JPH0532319B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an underground autolift in which a vehicle cradle is provided at the upper end of each ram of a pair of lift cylinders buried underground, and in particular a vehicle cradle. This invention relates to a device that raises and lowers objects in synchronization with each other.

[Prior art]

A conventional underground autolift tuning device is disclosed in Japanese Patent Publication No. 56-33319, for example.
The upper ends of a pair of rack bars extending parallel to each ram are fixed to each vehicle cradle, and pinions at both ends of a synchronizing shaft supported by the frame are engaged with the racks of the rack bars to synchronize the left and right vehicle cradle. Each rack bar is moved up and down inside a cylindrical rack cover buried underground parallel to the lift cylinder.

[Problem that the invention seeks to solve]

In such conventional technology, since the rack cover is buried underground, it is easy for floor washing water and groundwater containing mud to enter the rack cover, and this muddy water adheres to the rack cover and causes rust. Rust got stuck between the pinion and the pinion that meshed with it, causing wear and tear on these parts and reducing their durability. The present invention aims to improve the durability of this type of underground autolift by improving the tuning device buried underground.

[Means for solving problems]

For this purpose, the buried autolift according to the present invention, as shown in the embodiment of the attached drawings, has a pair of lift cylinders 11 and 12 vertically buried in the ground. In the buried autolift provided with vehicle holders 13 and 14, the upper ends of a pair of synchronized shafts 15 and 16 extending parallel to the rams 11a and 12a are fixed to the vehicle holders 13 and 14, respectively. The lower ends of the tuning shafts 15 and 16 are respectively fixed to both ends of a tuning beam 17 extending in the horizontal direction,
A vertically extending box-shaped tuning case 18 that forms a space for storing and moving this tuning beam is buried underground, and the upper end of each tuning shaft 15, 16 is connected to the tuning case 18 through a sealing device 20.
It is characterized by projecting upward from the upper wall of the.

[Effect]

When hydraulic pressure is supplied to each lift cylinder 11, 12, each vehicle cradle 1, which is integrally connected by synchronized shafts 15, 16 and a synchronized beam 17,
3 and 14, even if there is a difference in the operating resistance of the lift cylinders 11 and 12 and the load applied to each vehicle cradle 13 and 14, they rise in synchrony with each other, and also remove hydraulic pressure to lift each vehicle cradle 13. , 14 are also lowered by gravity in synchronization with each other. Vehicle cradle 1
Simultaneously with the lifting and lowering of 3 and 14, the synchronized shaft 15 and 1
6 is sealed by a sealing device 20 and moves up and down, and the tuning beam 17 moves up and down inside the buried tuning case 18 and does not appear on the ground.

〔Effect of the invention〕

According to the present invention, each vehicle cradle 13, 14
synchronized shafts 15, 16 that synchronize the vertical movement of
Since the tuning beam 17 is only fixed to each vehicle cradle 13, 14, and there is no part that engages with gears or the like, the tuning shafts 15, 16 are simple and have a constant cross-sectional shape. Therefore, the sealing device 20 reliably seals between the tuning shafts 15, 16 and the upper wall of the tuning case 18, thereby preventing floor washing water or underground water from entering into the tuning case 18 buried underground. This prevents the tuning shafts 15, 16 and the tuning beam 17 from rusting, improving their durability, and also prevents resistance from floor washing water etc. from acting on the vertical movement of the tuning beam 17. This will not adversely affect operation. In addition, the tuning beam 17 is connected to the tuning case 18.
Since the vehicle does not go up and down inside and appears on the ground, it does not become an obstacle when performing maintenance or inspection of the underside of a lifted vehicle placed on the vehicle cradle 13, 14.

〔Example〕

FIGS. 1 and 2 show an embodiment of a two-post underground autolift, in which a pair of left and right lift cylinders 11 and 12 are vertically buried underground. Each lift cylinder 11, 12 has a ram 11a, 12a that can be raised and lowered, and each ram 11
Horizontal and mutually parallel vehicle supports 13 and 14 are fixed to the upper ends of a and 12a. Each ram 11a, 12a is provided on one side of each lift cylinder 11, 12.
A pair of tuning shafts 15 and 16 are positioned, extending parallel to each other, and the upper ends of each tuning shaft 15 and 16 are fixed to the lower surfaces of the vehicle supports 13 and 14, respectively, and the lower ends of the tuning shafts 15 and 16 are fixed to the lower surfaces of the vehicle cradle 13 and 14, respectively, and the lower ends are connected to the tuning beam 1, which has a longitudinal cross-sectional shape and extends in the horizontal direction.
It is fixed at both ends of 7. As a result, the left and right vehicle rests 13 and 14 are connected to each other via the tuning shafts 15 and 16 and the tuning beam 17, and when the lift cylinders 11 and 12 operate, the vehicle rests 1
3, 14, the tuning shafts 15, 16, and the tuning beam 17 move up and down in unison with each other. The tuning shafts 15, 16 and the tuning beam 17 are preferably provided as close to the lift cylinders 11, 12 as possible. A vertically extending box-shaped tuning case 18 is buried underground between one side of both lift cylinders 11 and 12, and this tuning case 18 has a space in which the tuning beam 17 is housed and raised and lowered. is forming. An opening 18a extending over the entire surface is provided on the upper side of the tuning case 18 to accommodate the tuning beam 17 therein, and is covered by a cover plate 19 forming the upper wall of the tuning case 18. A tuning shaft 1 made of a polished round rod is mounted on the cover plate 19.
Two holes are provided through which 5 and 16 pass and are sealed by a sealing device 20. Seal device 2
As shown in FIG. 3, the tuning shaft 1 is made of an elastic material such as rubber and is slidable with some interference.
5 and 16, a bracket 20b for positioning and supporting the dust seal 20a on the cover plate 19, and a holding plate 20c.

As shown in FIG. 2, a hole is drilled in the concrete 24 on the floor to provide a buried recess 25 reaching underground, and the outer frame 21 is fixed with concrete 26 or the like. Lift cylinder 11,
12 and the tuning case 18 are supported by a support frame 22 integrated with an outer frame 21 and buried in a buried recess 25, and the gap is filled with sand 27 or the like. The upper part of the outer frame 21 is a closing plate 23
This creates a working plane that is approximately at the same height as the floor. Closure plate 23 and tuning shaft 1
A seal 28 is provided between the closing plate 23 and the lift cylinders 11 and 12, and a gasket 29 is provided between the closing plate 23 and the lift cylinders 11 and 12 to prevent floor washing water or the like from entering the buried recess 25.

Next, to explain the hydraulic circuit that operates the lift cylinders 11 and 12, as shown in FIG. It is connected to the lift cylinders 11 and 12 via stop valves 33 and 34, respectively, and the suction side is connected to an oil tank 39. Furthermore, pilot operated check valves 35 and 36 for discharging hydraulic oil are connected in parallel with the hydraulic pumps 31 and 32 and the check valves 33 and 34, respectively. Note that each hydraulic pump 31, 32 is provided with a pressure relief valve 37, 38.

When the pump drive motor 30 operates, the hydraulic pumps 31 and 32 operate simultaneously, supplying the oil in the oil tank 39 to the lift cylinders 11 and 12 via the check valves 33 and 34, respectively, as shown in FIG. As shown by the two-dot chain line, the vehicle supports 13 and 14 are raised together with the vehicle (not shown). Since the vehicle supports 13 and 14 are integrally connected by the tuning shafts 15 and 16 and the tuning beam 17 as described above, the operating resistance of each lift cylinder 11 and 12 and each vehicle support 1 are
Even if there is a difference in the loads applied to 3 and 14, the heights rise synchronously without causing any difference in height. Furthermore, hydraulic oil is supplied separately to the lift cylinders 11 and 12 that raise each vehicle cradle 13 and 14 by hydraulic pumps 31 and 32, so that both vehicle cradle 13 and 14 are synchronized. Helping you rise. If the pump drive motor 30 is stopped while the vehicle supports 13 and 14 are raised, the hydraulic fluid in the lift cylinders 11 and 12 will flow through the check valves 33 and 3.
4 prevents the discharge, so the vehicle cradle 13,1
4 is held in the elevated state. Tuned beam 17
is located within the tuning case 18 even in this state, so it does not become an obstacle when performing maintenance or inspection of the underside of the lifted vehicle placed on the vehicle cradle 13, 14. Next, when both the pilot operated check valves 35 and 36 are opened simultaneously by the descending signal, the hydraulic oil in the lift cylinders 11 and 12 is released by the weight of the vehicle and the vehicle cradle 13 and 14, respectively. The vehicle receivers 13 and 14, which are discharged from the vehicle 36 and are integrally connected to each other, are lowered in synchronism.

Note that, as in the above embodiment, a pair of hydraulic pumps 3
1,32 to each lift cylinder 15,1
If hydraulic oil is supplied separately to 6, it is possible to improve the synchronization of both vehicle supports 13 and 14, especially when ascending.

[Brief explanation of the drawing]

The drawings show an embodiment of the buried autolift according to the present invention, FIG. 1 is an overall perspective view and a diagram of a hydraulic circuit, and FIG.
The sectional view, FIG. 3, is an enlarged view of the - section in FIG. 2. Explanation of symbols 11, 12...Lift cylinder,
11a, 12a... Ram, 13, 14... Vehicle cradle,
15, 16... Tuning shaft, 17... Tuning beam,
18... Tuning case, 20... Seal device.

Claims (1)

[Claims] 1. In an underground autolift in which a vehicle cradle is provided at the upper end of each liftable ram of a pair of lift cylinders buried vertically in the ground, the upper end of a pair of synchronized shafts extending parallel to each ram is A vertically extending box-shaped tuning box is fixed to each of the vehicle pedestals, and the lower end of each tuning shaft is fixed to both ends of a tuning beam extending horizontally, forming a space in which the tuning beam is housed and moved. An underground autolift characterized in that the case is buried underground, and the upper end of each of the tuning shafts is made to protrude upward from the upper wall of the tuning case via a sealing device.