Pipe clamping mechanism and small-radius extrusion finishing machine

Abstract

The utility model relates to the technical field of small-radius extrusion finishing machines, in particular to a pipe clamping mechanism and a small-radius extrusion finishing machine. The pipe clamping mechanism comprises an upper die plate and a lower die plate which can be separated and combined, and further comprises a die shaft seat, a mounting face is arranged at the top of the die shaft seat, the lower die plate is fixedly arranged on the mounting face, a guide hole is formed in the die shaft seat in the axial direction, a lifting rod is arranged in the guide hole in a sliding mode, a limiting plate is arranged at one end of the lifting rod, and the upper die plate is fixedly arranged on the limiting plate. A mounting seat is arranged on the side, away from the upper die plate, of the die shaft seat, a first oil cylinder is rotationally arranged at the mounting seat, a connecting rod mechanism is arranged at the first oil cylinder and used for driving the lifting rod to slide along the guide hole, and the small-radius extrusion finishing machine comprises the pipe clamping mechanism. Heat of the heated pipe fitting is prevented from being transferred to the oil cylinder in the extrusion process, and the probability of damage to a sealing piece of the oil cylinder is reduced.

Description

Technical Field

[0001] This utility model relates to the field of small radius extrusion finishing machine technology, specifically to a tube clamping mechanism and a small radius extrusion finishing machine. Background Technology

[0002] With the continuous development of modern industrial technology, the requirements for the space utilization rate of boilers are gradually increasing. Therefore, more small-radius bends are needed. As a result, small-radius extrusion finishing machines are widely used in the boiler manufacturing field. They are a type of equipment that further heats and extrudes bent pipes to reduce their radius and shape them.

[0003] The tube clamping mechanism in the small radius extrusion finishing machine is used to clamp the heated tube to be reduced in radius, so that it can be stably extruded and formed. The existing tube clamping mechanism generally uses a hydraulic cylinder to pull the upper or lower die. However, since the temperature of the heated tube to be reduced in radius is as high as about 800℃, the heat is easily conducted to the hydraulic cylinder and can easily damage the hydraulic cylinder seals, causing frequent oil leakage. Therefore, the seals need to be replaced frequently, resulting in low production efficiency. Utility Model Content

[0004] This utility model provides a tube clamping mechanism and a small-radius extrusion finishing machine, which can overcome some or all of the defects of the prior art.

[0005] According to the present invention, the clamping mechanism includes an upper template and a lower template that can be separated and joined, and a mold shaft seat. The top of the mold shaft seat is provided with a mounting surface. The lower template is fixedly mounted on the mounting surface. The mold shaft seat forms a guide hole along the axial direction. A lifting rod is slidably provided in the guide hole. A limiting plate is provided at one end of the lifting rod. The upper template is fixedly mounted at the limiting plate. A mounting seat is provided on the side of the mold shaft seat away from the upper template. A first oil cylinder is rotatably provided at the mounting seat. A linkage mechanism is provided at the first oil cylinder. The linkage mechanism is used to drive the lifting rod to slide along the guide hole.

[0006] Preferably, the linkage mechanism includes two first connecting plates that are rotatably engaged with one end of the lifting rod, and two second connecting plates that are rotatably engaged with the mold shaft seat. The first connecting plates and the second connecting plates are rotatably engaged with each other. The first cylinder has a retractable first piston rod, and a fork is fixedly provided at the end of the first piston rod. The fork is used to rotatably engage with the first connecting plates and the second connecting plates.

[0007] Preferably, a mating section is formed at one end of the mold shaft seat near the second connecting plate, a first nut is provided at the mating section, two first mating shafts are formed on the side wall of the first nut, and a first mating hole is formed at the second connecting plate, the first mating hole and the first mating shaft are rotatably mated.

[0008] Preferably, a connecting block is provided on the side of the lifting rod near the first connecting plate, and a second mating hole is formed at the connecting block. The second mating hole is used to fix the lifting rod. Two second mating shafts are formed on both sides of the connecting block near the first connecting plate, and a third mating hole is formed on the first connecting plate accordingly. The third mating hole is rotatably mated with the second mating shafts.

[0009] Preferably, four mating lugs are formed at intervals on the side of the fork away from the first hydraulic cylinder, and a fourth mating hole is formed through each of the four mating lugs. A connecting shaft is provided on both sides of the fork, a fifth mating hole is formed at the first connecting plate, and a sixth mating hole is formed at the second connecting plate. The fourth, fifth, and sixth mating holes are all rotatably mated with the connecting shaft.

[0010] Preferably, a second nut is provided at the end of the limiting plate away from the mold shaft seat, and the second nut is used to engage with the lifting rod threadedly.

[0011] A small-radius extrusion finishing machine includes the aforementioned tube clamping mechanism and a housing. Two driving mechanisms are arranged opposite each other on the housing. Each of the two driving mechanisms is equipped with a tube clamping mechanism. The two driving mechanisms are used to drive the tube clamping mechanism to move closer to and away from each other.

[0012] Furthermore, end caps are provided on both sides of the housing, and the driving mechanism includes a second oil cylinder disposed at the end cap. The second oil cylinder has a retractable second piston rod, and a seventh mating hole is formed correspondingly at the end cap. The end of the second piston rod is fixedly mated with the seventh mating hole.

[0013] Furthermore, the top of the second cylinder is provided with a guide plate, and the top of the housing is correspondingly formed with a guide groove. The guide plate is used to slide with the guide groove. Flanges are formed on both sides of the guide plate. A pressure plate is provided on the side of the flange away from the housing. The pressure plate is fixedly engaged with the top of the housing. The pressure plate is used to keep the guide plate against the guide groove. The guide plate is fixedly engaged with the mold shaft seat.

[0014] Furthermore, the mounting base is fixedly fitted to the side of the second hydraulic cylinder away from the end cover.

[0015] Beneficial effects: The method of driving the lifting rod to move through the linkage mechanism to drive the upper template in this application prevents the heat at the bend from being directly conducted to the first oil cylinder, thereby reducing the probability of the first oil cylinder seal being damaged by heat, thus improving the service life of the first oil cylinder and extending the maintenance cycle of the equipment. Attached Figure Description

[0016] Figure 1 This is an isometric schematic diagram of the tube clamping mechanism;

[0017] Figure 2 This is a schematic diagram of the isometric projection of the mold shaft seat;

[0018] Figure 3 This is a schematic diagram of an explosion of a pipe clamping mechanism;

[0019] Figure 4 This is a cross-sectional view of the pipe clamping mechanism;

[0020] Figure 5 A schematic diagram of the isometric projection of a small-radius extrusion finishing machine;

[0021] Figure 6 This is a schematic diagram of an explosion of a small-radius extrusion finishing machine.

[0022] Figure 7 This is a cross-sectional schematic diagram of a small-radius extrusion finishing machine;

[0023] Figure 8 This is a schematic diagram of the working state of a small-radius extrusion finishing machine. Detailed Implementation

[0024] To further understand the content of this utility model, a detailed description of the utility model is provided in conjunction with the embodiments. It should be understood that the embodiments are merely illustrative and not limiting of the utility model.

[0025] Example 1

[0026] Seen in Figure 1-3 This embodiment provides a clamping mechanism, which includes an upper template 101 and a lower template 102 that can be separated and joined, and a mold shaft seat 110. The top of the mold shaft seat 110 is provided with a mounting surface 211. The lower template 102 is fixedly mounted on the mounting surface 211. The mold shaft seat 110 forms a guide hole 212 along the axial direction. A lifting rod 321 is slidably provided in the guide hole 212. One end of the lifting rod 321 is provided with a limiting plate 322. The upper template 101 is fixedly mounted on the limiting plate 322. A mounting seat 323 is provided on the side of the mold shaft seat 110 away from the upper template 101. A first hydraulic cylinder 330 is rotatably provided at the mounting seat 323. A linkage mechanism is provided at the first hydraulic cylinder 330. The linkage mechanism is used to drive the lifting rod 321 to slide along the guide hole 212.

[0027] According to the solution provided in this embodiment, the first oil cylinder 330 can drive the linkage mechanism to drive the lifting rod 321 to rise and fall along the guide hole 212, thereby making the upper template 101 rise and fall relative to the lower template 102 to achieve engagement and separation. The bent pipe to be clamped is set at the lower template 102. By the upper template 101 descending and engaging with the lower template 102, the bent pipe is clamped.

[0028] In this embodiment, by using a linkage mechanism to drive the lifting rod 321 to move and thus drive the upper template 101, the heat at the bend cannot be directly conducted to the first oil cylinder 330, thereby reducing the probability of the seal of the first oil cylinder 330 being damaged by heat, thus improving the service life of the first oil cylinder 330 and extending the maintenance cycle of the equipment.

[0029] Seen in Figure 3-4 The linkage mechanism includes two first connecting plates 341 that are rotatably engaged with one end of the lifting rod 321, and two second connecting plates 342 that are rotatably engaged with the mold shaft seat 110. The first connecting plates 341 and the second connecting plates 342 are rotatably engaged with each other. The first oil cylinder 330 has a telescopic first piston rod 431. A fork 343 is fixedly provided at the end of the first piston rod 431. The fork 343 is used to rotatably engage with the first connecting plates 341 and the second connecting plates 342.

[0030] Among them, the mold shaft seat 110 forms a mating section 4211 near the second connecting plate 342. A first nut 324 is provided at the mating section 4211. Two first mating shafts 3241 are formed on the side wall of the first nut 324. A first mating hole 3421 is formed at the second connecting plate 342. The first mating hole 3421 and the first mating shaft 3241 are rotatably mated.

[0031] Furthermore, a connecting block 325 is provided on the side of the lifting rod 321 near the first connecting plate 341. A second mating hole 3251 is formed at the connecting block 325. The second mating hole 3251 is used for fixed mating with the lifting rod 321. Two second mating shafts 3252 are formed on both sides of the connecting block 325 near the first connecting plate 341. A third mating hole 3411 is formed at the first connecting plate 341. The third mating hole 3411 is rotatably mated with the second mating shafts 3252.

[0032] Seen in Figure 3 The fork 343 has four mating lugs 3431 spaced apart on the side away from the first cylinder 330. A fourth mating hole 3432 is formed through each of the four mating lugs 3431. A connecting shaft 344 is provided on both sides of the fork 343. A fifth mating hole 3412 is formed at the first connecting plate 341, and a sixth mating hole 3422 is formed at the second connecting plate 342. The fourth mating hole 3432, the fifth mating hole 3412, and the sixth mating hole 3422 are all rotatably mated with the connecting shaft 344.

[0033] Specifically, the first piston rod 431 can drive the fork 343 to move axially along the first piston rod 431. When the first piston rod 431 moves in the direction of extending out of the first oil cylinder 330, the angle between the first connecting plate 341 and the second connecting plate 342 increases, the lifting rod 321 rises, and the upper template 101 rises. When the first piston rod 431 moves in the direction of retracting the first oil cylinder 330, the angle between the first connecting plate 341 and the second connecting plate 342 decreases, the lifting rod 321 descends, and the upper template 101 descends to cooperate with the lower template 102, thus forming a clamping of the bent pipe.

[0034] Seen in Figure 3 The limiting plate 322 has a second nut 326 at the end away from the mold shaft seat 110. The second nut 326 is used to engage with the lifting rod 321 through a thread.

[0035] Specifically, the second nut 326 can engage the lifting rod 321 with the limiting plate 322, thereby forming a relatively fixed positional relationship between the lifting rod 321 and the upper template 101.

[0036] Example 2

[0037] Seen in Figure 5 This embodiment provides a small radius extrusion finishing machine, which includes a housing 550. Two driving mechanisms are provided opposite to each other at the housing 550. Each of the two driving mechanisms is provided with the tube clamping mechanism described in Embodiment 1. The two driving mechanisms are used to drive the tube clamping mechanism to move closer to and away from each other.

[0038] According to the solution provided in this embodiment, the pipe clamping mechanism is used to clamp the straight pipes on both sides of the bend, and the two straight pipes are brought closer to each other by the driving mechanism, thereby reducing the radius of the bend.

[0039] Seen in Figure 5-7 The housing 550 has end caps 551 on both sides. The drive mechanism includes a second cylinder 660 located at the end cap 551. The second cylinder 660 has a retractable second piston rod 661. A seventh mating hole 6511 is formed at the end cap 551. The end of the second piston rod 661 is fixedly mated with the seventh mating hole.

[0040] The second hydraulic cylinder 660 is provided with a guide plate 670 at the top, and a guide groove 652 is formed on the top of the housing 550. The guide plate 670 is used to slide with the guide groove 652. Flanges 671 are formed on both sides of the guide plate 670. A pressure plate 680 is provided on the side of the flange 671 away from the housing 550. The pressure plate 680 is fixedly engaged with the top of the housing 550. The pressure plate 680 is used to keep the guide plate 670 abutting against the guide groove 652. The guide plate 670 is fixedly engaged with the mold shaft seat 110.

[0041] Specifically, the flange 671 of the guide plate 670 can cooperate with the guide groove 652, thereby enabling the second oil cylinder 660 to move along the length direction of the guide groove 652, and the pressure plate 680 can keep the guide plate 670 always within the guide groove 652.

[0042] Seen in Figure 7 The mounting base 323 is fixedly engaged with the side of the second cylinder 660 away from the end cover 551, thereby achieving a better fixed engagement between the pipe clamping mechanism and the second cylinder 660, so that the second cylinder 660 can drive the pipe clamping mechanism to move.

[0043] Working principle:

[0044] Seen in Figure 1-8The heated straight pipes on both sides of the bend are placed on the lower template 102. The first hydraulic cylinder 330 drives the first connecting plate 341 and the second connecting plate 342 to decrease their angle, causing the upper template 101 to descend and clamp the straight pipes. Then, the two second hydraulic cylinders 660 drive the two clamping mechanisms to move towards each other, bringing the two clamped straight pipes closer together, thereby reducing the radius of the bend. After the radius reduction process is completed, the first hydraulic cylinder 330 drives the first connecting plate 341 and the second connecting plate 342 to increase their angle, causing the upper template 101 to rise. The processed bend can then be removed.

[0045] It is readily understood that those skilled in the art can combine, split, or reorganize the embodiments provided in this application to obtain other embodiments, all of which do not exceed the protection scope of this application.

[0046] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the embodiments shown are only part of the embodiments of the present invention. The actual structure is not limited to this. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A tube clamping mechanism, comprising an upper template (101) and a lower template (102) that can be detached and joined, characterized in that, It also includes a mold shaft seat (110), the top of the mold shaft seat (110) is provided with a mounting surface (211), the lower template (102) is fixedly provided at the mounting surface (211), the mold shaft seat (110) forms a guide hole (212) along the axial direction, a lifting rod (321) is slidably provided in the guide hole (212), a limiting plate (322) is provided at one end of the lifting rod (321), the upper template (101) is fixedly provided at the limiting plate (322), a mounting seat (323) is provided on the side of the mold shaft seat (110) away from the upper template (101), a first oil cylinder (330) is rotatably provided at the mounting seat (323), a linkage mechanism is provided at the first oil cylinder (330), and the linkage mechanism is used to drive the lifting rod (321) to slide along the guide hole (212).

2. The tube clamping mechanism according to claim 1, characterized in that, The linkage mechanism includes two first connecting plates (341) that are rotatably engaged with one end of the lifting rod (321), and two second connecting plates (342) that are rotatably engaged with the mold shaft seat (110). The first connecting plates (341) and the second connecting plates (342) are rotatably engaged with each other. The first oil cylinder (330) has a telescopic first piston rod (431). A fork (343) is fixedly provided at the end of the first piston rod (431). The fork (343) is used to rotatably engage with the first connecting plate (341) and the second connecting plate (342).

3. The tube clamping mechanism according to claim 2, characterized in that, The mold shaft seat (110) forms a mating section (4211) near the end of the second connecting plate (342). A first nut (324) is provided at the mating section (4211). Two first mating shafts (3241) are formed on the side wall of the first nut (324). A first mating hole (3421) is formed at the second connecting plate (342). The first mating hole (3421) and the first mating shaft (3241) are rotatably mated.

4. The tube clamping mechanism according to claim 2, characterized in that, A connecting block (325) is provided on the side of the lifting rod (321) near the first connecting plate (341). A second mating hole (3251) is formed at the connecting block (325). The second mating hole (3251) is used to fix the lifting rod (321). Two second mating shafts (3252) are formed on both sides of the connecting block (325) near the first connecting plate (341). A third mating hole (3411) is formed at the first connecting plate (341). The third mating hole (3411) is rotatably mated with the second mating shaft (3252).

5. The tube clamping mechanism according to claim 4, characterized in that, Four mating lugs (3431) are formed at intervals on the side of the fork (343) away from the first oil cylinder (330). A fourth mating hole (3432) is formed through each of the four mating lugs (3431). A connecting shaft (344) is provided on both sides of the fork (343). A fifth mating hole (3412) is formed at the first connecting plate (341), and a sixth mating hole (3422) is formed at the second connecting plate (342). The fourth mating hole (3432), the fifth mating hole (3412), and the sixth mating hole (3422) are all rotatably mated with the connecting shaft (344).

6. The tube clamping mechanism according to claim 1, characterized in that, The limiting plate (322) is provided with a second nut (326) at the end away from the mold shaft seat (110), and the second nut (326) is used to engage with the lifting rod (321) threadedly.

7. A small-radius extrusion finishing machine, characterized in that, The device includes the clamping mechanism according to any one of claims 1-6, and further includes a housing (550). Two driving mechanisms are provided opposite to each other at the housing (550). Each of the two driving mechanisms is provided with a clamping mechanism. The two driving mechanisms are used to drive the clamping mechanism to move closer to and away from each other.

8. The small-radius extrusion finishing machine according to claim 7, characterized in that, The housing (550) has end caps (551) on both sides. The drive mechanism includes a second cylinder (660) located at the end cap (551). The second cylinder (660) has a retractable second piston rod (661). A seventh mating hole (6511) is formed at the end cap (551). The end of the second piston rod (661) is fixedly mated with the seventh mating hole.

9. The small-radius extrusion finishing machine according to claim 8, characterized in that, The second cylinder (660) is provided with a guide plate (670) at the top, and a guide groove (652) is formed on the top of the housing (550). The guide plate (670) is used to slide with the guide groove (652). Flanges (671) are formed on both sides of the guide plate (670). A pressure plate (680) is provided on the side of the flange (671) away from the housing (550). The pressure plate (680) is fixedly engaged with the top of the housing (550). The pressure plate (680) is used to keep the guide plate (670) against the guide groove (652). The guide plate (670) is fixedly engaged with the mold shaft seat (110).

10. The small-radius extrusion finishing machine according to claim 8, characterized in that, The mounting base (323) is fixedly engaged with the side of the second cylinder (660) away from the end cover (551).

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