Pre-rotating device for ejector rod of perforating machine

Abstract

The invention relates to the technical field of perforating machines, in particular to a perforating machine ejector rod pre-rotating device which comprises a rack, a first rotating piece, a second rotating piece and a rotating driving mechanism for driving the first rotating piece to rotate. The first rotating part is rotationally arranged on the rack, the second rotating part and the first rotating part are coaxially arranged and rotationally connected, a power transmission mechanism is arranged between the second rotating part and the first rotating part and comprises a sliding block, a sliding rod and a pin roller, and a first roller way and a second roller way which are coaxial are arranged on the outer circumference of the second rotating part; the circumferential diameter of the second roller way is larger than that of the first roller way, a transition roller way is arranged on the side, close to the first roller way, of the second roller way, and the first roller way is connected with the transition roller way through an arc-shaped roller way. According to the invention, the power transmission mechanism is combined with the double-rotating member structure, so that the controllable reverse pre-rotation of the ejector rod and the automatic release of the torque after the engagement are realized. And the biting centering efficiency is obviously improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of piercing mill, more particularly, to a piercing mill ejector rod pre-rotation device. BACKGROUND

[0002] In the hot piercing process of seamless steel pipe, the ejector rod needs to quickly center the bar in the biting stage to reduce the wear of the top head and the vibration of the equipment. In the traditional piercing mill, the ejector rod is usually a passive rotating structure, which relies on the friction force of the bar to drive rotation, resulting in poor centering effect in the initial biting stage and serious top head eccentric wear.

[0003] The Chinese invention patent with application number 201810462292.9 discloses a high-precision piercing mill with ejector rod pre-rotation, which installs a pre-rotation mechanism on the traditional ejector rod and drives the mechanism to rotate by external force, so that the ejector rod pre-rotates along a track opposite to the rotation direction of the bar. When the top head of the ejector rod initially contacts the bar and performs the centering operation, the rotational inertia generated by the reverse rotation prompts the ejector rod to quickly and accurately embed into the bar.

[0004] Although this scheme can improve the centering effect of the ejector rod to some extent, the power transmission depends on the rollers in contact with the driving ring and the driven ring at the same time. When the ejector rod contacts the bar, the power transmission is immediately cut off, which makes it difficult to accurately ensure that the ejector rod bites into the bar.

[0005] Therefore, it is necessary to improve the prior art. SUMMARY

[0006] In order to overcome the deficiencies in the prior art, a piercing mill ejector rod pre-rotation device is provided.

[0007] In order to solve the above technical problems, the technical scheme adopted by the present application is as follows: A piercing mill ejector rod pre-rotation device, comprising a rack, a first rotary member, a second rotary member and a rotary drive mechanism for driving the first rotary member to rotate; The first rotary member is rotationally arranged on the rack, the second rotary member is coaxially arranged and rotationally connected with the first rotary member, a power transmission mechanism is arranged between the second rotary member and the first rotary member, the rack is fixedly arranged on the piercing mill, and the ejector rod of the piercing mill penetrates through the second rotary member and is circumferentially limited by the second rotary member; The power transmission mechanism comprises a sliding block, a sliding rod and a roller, the outer circumference of the second rotary member is provided with coaxial first and second roller tracks, the circumferential diameter of the second roller track is greater than that of the first roller track, the side of the second roller track close to the first roller track is provided with a transition roller track, and the first roller track and the transition roller track are connected through an arc-shaped roller track; The side wall of the first rotary member is provided with a sliding groove in the axial direction, the sliding block is slidingly arranged in the sliding groove, a circular through hole is arranged in the middle of the sliding block, a sliding rod is inserted into the circular through hole, a limiting ring is arranged at the end of the sliding rod, and a limiting stop is arranged in the circular through hole and matched with the limiting ring; The roller is rotatably arranged at the other end of the sliding rod and in contact with the second rotary member, a positioning block is arranged in the middle of the sliding rod, and a compression spring is arranged between the positioning block and the sliding block; the arc-shaped roller way and the transition roller way are both provided with a stop edge for guiding the guide roller to enter the second roller way from the first roller way.

[0008] Preferably, a supporting ring is rotatably arranged on the second rotary member, and the outer circular surface of the supporting ring forms the second roller way.

[0009] Preferably, the power transmission mechanism is circumferentially distributed on the first rotary member.

[0010] Preferably, the middle part of the sliding rod is a threaded rod, the positioning block is a positioning nut matched with the threaded rod in a threaded manner, and a locking nut is further arranged on the threaded rod.

[0011] Preferably, end covers are detachably connected to the two ends of the first rotary member, and the end covers at the two ends are rotatably connected to the rack through first bearings, respectively. Two second bearings are arranged between the outer circular surface of the second rotary member and the inner circular surface of the first rotary member, and a flange is arranged on the outer circular surface of the second rotary member and axially positions the two second bearings.

[0012] Preferably, the rotary driving mechanism comprises a swing base, a hinged seat, a hinged column, a swing frame and a gear, the hinged seat and the hinged column are fixedly arranged on the swing base, the middle part of the swing frame is hingedly connected to the upper end of the hinged column, a hydraulic oil cylinder is hingedly connected to the hinged seat, the piston rod of the hydraulic oil cylinder is hingedly connected to one end of the swing frame, and the gear is rotatably arranged at the other end of the swing frame through a gear shaft; the gear is connected with a gear driving mechanism. A gear ring is fixedly connected to the outer circular surface of the first rotary member, and the gear is engaged with the gear ring.

[0013] Preferably, the gear driving mechanism comprises a speed reducer motor arranged on the upper side of the swing frame, a first sprocket is arranged on the motor shaft of the speed reducer motor, a second sprocket is arranged on the gear shaft, and the first sprocket and the second sprocket are drivingly connected through a chain.

[0014] Preferably, the speed reducer motor is slidingly arranged on the swing frame, a bolt tensioning device is arranged on the swing frame, and the working end of the bolt tensioning device is in contact with the speed reducer motor.

[0015] Preferably, the second rotary member and the ejector rod are circumferentially limited by a spline or a spline.

[0016] Preferably, a flange is welded to one end of the rack.

[0017] The present application has the following advantages compared with the prior art: 1. The present application combines the power transmission mechanism with the double-rotation structure to realize the controllable reverse pre-rotation of the ejector rod and the automatic release of the post-torque after biting. In the initial stage, the compression spring pushes the roller to be pressed against the first roller, so that the reverse torque of the first rotation part is efficiently transmitted to the second rotation part to drive the ejector rod, thereby significantly improving the biting centering efficiency. After biting, the reverse torque of the bar pushes the roller to slide along the arc-shaped roller and the transition roller into the second roller. When the roller is located on the arc-shaped roller, the torque can still be transmitted to the ejector rod. After entering the second roller, the torque transmission is automatically released due to the circular structure of the second roller.

[0018] 2. The present application sets the slide rod on the sliding block. When the ejector rod moves axially along the arc-shaped roller, the slide rod and the roller can automatically move with it to prevent interference. The threaded rod and the positioning nut are combined to support the spring pre-tightening force adjustment, so that different pre-tightening forces can be selected according to the needs. BRIEF DESCRIPTION OF DRAWINGS

[0019] The specific embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the assembly of the first rotation part and the second rotation part of the present application. Figure 2 It is an exploded schematic diagram of the present application. Figure 3 It is a structural schematic diagram of one angle of the second rotation part. Figure 4 It is a structural schematic diagram of another angle of the second rotation part. Figure 5 It is a structural schematic diagram of the power transmission mechanism. Figure 6 It is a sectional view of the power transmission mechanism. Figure 7 It is a front view of the rotary drive mechanism. Figure 8 It is a top view of the rotary drive mechanism. 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

[0021] 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.

[0022] Example: 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] The power transmission mechanism 5 is arranged between the second rotary member 3 and the first rotary member 2, and when the first rotary member 2 rotates, the second rotary member 3 is driven to rotate by the power transmission mechanism 5, and then the ejector rod is driven to rotate, the rotation direction of the first rotary member 2 is opposite to the rotation direction of the bar.

[0027] When the ejector rod contacts the bar, the reverse rotation of the ejector rod makes the ejector head quickly bite into the bar, and the centering work is completed. The bar continuously rubs against the ejector head, and the ejector head is subjected to a reverse torque, so that the second rotary member 3 gradually rotates with the bar against the torque applied by the power transmission mechanism 5.

[0028] The power transmission mechanism 5 includes a sliding block 51, a sliding rod 52 and a roller 53. The second rotary member 3 is provided with a coaxial first roller 31 and a second roller 32 on the outer circumference. The circumference diameter of the second roller 32 is larger than that of the first roller 31. The second roller 32 is provided with a transition roller 33 near one side of the first roller 31. The first roller 31 and the transition roller 33 are connected by an arc-shaped roller 34. The side wall of the first rotary member 2 is provided with a sliding groove 21 in the axial direction. The sliding block 51 is slidingly arranged in the sliding groove 21. The middle part of the sliding block 51 is provided with a circular through hole. One end of the sliding rod 52 is inserted into the circular through hole. The end of the sliding rod 52 is provided with a limiting ring 58. The circular through hole is provided with a limiting stop 54 matched with the limiting ring 58. The sliding rod 52 can rotate relative to the sliding block 51 and can slide relative to the sliding block 51. The axis of the sliding rod 52 points to the axis of the first rotary member 2.

[0029] The roller 53 is rotatably arranged at the other end of the sliding rod 52 and in contact with the second rotary member 3. The middle part of the sliding rod 52 is provided with a positioning block 55. The positioning block 55 and the sliding block 51 are provided with a compression spring 56 therebetween. The compression spring 56 drives the roller 53 to press the second rotary member 3.

[0030] In the initial state, the roller 53 is in contact with the first roller 31 of the second rotary member 3. When the first rotary member 2 rotates, the compression spring 56 exerts a pressure on the roller 53 so that it cannot enter the second roller 32 through the arc-shaped roller 34. At this time, the tangential component force of the roller 53 on the second rotary member 3 drives the second rotary member 3 to rotate, and then drives the ejector rod to rotate.

[0031] When the ejector rod contacts the bar, the bar exerts a reverse torque on the ejector rod, which gradually overcomes the elastic force of the compression spring 56. The roller 53 gradually enters the second roller 31 along the arc-shaped roller 34 and the transition roller 33. When the roller 53 is located in the arc-shaped roller 34, the sliding block 51 moves along the sliding groove 21 with the movement of the roller 53.

[0032] Since the second roller table 31 is a circular roller table, the moment exerted on the second rotating part 3 by the roller 53 is very small, and at this time, the second rotating part 3 mainly moves under the moment transmitted by the top rod, and the power transmission mechanism 5 hardly interferes with the movement of the second rotating part 3.

[0033] In order to ensure that the roller can accurately enter the second roller table 31, the arc-shaped roller table 34 and one side of the transition roller table 33 are provided with a stop edge for guiding the roller 53 to enter the second roller table 32 from the first roller table 31.

[0034] In order to further reduce the moment exerted on the second rotating part 3 by the roller 53 when the top rod rotates with the bar, a supporting ring 35 is rotatably arranged on the second rotating part 3, and the outer circular surface of the supporting ring 35 forms the second roller table 32.

[0035] The power transmission mechanism 5 is uniformly distributed along the circumferential direction of the first rotating part 2.

[0036] In order to adjust the elastic force of the compression spring 56, the middle part of the sliding rod 52 is a threaded rod, the positioning block 55 is a positioning nut matched with the threaded rod, and the threaded rod is further provided with a locking nut 57.

[0037] Preferably, the rotary driving mechanism 4 comprises a swing base 41, a hinged seat 42, a hinged column 43, a swing frame 44 and a gear 45, the hinged seat 42 and the hinged column 43 are fixedly arranged on the swing base 41, the middle part of the swing frame 44 is hingedly connected to the upper end of the hinged column 43, the hinged seat 42 is hingedly connected with a hydraulic oil cylinder 46, the piston rod of the hydraulic oil cylinder 46 is hingedly connected to one end of the swing frame 44, and the hydraulic oil cylinder 46 can adjust the angle of the swing frame 44.

[0038] The gear 45 is rotatably arranged on the other end of the swing frame 44 through a gear shaft, the outer circular surface of the first rotating part 2 is fixedly connected with a gear ring 25, the gear 45 can be engaged with the gear ring 25, and the angle of the swing frame 44 is adjusted by the hydraulic oil cylinder 46 to control the engagement state of the gear 45 and the gear ring 25.

[0039] The gear 45 is connected with a gear driving mechanism 6, which comprises a speed reducer motor 61 arranged on the upper side of the swing frame 44, a first sprocket 62 arranged on the motor shaft of the speed reducer motor 61, a second sprocket 63 arranged on the gear shaft, and a chain 64 transmissionally connected between the first sprocket 62 and the second sprocket 63. The speed reducer motor 61 drives the first sprocket 62 to rotate, and then drives the gear shaft and the gear 45 to rotate through the chain 64 and the second sprocket 63.

[0040] The speed reducer motor 61 is slidably arranged on the swing frame 44, and the swing frame 44 is provided with a bolt tensioning device 65, the working end of the bolt tensioning device 65 is in contact with the speed reducer motor 61, and the position of the speed reducer motor 61 can be adjusted by the bolt tensioning device 65.

[0041] The preferred embodiments of the present application have been disclosed above, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application, and all such changes should be included in the scope of the present application.

Claims

1. A piercing machine ejector rod pre-rotation device characterized by: The utility model relates to a perforating machine, including frame (1), first rotary piece (2), second rotary piece (3) and drive first rotary piece (2) rotation's rotation drive mechanism (4). The first rotary piece (2) is rotationally arranged on the frame (1), the second rotary piece (3) is coaxially arranged with the first rotary piece (2) and rotationally connected, a power transmission mechanism (5) is arranged between the second rotary piece (3) and the first rotary piece (2), the frame (1) is fixedly arranged on a perforating machine, a ejector rod of the perforating machine penetrates the second rotary piece (3) and is circumferentially limited with the second rotary piece (3). The power transmission mechanism (5) includes a sliding block (51), a sliding rod (52) and a roller (53), the second rotary piece (3) is provided with a first roller way (31) and a second roller way (32) coaxially on the outer circumference, the circumferential diameter of the second roller way (32) is greater than that of the first roller way (31), the second roller way (32) is provided with a transition roller way (33) on the side close to the first roller way (31), and the first roller way (31) and the transition roller way (33) are connected through an arc-shaped roller way (34). The side wall of the first rotary piece (2) is provided with a sliding groove (21) in the axial direction, the sliding block (51) is slidingly arranged in the sliding groove (21), a circular through hole is formed in the middle of the sliding block (51), one end of the sliding rod (52) is inserted into the circular through hole, a limiting ring (58) is arranged at the end of the sliding rod (52), and a limiting stop (54) matched with the limiting ring (58) is arranged in the circular through hole. The roller (53) is rotationally arranged at the other end of the sliding rod (52) and is in contact with the second rotary piece (3), a positioning block (55) is arranged in the middle of the sliding rod (52), and a compression spring (56) is arranged between the positioning block (55) and the sliding block (51); one side of the arc-shaped roller way (34) and the transition roller way (33) is provided with a stop edge for guiding the roller (53) to enter the second roller way (32) from the first roller way (31).

2. A pre-rotation device for a punch ejector rod according to claim 1, characterized in that: A supporting ring (35) is rotationally arranged on the second rotary piece (3), and the outer circular surface of the supporting ring (35) forms the second roller way (32).

3. A pre-rotation device for a punch ejector rod according to claim 1, characterized in that: The power transmission mechanism (5) is uniformly distributed along the circumference of the first rotary piece (2) and has at least two.

4. A pre-rotation device for a punch ejector rod as defined in claim 1, wherein: The middle part of the sliding rod (52) is a threaded rod, the positioning block (55) is a positioning nut matched with the threaded rod in a threaded manner, and a locking nut (57) is further arranged on the threaded rod.

5. A pre-rotation device for a punch ejector rod as defined in claim 1, wherein: The first rotary piece (2) is detachably connected with end covers (22) at both ends, and the end covers (22) at both ends are rotationally connected with the frame through first bearings (23) respectively. Two second bearings (24) are arranged between the outer circular surface of the second rotary piece (3) and the inner circular surface of the first rotary piece (2), and a flange (36) is arranged on the outer circular surface of the second rotary piece (3) to axially position the two second bearings (24).

6. A pre-rotation device for a punch ejector rod as defined in claim 1, wherein: The rotating driving mechanism (4) comprises a swing base (41), a hinged seat (42), a hinged column (43), a swing frame (44) and a gear (45), the hinged seat (42) and the hinged column (43) are fixedly arranged on the swing base (41), the swing frame (44) is hingedly arranged at the upper end of the hinged column (43), the hinged seat (42) is hingedly arranged with a hydraulic oil cylinder (46), the piston rod of the hydraulic oil cylinder (46) is hingedly arranged with one end of the swing frame (44), and the gear (45) is rotatably arranged at the other end of the swing frame (44) through a gear shaft; the gear (45) is connected with a gear driving mechanism (6). A gear ring (25) is fixedly connected to the outer circumferential surface of the first rotary member (2), and the gear (45) is engaged with the gear ring (25).

7. A pre-rotation device for a punch ejector rod according to claim 6, characterized in that: The gear driving mechanism (6) comprises a speed reducer motor (61) arranged on the upper side of the swing frame (44), a first sprocket (62) is arranged on the motor shaft of the speed reducer motor (61), a second sprocket (63) is arranged on the gear shaft, and the first sprocket (62) and the second sprocket (63) are drivingly connected through a chain (64).

8. A pre-rotation device for a punch ejector rod according to claim 7, characterized in that: The speed reducer motor (61) is slidingly arranged on the swing frame (44), a bolt tensioning device (65) is arranged on the swing frame (44), and the working end of the bolt tensioning device (65) is in contact with the speed reducer motor (61).

9. A pre-rotation device for a punch ejector rod as defined in claim 1, wherein: The second rotary member (3) is circumferentially limited by a key or a spline with the ejector rod.

10. A pre-rotation device for a punch ejector rod as defined in claim 1, wherein: A flange plate is welded at one end of the rack (1).

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