KR200452263Y1

KR200452263Y1 - Lifting Jack

Info

Publication number: KR200452263Y1
Application number: KR2020100003026U
Authority: KR
Inventors: 박희광
Original assignee: (주)수성테크
Priority date: 2010-03-24
Filing date: 2010-03-24
Publication date: 2011-02-14

Abstract

The present invention relates to a lifting jack, and more particularly, to a lifting jack that can be transported along the lead screw when the lifting and lowering of heavy materials such as a railway vehicle on the inclined surface to prevent the wear of the main nut supporting the load of the railway vehicle, A support frame 100, a lead screw 120 provided in the support frame 100 and driven axially by the drive unit 110, and a hanger part fastened to the lead screw 120 and driven up and down ( In the lifting jack comprising a 130, the upper end of the lead screw 120 is suspended in a hanger type on the upper end of the support frame 100 so that the lower end of the lead screw 120 is free to rotate in the centrifugal direction. As a structure, even when the working floor surface is not in the exact horizontal state, the lead screw is always vertically oriented by its own weight, so the screw itself remains vertical so that the railway At the time of elevating the amount of the vehicle and keeping it horizontal, it is intended that the effect of preventing the wear of the main nut is a large load acts.

Description

Lifting jacks {Lifting jack}

The present invention relates to a lifting jack, and more particularly to a lifting jack that allows to lift a heavy object such as a railroad car to the upper surface safely.

In general, in order to inspect or repair a railroad car, a worker cannot directly enter the railroad car and work on it. Therefore, using a lifting jack, the lifting jacks are mounted on the front, rear, left, and right sides of the railroad car, and lifted to a certain height. To remove and assemble the trolley.

The overall configuration of a conventional lifting jack for this purpose consists of a lead screw driven by a drive unit and a main nut screwed to the lead screw to transfer the hanger arm up and down by rotational drive of the lead screw.

The lifting jacks configured as described above are positioned at the front, rear, left, and right sides of the railway vehicle, and then fix the hanger arms to the lower portion of the railway vehicle. Next, when the lead screw is rotated and driven, the main nut is moved upwards, and the hanger arm supporting the railroad car is lifted to raise the railroad car upward.

However, such a conventional lifting jack is difficult to maintain the horizontal state of the lifted vehicle if the lifting jack is not installed perpendicular to the ground when the working floor surface is horizontal, and the main nut fastened to the lead screw has aggravated wear. The problem arises.

Specifically, since the vehicle is not leveled in the process of lifting and lowering the railroad car, the main nut fastened to the lead screw directly acts as the load of the railroad car with a large load, so if the main nut is worn or damaged, the main nut is lowered. There is a risk of rolling over.

Therefore, in order to prevent the wear of the main nut while keeping the vehicle horizontal, the ground and the lifting jack should be installed vertically to minimize the wear of the thread during the transfer process of the main nut.

However, since the conventional lifting jack is provided with bearings at the upper end and the lower end of the lead screw, respectively, and is fixed to the support frame so as to rotate only in the axial direction, when the ground of the work space is not a horizontal plane, they are installed at the front, rear, left, and right sides of the railway vehicle. The problem arises that the lead screw is to be vertical by adjusting the inclination of the supporting frame itself of the lifting jack.

The present invention is intended to solve the above-mentioned shortcomings, and even when the floor surface is not an accurate horizontal state, the lead screw of the lifting jack is parallel to the lifting direction of the railway vehicle within a certain angle range, the horizontal state of the vehicle It is intended to provide a lifting jack that can maintain the pressure and minimize the wear of the main nut.

Lifting jack of the present invention for achieving this purpose and the support frame; A lifting jack comprising a lead screw provided in the support frame and axially driven by a drive unit, and a hanger part fastened to the lead screw to be driven up and down, wherein the lower end of the lead screw is in a centrifugal direction. It is achieved by a structure in which the upper end of the lead screw is suspended in a hanger type on the upper end of the support frame so as to be freely rotatable.

As described above, the lifting jack of the present invention has a structure in which the upper end of the lead screw is suspended in the hanger type at the upper end of the support frame so that the lower end of the lead screw can be freely rotated in the centrifugal direction. Since it is vertically downward, the lead screw and the direction of the rail car are in parallel with each other, and the main nut can be prevented from being worn.

In addition, the lifting jack of the present invention does not have a separate support structure at the lower end of the lead screw, it is possible to quickly replace the main nut without removing the lifting jack or additional hoist, the design that can increase the work efficiency It is

1 is a side view of the lifting jack of the present invention,
2 is a front view of the lifting jack of the present invention,
3 is a cross-sectional view showing a fastening structure of the support frame and the lead screw in the lifting jack of the present invention.

1 to 3 is a view showing a lifting jack of the present invention, Figure 1 is a side view of the lifting jack of the present invention, Figure 2 is a front view of the lifting jack of the present invention, Figure 3 is a lifting jack of the present invention Is a cross-sectional view showing the fastening structure of the support frame and the lead screw.

An embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Lifting jack of the present invention and the support frame 100; The support frame 100 is provided with a lead screw 120 is axially rotated by the drive unit 110, and the hanger 130 is fastened to the lead screw 120 by a spring pin is driven up and down displacement In the known lifting jack, the upper end of the lead screw 120 is suspended in a hanger type to the upper end of the support frame 100 so that the lower end of the lead screw 120 is free to rotate in the centrifugal direction. It is a technical feature to become.

The support frame 100 includes a vertical frame 101 and a horizontal frame 102 fixed to an upper end of the vertical frame 101.

First and second limit switches 101a and 101b are provided at upper and lower ends of the vertical frame 101 to limit the height of the hanger 130, respectively.

The driving unit 110 is for driving the lead screw 120, and may be configured as a speed reducer mounted with a brake.

The hanger unit 130 is screw-fastened to the lead screw 120 to support and lift the railroad car.

The hanger 130 may include a nut 135 directly screwed to the lead screw 120; Horizontal transfer is possible by the transfer handle 131, it may be composed of a hanger arm 132 for supporting a railway vehicle.

The nut part 135 is composed of a main nut and a safety nut positioned at a lower end of the main nut and fastened to a lead screw. The safety nut serves as the main nut when the main nut breaks.

The hanger unit 130 is provided with guide rollers 133 and 134 to guide the hanger unit 130 at the time of vertical driving.

Referring to FIG. 3, the bracket 103 is fastened to the horizontal frame 102 by the first bolt 104, and the driving unit fixing base 111 is fastened to the bracket 103 by the second bolt 105. .

The drive unit for rotating the lead screw 120 is fixed to the upper portion of the drive unit fixing base 111.

In particular, the bracket 103 and the fastening hole of the driving unit fixing base 111 are larger than the diameter of the second bolt 105, and the driving unit fixing base 111 is configured to have a clearance within a predetermined range in the horizontal direction. It is desirable to.

The upper end of the lead screw 120 is inserted into the hollow cylindrical bearing housing 140, and the lead screw 120 and the bearing housing 140 are fixed to each other through the spring pin 141.

The bearing housing 140 is mounted on the self-aligning tapered roller bearing 150 and fixed to the upper side of the support frame 100.

Self-aligning tapered roller bearing 150 is provided with a conical roller 151 to support the load in the radial direction and axial load.

As described above, in the lifting jack of the present invention, only the upper end of the lead screw 120 has a structure in which the self-aligning tapered roller bearing 150 is suspended in the hanger type at the upper end of the support frame, and the lower end of the lead screw 120 is provided. Is configured to allow free rotation.

When the lifting jack of the present invention configured as described above is positioned on the inclined surface, the lead screw 120 is positioned such that the lower end is always directed vertically by its own weight.

That is, according to the degree of inclination of the bottom surface, the lower end of the lead screw is always oriented vertically downward by its own weight, so that the direction of the lead screw and the direction of lifting and lowering of the railway vehicle are parallel to each other, and to prevent wear of the main nut. There is a number.

<Explanation of symbols for the main parts of the drawings>
100: support frame 110: drive unit
120: lead screw 130: hanger
140: bearing housing 141: spring pin
150: self-aligning tapered roller bearing

Claims

The support frame 100, the lead screw 120 provided in the support frame 100 and axially driven by the drive unit 110, and screwed by the lead screw 120 and the nut part 135 In the lifting jack comprising a hanger 130 which is driven up and down displacement,
Lifting jack, characterized in that the upper end of the support frame (100) is suspended in the hanger type structure so that the lower end of the lead screw 120 is free to rotate in the centrifugal direction.

The spring pin 141 of claim 1, wherein an upper end of the lead screw 120 is inserted into a hollow cylindrical bearing housing 140 and passes through the lead screw 120 and the bearing housing 140. Fixed by the bearing housing 140 is mounted on the self-aligning tapered roller bearing 150 is fixed to the upper portion of the support frame (100).