Improved whole bamboo crack-free unfolding device

Abstract

An improved whole bamboo crack-free unfolding device is characterized in that a rack, an upper mandrel and a lower mandrel in an original device are lengthened, an upper left wrapping piece, a lower left wrapping piece and a right wrapping piece are changed into a left wrapping piece and a right wrapping piece, and three eccentric wheel shafts are removed. The improved whole bamboo crack-free unfolding device is characterized in that a left support and a right support are additionally arranged on the inner side between a left support and a right support, and two transmission shaft supports are additionally arranged in the middle of the rack; the two sliding block seats are installed on the inner side of the left bearing and the inner side of the right bearing, the left bearing and the right bearing under the sliding block seats are respectively provided with a transmission shaft bearing hole, the left transmission shaft and the right transmission shaft are installed in the transmission shaft bearing holes and transmission shaft support holes after being connected through a universal coupling, and the left outer wrapping piece and the right outer wrapping piece are connected with the sliding blocks through connecting pins. The sliding block is arranged in a guide groove of the sliding block seat; after the bamboo tube is loaded, the oil cylinder pushes the left outer wrapping piece and the right outer wrapping piece to rotate around the respective connecting pins, meanwhile, the eccentric discs on the left transmission shaft and the right transmission shaft rotate to push the sliding blocks to move upwards, the left outer wrapping piece and the right outer wrapping piece are folded, the bamboo tube is pressed to the lower mandrel, and the unfolding process is the same as that of an original device.

Description

[0001] Technical Field: The present invention belongs to the technical field of bamboo processing, and mainly relates to an improved device for crack-free expansion of a whole bamboo tube after removing the inner nodes, yellow layer, and green layer, slitting it axially, softening it, and then expanding it into a crack-free bamboo flat plate.

[0002] Background Art: Moso bamboo is an important forest resource with fast growth, high yield, high quality, and easy renewal and restoration. It not only has a short growth cycle but also excellent physical and mechanical properties. However, compared with wood, bamboo has small diameter, thin walls, large taper, and most cross-sections are elliptical, and it has varying degrees of bending along the length direction, which brings many problems and difficulties to its processing and utilization. Therefore, the processing of bamboo is much more difficult than that of wood, and the realization of industrial utilization is not as common as that of wood, which is mainly manifested in the following aspects:

[0003] (1) The utilization rate of bamboo is low. The bamboo green on the outer surface and the bamboo yellow on the inner surface of bamboo cannot be wetted by adhesives, and there are significant differences in material properties from the middle layer of bamboo. The truly utilizable material in bamboo processing is mainly the middle part of bamboo. Currently, for deep processing products such as bamboo floors and rotary cut thin bamboo sheets spliced from bamboo slices, the bamboo utilization rate is below 30%, which causes great waste of bamboo resources and increases the production cost of products at the same time.

[0004] (2) The selection of bamboo processing technology and methods is unreasonable. Currently, bamboo is processed by sawing, splitting, or planing, and can only be processed into bamboo slices with a width of 15 - 20 mm and a thickness of 5 - 7 mm, which are difficult to be directly utilized. To obtain boards and square timbers, the bamboo slices must be glued together. Therefore, the glue consumption of products is very large.

[0005] (3) The accuracy and automation level of equipment are not high. Due to the special structure of bamboo, most products in bamboo processing can only achieve mechanized production, and some processes or products are still difficult to get rid of manual labor. Many current bamboo processing equipment cannot meet the production requirements, and the processing accuracy is not high. Because most of the current equipment used is imitated or improved from woodworking machinery, it is not very suitable for bamboo processing, which not only affects product quality, efficiency, cost, equipment reliability, durability, and automation level, but also has low safety during production, and even endangers personal safety. Therefore, the labor productivity of the bamboo processing industry is low and cannot meet the production needs of modern high-quality bamboo products.

[0006] (4) The structure of bamboo is significantly different from that of wood, and the chemical composition is also not the same. Bamboo contains more nutrients such as hemicellulose, starch, protein, and sugar than wood. Therefore, the insect resistance, decay resistance, and mildew prevention ability of bamboo products are not as good as those of wood products.

[0007] To obtain products with good quality and high added value, expand the application fields of bamboo processed products, improve the utilization rate of bamboo, and enhance its resistance to insects, decay, and mildew, it is necessary to deeply process moso bamboo using unique processing techniques and methods. If the moso bamboo can be unfolded into a crack-free bamboo flat plate, a crack-free bamboo flat plate with a width of 250 - 400 mm, a length of 1300 - 2500 mm, and a thickness of 7 - 10 mm can be obtained. This bamboo flat plate can be directly used as a decorative material, or used to make bamboo floors. It can also be planed into thin bamboo slices of different thicknesses and pasted on various types of board bases to make various decorative materials such as composite floors, furniture panels, and artificial boards. To achieve the crack-free unfolding of the whole bamboo tube and unfold it into a bamboo flat plate, it is necessary to remove the bamboo green on the outer surface of the bamboo tube, the bamboo nodes and bamboo yellow in the inner hole, make longitudinal slits, perform softening treatment, and then unfold it. Currently, a representative invention patent for unfolding the whole bamboo tube into a crack-free bamboo flat plate is "A Device for Unfolding a Whole Bamboo without Cracks (ZL2017105117015)". Its characteristics are that a lower spindle, an upper spindle, three eccentric wheel shafts, and sliding seats for realizing the sliding of the upper left outer package, the lower left outer package, and the right outer package are respectively installed on the left support and the right support at the left and right ends of the frame. The upper left outer package, the lower left outer package, and the right outer package are arranged around the lower spindle, so as to form a large semi-circular ring groove with a variable width between the outer circle of the lower spindle and the inner arcs of the upper left outer package, the lower left outer package, and the right outer package; and the large semi-circular ring groove with a variable width is controlled by six eccentric wheels at both ends of the three eccentric wheel shafts arranged on the outer sides of the upper left outer package, the lower left outer package, and the right outer package; before the bamboo tube is loaded, the three eccentric wheel shafts are driven to rotate by a worm reducer and a chain drive. The eccentric wheels at both ends of each eccentric wheel shaft drive the rollers, the upper left outer package, the lower left outer package, and the right outer package to slide outward along the rectangular grooves on the sliding seats, so that the width of the ring groove between the outer circle of the lower spindle and the inner arcs of the upper left outer package, the lower left outer package, and the right outer package becomes larger, facilitating the insertion of the bamboo tube; after the bamboo tube is loaded into the ring groove, the three eccentric wheel shafts are driven to rotate in reverse by the worm reducer and the chain drive, so that the upper left outer package, the lower left outer package, and the right outer package slide inward along the rectangular grooves on the sliding seats, pressing the bamboo tube against the lower spindle, and making the inner surface of the bamboo tube adhere to the outer surface of the lower spindle.In the original seamless bamboo unfolding device of the invention, due to some design defects in the unfolding device, machining errors of various components, and deformation of welded parts, the following problems exist during 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 respectively installed in the bearing holes on the left support and the right support and perform fixed-axis rotation. The two sliding seats that limit the sliding of the upper left outer package, lower left outer package, and right outer package along the sliding grooves are also installed on the left support and the right support. After the three inner cylindrical surfaces of the upper left outer package, lower left outer package, and right outer package are closed, it is very difficult for them to be located on the same cylindrical surface or the inner cylindrical surface formed after the three inner cylindrical surfaces are closed is not concentric with the lower spindle. As a result, the resistance between the outer surface of the bamboo tube and the contact surfaces of the upper left outer package, lower left outer package, and right outer package during the unfolding process increases, causing the unfolded bamboo flat plate to crack; 2) Since the upper left outer package, lower left outer package, and right outer package are hollow inside (thermal oil needs to be introduced during the operation of the unfolding machine), considering the difficulty of machining the inner cylindrical surfaces of the three outer packages, the three outer packages are generally made of two steel pipes with different diameters after cutting and welding; the central angle corresponding to the inner circle of the upper left outer package is less than 90 degrees, and the central angle corresponding to the inner circle of the lower left outer package is equal to 90 degrees. Therefore, it is extremely easy to generate distortion or warping deformation during welding. Even with welding jigs, it is difficult to guarantee the quality, resulting in a relatively large number of defective products for the upper left outer package and the lower left outer package, causing high manufacturing costs. 3) The upper left outer package, lower left outer package, and right outer package are driven by six eccentric wheels on three eccentric wheel shafts and slide in three different directions. Due to the indexing error during the machining of the three guiding grooves at both ends and the machining errors of parts such as eccentric wheels, it is very difficult to adjust the inner cylindrical surfaces of the upper left outer package, lower left outer package, and right outer package to the same cylindrical surface during installation and debugging; thus, it can be seen that it is very difficult to adjust the original equipment to an ideal state, and the manufacturing cost is relatively high. Coupled with the fact that the three outer packages are filled with high-temperature thermal oil inside, for those outer packages that are distorted or warped after welding and meet the requirements only through shaping, they are prone to deformation after long-term operation, greatly increasing the probability of cracks in the unfolded bamboo flat plate. In view of the above deficiencies in the original invention, improvements are needed to increase the probability that the unfolded bamboo flat plate does not crack to more than 95%.

[0008] Summary of the Invention: The purpose of the present invention is to provide an improved seamless bamboo unfolding device that unfolds a whole bamboo tube with inner nodes, yellow parts, and green parts removed into a seamless bamboo flat plate after axially slitting and softening along the axis.

[0009] The technical improvement solution of the present invention is as follows: The frame, the upper spindle and the lower spindle are appropriately lengthened (while keeping the lengths of the pressing member on the unfolding plate, the unfolding plate support member and the outer package unchanged), the upper left outer package, the lower left outer package and the right outer package are changed to the left outer package and the right outer package (the inner cylindrical surfaces after the upper left, lower left and right outer packages before improvement are closed are the same as the inner cylindrical surfaces after the left outer package and the right outer package after improvement), three eccentric wheel shafts and two eccentric wheels for controlling the sliding of the outer package on each eccentric wheel shaft and two sliding seats for limiting the sliding of the upper left outer package, the lower left outer package and the right outer package along the chute are removed. The improved seamless bamboo unfolding device includes: left support, copper sleeve, slider seat, slider, eccentric disc, flat key I, roller I, pin shaft I, connection pin, left outer package, transmission shaft support, driven sprocket, flat key II, left transmission shaft, universal coupling, lower spindle, right transmission shaft, rocker arm, rocker arm support shaft, right support, pin shaft II, frame, retaining ring I, oil cylinder, retaining ring II, pin shaft III, roller II, screw, right outer package, bamboo tube, and is characterized in that: Left support and right support are respectively additionally installed inside between the left support and the right support in the unfolding device, two transmission shaft supports are installed in the middle of the frame, two slider seats are respectively fixed on the inner sides of the left support and the right support with four screws, and the guide grooves on the installed slider seats are symmetrical with the axis of the lower spindle; A transmission shaft support hole is opened on each of the left support and the right support directly below the installation of the two slider seats, a copper sleeve is arranged in each transmission shaft support hole, the left end of the left transmission shaft is placed in the copper sleeve of the transmission shaft support hole on the left support, and its right end is supported by the transmission shaft support, the right end of the right transmission shaft is placed in the copper sleeve of the transmission shaft support hole on the right support, and its left end is supported by the transmission shaft support, and the left transmission shaft and the right transmission shaft are connected by a universal coupling; A blind hole is processed on each of the end faces at both ends of the left outer package and the right outer package, a connection pin is installed in each blind hole, the left outer package and the right outer package are closed, and the other ends of the two connection pins at each end are inserted into two holes in the middle of the slider, and then the two sliders are placed in the guide grooves of the slider seats; A rocker arm support shaft hole is processed on each side of the transmission shaft support hole on the left support and the right support, one end of the rocker arm support shaft is driven into the rocker arm support shaft hole and is clamped with a retaining ring I, the rocker arm is sleeved on the other end of the rocker arm support shaft, the other end of the rocker arm is hinged with the head of the piston rod of the oil cylinder by a pin shaft II, and the other end of the oil cylinder is hinged on the oil cylinder seat.

[0010] The fit between the blind holes on the end faces at both ends of the left outer package and the right outer package and the connection pins is an interference fit, and the fit between the connection pins and the holes on the slider is a clearance fit; When the sliders at both ends slide up and down along the guide grooves of the slider seats, the left outer package and the right outer package will move up and down together with the sliders at both ends, and at the same time, the left outer package and the right outer package can rotate counterclockwise or clockwise around the connection pins under their respective gravity or the push of the rocker arm.

[0011] Two connection pin holes are opened in the middle of the slider (such as Figure 5As shown in the figure, a rectangular groove is provided at the middle position of the bottom of the slider (as Figure 6 shown). The roller I is installed in the rectangular groove through the pin shaft I. There is a clearance fit between the roller I and the pin shaft I. In addition, shoulders are provided on both sides of the bottom of the slider (as Figure 5 shown). When the slider is pushed to the highest position by the eccentric disc, the shoulders at the bottom of the slider just contact the bottom surface of the sliding seat. If the shoulders are not provided on both sides of the bottom of the slider, during the unfolding process of the bamboo tube, when the push key on the center shaft rotates to the area where the right outer package is located (as Figure 13 shown), especially when the push key rotates to the upper half area of the right outer package, the force exerted by the push key on the bamboo tube is upward, which will drive the right outer package, the connecting pin, the slider and the left outer package to move upward together, causing the distance between the inner surfaces of the left outer package and the right outer package and the surface of the center shaft to change, that is, the distance below the center shaft becomes smaller, and the distances on the left and right sides above the center shaft become larger, so that the bamboo tube bulges upward before entering between the upper center shaft and the lower center shaft, resulting in the bamboo tube cracking before entering between the upper center shaft and the lower center shaft. Therefore, by providing shoulders on both sides of the bottom of the slider, the upward force exerted by the push key on the bamboo tube can be overcome, and the highest position of the slider can be kept unchanged. When unfolding the bamboo tube, no matter what position the push key runs to in the area of the right outer package, the upward component force exerted by the push key on the bamboo tube will not cause the slider to move, thus ensuring that when the bamboo tube is unfolded, the distance between the inner surfaces of the left outer package and the right outer package after being closed and the outer surface of the center shaft remains unchanged, providing equipment guarantee for unfolding the bamboo tube into a crack-free bamboo flat plate.

[0012] The two opposite surfaces of the closed left outer package and right outer package are milled into inclined surfaces along the length direction (as Figure 9 shown). When the left outer package and the right outer package rotate around their respective connecting pins respectively, interference between the left outer package and the right outer package when they open to both sides is avoided.

[0013] An eccentric disc and a driven sprocket are installed on the left transmission shaft. A circumferential fixation between the left transmission shaft and the eccentric disc is achieved by a flat key I, and a circumferential fixation between the left transmission shaft and the driven sprocket is achieved by a flat key II. Only an eccentric disc is installed on the right transmission shaft, and a circumferential fixation between the right transmission shaft and the eccentric disc is achieved by a flat key I. When connecting the left transmission shaft (14) and the right transmission shaft (17) with a universal coupling (15), it is necessary to ensure that the two eccentric discs (5) on the left and right are in the same phase. The installation positions of the two eccentric discs on the left and right transmission shafts are respectively directly below the two end sliders. After installation, the maximum radial diameter of the eccentric disc contacts the roller installed at the bottom of the slider, and 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 debugging, the piston rods of the four oil cylinders are in the fully extended state. Under the action of the self-weight of the left outer package, the right outer package and the connecting pins, the two sliders will slide downward along the guiding groove of the sliding seat together. 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 transmission shafts. At this time, the left outer package and the right outer package are closed, and the distance between the inner cylindrical surface where they are located and the outer circular surface of the lower spindle is equal everywhere (that is, the axis line of the inner circular surface is coaxial with the lower spindle), and it is the smallest. Before the bamboo tube is unfolded, the four oil cylinders arranged on both sides of the left outer package and the right outer package act together, and the piston rods retract. At the same time, the chain drive works, and the driven sprocket drives the left transmission shaft, the eccentric disc, the right transmission shaft and the eccentric disc to rotate through the flat key II. During this process, the left outer package and the right outer package move downward with the slider under the action of gravity, and at the same time rotate outward around their respective connecting pins at both ends. When the two eccentric discs rotate 180 degrees and the piston rods of the four oil cylinders are fully retracted, the minimum radial diameter of the eccentric disc contacts the roller I. When the slider is in the lowest position, the distance between the inner circular surfaces on the left outer package and the right outer package and the outer cylindrical surface of the lower spindle increases to the maximum (as Figure 4 shown), so as to facilitate the insertion of the bamboo tube; when the bamboo tube is loaded into the unfolding machine, the chain drive works, and the driven sprocket drives the left transmission shaft, the eccentric disc, the right transmission shaft and the eccentric disc to rotate together through the flat key II, and the piston rods in the oil cylinders extend. 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 continuously pushes the left outer package and the right outer package to rotate around their respective connecting pins at both ends as the piston rod in the oil cylinder extends. Until the two eccentric discs rotate 180 degrees and the piston rods of the oil cylinders are all extended, the slider is in the highest position. At this time, the shoulders at the bottom of the slider just contact the bottom surface of the sliding seat. The inner circular surfaces on the left outer package and the right outer package are located on the same cylindrical surface and are concentric with the lower spindle, pressing the bamboo tube against the lower spindle. 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 spindle is the smallest (as Figure 2 , Figure 3 shown).

[0014] A guiding groove is vertically formed in the middle of the sliding seat (as Figure 8 shown). The slider is placed in the guiding groove of the sliding seat and can slide vertically in the guiding groove of the sliding seat. When installing the two slider seats, it must be ensured that the guiding groove is perpendicular to the horizontal plane, and the slider can slide vertically up and down freely in the guiding groove of the sliding seat.

[0015] The left outer package and the right outer package are made by cutting steel pipes with different diameters and then welding on the panels and partitions, and a cavity is formed inside. There are oil through holes on the partitions. The central angle corresponding to the end face arc of the improved left outer package is greater than 120 degrees, and the central angle corresponding to the end face arc of the right outer package is greater than 160 degrees. Therefore, whether cutting the arc parts from the round pipes or welding and forming, the distortion and warping deformation of the left outer package and the right outer package are very small. If welding jigs are used during welding, the inner circular surfaces of the left outer package and the right outer package can meet the use requirements without machining or with simple shaping after welding, and no further machining is required.

[0016] A adjusting pad is arranged on each rocker arm, and there is a set of adjusting shims with different thicknesses under each adjusting pad. The adjusting pad and the adjusting shims are fixed on the rocker arm with two screws. The functions of setting the adjusting pad and the adjusting shims are as follows: when the piston rods of the four oil cylinders are in the fully extended state, the maximum radial diameters on the two eccentric discs contact the rollers, the slider is in the highest position, and the distances between the inner circular surfaces where the left outer package and the right outer package are located and the outer circular surface of the lower spindle are not equal, the adjusting shims are increased or decreased until the distances between the inner circular surfaces where the left outer package and the right outer package are located and the outer circular surface of the lower spindle are equal everywhere.

[0017] Roller seats are respectively welded on the outer walls at both ends of the left outer package and the right outer package, and a pin III is installed on each roller seat. Each pin III is sleeved with a roller II. When the oil cylinder pushes the rocker arm to rotate, the left outer package and the right outer package respectively rotate around their respective connection pins through the roller II, the pin III, and the roller seat.

[0018] The bamboo tube is a bamboo tube that has been de-noded, de-bambooed, longitudinally slit, and softened.

[0019] Cavities are provided in the middle of the left outer package, the right outer package, the upper spindle, and the pressing part of the unfolding plate, and the cavities are filled with heat-conducting oil.

[0020] The advantages and positive effects of the present invention are as follows: 1. By respectively installing a left support and a right support on the inner sides between the left support and the right support, the lower spindle, the upper spindle, the pressing member on the unfolding plate, the supporting member of the unfolding plate, the left outer package, the right outer package and the transmission shaft are separately supported, greatly facilitating the assembly and debugging of the unfolding machine, especially making the concentricity problem between the lower spindle and the left outer package and the right outer package simple; 2. Changing the original three long eccentric shaft wheels to two concentric short transmission shafts not only simplifies the structure, but also simplifies the transmission device for driving the shaft to rotate, and also solves the problem that it is difficult for the three eccentric shaft wheels to be synchronized; 3. Changing the upper left outer package, the lower left outer package and the right outer package to the left outer package and the right outer package, so that the central angles corresponding to the end face arcs of the left outer package and the right outer package are both greater than 90 degrees, so that the distortion and warping deformation generated during cutting and welding on the steel pipe are very small, greatly reducing the generation of waste products in production and processing; 4. By respectively inserting one end of the four connecting pins into the blind holes on the end faces of the left outer package and the right outer package, and the other end into the sliders at both ends, the inner cylindrical surfaces of the left outer package and the right outer package can be aligned, and adjustment gaskets are provided on the rocker arm. By simply increasing or decreasing the adjustment gaskets, it is easy to make the inner circular surfaces of the closed left outer package and the right outer package on the same cylindrical surface and concentric with the lower spindle. Brief Description of the Drawings

[0021] Figure 1 The F-F sectional view mainly shows the mutual positional relationship between important components such as the upper and lower spindles, the outer packages, and the transmission shaft in the unfolding device within the axial section.

[0022] Figure 2 The A-A sectional view mainly shows the mutual positional relationship between the main parts at the left end of the main body of the unfolding device when the piston rod of the oil cylinder is fully extended.

[0023] Figure 3 The B-B sectional view mainly shows the mutual positional relationship between the main parts at the right end of the main body of the unfolding device when the piston rod of the oil cylinder is fully extended.

[0024] Figure 4 The A-A sectional view mainly shows the situation after the left outer package opens to the left, the right outer package opens to the right and moves downward with the slider together, and the distance between the left and right outer packages and the lower spindle becomes larger after the piston rod of the oil cylinder is fully retracted and the transmission shaft drives the eccentric disk to rotate 180 degrees.

[0025] Figure 5 Shows the outer shape of the slider.

[0026] Figure 6 The D-D sectional view mainly expresses the internal structure of the slider.

[0027] Figure 7 Shows the outer shape of the slider seat.

[0028] Figure 8 The E-E sectional view shows the internal structure of the slider seat.

[0029] Figure 9 Schematic diagram showing that the vertical surfaces of the left outer package and the right outer package facing each other are milled into inclined surfaces along the length direction.

[0030] Figure 10 The C-C sectional view shows a schematic diagram of the left outer package and the right outer package pressing the bamboo tube onto the lower mandrel after the bamboo tube is loaded into the unfolding machine.

[0031] Figure 11 The C-C sectional view shows the situation at the instant when the push key just touches the bamboo tube after the upper and lower mandrels start to rotate.

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

[0033] Figure 13 The C-C sectional view shows a schematic diagram of the push key moving into the area of the right outer package and a part of the bamboo tube being unfolded.

[0034] Figure 14 The C-C sectional view shows a schematic diagram of the push key moving directly below the upper mandrel and the bamboo tube being completely unfolded into a crack-free bamboo flat plate.

[0035] In the figure: 1. Left support; 2. Copper bushing; 3. Slider seat; 4. Slider; 5. Eccentric disc; 6. Flat key I; 7. Roller I; 8. Pin shaft I; 9. Connecting pin; 10. Left outer package; 11. Transmission shaft support; 12. Driven sprocket; 13. Flat key II; 14. Left transmission shaft; 15. Universal coupling; 16. Lower mandrel; 17. Right transmission shaft; 18. Upper mandrel; 19. Rocker arm; 20. Rocker arm support shaft; 21. Right support; 22. Pin shaft II; 23. Frame; 24. Retaining ring I; 25. Oil cylinder; 26. Retaining ring II; 27. Unfolding plate support; 28. Pin shaft III; 29. Roller II; 30. Screw; 31. Upper pressing part of the unfolding plate; 32. Push key; 33. Right outer package; 34. Heat transfer oil; 35. Bamboo tube; 36. Crack-free bamboo flat plate made from a whole bamboo Specific implementation method

[0036] The improved seamless-expanded whole bamboo device, while keeping the lengths of the pressing member on the bamboo flat plate, the supporting member under the bamboo flat plate, the upper left, lower left and right outer wrapping members in the original device unchanged, appropriately extends the frame 23, the upper spindle 19 and the lower spindle 16, and changes the upper left outer wrapping member, the lower left outer wrapping member and the right outer wrapping member into a left outer wrapping member 10 and a right outer wrapping member 33 (the wrapped range of the outer wrapping members after closing is basically unchanged), removes three eccentric cam shafts and two eccentric cams on each eccentric cam shaft for controlling the sliding of the outer wrapping members; respectively installs a left support 1 and a right support 21 on the inner sides between the left support and the right support in the expansion device, installs the expansion plate supporting member 27 on the left support 1 and the right support 21, and installs the pressing member 31 on the expansion plate on the expansion plate supporting member 27; installs two transmission shaft supports 11 in the middle of the frame 23, fixes two slider seats 3 on the inner sides of the left support 1 and the right support 21 respectively with four screws 30, and the guide grooves on the installed slider seats 3 are symmetrical with the axis of the lower spindle 16; respectively open a transmission shaft support hole on the left support 1 and the right support 21 directly below the installation of the two slider seats 3, and arrange a copper sleeve 2 in each transmission shaft support hole, place the left end of the left transmission shaft 14 in the copper sleeve 2 of the transmission shaft support hole on the left support 1, and its right end is supported by the transmission shaft support 11; place the right end of the right transmission shaft 17 in the copper sleeve 2 of the transmission shaft support hole on the right support 21, and its left end is supported by the transmission shaft support 11; the left transmission shaft 14 and the right transmission shaft 17 are connected by a universal coupling 15 (as Figure 1 shown); respectively machine a blind hole on the end faces at both ends of the left outer wrapping member (10) and the right outer wrapping member (33), install a connecting pin (9) in each blind hole, close the left outer wrapping member (10) and the right outer wrapping member (33), and insert the other ends of the two connecting pins (9) at each end into two holes in the middle of the slider 4, and then place the two sliders (4) in the guide grooves of the slider seats (3); respectively machine a rocker arm support shaft hole on both sides of the transmission shaft support hole, drive one end of the rocker arm support shaft 20 into the rocker arm support shaft hole, and block it with a snap ring I24, sleeve the rocker arm 19 on the other end of the rocker arm support shaft 20, and hinge the other end of the rocker arm 19 with the head of the piston rod of the oil cylinder 25, and hinge the other end of the oil cylinder 25 on the oil cylinder seat (as Figure 2 , Figure 3 shown).

[0037] After installation and debugging, the piston rods of the four oil cylinders 25 are in the fully extended state, the maximum radial diameter on the eccentric disc 5 contacts the roller I7, the shoulders on both sides of the bottom of the slider 4 just contact the bottom surface of the slider seat 3, the slider 4 is in the highest position, the distance between the inner circular surface where the left outer wrapping member 10 and the right outer wrapping member 33 are located and the outer surface of the lower spindle 16 is equal everywhere and is the smallest, and the push key 32 on the lower spindle 16 is located below the expansion plate supporting member 27 (as Figure 2As shown in the figure; the distance between the upper mandrel 18 and the lower mandrel 16 and the distance between the pressing member 31 on the unfolding plate and the supporting member 27 of the unfolding plate are both L, and the value of L is less than the thickness of all the bamboo tubes to be unfolded; the two floating bearing seats supporting the upper mandrel 18 are pressed by disc springs, and the rotation screw II adjusts the magnitude of the disc spring pressure through the pressing plate II; compression springs are provided at both ends of the upper surface of the pressing member 31 on the unfolding plate, and the rotation screw I can adjust the magnitude of the compression spring pressure through the pressing plate I.

[0038] Before the bamboo tube 35 is unfolded, the four oil cylinders 25 arranged on both sides of the left outer package 10 and the right outer package 33 act together, and the piston rods retract. At the same time, the chain drive works, and the driven sprocket 12 drives the left transmission shaft 14 and the eccentric disc 5 and the right transmission shaft 17 and the eccentric disc 5 to rotate through the flat key II13. During this process, the left outer package 10 and the right outer package 33 move downward along with the slider 4 under the action of gravity, and at the same time rotate around the respective connecting pins 9 at both ends and open outward respectively. When the two eccentric discs 5 rotate 180 degrees and the piston rods of the four oil cylinders 25 are fully retracted, the minimum radial diameter on the eccentric disc 5 contacts the roller I7. At this time, the slider 4 is in the lowest position, and the distance between the inner circular surfaces of the left outer package 10 and the right outer package 33 and the outer cylindrical surface of the lower mandrel 16 increases to the maximum, so as to facilitate the insertion of the bamboo tube 35 (as Figure 4 shown); after the upper mandrel 18, the lower mandrel 16 and the push key 32 return to the Figure 10 position shown in the figure, the bamboo tube 35 is loaded into the unfolding machine, the chain drive works, and the driven sprocket 12 drives the left transmission shaft 14 and the eccentric disc 5 and the right transmission shaft 17 and the eccentric disc 5 to rotate together through the flat key II13, and the piston rods in the oil cylinders 25 extend. During this process, the roller I7 in the slider 4 drives the left outer package 10 and the right outer package 33 to rise through the connecting pin 9 under the push of the eccentric disc 5, and at the same time the rocker arm 19 continuously pushes the left outer package 10 and the right outer package 33 to rotate around the respective connecting pins 9 at both ends as the piston rods in the oil cylinders 25 extend until the eccentric disc 5 rotates 180 degrees and the piston rods of the oil cylinders 25 are fully extended, and the slider 4 is in the highest position. At this time, the shoulder at the bottom of the slider 4 just contacts the bottom surface of the sliding seat 3, and the inner circular surfaces of the left outer package 10 and the right outer package 33 are located on the same cylindrical surface and are concentric with the lower mandrel 16, pressing the bamboo tube 35 against the lower mandrel 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 mandrel (16) is the smallest (as Figure 10 shown).

[0039] When unfolded, a transmission mechanism capable of realizing forward and reverse rotation is provided at the input ends of the cycloid pinwheel reducer and the worm reducer. Among them, the cycloid pinwheel reducer is connected to the lower spindle 16 through an elastic coupling. The driving gear on the lower spindle 16 meshes with the driven gear on the upper spindle 18 to drive the upper spindle 18 to rotate. The rotation directions of the lower spindle 16 and the upper spindle 18 are opposite. After the lower spindle 16 starts to rotate for a period of time, the push key 32 on the lower spindle 16 pushes the bamboo tube 35 attached to the surface of the lower spindle 16 between the lower spindle 16 and the upper spindle 18 (as shown in Figure 11 , Figure 12 ). Since the distance L between the lower spindle 16 and the upper spindle 18 is smaller 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. While the lower spindle 16 and the upper spindle 18 rotate relative to each other, the upper spindle 18 drives the floating bearing seat to float up and down as the thickness of the unfolded bamboo tube 35 changes. The crushed bamboo tube 35 will warp upwards. Under the combined action of the thrust of the push key 32 and the frictional force generated during the rotation and rolling of the upper spindle 18 and the lower spindle 16, the warped bamboo tube 35 is squeezed into the rectangular channel formed by the pressing member 31 on the unfolding plate and the supporting member 27 of the unfolding plate (as shown in Figure 13 ). Since the thickness of all the unfolded bamboo tubes 35 is greater than the thickness L of the spacer between the pressing member 31 on the unfolding plate and the supporting member 27 of the unfolding plate, and the supporting member 27 of the unfolding plate is fixed, the pressing member 31 on the unfolding plate can float upwards under the action of the extrusion force. When the unfolded bamboo flat plate is squeezed into the rectangular channel, the pressing member 31 on the unfolding plate and the supporting member 27 of the unfolding plate generate frictional forces on the upper and lower surfaces of the flattened bamboo flat plate, giving the unfolded bamboo flat plate a lateral pressure, effectively preventing the bamboo tube 35 from cracking when unfolded. When the push key 32 runs to the position of the center connection line between the lower spindle 16 and the upper spindle 18, all the bamboo tubes 35 enter between the rectangular channels formed by the pressing member 31 on the unfolding plate and the supporting member 27 of the unfolding plate, and the bamboo tubes 35 are completely unfolded into a crack-free bamboo flat plate 36 (as shown in Figure 14 ). After the unfolding is completed, reverse the cycloid pinwheel reducer to drive the lower spindle 16 and the upper spindle 18 to rotate rapidly until the push key 32 on the lower spindle 16 returns to the initial position (as shown in Figure 2 ). At the same time, rotate the worm reducer to drive the eccentric discs 5 on the left transmission shaft 14 and the right transmission shaft 17 to rotate 180 degrees through chain drive, and the piston rods of all four oil cylinders 25 retract, so that the left outer package 10 and the right outer package 33 return to the positions before the bamboo tube 35 is unfolded (as shown in Figure 4 ), load the next bamboo tube 35, and repeat the above actions.

Claims

1. An improved whole bamboo crack-free unfolding device, comprising: Left bearing (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 spindle (16), right transmission shaft (17), rocker arm (19), rocker arm support shaft (20), right bearing (21), pin shaft II (22), frame (23), retaining ring I (24), oil cylinder (25), retaining ring II (26), pin shaft II I (28), roller II (29), screw (30), right outer package (33), bamboo tube (35), characterized in that: a left support (1) and a right support (21) are respectively installed inside 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); two slider seats (3) are respectively fixed to the inner sides of the left support (1) and the right support (21) by four screws (30), and the guide grooves on the slider seats (3) after installation are symmetrical with the axis of the lower spindle (16); a left support (1) and a right support (21) are respectively opened below the two slider seats (3) A transmission shaft support hole is formed on each transmission shaft support hole, and a copper sleeve (2) is arranged in each transmission shaft support hole. The left end of the left transmission shaft (14) is placed in the copper sleeve (2) of the transmission shaft support hole on the left support (1), and its right end is supported by the transmission shaft support (11). The right end of the right transmission shaft is placed in the copper sleeve (2) of the transmission shaft support hole on the right support (21), and its left end is supported by the transmission shaft support (11). The left transmission shaft (14) and the right transmission shaft (17) are connected by a universal joint (15). A blind hole is processed on the end faces 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 assembled, 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, and then the two sliders (4) are placed in the guide grooves of the slider seat (3); a rocker arm support shaft hole is processed 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 clamped with a retaining ring I (24), the rocker arm (19) is inserted 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) by a pin II (22), and the other end of the oil cylinder (25) is hinged to the oil cylinder seat.

2. An improved whole bamboo crack-free unfolding device, characterized in that: Two connecting pin holes are processed in the middle of the slider (4), and shoulders are arranged on both sides of the bottom of the slider (4). A rectangular groove is arranged in the middle of the bottom of the slider (4), and the roller I (7) is installed in the rectangular groove through the pin shaft I (8), and there is a clearance fit between the roller I (7) and the pin shaft I (8).

3. An improved whole bamboo crack-free unfolding device, characterized in that: The blind holes on the end surfaces of the left outer package (10) and the right outer package (33) are interference fit with the connecting pin (9), and the connecting pin (9) and the hole on the slider (4) are clearance fit.

4. An improved whole bamboo crack-free unfolding device, characterized in that: After the left outer component (10) and the right outer component (33) are closed, two opposing surfaces are milled into inclined surfaces along the length direction, so that when the left outer component (10) and the right outer component (33) rotate around their respective connecting pins (9), interference between the left outer component (10) and the right outer component (33) when they are opened to both sides is avoided.

5. An improved whole bamboo crack-free unfolding device, characterized by: The middle of the sliding seat (3) is provided with a guide groove in the vertical direction. When installing the two sliding seat seats (3), the guide groove must be perpendicular to the horizontal plane. The sliding block (4) can slide vertically up and down freely in the guide groove of the sliding seat (3).

6. An improved whole bamboo crack-free unfolding device, characterized by: The left transmission shaft (14) is provided with an eccentric disk (5) and a driven sprocket (12), and a flat key I (6) is used to realize circumferential fixation between the left transmission shaft (14) and the eccentric disk (5), and a flat key II (13) is used to realize circumferential fixation between the left transmission shaft (14) and the driven sprocket (12); the right transmission shaft (17) is only provided with an eccentric disk (5), and a flat key I (6) is used to realize circumferential fixation between the right transmission shaft (17) and the eccentric disk (5); when the left transmission shaft (14) and the right transmission shaft (17) are connected by a universal coupling (15), it must be ensured that the two eccentric disks (5) on the left and right are in the same phase.

7. An improved whole bamboo crack-free unfolding device, characterized by: Each rocker arm (19) is provided with an adjustment pad (19-1), and a group of adjustment pads (19-2) with different thicknesses are provided below each adjustment pad (19-1). The adjustment pad (19-1) and the adjustment pad (19-2) are fixed to the rocker arm (19) by two screws.

8. An improved whole bamboo crack-free unfolding device, characterized by: A roller seat is welded on the outer wall of both ends of the left outer package (10) and the right outer package (33), and the roller II (29) is sleeved on the pin III (28) and installed in the roller seat.

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