An automatic turnover polishing device for chopping board production

Abstract

The application discloses an automatic overturning and polishing device for chopping board production, which comprises a rack, a reciprocating table, a conformal supporting assembly, a sanding assembly and an overturning assembly. The conformal supporting assembly is composed of a lifting frame, a multi-stage pressure equalizing swing rod and a supporting block. The supporting block is attached to the local lower surface of the chopping board blank when the overall height of the lifting frame is controlled. After the first large surface of the chopping board blank is sanded, the overturning assembly is clamped around the middle surface of the thickness from the two side plates, the supporting assembly is lowered to leave a sweeping space, and the two overturning shafts are synchronously turned by 180 degrees. The supporting block reholds the blank after the surface is turned, the clamping jaw is released, and the reciprocating table passes through the same sand belt in the opposite direction to complete the processing of the other large surface. The structure reduces the sanding deviation of the warped blank after being rigidly flattened, and limits the contact of the processed large surface to the edge area of the plate.

Description

Technical Field

[0001] This invention relates to the field of daily-use wood product processing equipment technology, specifically to an automatic flipping sanding device for double-sided sanding of wooden cutting board blanks. Background Technology

[0002] Wooden cutting boards are typically made from solid wood or spliced ​​wood planks through processes such as sawing, thickness setting, sanding, chamfering, grooving, and surface treatment. For cutting boards that come into direct contact with food, the flatness and surface roughness of the two main surfaces not only affect the appearance and feel but also the processing benchmarks for subsequent steps such as creating drainage grooves, handle holes, and applying wood wax oil. Therefore, after the cutting board blank is sawed and initially thickness-set, both main surfaces are usually sanded separately.

[0003] During wood processing, the moisture content distribution, grain direction, and splicing stress of the blank are not entirely consistent. Even if the overall thickness of the blank is within the allowable range, it may still warp slightly when placed freely, and the thickness of blanks from the same batch may also vary. If such blanks are directly pressed onto a rigid surface for sanding, the pressure applied by the sanding belt will initially make the blank temporarily flat; after the pressure is released, the blank returns to its original shape, and the actual cutting depth of the sanding belt in different areas will change accordingly, easily leaving local sanding marks or resulting in inconsistent removal amounts.

[0004] To reduce manual flipping, existing equipment has proposed various automatic flipping structures for wood boards. For example, the wood sander disclosed in Publication No. CN206416038U has a lifting and clamping mechanism above the conveying device. After one side of the wood board is sanded, it is clamped, lifted, and rotated before being conveyed to the next sanding position. The wood sanding device disclosed in Publication No. CN119347594A switches the support plates and clamps located on the upper and lower sides of the wood when the flipping frame rotates, so that the large surface to be sanded can be exposed. These solutions can achieve flipping, but their focus is mainly on the clamping, lifting, and rotating actions themselves.

[0005] The dimensions of a cutting board blank are smaller than large-format boards such as door panels, but its thickness is relatively large, and the edges are often rounded in subsequent processes. If the flipping mechanism clamps directly onto the large surface, clamping marks may be left on the already sanded surface; if only the sides are clamped and the flipping axis is not centered with the thickness, changes in thickness will cause the blank's center of gravity to shift relative to the flipping axis, increasing the impact during flipping. On the other hand, after the blank is flipped and placed back on the rigid worktable, it is equivalent to re-establishing a support reference, making it difficult to maintain consistent sanding conditions on the two large surfaces. Although using two sets of sanding components can process the two surfaces separately, it increases the equipment footprint and introduces the problem of adjusting the sanding height of the two sets separately.

[0006] Therefore, a sanding device for wooden cutting board blanks is needed, which can adapt the supporting structure to the slight warping of the blank in its free state, complete the edge clamping and flipping of the board without contacting the processed surface with a small area, and make the two large surfaces before and after the flipping pass through the same sanding reference. Summary of the Invention

[0007] The purpose of this invention is to provide an automatic flipping and sanding device for cutting board production, in order to solve the problems that slightly warped wooden cutting board blanks are prone to uneven sanding under rigid support, that flipping and clamping may damage the processed surface, and that it is difficult to unify the reference of the dual sanding components.

[0008] To achieve the above objectives, this device uses a frame as its mounting base, on which a reciprocating table capable of back-and-forth movement is installed. The support area of ​​the reciprocating table does not use a single rigid plate; instead, multiple support blocks distribute the support for the raw cutting board. These support blocks are connected to a lifting frame via multi-stage pressure-equalizing swing arms. When local height differences occur on the lower surface of the cutting board, the swing arms rotate within a defined angle. The first support block to contact transmits the load to the same group of fulcrums, and the other support blocks subsequently engage. The lifting frame is responsible for determining the overall height of the support surface, while the swing arms only compensate for local unevenness; therefore, their respective adjustment tasks are not intertwined.

[0009] The sanding assembly is located above the reciprocating table's movement path. The drive roller and tension roller hold the sanding belt in operation, while the pressure plate supports the working section from the back of the sanding belt. A height adjustment mechanism sets the relative position of the pressure plate to the supporting surface. As the reciprocating table moves from the loading side to the flipping side, the first large surface of the cutting board blank passes over the sanding belt; after flipping, the reciprocating table reverses direction, and the second large surface passes over the same sanding belt again. The processing height is set at only one location, eliminating the need to re-establish a reference point between the two sanding heads during shape changes and maintenance.

[0010] The flipping position is located downstream of the sanding assembly. Flipping seats are located on both sides of the frame, and the clamping slides on the flipping seats can simultaneously move towards the center of the reciprocating table under the action of forward and reverse lead screws. The clamping slides move the flipping shafts and clamping forks. After cutting board blanks of different widths enter the flipping position, the two clamping forks can still maintain symmetry relative to the center line of the reciprocating table. The two flipping shafts are connected by a synchronous transmission rod, and a single flipping drive component can make the clamping forks on both sides rotate in the same direction and angle.

[0011] Each clamping fork is equipped with an upper and lower clamping jaw. A two-way clamping linkage ensures that the two jaws close synchronously around the flipping axis, so that the clamping center remains close to the mid-thickness surface of the cutting board even when the thickness of the cutting board changes. The elastic pads on the surface of the jaws extend along the edge of the board, and the clamping force is distributed in a narrow area, which not only limits the relative sliding of the cutting board during flipping but also avoids the main usable area in the center of the large surface.

[0012] Once the first surface is sanded, the reciprocating table moves the blank between the two clamping forks. The clamping slide is first aligned in the width direction, and then the upper and lower jaws close from the upper and lower sides of the plate edge. After the clamping force is established, the lifting drive causes the lifting frame to descend, and all support blocks retract outside the sweeping envelope of the blank. The flipping drive then drives the two flipping shafts to rotate synchronously 180 degrees. After the flipping shafts stop, the lifting frame rises, and the support blocks catch the blank from below again, and the swing arm adapts to the new lower surface; the jaws only open after the lifting frame is in the support position. The blank does not fall freely during the transfer from the clamping forks to the support blocks, and the support after flipping is not forcibly straightened by a single rigid plane.

[0013] As a further feature, foldable end stops are arranged at both ends of the reciprocating table. When the cutting board blank enters the reciprocating table, the feed-side stop can be pushed outward. After the blank is fully inserted, the stop automatically returns to its original position. The two stops together restrict the blank's movement in the reciprocating direction. The stops cooperate with the support blocks to prevent the drag force of the abrasive belt from being directly converted into displacement of the blank relative to the reciprocating table.

[0014] Compared with the prior art, the present invention has the following beneficial effects: First, the multi-stage pressure equalizing swing rod divides the support block into a group of fulcrums that can compensate for each other. The sanding pressure is transmitted to the lifting frame through multiple contact points, so the blank does not need to be flattened by the entire table first. The warping and rebound after the pressure is released are less likely to cause local areas to be over-sanded or under-sanded.

[0015] Secondly, the two clamping slides approach each other simultaneously in the width direction, and the upper and lower jaws clamp the edge of the plate with the same stroke. The rotation axis remains in the middle of the clamping area as the width and thickness of the blank change. The elastic pad only occupies a narrow strip on the edge of the plate, and the center of the sanded surface does not need to bear the clamping force.

[0016] Third, the clamping, supporting descent, flipping, re-supporting, and release are completed in a fixed sequence. When the support block descends, it is connected to the clamping fork; after the support block rises, it is reconnected to the blank. The flipping space and handover process are all controlled by the structural position.

[0017] Fourth, the reciprocating table passes through the same sanding belt and pressure plate in opposite directions before and after the flipping process, and the two large surfaces use the same processing height relationship. The equipment reduces one set of sanding heads, and belt changing and height adjustment are completed in the same working area. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a front view of the device of the present invention; Figure 3 This is a top view of the device of the present invention; Figure 4This is a partial structural diagram of the sanding area in the device of the present invention; Figure 5 This is a partial structural diagram of the flipping clamping area in the device of the present invention; Figure 6 This is another partial structural schematic diagram of the device of the present invention; Figure 7 This is a combined front and top view schematic diagram of the device of the present invention.

[0019] In the diagram: 30. Cutting board blank; 1. Frame; 2. Reciprocating table; 3. Linear guide rail; 4. Reciprocating drive component; 5. Lifting frame; 6. Support column; 7. Pressure equalizing swing arm; 8. Support block; 9. Return spring; 10. Lifting drive component; 11. Sanding belt frame; 12. Drive roller; 13. Tensioning roller; 14. Sanding belt; 15. Sanding plate; 16. Height adjustment component; 17. End stop; 18. Tilting seat; 19. Tilting shaft; 20. Tilting drive component; 21. Synchronous transmission rod; 22. Clamping slide; 23. Positive and negative lead screws; 24. Centering drive component; 25. Clamping fork; 26. Upper jaw; 27. Lower jaw; 28. Bidirectional clamping linkage component; 29. ​​Elastic pad. Detailed Implementation

[0020] The structure and operation of the present invention will be further described below with reference to the accompanying drawings. The drawings are used to illustrate the assembly, movement, and relative positional relationships between the components, and the same reference numerals indicate the same component. For ease of description, the direction in which the reciprocating table moves from the loading side to the tilting assembly is taken as the forward direction, and the direction perpendicular to the moving direction of the reciprocating table and located between its two sides is taken as the width direction. Figures 4 to 6 All from Figure 1 The corresponding area is selected and magnified in the same assembly state shown. Figure 7 Both front and top views are generated from the same assembly state; partial views only change the observation range, without changing the number of parts, connection positions, or motion relationships.

[0021] Example 1 like Figure 1 and Figure 2 As shown, the frame 1 is constructed from profiles or a welded frame, with two parallel linear guide rails 3 arranged on the upper part of the frame 1 along the forward direction. The reciprocating table 2 straddles the two linear guide rails 3, and a slider that mates with the linear guide rails 3 is provided at its bottom. The reciprocating drive 4 is located on one side of the frame 1 and can be a servo motor with a rack and pinion mechanism, or an electric cylinder or a synchronous belt linear module. In this embodiment, the reciprocating drive 4 meshes with a rack arranged along the frame 1 via gears, and the drive motor is mounted on the reciprocating table 2, thus enabling the reciprocating table 2 to move continuously between the loading position, sanding position, and flipping position. The specific stroke of the reciprocating drive 4 is determined by the length of the cutting board blank 30, the width of the working section of the sanding belt 14, and the location of the flipping assembly.

[0022] An opening is formed in the middle of the reciprocating table 2, and the lifting frame 5 is installed in this opening. The lifting frame 5 is connected to the reciprocating table 2 through multiple vertical guide pairs. The lifting drive 10 is located at the lower part of the reciprocating table 2, and its output end is connected to the lifting frame 5. The lifting drive 10 can be an electric push rod, a cylinder, or a hydraulic cylinder; for wood processing environments with a lot of dust, a dust cover is installed on the telescopic part of the drive, and the guide pairs are located on the outside of the dust-collecting airflow. After the lifting frame 5 is raised to the working position, the guide pairs bear the lateral force, and the drive mainly provides vertical thrust and position holding.

[0023] Combination Figure 3 Several support columns 6 are distributed on the lifting frame 5. The upper end of each support column 6 is connected to an upper-level pressure equalizing swing rod 7 via a transverse pin. The two ends of the upper-level pressure equalizing swing rod 7 are respectively connected to lower-level pressure equalizing swing rods 7. Support blocks 8 are set at both ends of the lower-level pressure equalizing swing rods 7, so that one support column 6 can correspond to four support points. Multiple support columns 6 are distributed along the length and width of the cutting board blank 30, and the upper surfaces of the support blocks 8 together form a support surface.

[0024] The equalizing rocker arm 7 swings at a small angle only in the vertical plane, while the support column 6 restricts the remaining degrees of freedom. When a certain area of ​​the lower surface of the cutting board blank 30 first contacts the support block 8, the support block 8 pushes the lower equalizing rocker arm 7 to deflect, and the deflection is distributed to the other support blocks 8 in the same group via the upper equalizing rocker arm 7. Thus, the support blocks 8 in the same group do not need to have exactly the same extension height, and can still contact the lower surface of the blank while keeping the overall height of the lifting frame 5 unchanged. The swing angle of the upper and lower rocker arms is limited by the limiting surfaces on both sides of the pin shaft to prevent it from tipping over when unloaded or exceeding the stable support range after being subjected to force.

[0025] The return spring 9 can be a torsion spring located at the pivot pin, or a tension spring connecting the equalizing pivot 7 to the adjacent support structure. After the cutting board blank 30 is removed or the lifting frame 5 is lowered, the return spring 9 pulls each equalizing pivot 7 to a near-horizontal intermediate position, facilitating the entry of the next blank. The upper surface of the support block 8 is provided with a replaceable wear-resistant elastic layer, which has sufficient friction to limit the movement of the wood board without damaging the wood surface under sanding pressure. The support block 8 and the equalizing pivot 7 are detachably connected and can be replaced from above the lifting frame 5 after wear.

[0026] like Figure 6 As shown, the reciprocating table 2 is located below the sanding assembly, and the cutting board blank 30 is placed in the support area of ​​the reciprocating table 2. A conformal support assembly is installed within the reciprocating table 2. The support block 8 transmits the support reaction force to the lifting frame 5 through the equalizing swing rod 7 and the support column 6, and the lifting drive component 10 drives the lifting frame 5 to rise and fall as a whole. The swing of the equalizing swing rod 7 is used to adapt to local height differences on the lower surface of the blank. The clamping relationship of the flipping assembly to the edge of the cutting board blank 30 is as follows: Figure 5 As shown.

[0027] like Figure 2 and Figure 4 As shown, the sanding assembly spans the movement path of the reciprocating table 2. The sanding belt frame 11 is fixed above the machine frame 1. The drive roller 12 and tension roller 13 are rotatably mounted at both ends of the sanding belt frame 11, and the annular sanding belt 14 is wound around the outside of the two rollers. The drive roller 12 is driven by a sanding motor, and the tension roller 13 adjusts the initial tension of the sanding belt 14 using a conventional tensioning structure. A pressure plate 15 is installed on the back of the working section of the sanding belt between the drive roller 12 and the tension roller 13. The pressure plate 15 is connected to the sanding belt frame 11 via a height adjustment component 16.

[0028] In this embodiment, the height adjustment component 16 adopts a four-point synchronous lead screw lifting structure. Each lead screw is synchronously driven by the same handwheel or reduction motor, keeping the sanding plate 15 parallel to the reciprocating table 2. After the height adjustment is completed, the position is maintained by a locking component. The side of the sanding plate 15 near the sanding belt 14 is provided with a low-friction wear-resistant layer, and its two ends are made into a smooth transition to prevent abnormal bending of the sanding belt 14 at the edge of the sanding plate 15 during operation. For cutting board blanks 30 of different thicknesses, only the distance between the working position of the sanding plate 15 and the lifting frame 5 needs to be adjusted, without changing the structure of the flipping shaft 19.

[0029] After the initial assembly of the equipment or replacement of the sanding belt 14, calibration blocks of uniform thickness can be placed on the reciprocating table 2, and the lifting frame 5 can be locked at the working height. The gaps between the two ends and the middle of the pressure plate 15 and the calibration blocks are checked sequentially, and the parallelism of the pressure plate 15 is corrected using the height adjustment component 16. This calibration only determines the overall height of the sanding working section relative to the lifting frame 5, without forcing each support block 8 to the same contact position. After the blank is inserted, the equalizing swing rod 7 still redistributes the support reaction force according to the local undulations of the lower surface. Thus, the sanding reference of the equipment is determined by the pressure plate 15 and the lifting frame 5, and the slight height difference of the lower surface of the blank is absorbed by the support blocks 8 within a limited swing angle; the two adjustments do not substitute for each other.

[0030] To prevent excessively warped blanks from entering the flipping process, a mechanical stroke check can be set according to the allowable height difference of the support blocks 8. If a set of equalizing pendulum rods 7 has reached the limiting surface but the adjacent support blocks 8 still cannot contact the blank, it indicates that the warping of the blank exceeds the current setting range of this equipment, and it should be returned to the thickness setting or shaping process before sanding. This judgment is based on whether the pendulum rods have reached the structural limit, and it is not necessary to write unverified warping values ​​into the device control logic, nor is it necessary to rely on continuing to increase the sanding pressure to forcibly flatten abnormal blanks.

[0031] End stops 17 are installed at both ends of the reciprocating table 2 along the forward direction. The end stops 17 are hinged to the reciprocating table 2 via a transverse shaft, on which a torsion spring is mounted to keep the stop upright. During loading, the cutting board blank 30 can be pushed into the reciprocating table 2 from one end and press down the corresponding stop; after the blank passes, the stop rises again under the action of the torsion spring. The distance between the two end stops 17 is slightly greater than the length of the target cutting board and can be adjusted through elongated holes on the reciprocating table 2. During sanding, the front and rear stops bear drag forces in different directions, keeping the blank relative to the support block 8 within a defined area.

[0032] like Figure 1 and Figure 3 As shown, the flipping assembly is located downstream of the sanding assembly. The frame 1 has flipping seats 18 fixed on both sides of the reciprocating table 2. Each of the two flipping seats 18 has a guide structure extending along its width, and the clamping slides 22 slide in cooperation with this guide structure. Positive and negative lead screws 23 are arranged across the reciprocating table 2, with their two ends rotatably supported by the flipping seats 18. The two sides of the middle section of the lead screws have threads with opposite directions of rotation. The two clamping slides 22 are connected to the corresponding threaded sections. When the centering drive 24 drives the positive and negative lead screws 23 to rotate, the two clamping slides 22 move closer to or further away from the centerline of the reciprocating table 2 with the same displacement.

[0033] Each clamping slide 22 is rotatably mounted with a tilting shaft 19, and the two tilting shafts 19 are arranged coaxially. The tilting drive 20 is mounted on one of the clamping slides 22 and connected to the corresponding tilting shaft 19. The synchronous transmission rod 21 is located below the reciprocating table 2 along the width direction. Its main body adopts a telescopic structure with a spline sleeve and a spline shaft. Its two ends are connected to the two tilting shafts 19 through a bevel gear pair or a synchronous belt reversing structure, respectively. When the clamping slides 22 change their spacing, the synchronous transmission rod 21 extends or retracts accordingly. After the tilting drive 20 is started, the torque can still be transmitted to the other tilting shaft 19, so that the two clamping forks 25 rotate synchronously.

[0034] The inner end of the flip shaft 19 is fixed with a clamping fork 25. (See reference...) Figure 5 The clamping fork 25 is frame-shaped with an opening facing the cutting board blank 30. The upper clamping jaw 26 and the lower clamping jaw 27 are vertically slidably disposed within the clamping fork 25. The bidirectional clamping linkage 28 is disposed on the side of the clamping fork 25 facing away from the blank. It can be a symmetrical upper and lower linkage driven by a horizontal push rod, or a bidirectional wedge with opposite inclined surfaces. In this embodiment, a bidirectional wedge is used: when the wedge moves forward, its upper and lower inclined surfaces push the upper clamping jaw 26 and the lower clamping jaw 27 closer to the center, respectively; when the wedge moves backward, the jaws move in opposite directions under the action of the return spring. The strokes of the two jaws are equal, and the axis of the flipping shaft 19 is located within the symmetrical midplane of the jaw's range of motion.

[0035] An elastic pad 29 is installed on the facing side of the upper jaw 26 and the lower jaw 27. The elastic pad 29 is made of abrasion-resistant elastic material, and its length along the edge of the cutting board is greater than its width along the larger surface. After clamping, the pad only covers a narrow area near the edge of the board and does not enter the central cutting area of ​​the cutting board. The compressibility of the pad is used to absorb local thickness differences at the edge of the board, and the jaw body is still restricted by the guide surface of the clamping fork 25 to avoid significant swaying during flipping.

[0036] When the device starts working, the lifting frame 5 is at the working height, and each equalizing lever 7 returns to approximately the center under the action of the return spring 9. The operator or the preceding conveying mechanism sends the cutting board blank 30 to the reciprocating table 2, and the end stop 17 completes the longitudinal limit. The weight of the blank causes some of the support blocks 8 to contact the lower surface first, and the equalizing lever 7 adjusts with the contact position until multiple support blocks 8 share the load.

[0037] Once the sanding belt 14 reaches the set speed, the reciprocating drive 4 moves the reciprocating table 2 to the flipping position. The cutting board blank 30 passes under the pressure plate 15, and the sanding belt 14 sands the first large surface facing upwards. The sanding pressure is transmitted sequentially from the pressure plate 15 to the sanding belt 14, the cutting board blank 30, the support block 8, the pressure equalizing swing rod 7, the support column 6, and the lifting frame 5. Because the support block 8 can distribute the support reaction force according to the local height of the lower surface of the blank, the slight warping will not bear all the pressure only at the highest point of the rigid table.

[0038] After the first large surface leaves the sanding belt 14, the reciprocating table 2 stops in the flipped position, and the cutting board blank 30 is positioned between the two clamping forks 25. The centering drive 24 drives the forward and reverse lead screws 23, causing the two clamping slides 22 to approach synchronously until the clamping forks 25 enter the edges of the blank on both sides. The bidirectional clamping linkage 28 then actuates, and the upper jaw 26 and lower jaw 27 close synchronously around the axis of the flipping shaft 19. After the elastic pad 29 presses against the edge of the blank, the flipping load is taken over by the clamping forks 25.

[0039] After clamping is confirmed, the lifting drive 10 lowers the lifting frame 5. During descent, the support blocks 8 sequentially detach from the cutting board blank 30, and the return spring 9 returns the pressure equalizing swing rod 7 to the middle position. The lifting frame 5 continues to descend until all support blocks 8 are below the sweeping envelope of the cutting board blank 30. The flipping drive 20 then drives the two flipping shafts 19 to rotate synchronously by 180 degrees. The grippers close around the thickness mid-surface, so changes in the blank thickness do not directly create an eccentricity of equal magnitude; the synchronous rotation of the two gripping forks 25 also suppresses the twisting of the blank during the flipping process.

[0040] After the flipping shaft 19 reaches the 180-degree position, it stops and remains there, while the lifting drive 10 drives the lifting frame 5 to rise. The support block 8 approaches the flipped blank from below, and the pressure equalizing swing arm 7 deflects again according to the new lower surface shape. When the lifting frame 5 reaches the preset support height and is held by the lifting drive 10, the bidirectional clamping linkage 28 then drives the upper jaw 26 and lower jaw 27 to release, and the clamping slide 22 then retracts outward. This sequence of actions prevents the cutting board blank 30 from falling directly from the jaws onto the support surface.

[0041] Combination Figure 7 The reciprocating drive 4 reverses its direction, and the reciprocating table 2 returns the flipped cutting board blank 30 to the loading side. The second large surface passes under the same sanding belt 14 and pressure plate 15 in the opposite feed direction to the first large surface. The two surfaces share the same height setting of the pressure plate 15, and the sanding belt wear condition remains continuous. After the second large surface is sanded, the reciprocating table 2 returns to the loading and unloading position, and the operator or unloading mechanism removes the cutting board.

[0042] Example 2 This embodiment is used to process rectangular spliced ​​cutting boards with different widths and thicknesses on the same equipment. Compared with Embodiment 1, the overall relationship of the frame 1, reciprocating table 2, conformal support assembly, sanding assembly and flipping assembly remains unchanged. The difference is that before changing the shape, the initial distance between the clamping slides 22 on the two flipping seats 18 is adjusted according to the width of the target cutting board, and the working height of the sanding plate 15 and the opening range of the upper and lower clamps are adjusted according to the target thickness.

[0043] During the changeover, the reciprocating table 2 stops at the loading position, and the centering drive 24 moves the two clamping slides 22 to a preparatory position larger than the target cutting board width. After placing a calibration blank of the same specification on the support block 8, the clamping slides 22 approach at low speed until the elastic pads 29 on both sides contact the edge of the board. This position of the positive and negative lead screws 23 is recorded as the clamping starting point for this batch, and then the bidirectional clamping linkage 28 completes the vertical clamping. Since the two clamping slides 22 are driven by the same positive and negative lead screws 23, the width change will not cause the center of the cutting board to deviate from the common axis of the two flipping shafts 19.

[0044] To address thickness variations, the height adjustment component 16 first lifts the pressure plate 15 away from the support surface, then gradually lowers it based on the blank calibration. Once the pressure plate 15 reaches the desired processing position, it is locked, and the height adjustment component 16 remains stationary throughout the same batch. The initial distance between the upper jaw 26 and the lower jaw 27 is adjusted to be slightly greater than the blank thickness. The bidirectional clamping linkage 28 still ensures that the two jaws approach each other with the same stroke, preventing the clamping center from shifting to a specific surface due to thickness variations.

[0045] Different wooden strips on the spliced ​​cutting board may create slight height differences on the lower surface. The multi-stage pressure equalizing lever 7 allows adjacent support blocks 8 to contact their corresponding wooden strip areas. During sanding pressure, the reaction force is redistributed among the support blocks 8 in the same group through the rotation of the lever, preventing a single protruding wooden strip from becoming the main fulcrum. If a support block 8 is worn or wood chips adhere to the elastic layer, it can be replaced individually from the end of the pressure equalizing lever 7 without removing the lifting frame 5.

[0046] In this embodiment, a cover connected to the workshop dust removal pipeline can also be installed on the outside of the sanding belt frame 11, with the suction inlet of the cover facing the position where the sanding belt 14 leaves the cutting board blank 30. The dust removal structure does not participate in supporting and turning the blank, and its size and air volume are selected according to the existing dust removal system in the workshop. To prevent sawdust from entering the pin shafts of the linear guide rail 3, the positive and negative lead screws 23, and the pressure equalizing swing rod 7, telescopic dust covers and detachable scrapers can be installed at the corresponding positions. These protective components do not change the above-mentioned core action relationship.

[0047] In other embodiments, the reciprocating drive 4, lifting drive 10, tilting drive 20, and centering drive 24 can be selected as electric, pneumatic, or hydraulic according to the equipment cycle time; the synchronous transmission rod 21 can also be replaced by a two-sided synchronous servo drive, but it should be ensured that the two tilting shafts 19 maintain the same angle of rotation when clamping the cutting board blank 30. The number of stages of the equalizing swing rod 7 and the number of each set of support blocks 8 can be adjusted according to the area of ​​the cutting board, as long as the multiple support blocks 8 can still distribute the local support reaction force under the condition that the overall height of the lifting frame 5 is controlled.

[0048] The above embodiments are used to illustrate the structural relationships and working process of the present invention. For those skilled in the art, without changing the combined action of reciprocating abrasive belt processing, conformal support descent and avoidance, and clamping and flipping of the plate edge thickness mid-surface, equivalent adjustments can be made to the drive form, the number of swing arms, the jaw profile, and the dustproof structure.

Claims

1. An automatic flipping and sanding device for cutting board production, comprising a frame (1), a reciprocating table (2), a sanding assembly, and a flipping assembly, characterized in that: The reciprocating table (2) is slidably mounted on the frame (1) via a linear guide rail (3) and connected to a reciprocating drive component (4); The reciprocating table (2) is provided with a lifting frame (5) that is driven to move vertically by a lifting drive (10). The lifting frame (5) is provided with several support columns (6). Several pressure equalizing swing rods (7) are rotatably arranged on the support columns (6). Multiple support blocks (8) at the ends of the pressure equalizing swing rods (7) together form a conformal support surface for supporting the cutting board blank (30). The sanding assembly includes a sanding belt frame (11) located above the moving path of the reciprocating table (2), a sanding belt (14) and a sanding plate (15) provided on the sanding belt frame (11), with the sanding plate (15) located on the side of the sanding belt (14) facing away from the cutting board blank (30). The flipping assembly is located downstream of the sanding assembly along the forward stroke of the reciprocating table (2), and includes a flipping seat (18) disposed on both sides of the reciprocating table (2) and a flipping shaft (19) rotatably supported on the flipping seat (18). The two flipping shafts (19) are connected by a synchronous transmission rod (21), and at least one is connected to a flipping drive component (20). The two flipping shafts (19) are respectively provided with clamping forks (25) at their opposite ends. The upper jaw (26) and lower jaw (27) of the clamping forks (25) move synchronously towards or away from each other around the thickness of the cutting board blank (30) to clamp or release the edge of the board. The axis of the flipping shaft (19) is located in the symmetrical mid-plane of the two jaws. The lifting drive (10) drives the lifting frame (5) to descend after the two grippers clamp, so that the support block (8) exits the flipping sweeping envelope of the cutting board blank (30), and drives the lifting frame (5) to rise after flipping 180 degrees. After the support block (8) supports the cutting board blank (30) again, the two grippers are released. The reciprocating drive (4) drives the reciprocating table (2) to move back and forth along the cutting board conveying direction before and after flipping, so that the two large surfaces of the cutting board blank (30) pass through the same sand belt (14) in opposite directions.

2. The automatic flipping and polishing device for cutting board production according to claim 1, characterized in that: The equalizing rocker arm (7) is divided into at least two levels, upper and lower. The middle part of the upper equalizing rocker arm (7) is rotatably connected to the support column (6), and the middle part of the lower equalizing rocker arm (7) is rotatably connected to both ends of the upper equalizing rocker arm (7). The support blocks (8) are respectively set at both ends of the lower equalizing rocker arm (7) so that multiple support blocks (8) corresponding to the same support column (6) can swing relative to each other according to the height difference of the lower surface of the cutting board blank (30).

3. The automatic flipping and polishing device for cutting board production according to claim 2, characterized in that: A return spring (9) is provided between the equalizing rocker arm (7) and the support column (6) and between two adjacent equalizing rocker arms (7). The return spring (9) is used to return the equalizing rocker arm (7) to the preset middle position when the support block (8) is removed from the cutting board blank (30). The upper surface of the support block (8) is a support surface with friction buffering capability.

4. The automatic flipping and polishing device for cutting board production according to claim 1, characterized in that: The sanding assembly also includes a drive roller (12) and a tension roller (13) rotatably mounted on the sanding belt frame (11), and the sanding belt (14) is arranged around the drive roller (12) and the tension roller (13); The sand pressing plate (15) is positioned between the drive roller (12) and the tension roller (13) and is connected to the sand belt frame (11) via a height adjustment component (16) to adjust the height of the working section of the sand belt (14) relative to the support block (8).

5. An automatic flipping and polishing device for cutting board production according to claim 1, characterized in that: The flipping seat (18) is provided in two parts, and the two flipping shafts (19) are arranged coaxially; The synchronous transmission rod (21) is a splined transmission rod that can extend and retract along the axis and transmit torque. The two ends of the synchronous transmission rod (21) are connected to two rotating shafts (19) through reversing transmission pairs, so that the two rotating shafts (19) can rotate in the same direction and at equal angles.

6. An automatic flipping and polishing device for cutting board production according to claim 5, characterized in that: Two flip seats (18) are respectively slidably provided with clamping slides (22), and two flip shafts (19) are respectively rotatably provided on the corresponding clamping slides (22); The frame (1) is rotatably provided with a positive and negative lead screw (23) that spans the reciprocating table (2). Two clamping slides (22) are respectively connected to the threaded sections with opposite directions on the positive and negative lead screws (23). The positive and negative lead screws (23) are connected to the centering drive (24) so ​​as to drive the two clamping slides (22) to move synchronously closer to or away from the center line of the reciprocating table (2) relative to the center line.

7. An automatic flipping and sanding device for cutting board production according to claim 1, characterized in that: The clamping fork (25) is provided with a bidirectional clamping linkage (28), which is connected to the upper jaw (26) and the lower jaw (27) respectively, and is used to drive the upper jaw (26) and the lower jaw (27) to move closer or further away from the axis of the flipping shaft (19) in sync, and the axis of the flipping shaft (19) is located in the symmetrical mid-plane of the upper jaw (26) and the lower jaw (27).

8. An automatic flipping and polishing device for cutting board production according to claim 7, characterized in that: Elastic pads (29) are respectively provided on the opposing clamping surfaces of the upper jaw (26) and the lower jaw (27). The elastic pads (29) extend along the edge of the cutting board blank (30) and are configured to contact only the narrow band area of ​​the cutting board blank (30) near the edge.

9. An automatic flipping and polishing device for cutting board production according to claim 1, characterized in that: The reciprocating table (2) is provided with end blocks (17) at both ends along the moving direction. The two end blocks (17) form a longitudinal limiting area for the cutting board blank (30). The end blocks (17) can be folded outward relative to the reciprocating table (2) and have an elastic reset structure that allows them to return to a working position higher than the supporting surface.

10. An automatic flipping and polishing device for cutting board production according to claim 6, characterized in that: After the clamping slide (22) completes synchronous approach and the upper clamping claw (26) and lower clamping claw (27) clamp the cutting board blank (30), the lifting frame (5) descends to the highest point of the support block (8) below the lower boundary of the sweeping envelope of the cutting board blank (30) during the flipping process. After the flipping shaft (19) flips to 180 degrees and holds, the lifting frame (5) rises to support the cutting board blank (30) on the support block (8), and then the upper jaw (26) and lower jaw (27) move in opposite directions to release the clamping, and the clamping slide (22) retracts outward.

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