Orbiting mill grinding disc stabilisation

Abstract

A kind of track motion grinder's grinding disc stabilizing structure, including a shell, a grinding power source, a grinding disc and at least four springs.The grinding power source is assembled on the shell and has a drive shaft and a tool holder arranged on the drive shaft and offset from the drive shaft axis, the grinding disc is arranged on the tool holder with a locking screw, and the grinding disc is driven by the grinding power source to perform a track motion.The two ends of the springs are respectively on the shell and the grinding disc, the free length of each spring is greater than the distance between the spring mounting position provided by the shell and the same spring mounting position provided by the grinding disc, and each spring is not completely compressed due to the distance, and the springs are stretched to maintain the stability of the grinding disc during the track motion of the grinding disc.

Description

Technical Field

[0001] This invention relates to a grinding disc stabilization structure for a track-motion grinding machine, and more particularly to a grinding disc stabilization structure that can solve the problem of the grinding disc edge erroneously lifting when conventional track-motion grinding machines rotate. Background Technology

[0002] Grinding machines can move in the following ways: rotary motion, reciprocating motion, orbital motion, and random orbital motion. Among these, a grinding machine that uses orbital motion to grind the workpiece is called an orbital sander. The basic structure of an orbital sander is as follows: a power motor is housed within a casing. A spindle of the power motor is connected to an eccentric device to form an eccentric shaft, which drives a grinding disc through a bearing.

[0003] When the eccentric shaft of the track-motion grinding machine drives the grinding disc to move along an eccentric track, the grinding disc will be affected by the moment of inertia (also known as the moment of inertia) and will produce a vibration similar to drifting. This causes the grinding disc to perform grinding in an unstable track motion, which in turn affects the final grinding effect.

[0004] The solution to the aforementioned problem is to install a pad support between the housing and the grinding disc. This pad support limits the vibrations caused by the rotational inertia of the grinding disc, allowing it to maintain stable orbital motion within a pendulum diameter. There are two existing implementation schemes for the pad support: one is a fence-type pad support (such as...). Figure 1 The first type is shown as 40), and the second type is a cylindrical hanger (such as...). Figure 2 (50 shown). Front-pointing fence-type hangers are disclosed as in patents US6979254, EP2815843, JP2016030303A, and JP2013220493A. Cylindrical hangers are disclosed as in patents JP2004066420A, JP3694342B2, CN205184482U, CN105983893A, CN105922106A, and GB2104422A.

[0005] When the track-motion grinding machine is working, the eccentric displacement is approximately 10,000 to 12,000 times per minute, and under continuous operation, it will reach hundreds of thousands of times per hour, or about 15 million times per day. This means that the hanger will be constantly stretched while the track-motion grinding machine is working. When the track-motion grinding machine is mounted on a robotic arm and operates all day, the hanger will be stretched tens of millions of times per day, which will be a great test for the lifespan of the hanger.

[0006] While the aforementioned two implementation schemes feature a bendable hanger, they lack tensile strength; that is, the hanger's length cannot be increased by external force. When the track-motion grinding machine is operating, the grinding disc is displaced by the eccentric shaft, causing the hanger's location on the grinding disc to deviate from its location on the machine housing. This increases the direct distance between the hanger's location on the grinding disc and its location on the machine housing. This increased direct distance can be explained using a right-angled triangle analogy. When the track-motion grinding machine is not operating, the hanger's position resembles the opposite side of a right-angled triangle (e.g., ...). Figure 3 (41) When the track-motion grinding machine is working, the offset of the hanger at the location of the grinding disc is the adjacent side of the right triangle (e.g., ...). Figure 3 In section 42), the distance between the location where the hanger is positioned on the grinding disc and the location where the hanger is positioned on the machine housing is the hypotenuse of the right triangle (e.g., ...). Figure 3 (43) From the basic concept of a right triangle, it can be directly understood that the hypotenuse 43 of a right triangle is greater than the opposite side 41, which proves what this paragraph refers to. However, because the hanger does not have tensile properties, it cannot cope with the problem of increasing direct distance, resulting in the problem of incorrect lifting of the edge area of ​​the grinding disc (such as...). Figure 3 The indicated 60) causes the grinding disc to lose its accurate flatness, affecting the grinding quality.

[0007] Furthermore, due to the non-stretchable nature of the existing hanger, the eccentric displacement distance of the grinding disc of the track-motion grinding machine is limited, making it impossible to implement a larger eccentric distance. Summary of the Invention

[0008] The main objective of this invention is to solve the problem that the edge of the grinding disc erroneously lifts up when the grinding disc rotates due to the addition of a hanger in the track-motion grinding machine.

[0009] To achieve the above objectives, the present invention provides a grinding disc stabilization structure for a track-motion grinding machine, comprising a housing, a grinding power source, a grinding disc, and at least four springs. The grinding power source is mounted on the housing and has a drive shaft and a tool holder disposed on the drive shaft but offset from its axis. The grinding disc is centrally mounted on the tool holder with a locking screw, and the grinding disc undergoes track motion relative to the housing under the influence of the grinding power source. Each spring has a first end disposed on the housing and a second end disposed on the grinding disc. The free length of each spring is greater than the distance between the housing providing the mounting portion of the first end and the grinding disc providing the mounting portion of the second end. Each spring is not fully compressed due to this distance. During the track motion of the grinding disc, when the second end of each spring deviates from the projected position of the first end, the springs are stretched.

[0010] In one embodiment, the housing has a first mounting cavity at the location where each spring is provided.

[0011] In one embodiment, the housing has a plurality of first mounting holes respectively disposed therein and provides first sleeves for disposing of first ends therein.

[0012] In one embodiment, each of the first rubber sleeves has a first cap body inserted into 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.

[0013] In one embodiment, the grinding disc has a second mounting cavity at each of the portions providing the second ends.

[0014] In one embodiment, the grinding disc includes a base disc and a grinding pad disposed on the base disc, the base disc having a plurality of the second mounting holes formed on the side facing the housing.

[0015] In one embodiment, the grinding disc has a plurality of second mounting holes respectively disposed therein and provides second sleeves with second ends disposed therein.

[0016] In one embodiment, each of the second rubber sleeves has a second cap body inserted into 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.

[0017] In one embodiment, each spring has a first connector disposed at the first end and fixed to the housing via a first connector.

[0018] In one embodiment, each of the springs has a second set of connectors disposed at the second end and wherein a second set of connectors is disposed.

[0019] In one embodiment, the housing includes a rectangular dust cover facing the grinding disc, with the springs positioned at the corners of the rectangular dust cover.

[0020] In one embodiment, the housing provides a first protrusion at the first end of each spring.

[0021] In one embodiment, the grinding disc provides a second protrusion at the second end of each spring.

[0022] In one embodiment, the grinding disc is rectangular.

[0023] The present invention, through the aforementioned embodiments, has the following characteristics compared to conventional designs: The present invention replaces the conventional hanger design with springs, and the free length of each spring is greater than the distance between the first end mounting portion of the housing and the second end mounting portion of the grinding disc. During the track movement of the grinding disc, when the second end of each spring deviates from the projected position of the first end, the springs will be stretched. The deformation of each spring compensates for the change in distance between the first and second ends, thus maintaining the stability of the grinding disc. Attached Figure Description

[0024] Figure 1 A schematic diagram of the structure of a conventional track-motion grinding machine implemented with a fence-type hanger;

[0025] Figure 2 A schematic diagram of the structure of a conventional track-motion grinding machine implemented with a cylindrical hanger;

[0026] Figure 3 A schematic diagram illustrating the implementation of a conventional track-motion grinding machine where the edge area of ​​the grinding disc is incorrectly lifted.

[0027] Figure 4 A schematic cross-sectional view of the track motion grinding machine according to the first embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the stabilizing structure of the grinding disc in the first embodiment of the present invention;

[0029] Figure 6 A schematic diagram of the first embodiment of the grinding disc stabilization structure of the present invention;

[0030] Figure 7 A schematic diagram of the displacement of the second end of the spring in the grinding disc stabilizing structure of the first embodiment of the present invention;

[0031] Figure 8 A schematic diagram of the stabilizing structure of the grinding disc in the second embodiment of the present invention;

[0032] Figure 9 A schematic diagram of the stabilizing structure of the grinding disc in the third embodiment of the present invention;

[0033] Figure 10 A schematic diagram of the stabilizing structure of the grinding disc in the third embodiment of the present invention;

[0034] Figure 11 A partial structural diagram of the track-motion grinding machine according to the first embodiment of the present invention.

[0035] [Symbol Explanation]

[0036] 10: Track-Motion Grinding Machine

[0037] 11: Chassis

[0038] 111: First installation hole

[0039] 112: First rubber sleeve

[0040] 113: First cap body

[0041] 114: First wing

[0042] 115: First convex post

[0043] 116: Rectangular dust cover

[0044] 12: Grinding power source

[0045] 121: Motor

[0046] 122: Drive shaft

[0047] 123: Tool holder

[0048] 124: Drive shaft center

[0049] 125: Tool holder spindle

[0050] 126: Movement trajectory

[0051] 13: Grinding disc

[0052] 131: Locking screws

[0053] 132: Second installation hole

[0054] 133: Basic Platform

[0055] 134: Grinding pad

[0056] 135: Second rubber sleeve

[0057] 136: Second cap body

[0058] 137: Second Wing

[0059] 138: Second convex pillar

[0060] 14: Spring

[0061] 141: First End

[0062] 142: Second End

[0063] 143: Free Length

[0064] 144: First set of connectors

[0065] 145: Second set of connectors

[0066] 15: Spacing

[0067] 161: First group of recipients

[0068] 162: Second set of receiving parts

[0069] 20: The original position of the second end

[0070] 21: Position after the second end displacement

[0071] 40: Hanger

[0072] 41: Opposite side

[0073] 42: Adjacent side

[0074] 43: Hypotenuse

[0075] 50: Hanger

[0076] 60: Indication of raised edge Detailed Implementation

[0077] The invention is described in detail below with reference to the accompanying drawings:

[0078] Please see Figure 4 and Figure 5This invention provides a grinding disc stabilization structure for a track-motion grinding machine 10, which is a handheld machine tool. The grinding disc stabilization structure includes a housing 11, a grinding power source 12, a grinding disc 13, and at least four springs 14. The housing 11 is designed to be easily gripped by the user, and the grinding power source 12 is housed within it. The grinding power source 12 includes a motor 121, a drive shaft 122, and a tool holder 123. The motor 121 can be a pneumatic motor or an electric motor, depending on the implementation requirements, and is not limited to the depiction in this invention. The drive shaft 122 can actually be implemented as a spindle of the motor 121, meaning that in one embodiment, a rotor of the motor 121 is mounted on the drive shaft 122. The tool holder 123 is mounted on the drive shaft 122, and the center of the tool holder 123 is offset from the axis of the drive shaft 122. Furthermore, the grinding disc 13 is mounted on the tool holder 123 at its center by a locking screw 131, and the grinding disc 13 is driven by the grinding power source 12 to perform an orbital motion relative to the housing 11. Further, the grinding disc 13 is rectangular.

[0079] Continuing on the above, each spring 14 has a first end 141 disposed on the housing 11 and a second end 142 disposed on the grinding disc 13. The free length 143 of each spring 14 of the present invention is greater than the distance 15 between the portion of the housing 11 where the first end 141 is mounted and the portion of the grinding disc 13 where the second end 142 is mounted. When each spring 14 of the present invention is assembled, because the free length 143 is greater than the distance 15, each spring 14 will be pre-compressed. However, it should be noted that each spring 14 of the present invention is not fully compressed due to the distance 15; therefore, each spring 14 of the present invention must not be a tension spring.

[0080] Please refer to the following: Figure 5 and Figure 7 The following explains how the stabilizing structure of the grinding disc of the present invention ensures that the grinding disc 13 remains flat and stable when the track-motion grinding machine 10 is started. First, it will be explained that... Figure 7 This is a schematic diagram drawn based on the upward or downward view of the track-moving grinding machine 10. Figure 7In the diagram, 124 represents the axis of the drive shaft 122, 125 represents the axis of the tool holder 123, 126 represents the trajectory of the tool holder 123 when driven by the drive shaft 122, 20 represents the original position of the second end 142 of each spring 14, and 21 represents the position of the second end 142 of each spring 14 as it moves with the grinding disc 13. When the track-motion grinding machine 10 is started, the grinding power source 12 drives the grinding disc 13 to generate track motion for grinding. During the track motion of the grinding disc 13, the second end 142 of each spring 14 located on the grinding disc 13 will shift relative to the first end 141 of the same spring 14 as the grinding disc 13 moves (e.g., ...). Figure 7 As indicated by 20 and 21), when the second end 142 deviates 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 will be longer than the spacing 15. At this time, the springs 14 are stretched. It should also be understood that the stretching described in this invention is based on a comparison of the springs 14 when the grinding disc 13 is not in operation. The change in the state of each spring 14 precisely compensates for the change in the distance between the first end 141 and the second end 142, so that the grinding disc 13 can remain stable, specifically solving the problem of unstable operation of the grinding disc 13 derived from conventional assembly hangers. In addition, this invention also solves the problem of poor service life of conventional hangers through the aforementioned design.

[0081] Please refer to the following: Figure 5 and Figure 6 The housing 11 may have a first mounting cavity 111 at the location where each of the first ends 141 is provided. The opening of the first mounting cavity 111 faces the grinding disc 13. The first mounting cavity 111 is circular, and its diameter corresponds to the diameter of the first end 141 of each of the springs 14. Furthermore, each first mounting cavity 111 may have an appropriate depth to increase the stability of each spring 14 after installation. It should be noted that the degree to which each spring 14 is inserted into one of the first mounting cavities 111 should not affect the normal operation of each spring 14. To prevent the springs 14 from erroneously falling off when the track-moving grinding machine 10 is started, in one embodiment, the housing 11 also has a plurality of first rubber sleeves 112 respectively disposed in a plurality of the first mounting cavities 111. Each first rubber sleeve 112 is made of a deformable solid colloid, such as rubber. The first rubber sleeves 112 provide greater restraining force to the first ends 141 of the springs 14, thus securing them firmly within the first mounting holes 111. Furthermore, each of the first rubber sleeves 112 may have a first cap 113 inserted into the first mounting hole 111, and a first flap 114 extending from the periphery of the first cap 113 and disposed at the edge of the opening of the first mounting hole 111.

[0082] Please refer to the following: Figure 5 and Figure 6 The grinding disc 13 has a second mounting cavity 132 at the portion where the second end 142 of each spring 14 is located. The design concept of the second mounting cavity 132 is the same as that of the first mounting cavity 111, and will not be described again here. Furthermore, the grinding disc 13 includes a base disc 133 and a grinding pad 134 disposed on the base disc 133. The second mounting cavities 132 are formed on the 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 grinding disc 13 has a plurality of second rubber sleeves 135 respectively disposed within the second mounting holes 132 and providing a plurality of second ends 142 of the springs 14 therein. The second rubber sleeves 135 may be, like the first rubber sleeves 112, appropriately deformable solid colloids to provide greater restraining force on the second end 142 of each spring 14, ensuring that the second end 142 of each spring 14 is stably disposed within one of the second mounting holes 132. Furthermore, each second rubber sleeve 135 has a second cap 136 inserted into the second mounting hole 132, and a second wing 137 extending from the periphery of the second cap 136 and disposed at the edge of the opening of the second mounting hole 132.

[0083] Please see Figure 8 The installation of the springs 14 of the present invention can also be implemented as described later. In one embodiment, each spring 14 has a first connector 144 disposed at the first end 141 and fixed to the housing 11 through a first connector 161. The first connector 144 is not integrally formed with each spring 14; it can be assembled to the body of each spring 14 by machining or its own structural design. Furthermore, the housing 11 provides a portion for the first connector 161 to be assembled, not limited to the extent shown in the drawings where the first connector 161 can penetrate, but can be adjusted according to the design of the housing 11. In addition, the first connector 161 is not limited to the screw shown in the drawings; any mating structure that does not change the fixed fit after assembly falls within the scope of the implementation of the first connector 161 and the first connector 144 described herein. Please refer to [link to relevant documentation]. Figure 9 In one embodiment, each spring 14 has a second set of connectors 145 disposed at the second end 142 and provided with a second set of connectors 162 disposed therein. The forming method and implementation scope of the second set of connectors 145 are the same as those of the first set of connectors 144 described above, and will not be repeated here. It should be noted that whether each spring 14 has the first set of connectors 144 or the second set of connectors 145 can be adjusted according to implementation requirements and is not limited to the embodiments shown in the accompanying drawings.

[0084] Please see Figure 10In one embodiment, the housing 11 provides a first protrusion 115 at the first end 141 of each spring 14, on which the first end 141 of one of the springs 14 is fitted. To increase the connection strength between the first protrusion 115 and one of the springs 14, an adhesive (not shown) can be applied to the first protrusion 115 to assist in fixing. Furthermore, to prevent the springs 14 from misaligning, the size of the first protrusion 115 matches the diameter of the first end 141 of each spring 14. In addition to the foregoing, in one embodiment, the grinding disc 13 provides a second protrusion 138 at the second end 142 of each spring 14. The implementation concept of the second protrusion 138 is the same as that of the first protrusion 115, and will not be described in detail here.

[0085] Please see Figure 11 In one embodiment, the housing 11 includes a rectangular dust cover 116 facing the grinding disc 13, with springs 14 located at the corners of the rectangular dust cover 116.

Claims

1. A grinding disc stabilization structure for a track-motion grinding machine, characterized in that, Include: A housing with multiple primary mounting holes; A grinding power source is mounted on the housing and has a drive shaft, and a tool holder disposed on the drive shaft and offset from the axis of the drive shaft; A grinding disc is centrally mounted on the tool holder with a locking screw. The grinding disc includes a base disc and a grinding pad disposed on the base disc. The base disc has a plurality of second mounting holes formed on the side facing the housing. The grinding disc is subjected to a grinding power source to perform an orbital movement relative to the housing. and At least four springs, each having a first end located in the first mounting cavity on the housing and a second end located in the second mounting cavity on the grinding disc, wherein the free length of each spring is greater than the distance between the mounting portion of the first end on the housing and the mounting portion of the second end on the grinding disc, and each spring is not fully compressed due to the distance, and the springs are stretched when the second end of each spring deviates from the projected position of the first end during the track movement of the grinding disc, wherein: The first mounting holes on the housing and / or the second mounting holes on the grinding disc are provided with multiple rubber sleeves, which provide the first and / or second ends of the at least four springs disposed therein; and Each of the rubber sleeves has a cap body that is inserted into the first mounting cavity or the second mounting cavity, and a wing extending from the periphery of the cap body and disposed at the edge of the opening of the first mounting cavity or the second mounting cavity.

2. The grinding disc stabilization structure of the track-motion grinding machine as described in claim 1, characterized in that, Each of the springs has a first set of connectors located at the first end and capable of being fixed to the housing via a first set of connectors.

3. The grinding disc stabilization structure of the track-motion grinding machine as described in claim 1 or 2, characterized in that, Each of the springs has a second set of connectors disposed at the second end and provided therein with a second set of connectors.

4. The stabilizing structure of the grinding disc in the track-motion grinding machine as described in claim 1, characterized in that, The housing provides a first protrusion at the first end of each spring.

5. The grinding disc stabilization structure of the track-motion grinding machine as described in claim 1 or 4, characterized in that, The grinding disc provides a second protrusion at the second end of each spring.

6. The grinding disc stabilization structure of the track-motion grinding machine as described in claim 1, characterized in that, The housing includes a rectangular dust cover facing the grinding disc, with springs located at the corners of the rectangular dust cover.

7. The stabilizing structure of the grinding disc in the track-motion grinding machine as described in claim 1, characterized in that, The grinding disc is rectangular.

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