A processing device for plastic bending and forming of round bamboo

Abstract

The present invention relates to a processing device for plastic bending and forming of round bamboo, which includes a fixed inner mold, a base and a rotating forming mechanism. The fixed inner mold is arranged in the middle of the base. The upper surface of the fixed inner mold is semi-circular. A first slide rail and a second slide rail are respectively arranged on both sides of the fixed inner mold. A first fixed outer mold is slidably connected to the first slide rail, and a second fixed outer mold is slidably connected to the second slide rail, which are used to fix the positions of both ends of the bent bamboo. One end of the rotating rod in the rotating forming mechanism takes the center of the fixed inner mold as the pivot to drive the rotating rod to rotate. A clamping wheel is arranged on the rotating rod. The clamping wheel always contacts the outer surface of the bamboo, and during the rotation of the rotating rod, the clamping wheel presses the bamboo against the surface of the fixed inner mold to carry out plastic bending and forming.

Description

Technical Field

[0001] The present invention belongs to the technical field of bamboo processing, and particularly relates to a processing device for plastic bending forming of round bamboo. Background Art

[0002] Bamboo has the advantages of short growth cycle, large yield, strong ecological function, wide application, high economic value, etc. At present, it is widely used in the fields of production construction and life, such as bamboo architecture, bamboo furniture products, bamboo farm tools, transportation, packaging, textile, papermaking, food and many other fields. In the fields of furniture or packaging, etc., it is often necessary to present some curved shapes. For example, the backrest of a round chair, a storage basket, or a computer stand, etc. often use bamboo bent materials. Therefore, plastic bending forming of bamboo is an important application direction in the processing field. However, it is very difficult to bend the gradient structure of bamboo with hollow and joints by conventional equipment, and it is extremely easy to crack. So far, the commonly used bending forming method in enterprises is still fire roasting, with low industrialization degree, high requirements for the technical level of workers, and naturally high labor costs. When bending bamboo, stress is easy to concentrate, and the phenomenon of bamboo cracking is easy to occur, resulting in unstable product quality, high defective rate, and waste of bamboo. Summary of the Invention

[0003] In view of the above problems, the present invention provides a processing device for plastic bending forming of round bamboo, including a fixed inner mold, a base, and a rotating forming mechanism. The fixed inner mold is arranged in the middle of the base. The upper surface of the fixed inner mold is semi-circular. A first slide rail and a second slide rail are respectively arranged on both sides of the fixed inner mold. A first fixed outer mold is slidably connected to the first slide rail, and a second fixed outer mold is slidably connected to the second slide rail, which is used to fix the positions of both ends of the bent bamboo.

[0004] One end of the rotating rod in the rotating forming mechanism takes the center of the fixed inner mold as the fulcrum to drive the rotating rod to rotate. A clamping wheel is arranged on the rotating rod. The clamping wheel always contacts the outer surface of the bamboo, and during the rotation of the rotating rod, the clamping wheel presses the bamboo tightly against the surface of the fixed inner mold to perform plastic bending forming.

[0005] The shape of the outer surface of the fixed inner mold of the present invention is the shape formed after plastic bending of round bamboo, which is semi-circular. This is the most common and most demanded shape in round bamboo processing. The rotating rod rotates with the center of the fixed inner mold as the fulcrum, and the moving track of the clamping wheel along with the rotating rod is also semi-circular and moves along the outer surface of the fixed inner mold. The present invention utilizes this point to clamp the round bamboo between the outer surface of the fixed inner mold and the clamping wheel. The first fixed outer mold fixes the fixed end of the bamboo. As the rotating rod rotates, the clamping wheel rolls the bamboo on the outer surface of the fixed inner mold. When the rotating rod rotates 180°, the other end (the movable bending end) of the bamboo is closely attached to the other side of the fixed inner mold and is fixed by the second fixed outer mold, that is, the plastic bending forming of the bamboo is completed.

[0006] Optionally, the first slide rail and the second slide rail are horizontally arranged on the left and right sides of the fixed inner mold. The fixed inner mold has a certain width in the front-rear direction for carrying bamboo materials.

[0007] The width of the first slide rail in the front-rear direction is not less than the width of the fixed inner mold, and the center line of the first slide rail along the length direction of the first slide rail coincides with the center line of the fixed inner mold, so that the first fixed outer mold can be directly opposite to the bamboo materials on the fixed inner mold. A through hole is provided at the position where the first slide rail is butted against the fixed inner mold for the fixed end of the bamboo material to be vertically inserted into the through hole.

[0008] One side of the base where the second slide rail is provided protrudes backward from the fixed inner mold, so that the front surface of this side of the base is flush with the rear surface of the fixed inner mold, without affecting the movable bending end of the bamboo material from moving and bending towards the fixed inner mold.

[0009] Optionally, a first positioning structure is provided on the outer side of the first slide rail for moving and positioning the position of the first fixed outer mold. The first positioning structure includes a first support frame and a first threaded rod. The first support frame includes a first main board and first sub-rods on both sides thereof. The bottom of the first main board is fixedly connected to one end of the first slide rail away from the fixed inner mold. The two sides of the first main board are respectively connected to the first sub-rods, and the other ends of the two first sub-rods are respectively fixedly connected to the front end face and the rear end face of the fixed inner mold for stabilizing the first main board. The first sub-rods are parallel to the first slide rail.

[0010] The outer surface of the first threaded rod is provided with an external thread. One end thereof is used to contact and push the first fixed outer mold, and the other end penetrates through the first main board and a turning handle is provided. The turning handle is arranged on the outer side of the first main board.

[0011] On the inner side surface of the first main board that encloses the first threaded rod inside, an internal thread is provided for cooperating with the rotation of the first threaded rod and fixing the position of the first threaded rod.

[0012] Optionally, a second positioning structure is provided on the outer side of the second slide rail for moving and positioning the position of the second fixed outer mold. The second positioning structure includes a second support frame and a second threaded rod. The second support frame includes a second main board, a third main board and second sub-rods on both sides of the second main board and the third main board. The bottom of the second main board and the bottom of the third main board are respectively fixedly connected to one end of the second slide rail away from the fixed inner mold and one end close to the fixed inner mold. The two sides of the second main board and the third main board are respectively connected to the second sub-rods for stabilizing the second main board and the third main board. The second sub-rods are parallel to the second slide rail.

[0013] The outer surface of the second threaded rod is provided with an external thread. One end thereof is used to contact and push the second fixed outer mold, and the other end penetrates through the second main board and a turning handle is provided. The turning handle is arranged on the outer side of the second main board.

[0014] On the inner side of the second main board and surrounding the second threaded rod, there is an internal thread for cooperating with the rotation of the second threaded rod and fixing the position of the second threaded rod.

[0015] Further optionally, on the side of the second fixed outer mold pointing to the front of the base, there is a pressing plate. The pressing plate is provided with a through hole for the second auxiliary rod near the front of the base to pass through the pressing plate. The pressing plate can move together with the second fixed outer mold and fix the movable free end of the bamboo.

[0016] Optionally, the rotation forming mechanism is arranged on the rear side of the fixed inner mold and includes a middle rotating rod, a clamping wheel and a rotating shaft. One end of the middle rotating rod is connected to the rotating shaft. The rotating shaft is fixed at the center of the rear side of the fixed inner mold and is connected to a driving motor for driving the rotating shaft and the middle rotating rod to rotate. The driving motor is arranged on the front side or the rear side of the fixed inner mold;

[0017] The axle of the clamping wheel is horizontally arranged and connected to the front side of the middle rotating rod, so that the clamping wheel can rotate in the vertical direction; the width of the clamping wheel is not less than the width of the fixed inner mold. A clamping piece parallel to the middle rotating rod is provided at the end of the axle of the clamping wheel away from the middle rotating rod, and the position of the clamping piece is fixed;

[0018] The bottom end of the clamping piece catches the front side of the fixed inner mold, so that the clamping wheel rolls stably along the upper surface of the fixed inner mold.

[0019] Optionally, the processing equipment for circular bamboo plastic bending and forming further includes a forming auxiliary mechanism to enhance the plasticity of the bamboo. The forming auxiliary mechanism includes a front rotating rod, a rear rotating rod and a fixed rod. The front rotating rod is on the side of the middle rotating rod close to the second slide rail, and the rear rotating rod is on the side of the middle rotating rod close to the first slide rail, and their relative positions with the middle rotating rod are fixed, that is, the front rotating rod and the rear rotating rod rotate at the same speed as the middle rotating rod;

[0020] A pre-pressing wheel is provided on the front rotating rod for pre-contacting and pre-pressing the bamboo;

[0021] The fixed rod is fixed at the starting position of the rotation of the rear rotating rod. A foldable and retractable shed is sleeved between the rear rotating rod and the fixed rod for curing the bent bamboo fixed on the fixed inner mold by the clamping wheel.

[0022] Further optionally, the bottom end of the front rotating rod is fixedly connected to the rotating shaft, so that the rotating shaft can drive the front rotating rod to rotate together;

[0023] The height of the pre-pressing wheel is higher than that of the clamping wheel. The axle of the pre-pressing wheel is horizontally arranged and connected to the front side of the front rotating rod, enabling the pre-pressing wheel to rotate in the vertical direction. The width of the pre-pressing wheel can cover the width of the bamboo. A protective piece parallel to the front rotating rod is provided at one end of the axle of the pre-pressing wheel away from the front rotating rod. The position of the protective piece is fixed and is used to gather the bamboo between the front rotating rod and the protective piece, so that the bamboo can be rolled by the pre-pressing wheel.

[0024] Further optionally, the rear rotating rod and the fixed rod are located on the front side of the fixed inner mold. The rotating shaft penetrates through the fixed inner mold and protrudes from the front side of the fixed inner mold. The bottom end of the rear rotating rod is fixedly connected to the rotating shaft, and the bottom end of the fixed rod is rotatably connected to the rotating shaft;

[0025] A number of auxiliary rods are provided between the fixed rod and the rear rotating rod. The bottom ends of the auxiliary rods are all rotatably connected to the auxiliary shaft. The auxiliary shaft is arranged on the front side of the fixed inner mold and directly above the rotating shaft.

[0026] Further optionally, the awning is a sleeve structure with an inner and an outer layer. The rear rotating rod and the fixed rod are respectively arranged on both sides of the awning. A number of auxiliary rods are evenly arranged along the circumference of the fixed inner mold inside the inner layer of the awning, that is, inside the awning, directly facing the front side of the fixed inner mold; when the rear rotating rod rotates, it drives the awning to unfold into a fan shape, and the auxiliary rods support the awning. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of the processing equipment for plastic bending forming of round bamboo (the situation of multiple rotating positions of the middle rotating rod is shown in this figure);

[0028] Figure 2 It is a top view schematic diagram of the second slide rail;

[0029] Figure 3 It is a partial schematic diagram of the front rotating rod;

[0030] Figure 4 It is a schematic diagram of the cooperation between the rotation forming mechanism and the forming auxiliary mechanism (front side of the fixed inner mold);

[0031] Figure 5 It is a schematic diagram of the rear side of the fixed inner mold;

[0032] Figure 6 It is a schematic diagram of the cooperation between the tail rod and the cross bar.

[0033] In the attached drawings, 1 is a fixed inner mold, 2 is a base, 3 is a first slide rail, 4 is a second slide rail, 5 is a first fixed outer mold, 6 is a second fixed outer mold, 7 is a middle rotating rod, 8 is a clamping wheel, 9 is a through hole, 10 is a first threaded rod, 11 is a second threaded rod, 12 is a first main board, 13 is a second main board, 14 is a third main board, 15 is a first auxiliary rod, 16 is a second auxiliary rod, 17 is a pressing plate, 18 is a rotating shaft, 19 is a clamping piece, 20 is a front rotating rod, 21 is a rear rotating rod, 22 is a fixed rod, 23 is a pre-pressing wheel, 24 is a shed, 25 is a protective piece, 26 is a tail rod, 27 is an auxiliary rod, 28 is a secondary shaft, 29 is a cross bar. Detailed implementation method

[0034] This embodiment provides a processing device for plastic bending and forming of round bamboo. As Figures 1 - 6 shown, it includes a fixed inner mold 1, a base 2 and a rotating forming mechanism. The fixed inner mold 1 is arranged in the middle of the base 2. The upper surface of the fixed inner mold 1 is semi-circular. A first slide rail 3 and a second slide rail 4 are respectively arranged on both sides of the fixed inner mold 1. The first fixed outer mold 5 is slidably connected to the first slide rail 3, and the second fixed outer mold 6 is slidably connected to the second slide rail 4, which are used to fix the positions of both ends of the bent bamboo.

[0035] One end of the middle rotating rod 7 of the rotating forming mechanism takes the center of the fixed inner mold 1 as the center of rotation to drive the middle rotating rod 7 to rotate. A clamping wheel 8 is arranged on the middle rotating rod 7. The clamping wheel 8 always contacts the outer surface of the bamboo, and during the rotation with the middle rotating rod 7, the clamping wheel 8 presses the bamboo against the surface of the fixed inner mold 1 to perform plastic bending and forming.

[0036] Optionally, the bottom of the fixed inner mold 1 is fixed on the upper surface of the base 2. The first slide rail 3 and the second slide rail 4 are horizontally arranged on the left and right sides of the fixed inner mold 1. The fixed inner mold 1 has a certain width in the front and rear directions for carrying the bamboo.

[0037] The width of the first slide rail 3 in the front and rear directions is not less than the width of the fixed inner mold 1, and the center line of the first slide rail 3 along the length direction of the first slide rail 3 coincides with the center line of the fixed inner mold 1, so that the first fixed outer mold 5 can be directly opposite to the bamboo on the fixed inner mold 1. A through hole 9 is arranged at the position where the first slide rail 3 is docked with the fixed inner mold 1. The fixed end of the bamboo is vertically inserted into the through hole 9.

[0038] One side of the base 2 provided with the second slide rail 4 protrudes backward from the fixed inner mold 1, so that the front surface of this side of the base 2 is flush with the rear surface of the fixed inner mold 1, without affecting the movement and bending of the movable bending end of the bamboo towards the fixed inner mold 1. That is, the center line of the second slide rail 4 along the length direction of the second slide rail 4 is parallel to the center line of the fixed inner mold 1, but is arranged with a front and rear offset.

[0039] Optionally, a first positioning structure is provided on the outer side of the first slide rail 3 for moving and positioning the position of the first fixed outer mold 5; the first positioning structure includes a first support frame and a first threaded rod 10. The first support frame includes a first main board 12 and first auxiliary rods 15 on both sides thereof. The bottom of the first main board 12 is fixedly connected to one end of the first slide rail 3 away from the fixed inner mold 1. The two sides of the first main board 12 are respectively connected to the first auxiliary rods 15. The other ends of the two first auxiliary rods 15 are respectively fixedly connected to the front end face and the rear end face of the fixed inner mold 1 for stabilizing the first main board 12. The first auxiliary rods 15 are parallel to the first slide rail 3;

[0040] The outer surface of the first threaded rod 10 is provided with external threads. One end thereof is used to contact and push the first fixed outer mold 5, and the other end penetrates through the first main board 12 and a rotating handle is provided. The rotating handle is arranged outside the first main board 12;

[0041] Internal threads are provided on the inner side surface of the first main board 12 that surrounds the first threaded rod 10 for cooperating with the rotation of the first threaded rod 10 and fixing the position of the first threaded rod 10.

[0042] Further optionally, the side surface of the first fixed outer mold 5 facing the fixed inner mold 1 has a concave surface protruding away from the fixed inner mold 1 for adapting to the surface of the round bamboo, so that the bamboo is fixed more firmly and stably;

[0043] A silica gel pad is provided on the concave surface of the first fixed outer mold 5 for protecting the bamboo and reducing stress.

[0044] During use, the fixed end of the round bamboo is vertically inserted into the through hole 9. The through hole 9 can penetrate the bottom surface of the base 2 to adapt to the lengths of different bamboos. One side of the bamboo is closely attached to the outer surface of the fixed inner mold 1. The rotating handle is rotated, so that the first threaded rod 10 rotates forward and contacts and pushes the first fixed outer mold 5 to move towards the fixed inner mold 1 until the concave surface of the first fixed outer mold 5 abuts against the other side of the bamboo. The first threaded rod 10 is fixed in position through the internal threads of the first main board 12, so that the positions of the first threaded rod 10, the first fixed outer mold 5 and the bamboo are fixed, and the bamboo is clamped.

[0045] Since the stress of the bamboo is relatively concentrated during the subsequent process of the rotating rod pressing and deforming the bamboo, it is easy to cause cracking. Therefore, the inner diameter of the through hole is slightly larger than the outer diameter of the bamboo. When the middle rotating rod rotates and presses the bamboo, the first fixed outer mold 5 appropriately and slightly relaxes the bamboo in a timely manner, so that the bamboo has a small amount of surplus when bending and can move slightly to avoid stress concentration.

[0046] Optionally, a second positioning structure is provided on the outer side of the second slide rail 4 for moving and positioning the second fixed outer mold 6; the second positioning structure includes a second support frame and a second threaded rod 11. The second support frame includes a second main board 13, a third main board 14, and second auxiliary rods 16 on both sides of the second main board 13 and the third main board 14. The bottom of the second main board 13 and the bottom of the third main board 14 are respectively fixedly connected to one end of the second slide rail 4 away from the fixed inner mold and one end close to the fixed inner mold 1. The second auxiliary rods 16 are connected to both sides of the second main board 13 and the third main board 14 for stabilizing the second main board 13 and the third main board 14. The second auxiliary rods 16 are parallel to the second slide rail 4;

[0047] The outer surface of the second threaded rod 11 is provided with an external thread. One end of it is used to contact and push the second fixed outer mold 6, and the other end penetrates through the second main board 13, and a rotating handle is provided. The rotating handle is arranged outside the second main board 13;

[0048] On the inner side surface of the second main board 13 that surrounds the second threaded rod 11 and inside the second main board 13, an internal thread is provided for cooperating with the rotation of the second threaded rod 11 and fixing the position of the second threaded rod 11.

[0049] Further optionally, a pressing plate 17 is provided on the side of the second fixed outer mold 6 facing the front of the base 2. The pressing plate 17 is provided with a through hole for the second auxiliary rod 16 close to the front of the base 2 to penetrate through the pressing plate 17. The pressing plate 17 can move together with the second fixed outer mold 6;

[0050] The side surface of the pressing plate 17 facing the fixed inner mold 1 has a concave surface protruding away from the fixed inner mold 1. A silica gel pad is provided on the concave surface of the pressing plate 17 for protecting the bamboo material and reducing stress.

[0051] After the bamboo material is pressed by the clamping wheel 8 against the outer surface of the entire fixed inner mold 1, one side of the movable bending end of the bamboo material closely adheres to the outer surface of the fixed inner mold 1. Rotate the rotating handle of the second positioning structure, so that the second threaded rod 11 rotates forward, contacts and pushes the second fixed outer mold 6 to move towards the fixed inner mold 1. At the same time, the pressing plate 17 moves together with the second fixed outer mold 6 until the concave surface of the pressing plate 17 tightly abuts against the other side of the bamboo material. The second threaded rod 11 is fixed in position through the internal thread of the second main board 13, so that the positions of the second threaded rod 11, the second fixed outer mold 6, and the bamboo material are fixed, and the bamboo material is clamped. The length of the second slide rail 4 can be slightly longer, so that the third main board 14 is located at the rear side of the fixed inner mold 1, thus not affecting the movement of the second fixed outer mold 6.

[0052] Optionally, the rotary forming mechanism is arranged on the rear side of the fixed inner mold 1 and includes a middle rotating rod 7, a clamping wheel 8 and a rotating shaft 18. One end of the middle rotating rod 7 is connected to the rotating shaft 18. The rotating shaft 18 is fixed at the center of the rear side of the fixed inner mold 1 and is connected to a driving motor for driving the rotating shaft 18 and the middle rotating rod 7 to rotate. The driving motor is arranged on the front side or the rear side of the fixed inner mold 1.

[0053] The axle of the clamping wheel 8 is horizontally arranged and connected to the front side of the middle rotating rod 7, so that the clamping wheel 8 can rotate in the vertical direction; the width of the clamping wheel 8 is not less than the width of the fixed inner mold 1. A clamping piece 19 parallel to the middle rotating rod 7 is arranged at the end of the axle of the clamping wheel 8 far from the middle rotating rod 7, and the position of the clamping piece 19 is fixed.

[0054] The bottom end of the clamping piece 19 clamps the front side of the fixed inner mold 1, so that the clamping wheel 8 rolls stably along the upper surface of the fixed inner mold 1.

[0055] Further optionally, silica gel pads, steel ring plates and silica gel pads are sequentially arranged on the wheel surface of the clamping wheel 8 from the inside to the outside. When the wheel surface of the clamping wheel 8 rolls the bamboo material, it can not only reduce the stress of bamboo bending and avoid cracking, but also provide sufficient strength to press the bamboo material for shaping.

[0056] Optionally, the center position of the fixed inner mold 1 is higher than the first slide rail 3 and the second slide rail 4. The first slide rail 3 and the second slide rail 4 are at the same height. Both sides of the bottom of the fixed inner mold 1 respectively have a vertical surface, and the two end vertical surfaces respectively face the first slide rail 3 and the second slide rail 4, which is convenient for the first fixed outer mold 5 and the second fixed outer mold 6 to fix the bamboo material after plastic bending forming, and does not hinder the rotation of the middle rotating rod 7 at the same time.

[0057] Further optionally, the semi-circular upper surface of the fixed inner mold 1 has a concave surface protruding downward, and a silica gel pad is arranged on the concave surface, which is easy to position the round bamboo material and eliminate stress concentration. When it is required to use bamboo materials with different diameters for the fixed inner mold 1, the concave surface of the fixed inner mold 1 is removed.

[0058] The processing equipment for plastic bending forming of round bamboo described in the present invention is applicable to small-diameter bamboo materials with a diameter of 3-5 cm, a wall thickness greater than 3 mm, relatively long internodes and not very prominent. Before bending processing, first punch through the inner nodes of the small-diameter bamboo material to avoid bursting in the softening tank, and then put it into a saturated steam softening tank for softening. The softening temperature is 160-180 °C and the softening time is 7-10 minutes.

[0059] After the fixed end of the bamboo is fixed, the round bamboo is bent and shaped based on the aging forming theory. The middle rotating rod 7 is horizontal and close to one side of the first sliding rail 3. The middle rotating rod 7 is at the rear side of the fixed inner mold 1 and its movement is not hindered by other devices. The clamping piece 19 of the clamping wheel 8 can clamp the front side of the fixed inner mold 1, so that the wheel surface of the clamping wheel 8 can rotate along the upper surface of the fixed inner mold 1. The bamboo is inserted between the clamping wheel 8 and the fixed inner mold 1. The rotating shaft 18 drives the middle rotating rod 7 to rotate (i.e., draw a semi-circle). Wherever the clamping wheel 8 reaches, it presses the bamboo to bend and closely adhere to the fixed inner mold 1. The wheel surface of the clamping wheel 8 makes rolling contact with the bamboo, and has the above-mentioned silica gel pad and steel plate, which can smoothly contact the bamboo, reduce stress, and at the same time bend according to the shape of the fixed inner mold 1, improving the stability and accuracy of shaping. When the middle rotating rod 7 rotates to the horizontal position again and is close to the second sliding rail 4, the semi-circular shaping of the bamboo is completed. The pressing piece of the second fixed outer mold 6 presses the movable free end of the bamboo. All components stop loading but do not unload the force. Under the conditions of maintaining constant load and constant temperature (80 - 120 °C, determined according to the wall thickness of the round bamboo), it is maintained for 10 minutes, then cooled down, the force is not unloaded, and then maintained for 30 minutes. Then, the first fixed outer mold 5 and the second fixed outer mold 6 are loosened, the bamboo is taken out, and subsequent maintenance and processing are carried out.

[0060] Optionally, the processing equipment for plastic bending and forming of the round bamboo further includes a forming auxiliary mechanism to enhance the plasticity of the bamboo. The forming auxiliary mechanism includes a front rotating rod 20, a rear rotating rod 21, and a fixed rod 22. The front rotating rod 20 is on the side of the middle rotating rod 7 close to the second sliding rail 4, and the rear rotating rod 21 is on the side of the middle rotating rod 7 close to the first sliding rail 3, and their relative positions with the middle rotating rod 7 are fixed, that is, the front rotating rod 20 and the rear rotating rod 21 rotate at the same speed as the middle rotating rod 7.

[0061] A pre-pressing wheel 23 is provided on the front rotating rod 20 for pre-contacting and pre-pressing the bamboo in advance.

[0062] The fixed rod 22 is fixed at the starting position of the rotation of the rear rotating rod 21. A foldable and retractable awning 24 is sleeved between the rear rotating rod 21 and the fixed rod 22 for maintaining the bent bamboo fixed on the fixed inner mold 1 by the clamping wheel 8. The distance between the rear rotating rod 21 and the middle rotating rod 7 is relatively small, and the distance between the front rotating rod 20 and the middle rotating rod 7 does not exceed 1 / 6 of the length of the upper surface of the fixed inner mold 1.

[0063] Further optionally, the front rotating rod 20 is at the rear side of the fixed inner mold 1, and the bottom end of the front rotating rod 20 is fixedly connected to the rotating shaft 18, so that the rotating shaft 18 can drive the front rotating rod 20 to rotate together; the front rotating rod 20 can be arranged on the front side or the rear side of the middle rotating rod 7.

[0064] The height of the pre-pressing wheel 23 is higher than that of the clamping wheel 8. The axle of the pre-pressing wheel 23 is horizontally arranged and connected to the front side surface of the front rotating rod 20, enabling the pre-pressing wheel 23 to rotate in the vertical direction. The width of the pre-pressing wheel 23 can cover the width of the bamboo material. A protective piece 25 parallel to the front rotating rod 20 is provided at one end of the axle of the pre-pressing wheel 23 away from the front rotating rod 20. The position of the protective piece 25 is fixed and is used to gather the bamboo material between the front rotating rod 20 and the protective piece 25, so that the bamboo material can be rolled by the pre-pressing wheel 23.

[0065] Further optionally, a silica gel pad is provided on the wheel surface of the pre-pressing wheel 23, and a hose is provided above the pre-pressing wheel 23 for continuously applying a protective agent to the wheel surface of the pre-pressing wheel 23; the hose is connected to an external protective agent storage tank and a pump, and the hose is arranged along the front rotating rod.

[0066] During use, the front rotating rod 20 is always in front of the rotation trajectory of the middle rotating rod 7, and preliminary pre-pressing is performed on the bamboo material that has not yet been pressed by the clamping wheel 8. The bamboo material is placed between the front rotating rod 20 and the protective piece 25. The front rotating rod 20 rotates with the rotating shaft 18, and the pre-pressing wheel 23 rolls on the surface of the bamboo material. Since the rotation trajectory of the front rotating rod 20 is also semi-circular, only the rotation radius of the pre-pressing wheel 23 is larger than that of the clamping wheel 8, and preliminary pre-pressing is performed on the upwardly warped bamboo material that has not yet been bent. The protective agent flows to the surface of the pre-pressing wheel 23, and the pre-pressing wheel 23 directly coats the protective agent on the upper surface of the bamboo material through its own rotation, which helps to reduce cracking of the bamboo material under the subsequent pressing and shaping by the clamping wheel 8. The protective agent is a natural protective agent such as rosin and tung oil.

[0067] When the front rotating rod 20 rotates to a horizontal position close to the second slide rail 4, the front rotating rod 20 can be immediately removed to prevent the front rotating rod 20 from continuing to rotate along the circular trajectory and bumping against the bottom of the fixed inner mold 1. Further optionally, a multi-prismatic rotating shaft 18 is connected to the rear side of the rotating shaft 18, and a multi-prismatic nut is provided at the bottom end of the front rotating rod 20, which is fitted onto the multi-prismatic rotating shaft 18, enabling the rotating shaft 18 to drive the front rotating rod 20 to rotate. When removing, the front rotating rod 20 can be pulled out backward, which is simple and fast.

[0068] Further optionally, the rear rotating rod 21 and the fixed rod 22 are located on the front side of the fixed inner mold 1. The rotating shaft 18 passes through the fixed inner mold 1 and protrudes from the front side surface of the fixed inner mold 1. The bottom end of the rear rotating rod 21 is fixedly connected to the rotating shaft 18, and the bottom end of the fixed rod 22 is rotatably connected to the rotating shaft 18;

[0069] A plurality of auxiliary rods 27 are provided between the fixed rod 22 and the rear rotating rod 21. The bottom ends of the auxiliary rods 27 are all rotatably connected to the secondary shaft 28, and the secondary shaft 28 is provided on the front side surface of the fixed inner mold 1 and directly above the rotating shaft 18.

[0070] Further optionally, the awning 24 is a sheath structure with an inner layer and an outer layer. The rear rotating rod 21 and the fixed rod 22 are respectively arranged on both sides of the awning 24. A plurality of auxiliary rods 27 are evenly arranged along the circumference of the fixed inner mold 1 inside the inner layer of the awning 24, that is, inside the awning 24, directly facing the front side of the fixed inner mold 1; when the rear rotating rod 21 rotates, it drives the awning 24 to unfold into a fan shape, and the auxiliary rods 27 support the awning 24.

[0071] The lengths of the rear rotating rod 21, the fixed rod 22, and the auxiliary rods 27 are all greater than the radius of the fixed inner mold 1, and cross bars 29 parallel to the upper surface of the fixed inner mold 1 are provided at the tops of the three. The cross bars 29 are perpendicular to the front and rear sides of the fixed inner mold 1 and span across the upper surface of the fixed inner mold 1; at the other end of each cross bar 29, a tail rod 26 parallel to the rear side of the fixed inner mold 1 is provided. The tail rods 26 all point to the center of the rear side of the fixed inner mold 1, and the bottom ends of the tail rods 26 exceed the upper surface of the fixed inner mold 1, so that the awning 24 can cover the bent bamboo on the fixed inner mold 1; the cross bars 29 and the tail rods 26 are both inside the inner layer of the awning 24. The cross bars 29 directly face the upper surface of the fixed inner mold 1, and the tail rods 26 directly face the rear side of the fixed inner mold 1.

[0072] Further optionally, a plurality of heating wires are provided between the inner layer and the outer layer of the awning 24. The heating wires correspond to the upper surface of the fixed inner mold 1 and are used to heat the bent bamboo on the upper surface of the fixed inner mold 1.

[0073] At the top of each sub-rod and on the side facing the fixed inner mold 1, a spray port is provided. The sub-rod is hollow, and an inlet is provided on the side of the sub-rod near the bottom. It is connected to an external device that provides water mist through a pipeline.

[0074] The present invention performs humid heat curing on the bent bamboo closely attached to the upper surface of the fixed inner mold 1, which is beneficial for the bamboo to maintain the bent shape for a long time and is not easy to crack. Specifically, the starting positions of the fixed rod 22 and the rear rotating rod 21 are at a position slightly below the horizontal and close to the first slide rail 3, but higher than the first slide rail 3, to prevent the awning 24 from affecting the movement of the first threaded rod 10 and the first fixed outer mold 5. After the bamboo is fixed by the first fixed outer mold 5, it also passes through the space between the cross bar 29 and the upper surface of the fixed inner mold 1. At this time, the fixed rod 22, the rear rotating rod 21, and the auxiliary rods 27 are basically overlapped, and the awning 24 is in a contracted and folded state.

[0075] Then, the rotating shaft 18 drives the middle rotating rod 7 and the rear rotating rod 21 to start rotating. Since the rear rotating rod 21 and the auxiliary rod 27 are connected to the baffle 24, the baffle 24 and the auxiliary rod 27 are both lifted by the rear rotating rod 21, and gradually unfold and cover above the fixed inner mold 1. A limiting pier is provided at the position corresponding to the fixed rod 22 on the front side of the fixed inner mold 1. The limiting pier blocks above the fixed rod 22 to prevent the fixed rod 22 from being pulled by the baffle 24. At the same time, one end of the fixed rod 22 is connected to the rotating shaft 18 through a bearing, so that the fixed rod 22 does not rotate with the rotating shaft 18. The heating wire in the sandwich layer of the baffle 24 is electrically connected to an external power supply. The heating wire heats the already bent bamboo. At the same time, the auxiliary rod 27 passes through vaporized water mist, and the water mist diffuses evenly in the baffle 24, so that a humid and hot environment is formed inside the baffle 24, which is beneficial to the maintenance of bamboo. As the rear rotating rod 21 rotates, the baffle 24 is gradually unfolded and finally covers the upper part of the entire fixed inner mold 1. When the fixed holding time ends, the middle rotating rod 7 and the rear rotating rod 21 rotate in the reverse direction to reset, the baffle 24 folds and contracts, and then the bamboo is taken off.

[0076] Optionally, a cooling pipe is provided inside the fixed inner mold. The cooling pipe is closely attached to the reverse side of the upper surface of the fixed inner mold, that is, the upper part of this upper surface is used to place the bent bamboo, and the lower part is closely attached to the cooling pipe. Both ends of the cooling pipe pass through the bottom of the fixed inner mold and are connected to a chiller to pass cold water into the cooling pipe to cool the already bent and formed bamboo.

Claims

1. A processing device for plastic bending and forming of round bamboo, characterized in that, It includes a fixed inner mold, a base, and a rotational forming mechanism. The fixed inner mold is arranged in the middle of the base. The upper surface of the fixed inner mold is semi-circular. A first slide rail and a second slide rail are respectively arranged on both sides of the fixed inner mold. A first fixed outer mold is slidably connected to the first slide rail, and a second fixed outer mold is slidably connected to the second slide rail, which is used to fix the positions of both ends of the bent bamboo. One end of the middle rotating rod of the rotational forming mechanism takes the center of the fixed inner mold as the pivot to drive the middle rotating rod to rotate. A clamping wheel is arranged on the middle rotating rod. The clamping wheel always contacts the outer surface of the bamboo, and during the rotation with the middle rotating rod, the clamping wheel presses the bamboo tightly against the surface of the fixed inner mold for plastic bending and forming. The processing equipment for the plastic bending and forming of round bamboo also includes a forming auxiliary mechanism. The forming auxiliary mechanism includes a front rotating rod, a rear rotating rod, and a fixed rod. The front rotating rod is on the side of the middle rotating rod close to the second slide rail, and the rear rotating rod is on the side of the middle rotating rod close to the first slide rail, and their relative positions with the middle rotating rod are fixed. The front rotating rod and the rear rotating rod rotate at the same speed as the middle rotating rod. A pre-pressing wheel is arranged on the front rotating rod, which is used to contact and pre-press the bamboo in advance. The fixed rod is fixed at the starting position of the rotation of the rear rotating rod. A foldable and retractable awning is sleeved between the rear rotating rod and the fixed rod, which is used to maintain the bent bamboo fixed on the fixed inner mold by the clamping wheel. The front rotating rod is at the rear side of the fixed inner mold. The bottom end of the front rotating rod is fixedly connected to a rotating shaft, so that the rotating shaft can drive the front rotating rod to rotate together. The height of the pre-pressing wheel is higher than that of the clamping wheel. The axle of the pre-pressing wheel is horizontally arranged and connected to the front side of the front rotating rod, so that the pre-pressing wheel can rotate in the vertical direction. The width of the pre-pressing wheel can cover the width of the bamboo. A protective piece parallel to the front rotating rod is arranged at the end of the axle of the pre-pressing wheel far from the front rotating rod. The position of the protective piece is fixed, which is used to gather the bamboo between the front rotating rod and the protective piece, so that the bamboo can be rolled by the pre-pressing wheel. The rear rotating rod and the fixed rod are at the front side of the fixed inner mold. The rotating shaft penetrates the fixed inner mold and protrudes from the front side of the fixed inner mold. The bottom end of the rear rotating rod is fixedly connected to the rotating shaft, and the bottom end of the fixed rod is rotatably connected to the rotating shaft. A number of auxiliary rods are arranged between the fixed rod and the rear rotating rod. The bottom ends of the auxiliary rods are all rotatably connected to auxiliary shafts. The auxiliary shafts are arranged on the front side of the fixed inner mold and directly above the rotating shaft. The awning is a sleeve structure with an inner and an outer layer. The rear rotating rod and the fixed rod are respectively arranged on both sides of the awning. A number of auxiliary rods are evenly arranged along the circumference of the fixed inner mold inside the inner layer of the awning, directly facing the front side of the fixed inner mold. When the rear rotating rod rotates, it drives the awning to unfold into a fan shape, and the auxiliary rods support the awning.

2. The processing equipment for plastic bending forming of round bamboo according to claim 1, characterized in that, The first slide rail and the second slide rail are horizontally arranged on the left and right sides of the fixed inner mold. The fixed inner mold has a width in the front and rear directions, which is used to carry the bamboo. The width of the first slide rail in the front and rear directions is not less than the width of the fixed inner mold, and the center line of the first slide rail along its length coincides with the center line of the fixed inner mold, so that the first fixed outer mold can be directly opposite to the bamboo on the fixed inner mold. A through hole is arranged at the docking position of the first slide rail and the fixed inner mold, which is used for the fixed end of the bamboo to be vertically inserted into the through hole. One side of the base with the second slide rail protrudes backward towards the rear of the fixed inner mold, making the front surface of this side of the base flush with the rear surface of the fixed inner mold, without affecting the movement and bending of the movable bending end of the bamboo towards the fixed inner mold.

3. The processing equipment for plastic bending forming of round bamboo according to claim 2, characterized in that, A first positioning structure is provided outside the first slide rail, including a first support frame and a first threaded rod. The first support frame includes a first main board and first sub-rods on both sides thereof. The bottom of the first main board is fixedly connected to one end of the first slide rail away from the fixed inner mold. The two sides of the first main board are respectively connected to the first sub-rods. The other ends of the two first sub-rods are respectively fixedly connected to the front end face and the rear end face of the fixed inner mold for stabilizing the first main board. The first sub-rods are parallel to the first slide rail. The outer surface of the first threaded rod is provided with an external thread. One end thereof is used to contact and push the first fixed outer mold, and the other end penetrates through the first main board and a rotating handle is provided. The rotating handle is arranged outside the first main board. Internal threads are provided on the inner side surface of the first main board surrounding the first threaded rod for cooperating with the rotation of the first threaded rod and fixing the position of the first threaded rod.

4. The processing equipment for plastic bending forming of round bamboo according to claim 3, characterized in that, A second positioning structure is provided outside the second slide rail, including a second support frame and a second threaded rod. The second support frame includes a second main board, a third main board and second sub-rods on both sides of the second main board and the third main board. The bottom of the second main board and the bottom of the third main board are respectively fixedly connected to one end of the second slide rail away from the fixed inner mold and one end close to the fixed inner mold. The two sides of the second main board and the third main board are respectively connected to the second sub-rods for stabilizing the second main board and the third main board. The second sub-rods are parallel to the second slide rail. The outer surface of the second threaded rod is provided with an external thread. One end thereof is used to contact and push the second fixed outer mold, and the other end penetrates through the second main board and a rotating handle is provided. The rotating handle is arranged outside the second main board. Internal threads are provided on the inner side surface of the second main board surrounding the second threaded rod for cooperating with the rotation of the second threaded rod and fixing the position of the second threaded rod.

5. The processing equipment for plastic bending forming of round bamboo according to claim 4, characterized in that, A pressing plate is provided on the side of the second fixed outer mold pointing to the front of the base. The pressing plate is provided with through holes for the second sub-rods close to the front of the base to penetrate through the pressing plate. The pressing plate can move together with the second fixed outer mold and fix the movable free end of the bamboo.

6. The processing equipment for plastic bending forming of round bamboo according to claim 5, characterized in that, The rotation forming mechanism is arranged on the rear side surface of the fixed inner mold and includes a middle rotating rod, a clamping wheel and a rotating shaft. One end of the middle rotating rod is connected to the rotating shaft. The rotating shaft is fixed at the center of the rear side surface of the fixed inner mold and is connected to a driving motor. The wheel shaft of the clamping wheel is horizontally arranged and connected to the front side surface of the middle rotating rod, so that the clamping wheel can rotate in the vertical direction. The width of the clamping wheel is not less than the width of the fixed inner mold. A clamping piece parallel to the middle rotating rod is provided at one end of the wheel shaft of the clamping wheel away from the middle rotating rod, and the position of the clamping piece is fixed. The bottom end of the clamping piece clamps the front side surface of the fixed inner mold, so that the clamping wheel rolls stably along the upper surface of the fixed inner mold.

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