A desktop thick flat sanding mechanism and solid wood processing equipment

Abstract

The application provides a desktop thick flat sanding mechanism and solid wood processing equipment, and belongs to the technical field of wood sanding. Specifically, the mechanism comprises a driving roller, a first driven roller, an adhesive tape, a second driven roller, a sanding belt, and a position conversion structure. The first driven roller and the second driven roller are arranged in parallel and at intervals with the driving roller. The adhesive tape is wrapped around the driving roller and the first driven roller. The sanding belt is wrapped around the driving roller and the second driven roller. The position conversion structure comprises a quarter circular arc rack, a sliding seat, a gear, and a first driver. One end of the quarter circular arc rack is vertically corresponding to the position of the first driven roller in parallel. The other end of the quarter circular arc rack is horizontally corresponding to the position of the driving roller in parallel. The sliding seat is limited to slide on the quarter circular arc rack. The gear is rotatably arranged on the sliding seat and is meshingly connected with the rack gear on the quarter circular arc rack. The first driven roller is rotatably arranged on the sliding seat. The first driver is drivingly connected with the gear. The application realizes fine grinding and coarse grinding functions through the deformation of the sanding mechanism, and reduces the size of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wood sanding, in particular to a desktop thick and flat sanding mechanism and solid wood processing equipment. BACKGROUND

[0002] The sanding process improves the smoothness, flatness and dimensional accuracy of the wood surface by reducing or eliminating defects on the wood surface, and is an important link to improve the surface quality of solid wood.

[0003] At present, the belt sanding mechanism mainly includes a contact roller sanding mechanism and a sanding pad sanding mechanism. The former tightens the sanding belt on the upper and lower rollers, and one of the rollers presses the workpiece for grinding. This kind of sanding mechanism relies on the roller to press the workpiece, the contact area is small, the unit pressure is large, and it is mainly used for rough grinding or fixed thickness sanding. The latter tightens the sanding belt to the workpiece through the sanding pad for grinding. The unit pressure of this kind of sanding mechanism is small, the contact area with the workpiece is large, and it is mainly used for fine grinding or semi-fine grinding.

[0004] In order to improve the sanding efficiency and simultaneously carry out fine grinding and rough grinding of wood, the contact roller sanding mechanism and the sanding pad sanding mechanism are usually combined and arranged on the workpiece feeding route in the solid wood processing equipment. However, this configuration will increase the volume of the solid wood processing equipment, and has high requirements for transportation and operation space. When the production process changes, the position of the equipment cannot be adjusted in time. SUMMARY

[0005] Therefore, the present application aims to provide a desktop thick and flat sanding mechanism and solid wood processing equipment, which realizes the functions of fine grinding and rough grinding through the deformation of one sanding mechanism, and solves the problem of large volume occupied by the belt sanding mechanism in the prior art.

[0006] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0007] In a first aspect, the present application provides a desktop thick flat sanding mechanism, comprising a driving roller, a first driven roller, an adhesive tape, a second driven roller, a sanding belt, a position conversion structure, the first driven roller is arranged in parallel and spaced apart from the driving roller, the adhesive tape is wrapped around the driving roller and the first driven roller, the second driven roller is arranged in parallel and spaced apart from the driving roller, the sanding belt is wrapped around the driving roller and the second driven roller, and the sanding belt surrounds the first driven roller, the position conversion structure is used to adjust the relative position of the first driven roller and the driving roller, the position conversion structure comprises a quarter circular arc rack, a sliding seat, a gear, and a first driver, one end of the quarter circular arc rack corresponds to the position of the driving roller vertically in parallel, the other end of the quarter circular arc rack corresponds to the position of the driving roller horizontally in parallel, the sliding seat is limited to slide on the quarter circular arc rack, the gear is rotatably arranged on the sliding seat and is connected with the rack gear on the quarter circular arc rack, the first driven roller is rotatably arranged on the sliding seat, and the first driver is drivingly connected with the gear to drive the gear to rotate.

[0008] In addition, the desktop thick flat sanding mechanism according to the above-mentioned application can also have the following additional technical features:

[0009] Further, the position conversion structure further comprises a quarter circular arc guide rail corresponding to the position of the quarter circular arc rack, the quarter circular arc guide rail is provided with parallel sliding surfaces in the extension direction, and the sliding seat is provided with oppositely arranged rollers clamping the quarter circular arc guide rail and respectively abutting against the two sliding surfaces.

[0010] Further, the second driven roller comprises a roller frame, three roller shafts rotatably arranged on the roller frame, and a floating locking mechanism, the centers of the three roller shafts are distributed in a triangular manner, the adhesive tape is sequentially wound on the peripheral surfaces of the three roller shafts, the middle roller shaft is located below the remaining two roller shafts, and the floating locking mechanism is drivingly connected with the middle roller shaft; wherein, during the movement of the first driven roller, the floating locking mechanism drives the middle roller shaft to move up and down on the roller frame, and when the first driven roller moves from the vertical position to the position horizontally flush with the driving roller, the floating locking mechanism locks the middle roller shaft.

[0011] Further, one end of the quarter-circle arc rack is provided with a contact sensor, the floating locking mechanism comprises a shell, a piston, a slide rod, a balance assembly, the shell is fixedly connected with the roller frame, the shell is provided with a sealed cavity, a filling port and a slide port which are in communication with the sealed cavity, the filling port is used for connecting a pressure medium conveying device, the slide port is located at the bottom of the sealed cavity, the piston is slidably arranged in the sealed cavity and slides up and down, the slide rod is correspondingly arranged in the shape of the slide port, one end of the slide rod is connected with the piston, the other end of the slide rod extends out of the sealed cavity and is connected with the intermediate roller shaft, and the balance assembly is used for keeping the piston in a balanced state under the action of force when the sealed cavity is not filled with the pressure medium from the filling port.

[0012] Further, the slide port is a stepped port, the balance assembly comprises oppositely arranged first and second springs, two ends of the first spring are connected with the top wall of the sealed cavity and the upper surface of the piston respectively, two ends of the second spring are connected with the slide port and the lower surface of the piston respectively, and when the piston is in the balanced position, the sum of the downward elastic force of the first spring and the gravity of the piston and the slide rod is equal to the upward elastic force of the second spring.

[0013] Further, the roller frame is provided with a sliding block, and the intermediate roller shaft is rotatably arranged on the sliding block, and the sliding block is connected with the slide rod.

[0014] Further, a plurality of pressing pad assemblies are arranged between the driving roller and the first driven roller, the pressing pad assembly comprises a floating roller, a connecting frame and a reset mechanism, the floating roller is in contact with one end of the adhesive tape away from the second driven roller, the end of the floating roller is rotatably arranged on the connecting frame, the connecting frame is rotatably arranged on the sliding block, and the reset mechanism is arranged between the connecting frame and the sliding block to provide a restoring force for preventing the floating roller from moving away from the balanced position.

[0015] Further, the reset mechanism comprises two positioning columns and a torsion spring, the two positioning columns are arranged on the sliding block, and the two positioning columns are located on the two sides of the rotation center of the connecting frame, the torsion spring is sleeved on the rotation shaft of the connecting frame and the sliding block, and the two ends of the torsion spring are respectively abutted against the two positioning columns.

[0016] Further, the desktop thickness flat sanding mechanism further comprises a reciprocating swing mechanism, the reciprocating swing mechanism comprises a swing frame, two swing rods, an arc-shaped swing arm, an inclined block and a second driver, the swing frame is rotationally arranged around a vertical center axis, the same side ends of the two swing rods are rotationally arranged at two ends of the swing frame respectively, the other ends of the two swing rods are rotationally arranged at two ends of the second driven roller respectively, the two ends of the arc-shaped swing arm are rotationally connected to the swing frame, and the rotation center line of the arc-shaped swing arm is parallel to the rotation center line of the second driven roller, the inclined block is rotationally connected to the arc-shaped swing arm, and the second driver is in transmission connection with the inclined block to drive the inclined block to rotate, wherein the rotation center line of the inclined block is arranged at an acute angle with the rotation center line of the second driver when the inclined block rotates.

[0017] In the second aspect, the application further provides a solid wood processing equipment applying the desktop thickness flat sanding mechanism.

[0018] The application has at least the following beneficial effects: the sanding frame composed of the driving roller, the first driven roller, the adhesive tape, the second driven roller and the sanding belt is deformed by the position conversion structure, so that the two sanding frame structure forms can be freely switched, and the fine grinding and coarse grinding functions can be freely switched, thus the two sanding frame structure forms do not need to be simultaneously installed on the solid wood processing equipment, the occupied volume of the equipment is reduced, and the conversion efficiency is improved since the adhesive tape is always in a tension state during the rotation of the first driven roller. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a first perspective view of the desktop thickness flat sanding mechanism in an embodiment of the application;

[0020] Figure 2 FIG. 2 is a second perspective view of the desktop thickness flat sanding mechanism in an embodiment of the application; Figure 1 FIG. 3 is an enlarged view of part A in FIG. 2;

[0021] Figure 3 FIG. 4 is a partial structural schematic view of the desktop thickness flat sanding mechanism in an embodiment of the application;

[0022] Figure 4 FIG. 5 is a third perspective view of the desktop thickness flat sanding mechanism in an embodiment of the application;

[0023] Figure 5 FIG. 6 is a structural schematic view of the sliding seat in an embodiment of the application;

[0024] Figure 6 FIG. 7 is a sectional view of the floating locking mechanism in an embodiment of the application;

[0025] Figure 7Structure diagram of the swing mechanism in an embodiment of the present application;

[0026] Figure 8 Structure diagram of the reset mechanism in an embodiment of the present application;

[0027] Main element symbol explanation:

[0028] Active roller 100, first driven roller 200, adhesive tape 300, second driven roller 400, roller frame 410, sliding block 411, roller shaft 420, floating locking mechanism 430, shell 431, sealed cavity 4311, filling port 4312, sliding port 4313, piston 432, sliding rod 433, balance assembly 434, first spring 4341, second spring 4342, abrasive belt 500, position conversion structure 600, quarter arc rack 610, hobbing gear 611, sliding seat 620, roller 621, gear 630, first driver 640, quarter arc guide rail 650, sliding surface 651, pressure pad assembly 700, floating roller 710, connecting frame 720, reset mechanism 730, positioning column 731, torsional spring 732, reciprocating swing mechanism 800, swing frame 810, swing rod 820, arc-shaped swing arm 830, inclined block 840, second driver 850;

[0029] The following detailed description will further describe the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The drawings show several embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0031] It should be noted that when an element is referred to as being "fixedly attached" to another element, it can be directly on the other element or there can be intervening elements. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can be present. As used herein the terms "vertical", "horizontal", "left", "right", and the like are merely for purposes of illustration.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] In the first aspect, refer to Figures 1 to 8 A desktop thick flat sanding mechanism provided by the present application comprises a driving roller 100, a first driven roller 200, an adhesive tape 300, a second driven roller 400, a sanding belt 500 and a position conversion structure 600.

[0034] Specifically, the driving roller 100 is used to connect an external driving device, which can be installed on a workbench so that the driving roller 100 rotates. The first driven roller 200 is arranged in parallel with the driving roller 100 at intervals, and the second driven roller 400 is also arranged in parallel with the driving roller 100 at intervals. The adhesive tape 300 is wound around the driving roller 100 and the first driven roller 200, and the sanding belt 500 is wound around the driving roller 100 and the second driven roller 400, and the sanding belt 500 surrounds the first driven roller 200.

[0035] In the first structural form, the driving roller 100, the first driven roller 200 and the second driven roller 400 are parallel in the vertical direction, and the rotational center lines of the three are in the same vertical plane. The adhesive tape 300 is tensioned by the first driven roller 200 and the driving roller 100, and the sanding belt 500 is tensioned by the second driven roller 400 and the driving roller 100. At the same time, the sanding belt 500 and the adhesive tape 300 run at the same speed and in the same direction under the driving force provided by the driving roller 100, so that there is no relative sliding between the sanding belt 500 and the adhesive tape 300. When sanding the surface of wood, the driving roller 100 presses the wood for grinding.

[0036] The position conversion structure 600 is used to adjust the relative position of the first driven roller 200 and the driving roller 100. Specifically, the position conversion structure 600 comprises a quarter circular arc rack 610, a sliding seat 620, a gear 630, a first driver 640, the left end of the quarter circular arc rack 610 is parallel to the position of the driving roller 100, and the quarter circular arc rack 610 is arranged in position alignment with the driving roller 100 in the vertical direction, the right end of the quarter circular arc rack 610 is parallel to the position of the driving roller 100, and the quarter circular arc rack 610 is arranged in position alignment with the driving roller 100 in the horizontal direction. The sliding seat 620 is slidingly arranged on the quarter circular arc rack 610 and is limited on the quarter circular arc rack 610 to prevent the sliding seat 620 from falling off the quarter circular arc rack 610, a row of gear teeth 611 is arranged on the circumferential extension path of the quarter circular arc rack 610, the gear 630 is rotatably arranged on the sliding seat 620, and the gear 630 is meshingly connected with the gear teeth 611 on the quarter circular arc rack 610, the first driven roller 200 is rotatably arranged on the sliding seat 620, and the first driver 640 is drivingly connected with the gear 630. When the first driver 640 is in a working state, the first driver 640 drives the gear 630 to rotate, the rotation of the gear 630 drives the sliding seat 620 to move as a whole on the gear teeth 611, so that the sliding seat 620 can move from the left end of the quarter circular arc rack 610 to the right end of the quarter circular arc rack 610, or can move from the right end of the quarter circular arc rack 610 to the left end of the quarter circular arc rack 610. Optionally, the first driver 640 can be a rotary motor, a rotary cylinder, a rotary hydraulic cylinder or the like power device.

[0037] After the position conversion structure 600 is adjusted to the second structural form, the positions of the driving roller 100 and the second driven roller 400 do not change, and the driving roller 100, the first driven roller 200 and the second driven roller 400 are still in a parallel state, but at this time the rotation center line of the first driven roller 200 and the driving roller 100 is in the same horizontal plane, the adhesive tape 300 is tensioned by the first driven roller 200 and the driving roller 100, the abrasive belt 500 is tensioned by the driving roller 100, the first driven roller 200 and the second driven roller 400, and at the same time the abrasive belt 500 and the adhesive tape 300 run at the same speed and in the same direction under the driving force provided by the driving roller 100, so that there is no relative sliding between the abrasive belt 500 and the adhesive tape 300. When sanding the surface of the wood, the abrasive belt 500 tensioned between the driving roller 100 and the first driven roller 200 presses the wood for grinding.

[0038] In the embodiment, the structure of the sand frame composed of the driving roller 100, the first driven roller 200, the adhesive tape 300, the second driven roller 400 and the abrasive belt 500 is deformed by the position conversion structure 600, so that the two types of sand frame structures can be switched freely, and the fine grinding and coarse grinding functions can be switched freely. Thus, the two types of sand frame structures do not need to be installed on the solid wood processing equipment at the same time, and the occupied volume of the equipment is reduced.

[0039] In some optional embodiments, in order to limit the sliding seat 620 on the circular arc rack at all times and prevent the sliding seat 620 from falling off the quarter circular arc rack 610, a quarter circular arc guide rail 650 is arranged on the end surface of the quarter circular arc rack 610. Figure 5 As shown in the figure, the position conversion structure 600 further comprises a quarter circular arc guide rail 650. Specifically, the quarter circular arc guide rail 650 is arranged on the end surface of the quarter circular arc rack 610, and the upper and lower ends of the quarter circular arc guide rail 650 are provided with sliding surfaces 651, the two sliding surfaces 651 are parallel to each other, and the extension paths of the two sliding surfaces 651 are also parallel to the extension path of the gear teeth 611. The sliding seat 620 is provided with upper and lower symmetrically or asymmetrically arranged rollers 621, which are clamped between the quarter circular arc guide rail 650 when assembled, and abut on the two sliding surfaces 651 respectively. When the sliding seat 620 moves on the quarter circular arc rack 610, the rollers 621 roll along the sliding surfaces 651. It can be understood that the middle part of the roller 621 can be concave relative to the two ends, and the sliding surface 651 is correspondingly arranged as a convex sliding surface, so that the roller 621 will not move off the sliding surface 651 when moving on the sliding surface 651. Of course, the middle part of the roller 621 can also be convex relative to the two ends, and the sliding surface 651 is correspondingly arranged as a concave sliding surface.

[0040] During the rotation of the first driven roller 200, the circumference around the driving roller 100, the first driven roller 200 and the second driven roller 400 changes. In order to change the two types of sand frame structures without disassembling the abrasive belt 500, the length of the abrasive belt 500 needs to be changed correspondingly. Therefore, in some optional embodiments, as shown in the figure, Figure 3As shown, the second driven roller 400 comprises a roller frame 410, three roller shafts 420 rotatably arranged on the roller frame 410, and a floating locking mechanism 430. Specifically, the centers of the three roller shafts 420 are in a triangular distribution, the middle roller shaft 420 is located below the remaining two roller shafts 420, and the adhesive tape 300 is sequentially wound around the peripheral surfaces of the three roller shafts 420. It should be noted that the triangular distribution can be an equilateral triangle, an isosceles triangle, or other triangles, but the abrasive belt 500 should be able to smoothly pass through the three roller shafts 420. The floating locking mechanism 430 is in driving connection with the middle roller shaft 420. During the movement of the first driven roller 200, the floating locking mechanism 430 drives the middle roller shaft 420 to move up and down on the roller frame 410. When the middle roller shaft 420 moves up and down, the length of the abrasive belt 500 wrapped therearound changes, thereby avoiding the abrasive belt 500 from blocking the rotation of the first driven roller 200. In addition, when the first driven roller 200 moves from the vertical position to the position horizontally flush with the driving roller 100, the floating locking mechanism 430 can lock the middle roller shaft 420. At this time, the tension of the abrasive belt 500 no longer changes, unless the relative positions among the driving roller 100, the first driven roller 200, and the second driven roller 400 are further changed.

[0041] In some optional embodiments, the right end of the quarter-circular arc rack 610 is provided with a contact sensor (not shown in the drawings). Optionally, the contact sensor can be a pressure sensor, a capacitive sensor, a photoelectric sensor, or the like. As shown in the figure, Figure 2 、 Figure 6 As shown, the floating locking mechanism 430 comprises a housing 431, a piston 432, a sliding rod 433, and a balance assembly 434. The housing 431 is fixedly connected with the roller frame 410. The housing 431 is internally provided with a sealed cavity 4311, a filling port 4312, and a sliding port 4313. The filling port 4312 and the sliding port 4313 are in communication with the sealed cavity 4311. In use, the filling port 4312 is used to connect a pressure medium conveying device. The pressure medium conveying device injects or extracts pressure medium into or out of the sealed cavity 4311 through the filling port 4312. The sliding port 4313 is located at the bottom of the sealed cavity 4311. The piston 432 is slidably arranged in the sealed cavity 4311 and can slide up and down in the sealed cavity 4311. Optionally, a sealing ring (not shown in the drawings) can be arranged between the piston 432 and the cavity wall of the sealed cavity 4311 to prevent the pressure medium from leaking from the edge of the piston 432. The sliding rod 433 is correspondingly arranged in the shape of the sliding port 4313. One end of the sliding rod 433 is connected with the piston 432, and the other end of the sliding rod 433 extends from the sliding port 4313 to the outside of the sealed cavity 4311. The part of the sliding rod 433 located outside the sealed cavity 4311 is connected with the middle roller shaft 420.

[0042] In the embodiment, when the pressure medium is not filled into the sealed cavity 4311 from the filling port 4312, the piston 432 is in a state of balance of upward and downward forces, so in the process that the first driven roller 200 moves from the vertical position to the position horizontally level with the driving roller 100, when the circumferences around the driving roller 100, the first driven roller 200 and the second driven roller 400 become larger, the intermediate roller shaft 420 is driven by the sand belt 500 to move upward on the roller frame 410, and then the sliding rod 433 is driven to move upward in the sliding port 4313, the upward movement of the sliding rod 433 drives the piston 432 to move upward in the sealed cavity 4311, and the sand belt 500 will not be too tight or loose under the action of the balancing assembly 434; similarly, when the circumferences around the driving roller 100, the first driven roller 200 and the second driven roller 400 become smaller, the piston 432 is driven to move downward in the sealed cavity 4311 under the action of the balancing assembly 434, and then the sliding rod 433 is driven to move downward in the sliding port 4313, the downward movement of the sliding rod 433 drives the intermediate roller shaft 420 to move downward on the roller frame 410, until the sand belt 500 will not be too tight or loose under the action of the balancing assembly 434. In addition, when the sliding seat 620 abuts against the contact sensor, the pressure medium conveying device fills the pressure medium into the sealed cavity 4311, so that the piston 432 remains in a fixed state, that is, the piston 432 cannot move upward and downward in the sealed cavity 4311; when the sliding seat 620 is away from the sensor, the pressure medium conveying device extracts the pressure medium filled in the sealed cavity 4311.

[0043] In some optional embodiments, as shown in Figure 6 The sliding port 4313 is a stepped port, the large end of the sliding port 4313 is at the top, and the small end of the sliding port 4313 is at the bottom, and correspondingly, the sliding rod 433 is also arranged in a stepped shape, the thin rod body of the sliding rod 433 is arranged in the small end of the sliding port 4313, and the thick rod body of the sliding rod 433 is arranged in the large end of the sliding port 4313. The balancing assembly 434 includes oppositely arranged first springs 4341 and second springs 4342, wherein the number of the first springs 4341 can be set to be multiple, the upper and lower ends of the first springs 4341 are connected with the top wall of the sealed cavity 4311 and the upper surface of the piston 432 respectively, and the number of the second springs 4342 can also be set to be multiple, the upper and lower ends of the second springs 4342 are connected with the large end of the sliding port 4313 and the lower surface of the piston 432 respectively. When the driving roller 100, the first driven roller 200 and the second driven roller 400 are in the position parallel in the vertical direction, the piston 432 is in a balanced position, at this time, the sum of the downward elastic force of the first springs 4341 and the gravity of the piston 432 and the sliding rod 433 is equal to the upward elastic force of the second springs 4342.

[0044] In some optional embodiments, in order to make the intermediate roller shaft 420 move more stably upward and downward, as shown in Figure 2As shown in the drawings, the roller frame 410 is provided with a sliding block 411, and the middle roller shaft 420 is rotatably arranged on the sliding block 411, and the sliding block 411 is connected with the sliding rod 433. In this way, the up-down movement of the sliding rod 433 drives the sliding block 411 to move up and down on the roller frame 410, and in turn drives the middle roller shaft 420 to move up and down.

[0045] In order to press the adhesive tape 300 against the sand belt 500, so that the adhesive tape 300 and the sand belt 500 do not slide relative to each other, and at the same time the sand belt 500 can grind the uneven wood board, when the first driven roller 200 moves from the vertical position to the position horizontally flush with the driving roller 100, in some optional embodiments, as shown in the drawings, Figure 1 、 Figure 4 As shown in the drawings, a plurality of pressure pad assemblies 700 are arranged between the driving roller 100 and the first driven roller 200. Specifically, the pressure pad assembly 700 includes a floating roller 710, a connecting frame 720, and a reset mechanism 730. The floating roller 710 is pressed against the inner surface of the end of the adhesive tape 300 away from the second driven roller 400, and the end of the floating roller 710 is rotatably arranged on the connecting frame 720. The connecting frame 720 is rotatably arranged on the sliding seat 620, and the reset mechanism 730 is arranged between the connecting frame 720 and the sliding seat 620. When the floating roller 710 moves away from its equilibrium position, the reset mechanism 730 provides a reverse restoring force, so that when the uneven wood board is sanded, the floating roller 710 moves up and down near its equilibrium position, and at the same time the floating roller 710 rotates relative to the connecting frame 720, which can make the adhesive tape 300 smoothly slide on the floating roller 710. It should be noted that the equilibrium position of the floating roller 710 can be set according to actual conditions. For example, when a larger grinding amount is required, the equilibrium position of the floating roller 710 can be adjusted to increase the downward pressure on the adhesive tape 300 and the sand belt 500.

[0046] In some optional embodiments, as shown in the drawings, Figure 8 The reset mechanism 730 includes two positioning columns 731 and a torsional spring 732. Specifically, the two positioning columns 731 are fixedly installed on the sliding seat 620, and the two positioning columns 731 are respectively located on both sides of the rotation center of the connecting frame 720. The torsional spring 732 is sleeved on the rotation shaft of the connecting frame 720 and the sliding seat 620, and the two ends of the torsional spring 732 are respectively abutted against the two positioning columns 731. In this embodiment, when the floating roller 710 moves up and down near its equilibrium position, the floating roller 710 drives the connecting frame 720 to rotate relative to the sliding seat 620. At this time, the ends of the torsional spring 732 are blocked by the positioning columns 731 and cannot rotate, so that the torsional spring 732 generates an elastic force to resist the continuous rotation of the connecting frame 720. In this way, through the floating of the floating roller 710, the uneven wood board is effectively adapted, so that the convex part is subjected to increased downward pressure, ensuring that the convex part has a larger grinding amount when sanded, and in turn ensuring the precision of fine grinding.

[0047] During the rotation of the sanding belt 500, it may deviate from its designated path on the driving roller 100, the first driven roller 200, and the second driven roller 400. Therefore, in some alternative embodiments, such as... Figure 4 , Figure 7 As shown, the desktop thick sanding mechanism also includes a reciprocating swing mechanism 800. The reciprocating swing mechanism 800 swings the second driven roller 400 left and right on the horizontal plane. The second driven roller 400 swings left and right and generates a lateral force on the sanding belt 500. This force can counteract the tendency of the sanding belt 500 to deviate due to various reasons, so that the sanding belt 500 is not easy to deviate. Specifically, the reciprocating swing mechanism 800 includes a swing frame 810, two swing rods 820, an arc-shaped swing arm 830, an inclined block 840, and a second driver 850. The swing frame 810 is rotatably mounted around a vertical central axis. It should be noted that the vertical central axis refers to the central axis perpendicular to the plane in which the second driven roller 400 swings horizontally. The same-side ends of the two swing rods 820 are rotatably mounted at both ends of the swing frame 810, and the other ends of the two swing rods 820 are rotatably mounted at both ends of the second driven roller 400. Both ends of the arc-shaped swing arm 830 are rotatably connected to the swing frame 810, and the rotation center line of the arc-shaped swing arm 830 is parallel to the rotation center line of the second driven roller 400. The inclined block 840 is rotatably connected to the arc-shaped swing arm 830, and the second driver 850 is drively connected to the inclined block 840. When the second driver 850 is in operation, it drives the tilting block 840 to rotate. As the tilting block 840 rotates, its rotation center line forms an acute angle with the rotation center line of the second driver 850. At this time, the tilting block 840 drives the arc-shaped swing arm 830 to rotate back and forth on the swing frame 810, and simultaneously drives the arc-shaped swing arm 830 to swing left and right. The left and right swing of the arc-shaped swing arm 830 causes the swing frame 810 to rotate clockwise and counterclockwise, which in turn causes the second driven roller 400 to swing left and right via the two swing rods 820. Optionally, the second driver 850 can be a rotary motor, rotary cylinder, rotary hydraulic cylinder, or other power device.

[0048] It should be noted that in order to keep the position of the second driven roller 400 relatively fixed, the roller frame 410 can be movably mounted on the worktable. In this way, when the reciprocating swing mechanism 800 is working, the two ends of the roller frame 410 can swing in the horizontal direction, thereby driving the two ends of the second driven roller 400 to swing in the horizontal direction.

[0049] Secondly, the present invention also provides a solid wood processing device that utilizes the aforementioned tabletop thick sanding mechanism.

[0050] In summary, by deforming the structure of the sand frame composed of the driving roller 100, the first driven roller 200, the adhesive tape 300, the second driven roller 400 and the abrasive belt 500 through the position conversion structure 600, the free switching of the two types of sand frame structures can be realized, and then the free switching of the fine grinding and coarse grinding functions can be realized, so that the sand frame of the two types of structures does not need to be installed on the solid wood processing equipment at the same time, and the occupied volume of the equipment is reduced; at the same time, since the adhesive tape 300 is always in a tension state during the rotation of the first driven roller 200, the position of the adhesive tape 300 does not need to be adjusted after the structure is deformed, so that the transformation efficiency is improved.

[0051] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0052] The above-described embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A desktop thickness sander characterized by, The desktop thick flat sanding mechanism comprises: a driving roller; a first driven roller, which is arranged in parallel with the driving roller at intervals; an adhesive tape, which is wrapped around the driving roller and the first driven roller; a second driven roller, which is arranged in parallel with the driving roller at intervals; a sanding belt, which is wrapped around the driving roller and the second driven roller and surrounds the first driven roller; a position conversion structure, which is used to adjust the relative position of the first driven roller and the driving roller, and comprises a quarter circular arc rack, a sliding seat, a gear, and a first driver, one end of the quarter circular arc rack corresponds to the position of the driving roller vertically in parallel, the other end of the quarter circular arc rack corresponds to the position of the driving roller horizontally in parallel, the sliding seat is limited to slide on the quarter circular arc rack, the gear is rotatably arranged on the sliding seat and is connected with the rack gear on the quarter circular arc rack in meshing, the first driven roller is rotatably arranged on the sliding seat, and the first driver is in transmission connection with the gear to drive the gear to rotate; the position conversion structure further comprises a quarter circular arc guide rail, which corresponds to the position of the quarter circular arc rack, and parallel sliding surfaces are arranged on the extension direction of the quarter circular arc guide rail, and opposite rollers are arranged on the sliding seat and clamp the quarter circular arc guide rail and abut against the two sliding surfaces respectively; the second driven roller comprises a roller frame, three roller shafts rotatably arranged on the roller frame, and a floating locking mechanism, the centers of the three roller shafts are distributed in a triangular manner, the adhesive tape is sequentially wound on the peripheral surfaces of the three roller shafts, the middle roller shaft is located below the remaining two roller shafts, and the floating locking mechanism is in transmission connection with the middle roller shaft; in the movement process of the first driven roller, the floating locking mechanism drives the middle roller shaft to move up and down on the roller frame, and when the first driven roller moves from the vertical position to the position horizontally flush with the driving roller, the floating locking mechanism locks the middle roller shaft; the desktop thick flat sanding mechanism further comprises a reciprocating swing mechanism, which comprises: a swing frame, which is rotatably arranged around a vertical center axis; two swing rods, the same side ends of the two swing rods are rotatably arranged at the two ends of the swing frame respectively, and the other ends of the two swing rods are rotatably arranged at the two ends of the second driven roller respectively; an arc-shaped swing arm, which is rotatably connected to the swing frame at both ends, and the rotation center line of the arc-shaped swing arm is parallel to the rotation center line of the second driven roller; an inclined block, which is rotatably connected to the arc-shaped swing arm; a second driver, which is in transmission connection with the inclined block to drive the inclined block to rotate; wherein, when the inclined block rotates, the rotation center line of the inclined block is arranged at an acute angle with the rotation center line of the second driver.

2. The desktop drum sander as defined in claim 1, wherein, one end of the quarter circular arc rack is provided with a contact sensor, and the floating locking mechanism comprises: A housing is fixedly connected to the roller frame, and a sealed cavity is arranged in the housing. A filling port and a sliding port are arranged in communication with the sealed cavity. The filling port is used to connect a pressure medium conveying device. The sliding port is arranged at the bottom of the sealed cavity. A piston is arranged in the sealed cavity and slides up and down. A slide rod is arranged in correspondence with the sliding port. One end of the slide rod is connected to the piston, and the other end of the slide rod extends from the sliding port to the outside of the sealed cavity and is connected to the intermediate roller shaft. A balancing assembly is arranged to balance the piston when the sealed cavity is not filled with pressure medium from the filling port. When the sliding seat abuts against the contact sensor, the sealed cavity is filled with pressure medium to keep the piston in a fixed state.

3. The desktop thickness sander according to claim 2, wherein, The sliding port is a stepped port. The balancing assembly includes oppositely arranged first and second springs. The two ends of the first spring are respectively connected to the top wall of the sealed cavity and the upper surface of the piston. The two ends of the second spring are respectively connected to the sliding port and the lower surface of the piston. When the piston is in a balanced position, the sum of the downward elastic force of the first spring and the gravity of the piston and the slide rod is equal to the upward elastic force of the second spring.

4. The desktop thickness sander of claim 3, wherein, A sliding block is arranged on the roller frame. The intermediate roller shaft is rotatably arranged on the sliding block. The sliding block is connected to the slide rod.

5. The desktop drum sander as defined in claim 1, wherein, A plurality of pressing pad assemblies are arranged between the driving roller and the first driven roller. The pressing pad assembly includes: A floating roller contacts one end of the adhesive tape away from the second driven roller. A connecting frame is rotatably arranged on the sliding seat. An end of the floating roller is rotatably arranged on the connecting frame. A reset mechanism is arranged between the connecting frame and the sliding seat to provide a restoring force to prevent the floating roller from moving away from the balanced position.

6. The desktop drum sander as defined in claim 5, wherein, The reset mechanism includes: Two positioning columns are arranged on the sliding seat. The two positioning columns are respectively arranged on the two sides of the rotation center of the connecting frame. A torsional spring is sleeved on the rotation shaft of the connecting frame and the sliding seat. The two ends of the torsional spring abut against the two positioning columns, respectively.

7. A solid wood processing apparatus, characterized by The tabletop thick and flat sanding mechanism is applied.

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