Grinding machine

Abstract

A polishing tool machine includes a housing, a driving assembly, a polishing plate, a switch, and a pressing plate. The driving assembly is disposed in the housing, and the polishing plate is driven by the driving assembly. The polishing plate has a polishing surface and a non-polishing surface. The switch is used to drive the driving assembly. The pressing plate is disposed in the housing. The pressing plate has a first state in which the pressing plate is operated to drive the switch to drive the driving assembly to drive the polishing plate, and a second state in which the pressing plate is not operated to stop the switch from driving the driving assembly. The polishing tool machine has a polishing plate braking structure. When the pressing plate is in the first state, the polishing plate braking structure does not contact the non-polishing surface. When the pressing plate is in the second state, the polishing plate braking structure moves to the non-polishing surface and contacts the polishing plate to stop the polishing plate from rotating.

Description

Technical Field

[0001] This invention relates to a grinding tool machine, and more particularly to a grinding tool machine in which the brake block does not contact the grinding disc when the pressure plate is operated. Background Technology

[0002] Please see Figure 1 The main structure of the conventional grinding machine tool 70 includes a motor 71, a working shaft 72 that rotates with the motor 71, a housing 73 that houses the motor 71 and the working shaft 72, a pressure plate 74 mounted on the housing 73 that determines whether the motor 71 operates based on the operating state, and a grinding disc 75 mounted on the working shaft 72 and driven by the working shaft 72. When the user intends to perform grinding operations, the user operates the pressure plate 74, causing the motor 71 to be driven and thus the working shaft 72 to be driven, so that the grinding disc 75 rotates with the working shaft 72 and performs grinding. When the user wants to stop the operation, the user releases the pressure plate 74, causing the motor 71 to stop driving the working shaft 72. At this time, although the grinding disc 75 is no longer driven, it will continue to rotate due to the inertia of the motor 71, the working shaft 72, and its own inertia until the inertial kinetic energy is dissipated. The aforementioned phenomenon means that even if the user stops driving the motor 71, the grinding disc 75 will continue to spin idle, making it impossible for the user to replace the consumables of the grinding tool 70 during this period, and also potentially affecting the user's safety.

[0003] Current technology has disclosed the structure of a brake liner 76 in the grinding machine tool 70, as shown in CN 1990180A, CN 206393407U, CN 207027181U, US 5595531A, US 5679066A, US5813903A, US 2002 / 019055A, EP 1277544A, GB 2273900A, GB 2359266A, GB 2416726A, and others. Figure 1 As shown. Continued with Figure 1The brake pad 76 is an elastic rubber ring located between the housing 73 and the grinding disc 75. The brake pad 76 is in constant contact with the grinding disc 75, providing resistance at all times. When the grinding machine 70 starts, the kinetic energy output by the motor 71 is greater than the resistance experienced by the grinding disc 75, causing the grinding disc 75 to rotate. When the motor 71 stops rotating, the resistance provided by the brake pad 76 is greater than the inertial force of the grinding disc 75, causing the grinding disc 75 to stop rotating. However, while the aforementioned embodiment achieves the effect of braking the grinding disc 75, it easily increases the load on the motor 71 due to the constant resistance provided by the brake pad 76. Furthermore, the grinding disc 75 is also prone to a decrease in rotational speed due to the resistance of the brake pad 76, thereby reducing grinding efficiency. Moreover, because the brake pad 76 is in constant contact with the grinding disc 75, it wears out rapidly. Summary of the Invention

[0004] The main objective of this invention is to solve the problem arising from the fact that conventional brake pads remain in contact with the grinding disc when the grinding disc rotates.

[0005] To achieve the above objectives, the present invention provides a grinding tool machine, which includes a housing, a drive assembly disposed in the housing, a grinding disc driven by the drive assembly and defining a grinding surface and a non-grinding surface, a switch capable of driving the drive assembly, and a pressure plate disposed in the housing. The pressure plate has a first state in which, when operated, the switch drives the drive assembly to drive the grinding disc, and a second state in which, when not operated, the switch stops driving the drive assembly to drive the grinding disc. Further, the grinding tool machine includes a grinding disc braking structure. When the pressure plate is in the first state, the grinding disc braking structure does not contact the non-grinding surface and maintains a distance from it. When the pressure plate is in the second state, the grinding disc braking structure moves towards the non-grinding surface and contacts the grinding disc to stop the rotation of the grinding disc.

[0006] In one embodiment, the grinding disc braking structure includes at least one connecting rod linked to the pressure plate and a braking block disposed on the connecting rod for contacting the non-grinding surface.

[0007] In one embodiment, the linkage includes a first portion actuated by the pressure plate and a second portion providing the brake block, the first portion forming a mounting groove in which the second portion is disposed and is position-adjustable.

[0008] In one embodiment, the first portion is formed with an elongated hole communicating with the assembly groove, and the second portion is formed with at least one assembly hole, which is assembled with a fastener passing through the elongated hole.

[0009] In one embodiment, the housing has a first connection portion, and the grinding tool has a first shaft that connects the first connection portion to the pressure plate and causes the pressure plate to contact the connecting rod and the switch when operated.

[0010] In one embodiment, the linkage is provided in multiple ways, and the multiple linkages are connected by a shaft connection. One of the multiple linkages is provided with the brake block, and another of the multiple linkages contacts the pressure plate to act as a actuator.

[0011] In one embodiment, the grinding disc braking structure includes a torsion spring disposed on the housing, the torsion spring having a first end abutting the housing and a second end abutting one of the plurality of links connected to the pressure plate.

[0012] In one embodiment, the housing has a second connection portion, and the grinding disc braking structure includes a second shaft disposed in the second connection portion and connected to the torsion spring and one of the plurality of connecting rods that are connected to the pressure plate. The second shaft serves as a fulcrum when one of the plurality of connecting rods connected to the pressure plate moves.

[0013] In one embodiment, one of the links connected to the pressure plate has a working end that can be pressed by the pressure plate and a swing end that is axially connected to another of the links. The working end is higher than the swing end when the link connected to the pressure plate is assembled with the housing.

[0014] In one embodiment, one of the plurality of links connected to the pressure plate has a rod body disposed in the housing and an extension arm extending from one side of the rod body to provide the torsion spring, the second end of the torsion spring abutting against the extension arm.

[0015] In one embodiment, the housing has a set of gas channels and a mounting hole for providing at least one of the plurality of the links, the mounting hole not communicating with the set of gas channels, one port of the mounting hole being located within the projection range of the pressure plate.

[0016] In one embodiment, the switch is positioned off-center from the center line of the pressure plate.

[0017] Through the aforementioned embodiments of the present invention, it has the following characteristics compared to conventional methods: the present invention, through the setting of the grinding disc braking structure, ensures that the grinding disc is not affected by the resistance of the grinding disc braking structure when it rotates, and at the same time, the grinding disc braking structure can also provide braking to the grinding disc when the grinding disc is about to stop rotating. Attached Figure Description

[0018] Figure 1 A schematic diagram of a conventional grinding machine equipped with brake pads;

[0019] Figure 2A three-dimensional schematic diagram of an embodiment of the present invention;

[0020] Figure 3 A structural exploded view of an embodiment of the present invention;

[0021] Figure 4 A partial structural exploded view of an embodiment of the present invention;

[0022] Figure 5 A top view schematic diagram of an embodiment of the present invention;

[0023] Figure 6 A schematic cross-sectional view of an embodiment of the present invention;

[0024] Figure 7 A cross-sectional view of another embodiment of the present invention;

[0025] Figure 8 A schematic diagram of an embodiment of the present invention;

[0026] Figure 9 A schematic diagram of linkage adjustment according to an embodiment of the present invention.

[0027] [Symbol Explanation]

[0028] 100: Grinding machine tool

[0029] 10: Outer shell

[0030] 11: First group connection

[0031] 12: Second group connection

[0032] 13: Assemble the boss

[0033] 14: Gas Channel

[0034] 141: Intake passage

[0035] 142: Vent Channel

[0036] 15: Mounting holes

[0037] 20: Driver Components

[0038] 21: Motor

[0039] 22: Working shaft

[0040] 30: Grinding disc

[0041] 31: Grinding surface

[0042] 32: Non-grinding surface

[0043] 40: Switch

[0044] 50: Pressure plate

[0045] 51: Opening

[0046] 52: Center line

[0047] 60: Grinding disc braking structure

[0048] 601: Spacing

[0049] 61: Linkage

[0050] 612: First Link

[0051] 613: Second Link

[0052] 614: Opening

[0053] 615: Workstation

[0054] 616: Swing end

[0055] 617: Through hole

[0056] 618:Through hole

[0057] 620: Auxiliary work block

[0058] 621: Rod body

[0059] 622: Extending Arm

[0060] 623: Hollowed-out area

[0061] 624: Assembly port

[0062] 625: Part One

[0063] 626: Part Two

[0064] 627: Assembly slot

[0065] 628: Long hole

[0066] 629: Assembly Hole

[0067] 630: Fastener

[0068] 631: Mounting bracket

[0069] 64: Brake block

[0070] 65: Torsion Spring

[0071] 651: First end

[0072] 652: Second end

[0073] 66: Second Axis

[0074] 67: Third Axis

[0075] 80: First Axis

[0076] 70: Grinding machine tool

[0077] 71: Motor

[0078] 72: Working shaft

[0079] 73: Outer shell

[0080] 74: Pressure plate

[0081] 75: Grinding disc

[0082] 76: Brake pads Detailed Implementation

[0083] The invention is described in detail below with reference to the accompanying drawings:

[0084] Please see Figures 2 to 6 This invention provides a grinding tool 100, which includes a housing 10, a drive assembly 20, a grinding disc 30, a switch 40, and a pressure plate 50. Specifically, the drive assembly 20 is disposed within the housing 10 and includes a motor 21 and a working shaft 22. The motor 21 is not limited to electric or pneumatic operation; it outputs power upon startup. The working shaft 22 is connected to and driven by the motor 21. The grinding disc 30 is connected to the working shaft 22 and rotates with the working shaft 22 to grind a workpiece. The switch 40 determines the on / off state of the drive assembly 20. When the switch 40 is activated, it drives the drive assembly 20; when activated again, it stops driving the drive assembly 20. The pressure plate 50 is disposed on the housing 10 and is operable. The pressure plate 50 determines whether to drive the drive assembly 20 according to the operation state. Specifically, the pressure plate 50 has a first state when it is operated and a second state when it is not operated. When the pressure plate 50 is in the first state, the switch 40 is activated and drives the drive assembly 20, so that the drive assembly 20 drives the grinding disc 30 to rotate. When the pressure plate 50 is in the second state, the switch 40 is no longer activated and stops driving the drive assembly 20, so that the drive assembly 20 stops driving the grinding disc 30.

[0085] As described above, when the switch 40 stops driving the drive assembly 20, the grinding disc 30 no longer receives kinetic energy from the drive assembly 20, but it will continue to rotate due to the inertia of the drive assembly 20 and its own inertia. To prevent the grinding disc 30 from spinning idly, the grinding tool 100 is equipped with a grinding disc braking structure 60, which is linked to the pressure plate 50 and used to brake the grinding disc 30. For a detailed explanation, please refer to [link to relevant documentation]. Figure 7 The grinding disc 30 has a grinding surface 31 and a non-grinding surface 32. The grinding surface 31 is located on the side of the grinding disc 30 facing the object to be ground and can grind the object. The non-grinding surface 32 is not used for grinding. The non-grinding surface 32 can be a surface of the grinding disc 30 facing the outer casing 10, or an inclined side of the grinding disc 30 used to connect the grinding surface 31 and the surface. When the grinding disc braking structure 60 contacts the surface or the inclined side, the grinding disc braking structure 60 provides resistance to the grinding disc 30 to stop the grinding disc 30 from rotating.

[0086] For a more detailed explanation of the implementation of this grinding tool 100, please refer to [link to relevant documentation]. Figures 7 to 8 Assuming that initially the pressure plate 50 is not operated and is in the second state, the grinding disc 30 is not driven and is in contact with the grinding disc braking structure 60, and is completely stationary, just as... Figure 7 As shown. When the pressure plate 50 is operated, it enters the first state, and the switch 40 drives the drive assembly 20, causing the grinding disc 30 to start rotating. At the same time, the grinding disc braking structure 60 is activated by the pressure plate 50, and it no longer contacts the non-grinding surface 32, maintaining a distance 601 between them. This allows the grinding disc 30 to rotate without the resistance of the grinding disc braking structure 60, just as... Figure 8 As shown. When the pressure plate 50 is no longer operated, it returns to the second state, and the switch 40 stops driving the drive assembly 20, thus deactivating the grinding disc 30. At this time, the grinding disc braking structure 60 moves toward the non-grinding surface 32 and contacts the grinding disc 30, causing the grinding disc 30 to be braked by the grinding disc braking structure 60, thereby stopping its rotation.

[0087] Please match Figure 1 and Figure 2 As described above, to address the issue of conventional grinding discs 75 still spinning even when not being driven, the present invention provides a grinding disc braking structure 60 on the grinding tool machine 100. This allows the grinding disc 30 to be braked by the grinding disc braking structure 60 when it stops being driven, and to quickly stop rotating. Furthermore, the grinding disc braking structure 60 of the present invention only provides braking when the grinding disc 30 is not driven. When the grinding disc 30 is driven, the grinding disc braking structure 60 does not contact the grinding disc 30, and therefore does not create resistance to the rotation of the grinding disc 30, reducing the kinetic energy loss of the drive assembly 20. This further improves the problem of conventional brake pads 76 rapidly wearing out due to prolonged friction with the grinding disc 75.

[0088] Please refer to the following: Figures 2 to 4 , Figure 7In one embodiment, the grinding disc braking structure 60 includes at least one connecting rod 61 and a braking block 64 disposed on the connecting rod 61. The connecting rod 61 faces the pressure plate 50, and the braking block 64 is disposed on the connecting rod 61 and driven by the connecting rod 61. When the pressure plate 50 enters the second state, the connecting rod 61 is moved by the pressure plate 50, causing the braking block 64 to contact the non-grinding surface 32.

[0089] Furthermore, the housing 10 forms a first connection portion 11, the pressure plate 50 forms at least one opening 51, and the grinding tool 100 has a first shaft 80. The opening 51 is provided corresponding to the first connection portion 11, and the first shaft 80 is located at the first connection portion 11 and the opening 51. Through the first shaft 80, when the pressure plate 50 changes from the second state to the first state, it can be displaced toward the housing 10, and the connecting rod 61 and the switch 40 are located on the displacement path of the pressure plate 50, so that when the pressure plate 50 enters the first state, it can press down the connecting rod 61 and the switch 40.

[0090] In another embodiment, please refer to Figures 2 to 4 , Figure 7 The connecting rod 61 can be provided in multiple ways, and the multiple connecting rods 61 are connected by a shaft. One of the multiple connecting rods 61 provides the brake block 64, and another of the multiple connecting rods 61 is linked to the pressure plate 50. For ease of explanation, the one of the multiple connecting rods 61 that provides the brake block 64 is temporarily designated as a first connecting rod 612, and the one of the multiple connecting rods 61 that is linked to the pressure plate 50 is designated as a second connecting rod 613. The second connecting rod 613 can be directly shafted to the first connecting rod 612, and the second connecting rod 613 and the first connecting rod 612 can also be assembled through other connecting rods 61. The second connecting rod 613 acts as the driver of the first connecting rod 612, and the second connecting rod 613 drives the first connecting rod 612 after being acted upon by the pressure plate 50.

[0091] Furthermore, the grinding disc braking structure 60 includes a torsion spring 65, which is disposed on the housing 10 and contacts the second connecting rod 613. The torsion spring 65 has a first end 651 and a second end 652. The first end 651 abuts against the housing 10, and the second end 652 abuts against the second connecting rod 613. When the second connecting rod 613 is driven by the pressure plate 50, the second end 652 is compressed by the second connecting rod 613, causing the torsion spring 65 to be compressed and store elastic force. When the second connecting rod 613 is no longer driven by the pressure plate 50, the torsion spring 65 releases the elastic force, and the second end 652 pushes against the second connecting rod 613, causing the second connecting rod 613 to return to its original position.

[0092] Continuing from the above, the outer casing 10 has a second connecting portion 12, and the second connecting rod 613 has at least one opening 614 corresponding to the second connecting portion 12. The grinding disc braking structure 60 has a second shaft 66, which connects to the torsion spring 65 and is located at the second connecting portion 12 and the opening 614. The second shaft 66 serves as a fulcrum for the movement of the second connecting rod 613, allowing the two ends of the second connecting rod 613 to swing relative to the outer casing 10 when driven by the pressure plate 50 or pushed by the torsion spring 65. Furthermore, the two ends of the second connecting rod 613 can be divided into a working end 615 and a swinging end 616. The working end 615 can be driven by the pressure plate 50, and the swinging end 616 is directly or indirectly connected to the first connecting rod 612. Because the swing end 616 is subjected to the gravity of the first connecting rod 612, the second connecting rod 613 is assembled with the outer casing 10 in an inclined position. That is, the horizontal height of the working end 615 is greater than the horizontal height of the swing end 616. In one embodiment, when the second connecting rod 613 is directly axially connected to the first connecting rod 612, the swing end 616 is formed with at least one through hole 617, and the first connecting rod 612 is formed with at least one through hole 618 corresponding to the through hole 617. The grinding disc braking structure 60 has a third shaft 67 provided in the through hole 617 and the through hole 618. The swing end 616 is axially connected to the first connecting rod 612 through the third shaft 67. When the working end 615 is pressed by the pressure plate 50, the swing end 616 lifts the first connecting rod 612 based on the lever action. In another embodiment, the second link 613 forms an auxiliary working block 620, which extends from the working end 615 toward the pressure plate 50. The extension direction of the auxiliary working block 620 is different from the tilt direction of the second link 613, thereby assisting the pressure plate 50 in pressing the working end 615.

[0093] In another embodiment, please refer to Figures 4 to 7 The housing 10 has an assembly boss 13 facing the pressure plate 50. The assembly boss 13 provides a mounting surface for the switch 40. The assembly boss 13 is adjacent to the working end 615 and does not interfere with the movement of the second connecting rod 613. Specifically, the pressure plate 50 has a center line 52, the working end 615 is located on the center line 52, and the assembly boss 13 is located to one side of the working end 615, causing the switch 40 to be offset from the center line 52. It should be noted that the range of the switch 40 must be within the area where the pressure plate 50 can simultaneously touch the switch 40 when pressing the working end 615, thereby allowing the pressure plate 50 to control both the working end 615 and the switch 40.

[0094] Furthermore, the second connecting rod 613 has a rod body 621 and an extension arm 622. The rod body 621 has a working end 615 and a swing end 616. The rod body 621 is mounted on the housing 10. The rod body 621 is formed with a hollow area 623, which prevents the second connecting rod 613 from interfering with the first assembly portion 11 when swinging. The extension arm 622 extends from one side of the rod body 621, and the extension arm 622 provides a place for the second end 652 of the torsion spring 65 to abut against it. In one embodiment, the extension arm 622 is formed with an assembly opening 624, which is located on the same extension line as the opening 614. The opening 614 provides a passage for the second shaft 66.

[0095] On the other hand, please see Figures 3 to 6 When the grinding machine tool 100 of the present invention is a pneumatic machine tool, the housing 10 has a set of gas channels 14 and a mounting hole 15. The set of gas channels 14 includes an inlet channel 141 and an outlet channel 142. The inlet channel 141 is controlled by the switch 40 to determine whether to drive the drive assembly 20. The outlet channel 142 is linked to the inlet channel 141 and provides gas discharge. The mounting hole 15 provides for at least one of the plurality of connecting rods 61. The mounting hole 15 is not connected to the set of gas channels 14. Furthermore, the mounting hole 15 described herein can be integrally formed by the housing 10, or it can be formed by two ports respectively provided on the housing 10. One of the ports of the mounting hole 15 is located within the projection range of the pressure plate 50.

[0096] In addition to the foregoing, please refer to Figures 7 to 9To adjust the height of the brake block 64 relative to the grinding disc 30, the present invention provides a connecting rod 61 for mounting the brake block 64, comprising a first portion 625 and a second portion 626. The second portion 626 is used for mounting the brake block 64. When there is an odd number of connecting rods 61, the first portion 625 is directly pressed by the pressure plate 50. When there are multiple connecting rods 61, the first portion 625 is directly or indirectly connected to the second connecting rod 613, which is also pressed by the pressure plate 50. Furthermore, the first portion 625 forms a mounting groove 627, which provides the second portion 626 for mounting and position adjustment. The mounting groove 627 restricts the second portion 626 to linear displacement only relative to the first portion 625. Furthermore, the first portion 625 has an elongated hole 628, which is connected to the mounting groove 627. The second portion 626 has at least one assembly hole 629. The first connecting rod 612 includes at least one fixing member 630, which is connected to the assembly hole 629 through the elongated hole 628, thereby fixing the assembly position of the second portion 626. Simultaneously, the present invention limits the displacement range of the second portion 626 relative to the first portion 625 through the provision of the elongated hole 628. In another embodiment, the first connecting rod 612 has a mounting base 631 disposed on the second portion 626. The size of the mounting base 631 is larger than the size of the second portion 626, and a brake block 64 is disposed thereon.

Claims

1. A grinding tool comprising a housing, a drive assembly disposed in the housing, a grinding disc driven by the drive assembly and defining a grinding surface and a non-grinding surface, a switch capable of driving the drive assembly, and a pressure plate disposed in the housing, the pressure plate having a first state in which, when operated, the switch drives the drive assembly to drive the grinding disc, and a second state in which, when not operated, the switch stops driving the drive assembly to drive the grinding disc, characterized in that: The grinding tool has a grinding disc braking structure. When the pressure plate is in the first state, the grinding disc braking structure does not contact the non-grinding surface and maintains a distance. When the pressure plate is in the second state, the grinding disc braking structure moves toward the non-grinding surface and contacts the grinding disc to stop the rotation of the grinding disc. The grinding disc braking structure includes at least one connecting rod linked to the pressure plate and a brake block disposed on the connecting rod for contacting the non-grinding surface. The connecting rod is arranged in a plurality of ways and is connected by a shaft. One of the connecting rods is provided with the brake block, and another of the connecting rods contacts the pressure plate as a actuator. The grinding disc braking structure includes a torsion spring disposed on the housing. The torsion spring has a first end that abuts against the housing and a second end that abuts against one of the connecting rods linked to the pressure plate.

2. The grinding tool machine as described in claim 1, characterized in that, The linkage includes a first part actuated by the pressure plate and a second part providing the brake block, the first part being formed into a mounting groove in which the second part is disposed and can be adjusted in position.

3. The grinding machine tool as described in claim 2, characterized in that, The first part is formed with an elongated hole communicating with the assembly groove, and the second part is formed with at least one assembly hole, which is assembled with a fastener passing through the elongated hole.

4. The grinding machine tool as described in claim 3, characterized in that, The housing has a first joint, and the grinding tool has a first shaft connecting the first joint to the pressure plate.

5. The grinding tool machine as described in claim 4, characterized in that, The housing has a second connection portion, and the grinding disc braking structure includes a second shaft disposed in the second connection portion and connected to the torsion spring and one of the plurality of connecting rods that are connected to the pressure plate. The second shaft serves as a fulcrum when one of the plurality of connecting rods connected to the pressure plate moves.

6. The grinding machine tool as described in claim 5, characterized in that, One of the links connected to the pressure plate has a working end that can be pressed by the pressure plate and a swing end that is axially connected to another link. The working end of the link connected to the pressure plate is assembled with the housing in such a way that the swing end is higher than the pressure plate.

7. The grinding machine tool as described in claim 6, characterized in that, One of the linkages that is connected to the pressure plate has a rod body disposed in the housing and an extension arm extending from one side of the rod body to provide the torsion spring, the second end of the torsion spring abutting against the extension arm.

8. The grinding machine tool as described in claim 4, characterized in that, The housing has a set of gas passages and a mounting hole for at least one of the plurality of the connecting rods, the mounting hole not communicating with the set of gas passages, one port of the mounting hole being located within the projection range of the pressure plate.

9. The grinding machine tool as described in claim 8, characterized in that, The switch is set off-center from the pressure plate.

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