A belt sander

Abstract

The application relates to a belt sander, which comprises front and rear axial driving wheels rotationally connected to the upper end of the left side of a bottom plate, front and rear axial tensioning wheels rotationally connected to the upper and lower ends of the right side of the bottom plate, a driving motor coaxially fixedly connected to one side of the driving wheel, a sand belt arranged around the outer side of the driving wheel and connected at the head and tail, an installation ring arranged between the two tensioning wheels, the upper and lower ends of the installation ring rotationally connected to the tensioning wheels through supporting rods, a limiting mechanism rotationally connected to the relatively lower supporting rod, and the limiting mechanism slidingly connected to the bottom plate. In actual use, the two tensioning wheels are moved to change the inclination angle of the vertical section of the sand belt, the center axis of the installation ring is arranged on the same horizontal plane as the supporting table, and the sand belt can be used in actual processing to change the grinding angle.

Description

Technical Field

[0001] This invention relates to the field of belt sander technology, specifically to a belt sander. Background Technology

[0002] Belt sanders are widely used for grinding the surfaces of various parts made of metal, non-ferrous metals and non-metals.

[0003] Essentially, belt sanders rely on the cooperation of drive wheels and tension wheels. By sliding the tension wheel, the distance between the drive wheel and the tension wheel is changed, ensuring that the sanding belt, which is set around the outside of the drive wheel and the tension wheel, can fully and tightly fit with the drive wheel and the tension wheel. In practice, the frictional resistance is used to drive the sanding belt to rotate and achieve the grinding process.

[0004] Existing simplified belt sanders typically have a drive wheel on one side of the base, and tensioning wheels at the top and bottom of the other side. The sanding belt is then wrapped around the outside of the drive wheel and tensioning wheels. This design is simple to install, has reliable structural components, and allows the sanding belt to form a vertical section between the two tensioning wheels. Utilizing this vertical section of the sanding belt to grind the workpiece better meets actual processing needs.

[0005] However, due to its overly simple structure, the vertical section of the abrasive belt cannot change its angle and always remains vertical. This means that when grinding bevels or grinding bevels, the operator generally needs to add a support plate under the workpiece and manually control the workpiece's tilt angle. This is not only unsafe but also cannot guarantee machining accuracy. Therefore, we believe that a simplified belt sander that can adjust the tilt angle of the vertical section of the abrasive belt is needed.

[0006] Content of this invention

[0007] To address the shortcomings of existing technologies, this invention proposes a belt sander that features a simple structure, high reliability, and the ability to change the tilt angle of the vertical section of the sander belt, thus overcoming the limitation of existing simplified devices that cannot adjust the tilt angle of the vertical section of the sander belt.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A belt sander includes a base plate. A drive wheel with a front-to-back axial direction is rotatably connected to the upper left side of the base plate. A drive motor is coaxially fixedly connected to one side of the drive wheel and movably connected to the base plate. Tensioning wheels with a front-to-back axial direction are rotatably connected to the upper and lower ends of the right side of the base plate, respectively. A sanding belt connected end-to-end is arranged around the tensioning wheels and the drive wheel. A mounting ring is rotatably connected to the upper right side of the base plate. A support rod is fixedly connected to the upper and lower ends of the mounting ring, respectively. The central axes of the two support rods coincide. The far ends of the two support rods are rotatably connected to the two tensioning wheels, respectively. A limiting mechanism is rotatably connected to the lower support rod and movably connected to the base plate. A support platform is also fixedly connected to the base plate. The upper surface of the support platform is at the same horizontal plane as the central axis of the mounting ring.

[0010] Preferably, a left-right axial push rod is provided between the tensioning wheel and the mounting ring. One end of the push rod abuts against the mounting ring, and the other end of the push rod abuts against an adjusting block. The adjusting block has a U-shaped cross-section, and the mounting ring is embedded in the U-shaped structure of the adjusting block. The mounting ring and the adjusting block are fixedly connected. The end face of the adjusting block near the tensioning wheel is an inclined surface, and the lengths of the upper and lower ends of the adjusting block are greater than the length of the middle of the adjusting block. A slide rail is fixedly connected to the base plate by an L-shaped plate. The longitudinal section of the drive motor is a rounded rectangle, and the drive motor and the drive wheel are inserted into the slide rail.

[0011] Preferably, a compression spring with a left-right axis is fixedly connected to the upper end of the L-shaped plate, and a balance plate is fixedly connected to the other axial end of the compression spring. The center point of the balance plate is located on the extension line of the central axis of the compression spring, and the front and rear ends of the balance plate abut against the drive motor and the drive wheel, respectively.

[0012] Preferably, the limiting mechanism includes a rack with a groove at the lower end of the rack, a slide plate slidably connected in the groove, and the front and rear ends of the slide plate being fixedly connected to the base plate through a U-shaped plate. The upper end of the rack is meshed with a drive gear in the front and rear axial directions, and the drive gear is rotatably connected to the U-shaped plate through a connecting plate. A handle is fixedly connected to the front end face of the drive gear.

[0013] Preferably, a pawl is provided on each of the left and right sides of the upper end of the drive gear. The pawl is rotatably connected to the connecting plate through a pin. A pressing plate is fixedly connected to the left end of the pawl. The pin and the connecting plate are interference-fitted.

[0014] Preferably, the front end face of the rack is etched with scale lines, which correspond to the angle between the central axis of the support rod and the vertical plane.

[0015] Preferably, each of the two tensioning wheels has a mounting block near its end, and a rotating groove is formed at the middle of the two mounting blocks at their far ends. The tensioning wheel is inserted into the rotating groove. A limiting ring I is fixedly connected to the front and rear end faces of the tensioning wheel, and a limiting ring II is fixedly connected to the front and rear ends of the mounting groove. The distance between the near ends of the two limiting rings II in each mounting block is greater than the thickness of the tensioning wheel and less than the distance between the far ends of the two limiting rings on each tensioning wheel.

[0016] Preferably, each of the limiting rings II has an installation groove at the end facing the rotation groove and at the end facing the limiting ring II, and a ball is embedded in the installation groove, with the ball abutting against the limiting ring.

[0017] Preferably, the support rod includes two screws with coincident central axes, and the two screws are screwed together by an internally threaded tube, and the thread directions of the two screws in each support rod are completely opposite.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] This invention changes the inclination angle of the vertical section of the abrasive belt by moving two tensioning wheels, and ensures that the central axis of the mounting ring is on the same horizontal plane as the support platform, thus enabling the adjustment of the grinding angle during actual processing.

[0020] This invention controls the movement of the tensioning wheel through a sliding limiting mechanism to achieve the rotation of the mounting ring. This allows for precise adjustment of the mounting ring's rotation angle by utilizing the relatively long movement distance of the limiting mechanism corresponding to a smaller rotation angle of the mounting ring, while avoiding excessive reaction force and effectively limiting the mounting ring. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the fit between the push rod and the drive wheel of the present invention;

[0023] Figure 3 This is a schematic diagram of the drive motor and slide rail of the present invention.

[0024] Figure 4 This is a schematic diagram of the compression spring and balance plate of the present invention.

[0025] Figure 5 This is a schematic diagram showing the connection between the tensioner wheel and the mounting block of the present invention;

[0026] Figure 6 This is a schematic diagram of the mounting ring and support rod of the present invention.

[0027] Figure 7 This is a schematic diagram of the rack and gear connection of the present invention;

[0028] Figure 8 This is a schematic diagram of the connection plate and the U-shaped plate of the present invention.

[0029] In the diagram: 1. Drive wheel; 2. Tensioner wheel; 3. Sanding belt; 4. Base plate; 5. Support platform; 6. Limiting mechanism; 601. Handle; 602. Drive gear; 603. Pawl; 604. Pressing plate; 605. Rack; 606. Slide groove; 607. U-shaped plate; 608. Connecting plate; 7. Mounting ring; 8. Top rod; 9. Adjusting block; 10. Drive motor; 11. Compression spring; 12. L-shaped plate; 13. Slide rail; 14. Balance plate; 15. Limiting ring I; 16. Limiting ring II; 17. Mounting block; 18. Ball bearing; 19. Support rod; 1901. Screw; 1902. Internally threaded tube. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] Please refer to Figure 1-8 A belt sander includes a drive wheel 1 and a tension wheel 2. The drive wheel 1 and tension wheel 2 work together to allow the sanding belt 3 to wrap around and be interference-fitted with the outer sides of the drive wheel 1 and tension wheel 2. This allows the drive wheel 1 to be driven by frictional resistance, which in turn drives the sanding belt 3 to rotate via a drive motor 10. The drive motor 10 is coaxially fixedly connected to one side of the drive wheel 1.

[0033] A base plate 4 is also provided below the drive wheel 1 to support the drive wheel 1 and the tension wheel 2.

[0034] There should be two tensioning rollers 2, so that the sanding belt 3 has a vertical section when the two tensioning rollers 2 are set up one above the other, which is in line with daily processing habits.

[0035] A mounting ring 7 is rotatably connected to the upper end of the base plate 4. The upper and lower ends of the mounting ring 7 are rotatably connected to the tensioning wheel 2 through the support rod 19. By rotating the mounting ring 7, the angle between the central axis of the two tensioning wheels 2 and the vertical plane can be driven, thereby changing the vertical angle of the sanding belt 3, so that the user can use the sanding belt 3 to grind bevels at different angles.

[0036] Specifically, the support rod 19 and the tension wheel 2 are rotatably connected by the mounting block 17, and the mounting block 17 is fixedly connected to the support rod 19.

[0037] Rotating grooves are provided at the middle position of the two mounting blocks 17 at their far ends, and tensioning wheel 2 is embedded in the rotating grooves.

[0038] A limiting ring I15 is fixedly connected to the front and rear end faces of the tensioning wheel 2, and a limiting ring II16 is fixedly connected to the front and rear ends of the mounting groove. That is, the limiting ring II16 in each rotating groove is located on the side away from the two limiting rings I15. In practice, by constraining the diameter and thickness of the limiting rings I15 and II16, the distance between the near ends of the two limiting rings II16 in each mounting block 17 is greater than the thickness of the tensioning wheel 2 and less than the distance between the far ends of the two limiting rings on each tensioning wheel 2. This helps to limit the tensioning wheel 2, so that it can only rotate relative to the mounting block 17 and cannot move relative to the mounting block 17.

[0039] Furthermore, each limiting ring II 16 has an installation groove at one end facing the rotating groove and at the other end facing the limiting ring II 16. A ball 18 is embedded in the installation groove and abuts against the limiting ring. That is, the upper end of the limiting ring I 15 and the lower end of the tensioning wheel 2 abut against the ball 18 respectively. The ball 18 can reduce the contact area and reduce the frictional resistance encountered by the tensioning wheel 2 during rotation, thereby ensuring that the drive wheel 1 can drive the sanding belt 3 to rotate.

[0040] Specifically, the support rod 19 includes two screws 1901 with their central axes coinciding. The two screws 1901 are connected together by an internally threaded tube 1902. Furthermore, the thread directions of the two screws 1901 in each support rod 19 are completely opposite, so that when the user rotates the internally threaded tube 1902, the two screws 1901 can move in opposite directions to change the relative length of the support rod 19. This not only facilitates the initial installation process of the sanding belt 3 on the tensioning wheel 2 and the drive wheel 1, but also ensures that the sanding belt 3 and the drive wheel 1 are tightly fitted and have sufficient friction by adjusting the length of the support rod 19.

[0041] Specifically, the mounting ring 7 can be rotatably connected to the base plate 4 via a bearing. This restricts the distance between the mounting ring 7 and the base plate 4, ensuring that the mounting ring 7 does not move relative to the base plate 4. This allows the support platform 5, which is fixedly connected to the base plate 4, to always be on the same horizontal plane as the central axis of the mounting ring 7. This ensures that even if the tilt angle of the horizontal end of the sanding belt 3 changes, the distance between the sanding belt 3 and the support platform 5 remains as unchanged as possible.

[0042] Meanwhile, when the two tensioning wheels 2 are rotated around the center of the mounting ring 7, causing the angle of the vertical section of the sanding belt 3 to change, the relative distance between the two tensioning wheels 2 in the vertical direction decreases and the relative distance between the two tensioning wheels 2 in the horizontal direction increases. Combined with the position of the drive wheel 1, if the position of the drive wheel 1 is not changed, the sanding belt 3 will not be able to guarantee a tight fit with the drive wheel 1.

[0043] In order to change the position of the drive wheel 1, the device has a slide rail 13 fixedly connected to the base plate 4 by an L-shaped plate 12. The drive motor 10 and the drive wheel 1 are inserted into the slide rail 13, so that the drive motor 10 and the drive wheel 1 can move left and right linearly relative to the slide rail 13, thereby changing the position of the drive wheel 1 and the drive motor 10.

[0044] The longitudinal section of the drive motor 10 is a rounded rectangle, which utilizes the rectangular characteristics to ensure that the drive motor 10 cannot rotate within the slide rail 13, so that the drive motor 10 can drive the drive wheel 1 to rotate.

[0045] A left-right axial push rod 8 is provided between the drive wheel 1 and the mounting ring 7, as shown in the figure. The push rod 8 is slidably connected to the base plate 4 to limit the position of the push rod 8.

[0046] Since a left-right axial compression spring 11 is fixedly connected to the upper end of the L-shaped plate 12, the compression spring 11 can force the drive motor 10 and the drive wheel 1 to have a tendency to move to the right.

[0047] Therefore, one end of the push rod 8 abuts against the drive wheel 1, and the other end of the push rod 8 can abut against an adjusting block 9.

[0048] The adjusting block 9 has a U-shaped cross-section, and the mounting ring 7 is embedded in the U-shaped structure of the adjusting block 9. The mounting ring 7 is fixedly connected to the adjusting block 9. Therefore, when the mounting ring 7 rotates, it can drive the adjusting block 9 to rotate synchronously.

[0049] The end face of the adjusting block 9 near the tensioning wheel 2 is inclined. The length of the upper and lower ends of the adjusting block 9 is greater than the length of the middle part of the adjusting block 9. Therefore, the difference in length can be used to force the push rod 8 to move to the left during the rotation of the adjusting block 9, thereby increasing the distance between the drive wheel 1 and the mounting ring 7 and ensuring that the sanding belt 3 can be in close contact with the drive wheel 1.

[0050] Furthermore, a balance plate 14 is fixedly connected to the other axial end of the compression spring 11, and the center point of the balance plate 14 is located on the extension line of the central axis of the compression spring 11. The front and rear ends of the balance plate 14 abut against the drive motor 10 and the drive wheel 1, respectively. The balance plate 14 can ensure that the drive motor 10 and the drive wheel 1 are subjected to balanced forces. At the same time, combined with the pressure of the sand belt 3 on the drive wheel 1, it can ensure that the drive motor 10 and the drive wheel 1 will not twist within the slide rail 13.

[0051] Specifically, this device controls the two tensioning wheels 2 to twist around the mounting ring 7 in the following way:

[0052] A limiting mechanism 6 is rotatably connected to the lower support rod 19, and the limiting mechanism 6 is slidably connected to the base plate 4. By controlling the limiting mechanism 6 to move left and right linearly relative to the base plate 4, the lower support rod 19 is pulled, so that the two tensioning wheels 2 can rotate around the mounting ring 7.

[0053] Specifically, the limiting mechanism 6 includes a rack 605, with a groove 606 at the lower end of the rack 605. A sliding plate is slidably connected in the groove 606. The front and rear ends of the sliding plate are respectively fixedly connected to the base plate 4 through a U-shaped plate 607. Thus, the rack 605 is rotatably connected to the support rod 19, and the sliding rack 605 drives the relatively lower support rod 19 to move.

[0054] The upper end of the rack 605 is meshed with a drive gear 602 in the front and rear axial directions. When the position of the drive gear 602 does not change, the rotation of the drive gear 602 will drive the rack 605 to move in a straight line from left to right relative to the base plate 4.

[0055] The drive gear 602 is rotatably connected to the U-shaped plate 607 via the connecting plate 608, thereby limiting the drive gear 602 and ensuring that it does not move relative to the plate.

[0056] A handle 601 is fixedly connected to the front end face of the drive gear 602 to facilitate the rotation of the drive gear 602.

[0057] A pawl 603 is provided on each of the left and right sides of the upper end of the drive gear 602. Utilizing the structure of the pawl 603 and the rotational characteristics of the drive gear 602, it is ensured that the drive gear 602 can only move in one direction under the action of the pawl 603. In practice, the rotational direction of the drive gear 602 can be controlled by changing the pawl 603 embedded in the teeth of the drive gear 602.

[0058] The pawl 603 is rotatably connected to the connecting plate 608 via a pin, which ensures that the positions of the pawl 603 and the drive gear 602 do not change.

[0059] The pin and the connecting plate 608 are interference-fitted, so that the pawl 603 embedded in the teeth of the drive gear 602 can be controlled by the frictional resistance.

[0060] Furthermore, the front end face of the rack 605 is etched with scale lines. Since the moving length of the rack 605 corresponds to the rotation angle of the support rod 19, the scale lines can directly correspond to the angle between the central axis of the support rod 19 and the vertical plane. Specifically, the 0 scale line can correspond to the position of the slide plate or the drive gear 602.

[0061] Specifically, a U-shaped frame is fixedly connected to the rack 605 near the support rod 19. A rotating plate is connected to the U-shaped opening of the U-shaped frame through axial rotation. The rotating plate is slidably connected to the support rod 19 through a collar.

[0062] In practical use, this invention:

[0063] First, based on the rotation angle of the central axis of the support rod 19, rotate the corresponding position pawl 603 so that it engages in the teeth of the drive gear 602;

[0064] Then, the drive gear 602 is rotated. At this time, the rack 605 moves in a straight line relative to the base plate 4, and the central axis of the support rod 19 is deflected.

[0065] Then, when the angle value corresponding to the scale line on the rack 605 matches the expected angle value, the drive gear 602 stops rotating. At this time, the deflection angle value of the support rod 19 meets the requirements. At this time, the adjusting block 9 pushes the push rod 8, which drives the drive wheel 1 to move to the left.

[0066] Finally, the drive motor 10 is turned on, and the sanding belt 3 begins to rotate under the action of the drive wheel 1.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A belt sander characterized by: Includes a base plate (4), with a drive wheel (1) rotatably connected to the upper left side of the base plate (4) along the front and rear axes, and a drive motor (10) coaxially fixedly connected to one side of the drive wheel (1), and the drive motor (10) is movably connected to the base plate (4); The bottom plate (4) has tensioning wheels (2) rotatably connected to the upper and lower ends of its right side, with the tensioning wheels (2) connected to the drive shaft. The outer side of the wheel (1) is surrounded by a sand belt (3) that is connected end to end; The upper right side of the base plate (4) is rotatably connected to an installation ring (7). The upper and lower ends of the installation ring (7) are respectively fixedly connected to a support rod (19). The central axes of the two support rods (19) coincide, and the far ends of the two support rods (19) are respectively rotatably connected to two tensioning wheels (2). A limiting mechanism (6) is rotatably connected to the lower support rod (19), and the limiting mechanism (6) is movably connected to the base plate (4); A support platform (5) is also fixedly connected to the base plate (4), and the upper end face of the support platform (5) is at the same horizontal plane as the central axis of the mounting ring (7); A left-right axial push rod (8) is provided between the drive wheel (1) and the mounting ring (7). One end of the push rod (8) abuts against the drive wheel (1), and the other end of the push rod (8) abuts against an adjusting block (9). The cross-section of the adjusting block (9) is U-shaped, and the mounting ring (7) is embedded in the U-shaped structure of the adjusting block (9), and the mounting ring (7) is fixedly connected to the adjusting block (9); The end face of the adjusting block (9) that abuts against the top rod (8) forms a V-shaped inclined surface. Specifically, the end face is a V-shaped concave in the middle in the vertical direction, so that the upper and lower ends of the end face protrude more towards the drive wheel (1) than the middle part. The base plate (4) is fixedly connected to the slide rail (13) by the L-shaped plate (12). The longitudinal section of the drive motor (10) is a rounded rectangle. The drive motor (10) and the drive wheel (1) are inserted into the slide rail (13). The limiting mechanism (6) includes a rack (605), and a groove (606) is provided at the lower end of the rack (605). A sliding plate is slidably connected in the groove (606), and the front and rear ends of the sliding plate are respectively fixedly connected to the base plate (4) through a U-shaped plate (607). The upper end of the rack (605) is meshed with a drive gear (602) in the front and rear axial directions. The drive gear (602) is rotatably connected to the U-shaped plate (607) through the connecting plate (608). A handle (601) is fixedly connected to the front end face of the drive gear (602). The drive gear (602) is provided with a pawl (603) on the left and right sides of the upper end. The pawl (603) is rotatably connected to the connecting plate (608) through a pin. A pressing plate (604) is fixedly connected to the left end of the pawl (603). The pin and the connecting plate (608) are interference fit. The front end face of the rack (605) is etched with scale lines, which correspond to the angle between the central axis of the support rod (19) and the vertical plane.

2. The belt sander according to claim 1, characterized in that: The upper end of the L-shaped plate (12) is fixedly connected to a compression spring (11) with a left-right axis, and the other axial end of the compression spring (11) is fixedly connected to a balance plate (14). The center point of the balance plate (14) is located on the extension line of the central axis of the compression spring (11). The front and rear ends of the balance plate (14) are respectively in contact with the drive motor (10) and the drive wheel (1).

3. A belt sander according to claim 1, characterized in that: Two tensioning wheels (2) are respectively provided with a mounting block (17) near the end, and a rotating groove is provided at the middle position of the two mounting blocks (17) away from the end, and the tensioning wheel (2) is inserted into the rotating groove; A limiting ring I (15) is fixedly connected to the front and rear end faces of the tensioning wheel (2), and a limiting ring II (16) is fixedly connected to the front and rear ends of the rotating groove. The distance between the near ends of the two limiting rings II (16) in each mounting block (17) is greater than the thickness of the tensioning wheel (2) and less than the distance between the far ends of the two limiting rings I (15) on each tensioning wheel (2).

4. A belt sander according to claim 3, characterized in that: Each of the aforementioned limiting rings II (16) has a mounting groove at one end facing the rotation groove and at the other end of the rotation groove facing the limiting rings II (16), and a ball bearing (18) is embedded in the mounting groove. The ball (18) abuts against the limiting ring I (15) and the limiting ring II (16).

5. A belt sander according to claim 1, characterized in that: The support rod (19) includes two screws (1901) with their central axes coincident. The two screws (1901) are connected together by an internally threaded tube (1902). Furthermore, the thread directions of the two screws (1901) in each support rod (19) are completely opposite.

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