JPH06100207B2 - Double-starting double cylinder - Google Patents

Description

Detailed Description of the Invention a. OBJECT OF THE INVENTION (Industrial field of application) The present invention relates to a double-cylinder operating at both starting ends and used in the fluid pressure operating equipment industry. More specifically, the present invention relates to a double-cylinder double-start-end cooperative type in which main and sub pistons are cooperated at the beginning and end of both forward and backward strokes to obtain a large starting force to easily and quickly reciprocate a heavy-weight driven object.

(Prior Art) Conventionally, as shown in FIG. 3, two main and sub cylinders 17 and 18 in which pistons 15 and 16 are installed are connected in series, and the main cylinder 17 side piston 15 is connected to the outside of the cylinder 17. Rod 19
There is known a double cylinder having a structure in which a rod 20 is attached to connect the end of the piston 16 on the side of the sub cylinder 18 to the rear end of the piston 15 of the main cylinder 17 described above.

(Problems to be Solved by the Invention) In the conventional double cylinder described above, when the two pistons 15 and 16 are made to cooperate in the forward stroke, both forces exert a force on the rod 19.
Therefore, the output is approximately doubled in the stroke range of the sub-cylinder 18, and half of the output is obtained in the remaining stroke. However, since the characteristics described above cannot be obtained in the stroke of retracting the pistons 15 and 16, a large starting force is required at the beginning even in the stroke of the backward stroke, and thereafter, it is sufficient to continue the exercise with a small force. There was a problem that it could not be used for reciprocating operation.

The present invention has been made in accordance with this current situation, and a center hole is provided in the rod-shaped sub piston and rod fitted in the sub cylinder, and the rod of the main piston fitted in the main cylinder is provided in the center hole. When the main piston is advanced, the flange provided at the base of the rod is applied to the rear end of one rod of the auxiliary piston at the forward end of the main piston, and the flange provided at the tip of the rod at the retracted end is the auxiliary piston. By hitting the front end of the other rod of the piston, the main and sub pistons work together at the starting end of the stroke to obtain a large starting force, so it reciprocates a heavy-weight driven object and similar. It is an object of the present invention to provide a double-cylinder that is both start-end cooperative and that operates easily and quickly.

B. Configuration of the Invention (Means for Solving the Problems) A means of the present invention for achieving the above-mentioned object is to arrange a long stroke main cylinder and a short stroke auxiliary cylinder in series, One rod goes out of the cylinder and the other rod goes into the main cylinder. A sub piston is fitted, and the rod goes out through the center hole provided in the sub piston and the rod. A main piston provided with is fitted with a collar that abuts one rod end of the sub-piston and the other rod end at the end of the stroke at the base and tip of the rod of the main piston. It is a double-cylinder structure with both start ends cooperating.

(Operation) In the double-cylinder actuated double cylinder having the above-described structure, the main piston and the sub piston are located at the rear end of the cylinder as shown in FIG. When fluid is supplied to the rear chambers of the main and sub cylinders in a state in which is in contact with the front end of one rod of the sub piston, the main and sub pistons move forward in cooperation with each other, and Since a large thrust is applied to the driven body (not shown), the driven body overcomes the inertial force and easily starts moving.
Then, the piston of the sub-cylinder reaches the end of the stroke and stops, and thereafter, since the fluid is supplied only to the main cylinder, the main piston increases in speed and moves forward, and the driven body is quickly moved to the end of the stroke and stopped. This is the first time
As shown in the figure, the collar at the base of the rod of the main piston hits the rear end of the other rod of the secondary piston to create a backward stroke cooperative dynamic.

In this way, when the driven body stopped at the end of the forward stroke is retracted, when fluid is supplied to the front chamber of the main and sub cylinders, the main and sub pistons move backwards in cooperation with each other, and the rod of the main piston moves. Since a large thrust force is applied to the driven body, the driven body also overcomes the inertial force in this case and starts to move easily, and the auxiliary piston reaches the end of the stroke and stops accordingly. Since it is supplied, the main piston increases its speed and retracts, moving the driven body to the end of the stroke and stopping it.At this time, the tip flange of the rod of the main piston hits the front end of one of the rods of the sub piston and moves forward. It creates a cooperative dynamics.

(Embodiment) An embodiment of a double-starting-coordinated double cylinder according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numerals 1 and 2 are main and sub cylinders, and the main cylinder 1 has a length that gives a stroke required for a driven body, and is formed to have a cross-sectional area capable of obtaining an output suitable for a rated load of the driven body. The sub-cylinder 1 has a length that matches the stroke of the starting end that requires a large starting force during the stroke, and the cross-sectional area (smaller than the main cylinder is required to obtain the force necessary to compensate for the insufficient output at the start of the main cylinder). , The same or large), both cylinders 1 and 2 are concentrically arranged in series, and fluid inlets and outlets 3 and 4 are provided in the front and rear of the main cylinder 1 and the sub cylinder 2 respectively.
The fluid inlets and outlets 5 and 6 are connected to the front and the rear of the container, respectively.

Reference numeral 7 denotes a sub-piston fitted in the sub-cylinder 2 described above and airtightly partitioning the interior into two chambers.
A rod 8 that goes out of the main cylinder 1 and a rod 9 that goes into the main cylinder 1 on the other side.
At the center of the rods 8 and 9, there is provided a central hole 10 through which the rod of the main piston described later is inserted.

Reference numeral 11 denotes a main piston fitted into the main cylinder 1 described above and airtightly partitioning the interior into two chambers, the front and rear chambers, and one of which penetrates a central hole 10 provided in the sub piston 7 and rods 8 and 9. Then
A rod 12 is provided, the tip of which protrudes forward of the front rod 8. A flange 13 is provided at the tip of the rod 12, which is the front end of one of the rods 8 of the sub-piston, and a driven body (not shown) is provided on the front side thereof. A screw 14 for connection is provided, and a flange 13 'that abuts the rear end of the other rod 9 of the sub piston 7 is provided on the base portion of the rod 12, that is, on the piston 11 side.

The double-cylinders of both start end cooperation type shown in the above embodiment,
With the main and sub pistons 11 and 7 stopped at the end of the backward stroke as shown in FIG. 2, fluid was supplied to the main cylinder 1 and the sub cylinder 2 from the inlets and outlets 3 and 5, respectively.
Then, while the front end of one rod 8 of the sub piston 7 is in contact with the collar 13 provided at the tip of the rod 12 of the main piston 11, the main and sub pistons 11 and 7 cooperate to push the driven body. , The driven body started to move easily by being applied with a starting force equal to or greater than the inertial force, and moved only by the force of the main piston 11. At this time, since the sub piston 7 reaches the end of the stroke and stops, the fluid supply is changed only to the main cylinder 1, so that the main piston 11 increases the speed and pushes the driven body to reach the end of the stroke promptly. At the same time, the collar 13 'provided on the base of the rod 12 of the main piston 11 hits the rear end of the other rod 9 of the sub piston 7, and the main and sub pistons 11 and 7 cooperate with each other at the beginning of the backward stroke. Completed.

Further, as shown in FIG. 1, the fluid was supplied to the front chambers of the main and sub cylinders 1 and 2 while the main and sub pistons 11 and 7 were stopped at the end of the forward stroke. Then, while the rear end of the rod 9 of the sub piston 7 is in contact with the collar 13 'provided on the base of the rod 12 of the main piston 11, the main and sub pistons 11, 7 are
Cooperated with each other to apply a force greater than the inertial force to the driven body to move it, but when the auxiliary piston 7 reaches the end of the stroke, the driven body is operated only by the main piston 11 to reach the end of the backward stroke, At the same time, the collar 13 provided at the tip of the rod 12 of the main piston 11 hits the front end of the rod 8 of the sub piston 7, and the main and sub pistons 11 and 7 are ready to cooperate at the beginning of the forward stroke.

C. EFFECTS OF THE INVENTION The double-starting-type cooperative double cylinder according to the present invention starts by the action of inertia because the primary and secondary pistons cooperate with each other to increase the output during the initial movement in both forward and backward strokes of the piston. Sometimes it requires a large force.For example, if it has a performance suitable for reciprocating operation of a heavy-weight driven body, etc., and if the driven body starts to move and a small force is sufficient, only the main piston will operate at a higher speed. It is possible to easily and quickly perform the reciprocation of the driven body and the similar operation.

The main piston operates independently after starting, but at the end of the stroke, the collars provided at the base and tip of the rod hit the front and rear rod ends of the sub piston to move the main and sub pistons together. Create a posture surely and guarantee stable operation.

It has unique effects such as.

[Brief description of drawings]

FIG. 1 is a cross-sectional side view of the double-starting double-cylinder double-cylinder according to the present invention which has reached the end of the forward stroke. FIG. 2 is a vertical cross-sectional side view which has reached the end of the backward stroke of the above. FIG. 3 is a vertical sectional front view of a conventional double cylinder. 1: Main cylinder 2: Secondary cylinder 7: Secondary piston 8: Front rod 9: Rear rod 10: Center hole 11: Main piston 12: Rod 13: Tsuba

Claims (1)

[Claims] 1. A sub-piston in which a long-stroke main cylinder and a short-stroke sub-cylinder are arranged in series, and one rod goes out of the cylinder and the other rod goes into the main cylinder in the sub-cylinder. The main cylinder is fitted with the main cylinder provided with the rod that goes through the center hole provided in the sub-piston and its rod and goes out to the main cylinder, and at the base and tip of the rod of the main piston. A double-cylinder of double start-end cooperation type, characterized in that, at the end of the stroke, a collar is provided which contacts one rod end of the sub-piston and the other rod end.