An improved whole bamboo unfolding device without cracks

Abstract

An improved whole bamboo unfolding device without cracks is described. The original device's frame, upper and lower spindles are lengthened, and the upper left, lower left, and right outer casings are replaced with left and right outer casings. Three eccentric wheel shafts are removed. The device is characterized by: adding a left and right support inside the left and right supports; adding two drive shaft supports in the middle of the frame; installing two slider seats inside the left and right supports; and opening a drive shaft support hole on each of the left and right supports directly below the slider seats. The left and right drive shafts are connected by universal couplings and installed in the drive shaft support holes and drive shaft support holes. The left and right outer casings are connected to the sliders by connecting pins, and the sliders are placed in the guide grooves of the slider seats. After the bamboo tube is loaded, the hydraulic cylinder pushes the left and right outer casings to rotate around their respective connecting pins. Simultaneously, the eccentric discs on the left and right drive shafts rotate, pushing the sliders upwards. The left and right outer casings close, pressing the bamboo tube down to the spindle. The unfolding process is the same as the original invention.

Description

[0001] Technical Field: This invention belongs to the field of bamboo processing technology, and mainly relates to an improved device for unfolding whole bamboo into a crack-free bamboo flat plate after softening and slitting along the axial direction of a whole bamboo tube after removing the inner nodes, yellowing and greening.

[0002] Background Technology: Moso bamboo is an important forest resource that is fast-growing, high-yielding, high-quality, and easy to regenerate. It not only has a short growth cycle but also excellent physical and mechanical properties. However, compared to wood, bamboo has a smaller diameter, thinner and hollow walls, a larger taper, and its cross-section is mostly elliptical with varying degrees of curvature along its length. These geometric characteristics bring many problems and difficulties to its processing and utilization. Therefore, bamboo is much more difficult to process than wood, and its industrial utilization is not as widespread as that of wood, mainly in the following aspects:

[0003] (1) Low utilization rate of bamboo. The outer green layer and inner yellow layer of bamboo cannot be wetted by adhesives, and their properties differ greatly from those of the middle layer. The truly usable material in bamboo processing is mainly the middle layer of bamboo. Currently, the utilization rate of bamboo in products that can be considered highly processed, such as bamboo flooring made by splicing bamboo strips and rotary-cut thin bamboo, is less than 30%, resulting in a huge waste of bamboo resources and increasing the production cost of the products.

[0004] (2) The processing technology and methods for bamboo are not properly selected. Currently, bamboo is processed by sawing, splitting or planing, which can only produce bamboo strips with a width of 15-20 mm and a thickness of 5-7 mm, making them difficult to use directly. To obtain boards or square timber, the bamboo strips must be glued together, resulting in a large amount of glue consumption.

[0005] (3) Low equipment precision and automation level. Due to the special structure of bamboo, most bamboo processing products can only be produced by mechanization, and some processes or products still require manual labor. Many current bamboo processing equipment cannot meet production requirements and have low processing precision. Because the equipment currently in use is basically an imitation or improvement of woodworking machinery, it is not well-suited for bamboo processing. This not only affects product quality, efficiency, cost, equipment reliability, durability, and automation, but also results in low safety during production, even endangering personal safety. Therefore, the labor productivity of the bamboo processing industry is low and cannot meet the needs of modern high-quality bamboo product production.

[0006] (4) The structure of bamboo is significantly different from that of wood, and the chemical composition is also different. Bamboo contains more nutrients such as hemicellulose, starch, protein, and sugar than wood. Therefore, bamboo products are not as resistant to insects, decay, and mold as wood products.

[0007] To obtain high-quality, high-value-added products, expand the application areas of bamboo processed products, and improve the utilization rate of bamboo and its resistance to insects, decay, and mildew, it is essential to employ unique processing techniques and methods for deep processing of moso bamboo. If moso bamboo can be unfolded into crack-free bamboo flat sheets, flat sheets with a width of 250-400mm, a length of 1300-2500mm, and a thickness of 7-10mm can be obtained. These bamboo flat sheets can be used directly as decorative materials, for bamboo flooring, or sliced ​​into thin strips of varying thicknesses and glued onto various types of substrates to create composite flooring, furniture panels, engineered wood products, and other decorative materials. To achieve crack-free unfolding of the entire bamboo tube into a flat sheet, the outer green layer, bamboo nodes, and yellow inner layer must be removed. The bamboo must then be longitudinally slit, softened, and then unfolded. Currently, a representative invention patent for unfolding whole bamboo tubes into crack-free bamboo flat panels is "A Crack-Free Unfolding Device for Whole Bamboo (ZL2017105117015)". Its characteristic is that a lower spindle, an upper spindle, three eccentric wheel shafts, and sliding seats for sliding the upper left outer casing, lower left outer casing, and right outer casing are respectively mounted on the left and right supports at both ends of the frame. The upper left outer casing, lower left outer casing, and right outer casing are arranged around the lower spindle, thus forming a large semi-circular groove with variable width between the outer circle of the lower spindle and the inner arcs of the upper left outer casing, lower left outer casing, and right outer casing. The large semi-circular groove with variable width is formed by three eccentric wheel shafts arranged on the outer sides of the upper left outer casing, lower left outer casing, and right outer casing. The bamboo tube is controlled by six eccentric wheels at both ends of the mandrel shaft. Before the bamboo tube is inserted, the worm gear reducer and chain drive drive the three eccentric wheel shafts to rotate. The eccentric wheels at both ends of each eccentric wheel shaft drive the rollers and the upper left outer wrapping, lower left outer wrapping, and right outer wrapping to slide outward along the rectangular groove on the sliding seat. This makes the width of the annular groove between the outer circle of the lower mandrel and the inner arc of the upper left outer wrapping, lower left outer wrapping, and right outer wrapping larger, which facilitates the insertion of the bamboo tube. After the bamboo tube is inserted into the annular groove, the worm gear reducer and chain drive drive the three eccentric wheel shafts to reverse, causing the upper left outer wrapping, lower left outer wrapping, and right outer wrapping to slide inward along the rectangular groove on the sliding seat, pressing the bamboo tube down the mandrel so that the inner surface of the bamboo tube is attached to the outer surface of the lower mandrel.In the original invention of the whole bamboo crack-free unfolding device, due to some design defects in the unfolding device and the processing errors of various components and the deformation of welded parts, the following problems will occur in the manufacturing, debugging and use of the equipment: 1) In the original invention, the bearings that support the rotation of the upper spindle, lower spindle and three eccentric wheel shafts are all installed in the bearing holes on the left and right supports and rotate around a fixed axis. The two sliding seats that limit the sliding of the upper left outer package, lower left outer package and right outer package along the slide groove are also installed on the left and right supports. This makes it difficult for the three inner cylindrical surfaces of the upper left outer package, lower left outer package and right outer package to be on the same cylindrical surface after they are closed, or the inner cylindrical surface formed after the three inner cylindrical surfaces are closed is not concentric with the lower spindle. Therefore, during the unfolding process, 1) Increased resistance between the outer surface of the bamboo tube and the contact surfaces of the upper left, lower left, and right outer wrappings during the process caused the unfolded bamboo flat sheet to crack; 2) Since the upper left, lower left, and right outer wrappings are hollow (heat transfer oil needs to be introduced when the unfolding machine is working), considering that the inner cylindrical surfaces of the three outer wrappings are difficult to process, the three outer wrappings are generally made by cutting and welding two different diameter steel pipes; the central angle subtended by the inner circle of the upper left outer wrapping is less than 90 degrees, and the central angle subtended by the inner circle of the lower left outer wrapping is equal to 90 degrees, so it is very easy to produce twisting or warping deformation during welding. Even if welding fixtures are used, it is difficult to guarantee the quality, resulting in a large number of scraps for the upper left and lower left outer wrappings, which leads to high manufacturing costs. 3) The upper left, lower left, and right outer components are driven by six eccentric wheels on three eccentric shafts and slide in three different directions. Due to indexing errors in the three guide grooves at both ends and machining errors in parts such as the eccentric wheels, it is very difficult to adjust the inner cylindrical surfaces of the upper left, lower left, and right outer components to the same cylindrical surface during installation and debugging. Therefore, it is very difficult to debug the original equipment to an ideal state, resulting in high manufacturing costs. Furthermore, the three outer components are circulated with high-temperature heat-conducting oil, and components that have twisted or warped after welding require reshaping to meet requirements. After prolonged operation, these components are prone to deformation, greatly increasing the probability of cracks appearing in the unfolded bamboo board. Given the above shortcomings of the original invention, improvements are needed to increase the probability of crack-free unfolded bamboo boards to over 95%.

[0008] Summary of the Invention: The purpose of this invention is to provide an improved device for unfolding whole bamboo into a crack-free bamboo flat plate by opening axial slits along a whole bamboo tube after removing the inner nodes, yellowing, and greening, and then softening it.

[0009] The technical improvement of this invention is as follows: The frame, upper spindle, and lower spindle are appropriately lengthened (while maintaining the lengths of the pressure piece, support piece, and outer casing on the unfolding plate). The upper left outer casing, lower left outer casing, and right outer casing are changed to a left outer casing and a right outer casing (the inner cylindrical surface of the upper left, lower left, and right outer casing after merging is the same as the inner cylindrical surface of the left and right outer casing after merging). The three eccentric wheel shafts and the two eccentric wheels on each eccentric wheel shaft that control the sliding of the outer casing, as well as the two sliding seats that limit the sliding of the upper left, lower left, and right outer casing along the slide groove, are removed. After the improvement... The whole bamboo unfolding device without cracks includes: a left support, a copper sleeve, a slider seat, a slider, an eccentric disc, a flat key I, a roller I, a pin I, a connecting pin, a left outer casing, a drive shaft support, a driven sprocket, a flat key II, a left drive shaft, a universal coupling, a lower spindle, a right drive shaft, a rocker arm, a rocker arm support shaft, a right support, a pin II, a frame, a retaining ring I, a hydraulic cylinder, a retaining ring II, a pin III, a roller II, a screw, a right outer casing, and a bamboo tube. Its characteristic is that a left support and a right support are respectively added inside the left and right supports in the unfolding device, and two drive shaft supports are installed in the middle of the frame. Two slider seats are fixed to the inner sides of the left and right supports with four screws respectively. The guide grooves on the slider seats after installation are symmetrical to the axis of the lower spindle. A drive shaft support hole is opened on each of the left and right supports directly below the two slider seats. A copper sleeve is installed in each drive shaft support hole. The left end of the left drive shaft is placed in the copper sleeve of the drive shaft support hole on the left support, and its right end is supported by a drive shaft bracket. The right end of the right drive shaft is placed in the copper sleeve of the drive shaft support hole on the right support, and its left end is supported by a drive shaft bracket. The left and right drive shafts are connected by a universal coupling. [The last sentence appears to be incomplete and possibly refers to a different part of the design.] A blind hole is machined on each end face of the component, and a connecting pin is inserted into each blind hole. The left outer casing and the right outer casing are closed, and the other ends of the two connecting pins at each end are inserted into the two holes in the middle of the slider. Then the two sliders are placed in the guide groove of the slider seat. A rocker arm support shaft hole is machined on each side of the transmission shaft support hole on the left and right supports. One end of the rocker arm support shaft is driven into the rocker arm support shaft hole and locked with retaining ring I. The rocker arm is fitted onto the other end of the rocker arm support shaft. The other end of the rocker arm is hinged to the head of the oil cylinder piston rod with pin II, and the other end of the oil cylinder is hinged to the oil cylinder seat.

[0010] The blind holes on the end faces of the left and right outer components and the connecting pins are interference fits, while the connecting pins and the holes on the sliders are clearance fits. When the sliders at both ends slide up and down along the guide groove of the slider seat, the left and right outer components will move up and down together with the sliders at both ends. At the same time, the left and right outer components can rotate counterclockwise or clockwise around the connecting pins under their own gravity or the push of the rocker arm.

[0011] The slider has two connecting pin holes in the middle (e.g.) Figure 5As shown), a rectangular groove is provided in the middle of the bottom of the slider (as shown). Figure 6 As shown), roller I is installed into the rectangular groove via pin I. Roller I and pin I have a clearance fit. Additionally, shoulders are provided on both sides of the bottom of the slider (as shown). Figure 5 As shown), when the slider is pushed to its highest position by the eccentric disc, the shoulder at the bottom of the slider just contacts the bottom surface of the sliding seat; if the sides of the bottom of the slider are not provided with shoulders, during the unfolding of the bamboo tube, when the push key on the lower spindle rotates to the area where the right outer package is located (as shown), Figure 13 As shown in the diagram, especially when the push key rotates to the upper half of the right outer casing, the force exerted by the push key on the bamboo tube is upward, which will cause the right outer casing, connecting pin, slider, and left outer casing to move upward together. This causes a change in the distance between the inner surfaces of the left and right outer casings and the surface of the lower mandrel. Specifically, the distance between them and the bottom of the lower mandrel decreases, while the distance between the left and right sides above the lower mandrel increases. This causes the bamboo tube to bulge upward before entering the space between the upper and lower mandrels, resulting in cracking of the bamboo tube before it enters the space between the upper and lower mandrels. Therefore, the shoulders on both sides of the bottom of the slider can overcome the upward force exerted by the push key on the bamboo tube and keep the highest position of the slider unchanged. When unfolding the bamboo tube, no matter where the push key is in the area of ​​the right outer casing, the upward component of the force exerted by the push key on the bamboo tube will not cause the slider to move. This ensures that the distance between the inner surfaces of the left and right outer casings after they are closed and the outer surface of the lower mandrel remains unchanged when the bamboo tube is unfolded, providing equipment assurance for unfolding the bamboo tube into a crack-free bamboo flat plate.

[0012] After the left and right outer components are joined together, the two opposing surfaces are milled into bevels along the length direction (e.g., ...). Figure 9 As shown, when the left outer package and the right outer package rotate around their respective connecting pins, interference between the left outer package and the right outer package when they open to both sides is avoided.

[0013] The left drive shaft is equipped with an eccentric disc and a driven sprocket. A flat key I is used to fix the left drive shaft and the eccentric disc circumferentially, and a flat key II is used to fix the left drive shaft and the driven sprocket circumferentially. The right drive shaft is equipped with only an eccentric disc, and a flat key I is used to fix the right drive shaft and the eccentric disc circumferentially. When connecting the left drive shaft (14) and the right drive shaft (17) with a universal coupling (15), it must be ensured that the two eccentric discs (5) on the left and right are in phase. The two eccentric discs are installed on the left and right drive shafts directly below the sliders at both ends. The maximum value of the eccentric disc after installation is... The radial section contacts the roller installed at the bottom of the slider, while the shoulders on both sides of the bottom of the slider just contact the bottom surface of the slider seat. The slider is in the highest position. After installation and adjustment, the piston rods of the four cylinders are in the fully extended state. Under the weight of the left outer casing, the right outer casing and the connecting pin, the two sliders will slide down together along the guide groove of the sliding seat. The roller I in the bottom of the two sliders is supported by the eccentric discs installed on both sides of the left and right drive shafts. At this time, the left outer casing and the right outer casing are closed, and the distance between the inner cylindrical surface and the outer cylindrical surface of the lower mandrel is equal everywhere (that is, the axis of the inner cylindrical surface is coaxial with the lower mandrel) and is the minimum. Before the bamboo tube unfolds, the four hydraulic cylinders positioned on either side of the left and right outer casings operate simultaneously, retracting their piston rods. At the same time, the chain drive engages, with the driven sprocket driving the left and right drive shafts and eccentric discs via key II. During this process, the left and right outer casings, under gravity, move downwards with the slider while simultaneously rotating around their respective connecting pins, opening outwards. When the two eccentric discs have rotated 180 degrees and the piston rods of all four cylinders are fully retracted, the smallest radial point on the eccentric disc contacts roller I. When the slider is at its lowest position, the distance between the inner circular surfaces of the left and right outer casings and the outer cylindrical surface of the lower shaft increases to its maximum (e.g., ...). Figure 4 (As shown), thus facilitating the insertion of the bamboo tube; after the bamboo tube is loaded into the unfolding machine, the chain drive works, and the driven sprocket drives the left drive shaft and eccentric disc and the right drive shaft and eccentric disc to rotate together through the flat key II. The piston rod in the oil cylinder extends. During this process, the roller I in the slider is pushed by the eccentric disc and drives the left outer package and the right outer package to rise through the connecting pin. At the same time, the rocker arm extends with the piston rod in the oil cylinder and pushes the left outer package and the right outer package to rotate around their respective connecting pins at both ends until the two eccentric discs rotate 180 degrees and the piston rod of the oil cylinder is fully extended. The slider is at its highest position. At this time, the shoulder at the bottom of the slider is just in contact with the bottom surface of the sliding seat. The inner circular surfaces of the left outer package and the right outer package are on the same cylindrical surface and concentric with the lower mandrel. The bamboo tube is pressed down to the lower mandrel. At this time, the distance between the inner surfaces of the left outer package and the right outer package and the cylindrical surface of the lower mandrel is the minimum (as shown). Figure 2 , Figure 3 (As shown).

[0014] The sliding seat has a guide groove (e.g., a guide groove is opened in the middle along the vertical direction) in the middle. Figure 8 As shown, the slider is placed in the guide groove of the sliding seat, and the slider can slide vertically in the guide groove of the sliding seat; when installing two slider seats, it must be ensured that the guide groove is perpendicular to the horizontal plane, and the slider can slide freely up and down vertically in the guide groove of the sliding seat.

[0015] The left and right outer casings are made by cutting steel pipes of different diameters, adding a panel and a partition, and welding them together. The interior is made into a cavity, and the partition has an oil passage hole. The central angle corresponding to the arc of the end face of the improved left outer casing is greater than 120 degrees, and the central angle corresponding to the arc of the end face of the right outer casing is greater than 160 degrees. Therefore, whether the arc part is cut from the round pipe or welded, the twisting and warping deformation of the left and right outer casings is very small. If a welding fixture is used during welding, the inner circular surface of the left and right outer casings can meet the usage requirements after welding without processing or simple shaping, and no further processing is required.

[0016] Each rocker arm is equipped with an adjusting shim, and under each adjusting shim is a set of adjusting shims of different thicknesses. The adjusting shims and adjusting shims are fixed to the rocker arm with two screws. The function of setting the adjusting shims and adjusting shims is: when the piston rods of the four cylinders are in the fully extended state, the maximum radial points of the two eccentric discs are in contact with the rollers, the slider is in the highest position, and the distance between the inner circular surfaces of the left and right outer casing parts and the outer circular surface of the lower spindle is not equal, the adjusting shims are added or removed until the distance between the inner circular surfaces of the left and right outer casing parts and the outer circular surface of the lower spindle is equal everywhere.

[0017] A roller seat is welded to the outer wall of each end of the left and right outer components. Each roller seat is equipped with a pin III, and each pin III is fitted with a roller II. When the hydraulic cylinder pushes the rocker arm to rotate, the left and right outer components rotate around their respective connecting pins through the roller II, pin III, and roller seat.

[0018] The bamboo tubes mentioned are bamboo slips that have had their inner nodes, yellow and green parts removed, and have been slit along the longitudinal direction and softened.

[0019] The left outer package, right outer package, upper spindle and unfolding plate pressure piece are all provided with cavities, which are filled with heat-conducting oil.

[0020] The advantages and positive effects of this invention are as follows: 1. By adding left and right supports to the inner sides between the left and right supports respectively, the lower and upper spindles are separately supported from the pressure plate, support plate, left outer casing, right outer casing, and transmission shaft, greatly simplifying the assembly and debugging of the unfolding machine, especially making the concentricity problem of the lower spindle with the left and right outer casings easier to solve; 2. Replacing the original three long eccentric wheel shafts with two concentric short transmission shafts not only simplifies the structure but also simplifies the transmission device for driving the shaft rotation, and solves the problem of the three eccentric wheel shafts being difficult to synchronize; 3. The upper left outer casing, lower left outer casing, and right outer casing are modified... For the left and right outer components, the central angles corresponding to the arcs on the end faces of the left and right outer components are both greater than 90 degrees. This minimizes the twisting and warping deformation during cutting and welding on the steel pipe, greatly reducing the amount of waste generated in the production process. 4. Insert one end of each of the four connecting pins into the blind holes on the end faces of the left and right outer components, and insert the other end into the sliders at both ends. This will align one side of the inner cylindrical surface of the left and right outer components. Adjusting shims are provided on the rocker arm. By simply adding or removing the adjusting shims, the inner cylindrical surfaces of the closed left and right outer components can be easily made to be on the same cylindrical surface and concentric with the lower mandrel. Attached Figure Description

[0021] Figure 1 The FF sectional view mainly shows the relative positional relationships between important components such as the upper and lower spindles, outer casing, and drive shaft in the axial section of the unfolding device.

[0022] Figure 2 The AA sectional view mainly shows the relative positions of the main components at the left end of the main body of the unfolding device when the piston rod of the hydraulic cylinder is fully extended.

[0023] Figure 3 The BB sectional view mainly shows the relative positions of the main components at the right end of the main body of the unfolding device when the piston rod of the hydraulic cylinder is fully extended.

[0024] Figure 4 The AA sectional view mainly shows the situation after the cylinder piston rod is fully retracted and the transmission shaft drives the eccentric disk to rotate 180 degrees, the left outer part opens to the left and the right outer part opens to the right, and they move downward together with the slider. After this, the distance between the left and right outer parts and the lower mandrel increases.

[0025] Figure 5 This indicates the shape of the slider.

[0026] Figure 6 The DD sectional view mainly shows the internal structure of the slider.

[0027] Figure 7 This indicates the shape of the slider base.

[0028] Figure 8 EE sectional view, showing the internal structure of the slider seat.

[0029] Figure 9 This diagram illustrates the process of milling the vertical surfaces of the left and right outer components into inclined planes along their length.

[0030] Figure 10 The CC cross-sectional view shows a schematic diagram of how the left and right outer wrapping parts press the bamboo tube down to the central shaft after it is loaded into the unfolding machine.

[0031] Figure 11 The CC cross-sectional view shows the moment when the push key just touches the bamboo tube after the upper and lower spindles start to rotate.

[0032] Figure 12 The CC cross-sectional view shows a schematic diagram of the push key pushing the other side of the bamboo tube between the lower and upper mandrels during the unfolding process.

[0033] Figure 13 The CC cross-sectional view shows the push key moving into the right outer packaging area and the bamboo tube being unfolded.

[0034] Figure 14 The CC cross-sectional view shows a schematic diagram of the push key moving to the position directly below the upper spindle and the bamboo tube being fully unfolded into a crack-free bamboo flat plate.

[0035] In the diagram: 1. Left support; 2. Copper sleeve; 3. Slider seat; 4. Slider; 5. Eccentric disc; 6. Flat key I; 7. Roller I; 8. Pin I; 9. Connecting pin; 10. Left outer casing; 11. Drive shaft support; 12. Driven sprocket; 13. Flat key II; 14. Left drive shaft; 15. Universal coupling; 16. Lower spindle; 17. Right drive shaft; 18. Upper spindle; 19. Rocker arm; 20. Rocker arm support shaft; 21. Right support; 22. Pin II; 23. Frame; 24. Retaining ring I; 25. Hydraulic cylinder; 26. Retaining ring II; 27. Unfolding plate support; 28. Pin III; 29. ​​Roller II; 30. Screw; 31. Unfolding plate pressing part; 32. Push key; 33. Right outer casing; 34. Heat transfer oil; 35. Bamboo tube; 36. Whole bamboo flat plate without cracks. Detailed Implementation

[0036] The improved whole bamboo crack-free unfolding device, while keeping the lengths of the bamboo flat plate pressing component, bamboo flat plate lower support component, upper left, lower left and right outer wrapping component unchanged in the original device, appropriately lengthens the frame 23, upper spindle 19 and lower spindle 16, and changes the upper left outer wrapping component, lower left outer wrapping component and right outer wrapping component to left outer wrapping component 10 and right outer wrapping component 33 (the area covered by the outer wrapping component after closing remains basically unchanged), removes the three eccentric wheel shafts and the two eccentric wheels on each eccentric wheel shaft that control the sliding of the outer wrapping component; adds left support 1 and right support 21 to the inner side between the left support and right support in the unfolding device, respectively, installs unfolding plate support component 27 on left support 1 and right support 21, and installs unfolding plate pressing component 31 on unfolding plate support component 27; Two drive shaft supports 11 are installed in the middle of the frame 23. Two slider seats 3 are fixed to the inner sides of the left support 1 and the right support 21 with four screws 30 respectively. The guide groove on the slider seat 3 after installation is symmetrical with the axis of the lower spindle 16. A drive shaft support hole is opened on the left support 1 and the right support 21 directly below the two slider seats 3. A copper sleeve 2 is provided in each drive shaft support hole. The left end of the left drive shaft 14 is placed in the copper sleeve 2 of the drive shaft support hole on the left support 1, and its right end is supported by the drive shaft support 11. The right end of the right drive shaft 17 is placed in the copper sleeve 2 of the drive shaft support hole on the right support 21, and its left end is supported by the drive shaft support 11. The left drive shaft 14 and the right drive shaft 17 are connected by a universal coupling 15 (e.g., Figure 1 (As shown); A blind hole is machined on the end face of both ends of the left outer package (10) and the right outer package (33), and a connecting pin (9) is installed in each blind hole. The left outer package (10) and the right outer package (33) are closed, and the other ends of the two connecting pins (9) at each end are inserted into the two holes in the middle of the slider 4. Then the two sliders (4) are placed in the guide groove of the slider seat (3); A rocker arm support shaft hole is machined on each side of the transmission shaft support hole. One end of the rocker arm support shaft 20 is driven into the rocker arm support shaft hole and locked with the retaining ring I24. The rocker arm 19 is fitted into the other end of the rocker arm support shaft 20. The other end of the rocker arm 19 is hinged to the piston rod head of the oil cylinder 25, and the other end of the oil cylinder 25 is hinged to the oil cylinder seat (as shown). Figure 2 , Figure 3 (As shown).

[0037] After installation and debugging, the piston rods of the four hydraulic cylinders 25 are in the fully extended state. The maximum radial distance on the eccentric disc 5 is in contact with the roller I7. The shoulders on both sides of the bottom of the slider 4 are in contact with the bottom surface of the slider seat 3. The slider 4 is in the highest position. The distance between the inner circular surfaces of the left outer casing 10 and the right outer casing 33 and the outer surface of the lower spindle 16 is equal and minimum everywhere. The push key 32 on the lower spindle 16 is located below the unfolding plate support 27 (e.g., Figure 2(As shown); the distance between the upper spindle 18 and the lower spindle 16 and the distance between the pressure piece 31 on the unfolding plate and the support piece 27 on the unfolding plate are both L, and the value of L is less than the thickness of all the unfolded bamboo tubes; the two floating bearing seats supporting the upper spindle 18 are pressed by disc springs, and the rotating screw II adjusts the pressure of the disc springs through the pressure plate II; the upper surface of the pressure piece 31 on the unfolding plate is provided with compression springs at both ends, and the rotating screw I can adjust the pressure of the compression springs through the pressure plate I.

[0038] Before the bamboo tube 35 unfolds, the four hydraulic cylinders 25 positioned on either side of the left outer casing 10 and the right outer casing 33 operate together, retracting their piston rods. Simultaneously, the chain drive engages, with the driven sprocket 12 driving the left drive shaft 14 and eccentric disc 5, and the right drive shaft 17 and eccentric disc 5 via the flat key II 13. During this process, the left outer casing 10 and the right outer casing 33, under the influence of gravity, move downwards with the slider 4 while simultaneously rotating around their respective connecting pins 9, opening outwards. When the two eccentric discs 5 have rotated 180 degrees and the piston rods of the four hydraulic cylinders 25 are fully retracted, the smallest radial point on the eccentric disc 5 contacts the roller I7. At this point, the slider 4 is at its lowest position, and the distance between the inner circular surfaces of the left outer casing 10 and the right outer casing 33 and the outer cylindrical surface of the lower spindle 16 increases to its maximum, thus facilitating the insertion of the bamboo tube 35 (e.g., ...). Figure 4 (As shown); Upper spindle 18, lower spindle 16, and push key 32 return to... Figure 10 After reaching the indicated position, the bamboo tube 35 is loaded into the unfolding machine. The chain drive operates, and the driven sprocket 12 drives the left drive shaft 14 and eccentric disc 5 and the right drive shaft 17 and eccentric disc 5 to rotate together via the flat key II 13. The piston rod in the hydraulic cylinder 25 extends. During this process, the roller I7 in the slider 4, pushed by the eccentric disc 5, drives the left outer packaging 10 and the right outer packaging 33 to rise via the connecting pin 9. At the same time, the rocker arm 19 extends continuously with the piston rod in the hydraulic cylinder 25, pushing the left outer packaging 10 and the right outer packaging 33. 3. Rotate around the connecting pins 9 at both ends respectively until the eccentric disk 5 rotates 180 degrees, the piston rod of the oil cylinder 25 is fully extended, and the slider 4 is in the highest position. At this time, the shoulder at the bottom of the slider 4 is in contact with the bottom surface of the sliding seat 3. The inner circular surfaces of the left outer package 10 and the right outer package 33 are on the same cylindrical surface and are concentric with the lower spindle 16. Press the bamboo tube 35 down to the lower spindle 16. At this time, the distance between the inner circular surfaces of the left outer package 10 and the right outer package 33 and the cylindrical surface of the lower spindle (16) is the minimum (e.g., Figure 10 (As shown).

[0039] When unfolded, both the cycloidal pinwheel reducer and the worm gear reducer have a transmission mechanism at their input ends that enables forward and reverse rotation. The cycloidal pinwheel reducer is connected to the lower spindle 16 via a flexible coupling. The driving gear on the lower spindle 16 meshes with the driven gear on the upper spindle 18, causing the upper spindle 18 to rotate. The upper spindle 16 and the lower spindle 18 rotate in opposite directions. After the lower spindle 16 has been rotating for a period of time, the push key 32 on the lower spindle 16 pushes the bamboo tube 35, which is attached to the surface of the lower spindle 16, between the lower spindle 16 and the upper spindle 18 (e.g., ...). Figure 11 , Figure 12 (As shown); Because the distance L between the lower spindle 16 and the upper spindle 18 is less than the thickness of all the unfolded bamboo tubes, the bamboo tubes pushed between the upper spindle 18 and the lower spindle 16 are crushed. The upper spindle 18 and the lower spindle 16 rotate relative to each other, and the upper spindle 18 moves the floating bearing seat up and down with the change in the thickness of the unfolded bamboo tube 35. The crushed bamboo tube 35 will bend upwards; Under the combined action of the pushing force of the push key 32 and the friction generated when the upper spindle 18 and the lower spindle 16 rotate and crush, the upwardly curved bamboo tube 35 is squeezed into the rectangular channel formed by the pressing part 31 and the supporting part 27 of the unfolding plate (as shown); Figure 13 As shown), since the thickness of all the unfolded bamboo tubes 35 is greater than the thickness L of the pad between the pressing member 31 and the support member 27 on the unfolding plate, and the support member 27 is fixed, the pressing member 31 on the unfolding plate can float upward under the pressure. When the unfolded bamboo plate is squeezed into the rectangular channel, the pressing member 31 and the support member 27 on the unfolded bamboo plate generate friction on the upper and lower surfaces of the flattened bamboo plate, giving the unfolded bamboo plate a lateral pressure, effectively preventing the bamboo tubes 35 from cracking when unfolding. When the push key 32 moves to the position of the center line connecting the lower spindle 16 and the upper spindle 18, all the bamboo tubes 35 enter the rectangular channel formed by the pressing member 31 and the support member 27 on the unfolding plate, and the bamboo tubes 35 are fully unfolded into a crack-free bamboo plate 36 (as shown). Figure 14 (As shown); After unfolding, reverse the cycloidal pinwheel reducer to drive the lower spindle 16 and upper spindle 18 to rotate rapidly until the push key 32 on the lower spindle 16 returns to its initial position (as shown). Figure 2 As shown), simultaneously, the rotating worm gear reducer drives the eccentric disc 5 on the left drive shaft 14 and right drive shaft 17 to rotate 180 degrees via chain drive, causing all the piston rods of the four hydraulic cylinders 25 to retract, returning the left outer casing 10 and right outer casing 33 to their positions before the bamboo tube 35 unfolds (as shown). Figure 4 (As shown), insert the next bamboo tube 35, and repeat the above actions.

Claims

1. An improved whole bamboo uncracked development device, comprising: The left support (1), copper sleeve (2), slider seat (3), slider (4), eccentric disc (5), flat key I (6), roller I (7), pin shaft I (8), connecting pin (9), left outer package (10), transmission shaft support (11), driven sprocket (12), flat key II (13), left transmission shaft (14), universal coupling (15), lower mandrel (16), right transmission shaft (17), rocker arm (19), rocker arm support shaft (20), right support (21), pin shaft II (22), frame (23), check ring I (24), oil cylinder (25), check ring II (26), pin shaft III (28), roller II (29), screw (30), right outer package (33), bamboo tube (35), characterized by: the left support (1) and the right support (21) are respectively installed between the left support and the right support in the unfolding device, and two transmission shaft supports (11) are installed in the middle of the frame (23); the two slider seats (3) are respectively fixed in the left support (1) and the right support (21) by four screws (30), and the guide grooves on the installed slider seats (3) are symmetrical with the axis of the lower mandrel (16); a transmission shaft support hole is formed in the left support (1) and the right support (21) below the two slider seats (3), a copper sleeve (2) is arranged in each transmission shaft support hole, the left end of the left transmission shaft (14) is arranged in the copper sleeve (2) of the transmission shaft support hole on the left support (1), and the right end of the left transmission shaft (14) is supported by the transmission shaft support (11); the right end of the right transmission shaft (17) is arranged in the copper sleeve (2) of the transmission shaft support hole on the right support (21), and the left end of the right transmission shaft (17) is supported by the transmission shaft support (11); the left transmission shaft (14) and the right transmission shaft (17) are connected by the universal coupling (15); a blind hole is formed in the end face of the left outer package (10) and the right outer package (33), a connecting pin (9) is arranged in each blind hole, the left outer package (10) and the right outer package (33) are folded, the other end of each connecting pin (9) is inserted into the two holes in the middle of the slider, then the two sliders (4) are arranged in the guide grooves of the slider seats (3); a rocker arm support shaft hole is formed on the two sides of the transmission shaft support hole, one end of the rocker arm support shaft (20) is punched into the rocker arm support shaft hole and clamped by the check ring I (24), the rocker arm (19) is sleeved on the other end of the rocker arm support shaft (20), the other end of the rocker arm (19) is hinged to the head of the piston rod of the oil cylinder (25) by the pin shaft II (22), and the other end of the oil cylinder (25) is hinged to the oil cylinder seat.

2. The improved apparatus for unrolling whole bamboo without cracks according to claim 1, wherein the apparatus is characterized in that: Two connecting pin holes are formed in the middle of the slider (4), the two sides of the bottom of the slider (4) are provided with protrusions, and a rectangular groove is arranged at the middle position of the bottom of the slider (4). The roller I (7) is arranged in the rectangular groove by the pin shaft I (8), and the roller I (7) and the pin shaft I (8) are in clearance fit.

3. The improved apparatus for unrolling whole bamboo without cracks as claimed in claim 1, wherein said apparatus is characterized in that: The fit between the blind hole in the end face of the left outer package (10) and the right outer package (33) and the connecting pin (9) is an interference fit, and the fit between the connecting pin (9) and the hole in the slider (4) is a clearance fit.

4. The improved apparatus for unrolling a whole bamboo without any crack according to claim 1, wherein the apparatus is characterized in that: The opposite surfaces of the left outer package (10) and the right outer package (33) are milled into bevels along the length direction after being folded, and when the left outer package (10) and the right outer package (33) rotate around the respective coupling pins (9), the left outer package (10) and the right outer package (33) are prevented from being interfered with each other when being spread to both sides.

5. The improved apparatus for unrolling a whole bamboo without any crack according to claim 1, wherein the apparatus is characterized in that: The slide block seat (3) is provided with a guide groove in the middle along the vertical direction, and when two slide block seats (3) are installed, the guide grooves must be perpendicular to the horizontal plane, and the slide block (4) can vertically slide up and down in the guide groove of the slide block seat (3).

6. The improved apparatus for unrolling a whole bamboo without any crack according to claim 1, wherein the apparatus is characterized in that: The left transmission shaft (14) is provided with an eccentric disc (5) and a driven sprocket (12), a flat key I (6) is used to fix the left transmission shaft (14) and the eccentric disc (5) in the circumferential direction, and a flat key II (13) is used to fix the left transmission shaft (14) and the driven sprocket (12) in the circumferential direction; the right transmission shaft (17) is only provided with an eccentric disc (5), a flat key I (6) is used to fix the right transmission shaft (17) and the eccentric disc (5) in the circumferential direction; when the universal coupling (15) is used to connect the left transmission shaft (14) and the right transmission shaft (17), the two eccentric discs (5) must be in the same phase.

7. The improved apparatus for unrolling a whole bamboo without any crack according to claim 1, wherein the apparatus is characterized in that: Each rocker arm (19) is provided with an adjusting pad (19-1), each adjusting pad (19-1) is provided with a group of adjusting shims (19-2) with different thicknesses below, and two screws are used to fix the adjusting pad (19-1) and the adjusting shims (19-2) on the rocker arm (19).

8. The improved apparatus for unrolling a whole bamboo without any crack according to claim 1, wherein the apparatus is characterized in that: The outer walls of the two ends of the left outer package (10) and the right outer package (33) are respectively welded with a roller seat, and the roller II (29) is sleeved on the pin shaft III (28) and installed in the roller seat.

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