Swing head type belt sander

Abstract

The present application relates to a kind of swing head type abrasive belt machine, including frame, polishing piece support table, polishing piece positioning device, swing head type polishing execution mechanism;Polishing piece support table is installed on the front end of frame upper side;Polishing piece positioning device is installed on polishing piece support table, and is made of two ruler units of left-right symmetry arrangement;Two ruler units are made of ruler and ruler position adjusting mechanism;Two rulers are arranged at 90 ° angle, and the front of two rulers is respectively contacted with the two sides of polishing piece welding position, realizes the positioning of polishing piece;Swing head type polishing execution mechanism includes annular sand belt, sand belt operation drive mechanism, swing support, left and right movement drive mechanism connected swing support, left and right deflection drive mechanism connected swing support;Swing support, left and right movement drive mechanism, left and right deflection drive mechanism jointly constitute left and right reciprocating swing execution mechanism, for driving the front end of annular sand belt realizes left and right reciprocating swing motion.The present application improves polishing quality and polishing efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of grinding equipment, specifically relating to a swing head belt sander. Background Technology

[0002] Currently, the structure of cabinets such as electrical cabinets is generally a sheet metal welded structure. After two sheet metal parts are butt-welded, part of the weld seam protrudes from the surface of the sheet metal body and needs to be ground. Existing grinding methods mainly include manual grinding and simple belt sander grinding. Manual grinding requires fixing the grinding part and manually pulling the grinding belt back and forth to grind the weld seam, which has the disadvantages of low grinding efficiency and poor grinding consistency. On the other hand, using a simple belt sander requires manual assistance to control and adjust the relative position of the workpiece and the sanding belt. If the grinding part and the sanding belt are too close, it will result in over-grinding, affecting the quality of the weld seam and causing grinding damage to the sheet metal body. If the grinding part and the sanding belt are too far apart, it will result in under-grinding, resulting in insufficient grinding. Therefore, it is impossible to ensure the grinding quality and the consistency of grinding in all areas. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a swing head belt sander that improves processing efficiency and quality and reduces manpower.

[0004] The above-mentioned objective of this invention is achieved through the following technical solution:

[0005] A swing-head belt sander, characterized in that it includes a frame, a workpiece support platform, a workpiece positioning device, and a swing-head sanding actuator; the workpiece support platform is installed above the front end of the frame; the workpiece positioning device is installed on the workpiece support platform and consists of two symmetrically arranged guide ruler units; each guide ruler unit consists of a guide ruler and a guide ruler position adjustment mechanism connected to the back of the guide ruler; the guide rulers of the two guide ruler units are arranged at a 90° angle, and the front of the two guide rulers respectively contacts the two sides of the welding part of the workpiece to achieve positioning of the workpiece; the swing-head sanding actuator includes an annular sanding belt, a sanding belt drive mechanism for supporting and driving the annular sanding belt, a swing bracket, a left and right movement drive mechanism connected to the swing bracket, and a left and right sway drive mechanism connected to the swing bracket; the swing bracket, the left and right movement drive mechanism, and the left and right sway drive mechanism together constitute a left and right reciprocating swing actuator, used to drive the front end of the annular sanding belt to achieve left and right reciprocating swing motion.

[0006] Furthermore, the straightedge position adjustment mechanism includes a straightedge fixing frame, an adjusting screw, a screw guide block, a screw mating block, and a screw locking component. The front end of the straightedge fixing frame is fixedly connected to the back of the straightedge, and the rear end of the straightedge fixing frame is connected to the front end of the adjusting screw in a manner that limits its position axially and allows it to rotate circumferentially. The screw guide block is fixed to the grinding workpiece support platform and is located behind the straightedge fixing frame. A screw through hole is provided on the screw guide block, forming a clearance fit with the adjusting screw. A threaded hole is vertically connected to the upper part of the screw guide block corresponding to the position of the screw through hole, and a screw locking component is connected in the threaded hole. The screw mating block is fixed to the grinding workpiece support platform and is located behind the screw guide block. A threaded hole is provided on the screw mating block, forming a threaded connection with the adjusting screw. A knob is fixed to the rear end of the adjusting screw.

[0007] Furthermore, the sanding belt drive mechanism includes a driving sanding belt wheel located at the rear and two driven sanding belt wheels located on the left and right sides at the front. The driving sanding belt wheel is a large wheel, and the two driven sanding belt wheels are small wheels. The lower end of the driving sanding belt wheel is driven and connected to the sanding belt wheel drive motor. The two driven sanding belt wheels are rotatably connected to the left and right sides of the swing bracket. The annular sanding belt is wrapped around the outer surface of the driving sanding belt wheel and the two driven sanding belt wheels in the front-back direction.

[0008] Furthermore, the abrasive belt drive motor is vertically fixedly mounted on a motor mounting plate that can be moved back and forth; the lower end of the motor mounting plate is connected to the upper mounting surface of the frame through two sets of linear guide rails on the left and right; a rear baffle is fixedly connected to the rear of the motor mounting plate, and a tensioning cylinder connected to the frame applies a backward thrust to the rear baffle, pushing the motor mounting plate and the active abrasive belt wheel backward to achieve tensioning of the annular abrasive belt.

[0009] Furthermore, the left-right movement drive mechanism includes a front support frame, a rear support frame, and a front support frame drive mechanism. The front support frame comprises an upper support arm and a lower support arm arranged parallel to each other vertically, and a rear connecting plate connecting the rear parts of the upper and lower support arms. The front ends of the upper and lower support arms are rotatably connected to the top center and bottom center of the swing bracket, respectively, via bearings, and their rotation centers are located on the same axis. The rear support frame is located at the rear of the front support frame, and its lower end is fixedly connected to the support platform at the upper end of the middle of the frame. The upper part of the rear support frame is provided with a guide slot along the left-right direction. A guide roller assembly is slidably installed within the guide slot, and the guide roller assembly is vertically connected to the rear of the upper support arm; the front support frame drive mechanism is integrally located below the front support frame, used to realize the left-right reciprocating motion of the front support frame; the front support frame drive mechanism includes a front drive shaft, a front drive disc, left-right moving sliders, and left-right moving guide rods; the front drive shaft is rotatably and vertically mounted at the front of the support platform; the lower end of the front drive shaft is fixedly connected to a front drive wheel for power input, and the upper end of the front drive shaft is connected to the front drive disc. The shaft is fixedly connected; a front eccentric shaft extends upward and outward from the upper end of the front drive disc; the left and right sliding blocks are slidably connected above the front drive disc via two left and right sliding guide rods, with the left and right ends of the two left and right sliding rods respectively supported on the left and right guide rod supports, and the two guide rod supports are fixed to the support platform at the upper end of the middle of the frame; a guide groove along the front and rear direction is formed at the lower end of the left and right sliding blocks; the guide groove and the guide roller fixed on the front eccentric shaft form an insert guide fit; the upper end of the left and right guide sliders is fixedly connected to the lower support arm of the front support frame.

[0010] Furthermore, the front drive disc is a combined structure of a front cover, a middle disc body, and a rear cover; an eccentric adjustment groove is provided in the middle of the middle disc body along the front-rear direction; the front eccentric shaft is composed of a lower adjustment block and an upper shaft body, the adjustment block being inserted into the eccentric adjustment groove with a clearance fit; the upper shaft body is threaded near the lower adjustment block, and the front eccentric shaft is tightened after adjustment by installing washers and locking nuts; a threaded hole is provided on the front eccentric adjustment shaft along the front-rear direction, and a first adjustment screw is connected in the threaded hole, the front end and the position near the rear end of the first adjustment screw are respectively rotatably supported by the front cover and the rear cover, and an adjustment cap is connected to the rear end of the first adjustment screw; a scale mark is provided radially on the upper end of the middle disc body outside the eccentric adjustment groove, with the 0 point of the scale mark approaching the center position of the middle disc body.

[0011] Furthermore, the left and right sway drive mechanism includes a rear drive shaft, a rear drive disc, a front and rear moving slider, a front and rear moving guide rod, a rack, a gear, a first sway drive arm, and a second sway drive arm; the rear drive shaft is rotatably and vertically mounted at the rear of the support platform; a rear drive wheel is fixedly connected to the lower end of the rear drive shaft for power input; the upper end of the rear drive shaft is coaxially and fixedly connected to the rear drive disc, and a rear eccentric shaft extends upward and outward from the upper end of the rear drive disc; the front and rear moving slider is slidably connected above the rear drive disc via two left and right front and rear moving guide rods, and the front and rear ends of the two front and rear moving rods are respectively supported on the guide rod supports on the front and rear sides, and the two guide rod supports are fixed to the support platform at the upper middle part of the frame; The forward and backward moving slider has a guide groove along the left and right direction, which forms an insert guide engagement with the guide roller fixed on the rear eccentric shaft; the rack is fixed above the forward and backward moving slider along the front and back direction; the gear is fixed to the upper end of the gear shaft, which is vertically rotatably mounted above the support platform, and the gear and rack form a tooth mesh; one end of the first swing drive arm is fixedly connected to the gear shaft, and the other end of the first swing drive arm is rotatably connected to the rear end of the second swing drive arm along the vertical direction axis; the front end of the second swing drive arm is rotatably connected to the bottom plate of the swing bracket near the left and right sides along the vertical direction axis.

[0012] Furthermore, the rear drive disc is a combination of a left end cover, a middle disc body, and a right end cover; an eccentric adjustment groove is provided in the middle of the middle disc body along the left-right direction; the rear eccentric shaft is composed of a lower adjustment block and an upper shaft body, with the lower adjustment block of the rear eccentric shaft being fitted into the eccentric adjustment groove on the rear drive disc with a clearance fit; the upper shaft body of the rear eccentric shaft is threaded near the lower adjustment block, and the rear eccentric shaft is tightened after adjustment by installing washers and locking nuts; a threaded hole is provided in the lower adjustment block of the rear eccentric shaft along the left-right direction, and a second adjustment screw is connected in the threaded hole. The right end and the position near the left end of the second adjustment screw are respectively rotatably supported by the right end cover and the left end cover, and an adjustment cap is connected to the left end of the second adjustment screw; a scale mark is provided radially on the upper end of the central disc body of the rear drive disc, located outside the eccentric adjustment groove, with the 0 point of the scale mark approaching the center position of the middle disc body of the rear drive disc.

[0013] Furthermore, a transmission belt is connected between the front drive wheel and the rear drive wheel. The transmission belt is tensioned by a tensioning mechanism. The lower end of the front drive shaft or the lower end of the rear drive shaft is connected to a reducer. The reducer is connected to a swing drive motor, which is installed below the support platform at the upper middle part of the frame.

[0014] Furthermore, the swing-head belt sander also includes a support platform vertical movement drive mechanism, comprising a drive execution mechanism and a drive guide mechanism. The drive guide mechanism includes two guide rods on each side and a guide rod slide that mates with each guide rod. The upper ends of the two guide rods on the left are vertically and fixedly connected to the lower part of the grinding support platform near the left front-rear position. The guide rod slides that mate with the two guide rods on the left are fixedly installed on the left side wall of the front part of the frame. The upper ends of the two guide rods on the right are vertically and fixedly connected to the lower part of the grinding support platform near the right front-rear position. The guide rod slides that mate with the two guide rods on the right are fixedly installed on the right side wall of the front part of the frame. The drive execution mechanism includes a vertical movement drive motor and a lead screw and nut mechanism. The vertical movement drive motor is connected to the lead screw via a reducer. The lead screw is supported on a lead screw support fixed below the support platform. The nut is fixedly connected to a vertical support plate. The vertical support plate is guided and installed on the front side plate below the support platform in the vertical direction. The upper end of the guide support plate is fixedly connected to the lower end of the support platform.

[0015] The advantages and positive effects of this invention are as follows:

[0016] 1. This invention supports the grinding parts through a grinding part support table and positions the grinding frame through a grinding part positioning device, aligning the weld seam on the grinding part with the front end of the abrasive belt. The swing head type grinding actuator drives the front end of the abrasive belt to achieve a compound motion of left and right movement and left and right swing, realizing rapid and uniform grinding of the weld seam, improving grinding efficiency and ensuring grinding consistency.

[0017] 2. This invention achieves the left-right reciprocating movement and left-right reciprocating oscillating motion of the sanding belt through two independent drive mechanisms, which has the advantage of convenient control. Furthermore, the front eccentric shaft is connected to the front drive disc in an adjustable eccentricity manner, which can realize the flexible and applicable adjustment of the amplitude of the left-right reciprocating motion. The rear eccentric shaft is connected to the rear drive disc in an adjustable eccentricity manner, which can realize the flexible and applicable adjustment of the swing amplitude of the left-right reciprocating oscillation, thereby improving the adjustability and applicability of the equipment.

[0018] 3. The grinding support table of the present invention is connected to the upper front part of the frame through the up and down moving drive mechanism of the support table, which can realize the up and down position adjustment of the grinding support table, thereby realizing the correspondence between the weld seam on the grinding part and the sanding belt at different parts in the width direction, thus realizing the full utilization of the sanding belt in the width direction. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional appearance of the invention. Figure 1 (First perspective);

[0020] Figure 2 This is a front view of the present invention;

[0021] Figure 3 This is a top view of the present invention;

[0022] Figure 4 This is a schematic diagram of the overall three-dimensional appearance of the invention. Figure 2 (Second angle, removing the outer panel of the sand belt)

[0023] Figure 5 This is a schematic diagram of the overall three-dimensional appearance of the invention. Figure 3 (Third angle, removing one side wall at the front of the rack)

[0024] Figure 6 This is the overall appearance of the swing head grinding actuator of the present invention. Figure 1 ;

[0025] Figure 7 This is the overall appearance of the swing head grinding actuator of the present invention. Figure 2 ;

[0026] Figure 8 This is a front view of the swing head grinding actuator of the present invention;

[0027] Figure 9 This is a top view of the swing head grinding actuator of the present invention;

[0028] Figure 10 This is a partial three-dimensional view of the swing head grinding actuator of the present invention;

[0029] Figure 11 This is a schematic diagram of the cooperation between the rear drive disc and the rear eccentric adjustment shaft of the present invention. Detailed Implementation

[0030] The structure of the present invention will be further described below with reference to the accompanying drawings and embodiments. It should be noted that these embodiments are descriptive and not limiting.

[0031] For an example of a swing-head belt sander, please refer to [link / reference]. Figures 1-11 The invention features a frame 1, a grinding workpiece support platform 4, a grinding workpiece positioning device 5, and a swing head grinding actuator 3.

[0032] The frame is the basic component of this belt sander and is used to centrally install other structures.

[0033] The grinding part support platform is used to support the grinding part and is installed at the upper front end of the frame.

[0034] The grinding part positioning device is used to position the grinding part, ensuring that the grinding area of ​​the grinding part maintains a set grinding depth with the front end of the sanding belt of the oscillating head grinding actuator. The grinding part positioning device is mounted on the grinding part support platform and consists of two symmetrically arranged guide rail units. Each guide rail unit comprises a guide rail 5.1 and a guide rail position adjustment mechanism connected to the back of the guide rail.

[0035] The left and right guide ruler units are set at a 90° angle, with the front sides of the two guide rulers contacting the two sides of the welding area of ​​the workpiece to achieve positioning. The guide ruler position adjustment mechanism is used to adjust the front and rear position of the guide ruler to achieve fine adjustment of the grinding depth. The guide ruler position adjustment mechanism includes a guide ruler fixing frame 5.2, an adjusting screw 5.3, a screw guide block 5.4, a screw mating block 5.6, and a screw locking component 5.5. The front end of the guide ruler fixing frame is fixedly connected to the back end of the guide ruler, and the rear end of the guide ruler fixing frame is connected to the front end of the adjusting screw via a bearing in a manner that limits axial movement and allows rotation in the circumferential direction. The screw guide block is fixed to the workpiece support platform and is located behind the guide ruler fixing frame. A screw through hole is provided on the screw guide block for the adjusting screw to pass through with a clearance fit. A threaded hole is vertically connected to the upper part of the screw guide block corresponding to the position of the screw through hole, and a screw locking component is connected in the threaded hole. A wrench 5.7 is located above and outside the screw guide block as a threaded locking component. By rotating the wrench, the lower end of the threaded locking component can be pressed against the adjusting screw, thus locking the adjusting screw. The screw mating block is fixed to the grinding part support platform and located behind the screw guide block. A threaded hole is provided on the screw mating block to form a threaded connection with the adjusting screw. To facilitate adjustment of the adjusting screw, a knob is fixed to the rear end of the adjusting screw; rotating the knob rotates the adjusting screw.

[0036] The swing head type grinding actuator is used to uniformly and efficiently grind the weld seam of the grinding part, and mainly includes an annular sanding belt 3.1, a sanding belt running drive mechanism 3.3, a swing bracket 3.2, a left and right moving drive mechanism 3.5, and a left and right swaying drive mechanism 3.4.

[0037] The sanding belt drive mechanism includes a driving sanding belt pulley 3.3.2 located at the rear and two driven sanding belt pulleys 3.3.3 located on the left and right sides at the front. The driving sanding belt pulley is a large pulley, and the two driven sanding belt pulleys are small pulleys. The lower end of the driving sanding belt pulley is driven and connected to the sanding belt pulley drive motor 3.3.1. The two driven sanding belt pulleys are rotatably connected to the left and right sides of the swing bracket. Specifically, the swing bracket is located directly in front of the driving sanding belt pulley and is positioned near the intersection of the extensions of the two straightedges. The swing bracket consists of a top plate, a bottom plate, and a rear side plate connecting the top plate and the bottom plate. A vertical support shaft is vertically fixedly installed between the top plate and the bottom plate near the left and right sides. The two driven sanding belt pulleys are rotatably supported and mounted on the two vertical support shafts via upper and lower bearings. The annular sanding belt is wound around the outer surface of the driving sanding belt pulley and the two driven sanding belt pulleys in the front-to-back direction.

[0038] To achieve tensioning of the annular abrasive belt, in this invention, the abrasive belt drive motor is vertically fixedly mounted on a motor mounting plate 3.3.4 that can move back and forth. The lower end of the motor mounting plate is connected to the upper mounting surface of the frame via two sets of linear guide rails. A rear baffle 3.3.5 is fixedly connected to the rear of the motor mounting plate. A tensioning cylinder 3.3.6 connected to the frame applies a rearward thrust to the rear baffle, pushing the motor mounting plate and the drive abrasive belt wheel backward, thereby achieving tensioning of the annular abrasive belt.

[0039] The left-right movement drive mechanism is used to support the swing bracket and drive the swing bracket and two driven sanding belt wheels mounted on the swing bracket to reciprocate in the left-right direction. It mainly includes a front support frame 3.5.3, a rear support frame 3.5.1, and a front support frame drive mechanism. The front support frame consists of an upper support arm 3.5.3a and a lower support arm 3.5.3b arranged parallel to each other, and a rear connecting plate 3.5.3c connecting the rear parts of the upper and lower support arms. The front ends of the upper and lower support arms are rotatably connected to the top center and bottom center of the swing bracket, respectively, via bearings, and their rotation centers are located on the same axis. The rear support frame is located at the rear of the front support frame, and its lower end is fixedly connected to the support platform at the upper end of the middle of the frame. The upper part of the rear support frame has a guide slot along the left-right direction. A guide roller assembly 3.5.2 is slidably installed in this guide slot, and the guide roller assembly is perpendicularly connected to the rear part of the upper support arm.

[0040] The front support frame drive mechanism is integrally located below the front support frame and mainly includes a front drive shaft 3.5.8, a front drive disc 3.5.7, left and right moving sliders 3.5.5, and left and right moving guide rods 3.5.4. The front drive shaft is vertically mounted to the front of the support platform via a shaft seat. A front drive wheel 3.5.9 is fixedly connected to the lower end of the front drive shaft for power input, and the upper end of the front drive shaft is coaxially fixedly connected to the front drive disc. A front eccentric shaft 3.5.6 extends upward from the upper end of the front drive disc. The left and right moving sliders are slidably connected above the front drive disc via two left and right moving guide rods. The left and right ends of the two left and right moving rods are respectively supported on guide rod supports on the left and right sides, and the two guide rod supports are fixed to the support platform at the upper middle part of the frame. The left and right moving sliders are connected to the two left and right moving guide rods via linear bearings, and a long guide groove along the front-rear direction is formed at the lower end of the left and right moving sliders. This guide groove forms an insert guide fit with the guide roller fixed on the front eccentric shaft. The upper ends of the left and right guide sliders are fixedly connected to the lower support arm of the front support frame by means of pins and screws.

[0041] The eccentricity of the front eccentric shaft relative to the central axis of the front drive disc is used to determine the left and right movement range of the left and right movement drive mechanism. To achieve flexible adjustment of the left and right movement range and meet the grinding requirements of weld seams on different grinding parts, in this invention, the front eccentric shaft is connected to the front drive disc in an adjustable eccentricity manner. Specifically, a possible structural form is as follows: the front and rear ends of the front drive disc are cut to form a combined structure of a front end cover, a middle disc body, and a rear end cover. Both the front end cover and the rear end cover are fixedly connected to the middle disc body with screws near the left and right sides. An eccentric adjustment groove is provided in the middle of the middle disc body along the front-rear direction. The eccentric adjustment groove is preferably, but not limited to, the dovetail groove shown in the attached figure. Corresponding to the eccentric adjustment groove on the middle disc body, the front eccentric shaft consists of a lower adjustment block portion and an upper shaft portion. The shape of the adjustment block portion is consistent with the shape of the eccentric adjustment groove, and it is embedded in the eccentric adjustment groove in a clearance fit manner. The upper shaft section near the lower adjusting block has threads, which are used to secure the front eccentric shaft after adjustment by installing washers and locking nuts. To facilitate adjustment of the eccentricity of the front eccentric adjusting shaft, threaded holes are provided along the front-to-back direction. A first adjusting screw is connected to these threaded holes. The front and rear ends of the first adjusting screw are supported by bearings on the front and rear end covers, respectively. An adjusting cap is connected to the rear end of the first adjusting screw for easy adjustment. Additionally, a scale is radially positioned on the upper part of the central disc body, outside the eccentricity adjustment groove. The 0 point of the scale is close to the center of the central disc body, allowing for easy and intuitive judgment of the eccentricity of the front eccentric shaft.

[0042] The left-right oscillation drive mechanism is used to drive the oscillating bracket and two driven sanding belt wheels mounted on the oscillating bracket to achieve left-right reciprocating oscillation. It mainly includes a rear drive shaft 3.4.10, a rear drive disc 3.4.9, a front-back moving slider 3.4.7, a front-back moving guide rod 3.4.6, a rack 3.4.2, a gear 3.4.3, a first oscillating drive arm 3.4.4, and a second oscillating drive arm 3.4.5. The rear drive shaft is vertically mounted to the rear of the support platform via a shaft seat, etc. The lower end of the rear drive shaft is fixedly connected to a rear drive wheel 3.4.11 for power input. The upper end of the rear drive shaft is coaxially fixedly connected to the rear drive disc. A rear eccentric shaft 3.4.8 extends upward and outward from the upper end of the rear drive disc. The front-back moving slider is slidably connected above the rear drive disc via two left and right front-back moving guide rods. The front and rear ends of the two front and back moving rods are respectively supported on guide rod supports on the front and rear sides, and the two guide rod supports are fixed to the support platform at the upper middle part of the frame. The forward and backward moving sliders are connected to two forward and backward moving guide rods via linear bearings. A long guide groove along the left-right direction is formed on the forward and backward moving sliders. This guide groove forms an insert guide fit with a guide roller fixed on the rear eccentric shaft. The upper end of the forward and backward guide sliders is connected to a rack support plate via a pin and screws. The rack is fixed to the rack support plate 3.4.1 along the forward and backward direction. The gear is fixed to the upper end of a gear shaft, which is perpendicular to the support platform at the upper middle part of the frame. The lower end of the gear shaft is rotatably connected to a bearing seat fixed on the support platform. The gear and rack mesh. One end of the first swing drive arm is fixedly connected to the gear shaft. The other end of the first swing drive arm is rotatably connected to the rear end of the second swing drive arm along a vertical axis. The front end of the second swing drive arm is rotatably connected to the bottom plate of the swing bracket near the left and right sides along a vertical axis.

[0043] The eccentricity of the rear eccentric shaft relative to the central axis of the rear drive disc is used to determine the left and right swing amplitude of the left and right oscillation drive mechanism. To achieve flexible adjustment of the left and right swing amplitude and meet the grinding requirements of weld seams on different grinding parts, in this invention, the rear eccentric shaft is connected to the rear drive disc in an adjustable eccentricity manner. Specifically, a possible structural form is as follows: the left and right ends of the rear drive disc are cut to form a combination structure of a left end cover, a middle disc body, and a right end cover. Both the left and right end covers are fixedly connected to the middle disc body with screws near the front and rear sides. An eccentric adjustment groove 3.4.9a is provided in the middle of the middle disc body along the left and right direction. The eccentric adjustment groove is preferably, but not limited to, the dovetail groove shown in the attached figure. Corresponding to the eccentric adjustment groove on the middle disc body, the rear eccentric shaft consists of a lower adjustment block portion 3.4.8a and an upper shaft portion. The shape of the adjustment block portion is consistent with the shape of the eccentric adjustment groove, and it is embedded in the eccentric adjustment groove in a clearance fit manner. The upper shaft body has threads near the lower adjusting block. By installing washers and locking nuts, the rear eccentric shaft is secured after adjustment. To facilitate adjustment of the eccentricity of the rear eccentric adjusting shaft, threaded holes are provided along the left-right direction. A second adjusting screw (3, 4, 12) is connected to these threaded holes. The right end and the portion near the left end of the second adjusting screw are supported by bearings on the right and left end caps, respectively. An adjusting cap is connected to the left end of the second adjusting screw for easy adjustment. Additionally, a radial scale is provided on the upper part of the central disc body, outside the eccentricity adjustment groove. The 0 point of the scale is close to the center of the central disc body, allowing for easy and intuitive judgment of the eccentricity of the rear eccentric shaft.

[0044] The front drive wheel of the left and right movement drive mechanism and the rear drive wheel of the left and right yaw drive mechanism can use the same power source to achieve transmission. Specifically, a transmission belt 3.6 is connected between the front drive wheel and the rear drive wheel. The transmission belt is tensioned by a tensioning mechanism. The front drive shaft or the rear drive shaft serves as the power input shaft and is connected to the reducer 3.7. The reducer is connected to the yaw drive motor 3.8. The yaw drive motor is installed below the support platform at the upper middle part of the frame to realize the power input.

[0045] In addition, to fully utilize the belt sander along its width, this belt sander is also equipped with a support platform vertical movement drive mechanism 6. The vertical movement drive mechanism includes a drive execution mechanism and a drive guide mechanism. The drive guide mechanism includes two guide rods 6.2 on each side and a guide rod slide 6.1 that cooperates with each guide rod. The upper ends of the two left guide rods are vertically and fixedly connected to the lower part of the grinding workpiece support platform near the left front-rear position. The guide rod slides that cooperate with the two left guide rods are fixedly installed on the left side wall of the front part of the frame. The upper ends of the two right guide rods are vertically and fixedly connected to the lower part of the grinding workpiece support platform near the right front-rear position. The guide rod slides that cooperate with the two right guide rods are fixedly installed on the right side wall of the front part of the frame. Through the cooperation of the four guide rods and guide rod slides, the grinding workpiece support platform is stably supported above the frame in a vertically movable manner. The drive actuator includes a vertical movement drive motor 6.3 and a lead screw and nut mechanism. The lead screw and nut in the lead screw and nut mechanism are connected by a trapezoidal thread. The vertical movement drive motor is driven by the lead screw 6.5 via a reducer 6.4. The lead screw is supported on a lead screw support fixed below the support platform. The nut 6.6 is fixedly connected to a vertical support plate 6.7. The vertical support plate is guided and installed on the front side plate below the support platform in the vertical direction. The upper end of the guide support plate is fixedly connected to the lower end of the support platform. By using the drive actuator, the vertical position of the grinding workpiece support table can be adjusted by rotating the vertical movement drive motor.

[0046] In addition to the main features mentioned above, the upper part of the frame, located around the annular sanding belt, employs a surrounding plate structure 2, with a top cover plate hinged to one side of the surrounding plate. This allows the annular sanding belt, the left-right movement drive mechanism, and the left-right oscillation drive mechanism to be housed inside the shell formed by the surrounding plate and the top cover plate, serving both a safety protection function and a dust and dirt prevention function for the equipment.

[0047] The working principle of the swing head belt sander of this invention:

[0048] Based on the size of the weld seam on the part to be ground, adjust the eccentricity of the front and rear eccentric shafts to appropriate positions. Then, place both sides of the weld seam on the inner side of the guide rails and adjust their positions to achieve the set grinding depth. At this point, the oscillating drive motor can be turned on, and the weld seam can be quickly and evenly ground by the reciprocating oscillation of the front end of the annular sanding belt. After the grinding belt has been running for a certain period of time, the up and down position of the grinding support table can be adjusted to allow the grinding belt to grind the weld seam at different locations along its width, thus making full use of the grinding belt.

[0049] This swing-head belt sander is suitable for processing single pieces in large batches, as well as for grinding weld seams of various welded parts, and has good applicability.

[0050] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A swing-head type belt sander, characterized in that: The device includes a frame, a grinding part support platform, a grinding part positioning device, and a swing head grinding actuator. The grinding part support platform is installed above the front end of the frame. The grinding part positioning device is installed on the grinding part support platform and consists of two symmetrically arranged guide ruler units. Each guide ruler unit consists of a guide ruler and a guide ruler position adjustment mechanism connected to the back of the guide ruler. The guide rulers of the two guide ruler units are set at a 90° angle, and the front of the two guide rulers respectively contact the two sides of the welding part of the grinding part to achieve positioning of the grinding part. The swing head grinding actuator includes an annular sanding belt, a sanding belt drive mechanism for supporting and driving the annular sanding belt, a swing bracket, a left and right movement drive mechanism connected to the swing bracket, and a left and right sway drive mechanism connected to the swing bracket. The swing bracket, the left and right movement drive mechanism, and the left and right sway drive mechanism together constitute a left and right reciprocating swing actuator, which drives the front end of the annular sanding belt to achieve left and right reciprocating swing motion. The sanding belt drive mechanism includes a driving sanding belt pulley at the rear and two driven sanding belt pulleys on the left and right sides at the front. The driving sanding belt pulley is a large pulley, and the two driven sanding belt pulleys are small pulleys. The lower end of the driving sanding belt pulley is driven and connected to a sanding belt pulley drive motor. The two driven sanding belt pulleys are rotatably connected to the left and right sides of the swing bracket. The annular sanding belt is wrapped around the outer surface of the driving sanding belt pulley and the two driven sanding belt pulleys in the front-back direction. The left-right movement drive mechanism includes a front support frame, a rear support frame, and a front support frame drive mechanism. The front support frame comprises an upper support arm and a lower support arm arranged parallel to each other vertically, and a rear connecting plate connecting the rear parts of the upper and lower support arms. The front ends of the upper support arm and the lower support arm are rotatably connected to the top center and the bottom center of the swing bracket, respectively, via bearings, and the rotation centers of the upper and lower supports are located on the same axis. The rear support frame is located at the rear of the front support frame, and the lower end of the rear support frame is fixedly connected to the support platform at the upper end of the middle of the frame. The upper part of the rear support frame is provided with a guide slot along the left-right direction, and a guide roller assembly is slidably installed in the guide slot. The guide roller assembly is perpendicularly connected to the rear part of the upper support arm. The front support frame drive mechanism is located entirely below the front support frame and is used to realize the left-right reciprocating motion of the front support frame. The front support frame drive mechanism includes a front drive shaft, a front drive disc, left and right sliding blocks, and left and right sliding guide rods. The front drive shaft is rotatably and vertically mounted at the front of the support platform. A front drive wheel is fixedly connected to the lower end of the front drive shaft for power input, and the upper end of the front drive shaft is coaxially and fixedly connected to the front drive disc. A front eccentric shaft extends upward and outward from the upper end of the front drive disc. The left and right sliding blocks are slidably connected above the front drive disc via two left and right sliding guide rods. The left and right ends of the two left and right sliding rods are respectively supported on guide rod supports on the left and right sides, and the two guide rod supports are fixed to the support platform at the upper middle part of the frame. A guide groove along the front-rear direction is formed at the lower end of the left and right sliding blocks. The guide groove forms an insert guide fit with the guide roller fixed on the front eccentric shaft. The upper end of the left and right guide blocks is fixedly connected to the lower support arm of the front support frame. The left and right oscillation drive mechanism includes a rear drive shaft, a rear drive disc, a front and rear moving slider, a front and rear moving guide rod, a rack, a gear, a first oscillation drive arm, and a second oscillation drive arm. The rear drive shaft is rotatably and vertically mounted at the rear of the support platform. A rear drive wheel is fixedly connected to the lower end of the rear drive shaft for power input. The upper end of the rear drive shaft is coaxially and fixedly connected to the rear drive disc, and a rear eccentric shaft extends upward and outward from the upper end of the rear drive disc. The front and rear moving slider is slidably connected above the rear drive disc via two left and right front and rear moving guide rods. The front and rear ends of the two front and rear moving rods are respectively supported on guide rod supports on the front and rear sides, and the two guide rod supports are fixed to the support platform at the upper middle part of the frame. The rear movable slider has a guide groove along the left-right direction, which forms an insert guide engagement with the guide roller fixed on the rear eccentric shaft; the rack is fixed above the rear movable slider along the front-back direction; the gear is fixed to the upper end of the gear shaft, which is vertically rotatably mounted above the support platform, and the gear and rack form a tooth mesh; one end of the first swing drive arm is fixedly connected to the gear shaft, and the other end of the first swing drive arm is rotatably connected to the rear end of the second swing drive arm along the vertical direction axis; the front end of the second swing drive arm is rotatably connected to the bottom plate of the swing bracket near the left and right sides along the vertical direction axis.

2. The swing head belt sander according to claim 1, characterized in that: The straightedge position adjustment mechanism includes a straightedge fixing frame, an adjusting screw, a screw guide block, a screw mating block, and a screw locking component. The front end of the straightedge fixing frame is fixedly connected to the back of the straightedge, and the rear end of the straightedge fixing frame is connected to the front end of the adjusting screw in a manner that limits its axial position and allows it to rotate circumferentially. The screw guide block is fixed to the grinding workpiece support platform and is located behind the straightedge fixing frame. A screw through hole is provided on the screw guide block, forming a clearance fit with the adjusting screw. A threaded hole is vertically connected to the upper part of the screw guide block corresponding to the position of the screw through hole, and a screw locking component is connected in the threaded hole. The screw mating block is fixed to the grinding workpiece support platform and is located behind the screw guide block. A threaded hole is provided on the screw mating block, forming a threaded connection with the adjusting screw. A knob is fixed to the rear end of the adjusting screw.

3. The swing head belt sander according to claim 1, characterized in that: The abrasive belt drive motor is vertically fixedly mounted on a motor mounting plate that can be moved back and forth; the lower end of the motor mounting plate is connected to the upper mounting surface of the frame through two sets of left and right linear guide rail pairs; a rear baffle is fixedly connected to the rear of the motor mounting plate, and a tensioning cylinder connected to the frame applies a backward thrust to the rear baffle, pushing the motor mounting plate and the active abrasive belt wheel backward to achieve tensioning of the annular abrasive belt.

4. The swing head belt sander according to claim 1, characterized in that: The front drive disc is a combined structure of a front cover, a middle disc body, and a rear cover. An eccentric adjustment groove is provided in the middle of the middle disc body along the front-rear direction. The front eccentric shaft consists of a lower adjustment block and an upper shaft. The adjustment block is fitted into the eccentric adjustment groove with a clearance fit. The upper shaft is threaded near the lower adjustment block. By installing washers and locking nuts, the front eccentric shaft is tightened after adjustment. A threaded hole is provided on the front eccentric adjustment shaft along the front-rear direction. A first adjustment screw is connected in the threaded hole. The front end and the position near the rear end of the first adjustment screw are respectively rotatably supported by the front cover and the rear cover. An adjustment cap is connected to the rear end of the first adjustment screw. A scale mark is provided radially on the upper end of the middle disc body outside the eccentric adjustment groove. The 0 point of the scale mark is close to the center of the middle disc body.

5. The swing head belt sander according to claim 1, characterized in that: The rear drive disc is a combination of a left end cover, a middle disc body, and a right end cover. An eccentric adjustment groove is provided in the center of the middle disc body along the left-right direction. The rear eccentric shaft consists of a lower adjustment block and an upper shaft. The lower adjustment block of the rear eccentric shaft is fitted into the eccentric adjustment groove on the rear drive disc with a clearance fit. The upper shaft of the rear eccentric shaft has threads near the lower adjustment block, and a shim and lock nut are used to secure the rear eccentric shaft after adjustment. A threaded hole is provided in the lower adjustment block of the rear eccentric shaft along the left-right direction, and a second adjustment screw is connected to the threaded hole. The right end and the position near the left end of the second adjustment screw are respectively rotatably supported by the right end cover and the left end cover. An adjustment cap is connected to the left end of the second adjustment screw. A scale mark is provided radially on the upper end of the central disc body of the rear drive disc, outside the eccentric adjustment groove, with the 0 point of the scale mark close to the center of the middle disc body of the rear drive disc.

6. The swing head belt sander according to claim 1, characterized in that: A drive belt is connected between the front drive wheel and the rear drive wheel. The drive belt is tensioned by a tensioning mechanism. The lower end of the front drive shaft or the lower end of the rear drive shaft is connected to a reducer. The reducer is connected to a swing drive motor. The swing drive motor is installed below the support platform at the upper middle part of the frame.

7. The swing-head belt sander according to claim 1, characterized in that: The swing-head belt sander also includes a support platform vertical movement drive mechanism, comprising a drive execution mechanism and a drive guide mechanism. The drive guide mechanism includes two guide rods on each side and a guide rod slide that cooperates with each guide rod. The upper ends of the two guide rods on the left are vertically and fixedly connected to the lower part of the grinding support platform near the left front-rear position. The guide rod slides that cooperate with the two guide rods on the left are fixedly installed on the left side wall of the front part of the frame. The upper ends of the two guide rods on the right are vertically and fixedly connected to the lower part of the grinding support platform near the right front-rear position. The guide rod slides that cooperate with the two guide rods on the right are fixedly installed on the right side wall of the front part of the frame. The drive execution mechanism includes a vertical movement drive motor and a lead screw and nut mechanism. The vertical movement drive motor is connected to the lead screw via a reducer. The lead screw is supported on a lead screw support fixed below the support platform. The nut is fixedly connected to a vertical support plate. The vertical support plate is guided and installed on the front side plate below the support platform in the vertical direction. The upper end of the guide support plate is fixedly connected to the lower end of the support platform.

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