JPS59137637A - Air spring having long stroke - Google Patents

Abstract

PURPOSE:To maintain intervals between end plates and intermediate plates and between the intermediate plates at predetermined ones in elongating an air spring to prevent a bellows from puncture by interposing connecting members of tension springs between the end plates and the intermediate plates and between the intermediate plates. CONSTITUTION:When air is supplied to an air supply-exhaust pipe 25 through a valve 27, it passes sequentially through a small through hole 22 in the lower end plate 2 and a plurality of small through holes 32 in the intermediate plates 3, guided by a guiding main strut 6 fixed to the upper end plate 1 and stops when respective bellows 4 are extended and a stopper 70 abuts against the lower end plate 2. The elongation of the bellows 4 extends through auxiliary struts 7 respectively tension springs 8 interposed between the lower end plate 2 and the intermediate plate 3 and between the respective intermediate plates 3, so that the elongations of the tension springs are equalized approximately to each other to prevent the bellows from puncture due to the excessive elongation of bellows 4. Also, the bellows can be prevented from wear or the like due to swing thereof by a main strut 6 and small through holes for air disposed near the main strut.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air spring, and particularly to an air spring that expands and contracts over a long stroke.

Conventional air springs are generally made by tightly fixing both ends of an extensible gobellow between a pair of plates, and by press-fitting air into the pair of plates and the bellows for cushioning, or by removing the press-fitted air. It is used to drive telescopic operation.

Conventional air springs have short expansion and contraction strokes. This is because conventional air springs are only used for shock absorption or for driving short stroke telescoping operations, so there is no need to make the telescoping stroke long, and therefore a short telescoping stroke is sufficient. Deroru. For this reason, conventional air springs have the advantage of being able to perform telescoping operations with almost no noise, but have the disadvantage that they cannot be used for long telescoping strokes for the reasons mentioned above.

In 1970, the present applicant proposed a long stroke air spring (Japanese Patent Application No. 55-55421) that improved the drawbacks of the above-mentioned air springs.
was proposed first.

This long stroke air spring has one or more intermediate plates arranged between two end plates, and a bellows installed between the two end plates and the intermediate plate or between the intermediate plates and the zero plate. The intermediate plate is interposed in an expandable and airtight manner, and a through hole for air circulation is provided inside the bellows of the intermediate plate, and air is supplied to the air chamber formed by the two end plates and the bellows. The information was communicated to the department.

Air springs with such long strokes have long expansion and contraction strokes, so the gap between the end plate and the intermediate plate and the gap between the intermediate plates may become too stretched during expansion.
, then there is the problem that there is a risk of the bellows becoming punctured.

The present invention relates to the improvement of the above-mentioned long stroke air spring, and aims to provide a long stroke air spring that prevents the bellows from banking.

In the present invention, a linking member is interposed between two end plates and an intermediate plate or between an intermediate plate and an intermediate plate. It is characterized in that the space between the intermediate plates is equally spaced.

Hereinafter, one embodiment of the long stroke air spring of the present invention will be described with reference to the accompanying drawings.

The long stroke mechanical spring of the present invention in this embodiment is a newly assembled 5-unit type, with a circular upper end plate 1, a lower end plate 2, and a circular shape with the same diameter as the upper and lower end plates 1 and 2. four intermediate plates 3, five bellows 4 each having a bellows shape with 104 strips made of an elastic member such as rubber, a cushion ring 5, and one bellows 4 that guides the reciprocating movement of the upper end plate 1 and the intermediate plate 5. , four auxiliary columns 7 that similarly guide the reciprocating movement of the upper end plate 1 and the intermediate plate 3, and keep the upper and lower end plates 1, 2 and the intermediate plate 60 at equal intervals, and the upper and lower end plates 1. , 2 and a spring 8 as a connecting member that maintains equal intervals between the intermediate plates B and 2.

Engagement pawls 10, 20, 50, which airtightly engage the upper and lower ends of the bellows 4, are provided on the lower surface of the upper end plate 1, the upper surface of the lower end plate 2, and the upper and lower surfaces of the intermediate plate 6 in an annular manner with the same diameter. . Through holes 21 and 51 i having the same diameter as the outer diameter of the main support 6 or slightly larger than the outer diameter of the main support 6 are formed in the center of the lower end plate 2 and the intermediate plate A.
At the same time, the lower end 2 and the through hole 21 of the intermediate plate 3,
Small through hole 22.52 for 20 air flows near the periphery of 51
Provide four. The upper end plate 1° and the lower end plate 2. Four mounting plates 15°25.55t are integrally protruded in the cross direction around the outer periphery of the intermediate plate 3, and the lower end plate 2 of the mounting plate 15°25.55t is provided.
And the auxiliary support 7 is attached to the mounting plate 25°55 of the intermediate plate 3.
The through holes 24 and 54 are provided with a diameter larger than the outer diameter of the spring 8 and smaller than the inner diameter of the spring 8. The upper end of an air supply/discharge tube 25 having a size that can completely surround the small through hole 22 for air circulation in the lower end plate 2 is fixed to the lower surface of the lower end plate 2. The length of this air supply/discharge tube 25 is longer than the length that protrudes from the lower end plate 2 of the main column 6 when the long stroke air spring of the present invention is shortened to the shortest length, and is long enough so that the main column 6 does not touch it. It is.

Thus, the upper end plate 1 and the lower end plate 2 are connected by the engaging claw 10.2.
0 gold inside and facing each other with an appropriate interval, and four intermediate plates 3 are arranged between the upper end plate 1 and the lower end plate 2,
Between the intermediate plate 3 and the intermediate plate 6, and between the intermediate plate 3 and the upper end plate 1. Five bellows 4 are arranged between the lower end plate 2, and both ends of the bellows 4 are connected to the engaging claws 10, 2 of the upper and lower end plates 1, 2.
0 and the engaging claw 50 of the intermediate plate 3, and the engaging claw 50 of the intermediate plate 5 and the engaging claw 50 of the intermediate plate 5, respectively,
A cushion ring 5 is fitted into the valley of the bellows 4. The upper end of the main support 6 is fixed to the center of the lower surface of the upper end plate 1, and the main support 6 is passed through the through hole 32 of the intermediate plate 3 and the through hole 22 of the lower end plate 2, and the lower end of the main support 6 is fixed to the center of the lower surface of the upper end plate 1. is stored in the air supply/exhaust tube 25. Mounting plate 1 for the upper end plate 1
The upper end of the auxiliary support 7 is fixed to the lower surface of the auxiliary support 7, and the auxiliary support 7 is connected to the through hole 54 of the intermediate plate 3 and the through hole 2 of the lower end plate 2.
4, and a stopper 7 at the lower end of the auxiliary support 7.
Provided integrally with C1. A spring 8 is interposed between the intermediate plate 3 and the intermediate plate 5 and between the intermediate plate 5 and the lower end plate 2. That is, the spring 8 is loosely fitted to the auxiliary support column 7 from the outside, and both ends of the spring 80 are attached to the mounting plate 53 of the intermediate plate 3 and the mounting plate 53 of the intermediate plate 5.
and the mounting plate 25 of the lower end plate 2, respectively. An air hose or air pipe 26 from an air supply source (not shown) is connected to the lower end of the air supply/discharge tube 25 via a valve 27.

The long-stroke operating panel of the present invention in this embodiment is constructed as described above, and its operation will be explained below.

The lower end plate 2 is used as a fixed plate, and the other upper end plate 1 and intermediate plate 5 are used as elevating plates. First, air is supplied from the air supply source through the hose, air pipe 26, and pulp 27 into the air supply/exhaust tube 25. Then, the air supplied to the air supply/discharge tube 25 passes through the small through hole 22 for air circulation in the lower end plate 2, enters the bellows 8 in the first stage from the bottom, and then enters the bellows 8 in the first stage from the bottom. While pushing up 5, remove the first intermediate plate 6 from below.
It passes through the small through hole 52 for air circulation and enters the second bellows 8 from the bottom. Below, in the same manner, each bellows 8
Air enters into the spring, the upper end plate 1 and the intermediate plate 3 rise, and the air spring of the present invention is extended to its maximum length. At this time, the stopper 70 at the lower end of the auxiliary support column 7 whose upper end is fixed to the upper end plate 1 comes into contact with the lower end plate 2, so that the air spring of the present invention does not extend any further, and moreover, the gap between the intermediate plate 3 and the intermediate plate 5 Since the spring 8 is interposed between the intermediate plate 6 and the lower end plate 2, the interval between the upper end plate 1 and the intermediate plate 3, the interval between the intermediate plate 3 and the intermediate plate 5, and the intermediate plate The distance between the cushion ring 5 and the lower end plate 2 can be maintained at approximately equal intervals, so there is no risk that the above-mentioned distance will become too large and the cushion ring 5 will come off from the bellows 4, causing the bellows 4 to become punctured.

Next, when the air is removed, the upper end plate 1. Intermediate plate 6. Main pillar 6. Due to the weight of the auxiliary fork 7 and the elastic return force of the spring 8, the upper end plate 1 and the intermediate plate 3 are lowered, and the air spring of the present invention is contracted to the shortest possible length. Below, upper end plate 1° lower end plate 2. Bellows 4. By supplying air to the air chamber formed by the air supply/discharge cylinder 25 and then releasing it, the air buff straw of the present invention can be expanded and contracted. At this time, since the main support 6 as a guide passes through the center of the intermediate plate 5 and the lower end plate 2, when the upper end plate 1 and the intermediate plate 3 move up and down, the main support 6 passes through the center of the upper end plate 1 and the intermediate plate 2. Therefore, there is no possibility that the upper end plate 1 stitch and the intermediate plate 3 can be used as a guide for lifting and lowering, so that the vibrations of the lifting can be eliminated. In addition, small through holes 52 and 22' for air circulation are provided near the centers of the intermediate plate 6 and the lower end plate 2, so that when air flows into and out of each bellows 4, the air flows. This does not affect the bellows 4, which is arranged apart from the small through-holes 52 and 22, and therefore there is no risk that the bellows 4 will swing. This deflection of the bellows 4 and the above-mentioned upper end plate 1. By preventing the middle plate 3 from swinging, the upper end plate 1. Intermediate plate 6 and main support 6. Wear and damage to the auxiliary support 7 can be prevented.

FIG. 4 is a partial sectional view of the long stroke air spring of the present invention used in a sand pile making device.

This sand pile making device has 11 double pipes, and has 9 frames.
The lower end of a column 90 is fixed to the upper surface, and a lifting table 91 is attached to the column 90 so as to be movable up and down, and an exciter 92t is mounted on the lifting table 91. An outer casing 9 is attached to the lower surface of the pedestal 9.
5 is fixed, and the upper end of the inner casing 94 is fixed to the lower surface of the lifting table 91, and the inner casing 94t is passed through the center of the frame 9 and suspended into the outer casing 95. A hopper 95 for feeding sand is provided at the upper end of the outer casing 95.
On the other hand, a stopper 96t is provided at the upper end of the inner casing 94, and a jet nozzle 97 for discharging sand and a sand tamping body 98 are provided at the lower end of the inner casing 94, and a stopper 96t is provided at the lower end of the inner casing 94. It is suspended via an absorber 99.

Therefore, two long-stroke air springs of the present invention are interposed between the elevating table 91 and the pedestal 9. That is, the upper end plate 1t is fixed to the lower surface of the lifting table 91, and the male end plate 2 is fixed to the upper surface of the pedestal 9. Note that since the stopper 96 is provided on the inner casing 94, the stopper 70t at the lower end of the auxiliary column 7 may be removed.

The tomosand pile making device using the long stroke air spring of this invention can raise and lower the inner casing 94 with a long stroke, thus removing sand! ! Indeed, in the embodiment described above, the lower end plate 2 is used as a fixed plate, and the upper end plate 1 and the intermediate plate 31! -Although it is an elevating plate, the upper end plate 1 may be used as a fixed plate, or the intermediate plate 5 may be used as a fixed plate,
A metal plate may be used as an elevating plate.

Further, although the auxiliary support column 7 and the spring 8 are used as the connecting members, other wires or the like may be used.

Furthermore, although this embodiment is of a 15-stage type with four intermediate plates 3, it may also be of a so-called two-stage type with one intermediate plate 6, for example. Furthermore, the air spring of the present invention may be used for simple reciprocating movement from side to side, in addition to vertical movement.

As is clear from the above embodiments, the long stroke air spring of the present invention has a connecting member installed between the end plate and the intermediate plate or between the intermediate plate and the intermediate plate, so that the long stroke air spring can be easily extended during expansion. A predetermined distance can be maintained between the end plate and the intermediate plate or between the intermediate plates, so there is no risk of the bellows being overstretched and punctured.

Note that, as a matter of course, the long stroke air spring of the present invention is not limited to the above-described embodiments.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the long stroke air spring of the present invention, in which FIG. 1 is a cross-sectional view in an extended state, FIG. 2 is a cross-sectional view in a contracted state, and FIG. 6 is a cross-sectional view at I-1 in FIG. 4 is a partial cross-sectional view of the air spring all-sand pile building device of the present invention in use. 51... Upper end plate, 2... Lower end plate, 6... Intermediate plate,
4...Bellows, 5...Cushion ring, 6...
・Main pillar, 7...Auxiliary pillar, 8...Spring, 1
0, 20.50... Engaging claw, 21.51... Through hole,
22.52...Small through hole for air circulation, 1'), 25.
55...Mounting plate, 14, 24.54...Through hole, 25
...Mechanical 1oA supply and exhaust pipe, 26...Air hose, air pipe, 27...Harz, 70...Stopper. Patent applicant Naka Kurimoto Masashi Tomi Kurimoto Agent Patent attorney Masami Akimoto

Claims (1)

[Claims] One or more intermediate plates are arranged between two end plates, and bellows metal is expandable and airtight between the two end plates and the intermediate plate or between the intermediate plate and the intermediate plate. Intermediate,
A through hole for air circulation is provided at a location inside the bellows of the intermediate plate, and a hole is formed between the two end plates and the bellows, and air is injected into the 7'C air chamber (fc#). In particular, in a long-stroke air spring that expands and contracts over a long stroke, a linking member is interposed between the two end plates and the intermediate plate or between the intermediate plates, so that the two
1. A long stroke air spring characterized by being configured to open at a predetermined distance between two end plates and an intermediate plate or between two intermediate plates.