KR100242488B1 - Telescopic device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic multilevel elevating apparatus, and in particular, by employing a chain as a transmission means, it can be manufactured at low cost, requires low maintenance costs, and enables accurate operation control. The multistage elevating device includes: a first cylinder that is standing up, a second cylinder that is concentrically installed with a predetermined transmission space in a radial direction within the first cylinder, and is movable up and down on an inner wall surface of an upper region of the first cylinder. A first electric sprocket installed, a drive sprocket rotationally driven by a drive motor, and a closed loop connected between the electric sprocket and the drive sprocket, a part of which is fixed to a lower region of the second cylinder, And a first electric chain that lifts and lowers the second cylinder relative to the first cylinder when the sprocket rotates.

Description

Telescopic Multistage Lift Device {}

The present invention relates to a telescopic multi-level lifting device, and more particularly, to a multi-stage lifting device employing a chain as a transmission means.

Telescopic multi-stage elevating devices generally have a large number of small diameter cylinders which are mutually combined so as to be telescopically telescopically movable, and as the transmission means, mainly hydraulic pressure is adopted to be able to elevate by pressure oil supplied into the cylinder. However, hydraulic devices require relatively expensive parts such as hydraulic motors and valves, and in particular, sophisticated sealing means must be provided to prevent leakage of oil, and high machining precision is required for cylinders. Thus, the overall manufacturing cost of the device is very high, and in addition, maintenance costs are associated with sealing.

On the other hand, multi-stage elevating devices have been developed to allow each cylinder to move up and down by using a rope transmission mechanism, but it is difficult to expect accurate transmission due to slip between the rope and the sieve, and a single rope is continuously driven to drive the entire cylinder. Therefore, in case of breakage due to aging of the rope, it may be inoperable or cause a big accident.

Accordingly, it is an object of the present invention to provide a telescopic multi-stage lifting apparatus which can be manufactured at low cost, low in maintenance cost, and capable of accurate operation control.

1 is a front view showing an example of a multi-stage lifting apparatus according to the present invention,

Figure 2 is a schematic perspective view for explaining the operation of the multi-stage lifting device of FIG.

3 is a schematic front view for explaining the lifting motion of the second cylinder,

Figure 4 is a schematic front view for explaining the lifting motion of the third cylinder,

5 is a plan view of the multi-stage lifting device,

6 is a plan view of the limiter device.

* Explanation of symbols for main parts of the drawings

10: donation 11: support flange

12: drive motor 17: drive sprocket

20: first cylinder 21: first electric sprocket

22: first electric chain 30: second cylinder

36: second electric sprocket 37: second electric chain

40: third cylinder

The object of the present invention is to provide a first cylinder to be erected, a second cylinder which is concentrically installed with a predetermined transmission space in a radial direction within the first cylinder, and is movable up and down, and an upper region of the first cylinder. A first electric sprocket installed on an inner wall surface of the first sprocket, a drive sprocket rotationally driven by a drive motor, and a closed loop connected between the electric sprocket and the drive sprocket, a part of which is fixed to a lower region of the second cylinder. And a first electric chain for elevating the second cylinder with respect to the first cylinder when the drive sprocket rotates. As a result, at least two-stage chain-driven telescopic multi-stage lifting devices can be obtained.

The three-stage multistage elevating device includes a third cylinder which is installed concentrically with a predetermined transmission space in a radial direction in the second cylinder and is movable up and down, and a second electric sprocket installed on an inner wall surface of the upper end region of the second cylinder. And one end is fixed to the lower end region of the third cylinder, and the other end is fixed to the bottom of the first cylinder via the second electric sprocket so that the third cylinder is moved to the second cylinder when the second cylinder is elevated. It is achieved by further including a second electric chain for elevating.

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

1 is a front view of a chain-driven multi-stage lifting device according to the present invention applied for lifting support of a lighting lamp to be suitable for installation for lighting of a golf course.

As can be seen in this figure, the present multistage elevating device is sequentially provided with respect to the lowermost box-shaped base 10, the first cylinder 20 fixedly standing up to the base 10, and the first cylinder 20. And a second cylinder 30 and a third cylinder 40 which are inserted to be liftable. At the upper end of the third cylinder 40, a lamp frame 50 to which a plurality of lamps 51 are attached is fixed. Each cylinder 20, 30, 40 is stretched telescopically like a telescope to lift the lamp frame 50.

Figure 2 is a perspective view schematically shown to explain the mechanical configuration of the multi-stage lifting device.

The base 10 has a rectangular cylindrical shape as a whole, and a support flange 11 for supporting the first cylinder 20 is installed in a horizontal direction in a central region therein. In the lower part of the support flange 11, a drive shaft 14 capable of forward and reverse driving and a drive shaft 14 rotating by a reduction sprocket 15 connected to a motor sprocket 13 rotating by the drive motor 12 are provided. have. A pair of drive sprockets 17 are coupled to both sides of the drive shaft 14 to drive the first electric chain 22 to be described later.

The first cylinder 20 is installed upright on the support flange 11, and a portion of the support flange 11 forms an inner flange 23 of the first cylinder 20 at the bottom thereof.

The second cylinder 30 is liftably received in the first cylinder 20 with a considerable transmission space in the radial direction, and at the lower end thereof extends radially inward with an outer flange 31 extending radially outward. The inner flange 38 is provided.

In the transmission space between the 2nd cylinder 30 and the 1st cylinder 20, the 1st electric sprocket 21 provided in the inner wall surface of the upper end area of the 1st cylinder 20, and this electric sprocket 21 And a pair of first electric chains 22, each of which connects between the driving sprockets 17 in the base 10 and the driving sprockets 17, are symmetrically received. A part of the first electric chain 22 is separated, and both ends of the first electric chain 22 are connected to the tension bolts 33 and 34 fixed to the upper and lower surfaces of the outer flange 31 provided at the lower end of the second cylinder 30, respectively. It is. The outer flange 31 of the second cylinder 30 is provided with a passage slot 32 through which the line on the unfixed side of the first electric chain 22 passes, and the inner side of the first cylinder 20. The flange 23 is also provided with a passage slot 24 correspondingly.

3 is a schematic front view for explaining the chain transmission mechanism between the first cylinder 20 and the second cylinder 30. The lifting principle of the second cylinder 30 will be described with reference to FIG. 2. When the drive motor 12 operates to rotate the drive sprocket 17 in one direction, the first electric chain 22 circulates between the drive sprocket 17 and the first electric sprocket 21. However, since a part of the first electric chain 22 is fixed to the lower end of the second cylinder 30, the second cylinder 30 corresponds to the circulation direction of the first electric chain 22 so that the first cylinder ( 20) up or down movement will be performed. On the other hand, the idle sprocket 18 is provided in the base 10 to compensate for the difference in diameter between the drive sprocket 17 and the first electric sprocket 21 to keep the first electric chain 22 in parallel.

Referring back to FIG. 2, the third cylinder 40 is concentrically accommodated in the second cylinder 30. The third cylinder 40 has a radial transmission space with respect to the second cylinder 30, and an outer flange 41 extending radially outward is provided at the lower end thereof. The second electric sprocket 36 is provided on the inner wall surface of the upper end of the second cylinder 30, and the second electric sprocket 36 is wound around the second electric chain 37. As shown in FIG. The second electric chain 37 is fixed to the tension bolt 43, one end of which is fixed to protrude from the upper surface of the outer flange 41, the other end of the tension bolt provided on the inner flange 23 of the first cylinder (20). It is fixed to 44 to form an open loop. In the inner flange 38 of the second cylinder 30, a passing slot 39 for passing the second electric chain 37 is formed.

4 is a schematic front view for describing an interlocking relationship between the second cylinder 30 and the third cylinder 40. Referring to this figure in conjunction with FIG. 2, the second electric sprocket fixed to the second cylinder 30 when the second cylinder 30 is raised, for example, by the operation of the drive motor 12 as described above. (36) also rises, so that the second electric chain 37, one end of which is fixed to the lower end of the third cylinder 40 and the other end of which is fixed to the bottom of the first cylinder 20, forms an open loop. Since the length is finite, it is tensioned and raises the third cylinder 40 relative to the second cylinder 30. When the second cylinder 30 descends, on the contrary, the second electric chain 37 relaxes and the third cylinder 40 descends.

5 is a plan view illustrating guide rollers for maintaining concentricity between cylinders. In this figure, the guide rollers 51 and 52 which are omitted for convenience of description in FIG. 2 are shown. Four guide rollers 51 are installed between the first cylinder 20 and the second cylinder 30 at an angle of 90 degrees in the transmission space, respectively. These guide rollers 51 are fixed to the inner wall surface of the first cylinder 20 to guide the second cylinder 30 to move up and down concentrically with respect to the first cylinder 20. The first electric sprocket 21 is disposed between the guide rollers 51. Similar to the guide roller 51 between the first cylinder 20 and the second cylinder 30, the four guide rollers 52 are disposed between the second cylinder 30 and the third cylinder 40, so that the concentricity between the two cylinders 30 and 40. Keep it.

6 is a plan view of the limiter device. If the drive motor 12 is continuously driven beyond the rising and falling limits, there is a risk that the electric parts such as the motor and the chain may be damaged. Therefore, a limiter device that can properly block the operation of the motor 12 at the lifting and lowering limits is very high. It is important. The limiter device 60 has a fixing plate 61 that can be fixed inside the base 10 and a pair of support plates 62 and 63 fixed horizontally and parallel to the fixing plate 61. The screw shaft 64 is supported by the support plates 62 and 63 so that rotation is possible horizontally, and the driven sprocket 65 is couple | bonded with this screw shaft 64. As shown in FIG. The driven sprocket 65 is connectable to the motor sprocket 13 or the drive sprocket 17, thereby rotating the screw shaft 64. The screw shaft 64 is coupled with a slider 66 having a female thread engaged with the male screw of the screw shaft 64, so that the screw shaft 64 reciprocates sliding along the reverse rotation of the screw shaft 64. A working arm 67 extends in the slider 66, and a guide bar 68 passes through the working arm 67 to guide the working arm 67 to move with the slider 66 without rotating. On the free end side of the working arm 67, a pair of limit switches 69 and 70 are provided on both end sides of the moving stroke of the working arm 67. As shown in FIG. One of these limiter switches 69, 70 serves for the rising limit and the other serves for the lower limit, which actuates the drive motor 12 when the working arm 67 is in contact. Then, the movement stroke of the slider 66 may be appropriately set in consideration of the reduction ratio between the drive side and the driven sprocket, the lifting stroke of the second cylinder 30, and the like. Accordingly, when the driven sprocket 65 is rotated by the rotation of the drive motor 12, the slide 66 and its working arm 68 move to operate the limit switches 69 and 70 to drive the drive motor 12. This prevents excessive operation.

As described above, the multi-stage lifting device of the present invention allows the cylinders 20, 30, and 40 to be relative relative to each other by using a chain, so that the movement is accurately transmitted and accurate stroke control is possible, while lifting only one cylinder. Can be raised and lowered in conjunction with the lifting movement of the cylinder. In addition, since one or more pairs of transmission parts can be provided symmetrically with each other, there is no possibility that a sudden inoperable state or an accident may be caused even if any one of the breakages occurs.

According to the present invention, there is provided a telescopic multi-stage elevating apparatus which can be manufactured inexpensively, requires less maintenance cost, and enables accurate operation control as compared with the conventional hydraulic multi-stage elevating apparatus.

Claims (2)

(Correction) in the multi-stage lifting device, The first cylinder, which is standing up, A second cylinder which is installed concentrically with a predetermined transmission space in a radial direction in the first cylinder and can be elevated; A first electric sprocket installed on an inner wall surface of the upper region of the first cylinder; A drive sprocket rotated by the drive motor, A first loop connected between the electric sprocket and the driving sprocket with a closed loop, the upper part being fixed to a lower region of the second cylinder, and lifting and lowering the second cylinder relative to the first cylinder when the driving sprocket is rotated; Multi-stage lifting device comprising an electric chain. The method of claim 1, A third cylinder which is installed concentrically with a predetermined transmission space in a radial direction in the second cylinder and can be elevated; A second electric sprocket installed on an inner wall surface of the upper region of the second cylinder; One end is fixed to the lower region of the third cylinder, and the other end is fixed to the bottom of the first cylinder via the second electric sprocket so that the third cylinder is lifted with respect to the second cylinder when the second cylinder is lifted. Multi-stage lifting device comprising a second electric chain.

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