Transmission structure of dust collection fan of sander

Abstract

The application discloses a transmission structure of a dust collection fan of a sander, which comprises a driving wheel and a driven wheel connected through a belt, wherein the outer diameter of the driven wheel is larger than that of the driving wheel, the upper end of the driven wheel is fixedly installed with a friction ring which is protruded outward from the periphery of the driven wheel, and the transmission wheel which is in frictional cooperation with the friction ring and has an outer diameter smaller than that of the friction ring is further included; the transmission wheel comprises a vertical central shaft, a friction sleeve which is slidably sleeved on the central shaft, a positioning pin groove which is arranged on the inner wall of the central shaft and is used for preventing rotation, and an elastic member which is installed on the central shaft and is used for pressing the friction sleeve downward. The driving mechanism and the dust collection mechanism are respectively arranged at the two ends of the polishing disc, so that the height of the polishing head is lowered, the center of gravity is more stable, the diameter of the driving wheel is smaller than that of the driven wheel, the diameter of the friction ring which is sleeved on the driven wheel is larger than that of the driven wheel, the diameter of the transmission wheel which is installed with the dust collection fan is smaller than that of the driving wheel, and under the driving of the driving motor with the same power, the driving mechanism can drive the dust collection fan to rotate more quickly.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of polishing machine, especially to a transmission structure of dust collection fan of polishing machine. BACKGROUND

[0002] In the prior art, the polishing machine with self-dust collection usually has a self-dust collection mechanism installed above the motor, for example, a wall polishing machine in CN201821347556.8 includes a housing, a switch at the handle of the housing, a motor in the housing, a gear box, an output shaft and a polishing disc, wherein the motor drives the output shaft to rotate through the gear box, the output shaft is connected with the polishing disc to make the polishing disc rotate under the drive of the motor, an elastic element is arranged between the output shaft and the polishing disc, the polishing disc moves up and down along the axis of the output shaft, and the front end of the output shaft of the motor is provided with a dust collection fan blade, which is located in the dust collection pipe below the handle.

[0003] Although the above-mentioned polishing machine can realize self-dust collection function, there are still some deficiencies in the structure, the self-dust collection mechanism is installed above the motor, which makes the center of gravity of the polishing head too high and inconvenient to operate, and the dust collection fan blade and the motor are driven through the same output shaft, so that the rotating speed of the motor and the dust collection fan blade is the same, and the rotating speed of the dust collection fan blade is relatively low, which limits the dust collection efficiency of the dust collection fan blade. SUMMARY

[0004] The present application solves the above-mentioned problems in the prior art, and provides a transmission structure of dust collection fan of polishing machine, which separates the driving motor and the dust collection fan for installation, reduces the center of gravity for easy control, and has high rotating speed of the dust collection fan and greatly improved dust collection efficiency.

[0005] The technical solution adopted by the present application to solve the technical problem is: a transmission structure of dust collection fan of polishing machine, which comprises a driving wheel driven by a motor, a driven wheel connected and driven by the driving wheel through a belt, a friction ring arranged on the upper end of the driven wheel and protruding outward from the periphery of the driven wheel, a friction sleeve in friction cooperation with the friction ring, and a central shaft installed in the friction sleeve for driving the dust collection fan to rotate, the outer wall of the friction sleeve is in the shape of a large upper and small lower cone, the inner wall is provided with a positioning pin groove for preventing rotation, and the central shaft is provided with an elastic element for pressing the friction sleeve downward. The transmission mechanism is split by friction transmission, the height of the polishing head is reduced, the center is lowered, and the balance of polishing is ensured.

[0006] In order to further improve, the transmission shaft is rotatably connected at both ends with bearings, and the driven wheel is provided with a gear box, and the bearings are fixedly installed in the gear box. The gear box can prevent sundries from entering the transmission mechanism during the operation of the machine, so as to cause the failure of the transmission mechanism.

[0007] Further improvement, the driven wheel comprises a wheel body and a fixed plate fixedly installed on the wheel body, the friction ring is sleeved outside the fixed plate, and the fixed plate is provided with an accommodating groove for accommodating the friction ring. The setting of the fixed plate and the accommodating groove can improve the service life of the grinding machine. When the friction ring is excessively worn during work, it can be replaced, and the accommodating groove can ensure that the friction ring can be stably installed in the accommodating groove.

[0008] Further improvement, the bottom of the accommodating groove is provided with a limiting surface extending outward, preventing the friction ring from falling out of the accommodating groove.

[0009] Further improvement, the driving wheel is located inside the gear box, one side of the gear box is provided with an opening for accommodating and limiting the driving wheel, and one end of the driving wheel is rotatably connected inside the gear box.

[0010] Further improvement, the outer surfaces of the driving wheel and the driven wheel are provided with uniformly distributed clamping teeth, and the inner wall of the belt sleeved on the surfaces of the driving wheel and the driven wheel is provided with clamping grooves matched with the clamping teeth. The clamping teeth arranged on the surfaces of the driving wheel and the driven wheel and the clamping grooves matched with the clamping teeth on the belt can prevent the belt from slipping during high-speed rotation of the transmission mechanism, so that the rotation transmission is not in place, thereby causing the grinding place to be not ground completely.

[0011] Further improvement, the positioning pin groove comprises a limiting piece protruding outward on the outer wall of the center shaft and a sliding limiting groove arranged on the inner wall of the friction sleeve and accommodating the limiting piece and limiting the limiting piece. The sliding limiting groove can ensure that the friction sleeve can also drive the center rod to rotate when moving downward.

[0012] Further improvement, the center shaft is provided with a limiting portion protruding from the outer surface of the center shaft, the limiting portion is located above the friction sleeve, the top of the elastic member is attached to the limiting portion, and the bottom of the elastic member is attached to the top of the friction sleeve. The elastic member is arranged between the limiting portion and the top of the friction sleeve, which can ensure that the friction sleeve can always be tightly attached to the friction ring.

[0013] Further improvement, the center shaft is arranged inside one side of the gear box, the bottom end of the center shaft is rotatably connected to the bottom of the gear box, and the top of the center shaft is rotatably connected to the top end of the gear box and protrudes from the surface of the gear box. Arranging the center shaft inside the gear box can prevent dust from entering the gear box when the dust fan is sucking dust.

[0014] Further improvement, a sander further comprises a driving motor driving the driving wheel to rotate, a circular cover plate for installing the driven wheel, a polishing disc rotating through the transmission wheel driven by the driving wheel and a dust collection fan installed on the central shaft, the gear box is floatingly installed on the circular cover plate, the circular cover plate is provided with a floating adjusting hole for installing the gear box, the outer surface of the gear box is provided with a fixed part extending outward, the inner side of the fixed part is provided with a sliding hole, a guide column is slidingly connected in the sliding hole and installed on the circular cover plate, the outer side of the guide column is provided with an elastic member pushing the fixed part upward, the guide column is provided with a limiting part limiting the fixed part, the circular cover plate is provided with a sealing cover outside the dust collection fan, the sealing cover and the circular cover plate are provided with a dust collection channel communicating with each other, the sealing cover is provided with a delivery port discharging dust from the sealing cover, and the delivery port is connected with a conveying pipeline. The circular cover plate is provided with a sealing cover outside the dust collection fan, the sealing cover and the circular cover plate are provided with a dust collection channel communicating with each other, the sealing cover is provided with a delivery port discharging dust from the sealing cover, and the delivery port is connected with a conveying pipeline. The inlet, the outlet and the conveying pipeline can well absorb the dust generated after polishing, and the working efficiency can be improved without cleaning after polishing.

[0015] The beneficial effects of the present application are: the dust collection mechanism places the driving mechanism at both ends of the polishing disc, which reduces the height of the polishing head, makes the center of gravity more stable, facilitates the operation of the user, and facilitates the user to polish the object more uniformly. The diameter of the driving wheel is smaller than that of the driven wheel, the diameter of the friction ring on the driven wheel is larger than that of the driven wheel, and the small transmission wheel is driven to rotate through the friction ring, thereby improving the rotation speed of the transmission wheel. Under the driving of the driving motor with the same power, the driving mechanism can drive the dust collection fan to rotate faster. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The structure of the present application is shown in the figure;

[0017] Figure 2 The structure of the sander is shown in the figure;

[0018] Figure 3 The structure of the driven wheel is shown in the figure;

[0019] Figure 4 The structure of the transmission mechanism is shown in the figure;

[0020] Figure 5 The structure of the dust collection fan and its sealing cover is shown in the figure;

[0021] Figure 6 The structure of the transmission wheel is shown in the figure;

[0022] Figure 7 The sectional view of the fixed part is shown in the figure.

[0023] Explanation of signs: driving wheel 1, driven wheel 2, belt 3, friction ring 4, transmission wheel 5, central shaft 6, friction sleeve 7, positioning pin slot 8, elastic member 9, gear box 10, transmission shaft 11, fixed plate 12, wheel body 13, containing groove 14, driving motor 15, clamping tooth 16, clamping groove 17, limiting sheet 18, sliding limiting slot 19, limiting part 20, dust collection fan 21, sealing cover 22, circular cover disc 23, feeding inlet 24, feeding outlet 25, conveying pipeline 26, fixed part 27, floating adjusting hole 28, sliding hole 29, guide column 30, spring 31, limiting member 32. DETAILED DESCRIPTION

[0024] The application will be further described below in conjunction with the drawings and specific embodiments. Those skilled in the art will be able to implement the application based on these descriptions. In addition, the embodiments of the application involved in the following description are generally only a part of the embodiments of the application, not all the embodiments. Therefore, based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor should be within the scope of protection of the application.

[0025] Reference is made to the drawings Figure 1 In this embodiment, a transmission structure of a dust collection fan of a sander is disclosed, which comprises a driving wheel 1 and a driven wheel 2 connected by a belt 3, the outer diameter of the driven wheel 2 is greater than that of the driving wheel 1, and a friction ring 4 protruding outward from the periphery of the driven wheel 2 is fixedly installed on the upper end of the driven wheel 2. The transmission structure further comprises a transmission wheel 5 in frictional cooperation with the friction ring 4, and the outer diameter of the transmission wheel 5 is smaller than that of the friction ring 4. The friction ring 4 is made of a material with flexibility, such as rubber or the like.

[0026] Reference is made to the drawings Figure 1 , 2, 3: Wherein the transmission shaft 11 both ends are rotatably connected with bearing, the driven wheel 2 is provided with gear box 10, the bearing is fixedly installed in the gear box 10, the gear box 10 includes the upper cover located on the outer side of the upper end of driven wheel 2 and the lower cover located on the outer side of the lower end of driven wheel 2, the driven wheel 2 center is installed with transmission shaft 11, the upper end of transmission shaft 11 is rotatably connected in the upper cover, the lower end of transmission shaft 11 is rotatably connected in the lower cover, the upper cover and the lower cover are fixed by bolt, the driven wheel 2 center is provided with through hole, the through hole is installed with transmission shaft 11, the upper end of transmission shaft 11 is connected with bearing, the bearing is rotatably connected on the gear box 10, the driven wheel includes the inner ring arranged in hollow, the outer ring located on the outer side of the inner ring and the fixing rib connected between the outer ring and the inner ring, preferably, three fixing ribs are arranged in the embodiment, the fixing rib is provided with threaded hole, the inner ring of fixing plate 12 is provided with opening hole matched with the threaded hole for fixing, the fixing plate 12 is fixed on the upper end of driven wheel 2 by the fixing mode of screwing bolt into threaded hole, the friction ring 4 is detachably installed on the fixing plate 12, the outer periphery of fixing plate 12 is provided with containing recess 14 containing friction ring 4, the bottom of containing recess 14 is provided with outwardly extending limiting surface, preventing friction ring 4 from falling off from containing recess 14.

[0027] Reference is made to the accompanying drawings Figure 1 , 4 : Since the driving ability of the driving wheel 1 and the driven wheel 2 itself does not have, the driving motor 15 is connected on the driving wheel 1, the driving wheel 1 is fixedly installed on the output shaft of the driving motor 15, wherein the driving wheel 1 is located inside the gear box 10, the bottom end of one side of the gear box 10 is provided with opening hole containing and limiting the driving wheel 1, the side of the driving wheel 1 close to the bottom end of the gear box 10 is provided with limiting plate protruding to the periphery, preventing the belt 3 installed on the driving wheel 1 from falling off from the driving wheel 1, in order to prevent the belt 3 installed on the driving wheel 1 and the driven wheel 2 from slipping when the sander works at high speed, the driving wheel 1 and the driven wheel 2 are provided with evenly distributed clamping teeth 16, the belt 3 is provided with clamping groove 17 matched with the clamping teeth 16, the number and size of the clamping teeth 16 and the clamping groove 17 are matched.

[0028] Reference is made to the accompanying drawings Figure 1 , 6: Wherein, the transmission wheel 5 comprises a vertical installed center shaft 6, the center shaft 6 is installed inside the gear box 10, the bottom of the center shaft 6 is installed with a bearing, the bearing is rotatably connected on the gear box 10, the transmission wheel 5 further comprises a friction sleeve 7 which is slidably sleeved on the center shaft 6, the inner wall of the friction sleeve 7 is provided with anti-rotation positioning pin grooves 8 with the center shaft 6, the positioning pin grooves 8 are divided into limiting pieces 18 which are arranged on the center shaft 6 and protrude from the outer surface of the center shaft 6, the inner wall of the friction sleeve 7 is provided with sliding limiting grooves 19 which accommodate the limiting pieces 18 and cooperate with the limiting pieces 18 to limit, because the transmission wheel 5 and the driven wheel 2 are in contact with each other and are transmitted by friction, after a long time of transmission, the friction ring 4 and the surface of the friction sleeve 7 will be worn to a certain extent, so that the volume of the two is reduced, in order to ensure that the two can always be closely fitted, the friction sleeve 7 is designed as a conical shape which is large at the top and small at the bottom and can move up and down relative to the center shaft 6, at the beginning, the friction ring 4 is fitted with the bottom end of the friction sleeve 7, during the continuous working process, the friction sleeve 7 will gradually move down, because the position of the limiting pieces 18 is always kept unchanged, in order to ensure that the friction sleeve 7 can also drive the center shaft 6 to rotate after moving down through the sliding limiting grooves 19, the sliding limiting grooves 19 are designed in a through state from top to bottom, in order to ensure that the friction sleeve 7 can always be closely fitted with the friction ring 4, the elastic member 9 which can press the friction sleeve 7 downward is arranged above the center shaft 6, the elastic member 9 can be a compression spring which is arranged above the friction sleeve 7 in a squeezed and contracted state, in order to ensure that the elastic member 9 can always press the friction sleeve 7 downward, the limiting portion 20 which protrudes from the outer edge surface of the center shaft 6 and surrounds the outer surface of the center shaft 6 is arranged on the center shaft 6, the limiting portion 20 is located above the friction sleeve 7, the top of the elastic member 9 is fitted with the limiting portion 20, the top of the elastic member 9 is fitted with the top of the friction sleeve 7, the length of the elastic member 9 in the relaxed state should be longer than the length between the top of the friction sleeve 7 and the limiting portion 20 when the top of the friction sleeve 7 is fitted with the friction ring 4.

[0029] Reference is made to the accompanying drawings Figure 5 : In the embodiment, a grinding machine provided with the transmission device is also disclosed, wherein the grinding machine further comprises a dust collection fan 21 which is installed on the transmission wheel 5, the top of the center shaft 6 is movably installed on the gear box 10 and protrudes from the top of the gear box 10, the dust collection fan 21 is installed on the top of the center shaft 6 which protrudes from the gear box 10, the dust collection fan 21 can generate suction force in the rotating state, the dust collection fan 21 is sleeved with a sealing cover 22, the sealing cover 22 is connected with a circular cover disc 23, reference is made to the accompanying drawings Figure 7Gear box 10 is floatingly mounted on the circular cover disc 23, the circular cover disc 23 is provided with floating adjustment holes 28 for mounting the gear box 10, the outer surface of the gear box 10 is provided with an outwardly extending fixing part 27, the inner side of the fixing part 27 is provided with a sliding hole 29, the sliding hole 29 is slidingly connected with a guide column 30 mounted on the circular cover disc 23, the outer side of the guide column 30 is provided with a spring 31 for pushing the fixing part 27 upward, the guide column 30 is provided with a limiting piece 32 for limiting the fixing part 27, the sealing cover 22 is provided with a dust inlet 24 for sending the dust generated after polishing the polishing disc into the sealing cover 22, the top end of the sealing cover 22 is provided with a dust outlet 25 for sending the dust away from the sealing cover 22, the dust outlet 25 is connected with a conveying pipeline 26, the conveying pipeline 26 is connected with a dust collecting box for temporarily storing the dust, wherein the driving motor 15, the driven wheel 2, the dust collecting fan 21 and the conveying pipeline 26 are located on a straight line, and the driving motor 15, the driven wheel 2 and the dust collecting fan 21 are mounted on the circular cover disc 23, the driven wheel 2 is located at the middle position of the circular cover disc 23, the polishing disc is mounted in the circular cover disc 23, the lower end of the transmission shaft 11 is rotatably connected with the gear box 10 and protrudes from the surface of the gear box 10, the circular polishing disc is mounted at the bottom of the transmission shaft 11 protruding from the gear box 10, since the transmission shaft 11 mounted on the driven wheel 2 is located at the center position of the circular polishing disc, the circular polishing disc can be directly driven to rotate and polish by the transmission shaft 11, specifically, the lower end of the transmission shaft 11 is connected with the circular polishing disc after penetrating through the transmission wheel 5 mounting shell and the cover disc, further, in order to facilitate the replacement of the circular polishing disc, the circular polishing disc can be mounted at the lower end of the transmission shaft 11 in a detachable manner.

[0030] The description and the claims herein use certain terms to refer to certain features that shall be presented. Those of ordinary skill in the art will recognize that manufacturers can refer to a component by different names. This document does not intend to distinguish between components that differ in name but not in function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted as "including, but not limited to."

[0031] The above is the preferred embodiment of the present application, it should be pointed out that, for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements also considered as the protection scope of the present application.

Claims

1. A transmission structure of a dust collection fan of a sander, comprising a driving wheel (1) driven by a motor, and a driven wheel (2) connected and driven by a belt (3) with the driving wheel (1), characterized in that: The friction ring (4) is arranged on the upper end of the driven wheel (2) and protrudes outward from the periphery of the driven wheel (2), the friction sleeve (7) is in frictional cooperation with the friction ring (4), and the central shaft (6) is slidably arranged in the friction sleeve (7) and used for driving the dust collection fan (21) to rotate, the transmission shaft (11) for mounting the polishing disc is arranged at the center of the driven wheel (2), the outer wall of the friction sleeve (7) is in a conical shape with the upper part being larger and the lower part being smaller, the inner wall of the friction sleeve (7) is provided with the positioning device (8) for preventing rotation of the central shaft (6), the elastic member (9) is arranged on the central shaft (6) and used for pressing the friction sleeve (7) downward, the driven wheel (2) comprises a wheel body (13) and a fixed plate (12) fixedly arranged on the wheel body (13), the friction ring (4) is sleeved on the outer side of the fixed plate (12), the outer side of the fixed plate (12) is provided with the containing groove (14) for containing the friction ring (4), and the bottom of the containing groove (14) is provided with the limiting surface extending outward.

2. A transmission structure of a dust collection fan of a sander according to claim 1, characterized in that: Both ends of the transmission shaft (11) are rotatably connected with bearings, and the gear box (10) is arranged outside the driven wheel (2).

3. A dust extraction fan drive for a sander as claimed in claim 2, wherein: The driving wheel (1) is located inside the gear box (10), and both ends of the driving wheel (1) are rotatably connected to the gear box (10).

4. The transmission structure of a dust collection fan of a sander according to claim 1, wherein: The driving wheel (1) and the driven wheel (2) are provided with uniformly distributed clamping teeth (16) on the outer surfaces thereof, and the inner wall of the belt (3) sleeved on the surfaces of the driving wheel (1) and the driven wheel (2) is provided with clamping grooves (17) matched with the clamping teeth (16).

5. The transmission structure of a dust collection fan of a sander according to claim 1, wherein: The positioning device (8) comprises the limiting piece (18) arranged on the outer wall of the central shaft (6) and protruding outward, and the sliding limiting groove (19) arranged on the inner wall of the friction sleeve (7) and used for containing and limiting the limiting piece (18).

6. A dust extraction fan drive for a sander as claimed in claim 1, wherein: The limiting portion (20) protruding from the outer surface of the central shaft (6) is arranged on the central shaft (6), the limiting portion (20) is located above the friction sleeve (7), the top of the elastic member (9) is attached to the limiting portion (20), and the bottom of the elastic member (9) is attached to the top of the friction sleeve (7).

7. The transmission structure of a dust collection fan of a sander according to claim 2, wherein: The central shaft (6) is arranged on one side inside the gear box (10), and both ends of the central shaft (6) are rotatably connected to the bottom of the gear box (10).

8. A grinding machine comprising the transmission structure of any one of claims 2, 3 or 7, further comprising a driving motor (15) driving the driving wheel (1) to rotate, a circular cover plate (23) for mounting the driven wheel (2), a grinding disc mounted in the circular cover plate (23) and driven to rotate by the driven wheel (2), and a dust suction fan (21) mounted on the central shaft (6), wherein the gear box (10) is floatingly mounted on the circular cover plate (23), the circular cover plate (23) is provided with a floating adjusting hole (28) for mounting the gear box (10), the outer surface of the gear box (10) is provided with a fixed part (27) extending outward, the inner side of the fixed part (27) is provided with a sliding hole (29), a guide column (30) mounted on the circular cover plate (23) is slidingly connected in the sliding hole (29), the outer side of the guide column (30) is provided with a spring (31) pushing the fixed part (27) upward, a limiting piece (32) limiting the fixed part (27) is mounted on the guide column (30), a sealing cover (22) outside the dust suction fan (21) is mounted on the circular cover plate (23), a dust suction channel is arranged between the sealing cover (22) and the circular cover plate (23), a delivery outlet (25) for discharging dust from the sealing cover (22) is arranged on the sealing cover (22), and a conveying pipeline (26) is connected to the outer side of the delivery outlet (25).

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