KR200340819Y1 - A buffer for elevator - Google Patents

Abstract

The present invention relates to an elevator shock absorber installed on the floor of an elevator hoisting, and more particularly, to provide an elevator shock absorber that can significantly reduce the production cost through the simplification and light weight of unnecessary parts.

To this end, in the present invention, when the plunger is lowered due to the fall of the elevator car, the oil filled in the cylinder flows out to the plunger side through the orifice, so in absorbing and dispersing the impact of the fallen elevator car, the base is joined by molding. An embossed portion having a hole was formed to protrude, a packing ring was provided between the cylinder and the plunger, and a lower cap formed to protrude a boss having an orifice was hermetically fixed to the lower portion of the plunger. And a molded oil pad is installed above the boss of the lower cap, and the upper cap is formed in the upper portion of the plunger to form a recess.

Therefore, the present invention is assembled using a base, a lower cap, an oil pad, an upper cap, and an injection molded packing ring produced by press molding, thereby drastically reducing the production cost and weight of the product required for the shock absorber. Therefore, there is a very useful effect to secure the price competitiveness of the product in response to the low-cost Chinese imported products.

Description

A buffer for elevator

The present invention relates to an elevator shock absorber installed on the floor of an elevator hoisting, and more particularly to an elevator shock absorber that can greatly reduce the production cost of the elevator shock absorber by simplifying and lightening unnecessary parts.

In general, elevators commonly installed in various buildings refers to a transportation device for transporting passengers or cargo because elevator cars installed in elevator hoists vertically lift or lower by towing of ropes. As such, the elevator may be broken due to the characteristics of lifting and lowering by the rope, or the braking may not be normally performed due to a defect such as an elevator braking device, in which case the elevator car descends and falls down, It will cause a big casualty.

Therefore, a buffer is installed at the bottom of all elevator lifts, and in particular, in the case of an elevator whose rated speed exceeds 60 m / min, a hydraulic buffer is installed to cushion and disperse the impact caused by the fall of the elevator car. Minimize the damage from accidents caused by the fall of the elevator car.

1 and 2 are cross-sectional views showing an example of a hydraulic shock absorber among the conventional shock absorbers for elevators, and the configuration thereof will be described. The formed tapered needle 30 is coupled, and the cylinder 40 having the elbow 41 and the plug 42 is fixed to the upper part of the cylinder 40 by welding on the base 20. The bush 50 is inserted and coupled.

And the inside of the bush 50, the plunger 60 which can slide up and down is inserted, and the cap 61 in which the orifice 61a was formed in the lower end of the plunger 60 is integrally fixed by welding. The upper portion of the cap 61 is provided with a spring shoe 62 is coupled to the needle 30 and the bolt 63, the return coil spring 64 is installed above the spring shoe 62. In addition, the flange 65 is fixed to the upper end of the plunger 60, the rubber 66 is fastened to the upper surface of the flange 65.

Therefore, in the conventional shock absorber 10 configured as described above, when the impact is applied to the rubber 66 according to the emergency fall of the elevator car C, the plunger 60 is filled in the cylinder 40 by lowering. This will increase the oil pressure. And since the filled hydraulic oil is discharged into the plunger 60 through the orifice 61a of the cap 61, the plunger 60 is lowered and absorbs the shock applied to the rubber 66.

Here, since the needle 30 has a tapered shape with a larger diameter toward the lower side, as the cap 61 is lowered, the gap between the needle 30 and the orifice 61a becomes narrower, and the flow rate of oil through the orifice 61a gradually increases. Will be reduced. Therefore, the descending speed of the plunger 60 is gradually reduced, thereby maximizing the shock absorption and dispersion effect of the emergency fall of the elevator car (C).

However, since the conventional elevator shock absorber uses steel having a thickness of about 2.5 cm as the base 20, a large cost is required for the purchase of thick steel, and the weight of the product is unnecessarily increased. Occurred. In addition, the countersinking process to be processed in the coupling hole 21 of the base 20 requires an additional processing step, thereby causing a problem of lowering the productivity of the base 20 and greatly increasing the production cost.

In addition, the conventional elevator shock absorber 10 uses a flange 65 produced by casting molding and post-processing, so that high costs such as raw materials, processing methods, and processing time are spent to increase the production cost of the product and reduce productivity. This occurred.

In addition, the conventional buffer buffer for elevator 10 is installed because the bush 50 for smooth lifting and lowering of the plunger 60, due to the high cost of the precision processing of the bush 50 and processing process for the elevator buffer 10 (10) There was a problem of increasing the cost of production.

Moreover, since the spring shoe 62 having a width of 20 mm is used to support the return coil spring 64 of the conventional elevator, various shapes such as cutting, drilling, etc. may be used due to the shape characteristic of the spring shoe 62. Due to the processing process, there is a problem of further raising the production cost of the product.

In addition, since the base 20, the flange 65, and the spring shoe 62 used in the conventional elevator shock absorber 10 are made of steel such as flat steel, the shock absorber 10 for elevators is used. The total weight of was increased to force the use of a large diameter needle (30). As a result, the production cost and weight of the product were further increased to reduce the competitiveness of the product, and due to the deepening of price competitiveness, most of the product was produced in China and imported into Korea, resulting in the collapse of the domestic industrial base.

The present invention was devised to solve the conventional problems as described above, an object of the present invention is to provide a shock absorber for elevators that can significantly reduce the production cost through downsizing, such as simplifying and lightweighting unnecessary parts To provide.

1 is a cross-sectional view showing the structure of a conventional shock absorber for an elevator,

2 is a cross-sectional view showing an operating state of a conventional buffer for an elevator;

3 is a cross-sectional view showing the structure of an elevator shock absorber of the present invention,

4 is a cross-sectional view showing an operating state of the shock absorber for an elevator of the present invention,

Figure 5 is a bottom perspective view showing a packing ring applied to the shock absorber for an elevator of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: shock absorber 200: base

210: coupling hole 220: embossed portion

300: needle 400: cylinder

410: elbow 420: ring groove

500: packing ring 510: body

520: groove 530: inner seal lip

540: outer seal lip 600: plunger

610: lower cap 611: orifice

612: boss 620: oil pad

630: Bolt 640: Return coil spring

650: upper cap 651: depression

660: rubber 661: bolt

C: elevator car

The elevator buffer of the present invention for achieving the above object is to absorb and disperse the impact of the crashed elevator car because the oil filled in the cylinder flows to the plunger side through the orifice when the plunger is lowered due to the fall of the elevator car. A base comprising: a base formed by protruding an embossed portion having a coupling hole; A packing ring installed between the cylinder and the plunger; A lower cap which protrudes and forms a boss having the orifice and is fixedly installed under the plunger; An oil pad formed by molding and installed above the boss of the lower cap; It characterized in that it comprises an upper cap coupled to the upper portion of the plunger by forming a recess to facilitate coupling with the upper portion of the return coil spring.

Hereinafter, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view showing the structure of an elevator buffer of the present invention, as shown in the elevator buffer 100 of the present invention is largely the base 200, the cylinder 400, the packing ring 500, the plunger 600 It is composed of

First, the base 200 is fixedly installed at the bottom of the hoistway of an elevator. The base 200 is produced by press molding a plate such as steel sheet, and together with an embossing part 220 having a coupling hole 210 at the center of the base 200. Molding is formed. The tapered needle 300 having a smaller diameter is coupled to the coupling hole 210.

The cylinder 400 is fixedly installed at the center of the upper surface of the base 200 by welding or the like. An elbow 410 is installed at a portion of the outer surface, and ring grooves 420 are formed at two upper portions of the inner surface.

As shown in FIG. 5, the packing rings 500 are respectively inserted into the ring grooves 420 of the cylinder 400 to fill the gap between the cylinder 400 and the plunger 600 with oil filled in the cylinder 400. It is prevented from leaking to the outside. The packing ring 500 is injection molded by rubber or synthetic resin, and a groove 520 is formed at a lower portion of the body 510, and both the inner lip 530 and the outer lip 540 are formed at both sides of the groove 520. Is formed.

The plunger 600 is inserted into the cylinder 400 and is lowered by the collision of the elevator car C. The lower cap 610 is hermetically installed at the lower portion of the plunger 600 by welding or the like. The lower cap 610 is produced by press molding a plate such as a steel sheet, the boss 612 having an orifice 611 in the center is formed.

And the upper portion of the needle 300 is inserted into the orifice 611, the upper portion of the needle 300 and the oil pad 620 is fastened with a bolt 630, the upper portion of the oil pad 620 (return coil spring ( 640 is installed.

In addition, the upper cap 650 is coupled to the upper end of the plunger 600 to cover the upper portion of the plunger 600. The upper cap 650 is press-molded by a steel sheet or the like, and formed a recess 651 in the center to be combined with the upper portion of the return coil spring 640. In addition, the rubber 660 is fastened and installed at the center of the upper surface of the upper cap 650 by using a bolt 661.

Referring to the operation and effects of the present invention configured as described above in detail.

As shown in FIG. 3, when an impact is applied to the rubber 660 by an emergency fall of the elevator car C, the rubber 660 absorbs the impact to the plunger 600 side through the upper cap 650. The impact of the fall of the elevator car (C) is transmitted. Therefore, the plunger 600 lowers the pressure of the oil filled in the cylinder 400 while descending along the cylinder 400 as shown in FIG. 4, and the oil whose pressure is momentarily increased is plunger 600 through the orifice 611. ) Is spilled inside.

Accordingly, the plunger 600 is lowered at a gradually slow speed by the flow rate of the oil filled in the cylinder 400 to the plunger 600 side to absorb the impact of the fall of the elevator car (C).

Here, since the needle 300 has a tapered shape having a larger diameter toward the lower side, the gap between the needle 300 and the orifice 611 becomes narrower as the plunger 600 is lowered. Therefore, the flow rate of the oil through the orifice 611 is gradually reduced to gradually reduce the descending speed of the plunger 600 to maximize the shock absorption and dispersion effect of the emergency fall of the elevator car (C).

In particular, the present invention, since the packing ring 500 is installed on the inner upper portion of the cylinder 400 as shown in Figure 5, when the pressure of the oil filled in the cylinder 400 as the plunger 600 is lowered, The oil inside the cylinder 400 presses and closes the inner seal 530 toward the plunger 600 in proportion to the increased pressure.

Therefore, the hydraulic oil filled in the cylinder 400 flows out into the plunger 600 only through the orifice 611 without flowing out through the gap between the cylinder 400 and the plunger 600, and thus the plunger 600. While falling down normally within the falling speed and section calculated during the design of the shock absorber 100 is effectively absorbed and dispersed the impact of the fall of the elevator car (C).

On the other hand, when the elevator car (C) is removed from the rubber 660 of the plunger 600, the plunger 600 is raised by the elastic restoring force of the return coil spring 640, the oil inside the plunger 600 is a cylinder Spilled to the 400 side. In addition, since the oil pressure in the cylinder 400 is extinguished, the pressing force of the internal lip 530 in close contact with the plunger 600 is also eliminated, so that the oil pressure in the cylinder 400 is in close contact with the plunger 600 with the usual elastic pressing force. The win is made smoothly.

As such, the present invention uses a packing ring 500 that is injection molded to prevent the outflow of oil filled in the cylinder 400, and thus, unlike the bush 50 of the prior art, the product cost is drastically reduced. Therefore, the structure of the shock absorber 100 is simplified and the production cost is greatly reduced.

In addition, the buffer shock absorber 100 of the present invention is a base 200, a lower cap 610, which is press-molded using a thin steel sheet, without using steel such as flat steel used in the prior art, Since the oil pad 620 and the upper cap 650 are used, the material cost required for the shock absorber 100 is drastically reduced, and the weight of the shock absorber 100 is greatly reduced.

And the present invention is embossed 220 and the coupling hole 210 in the base 200 is molded together in the press molding production process, so no additional additional processing process, such as the conventional countersinking process. Therefore, not only the productivity and cost reduction of the base 200, but also the productivity and cost of the shock absorber 100 are greatly reduced.

In addition, in the case of the lower cap 610, the oil pad 620, the upper cap 650, as in the base 200, additional processing is almost unnecessary due to the characteristics of press molding production. Therefore, compared with the cap 61, the spring shoe 62, the flange 65 of the prior art, while significantly reducing the production cost of the parts, the productivity is greatly increased.

In addition, the present invention greatly reduces the weight of the shock absorber 100 according to the use of the press-produced base 200, the lower cap 610, the oil pad 620, and the upper cap 650. Compared to 30), the needle 300 having a smaller diameter can be used to further reduce the production cost and weight of the shock absorber 100.

On the other hand, the above-described embodiment is merely to explain an example of a preferred embodiment of the present invention, the scope of application of the present invention is not limited to such, and can be changed appropriately within the scope of the same idea. For example, the installation of the packing ring may be provided below the outer side of the plunger in addition to the upper side of the inner side of the cylinder.

As described above, the present invention uses a base plate, a lower cap, an oil pad, and an upper cap produced by press molding using a steel sheet, and is also assembled using a packing ring produced by injection molding. It will dramatically reduce the cost and weight of the product. Therefore, there is a very useful effect to secure the price competitiveness of the product in response to the low-cost Chinese imported products.

In addition, the present invention is the base, the lower cap, the oil pad, the upper cap is produced by the press molding, almost no additional processing process. Therefore, the machining process of the parts is greatly reduced, thereby further reducing the production cost of the product.

Claims (2)

In the case where the plunger is lowered due to the fall of the elevator car, since the oil filled in the cylinder flows out to the plunger side through the orifice, in absorbing and dispersing the impact of the crashed elevator car, A base 200 formed by protruding the embossing part 220 having the coupling hole 210; A packing ring 500 installed between the cylinder 400 and the plunger 600; A lower cap 610 which is formed by protruding and forming a boss 612 having the orifice 611 in a lower part of the plunger 600; An oil pad 620 formed by molding and installed above the boss 612 of the lower cap 610; The shock absorber for elevator, characterized in that it comprises an upper cap (650) formed on the upper portion of the plunger (600) by forming a recessed portion (651) to facilitate coupling with the upper portion of the return coil spring (640). The shock absorber according to claim 1, wherein the base (200), the lower cap (610), the oil pad (620), and the upper cap (650) are press-molded.