A punch top rod pre-rotation device

Abstract

The present application relates to the technical field of perforating machine, more particularly, to a kind of perforating machine top rod pre-rotation device, including rack, first rotary member, second rotary member and the rotary drive mechanism of driving first rotary member rotation;First rotary member rotation is arranged on rack, second rotary member is coaxially arranged and rotationally connected with first rotary member, power transmission mechanism is arranged between second rotary member and first rotary member, power transmission mechanism includes slider, slide bar and roller, the outer circumference of second rotary member is provided with coaxial first roller way and second roller way, the circumference diameter of second roller way is greater than the circumference diameter of first roller way, transition roller way is arranged on the side of second roller way close to first roller way, and first roller way is connected with transition roller way by arc-shaped roller way.This application is combined with the structure of power transmission mechanism and double rotary member, realizes controllable reverse pre-rotation of top rod and automatic release of torque after biting into, significantly improves the efficiency of biting into centering.

Description

Technical Field

[0001] This invention relates to the field of perforation machine technology, and more specifically, to a pre-rotation device for a perforation machine top rod. Background Technology

[0002] In the hot piercing process of seamless steel pipes, the mandrel needs to quickly center the bar stock during the biting stage to reduce mandrel wear and equipment vibration. In traditional piercing mills, the mandrel is usually a passive rotating structure that relies on the friction of the bar stock to drive the rotation, resulting in poor centering effect and severe mandrel wear during the initial biting stage.

[0003] Chinese invention patent application number 201810462292.9 discloses a high-precision piercing machine with pre-rotation of a push rod. This machine adds a pre-rotation mechanism to a traditional push rod and drives the mechanism to rotate with external force, causing the push rod to pre-rotate along a trajectory opposite to the rotation direction of the bar stock. When the push rod tip initially contacts the bar stock and performs a centering operation, the rotational inertia generated by the reverse rotation causes the push rod to quickly and accurately embed itself into the bar stock.

[0004] While this solution can improve the centering effect of the push rod to some extent, its power transmission relies on rollers that are in contact with both the driving and driven rings. Once the push rod contacts the bar stock, its power transmission is immediately cut off, making it difficult to accurately ensure that the push rod bites into the bar stock.

[0005] Therefore, it is necessary to improve existing technologies. Summary of the Invention

[0006] To overcome the shortcomings of the existing technology, a pre-rotation device for the top rod of a piercing machine is provided.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0008] A pre-rotation device for a punching machine top rod includes a frame, a first rotating component, a second rotating component, and a rotation drive mechanism for driving the first rotating component to rotate.

[0009] The first rotating component is rotatably mounted on the frame, and the second rotating component is coaxially mounted and rotatably connected to the first rotating component. A power transmission mechanism is provided between the second rotating component and the first rotating component. The frame is fixedly mounted on the piercing machine, and the top rod of the piercing machine passes through the second rotating component and is circumferentially limited by the second rotating component.

[0010] The power transmission mechanism includes a slider, a slide bar, and rollers. A first roller track and a second roller track with the same axis are provided on the outer circumference of the second rotating part. The circumferential diameter of the second roller track is larger than that of the first roller track. A transition roller track is provided on the side of the second roller track close to the first roller track. The first roller track and the transition roller track are connected by an arc-shaped roller track.

[0011] The first rotating component has a sliding groove along its side wall along the axial direction. The slider is slidably disposed in the sliding groove. A circular through hole is provided in the middle of the slider. One end of the slider rod is inserted into the circular through hole. A limit ring is provided at the end of the slider rod. A limit stop edge that cooperates with the limit ring is provided in the circular through hole.

[0012] The roller is rotatably mounted at the other end of the slide bar and contacts the second rotating component. A positioning block is provided in the middle of the slide bar, and a compression spring is provided between the positioning block and the slider. One side of the arc-shaped roller track and the transition roller track is provided with a guide edge to guide the roller from the first roller track into the second roller track.

[0013] Preferably, a support ring is rotatably provided on the second rotating component, and the outer circular surface of the support ring forms a second roller track.

[0014] Preferably, at least two power transmission mechanisms are evenly distributed along the circumference of the first rotating component.

[0015] Preferably, the middle part of the slide rod is a threaded rod, the positioning block is a positioning nut that is threadedly engaged with the threaded rod, and a locking nut is also provided on the threaded rod.

[0016] Preferably, the first rotating component has end caps detachably connected to both ends, and the end caps at both ends are rotatably connected to the frame via first bearings.

[0017] Two second bearings are provided between the outer circular surface of the second rotating component and the inner circular surface of the first rotating component, and a flange for axial positioning of the two second bearings is provided on the outer circular surface of the second rotating component.

[0018] Preferably, the rotary drive mechanism includes a swing base, a hinge seat, a hinge column, a swing frame, and a gear. The hinge seat and the hinge column are both fixedly mounted on the swing base. The middle part of the swing frame is hinged to the upper end of the hinge column. A hydraulic cylinder is hinged to the hinge seat. The piston rod of the hydraulic cylinder is hinged to one end of the swing frame. The gear is rotatably mounted on the other end of the swing frame via a gear shaft. The gear is connected to a gear drive mechanism.

[0019] A gear ring is fixedly connected to the outer circumference of the first rotating part, and the gear meshes with the gear ring.

[0020] Preferably, the gear drive mechanism includes a reduction motor mounted on the upper side of the swing frame, a first sprocket mounted on the motor shaft of the reduction motor, and a second sprocket mounted on the gear shaft, with the first sprocket and the second sprocket connected by a chain drive.

[0021] Preferably, the geared motor is slidably mounted on the swing frame, and the swing frame is provided with a bolt tensioning device, the working end of which is in contact with the geared motor.

[0022] Preferably, the second rotating component and the push rod are circumferentially limited by a flat key or spline.

[0023] Preferably, a flange is welded to one end of the frame.

[0024] The beneficial effects of this invention compared to the prior art are as follows:

[0025] 1. This application combines a power transmission mechanism with a double-rotating component structure to achieve controllable reverse pre-rotation of the push rod and automatic torque release after biting. In the initial stage, a compression spring pushes the roller to press against the first roller conveyor, efficiently transmitting the reverse torque of the first rotating component to the second rotating component to drive the push rod, significantly improving biting and centering efficiency. After biting, the reverse torque of the bar stock pushes the roller along the arc-shaped roller conveyor and transition roller conveyor into the second roller conveyor. Even when the roller is located on the arc-shaped roller conveyor, it can still transmit torque to the push rod. Upon entering the second roller conveyor, due to the circular structure of the second roller conveyor, torque transmission is automatically released.

[0026] 2. This application, by setting the slide bar on the slider, allows the slide bar and roller to move automatically as the top rod moves axially with the arc-shaped roller conveyor, preventing interference. The combination of the threaded rod and the positioning nut supports spring preload adjustment, allowing different preloads to be selected as needed. Attached Figure Description

[0027] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] Figure 1 This is a schematic diagram of the assembly of the first rotating component and the second rotating component of the present invention;

[0029] Figure 2 This is an exploded view of the present invention;

[0030] Figure 3 A structural schematic diagram showing one angle of the second rotating component;

[0031] Figure 4 This is a structural schematic diagram of the second rotating component from another angle;

[0032] Figure 5 This is a schematic diagram of the power transmission mechanism;

[0033] Figure 6 This is a cross-sectional schematic diagram of the power transmission mechanism;

[0034] Figure 7 This is a front view schematic diagram of the rotary drive mechanism;

[0035] Figure 8 This is a top view of the rotary drive mechanism;

[0036] In the diagram: 1-Frame; 2-First rotating component; 21-Slide groove; 22-End cover; 23-First bearing; 24-Second bearing; 25-Gear ring; 3-Second rotating component; 31-First roller conveyor; 32-Second roller conveyor; 33-Transition roller conveyor; 34-Arc-shaped roller conveyor; 35-Support ring; 36-Flange; 4-Rotation drive mechanism; 41-Swing base; 42-Hinge seat; 43-Hinge column; 44-Swing frame; 45-Gear; 46-Hydraulic cylinder; 5-Power transmission mechanism; 51-Slider; 52-Slide rod; 53-Roller; 54-Limit stop; 55-Positioning block; 56-Compression spring; 57-Locking nut; 58-Limit ring; 6-Gear drive mechanism; 61-Gear motor; 62-First sprocket; 63-Second sprocket; 64-Chain; 65-Bolt tensioning device. Detailed Implementation

[0037] 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.

[0038] Example:

[0039] like Figures 1 to 8 As shown, a pre-rotation device for a piercing machine top rod includes a frame 1, a first rotating component 2, a second rotating component 3, and a rotary drive mechanism 4 for driving the first rotating component 2 to rotate. The frame 1 is fixedly mounted on the piercing machine. Specifically, a flange can be welded to one end of the frame 1 and another flange can be welded to one end of the piercing machine. The two flanges are fixedly connected by bolts.

[0040] The first rotating component 2 is rotatably mounted on the frame 1. Specifically, end caps 22 are bolted to both ends of the first rotating component 2, and the end caps 22 are rotatably connected to the frame via first bearings 23. Two second bearings 24 are provided between the outer surface of the second rotating component 3 and the inner surface of the first rotating component 2, so that the second rotating component 3 and the first rotating component 2 are coaxially mounted and can rotate relative to each other. The first bearings 23 and the second bearings 24 can reduce the frictional force when the first rotating component 2 and the second rotating component 3 rotate.

[0041] The outer surface of the second rotating component 3 is provided with a flange 36, which axially positions the two second bearings 24, thereby preventing the second rotating component 3 from moving axially relative to the first rotating component 2.

[0042] When the piercing machine is working, the push rod of the piercing machine passes through the second rotating part 3 and is circumferentially limited by the second rotating part 3. Specifically, it can be limited by a flat key or spline. The axial limit of the push rod is provided by the original piercing machine, and will not be described in detail here.

[0043] A power transmission mechanism 5 is provided between the second rotating part 3 and the first rotating part 2. When the first rotating part 2 rotates, the power transmission mechanism 5 drives the second rotating part 3 to rotate, which in turn drives the top rod to rotate. The rotation direction of the first rotating part 2 is opposite to the rotation direction of the bar stock.

[0044] When the mandrel contacts the bar stock, the reverse-rotating mandrel causes the mandrel to quickly bite into the bar stock, completing the centering process. The bar stock continues to rub against the mandrel, applying a reverse torque to the mandrel, causing the second rotating component 3 to gradually rotate with the bar stock, overcoming the torque applied by the power transmission mechanism 5.

[0045] The power transmission mechanism 5 includes a slider 51, a slide rod 52, and a roller 53. A first roller conveyor 31 and a second roller conveyor 32, coaxially aligned, are provided on the outer circumference of the second rotating member 3. The circumferential diameter of the second roller conveyor 32 is larger than that of the first roller conveyor 31. A transition roller conveyor 33 is provided on the side of the second roller conveyor 32 closest to the first roller conveyor 31. The first roller conveyor 31 and the transition roller conveyor 33 are connected by an arc-shaped roller conveyor 34. A groove 21 is provided axially on the side wall of the first rotating member 2. The slider 51 is slidably disposed within the groove 21. A circular through hole is provided in the middle of the slider 51. One end of the slide rod 52 is inserted into the circular through hole. A limit ring 58 is provided at the end of the slide rod 52. A limit stop 54, cooperating with the limit ring 58, is provided in the circular through hole. The slide rod 52 can both rotate and slide relative to the slider 51. The axis of the slide rod 52 points towards the axis of the first rotating member 2.

[0046] The roller 53 is rotatably mounted at the other end of the slide bar 52 and contacts the second rotating part 3. A positioning block 55 is provided in the middle of the slide bar 52. A compression spring 56 is provided between the positioning block 55 and the slider 51. The compression spring 56 drives the roller 53 to press the second rotating part 3.

[0047] In the initial state, the roller 53 is in contact with the first roller 31 of the second rotating member 3. When the first rotating member 2 rotates, the compression spring 56 applies pressure to the roller 53 so that it cannot pass through the arc-shaped roller 34 into the second roller 32. At this time, the tangential force applied by the roller 53 to the second rotating member 3 drives the second rotating member 3 to rotate, which in turn drives the push rod to rotate.

[0048] When the push rod contacts the bar stock, the reverse torque applied by the bar stock to the push rod gradually overcomes the elastic force of the compression spring 56. The roller 53 gradually enters the second roller track 32 along the arc-shaped roller track 34 and the transition roller track 33. When the roller 53 is located in the arc-shaped roller track 34, the slider 51 moves along the slide groove 21 as the roller 53 moves.

[0049] Since the second roller conveyor 32 is an annular roller conveyor, the torque applied by the roller 53 to the second rotating member 3 is very small. At this time, the second rotating member 3 mainly moves under the torque transmitted by the push rod, and the power transmission mechanism 5 hardly interferes with the movement of the second rotating member 3.

[0050] To ensure that the rollers can accurately enter the second roller conveyor 32, the curved roller conveyor 34 and the transition roller conveyor 33 are each provided with a guide side to guide the rollers 53 from the first roller conveyor 31 into the second roller conveyor 32.

[0051] In order to further reduce the torque exerted by the roller 53 on the second rotating member 3 when the top rod rotates with the bar stock, a support ring 35 is rotatably provided on the second rotating member 3, and the outer circular surface of the support ring 35 forms the second roller track 32.

[0052] The power transmission mechanism 5 has at least two, preferably three, evenly distributed along the circumference of the first rotating member 2.

[0053] In order to adjust the elastic force of the compression spring 56, the middle part of the slide rod 52 is a threaded rod, the positioning block 55 is a positioning nut that is threaded with the threaded rod, and a locking nut 57 is also provided on the threaded rod.

[0054] Preferably, the rotary drive mechanism 4 includes a swing base 41, a hinge seat 42, a hinge column 43, a swing frame 44, and a gear 45. The hinge seat 42 and the hinge column 43 are both fixedly mounted on the swing base 41. The middle part of the swing frame 44 is hinged to the upper end of the hinge column 43. A hydraulic cylinder 46 is hinged on the hinge seat 42. The piston rod of the hydraulic cylinder 46 is hinged to one end of the swing frame 44. The hydraulic cylinder 46 can adjust the angle of the swing frame 44.

[0055] Gear 45 is rotatably mounted on the other end of swing frame 44 via gear shaft. Gear ring 25 is fixedly connected to the outer circumference of first rotating part 2. Gear 45 can mesh with gear ring 25. The angle of swing frame 44 is adjusted by hydraulic cylinder 46 to control the meshing state of gear 45 and gear ring 25.

[0056] Gear 45 is connected to a gear drive mechanism 6, which includes a reduction motor 61 mounted on the upper side of the swing frame 44. A first sprocket 62 is mounted on the motor shaft of the reduction motor 61, and a second sprocket 63 is mounted on the gear shaft. The first sprocket 62 and the second sprocket 63 are connected by a chain 64. The reduction motor 61 drives the first sprocket 62 to rotate, which in turn drives the gear shaft and gear 45 to rotate via the chain 64 and the second sprocket 63.

[0057] The geared motor 61 is slidably mounted on the swing frame 44, and the swing frame 44 is equipped with a bolt tensioning device 65. The working end of the bolt tensioning device 65 is in contact with the geared motor 61, and the position of the geared motor 61 can be adjusted by the bolt tensioning device 65.

[0058] The above description only illustrates the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention, and all such changes should be included within the protection scope of the present invention.

Claims

1. A pre-rotation device for a perforating machine top rod, characterized in that: It includes a frame (1), a first rotating component (2), a second rotating component (3), and a rotary drive mechanism (4) that drives the first rotating component (2) to rotate. The first rotating part (2) is rotatably mounted on the frame (1), the second rotating part (3) is coaxially mounted with the first rotating part (2) and rotatably connected, a power transmission mechanism (5) is provided between the second rotating part (3) and the first rotating part (2), the frame (1) is fixedly mounted on the drilling machine, the top rod of the drilling machine passes through the second rotating part (3) and is circumferentially limited with the second rotating part (3); The power transmission mechanism (5) includes a slider (51), a slide bar (52) and a roller (53). The outer circumference of the second rotating part (3) is provided with a first roller track (31) and a second roller track (32) on the same axis. The circumferential diameter of the second roller track (32) is larger than the circumferential diameter of the first roller track (31). A transition roller track (33) is provided on the side of the second roller track (32) close to the first roller track (31). The first roller track (31) and the transition roller track (33) are connected by an arc-shaped roller track (34). The first rotating part (2) has a sliding groove (21) on its side wall along the axial direction. The slider (51) is slidably disposed in the sliding groove (21). A circular through hole is provided in the middle of the slider (51). One end of the sliding rod (52) is inserted into the circular through hole. A limit ring (58) is provided at the end of the sliding rod (52). A limit stop (54) that cooperates with the limit ring (58) is provided in the circular through hole. The roller (53) is rotatably mounted at the other end of the slide bar (52) and contacts the second rotating part (3). A positioning block (55) is provided in the middle of the slide bar (52), and a compression spring (56) is provided between the positioning block (55) and the slider (51). The arc-shaped roller track (34) and the transition roller track (33) are each provided with a guide edge to guide the roller (53) from the first roller track (31) into the second roller track (32). The axis of the slide bar (52) points to the axis of the first rotating part (2).

2. The pre-rotation device for the top rod of a perforating machine according to claim 1, characterized in that: The second rotating part (3) is provided with a support ring (35), and the outer surface of the support ring (35) forms the second roller track (32).

3. The pre-rotation device for the top rod of a perforating machine according to claim 1, characterized in that: The power transmission mechanism (5) has at least two parts evenly distributed along the circumference of the first rotating part (2).

4. The pre-rotation device for the top rod of a perforating machine according to claim 1, characterized in that: The middle part of the slide rod (52) is a threaded rod, the positioning block (55) is a positioning nut that is threaded with the threaded rod, and a locking nut (57) is also provided on the threaded rod.

5. The pre-rotation device for the top rod of a drilling machine according to claim 1, characterized in that: The first rotating part (2) has end caps (22) detachably connected to both ends, and the end caps (22) at both ends are rotatably connected to the frame through the first bearing (23); Two second bearings (24) are provided between the outer circular surface of the second rotating part (3) and the inner circular surface of the first rotating part (2). A flange (36) for axial positioning of the two second bearings (24) is provided on the outer circular surface of the second rotating part (3).

6. The pre-rotation device for the top rod of a drilling machine according to claim 1, characterized in that: The rotary drive mechanism (4) includes a swing base (41), a hinge seat (42), a hinge column (43), a swing frame (44), and a gear (45). The hinge seat (42) and the hinge column (43) are both fixedly mounted on the swing base (41). The middle part of the swing frame (44) is hinged to the upper end of the hinge column (43). A hydraulic cylinder (46) is hinged on the hinge seat (42). The piston rod of the hydraulic cylinder (46) is hinged to one end of the swing frame (44). The gear (45) is rotatably mounted on the other end of the swing frame (44) through a gear shaft. The gear (45) is connected to a gear drive mechanism (6). A gear ring (25) is fixedly connected to the outer circular surface of the first rotating part (2), and the gear (45) meshes with the gear ring (25).

7. The pre-rotation device for the top rod of a drilling machine according to claim 6, characterized in that: The gear drive mechanism (6) includes a reduction motor (61) mounted on the upper side of the swing frame (44). A first sprocket (62) is mounted on the motor shaft of the reduction motor (61), and a second sprocket (63) is mounted on the gear shaft. The first sprocket (62) and the second sprocket (63) are connected by a chain (64).

8. The pre-rotation device for the top rod of a perforating machine according to claim 7, characterized in that: The geared motor (61) is slidably mounted on the swing frame (44), and the swing frame (44) is provided with a bolt tensioning device (65), the working end of which is in contact with the geared motor (61).

9. The pre-rotation device for the top rod of a drilling machine according to claim 1, characterized in that: The second rotating part (3) is circumferentially limited to the push rod by a flat key or spline.

10. The pre-rotation device for the top rod of a drilling machine according to claim 1, characterized in that: A flange is welded to one end of the frame (1).

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