angle conversion mechanism is required to have a high reduction ratio because it converts the entire stroke of the actuator into a rotation angle of one rotation or less, but by arranging it like this device, it is compact. A unitized rotation angle conversion mechanism is obtained.

38 is an output shaft which rotates within 360 degrees with respect to the entire stroke of the actuating member 15.

Reference numeral 41 denotes a shaft sleeve extended and attached to the output shaft 38, on the outer periphery of which actuating discs 43a, 43b, etc. are attached so as to be adjustable in position with screws 42 etc., and the stroke adjustment device 40 is installed. It consists of

Reference numerals 45a, 45b, . . . are limit switches fixedly installed in the case corresponding to the actuating disks, and are actuated by recesses or protrusions 44 provided on the outer peripheral surface of the disks.

46 is a rotation angle signal generator such as a potentiometer, and is attached to one end of the shaft casing 41.

In the present control device, when installing a rotation angle signal generator such as a potentiometer, it is sufficient to fix it to the output shaft 38 and the shaft sleeve 41 without rearranging the dedicated reduction gear train, and the limit switch signal, rotation angle Both signals are obtained from the same location, making the whole system more compact.

Furthermore, when the cover 48 is removed, the stroke adjustment device 40, limit switch 45, and other components are all exposed, allowing for easy and accurate adjustment work.

In this embodiment, the manual shaft 3 is operated through the case 47, but depending on the position of the manual shaft, a pinion gear 35 corresponding to the intermediate shaft 36 of this embodiment may be attached to the output shaft.
Of course, it is also possible to attach it and the effect will be the same.

[Brief explanation of drawings]

Figure 1 is a sectional view of a linear actuator equipped with the proposed device;
The figure is an enlarged sectional view of the proposed device, and FIG. 3 is a partially cutaway left side view thereof.

Claims (2)

[Scope of utility model registration request] (1) In a linear actuator in which a motor rotating shaft, an intermediate shaft for deceleration, and an actuating member are arranged in parallel, the actuating member rotates within one revolution during the entire stroke of the actuating member upon rotation of the intermediate shaft or the motor rotating shaft. A rotation angle converting mechanism having a rotation output shaft configured as shown in FIG. A plurality of limit switches are fixedly attached to the shaft and abut on each of the actuation disks, and a rotation angle signal generator is attached to the shaft end, and the rotation angle conversion mechanism and the actuation disk and a limit switch housed in a case with a dustproof cover. (2) The device according to claim 1, wherein the rotation angle conversion mechanism is removably connected to the intermediate shaft or the shaft end of the motor rotation shaft.