KR20090030458A

KR20090030458A - Grinder for concrete surface

Info

Publication number: KR20090030458A
Application number: KR1020070095779A
Authority: KR
Inventors: 김근식
Original assignee: 김근식
Priority date: 2007-09-20
Filing date: 2007-09-20
Publication date: 2009-03-25

Abstract

The present invention relates to a concrete floor grinding machine, the main body 10 is mounted to the carrier 3, the main body 10 is divided into the upper inner chamber 12 and the lower inner chamber 13 by the intermediate horizontal portion (11) The drive gear 23 and the driven gear 27 are mounted to the main body 10 with the motor 20 inverted and connected to the upper chamber 11 of the main body 10 by a timing belt 27. Is disposed, the rotational power of the drive gear 23 mounted on the drive shaft 21 of the motor 20 is transmitted to the driven gears 25 by the timing belt 27, and to the driven gear 25. The upper coupling portion 41 of the shaft 40 is coupled, the shaft 40 penetrates the middle horizontal portion 11 of the main body 10 to protrude into the lower inner chamber 13 of the main body 10, The nut 50 is fastened to the spiral portion 42 formed at the lower portion of the upper coupling portion 41 of the shaft 40 so that the shaft 40 is connected to the intermediate horizontal portion 11 of the main body 10 by the nut 50. Supported on the shaft 40 The shaft housing 60 inserted in the shaft housing 60 is mounted to the middle horizontal portion 11 of the main body 10 by the bolt 61, and the coupling member of the lower engaging portion 43 of the shaft 40 and the grinding wheel 70. The 71 is coupled by the pin bolt 72, the spring 80 is disposed in the groove 44 formed in the center of the lower engaging portion 43 of the shaft 40, and the grinding wheel 70 A center pin 82 mounted at the center of the coupling member 71 is disposed at the lower end of the spring 44.

Description

Concrete Floor Grinding Machine {GRINDER FOR CONCRETE SURFACE}

The present invention relates to a concrete floor grinding machine, and more particularly, the power of the drive shaft is transmitted to the three driven gears by the timing belt, and the spring disposed at the lower engaging portion of the shaft is used for the grinding wheel The present invention relates to a concrete floor grinding machine capable of absorbing vertical force due to impact and preventing transmission of vertical force (impact) to a driven gear.

"Concrete grinding machine" is introduced in Korean Patent Application No. 2006-0023610 (filed March 14, 2006).

The concrete grinder is provided with a frame that can be moved by a wheel, a grinding piece that rotates in the lower portion and the body portion is mounted to the frame, and a concrete grinding machine consisting of a handle portion mounted to be connected to one side of the frame, the body portion A motor driven by a power source; A drive shaft for transmitting rotational force of the motor; a disk-shaped rotary plate mounted to an end of the drive shaft; A drive gear fixed to a predetermined portion of the drive shaft; at least two driven gears engaged with the drive gear; A driven shaft interlocked with the driven gear and mounted in parallel with the driving shaft, one end of which is mounted through the rotating plate; And a grinding piece fastened to an end of the driven shaft to grind the concrete surface, the rotating plate being rotated by the operation of the motor, and the driven shaft being rotated along the rotating plate being rotated, and the rotation of the driven gear As the grinding piece is rotated to grind the concrete surface.

However, when the grinding piece receives the vertical force by the unevenness of the concrete ground surface, the concrete grinding machine is transferred to the gear through the driven shaft as it is, the tooth of the driven gear and the driving gear mounted on the driven shaft can be separated. In addition, since the grinding piece rotates around its driven shaft and rotates about its driven shaft by interlocking driven and drive gears, the grinding piece cannot rotate strongly around the driven shaft, so the strength of grinding the concrete floor is weak. There are disadvantages.

Accordingly, an object of the present invention is the power of the drive shaft is transmitted to the three driven gear by the timing belt, the spring disposed in the lower coupling portion of the shaft absorbs the vertical force due to the impact of the grinding wheel due to the unevenness of the concrete floor surface It is to provide a concrete floor grinding machine that can prevent the transmission of the vertical force (impact) to the driven gear, and can prevent the shaft from shaking left and right by the shaft housing.

Concrete floor grinding machine according to the present invention for achieving the above object is the main body is mounted on the carrier, the main body is divided into the upper inner chamber and the lower inner chamber by the middle horizontal portion, the motor is mounted on the body in the state inverted And a drive gear and a driven gear connected to the upper inner chamber of the main body by a timing belt, so that rotational power of the drive gear mounted on the drive shaft of the motor is transmitted to the driven gears by the timing belt, and the shaft to the driven gear. Is coupled to the upper end of the shaft, the shaft penetrates the middle horizontal portion of the main body and protrudes into the lower inner chamber of the main body, and a nut is fastened to a spiral formed at the lower side of the upper engaging part of the shaft, and the nut is connected to the middle of the main body. The shaft housing supported on the horizontal portion and fitted to the shaft is mounted to the intermediate horizontal portion of the main body by bolts, and the sharp The lower engaging portion of the grinding wheel and the engaging member of the grinding wheel is coupled by a pin bolt, the spring is disposed in the groove formed in the center of the lower engaging portion of the shaft, the center pin mounted on the center of the engaging member of the grinding wheel is Characterized in that arranged at the bottom.

Thereby, the concrete floor grinder according to the present invention can select the placement position of the driven gears relatively freely since the rotational power of the drive gear is transmitted to the driven gears by the timing belt, and the grinding is performed by the uneven portion of the concrete floor surface. When the wheel receives a vertical force, the spring is compressed by the center pin, so that the spring absorbs the vertical force, preventing the vertical force from being transmitted to the driven gear, and preventing the shaft from swinging from side to side or oscillating from side to side by the shaft housing. It can work.

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

1 to 4, the concrete floor polisher according to the present invention has a main body 10 mounted on a carrier 3, and the main body 10 is connected to the upper inner chamber 12 by an intermediate horizontal part 11. The drive gear 23 is divided into a lower inner chamber 13, and the motor 20 is mounted in the inverted state in the main body 10, and is connected to the upper inner chamber 11 of the main body 10 by a timing belt 27. ) And driven gear 27 are disposed, the rotational power of the drive gear 23 mounted on the drive shaft 21 of the motor 20 is transmitted to the driven gear 25 by the timing belt 27, The upper coupling portion 41 of the shaft 40 is coupled to the longitudinal synchronism 25, and the shaft 40 penetrates the middle horizontal portion 11 of the main body 10 so as to lower the lower chamber of the main body 10. Protruding to (13), the nut 50 is fastened to the spiral portion 42 formed in the lower portion of the upper coupling portion 41 of the shaft 40, the shaft 40 by the nut 50 is the main body ( 10 on the intermediate horizontal part 11 The shaft housing 60 fitted to the shaft 40 is mounted to the intermediate horizontal portion 11 of the main body 10 by bolts 61, and the lower coupling portion 43 and the grinding wheel of the shaft 40 are mounted. The coupling member 71 of the 70 is coupled by the pin bolt 72, the spring 80 is disposed in the groove 44 formed in the center of the lower coupling portion 43 of the shaft 40, The center pin 82 mounted at the center of the coupling member 71 of the grinding wheel 70 is disposed at the lower end of the spring 44.

The timing belt 27 is tensioned by a tensioner 29 disposed between the driven gear 25 and between the drive gear 23 and the driven gear 25.

A cover plate 55 is disposed between the driven gear 25 and the nut 50, and a bearing 57 is mounted between the cover plate 55 and the driven gear 25, thereby Rotation is not rubbed with the cover plate by the bearing 57, and a washer 59 may be disposed between the nut 50 and the intermediate horizontal portion 11 of the body 10.

The shaft housing 60 is to prevent the shaft 40 from shaking or vibrating from side to side. The bearing 62 is mounted in a hole through which the shaft 40 passes, so that rotation of the shaft 40 is not interfered with. .

The pin bolt 72 has a rod portion 72b passing through a pin hole 71a formed in the engaging member 71 of the grinding wheel 70 so that the head portion 72a is an engaging member 71 of the grinding wheel 70. ), The spiral portion 73c protrudes upward through the bolt hole 43a formed in the lower engaging portion 43 of the shaft 40 and then is fastened by the nut 74.

Concrete floor grinding machine according to the present invention configured as described above is relatively free to select the arrangement position of the driven gear 25 because the rotational power of the drive gear 23 is transmitted to the driven gear 25 by the timing belt 27 5, when the grinding wheel 70 receives the vertical force in the direction of the arrow by the uneven portion of the concrete bottom surface, the grinding wheel 70 and the coupling member 71 are pin bolts 72. The rod portion 72b of is raised. At this time, the spring 80 is disposed in the groove 44 formed in the center of the lower coupling portion 43 of the shaft 40, the spring 44 is compressed by the center pin 82, the arrow 90 The vertical force acting in the) direction is absorbed by the spring to prevent the vertical force from being transmitted to the driven gear 25. In addition, the grinding wheel 70 and the coupling member 71 are returned to their original positions by the restoring force of the spring 44. At this time, the coupling member 71 is caught by the head portion 72a of the pin bolt 72. In addition, the shaft 40 is prevented from being shaken from side to side or oscillated from side to side by the shaft housing 60.

1 is a side view showing a concrete floor grinding machine according to the present invention

Figure 2 is a partial cross-sectional view showing the main body portion of the concrete floor grinding machine according to the present invention

3 is a cross-sectional view taken along the line A-A of FIG. 2 for explaining the power transmission structure

Figure 4 is a side view showing a shaft structure for connecting the driven gear and the grinding wheel

5 is a schematic view for explaining the action of the spring when the grinding wheel is subjected to the vertical force

Claims

The main body 10 is mounted to the carrier 3, and the main body 10 is divided into an upper inner chamber 12 and a lower inner chamber 13 by an intermediate horizontal part 11, and a motor ( 20 is mounted in an inverted state, and the drive gear 23 and the driven gear 27 connected by the timing belt 27 are disposed in the upper inner chamber 11 of the main body 10, so that the motor 20 The rotational power of the drive gear 23 mounted on the drive shaft 21 is transmitted to the driven gears 25 by the timing belt 27, and the upper coupling portion 41 of the shaft 40 is connected to the driven gear 25. ) Is coupled, the shaft 40 penetrates the middle horizontal portion 11 of the main body 10 and protrudes into the lower inner chamber 13 of the main body 10, and the upper engaging portion 41 of the shaft 40. The nut 50 is fastened to the spiral portion 42 formed at the lower portion of the), and the shaft 40 is supported by the nut 50 on the intermediate horizontal portion 11 of the main body 10, and the shaft 40 The shaft housing 60 fitted in the main body 10 by bolts 61. It is mounted on the intermediate horizontal portion 11, the lower coupling portion 43 of the shaft 40 and the coupling member 71 of the grinding wheel 70 is coupled by a pin bolt 72, the shaft 40 Spring 80 is disposed in the groove 44 formed in the center of the lower engaging portion 43 of the center, the center pin 82 mounted on the center of the coupling member 71 of the grinding wheel 70 is the spring 44 Concrete floor grinding machine, characterized in that arranged at the bottom of the).

The method of claim 1,

The timing belt 27 is tensioned by a tensioner 29 disposed between the driven gear 25 and between the drive gear 23 and the driven gear 25, and the driven gear 25 and the nut ( A cover plate 55 is disposed between the plates 50, and a bearing 57 is mounted between the cover plate 55 and the driven gear 25 so that rotation of the driven gear 25 is covered by the bearing 57. Concrete floor grinding machine, characterized in that the washer 59 is disposed between the nut 50 and the intermediate horizontal portion 11 of the body 10 without friction with the plate.