KR101258741B1 - Floodgate lifter using damper - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lifting device for a wristwatch for damping a downward speed which can prevent collision of a watercourse descending upon closure of a watercourse. According to the present invention, there is provided a driving apparatus comprising: a driving member for providing driving force; An elevator that lifts and closes the water gate by the driving force of the driving member; And a damper installed adjacent to the elevator to provide a lift to the elevator to damp down a descending speed of the elevator. The present invention provides a damper that damages the descending speed of the elevator to the elevator to damp down the descending speed of the elevator, so that it is possible to mitigate the impact of the descending descent by the elevator.

Description

[0001] FLOODGATE LIFTER USING DAMPER [0002] BACKGROUND OF THE INVENTION [0003]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lifting device for a wristwatch for damping a downward speed which can prevent collision of a watercourse descending upon closure of a watercourse.

Generally, the water gate opening / closing device is installed in a medium, small reservoir, a river channel, and an agricultural water channel in order to secure water resources, and the amount of water is controlled according to the open state of the opening and closing device.

1, a conventional water gate opening and closing apparatus is provided with a frame-shaped handlebar 2 across a water channel, and a rack bar 3 is provided on an upper portion of a gate 1 ascending and descending from the gatebar 2 And the rack bar 3 is constituted by being engaged with a sprocket connected to a speed reducer 4 driven by a driving device 5 provided on the upper part of the barrel 2.

Therefore, the sprocket is rotated forward or backward by the speed reducer 4 driven by the drive unit 5, whereby the rack bar 3 is lifted and lowered.

At this time, the rack bar 3 is provided with a plurality of fins at regular intervals in a channel steel of the same shape as 'c', and these pins are caught by the gear mountains of the sprocket.

However, in the conventional water gate opening / closing apparatus, since the rack bar 3 does not densely form the pitch of the fins due to the characteristics of the sprocket, the movement of the rack bar 3 is rapidly performed by the pins formed at wide pitches when the sprocket is driven And it is not easy to control the elevation speed of the gate (1). Therefore, in the conventional water gate opening / closing apparatus, the control of the water gate 1 is not easy due to the rapid movement of the rack bar 3, so that the collision between the water gate 1 and the water gate 2 in the closing operation of the water gate 1 There is a problem that durability of the water gate 1 and the rack bar 3 is lowered due to frequent occurrence of twisting of the water gate 1, water leakage of the water hole, deflection of the rack bar 3,

Particularly, since the descending speed of the descending gate 1 when the gate 1 is closed can not be relaxed, there is a problem that the impact of the gate 1 and the gate 2 can not be weakened.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a lift device for a descending speed damping device capable of damping a descending impact of a descent by generating a reaction force corresponding to descending speed of a descent The purpose is to do that.

Particularly, a member for generating a reaction force can absorb the shock of the watercraft while being operated by the pressure of the fluid, and furthermore, the pressure of the fluid can be controlled by manually or automatically controlling the flow rate of the fluid, Another object of the present invention is to provide a lifting platform for a descending speed damping which can buffer an impact transmitted to a member generating a reaction force by descending the door.

Another object of the present invention is to provide a lifting and lowering device for descending speed damping capable of lifting and lowering a sluice gate by a gear-structured member.

In particular, it is possible to raise and lower the sluice gate by means of a member constituting a rod-shaped gear while being assembled in a line and composed of a plurality of segments to be divided, and furthermore, Another purpose is to provide a lift platform for speed damping.

According to an aspect of the present invention, there is provided a driving apparatus including: a driving member for providing driving force; An elevator that lifts and closes the water gate by the driving force of the driving member; And a damper installed adjacent to the elevator to provide a lift to the elevator to damp down a descending speed of the elevator.

The damper is a hydraulic shock absorber which is provided adjacent to the elevator and is compressed by the descent of the elevator, and provides a reaction force to the elevator by the pressure of the fluid filled in the damper.

The hydraulic shock absorber includes a plurality of rods that are stretched and contracted at one end by the elevator; A piston connected to the other end of the rod; An elastic body for elastically supporting the piston and returning the piston to an original position; A hydraulic cylinder in which the elastic body and the piston are housed and the fluid is filled; An orifice formed in the hydraulic cylinder and communicating the fluid filled in the hydraulic cylinder to the inside or outside of the hydraulic cylinder; And a fluid tank in which fluid communicated with the orifice is stored.

The hydraulic shock absorber includes a plunger whose one end is pressed and expanded by the elevator; A coil spring for supporting the other end of the plunger; A hydraulic orifice formed in fluid communication with the other end of the plunger; And a cylinder in which the fluid moving through the hydraulic orifice is filled and the elastic body is embedded.

The hydraulic shock absorber may further include a buffer member for buffering an impact applied to the hydraulic cylinder, wherein the buffer member includes: a plate-shaped base mounted on a lower portion of the hydraulic cylinder; And an elastic plate mounted on a lower portion of the base.

The hydraulic shock absorber further includes a flow control valve installed in the orifice to control a flow rate of the orifice.

Wherein the flow control valve comprises: a bolt threadably coupled to the fluid tank; And a cap coupled to an end of the bolt to open and close the orifice.

Wherein the flow control valve includes: a hollow tube coupled to the orifice and having a flow path for fluid movement; An orifice tube made of an elastic material that has a cross-sectional area reduced due to an increase in the flow rate of the fluid in a state of being inserted into the flow path to form a variable flow path; A cover installed on the other side of the flow path to prevent the orifice tube from being disengaged when the flow rate of the fluid increases at one side; And a washer disposed on one side of the orifice tube to press the orifice tube when the flow rate of the fluid is increased.

The elevator includes at least one rack wheel rotated by the driving member; And a rack, one end of which is engaged with the rack wheel, and the water gate is coupled to the other end and moved by the rack wheel to lift the water gate.

The rack includes: a slice gear formed in a plate-like shape and having a gear tooth formed on one side thereof, the slice gear being formed as a plurality and superimposed on each other and having a straight rod shape; At least one shaft passing through the slice gears; A one-end fastener for integrally fixing one end of the shaft to one end of the rod-shaped slice gear; And a second end fastener for integrally fixing the other end of the shaft to the other end of the slice gear.

The one end fastener and the other end fastener are each a nut or a nut shaft screwed to both ends of the shaft.

In the damper according to the present invention, since the damper damps the descending speed of the elevator by providing the elevator with a reaction force for buffering the descending speed of the elevator, the shock of descending by the elevator can be alleviated.

Particularly, since the damper is constituted by the hydraulic shock absorber which is operated by the pressure of the fluid, the impact of the shock absorber can be moderately mitigated by the cushion action of the fluid. In addition, the orifice or the plunger of the hydraulic shock absorber Since the hydraulic orifice is formed, the impact can be further mitigated, and the rod can be returned to the original position by the elastic body. Therefore, the rod can be automatically returned when the elevator is lifted. Further, the buffer member absorbs the impact transmitted to the hydraulic shock absorber The hydraulic shock absorber can be protected from impact.

In addition, since the flow control valve controls the flow rate of communication with the orifice of the hydraulic cylinder, the shock absorbing force of the hydraulic shock absorber can be adjusted to a desired size. Further, when the flow control valve is composed of a bolt and a cap, Alternatively, the flow control valve can be automatically and easily operated when the flow control valve is configured such that the flow rate is controlled by the orifice tube which is expanded and contracted by hydraulic pressure.

Further, when the elevator is constituted by a rack wheel and a rack, it is possible not only to slow down the descending speed of the drawbar due to the gear characteristics of the racks and rack wheels interlocked with each other but also to raise and lower the elevator stably, When the rack is constituted, the slice gears are assembled in a row to form a rod-shaped gear, so that it is possible to provide a rack-type rack having no limit in length, When the fastener and the other end fastener are constituted by a nut or a nut shaft, both end portions of the rod-shaped slice gear can be easily assembled and closed.

1 is a front view showing a conventional hydrologic apparatus.
2 is a perspective view showing a lift device having a damper according to an embodiment of the present invention;
Fig. 3 is an exploded perspective view showing the hydraulic shock absorber of Fig. 2; Fig.
Fig. 4 is a view showing embodiments of the hydraulic control valve and the cross section of Fig. 2. Fig.
FIG. 5 shows the operation of FIG. 4;
6 is a view showing the operation of the fluid control valve shown in the enlarged perspective view of FIG.
7 is a view showing an operation of a hydraulic shock absorber according to another embodiment of the present invention.
FIG. 8 is a diagram showing a radial scale applied to the present invention; FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings.

2, the present invention is characterized in that the present invention comprises a driving member M for providing a driving force, an elevator which is raised and lowered by the driving force of the driving member M and which is integrally connected to an elevator and an elevator, And a damper 30 for damping a descending speed of the elevator by providing a reaction force to the elevator.

Here, the driving member M may be a motor. And the motor is installed in the gear box GB provided on the upper part of the male housing 2 as shown.

The elevator is meshed with at least one rack wheel 10a and rack wheel 10a which are rotated by the driving member M and one end is engaged with the rake wheel 10a and the water gate is coupled to the other end and is moved by the rack wheel 10a, And a rack (10) for raising and lowering the rack (10).

At this time, the rack wheel 10a and the rack 10 may be constructed of pinion and racetracks, or may be constructed of a sprocket and a racetrack of the scepter.

The rack wheel 10a is installed inside the gear box GB and the rack 10 is installed through the gear box GB. Thus, the rack 10 is raised while the upper end protrudes to the upper portion of the gear box GB.

Meanwhile, the damper 30 may be a hydraulic shock absorber 33 provided adjacent to the elevator, which is compressed by the descent of the elevator and provides a reaction force to the elevator by the pressure of the fluid filled therein.

3, the hydraulic shock absorber 33 includes a plurality of rods 33a, a piston 33b connected to the other end of the rod 33a, and a piston 33b elastically supporting the piston 33b to return to the original position A hydraulic cylinder 33d in which the elastic body 33c and the piston 33b are filled and which is filled with the fluid and the fluid which is formed in the hydraulic cylinder 33d and filled in the hydraulic cylinder 33d, An orifice 33e communicating with the inside or outside of the cylinder 33d and a fluid tank 33f storing the fluid communicated with the orifice 33e.

The hydraulic shock absorber 33 may be configured to include a shock absorber 31 for buffering an impact applied to the hydraulic cylinder 33d. At this time, the buffer member 31 may include a plate-shaped base 31a mounted on a lower portion of the hydraulic cylinder 33d and an elastic plate 31b mounted on a lower portion of the base 31a.

As shown, the base 31a is located on the top of the elastic plate 31b. At this time, the elastic plate 34 is preferably a synthetic rubber having elasticity. Therefore, the shock absorber of the hydraulic shock absorber 33 is relieved by the elastic plate 31b at the time of damping.

Further, the fluid tank 33f is located at the top of the base 31a. At this time, the fluid tank 33f is composed of an inner tube 33f 'and an outer tube 33f' having diameters different from each other. The hydraulic cylinder 33d is positioned to be inserted into the fluid tank 33f. At this time, the hydraulic cylinder 33d is composed of an inner cylinder 33d 'and an outer cylinder 33d', which have different diameters from each other.

The elastic body 33c may be a coil spring that applies a compressive force in the vertical direction. The piston 33b may be a coil spring, The piston 33b is formed in a ring shape and is inserted into the hydraulic cylinder 33d so that the piston 33b is inserted into the hydraulic cylinder 33d. .

In addition, the rods 33a are installed at equal intervals on the upper portion of the piston 33b. Here, the fluid tank 33f is shielded at the upper portion by a shielding plate 33g in a ring shape. The rods 33a are installed so as to pass through the shielding plate 33g. Therefore, the shielding plate 33g guides the rods 33a to move vertically. At this time, it is preferable that the shield plate 33g is provided with an oil seal for preventing oil leakage through the rod 33a.

As shown in the figure, the elastic plate 31b, the base 31a, the fluid tank 33f, the hydraulic cylinder 33d, the elastic body 33c, the piston 33b and the shielding plate 33g are sequentially joined to each other 10).

Referring to Fig. 4, the rack 10 is in a state of passing through the gear box GB. The buffer member 31 is located on the upper portion of the gear box GB. At this time, the rack 10 is inserted into the hole formed at the center of the buffer member 31. [

The inner cylinder 33d 'of the hydraulic cylinder 33d is inserted into the outer cylinder 33d "and fixed to the base 31a while being spaced from each other. The elastic body 33c is fixed to the inner cylinder 33d' Is received between the cylinders 33d ", and the lower end is supported by the base 31a. At this time, the elastic body 33c elastically supports the lower portion of the piston 33b inserted into the inner cylinder 33d 'and the outer cylinder 33d' '.

The inner tube 33f 'of the fluid tank 33f is inserted into the outer tube 33f' and fixed to the base 31a while being spaced apart from each other. At this time, the hydraulic cylinder 33d is accommodated and accommodated between the inner tube 33f 'and the outer tube 33f', that is, inside the fluid tank 33f. Since the hydraulic cylinder 33d is provided with a cylindrical outer cylinder 33d "on the outside of the cylindrical inner cylinder 33d 'as shown in the figure, the fluid, the elastic body 33c and the piston 33b.

Since the lower end of the hydraulic cylinder 33d and the fluid tank 33f are fixed to the base 31 and closed, the fluid can be filled in each of them. At this time, the inner tube 33f 'and the outer tube 33f' are made higher than the outer cylinder 33d ''.

Further, the fluid is moved from the fluid tank 33f to the upper portion of the piston 33b while being discharged through the orifice 33e. Here, the fluid is preferably an oil that is incompressible. Further, the orifices 33e may be formed in a plurality of cylinders 33d.

On the other hand, the upper plate 32 is fixed to the upper end of the rack 10. Thus, the top plate 32 is positioned on the top of the rod 33a.

5, the upper plate 32 is lowered together with the rack 10 to press the rods 33a. The rods 33a are pressed by the upper plate 32 to press the piston 33b. Then, the piston 33b presses the elastic body 33c and compresses the fluid filled in the cylinder 33d. At this time, the orifice 33e discharges the fluid and moves to the fluid tank 33f. Further, since the orifice 33e is moved only at a limited flow rate even if the flow rate is increased by the pressure of the piston 33b, the discharged flow rate is kept constant. Therefore, the descent rate of the rack 10 is kept constant by the fluid communicated to the orifice 33e.

Further, the piston 33b is raised by the elasticity of the elastic body 33c when the rack 10 is lifted, and returned to the original position.

At this time, the damper 30 is operated by the upper end of the rack 10 provided on the lower portion of the gear box GB. That is, the damper 30 performs damping at the upper portion of the rack 10. Thus, the damper 30 damps the descending speed of the rack 10 by providing a reaction force to the upper end of the rack 10 before the water gate hits the bottom of the barrel 2. The damper 30 is protected from the outside by the cover C.

4, the hydraulic shock absorber 33 may further include a flow control valve 35 installed in the orifice 33e to control the flow rate of the orifice 33e. That is, the flow control valve 35 controls the opening / closing degree of the orifice 33e to control the flow rate of the flow.

At this time, the flow control valve 35 includes a bolt 35a which is screwed to the fluid tank and moves; And a cap 35b coupled to an end of the bolt 35a to open and close the orifice. Here, it is preferable that the cap 35b is made of a synthetic rubber which can secure the closed state of the orifice 33e and prevent leakage of the fluid. The cap 35b may be formed in a wedge shape or a conical shape.

Therefore, the cap 35b regulates the opening state of the orifice 33e according to the degree of tightening of the bolt 35a, thereby adjusting the amount of the fluid flowing out through the orifice 33e. At this time, it is preferable that the flow control valve 35 adjusts the opening degree of the orifice 33e in advance in consideration of the descending speed depending on the weight of the water gate and the rack 10 and the like.

4, the flow control valve 35 is connected to the orifice 33e and has a hollow tube 35a and a flow path 35b formed with a flow path 35b for fluid movement, An orifice tube 35c of an elastic material which forms a variable flow path by reducing the sectional area due to the increase of the flow velocity of the fluid in the inserted state and an orifice tube 35c which is provided on the other side of the flow path 35b, And a washer 35e which is disposed on one side of the orifice tube 35c and presses the orifice tube 35c when the flow rate of the fluid is increased.

Here, the hollow tube 35a can be configured to be screwed to the orifice 33e.

The orifice tube 35c is formed in a donut shape and is disposed in the flow path 35b, but is not released to the outside through the small diameter inlet 35 '. Also, since the outlet 35 "is provided with the cover 35d, the orifice tube 35c is not released to the outside through the outlet 35". At this time, the cover 35d is formed with a through hole having a diameter smaller than the diameter of the inlet 35 'so that the fluid is moved in the center. And the cover 35d can be screwed to the outlet 35 "

Referring to FIG. 6, the washer 35e and the orifice tube 35c are sequentially coupled in the hollow tube 35a. At this time, the cover 35d may be configured to be screwed to the hollow tube 35a.

Since the inlet 35 'formed at one side of the hollow tube 35a is connected to the outlet 35' 'formed at the other side of the hollow tube 35a, the fluid 35b is supplied to the inlet 35' And discharges it to the outlet 35 ". At this time, the inlet 35 'is formed with a smaller diameter than the outlet 35' '.

Further, when the flow rate of the fluid passing through the orifice 33e increases, the fluid passes at a high speed, so that the pressure applied to the inside of the orifice tube 35c hole is reduced. At this time, since the orifice tube 35c contracts and its inner diameter becomes narrower, the fluid passes through the hole of the orifice tube 35c while the flow rate is increased.

Then, the washer 35e is pressed by the fluid whose flow rate is increased to compress the orifice tube 35c. Therefore, the orifice tube 35c is further contracted by the urging of the washer 35e, and the inside diameter of the orifice tube 35c is further narrowed.

In other words, the orifice tube 35c is shrunk to a diameter smaller than the diameter of the inlet 35 'by shrinkage. Thus, the orifice tube 35c reduces the flow rate. Further, the orifice tube 35c is expanded to the original state when the discharged fluid flows back.

7, the hydraulic shock absorber 33 includes a plunger 331 that is stretched and contracted at one end by the upper end of the rack 10, a coil spring 332 that supports the other end of the plunger 331, And a cylinder 334 filled with a fluid moving through a hydraulic orifice 333 and a hydraulic orifice 333 formed in fluid communication with the other end of the plunger 331 and incorporating a coil spring 332 .

The plunger 331 is composed of a plurality of plungers 331 and is located below the upper plate 32 provided on the rack 10 above the gear box GB described above.

The plunger 331 is lowered by the pressure of the upper plate 32 to compress the fluid. At this time, the plunger 331 is lowered at a low speed because a small amount of fluid moves through the hydraulic orifice 333. Therefore, the upper plate 32 is descended while the descending speed is attenuated by the hydraulic pressure shaver 33.

Further, since the coil spring 332 applies an elastic force to the plunger 331 when the rack 10 rises, the plunger 331 is raised and returned.

8, the rack 10 includes a plurality of slice gears 11, a shaft 12 inserted side by side with a plurality of slice gears 11 engaging with each other, And one end fastener 14 and the other end fastener 16 for fixing one end and the other end of the plurality of slice gears 11. The slice gear 11, the shaft 12, the one-end fastener 14, and the other end fastener 16 are preferably made of metal.

The slice gear 11 is formed of a plate material, a gear tooth 13 is formed on one side, and a through hole 15 is formed in the center. At this time, it is preferable that the slice gear 11 is formed in a disc shape so as to have a structure for uniformly distributing the pressure.

The fastener 14 is a nut, and the other end fastener 16 is a nut shaft in which a female screw acid is formed at an end portion. The fastener 14 and the other end fastener 16 are screwed to both ends of the shaft 12 to form a slice gear 11 fitted to the shaft 12, Are fixed to both ends of the shaft (30). When the fastener 14 and the other end fastener 16 are formed of a nut or a nut shaft, both end portions of the rod-shaped sliced gear 11 can be easily closed in a prefabricated manner.

Also, since the shafts 30 are composed of a plurality and are coupled to the slice gears 11, the slice gears 11 are not rotated about the shafts 30.

In addition, the shaft 30 may have a surface formed on one side, or may be formed in a polygonal or rectangular shape in cross section, whereby the slice gears 11 are inserted into one shaft 12, .

Therefore, since the slice gears 11 are fixed on both sides by the fastener 14 and the other end fastener 16 in a state of being inserted into the shaft 12, The rack 10 is completed.

On the other hand, the above-mentioned other-end fastener 16 may be formed of the same nut as that of the one-end fastener 14 described above. Here, the other end fastener 16 is connected to the lower portion of the water gate.

As described above, the rack 10 is formed with the gear teeth 13 in a dense pitch since the sliced gears 11 in the form of thin plates are overlapped and joined together. The rack 10 can be constructed by selecting the number of the sliced gears 11 and assembling them in a prefabricated manner, thereby making it possible to manufacture the slider without any length limitation. Meanwhile, the rack 10 can be applied in a general rack size.

As shown in the figure, the rack 10 is precisely controlled by the pinion which is driven by densely forming the pitch distance of the gear teeth 13, so that the rack 10 is increased in braking force.

Therefore, since the rack 10 is precisely controlled, the lifting speed of the water gate is precisely controlled, and the damper 30 provides the reaction force to the rack 10, so that the descending speed of the lifting gear is attenuated, .

The above-described embodiments are merely illustrative of preferred embodiments of the present invention, and thus the scope of application of the present invention is not limited to them, and appropriate modifications can be made within the scope of the same ideology. Therefore, the shapes and structures of the respective elements shown in the embodiments of the present invention can be modified and implemented, and it is therefore obvious that the modifications of the shapes and structures fall within the scope of the appended claims of the present invention.

10: rack 11: slice gear
30: damper 31: buffer member
33: Hydraulic Shoba 35: Flow control valve
M: drive member GB: gear box

Claims (11)

A driving member for providing driving force;
An elevator that lifts and closes the water gate by the driving force of the driving member; And
And a damper installed adjacent to the elevator to damp the descent speed of the elevator by providing a reaction force to the elevator to buffer the descending speed of the elevator,
The damper includes:
And a hydraulic shock absorber provided adjacent to the elevator and provided with a reaction force to the elevator by the pressure of the fluid filled therein while being compressed by the descent of the elevator,
In the hydraulic pressure shovel,
A plurality of rods one end of which is pressed and expanded by the elevator;
A piston connected to the other end of the rod;
An elastic body for elastically supporting the piston and returning the piston to an original position;
A hydraulic cylinder in which the elastic body and the piston are housed and the fluid is filled;
An orifice formed in the hydraulic cylinder and communicating the fluid filled in the hydraulic cylinder to the inside or outside of the hydraulic cylinder; And
And a fluid tank in which fluid communicated with the orifice is stored,
In the hydraulic pressure shovel,
And a buffer member for buffering an impact applied to the hydraulic cylinder,
The cushioning member,
A plate-shaped base mounted on a lower portion of the hydraulic cylinder; And
And an elastic plate mounted on a lower portion of the base,
Wherein the fluid tank comprises:
An inner tube installed on an upper portion of the base;
An outer tube which is formed at a larger diameter than the inner tube and is installed outside the inner tube and forms a ring-shaped tube together with the inner tube, and the fluid is filled inside; And
And a shielding plate for shielding the upper portion of the outer tube and the inner tube,
In the hydraulic cylinder,
A cylindrical inner cylinder embedded in the fluid tank; And
And a cylindrical outer cylinder provided on the outer side of the inner cylinder to provide a space in which the fluid, the elastic body and the piston are housed, on the outer side of the inner cylinder. delete delete delete delete The hydraulic shock absorber according to claim 1,
And a flow control valve installed in the orifice to control a flow rate of the orifice. The fluid control valve according to claim 6,
A bolt threadably coupled to the fluid tank; And
And a cap coupled to an end of the bolt to open and close the orifice. The fluid control valve according to claim 6,
A hollow tube coupled to the orifice and having a flow path for fluid movement;
An orifice tube made of an elastic material that has a cross-sectional area reduced due to an increase in the flow rate of the fluid in a state of being inserted into the flow path to form a variable flow path;
A cover installed on the other side of the flow path to prevent the orifice tube from being disengaged when the flow rate of the fluid increases at one side; And
And a washer disposed on one side of the orifice tube to press the orifice tube when the flow rate of the fluid increases. The method according to claim 1,
The elevator includes:
At least one rack wheel rotated by the driving member; And
And a rack, one end of which is engaged with the rack wheel, and the water gate is coupled to the other end and moved by the rack wheel to lift the water gate. 10. The rack according to claim 9,
A slice gear which is formed in a plate shape and which has a gear tooth formed on one side thereof and which is formed of a plurality of and overlapped with each other and which is in the form of a straight rod;
At least one shaft passing through the slice gears;
A one-end fastener for integrally fixing one end of the shaft to one end of the rod-shaped slice gear; And
And the other end of the shaft integrally fixed to the other end of the slice gear. 11. The apparatus according to claim 10, wherein the one-end fastener and the other-
Wherein the shaft is a nut or a nut shaft screwed to both ends of the shaft.

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