Arc-shaped round pipe roof beam steel member punching device

Abstract

The utility model discloses an arc round pipe roof beam steel member punching device, this arc round pipe roof beam steel member punching device includes: frame and punching mechanism, punching mechanism includes punch -out subassembly and positioning subassembly, frame includes first fixed plate, second fixed plate, punch -out subassembly includes hydraulic oil cylinder, pull rod, sliding block and punch needle, hydraulic oil cylinder installs in first fixed plate, the bottom end of pull rod is connected in the output of hydraulic oil cylinder, and pull rod top extends to the top side of second fixed plate, and the sliding groove of pull rod top side surface is slidably fitted in, and punch needle is embedded in sliding block, and positioning subassembly includes inner seat body, outer seat body, and the top side of second fixed plate is installed in the inner seat body of pull rod correspondence, and the outside of outer seat body is sleeved in the inner seat body, and the side wall of sliding block and inner seat body is slidably fitted. The punch -out subassembly of arc round pipe roof beam steel member punching device adopts hydraulic oil cylinder as power source, and the linear motion is converted into the sliding of sliding block through pull rod and sliding block mechanism.

Description

Technical Field

[0001] This utility model relates to the technical field of circular tube punching equipment, and in particular to a punching device for arc-shaped circular tube roof beam steel components. Background Technology

[0002] In steel structure engineering, curved circular tube roof beams are widely used due to their beautiful shape and good structural performance. The processing of these components, especially the drilling of holes in the tube wall (such as for connecting bolts, pipeline passage, or weight reduction), is a crucial step in the production process. Currently, the punching of these curved circular tube components typically employs the following methods: A general-purpose punch press with simple fixtures: The curved tube is placed on the worktable of the general-purpose punch press, positioned and clamped using simple tooling such as V-blocks and pressure plates, and then punched. This method has significant shortcomings: First, the radial and circumferential positioning of the curved tube is not stable enough, especially under the impact force of the punching, it is prone to displacement or rotation, resulting in poor punching position accuracy and low consistency; second, the fixed stroke and direction of the die on the general-purpose punch press make it difficult to flexibly adapt to the curvature changes of the curved tube surface, easily causing uneven force on the punch, accelerated wear, and even local deformation of the tube wall or poor punching quality (such as excessive burrs or non-circular holes). Drilling machine replacement: Drilling machines are used in some situations. Although the positioning accuracy is relatively controllable, drilling efficiency is far lower than punching, and the tools wear out quickly, energy consumption is high, and processing costs increase significantly, making it unsuitable for mass production needs. Dedicated punching equipment: Some punching equipment for pipes exists on the market, but most are designed for straight pipes. Their clamping and positioning mechanisms are usually unsuitable for curved pipes, especially for the stable clamping of large-curvature roof beam components. Existing punching solutions for curved pipes are often complex in structure, cumbersome to adjust, or can only adapt to pipes of a specific radius, lacking versatility and flexibility, and resulting in high equipment investment and maintenance costs.

[0003] Therefore, existing processing technologies and methods generally suffer from problems such as insufficient positioning reliability, difficulty in guaranteeing punching accuracy and consistency, need for improved processing efficiency, poor equipment versatility, and weak adaptability to curved surfaces when dealing with the punching requirements of curved tubular roof beam steel components. There is an urgent need for a dedicated punching device with a reasonable structural design, accurate and reliable positioning, simple operation, and effective adaptation to the characteristics of curved tubular fittings, in order to improve processing quality, efficiency, and economic benefits. Utility Model Content

[0004] Therefore, it is necessary to provide a punching device for arc-shaped circular tube roof beam steel components to address the technical problems of insufficient punching efficiency and consistency of existing punching equipment for circular tube steel components.

[0005] A punching device for arc-shaped circular tube roof beam steel components includes a frame and a punching mechanism, which is installed at one end of the frame.

[0006] The punching mechanism includes a punching component and a positioning component. The positioning component is located at the top of the corresponding end of the frame, and the punching component is located at the bottom of the frame corresponding to the positioning component. The output end of the punching component is matched with the positioning component.

[0007] The frame includes a first fixing plate, a second fixing plate, and several columns; the first fixing plate is located at the bottom of one end of the frame; the bottom ends of the several columns are respectively connected to the top surface of the first fixing plate; the second fixing plate is connected to the top of the several columns.

[0008] The stamping assembly includes a hydraulic cylinder, a pull rod, a slider, and a punch; the hydraulic cylinder is mounted on a first fixed plate, and the output end of the hydraulic cylinder faces the second fixed plate; the bottom end of the pull rod is connected to the output end of the hydraulic cylinder, and the top of the pull rod, which has an inclined groove on its side surface, extends through the second fixed plate to the top side of the second fixed plate; the slider is slidably fitted into the groove on the top side surface of the pull rod; the punch is embedded in the end of the slider facing away from the pull rod.

[0009] The positioning assembly includes an inner seat, an outer seat, a drive cylinder, and a positioning pin. The inner seat is mounted on the top side of the second fixed plate corresponding to the pull rod, and the inner seat is slidably sleeved on the top side surface of the pull rod. The outer seat is sleeved on the outside of the inner seat, and a cylindrical receiving space is reserved between the outer seat and the inner seat. The drive cylinder is located on the adjacent side of the outer seat, and the output end of the drive cylinder faces the outer seat. One end of the positioning pin is connected to the output end of the drive cylinder, and the other end of the positioning pin passes through the side wall of the outer seat and extends into the receiving space.

[0010] The slider slides against the side wall of the inner seat.

[0011] In one embodiment, the above-mentioned stamping assembly includes at least one slider, and each slider is connected to a corresponding punch, thereby realizing multi-point synchronous punching of the steel component.

[0012] In one embodiment, the aforementioned sliders are configured as multiple sliders, which are distributed at equal angles around the geometric central axis of the pull rod.

[0013] In one embodiment, three sliders and three punches are provided.

[0014] In one embodiment, the above-mentioned stamping assembly is further provided with a guide block for each punch. The guide block is fitted into the outer surface of the side wall of the inner seat body corresponding to the punch, thereby abutting against the inner wall of the steel component. Furthermore, each guide block is provided with a guide hole corresponding to the feed and reset path of the punch, and the punch moves and cooperates in the corresponding guide hole.

[0015] In one embodiment, the above-mentioned stamping assembly is further provided with a die holder and a die insert for each punch. The die holder is fitted into the inner surface of the side wall of the outer seat body corresponding to the punch, thereby being disposed on the outer side of the steel component. The die insert is installed on the side of the die holder facing the steel component in cooperation with the punch, and the inner end of the die insert abuts against the outer wall of the steel component. When the punch punches a hole in the steel component, the outer end of the punch is engaged in the die insert.

[0016] In one embodiment, the positioning component described above is further provided with an annular pad on the bottom surface of the outer seat, and the annular pad is disposed between the outer seat and the second fixing plate.

[0017] In one embodiment, the positioning component described above is further provided with an annular positioning plate corresponding to the receiving space, and the annular positioning plate is disposed at the bottom of the receiving space.

[0018] In one embodiment, a connecting sleeve and a limiting rod are sequentially provided between the output end of the hydraulic cylinder and the pull rod, with the connecting sleeve sleeved on the output end of the hydraulic cylinder and the limiting rod disposed between the connecting sleeve and the pull rod.

[0019] In one embodiment, the end face diameter of the aforementioned limiting rod is larger than the through hole through which the pull rod passes in the second fixing plate.

[0020] In one embodiment, the top end of the limiting rod and the bottom end of the pull rod are movably engaged by a locking block.

[0021] In one embodiment, the output end of the hydraulic cylinder is further provided with a guide shaft and a connecting plate. The guide shaft is squarely arranged on the first fixed plate along the parallel trajectory of the lifting rod. One end of the connecting plate is provided and connected to the connecting sleeve between the limiting rods, and the other end of the connecting plate is slidably sleeved to the guide shaft.

[0022] In one embodiment, the above-mentioned punching device for arc-shaped circular tube roof beam steel components further includes a hydraulic generator, which is disposed at the other end of the frame relative to the punching mechanism, and the output end of the hydraulic generator is connected to a hydraulic cylinder.

[0023] The punching assembly of the aforementioned arc-shaped circular tube roof beam steel component punching device uses a hydraulic cylinder as the power source, converting linear motion into sliding motion of the slider through a pull rod and slider mechanism. An inclined groove on the pull rod engages with the slider, allowing the vertical movement of the hydraulic cylinder to drive the slider to slide horizontally along the inner seat sidewall, thus driving the punch to complete the punching. The hydraulic cylinder provides powerful punching force, enabling rapid penetration of the steel component tube wall and improving punching efficiency. Simultaneously, the slider sliding design allows the punch's movement trajectory to better adapt to the curved surface of the arc-shaped tube, reducing lateral forces during the punching process. The positioning assembly drives a positioning pin through a drive cylinder to extend into the receiving space, achieving radial clamping of the steel component. This structure ensures the steel component remains fixed during punching, reducing offset or rotation and improving the accuracy and consistency of the punching position. Furthermore, the automatic positioning and clamping of the steel component by the positioning assembly reduces manual intervention. This simplifies the operation process, improves production efficiency, and reduces the labor intensity of operators. In addition, the punch is embedded in the slider, which slides against the inner seat sidewall, providing stable guidance for the punch. This helps ensure that the punch contacts the tube wall vertically or at a predetermined angle, reducing tilting or offset during the punching process, thereby improving the hole wall quality (such as reducing burrs and deformation) and ensuring the consistency of multi-hole processing. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the punching device for the arc-shaped circular tube roof beam steel component in one embodiment; Figure 2 This is a partial structural schematic diagram of the punching device for the arc-shaped circular tube roof beam steel component in one embodiment; Figure 3 This is a partial structural schematic diagram of the punching device for the arc-shaped circular tube roof beam steel component in one embodiment; Figure 4 This is a partial structural schematic diagram of the punching device for the steel component of the arc-shaped circular tube roof beam in one embodiment. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0031] Please see Figures 1 to 4This utility model discloses a punching device 1 for arc-shaped circular tube roof beam steel components. The punching device 1 includes a frame 10 and a punching mechanism 20, which is installed at one end of the frame 10. The punching mechanism 20 includes a punching component 21 and a positioning component 22. The positioning component 22 is disposed on the top of the corresponding end of the frame 10 for clamping and positioning the end of the arc-shaped circular tube roof beam steel component to be punched. The punching component 21 is disposed at the bottom of the frame 10 corresponding to the positioning component 22, and the output end of the punching component 21 cooperates with the positioning component 22, thereby enabling the punching component 21 to avoid punching the clamped steel component. Specifically, the frame 10 includes a first fixing plate 11, a second fixing plate 12, and a plurality of columns 13; the first fixing plate 11 is disposed at the bottom of one end of the frame 10; the bottom ends of the plurality of columns 13 are respectively connected to the top side surface of the first fixing plate 11; the second fixing plate 12 is connected to the top of the plurality of columns 13, thereby forming the mounting structure of the punching mechanism 20. Based on this, the stamping assembly 21 includes a hydraulic cylinder 211, a pull rod 212, a slider 213, and a punch 214; the hydraulic cylinder 211 is mounted on the first fixing plate 11, and the output end of the hydraulic cylinder 211 faces the second fixing plate 12; the bottom end of the pull rod 212 is connected to the output end of the hydraulic cylinder 211, and the top of the pull rod 212, which has an inclined groove on its side surface, extends through the second fixing plate 12 to the top side of the second fixing plate 12; the slider 213 is slidably fitted in the groove on the top side surface of the pull rod 212; the punch 214 is embedded in the end of the slider 213 facing away from the pull rod 212. The positioning assembly 22 includes an inner seat 221, an outer seat 222, a drive cylinder 223, and a positioning pin 224. The inner seat 221 is installed on the top side of the second fixed plate 12 corresponding to the pull rod 212, and the inner seat 221 is slidably sleeved on the top side surface of the pull rod 212. The outer seat 222 is sleeved on the outside of the inner seat 221, and a cylindrical receiving space a is reserved between the outer seat 222 and the inner seat 221. The drive cylinder 223 is located on the adjacent side of the outer seat 222, and the output end of the drive cylinder 223 faces the outer seat 222. One end of the positioning pin 224 is connected to the output end of the drive cylinder 223, and the other end of the positioning pin 224 passes through the side wall of the outer seat 222 and extends to the receiving space a for positioning and clamping of the round tube steel component. More specifically, the slider 213 slides against the side wall of the inner seat 221. Thus, when the round steel component is clamped into the receiving space a between the inner seat 221 and the outer seat 222, the drive cylinder 223 drives the positioning pin 224 to clamp the steel component. Then, the hydraulic cylinder 211 drives the slider 213 to slide to the outside of the inner seat 221 through the pull rod 212, thereby punching the tube wall of the steel component through the punch 214 to complete the punching process.

[0032] Furthermore, the stamping assembly 21 includes at least one slider 213, and correspondingly, each slider 213 is connected to a punch 214, thereby realizing multi-point synchronous punching of the steel component. Specifically, in one embodiment, multiple sliders 213 are provided, and the multiple sliders 213 are distributed at equal angles around the geometric central axis of the tie rod 212, so that the multiple sliders 213 can punch the steel component synchronously from multiple angles. More specifically, in this embodiment, three sliders 213 and three punches 214 are provided.

[0033] Furthermore, the stamping assembly 21 is also provided with a guide block 215 for each punch 214. The guide block 215 is fitted into the outer surface of the side wall of the inner seat 221 corresponding to the punch 214, thereby abutting against the inner wall of the steel component. In addition, each guide block 215 is provided with a guide hole corresponding to the feed and reset path of the punch 214. The punch 214 is movably fitted into the corresponding guide hole, thereby realizing the guiding function of the guide block 215 for the punch 214.

[0034] Furthermore, the stamping assembly 21 is also provided with a die holder 216 and a die insert 217 for each punch 214. The die holder 216 is fitted into the inner surface of the side wall of the outer seat 222 corresponding to the punch 214, thereby being fitted to the outside of the steel component. The die insert 217 is installed on the side of the die holder 216 facing the steel component in cooperation with the punch 214, and the inner end of the die insert 217 abuts against the outer wall of the steel component. Thus, when the punch 214 punches a hole in the steel component, the outer end of the punch 214 fits into the die insert 217, thereby enhancing the stamping stability and accuracy of the punch 214.

[0035] Furthermore, the positioning component 22 is provided with an annular pad 225 on the bottom end face of the outer seat 222. The annular pad 225 is disposed between the outer seat 222 and the second fixing plate 12 to provide a buffer connection between the bottom end face of the outer seat 222 and the second fixing plate 12, and to absorb the mechanical vibration from the frame 10 during the operation of the equipment.

[0036] Furthermore, the positioning component 22 is also provided with an annular positioning plate 226 corresponding to the receiving space a. The annular positioning plate 226 is located at the bottom of the receiving space a to support the bottom end of the steel component clamped between the inner seat 221 and the outer seat 222 and to achieve positioning.

[0037] Furthermore, a connecting sleeve 211a and a limiting rod 211b are sequentially provided between the output end of the hydraulic cylinder 211 and the pull rod 212. The connecting sleeve 211a is sleeved on the output end of the hydraulic cylinder 211; the limiting rod 211b is provided between the connecting sleeve 211a and the pull rod 212. Thus, the output end of the hydraulic cylinder 211, i.e., the cylinder piston, is sequentially connected to the pull rod 212 through the connecting sleeve 211a and the limiting rod 211b. The end face diameter of the limiting rod 211b is larger than the through hole of the pull rod 212 through the second fixing plate 12, thereby limiting the upward thrust limit of the pull rod 212.

[0038] Specifically, in one embodiment, the top end of the limiting rod 211b and the bottom end of the pull rod 212 are movably engaged by a locking block 211c. This ensures stable power transmission between the limiting rod 211b and the pull rod 212 while avoiding a rigid connection between the pull rod 212 and the limiting rod 211b. This reduces the circumferential torsion of the pull rod 212 by other components, thereby improving the driving stability of the pull rod 212 on the punch 214.

[0039] Furthermore, the output end of the hydraulic cylinder 211 is also provided with a guide shaft 211e and a connecting plate 211d. The guide shaft 211e is squarely arranged on the first fixed plate 11 along the parallel trajectory of the lifting rod 212. One end of the connecting plate 211d is provided and connected to the connecting sleeve 211a between the limiting rod 211b, and the other end of the connecting plate 211d is slidably sleeved to the guide shaft 211e, thereby forming a guide structure to limit the output direction of the cylinder piston of the hydraulic cylinder 211, further enhancing the lifting stability of the rod 212.

[0040] Furthermore, the punching device 1 for the arc-shaped circular tube roof beam steel components also includes a hydraulic generator 30. The hydraulic generator 30 is located at the other end of the frame 10 relative to the punching mechanism 20, and the output end of the hydraulic generator 30 is connected to the hydraulic cylinder 211, thus forming the main power source of the equipment.

[0041] In summary, the punching assembly of the arc-shaped circular tube roof beam steel component punching device disclosed in this utility model uses a hydraulic cylinder as the power source, converting linear motion into sliding motion of the slider through a pull rod and slider mechanism. The inclined groove on the pull rod cooperates with the slider, allowing the vertical movement of the hydraulic cylinder to drive the slider to slide horizontally along the inner side wall of the seat, thus driving the punch to complete the punching. The hydraulic cylinder provides powerful punching force, enabling rapid penetration of the steel component tube wall and improving punching efficiency. Simultaneously, the slider sliding design allows the punch's movement trajectory to better adapt to the curved surface of the arc-shaped tube, reducing lateral forces during the punching process. The positioning assembly drives a positioning pin through a drive cylinder to extend into the receiving space, achieving radial clamping of the steel component. This structure ensures the steel component remains fixed during punching, reducing offset or rotation and improving the accuracy and consistency of the punching position. Furthermore, the automatic positioning and clamping of the steel component by the positioning assembly reduces manual intervention. This simplifies the operation process, improves production efficiency, and reduces the labor intensity of operators. Furthermore, the punch is mounted on the slider, which slides against the side wall of the inner seat, providing stable guidance for the punch. This helps ensure that the punch contacts the tube wall vertically or at a predetermined angle, reducing tilting or offset during the punching process, thereby improving the hole wall quality (such as reducing burrs and deformation) and ensuring the consistency of multi-hole processing.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A punching device for arc-shaped circular tube roof beam steel components, characterized in that, include: The frame and the punching mechanism are mounted at one end of the frame; The punching mechanism includes a punching component and a positioning component. The positioning component is located at the top of the corresponding end of the frame, and the punching component is located at the bottom of the frame corresponding to the positioning component. The output end of the punching component is matched with the positioning component. The frame includes a first fixing plate, a second fixing plate, and several columns; the first fixing plate is located at the bottom of one end of the frame; the bottom ends of the several columns are respectively connected to the top surface of the first fixing plate; the second fixing plate is connected to the top of the several columns. The stamping assembly includes a hydraulic cylinder, a tie rod, a slider, and a punch; the hydraulic cylinder is mounted on the first fixed plate, and the output end of the hydraulic cylinder faces the second fixed plate; the bottom end of the tie rod is connected to the output end of the hydraulic cylinder, and the top of the tie rod, which has an inclined groove on its side surface, extends through the second fixed plate to the top side of the second fixed plate; The slider slides into a groove on the top side surface of the pull rod; the punch is embedded in the end of the slider facing away from the pull rod. The positioning assembly includes an inner seat, an outer seat, a drive cylinder, and a positioning pin. The inner seat is mounted on the top side of the second fixed plate corresponding to the tie rod, and the inner seat is slidably sleeved on the top side surface of the tie rod. The outer seat is sleeved on the outside of the inner seat, and a cylindrical receiving space is reserved between the outer seat and the inner seat. The drive cylinder is located on the adjacent side of the outer seat, and the output end of the drive cylinder faces the outer seat. One end of the positioning pin is connected to the output end of the drive cylinder, and the other end of the positioning pin passes through the side wall of the outer seat and extends into the receiving space. The slider slides against the side wall of the inner seat.

2. The punching device for arc-shaped circular tube roof beam steel components according to claim 1, characterized in that, The stamping assembly includes at least one slider, and each slider is connected to a corresponding punch, thereby enabling multi-point synchronous punching of the steel component.

3. The punching device for arc-shaped circular tube roof beam steel components according to claim 2, characterized in that, Each punch in the stamping assembly is also provided with a guide block. The guide block is fitted into the outer surface of the side wall of the inner seat body, thereby abutting against the inner wall of the steel component. Furthermore, each guide block is provided with a guide hole for the feed and reset path of the punch, and the punch moves and cooperates in the corresponding guide hole.

4. The punching device for arc-shaped circular tube roof beam steel components according to claim 3, characterized in that, The stamping assembly is also equipped with a die holder and a die insert for each punch. The die holder is fitted into the inner surface of the side wall of the outer seat body, thereby fitting on the outside of the steel component. The die insert is installed on the side of the die holder facing the steel component, and the inner end of the die insert abuts against the outer wall of the steel component. When the punch punches a hole in the steel component, the outer end of the punch fits into the die insert.

5. The punching device for arc-shaped circular tube roof beam steel components according to claim 4, characterized in that, The positioning component is also provided with an annular pad on the bottom surface of the outer base, and the annular pad is located between the outer base and the second fixing plate.

6. The punching device for arc-shaped circular tube roof beam steel components according to claim 5, characterized in that, The positioning component is also equipped with an annular positioning plate corresponding to the receiving space, which is located at the bottom of the receiving space.

7. The punching device for arc-shaped circular tube roof beam steel components according to claim 6, characterized in that, A connecting sleeve and a limiting rod are sequentially installed between the output end of the hydraulic cylinder and the pull rod. The connecting sleeve is fitted onto the output end of the hydraulic cylinder; the limiting rod is located between the connecting sleeve and the pull rod.

8. The punching device for arc-shaped circular tube roof beam steel components according to claim 7, characterized in that, The end face diameter of the limit rod is larger than the through hole through which the pull rod passes through the second fixing plate.

9. The punching device for arc-shaped circular tube roof beam steel components according to claim 8, characterized in that, The top of the limit rod and the bottom of the pull rod are engaged by a locking block.

10. The punching device for arc-shaped circular tube roof beam steel components according to claim 9, characterized in that, The output end of the hydraulic cylinder is also equipped with a guide shaft and a connecting plate. The guide shaft is squarely set on the first fixed plate along the parallel trajectory of the lifting rod. One end of the connecting plate is set and connected to the connecting sleeve between the limit rods, and the other end of the connecting plate is slidably sleeved to the guide shaft.

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