Square tube punching device

Abstract

The utility model discloses a square tube punching device, and belongs to the technical field of punching equipment. Comprising a main machine frame, an auxiliary machine frame, a punching mechanism and a driving mechanism, the main machine frame and the auxiliary machine frame are detachably connected, and during use, a pipe to be punched is flatly laid along the main machine frame and the auxiliary machine frame; a portal frame is arranged on the main machine frame, the punching mechanism is installed on the portal frame and can slide left and right, the driving mechanism is installed on one side of the portal frame, and the output end of the driving mechanism is connected with the punching mechanism to drive the punching mechanism to slide. At least two pipes to be punched can be placed on the main machine frame in the sliding stroke range of the punching mechanism side by side. The punching mechanism comprises a telescopic rod, a punch and a pre-tightening mechanism, the punch and the pre-tightening mechanism are installed on the telescopic rod, during punching, the pre-tightening mechanism is driven by the telescopic rod to abut against a pipe to be punched, and then the pipe is punched through the punch; according to the square tube punching device, punching operation can be conducted uninterruptedly, and the square tube punching efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a punching device, in particular to a square tube punching device, and belongs to the technical field of punching equipment. Background Art

[0002] Currently, square tubes are common structural materials and are widely used in the fields of construction, furniture, decoration, etc. When assembling and installing square tubes and components, it is sometimes necessary to pre-punch them for avoidance or connection, which requires the use of a square tube punching device. Punching is a common and frequently used processing equipment in industrial production. At present, the common punching equipment for square tubes mainly includes a fixed mold and a punching mechanism, in which the fixed mold is used to fix the square tube to be processed. On this basis, the punching mechanism works to punch holes on the fixed square tube to realize the punching processing of the square tube.

[0003] The existing square tube punching equipment needs to put the square tube on a matching mold and then punch it. However, after each worker clamps the square tube, he needs to wait for the punching to be completed and remove the square tube before continuing the next square tube punching operation. This method leads to a long square tube punching operation cycle. At the same time, there are certain risks when disassembling and assembling the square tube, and it is easy to be damaged by the involvement of the punching structure.

[0004] In addition, since there are many types of square tubes, the existing punching dies are not easy to adjust and cannot effectively adapt to square tubes of different sizes, so the processed models are single, which is not conducive to the use of users. At the same time, the complicated adjustment method will also affect the user experience. Moreover, the existing punching dies do not have a good fixing effect and are easy to shake during punching, which will affect the position of the punching. Summary of the Invention

[0005] In order to overcome the above-mentioned deficiencies of the prior art, the utility model provides a square tube punching device.

[0006] The technical solution adopted by the utility model is: designing a square tube punching device, which includes a main frame, an auxiliary frame, a punching mechanism and a driving mechanism. The main frame and the auxiliary frame are detachably connected. When in use, the pipe to be punched is laid flat along the main frame and the auxiliary frame; a gantry is provided on the main frame, the punching mechanism is installed on the gantry and can slide left and right, the driving mechanism is installed on one side of the gantry, and its output end is connected to the punching mechanism to drive the punching mechanism to slide. At least two pipes to be punched can be placed side by side on the main frame within the sliding stroke range of the punching mechanism.

[0007] The punching mechanism includes a telescopic rod, a punch and a pre-tightening mechanism. The punch and the pre-tightening mechanism are respectively installed on the telescopic rod. When punching, the pre-tightening mechanism is driven by the telescopic rod to press against the pipe to be punched, and then the punch punches it.

[0008] The pre-tightening mechanism includes a pre-tightening plate, a guide rod, a return spring and a fixed plate. The fixed plate is installed on the telescopic rod. The pre-tightening plate and the fixed plate are connected through the guide rod. A guide rod is fixed at each end of the pre-tightening plate. The guide rod is slidably connected to the fixed plate. A return spring is provided on the guide rod between the pre-tightening plate and the fixed plate. A punching channel allowing the punch to pass through is provided on the pre-tightening plate.

[0009] Furthermore, a hook is provided on the front side of the main frame, and at least two hooks are provided side by side. The auxiliary frame is formed by welding a plurality of rectangular tubes, and the rectangular tubes on the rear side of the auxiliary frame can be mounted on the hook.

[0010] Furthermore, the present design also includes a first limiting mechanism. Two groups of first limiting mechanisms are arranged on the main frame under the gantry. The first limiting mechanism and the main frame form a first limiting slot. The pipe to be punched is clamped in the first limiting slot for punching. The width of the first limiting slot is adjustable.

[0011] Furthermore, the first limiting mechanism includes a first limiting plate, and at least two parallel limiting adjustment openings are provided on the main frame. The limiting adjustment openings are arranged horizontally, and the first limiting plate is fixed to the limiting adjustment openings by a bolt assembly. The two first limiting plates are arranged relative to each other to form the first limiting mechanism.

[0012] Furthermore, the present design also includes a second limiting mechanism. Two groups of second limiting mechanisms are arranged on the auxiliary frame. The second limiting mechanism is arranged opposite to the first limiting mechanism. The second limiting mechanism and the auxiliary frame form a second limiting slot. When in use, the pipe to be punched is inserted into the second limiting slot and then pushed into the first limiting slot for punching. The width of the second limiting slot is adjustable.

[0013] Furthermore, the second limiting mechanism includes a second limiting plate, a limiting adjustment sleeve is provided on the second limiting plate, the second limiting plate is slidably connected to the rectangular tube on the front side of the auxiliary frame through the limiting adjustment sleeve, and the two second limiting plates constitute the second limiting mechanism, a fixing hole is provided on the adjusting sleeve, a fixed threaded barrel is provided at the fixing hole, and a fixing screw is provided on the fixed threaded barrel.

[0014] Furthermore, the first limiting mechanism and the second limiting mechanism are respectively configured as trumpet-shaped structures, with the large end of the first limiting mechanism facing forward and the large end of the second limiting mechanism facing upward.

[0015] Furthermore, a slide is provided on the gantry, a slide is provided in the slide, the punching mechanism is fixed on the slide, and the driving mechanism adopts a telescopic rod, the telescopic end of which is fixedly connected to the slide.

[0016] Furthermore, the slide plate is an L-shaped plate, the horizontal wall plate of which is mounted on the punching mechanism, and the vertical wall plate is mounted on the telescopic end of the driving mechanism.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] The utility model sets the punching mechanism into a slidable structure and is equipped with a driving mechanism for driving the punching mechanism to slide left and right. At least two pieces of pipes to be punched can be placed side by side on the main frame within the sliding stroke range of the punching mechanism. When the punching mechanism is punching at one station, the worker can clamp the square pipe at the other station, so that the punching mechanism can slide left and right to punch alternately, reducing its idle time. There is no need to wait for the punching to be completed and remove the square pipe punching mechanism before continuing the next square pipe punching operation. This method can shorten the square pipe punching operation cycle and improve the punching efficiency. At the same time, when disassembling and assembling the square pipe, since the punching mechanism is punching at another station, it does not affect the station where the square pipe is being disassembled and replaced, and is not easily damaged by the punching structure, thereby reducing the operation risk.

[0019] In addition, the utility model adopts the pre-tightening mechanism of the punching mechanism to compress the pipe to be punched, which can be applied to clamp pipes of different specifications, so that various pipe models can be processed, which is convenient for users to use and provides users with a good user experience. In addition, an adjustable first limiting mechanism and a second limiting mechanism are added to assist in fixing the pipe to be punched, so that it has a good fixing effect, is not easy to shake during punching, and improves the punching accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 This is the axonometric measurement of the main frame and auxiliary frame of the utility model after they are separated Figure 1 Schematic diagram.

[0022] Figure 2 This is the axonometric measurement of the main frame and auxiliary frame of the utility model after they are separated Figure 2 Schematic diagram.

[0023] Figure 3 This is a schematic diagram of the axonometric view of the main frame and auxiliary frame of the utility model after assembly.

[0024] Figure 4 This is a schematic diagram of the utility model after loading the pipe to be punched.

[0025] Figure 5 This is a schematic diagram of the assembly of the punching mechanism and related parts of the utility model.

[0026] In the figure: 1. Main frame; 2. Auxiliary frame; 3. Punching mechanism; 4. Driving mechanism; 5. Gantry; 6. Telescopic rod; 7. Punch; 8. Preload mechanism; 9. Preload plate; 10. Guide rod; 11. Return spring; 12. Fixed plate; 13. Punching channel; 14. Hook; 15. First limit slot; 16. First limit plate; 17. Limit adjustment port; 18. Second limit slot; 19. Second limit plate; 20. Limit adjustment sleeve; 21. Fixing screw; 22. Slide; 23. Slide plate. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0028] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] Example 1

[0030] like Figure 1-5As shown: A square tube punching device includes a main frame 1, an auxiliary frame 2, a punching mechanism 3 and a driving mechanism 4. The main frame 1 and the auxiliary frame 2 are detachably connected. When in use, the pipe to be punched is laid flat along the main frame 1 and the auxiliary frame 2. Since the main frame 1 and the auxiliary frame 2 are detachably connected, the distance between the main frame 1 and the auxiliary frame 2 can be adjusted for pipes to be punched of different lengths to facilitate better placement of the pipes. If the pipe is short, the main frame 1 and the auxiliary frame 2 are kept connected for use. If the pipe is long, the auxiliary frame 2 is removed and pulled out so that it is a certain distance away from the main frame 1 for use to better support the pipe to be punched. The main frame 1 is provided with a gantry 5, the punching mechanism 3 is mounted on the gantry 5 and can slide left and right, the driving mechanism 4 is fixedly mounted on one side of the gantry 5, and its output end is connected to the punching mechanism 3 to drive the punching mechanism 3 to slide. At least two pipes to be punched can be placed side by side on the main frame 1 within the sliding range of the punching mechanism 3. When in use, the punching mechanism 3 punches a pipe on the main frame 1, and the staff then places another pipe. After the first pipe is punched, the punching mechanism 3 slides down to the other pipe under the drive mechanism 4 to punch. At this time, the staff removes the first pipe that has been punched and replaces it with the third pipe to be punched. This cycle is repeated, which can greatly improve the efficiency of the punching process.

[0031] In this embodiment, the punching mechanism 3 includes a telescopic rod 6, a punch 7 and a pre-tightening mechanism 8. The telescopic rod 6 adopts a hydraulic mechanism (the existing technology can be used and will not be described in detail). The punch 7 and the pre-tightening mechanism 8 are respectively installed on the telescopic rod 6. When punching, the pre-tightening mechanism 8 is driven by the telescopic rod 6 to press against the pipe to be punched, and then the punch 7 punches it; specifically, when punching, the telescopic rod 6 drives the punch 7 and the pre-tightening mechanism 8 to descend at the same time, and the pre-tightening mechanism 8 reaches the pipe to be punched in advance and presses it, and then the telescopic rod 6 continues to drive the punch 7 downward until the punch 7 punches the clamped pipe to be punched. After the punching is completed, the telescopic rod 6 drives the punch 7 and the pre-tightening mechanism 8 to move upward and away from the pipe at the same time, takes out the punched pipe and replaces it with a new pipe to be punched, and the cycle is repeated.

[0032] In this embodiment, the preload mechanism 8 includes a preload plate 9, a guide rod 10, a return spring 11, and a fixed plate 12. The fixed plate 12 is fixedly mounted on the telescopic rod 6. The preload plate 9 and the fixed plate 12 are connected via the guide rod 10. A guide rod 10 is fixed to each end of the preload plate 9. The guide rod 10 is slidably connected to the fixed plate 12. A return spring 11 is provided on the guide rod 10 located between the preload plate 9 and the fixed plate 12. To prevent the guide rod 10 from detaching from the fixed plate 12, a limiting disc is provided at the upper end of the guide rod 10. Alternatively, the two ends of the return spring 11 may be fixedly connected to the fixed plate 12 and the preload plate 9, respectively. The preload plate 9 is provided with a punching channel 13, which is generally a through-hole structure, to allow the punch 7 to pass through. During punching, the telescopic rod 6 drives the punch 7 and the pre-tightening mechanism 8 downward simultaneously. The pre-tightening plate 9 of the pre-tightening mechanism 8 reaches the pipe to be punched in advance. As the telescopic rod 6 continues to descend, the pre-tightening plate 9 slides upward relative to the fixed plate 12, while compressing the return spring 11. The pre-tightening plate 9 is pressed against the pipe to be punched under the action of the return spring 11. During the process, the telescopic rod 6 continues to drive the punch 7 downward until the punch 7 punches the clamped pipe to be punched. After punching is completed, the telescopic rod 6 drives the punch 7 to first leave the pipe, and then the pre-tightening plate 9 gradually releases the pipe until the pre-tightening mechanism 8 moves upward and leaves the pipe. The punched pipe is removed and replaced with a new pipe to be punched, and the cycle continues.

[0033] Example 2

[0034] This embodiment, based on Example 1, provides a specific structure for detachably connecting a main frame 1 and an auxiliary frame 2. In this embodiment, an L-shaped hook 14 is provided on the front side of the main frame 1, with at least two hooks 14 arranged side by side. The auxiliary frame 2 is welded from multiple rectangular tubes, with a transverse rectangular tube provided on each of the front and rear ends of the auxiliary frame 2. The rectangular tube on the rear side of the auxiliary frame 2 can be mounted on the hooks 14, thereby achieving a detachable connection between the main frame 1 and the auxiliary frame 2.

[0035] Example 3

[0036] This embodiment is based on the embodiment 2, and further optimizes and refines the structure of the square tube punching device, specifically:

[0037] The square tube punching device described in this embodiment also includes a first limiting mechanism. Two groups of first limiting mechanisms are arranged on the main frame 1 under the gantry 5. The first limiting mechanism and the main frame 1 form a first limiting slot 15. The pipe to be punched is clamped in the first limiting slot 15 for punching, which is more convenient for the accurate placement of the pipe to be punched and the clamping and limiting of the pipe to be punched by the pre-tightening mechanism 8. The width of the first limiting slot 15 is adjustable and can be suitable for punching pipes of various specifications.

[0038] This embodiment provides a specific first limiting mechanism structure, which includes a first limiting plate 16. The main frame 1 is provided with at least two parallel limiting adjustment openings 17, each of which is arranged horizontally. The first limiting plate 16 is fixed to the limiting adjustment openings 17 via a bolt assembly. The two first limiting plates 16 are arranged opposite each other to form the first limiting mechanism. When the width of the first limiting slot 15 needs to be adjusted, the bolt assembly on the first limiting plate 16 is loosened, and then the first limiting plate 16 is slid along the limiting adjustment openings 17. The distance between the two first limiting plates 16 constituting the first limiting mechanism is adjusted to obtain first limiting slots 15 of different widths.

[0039] The first limit plate 16 is an L-shaped plate. Its horizontal wall is threaded with bolts and connected to the limit adjustment port 17. Its vertical wall and the main frame 1 form a first limit slot 15. The height of the vertical wall (or the height of the first limit plate 16) is lower than the height (or thickness) of the pipe to be punched, allowing the pre-tightening mechanism 8 to effectively press against the pipe to be punched. To increase the structural strength of the first limit plate 16, a reinforcing rib can be provided between its vertical and horizontal wall panels.

[0040] Example 4

[0041] This embodiment is based on the embodiment 3, and further optimizes and refines the structure of the square tube punching device, specifically:

[0042] The square tube punching device described in this embodiment also includes a second limiting mechanism. Two sets of second limiting mechanisms are provided on the auxiliary frame 2. The second limiting mechanisms are arranged opposite the first limiting mechanisms. The second limiting mechanisms and the auxiliary frame 2 form a second limiting slot 18. During use, the pipe to be punched is inserted into the second limiting slot 18 and then pushed into the first limiting slot 15 for punching. The pipe to be punched is simultaneously limited by the first limiting slot 15 and the second limiting slot 18, resulting in more stable and reliable positioning and higher punching accuracy. The width of the second limiting slot 18 is adjustable to accommodate different pipe punching applications.

[0043] This embodiment provides a specific second limiting mechanism structure, the second limiting mechanism includes a second limiting plate 19, a limiting adjustment sleeve 20 is provided on the second limiting plate 19, which is cut from a rectangular tube, and the second limiting plate 19 is slidably connected to the rectangular tube on the front side of the auxiliary frame 2 through the limiting adjustment sleeve 20. The two second limiting plates 19 constitute the second limiting mechanism, a fixing hole is provided on the adjusting sleeve, a fixing threaded barrel is provided at the fixing hole, and a fixing screw 21 is provided on the fixing threaded barrel. The adjusting sleeve is fixed or released by rotating the fixing screw 21.

[0044] Example 5

[0045] This embodiment is based on the fourth embodiment, and further optimizes and refines the structure of the square tube punching device, specifically:

[0046] The square tube punching device described in this embodiment has a first limiting mechanism and a second limiting mechanism, each of which is configured as a trumpet-shaped structure. Specifically, the vertical plate of the first limiting plate 16 and the second limiting plate 19 are configured as bent plates, so that the first limiting mechanism and the second limiting mechanism each form a trumpet-shaped structure. The large end of the first limiting mechanism faces forward, and the large end of the second limiting mechanism faces upward, which facilitates the quick insertion of the pipe to be punched into the first limiting mechanism and the second limiting mechanism, and ensures a reliable insertion. When placing the pipe to be punched, first insert the pipe to be punched into the second limiting mechanism from top to bottom, and then push the pipe to be punched backward and insert it into the first limiting mechanism.

[0047] Example 6

[0048] This embodiment is based on the embodiment 5, and further optimizes and refines the structure of the square tube punching device, specifically:

[0049] The square tube punching device described in this embodiment has a slide 22 provided on its gantry 5, a slide 23 provided in the slide 22, the punching mechanism 3 is fixed on the slide 23, and the driving mechanism 4 adopts a hydraulic telescopic rod 6, which can also be an electric telescopic rod 6 or a screw structure, etc., and its telescopic end is fixedly connected to the slide 23.

[0050] More specifically, the slide plate 23 is an L-shaped plate, the horizontal wall plate of which is mounted on the punching mechanism 3 , and the vertical wall plate is mounted on the telescopic end of the driving mechanism 4 .

[0051] When using the present invention, the distance between the auxiliary frame 2 and the main frame 1 is adjusted according to the length of the pipe to be punched, and then the width of the first limit slot 15 and the second limit slot 18 is adjusted according to the width of the pipe to be punched. In the initial state, two pipes to be punched are placed at the same time, and the punching device is started, so that the driving mechanism 4 drives the punching mechanism 3 to slide left and right at a certain time interval, and the punching mechanism 3 drives the punch 7 downward at a certain time interval to punch the pipe to be punched. This control design can be implemented using existing technology and will not be repeated here. The telescopic rod 6 of the punching mechanism 3 drives the punch 7 and the pre-tightening mechanism 8 to move downward at the same time. The pre-tightening plate 9 of the pre-tightening mechanism 8 reaches the pipe to be punched in advance. As the telescopic rod 6 continues to move downward, the pre-tightening plate 9 slides upward relative to the fixed plate 12, and at the same time compresses the return spring 11. The pre-tightening plate 9 is pressed against the pipe to be punched under the action of the return spring 11. During the process, the telescopic rod 6 continues to drive the punch 7 downward until the punch 7 punches the clamped pipe to be punched. After the punching is completed, the telescopic rod 6 drives the punch 7 to leave the pipe first, and then the pre-tightening plate 9 gradually releases the pipe until the pre-tightening mechanism 8 moves upward and leaves the pipe. Then, the punching mechanism 3 slides to the top of another pipe to be punched under the action of the driving mechanism 4 to punch it. At the same time, the staff takes out the punched pipe and replaces it with a new pipe to be punched, and the cycle is repeated.

[0052] It is understandable that, since the punching device has two independent sets of limit mechanisms on the left and right sides, the slot widths of the limit mechanisms on the left and right sides can be set respectively, so that two specifications of pipes can be punched at the same time.

[0053] In order to improve the punching quality, a mold core can also be set (not shown in the accompanying drawings, and the mold core structure commonly used in punching molds can be used). A mold core is set in each first limit slot 15, and the mold core is fixed to the rear side of the main frame 1 through a steel pipe. When punching, the pipe to be punched is inserted into the mold core for punching. After punching, the deformation of the punching part of the pipe is smaller and the quality is better.

[0054] In addition, in the description of the present invention, unless otherwise specified, the terms "multiple," "multiple roots," and "multiple groups" mean two or more, and "several," "several roots," and "several groups" mean one or more. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inside," and "outside" used to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings. These are intended solely to facilitate the description of the present invention and to simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first," "second," and "third" used are used solely for descriptive purposes and should not be construed as indicating or implying relative importance.

[0055] The specific embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention.

Claims

1. A square tube punching device, characterized in that: The machine comprises a main frame, an auxiliary frame, a punching mechanism and a driving mechanism. The main frame and the auxiliary frame are detachably connected. When in use, the pipe to be punched is laid flat along the main frame and the auxiliary frame. A gantry is provided on the main frame. The punching mechanism is mounted on the gantry and can slide left and right. The driving mechanism is mounted on one side of the gantry, and its output end is connected to the punching mechanism to drive the punching mechanism to slide. At least two pipes to be punched can be placed side by side on the main frame within the sliding range of the punching mechanism. The punching mechanism includes a telescopic rod, a punch and a pre-tightening mechanism. The punch and the pre-tightening mechanism are respectively installed on the telescopic rod. When punching, the pre-tightening mechanism is driven by the telescopic rod to press against the pipe to be punched, and then the punch punches it. The pre-tightening mechanism includes a pre-tightening plate, a guide rod, a return spring and a fixed plate. The fixed plate is installed on the telescopic rod. The pre-tightening plate and the fixed plate are connected through the guide rod. A guide rod is fixed at each end of the pre-tightening plate. The guide rod is slidably connected to the fixed plate. A return spring is provided on the guide rod between the pre-tightening plate and the fixed plate. A punching channel allowing the punch to pass through is provided on the pre-tightening plate.

2. A square tube punching device according to claim 1, characterized in that: The front side of the main frame is provided with a hook, and at least two hooks are arranged side by side. The auxiliary frame is formed by welding a plurality of rectangular tubes, and the rectangular tubes on the rear side of the auxiliary frame can be mounted on the hook.

3. A square tube punching device according to claim 2, characterized in that: It also includes a first limiting mechanism. Two groups of first limiting mechanisms are set on the main frame under the gantry. The first limiting mechanism and the main frame form a first limiting slot. The pipe to be punched is clamped in the first limiting slot for punching. The width of the first limiting slot is adjustable.

4. A square tube punching device according to claim 3, characterized in that: The first limiting mechanism includes a first limiting plate. At least two parallel limiting adjustment openings are provided on the main frame. The limiting adjustment openings are arranged horizontally. The first limiting plate is fixed to the limiting adjustment openings by a bolt assembly. The two first limiting plates are arranged relative to each other to form the first limiting mechanism.

5. A square tube punching device according to claim 4, characterized in that: It also includes a second limiting mechanism. Two groups of second limiting mechanisms are arranged on the auxiliary frame. The second limiting mechanism is arranged opposite to the first limiting mechanism. The second limiting mechanism and the auxiliary frame form a second limiting slot. When in use, the pipe to be punched is inserted into the second limiting slot and then pushed into the first limiting slot for punching. The width of the second limiting slot is adjustable.

6. A square tube punching device according to claim 5, characterized in that: The second limiting mechanism includes a second limiting plate, a limiting adjustment sleeve is provided on the second limiting plate, the second limiting plate is slidably connected to the rectangular tube on the front side of the auxiliary frame through the limiting adjustment sleeve, and the two second limiting plates constitute the second limiting mechanism, a fixing hole is provided on the adjusting sleeve, a fixing threaded barrel is provided at the fixing hole, and a fixing screw is provided on the fixed threaded barrel.

7. A square tube punching device according to claim 6, characterized in that: The first limiting mechanism and the second limiting mechanism are respectively configured as trumpet-shaped structures, with the large end of the first limiting mechanism facing forward and the large end of the second limiting mechanism facing upward.

8. A square tube punching device according to any one of claims 1 to 7, characterized in that: The gantry is provided with a slideway, a slide plate is provided in the slideway, the punching mechanism is fixed on the slide plate, and the driving mechanism adopts a telescopic rod, the telescopic end of which is fixedly connected to the slide plate.

9. The square tube punching device according to claim 8, characterized in that: The slide plate is an L-shaped plate, the horizontal wall plate of which is used to mount the punching mechanism, and the vertical wall plate of which is used to mount the telescopic end of the driving mechanism.

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