Square tube straightening machine

Abstract

The application discloses a square tube straightening machine, which comprises a bed body, a fixed jaw seat and a movable jaw seat, the movable jaw seat is connected to the end of a piston rod of an oil cylinder in an extendable and retractable mode, the oil cylinder is fixed on an oil cylinder seat, the oil cylinder seat is positioned on the bed body, a hydraulic gauge is arranged on the oil cylinder, the fixed jaw seat is fixed on a mounting seat at one end of the bed body, and the mounting seat is provided with an angle self-adapting mechanism in the middle part of the mounting seat for correcting coaxiality error of the square tube clamped between the two jaw mechanisms; when the square tube is straightened, the value of the hydraulic gauge reaches a preset value, the piston rod of the oil cylinder stops retracting and keeps the tension to a preset time, the square tube is straightened and extended under the action of the tension and is shaped until the shaping is completed, the square tube straightening machine is reliable, efficient and high in product yield, and the square tube straightened by the square tube straightening machine is high in precision.

Description

Technical Field

[0001] This invention relates to a square tube straightening machine. Background Technology

[0002] In existing technologies, straightening stainless steel square tubes is difficult due to their shape. The main method is to clamp the tube between two long straightening plates. This method has the following drawbacks: Firstly, because the square tube is long, the corresponding straightening plates are also long, and the number of driving mechanisms to move the plates is limited, leading to uneven stress on the tube during straightening and consequently, insufficient accuracy in the final straightened tube. Secondly, since the two straightening plates can only straighten two sides of the tube at a time, each tube requires two straightening processes, resulting in low processing efficiency. Thirdly, this type of straightening equipment is prone to clamping and denting the tube, leading to a high scrap rate. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a more reliable, efficient, and high-yield square tube straightening machine, and the square tubes straightened by it also have the advantage of high precision.

[0004] The technical solution of the present invention is: a square tube straightening machine, comprising a bed, a fixed jaw seat and a movable jaw seat, wherein the two ends of the square tube to be straightened are respectively clamped on the jaw mechanism on the fixed jaw seat and the movable jaw seat;

[0005] The movable jaw seat is telescopically connected to the end of the piston rod of a hydraulic cylinder. The hydraulic cylinder is fixed on a hydraulic cylinder seat, which is positioned on the bed. A hydraulic gauge is provided on the hydraulic cylinder.

[0006] The fixed jaw seat is fixed on the mounting seat at one end of the bed, and the middle part of the mounting seat also has an angle adaptive mechanism for correcting the coaxiality error when the square tube is clamped between the two jaw mechanisms.

[0007] When the square tube is straightened, the piston rod of the hydraulic cylinder retracts, causing the movable claw seat to move towards the hydraulic cylinder, applying a pulling force to the square tube. When the value of the hydraulic gauge reaches the preset value, the piston rod of the hydraulic cylinder stops retracting and maintains the pulling force for the preset time. Under the action of the pulling force, the square tube is straightened and extended until it is shaped.

[0008] Furthermore, it also includes a controller, to which the hydraulic cylinder, hydraulic gauge, and chuck mechanism are all connected.

[0009] Furthermore, the claw mechanism includes a hydraulic cylinder, a guide seat, and two claw bodies fixed on a fixed claw seat or a movable claw seat. The piston rod of the hydraulic cylinder is connected to the guide seat through a connecting rod. The guide seat has a V-shaped guide groove. The two claw bodies are respectively disposed on both sides of the guide groove and move along the side wall of the guide groove. The opposing side of the two claw bodies also has anti-slip texture.

[0010] Furthermore, there are two connecting rods, and a connecting plate is fixed to the end of the piston rod. The two connecting rods are respectively disposed between the connecting plate and the rear ends of the fixed claw seat or the movable claw seat, and springs are respectively sleeved on the two connecting rods.

[0011] Furthermore, both the fixed claw seat and the movable claw seat are provided with pads. The fixed claw seat or the movable claw seat at the rear end of the guide groove has a triangular fixed platform. The pad is fixed at the end of the fixed platform facing the guide groove. The shape and volume of the pad correspond to the internal shape of the square tube. The pad is inserted into the end of the square tube to cooperate with the two claw bodies to clamp the square tube.

[0012] Furthermore, the fixing platform has a screw hole, the rear end of the pad has a threaded post, and the pad is screwed onto the fixing platform.

[0013] Furthermore, the mounting base is divided into an upper body and a lower body. The lower body is fixed to the end of the bed, the angle adaptive mechanism is disposed between the upper body and the lower body, and the fixing claw seat is fixed to the top of the upper body.

[0014] Furthermore, the angle adaptive mechanism includes an upper plate and a lower plate. The upper plate is fixed to the bottom of the upper body, and the lower plate is fixed to the top of the lower body. A connecting shaft is fixed in the middle of the lower plate. The top of the connecting shaft is rotatably connected to the upper plate. A torsion spring is also provided between the connecting shaft and the upper plate.

[0015] Furthermore, multiple arc-shaped grooves are arrayed on the upper and lower plates of the outer periphery of the connecting shaft, and an auxiliary rod that serves to limit and support is slidably connected between each pair of corresponding upper and lower arc-shaped grooves.

[0016] Furthermore, a rack is fixed to the end of the bed away from the mounting seat, and the bottom of the cylinder seat has corresponding teeth on the rack. The cylinder seat is snapped onto the rack and fixed to the rack with bolts.

[0017] The beneficial effects of this invention are:

[0018] 1. A straightening machine with one fixed end and the other traction is designed for square tubes to straighten them, which will not cause the square tubes to be crushed or flattened, thus improving the straightening accuracy and yield of square tubes. Moreover, the straightening purpose of square tubes can be achieved in one straightening operation, which has the advantage of high processing efficiency.

[0019] 2. A hydraulic gauge is installed on the oil cylinder used to pull the movable jaw seat to precisely control the pulling force. After the square tube is straightened, the oil cylinder maintains the pulling force for a preset time, so that the square tube is extended to a certain extent, eliminating the stress in the straightening process of the square tube and ensuring the straightening effect of the square tube.

[0020] 3. A reliable clamping mechanism was designed to firmly hold both ends of the square tube and prevent deformation of the ends of the square tube during the straightening process.

[0021] 4. A mounting base with an angle adaptive mechanism was designed to automatically correct the coaxiality error of the square tube between the fixed jaw seat and the movable jaw seat, and to facilitate the insertion of square tubes with large bending amplitudes.

[0022] 5. The position of the cylinder seat is adjustable and the fixing method is reliable, which can adapt to the straightening of square tubes of various lengths. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the present invention;

[0024] Figure 2 This is a top view of the present invention;

[0025] Figure 3 This is a schematic diagram of the movable claw seat in this invention;

[0026] Figure 4 yes Figure 3 Enlarged view of section A;

[0027] Figure 5 This is a schematic diagram of the structure of the pad block in this invention;

[0028] Figure 6 This is a schematic diagram of the mounting base in this invention;

[0029] Figure 7 This is a schematic diagram of the lower plate structure of the angle adaptive mechanism of the present invention;

[0030] Figure 8 yes Figure 1 Enlarged view of section B in the middle.

[0031] In the diagram: 1. Bed; 2. Fixed jaw seat; 3. Movable jaw seat; 4. Square tube; 5. Hydraulic cylinder; 6. Hydraulic cylinder seat; 7. Mounting seat; 8. Angle adaptive mechanism; 9. Hydraulic cylinder; 10. Guide seat; 11. Jaw body; 12. Connecting rod; 13. Guide groove; 14. Anti-slip texture; 15. Connecting plate; 16. Spring; 17. Pad; 18. Fixed platform; 19. Threaded column; 20. Upper body; 21. Lower body; 22. Upper plate; 23. Lower plate; 24. Connecting shaft; 25. Torsion spring; 26. Arc groove; 27. Auxiliary rod; 28. Rack; 29. ​​Tooth pattern. Detailed Implementation

[0032] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0033] Combination Figure 1 and Figure 2 As shown, a square tube straightening machine includes a bed 1, a fixed jaw seat 2 and a movable jaw seat 3. The two ends of the square tube 4 to be straightened are respectively clamped on the jaw mechanisms on the fixed jaw seat 2 and the movable jaw seat 3.

[0034] The movable jaw seat 3 is telescopically connected to the end of the piston rod of a hydraulic cylinder 5. The hydraulic cylinder 5 is fixed on a hydraulic cylinder seat 6, which is positioned on the bed 1. A hydraulic gauge is provided on the hydraulic cylinder 5.

[0035] The fixed jaw seat 2 is fixed on the mounting seat 7 at one end of the bed 1. The middle part of the mounting seat 7 also has an angle adaptive mechanism 8 for correcting the coaxiality error when the square tube 4 is clamped between the two jaw mechanisms. When the square tube 4 is straightened, the upper end of the mounting seat 7 can rotate by a corresponding angle to make the square tube 4 accurately straight and avoid the two ends of the square tube 4 from twisting due to coaxiality error.

[0036] When the square tube 4 is straightened, the piston rod of the oil cylinder 5 retracts, causing the movable claw seat 3 to move towards the oil cylinder 5, applying a pulling force to the square tube 4. When the value of the hydraulic gauge reaches the preset value, the piston rod of the oil cylinder 5 stops retracting and maintains the pulling force for the preset time. The square tube 4 is straightened and extended under the action of the pulling force until it is shaped.

[0037] It is worth mentioning that the extension generated during the process of maintaining the square tube 4 under constant tension for a preset time can effectively eliminate the stress generated during the straightening process of the square tube 4, and prevent the square tube 4 from springing back after being straightened, causing the straightened square tube 4 to return to a bent state again.

[0038] Since the process parameters such as the hydraulic gauge values ​​and the holding time of tension when straightening square tubes 4 of different specifications can be obtained through repeated experiments, they will not be elaborated here.

[0039] In another embodiment, a controller is also included. The oil cylinder 5, the hydraulic gauge and the chuck mechanism are all connected to the controller. The controller is pre-loaded with relevant data such as straightening process parameters for square tubes 4 of different specifications, so as to facilitate automated control.

[0040] In another embodiment, such as Figure 3As shown, the jaw mechanism includes a hydraulic cylinder 9, a guide seat 10, and two jaw bodies 11 fixed on a fixed jaw seat 2 or a movable jaw seat 3. The piston rod of the hydraulic cylinder 9 is connected to the guide seat 10 via a connecting rod 12. The guide seat 10 has a V-shaped guide groove 13. The two jaw bodies 11 are respectively disposed on both sides of the guide groove 13 and move along the side wall of the guide groove 13. The opposing side of the two jaw bodies 11 also has anti-slip texture 14. When clamping the square tube 4, as the piston rod of the hydraulic cylinder 9 moves backward, the two jaw bodies 11 abut against the two ends of the square tube 4 and move towards the front end of the guide groove 13, gradually locking the two sides of the square tube 4. The clamping force increases with the increase of the tension, which can ensure the reliability of clamping the end of the square tube 4.

[0041] In another embodiment, such as Figure 3 As shown, there are two connecting rods 12. A connecting plate 15 is fixed to the end of the piston rod. The two connecting rods 12 are respectively disposed between the connecting plate 15 and the rear ends of the fixed claw seat 2 or the movable claw seat 3. A spring 16 is also sleeved on each of the two connecting rods 12. The spring 16 mainly plays a buffering role to prevent the fixed claw seat 2 or the movable claw seat 3 from rebounding and damaging the hydraulic cylinder 9 when the locking of the end of the opposite tube 4 is released.

[0042] In another embodiment, combined Figure 3-5 As shown, both the fixed claw seat 2 and the movable claw seat 3 are provided with pads 17. The fixed claw seat 2 or the movable claw seat 3 at the rear end of the guide groove 13 has a triangular fixed platform 18. The pad 17 is fixed at one end of the fixed platform 18 facing the guide groove 13. The shape and volume of the pad 17 correspond to the internal shape of the square tube 4. The pad 17 is inserted into the end of the square tube 4 to cooperate with the two claw bodies 11 to clamp the square tube 4, so as to prevent the claws from directly crushing the end of the square tube 4.

[0043] Specifically, the fixed platform 18 has screw holes, the rear end of the pad 17 has a threaded post 19, and the pad 17 is screwed onto the fixed platform 18 so as to select a suitable pad 17 according to the specifications of the square tube 4.

[0044] Furthermore, the front end of the pad 17 is frustum-shaped to facilitate insertion into the end of the square tube 4.

[0045] In another embodiment, such as Figure 6 As shown, the mounting base 7 is divided into an upper body 20 and a lower body 21. The lower body 21 is fixed to the end of the bed 1. The angle adaptive mechanism 8 is disposed between the upper body 20 and the lower body 21. The fixing claw seat 2 is fixed to the top of the upper body 20.

[0046] In another embodiment, combined Figure 6 and Figure 7As shown, the angle adaptive mechanism 8 includes an upper plate 22 and a lower plate 23. The upper plate 22 is fixed to the bottom of the upper body 20, and the lower plate 23 is fixed to the top of the lower body 21. A connecting shaft 24 is fixed in the middle of the lower plate 23. The top of the connecting shaft 24 is rotatably connected to the upper plate 22. A torsion spring 25 is also provided between the connecting shaft 24 and the upper plate 22 to facilitate the reset of the upper body 20. When the square tube 4 is straightened, the upper body 20 can rotate at a certain angle to adapt to the coaxiality error at both ends of the square tube 4.

[0047] In another embodiment, such as Figure 7 As shown, multiple arc-shaped grooves 26 are arrayed on the upper plate 22 and lower plate 23 on the outer periphery of the connecting shaft 24. An auxiliary rod 27 is slidably connected between each pair of corresponding upper and lower arc-shaped grooves 26. Each arc-shaped groove 26 and the auxiliary rod 27 cooperate to limit the rotation angle of the upper body 20, so as to avoid the upper body 20 from rotating too much. Each auxiliary rod 27 also plays an auxiliary support role to ensure the stability of the upper body 20 and to prevent the connecting shaft 24 from being twisted due to excessive force.

[0048] In another embodiment, combined Figure 1 and Figure 8 As shown, a rack 28 is fixed at the end of the bed 1 away from the mounting seat 7. The bottom of the cylinder seat 6 has corresponding teeth 29 on the rack 28. The cylinder seat 6 is snapped onto the rack 28 and fixed to the rack 28 with bolts. On the one hand, the position of the cylinder seat 6 can be adjusted according to the length of the square tube 4, and on the other hand, the reliability of the cylinder seat 6 is ensured.

Claims

1. A square tube straightening machine, characterized in that, It includes a bed (1), a fixed jaw seat (2) and a movable jaw seat (3), and the two ends of the square tube (4) to be straightened are respectively clamped on the jaw mechanism on the fixed jaw seat (2) and the movable jaw seat (3); The movable jaw seat (3) is telescopically connected to the piston rod end of a hydraulic cylinder (5). The hydraulic cylinder (5) is fixed on a hydraulic cylinder seat (6). The hydraulic cylinder seat (6) is positioned on the bed (1). The hydraulic cylinder (5) is equipped with a hydraulic gauge. The fixed jaw seat (2) is fixed on the mounting seat (7) at one end of the bed (1). The middle part of the mounting seat (7) also has an angle adaptive mechanism (8) for correcting the coaxiality error when the square tube (4) is clamped between the two jaw mechanisms. When the square tube (4) is straightened, the piston rod of the oil cylinder (5) retracts, driving the movable claw seat (3) to move towards the oil cylinder (5) and applying a pulling force to the square tube (4). When the value of the hydraulic gauge reaches the preset value, the piston rod of the oil cylinder (5) stops retracting and maintains the pulling force for the preset time. The square tube (4) is straightened and extended under the action of the pulling force until it is shaped. The mounting base (7) is divided into an upper body (20) and a lower body (21). The lower body (21) is fixed to the end of the bed (1). The angle adaptive mechanism (8) is set between the upper body (20) and the lower body (21). The fixed claw seat (2) is fixed to the top of the upper body (20). The angle adaptive mechanism (8) includes an upper plate (22) and a lower plate (23). The upper plate (22) is fixed to the bottom of the upper body (20), and the lower plate (23) is fixed to the top of the lower body (21). A connecting shaft (24) is fixed in the middle of the lower plate (23). The top of the connecting shaft (24) is rotatably connected to the upper plate (22). A torsion spring (25) is also provided between the connecting shaft (24) and the upper plate (22). The upper plate (22) and lower plate (23) on the outer periphery of the connecting shaft (24) are also arrayed with multiple arc-shaped grooves (26), and an auxiliary rod (27) that serves to limit and support is slidably connected between each pair of corresponding upper and lower arc-shaped grooves (26).

2. The square tube straightening machine according to claim 1, characterized in that, It also includes a controller, and the oil cylinder (5), hydraulic gauge and chuck mechanism are all connected to the controller.

3. A square tube straightening machine according to claim 2, characterized in that, The claw mechanism includes a hydraulic cylinder (9), a guide seat (10), and two claw bodies (11) fixed on a fixed claw seat (2) or a movable claw seat (3). The piston rod of the hydraulic cylinder (9) is connected to the guide seat (10) through a connecting rod (12). The guide seat (10) has a V-shaped guide groove (13). The two claw bodies (11) are respectively disposed on both sides of the guide groove (13) and move along the side wall of the guide groove (13). The opposing side of the two claw bodies (11) also has anti-slip texture (14).

4. A square tube straightening machine according to claim 3, characterized in that, There are two connecting rods (12). A connecting plate (15) is fixed to the end of the piston rod. The two connecting rods (12) are respectively located between the connecting plate (15) and the rear ends of the fixed claw seat (2) or the movable claw seat (3). Springs (16) are also respectively sleeved on the two connecting rods (12).

5. A square tube straightening machine according to claim 4, characterized in that, Both the fixed claw seat (2) and the movable claw seat (3) are provided with pads (17). The fixed claw seat (2) or the movable claw seat (3) at the rear end of the guide groove (13) has a triangular fixed platform (18). The pad (17) is fixed at one end of the fixed platform (18) facing the guide groove (13). The shape and volume of the pad (17) correspond to the internal shape of the square tube (4). The pad (17) is inserted into the end of the square tube (4) to cooperate with the two claw bodies (11) to clamp the square tube (4).

6. A square tube straightening machine according to claim 5, characterized in that, The fixed platform (18) has a screw hole, and the rear end of the pad (17) has a threaded post (19). The pad (17) is screwed onto the fixed platform (18).

7. A square tube straightening machine according to claim 6, characterized in that, A rack (28) is fixed to one end of the bed (1) away from the mounting seat (7). The bottom of the cylinder seat (6) has teeth (29) corresponding to the rack (28). The cylinder seat (6) is snapped onto the rack (28) and fixed to the rack (28) by bolts.

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