WO2014023229A1

WO2014023229A1 - Grinding power tool

Info

Publication number: WO2014023229A1
Application number: PCT/CN2013/080988
Authority: WO
Inventors: 张士松; 吴宇; 徐静涛; 钟红风
Original assignee: 苏州宝时得电动工具有限公司
Priority date: 2012-08-07
Filing date: 2013-08-07
Publication date: 2014-02-13

Abstract

A grinding power tool includes: a shell (10), a motor (11) arranged in the shell (10), a bottom plate (13) arranged below the shell (10) to connect a grinding part, a driving shaft (12) driven by the motor (10) to rotate. One end of the driving shaft (12) is connected with the motor (10), and the other end extends out of the shell (10) and eccentric rotatably connects to the bottom plate (13) so as to drive the bottom plate (13) to do regular orbital motion. The bottom plate (13) is installed with a driven shaft (15), and a transmission device (16) is arranged between the driving shaft (12) and the driven shaft (15). As the driving shaft (12) rotates, the transmission device (16) is driven to do rotating reciprocating motion and transmit the motion to the driven shaft (15). By the combined action of the driving shaft (12) and the driven shaft (15) on the bottom plate (13), the trajectory of the points on the bottom plate (13) are substantially the same, so as to improve the polishing quality and efficiency.

Description

Grinding power tools

The invention relates to a power tool, in particular to a hand-held grinding power tool.

Background technique

Sanding machine is a hand-held grinding power tool commonly used in the modern wood industry. It is mainly used for sanding paper or sand cloth mounted on the sanding machine floor for high-speed track swinging. Sand for wood, metal, glass, plastic, etc. Light work, so it is widely used in building decoration, furniture manufacturing, automotive, shipbuilding and other industries. The electric sander has the characteristics of convenient operation, safety and reliability. It saves time and effort while achieving a smooth, flat surface.

There are two types of sanders, namely, a flat swing sander (referred to as sand) and a disc track sander (abbreviated as round sand), and the motion paths of the bottom plates are different. When the round sand is working, the bottom plate rotates and rotates at the same time; while the sand is working, the bottom plate only performs the revolving motion.

An oscillating sander is disclosed, for example, in Chinese Patent Application No. CN101134295A. It includes a vertically disposed motor with an eccentric member mounted at its end, the centerline of the eccentric member being eccentrically disposed (i.e., spaced apart) relative to the axis of the motor shaft. The bottom plate is connected to the motor shaft through an eccentric member, and an elastic leg 24 is disposed between the four corners of the bottom plate and the housing. When the motor shaft rotates, the eccentric member drives the bottom plate to rotate eccentrically about the axis of the motor shaft, and at the same time, due to the traction limitation of the four elastic legs 24, the bottom plate performs regular orbital motion.

However, in the above-described oscillating sander, since the motor is vertically disposed, the bottom plate is usually set large. Since there is only one driving point between the motor shaft and the bottom plate in the middle of the bottom plate, the friction efficiency in the middle portion and the surrounding portion of the bottom plate may be different during operation, resulting in unevenness of the surface to be ground. In addition, since the motor is vertically arranged, the height of the whole machine is too large, so that the vibration generated during operation is large, and the operator's arm is easily fatigued, which affects the operation feeling.

Therefore, it is necessary to provide an improved grinding power tool to solve the above problems.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a grinding power tool that provides substantially the same motion trajectory at various points on the floor to improve grinding quality and efficiency.

In order to achieve the above object, the technical solution adopted by the present invention is as follows: A grinding power tool comprising: a housing; a motor disposed in the housing; a bottom plate disposed under the housing for connecting the grinding machine a rotating shaft; a driving shaft, which is rotated by the motor, and one end of the driving shaft The motor is mated, and the other end extends out of the housing and is eccentrically coupled to the bottom plate to cause the bottom plate to perform a regular orbital motion. A driven shaft is disposed on the bottom plate, and a transmission device is disposed between the driving shaft and the driven shaft. When the driving shaft rotates, the driven shaft reciprocates the swinging motion. .

Preferably, the transmission includes a drive shaft rotatably coupled to the housing and a transmission member fixedly coupled to the drive shaft, the drive shaft being parallel to the drive shaft.

Preferably, the driving shaft is mounted with a first eccentric member that is coupled to the bottom plate and a second eccentric member that is coupled to the transmission member, and the center lines of the first and second eccentric members are opposite to the center The axis of the drive shaft is eccentrically set.

Preferably, the two ends of the transmission member are respectively formed with a first fork portion and a second fork portion, the first fork portion is mated with the second eccentric member, and the second fork portion is The driven shaft is mated.

Preferably, the centerlines of the first and second eccentric members are symmetrically disposed with respect to an axis of the drive shaft.

Preferably, a position at which the driving shaft is mated with the bottom plate is located at a front end of the bottom plate, and at least two elastic legs are disposed between the tail end of the bottom plate and the housing.

Preferably, the movement points of the three points on the bottom plate and the two elastic legs and the driving shaft respectively are the same.

Preferably, a line connecting the three points of the two elastic legs and the driving shaft on the bottom plate forms an isosceles triangle, and the point at which the driven shaft is mated with the bottom plate is located at the two The center line of the elastic legs is connected.

Preferably, the motor is disposed laterally.

Preferably, the grinding power tool has a center of gravity as a whole, the projection of its center of gravity in the horizontal plane being within the contour of the bottom plate.

Preferably, a front portion of the motor is mounted with a motor shaft that cooperates with the drive shaft, and a rear portion of the motor is mounted with a dust suction fan.

Preferably, a dust collecting device is installed at the tail of the casing, and the dust collecting device includes a cyclone separator that is close to the dust collecting fan.

Preferably, the dust collecting device is divided into two parts, which are respectively located at two sides of the casing.

By setting the driving shaft and the driven shaft which are simultaneously connected to the bottom plate, and through the transmission, the driving shaft drives the driven shaft to rotate at the same time. The driving shaft and the driven shaft act on the bottom plate at the same time, so that the moving trajectories of the points on the bottom plate are substantially the same, thereby improving the grinding quality and efficiency.

Another object of the present invention is to provide a grinding power tool capable of transporting points on a floor The trajectories are roughly the same to improve the quality and efficiency of the grinding.

In order to achieve the above object, the technical solution adopted by the present invention is as follows: A grinding power tool comprising: a housing; a motor disposed in the housing; a bottom plate disposed under the housing for connecting the grinding machine a scraping member; and a driving shaft, which is rotated by the motor and spaced apart from the bottom plate. The bottom plate is mounted with a driven shaft, one end of the driven shaft is rotatably coupled to the housing, and the other end is eccentrically coupled to the bottom plate, the drive shaft and the driven A transmission device is disposed between the shafts, and when the driving shaft rotates, the driven shaft is rotated by the transmission device, thereby performing regular orbital motion of the bottom plate.

Preferably, the driven shaft is coupled to the housing by two bearings mounted thereon. Preferably, the two bearings are spaced apart and the transmission is coupled to the section of the driven shaft between the two bearings.

Preferably, the motor has a bottom edge located at a lowermost position in a vertical direction, and the two bearings have an upper surface located at an uppermost position in a vertical direction and a lower surface at a lowermost position, a bottom edge of the motor A vertical height to the upper surface is less than a vertical height between the upper surface and the lower surface.

Preferably, the housing is provided with a receiving cavity, and the two bearings are installed in parallel in the receiving cavity.

Preferably, two elastic legs are symmetrically disposed between the two ends of the bottom plate and the housing.

Preferably, the drive shaft is vertically disposed, and the driven shaft is parallel to the drive shaft.

Preferably, a first eccentric member is mounted on the driven shaft, and the first eccentric member is eccentrically disposed with respect to the driven shaft, so that the bottom plate can be driven to rotate eccentrically with respect to the driven shaft.

Preferably, the transmission device may be one of a belt drive, a gear drive, and a chain drive. Preferably, the motor is horizontally disposed.

By providing a driving shaft, a driven shaft and a transmission connecting the driving shaft and the driven shaft, the driving shaft is not connected to the bottom plate, but is connected to the driven shaft, so that the rotation of the driving shaft is transmitted to the driven shaft through the transmission, and Finally, the bottom plate is eccentrically rotated. The trajectories of the points on the bottom plate of the grinding power tool are substantially the same, thereby improving the quality and efficiency of the grinding.

Another object of the present invention is to provide a grinding power tool which is capable of facilitating the elimination of dust while reducing the height of the machine.

In order to achieve the above object, the technical solution adopted by the present invention is as follows: A grinding power tool, comprising: a housing; a motor disposed laterally in the housing; and a bottom plate disposed under the housing For connecting the grinding member; the driving shaft is rotated by the motor, one end of the driving shaft is coupled with the motor, and the other end extends out of the housing and is eccentrically connected to the bottom plate The bottom plate is subjected to regular orbital motion; wherein the front end of the motor has a motor shaft that is coupled to the drive shaft, and the rear end of the motor is mounted with a dust suction fan.

Preferably, a dust collecting device is installed at a tail portion of the casing, and the dust collecting device includes a cyclone separator that is close to the dust collecting fan.

Preferably, the casing tail portion is provided with an exhaust chamber, the motor has a fan shaft extending into the exhaust chamber, and the dust suction fan is housed in the exhaust chamber and mounted on the fan shaft.

Preferably, the housing is formed with a dust collecting passage, and the dust collecting device has an outlet for discharging air to the outside, and the air carrying the dust passes through the dust collecting passage, first enters the exhaust chamber, and then passes through The dust collecting device is discharged from the outlet to the outside.

Preferably, an annular elastic member is disposed between the housing and the bottom plate.

Preferably, the housing is provided with a card slot, and the central portion of the bottom plate protrudes upwardly and has an annular protrusion. The upper end of the elastic member is connected in the card slot, and the lower end of the elastic member is sleeved on the sleeve. The annular projection is on.

Preferably, the bottom plate is provided with a driven shaft, and a transmission device is disposed between the driving shaft and the driven shaft.

Preferably, when the driving shaft rotates, the transmission device is driven to perform a rotary reciprocating oscillating motion, and the transmission device transmits a rotating reciprocating oscillating motion to the driven shaft.

By setting the motor horizontally horizontally and installing the suction fan at the rear end of the motor, it is possible to reduce the height of the whole machine and facilitate the elimination of dust. The front end of the motor is matched with the driving shaft, and the rear end is connected with a dust suction fan to make the position of the dust collecting fan more reasonable, thereby shortening the length of the dust collecting passage, making the whole machine smaller in size and lower in cost.

DRAWINGS

1 is a schematic perspective view of a sander in a first embodiment of the present invention.

Figure 2 is a perspective view showing the sander housing shown in Figure 1 removed halfway.

Figure 3 is a schematic cross-sectional view of the sander of Figure 1 in a vertical direction.

4 is a schematic cross-sectional view of the sander of FIG. 1 in a horizontal direction. Figure 5 is a perspective exploded view of the sander shown in Figure 1.

Figure 6 is a perspective view of the sander shown in Figure 1 as viewed from another direction.

Figure 7 is a schematic cross-sectional view of the sander of Figure 1 taken along the dust collecting device.

Figure 8 is a perspective view of a sander in accordance with a second embodiment of the present invention.

Figure 9 is a perspective view showing the housing of the sander shown in Figure 8 removed halfway.

Figure 10 is a schematic cross-sectional view of the sander of Figure 8 in a vertical direction.

Figure 11 is a perspective view of a sander in a third embodiment of the present invention.

Figure 12 is a perspective view showing the housing of the sander shown in Figure 11 removed halfway.

Figure 13 is a schematic cross-sectional view of the sander of Figure 11 in a vertical direction.

Figure 14 is a schematic view showing the structure of a sander in a fourth embodiment of the present invention.

Figure 15 is a schematic view showing the structure of a sander in a fifth embodiment of the present invention.

Figure 16 is a schematic view showing the structure of a sander in a sixth embodiment of the present invention.

Figure 17 is a schematic view showing the structure of a sander in a seventh embodiment of the present invention.

Figure 18 is a schematic view showing the structure of a sander in an eighth embodiment of the present invention.

Figure 19 is a schematic view showing the structure of a sander according to a ninth embodiment of the present invention.

detailed description

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

Specific embodiment 1

Referring to Figures 1 and 2, a grinding power tool is specifically a low-profile flat swing sander 100. The sander 100 includes a housing 10, a motor 11 housed in the housing 10, a drive shaft 12 extending from the housing 10, a bottom plate 13 coupled to the drive shaft 12, and a housing 11 and a bottom plate 13 The elastic leg 14 is between. When the motor 11 rotates, the bottom plate 13 is eccentrically rotated by the driving shaft 12, and at the same time, under the restriction of the elastic legs 14, the bottom plate 13 finally performs regular orbital motion.

The housing 10 is generally small in size and shaped like a mouse, and can be easily held with one hand. The motor 11 is disposed laterally and housed in the housing 10. The motor 11 is laterally disposed to lower the height of the complete machine, and has a motor shaft 111 on which a first bearing 112 is mounted, which is supported by the first bearing 112 in the housing 10. Between the motor shaft 111 and the drive shaft 12, a small bevel pinion 113 and a large bevel gear 121 are provided to transmit the high speed rotation of the motor shaft 111 to the low speed rotation of the drive shaft 12.

The bottom plate 13 has a substantially triangular shape and has a bottom surface 131 on which a grinding member such as a sandpaper or an abrasive cloth is replaceably connected by a Velcro or the like. In operation, the abrading member acts on the surface of the workpiece under the driving of the bottom plate 13 for sanding treatment. The bottom plate 13 has a pointed end 132 and a trailing end 133 opposite the tip 132, the tip of which is located just on the centerline XI of the trailing end 133. The bottom plate 13 is suspended below the casing 10 by elastic legs 14. In the present embodiment, two elastic legs 14 are provided. The two resilient legs 14 are adjacent the trailing end 133 of the bottom plate 13 and are disposed symmetrically with respect to the centerline XI of the trailing end 133. In addition, the mating position of the drive shaft 12 and the bottom plate 13 is close to the top end 132 of the bottom plate 13 and is located on the center line XI of the trailing end 133. Therefore, when the sander 100 is in operation, the driving shaft 12 drives the bottom plate 13 to perform a rotary motion, but due to the limitation and dragging of the two elastic legs 14, the bottom plate 13 finally performs a regular orbital motion.

As shown in Figs. 2 and 3, the drive shaft 12 is rotatably disposed in the casing 10 through the second bearing 122 and the third bearing 123 which are disposed in parallel, and has an axis X2 substantially perpendicular to the bottom plate 13. A first eccentric member 124 is mounted at the end of the drive shaft 12, and the first eccentric member 124 has a center line X3 which is parallel to the axis X2 of the drive shaft 12. The bottom plate 13 is provided with a receiving seat 134 near the top end 132, and the first eccentric member 124 on the driving shaft 12 is received in the receiving seat 134. In the embodiment, the fourth bearing 125 is further sleeved on the outside of the first eccentric member 124. When assembled, the fourth bearing 125 is just mounted in the receiving seat 134, so that the bottom plate 13 can be eccentrically connected to the driving shaft 12.

When the motor 11 is in operation, the motor shaft 111 transmits the rotational deceleration to the drive shaft 12 by the cooperation of the bevel pinion 113 and the bevel pinion 121. When the driving shaft 12 rotates, the bottom plate 13 is eccentrically rotated about the axis X2 by the first eccentric member 124, and finally the bottom plate 13 finally outputs a regular orbital motion under the restriction of the two elastic legs 14. However, since the mating position of the driving shaft 12 and the bottom plate 13 is close to the top end 132 of the bottom plate 13, the top end 132 of the bottom plate 13 is driven by the driving force of the driving shaft 12, and the driving force of the tail end 133 is received by the elastic leg 14. The influence is small, so that the swinging amplitude of the top end 132 is larger than the swinging amplitude of the trailing end 133, and finally the grinding efficiency of the top end 132 and the trailing end 133 of the bottom plate 13 is different, so that the bottom plate 13 is not uniformly ground, which affects the workpiece to be polished. The quality of the surface is polished.

In order to ensure the grinding quality of the sander 100, a driven shaft 15 is further mounted on the bottom plate 13, and a transmission 16 is disposed between the driving shaft 12 and the driven shaft 15. When the driving shaft 12 rotates, the transmission device 16 rotates the reciprocating oscillating motion, and the transmission device 16 drives the driven shaft 15 to move. Under the joint action of the driving shaft 12 and the driven shaft 15, each point on the top end 132 and the trailing end 133 of the bottom plate 13 reaches substantially the same trajectory, so that the grinding quality of each part of the bottom plate 13 is the same, and the polished surface is improved. The quality of the grinding.

2 to 4, the driven shaft 15 is non-rotatably fixed to a substantially central position of the bottom plate 13 and disposed in parallel with the drive shaft 12. The driven shaft 15 has a columnar shape, and a fifth bearing 151 is mounted on the free end thereof. The driving shaft 12 is mounted with a second eccentric member 126 axially above the first eccentric member 124. The center line X4 of the second eccentric member 126 is parallel to the axis X2 of the driving shaft 12 and is spaced apart. A certain distance. The transmission 16 is rotatably coupled to the housing 10 and mates with the second eccentric 126. When the driving shaft 12 rotates, the second eccentric member 126 drives the transmission device 16 to rotate the reciprocating oscillating motion. The transmission 16 is simultaneously coupled to the driven shaft 15 to transmit its rotational reciprocating oscillating motion to the driven shaft 15. In the present embodiment, the driven shaft 15 and the bottom plate 13 are non-eccentrically connected. Of course, the bottom plate 13 may be eccentrically coupled to the driven shaft 15.

In this embodiment, the center line X4 of the second eccentric member 126 and the center line X3 of the first eccentric member 124 are symmetrically disposed with respect to the axis X2 of the driving shaft 12, thereby moving the points on the top end 132 and the tail end 133 of the bottom plate 13. The direction and the trajectory are substantially the same, and the eccentric moment of inertia of the first eccentric member 124 and the second eccentric member 126 can cancel each other, reducing the vibration generated by the drive shaft 12. The second eccentric member 126 is further sleeved with a sixth bearing 127, and the transmission 16 is coupled to the second eccentric member 126 by a sixth bearing.

Specifically, the transmission 16 includes a relatively fixedly coupled drive shaft 161 and transmission member 162 that is generally perpendicular to the transmission member 162. The drive shaft 161 is vertically disposed, and is provided with two seventh bearings 163 which are adjacent and arranged in parallel. The housing 10 is formed with a vertically disposed receiving cavity 101, and the transmission shaft 161 is rotatably fixed in the receiving cavity 101 by the two seventh bearings 163. By arranging the two seventh bearings 163 side by side, it is possible to prevent the transmission shaft 161 from being stressed by the end, and to improve the stability of the transmission shaft 161.

The transmission member 162 is horizontally disposed, and has a first fork portion 164 and a second fork portion 165 which are symmetrically disposed at both ends thereof. The two first fork portions 164 and the second fork portion 165 are both substantially U-shaped, wherein the first fork portion 164 is mated with the fifth bearing 151, and the second fork portion 165 is coupled with the sixth bearing 127 The first fork portion 164 and the second fork portion 165 are respectively wrapped around the fifth bearing 151 and the sixth bearing 127. When the driving shaft 12 rotates, the second eccentric member 126 drives the sixth bearing 127 to rotate eccentrically about the axis X2. By the cooperation of the second fork portion 165 and the sixth bearing 127, the transmission member 162 is rotated and reciprocated about the axis X5 of the transmission shaft 161, and the transmission member 162 is engaged by the cooperation of the first fork portion 164 and the fifth bearing 151. The oscillating motion is transmitted to the driven shaft 15.

Therefore, when the optical machine 100 is in operation, the bottom plate 13 is simultaneously driven by the eccentric drive of the drive shaft 12 and the rotary reciprocating oscillation of the transmission device 16, and is simultaneously restricted by the traction of the two elastic legs 14, so that the parts of the bottom plate 13 are The amplitude of the vibration is substantially the same, so that the quality and efficiency of the entire bottom plate 13 are improved.

As shown in FIG. 1, the housing 10 has a top end 132 and a rear end 133 corresponding to the bottom plate 13, and has opposite front ends 102 and rear ends 103. When the sander 100 is in operation, the grinding member on the bottom plate 13 acts on the surface of the workpiece to generate dust. In order to prevent dust splashing, a dust collecting device is installed at the rear end 103 of the casing 10. Set 17. A dust suction fan 18 is attached to one end of the motor 11 opposite to the motor shaft 111. The motor 11 is disposed laterally, the motor shaft 111 is disposed in the front end 102 of the casing 10, and the dust suction fan 18 is disposed in the rear end 103 of the casing 10, so that the dust is properly arranged while the overall height of the sander 100 is lowered. The position of the fan 18 makes it easy to collect dust.

As shown in Fig. 2 and Fig. 3, specifically, the rear end 103 of the casing 10 is formed with an exhaust chamber 104, and a plurality of vents 105 are formed at both sides of the exhaust chamber 104. The motor 11 has a fan shaft 114 disposed opposite the motor shaft 111. The fan shaft 114 extends into the discharge chamber 104. The suction fan 18 is mounted on the fan shaft 114 and housed in the discharge chamber 104.

The dust collecting device 17 includes a cylindrical dust collecting box 171 and a cyclone separator 172 located inside the dust collecting box 171. The dust collecting box 171 is sleeved outside the exhaust chamber 104 of the casing 10, and the elastic buckle 170 thereon can be It is detachably connected to the casing 10. The cyclone separator 172 includes a vertically disposed flow-through chamber 173, a cyclone tube 174 connected to the flow-through chamber 173, an inlet 175, and an outlet 176. The flow chamber 173 includes two front walls 177 and a rear wall 178 which are perpendicular to the motor shaft 111. The two air circulation ducts 174 are connected in parallel to the rear wall 178. The outlet 176 and the inlet 175 are respectively connected to the upper and lower sides of the front wall 178. end. There are two outlets 176, corresponding to the cyclone 174, respectively. The outlet 176 is specifically cylindrical in shape, one end extending into the flow chamber 173 and corresponding to the cyclone 174, and the other end extending into the discharge chamber 104 of the casing 10.

As shown in FIG. 6, the bottom of the bottom plate 13 is provided with a dust groove 135 which can be regularly or irregularly extended on the bottom plate 13 and extended to a partial area on the bottom plate 13, thereby being as efficient as possible. The dust generated when the bottom plate 13 is working is collected. The middle portion of the bottom plate 13, near the trailing end 133, also protrudes upwardly from the dust chamber 136. The bottom of the dust chamber 136 is in communication with the dust chute 135, and one side thereof communicates with the inlet 175 of the dust collecting device 17 through the casing 10.

As shown in Fig. 3 and Fig. 7, when the sander 100 is in operation, the motor 11 drives the dust suction fan 18 to rotate, thereby forming a negative pressure in the discharge chamber 104. The dust-carrying air enters the dust chamber 136 through the dust chute 135 of the bottom plate 13, and then enters the flow chamber 173 through the inlet 175 of the cyclone 172; enters the cyclone 174 from the flow chamber 173, and passes through the cyclone 174. The dust in the air is accumulated on the inner wall of the cyclone tube 174, and finally falls into the dust box 171; the clean air passes through the outlet 176, flows into the exhaust chamber 104, and is finally discharged through the vent 105.

In summary, by arranging the motor laterally, a driven shaft is arranged on the bottom plate, and a transmission device is arranged between the driven shaft and the driving shaft, and the transmission device is rotated and reciprocatingly oscillated, through cooperation with the driven shaft. , the rotary reciprocating oscillating motion is transmitted to the bottom plate. The above structure makes the height of the sander reduce the height of the whole machine, and ensures that the movement trajectories of the points on the bottom plate are substantially the same, thereby improving the grinding quality and playing Grinding efficiency.

Specific embodiment 2

In the first embodiment described above, the sander 100 sets the dust suction fan 18 at the tail of the motor 11, and connects the dust collecting device 17 to the rear end 103 of the casing 10, so that the lateral dimension of the whole machine is large, and the whole machine is The center of gravity is later. Therefore, when the sander 100 is placed on the workpiece, the bottom plate 13 may be placed unstable and it is easy to fall. In addition, during operation, the user needs to exert more strength to balance the whole machine, so that the user is prone to fatigue.

As shown in FIG. 8 and FIG. 9, a second embodiment of the present invention provides a low-height sander 200, which is the same as the sander 100 of the first embodiment, and includes a casing 20 and is housed in a casing. The motor 21 in the body 20, the drive shaft 22 and the bottom plate 23 connected to the drive shaft 22. The motor 21 is laterally disposed, and has a motor shaft 211 at the front end and a fan shaft 212 at the rear end, and a dust suction fan 24 is mounted on the fan shaft 212. A driven shaft 25 is mounted in the middle of the bottom plate 23, and a transmission 26 is disposed between the driven shaft 25 and the drive shaft 22.

Referring to FIG. 9 and FIG. 10 together, in the present embodiment, the dust collecting device 27 of the sander 200 is divided into two parts, symmetrically disposed on both sides of the casing 20, and each portion is provided with an outlet for discharging clean air. 271. The dust collecting device 27 uses the principle of cyclone separation, and the specific structure is basically the same as that of the first embodiment, and details are not described herein again. The difference is that the casing 20 is provided with an exhaust chamber 201 at the rear of the casing 20 and a dust collecting passage 202 near the bottom plate 23. One end of the dust collecting passage 202 is adjacent to the bottom plate 23, and the other end is connected to the exhaust chamber 201. The fan shaft 212 extends into the discharge chamber 201, and accordingly, the suction fan 24 is housed in the discharge chamber 201.

The present embodiment is different from the first embodiment in that the sander 200 has a dust collecting device 27 which is disposed side by side with the casing 20 and is located on the side of the casing 20. Since the dust collecting device 27 is not directly connected to the rear of the casing 20, but is disposed at one side of the casing 20, the lateral length of the whole machine is not increased, so that the length of the whole machine is equal to the lateral length of the casing 20. The sander 200 of this structure has a more compact structure, and the center of gravity of the whole machine is substantially in line with the center of the bottom plate 23 in the vertical direction, so that the whole machine is more stable and labor-saving during operation.

When the sander 200 is in operation, the dust-carrying air passes through the dust collecting passage 202, first enters the exhaust chamber 201, and is driven by the dust collecting fan 24 to enter the cyclone separator (not shown) of the dust collecting device 27. After the dust-carrying air passes through the dust collecting device 27, the dust in the air is separated and collected in the dust collecting device 27, and the clean air is discharged to the outside through the outlet 271 of the dust collecting device 27.

The dust collecting device 27 is disposed on the side of the casing 20, which tends to increase the overall lateral width of the sander 200, thereby causing the overall size to be too large and inconvenient to operate. In order to reduce the lateral width of the whole machine, sand The optical machine 200 is not provided with an elastic leg so that the tail portion of the casing 20 can only cover the motor 21. Therefore, the width of the casing 20 can be reduced, thereby reducing the overall width of the casing 20 and the dust collecting device 27.

In order to replace the elastic legs, in the present embodiment, an annular elastic member 28 is disposed between the casing 20 of the sander 200 and the bottom plate 23. The annular elastic member 28 is disposed perpendicular to the bottom plate 23, and the upper end is connected to the casing 20 and the lower end is connected to the bottom plate 23. When the driving shaft 22 drives the bottom plate 23 to rotate eccentrically, under the limit of the annular elastic member 28, the bottom plate 23 finally performs regular orbital motion.

As shown in FIG. 10, specifically, the housing 20 is provided with a vertically disposed slot 202, and a central portion of the bottom plate 23 protrudes upward to extend an annular protrusion 231. The annular elastic member 28 is specifically a belt and has a runway shape. The upper end of the elastic member 28 is clamped to the slot 202 of the housing 20, and the lower end is sleeved on the protrusion 231 and tightened by the fastening jaw 29. By providing the annular elastic member 28, the bottom plate 23 and the casing 20 are both pulled over the entire circumferential direction, and the oscillating motion of the bottom plate 23 is more regular and stable.

Embodiment 3

As shown in FIGS. 11 to 13, a third embodiment of the present invention discloses a low-height sander 300 including a housing 30, a motor 31 disposed in the housing 30, and a drive shaft 32 coupled to the motor 31 via a bevel gear. The driven shaft 33 driven by the driving shaft 32 and the bottom plate 34 suspended by the driven shaft 33 below the casing 30. As in the first embodiment, the motor 31 is disposed laterally, and the front end extends out of the horizontally disposed motor shaft 311. The drive shaft 32 is vertically disposed perpendicular to the motor shaft 3 11 and is meshed and driven by the bevel gear 321 and the bevel pinion 312 which are respectively mounted on the main shaft 32 and the motor shaft 31.

The difference from the first embodiment is that the drive shaft 32 is not connected to the bottom plate 34, and the bottom plate 34 is coupled to the driven shaft 33. The drive shaft 35 is provided between the drive shaft 32 and the driven shaft 33, and the drive shaft 35 transmits the rotation to the driven shaft 33. The driven shaft 33 is parallel to the drive shaft 32 and has an axis Y 1 , the top end being rotatably coupled to the housing 30 and the end being coupled to the center of the bottom plate 34. Two elastic legs 36 are symmetrically disposed between the two ends of the bottom plate 34 and the housing 30, respectively. The bottom plate 34 is eccentrically rotatably coupled to the driven shaft 33. When the driven shaft 33 rotates, the bottom plate 34 is eccentrically rotated around the axis Y1 of the driven shaft 33; since the bottom plate 34 is simultaneously pulled by the elastic legs 36 and Limiting, the bottom plate 34 ultimately forms a regular orbital motion.

Specifically, in the embodiment, the transmission device 35 is specifically a belt. A first pulley 322 is disposed at an end of the driving shaft 32, and a second pulley 331 corresponding to the first pulley 322 is disposed on the driven shaft 33. The transmission 35 is sleeved on the first pulley 322 and the second pulley 331, so that the rotation of the drive shaft 32 is transmitted to the driven shaft 33. The first eccentric member 332 is disposed on the driven shaft 33. The first eccentric member 332 is sleeved with a first bearing 333. The bottom plate 34 is specifically connected to the first bearing 333. The first eccentric member 332 is eccentrically disposed with respect to the driven shaft 33 so as to be capable of driving the bottom plate 34 to be eccentric with respect to the driven shaft 33. Turn.

By arranging the motor 31 laterally, a driven shaft 33 connected to the center of the bottom plate 34 is provided. The rotation of the drive shaft 32 is transmitted to the driven shaft 33 by the transmission device 35, and the points on the bottom plate 34 have the same motion trajectory while reducing the overall height of the sander 300, thereby achieving stable grinding efficiency.

In order to stably connect the driven shaft 33 to the casing 30, a housing chamber 301 is provided in the casing 30. Two second bearings 334 disposed in parallel are mounted on the top end of the driven shaft 33, and the two second bearings 334 are fixed in the receiving cavity 301. By providing two parallel second bearings 334, it is possible to prevent the driven shaft 33 from shaking and improve the stability of the operation of the whole machine.

Further, two second bearings 334 are horizontally disposed, a second bearing 334 located above in the vertical direction has an upper surface 335, and a second bearing located below has a lower surface 336 which is parallel to the lower surface 336. The motor 3 1 is horizontally disposed, and has a bottom edge 313 which is located at the lowermost side in the vertical direction. Wherein, in the two second bearings 334, the distance between the upper surface 335 and the lower surface 336 is D1, the distance from the bottom edge 313 of the motor 31 to the upper surface 335 of the second bearing 334 is D2, and D2 is smaller than D1. .

In the present embodiment, the sander 300 is connected to the housing 30 via the two second bearings 334, and the distance from the bottom edge 313 of the motor 31 to the second bearing 334 is less than the two second bearings. The common height of 334. While ensuring that the driven shaft 33 is stably fixed, the height of the whole machine is reduced, so that the vibration generated during the operation of the whole machine can be reduced, and the operation feeling can be improved.

DETAILED DESCRIPTION OF THE INVENTION

As shown in Fig. 14, a fourth embodiment of the present invention discloses a sander 400 having a structure similar to that of the third embodiment. The sander 400 includes a housing 40, a motor 41 housed in the housing 40 and disposed laterally, a vertically disposed drive shaft 42, a driven shaft 43 rotatably coupled to the housing 40, and an eccentrically rotatable A bottom plate 44 is attached to the driven shaft 43. The driven shaft 43 is parallel to the drive shaft 42 and its end is connected to the middle of the bottom plate 44. Between the drive shaft 42 and the driven shaft 43, a transmission 45 is provided, through which the drive shaft 42 transmits the rotation to the driven shaft 43. When the motor 41 drives the driving shaft 42 to rotate, the driven shaft 43 is rotated by the transmission 45. An elastic foot (not shown) between the bottom plate 44 and the housing 40, the driven shaft 43 has an axis Z l . The bottom plate 44, driven by the driven shaft 43, has a tendency to eccentrically rotate about the axis Z1 of the driven shaft 43, but ultimately achieves regular orbital motion under the traction and restriction of the elastic legs.

In addition to the third embodiment, the transmission 45 of the sander 400 is a gear transmission. Specifically, the transmission 45 includes a driving wheel 46 and a driven wheel 47 that meshes with the driving wheel 46. The driving wheel 46 is disposed at the end of the driving shaft 42, and the driven wheel 47 is disposed at the top end of the driven shaft 43. the Lord When the moving shaft 42 drives the driving wheel 46 to rotate, the driving wheel 46 and the driven wheel 47 are engaged to finally rotate the driven shaft 43.

DETAILED DESCRIPTION OF THE INVENTION

As shown in FIG. 15, a fifth embodiment of the present invention discloses a low-height sander 500, which is the same as the fourth embodiment. The sander 500 includes a casing 50, is housed in the casing 50, and is laterally disposed. The motor 5 1 has a vertically disposed drive shaft 52, a bottom plate 53 suspended below the housing 50, and a driven shaft 54 coupled to the bottom plate 53.

The difference is that the bottom plate 53 is eccentrically rotatably coupled to the drive shaft 52 and the driven shaft 54 at the same time. When the drive shaft 52 rotates, the bottom plate 53 performs regular orbital motion under the joint action of the drive shaft 52 and the driven shaft 54. By providing the driving shaft 52 and the driven shaft 54 which are eccentrically rotatably coupled to the bottom plate 53, the movement trajectories of the points on the bottom plate 53 are substantially the same, so that the overall quality of the bottom plate 53 is more uniform and the grinding efficiency is higher.

Specifically, the bottom plate 53 has a top end 531 and a tail end 532. The driving shaft 52 is connected to the top end 531 of the bottom plate 53. The bottom plate 531 has an axis U 1 , and the first eccentric member 521 is connected to the end. The first eccentric member 521 has a center line U2. An eccentric member 521 is peripherally sleeved with a first bearing 522, and the drive shaft 52 is coupled to the bottom plate 53 via a first bearing 522. The driven shaft 54 is coupled to the tail end 532 of the bottom plate 53 in the form of a shaft. Specifically, the first shaft 541 is located at the upper portion in the vertical direction and the second portion 542 is located at the lower portion. The first segment 541 has an axis U3. The second segment 542 has an axis U4. The first section 541 is sleeved with a second bearing 543 which is rotatably coupled to the housing 50 via a second bearing 543. The second section 542 is sleeved with a third bearing 544 that is rotatably coupled to the base plate 53 by a third bearing 544.

When the sander 500 is in operation, the motor 51 drives the driving shaft 52 to rotate, and the driving shaft 52 drives the bottom plate 53 to have an eccentric rotation about the axis U 1 through the first eccentric member 521; since the bottom plate 53 is simultaneously eccentrically disposed on the driven shaft 54 The action of the first segment 541 and the second segment 542 causes the bottom plate 53 to eventually form a regular orbital motion. Preferably, in the embodiment, the eccentricity of the first eccentric member 522 is the distance from the center line U2 of the first eccentric member 522 on the driving shaft 52 to the axis U 1 of the driving shaft 52, and the eccentric distance of the driven shaft 54 is the first The distance between the axes U3, U4 of the length 541 and the second segment 542; specifically, the eccentricity of the driven shaft 54 is slightly larger than the eccentricity of the drive shaft 52, so that the bottom plate 53 can be smoothly guided by the drive shaft 53 and the slave The moving shaft 54 is driven in common. The trajectories of the points on the bottom plate 53 are slightly different. The trajectories of the points on the top end 531 are substantially circular, and the trajectories of the points on the end 532 are substantially elliptical. This structure can also improve the overall grinding of the bottom plate 53. Quality and efficiency.

Specific Embodiment 6

As shown in FIG. 16, a sixth embodiment of the present invention discloses a low-height sander 600, and Similarly to the fifth embodiment, the sander 600 includes a housing 60, a motor 61 housed in the housing 60 and disposed laterally, a vertically disposed drive shaft 62, a driven shaft 63, and a bottom plate suspended below the housing 60. 64. The bottom plate 64 is simultaneously eccentrically coupled to the drive shaft 62 and the driven shaft 63. Specifically, the end of the driving shaft 62 is provided with a first eccentric member 621. The first eccentric member 621 is mounted with a first bearing 622. The bottom plate 64 is coupled to the driving shaft 62 via a first bearing 622. A second eccentric member 631 is disposed at the end of the driven shaft 63, and a second bearing 632 is mounted on the second eccentric member 621. The bottom plate 64 is coupled to the driven shaft 63 via the second bearing 632. The first eccentric 621 has a first eccentricity with respect to the drive shaft 62, and the second eccentric 631 has a second eccentricity with respect to the driven shaft 63. Preferably, the first eccentricity is equal to the second eccentricity.

The difference from the fifth embodiment is that a drive unit 65 is further provided between the drive shaft 62 and the driven shaft 63. When the driving shaft 62 rotates, the driven shaft 63 directly drives the driven shaft 63 to rotate, so that the bottom plate 64 can be simultaneously driven by the driving shaft 62 and the driven shaft 63, so that the points on the bottom plate 64 can be synchronously moved to the bottom plate 64. The overall movement is more stable, further improving the quality of the grinding.

In the present embodiment, the transmission device 65 specifically includes a first gear 651 and a second gear 652. The first gear 651 is mounted on the drive shaft 62, and the second gear 652 is coupled to the driven shaft 63. When the driving shaft 62 rotates, the driven shaft 63 is rotated by the engagement of the first gear 651 and the second gear 652.

Obviously, the transmission 65 is not limited to the above-described gear transmission, and may be other transmission methods such as belt transmission, chain transmission, and the like.

DETAILED DESCRIPTION OF THE INVENTION

As shown in FIG. 17, a seventh embodiment of the present invention discloses a low-height sander 700, which includes a housing 70, a motor 71 housed in the housing 70 and horizontally horizontally disposed, and a vertical A drive shaft 72 is provided and a bottom plate 73 disposed below the housing 70. The bottom plate 73 is eccentrically rotatably coupled to the drive shaft 72, and the drive shaft 72 is substantially coupled to the center of the bottom plate 73. An elastic leg 74 is disposed between the bottom plate 73 and the housing 70. The limit of the elastic legs 74 causes the bottom plate 73 to finally form a regular orbital motion. By horizontally arranging the motor 71, the height of the whole machine can be greatly reduced; at the same time, the bottom plate 73 has a geometric center, and the drive shaft 72 is connected to the geometric center of the bottom plate 73, so that the bottom plate 73 can be smoothly driven, so that the bottom plate 73 is The trajectories of the points are substantially the same, giving the entire bottom plate 73 a higher quality and efficiency of sanding.

A plurality of elastic legs 74 are disposed between the bottom plate 73 and the housing 70, and the top of the elastic legs 74 has an apex 741 located at a highest point in the vertical direction. The motor 71 has a motor shaft 711 disposed laterally, and the motor shaft 711 cooperates with the driving shaft 72 to drive the driving shaft to rotate. Motor shaft 711 has an axis 712 that is horizontally disposed. The bottom of the bottom plate 73 has a bottom surface for mounting a grinding member (not shown) 731. The vertical height between the apex 741 of the elastic leg 74 and the bottom surface 731 of the bottom plate 73 is HI, and the vertical height between the axis 712 of the motor 71 and the bottom surface 731 of the bottom plate 73 is H2, wherein H2 is smaller than HI, thereby ensuring The whole machine has a low vertical height, which reduces the vibration generated during operation and is easier to operate.

Specifically, in the present embodiment, the maximum outer diameter D of the motor 71 is 32 to 45 mm, the height HI is 36 to 50 mm, and the height H2 is 36 to 50 mm. And maintain the following ratio relationship between D, Hl, H2, where the ratio between HI and D is 0.8 1.6, the ratio between H2 and D is 0.8 1.6, and the ratio between H2 and HI is 0.7~1.6. Through the above settings, the whole machine can be made more reasonable and compact while ensuring a low height.

Embodiment 8

As shown in Fig. 18, in an eighth embodiment of the present invention, a low-height sander 800 is disclosed. Similar to the structure of the sander 700 in the seventh embodiment, the sander 800 includes a housing 80, a motor 81 housed in the housing 80 and disposed horizontally horizontally, a vertically disposed drive shaft 82, and a housing disposed in the housing 80 bottom plate 83. The bottom plate 83 is eccentrically coupled to the drive shaft 82, and the drive shaft 82 is substantially coupled to the center of the bottom plate 83. An elastic leg (not shown) is disposed between the bottom plate 83 and the housing 80, and the bottom plate 83 finally forms a regular orbital motion by the limitation of the elastic legs.

In the present embodiment, the housing 80 has a curved head 801, the drive shaft 82 is vertically disposed, and a cavity 802 is formed in the head 801 near the drive shaft 82. The sander 800 has a switch 84 and a circuit board 85 that control the operation of the entire machine, and the switch 84 is electrically connected to the circuit board 85 and the motor 81, respectively. The switch 84 is mounted on the head 801 of the housing 80, and the circuit board 85 is disposed in the cavity 802 of the housing 80 and disposed horizontally horizontally.

By arranging the switch 84 on the head 801 of the housing 80 and disposing the circuit board 85 in the cavity 802 of the housing 80, the space can be utilized to make the overall structure compact and the volume small.

DETAILED DESCRIPTION OF THE INVENTION

As shown in FIG. 19, a ninth embodiment of the present invention discloses a low-height sander 900, which is similar in structure to the third embodiment, and includes a housing 90, a motor 91 disposed in the housing 90, and a bevel gear through the motor 91. The coupled drive shaft 92, the driven shaft 93 driven by the drive shaft 92, and the bottom plate 94 suspended by the driven shaft 93 below the housing 90. The drive shaft 92 is not coupled to the base plate 94, and the base plate 94 is eccentrically coupled to the driven shaft 93. The drive shaft 95 is provided between the drive shaft 92 and the driven shaft 93, and the drive shaft 95 transmits the rotation to the driven shaft 93. The driven shaft 93 is rotatably fixedly coupled to the housing 90 via two first bearings 96 and a second bearing 97 disposed in parallel.

The difference from the third embodiment is that the first bearing 96 and the second bearing 97 are in the vertical direction Set up interval. A first pulley 921 is mounted on the end of the driving shaft 92, a second pulley 931 corresponding to the first pulley 921 is mounted on the driven shaft 93, and the second pulley 93 1 is disposed on the driven shaft 93 at the first position. On the section between the bearing 96 and the second bearing 97. The transmission device 95 is specifically a belt and is supported by the first pulley 921 and the second pulley 931.

By spacing the first bearing 96 and the second bearing 97, the driven shaft 93 is more stably connected to the casing 90, and sloshing is less likely to occur. At the same time, since the transmission 95 is coupled to the section of the driven shaft 93 between the first bearing 96 and the second bearing 97, the transmission 95 is actuated by the force on the driven shaft 93, by the first bearing 96 and The second bearing 97 is evenly distributed, further preventing the driven shaft 93 from being shaken when subjected to an external force, thereby improving the stability of the whole machine during operation and improving the use of the machine.

All of the above embodiments disclose various implementations of the sander of the present invention. In the above embodiment, different driving modes of the bottom plate are disclosed, and the purpose is to enable the points on the bottom plate to have substantially the same motion trajectory, thereby improving the grinding quality and efficiency. Further, by horizontally setting the motor horizontally, the height of the entire machine can be lowered, but the present invention is not limited thereto, and the motor can also be vertically disposed.

Further, in all of the above embodiments, the motors are all high speed motors, preferably DC high speed motors, and at the same time, the rotational speed of the motor is maintained between 15,000 and 25,000 rpm.高速Using a high-speed motor, the volume of the motor can be reduced by high speed, which reduces the volume of the entire product. At the same time, the high-speed motor drives the vacuum fan to rotate at a high speed, which improves the efficiency of vacuuming.

It should be noted that, in the above embodiments, the projection of the center of gravity of the sanding machine of the present invention in the horizontal plane falls within the contour range of the bottom plate, thereby ensuring that the whole machine is more easily balanced and convenient to operate during operation. It is not easy for the operator to feel tired.

The present invention is not limited to the embodiments in the foregoing embodiments, and other changes may be made by those skilled in the art in light of the spirit of the present invention. However, as long as the functions implemented are the same or similar to the present invention, they should be covered. Within the scope of the invention.

Claims

Claim

A grinding power tool comprising:

Housing

a motor disposed within the housing;

a bottom plate disposed under the housing for connecting the grounding member; and

a driving shaft, which is rotated by the motor, one end of the driving shaft is coupled to the motor, and the other end is eccentrically connected to the bottom plate to make the bottom plate perform a regular orbital motion;

The utility model is characterized in that: a driven shaft is arranged on the bottom plate, and a transmission device is arranged between the driving shaft and the driven shaft, and when the driving shaft rotates, the transmission device is driven to rotate and reciprocate and oscillate. The transmission transmits a rotational reciprocating oscillating motion to the driven shaft.

2. The grinding power tool according to claim 1, wherein: said transmission comprises a transmission shaft rotatably coupled to said housing and a transmission member fixedly coupled to said transmission shaft, The drive shaft is parallel to the drive shaft.

3. The grinding power tool according to claim 2, wherein: the driving shaft is mounted with a first eccentric member that is coupled to the bottom plate and a second eccentric member that is coupled to the transmission member, The centerlines of the first and second eccentric members are each eccentrically disposed with respect to the axis of the drive shaft.

The grinding power tool according to claim 3, wherein: the two ends of the transmission member are respectively formed with a first fork portion and a second fork portion, the first fork portion and the The second eccentric is mated, and the second fork is mated with the driven shaft.

5. The grinding power tool according to claim 3, wherein: the center lines of the first and second eccentric members are symmetrically disposed with respect to an axis of the drive shaft.

6. The grinding power tool according to claim 1, wherein: a position at which the driving shaft is mated with the bottom plate is located at a front end of the bottom plate, and a rear end of the bottom plate is disposed between the bottom plate and the casing. At least two elastic feet.

7. The grinding power tool according to claim 6, wherein: the three points of the bottom plate that are respectively coupled to the two elastic legs and the driving shaft have the same moving track direction.

8. The grinding power tool according to claim 6, wherein: a line connecting the three points of the bottom plate and the two elastic legs and the driving shaft respectively forms an isosceles triangle, A point at which the driven shaft is mated with the bottom plate is located on a center line of the line connecting the two elastic legs.

9. The grinding power tool according to claim 1, wherein: said motor is disposed laterally. A grinding power tool according to claim 1, wherein: a motor shaft that engages with said main shaft is attached to a front portion of said motor, and a dust suction fan is attached to a rear portion of said motor.

A grinding power tool, comprising:

Housing

a motor disposed within the housing;

a driving shaft, which is rotated by the motor and spaced apart from the bottom plate; wherein: the bottom plate is mounted with a driven shaft, and one end of the driven shaft and the housing are rotatably Connecting, the other end is eccentrically connected to the bottom plate, and a transmission device is disposed between the driving shaft and the driven shaft. When the driving shaft rotates, the driven shaft is rotated by the transmission device. And then making the bottom plate a regular orbital motion.

A grinding power tool according to claim 11, wherein: said driven shaft is coupled to said housing by two bearings mounted thereon.

The grinding power tool according to claim 11, wherein: two elastic legs are symmetrically disposed between the two ends of the bottom plate and the casing.

A grinding power tool according to claim 11, wherein: said drive shaft is vertically disposed, and said driven shaft is parallel to said drive shaft.

The grinding power tool according to claim 11, wherein: the driven shaft is mounted with a first eccentric member, and the first eccentric member is eccentrically disposed with respect to the driven shaft, thereby being capable of driving the The bottom plate is eccentrically rotated with respect to the driven shaft.