CN215510429U - Grinding disc stabilizing structure of orbital motion grinding machine - Google Patents

Abstract

A stable structure of grinding disc for track motion grinder is composed of a casing, a grinding power source, a grinding disc and at least four springs. The grinding power source is assembled on the shell and is provided with a driving shaft and a tool holding piece which is arranged on the driving shaft and deviates from the axis of the driving shaft, the center of the grinding disc is arranged on the tool holding piece by a locking screw, and the grinding disc is driven by the grinding power source to carry out orbital motion. The two ends of the springs are respectively arranged on the shell and the grinding disc, one free length of each spring is larger than a distance between one spring mounting part provided by the shell and the same spring mounting part provided by the grinding disc, each spring is not completely compressed due to the distance, and the springs are stretched to maintain the stability of the grinding disc in the process of the orbital motion of the grinding disc.

Description

Grinding disc stabilizing structure of orbital motion grinding machine

Technical Field

The present invention relates to a stable structure of a grinding plate of an orbital grinder, and more particularly, to a stable structure of a grinding plate capable of solving the problem of an edge of a grinding plate being lifted up by mistake when a conventional orbital grinder rotates.

Background

The grinding machine tool moves in the following manner: rotational Motion (Rotational Motion), Reciprocating Motion (Reciprocating Motion), Orbital Motion (Orbital Motion), and Random Orbital Motion (Random Orbital Motion). Among them, a grinding machine tool that grinds a workpiece to be ground in an Orbital motion is called an Orbital grinder (Orbital Sander). The basic structure of the orbital motion grinder is as follows: the orbital motion grinder is provided with a power motor in a casing, a spindle of the power motor is connected with an eccentric device to form an eccentric shaft together, and the eccentric shaft drives a grinding disc to move through a Bearing (Bearing).

When the eccentric shaft of the orbital motion grinder drives the grinding disc to perform eccentric orbital motion, the grinding disc is affected by rotational Inertia (also called Inertia Moment) to generate vibration like tail flicking (Drifting), which causes the grinding disc to grind in an unstable orbital motion, thereby affecting the final grinding effect.

The method for solving the problems comprises the following steps: a hanging bracket (Pad Support) is arranged between the machine shell and the grinding disc, and the hanging bracket limits the vibration of the rotational inertia to the grinding disc, so that the grinding disc keeps in the range of the swing Diameter (Pendulum Diameter) to carry out stable orbital motion. There are two embodiments of the prior art hanger, one is a fence type hanger (40 as shown in fig. 1) and the other is a cylinder type hanger (50 as shown in fig. 2). The former finger boom hangers are disclosed in patents US6979254, EP2815843, JP2016030303A, JP 2013220493A. Cylindrical hangers are disclosed in patents JP2004066420A, JP3694342B2, CN205184482U, CN105983893A, CN105922106A and GB 2104422A.

When the orbital motion grinder works, the eccentric displacement is about ten thousand to two thousand times per minute, and the eccentric displacement can reach dozens of thousand times per hour under the continuous work, and about fifteen million times per day. It means that the hanger will be pulled continuously when the orbital grinding machine works, and when the orbital grinding machine is assembled on the mechanical arm to work all day long, the number of times that the hanger is pulled per day will reach ten million, which is a great test for the life of the hanger.

The hanger of the two embodiments has a characteristic of being bendable, but the hanger itself does not have a tensile characteristic, that is, the length of the hanger cannot be lengthened by an external force. When the orbital motion grinder works, the grinding disc is driven by the eccentric shaft to generate eccentric displacement, and the part of the hanging bracket arranged on the grinding disc deviates from the part of the hanging bracket arranged on the shell, so that the direct distance between the part of the hanging bracket arranged on the grinding disc and the part of the hanging bracket arranged on the shell is prolonged. The reason why the direct distance is longer can be described as a right triangle, when the orbital motion grinder is not in operation, the hanger is in the same state as the opposite side of the right triangle (41 in fig. 3), when the orbital motion grinder is in operation, the offset generated by the hanger at the location where the hanger is disposed on the grinding disc is the adjacent side of the right triangle (42 in fig. 3), at this time, the distance between the location where the hanger is disposed on the grinding disc and the location where the hanger is disposed on the housing is the oblique side of the right triangle (43 in fig. 3), as can be directly understood from the basic concept of the right triangle, the oblique side 43 of the right triangle is larger than the opposite side 41, which is indicated in this paragraph. However, since the hanger does not have a stretching characteristic, the hanger cannot cope with the problem of the direct distance lengthening, which causes the problem of the edge region of the polishing disc being lifted up by mistake (as indicated by 60 in fig. 3), so that the polishing disc loses the accurate flatness, and the polishing quality is affected.

Furthermore, due to the characteristic that the conventional hanger cannot be stretched, the eccentric displacement distance of the grinding disc of the orbital grinder is limited, and the grinding disc cannot be implemented with a large eccentric distance.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to solve the problem that the edge of a grinding disc is lifted by mistake when the grinding disc rotates due to the additional installation of a hanging bracket of an orbital motion grinding machine.

To achieve the above objective, the present invention provides a stable structure of a grinding plate of an orbital grinder, which comprises a housing, a grinding power source, a grinding plate and at least four springs. The grinding power source is assembled on the casing and is provided with a driving shaft and a tool holding piece which is arranged on the driving shaft and deviates from the axis of the driving shaft. The center of the grinding disc is arranged on the tool holder by a locking screw, and the grinding disc is driven by the grinding power source to perform an orbital motion relative to the casing. Each spring is provided with a first end arranged on the shell and a second end arranged on the grinding disc, the free length of each spring is larger than the distance between the first end mounting part provided by the shell and the second end mounting part provided by the grinding disc, each spring is not completely compressed due to the distance, and when the second end of each spring deviates from the projection position of the first end in the process of the orbital motion of the grinding disc, the springs are stretched.

In one embodiment, the housing is provided with a first mounting cavity at a position where each spring is provided.

In one embodiment, the housing has a plurality of first rubber sleeves respectively disposed in the first mounting holes and provided with the first ends disposed therein.

In one embodiment, each first rubber sleeve has a first cap body placed in the first mounting cavity, and a first wing extending from the periphery of the first cap body and disposed at the edge of the opening of the first mounting cavity.

In one embodiment, the portion of the polishing disc provided with each of the second ends is provided with a second mounting cavity.

In one embodiment, the polishing disc includes a base disc and a polishing pad disposed on the base disc, and the base disc is formed with a plurality of second mounting cavities on a side facing the housing.

In one embodiment, the polishing disk has a plurality of second rubber sleeves respectively arranged in the second mounting holes and provided with the second ends arranged therein.

In one embodiment, each second rubber sleeve has a second cap body placed in the second mounting cavity, and a second wing extending from the periphery of the second cap body and disposed at the edge of the opening of the second mounting cavity.

In one embodiment, each of the springs has a first set of connectors disposed at the first end and fixed to the housing through a first assembly member.

In one embodiment, each of the springs has a second set of contacts disposed at the second end and providing a second assembly member disposed therein.

In one embodiment, the housing includes a rectangular dust cover facing the polishing disc, and the springs are located at corners of the rectangular dust cover.

In one embodiment, the portion of the casing where the first end of each spring is disposed is a first boss.

In one embodiment, the portion of the polishing disc provided at the second end of each spring is a second convex pillar.

In one embodiment, the polishing disk is rectangular.

Through the implementation of the utility model, compared with the prior art, the utility model has the following characteristics: the utility model replaces the design of the conventional hanging bracket with the springs, and the free length of each spring is larger than the distance between the first end mounting part provided by the shell and the second end mounting part provided by the grinding disc. When the second end of each spring deviates from the projection position of the first end in the process of the orbital motion of the grinding disc, the springs are stretched, and the deformation of each spring is used for complementing the change of the distance between the first end and the second end, so that the grinding disc can be kept stable.

Drawings

FIG. 1 is a schematic view of a conventional orbital grinding machine implemented as a boom hanger;

FIG. 2 is a schematic view of a conventional orbital grinding machine implemented as a cylindrical hanger;

FIG. 3 is a schematic view showing an embodiment of a conventional orbital grinder in which the edge region of the grinding disk is erroneously lifted;

FIG. 4 is a schematic sectional view showing the structure of an orbital grinder according to a first embodiment of the utility model;

FIG. 5 is a schematic structural view of a stabilization structure of an abrasive disk according to a first embodiment of the present invention;

FIG. 6 is a schematic view illustrating an embodiment of a stabilizing structure of a polishing pad according to a first embodiment of the present invention;

FIG. 7 is a schematic view showing the displacement of the second end of the spring in the stabilizing structure of the polishing pad according to the first embodiment of the present invention;

FIG. 8 is a schematic structural view of a second embodiment of a stabilizing structure for an abrasive disk according to the present invention;

FIG. 9 is a schematic structural view of a stabilization structure of a polishing pad according to a third embodiment of the present invention;

FIG. 10 is a schematic structural view of a stabilization structure of a polishing pad according to a third embodiment of the present invention;

fig. 11 is a partial structural view of the orbital motion grinder according to the first embodiment of the present invention.

[ notation ] to show

10: orbital motion grinder

11: casing (CN)

111: first mounting hole

112: first rubber sleeve

113: first cap body

114: first wing

115: first convex column

116: rectangular dust cover

12: grinding power source

121: motor with a stator having a stator core

122: drive shaft

123: tool holder

124: axle center of driving shaft

125: tool holder axis

126: motion trail

13: grinding disc

131: locking screw

132: second mounting pocket

133: foundation plate

134: polishing pad

135: second rubber sleeve

136: second cap body

137: second wing

138: second convex column

14: spring

141: first end

142: second end

143: free length

144: first group of joints

145: second group of joints

15: distance between each other

161: first assembly member

162: second assembly member

20: original position of the second end

21: second end displaced to the rear position

40: hanging bracket

41: opposite side

42: adjacent edge

43: bevel edge

50: hanging bracket

60: edge lift scheme

Detailed Description

The present invention is described in detail and technical content with reference to the accompanying drawings, wherein:

referring to fig. 4 and 5, the present invention provides a grinding plate stabilizing structure of an orbital grinder 10, wherein the orbital grinder 10 is a machine tool that is provided to be operated by a user in a hand. The grinding disc stabilizing structure comprises a casing 11, a grinding power source 12, a grinding disc 13 and at least four springs 14, wherein the casing 11 is designed to be held by a user, and the casing 11 is provided with the grinding power source 12. The grinding power source 12 includes a motor 121, a driving shaft 122 and a tool holder 123, and the motor 121 may be a pneumatic motor or an electric motor according to implementation requirements, and is not limited to the illustration. The drive shaft 122 may actually be implemented as a spindle of the motor 121, i.e. it is shown that in one embodiment a rotor of the motor 121 is arranged on the drive shaft 122. The tool holder 123 is provided on the drive shaft 122, and the center of the tool holder 123 is offset from the axial center of the drive shaft 122. In addition, the center of the grinding disc 13 is disposed on the tool holder 123 by a locking screw 131, and the grinding disc 13 is driven by the grinding power source 12 to perform an Orbital Motion (Orbital Motion) relative to the housing 11. Further, the abrasive disk 13 is rectangular.

Accordingly, each spring 14 has a first end 141 disposed on the housing 11 and a second end 142 disposed on the polishing disc 13. The utility model provides that a free length 143 of each spring 14 is greater than a distance 15 between the mounting portion of the housing 11 at the first end 141 and the mounting portion of the grinding plate 13 at the second end 142. When each of the springs 14 of the present invention is assembled, each of the springs 14 will be pre-compressed due to the free length 143 being greater than the gap 15, but it should be noted that each of the springs 14 of the present invention is not fully compressed by the gap 15 and therefore each of the springs 14 of the present invention must not be an extension spring.

Referring to fig. 5 and 7, how the stable structure of the polishing disc 13 can maintain the polishing disc flat and stable when the orbital grinder 10 is started will be described later. First, fig. 7 is a schematic based on a bottom view or a top view of the orbital grinder 10. In fig. 7, reference numeral 124 is the axial center of the driving shaft 122, reference numeral 125 is the axial center of the tool holder 123, reference numeral 126 is the movement locus of the axial center of the tool holder 123 driven by the driving shaft 122, reference numeral 20 is the original position of the second end 142 of each spring 14, and reference numeral 21 is the position of the second end 142 of each spring 14 displaced with the polishing disc 13. When the orbital grinder 10 is started, the grinding power source 12 drives the grinding disc 13 to generate the orbital motion for grinding. In the orbital motion of the polishing disc 13, the second end 142 of each spring 14 on the polishing disc 13 is shifted relative to the first end 141 of the same spring 14 along with the movement of the polishing disc 13 (as indicated by 20 and 21 in fig. 7), and when the second end 142 is shifted from the projected position of the first end 141, the distance between the first end 141 and the second end 142 of each spring 14 is longer than the distance 15. At this time, the springs 14 are stretched. It should also be understood that the described extension of the present invention is based on a comparison of the springs 14 when the grinding disk 13 is not in operation. The variation of the state of each spring 14 just compensates the variation of the distance between the first end 141 and the second end 142, so that the grinding disc 13 can be kept stable, and the problem of unstable operation of the grinding disc 13 extended by a conventional assembly hanger is solved. In addition, the utility model solves the problem of poor service life of the conventional hanging bracket through the design.

Referring to fig. 5 and 6 again, the housing 11 may be provided with a first mounting hole 111 at a portion where each first end 141 is provided, an opening of the first mounting hole 111 faces the polishing disc 13, and the first mounting hole 111 is implemented as a circular hole having a diameter corresponding to a diameter of each first end 141 of the springs 14. Also, each of the first mounting cavities 111 may have a suitable depth to increase the stability of each of the springs 14 after being mounted, and it should be noted that each of the springs 14 is disposed in one of the first mounting cavities 111 to such an extent that the normal operation of each of the springs 14 is not affected. To avoid the problem of the springs 14 falling off by mistake when the orbital grinder 10 is started, in one embodiment, the housing 11 further has a plurality of first rubber sleeves 112 respectively disposed in the first mounting holes 111. Each of the first rubber sleeves 112 is implemented by a solid rubber body capable of being deformed properly, such as rubber. The first rubber sleeves 112 make the first ends 141 of the springs 14 obtain a larger restraining force, and are stably disposed in the first mounting holes 111. In addition, each first rubber sleeve 112 may have a first cap body 113 disposed in the first mounting cavity 111, and a first wing 114 extending from the periphery of the first cap body 113 and disposed at the opening edge of the first mounting cavity 111.

Referring to fig. 5 and 6, the portion of the polishing disc 13 provided at the second end 142 of each spring 14 is provided with a second mounting cavity 132, and the design concept of the second mounting cavity 132 is the same as that of the first mounting cavity 111, which is not repeated herein. The polishing disc 13 includes a base disc 133 and a polishing pad 134 disposed on the base disc 133, the second mounting cavities 132 are formed on a side of the base disc 133 facing the housing 11, and the openings of the second mounting cavities 132 face the housing 11. In one embodiment, the polishing plate 13 has a plurality of second rubber sleeves 135 respectively disposed in the second mounting cavities 132 and providing a plurality of second ends 142 of the springs 14 disposed therein, and the second rubber sleeves 135 and the first rubber sleeves 112 can be appropriately deformed solid rubber bodies to provide a greater restraining force to the second end 142 of each spring 14, so that the second end 142 of each spring 14 is stably disposed in one of the second mounting cavities 132. Each second rubber sleeve 135 has a second cap 136 disposed in the second mounting cavity 132, and a second wing 137 extending from the periphery of the second cap 136 and disposed at the opening edge of the second mounting cavity 132.

Referring to fig. 8, the springs 14 of the present invention can be mounted as described later, in one embodiment, each spring 14 has a first set of joints 144 disposed at the first end 141 and fixed to the housing 11 through a first assembling member 161. The first set of joints 144 is not an integral part of each spring 14, and the first set of joints 144 can be attached to the main body of each spring 14 by machining or by design. Furthermore, the portion of the housing 11 providing the first assembling member 161 is not limited to the penetration of the first assembling member 161, and can be adjusted according to the design of the housing 11. In addition, the first assembling member 161 is not limited to the screw illustrated in the drawings, and any matching structure that can be fixed after assembling is not changed belongs to the scope of implementation of the first assembling member 161 and the first assembling joint 144. Referring to fig. 9, in an embodiment, each of the springs 14 has a second set of joints 145 disposed at the second end 142 and providing a second assembling member 162 disposed therein, and the forming manner and the implementation scope of the second set of joints 145 are the same as those of the first set of joints 144, which will not be described herein again. It should be noted that whether each of the springs 14 is provided with the first set of contacts 144 or the second set of contacts 145 can be adjusted according to implementation requirements and is not limited by the embodiments disclosed in the figures herein.

Referring to fig. 10, in an embodiment, a portion of the casing 11 where the first end 141 of each spring 14 is disposed is a first protruding pillar 115, and the first protruding pillar 115 is provided where the first end 141 of one of the springs 14 is sleeved. To increase the assembling strength between the first convex pillar 115 and one of the springs 14, an adhesive (not shown) may be coated on the first convex pillar 115 to assist the fixing. Furthermore, to prevent the springs 14 from being displaced by mistake, the size of the first protrusion 115 matches the diameter of each spring 14 at the first end 141. In addition to the foregoing, in an embodiment, the portion of the polishing disc 13 provided at the second end 142 of each spring 14 is a second protruding pillar 138, and the implementation concept of the second protruding pillar 138 is the same as that of the first protruding pillar 115, which is not repeated herein.

Referring to fig. 11, in one embodiment, the housing 11 includes a rectangular dust cover 116 facing the polishing disc 13, and the springs 14 are located at the corners of the rectangular dust cover 116.

Claims (14)

1. An abrasive disk stabilizing structure of an orbital motion grinder, comprising:

a housing;

a grinding power source mounted on the casing and having a driving shaft and a tool holder provided with the driving shaft and offset from the axis of the driving shaft;

a grinding disc, the center of which is arranged on the tool holder by a locking screw, and the grinding disc is driven by the grinding power source to perform an orbital motion relative to the casing; and

at least four springs, each of which has a first end disposed on the casing and a second end disposed on the grinding disc, wherein a free length of each spring is greater than a distance between an installation portion of the casing providing the first end and an installation portion of the grinding disc providing the second end, each spring is not completely compressed due to the distance, and when the second end of each spring deviates from a projection position of the first end in the process of the orbital motion of the grinding disc, the springs are stretched.

2. The abrasive disk stabilizing structure of an orbital grinder of claim 1, wherein the housing is provided with a first mounting pocket at a portion provided with each of the first ends.

3. The polishing disk stabilizing structure of an orbital grinder as set forth in claim 2, wherein the housing has a plurality of first rubber sleeves respectively disposed in the first mounting holes and provided with the first ends disposed therein.

4. The structure of claim 3, wherein each of the first rubber sleeves has a first cap inserted into the first mounting cavity and a first wing extending from a periphery of the first cap and disposed at an opening edge of the first mounting cavity.

5. The structure for stabilizing an abrasive disk of an orbital grinder as set forth in any one of claims 1 to 3 wherein the abrasive disk is provided with a second mounting hole at a portion thereof provided for each of the second ends.

6. The structure of claim 5, wherein the polishing disk comprises a base disk and a polishing pad disposed on the base disk, the base disk having a plurality of second mounting cavities formed on a side facing the housing.

7. The polishing disk stabilizing structure of an orbital grinder as set forth in claim 6 wherein the polishing disk has a plurality of second rubber sleeves respectively disposed in the second mounting holes and provided with the second ends disposed therein.

8. The structure of claim 7, wherein each second rubber sleeve has a second cap received in the second receiving cavity and a second wing extending from the periphery of the second cap and disposed at the opening edge of the second receiving cavity.

9. The abrasive disk stabilizing structure of an orbital grinder of claim 1, wherein each of the springs has a first set of tabs disposed at the first end and capable of being secured to the housing by a first set of fasteners.

10. An abrasive disc stabilizing arrangement in an orbital grinder as set forth in claim 1 or 9 wherein each of said springs has a second set of tabs disposed at said second end and providing a second set of connectors disposed therein.

11. The structure of claim 1, wherein the portion of the housing where the first end of each spring is disposed is a first protrusion.

12. The structure of claim 1 or 11, wherein the portion of the grinding disc provided with the second end of each spring is a second protrusion.

13. The abrasive disk stabilizing structure of an orbital grinder as set forth in claim 1, wherein said housing includes a rectangular dust cover facing said abrasive disk, said springs being located at end corners of said rectangular dust cover.

14. The abrasive disk stabilizing structure of an orbital motion grinder as set forth in any one of claims 1 to 4, wherein the abrasive disk is rectangular.

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