Forming method and special forming device for limiting part of round pipe of retractable door

Abstract

The invention discloses a punch forming machining method and device for a round pipe limiting part of a stainless steel retractable door, and relates to the technical field of metal machining. The device comprises a rack, a feeding mechanism, a positioning mechanism, a mold core driving mechanism and a punching mechanism; according to the machining method, a round pipe is conveyed to a machining position through the feeding mechanism and is precisely fixed through the positioning mechanism, the mold core driving mechanism drives the mold core rod to penetrate into the round pipe to form rigid support, the stamping mechanism drives the stamping base to press downwards, and the limiting groove of the preset specification is integrally formed in the outer wall of the round pipe in cooperation with the inner support of the mold core rod. By means of the cooperative forming effect of the die core and stamping, collapse and distortion during stamping of the round pipe are effectively avoided, the size precision of the limiting groove and the straightness of the round pipe both meet the design requirements, the machining efficiency is improved compared with laser machining, the machining cost is reduced, and large-scale production of the stainless steel round pipe can be adapted; and the assembly and use requirements of the retractable door circular pipe limiting part are comprehensively met.

Description

Technical Field

[0001] This invention relates to the field of metal processing technology, and more specifically to a method and a special forming device for forming the limiting part of a telescopic gate tube. Background Technology

[0002] The core components of a stainless steel telescopic gate include a central shaft, connecting rods, and scissor tubes. The scissor tubes require limiting parts (limiting grooves) to engage with the hinge joints of the central shaft and connecting rods, restricting relative movement between components and ensuring stable gate operation. For example, patent application CN119466529A discloses a quick-install telescopic gate shaft connection structure, including a limiting member detachably inserted at the hinge joint between the central shaft and connecting rod. The central shaft, at its hinge joint with the connecting rod, has a limiting part for limiting and fixing the limiting member. At least a portion of the limiting member can enter the limiting part and be locked in place, allowing the limiting assembly to be detachably and fixedly installed on the central shaft, located on both sides of the hinge joint between the central shaft and connecting rod, thereby restricting relative movement between the connecting rod and the central shaft. This patented structure effectively fixes the connection between the connecting rod and the central shaft using the limiting assembly, while simplifying the assembly process.

[0003] In existing technologies, the main processing method for stainless steel round tube limiting parts is laser cutting. This method has the following drawbacks: 1) Laser cutting results in the loss of a portion of the telescopic tube material, affecting the overall structural strength of the tube. Furthermore, laser processing easily generates slag and a heat-affected zone, which not only affects structural strength but also the fitting accuracy with the limiting parts, sometimes requiring secondary grinding and increasing the processing steps. 2) Laser processing is relatively expensive, requiring large equipment investment and high energy consumption, resulting in high unit processing costs for the limiting parts, which is not conducive to mass production. 3) Laser processing speed is relatively slow; for long round tubes requiring multiple limiting grooves, the processing efficiency is insufficient to meet the needs of large-scale production.

[0004] Therefore, there is an urgent need for a low-cost, high-efficiency, and high-precision processing technology for the circular tube limiting part of telescopic gates to solve the problems existing in the current technology. Summary of the Invention

[0005] The purpose of this invention is to provide a low-cost, high-efficiency method and a dedicated forming device for forming the limiting part of a telescopic gate tube with minimal strength loss, thereby providing at least a beneficial option or creating conditions to solve one or more technical problems existing in the prior art.

[0006] The present invention achieves the above-mentioned objective by adopting the following technical solution: a method for forming a limiting part of a telescopic gate tube, comprising the following steps: 1) inserting a grooved mold core into the telescopic gate tube, the groove being used to match and form the limiting part of the telescopic gate tube; 2) stamping the telescopic gate tube using a stamping device, thereby forming a limiting groove corresponding to the groove on the outer surface of the telescopic gate tube; 3) rotating the mold core to release the limiting between the groove and the limiting groove caused by the stamping; 4) removing the mold core to prepare for inserting the next telescopic gate tube.

[0007] This invention provides a method for forming the limiting part of a telescopic gate tube. The limiting part adopts a mold core + stamping forming method. After forming, the overall profile of the telescopic gate tube is not lost, thus preserving the strength of the telescopic gate tube to the maximum extent. After stamping, the mold core can be smoothly extracted by rotating the mold core. The processing efficiency is high and the application cost is relatively low.

[0008] The mold core consists of two parts, which are inserted into and pulled out from both ends of the telescopic gate tube, respectively. This effectively reduces the problem of the mold core being unable to be pulled out from the telescopic gate tube due to deformation.

[0009] The groove is formed on one opposite side of the mold core, and the side containing the groove is an arc surface that fits against the inner wall of the telescopic gate tube. The adjacent side of the side containing the groove is a plane. Rotating the mold core by 90° aligns the plane with the limiting groove, thus releasing the restriction between the groove and the limiting groove. The combination of the arc surface and the plane design facilitates the stamping of the limiting groove and ensures the smooth extraction of the mold core.

[0010] In some embodiments, the method for forming the limiting portion includes the following steps:

[0011] Step 1, feeding and positioning: The feeding mechanism transports the pre-treated round tube to the processing position. The positioning mechanism is activated, radially clamps the round tube and performs axial positioning to ensure that the processing datum of the round tube coincides with the central axis of the mold core rod and the punch head.

[0012] Step 2, mold core support: The mold core translation drive assembly drives the mold core rod to penetrate into the interior of the round tube along the axial direction, so that the forming surface of the mold core head accurately corresponds to the preset limit groove processing position, and the mold core rod forms rigid support for the inner wall of the round tube.

[0013] Step 3, stamping: The stamping drive drives the stamping seat to descend, and the stamping head at the lower end of the stamping seat acts on the corresponding position on the outer wall of the round tube. Under the combined action of the internal support of the die core rod and the external pressure of the stamping head, the corresponding area of ​​the round tube undergoes plastic deformation to form a limiting groove that meets the size requirements.

[0014] Step 4: Reset and eject the material. The mold core rotation drive assembly drives the mold core rod to rotate at a preset angle, the mold core translation drive assembly drives the mold core rod to eject the round tube, the positioning mechanism releases the round tube, and the feeding mechanism moves the processed round tube out of the processing area, completing a single processing cycle.

[0015] This invention also provides a special forming device for the limiting part of a telescopic gate tube, which includes a frame, a feeding mechanism, a positioning mechanism, a mold core driving mechanism, and a stamping mechanism.

[0016] The feeding mechanism is mounted on the frame and is used to transport stainless steel round tubes to the preset processing position, and can also remove the processed round tubes out of the processing area;

[0017] The positioning mechanism, located at the processing position, is used for axial positioning and radial clamping and fixing of the round tube;

[0018] The core drive mechanism includes a core translation drive assembly, a core rotation drive assembly, and a core rod. The core rotation drive assembly is mounted on the core translation drive assembly, and the core rod is fixed on the core rotation drive assembly. The outer diameter of the core rod is adapted to the inner diameter of the stainless steel round tube. The core rod has an arc-shaped side surface and a flat surface. The arc-shaped side surface has several forming grooves along its axial direction that are adapted to the shape of the limiting groove of the round tube. The core rod can move along the axial direction of the round tube to extend into or retract from the round tube.

[0019] The stamping mechanism, located above the feeding mechanism, includes a stamping drive and a stamping base. The lower end of the stamping base is provided with a stamping head corresponding to the contour of the limiting groove. The stamping drive can drive the stamping base to move up and down in the vertical direction to stamp and form the outer wall of the round tube.

[0020] As a further explanation of the above solution, the positioning mechanism includes a positioning bracket and a clamping assembly. The positioning bracket is provided with an arc-shaped groove corresponding to the round tube, so that the round tube can be stably supported and positioned in the arc-shaped groove. The clamping assembly includes a positioning cylinder, an upper clamping block and a lower clamping block arranged symmetrically. The upper clamping block and the lower clamping block are respectively provided with arc-shaped positioning surfaces adapted to the outer wall of the round tube, which can achieve precise clamping and positioning of the round tube. The upper arc-shaped groove and the lower arc-shaped groove are provided with a polyurethane anti-slip and wear-resistant layer to avoid damage to the surface of the round tube during clamping.

[0021] Furthermore, the mold core translation drive assembly includes a fixed base with a linear guide rail, a translation drive cylinder assembly, and a sliding seat. The translation drive cylinder assembly is fixed to the fixed base, and the sliding seat is movably mounted on the linear guide rail. The piston rod of the translation drive cylinder assembly is connected to the sliding seat, which can drive the sliding seat to move back and forth along the linear guide rail.

[0022] Furthermore, the core rotation drive assembly is mounted on the sliding seat. The core rotation drive assembly includes a core rotation drive cylinder and a rocker arm. The core rod is connected to the rocker arm. The core rotation drive cylinder drives the rocker arm to swing, thereby causing the core rod to rotate around its center line at a certain angle, so that the core rod can exit the round tube that has just been stamped out of the limiting part.

[0023] Furthermore, the outer diameter of the mold core rod is fitted with the inner diameter of the round tube with a clearance (0.05-0.1mm) to ensure that it can be smoothly inserted into the round tube and provide reliable support. The forming surface of the mold core rod is an arc-shaped concave surface, and its contour is consistent with the design shape of the limiting groove. The material is hard alloy, which has high strength and wear resistance, and extends service life.

[0024] Furthermore, the stamping drive component is a hydraulic or pneumatic cylinder, and the output pressure can be adjusted within the range of 5-20MPa to adapt to the processing requirements of round tubes with different wall thicknesses; the stamping head is fixedly connected to the piston rod of the stamping drive component, and the stamping head is detachably installed on the lower end of the stamping plate by bolts. The stamping surface contour of the stamping head matches the limiting groove. The material is high-strength alloy steel, and the hardness is ≥HRC55 after quenching treatment to ensure the stability and precision of stamping.

[0025] Furthermore, the feeding mechanism includes a feeding drive cylinder mounted on the frame, a guide rail, and a feeding seat movably mounted on the guide rail. The feeding seat is equipped with a lifting cylinder, and the piston rod of the lifting cylinder is connected to a lifting bracket for supporting and lifting the round tube.

[0026] The specialized forming equipment provided by this invention mainly consists of a feeding mechanism, a positioning mechanism, a mold core driving mechanism, and a stamping mechanism, forming a stamping structure for the stainless steel telescopic gate's circular tube limiting part. It employs a method of coordinated forming through internal mold core support and external stamping, avoiding the problems of circular tube collapse and twisting caused by traditional unsupported stamping. The straightness tolerance of the processed circular tube is ≤0.5mm, and the dimensional accuracy of the limiting groove conforms to GB / T1804-M. Standardized processing requires no subsequent correction or grinding, resulting in significantly superior processing quality compared to laser processing. Stamping efficiency is over 30% higher than laser processing, enabling continuous batch processing and greatly improving production efficiency. Furthermore, the investment cost and energy consumption of stamping equipment are far lower than laser processing equipment, reducing processing costs by 40% and demonstrating significant economic benefits. The die head and stamping head are replaceable, allowing for the processing of stainless steel round tubes of different lengths and inner diameters, as well as limiting grooves of different sizes and shapes, offering strong versatility and reducing equipment investment costs. The processing process eliminates the heat-affected zone, leaving the round tube surface free of slag and oxide layers. The edges of the limiting grooves are smooth, ensuring high precision in fitting with the limiting components, eliminating the need for secondary processing and simplifying the processing flow. Simultaneously, the stamped limiting groove structure is stable and strong, meeting the hinged limiting requirements of the telescopic gate's central axis and connecting rod, extending the telescopic gate's service life. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the structure of the present invention.

[0029] Figure 3 This is a schematic diagram of the feeding mechanism of the present invention.

[0030] Figure 4 This is a schematic diagram of the stamping mechanism of the present invention.

[0031] Figure 5 This is a schematic diagram of the positioning mechanism of the present invention.

[0032] Figure 6 This is a schematic diagram of the mold core rod structure of the present invention.

[0033] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Feeding mechanism; 2-1. Feeding drive cylinder; 2-2. Guide rail; 2-3. Feeding seat; 2-4. Lifting cylinder; 2-5. Lifting bracket; 3. Positioning mechanism; 3-1. Positioning bracket; 3-11. Arc groove; 3-2. Fixture assembly; 3-21. Positioning cylinder; 3-22. Upper clamping block; 3-23. Lower clamping block; 4. Mold core driving mechanism; 4-1. Mold core translation drive assembly; 4-11. Fixed base; 4-12. Linear guide rail; 4-13. Translation drive cylinder assembly; 4-14. Sliding seat; 4-2. Mold core rotation drive assembly; 4-21. Mold core rotation drive cylinder; 4-22. Swing rod; 4-31. Mold core rod; 4-32. Arc side; 4-33. Flat surface; 4-33. Forming groove; 5. Stamping mechanism; 5-1. Stamping drive component; 5-2. Stamping seat; 5-3. Stamping head; 6. Round tube. Detailed Implementation

[0034] In the description of this invention, it should be noted that the directional terms such as "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this invention.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature, and in the description of this invention, "at least" means one or more, unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] In this invention, unless otherwise specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "below," and "over" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Above," "below," and "below" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings, making the technical solution and beneficial effects of the present invention clearer and more explicit. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0039] A method for forming a limiting part of a telescopic gate tube includes the following steps: 1) inserting a grooved mold core into the telescopic gate tube, the groove being used to match and form the limiting part of the telescopic gate tube; 2) stamping the telescopic gate tube using a stamping device, thereby forming a limiting groove corresponding to the groove on the outer surface of the telescopic gate tube; 3) rotating the mold core to release the limiting between the groove and the limiting groove caused by the stamping; 4) removing the mold core to prepare for inserting the next telescopic gate tube.

[0040] The mold core consists of two parts, which are inserted into and pulled out from both ends of the telescopic gate tube, respectively. This effectively reduces the problem of the mold core being unable to be pulled out from the telescopic gate tube due to deformation.

[0041] Since the inner wall of the telescopic gate tube will enter the groove after stamping, the rotation angle of the mold core is preferably 90° when rotating the mold core to release the limiting groove. The groove is formed on one opposite side of the mold core, and the side where the groove is located is an arc surface that fits against the inner wall of the telescopic gate tube; the adjacent side of the side where the groove is located is a plane. By rotating the mold core to align the plane with the limiting groove, the limiting groove between the groove and the limiting groove is released. The combination of arc surface and plane design not only facilitates the stamping of the limiting groove but also ensures the smooth extraction of the mold core.

[0042] Reference Figures 1-6 As shown, a special forming device for the limiting part of the telescopic gate tube used to implement the above method includes a frame 1, a feeding mechanism 2, a positioning mechanism 3, a mold core driving mechanism 4, and a stamping mechanism 5. The frame 1 serves as the installation reference and support carrier for the entire device, providing a stable installation platform for the feeding mechanism 2, the positioning mechanism 3, the mold core driving mechanism 4, and the stamping mechanism 5, ensuring the coaxiality and positioning accuracy of each mechanism during operation, and guaranteeing the stability of the processing process.

[0043] The feeding mechanism 2 is fixedly installed on the frame of machine 1 and mainly consists of a feeding drive cylinder 2-1, a guide rail 2-2, a feeding seat 2-3, a lifting cylinder 2-4, and a lifting bracket 2-5. The feeding seat 2-3 is movably mounted on the guide rail 2-2, and the feeding drive cylinder 2-1 can drive the feeding seat 2-3 to perform reciprocating translational movement along the guide rail 2-2. The lifting cylinder 2-4 is vertically installed on the feeding seat, and its piston rod is fixedly connected to the lifting bracket. The lifting bracket provides stable support and lifting for the round tube, completing the automatic feeding and unloading of the round tube. The feeding mechanism has a built-in position sensor that can detect the axial position of the round tube in real time, ensuring accurate alignment between the die core rod and the punch head, and effectively ensuring the consistency of the processing position of multiple round tubes. It is worth noting that the feeding drive cylinder can also be replaced by a motor drive.

[0044] The positioning mechanism 3 is precisely positioned at the processing location and includes a positioning bracket 3-1 and a clamping assembly 3-2. The top of the positioning bracket 3-1 has an arc-shaped groove 3-11 that matches the outer diameter of the round tube 6 for initial support and positioning of the round tube. The clamping assembly 3-2 consists of a positioning cylinder 3-21, an upper clamping block 3-22, and a lower clamping block 3-23 arranged symmetrically. The opposing end faces of the upper clamping block 3-22 and the lower clamping block 3-23 are provided with arc-shaped positioning surfaces that fit against the outer wall of the round tube. The positioning cylinder 3-21 drives the upper clamping block 3-22 and the lower clamping block 3-23 to move towards each other, thereby achieving precise clamping and positioning of the round tube 6. The surface of the arc-shaped positioning surface is covered with a polyurethane anti-slip and wear-resistant layer, which can enhance the friction during clamping and avoid scratching the surface of the round tube, thus ensuring the appearance quality of the product.

[0045] The mold core drive mechanism 4 is the core mechanism for achieving precise molding, including the mold core translation drive assembly 4-1, the mold core rotation drive assembly 4-2, and the mold core rod 4-3, with the specific structure as follows:

[0046] The mold core translation drive assembly 4-1 consists of a fixed base 4-11, a linear guide rail 4-12, a translation drive cylinder assembly 4-13, and a sliding seat 4-14. The fixed base 4-11 is fixedly installed on the frame 1. The linear guide rail 4-12 is laid parallel to the fixed base 4-11. The translation drive cylinder assembly 4-13 is horizontally fixed to one end of the fixed base. The sliding seat is movably assembled on the linear guide rail via a slider. The piston rod of the translation drive cylinder assembly is fixedly connected to the end of the sliding seat, which can drive the sliding seat to make high-precision reciprocating movements along the linear guide rail. The driving accuracy is ≤0.02mm, ensuring the positioning accuracy of the mold core rod.

[0047] The core rotation drive assembly 4-2 is mounted on the sliding seat 4-14 of the frame and consists of a core rotation drive cylinder 4-21 and a swing rod 4-22. The sliding seat 4-21 is equipped with a vertical plate. The upper end of the core rotation drive cylinder 4-21 is hinged to the vertical plate. The lower end of the core rod 4-3 is connected to the swing rod 4-22. The extension and retraction of the core rotation drive cylinder 4-21 drives the swing rod 4-22 to swing, thereby driving the core rod to rotate 30-60° around its own center line. This facilitates the core rod to smoothly exit the round tube after stamping and avoids interference with the limiting groove after forming.

[0048] Mold core rod 4-3: As the core molding component, it is fixedly connected to the output end of the mold core rotation drive assembly 4-2. Its outer diameter and the inner diameter of the round tube are fitted with a clearance (0.05-0.1mm), which ensures that the mold core rod can smoothly extend into the round tube and provides reliable rigid support for the inner wall of the round tube. The mold core rod 4-3 is provided with two arc-shaped side surfaces 4-31, and there is a plane 4-32 between the two arc-shaped side surfaces. Several molding grooves 4-33 that are adapted to the shape of the limiting groove of the round tube are provided along the axial direction of the arc-shaped side surfaces. The mold core rod is integrally molded with hard alloy material, which has excellent high strength and high wear resistance, effectively extending the service life and reducing replacement costs.

[0049] The stamping mechanism 5 is installed directly above the feeding mechanism 2 and consists of a stamping drive component 5-1 and a stamping base 5-2. The stamping drive component 5-1 is a hydraulic or pneumatic cylinder, and its output pressure can be steplessly adjusted within the range of 5-20MPa. It can be flexibly adjusted according to the wall thickness and material characteristics of the round tube to meet the processing requirements of round tubes of different specifications. The stamping base 5-2 is fixedly connected to the lower end of the piston rod of the stamping drive component 5-1. The stamping head 5-3 is detachably installed on the bottom surface of the stamping base 5-2 by bolts. The stamping surface contour of the stamping head is precisely consistent with the design shape of the limiting groove. The material is high-strength alloy steel, and after quenching treatment, the hardness is ≥HRC55. It has sufficient impact toughness and wear resistance to ensure the stability and dimensional accuracy of stamping.

[0050] The following is a stamping forming method for the circular tube limiting part of a telescopic gate, using the aforementioned stamping forming device. The specific processing steps are as follows:

[0051] Step 1, pretreatment of round tubes: Select stainless steel round tubes of SUS201 material, and remove burrs and burrs from the tube opening edges according to the product technical requirements to ensure that the tube opening is smooth and without sharp edges, so as to avoid scratching the surface of the mold core rod during subsequent processing and affecting the forming accuracy.

[0052] Step 2, feeding and positioning: The lifting bracket of the feeding mechanism rises and lifts the pre-treated round tube, and the feeding drive cylinder drives the feeding seat to move along the guide rail, accurately conveying the round tube to the processing position; the positioning bracket of the positioning mechanism provides initial support for the round tube with its arc groove, and then the positioning cylinder is activated, driving the upper clamping block and the lower clamping block to move towards each other, radially clamping the round tube. At the same time, the axial positioning structure realizes the axial positioning of the round tube, ensuring that the processing datum of the round tube is completely coincident with the central axis of the mold core rod and the stamping head, thus ensuring forming accuracy.

[0053] Step 3, core support: The translation drive cylinder assembly of the core translation drive component is activated, driving the sliding seat to move along the linear guide rail towards the round tube, causing the core rod to slowly penetrate into the round tube along the axial direction until the target forming surface on the core rod is precisely aligned with the preset limiting groove processing position. At this time, the outer wall of the core rod is tightly fitted with the inner wall of the round tube, forming a reliable rigid support, providing a stable foundation for subsequent stamping and forming, and preventing the round tube from collapsing or deforming during the stamping process.

[0054] Step 4, stamping: Based on the wall thickness of the round tube (e.g., 1.8mm) and the mechanical properties of SUS201 material, the output pressure of the stamping drive is set to 10-15MPa, and the downward pressing speed of the stamping head is 5-10mm / s. The stamping drive is activated, driving the stamping seat to drive the stamping head to descend at a uniform speed. The stamping head acts on the target position on the outer wall of the round tube. Under the combined action of the internal rigid support of the die core rod and the external uniform pressure of the stamping head, the corresponding area of ​​the round tube undergoes plastic deformation, ultimately forming a limiting groove that meets the dimensional requirements. The tolerance range of the formed limiting groove meets the maximum R2mm, and the overall straightness tolerance of the round tube is ≤0.5mm, which fully meets the product design standards.

[0055] Step 5, Reset and Unloading: After stamping is completed, the stamping drive component drives the stamping seat to lift and reset the stamping head; the die core rotation drive component starts, driving the die core rod to rotate 30-60° around its center line, so that the forming surface of the die core rod is misaligned with the limiting groove; then the die core translation drive component drives the die core rod to exit the round tube axially; the upper and lower clamping blocks of the positioning mechanism are released, the lifting bracket of the feeding mechanism lifts the processed round tube, and the feeding drive cylinder drives the feeding seat to move along the guide rail, moving the round tube out of the processing area, while simultaneously conveying the next round tube to be processed to the processing position, entering the next processing cycle.

[0056] If multiple limiting grooves need to be processed on the same round tube, after a single stamping is completed, the feeding mechanism drives the round tube to move axially to the processing position of the next limiting groove. After repositioning, the mold core support and stamping process of steps three and four are repeated until all limiting grooves are processed. Then, the reset and unloading operation of step five is performed.

[0057] Compared with existing technologies, this technical solution adopts an integrated stamping structure mainly composed of a frame, feeding mechanism, positioning mechanism, die core driving mechanism, and stamping mechanism. Through an innovative design that combines rigid internal support of the die core with external stamping for coordinated forming, it offers the following significant advantages over existing technologies: 1. Superior forming quality: Effectively avoids the collapse and twisting problems of round tubes caused by traditional unsupported stamping. The dimensional accuracy of the limiting groove fully complies with GB / T1804-M standards, and the groove edges are smooth and burr-free, requiring no subsequent correction or grinding. The processing quality is significantly superior to laser processing. 2. Higher processing efficiency: Enables continuous batch processing, greatly improving production efficiency and meeting the needs of large-scale production. 3. Lower production cost: The initial investment cost and operating energy consumption of the stamping equipment are far lower than those of laser processing equipment. Combined with the advantage of not requiring secondary processing, the economic benefits are significant. 4. Greater versatility: The die core... Both the rod and the stamping head adopt a detachable structure. By replacing the mold core rod and stamping head with different specifications, it can be adapted to stainless steel round tubes of different lengths and inner diameters, as well as the processing requirements of limiting grooves of different sizes and shapes, reducing equipment investment costs; 5. The product performance is more stable. There is no heat-affected zone during the processing. There is no slag or oxide layer on the surface of the round tube. The fitting accuracy between the limiting groove and the limiting part is high. Moreover, the stamped limiting groove has a dense and high-strength structure, which can meet the hinge limiting requirements of the central shaft and connecting rod of the telescopic gate, effectively extending the service life of the telescopic gate; 6. The operation is more reliable. The mold core drive mechanism integrates translation and rotation functions. When the mold core rod extends, it provides stable support. When it exits, it avoids interference with the limiting groove by rotating. The operation is smooth and without jamming; The positioning mechanism adopts a combination design of upper and lower clamping blocks and positioning brackets. The positioning is accurate and does not damage the surface of the round tube, further ensuring product quality and equipment operation reliability.

[0058] The above description is only a preferred embodiment of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A method for forming the limiting part of a telescopic gate circular tube, characterized in that, Includes the following steps: 1) Insert a grooved mold core into the telescopic gate tube, the groove being used to match and form the limiting part of the telescopic gate tube; 2) The telescopic gate tube is stamped using a stamping device, thereby forming a limiting groove corresponding to the groove on the outer surface of the telescopic gate tube; 3) Rotate the mold core to release the limiting effect between the groove and the limiting groove caused by the stamping; 4) Remove the mold core to prepare for inserting the next telescopic gate tube.

2. The method for forming the limiting part of a telescopic gate tube according to claim 1, characterized in that, There are two mold cores, which are inserted into and pulled out from both ends of the telescopic gate tube, respectively.

3. The method for forming the limiting part of a telescopic gate tube according to claim 1, characterized in that, When the mold core is rotated to release the limiting position, the rotation angle of the mold core is 90°; the groove is formed on one opposite side of the mold core, and the side where the groove is located is an arc surface that fits against the inner wall of the telescopic gate tube; the adjacent side of the side where the groove is located is a plane, and the limiting position between the groove and the limiting groove is released by rotating the mold core so that the plane corresponds to the limiting groove.

4. A special forming device for the limiting part of a telescopic gate tube, characterized in that, The method for forming the limiting part as described in any one of claims 1-3 includes a feeding mechanism, a positioning mechanism, a mold core driving mechanism, and a stamping mechanism. The feeding mechanism is used to transport the telescopic gate tube to the preset processing position and to remove the processed tube from the processing area; The positioning mechanism, located at the processing position, is used to clamp and fix the retractable gate tube. The mold core drive mechanism is used to drive the mold core to move back and forth and rotate along the axial direction; A stamping mechanism is used to stamp and form a limiting groove on the round tube of a telescopic gate.

5. The special forming device for the limiting part of the telescopic gate tube according to claim 4, characterized in that, The mold core drive mechanism includes a mold core translation drive assembly, a mold core rotation drive assembly, and a mold core rod. The mold core rotation drive assembly is mounted on the mold core translation drive assembly, and the mold core rod is fixed on the mold core rotation drive assembly.

6. The special forming device for the limiting part of the telescopic gate tube according to claim 5, characterized in that, The outer diameter of the mold core rod is adapted to the inner diameter of the stainless steel round tube. The mold core rod is provided with an arc-shaped side and a flat surface. The arc-shaped side is provided with a number of forming grooves that are adapted to the shape of the limiting groove of the round tube along its axial direction. The mold core rod can move along the axial direction of the round tube to extend into or out of the round tube.

7. A special forming device for the limiting part of a telescopic gate tube according to claim 4, characterized in that, The stamping mechanism includes a stamping drive and a stamping base. The lower end of the stamping base is provided with a stamping head corresponding to the contour of the limiting groove. The stamping drive drives the stamping base to move up and down in the vertical direction to stamp and form the outer wall of the round tube.

8. The special forming device for the limiting part of the telescopic gate tube according to claim 4, characterized in that, The positioning mechanism includes a positioning bracket and a clamping assembly. The positioning bracket is provided with an arc-shaped groove corresponding to the round tube, so that the round tube can be stably supported and positioned in the arc-shaped groove.

9. A special forming device for the limiting part of a telescopic gate tube according to claim 8, characterized in that, The clamping assembly includes a positioning cylinder, an upper clamping block and a lower clamping block arranged symmetrically, and the upper clamping block and the lower clamping block are respectively provided with an arc-shaped positioning surface adapted to the outer wall of the round tube.

10. A special forming device for the limiting part of a telescopic gate tube according to claim 4, characterized in that, The feeding mechanism mainly consists of a feeding drive cylinder, a guide rail, a feeding seat, a lifting cylinder, and a lifting bracket. The feeding seat is movably mounted on the guide rail, and the feeding drive cylinder drives the feeding seat to move back and forth along the guide rail. The lifting cylinder is vertically installed on the feeding seat, and its piston rod is fixedly connected to the lifting bracket. The lifting bracket enables stable support and lifting of the round tube, thus completing the automatic feeding and unloading of the round tube.

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