A steamer outer ring coiling machine and a manufacturing method of a steamer outer ring

Abstract

A steamer outer ring coiling machine and a manufacturing method of a steamer outer ring, relate to the technical field of softwood material machining, the coiling machine comprises a rack, the rack is provided with an inner ring fixing die and a variable-diameter outer ring whole circle assembly coaxially matched with the inner ring fixing die, at least one of the two is provided with a heating and shaping assembly; the outer ring whole circle assembly contains at least three whole circle pieces arranged along the circumference of the inner ring fixing die, each whole circle piece corresponds to an independent advancing mechanism and can independently move in the radial direction, the clamping gap is adjusted to realize step-by-step coiling of the steamer outer ring raw material; a movable whole position needle is arranged above the corresponding ring forming cavity on the rack, and when step-by-step coiling, the needle goes down and extends into the cavity, the raw material butt joint end is pressed and tightly attached to the outer wall of the inner ring fixing die to form a temporary anti-rebound limiting position, and after the end is pressed and locked, the needle goes up and exits. The present application cancels the manual pre-bending process, reduces the dependence on manual experience and the operation threshold, effectively offsets the springback stress of the raw material, and guarantees the positioning accuracy and the attachment effect of the butt joint end.

Description

Technical Field

[0001] This invention relates to the field of cork material machining technology, and in particular to a steamer outer ring rolling machine and a method for manufacturing the steamer outer ring. Background Technology

[0002] Bamboo steamers are widely used in home kitchens, restaurants, and industrial food production for steaming due to their natural and environmentally friendly materials, excellent air permeability, even steam heat conduction, and ability to preserve the original flavor and texture of food. The main body of a bamboo steamer typically consists of a bamboo steamer body and an outer ring (also called a hoop) around its circumference. The core function of the outer ring is to provide circumferential restraint to the bamboo body of the steamer, effectively preventing cracking, deformation, or disintegration during repeated use in dry and wet conditions. It is a key component ensuring the overall structural stability and lifespan of the steamer. Currently, the production of bamboo steamers and their outer rings still mainly relies on traditional handcrafting, a complex process that typically involves multiple steps, including cutting the bamboo into strips, softening it at high temperatures, manually rolling it into a circle, fixing the joints, and subsequent anti-mold carbonization treatment.

[0003] In the prior art, Chinese invention patent application number 202011073660.4 discloses a device for rounding and shaping the outer frame of a steamer. This device mainly includes a frame, an inner ring rounding mechanism, an outer ring rounding mechanism, a diameter-changing drive mechanism, and a temperature control device. It uses a radially expandable inner ring tensioning block that cooperates with a fixed outer ring shaping ring, or both the inner and outer rings are diameter-changing devices, to compress the initially formed outer frame of the steamer from both the inner and outer sides, while simultaneously heating and shaping it. The technical advantage of this prior art is that it enables semi-automated operation, and through precise temperature control, it partially carbonizes the inner and outer surfaces of the bamboo strips to form a protective layer, thereby improving production efficiency and product quality consistency, and reducing manual labor intensity.

[0004] However, whether it is the aforementioned rolling and shaping device or other mechanical shaping solutions in the industry that use mold pressing or radial pressure, their structural design shares a common premise in principle: the two ends of the bamboo strip blank must be joined together first, and then manually bent and fixed into an approximate closed ring before it can be fitted into the subsequent shaping mold or device for final shaping and strengthening. This indispensable and high-intensity manual pre-bending process is highly dependent on the operator's feel and experience, and places extremely high demands on the operator's force control and spatial judgment ability. This leads to low production efficiency, poor product quality stability, and difficulty in achieving standardized and large-scale production, becoming a technical bottleneck restricting the upgrading of the bamboo steamer industry. Summary of the Invention

[0005] The present invention aims to solve the problem of poor finished product quality caused by the requirement that the outer ring of existing bamboo steamers must be manually bent and fixed into a near-closed circular blank before subsequent shaping operations.

[0006] According to one aspect of the present invention, a steamer outer ring rolling machine is provided, comprising a frame, an inner ring fixing mold and an outer ring rounding assembly coaxially cooperating with the inner ring fixing mold are provided on the frame, a heating and shaping assembly is provided on the inner ring fixing mold and / or the outer ring rounding assembly, the outer ring rounding assembly is a variable diameter device, and after the outer ring rounding assembly retracts inward to the end of its stroke, it forms an annular forming cavity with the outer wall of the inner ring fixing mold for accommodating the raw material of the steamer outer ring; the outer ring rounding assembly includes at least three rounding parts arranged circumferentially along the inner ring fixing mold, each rounding part being respectively connected to an independent pusher. The mechanism includes a propulsion mechanism that drives the corresponding round part to move independently along the radial direction of the inner ring fixing mold to adjust the clamping gap between the corresponding round part and the inner ring fixing mold, thereby realizing the step-by-step rolling of the outer ring material of the steamer. A movable positioning pin is provided on the frame above the annular forming cavity. The positioning pin is configured to extend downward into the annular forming cavity during the step-by-step rolling of each round part, and press the mating end of the outer ring material of the steamer against the outer wall of the inner ring fixing mold through horizontal feeding to form a temporary anti-springback limit. After the mating end of the material is pressed and locked by the round part, it moves upward and exits the annular forming cavity.

[0007] As a preferred embodiment of the above technical solution, four circular components are provided, namely, a positive circular component, a rear circular component, a first side circular component, and a second side circular component arranged sequentially along the circumference of the inner ring fixing mold. The rear circular component is arranged opposite to the positive circular component, and the first side circular component is arranged opposite to the second side circular component.

[0008] As a preferred embodiment of the above technical solution, a lifting ring for ejecting the finished product is provided on the frame below the annular forming cavity. The lifting ring is coaxially sleeved on the outside of the inner ring fixing mold. The inner diameter of the lifting ring is greater than the outer diameter of the inner ring fixing mold and less than or equal to the outer diameter of the annular forming cavity in the forming state. A lifting drive mechanism is connected to the bottom of the lifting ring, and the lifting drive mechanism is used to drive the lifting ring to move up and down along the axial direction of the inner ring fixing mold.

[0009] As a preferred embodiment of the above technical solution, the frame is further provided with a positioning block for positioning the end of the outer ring of the steamer material; the positioning block is fixedly disposed on one side of the frame corresponding to the first side round piece, and is located between the positive positioning round piece and the first side round piece.

[0010] As a preferred embodiment of the above technical solution, at least the upper ends of the first side rounding component and the second side rounding component are provided with longitudinal anti-bounce portions, and the longitudinal anti-bounce portions at least cover part of the area above the molding cavity. As a preferred embodiment of the above technical solution, the positioning pin has at least one micro-exposure port on its pressing end facing the inner ring fixing mold, and the opening position of the micro-exposure port corresponds to the joint position of the outer ring material of the steamer when the positioning pin is pressed.

[0011] As a preferred embodiment of the above technical solution, the heating and shaping assembly includes an inner heating rod and an outer heating rod; the inner ring fixing mold and each round component are all integral structures of high thermal conductivity metal, and each has a vertically opened receiving hole inside, and the inner heating rod and the outer heating rod are correspondingly inserted into the receiving holes of the inner ring fixing mold and each round component.

[0012] A method for rolling the outer ring of a steamer, implemented using the steamer outer ring rolling machine described in any one of the technical solutions of the claims, includes the following steps: S1 Raw material pretreatment: preparing a raw material to be processed, which is composed of an inner ring plate and two outer ring plates bonded together; S2 Feeding and positioning: placing the raw material to be processed in a U-shape between the inner ring fixing mold and the outer ring round assembly, so that the inner ring plate is bonded to the outer wall of the inner ring fixing mold, and positioning one end of the raw material against the positioning block; S3 Step-by-step rolling of the round: driving each round component to move inward in sequence according to a preset order, causing the raw material to bend and deform step by step. During the process, the positioning pin presses and limits the joint ends of the raw material to prevent springback. After the two ends of the raw material are bonded together and pressed and locked by the round component, the positioning pin retracts and resets. Finally, each round component together presses the raw material against the outer wall of the inner ring fixing mold to form a complete outer ring of the steamer.

[0013] S4 Heating and Shaping: The heating and shaping component is activated to heat the outer ring of the steamer in the clamped state, and maintains pressure and shaping at the preset temperature for the preset time; S5 Demolding and Part Removal: After the heating and shaping is completed, each pushing mechanism drives the corresponding round part to move outward and reset, and the lifting ring moves upward to lift the shaped outer ring of the steamer, and removes the part after it is separated from the inner ring fixing mold.

[0014] As a preferred embodiment of the above technical solution, the specific steps of the raw material pretreatment in step S1 are as follows: cut out two outer ring plates and one inner ring plate of the same size, wherein the width of the outer ring plate is less than half the width of the inner ring plate and the length of the outer ring plate is greater than the length of the inner ring plate; remove the outer skin from the surfaces of the inner ring plate and the outer ring plate, and cut a butt joint bevel at one end of the two outer ring plates; after applying glue to the mating surfaces of the inner ring plate and the outer ring plate, attach and fix the two outer ring plates to the same side of the inner ring plate along the width direction to obtain the raw material to be processed.

[0015] As a preferred embodiment of the above technical solution, the specific steps of step S3, which involves rolling the round piece in stages, are as follows: S3.1 The pushing mechanism corresponding to the rear round piece drives the rear round piece to move inward, clamping the corresponding part of the raw material; S3.2 The pushing mechanism corresponding to the first round piece drives the first round piece to move inward to the end of its stroke, causing the corresponding part of the raw material to bend and deform inward; S3.3 The lifting displacement driving mechanism drives the positioning pin to move downward to the corresponding position of the end of the raw material, and then drives the positioning pin to move towards the rear round piece, pressing the end of the raw material tightly against the outer wall of the inner ring fixing mold; S3.4 The pushing mechanism corresponding to the second round piece drives the first round piece to move inward to the end of its stroke, causing the corresponding part of the raw material to bend and deform inward; S3.4 The pushing mechanism corresponding to the second round piece drives the first round piece to move inward to the end of its stroke, causing the corresponding part of the raw material to bend and deform inward; The two round parts move inward to the end of their stroke, causing the corresponding parts of the raw material to bend inward, so that the second end of the raw material abuts against the first end that was originally against the positioning block; S3.5 The propulsion mechanism corresponding to the positioning round part drives the positioning round part to move inward to the predetermined position, abuts against the second end of the raw material and causes it to bend inward, so that the second end of the raw material continues to bend and causes the first end of the raw material to be compacted; then the lifting displacement drive mechanism drives the positioning pin to retract upward and reset; S3.6 The propulsion mechanism corresponding to the positioning round part drives the positioning round part to continue to move inward to the end of its stroke, so that all the round parts together press the raw material against the outer wall of the inner ring fixed mold, forming a complete outer ring of the steamer.

[0016] In summary, the present invention has the following advantages:

[0017] 1. This invention achieves step-by-step progressive rolling of the outer ring material of the steamer by using multiple sets of circular parts that can move independently along the inner ring fixed mold. This completely eliminates the indispensable manual pre-bending into a closed ring process in the traditional process, freeing the production process from high dependence on manual operation experience and greatly reducing the operation threshold. With the help of movable positioning pins to temporarily prevent springback at the joint end of the material during the step-by-step rolling process, it can effectively offset the springback stress generated during the bending of the bamboo material and ensure the positioning accuracy and bonding effect of the joint end of the material.

[0018] 2. Furthermore, the lifting ring structure coaxially sleeved on the outside of the inner ring fixed mold can achieve non-destructive demolding of the finished product through uniform axial lifting action after the shaping is completed, completely avoiding the problems of scratches, roundness damage or even cracking and scrapping of the finished product caused by traditional manual demolding.

[0019] 3. Furthermore, the positioning blocks on the frame provide a precise initial positioning reference for raw material feeding, eliminating the need for repeated manual adjustments to the raw material position. This reduces the difficulty of feeding operations and ensures the consistency of the initial positioning of each product, thus avoiding finished product size errors caused by initial positioning deviations. The longitudinal anti-bounce part on the upper end of the round part can form a stable axial limit on the raw material during the rolling process, effectively restraining the vertical bounce displacement of the raw material and preventing production interruptions or raw material scrapping caused by the raw material coming out of the forming cavity. This significantly improves the continuity and stability of equipment operation.

[0020] Further or other beneficial effects will be discussed in the embodiments. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the present invention after concealing the corresponding structure of the alignment pin;

[0023] Figure 3 This is a schematic diagram showing the relative positional relationship between the inner ring fixing mold and the receiving hole of the present invention;

[0024] Figure 4 This is a schematic diagram showing the relationship between the various structures when the lifting ring is in the extended state.

[0025] Figure 5 This is a schematic diagram of the corresponding structure of the integer pointer;

[0026] Figure 6 This is a magnified view of the integer part number;

[0027] Figure 7 This is a schematic diagram of the structure before the inner and outer ring plates are assembled.

[0028] Figure 8 This is a schematic diagram of the outer ring structure of the steamer produced by this invention;

[0029] Figure 9 A schematic diagram illustrating the manufacturing process of the outer ring of a steamer.

[0030] Among them, 1-frame, 2-inner ring fixing mold, 201-inner ring receiving hole, 31-positive positioning round part, 32-rear positioning round part, 33-first side round part, 34-second side round part, 301-longitudinal bulletproof port, 302-round part receiving hole, 4-propulsion mechanism, 5-positioning pin, 51-glue outlet, 501-lifting displacement drive mechanism, 6-lifting ring, 7-positioning block, a-inner ring plate, b-outer ring plate, b1-butting inclined surface. Detailed Implementation

[0031] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the construction shown in the accompanying drawings. The terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive.

[0032] The present invention will be further explained below with reference to the embodiments:

[0033] A steamer outer ring rolling machine, referring to Figure 1 , Figure 2 and Figure 3 A vertically arranged inner ring fixing mold 2 is fixedly installed in the middle of the frame 1. The outer diameter of the inner ring fixing mold 2 matches the designed inner diameter of the outer ring of the steamer to be produced. An outer ring rounding assembly is provided on the frame 1, which is coaxially fitted with the inner ring fixing mold 2. A heating and shaping assembly is provided on the inner ring fixing mold 2 and / or the outer ring rounding assembly. The outer ring rounding assembly is a variable diameter device. After the outer ring rounding assembly retracts inward to the end of its stroke, it forms an annular forming cavity with the outer wall of the inner ring fixing mold 2 to accommodate the raw material of the outer ring of the steamer. The radial thickness of the annular forming cavity matches the thickness of the raw material to be processed, which can stably clamp the raw material during the rolling process and ensure a precise roundness forming effect.

[0034] The outer ring circular assembly includes at least three circular parts arranged circumferentially along the inner ring fixed mold 2. Each circular part is connected to an independent propulsion mechanism 4. The propulsion mechanism 4 is fixedly mounted on the frame 1, and its output end is fixedly connected to the back side of the corresponding circular part. It is used to drive the corresponding circular part to move independently radially along the inner ring fixed mold 2, thereby adjusting the clamping gap between the corresponding circular part and the inner ring fixed mold 2, and realizing the step-by-step rolling of the outer ring raw material of the steamer. The propulsion mechanism 4 can be a drive device that can achieve precise radial displacement control, such as a servo electric cylinder, hydraulic cylinder, or pneumatic cylinder. In this embodiment, a pneumatic cylinder is preferred. In this embodiment, four circular components are specifically provided: a positive circular component 31, a rear circular component 32, a first-side circular component 33, and a second-side circular component 34, arranged sequentially along the circumference of the inner ring fixed mold 2. The rear circular component 32 and the positive circular component 31 are arranged opposite each other along the radial direction of the inner ring fixed mold 2, and the first-side circular component 33 and the second-side circular component 34 are arranged opposite each other along the radial direction of the inner ring fixed mold 2. The four circular components together form a circular operation space coaxial with the inner ring fixed mold 2. Through the four force application points evenly distributed in the circumference, a uniform force can be applied to the raw material during the step-by-step rolling process, avoiding the problem of cracking or uneven deformation of the raw material due to excessive force at a single point. At the same time, the step-by-step action of the four circular components can realize the gradual bending of the raw material without pre-bending the raw material into a closed ring, fundamentally eliminating the indispensable manual pre-bending process in the traditional process.

[0035] Reference Figure 5 , Figure 6 Cooperate Figure 1 A movable positioning pin 5 is provided above the annular forming cavity on the frame 1. The positioning pin 5 is equipped with a lifting displacement drive mechanism 501. The lifting displacement drive mechanism 501 can drive the positioning pin 5 to move vertically and simultaneously drive the positioning pin 5 to move horizontally and reset. The positioning pin 5 is configured to extend downward into the annular forming cavity during the step-by-step rolling of each round part, and press the joint end of the outer ring material of the steamer into the outer wall of the inner ring fixing mold 2 through horizontal feeding to form a temporary anti-springback limit. After the joint end of the material is pressed and locked by the round part, it moves upward and exits the annular forming cavity. Bamboo raw materials generate significant springback stress during bending and rolling, especially in the early stages of step-by-step rolling. The ends not pressed tightly by the rounding piece are prone to displacement due to springback, leading to misalignment, insufficient overlap, or excessive overlap when the two ends are joined later. This directly affects the roundness and structural strength of the finished product. The positioning pin 5 can temporarily press and limit the ends of the raw material at key nodes of step-by-step rolling, completely offsetting the springback stress of the raw material. This ensures that the ends of the raw material always maintain the preset position during the rolling process, providing a reliable positioning basis for the precise joining of the two ends later. This completely solves the problems of poor joining accuracy and low finished product qualification rate caused by springback in traditional processes.

[0036] The positioning pin 5 has at least one micro-discharge port 51 at its pressing end facing the inner ring fixing mold 2. The position of the micro-discharge port 51 corresponds to the joint position of the raw material joint end of the outer ring of the steamer when the positioning pin 5 is pressing. The positioning pin 5 is provided with a glue supply channel connected to the micro-discharge port 51. The other end of the glue supply channel is connected to an external quantitative glue supply mechanism through a pipeline. While the positioning pin 5 presses the raw material joint end against the outer wall of the inner ring fixing mold 2, the quantitative glue supply mechanism can accurately and quantitatively inject adhesive into the joint of the raw material joint end through the glue supply channel and the micro-discharge port 51. While temporarily preventing rebound and limiting the position, the pre-bonding and fixing of the joint is completed, so that the two joint ends of the raw material form a stable bonded structure before the alignment pin 5 withdraws. This completely avoids the problem of misalignment and edge misalignment of the joint ends due to stress when the alignment and rounding part 31 is fed and pressed in the later stage. This further improves the bonding accuracy and structural strength of the joint. At the same time, the precise alignment and quantitative glue supply of the micro glue outlet 51 ensures that the glue is only filled at the joint and there will be no glue overflow that contaminates the surface of the raw material. This ensures the appearance quality of the finished product and eliminates the need for additional cleaning procedures, thus simplifying the production process.

[0037] Reference Figure 3 and Figure 4 A lifting ring 6 for ejecting finished products is provided on the frame 1 below the annular forming cavity. The lifting ring 6 is coaxially sleeved on the outside of the inner ring fixing mold 2. The inner diameter of the lifting ring 6 is greater than the outer diameter of the inner ring fixing mold 2 and less than or equal to the outer diameter of the annular forming cavity in the forming state. A lifting drive mechanism is connected to the bottom of the lifting ring 6. The lifting drive mechanism is fixedly installed at the bottom of the frame 1 and is used to drive the lifting ring 6 to move up and down along the axial direction of the inner ring fixing mold 2. After heating and shaping, the outer ring of the steamer is tightly fitted onto the outer wall of the inner ring fixing mold 2. In traditional processes, manual prying or knocking is required to remove the finished product, which can easily lead to damage to the roundness of the finished product, surface scratches, or even cracking and scrapping. However, the lifting ring 6 in this embodiment can apply a force evenly to the bottom of the outer ring of the finished steamer through an axial upward lifting action after the whole round part is reset, and smoothly lift it from the inner ring fixing mold 2, achieving demolding without damage. This not only ensures the structural integrity and appearance quality of the finished product, but also automates the demolding process, further improving the overall production efficiency. At the same time, the size design of the lifting ring 6 can ensure that it will not interfere with the inner ring fixing mold 2 during the lifting process, and can also fully support the entire bottom end face of the finished product, avoiding tilting or deformation of the finished product during the lifting process.

[0038] The frame 1 is also equipped with a positioning block 7 for positioning the end of the raw material on the outer ring of the steamer. The positioning block 7 is fixedly set on the side of the frame 1 corresponding to the first side round part 33, and is located between the positive round part 31 and the first side round part 33. The positioning block 7 can provide a precise initial positioning reference for the raw material during the feeding process. The operator only needs to place one end of the raw material steadily against the positioning end face of the positioning block 7 to complete the initial positioning of the raw material. There is no need for repeated manual adjustment of the position, which reduces the difficulty of the feeding operation and ensures that the initial position of each raw material is completely consistent. This provides a unified reference for subsequent step-by-step rolling and precise end docking, avoiding finished product size errors caused by initial positioning deviations from the source, and further improving the standardization of the product.

[0039] Furthermore, the upper ends of the first side rounding component 33 and the second side rounding component 34 are provided with longitudinal anti-bounce parts. The longitudinal anti-bounce parts cover at least part of the area above the forming cavity. During the step-by-step rolling process, when the rounding component drives the raw material to bend inward, the unclamped part of the raw material will have an upward bounce tendency due to the release of bending stress. In particular, bamboo raw material itself has a high elastic modulus. If the bounce amplitude is too large, it will cause the raw material to fall out of the annular forming cavity, causing the rolling to be interrupted or even the raw material to be scrapped. The longitudinal anti-bounce parts can form an axial limit on the raw material from above, constrain the vertical displacement of the raw material, and ensure that the raw material is always within the preset space of the annular forming cavity during the entire rolling process, and will not bounce out upward. This greatly improves the stability of the equipment operation and the yield. At the same time, the longitudinal anti-bounce parts only cover part of the area above the forming cavity and will not interfere with the downward and horizontal feed actions of the positioning needle 5, ensuring the normal realization of the function of the positioning needle 5.

[0040] The heating and shaping assembly in this embodiment includes an inner heating unit and an outer heating unit. The inner ring fixing mold 2, the positive rounding part 31, the rear rounding part 32, the first side rounding part 33, and the second side rounding part 34 are all integral structures made of metal with excellent thermal conductivity, possessing excellent thermal uniformity and structural stability. The inner ring fixing mold 2 has several vertically opened inner ring receiving holes 201 evenly distributed circumferentially inside. The inner heating unit includes several inner heating rods (not shown in the figure) matching the number of inner ring receiving holes 201, and the inner heating rods are sealed and inserted into the inner ring receiving holes 201 one by one. The positive rounding part 31, the rear rounding part 32, the first side rounding part 33, and the second side rounding part 34 all have several vertically opened rounding part receiving holes 302 evenly distributed along the length of the rounding part inside. The unit includes several external heating rods (not shown in the figure) corresponding to each round part. The external heating rods are sealed and inserted into the round part receiving holes 302 of the corresponding round parts. The internal heating rods and each external heating rod are electrically connected to a temperature control unit. This built-in heating structure, through the design of inserting the heating rods into the metal substrate, enables heat to be evenly conducted through the integrated metal substrate to the outer wall surface of the entire inner ring fixing mold 2 and the clamping working surface of each round part, so as to achieve uniform heating of the entire clamping and shaping surface.

[0041] This embodiment also discloses a method for rolling the outer ring of a steamer. This method is implemented using the aforementioned steamer outer ring rolling machine and specifically includes the following steps (see flowchart). Figure 9 ):

[0042] S1 Raw Material Pretreatment: The raw material to be processed, consisting of an inner ring plate a and two outer ring plates b, is prepared. The specific steps are as follows: First, according to the design dimensions of the outer ring of the steamer to be produced, two outer ring plates b and one inner ring plate a of the same size are cut out. The width of the outer ring plate b is less than half the width of the inner ring plate a, and the length of the outer ring plate b is greater than the length of the inner ring plate a. This ensures that the two outer ring plates b can form a complete closed-loop structure when joined together, while the inner ring plate a provides a stable load-bearing foundation for the outer ring plate b. Then, the surfaces of the inner ring plate a and outer ring plate b are treated to remove the hard, dense green outer layer of the bamboo, improving the softening effect of the bamboo and the adhesion performance of the adhesive. Finally, a beveled joint surface b1 is cut at one end of each of the two outer ring plates b (refer to...). Figure 7 Finally, after evenly applying adhesive to the mating surfaces of the inner ring plate a and the outer ring plate b, the two outer ring plates b are symmetrically attached and fixed to the same side of the inner ring plate a along the width direction to obtain the raw material to be processed. Through the design of the composite structure raw material, the circumferential structural strength of the outer ring of the finished steamer can be greatly improved, the constraint effect on the steamer body can be enhanced, and the service life of the steamer can be extended.

[0043] S2 Loading and Positioning: The raw material to be processed is slightly bent into a U-shape and placed between the inner ring fixing mold 2 and the outer ring full circle assembly. The inner ring plate a is set to fit against the outer wall of the inner ring fixing mold 2. One end of the raw material is stably abutted against the positioning block 7 to complete the initial positioning of the raw material. The entire loading process only requires a simple U-shaped pre-bending. There is no need to manually bend the raw material into a closed ring, which greatly reduces the requirements for manual operation. Even inexperienced operators can quickly complete the loading operation.

[0044] S3 Step-by-Step Rolling of the Complete Circular Shape: Each complete circular shape is driven to move inward sequentially according to a preset order, causing the raw material to bend and deform in stages. During this process, the positioning pin 5 presses and limits the mating ends of the raw material to prevent springback. After the two ends of the raw material are mated and locked by the complete circular shape, the positioning pin 5 retracts and resets. Finally, all the complete circular shape parts together press the raw material against the outer wall of the inner ring fixing mold 2, forming a complete outer ring of the steamer. The specific implementation process of this step is as follows:

[0045] The push mechanism 4 corresponding to the rear round part 32 drives the rear round part 32 to move inward, clamp the corresponding part of the raw material, and fix the middle part of the raw material stably between the inner ring fixing mold 2 and the rear round part 32, forming a fixed reference for the entire rolling process, and avoiding the overall displacement of the raw material during the subsequent step-by-step rolling process.

[0046] S3.2 The propulsion mechanism 4 corresponding to the first side round part 33 drives the first side round part 33 to move inward to the end of the stroke, causing the corresponding part of the raw material to bend and deform inward, so that the first end of the raw material moves to the preset docking position with the bending action.

[0047] S3.3 The lifting displacement drive mechanism 501 drives the alignment pin 5 to move downward to the corresponding position of the end of the raw material, and then drives the alignment pin 5 to feed horizontally in the direction close to the rear round part 32, pressing the first end of the raw material tightly against the outer wall of the inner ring fixed mold 2, forming a temporary anti-springback limit, completely offsetting the springback stress of the raw material, and ensuring the stability of the end position of the raw material.

[0048] S3.4 The propulsion mechanism 4 corresponding to the second side round part 34 drives the second side round part 34 to move inward to the end of the stroke, causing the corresponding part of the raw material to bend inward, so that the second end of the raw material moves to the docking position with the bending action and abuts against the first end end that was originally abutting against the positioning block 7.

[0049] The propulsion mechanism 4 corresponding to the S3.5 positioning rounding part 31 drives the positioning rounding part 31 to move inward to the predetermined position, abut against the second end of the raw material and drive it to bend inward, so that the second end of the raw material continues to bend and drives the first end of the raw material to be compacted. At this time, the area has been stably pressed by the positioning rounding part 31 (the first end of the raw material does not have the conditions for reset). Then, the lifting displacement drive mechanism 501 drives the positioning pin 5 to exit the annular forming cavity upward and reset, making room for the final feed of the positioning rounding part 31.

[0050] The propulsion mechanism 4 corresponding to the S3.6 centering rounding component 31 drives the centering rounding component 31 to continue moving inward to the end of its stroke, so that the centering rounding component 31, the rear rounding component 32, the first side rounding component 33, and the second side rounding component 34 are on the same circumference, together pressing the raw material evenly against the outer wall of the inner ring fixing mold 2, forming a steamer outer ring with precise roundness and complete structure. Through the step-by-step rolling process, the gradual bending and forming of the raw material is realized, eliminating the need for pre-bending into a closed ring by hand. This fundamentally solves the industry bottleneck of traditional processes relying on manual pre-bending. At the same time, each rolling action is precisely controlled by the equipment, ensuring that the forming accuracy of each finished product is completely consistent, greatly improving the standardization of the product.

[0051] S4 Heating and Shaping: The heating and shaping component is activated, and the temperature control unit controls the inner and outer heating modules to rise to the preset temperature. The outer ring of the steamer in the clamped state is heated synchronously, and the pressure is maintained at the preset temperature for the preset time to fully soften the bamboo fibers and release the internal stress. At the same time, a uniform carbonized protective layer is formed on the inner and outer surfaces, realizing the simultaneous completion of shaping and anti-mildew treatment. This ensures that the finished product will not rebound or deform during subsequent use, and has a longer service life and better anti-mildew and anti-insect performance.

[0052] S5 Demolding and Part Removal: After heating and shaping, the heating and shaping components stop heating, and each propulsion mechanism 4 drives the corresponding round part to move outward and reset, releasing the radial clamping on the outer ring of the steamer. Then, the lifting drive mechanism drives the lifting ring 6 to move upward, smoothly lifting the shaped outer ring of the steamer, so that it is completely separated from the inner ring fixing mold 2. The operator can then remove the part. The entire demolding process does not require manual prying or knocking, achieving non-destructive demolding and ensuring the quality of the finished product.

[0053] The outer ring of the steamer to be produced in this embodiment is referenced. Figure 8 Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0054] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A steamer outer ring rolling machine, comprising a frame (1), wherein an inner ring fixing mold (2) and an outer ring rounding assembly coaxially cooperate with the inner ring fixing mold (2) are provided on the frame (1), and a heating and shaping assembly is provided on the inner ring fixing mold (2) and / or the outer ring rounding assembly, characterized in that: The outer ring circular assembly is a variable diameter device. After the outer ring circular assembly retracts inward to the end of its stroke, it forms an annular forming cavity with the outer wall of the inner ring fixing mold (2) to accommodate the outer ring material of the steamer. The outer ring circular assembly includes at least three circular parts arranged circumferentially along the inner ring fixing mold (2). Each circular part is connected to an independent propulsion mechanism (4). The propulsion mechanism (4) is used to drive the corresponding circular part to move independently radially along the inner ring fixing mold (2) to adjust the relationship between the corresponding circular part and the inner ring fixing mold (2). The clamping gap between the ring fixing mold (2) enables the step-by-step rolling of the outer ring material of the steamer; a movable positioning pin (5) is provided on the frame (1) above the annular forming cavity. The positioning pin (5) is configured to extend downward into the annular forming cavity during the step-by-step rolling of each round piece, and press the joint end of the outer ring material of the steamer against the outer wall of the inner ring fixing mold (2) by horizontal feeding to form a temporary anti-rebound limit. After the joint end of the material is pressed and locked by the round piece, it moves upward and exits the annular forming cavity.

2. The steamer outer ring rolling machine according to claim 1, characterized in that, The circular component is provided in four parts, namely, the positive circular component (31), the rear circular component (32), the first side circular component (33), and the second side circular component (34) arranged sequentially along the circumference of the inner ring fixing mold (2). The rear circular component (32) is arranged opposite to the positive circular component (31), and the first side circular component (33) is arranged opposite to the second side circular component (34).

3. The steamer outer ring rolling machine according to claim 2, characterized in that, A lifting ring (6) for ejecting the finished product is provided on the frame (1) below the annular forming cavity. The lifting ring (6) is coaxially sleeved on the outside of the inner ring fixing mold (2). The inner diameter of the lifting ring (6) is greater than the outer diameter of the inner ring fixing mold (2) and less than or equal to the outer diameter of the annular forming cavity in the forming state. A lifting drive mechanism is connected to the bottom of the lifting ring (6). The lifting drive mechanism is used to drive the lifting ring (6) to move up and down along the axial direction of the inner ring fixing mold (2).

4. A steamer outer ring rolling machine according to claim 3, characterized in that, The frame (1) is also provided with a positioning block (7) for positioning the end of the outer ring material of the steamer; the positioning block (7) is fixedly set on the side of the frame (1) corresponding to the first side round piece (33), and is located between the positive round piece (31) and the first side round piece (33).

5. A steamer outer ring rolling machine according to claim 4, characterized in that, At least the upper ends of the first side round part (33) and the second side round part (34) are provided with longitudinal anti-bounce parts, and the longitudinal anti-bounce parts at least cover part of the area above the molding cavity.

6. A steamer outer ring rolling machine according to claim 4, characterized in that, The positioning pin (5) has at least one micro-exposure port (51) on the pressing end facing the inner ring fixing mold (2). The opening position of the micro-exposure port (51) corresponds to the joint position of the outer ring material of the steamer when the positioning pin (5) is pressed.

7. The steamer outer ring rolling machine according to claim 4, characterized in that, The heating and shaping assembly includes an inner heating rod and an outer heating rod; the inner ring fixing mold (2) and each round part are all high thermal conductivity metal integrated structures, and each has a vertically opened receiving hole inside. The inner heating rod and the outer heating rod are inserted into the receiving holes of the inner ring fixing mold (2) and each round part respectively.

8. A method for rolling the outer ring of a steamer, characterized in that, The method of using the steamer outer ring rolling machine according to any one of claims 3-7 includes the following steps: S1 Raw material pretreatment: Prepare raw materials to be processed by bonding an inner ring plate (a) with two outer ring plates (b); S2 Loading and Positioning: The raw material to be processed is bent in a U-shape and placed between the inner ring fixing mold (2) and the outer ring round assembly, so that the inner ring plate (a) is attached to the outer wall of the inner ring fixing mold (2), and one end of the raw material is placed against the positioning block (7) to complete the positioning; S3 Step-by-step rolling of the whole circle: Drive each whole circle part to move inward in sequence according to the preset order, causing the raw material to bend and deform step by step. During the process, the positioning pin (5) presses and limits the joint end of the raw material to prevent springback. After the two ends of the raw material are joined and pressed and locked by the whole circle part, the positioning pin (5) exits and resets. Finally, each whole circle part presses the raw material against the outer wall of the inner ring fixing mold (2) to form a complete outer ring of the steamer. S4 Heating and Shaping: Activate the heating and shaping component to heat the outer ring of the steamer in the clamped state, and maintain the pressure and shape at the preset temperature for the preset time; S5 Demolding and Part Removal: After heating and shaping, each propulsion mechanism (4) drives the corresponding round part to move outward and reset. The lifting ring (6) moves upward to lift the outer ring of the shaped steamer, and after it is removed from the inner ring fixing mold (2), the part is removed.

9. The method for rolling the outer ring of a steamer according to claim 8, characterized in that, The specific steps of the raw material pretreatment in step S1 are as follows: cut out two outer ring plates (b) and one inner ring plate (a) of the same size. The width of the outer ring plate (b) is less than half the width of the inner ring plate (a), and the length of the outer ring plate (b) is greater than the length of the inner ring plate (a). Remove the outer skin from the surfaces of the inner ring plate (a) and the outer ring plate (b). Cut a butt joint bevel (b1) at one end of the two outer ring plates (b). After applying glue to the mating surfaces of the inner ring plate (a) and the outer ring plate (b), attach and fix the two outer ring plates (b) to the same side of the inner ring plate (a) along the width direction to obtain the raw material to be processed.

10. The method for rolling the outer ring of a steamer according to claim 8, characterized in that, The specific steps for step S3, which involves rolling the entire circle, are as follows: The push mechanism (4) corresponding to the rear round part (32) drives the rear round part (32) to move inward and clamp the corresponding part of the raw material; S3.2 The propulsion mechanism (4) corresponding to the first side round part (33) drives the first side round part (33) to move inward to the end of the stroke, causing the corresponding part of the raw material to bend and deform inward; S3.3 The lifting displacement drive mechanism (501) drives the alignment pin (5) to move downward to the corresponding position of the end of the raw material, and then drives the alignment pin (5) to move towards the rear round part (32) to press the end of the raw material tightly against the outer wall of the inner ring fixing mold (2). S3.4 The propulsion mechanism (4) corresponding to the second side round part (34) drives the second side round part (34) to move inward to the end of the stroke, causing the corresponding part of the raw material to bend inward, so that the second end of the raw material abuts against the first end that was originally against the positioning block (7); The push mechanism (4) corresponding to the S3.5 positioning round part (31) drives the positioning round part (31) to move inward to the predetermined position, abut against the second end of the raw material and drive it to bend inward, so that the second end of the raw material continues to bend and drives the first end of the raw material to be compacted; then the lifting displacement drive mechanism (501) drives the positioning needle (5) to exit upward and reset. The propulsion mechanism (4) corresponding to the S3.6 positioning round part (31) drives the positioning round part (31) to continue moving inward to the end of the stroke, so that each round part together presses the raw material against the outer wall of the inner ring fixing mold (2) to form a complete outer ring of the steamer.

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