An automatic feeding device for square tube cutting

Abstract

This invention relates to the field of tube cutting technology and discloses an automatic feeding device for square tube cutting. The device includes two roller-type square tube limiting mechanisms and a pneumatic drive mechanism. Internally, it comprises turbine blades mounted above a central mounting plate that rotate under gas pressure; a second longitudinal roller that rotates with the turbine blades and drives the square tube; a main gas connection pipe that guides the exhaust gas from the turbine blades into the roller-type square tube limiting mechanisms; and an electromagnetic gas valve that controls the gas flow direction. This automatic feeding device for square tube cutting utilizes gas pressure as a drive source, enabling automatic locking and limiting of the square tube and directional driving of the square tube. This improves power utilization and the automation level of square tube feeding, thereby further enhancing the feeding efficiency.

Description

Technical Field

[0001] This invention relates to the field of tube cutting technology, specifically to an automatic feeding device for square tube cutting. Background Technology

[0002] Square tube is a type of rectangular tubing, meaning a steel pipe with equal side lengths. It is made by rolling strip steel through a process. During the production and processing of square tubes, multiple processing holes need to be punched into one side at a fixed length. In the production and processing of square tubes, they need to be fed quickly. The current feeding method is manual feeding, that is, the operator feeds the square tubes by carrying them. Manual feeding consumes a lot of manpower, greatly increases the labor intensity of the workers, and has low feeding efficiency, thus reducing the processing efficiency of square tubes.

[0003] To this end, Chinese Patent No. CN219188824U discloses an "Automatic Feeding Device for Square Tube Cutting". Its main structure includes a storage rack and a processing rack. The square tube is placed on the storage rack, and the storage rack and processing rack are fixedly connected. The storage rack is provided with a first driving component, and the processing rack is provided with a second driving component. Both the first and second driving components abut against the square tube. The first driving component moves toward the processing rack, and the control movement directions of the first and second driving components are perpendicular. The automatic feeding device for square tube cutting uses a fixed groove to limit the square tube. When the lifting roller rises to abut against the square tube, the square tube is embedded in the fixed groove, reducing the possibility of the square tube falling off the lifting roller.

[0004] However, in the actual cutting process of square tubes, it is necessary to move the square tubes to a certain length directly below the cutting head of the hydraulic tube cutter. The aforementioned automatic feeding device for square tube cutting is difficult to meet the function of automatically moving the square tubes. At the same time, manual operation is still required when the square tubes are embedded in the fixed groove. Therefore, the automation level of this automatic feeding device for square tube cutting is relatively low, resulting in a low feeding efficiency. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an automatic feeding device for square tube cutting. Utilizing gas pressure as a driving source, it can achieve automatic locking and limiting functions for square tubes, as well as directional driving functions. This improves power utilization and the automation level of square tube feeding, thereby further enhancing the feeding efficiency of square tubes and solving the aforementioned technical problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an automatic feeding device for square tube cutting, comprising a hydraulic tube cutter installed above a working substrate and capable of cutting square tubes, a vertical frame fixedly installed above one side of the working substrate, a central mounting plate disposed at the center of the horizontal structure of the vertical frame with a hollow center, and two fixed tube sleeves disposed in the longitudinal structure of the vertical frame, and further comprising two roller-type square tube limiting mechanisms, each having a horizontal hollow roller capable of supporting and rotating the square tube, a first longitudinal roller located above the horizontal hollow roller and capable of rotation, and a gas pressure... Below, there is a piston body that can move the first longitudinal roller away from the longitudinal symmetry plane of the horizontal hollow roller, and a first helical spring that generates elastic pressure on the piston body and moves the first longitudinal roller closer to the longitudinal symmetry plane of the horizontal hollow roller; and a pneumatic drive mechanism, which is equipped with a turbine fan blade mounted above the central mounting plate and rotating after being acted upon by gas, a second longitudinal roller that can rotate with the turbine fan blade and drive the square tube, a main gas connection pipe that can guide the exhaust portion of the gas driving the turbine fan blade into the roller-type square tube limiting mechanism, and an electromagnetic gas valve that can control the direction of gas flow.

[0007] Preferably, the roller-type square tube limiting mechanism includes a horizontal hollow outer shell. The shell of the horizontal hollow outer shell is mounted at the center of the horizontal hollow roller via a bearing. One end of the horizontal hollow outer shell is provided with a hollow pipe body fixedly installed inside a fixed sleeve. The interior of the horizontal hollow outer shell is provided with a horizontal component movable cavity. The interior of the hollow pipe body is provided with a first gas flow hole connecting the external space and one end of the horizontal component movable cavity. The other end of the hollow pipe body is provided with a rod through hole connecting the external space and the other end of the horizontal component movable cavity. A piston body capable of moving axially along the horizontal component movable cavity is placed inside the horizontal hollow outer shell. A curved movable rod passing through the rod through hole is fixedly installed at one end of the piston body. A first helical spring in a compressed state is sleeved around the rod body inside the horizontal component movable cavity. The top end of the curved movable rod extends above the horizontal hollow roller, and a first longitudinal roller capable of rotation is mounted on the exterior of the longitudinal structure via a bearing.

[0008] Preferably, the structural shape of the perforated cross section of the rod is consistent with the structural shape of the cross section of the curved movable rod, both being polygonal structures, and the structural dimensions of the perforated cross section of the rod match the structural dimensions of the cross section of the curved movable rod.

[0009] Preferably, when the piston body causes the first helical spring to be fully compressed, the extension line of the axis of the first longitudinal roller can still intersect perpendicularly with the axis of the horizontal hollow roller.

[0010] Preferably, the pneumatic drive mechanism includes a turbine mounting housing and a first longitudinal hollow housing. The turbine mounting housing has a turbine mounting cavity inside. The bottom end of the turbine mounting housing has a second docking channel connecting to the center of the bottom end of the turbine mounting cavity and fixedly mounted on the upper surface of the central mounting plate. The top end of the turbine mounting housing has a first docking channel connecting to the center of the top end of the turbine mounting cavity. The first longitudinal hollow housing has a gas flow cavity with an open top, connecting to a hollow structure at the center of the central mounting plate. The top end of the first longitudinal hollow housing is fixedly mounted on the lower surface of the central mounting plate via a third docking channel. The bottom center of the first longitudinal hollow housing has a shaft mounting... The first longitudinal hollow outer shell has a main gas connection pipe on its side that connects to the side of the gas flow cavity. The middle area of ​​the main gas connection pipe is connected to two first gas flow holes through branch gas connection pipes. An electromagnetic gas valve is fixedly installed inside one end of the main gas connection pipe. A rotatable central shaft is installed inside the first docking channel and the second docking channel through a hollow mounting bracket and bearing. A turbine blade is fixedly installed on the outside of the shaft body located inside the turbine mounting cavity. The bottom shaft body of the central shaft passes through the shaft body mounting hole and a second longitudinal roller is fixedly installed at the bottom end. A gas injection channel connecting the turbine mounting cavity is provided on the outer circumferential side of the turbine mounting outer shell.

[0011] Preferably, after the equipment is installed, the driving effect of the second longitudinal roller on the square tube is sufficient to allow the square tube to be inserted into the cutting port of the hydraulic pipe cutter.

[0012] Preferably, it also includes a pressure relief gas sealing mechanism, which has a second longitudinal hollow shell fixedly installed at the top of the first docking channel and is hollow inside, an abutment valve plate that can block the discharge port of the waste liquid discharge channel and has the function of moving downward, and a second helical spring that produces a downward elastic damping effect on the abutment valve plate.

[0013] Preferably, the pressure-relief gas sealing mechanism includes a second helical spring. The bottom end of the second longitudinal hollow shell is provided with a fourth docking channel, which is integrally structured with it and fixedly installed at the top of the first docking channel. The center of the bottom end of the second longitudinal hollow shell is provided with a first gas discharge hole that connects to the top port of the first docking channel. The second longitudinal hollow shell is provided with a longitudinal component movable cavity at the top of the first gas discharge hole. The top of the longitudinal component movable cavity is provided with a second gas discharge hole that connects to the external space. Inside the longitudinal component movable cavity, the second longitudinal hollow shell is provided with an abutment valve plate that can move axially along the longitudinal component movable cavity. An annular sealing ring is embedded in the lower end of the abutment valve plate. A second helical spring is installed at the top of the abutment valve plate. The circumferential surface of the abutment valve plate is provided with multiple concave gas flow grooves for liquid flow.

[0014] Preferably, the initial length of the second helical spring is greater than the depth of the movable cavity of the longitudinal component.

[0015] Preferably, the annular closed ring protrudes downward relative to the lower surface of the contact valve plate, and the structural radius of the inner ring of the annular closed ring is greater than the structural radius of the top port of the first gas discharge hole, and the structural radius of the outer ring is less than the distance between the gas flow groove and the axis of the contact valve plate.

[0016] Compared with the prior art, the present invention provides an automatic feeding device for square tube cutting, which has the following advantages:

[0017] By using gas pressure as a driving source, the automatic locking and limiting function and the directional driving function of the square tube can be realized. This improves the power utilization rate and the automation level of square tube feeding, thereby further improving the feeding efficiency of square tubes. Attached Figure Description

[0018] Figure 1 This is a perspective view of the present invention;

[0019] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0020] Figure 3 This is a perspective view of the roller-type square tube limiting mechanism in this invention;

[0021] Figure 4 This is a three-dimensional cross-sectional view of the roller-type square tube limiting mechanism in this invention;

[0022] Figure 5 This is a perspective view of the pneumatic drive mechanism in this invention;

[0023] Figure 6 This is a three-dimensional cross-sectional view of the pneumatic drive mechanism in this invention;

[0024] Figure 7 This is a three-dimensional cross-sectional view of the pressure relief gas sealing mechanism in this invention;

[0025] Figure 8 This is a perspective view of the abutting valve plate in this invention.

[0026] The components include: 1. Working base plate; 2. Hydraulic pipe cutting machine; 3. Vertical frame; 4. Fixed pipe sleeve; 5. Center mounting plate; 6. Pipe cutting end; 7. Roller-type square tube limiting mechanism; 71. Horizontal hollow roller; 72. Horizontal hollow outer shell; 73. Hollow pipe body; 74. Horizontal component movable cavity; 75. Gas flow hole No. 1; 76. Rod perforation; 77. Piston body; 78. Curved movable rod; 79. Helical spring No. 1; 710. Longitudinal roller No. 1; 8. Pneumatic drive mechanism; 81. Turbine mounting shell; 82. Longitudinal hollow outer shell No. 1; 83. Turbine mounting cavity; 84. Docking channel No. 1; 85. Docking channel No. 2. 86. Gas flow chamber; 87. No. 3 docking channel; 88. Shaft mounting hole; 89. Main gas connection pipe; 810. Branch gas connection pipe; 811. Electromagnetic gas valve; 812. Central rotating shaft; 813. Hollow mounting bracket; 814. No. 2 longitudinal roller; 815. Turbine fan blade; 816. Gas injection channel; 9. Pressure relief gas sealing mechanism; 91. No. 2 longitudinal hollow shell; 92. No. 4 docking channel; 93. No. 1 gas discharge hole; 94. Abutment valve plate; 95. Gas flow groove; 96. Annular sealing ring; 97. No. 2 helical spring; 98. No. 2 gas discharge hole; 99. Longitudinal component movable chamber. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1 and Figure 2 An automatic feeding device for cutting square tubes includes a hydraulic tube cutter 2 installed above a working base plate 1 and capable of cutting square tubes, a vertical frame 3 fixedly installed above one side of the working base plate 1, a central mounting plate 5 set at the center of the horizontal structure of the vertical frame 3 with a hollow center, and two fixed tube sleeves 4 set in the longitudinal structure of the vertical frame 3. A gas compressor that generates high-pressure gas is used, and the exhaust port of the gas compressor and the air inlet port of the gas injection channel 816 are connected through a pipe.

[0029] To utilize the gas-pairing tube for delivery and limit locking functions, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 3 and Figure 4 Two roller-type square tube limiting mechanisms 7 are required. Each mechanism contains a horizontal hollow roller 71 that supports the square tube and allows rotation; a first longitudinal roller 710 located above and capable of rotation; a piston 77 that, under gas pressure, moves the first longitudinal roller 710 away from the longitudinal symmetry plane of the horizontal hollow roller 71; and a first helical spring 79 that exerts elastic pressure on the piston 77 and moves the first longitudinal roller 710 closer to the longitudinal symmetry plane of the horizontal hollow roller 71. When gas enters the horizontal component's movable cavity 74 through the branch gas connection pipe 810, the gas pressure causes the piston 77 to move the first longitudinal roller 710 to one side. Simultaneously, the first helical spring 79 is continuously compressed and stores energy. The first longitudinal roller 710 moves away from the second longitudinal roller 814, thus providing a larger area for the square tube to be placed onto the surface of the horizontal hollow roller 71 located between the first longitudinal roller 710 and the second longitudinal roller 814. The square tube is then placed into this area, and the gas in the main gas connection pipe 89 can be directly discharged outward through the electromagnetic gas valve 811. At this time, the gas will be directly discharged outward through the electromagnetic gas valve 811 due to flow resistance, and the stored energy of the first helical spring 79 will release its elastic potential energy, thereby causing the piston body 77 to drive the first longitudinal roller 710 to move to the other side. Finally, the square tube is clamped between the first longitudinal roller 710 and the second longitudinal roller 814, thus using gas to place and limit the locking function of the square tube.

[0030] For details regarding the specific structure of the roller-type square tube limiting mechanism 7, please refer to [link / reference needed]. Figure 3 and Figure 4The system includes a horizontal hollow outer shell 72, the shell of which is mounted at the center of the horizontal hollow roller 71 via bearings. One end of the horizontal hollow outer shell 72 has a hollow pipe body 73 fixedly installed inside the fixed sleeve 4. The interior of the horizontal hollow outer shell 72 has a horizontal component movable cavity 74. The interior of the hollow pipe body 73 has a first gas flow hole 75 connecting the external space and one end of the horizontal component movable cavity 74. The other end of the hollow pipe body 73 has a rod through hole 76 connecting the external space and the other end of the horizontal component movable cavity 74. Inside the horizontal component movable cavity 74, the horizontal hollow outer shell 72 houses a piston body 77 capable of axial movement along the horizontal component movable cavity 74. One end of the piston body 77 is fixedly mounted with… A curved movable rod 78 passes through the through-hole 76 of the rod body. A first helical spring 79 in a compressed state is placed around the rod body inside the movable cavity 74 of the horizontal component. The top of the curved movable rod 78 extends above the horizontal hollow roller 71, and a first longitudinal roller 710 that can rotate is installed on the outside of the longitudinal structure through a bearing. The cross-sectional shape of the rod body through-hole 76 is consistent with the cross-sectional shape of the curved movable rod 78. Both are polygonal structures, and the structural dimensions of the cross-section of the rod body through-hole 76 match the structural dimensions of the cross-section of the curved movable rod 78. The piston body 77 ensures that when the first helical spring 79 is fully compressed, the extension line of the axis of the first longitudinal roller 710 can still intersect perpendicularly with the axis of the horizontal hollow roller 71.

[0031] To convert the kinetic energy of a gas into mechanical kinetic energy, please refer to [link / reference]. Figure 1 , Figure 2 , Figure 5 and Figure 6A pneumatic drive mechanism 8 is required, which includes a turbine blade 815 mounted above the central mounting plate 5 and rotating under gas pressure; a second longitudinal roller 814 that rotates with the turbine blade 815 and drives the square tube; a main gas connection pipe 89 that guides the gas tail of the turbine blade 815 into the roller-type square tube limiting mechanism 7; and an electromagnetic gas valve 811 that controls the gas flow direction. The gas compressor is started, and high-pressure gas enters the turbine mounting cavity 83 through the gas injection channel 816 and flows towards the edge of the turbine blade 815. The gas flows through the edge, driving the turbine blades 815 to rotate. The turbine blades 815 then drive the second longitudinal roller 814 to rotate. The rotation of the second longitudinal roller 814 drives the square tube. At the same time, the gas flow eventually concentrates inside the main gas connection pipe 89. When the electromagnetic gas valve 811 is opened, the gas can be directly discharged to the outside through the electromagnetic gas valve 811. When the electromagnetic gas valve 811 is closed, the gas flows into the branch gas connection pipe 810, thereby driving the roller-type square tube limiting mechanism 7 and converting the kinetic energy of the gas into mechanical kinetic energy.

[0032] For details regarding the specific structure of the pneumatic drive mechanism 8, please refer to [link / reference]. Figure 5 and Figure 6The system includes a turbine mounting housing 81 and a first longitudinal hollow housing 82. The turbine mounting housing 81 has a turbine mounting cavity 83 inside. The bottom end of the turbine mounting housing 81 has a second docking channel 85 connecting to the center of the bottom end of the turbine mounting cavity 83 and fixedly mounted on the upper surface of the central mounting plate 5. The top end of the turbine mounting housing 81 has a first docking channel 84 connecting to the center of the top end of the turbine mounting cavity 83. The first longitudinal hollow housing 82 has a gas flow cavity 86 with an open top, connecting to a hollow structure at the center of the central mounting plate 5. The top end of the first longitudinal hollow housing 82 is fixedly mounted on the lower surface of the central mounting plate 5 via a third docking channel 87. The bottom center of the first longitudinal hollow housing 82 has a shaft mounting hole 88. The side of the first longitudinal hollow housing 82 has a main gas connection pipe connecting to the side of the gas flow cavity 86. 89. The middle region of the main gas connection pipe 89 is connected to two gas flow holes 75 via branch gas connection pipes 810. An electromagnetic gas valve 811 is fixedly installed inside one end of the main gas connection pipe 89. A rotatable central shaft 812 is installed inside the first docking channel 84 and the second docking channel 85 via a hollow mounting bracket 813 and bearings. A turbine blade 815 is fixedly installed on the outside of the shaft body located inside the turbine mounting cavity 83. The bottom shaft body of the central shaft 812 passes through the shaft mounting hole 88 and a second longitudinal roller 814 is fixedly installed at the bottom end. A gas injection channel 816 connecting the turbine mounting cavity 83 is provided on the outer circumferential side of the turbine mounting housing 81. After the equipment is installed, the driving effect of the second longitudinal roller 814 on the square tube is sufficient to insert the square tube into the cutting port 6 of the hydraulic pipe cutter 2.

[0033] To ensure timely discharge of excess gas when the gas drives the piston 77, please refer to [link / reference needed]. Figure 1 , Figure 2 , Figure 7 and Figure 8A pressure-relief gas sealing mechanism 9 needs to be installed. Inside, there is a second longitudinal hollow shell 91, fixedly installed at the top of the first docking channel 84 and hollow inside; a contact valve plate 94 capable of blocking the discharge port of the waste liquid discharge channel 88 and having a downward movement function; and a second helical spring 97 that provides downward elastic damping to the contact valve plate 94. Initially, due to the elastic resistance of the second helical spring 97, the gas in the turbine mounting cavity 83 can only flow into the second docking channel 85 and the gas flow cavity 86. Once the electromagnetic gas valve 811 is closed, the gas flows through the branch... After the gas connecting pipe 810 enters the horizontal component's movable chamber 74, under the action of air pressure, the piston body 77 will drive the first longitudinal roller 710 to move to one side. At this time, the first helical spring 79 is continuously compressed and stores energy. Simultaneously, due to the continuous increase of gas, the air pressure inside the equipment will increase sharply. When the air pressure exceeds the elastic strength of the second helical spring 97, the excess gas will be discharged upward through the gap below the valve plate 94, the gas flow groove 95, and the second gas discharge hole 98. Thus, when the gas drives the piston body 77, the function of timely discharge of excess gas is realized.

[0034] For the specific structure of the pressure relief gas sealing mechanism 9, please refer to [link / reference]. Figure 7 and Figure 8 The system includes a second helical spring 97. The bottom end of the second longitudinal hollow outer shell 91 is provided with a fourth docking channel 92, integrally structured with and fixedly installed at the top of the first docking channel 84. The center of the bottom end of the second longitudinal hollow outer shell 91 is provided with a first gas vent 93 connecting to the top port of the first docking channel 84. The second longitudinal hollow outer shell 91 has a longitudinal component movable cavity 99 located at the top of the first gas vent 93. The top of the longitudinal component movable cavity 99 is provided with a second gas vent 98 connecting to the external space. Inside the longitudinal component movable cavity 99, the second longitudinal hollow outer shell 91 houses a component capable of axial movement along the longitudinal component movable cavity 99. A movable abutment valve plate 94 is provided, with an annular closed ring 96 embedded in the lower end of the abutment valve plate 94. A second helical spring 97 is installed at the top of the abutment valve plate 94. The circumferential surface of the abutment valve plate 94 is provided with multiple concave structures for gas flow grooves 95 for liquid flow. The initial length of the second helical spring 97 is greater than the depth of the longitudinal component movable cavity 99. The annular closed ring 96 protrudes downward relative to the lower surface of the abutment valve plate 94. The structural radius of the inner ring of the annular closed ring 96 is greater than the structural radius of the top port of the first gas discharge hole 93, and the structural radius of the outer ring is less than the distance between the gas flow grooves 95 and the axis of the abutment valve plate 94.

[0035] In use, a gas compressor that generates high-pressure gas is used. The exhaust port of the gas compressor and the inlet port of the gas injection channel 816 are connected through a pipe. The gas compressor is started, and the high-pressure gas enters the turbine mounting cavity 83 through the gas injection channel 816 and flows towards the edge of the turbine blade 815, thereby driving the turbine blade 815 to rotate. Driving the turbine blade 815 directly drives the second longitudinal roller 814 to rotate. The rotation of the second longitudinal roller 814 achieves the driving effect on the opposite pipe. At the same time, the gas flow will eventually concentrate inside the main gas connection pipe 89. When the solenoid gas valve 811 is closed, the gas will flow into the branch gas connection pipe 810. When the gas enters the horizontal component moving cavity 74 through the branch gas connection pipe 810, under the action of air pressure, the piston body 77 will drive the first longitudinal roller 710 to move to one side. At this time, the first helical spring 79 is continuously compressed and stores energy. At this time, the first longitudinal roller 710 will move away from the second longitudinal roller 81. 4. This provides a larger area for the square tube to be placed onto the surface of the horizontal hollow roller 71 located between the first longitudinal roller 710 and the second longitudinal roller 814. The square tube is then placed into this area, and the gas in the main gas connection pipe 89 is directly discharged outwards via the electromagnetic gas valve 811. At this time, the gas will be directly discharged outwards through the electromagnetic gas valve 811 due to flow resistance, and the stored energy of the first helical spring 79 will release its elastic potential energy, thereby causing the piston 77 to drive the first... The longitudinal roller 710 moves to the other side, eventually clamping the square tube between the first longitudinal roller 710 and the second longitudinal roller 814. At this time, the electromagnetic gas valve 811 is opened, and the gas can be directly discharged to the outside through the electromagnetic gas valve 811. The turbine fan blade 815 drives the second longitudinal roller 814 to rotate. The rotation of the second longitudinal roller 814 can achieve the driving effect of the square tube, thereby sending the square tube into the tube cutting port 6. Then, the hydraulic tube cutting machine 2 is started to cut the square tube.

[0036] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An automatic feeding device for square tube cutting, comprising a hydraulic tube cutter installed above a working base plate and capable of cutting square tubes, a vertical frame fixedly installed above one side of the working base plate, a central mounting plate disposed at the center of the horizontal structure of the vertical frame and having a hollow center, and two fixed tube sleeves disposed in the longitudinal structure of the vertical frame, characterized in that: It also includes, Two roller-type square tube limiting mechanisms are provided inside, including a horizontal hollow roller that can support the square tube and rotate, a first longitudinal roller that is located above the horizontal hollow roller and can rotate, a piston that can move the first longitudinal roller away from the longitudinal symmetry plane of the horizontal hollow roller under gas pressure, and a first helical spring that generates elastic pressure on the piston and moves the first longitudinal roller closer to the longitudinal symmetry plane of the horizontal hollow roller. And a pneumatic drive mechanism, which is equipped with a turbine fan blade installed above the central mounting plate and rotating when subjected to gas, a second longitudinal roller that can rotate with the turbine fan blade and drive the square tube, a main gas connection pipe that can guide the exhaust portion of the gas driving the turbine fan blade into the roller-type square tube limiting mechanism, and an electromagnetic gas valve that can control the direction of gas flow. The roller-type square tube limiting mechanism includes a horizontal hollow shell. The shell of the horizontal hollow shell is mounted at the center of the horizontal hollow roller via bearings. One end of the horizontal hollow shell is provided with a hollow pipe body fixedly installed inside the fixed sleeve. The interior of the horizontal hollow shell is provided with a horizontal component movable cavity. The interior of the hollow pipe body is provided with a first gas flow hole connecting the external space and one end of the horizontal component movable cavity. The other end of the hollow pipe body is provided with a rod through hole connecting the external space and the other end of the horizontal component movable cavity. Inside the horizontal hollow shell, a piston body capable of moving axially along the horizontal component movable cavity is placed. One end of the piston body is fixedly installed with a curved movable rod passing through the rod through hole. A first helical spring in a compressed state is placed around the rod body inside the horizontal component movable cavity. The top of the curved movable rod extends above the horizontal hollow roller, and a first longitudinal roller capable of rotation is mounted on the outside of the longitudinal structure via bearings. The pneumatic drive mechanism includes a turbine mounting housing and a first longitudinal hollow housing. The turbine mounting housing contains a turbine mounting cavity. The bottom of the turbine mounting housing has a second docking channel connecting to the center of the bottom of the turbine mounting cavity and fixedly mounted on the upper surface of the central mounting plate. The top of the turbine mounting housing has a first docking channel connecting to the center of the top of the turbine mounting cavity. The first longitudinal hollow housing contains a gas flow cavity with an open top, connecting to a hollow structure at the center of the central mounting plate. The top of the first longitudinal hollow housing is fixedly mounted on the lower surface of the central mounting plate via a third docking channel. The bottom center of the first longitudinal hollow housing has a shaft mounting hole. The side of the first longitudinal hollow shell is provided with a main gas connection pipe that connects to the side of the gas flow cavity. The middle area of ​​the main gas connection pipe is connected to two first gas flow holes through a branch gas connection pipe. An electromagnetic gas valve is fixedly installed inside one end of the main gas connection pipe. The first docking channel and the second docking channel are equipped with a rotating central shaft through a hollow mounting bracket and bearing. The central shaft is fixedly installed with a turbine fan blade outside the shaft body located inside the turbine mounting cavity. The bottom shaft body of the central shaft passes through the shaft body mounting hole and the bottom end is fixedly installed with a second longitudinal roller. The outer circumferential side of the turbine mounting shell is provided with a gas injection channel that connects to the turbine mounting cavity. It also includes a pressure relief gas sealing mechanism, which has a second longitudinal hollow shell fixedly installed at the top of the first docking channel and is hollow inside, an abutment valve plate that can block the discharge port of the waste liquid discharge channel and has the function of moving downward, and a second helical spring that produces a downward elastic damping effect on the abutment valve plate.

2. The automatic feeding device for square tube cutting according to claim 1, characterized in that: The structural shape of the perforated cross section of the rod is consistent with that of the curved movable rod cross section; both are polygonal structures, and the structural dimensions of the perforated cross section of the rod match those of the curved movable rod cross section.

3. An automatic feeding device for square tube cutting according to claim 2, characterized in that: When the piston body fully compresses the first helical spring, the extension line of the axis of the first longitudinal roller can still intersect perpendicularly with the axis of the horizontal hollow roller.

4. An automatic feeding device for square tube cutting according to claim 3, characterized in that: The bottom end of the second longitudinal hollow shell is provided with a fourth docking channel, which is integrally structured with it and fixedly installed at the top of the first docking channel. The bottom center of the second longitudinal hollow shell is provided with a first gas vent hole that connects to the top port of the first docking channel. The second longitudinal hollow shell is provided with a longitudinal component movable cavity at the top of the first gas vent hole. The top of the longitudinal component movable cavity is provided with a second gas vent hole that connects to the external space. Inside the longitudinal component movable cavity, the second longitudinal hollow shell is provided with an abutment valve plate that can move axially along the longitudinal component movable cavity. An annular closed ring is embedded in the lower end of the abutment valve plate. A second helical spring is installed at the top of the abutment valve plate. The circumferential surface of the abutment valve plate is provided with multiple concave structures for gas flow grooves for liquid flow.

5. An automatic feeding device for square tube cutting according to claim 4, characterized in that: The initial length of the No. 2 helical spring is greater than the depth of the moving cavity of the longitudinal component.

6. An automatic feeding device for square tube cutting according to claim 5, characterized in that: The annular closed ring protrudes downward relative to the lower surface of the contact valve plate, and the structural radius of the inner ring of the annular closed ring is greater than the structural radius of the top port of the first gas discharge hole, while the structural radius of the outer ring is less than the distance between the gas flow groove and the axis of the contact valve plate.

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