Abrasive belt grinding machine and device for changing angle of abrasive belt in two directions

Abstract

This invention relates to a belt grinder and a bidirectional belt angle changing device for machining surfaces with inward-curved undercut surfaces. The belt grinder includes a frame, a belt shaft mounted on the frame, and a belt for machining, mounted on the belt shaft. The bidirectional belt angle changing device includes a rotating arm and a drive mechanism for rotating the rotating arm. The rotating arm is mounted via a shaft and has a first end and a second end. The output shaft of the drive mechanism acts on the first end of the rotating arm, and the second end is provided with a rotating component for changing the belt angle so that the contact position between the belt and the belt shaft changes under the drive mechanism. This allows for the machining of complex left or right inward-curved surfaces, while reducing complex and cumbersome programming. Complex inward-curved undercut surfaces can be machined using only two axes. The device is ingenious in structure, easy to operate, and easy to control, bringing great convenience to belt grinding.

Description

Technical Field

[0001] This invention relates to the technical field of bidirectional belt angle changing devices, specifically to a belt grinding machine and its bidirectional belt angle changing device. Background Technology

[0002] CNC belt grinders are widely used in the metal processing industry. Currently, CNC belt grinders play an important role in curved surface grinding. However, when grinding concave curved surfaces, interference can occur, sometimes making the surface impossible to grind. This necessitates the use of more complex four-axis machine tools, which also increases programming difficulty. Therefore, it is necessary to provide a new device capable of adapting to the grinding of such concave curved surfaces, minimizing the use of complex multi-axis mechanisms, avoiding interference, and enabling smooth grinding of concave curved surfaces. Simultaneously, it reduces complex and cumbersome programming, and could even process some complex concave inverted curved surfaces using only two axes. Summary of the Invention

[0003] In view of this, a belt grinder and a bidirectional belt angle changing device are provided, which can realize the processing of complex inner arc inverted curved surface workpieces with two axes and has a clever structure.

[0004] A bidirectional belt angle changing device is provided for machining a curved surface with an inner arc undercut on a belt grinder. The belt grinder includes a frame, a belt shaft mounted on the frame, and a belt for machining mounted on the belt shaft. The bidirectional belt angle changing device includes a rotating arm and a drive mechanism for driving the rotating arm to rotate. The rotating arm is mounted via a rotating shaft and has a first end and a second end. The output shaft of the drive mechanism acts on the first end of the rotating arm, and the second end is provided with a rotating component for changing the belt angle so that the contact position between the belt and the belt shaft is changed under the drive of the drive mechanism.

[0005] Preferably, the rotating component includes three rotating shafts, namely a first rotating shaft, a second rotating shaft, and a third rotating shaft, and the sanding belt is divided into a feed section and a rotation section. The feed section of the sanding belt passes between the first rotating shaft and the second rotating shaft, and the rotation section of the sanding belt passes between the second rotating shaft and the third rotating shaft.

[0006] In some specific embodiments, the second rotating shaft is located between the first rotating shaft and the third rotating shaft. The second rotating shaft is closer to the sanding belt shaft than the first rotating shaft and the third rotating shaft. The three rotating shafts are arranged in a straight line or a triangular pattern. The first rotating shaft and the third rotating shaft are symmetrically arranged with the second rotating shaft as the center.

[0007] In some preferred embodiments, the rotating element has an outer circumferential surface for contacting the sanding belt, and the rotating element is cylindrical.

[0008] Specifically, the drive mechanism is movably mounted on a support frame, the drive mechanism is a cylinder, and the support frame is mounted on the frame.

[0009] In some preferred embodiments, the drive mechanism is movably suspended on a frame or support.

[0010] In some specific embodiments, the first end and the second end are respectively located at the two ends of the rotating shaft. Under the drive of the driving mechanism, the second end can swing around the rotating shaft. The swing of the second end is centered on the longitudinal axis passing through the sanding belt shaft. The driving mechanism has a predetermined driving stroke so that the second end can swing from the left side to the right side of the longitudinal axis of the sanding belt shaft. When the second end swings to the left side of the longitudinal axis of the sanding belt shaft, the rotating component pulls the sanding belt so that the sanding belt contacts the right semicircular surface of the sanding belt shaft so that the right inner arc surface of the workpiece can be processed. When the second end swings to the right side of the longitudinal axis of the sanding belt shaft, the rotating component pulls the sanding belt so that the sanding belt contacts the left semicircular surface of the sanding belt shaft so that the left inner arc surface of the workpiece can be processed.

[0011] Specifically, a connecting ring is provided at the rear end of the cylinder away from the output shaft, and a fixing ring is provided on the support frame, with the connecting ring fastened to the fixing ring.

[0012] Furthermore, the rotating shaft and the sanding belt shaft are on the same straight line in the longitudinal direction.

[0013] Furthermore, the present invention also provides a belt grinding machine, which includes a frame, a belt shaft mounted on the frame, a belt for processing mounted on the belt shaft, and a bidirectional belt angle changing device as described above.

[0014] In the aforementioned bidirectional belt angle changing device and belt grinder, a drive mechanism drives a rotating arm to rotate, and the second end of the rotating arm also rotates accordingly. The rotating component pulls the belt to change its angle, altering the contact position between the belt and the belt shaft. For example, when the second end is brought to the left of the longitudinal axis of the belt shaft, the belt contacts the right semicircular surface of the belt shaft. At this time, the right semicircular surface of the belt shaft presses against the belt, thus enabling the machining of the right inner arc surface of the workpiece. When the second end swings to the right of the longitudinal axis of the belt shaft, the belt can machine the left inner arc surface of the workpiece. This allows the belt to avoid interference, facilitating the grinding of both left and right inner arc surfaces. Simultaneously, it reduces complex and cumbersome programming, enabling the machining of complex inner arc undercut surfaces using only two axes. The entire device can achieve the above functions by adding a rotating arm and a drive mechanism such as a cylinder. The structure is ingenious, and the cylinder is easy to operate and control, showing promising application prospects. Attached Figure Description

[0015] Figure 1This invention displays a three-dimensional structure of a belt grinder with a bidirectional belt angle changing device provided in an embodiment of the invention.

[0016] Figure 2 middle Figure 1 The main view of the belt grinder is shown, with the rotating arm in its initial state.

[0017] Figure 3 yes Figure 1 A schematic diagram of the structure of the bidirectional belt angle changing device for machining the left inner arc surface when the rotating arm swings to the right.

[0018] Figure 4 yes Figure 1 A schematic diagram of the structure of the bidirectional sanding belt angle changing device in which the rotating arm swings to the left to process the right inner arc surface. Detailed Implementation

[0019] The present invention will now be described in detail with reference to specific embodiments and accompanying drawings.

[0020] Please see Figure 1 and Figure 2 This illustration shows an embodiment of the present invention providing a belt grinding machine 100 with a bidirectional belt angle changing device for machining surfaces with an inner arc undercut. The belt grinding machine 100 includes a frame 101, a belt shaft 11 mounted on the frame 101, and a belt 12 mounted on the belt shaft 11 for machining. The bidirectional belt angle changing device includes a rotating arm 20 and a drive mechanism 30 for driving the rotating arm 20 to rotate. The rotating arm 20 is mounted via a rotating shaft 23 and has a first end 21 and a second end 22. The output shaft 32 of the drive mechanism 30 acts on the first end 21 of the rotating arm 20, and the second end 22 is provided with a rotating element for changing the belt angle so that the contact position between the belt 12 and the belt shaft 11 is changed.

[0021] Specifically, such as Figure 2 As shown, the rotating component includes three rotating shafts, namely a first rotating shaft 151, a second rotating shaft 152, and a third rotating shaft 153. The sanding belt 12 is divided into a feed section 121 and a rotation section 122. The feed section 121 of the sanding belt 12 passes between the first rotating shaft 151 and the second rotating shaft 152, and the rotation section 122 of the sanding belt 12 passes between the second rotating shaft 151 and the third rotating shaft 152.

[0022] In some specific embodiments, the second rotating shaft 152 is located between the first rotating shaft 151 and the third rotating shaft 153. The second rotating shaft 152 is closer to the sanding belt shaft 11 than the first rotating shaft 151 and the third rotating shaft 153. The three rotating shafts are arranged in a straight line or a triangular pattern, with the first rotating shaft 151 and the third rotating shaft 153 symmetrically arranged with the second rotating shaft 152 as the center. Specifically, the distance between each pair of rotating shafts is such that the width of the sanding belt after passing around the rotating shaft is slightly greater than or equal to the diameter of the sanding belt shaft 11. In some preferred embodiments, the rotating element has an outer circumferential surface to contact the sanding belt 12. The rotating element is a cylindrical body, i.e., a roller shape, and can be a hollow roller, i.e., equipped with rolling bearings or sliding bearings.

[0023] Specifically, the drive mechanism 30 is movably mounted on a support frame 33, the drive mechanism 30 being a cylinder 31, and the support frame 33 being mounted on the frame 101. In some preferred embodiments, the drive mechanism 30 is movably suspended from the frame 101 or the support frame 33. Specifically, as... Figure 2 or Figure 3 As shown, the cylinder 31 has a connecting ring 35 at its rear end away from the output shaft 32, and the support frame 33 has a fixing ring 36. The connecting ring 35 is fastened to the fixing ring 36. This two-ring interlocking design serves both to fix the cylinder and to allow the drive mechanism, such as the cylinder, to move freely when driving the rotating arm 20, preventing interference caused by the arc-shaped swing of the first end 21 of the rotating arm 20. The first end 21 of the rotating arm 20 is also connected to the output shaft 32 of the drive mechanism 30 via a movable connection, such as a hinge or a rotating shaft. The second end 22 of the rotating arm 20 is preferably arc-shaped to accommodate the swinging structure and minimize interference with the sanding belt shaft 11 and its mounting structure.

[0024] As shown in the figure, the first end 21 and the second end 22 are located at the two ends of the rotating shaft 23, respectively. Under the drive of the driving mechanism 30, the second end 22 can swing around the rotating shaft 23. The swing of the second end 22 is centered on the longitudinal axis passing through the sanding belt shaft 11. The driving mechanism 30 has a predetermined driving stroke so that the second end 22 can swing from the left side to the right side of the longitudinal axis of the sanding belt shaft 11. The predetermined driving stroke is related to the curvature and arc length of the inner arc surface to be processed.

[0025] like Figure 3 As shown, when the second end 22 swings to the left of the longitudinal axis of the sanding belt shaft 11, the rotating component pulls the sanding belt 12 so that the sanding belt 12 contacts the sanding belt shaft 11 on the right semicircular surface of the sanding belt shaft 11, so that the right inner arc surface 62 of the workpiece 60 can be processed. Figure 4As shown, when the second end 22 swings to the right side of the longitudinal axis of the sanding belt shaft 11, the rotating component pulls the sanding belt 12 so that the sanding belt 12 contacts the sanding belt shaft 11 on the left semicircular surface of the sanding belt shaft 11, so that the left inner arc surface 61 of the workpiece 60 can be machined. Therefore, both the left and right inner arc surfaces can be machined smoothly, and even the inner arc surface with undercuts can be machined in place.

[0026] Furthermore, the rotating shaft 23 and the sanding belt shaft 11 are on the same straight line in the longitudinal direction, that is, the rotating shaft 23 is located directly above the sanding belt shaft 11. This allows for symmetrical left-right processing via the sanding belt during oscillation. Of course, in cases where the left and right inner curved surfaces are asymmetrical, such as when the right inner curved surface does not have an undercut, the left oscillation amplitude can be reduced. In this case, the rotating shaft 23 can be positioned slightly to the left of the axis of the sanding belt shaft 11, meaning that the rotating shaft 23 and the sanding belt shaft 11 do not necessarily have to be on the same straight line.

[0027] In addition, the frame 101 is also provided with a tooling table 50 for mounting the workpiece 60, preferably a magnetically controlled tooling table. The frame 101 is also provided with a sanding belt motor 15 and a drive wheel 16. The drive wheel 16 and the sanding belt shaft 11 are fitted with the belt 12, thereby driving the sanding belt to rotate and causing the sanding belt 12 to grind the workpiece 60.

[0028] In the aforementioned bidirectional belt angle changing device and belt grinding machine 100, the rotating arm 20 is driven to rotate by the drive mechanism 30, and the second end of the rotating arm 20 also rotates accordingly. The rotating component then pulls the abrasive belt 12 to change its angle, altering the contact position between the abrasive belt 12 and the abrasive belt shaft 11. This allows for the processing of the left and right inner arc surfaces 61 and 62 of the workpiece 60. This avoids interference with the abrasive belt 12, facilitating the grinding of the left and right inner arc surfaces. Simultaneously, it reduces complex and cumbersome programming, enabling the processing of complex inner arc undercut surfaces using only two axes. The entire device can achieve the above functions simply by adding the rotating arm 20 and the drive mechanism 30 (such as a cylinder). The structure is ingenious, and the cylinder is easy to operate and can be controlled using mature programming, showing promising application prospects.

[0029] It should be noted that the present invention is not limited to the above-described embodiments. Based on the inventive spirit of the present invention, those skilled in the art can make other changes, and these changes made in accordance with the inventive spirit of the present invention should be included within the scope of protection claimed by the present invention.

Claims

1. A device for changing the angle of a belt in two directions for a belt grinder for processing a surface with an inner arc reverse curve, said belt grinder comprising a frame, a belt shaft mounted on the frame, a belt mounted on the belt shaft for processing, characterized in that, The bidirectional sand belt angle changing device comprises a rotating arm, a driving mechanism for driving the rotating arm to rotate, the rotating arm is installed on a frame through a rotating shaft, the rotating arm has a first end and a second end, an output shaft of the driving mechanism acts on the first end of the rotating arm, the second end is provided with a rotating part for changing the sand belt angle to change the contact position of the sand belt with the sand belt shaft under the driving of the driving mechanism, the rotating part comprises three rotating shafts, namely a first rotating shaft, a second rotating shaft and a third rotating shaft, the sand belt is divided into a feeding section and a rotating section, the feeding section of the sand belt passes between the first rotating shaft and the second rotating shaft, the rotating section of the sand belt passes between the second rotating shaft and the third rotating shaft, the second rotating shaft is located between the first rotating shaft and the third rotating shaft, the second rotating shaft is closer to the sand belt shaft than the first rotating shaft and the third rotating shaft, the three rotating shafts are arranged in a straight line or a triangle, the first rotating shaft and the third rotating shaft are symmetrically arranged with the second rotating shaft as the center, the first end and the second end are respectively located at two ends of the rotating shaft, the second end can swing around the rotating shaft under the driving of the driving mechanism, the second end swings around the longitudinal axis of the sand belt shaft, the driving mechanism has a predetermined driving stroke to enable the second end to swing from the left side of the longitudinal axis of the sand belt shaft to the right side, when the second end swings to the left side of the longitudinal axis of the sand belt shaft, the rotating part drags the sand belt to make the sand belt contact the right half circumferential surface of the sand belt shaft to process the right inner arc surface of the workpiece, when the second end swings to the right side of the longitudinal axis of the sand belt shaft, the rotating part drags the sand belt to make the sand belt contact the left half circumferential surface of the sand belt shaft to process the left inner arc surface of the workpiece.

2. The apparatus of claim 1, wherein, The rotating part has an outer circumferential surface to contact the sand belt, and the rotating part is a cylindrical body.

3. The apparatus of claim 1, wherein, The driving mechanism is movably installed on a bearing frame, the driving mechanism is a pneumatic cylinder, and the bearing frame is installed on the frame.

4. The apparatus of claim 1, wherein, A bearing frame is installed on the frame, and the driving mechanism is movably suspended on the frame or the bearing frame.

5. The apparatus of claim 3, wherein, The pneumatic cylinder is provided with a connecting ring at the rear end away from the output shaft, the bearing frame is provided with a fixing ring, and the connecting ring is buckled on the fixing ring.

6. The apparatus of claim 1, wherein, The rotating shaft and the sand belt shaft are in the same straight line in the longitudinal direction.

7. A belt sander comprising a frame, a belt shaft mounted on the frame, and a belt for processing mounted on the belt shaft, characterized in that, The bidirectional sand belt angle changing device according to any one of claims 1-6 is also included.

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