A grinding device for bicycle frame

Abstract

The present invention relates to the field of grinding technology, and specifically to a grinding device for a bicycle frame, comprising a frame, a driving wheel, a sanding belt, a mounting tube, a clamping device, and a damping device; the sanding belt is in a ring shape that is connected end to end and surrounds a circle; the front wheel, the upper wheel, and the lower wheel are in the circle surrounded by the sanding belt, and the driving wheel is outside the circle surrounded by the sanding belt. The front wheel, the upper wheel, the lower wheel, and the driving wheel support and tension the sanding belt, and the sanding belt parts on the upper and lower sides of the driving wheel form a processing gap. When the sanding belt rotates, the sanding belts on the upper and lower sides of the driving wheel move in opposite directions, so that the sanding forces of the sanding belt parts on the upper and lower sides of the driving wheel on the workpiece during the grinding process offset each other, making the workpiece more stable during grinding. At the same time, the sanding belts on the upper and lower sides of the driving wheel move in opposite directions to drive the workpiece to rotate, and the damping device provides rotational resistance for the rotation of the clamping disk, so that the linear speed at the surface of the workpiece is less than the sanding belt moving speed, so as to achieve grinding of the entire surface of the workpiece and improve the grinding effect.

Description

Technical Field

[0001] The invention relates to the technical field of grinding, and in particular to a grinding device for a bicycle frame. Background Art

[0002] A grinding and polishing machine is a processing equipment that reduces the surface roughness of a workpiece to obtain a bright and smooth surface. A grinding and polishing machine uses polishing tools and abrasive particles or other polishing media to modify the surface of a workpiece. A belt grinder is a type of grinder and is also a commonly used mechanical processing equipment specifically for grinding the surface of metal products such as steel and copper or pipe workpieces. A belt grinder is often used in the processing of bicycle frames.

[0003] In the prior art, for example, in a Chinese patent application with publication number CN114227470A, entitled A Belt Polisher, the disclosed technical solution states that a polishing support plate is provided on the polishing machine body, and clamping mechanisms are provided on the left and right sides of the polishing support plate, and the clamping mechanisms firmly clamp the workpiece on the belt polisher for polishing. However, when the belt is polishing the workpiece, the grinding force of the belt on the workpiece causes the clamping mechanism to be subjected to a large reaction force, and after a period of use, the clamping mechanism may cause inaccurate positioning of the workpiece after a period of use, thereby affecting the polishing effect. Summary of the invention

[0004] The present invention provides a grinding device for a bicycle frame to solve the above problems.

[0005] A grinding device for a bicycle frame of the present invention adopts the following technical scheme: a grinding device for a bicycle frame comprises a frame, a driving wheel, a sanding belt, a mounting cylinder, a clamping device, and a damping device; the frame is arranged front and rear; the axis of the driving wheel is arranged horizontally left and right; the driving wheel is rotatably mounted on the frame; a front wheel is arranged on the front side of the driving wheel; the front wheel is arranged left and right; the front wheel is rotatably mounted on the frame; the diameter of the front wheel is larger than that of the driving wheel; a slide groove is arranged at the rear end of the frame; the slide groove is an arc groove extending up and down; and the center of the slide groove falls on the axis of the driving wheel; an upper shaft is arranged at the rear side of the driving wheel; the upper shaft is arranged left and right; the upper shaft is slidably mounted in the slide groove; initially, the upper shaft is at the upper end of the slide groove; an upper wheel is coaxially rotatably mounted on the upper shaft; a lower shaft is arranged below the upper wheel; the lower shaft is arranged at the rear side of the driving wheel; the lower shaft is arranged left and right; the lower shaft is fixed to the frame; and the lower wheel is rotatably mounted on the lower shaft.

[0006] The abrasive belt is in the shape of a circle connected end to end. The abrasive belt passed by the upper wheel passes by the front side of the driving wheel and is then wound around the lower wheel, so that the abrasive belt forms a processing gap on the upper and lower sides of the driving wheel. Initially, the processing gap is in the shape of a V with the small end facing forward. When the workpiece needs to be polished, the upper shaft is driven along the slide groove to approach the lower shaft, and the upper wheel drives the abrasive belt part above the driving wheel to swing downward around the axis of the driving wheel, so that the processing gap is in the shape of a V with the small end facing backward. The V-shaped processing gap can adapt to workpieces of different diameters. The larger the diameter of the workpiece, the closer the workpiece is to the driving wheel.

[0007] Two installation cylinders are arranged, which are distributed on both sides of the abrasive belt and arranged in the processing gap; the installation cylinders are arranged on the left and right sides; a clamping disk is rotatably installed at one end of the installation cylinder close to the abrasive belt.

[0008] The clamping device is used to support the installation cylinder in the processing gap, and when the processing gap is in a V shape with the small end facing backwards, the installation cylinder is driven to move the workpiece backwards through the clamping disk, so that the upper and lower ends of the workpiece abut against the abrasive belt.

[0009] The damping device is arranged between the mounting cylinder and the clamping disk; when the abrasive belt rotates, the abrasive belts on the upper and lower sides of the driving wheel move in opposite directions, so that the grinding forces of the abrasive belts on the upper and lower sides of the driving wheel acting on the workpiece cancel each other out during the grinding process, making the workpiece more stable during grinding. At the same time, the abrasive belts on the upper and lower sides of the driving wheel move in opposite directions to drive the workpiece to rotate, and the damping device provides rotational resistance for the rotation of the clamping disk, so that the linear speed at the workpiece surface is less than the moving speed of the abrasive belt, thereby achieving grinding of the entire surface of the workpiece and improving the grinding effect.

[0010] Furthermore, two clamping devices are provided, which are distributed on both sides of the sanding belt on the left and right; the clamping device includes two swing arms; the two swing arms are symmetrically distributed on the upper and lower sides of the mounting tube, and are in a V shape with the small end facing the mounting tube; the swing arm is a sleeve-type telescopic rod; the swing arm includes a mother arm and a child arm; the mother arm is arranged away from the mounting tube; the mother arm is a sleeve; the child arm is slidably inserted in the mother arm; an adjusting spring is fixedly connected between the mother arm and the child arm; the upper end of the child arm of the lower swing arm and the mounting tube are rotatably and slidably matched, and the lower end of the mother arm of the lower swing arm and the lower shaft are rotatably and slidably matched; the upper end of the mother arm of the upper swing arm and the upper shaft are rotatably and slidably matched, and the lower end of the child arm of the upper swing arm and the mounting tube are rotatably and slidably matched; a connecting rod is fixedly connected between the upper ends of the upper swing arms of the two clamping devices; the connecting rod is a telescopic rod, and the length is locked by bolts.

[0011] Auxiliary components are provided between the mother arm and the sub-arm; in the initial state, the sub-arm extends out of the mother arm, and the auxiliary components limit the relative movement of the mother arm and the sub-arm so that the adjusting spring is stretched and stores force. When the upper shaft approaches the lower shaft along the slide groove, the upper wheel drives the sanding belt part above the driving wheel to swing downward around the axis of the driving wheel, so that the processing gap is in a V shape with the small end facing backward, and the sliding restriction between the mother arm and the sub-arm is released, so that the adjusting spring releases force and contracts, and the sub-arm drives the mounting cylinder to move backward, so that the upper and lower ends of the workpiece are in contact with the sanding belt. The V-shaped processing gap can adapt to workpieces of different diameters. The larger the diameter of the workpiece, the closer the workpiece is to the driving wheel.

[0012] Furthermore, the auxiliary component includes a mother hole, a sub-hole, and an auxiliary rod; the mother hole is a through hole arranged on the side wall of the angular bisector of the V-shaped angle of the mother arm away from the two swing arms of the same clamping device; the sub-hole is arranged on the side wall of the angular bisector of the V-shaped angle of the sub-arm away from the two swing arms of the same clamping device; the auxiliary rod is perpendicular to the corresponding mother arm; the auxiliary rod is slidably installed on the mother arm along the direction perpendicular to the mother arm; one end of the auxiliary rod away from the angular bisector of the V-shaped angle of the two swing arms of the same clamping device is fixed with a clamping column through a transverse connecting rod; the axis of the clamping column is parallel to the auxiliary rod; one end of the auxiliary rod close to the angular bisector of the V-shaped angle of the two swing arms of the same clamping device extends between the V-shaped angles of the two swing arms of the same clamping device; a reset spring is fixedly connected between one end of the auxiliary rod close to the angular bisector of the V-shaped angle of the two swing arms of the same clamping device and the mother arm; initially, the reset spring causes the clamping column to pass through the mother hole and be inserted into the sub-hole to limit sliding between the mother arm and the sub-arm.

[0013] When the upper shaft approaches the lower shaft along the slide groove, the upper wheel drives the sanding belt part above the driving wheel to swing downward around the axis of the driving wheel, so that the processing gap is in a V shape with the small end facing backward, and the two auxiliary rods on the two swing arms of the same clamping device are close to one end of the angular bisector of the V-shaped angle of the two swing arms of the same clamping device and press against each other, compressing the reset spring, driving the auxiliary rod to drive the clamping column away from the angular bisector of the V-shaped angle of the two swing arms of the same clamping device, so that the clamping column is separated from the sub-hole, and the sliding restriction between the mother arm and the sub-arm is released.

[0014] Furthermore, the damping device includes a friction disk; the friction disk is arranged in the mounting tube and is on the side where the two clamping disks are away from each other; the friction disk and the clamping disk abut against each other and are frictionally matched; the friction disk is axially slidably installed in the mounting tube along the mounting tube; a movable disk is provided on the side of the friction disk away from the clamping disk; the movable disk is axially slidably installed in the mounting tube along the mounting tube; a pressure spring is connected to the movable disk and the friction disk; the pressure spring is in a compressed and force-storing state.

[0015] When the abrasive belt drives the workpiece to rotate, the pressure spring provides pressure for the friction disk to the clamping disk, causing friction resistance between the friction disk and the clamping disk, thereby causing the workpiece surface and the abrasive belt to slide relative to each other, achieving simultaneous self-rotation while grinding the workpiece to achieve grinding in the circumferential direction of the workpiece, thereby improving the grinding effect.

[0016] Furthermore, a fine-tuning assembly is provided on the sub-arm; the fine-tuning assembly is used to adjust the friction resistance between the friction disk and the clamping disk according to the diameter of the workpiece, and the larger the diameter of the workpiece, the greater the friction resistance of the friction disk on the clamping disk. As the diameter of the workpiece increases, the force arm of the grinding force of the abrasive belt on the workpiece increases, making it easier for the workpiece to be driven to rotate by the abrasive belt. Therefore, the friction resistance between the friction disk and the clamping disk is adjusted according to the diameter of the workpiece by the fine-tuning assembly.

[0017] Furthermore, the fine-tuning assembly includes a fine-tuning cam and a fine-tuning plate; the fine-tuning cam is fixed to the end of the movable disk away from the clamping disk; the fine-tuning plate is arranged to be tilted forward and backward, and is arranged along the length direction of the swing arm, and is located on the side of the mounting tube away from the sanding belt; the fine-tuning plate is fixed on the mother arm of the upper swing arm; the side wall of the fine-tuning plate close to the mounting tube is set as a fine-tuning wall; the fine-tuning wall and the fine-tuning cam are abutted; the fine-tuning wall is a wedge-shaped wall; the distance from the end of the fine-tuning wall close to the driving wheel to the clamping disk is smaller than the distance from the end of the fine-tuning wall away from the driving wheel to the clamping disk.

[0018] Since the V-shaped machining gap can adapt to workpieces of different diameters, the larger the workpiece diameter, the closer the workpiece is to the driving wheel. As the workpiece diameter increases, the greater the force arm of the grinding force of the abrasive belt on the workpiece, making it easier for the workpiece to be driven by the abrasive belt to rotate. When the workpiece diameter increases, the mounting cylinder is closer to the driving wheel, the distance from the fine-tuning wall to the clamping disk is smaller, the fine-tuning wall pushes the fine-tuning convex to the clamping disk, and compresses the pressure spring, increasing the friction resistance between the friction disk and the clamping disk, so that the workpiece is always ground at a relatively constant speed, improving the grinding effect.

[0019] Furthermore, an adjustment handle is fixed on the fine-tuning plate. By pulling the adjustment handle left and right, the swing arm is pulled to drive the mounting tube to move left and right, and the grinding part of the workpiece is adjusted to adapt to the grinding of workpieces of different lengths.

[0020] Furthermore, an operating handle is fixed to the end of the upper shaft; a clamping sleeve is threadedly connected to the operating handle. Initially, the clamping sleeve and the frame are clamped to limit the upper shaft at the upper end of the slide slot. Loosen the bolts on the connecting rod, pull the swing arms of the two clamping devices apart, and move the two mounting cylinders away from each other. When the workpiece is placed between the two clamping disks, the connecting rod is contracted to clamp the workpiece between the two clamping disks; tighten the bolts on the connecting rod again to lock the length of the connecting rod. Then loosen the clamping sleeve to disengage the clamping sleeve from the frame, press the upper shaft down by the operating handle, drive the upper shaft to approach the lower shaft along the slide slot, and the upper wheel drives the sanding belt part above the driving wheel to swing downward around the axis of the driving wheel, so that the processing gap is in a V shape with the small end facing backward.

[0021] Furthermore, a motor is fixed on the frame; the output shaft of the motor is fixedly connected to the driving wheel.

[0022] Furthermore, a tensioning wheel is provided in the circle of the sanding belt; the tensioning wheel is provided between the upper wheel and the driving wheel, and is above the driving wheel; a tensioning plate is rotatably mounted on the tensioning wheel; the tensioning plate and the frame are hinged around a horizontal axis; a torsion spring is connected at the hinge between the tensioning plate and the frame; the torsion spring makes the upper end of the tensioning wheel abut against the sanding belt, and tensions the sanding belt.

[0023] The beneficial effects of the present invention are:

[0024] 1. When the abrasive belt rotates, the abrasive belts on the upper and lower sides of the driving wheel move in opposite directions, so that the grinding forces of the abrasive belts on the upper and lower sides of the driving wheel on the workpiece cancel each other out during the grinding process, making the workpiece more stable during grinding. At the same time, the abrasive belts on the upper and lower sides of the driving wheel move in opposite directions to drive the workpiece to rotate, and the damping device provides rotational resistance for the rotation of the clamping disk, so that the linear speed at the workpiece surface is less than the moving speed of the abrasive belt, thereby achieving grinding of the entire surface of the workpiece and improving the grinding effect.

[0025] 2. Since the V-shaped machining gap can adapt to workpieces of different diameters, the larger the workpiece diameter, the closer the workpiece is to the driving wheel. As the workpiece diameter increases, the greater the force arm of the grinding force of the abrasive belt on the workpiece, making it easier for the workpiece to be driven by the abrasive belt to rotate. When the workpiece diameter increases, the mounting tube is closer to the driving wheel, the distance from the fine-tuning wall to the clamping disk is smaller, the fine-tuning wall pushes the fine-tuning convex to the clamping disk, and compresses the pressure spring, increasing the friction resistance between the friction disk and the clamping disk, so that the workpiece is always ground at a relatively constant speed, improving the grinding effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 It is a structural schematic diagram of an embodiment of a grinding device for a bicycle frame of the present invention;

[0028] Figure 2 A top view of an embodiment of a grinding device for a bicycle frame of the present invention;

[0029] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0030] Figure 4 A side view of an embodiment of a grinding device for a bicycle frame of the present invention;

[0031] Figure 5A state diagram of an embodiment of a grinding device for a bicycle frame of the present invention when the upper shaft is at the lower end of a slide groove;

[0032] Figure 6 for Figure 5 Enlarged view of point C in the middle;

[0033] Figure 7 for Figure 5 Sectional view at the middle BB;

[0034] Figure 8 for Figure 7 The enlarged view of point D in the middle;

[0035] Fig. 9 An exploded view of a clamping device of an embodiment of a grinding device for a bicycle frame of the present invention;

[0036] Fig.10 for Fig. 9 Enlarged view of point E in the middle;

[0037] Fig.11 The present invention is a schematic diagram of a fine-tuning plate and a female arm of an embodiment of a grinding device for a bicycle frame of the present invention.

[0038] In the figure: 100, frame; 110, slide; 200, driving wheel; 210, front wheel; 220, upper shaft; 221, upper wheel; 222, operating handle; 230, lower shaft; 231, lower wheel; 240, tensioning wheel; 300, abrasive belt; 310, machining gap; 400, mounting cylinder; 410, clamping plate; 511, mother arm; 512, child arm; 513, adjusting spring; 610, mother hole; 620, child hole; 630, auxiliary rod; 640, clamping column; 650, reset spring; 710, fine-tuning cam; 720, fine-tuning plate; 730, adjusting handle; 810, friction disk; 820, movable disk; 830, pressure spring; 900, workpiece. DETAILED DESCRIPTION

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] An embodiment of a grinding device for a bicycle frame of the present invention is as follows: Figures 1 to 11As shown: a grinding device for a bicycle frame, including a frame 100, a driving wheel 200, a sanding belt 300, a mounting tube 400, a clamping device, and a damping device; the frame 100 is arranged front and back; the axis of the driving wheel 200 is arranged horizontally left and right; the driving wheel 200 is rotatably mounted on the frame 100; a motor is fixed on the frame 100; the output shaft of the motor and the driving wheel 200 are fixedly connected. A front wheel 210 is provided at the front side of the driving wheel 200; the front wheel 210 is arranged left and right; the front wheel 210 is rotatably mounted on the frame 100; the diameter of the front wheel 210 is larger than that of the driving wheel 200; a slide groove 110 is provided at the rear end of the frame 100; the slide groove 110 is an arc groove extending up and down; and the center of the slide groove 110 falls on the axis of the driving wheel 200; an upper shaft 220 is provided at the rear side of the driving wheel 200; the upper shaft 220 is arranged left and right; the upper shaft 220 is slidably mounted in the slide groove 110; initially, the upper shaft 220 is at the upper end of the slide groove 110; an upper wheel 221 is coaxially rotatably mounted on the upper shaft 220; a lower shaft 230 is provided below the upper wheel 221; the lower shaft 230 is arranged at the rear side of the driving wheel 200; the lower shaft 230 is arranged left and right; the lower shaft 230 is fixed on the frame 100; and a lower wheel 231 is rotatably mounted on the lower shaft 230.

[0041] The abrasive belt 300 is in the shape of a circle connected end to end; the abrasive belt 300 that passes by the upper wheel 221 passes by the front side of the driving wheel 200 and is then wound around the lower wheel 231, so that the abrasive belt 300 forms a processing gap 310 on the upper and lower sides of the driving wheel 200; initially, the processing gap 310 is in a V-shape with the small end facing forward. When the workpiece 900 needs to be polished, the upper shaft 220 is driven along the slide groove 110 to approach the lower shaft 230, and the upper wheel 221 drives the part of the abrasive belt 300 above the driving wheel 200 to swing downward around the axis of the driving wheel 200, so that the processing gap 310 is in a V-shape with the small end facing backward; the V-shaped processing gap 310 can adapt to workpieces 900 of different diameters. The larger the diameter of the workpiece 900, the closer the workpiece 900 is to the driving wheel 200.

[0042] Two mounting cylinders 400 are provided, which are distributed on both sides of the abrasive belt 300 and are arranged in the processing gap 310; the mounting cylinders 400 are arranged on the left and right sides; a clamping disk 410 is rotatably installed at one end of the mounting cylinder 400 close to the abrasive belt 300.

[0043] The clamping device is used to support the installation cylinder 400 in the processing gap 310, and when the processing gap 310 is in a V-shape with the small end facing backward, the installation cylinder 400 is driven to move the workpiece 900 backward through the clamping plate 410, so that the upper and lower ends of the workpiece 900 abut against the abrasive belt 300. Two clamping devices are provided, which are distributed on both sides of the abrasive belt 300.

[0044] The clamping device includes two swing arms; the two swing arms are symmetrically distributed on the upper and lower sides of the mounting tube 400, and are in a V shape with the small end facing the mounting tube 400; the swing arm is a sleeve-type telescopic rod; the swing arm includes a mother arm 511 and a child arm 512; the mother arm 511 is arranged away from the mounting tube 400; the mother arm 511 is a sleeve; the child arm 512 is slidably inserted in the mother arm 511; an adjustment spring 513 is fixedly connected between the mother arm 511 and the child arm 512; the child arm 512 of the lower swing arm The upper end of the arm 512 and the mounting tube 400 are rotatably and slidably matched, and the lower end of the mother arm 511 of the lower swing arm and the lower shaft 230 are rotatably and slidably matched; the upper end of the mother arm 511 of the upper swing arm and the upper shaft 220 are rotatably and slidably matched, and the lower end of the sub-arm 512 of the upper swing arm and the mounting tube 400 are rotatably and slidably matched; a connecting rod is fixedly connected between the upper ends of the upper swing arms of the two clamping devices; the connecting rod is a telescopic rod, and the length is locked by bolts.

[0045] Auxiliary components are provided between the mother arm 511 and the sub-arm 512; in the initial state, the sub-arm 512 extends out of the mother arm 511, and the auxiliary components limit the relative movement of the mother arm 511 and the sub-arm 512, so that the adjusting spring 513 is stretched and stored. When the upper shaft 220 approaches the lower shaft 230 along the slide groove 110, the upper wheel 221 drives the part of the sanding belt 300 above the driving wheel 200 to swing downward around the axis of the driving wheel 200, so that the processing gap 310 is in a V shape with the small end facing backward, the sliding restriction between the mother arm 511 and the sub-arm 512 is released, so that the adjusting spring 513 releases the force and contracts, driving the sub-arm 512 to drive the installation cylinder 400 to move backward, so that the upper and lower ends of the workpiece 900 are in contact with the sanding belt 300, and the V-shaped processing gap 310 can adapt to workpieces 900 of different diameters. The larger the diameter of the workpiece 900, the closer the workpiece 900 is to the driving wheel 200.

[0046] The auxiliary component includes a mother hole 610, a sub-hole 620, and an auxiliary rod 630; the mother hole 610 is a through hole arranged on the side wall of the angle bisector of the V-shaped angle of the mother arm 511 away from the two swing arms of the same clamping device; the sub-hole 620 is arranged on the side wall of the angle bisector of the V-shaped angle of the sub-arm 512 away from the two swing arms of the same clamping device; the auxiliary rod 630 is perpendicular to the corresponding mother arm 511; the auxiliary rod 630 is slidably mounted on the mother arm 511 in a direction perpendicular to the mother arm 511; one end of the auxiliary rod 630 away from the angle bisector of the V-shaped angle of the two swing arms of the same clamping device A clamping column 640 is fixed by a transverse connecting rod; the axis of the clamping column 640 is parallel to the auxiliary rod 630; one end of the auxiliary rod 630 close to the angular bisector of the V-shaped angle of the two swing arms of the same clamping device extends to between the V-shaped angles of the two swing arms of the same clamping device; a reset spring 650 is fixedly connected between one end of the auxiliary rod 630 close to the angular bisector of the V-shaped angle of the two swing arms of the same clamping device and the mother arm 511; initially, the reset spring 650 causes the clamping column 640 to pass through the mother hole 610 and be inserted into the child hole 620 to limit sliding between the mother arm 511 and the child arm 512.

[0047] When the upper shaft 220 approaches the lower shaft 230 along the slide groove 110, the upper wheel 221 drives the sanding belt 300 above the driving wheel 200 to swing downward around the axis of the driving wheel 200, so that the processing gap 310 is in a V-shape with the small end facing backwards, and the two auxiliary rods 630 on the two swing arms of the same clamping device are close to one end of the angular bisector of the V-shaped angle of the two swing arms of the same clamping device and press against each other, compressing the reset spring 650, driving the auxiliary rod 630 to drive the clamping column 640 away from the angular bisector of the V-shaped angle of the two swing arms of the same clamping device, so that the clamping column 640 is separated from the sub-hole 620, and the sliding restriction between the mother arm 511 and the child arm 512 is released.

[0048] The damping device is arranged between the mounting cylinder 400 and the clamping plate 410; when the sanding belt 300 rotates, the sanding belt 300 on the upper and lower sides of the driving wheel 200 moves in opposite directions, so that the sanding forces of the sanding belt 300 on the upper and lower sides of the driving wheel 200 acting on the workpiece 900 during the grinding process cancel each other out, making the workpiece 900 more stable during grinding. At the same time, the sanding belt 300 on the upper and lower sides of the driving wheel 200 moves in opposite directions to drive the workpiece 900 to rotate, and the damping device provides rotational resistance for the rotation of the clamping plate 410, so that the linear velocity at the surface of the workpiece 900 is less than the moving velocity of the sanding belt 300, thereby achieving grinding of the entire surface of the workpiece 900 and improving the grinding effect.

[0049] The damping device includes a friction disk 810; the friction disk 810 is arranged in the mounting cylinder 400 and is on the side where the two clamping disks 410 are away from each other; the friction disk 810 and the clamping disk 410 are abutted and frictionally matched; the friction disk 810 is axially slidably installed in the mounting cylinder 400; a movable disk 820 is provided on the side of the friction disk 810 away from the clamping disk 410; the movable disk 820 is axially slidably installed in the mounting cylinder 400; a pressure spring 830 is connected to the movable disk 820 and the friction disk 810; the pressure spring 830 is in a compressed and force-storing state.

[0050] When the abrasive belt 300 drives the workpiece 900 to rotate, the pressure spring 830 provides pressure for the friction disk 810 to the clamping disk 410, so that friction resistance is generated between the friction disk 810 and the clamping disk 410, so that the surface of the workpiece 900 and the abrasive belt 300 slide relative to each other, and the workpiece 900 is polished and rotated at the same time to achieve polishing in the circumferential direction of the workpiece 900, thereby improving the polishing effect.

[0051] In this embodiment, a fine adjustment component is provided on the sub-arm 512; the fine adjustment component is used to adjust the friction resistance between the friction disk 810 and the clamping disk 410 according to the diameter of the workpiece 900, and the larger the diameter of the workpiece 900, the greater the friction resistance of the friction disk 810 on the clamping disk 410. As the diameter of the workpiece 900 increases, the force arm of the grinding force of the abrasive belt 300 on the workpiece 900 increases, making it easier for the workpiece 900 to be driven to rotate by the abrasive belt 300. Therefore, the friction resistance between the friction disk 810 and the clamping disk 410 is adjusted according to the diameter of the workpiece 900 by the fine adjustment component.

[0052] The fine-tuning assembly includes a fine-tuning protrusion 710 and a fine-tuning plate 720; the fine-tuning protrusion 710 is fixed to the end of the movable disk 820 away from the clamping disk 410; the fine-tuning plate 720 is arranged to be tilted forward and backward, and is arranged along the length direction of the swing arm, and is located on the side of the mounting tube 400 away from the sanding belt 300; the fine-tuning plate 720 is fixed on the mother arm 511 of the upper swing arm; the side wall of the fine-tuning plate 720 close to the mounting tube 400 is set as a fine-tuning wall; the fine-tuning wall and the fine-tuning protrusion 710 are abutted; the fine-tuning wall is a wedge-shaped wall; the distance from the end of the fine-tuning wall close to the driving wheel 200 to the clamping disk 410 is smaller than the distance from the end of the fine-tuning wall away from the driving wheel 200 to the clamping disk 410.

[0053] Since the V-shaped machining gap 310 can adapt to workpieces 900 of different diameters, the larger the diameter of the workpiece 900, the closer the workpiece 900 is to the driving wheel 200. As the diameter of the workpiece 900 increases, the greater the force arm of the grinding force exerted by the abrasive belt 300 on the workpiece 900, making it easier for the workpiece 900 to be driven to rotate by the abrasive belt 300. When the diameter of the workpiece 900 increases, the mounting cylinder 400 is closer to the driving wheel 200, and the distance from the fine-tuning wall to the clamping disk 410 is smaller. The fine-tuning wall pushes the fine-tuning convex 710 to approach the clamping disk 410, and compresses the pressing spring 830, increasing the friction resistance between the friction disk 810 and the clamping disk 410, so that the workpiece 900 is always ground at a relatively constant speed, improving the grinding effect.

[0054] In this embodiment, an adjustment handle 730 is fixed on the fine-tuning plate 720. Pull the adjustment handle 730 left and right, pull the swing arm to drive the installation cylinder 400 to move left and right, adjust the grinding part of the workpiece 900, and adapt to the grinding of workpieces 900 of different lengths. An operating handle 222 is fixed to the end of the upper shaft 220; a clamping sleeve is threadedly connected to the operating handle 222. Initially, the clamping sleeve and the frame 100 are clamped to limit the upper shaft 220 at the upper end of the slide groove 110. Loosen the bolts on the connecting rod, pull the swing arms of the two clamping devices apart, move the two installation cylinders 400 away, and when the workpiece 900 is placed between the two clamping disks 410, the connecting rod is contracted to clamp the workpiece 900 between the two clamping disks 410; tighten the bolts on the connecting rod again to lock the length of the connecting rod. Then, the clamping sleeve is loosened to separate the clamping sleeve and the frame 100, and the upper shaft 220 is pressed down by the operating handle 222 to drive the upper shaft 220 along the slide groove 110 to approach the lower shaft 230, and the upper wheel 221 drives the sanding belt 300 above the driving wheel 200 to swing downward around the axis of the driving wheel 200, so that the processing gap 310 is in a V shape with the small end facing backward.

[0055] In this embodiment, a tensioning wheel 240 is also provided in the circle of the sanding belt 300; the tensioning wheel 240 is provided between the upper wheel 221 and the driving wheel 200, and is located above the driving wheel 200; a tensioning plate is rotatably mounted on the tensioning wheel 240; the tensioning plate and the frame 100 are hinged around a horizontal axis; a torsion spring is connected to the hinge between the tensioning plate and the frame 100; the torsion spring makes the upper end of the tensioning wheel 240 abut against the sanding belt 300, and tensions the sanding belt 300.

[0056] In combination with the above embodiments, the use principle and working process of the present invention are as follows: Initially, the clamping sleeve and the frame 100 are clamped, and the upper shaft 220 is limited to the upper end of the slide groove 110. Loosen the bolts on the connecting rod, pull the swing arms of the two clamping devices apart, and move the two mounting cylinders 400 away. When the workpiece 900 is placed between the two clamping disks 410, the connecting rod is contracted to clamp the workpiece 900 between the two clamping disks 410; tighten the bolts on the connecting rod again to lock the length of the connecting rod. Then loosen the clamping sleeve to separate the clamping sleeve and the frame 100, press the upper shaft 220 down by operating the handle 222, drive the upper shaft 220 along the slide groove 110 to approach the lower shaft 230, and the upper wheel 221 drives the sanding belt 300 above the driving wheel 200 to swing downward around the axis of the driving wheel 200, so that the processing gap 310 is in a V shape with the small end facing backward.

[0057] When the upper shaft 220 approaches the lower shaft 230 along the slide groove 110, the upper wheel 221 drives the sanding belt 300 above the driving wheel 200 to swing downward around the axis of the driving wheel 200, so that the processing gap 310 is in a V-shape with the small end facing backwards, and the two auxiliary rods 630 on the two swing arms of the same clamping device are close to one end of the angular bisector of the V-shaped angle of the two swing arms of the same clamping device and press against each other, compressing the reset spring 650, driving the auxiliary rod 630 to drive the clamping column 640 away from the angular bisector of the V-shaped angle of the two swing arms of the same clamping device, so that the clamping column 640 is separated from the sub-hole 620, and the sliding restriction between the mother arm 511 and the child arm 512 is released. The adjusting spring 513 releases its force and contracts, driving the sub-arm 512 to drive the mounting cylinder 400 to move backward, so that the upper and lower ends of the workpiece 900 abut against the abrasive belt 300. The V-shaped processing gap 310 can adapt to workpieces 900 of different diameters. The larger the diameter of the workpiece 900, the closer the workpiece 900 is to the driving wheel 200.

[0058] Then, the motor drives the sanding belt 300 to rotate via the driving wheel 200 .

[0059] When the sanding belt 300 rotates, the sanding belts 300 on the upper and lower sides of the driving wheel 200 move in opposite directions, so that the sanding forces of the sanding belts 300 on the upper and lower sides of the driving wheel 200 acting on the workpiece 900 cancel each other out during the sanding process, making the workpiece 900 more stable during sanding. At the same time, the sanding belts 300 on the upper and lower sides of the driving wheel 200 move in opposite directions to drive the workpiece 900 to rotate, and the damping device provides rotational resistance for the rotation of the clamping plate 410, so that the linear speed at the surface of the workpiece 900 is less than the moving speed of the sanding belt 300, thereby achieving sanding of the entire surface of the workpiece 900 and improving the sanding effect.

[0060] Since the V-shaped machining gap 310 can adapt to workpieces 900 of different diameters, the larger the diameter of the workpiece 900, the closer the workpiece 900 is to the driving wheel 200. As the diameter of the workpiece 900 increases, the greater the force arm of the grinding force exerted by the abrasive belt 300 on the workpiece 900, making it easier for the workpiece 900 to be driven to rotate by the abrasive belt 300. When the diameter of the workpiece 900 increases, the mounting cylinder 400 is closer to the driving wheel 200, and the distance from the fine-tuning wall to the clamping disk 410 is smaller. The fine-tuning wall pushes the fine-tuning convex 710 to approach the clamping disk 410, and compresses the pressing spring 830, increasing the friction resistance between the friction disk 810 and the clamping disk 410, so that the workpiece 900 is always ground at a relatively constant speed, further improving the grinding effect.

[0061] After grinding for a period of time, the adjustment handle 730 is pulled left and right, and the swing arm is pulled to drive the installation cylinder 400 to move left and right, and the grinding part of the workpiece 900 is adjusted to adapt to the grinding of workpieces 900 of different lengths.

[0062] After grinding, the upper shaft 220 is pulled up by operating the handle 222, and the upper shaft 220 is again limited at the upper end of the slide groove 110 by the clamping sleeve. The sub-arm 512 is manually pulled out of the mother arm 511, and when the sub-hole 620 and the mother hole 610 are coaxial, the return spring 650 drives the clamping column 640 to be reinserted into the sub-hole 620, limiting the sliding between the mother arm 511 and the sub-arm 512.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A grinding device for a bicycle frame, characterized in that: include: Rack, front and rear settings; The driving wheel, the axis is arranged horizontally left and right; the driving wheel is rotatably mounted on the frame; a front wheel is arranged in front of the driving wheel; the front wheel is arranged left and right; the front wheel is rotatably mounted on the frame; a slide groove is arranged at the rear end of the frame; the slide groove is a circular arc groove extending up and down; and the center of the slide groove falls on the axis of the driving wheel; an upper shaft is arranged at the rear side of the driving wheel; the upper shaft is arranged left and right; the upper shaft is slidably mounted in the slide groove; initially, the upper shaft is at the upper end of the slide groove; an upper wheel is coaxially rotatably mounted on the upper shaft; a lower shaft is arranged below the upper wheel; the lower shaft is arranged at the rear side of the driving wheel; the lower shaft is arranged left and right; the lower shaft is fixed on the frame; a lower wheel is rotatably mounted on the lower shaft; The abrasive belt is a circle connected end to end to form a circle; the front wheel, the upper wheel and the lower wheel are in the circle formed by the abrasive belt, and the driving wheel is outside the circle formed by the abrasive belt. The abrasive belt passing around the upper wheel passes around the front side of the driving wheel and then is wound around the lower wheel, so that the abrasive belt forms a processing gap on the upper and lower sides of the driving wheel; initially, the processing gap is in a V shape with the small end facing forward. When the workpiece needs to be polished, the upper shaft is driven along the slide groove to approach the lower shaft, so that the processing gap is in a V shape with the small end facing backward. There are two mounting cylinders, which are distributed on both sides of the abrasive belt and are arranged in the processing gap; the mounting cylinders are arranged on the left and right sides; a clamping disc is rotatably installed at one end of the mounting cylinder close to the abrasive belt; The clamping device is used to support the installation cylinder in the processing gap, and when the processing gap is in a V-shape with the small end facing backwards, the installation cylinder is driven to move the workpiece backwards through the clamping disk, so that the upper and lower ends of the workpiece are in contact with the abrasive belt; The damping device is arranged between the mounting tube and the clamping disk; when the abrasive belt rotates, the abrasive belts on the upper and lower sides of the driving wheel move in opposite directions to drive the workpiece to rotate, and the damping device provides rotation resistance for the rotation of the clamping disk.

2. A grinding device for a bicycle frame according to claim 1, characterized in that: There are two clamping devices, which are distributed on both sides of the abrasive belt; the clamping device includes two swing arms; the two swing arms are symmetrically distributed on the upper and lower sides of the mounting tube, and are in a V shape with the small end facing the mounting tube; The swing arm is a sleeve-type telescopic rod; the swing arm includes a mother arm and a sub-arm; the mother arm is arranged away from the mounting tube; the mother arm is a sleeve; the sub-arm is slidably inserted in the mother arm; an adjustment spring is fixedly connected between the mother arm and the sub-arm; the upper end of the sub-arm of the lower swing arm and the mounting tube are rotatably and slidably matched, and the lower end of the mother arm of the lower swing arm and the lower shaft are rotatably and slidably matched; The upper end of the mother arm of the upper swing arm and the upper shaft are rotatably and slidably matched, and the lower end of the sub-arm of the upper swing arm and the mounting tube are rotatably and slidably matched; a connecting rod is fixedly connected between the upper ends of the upper swing arms of the two clamping devices; the connecting rod is a telescopic rod, and the length is locked by a bolt; Auxiliary components are provided between the mother arm and the sub-arm. In the initial state, the sub-arm extends out of the mother arm, and the auxiliary components limit the relative movement of the mother arm and the sub-arm so that the adjusting spring is stretched and stores force. When the upper shaft approaches the lower shaft along the slide groove, so that the processing gap is in a V shape with the small end facing backward, the sliding restriction between the mother arm and the sub-arm is released, so that the adjusting spring releases force and contracts, driving the sub-arm to drive the installation cylinder backward.

3. A grinding device for a bicycle frame according to claim 2, characterized in that: The auxiliary components include a mother hole, a child hole, and an auxiliary rod; The mother hole is a through hole provided on the side wall of the mother arm away from the angle bisector of the V-shaped angle of the two swing arms of the same clamping device; The sub-hole is arranged on the side wall of the sub-arm away from the bisector of the V-shaped angle of the two swing arms of the same clamping device; The auxiliary rod is perpendicular to the corresponding mother arm; the auxiliary rod is slidably installed on the mother arm in a direction perpendicular to the mother arm; a clamping column is fixed to one end of the auxiliary rod away from the angular bisector of the V-shaped angle of the two swing arms of the same clamping device through a transverse connecting rod; the axis of the clamping column is parallel to the auxiliary rod; an end of the auxiliary rod close to the angular bisector of the V-shaped angle of the two swing arms of the same clamping device extends to between the V-shaped angles of the two swing arms of the same clamping device; a reset spring is fixedly connected between one end of the auxiliary rod close to the angular bisector of the V-shaped angle of the two swing arms of the same clamping device and the mother arm; initially, the reset spring causes the clamping column to pass through the mother hole and be inserted into the child hole to limit sliding between the mother arm and the child arm.

4. A grinding device for a bicycle frame according to claim 3, characterized in that: The damping device includes a friction disk; the friction disk is arranged in the mounting tube and is located on the side where the two clamping disks are away from each other; the friction disk and the clamping disk are in abutment with each other and frictionally matched; the friction disk is axially slidably mounted in the mounting tube along the mounting tube; a movable disk is arranged on the side of the friction disk away from the clamping disk; the movable disk is axially slidably mounted in the mounting tube along the mounting tube; a pressure spring is connected to the movable disk and the friction disk; the pressure spring is in a compressed and force-storing state.

5. A grinding device for a bicycle frame according to claim 4, characterized in that: A fine-tuning assembly is provided on the sub-arm; the fine-tuning assembly is used to adjust the friction resistance between the friction disk and the clamping disk according to the diameter of the workpiece, and when the diameter of the workpiece is larger, the friction resistance of the friction disk on the clamping disk is larger.

6. A grinding device for a bicycle frame according to claim 5, characterized in that: The fine-tuning component includes a fine-tuning convex and a fine-tuning plate; The fine-adjusting convex is fixed to the end of the movable plate away from the clamping plate; The fine-tuning plate is arranged to be tilted forward and backward, and is arranged along the length direction of the swing arm, and is located on the side of the mounting tube away from the abrasive belt; The fine-tuning plate is fixed to the female arm of the upper swing arm; The side wall of the fine-tuning plate close to the mounting tube is set as a fine-tuning wall; the fine-tuning wall is in contact with the fine-tuning protrusion; The fine-tuning wall is a wedge-shaped wall; The distance from one end of the fine-tuning wall close to the driving wheel to the clamping disk is smaller than the distance from one end of the fine-tuning wall far from the driving wheel to the clamping disk.

7. A grinding device for a bicycle frame according to claim 6, characterized in that: An adjusting handle is fixed on the fine-tuning plate.

8. The grinding device for a bicycle frame according to claim 7, characterized in that: An operating handle is fixed at the end of the upper shaft; a clamping sleeve is threadedly connected to the operating handle.

9. The grinding device for a bicycle frame according to claim 1, characterized in that: A motor is fixed on the frame; the output shaft of the motor is fixedly connected to the driving wheel.

10. The grinding device for a bicycle frame according to claim 1, characterized in that: A tensioning wheel is also provided in the circle of the abrasive belt; the tensioning wheel is provided between the upper wheel and the driving wheel and is located above the driving wheel; a tensioning plate is rotatably mounted on the tensioning wheel; the tensioning plate and the frame are hinged around a horizontal axis; a torsion spring is connected at the hinge between the tensioning plate and the frame; the torsion spring makes the upper end of the tensioning wheel contact with the abrasive belt.

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