JPH066248Y2 - 2-stage actuator - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a two-stage actuator, and more particularly to a two-stage actuator adapted to move a rod back and forth in two strokes by applying negative pressure. Is.

[Conventional technology]

An example of a conventional two-stage actuator of this type is shown in FIG. 6, 31 is a lower rod, and the diaphragm retainers 33, 3 are provided at the left end of the lower rod 31 in the figure.
The diaphragm 35 sandwiched between the four is mounted by the nut 36, and the peripheral edge of the diaphragm 35 is fixed to the housing 41 by the caulking portion 61 of the lower cup 42 and the center case 60.

Reference numeral 32 denotes an upper rod, and a diaphragm 39 sandwiched between diaphragm retainers 37 and 38 is attached to a left end of the upper rod 32 in the figure by a nut 40, and a peripheral portion of the diaphragm 39 has a center case 60 and an upper cup 43. The caulking portion 43 and the caulking portion 47
It is fixed to the housing 41 by.

As a result, a diaphragm chamber 49 connected to a negative pressure source (not shown) is formed in the housing 41 via the joint 48, and the diaphragm 39 is urged by the upper spring 51 to the right in the figure.

Further, in the housing 41, a diaphragm chamber 50 that is connected to a negative pressure source (not shown) via a joint 62 is formed, and a center hook 52 that engages with the upper rod 32 is formed.
The lower spring 53 provided between the diaphragm retainer 37 and the diaphragm retainer 37 urges the diaphragm 35 in a direction away from the diaphragm 39 (rightward in the figure).

Reference numeral 54 is a bracket, and the bracket 54 is attached to a welding gilt 63 fixed to the lower cup 42 by a spring washer 64 and a nut 65.

As shown in FIG. 7, the conventional two-stage actuator constructed as described above first applies a negative pressure to the diaphragm chamber 49 via the joint 48, and the negative pressure is applied to the upper spring 51. When the force is exceeded, the diaphragm 39 is deformed to the left in FIG. 6 and the upper rod 32 is deformed.
And the lower rod 31 will be moved to the left in the figure.

Next, with the negative pressure applied to the diaphragm chamber 49, the negative pressure is also applied to the diaphragm chamber 50 via the joint 62, and when the negative pressure exceeds the urging force of the lower spring 53, the diaphragm 35 is moved. The lower rod 31 is deformed leftward in the figure to move the lower rod 31 leftward in the figure.

[Problems to be solved by the device]

However, in such a conventional case, the shape of the center case 60 is complicated, both the positioning of the joint 48 and the positioning of the joint 60 must be performed, and the lower cup 42 and the center. Both the caulking part 61 with the case 60 and the caulking part 47 with the center case 60 and the upper cup 43 must be caulked, and the bracket 54 is attached after the caulking part 61 with the lower cup 42 and the center case 60 is caulked. For this reason, the welding bolt 63 must be fixed to the lower cup 42 in advance, and the spring washer 64 and the nut 65 must be used for tightening. Therefore, there is a problem that it takes time to manufacture.

It is an object of the present invention to provide a two-stage actuator capable of solving the problems of the conventional ones and facilitating manufacture.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention mounts two stages of diaphragms at intervals in the axial direction of the rod,
A two-stage type in which peripheral portions of these diaphragms are fixed to a cylindrical housing to form two diaphragm chambers, and a negative pressure is applied to these diaphragm chambers to move the rod back and forth in two strokes. In the actuator, the housing does not include an upper cup that forms the first-stage diaphragm chamber and includes a joint that connects to a negative pressure source, and does not include a joint that forms the second-stage diaphragm chamber and connects to a negative pressure source. The lower cup is provided with a large diameter part whose one end is crimped with the upper cup, and a collar is inserted into the large diameter part to fix the peripheral portions of the respective diaphragms to both ends thereof. A valve is provided on the diaphragm of the first stage, and the diaphragm of the first stage ends in the stroke in the diaphragm chamber of the first stage. Is provided with a pin for communicating said two diaphragm chambers is opened the valve when it reaches.

[Action]

By adopting the above-mentioned means, this invention can perform the positioning of the joint only once and the caulking work only once, so that it can be easily manufactured.

〔Example〕

 An embodiment of the present invention shown in the drawings will be described below.

FIG. 1 and FIG. 2 show an embodiment of a two-stage actuator according to the present invention. The two-stage actuator comprises a lower rod 1 and an upper rod 2.

A diaphragm 5 sandwiched between diaphragm retainers 3 and 4 is attached by a nut 6 to the left end of the lower rod 1 in the figure, and a diaphragm 9 sandwiched between diaphragm retainers 7 and 8 is attached to the left end of the upper rod 2 in the figure. Is attached by a nut 10.

The housing 11 has a lower cup 12 and an upper cup 1.
3, a lower cup 12 is formed with a large diameter portion 14 whose one end (the left end in the drawing) is crimped with the upper cup 13, and a collar 15 is inserted into the large diameter portion 14 to form its both ends (that is, the lower portion). Between the step portion 16 of the cup 12 and one end portion of the collar 15, and between the caulking portion 17 of the lower cup 12 and the upper cup 13 and the other end portion of the collar 15, the peripheral portions of the diaphragms 5 and 9 are respectively provided. It is fixed.

As a result, in the housing 11, a diaphragm chamber 19 connected to a negative pressure source (not shown) via the joint 18,
A diaphragm chamber 20 having no external joint is formed, the diaphragm 9 is urged to the right in the figure by an upper spring 21, and the diaphragm 5 includes a center hook 22 and a diaphragm retainer 7 that engage with the upper rod 2. A lower spring 23 provided between the upper and lower sides urges the diaphragm 9 away from the diaphragm 9 (rightward in the figure).

In the figure, 24 is a bracket.

As shown in FIGS. 3 and 4, a through hole 25 is formed in the diaphragm 9 and the diaphragm retainers 7 and 8, and a valve 26 that closes the through hole 25 is attached to the diaphragm retainer 7, while the diaphragm chamber is closed. 19
A pin 28 is provided on a holder 27 attached to the upper cup 13.

When the diaphragm 9 is displaced to the left in the drawing and reaches the end of its stroke, the pin 28 opens the valve 26 so that the diaphragm chamber 19 and the diaphragm chamber 20 communicate with each other, as shown in FIG. Has become.

Next, the operation of the one configured as described above will be described.

First of all, the diaphragm chamber 19 is connected via the joint 18.
Diaphragm chamber 1 when no negative pressure is applied to
Since both 9 and 20 are at atmospheric pressure, the diaphragms 5 and 9 are at the positions shown in FIG.
6 is closed.

Next, when a negative pressure is applied to the diaphragm chamber 19 via the joint 18 and the negative pressure exceeds the urging force of the upper spring 21, the diaphragm 9 is deformed to the left in the drawing, and the upper rod 2 and the lower rod 1 are drawn. Move to the center left.

When the diaphragm 9 reaches the end of its stroke, it comes to the position shown in FIG.

At this time, the valve 26 is pushed and opened by the pin 28 as shown in FIG. 5, so that the diaphragm chamber 19 and the diaphragm chamber 20 are in communication with each other.

Subsequently, when the negative pressure applied to the diaphragm chamber 19 via the joint 18 is increased and the negative pressure exceeds the biasing force of the lower spring 23, the diaphragm 5 is deformed to the left in the figure and the lower rod 1 is moved to the position shown in FIG. Move it further to the left from the position shown.

That is, simply by applying a negative pressure from one joint 18, a two-step stroke operation is performed according to the magnitude of the negative pressure.

Further, in manufacturing, the collar 15 is sandwiched between the diaphragms 5 and 9 and these are inserted into the lower cup 12, and then the upper cup 13 is caulked. Therefore, the caulking portion is caulked between the lower cup 12 and the upper cup 13. The portion 17 has only one place, and the bracket 24 can be attached to the lower cup 12 by an appropriate means.

[Effect of device]

Since the present invention is configured as described above, since the joint is provided only in the diaphragm chamber for the first stage, the positioning of the joint only needs to be done once, and the lower cup and the upper cup are directly caulked, so that the caulking is also possible. Since it only needs to be performed once, the number of steps is smaller than that of the conventional one, and it has an excellent effect that it can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of an initial position showing an embodiment of a two-stage actuator according to the present invention. FIG. 2 is a cross-sectional plan view of the stroke end position of the first stage of the one shown in FIG.
The figure is an enlarged vertical cross-sectional view of the main part of the one shown in FIG. 1, and FIG.
FIG. 5 is a right side view of the drawing, FIG. 5 is an enlarged vertical sectional view showing a state in which the valve is open, FIG. 6 is a cross sectional plan view of an initial position showing an example of a conventional one, and FIG. 7 shows negative pressure and stroke. It is a graph which shows a relationship. 1, 31 ...... Lower rod 2, 32 ...... Upper rod 3, 4, 7, 8, 33, 34, 37, 38 ...... Diaphragm retainer 5, 9, 35, 39 ...... Diaphragm 6, 10, 36, 40 ... … Nuts 11, 41 …… Housings 12,42 …… Lower cups 13,43 …… Upper cups 14 …… Large-diameter parts 15 …… Collar 16 …… Step parts 17,47,61 …… Crimping parts 18,48, 62 ... Joint 19, 20, 49, 50 ... Diaphragm chamber 21, 51 ... Upper spring 22, 52 ... Center hook 23, 53 ... Lower spring 24, 54 ... Bracket 25 ... Through hole 26 ... Valve 27 …… Holder 28 …… Pin 60 …… Center case 63 …… Welding bolt 64 …… Spring washer 65 …… Nut

Claims (1)

[Scope of utility model registration request] 1. Rods (1) (2) are mounted with two stages of diaphragms (5) (9) spaced apart from each other in the axial direction, and peripheral portions of these diaphragms (5) (9) are cylindrical. Two diaphragm chambers (19) fixed to the housing (11)
(20) forming these diaphragm chambers (19)
Apply a negative pressure to (20) to move the rods (1) and (2) to 2
In a two-stage actuator adapted to move back and forth in a step stroke, the housing (11) is an upper cup (joint (18) connected to a negative pressure source and forming the diaphragm chamber (19) of the first step. 1
3) and a lower cup (12) that forms the diaphragm chamber (20) of the second stage and does not have a joint connected to a negative pressure source. The lower cup (12)
A large diameter portion (14) whose one end is crimped to the upper cup (13) is provided, and a collar (15) is provided on the large diameter portion (14).
And insert the diaphragms (5) (9) at both ends.
Of the first stage diaphragm (9) is fixed to the diaphragm (9) of the first stage, and the diaphragm (9) of the first stage is at the end of the stroke in the diaphragm chamber (19) of the first stage. A two-stage actuator comprising a pin (28) provided to open the valve (26) when the temperature reaches and to communicate the diaphragm chambers (5) and (9).