An internal hole boring device for the end of a scaffolding steel pipe

Abstract

The present invention relates to the technical field of scaffolding steel pipe processing, and discloses a boring device for the inner hole of the end of a scaffolding steel pipe, which includes a frame. Two guide rails are installed on the surface of the frame, and a machine base is slidably connected to the surface. A main shaft is rotatably connected to the inner wall of the machine base. A driving motor is installed above the machine base. Synchronous wheels are installed on both the driving motor and the main shaft. In the present invention, by setting an expansion sealing mechanism, a sealing interception effect is achieved on the inner wall of the steel pipe. When cooling water is sprayed onto the cutting area at a high frequency, this sealing structure fully exerts its barrier effect: it not only ensures that the coolant circulates in the boring area, continuously takes away the high heat generated by the friction between the tool and the workpiece, and guarantees efficient cooling; but also blocks the path for the coolant to carry waste chips and spread into the steel pipe. During the subsequent tool withdrawal process, the airbag cover cooperates with the protection component to take out the waste chips in the steel pipe together, so that the operator does not need to perform additional waste chip cleaning operations, simplifies the operation steps, and reduces the operation difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of scaffolding steel pipe processing, and particularly to a boring device for the inner hole of the end of a scaffolding steel pipe. Background Art

[0002] Scaffolding steel pipes are key components in the field of construction. They are mostly made of high-quality steel, with their surfaces treated by galvanizing or coating with anti-rust paint, effectively resisting wind and rain erosion and extending their service life. Specific interfaces are provided at both ends, which can be closely matched with connecting parts such as fasteners and joints, and a stable three-dimensional structure can be flexibly built according to construction needs, providing a safe and reliable standing space for high-altitude operators, and at the same time carrying the transportation and storage of building materials.

[0003] During the processing of scaffolding steel pipes, it is often necessary to process the inner hole at the end, and a boring device will be used to bore the inner hole at the end. Boring is a metal processing technology, which refers to using a boring tool to process the prefabricated hole on the workpiece to enlarge the hole diameter, improve the hole accuracy and surface quality. The boring tool is installed on the spindle of a boring machine or other machine tools (such as a milling machine, machining center, etc.), and the rotation of the spindle drives the boring tool to rotate. At the same time, the workbench or the tool feeds along a certain direction, so that the boring tool cuts the hole on the workpiece, thereby changing the size, shape and surface roughness of the hole.

[0004] During the daily work process, when boring the inner hole at the end of a scaffolding steel pipe, the boring tool usually extends into the steel pipe for boring. In the prior art, during the boring process, cooling water is usually sprayed to cooperate with the boring. However, during the spraying of the cooling water, since the liquid will drive waste chips into the inner wall of the steel pipe during the spraying process, the waste chips will spread and deposit inside the pipe body. At the same time, the cooling water is also easy to flow out from the other end, thus affecting the cooling effect. The remaining liquid is also easy to cause inner wall corrosion, and it is difficult to take out the waste chips inside the steel pipe during the subsequent tool withdrawal process.

[0005] Therefore, we propose a boring device for the inner hole of the end of a scaffolding steel pipe. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a boring device for the inner hole of the end of a scaffolding steel pipe, which solves the problems that during the spraying of cooling water in the prior art, since the liquid will drive waste chips into the inner wall of the steel pipe during the spraying process, the waste chips will spread and deposit inside the pipe body, at the same time, the cooling water is also easy to flow out from the other end, thus affecting the cooling effect, the remaining liquid is also easy to cause inner wall corrosion, and it is difficult to take out the waste chips inside the steel pipe during the subsequent tool withdrawal process.

[0007] To achieve the above object, the present invention is realized through the following technical solutions: A boring device for the inner hole of the end of a scaffolding steel pipe, comprising a frame, on the surface of the frame are installed two guide rails, and a machine base is slidably connected to the surface. The inner wall of the machine base is rotatably connected to a main shaft. Above the machine base is installed a driving motor. Synchronous pulleys are installed on both the driving motor and the main shaft, and the two synchronous pulleys are connected by a synchronous belt. On the surface of the frame are installed two cylinders I, and the output end of the cylinder I is fixedly connected to the surface of the machine base. A boring assembly for boring is arranged on the surface of the main shaft. On the surface of the frame are arranged two groups of clamping and positioning devices for clamping the steel pipe. An expansion interception mechanism is arranged inside the main shaft.

[0008] The expansion interception mechanism includes a rotating sleeve rotatably connected to the inner wall of the main shaft. A main rod is slidably connected to the inner wall of the rotating sleeve. A cavity is arranged inside the main rod. A plurality of air outlets are arranged on the surface of the main rod. A balloon cover is fixedly connected to the surface of the main rod near the air outlet, forming a sealed state with the cavity. A protection assembly for protecting the balloon cover is arranged on the surface of the main rod. An expansion pushing part is arranged inside the main rod. A support device is arranged at one end of the main rod. Two cylinders II are fixedly connected to the surface of the machine base, and the output end of the cylinder II is fixedly connected to the surface of the main rod. Through the above components, by setting the expansion sealing mechanism, during the boring process, after the expansion sealing mechanism extends into the area of the steel pipe for internal processing, sealing is achieved. When the cooling water is sprayed at a high frequency to the cutting area, this sealing structure fully exerts its barrier effect: it not only ensures that the coolant circulates in the boring area, continuously taking away the high heat generated by the friction between the tool and the workpiece to ensure efficient cooling, but also blocks the path for the coolant to carry waste chips and spread into the steel pipe. During the subsequent tool withdrawal process, the balloon cover cooperates with the protection assembly to bring out the waste chips in the steel pipe together, enabling the operator to avoid additional waste chip cleaning operations, simplifying the operation steps, and reducing the operation difficulty.

[0009] Preferably, the protection assembly includes an elastic protection sleeve sleeved on the surface of the main rod. A plurality of groups of screws are inserted into the inner wall of the elastic protection sleeve. A plurality of groups of screw holes are arranged on the surface of the main rod, and the screws are threadedly connected to the inner wall of the screw holes. Through the above components, the elastic protection sleeve can be installed by the cooperation of the screws and the screw holes to protect the balloon cover, and it can deform along with the deformation of the balloon cover.

[0010] Preferably, the elastic protection sleeve is made of nylon composite material, and its thickness is greater than 2 mm.

[0011] Preferably, the expansion pushing part includes a cylinder three fixed in the inner wall of the main rod. The output end of the cylinder three extends into the cavity and is fixedly connected to a cylinder four. The output end of the cylinder four is fixedly connected to a sealing plug ring, and the sealing plug ring is slidably connected to the inner wall of the cavity. Through the above components, the cylinder three can drive the cylinder four and the sealing plug ring to move, thereby compressing the air in the cavity and discharging it from the air outlet, causing the airbag cover to expand. At the same time, the cylinder four can further drive the sealing plug ring to move, improving the expansion size.

[0012] Preferably, the support device includes a connecting sleeve threadedly connected to the inner wall of the rod body. Multiple ejector rods are slidably connected to the inner wall of the connecting sleeve. A return spring is arranged between the multiple ejector rods and the inner wall of the connecting sleeve. An extrusion cone ring is slidably connected to the inner wall of the connecting sleeve. An adjusting screw rod is rotatably connected to the inner wall of the connecting sleeve, and the adjusting screw rod is threadedly connected to the inner wall of the extrusion cone ring. Through the above components, before boring, the adjusting screw rod can be rotated. The adjusting screw rod can drive the extrusion cone ring to move. When the extrusion cone ring moves, it can drive multiple ejector rods to move. After adjusting the size to be the same as the inner diameter of the steel pipe, when boring, the multiple ejector rods can contact the inner wall of the steel pipe to achieve support, thereby improving the overall stability. The return spring can quickly reset the ejector rods.

[0013] Preferably, the return spring is sleeved on the surface of the ejector rod, and both ends of the return spring are fixedly connected to the ejector rod and the inner wall of the connecting sleeve respectively.

[0014] Preferably, the ejector rod includes a rod body and a ball. The ball is arranged in the inner wall of the rod body. Through the above components, after the ejector rod contacts the inner wall of the steel pipe, the ball in the ejector rod contacts the inner wall. When moving, the ball can reduce the friction force.

[0015] Preferably, the boring component includes a mounting ring installed in the inner wall of the main shaft. Two tool holders are slidably connected to the inner wall of the mounting ring. A tool body is installed in the tool holder through bolts. An adjusting screw rod is rotatably connected to the inner wall of the mounting ring, and the adjusting screw rod is threadedly connected to the inner wall of the tool holder. One end of the adjusting screw rod is fixedly connected to an operating head. Through the above components, a suitable tool can be inserted into the operating head in the adjusting screw rod, and then the adjusting screw rod is rotated. The adjusting screw rod can control the tool holder and the tool body to move, realizing the adjustment operation.

[0016] Preferably, the clamping and positioning device includes a bracket fixed on the inner side of the frame. A cylinder five is fixedly connected to the surface of the bracket. The output end of the cylinder five is fixedly connected to an upper clamping block. A lower clamping block is fixedly connected to the surface of the bracket. Two stabilizing rods are fixedly connected to the surface of the upper clamping block, and the stabilizing rods are slidably connected to the inner wall of the bracket. Through the above components, the cylinder five drives the upper clamping block to move, and the upper clamping block cooperates with the lower clamping block to clamp and position the scaffolding steel pipe.

[0017] Preferably, the clamping and positioning device also includes a fixed block fixed on the surface of the frame, the inner wall of the fixed block is slidably connected to the positioning block, the internal thread of the fixed block is connected to a transmission screw, one end of the transmission screw is rotatably connected to the surface of the positioning block, through the above components, through the transmission screw, the transmission screw can control the position of the positioning block, and the positioning block can fit the other end of the steel pipe for positioning processing.

[0018] In summary, the technical effects and advantages of the present invention are as follows:

[0019] 1. In the present invention, an expansion sealing mechanism is provided. During the boring process, after the expansion sealing mechanism extends into the processing area inside the steel pipe, the expansion pushes the component to compress the gas in the cavity and discharge it through the air outlet, causing the airbag cover to deform and expand, and the protective component to expand together, and then fit with the inner wall of the steel pipe to achieve sealing. When cooling water is sprayed to the cutting area at high frequency, the sealing structure fully exerts its barrier effect: it ensures that the coolant circulates in the boring area, continuously takes away the high heat generated by the friction between the tool and the workpiece, and ensures efficient cooling; it can also block the path of the coolant carrying waste chips to diffuse into the interior of the steel pipe. In the subsequent tool retraction process, the airbag cover cooperates with the protective component to take out the waste chips in the steel pipe, so that the operator does not need to perform additional waste chip cleaning operations, simplifies the operating steps, and reduces the difficulty of operation.

[0020] 2. In the present invention, a supporting device is provided and the extrusion cone ring is driven to move by adjusting the screw, thereby adjusting the position of the push rod to adapt to the inner diameter of the steel pipe. During boring, the push rod contacts the inner wall of the steel pipe, which can provide stable support for the boring process, improve the accuracy and quality of boring, and ensure the processing size accuracy and surface quality of the inner hole of the steel pipe.

[0021] 3. In the present invention, the clamping and positioning device drives the upper clamping block and the lower clamping block to cooperate through the cylinder 5 to achieve firm clamping of the steel pipe. At the same time, the transmission screw controls the positioning block to position the other end of the steel pipe, ensuring the position accuracy of the steel pipe during the boring process, reducing the displacement or shaking of the steel pipe during the processing, thereby further improving the processing quality.

[0022] 4. In the present invention, the elastic protective cover can be disassembled and replaced by screws. At the same time, the elastic protective cover made of nylon composite material has good elasticity and toughness. The thickness is greater than 2mm, which can reduce the possibility of being pierced by waste chips and further improve the protection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the overall structure of a scaffolding steel pipe end inner hole boring device of the present invention;

[0024] Figure 2For the Figure 1 structural schematic diagram at position A in

[0025] Figure 3 a boring device for the inner hole of the end of a scaffolding steel pipe according to the present invention;

[0026] Figure 4 partial structural schematic diagram of a boring device for the inner hole of the end of a scaffolding steel pipe according to the present invention;

[0027] Figure 5 For the Figure 4 structural schematic diagram from another perspective of a boring device for the inner hole of the end of a scaffolding steel pipe according to the present invention;

[0028] Figure 6 cross-sectional structural schematic diagram of an expansion interception mechanism of a boring device for the inner hole of the end of a scaffolding steel pipe according to the present invention;

[0029] Figure 7 For the Figure 6 structural schematic diagram at position B in

[0030] Figure 8 partial exploded structural schematic diagram of an expansion interception mechanism of a boring device for the inner hole of the end of a scaffolding steel pipe according to the present invention;

[0031] Figure 9 cross-sectional structural schematic diagram of a support device of a boring device for the inner hole of the end of a scaffolding steel pipe according to the present invention;

[0032] Figure 10 Cross-sectional structural schematic diagram of a boring component of a boring device for the inner hole of the end of a scaffolding steel pipe according to the present invention.

[0033] In the figure: 1, frame; 2, guide rail; 3, machine base; 4, main shaft; 5, drive motor; 6, cylinder one; 7, expansion interception mechanism; 71, main rod; 72, cylinder two; 73, rotating sleeve; 74, protection component; 741, elastic protective sleeve; 742, screw; 743, screw hole; 75, expansion pushing part; 751, cylinder three; 752, cylinder four; 753, sealing plug ring; 76, cavity; 77, air outlet; 78, airbag cover; 8, support device; 81, connecting sleeve; 82, adjusting screw; 83, ejector rod; 831, rod body; 832, ball; 84, return spring; 85, extrusion cone ring; 9, clamping and positioning device; 91, bracket; 92, lower clamping block; 93, upper clamping block; 94, cylinder five; 95, stabilizing rod; 96, fixed block; 97, positioning block; 98, transmission screw; 10, boring component; 101, mounting ring; 102, tool holder; 103, tool body; 104, fine adjustment screw; 105, operating head. Detailed implementation mode

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0035] Refer to Figure 1 - Figure 10 A boring device for the inner hole of the end of a scaffolding steel pipe shown in the figure, which includes a frame 1. Two guide rails 2 are installed on the surface of the frame 1, and a machine base 3 is slidably connected to the surface. A main shaft 4 is rotatably connected to the inner wall of the machine base 3. A driving motor 5 is installed above the machine base 3. Synchronous pulleys are installed on both the driving motor 5 and the main shaft 4, and the two synchronous pulleys are connected by a synchronous belt. Two cylinders 6 are installed on the surface of the frame 1, and the output end of the cylinder 6 is fixedly connected to the surface of the machine base 3.

[0036] Among them, an expansion interception mechanism 7 is arranged inside the main shaft 4. The expansion interception mechanism 7 includes a rotating sleeve 73 rotatably connected to the inner wall of the main shaft 4. A main rod 71 is slidably connected to the inner wall of the rotating sleeve 73. A cavity 76 is arranged inside the main rod 71. A plurality of air outlets 77 are formed on the surface of the main rod 71. An airbag cover 78 is fixedly connected to the surface of the main rod 71 near the air outlet 77, forming a sealed state with the cavity 76. A protection component 74 for protecting the airbag cover 78 is arranged on the surface of the main rod 71. The protection component 74 includes an elastic protection sleeve 741 sleeved on the surface of the main rod 71. A plurality of groups of screws 742 are inserted into the inner wall of the elastic protection sleeve 741. A plurality of groups of screw holes 743 are formed on the surface of the main rod 71. The screws 742 are threadedly connected to the inner wall of the screw holes 743. The elastic protection sleeve 741 is made of nylon composite material, and its thickness is greater than 2 mm. An expansion pushing part 75 is arranged inside the main rod 71. The expansion pushing part 75 includes a cylinder 751 fixed inside the inner wall of the main rod 71. The output end of the cylinder 751 extends into the cavity 76 and is fixedly connected to a cylinder 752. The output end of the cylinder 752 is fixedly connected to a sealing plug ring 753. The sealing plug ring 753 is slidably connected to the inner wall of the cavity 76. Two cylinders 72 are fixedly connected to the surface of the machine base 3, and the output ends of the cylinders 72 are fixedly connected to the surface of the main rod 71.

[0037] In this embodiment: The cylinder three 751 can drive the cylinder four 752 and the sealing plug ring 753 to move, thereby compressing the air in the cavity 76 and discharging it from the air outlet 77, causing the airbag cover 78 and the elastic protective sleeve 741 to expand, so as to fit against the inner wall of the steel pipe, realizing the sealing treatment, reducing the further diffusion and movement of the cooling water carrying impurities into the steel pipe. At the same time, the cylinder four 752 can further drive the sealing plug ring 753 to move to increase the expansion size. During the subsequent tool withdrawal process, the airbag cover 78 can cooperate with the elastic protective sleeve 741 to take out the chips in the steel pipe. This sealing structure fully exerts its barrier effect: it not only ensures that the coolant circulates at the boring position, continuously taking away the high heat generated by the friction between the tool and the workpiece to ensure efficient cooling, but also blocks the path of the coolant carrying chips from diffusing into the steel pipe. During the subsequent tool withdrawal process, it can also take out the chips in the steel pipe together.

[0038] Among them, one end of the main rod 71 is provided with a support device 8. The support device 8 includes a connecting sleeve 81 threadedly connected to the inner wall of the rod body 831. The inner wall of the connecting sleeve 81 is slidably connected with multiple sets of ejector rods 83. A return spring 84 is arranged between the multiple sets of ejector rods 83 and the inner wall of the connecting sleeve 81. The return spring 84 is sleeved on the surface of the ejector rod 83, and both ends of the return spring 84 are fixedly connected to the ejector rod 83 and the inner wall of the connecting sleeve 81 respectively. The inner wall of the connecting sleeve 81 is slidably connected with an extrusion cone ring 85. The inner wall of the connecting sleeve 81 is rotatably connected with an adjusting screw rod 82. The adjusting screw rod 82 is threadedly connected to the inner wall of the extrusion cone ring 85. The ejector rod 83 includes a rod body 831 and a ball 832. The ball 832 is arranged in the inner wall of the rod body 831.

[0039] In this embodiment: Before boring, the adjusting screw rod 82 can be rotated. The adjusting screw rod 82 can drive the extrusion cone ring 85 to move. When the extrusion cone ring 85 moves, it can drive multiple sets of ejector rods 83 to move. After adjusting the size to be the same as the inner diameter of the steel pipe, when boring, the multiple ejector rods 83 can contact the inner wall of the steel pipe. After the ejector rods 83 contact the inner wall of the steel pipe, the balls 832 in the ejector rods 83 contact the inner wall. During movement, the balls 832 can reduce the friction force to realize support, thereby improving the overall stability. The return spring 84 can quickly reset the ejector rods 83.

[0040] Among them, a boring component 10 for boring is arranged on the surface of the main shaft 4. The boring component 10 includes a mounting ring 101 installed in the inner wall of the main shaft 4. The inner wall of the mounting ring 101 is slidably connected with two tool seats 102. A tool body 103 is installed in the tool seat 102 through bolts. The inner wall of the mounting ring 101 is rotatably connected with a fine adjustment screw rod 104. The fine adjustment screw rod 104 is threadedly connected to the inner wall of the tool seat 102. One end of the fine adjustment screw rod 104 is fixedly connected with an operation head 105.

[0041] In this embodiment: An adapted tool can be inserted into the operating head 105 in the fine-tuning screw 104, and then the fine-tuning screw 104 is rotated. The fine-tuning screw 104 can control the movement of the tool holder 102 and the tool body 103 to achieve the adjustment operation.

[0042] Among them, two sets of clamping and positioning devices 9 for clamping steel pipes are arranged on the surface of the frame 1. The clamping and positioning device 9 includes a bracket 91 fixed on the inner side of the frame 1. A cylinder five 94 is fixedly connected to the surface of the bracket 91. The output end of the cylinder five 94 is fixedly connected to an upper clamping block 93. A lower clamping block 92 is fixedly connected to the surface of the bracket 91. Two stabilizing rods 95 are fixedly connected to the surface of the upper clamping block 93. The stabilizing rods 95 are slidably connected to the inner wall of the bracket 91. The clamping and positioning device 9 further includes a fixed block 96 fixed on the surface of the frame 1. A positioning block 97 is slidably connected to the inner wall of the fixed block 96. A transmission screw 98 is threadedly connected to the fixed block 96. One end of the transmission screw 98 is rotatably connected to the surface of the positioning block 97.

[0043] In this embodiment: The cylinder five 94 drives the upper clamping block 93 to move. The upper clamping block 93 cooperates with the lower clamping block 92 to clamp and position the scaffolding steel pipe. Through the transmission screw 98, the transmission screw 98 can control the position of the positioning block 97, and the positioning block 97 can fit the other end of the steel pipe for positioning.

[0044] Working principle of the present invention: When boring the inner hole at the end of a scaffolding steel pipe, first, the adjusting screw 82 can be rotated. The adjusting screw 82 can drive the extrusion cone ring 85 to move. When the extrusion cone ring 85 moves, it can drive multiple sets of ejector rods 83 to move. After adjusting the size to be the same as the inner diameter of the steel pipe, then insert a suitable tool into the operating head 105 in the fine-adjusting screw 104. Subsequently, rotate the fine-adjusting screw 104, and the fine-adjusting screw 104 can control the tool holder 102 and the tool body 103 to move. After adjusting the size before boring, place the steel pipe on the two lower clamping blocks 92, with one end fitting against the positioning block 97 to achieve preliminary positioning. Then, open the fifth cylinder 94, and the fifth cylinder 94 can drive the upper clamping block 93 to move. The upper clamping block 93 cooperates with the lower clamping blocks 92 to clamp the steel pipe. When boring, first, the first cylinder 6 drives the entire machine base 3 to move, making the tool body 103 approach the steel pipe. At this time, the support device 8 and the airbag cover 78 have been inserted into the steel pipe. Then, open the second cylinder 72, and the second cylinder 72 drives the main rod 71 and the support device 8 to move. Since the support device 8 is adjusted, the ejector rod 83 can contact the inner wall of the steel pipe, and the ball 832 in the ejector rod 83 contacts the inner wall. When moving, the ball 832 can reduce the friction force, and then support can be achieved. When the airbag cover 78 moves to the non-boring area, open the third cylinder 751. The third cylinder 751 can drive the fourth cylinder 752 and the sealing plug ring 753 to move, thereby compressing the air in the cavity 76 and discharging it from the air outlet 77, causing the airbag cover 78 and the elastic protective sleeve 741 to expand and fit against the inner wall of the steel pipe to achieve sealing. Subsequently, the drive motor 5 controls the main shaft 4 and the tool body 103 to rotate, and the main rod 71 remains stationary to achieve the boring operation. During the boring process, cooling water needs to be sprayed (the spraying mechanism is a prior art and not shown in the figure). During the sealing process, when reducing the subsequent spraying of cooling water, it can prevent the cooling water from carrying impurities and further diffusing and moving into the steel pipe. At the same time, the fourth cylinder 752 can further drive the sealing plug ring 753 to move to increase the expansion size. When the boring is completed, the first cylinder 6 drives the machine base 3 to reset, and the second cylinder 72 drives the rod body 831 to reset. At this time, the airbag cover 78 cooperates with the elastic protective sleeve 741 to carry out the waste chips in the steel pipe. After being carried out, the third cylinder 751 and the fourth cylinder 752 reset, and the airbag cover 78 and the elastic protective sleeve 741 return to their original states, eliminating the need for subsequent secondary cleaning.

[0045] All the electrical components mentioned in this article are connected to an external main controller and 220V mains power supply, and the main controller can be a conventional known device such as a computer for control.

[0046] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An internal hole boring device for the end of a scaffolding steel pipe, comprising a frame (1), on the surface of the frame (1) there are two guide rails (2) installed, and a machine base (3) is slidably connected to the surface, the inner wall of the machine base (3) is rotatably connected to a main shaft (4), above the machine base (3) there is a driving motor (5) installed, synchronous wheels are installed on both the driving motor (5) and the main shaft (4), and the two synchronous wheels are connected by a synchronous belt in transmission, on the surface of the frame (1) there are two first cylinders (6) installed, and the output end of the first cylinder (6) is fixedly connected to the surface of the machine base (3), characterized in that: A boring component (10) for boring is provided on the surface of the main shaft (4), two clamping and positioning devices (9) are provided on the surface of the frame (1), and an expansion interception mechanism (7) is provided on the inner wall of the main shaft (4); The expansion interception mechanism (7) includes a rotating sleeve (73) rotatably connected to the inner wall of the main shaft (4). A main rod (71) is slidably connected to the inner wall of the rotating sleeve (73). A cavity (76) is provided in the inner wall of the main rod (71). A plurality of air outlets (77) are provided on the surface of the main rod (71). An airbag cover (78) is fixedly connected to the surface of the main rod (71) near the air outlets (77), forming a sealed state with the cavity (76). A protection component (74) for protecting the airbag cover (78) is provided on the surface of the main rod (71). An expansion pushing part (75) is provided in the inner wall of the main rod (71). A support device (8) is provided at one end of the main rod (71). Two cylinders II (72) are fixedly connected to the surface of the machine base (3), and the output end of the cylinder II (72) is fixedly connected to the surface of the main rod (71); The support device (8) includes a connecting sleeve (81) threadedly connected to the inner wall of the rod body (831). A plurality of ejector rods (83) are slidably connected to the inner wall of the connecting sleeve (81). A return spring (84) is provided between the plurality of ejector rods (83) and the inner wall of the connecting sleeve (81). An extrusion cone ring (85) is slidably connected to the inner wall of the connecting sleeve (81). An adjusting screw (82) is rotatably connected to the inner wall of the connecting sleeve (81), and the adjusting screw (82) is threadedly connected to the inner wall of the extrusion cone ring (85); The boring component (10) includes a mounting ring (101) installed in the inner wall of the main shaft (4). Two tool holders (102) are slidably connected to the inner wall of the mounting ring (101). A tool body (103) is installed in the tool holder (102) by bolts. A fine adjustment screw (104) is rotatably connected to the inner wall of the mounting ring (101), and the fine adjustment screw (104) is threadedly connected to the inner wall of the tool holder (102). An operating head (105) is fixedly connected to one end of the fine adjustment screw (104).

2. The boring device for the inner hole at the end of a scaffolding steel pipe according to claim 1, characterized in that: The protection component (74) includes an elastic protection sleeve (741) sleeved on the surface of the main rod (71). A plurality of screws (742) are inserted into the inner wall of the elastic protection sleeve (741). A plurality of screw holes (743) are provided on the surface of the main rod (71), and the screws (742) are threadedly connected to the inner walls of the screw holes (743).

3. A boring device for the inner hole of the end of a scaffolding steel pipe according to claim 2, characterized in that: The elastic protection sleeve (741) is made of nylon composite material, and its thickness is greater than 2 mm.

4. A boring device for the inner hole of the end of a scaffolding steel pipe according to claim 1, characterized in that: The expansion pushing part (75) includes a cylinder III (751) fixed in the inner wall of the main rod (71). The output end of the cylinder III (751) extends into the cavity (76) and is fixedly connected to a cylinder IV (752). The output end of the cylinder IV (752) is fixedly connected to a sealing plug ring (753), and the sealing plug ring (753) is slidably connected to the inner wall of the cavity (76).

5. A boring device for the inner hole of the end of a scaffolding steel pipe according to claim 1, characterized in that: The reset spring (84) is sleeved on the surface of the ejector rod (83), and both ends of the reset spring (84) are fixedly connected to the ejector rod (83) and the inner wall of the connecting sleeve (81) respectively.

6. The boring device for the inner hole at the end of a scaffolding steel pipe according to claim 5, characterized in that: The ejector rod (83) includes a rod body (831) and a ball (832), and the ball (832) is arranged in the inner wall of the rod body (831).

7. A boring device for the inner hole of the end of a scaffolding steel pipe according to claim 1, characterized in that: The clamping and positioning device (9) includes a bracket (91) fixed on the inner side of the frame (1). A cylinder five (94) is fixedly connected to the surface of the bracket (91). The output end of the cylinder five (94) is fixedly connected to an upper clamping block (93). A lower clamping block (92) is fixedly connected to the surface of the bracket (91). Two stabilizing rods (95) are fixedly connected to the surface of the upper clamping block (93), and the stabilizing rods (95) are slidably connected to the inner wall of the bracket (91).

8. A boring device for the inner hole of the end of a scaffolding steel pipe according to claim 1, characterized in that: The clamping and positioning device (9) further includes a fixed block (96) fixed on the surface of the frame (1). A positioning block (97) is slidably connected to the inner wall of the fixed block (96). A transmission screw rod (98) is threadedly connected to the fixed block (96), and one end of the transmission screw rod (98) is rotatably connected to the surface of the positioning block (97).

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