Floating clamping jaw capable of quickly changing specifications during petroleum pipe thread machining

Abstract

The utility model belongs to the technical field of special equipment for petroleum pipe processing, and relates to a floating jaw for quickly changing specifications during petroleum pipe thread processing, which comprises a chuck, three T-shaped chutes are arranged on the outer side of the chuck, T-shaped sliders are slidably connected in the T-shaped chutes, and fastening screw holes are arranged on the end faces of the T-shaped sliders. By means of mutual matching of the multi-station clamping jaws, the clamping arcs, the base jaw plates, the mounting grooves, the pin shafts and the like, when petroleum pipes of different models are machined, the clamping arcs matched with the petroleum pipes can be selected by rotating the multi-station clamping jaws, the multi-station clamping jaws can be suitable for the petroleum pipes of more models through the clamping arcs of different sizes, and the machining efficiency is improved. In this way, when the model of the petroleum pipe is replaced, the petroleum pipe can be clamped without disassembling the clamping jaw, the problem that the clamping jaw replacement time is long is effectively solved, in addition, due to the fact that the clamping arc is arranged in an arc shape, the petroleum pipe clamping area can be increased, and the problem that the petroleum pipe is damaged by clamping is avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of special equipment for processing oil pipes, and relates to a floating clamping claw for quickly changing specifications during oil pipe thread processing. Background Art

[0002] In the field of oil pipe thread processing, the jaws are the core components for clamping oil pipes, and their structural design directly affects the processing efficiency and workpiece quality. At present, pneumatic chuck jaws are generally used in the industry to complete the clamping operation. This type of jaws is connected to the jaw seat through a T-nut. During assembly, the T-nut needs to be embedded in the T-slot of the jaw seat, and then the jaws and T-nuts are fixed with bolts. Although this connection structure can meet basic clamping needs, it has significant limitations in the specification conversion scenario. When processing oil pipes of different diameters and wall thicknesses, the fixing bolts of the jaws and T-nuts need to be removed first, and then the T-nuts need to be pulled out of the jaw seat groove. The entire replacement process requires the cooperation of at least two operators to complete. The replacement time of a single set of jaws is relatively long. For production lines that need to process dozens of specifications of oil pipes on a daily basis, frequent specification conversions will lead to a serious compression of the effective processing time of the equipment.

[0003] At the same time, existing pneumatic chuck jaws mostly utilize a monolithic hardened jaw design, offering excellent rigidity. However, oil pipes are typically thin-walled tubular workpieces, and high-rigidity jaws are prone to the following issues when clamping. When the jaws contact the outer diameter of the tubing, the clamping force is concentrated at this localized point. Improper clamping force can easily cause radial deformation of the tubing. This deformation not only causes dimensional deviations in subsequent threading but can also lead to stress concentration on the tubing's inner wall, potentially creating a risk of fatigue fracture during use. To reduce deformation, some manufacturers have attempted to optimize the clamping force by manually adjusting it, but this method relies on operator experience, suffers from poor stability, and further reduces production efficiency. Utility Model Content

[0004] The technical problem to be solved by the present invention is that the replacement time of a single set of jaws is relatively long. For a production line that needs to process dozens of specifications of oil pipes on a daily basis, frequent specification conversions will lead to a serious compression of the effective processing time of the equipment. In addition, the jaws of existing pneumatic chucks mostly adopt an integral hard jaw design with excellent rigidity. However, oil pipes are typical thin-walled tubular workpieces, and the high-rigidity jaws are prone to the following problems when clamping. When the jaws contact the outer circle of the oil pipe, the clamping force will be concentrated on the local contact point. If the clamping force is not properly controlled, it is very easy to cause radial deformation of the oil pipe.

[0005] The utility model discloses a floating clamping jaw for quickly changing specifications during thread processing of petroleum pipes, comprising a chuck, wherein the outer side of the chuck is provided with three T-shaped slots, wherein a T-shaped slider is slidably connected in the T-shaped slots, and the end surface of the T-shaped slider is provided with a fastening screw hole;

[0006] A base jaw assembly is located on the end surface of the chuck. The base jaw assembly includes three base jaw plates. The base jaw assembly also includes a positioning mechanism, which is used in conjunction with the base jaw assembly.

[0007] Preferably, the base jaw assembly includes a multi-station jaw, a clamping arc, a rectangular groove and a mounting groove. A mounting groove is provided on the side of the base jaw plate opposite to the center of the chuck, and a multi-station jaw is provided inside the mounting groove. The outer side of the multi-station jaw is provided with evenly distributed clamping arcs, and the inner side of the clamping arc is provided with a rectangular groove.

[0008] Preferably, the base jaw assembly further includes a claw hole, a base jaw hole, a bushing, a pin shaft and a groove. A claw hole is provided near the center of the end face of the multi-station jaw, and a base jaw hole is provided on the end face of the base jaw plate. A bushing is installed inside the claw hole, and a pin shaft is installed inside the bushing. Both ends of the pin shaft extend into the base jaw hole, and a groove is provided at the end of the pin shaft away from the multi-station jaw.

[0009] Preferably, the positioning mechanism includes a positioning hole, an internal threaded hole, a metal cylinder, a wrench flat and an external thread. The end face of the base jaw plate away from the chuck is provided with an internal threaded hole, the internal threaded hole is connected to the inside of the mounting groove, a metal cylinder is provided on the inside of the internal threaded hole, the end of the metal cylinder is provided with an external thread near the base jaw plate, the external thread matches the internal threaded hole, and the end of the metal cylinder is provided with a wrench flat.

[0010] Preferably, the positioning mechanism also includes a positioning pin, a step, a hanging hole, a spring and a pull ring. A positioning pin is provided on the inner side of the metal tube, the bottom end of the positioning pin extends into the positioning hole, the end of the positioning pin is fixedly connected with a step near the multi-station claw, the end of the positioning pin is sleeved with a spring, the two ends of the spring are in contact with the metal tube and the step respectively, the end of the positioning pin away from the metal tube passes through the metal tube and is slidably connected to the metal tube, the end of the positioning pin away from the metal tube is symmetrically provided with hanging holes, and a pull ring is installed between the two hanging holes.

[0011] Furthermore, a thread hole is opened on the side of the base jaw plate opposite to the center of the chuck, the thread hole is connected to the inside of the base jaw hole, a set screw is installed inside the thread hole, one end of the set screw extends into the groove and conflicts with the inside of the groove.

[0012] Furthermore, two screw holes are provided on the end surface of the base jaw plate away from the chuck, and bolts are provided in the screw holes, and one end of the bolt extends into the fastening screw hole and matches therewith.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. Through the coordination among the multi-position jaws, clamping arc, base jaw plate, mounting slot and pin, it is possible to select the clamping arc that matches the oil pipe when processing different types of oil pipes by rotating the multi-position jaws. Clamping arcs of different sizes can be applied to more types of oil pipes. In this way, when changing the type of oil pipe, the oil pipe can be clamped without removing the jaws, effectively solving the problem of long jaw replacement time. In addition, because the clamping arc is set in an arc shape, it can increase the area for clamping the oil pipe, thereby avoiding the problem of oil pipe clamping damage.

[0015] 2. Through the mutual cooperation among the positioning hole, metal tube, positioning pin, spring, pull ring and internal threaded hole, it is possible to fix the multi-station clamping claw when the positioning pin is inserted into the positioning hole, so that the multi-station clamping claw will not rotate during processing, which plays a role in limiting the multi-station clamping claw. When the clamping arc needs to be changed, the pull ring can be pulled to drive the positioning pin out of the positioning hole, which effectively improves the stability of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic structural diagram of the utility model as a whole;

[0017] Figure 2 This is a schematic diagram of the exploded structure of the base claw assembly of the utility model;

[0018] Figure 3 This is a schematic diagram of the three-dimensional structure of the base claw assembly of the utility model;

[0019] Figure 4 This is a schematic structural diagram of the base claw assembly from another perspective of the present invention;

[0020] Figure 5 This is a schematic diagram of the cross-sectional structure of the base claw assembly of the utility model;

[0021] Figure 6 It is a structural diagram of the T-shaped slider in the utility model;

[0022] Figure 7 It is a structural schematic diagram of the positioning pin in the utility model.

[0023] In the figure: 1. Multi-position clamping jaw; 101. Clamping arc; 102. Rectangular groove; 103. Positioning hole; 104. Clamping jaw hole; 2. Set screw; 3. Pin; 301. Groove; 4. Bushing; 5. Spring; 6. Metal cylinder; 601. Wrench flat; 602. External thread; 7. Positioning pin; 701. Step; 702. Hanging hole; 8. Base jaw plate; 801. Screw hole; 802. Internal thread hole; 803. Mounting groove; 804. Base jaw hole; 805. Thread hole; 9. Pull ring; 10. Bolt; 11. Fastening screw hole; 12. T-shaped slider; 13. Chuck; 14. T-shaped slide groove. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein can be combined with each other.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] like Figures 1 to 7 As shown, it includes a chuck 13, three T-shaped slots 14 are provided on the outside of the chuck 13, a T-shaped slider 12 is slidably connected in the T-shaped slot 14, and a fastening screw hole 11 is provided on the end face of the T-shaped slider 12; a base jaw assembly, the base jaw assembly is located on the end face of the chuck 13, the base jaw assembly includes a base jaw plate 8, three base jaw plates 8 are provided, and the base jaw assembly also includes a positioning mechanism, which is used in conjunction with the base jaw assembly.

[0028] like Figures 1 to 5 As shown, the base jaw assembly includes a multi-station jaw 1, a clamping arc 101, a rectangular groove 102 and a mounting groove 803. The base jaw plate 8 is provided with a mounting groove 803 on the side opposite to the center of the chuck 13. The multi-station jaw 1 is provided inside the mounting groove 803. The outer side of the multi-station jaw 1 is provided with a uniformly distributed clamping arc 101, and the inner side of the clamping arc 101 is provided with a rectangular groove 102. The base jaw assembly also includes a jaw hole 104, a base jaw hole 804, a bushing 4, a pin 3 and a groove 301. The end face of the multi-station jaw 1 is provided with a jaw hole 104 near the center, the end face of the base jaw plate 8 is provided with a base jaw hole 804, and the inner side of the jaw hole 104 is provided with a The bushing 4 has a pin 3 installed on its inner side, both ends of the pin 3 extend into the base jaw hole 804, a groove 301 is provided at the end of the pin 3 away from the multi-station jaw 1, a threaded hole 805 is provided on the side of the base jaw plate 8 opposite to the center of the chuck 13, the threaded hole 805 is communicated with the inside of the base jaw hole 804, a set screw 2 is installed on the inside of the threaded hole 805, one end of the set screw 2 extends into the groove 301 and conflicts with the inner side of the groove 301, two screw holes 801 are provided on the end face of the base jaw plate 8 away from the chuck 13, a bolt 10 is provided in the screw hole 801, and one end of the bolt 10 extends into the fastening screw hole 11 and matches it.

[0029] like Figures 2 and 3As shown, the positioning mechanism includes a positioning hole 103, an internal threaded hole 802, a metal cylinder 6, a wrench flat 601 and an external thread 602. The end surface of the base jaw plate 8 away from the chuck 13 is provided with an internal threaded hole 802, the internal threaded hole 802 is connected to the inside of the mounting groove 803, and a metal cylinder 6 is provided inside the internal threaded hole 802. The end of the metal cylinder 6 is provided with an external thread 602 near the base jaw plate 8, and the external thread 602 matches the internal threaded hole 802. The end of the metal cylinder 6 is provided with a wrench flat 601. The positioning mechanism also includes a positioning pin 7 and a step 70 1. Hanging hole 702, spring 5 and pull ring 9. A locating pin 7 is provided on the inside of the metal cylinder 6. The bottom end of the locating pin 7 extends into the locating hole 103. The end of the locating pin 7 is fixedly connected with a step 701 near the multi-station claw 1. The end of the locating pin 7 is sleeved with a spring 5. The two ends of the spring 5 are in contact with the metal cylinder 6 and the step 701 respectively. The end of the locating pin 7 away from the metal cylinder 6 passes through the metal cylinder 6 and is slidably connected to the metal cylinder 6. The end of the locating pin 7 is symmetrically provided with hanging holes 702 away from the metal cylinder 6, and a pull ring 9 is installed between the two hanging holes 702.

[0030] The multi-station clamping jaw 1 in the present technical solution is provided with a plurality of clamping arcs 101, whose sizes are 4.5 inches, 5.0 inches, 5.5 inches, 6.0 inches, and 7.0 inches respectively. The number and arc size of the clamping arcs 101 can also be set according to actual conditions. In addition, when installing the multi-station clamping jaw 1, it is necessary to use the pin shaft 3 to be inserted between the clamping jaw hole 104 and the base jaw hole 804, and then use the set screw 2 to be installed in the wire hole 805. After tightening the set screw 2, it will enter the groove 301 and tightly contact the groove 301, so that the pin shaft 3 will not loosen or fall off during use, thereby improving the stability of use.

[0031] Working principle: When using this technical solution, first put the bolt 10 into the screw hole 801, and rotate the fastening screw hole 11 on the T-shaped slider 12 to connect with the bolt 10. Next, put the T-shaped slider 12 into the appropriate position in the T-shaped slide groove 14 and tighten the bolt 10. This will fix the position of the base claw plate 8 on the chuck 13. Next, when using, select the appropriate clamping arc 101 according to the model of the processed oil pipe. First, pull the locating pin 7 to compress the spring 5 through the pull ring 9, so that the locating pin 7 disengages from the locating hole 103. Then, the multi-station claw 1 can be rotated to face the clamping arc 101 of appropriate size to the center of the chuck 13. After the conversion is completed, release the pull ring 9. The rebound force of the synchronized spring 5 pushes the locating pin 7 into the locating hole 103, fixing the overall position of the multi-station claw 1, so that the multi-station claw 1 will not rotate during processing.

[0032] The description of the direction and relative position relationship of the structure in the present invention, such as the description of front, back, left, right, up and down, does not constitute a limitation of the present invention and is only for the convenience of description.

Claims

1. A floating jaw for quickly changing specifications during thread processing of petroleum pipes, comprising a chuck (13), characterized in that: Three T-shaped slots (14) are provided on the outside of the chuck (13), a T-shaped slider (12) is slidably connected in the T-shaped slots (14), and a fastening screw hole (11) is provided on the end surface of the T-shaped slider (12); A base jaw assembly is located on the end surface of a chuck (13), the base jaw assembly comprises a base jaw plate (8), three base jaw plates (8) are provided, and the base jaw assembly further comprises a positioning mechanism, the positioning mechanism is used in conjunction with the base jaw assembly.

2. The floating jaw for quickly changing specifications during thread processing of petroleum pipes according to claim 1 is characterized in that: The base jaw assembly comprises a multi-station clamping jaw (1), a clamping arc (101), a rectangular groove (102) and a mounting groove (803); a mounting groove (803) is provided on a side of the base jaw plate (8) opposite to the center of the chuck (13); a multi-station clamping jaw (1) is provided inside the mounting groove (803); uniformly distributed clamping arcs (101) are provided outside the multi-station clamping jaw (1); and a rectangular groove (102) is provided inside the clamping arc (101).

3. The floating jaw for quickly changing specifications during thread processing of petroleum pipes according to claim 2 is characterized in that: The base jaw assembly further comprises a jaw hole (104), a base jaw hole (804), a bushing (4), a pin shaft (3) and a groove (301). The end surface of the multi-station jaw (1) is provided with a jaw hole (104) near the center, the end surface of the base jaw plate (8) is provided with a base jaw hole (804), a bushing (4) is installed inside the jaw hole (104), a pin shaft (3) is installed inside the bushing (4), both ends of the pin shaft (3) extend into the base jaw hole (804), and a groove (301) is provided at the end of the pin shaft (3) away from the multi-station jaw (1).

4. The floating jaw for quickly changing specifications during thread processing of petroleum pipes according to claim 2 is characterized in that: The positioning mechanism comprises a positioning hole (103), an internal threaded hole (802), a metal cylinder (6), a wrench plane (601) and an external thread (602); an internal threaded hole (802) is provided on the end surface of the base jaw plate (8) away from the chuck (13); the internal threaded hole (802) is communicated with the interior of the mounting groove (803); a metal cylinder (6) is provided inside the internal threaded hole (802); an external thread (602) is provided at the end of the metal cylinder (6) near the base jaw plate (8); the external thread (602) matches the internal threaded hole (802); and a wrench plane (601) is provided at the end of the metal cylinder (6).

5. The floating jaw for quickly changing specifications during thread processing of petroleum pipes according to claim 4 is characterized in that: The positioning mechanism further comprises a positioning pin (7), a step (701), a hanging hole (702), a spring (5) and a pull ring (9). A positioning pin (7) is provided on the inner side of the metal cylinder (6). The bottom end of the positioning pin (7) extends into the positioning hole (103). The end of the positioning pin (7) is fixedly connected with the step (701) near the multi-station claw (1). The end of the positioning pin (7) is sleeved with a spring (5). The two ends of the spring (5) are in contact with the metal cylinder (6) and the step (701) respectively. The end of the positioning pin (7) away from the metal cylinder (6) passes through the metal cylinder (6) and is slidably connected to the metal cylinder (6). The end of the positioning pin (7) away from the metal cylinder (6) is symmetrically provided with hanging holes (702). A pull ring (9) is installed between the two hanging holes (702).

6. The floating jaw for quickly changing specifications during thread processing of petroleum pipes according to claim 3 is characterized in that: A thread hole (805) is formed on a side of the base jaw plate (8) opposite to the center of the chuck (13), the thread hole (805) being connected to the inside of the base jaw hole (804), a set screw (2) being installed inside the thread hole (805), one end of the set screw (2) extending into the groove (301) and contacting the inside of the groove (301).

7. The floating jaw for quickly changing specifications during thread processing of petroleum pipes according to claim 1 is characterized in that: Two screw holes (801) are provided on the end surface of the base claw plate (8) away from the chuck (13), and bolts (10) are arranged in the screw holes (801). One end of the bolt (10) extends into the fastening screw hole (11) and matches therewith.

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