Double-column band saw machine for angle steel tower machining

Abstract

The application relates to the technical field of angle steel tower processing, and provides a double-column band sawing machine for angle steel tower processing, which comprises a workbench and a stand column; a clamping seat is arranged on the top of the workbench; a rack is arranged on the top of the stand column; a right support is arranged on one side of one end of the rack; a left support is symmetrically arranged on one side of the right support; leveling structures are arranged on the bottoms of the right support and the left support. When the band sawing machine is laterally deviated, the rear roller is pressed, the corresponding side cam is driven to rotate through the connecting rod, the rear roller on the side is pressed inward to press the band sawing machine on one side, the teeth on the rear end of the cam and the air bag push the rack on the other side to make the cam on the other side rotate synchronously, the rear roller on the other side is synchronously pressed, the defects of traditional fixed gap guiding, such as overheating or insufficient clamping swing, are avoided, the sawing seam deviation and the roughness of the cut are effectively inhibited, and the size precision and the section quality of the angle steel fixed-length sawing and beveling are improved.

Description

Technical Field

[0001] This invention relates to the field of angle steel tower processing technology, and in particular to a double-column band saw for processing angle steel towers. Background Technology

[0002] Angle steel towers are space truss structures made of hot-rolled equal or unequal angle steel connected by bolts or welding. They are widely used in power transmission lines, communication base stations, microwave towers, and other fields. During the manufacturing process, long strips of angle steel need to be cut to a certain length according to the design dimensions and the ends beveled for subsequent assembly. This is a type of metal cutting, and currently, angle steel tower processing companies generally use double-column band saws as the main equipment for cutting angle steel. Traditional band saws for processing angle steel towers operate with L-shaped cross-sections of angle steel, typically using multiple angle steels clamped side-by-side for sawing. Due to the asymmetrical thickness distribution of the flanges and webs of the angle steel, the cutting resistance experienced by the saw blade on both sides differs significantly when it cuts into the angle steel: one side cuts into the root of the flange where the material is thicker, while the other side cuts into the end of the flange or web where the material is thinner. This asymmetrical cutting force generates a significant deflection moment in the width direction of the saw blade, forcing the saw blade to sway towards the side with less resistance. This swaying causes the kerf trajectory to bend and the cut smoothness to decrease. Especially under conditions of large thickness and high feed, the swaying amplitude of the saw blade increases, severely affecting the fixed length accuracy and the bevel angle. Summary of the Invention

[0003] The purpose of this invention is to provide a double-column band saw for processing angle steel towers, in order to solve the defect of uneven force distribution on the saw band in existing double-column band saws for processing angle steel towers.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a double-column band saw for processing angle steel towers, comprising a worktable and columns; a clamping seat is installed on the top of the worktable, a frame is installed on the top of the column, and a right support is provided on one side of one end of the frame; a left support is symmetrically arranged on one side of the right support, and a leveling structure is installed at the bottom of both the right and left supports, and an elastic arm is provided on the inner side of each leveling structure; the leveling structure includes a support plate fixed to the outer side of the bottom of the left and right supports, and a front roller is installed at the front end of each support plate, a rear roller is provided at both the front and rear ends of each front roller, and a cam is installed at the rear end of each rear roller.

[0005] Preferably, saw wheels are installed on both sides of the frame, and a cover is provided on the outer side of each saw wheel. An adjusting rod is provided at the middle position of the frame, and a sliding structure is formed between the right support, the left support, and the adjusting rod. A saw blade is sleeved on the outside of each saw wheel.

[0006] Preferably, push blocks are installed inside both the right and left brackets, and a lead screw is provided at the bottom of each push block, with the lead screw and push block being threaded together.

[0007] Preferably, each lead screw is equipped with a handle at its outer end, each push block is provided with a locking block on its inner side, and the contact area between the locking block and the push block is at an angle. Each locking block and the right and left supports form a sliding structure.

[0008] Preferably, the corresponding positions of the two sets of rear rollers and cams are designed to be the same, the rear end of the cam at the bottom of the left bracket is equipped with a left rack, and the rear end of the cam at the bottom of the right bracket is equipped with a right rack.

[0009] Preferably, each of the rear rollers is equipped with a connecting shaft at its top end, and the connecting shaft and the support plate form a sliding structure. Each of the connecting shafts is provided with a connecting block at its rear end, and each of the connecting shafts is equipped with a connecting rod at its top end.

[0010] Preferably, each of the cams has a connecting plate mounted on its top end, and the connecting plate and the connecting rod are hinged together. Each of the cams has teeth on its outer end, and the teeth are meshed with the left rack and the right rack.

[0011] Preferably, a left airbag is provided on the inner side of the left rack, and a left air chamber is installed on the inner side of the left airbag, and a left spring is sleeved on the outside of the left airbag.

[0012] Preferably, a right airbag is installed on the inner side of the right rack, and a right air chamber is provided on the inner side of the right airbag. A right spring is installed between the right airbag and the right rack, and a hose is connected between the right air chamber and the left air chamber.

[0013] Preferably, the elastic arm is arched, and guide blocks are installed on the inner side of the elastic arm. Movable blocks are provided at the top and bottom of the guide blocks, and a movable groove is installed at one end of the guide block inside the movable block. The cross-section of the elastic arm is I-shaped.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the double column band saw for processing angle steel towers uses a leveling structure to dynamically adjust the clamping force of the saw band according to the sway force through cam and pneumatic linkage, thereby suppressing sway; the elastic arm provides restoring torque and dissipates torsional vibration energy with I-section and arch structure, attenuating torsion and extending the life of the saw band. 1. With the leveling structure, when the saw band sways laterally due to the asymmetrical cutting force of the L-shaped section of the angle steel, the rear roller on the swaying side is subjected to lateral pressure. This pressure is transmitted to the cam on the corresponding side through the connecting rod and connecting plate, driving the cam to rotate around its axis. The convex part of the cam directly presses the connecting block connected to the rear roller on that side, pushing the rear roller to move towards the saw band, thereby applying an initial clamping force to the saw band on that side. The cam direct push method can instantly convert the swaying tendency of the saw band into a clamping action, quickly suppressing the further expansion of the sway. Furthermore, the compressed gas in the sway side airbag is quickly transmitted to the opposite airbag through the hose, pushing the opposite rack to move in the same direction, driving the opposite cam to rotate synchronously, and thus causing the opposite rear roller to press inward to the other side of the saw band. The greater the sway force of the saw band, the greater the rotation angle of the cam, the higher the airbag compression and gas transmission pressure, and the synchronous increase of the clamping force of the opposite rear roller. Ultimately, the clamping force of the two rear rollers on the saw band is dynamically adjusted in proportion to the sway force, forming a purely mechanical negative feedback closed loop. This avoids the defects of over-clamping and overheating or under-clamping and swaying in traditional fixed-gap guides, and effectively suppresses saw kerf deviation and rough cut, improving the dimensional accuracy and cross-sectional quality of angle steel fixed-length sawing and beveling. 2. By incorporating an elastic arm, which is arched in shape with an "I"-shaped cross-section, the saw blade exhibits designed bending stiffness in the torsional direction. This generates an elastic restoring torque proportional to the torsional angle, forcing the saw blade to return to its neutral position. The arched shape ensures uniform stress distribution when the elastic arm is subjected to bidirectional torsional loads. Utilizing the material's internal hysteresis effect, the high-frequency torsional vibration energy is converted into heat energy for dissipation, attenuating the torsional amplitude of the saw blade and reducing the high-frequency impact between the back of the saw blade and the guide block. This reduces the risk of saw blade fatigue fracture, extends the saw blade's service life, and improves the smoothness of the cut surface. Attached Figure Description

[0015] Figure 1 This is a frontal three-dimensional structural schematic diagram of the present invention; Figure 2 This is a rear-view three-dimensional structural diagram of the present invention; Figure 3 This is a three-dimensional structural diagram of the cover in the open state of the present invention; Figure 4 This is a three-dimensional structural diagram of the frame of the present invention; Figure 5 This is a frontal three-dimensional structural diagram of the left and right supports of the present invention; Figure 6 This is a rear three-dimensional structural diagram of the left and right supports of the present invention; Figure 7 This is a three-dimensional structural diagram of the elastic arm of the present invention; Figure 8 This is a left-side three-dimensional structural diagram of the support plate of the present invention; Figure 9 This is a right-view three-dimensional structural diagram of the support plate of the present invention; Figure 10 This is a three-dimensional structural diagram of the rear roller of the present invention; Figure 11 This is a three-dimensional structural diagram of the left rack of the present invention; Figure 12 This is a three-dimensional structural diagram of the left airbag of the present invention; Figure 13 This is a three-dimensional structural diagram of the right rack of the present invention; Figure 14 This is a three-dimensional structural diagram of the card block of the present invention.

[0016] The following are the annotations in the diagram: 1. Workbench; 2. Frame; 21. Cover; 22. Saw wheel; 23. Adjusting rod; 3. Column; 4. Right support; 41. Locking block; 42. Push block; 43. Lead screw; 44. Handle; 5. Left support; 6. Clamping seat; 7. Saw blade; 8. Leveling structure; 81. Support plate; 82. Front roller; 83. Rear roller; 831. Connecting rod; 832. Connecting shaft; 833. Connecting block; 84. Cam; 841. Tooth; 842. Connecting plate; 85. Left rack; 851. Left air chamber; 852. Left spring; 853. Left air bladder; 86. Hose; 87. Right rack; 871. Right air chamber; 872. Right air bladder; 873. Right spring; 9. Elastic arm; 91. Guide block; 92. Movable groove; 93. Movable block. Detailed Implementation

[0017] 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.

[0018] Please see Figures 1-14This invention provides a double-column band saw for processing angle steel towers, comprising a worktable 1 and columns 3; a clamping seat 6 is installed on the top of the worktable 1, and a frame 2 is installed on the top of the column 3, with a right support 4 provided on one side of one end of the frame 2; a left support 5 is symmetrically arranged on one side of the right support 4, and a leveling structure 8 is installed at the bottom of both the right support 4 and the left support 5, with an elastic arm 9 provided on the inner side of the leveling structure 8; saw wheels 22 are installed on both sides of the frame 2, and a cover 21 is provided on the outer side of each saw wheel 22; and a saw wheel 22 is installed at the middle position of the frame 2. An adjusting rod 23 is provided, and the right support 4, the left support 5 and the adjusting rod 23 all form a sliding structure. A saw blade 7 is sleeved on the outside of the saw wheel 22. Push blocks 42 are installed inside the right support 4 and the left support 5, and a lead screw 43 is provided at the bottom of the push block 42. The lead screw 43 and the push block 42 are threaded together. A handle 44 is installed at the outer end of the lead screw 43. A locking block 41 is provided on the inner side of the push block 42, and the contact area between the locking block 41 and the push block 42 is at an angle. The locking block 41 and the right support 4 and the left support 5 all form a sliding structure. Reference Figures 1-4 and Figure 14 As shown, when the device is in use, the angle steel is placed in the clamping seat 6 on the workbench 1 and fixed. Then, the distance between the right support 4 and the left support 5 is adjusted according to the width of the angle steel workpiece. Rotating the handle 44 drives the lead screw 43 to rotate, so that the push block 42 moves closer to the handle 44. Since the contact area between the locking block 41 and the push block 42 is at an angle, when the push block 42 moves forward, the locking block 41 loses its support force and the biting force between it and the adjusting rod 23 disappears. The position of the right support 4 and the left support 5 can be adjusted to be close to the width of the workpiece by adjusting the position of the adjusting rod 23. Then, the handle 44 is rotated in the opposite direction to push the push block 42 to squeeze the locking block 41, so that the locking block 41 is locked with the adjusting rod 23 to complete the fixation. A cylinder is installed at the rear of the frame 2 to drive the frame 2 and the saw blade 7 above to move smoothly up and down to ensure the verticality of the sawing feed. At the same time, a servo motor is installed at the rear end of the saw wheel 22. The servo motor saw wheel 22 rotates, driving the closed saw blade 7 to move at high speed to saw the workpiece below. The leveling structure 8 includes a support plate 81 fixed to the outer bottom of the left support 5 and the right support 4. A front roller 82 is mounted on the front end of each support plate 81. Rear rollers 83 are provided at both the front and rear ends of each front roller 82. A cam 84 is mounted on the rear end of each rear roller 83. The corresponding positions of the rear rollers 83 and cams 84 are identical. A left rack 85 is mounted on the rear end of the cam 84 at the bottom of the left support 5, and a right rack 87 is mounted on the rear end of the cam 84 at the bottom of the right support 4. A connecting shaft 832 is mounted on the top of each rear roller 83, and a sliding structure is formed between the connecting shaft 832 and the support plate 81. A connecting block 833 is provided on the rear end of each connecting shaft 832, and a connecting block 833 is mounted on the top of each connecting shaft 832. A connecting plate 842 is installed at the top of both the connecting rod 831 and the cam 84, and the connecting plate 842 and the connecting rod 831 are hinged together. The outer end of the cam 84 is provided with teeth 841, and the teeth 841 are meshed with the left rack 85 and the right rack 87. A left airbag 853 is provided on the inner side of the left rack 85, and a left air chamber 851 is installed on the inner side of the left airbag 853. A left spring 852 is sleeved on the outside of the left airbag 853. A right airbag 872 is installed on the inner side of the right rack 87, and a right air chamber 871 is provided on the inner side of the right airbag 872. A right spring 873 is installed between the right airbag 872 and the right rack 87. A hose 86 is connected between the right air chamber 871 and the left air chamber 851. Reference Figures 5-13As shown, when sawing the workpiece, if the saw blade 7 wobbles to the left, the left rear roller 83 is subjected to lateral pressure. This pressure is transmitted to the connecting plate 842 through the connecting rod 831, causing the connecting plate 842 to rotate clockwise. This causes the cam 84, which is fixed to it, to rotate synchronously, so that the cam 84 rotates to the position of the connecting block 833 and squeezes it. The connecting block 833 is connected to the connecting shaft 832, so that the rear roller 83 presses inward against the left side of the saw blade. At the same time, the rear side of the cam 84 is provided with teeth 841. While the cam 84 rotates clockwise, the left rack 85 connected to it moves inward synchronously. The left airbag 853, the left air chamber 851, the hose 86, the right air chamber 871, and the right airbag 872 are all filled with air, and they are all sealed. The left airbag 853 is initially inflated. The right airbag 872 is initially in a compressed state. The left rack 85 moves inward to pressurize the left airbag 853, causing the air inside to enter the right air chamber 871 through the hose 86. The increased air inside the right air chamber 871 causes the right airbag 872 to expand, pushing the right rack 87 to move synchronously in the direction of the left rack 85. The right rack 87 meshes with the teeth 841 at the rear end of the right cam 84, causing the cam 84 to rotate synchronously clockwise, squeezing the right connecting block 833. This causes the right rear roller 83 to press inward to tighten the right side of the saw band. The greater the saw band sway force, the stronger the pneumatic transmission and cam amplification effect. The clamping force on both sides increases synchronously and automatically, thereby dynamically suppressing the sway. After the sway disappears, the left spring 852 and the right spring 873 reset the rack and airbag, and the clamping force returns to the initial light contact state. The elastic arm 9 is arched, and guide blocks 91 are installed on the inner side of the elastic arm 9. Movable blocks 93 are provided at the top and bottom of the guide blocks 91, and a movable groove 92 is installed at one end of the guide blocks 91 inside the movable blocks 93. The cross-section of the elastic arm 9 is "I". Reference Figures 5-7As shown, during workpiece sawing, elastic arms 9 are provided on the inner sides of both the right support 4 and the left support 5. Guide blocks 91 are installed on the inner sides of the elastic arms 9, and these guide blocks maintain contact with the back of the high-speed moving saw blade 7. Movable blocks 93 are provided at the top and bottom of the guide blocks 91, and the movable blocks 93 are embedded in the movable grooves 92. The movable blocks 93 can slide within the movable grooves 92 to a limited extent. When sawing angle steel, because the angle steel cross-section is L-shaped, the cutting forces on both sides of the saw blade 7 are unbalanced, which may generate a torsional moment around its own axis. This torsional moment is transmitted to the guide blocks 91 through the rear end of the saw blade 7, forcing the guide blocks... The guide block 91 generates a slight following torsional tendency. The deflection force of the guide block 91 acts simultaneously on the web of the "I"-shaped cross section of the elastic arm 9. Since the I-shaped cross section has a designed bending stiffness in the torsional direction, the elastic arm 9 will generate an elastic restoring torque proportional to the torsional angle. This torque acts on the guide block 91, pushing the guide block 91 and the saw blade 7 back to the neutral position. Moreover, the arched shape of the elastic arm 9 makes the stress distribution more uniform when subjected to bidirectional torsional loads, avoiding stress concentration. It also utilizes the viscoelastic effect inside the material to convert torsional vibration energy into heat energy, further attenuating high-frequency torsional vibration.

[0019] 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 described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A double-column band saw for processing angle steel towers, comprising a worktable (1) and columns (3); Its features are: The top of the workbench (1) is equipped with a clamping seat (6), the top of the column (3) is equipped with a frame (2), and a right bracket (4) is provided on one side of one end of the frame (2). A left support (5) is symmetrically arranged on one side of the right support (4). A leveling structure (8) is installed at the bottom of both the right support (4) and the left support (5), and an elastic arm (9) is provided on the inner side of the leveling structure (8). The leveling structure (8) includes a support plate (81) fixed to the outer side of the bottom of the left support (5) and the right support (4), and a front roller (82) is installed at the front end of the support plate (81), and a rear roller (83) is provided at the rear end of the front roller (82), and a cam (84) is installed at the rear end of the rear roller (83).

2. The double-column band saw for processing angle steel towers according to claim 1, characterized in that: Saw wheels (22) are installed on both sides of the frame (2), and a cover (21) is provided on the outer side of the saw wheels (22). An adjusting rod (23) is provided in the middle of the frame (2), and a sliding structure is formed between the right support (4), the left support (5) and the adjusting rod (23). A saw blade (7) is sleeved on the outside of the saw wheel (22).

3. The double-column band saw for processing angle steel towers according to claim 1, characterized in that: Both the right bracket (4) and the left bracket (5) are equipped with push blocks (42), and each push block (42) has a lead screw (43) at its bottom. The lead screw (43) and the push block (42) are connected by threads.

4. The double-column band saw for processing angle steel towers according to claim 3, characterized in that: The outer end of each lead screw (43) is equipped with a handle (44), and the inner side of each push block (42) is provided with a locking block (41). The contact area between the locking block (41) and the push block (42) is at an angle. The locking block (41) and the right bracket (4) and the left bracket (5) form a sliding structure.

5. A double-column band saw for processing angle steel towers according to claim 1, characterized in that: The two sets of rear rollers (83) and cams (84) are designed with the same position. The rear end of the cam (84) at the bottom of the left bracket (5) is equipped with a left rack (85), and the rear end of the cam (84) at the bottom of the right bracket (4) is equipped with a right rack (87).

6. The double-column band saw for processing angle steel towers according to claim 1, characterized in that: Each of the rear rollers (83) is equipped with a connecting shaft (832) at its top end, and a sliding structure is formed between the connecting shaft (832) and the support plate (81). Each of the rear ends of the connecting shaft (832) is provided with a connecting block (833), and each of the top ends of the connecting shaft (832) is equipped with a connecting rod (831).

7. A double-column band saw for processing angle steel towers according to claim 6, characterized in that: Each cam (84) has a connecting plate (842) mounted on its top end, and the connecting plate (842) and the connecting rod (831) are hinged together. Each cam (84) has teeth (841) on its outer end, and the teeth (841) are meshed with the left rack (85) and the right rack (87).

8. A double-column band saw for processing angle steel towers according to claim 5, characterized in that: The left rack (85) has a left airbag (853) on its inner side, and a left air chamber (851) is installed on the inner side of the left airbag (853). The left airbag (853) is fitted with a left spring (852) on its outer side.

9. A double-column band saw for processing angle steel towers according to claim 8, characterized in that: A right airbag (872) is installed on the inner side of the right rack (87), and a right air chamber (871) is provided on the inner side of the right airbag (872). A right spring (873) is installed between the right airbag (872) and the right rack (87), and a hose (86) is connected between the right air chamber (871) and the left air chamber (851).

10. A double-column band saw for processing angle steel towers according to claim 1, characterized in that: The elastic arm (9) is arched, and guide blocks (91) are installed on the inner side of the elastic arm (9). Movable blocks (93) are provided at the top and bottom of the guide blocks (91), and a movable groove (92) is installed at one end of the guide block (91) inside the movable block (93). The cross-section of the elastic arm (9) is "I".

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