JPH0289788A - Hydraulic jack for hydraulic elevator - Google Patents

Abstract

PURPOSE:To make the content volume of a cylinder relatively small and make the vertical varying quantity of a lifting up/down body relatively small by providing a stopper member which is movable in the radial direction via a pressing device or a suction device. CONSTITUTION:By appropriately operating a power unit, a plunger 11 is moved up/down to move a lifting up/down body vertically to an appropriate position. At this time, generally, a plunger 11 is not lifted up to where a stopper member 35 is positioned to the height position of a pressing device 47. Hence, a stopper pressing member 37 does not move the stopper member 35 in the radial direction. However, when the plunger 11 is about to be lifted up to where the stopper member 35 is brought to the height position of the pressing member 47 for some reason or other, the stopper pressing device 37 is appropriately operated to move the stopper member 35 in the radial direction, thereby preventing the plunger 11 from being separated from a cylinder 9.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a hydraulic jack for a hydraulic elevator, and more specifically, even if a stopper member is provided on the plunger of the hydraulic jack, the cylinder The present invention relates to a hydraulic jack for a hydraulic elevator whose internal volume can be made relatively small.

(Prior Art) A hydraulic jack 101 in a conventional hydraulic elevator will be described with reference to FIG. 6.

A boat 105 is placed at an appropriate position in the cylinder 103 with an inner diameter of dl.
An upper filO'7 of the cylinder 103 is provided above the cylinder 103. Above top lid 1
07 is provided with a plunger 111 having a diameter d2 and extending vertically through a gasket 109 so as to be vertically movable. At the upper end of the plunger 111, an elevating body (not shown) that constitutes a part of the elevator is provided.

Therefore, by supplying hydraulic pressure into the cylinder 103 via the boat 105 or discharging the hydraulic pressure within the cylinder 103, the plunger 111 can be moved up and down, and the elevating body is moved up and down.

Since the plunger 111 is not removed from the cylinder 103, the lower end of the plunger 111 has no contact with the plunger 111.
Disc-shaped stopper member 11 with a diameter d3 larger than the diameter of 1
3 is provided. Therefore, the plunger 111 rises and the upper surface 113a of the stopper member 113
The plunger 111 does not come off from the cylinder 103.

(Problem to be Solved by the Invention) By the way, in general, the cylinder 103 of the hydraulic jack 101
There is a gap g1 at a predetermined interval between the plunger 111 and the plunger 111.
need to be formed. During elevator installation work, even if the cylinder 103 or granger 111 is bent or bent due to installation error, and both axes are misaligned, the system absorbs the misalignment and allows the plunger 111 to move during operation.
This is provided to prevent collision noise, impact noise, or wear caused by the outer circumferential surface of the cylinder 103 contacting and colliding with the inner circumferential surface of the cylinder 103.

However, in the conventional hydraulic jack 101 as described above, since the stopper member 113 larger than the diameter of the plunger 11 is provided at the lower end of the plunger 111, the outer peripheral surface of the stopper member 113 comes into contact with the inner peripheral surface of the cylinder 103. ,
In other words, the inner diameter of the cylinder 103 was enlarged to provide a gap larger than the gap gl to prevent collision.

Therefore, the internal volume of the cylinder 103 increases, and the amount of hydraulic pressure filled in the cylinder 103 increases accordingly, so the compression phenomenon of hydraulic pressure becomes noticeable, and the lifting body moves up and down due to changes in the weight inside the lifting body. It has changed. This is proven by the following equation.

In other words, the amount of vertical fluctuation ΔH of the elevating body due to the weight change ΔW of the elevating body is Δ I−I = K “ α ° Δ W
′ A ·. Here, K is a coefficient determined by the structure, α is the oil pressure coefficient a, ■ is the volume of pressure oil in the cylinder, and A is the pressure receiving area of the plunger.

Therefore, as mentioned above, since ΔH is proportional to V, as the volume of the pressure oil in the cylinder 103 increases, the amount of vertical fluctuation of the elevating body due to a change in the weight inside the elevating body increases, and passengers There has been a problem in that the weight inside the elevating body changes each time a passenger gets on or off, causing the elevating body to move up and down, causing anxiety and discomfort to passengers.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention aims to provide a hydraulic jack for a hydraulic elevator, which allows the inner volume of the cylinder to be relatively small even when a stopper member is provided on the plunger. .

[Structure of the Invention] (Means for Solving the Problems) In order to solve the conventional problems as described above, the present invention provides a plunger and a cylinder for vertically moving an elevating body in a hydraulic elevator. In the hydraulic jack in the hydraulic elevator, a stopper member movable in the radial direction is provided near the upper end of the plunger, and a pressing device or the like is provided near the upper end of the cylinder for pressing the stopper member in the radial direction. is equipped with a suction device for pulling the stopper member in the radial direction.

(Function) In the above Q configuration, pressure oil is supplied into the cylinder,
By discharging the pressure oil in the cylinder, the granger is moved up and down, and the elevating body is moved up and down as appropriate.

When the plunger rises to a predetermined position, the pressing device operates appropriately to press the stopper member in the radial direction, or the suction device operates appropriately to pull the stopper member in the radial direction. , the stopper member moves appropriately in the radial direction and comes into contact with the cylinder at an appropriate position. This prevents the plunger from leaving the cylinder.

(Example) Referring to FIG. 5, the elevating body 3 in the hydraulic elevator 1 is guided in the vertical direction by a guide bar 5 provided at an appropriate position and extending in the vertical direction.

In order to move the elevating body 3 in the vertical direction, the upper end of a plunger 11 that can freely protrude upward from a cylinder 9 in a hydraulic jack 7 buried underground is connected to an appropriate position on the lower surface of the elevating body 3. .

In order to supply and discharge hydraulic pressure into the cylinder 9, a power unit 17 comprising an oil tank 13 and a pump 15 is provided at an appropriate position.
and a pump 15 are connected via piping 19.

With the above configuration, the elevating body 3 rises by supplying pressure oil into the cylinder 9 by appropriately operating the power unit 17, and by discharging the hydraulic pressure in the cylinder 9, the elevating body 3 descends due to its own weight. do.

For details on the hydraulic jack 7, see FIGS. 1, 2, and 3.

At the top of the cylinder 9 is a top cover 2 of the cylinder 9.
1, and the plunger 11, which extends vertically through a gasket 23, is provided on the upper lid 21 so as to be vertically movable. The plunger 11 is hollow and has an outer diameter D2, and there is a gear between the inner peripheral surface of the cylinder 9 and the outer peripheral surface of the plunger 11, so that even if the axes of the plunger 11 and the cylinder 9 are misaligned for some reason, , the outer circumferential surface of the granger 11 does not come into contact with or collide with the inner circumferential surface of the cylinder 9.

A stopper mounting member 25 having approximately the same outer diameter as the cylinder 9 is provided at the lower end of the plunger 11, and an annular stopper 27 is formed on the stopper mounting member 25.

More specifically, a fixing member 29 of the stopper mounting member 25 is provided at the lower end of the plunger 11, and a protrusion 31 having an outer diameter D1 is formed on both of the fixing members. A lid member 33 is screwed onto the protrusion 31 of the fixing member 29, thereby forming the annular stopper 27.

A ring-shaped stopper member 35 is provided in the annular spring 27 of the stopper mounting member 25 so as to be movable in the radial direction, and the outer diameter of this stopper member 35 is approximately the same DI as the outer diameter of the grunge 11. .

Furthermore, since the inner diameter of the stopper member 35 is D4, there is a gap between the inner circumferential surface of the stopper member 35 and the outer circumferential surface of the protruding portion 31 of the fixing member 29. Due to the above structure, the appropriate position of the stopper member 35 can be adjusted in the radial direction. By appropriately pressing the stopper member 35, the stopper member 35 moves in the radial direction by the gap G2. Therefore, the position of the stopper member 35 on the opposite side to the pressed position protrudes by the gap G2 as shown in FIG.

In order to move the stopper member 35 in the radial direction,
A stopper pressing device 37 is provided at an appropriate position above the cylinder 9.

More specifically, a through hole 9 is provided at an appropriate position in the upper part of the cylinder 9.
a is formed, and a hollow base member 39 is provided at the peripheral edge of this through hole 9a. A support member 41 and a spring 4 are provided in the through hole 9a and the hole 39a of the base member 39.
3 is provided, and a plug 45 is provided at the end of the base member 39.
are screwed together. Further, a pressing member 47 that is slidable on the outer circumferential surface of the plunger 11 is supported by the support member 111 . Note that the pressing member 47 has a spherical or cylindrical shape.

With the above configuration, while the plunger 11 is rising inside the cylinder 9, the pressing member 4 in the stopper pressing device 37
7 is the plunger 11 against the biasing force of the spring 43.
Press the outer peripheral surface of the When the stopper member 35 is positioned at the height of the pressing member 47, the pressing member 47
7 presses the outer peripheral surface of the stopper member 35, and the stopper member 35 moves in the radial direction. As a result, the upper surface 35a of the stopper member 35 and the lower surface 21a of the upper lid 21 come into contact with each other, and the plunger 11 does not separate from the cylinder 9.

By the way, FIG. 3 shows the hydraulic jack 7 when the elevating body 3 is located at the top floor, and generally, even when the elevating body 3 is located at the top floor, the connection between the upper lid 21 and the stopper member 35 is There is a gap 1-1 between them, and the suppressing member 47 does not press the stopper member 35 in the radial direction.Here, the above II is generally called a margin stroke, and the elevating body 3 cannot be raised to the top floor for some reason. If this is not possible, the stroke is enough to allow the elevating body 3 to rise to the top floor.

The operation of the embodiment will be explained based on the above-mentioned configuration.

By appropriately operating the power unit 17, the plunger 11 moves up and down, and the elevating body 3 moves up and down to an appropriate position.

At this time, generally the stopper member 35 is
The plunger 11 does not rise until it is located at the height position 7, so the stopper pressing device 37 does not move the stopper member 35 in the radial direction.

However, if for some reason the granger 11 attempts to rise until the stopper member 35 reaches the height position of the pressing member 47, the stopper pressing device 37 operates as appropriate to move the stopper member 35 in the radial direction and push the plunger 11 upward. This prevents the cylinder from separating from the cylinder 9.

As described above, according to this embodiment, the outer diameter of the stopper member 35 is set to be approximately the same as the inner diameter of the cylinder 9, and the stopper member 35 is made movable in the radial direction via the stopper pressing device 31, so that the inner diameter of the cylinder 9 is The gap G1 can be made smaller than the gap in the cylinder of a conventional hydraulic jack equipped with a stopper member having a diameter larger than the diameter of the plunger, and the internal volume of the cylinder 9 can be made smaller. Therefore, the amount of pressure oil in the cylinder 9 can be made relatively small, and the amount of vertical fluctuation of the elevating body 3 due to changes in the weight of the elevating body 3 can be made relatively small.

In the present invention, if the stopper member 35 is made of metal, an attraction device such as a magnet may be provided instead of the stopper suppressing device 37.

[Effects of the Invention] As described above, according to the present invention, by providing the stopper member that is movable in the radial direction via the pressing device or the suction device, the stopper member having a diameter larger than the diameter of the plunger can be moved. The internal volume of the cylinder can be made relatively smaller than that in a conventional hydraulic jack. Therefore, the amount of pressure oil in the cylinder can be made relatively small, and the amount of vertical fluctuation of the elevating body due to changes in the weight of the elevating body can be made relatively small.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 shows the lower part of the hydraulic jack, Fig. 2 shows the upper part of the hydraulic jack, and Fig. 3 shows the elevating body when it is located at the top floor. A diagram showing the upper part of the hydraulic jack, Fig. 4 is an explanatory diagram of the action when the stopper member moves in the radial direction, Fig. 5 is a schematic diagram of a hydraulic elevator, and Fig. 6 is a diagram showing a conventional hydraulic jack. It is. 1...Hydraulic elevator-7 3...Elevating body 7...
Hydraulic jack 9... Cylinder 11... Granger 35... Stopper member 37... Stopper pressing device

Claims (1)

[Claims] In a hydraulic jack for a hydraulic elevator equipped with a plunger and a cylinder for vertically moving an elevating body of the hydraulic elevator, a stopper member movable in the radial direction is provided near the lower end of the plunger, and the upper end of the cylinder is provided with a stopper member movable in the radial direction. A hydraulic jack for a hydraulic elevator, characterized in that a pressing device for pressing a stopper member in a radial direction or a suction device for pulling a stopper member in a radial direction is provided nearby.