A floating scale positioning jig

Abstract

The utility model discloses a kind of floating zoom positioning clamps, belong to machining positioning clamp technical field, including rotary table machine body, hollow hydraulic three-jaw self-centering chuck, positioning shell, workpiece tightening sleeve, preloaded spring, positioning cylinder, chuck clamping oil cylinder, clamping oil cylinder pull rod, cylinder pull rod, rotary table rotating table, cylinder support, chuck transition disc and drill pipe workpiece, rotary table main shaft, the hollow hydraulic three-jaw self-centering chuck is fixedly installed in the side of rotary table rotating table;By setting positioning cylinder, chuck clamping oil cylinder, rotary table machine body, hollow hydraulic three-jaw self-centering chuck and preloaded spring cooperation use, preloaded spring can absorb butt impact force, improve service life, avoid abrasion loss caused by rigid impact, axial, radial and angle floating compensation cooperation use, improve chip flute machining size precision, the setting of detachable workpiece tightening sleeve facilitates quick changeover, improve operation efficiency, hexagonal structure design, improve clamping effect, avoid loosening.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing positioning fixture technology, specifically relating to a floating scaling positioning fixture. Background Technology

[0002] In the production of drill pipe workpieces, the machining of the external chip removal grooves on the pipe wall is a crucial process to ensure the chip removal performance of the drill pipe workpiece. Because drill pipe workpieces need to adapt to different geological conditions, their ends generally use large-diameter tapered threads, and the thread type, such as thread profile, taper, and length, exists in various specifications. During automated machining, the drill pipe workpiece is threaded into the machining fixture. At this time, the machine's rotational speed and axial feed rate need to be dynamically adjusted according to the thread type. If the control precision is insufficient, it can easily lead to hard collisions between the drill pipe workpiece and the fixture, seriously affecting the machine's lifespan and the quality and machining accuracy of the drill pipe workpiece. Utility Model Content

[0003] The purpose of this invention is to provide a floating scaling positioning fixture to solve the problems of hard damage to equipment and low positioning accuracy caused by the lack of buffer and floating structure in existing drill pipe workpiece processing fixtures mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a floating scaling positioning fixture, comprising a turntable body, a hollow hydraulic three-jaw self-centering chuck, a positioning housing, a workpiece tightening sleeve, a preload spring, a positioning cylinder, a chuck clamping cylinder, a clamping cylinder rod, a cylinder rod, a turntable rotating surface, a cylinder support, a chuck transition plate and a drill rod workpiece, and a turntable spindle. The hollow hydraulic three-jaw self-centering chuck is fixedly installed on the side of the turntable rotating surface. The chuck transition plate is fixed to the front end face of the hollow hydraulic three-jaw self-centering chuck and is used to connect the positioning housing and the chuck body. The positioning housing is fitted outside the chuck transition plate, forming an axial and radial rotational floating structure. The workpiece tightening sleeve passes through the central hole of the positioning housing, with one end connected to the preload spring and the other end... The device is equipped with a tapered thread adapted to the drill pipe workpiece. The free end of the preload spring is fixed to the inner end wall of the positioning housing to provide axial buffer force when the workpiece tightening sleeve contacts the drill pipe workpiece. The positioning cylinder is fixed to the rear end of the hollow hydraulic three-jaw self-centering chuck cylinder through a cylinder support. Its output end is connected to the positioning housing through a cylinder rod to drive the positioning housing to move axially. The chuck clamping cylinder is installed at the rear end of the turntable body. Its output end is connected to the jaws on the hollow hydraulic three-jaw self-centering chuck through a clamping cylinder rod to control the jaws to retract or open radially to clamp or loosen the outer wall of the workpiece tightening sleeve. The outer wall of the workpiece tightening sleeve has a hexagonal structure to receive the rotational torque of the external rotating device to achieve threaded fastening with the drill pipe workpiece.

[0005] The above solution utilizes a positioning cylinder, a chuck clamping cylinder, a turntable body, a hollow hydraulic three-jaw self-centering chuck, and a preload spring. The preload spring absorbs the impact force during docking, extending service life and preventing wear and tear caused by hard impacts. Axial, radial, and angular floating compensations are used to improve the dimensional accuracy of the chip removal groove. The detachable workpiece tightening sleeve facilitates quick changes and improves work efficiency. The hexagonal structure design enhances the clamping effect and prevents loosening.

[0006] In one preferred embodiment, the workpiece tightening sleeve is a replaceable structure. The specifications of its inner tapered thread are designed according to the diameter and thread type of the drill rod workpiece, and the distance between opposite sides of the hexagonal structure on the outer wall is uniform to adapt to the torque output end of the same rotary device.

[0007] By adopting the above solution, the efficiency of changeover operations is improved through quick-change tapered threads, and the hexagonal interface is standardized, making the unified device compatible with multiple specifications, avoiding the cost investment of multiple specification devices, and improving the universality of use.

[0008] In a preferred embodiment, the positioning housing and the chuck transition plate are fitted together with a clearance fit, and the inner wall of the positioning housing is provided with a wear-resistant coating. Axial floating is achieved through the clearance fit and coating lubrication to compensate for positional deviations when the drill rod workpiece is docked.

[0009] The above scheme, with its clearance fit, facilitates easy alignment and assembly. The wear-resistant coating reduces frictional resistance, making the floating process smoother.

[0010] In a preferred embodiment, the preloaded spring is a cylindrical helical compression spring, which yields and deforms when subjected to axial force, thus forming a buffer.

[0011] By adopting the above solution, the use of cylindrical helical compression springs can improve the stability of the cushioning effect.

[0012] As a preferred embodiment, the inner side of the jaws of the hollow hydraulic three-jaw self-centering chuck is provided with an arc-shaped clamping surface, and the clamping surface is covered with a wear-resistant rubber layer. When clamping the workpiece tightening sleeve, the contact pressure is evenly distributed on the plane of the hexagonal structure, avoiding damage to the outer wall of the workpiece tightening sleeve.

[0013] The above solution uses an arc-shaped clamping surface in conjunction with a wear-resistant rubber layer to avoid direct metal-to-metal friction and wear, and to improve the stability of the clamping effect.

[0014] In a preferred embodiment, the hollow hydraulic three-jaw self-centering chuck is fixed to the rotary table surface by bolts, and moves axially and rotates with the worktable to meet the feed and speed requirements of the groove machining.

[0015] The above solution facilitates disassembly and assembly, meeting the needs of actual processing.

[0016] In a preferred embodiment, the connection end between the cylinder rod and the positioning housing is provided with a ball joint structure, which allows the positioning housing to generate angular deviations during the floating process, thereby further improving the position compensation capability.

[0017] By adopting the above scheme, the ball joint structure allows for a slight angle of inclination between the drill pipe workpiece and the positioning housing, avoiding thread seizing and better meeting the requirements of multi-directional floating.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This floating scaling positioning fixture uses a positioning cylinder, a chuck clamping cylinder, a turntable body, a hollow hydraulic three-jaw self-centering chuck, and a preload spring in combination. The preload spring can absorb the impact force of docking, extend service life, and avoid wear and tear caused by hard impacts. Axial, radial, and angular floating compensation are used in combination to improve the machining dimensional accuracy of the chip removal groove. The detachable workpiece tightening sleeve facilitates quick changeover and improves work efficiency. The hexagonal structure design improves the clamping effect and prevents loosening. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0022] In the diagram: 1. Positioning cylinder; 2. Cylinder support; 3. Chuck clamping cylinder; 4. Turntable body; 5. Turntable rotating surface; 6. Hollow hydraulic three-jaw self-centering chuck; 7. Cylinder tie rod; 8. Preload spring; 9. Chuck transition plate; 10. Positioning housing; 11. Workpiece tightening sleeve; 12. Workpiece; 13. Clamping cylinder tie rod. Detailed Implementation

[0023] Please see Figure 1-2This utility model provides a floating scaling positioning fixture, including a turntable body (4), a hollow hydraulic three-jaw self-centering chuck 6, a positioning housing 10, a workpiece 12 tightening sleeve 11, a preload spring 8, a positioning cylinder 1, a chuck clamping cylinder 3, a clamping cylinder rod 13, a cylinder rod 7, a cylinder support 2, a chuck transition plate 9, and a drill rod workpiece 12; the turntable table 5 is mounted on the turntable spindle 14, the hollow hydraulic three-jaw self-centering chuck 6 is fixedly mounted on the table 5 of the turntable 4, and the chuck transition plate 9 is fixed to the front end face of the hollow hydraulic three-jaw self-centering chuck 6 for connecting the positioning housing 10 to form an axial and radial rotating floating structure, the workpiece 12 tightening sleeve 11 passes through the center hole of the positioning housing 10, one end of which is connected to the preload spring 8, and the other end is provided with a tapered thread adapted to the drill rod workpiece 12, the free of the preload spring 8 The end is fixed to the inner end wall of the positioning housing 10, and is used to provide axial buffer force when the workpiece 12 tightening sleeve 11 contacts the drill rod workpiece 12. The positioning cylinder 1 is fixed to the rear end of the hollow hydraulic three-jaw self-centering chuck 6 through the cylinder support 2. Its output end is connected to the positioning housing 10 through the cylinder rod 7, and is used to drive the positioning housing 10 to move axially. The chuck clamping cylinder 3 is installed at the rear end of the rotary table spindle 14. Its output end is connected to the jaws on the hollow hydraulic three-jaw self-centering chuck 6 through the clamping cylinder rod 13, and is used to control the jaws to retract or open radially to clamp or loosen the outer wall of the workpiece 12 tightening sleeve 11. The outer wall of the workpiece 12 tightening sleeve 11 has a hexagonal structure, which is used to receive the rotational torque of the external rotary device to achieve thread fastening with the drill rod workpiece 12. It can also drive the workpiece to rotate and position for convenient drilling.

[0024] By using a positioning cylinder 1, a chuck clamping cylinder 3, a turntable 5, a hollow hydraulic three-jaw self-centering chuck 6, and a preload spring 8, the preload spring 8 can absorb the impact force of docking, improve service life, and avoid wear and tear caused by hard impact. The axial, radial, and angular floating compensation work together to improve the machining dimensional accuracy of the chip removal groove. The detachable workpiece 12 tightening sleeve 11 facilitates quick changeover and improves work efficiency. The hexagonal structure design improves the clamping effect and prevents loosening.

[0025] The tightening sleeve 11 of the workpiece 12 is a replaceable structure. The specifications of its inner tapered thread are designed according to the diameter and thread type of the drill rod workpiece 12. The distance between opposite sides of the hexagonal structure on the outer wall is uniform to adapt to the torque output end of the same rotary device. The quick-change tapered thread improves the efficiency of the changeover operation. The hexagonal interface is standardized, making the unified device compatible with multiple specifications, avoiding the cost investment of multiple specification devices, and improving the universality of use.

[0026] The positioning housing 10 and the chuck transition plate 9 are fitted together with a clearance fit, and the inner wall of the positioning housing 10 is provided with a wear-resistant coating. Axial floating is achieved through clearance fit and coating lubrication to compensate for positional deviation when the drill rod workpiece 12 is docked. The clearance fit setting facilitates alignment and assembly, and the wear-resistant coating can reduce frictional resistance, making floating smoother.

[0027] The preload spring 8 is a cylindrical helical compression spring that yields when subjected to axial force, forming a buffer. The use of cylindrical helical compression springs can improve the stability of the buffering effect.

[0028] The hollow hydraulic three-jaw self-centering chuck 6 has an arc-shaped clamping surface on the inner side of the jaws, and the clamping surface is covered with a wear-resistant rubber layer. When clamping the workpiece 12 and tightening sleeve 11, the contact pressure is evenly distributed on the plane of the hexagonal structure, avoiding damage to the outer wall of the workpiece 12 and tightening sleeve 11. The arc-shaped clamping surface, in conjunction with the wear-resistant rubber layer, avoids direct metal-to-metal friction and wear, and improves the stability of the clamping effect.

[0029] The hollow hydraulic three-jaw self-centering chuck 6 is fixed to the rotary table 5 by bolts and rotates with the rotary table spindle 14 to meet the speed requirements of the groove removal machining. The chuck body moves axially as a whole to meet the feed requirements of the groove removal machining and meet the actual machining requirements.

[0030] The connection end between the cylinder rod 7 and the positioning housing 10 is provided with a ball joint structure, which allows the positioning housing 10 to generate angular deviation during the floating process, further improving the position compensation capability. The ball joint structure allows for slight angular tilt between the drill rod workpiece 12 and the positioning housing 10, avoiding thread seizure and better meeting the multi-directional floating requirements.

[0031] In this embodiment, the parameters of each component of the floating scaling positioning fixture are as follows: the hollow hydraulic three-jaw self-centering chuck 6 is model K520, the positioning cylinder 1 is a standard cylinder with a cylinder diameter of 50mm, the stiffness of the preload spring 8 is 20N / mm, the yield stroke is 10mm, the tightening sleeve 11 of the workpiece 12 is made of 45 steel, and is suitable for four specifications of drill rod workpieces 12 with diameters of 70mm, 90mm, 110mm and 130mm. The distance between opposite sides of the hexagonal structure of its outer wall is 60mm.

[0032] During operation, the automatic feeding mechanism transports the 90mm diameter drill rod workpiece 12 to the positioning position and clamps it; the turntable body 4 drives the fixture to move axially, the workpiece 12 tightening sleeve 11 contacts the end of the drill rod workpiece 12 and drives the preload spring 8 to compress and deform. After the preload spring 8 is compressed by 8mm, it stops moving, and then the turntable spindle 14 passes through the rotating table 5. The three-jaw chuck 6 and the hexagonal structure transmit a torque of 500 N·m, which secures the workpiece 12 tightening sleeve 11 to the drill rod workpiece 12 with a tapered thread. Then, the loading mechanism releases, and the positioning cylinder 1 is activated to pull the drill rod workpiece 12 back to the fixture positioning surface. The chuck clamping cylinder 3 drives the jaws on the hollow hydraulic three-jaw self-centering chuck 6 to clamp the workpiece 12 tightening sleeve 11 with a force of 30 kN. Subsequently, the fixture rotates with the rotary table spindle 14, driving the drill rod workpiece 12 to perform groove machining. During the machining process, the axial feed speed is 50 mm / min and the rotation speed is 300 r / min. After the machining is completed, the drill rod workpiece 12 returns to the loading position, the loading mechanism clamps the drill rod workpiece 12, the jaws release, the fixture rotates 180° in the reverse direction, and the worktable retracts 500 mm to the waiting position, completing one machining cycle.

Claims

1. A floating scaling positioning fixture, characterized in that: The components include a rotary table body (4), a hollow hydraulic three-jaw self-centering chuck (6), a positioning housing (10), a workpiece tightening sleeve (11), a preload spring (8), a positioning cylinder (1), a chuck clamping cylinder (3), a clamping cylinder pull rod (13), a cylinder pull rod (7), a rotary table surface (5), a cylinder support (2), a chuck transition plate (9), a drill rod workpiece (12), and a rotary table spindle (14). The hollow hydraulic three-jaw self-centering chuck (6) is fixedly installed on the rotary table. On the side of the rotating table (5), the chuck transition plate (9) is fixed to the front end face of the hollow hydraulic three-jaw self-centering chuck (6) and is used to connect the positioning housing (10) and the chuck body. The positioning housing (10) is fitted outside the chuck transition plate (9) to form an axial and radial rotation floating structure. The workpiece (12) tightening sleeve (11) passes through the center hole of the positioning housing (10), one end of which is connected to the preload spring (8), and the other end is provided with a fitting that is suitable for the drill rod workpiece (12). The preload spring (8) is fixed to the inner end wall of the positioning housing (10) with a tapered thread. It is used to provide axial buffer force when the workpiece (12) tightening sleeve (11) contacts the drill rod workpiece (12). The positioning cylinder (1) is fixed to the rear end of the hollow hydraulic three-jaw self-centering chuck cylinder (3) through the cylinder support (2). Its output end is connected to the positioning housing (10) through the cylinder tie rod (7) to drive the positioning housing (10) to move axially. The chuck clamping cylinder (3) is installed at the rear end of the turntable body (4). Its output end is connected to the jaws on the hollow hydraulic three-jaw self-centering chuck (6) through the clamping cylinder pull rod (13). It is used to control the jaws to contract or open radially to clamp or loosen the outer wall of the workpiece (12) tightening sleeve (11). The outer wall of the workpiece (12) tightening sleeve (11) is provided with a hexagonal structure to receive the rotational torque of the external rotary device and realize the thread fastening with the drill rod workpiece (12).

2. The floating scaling positioning fixture according to claim 1, characterized in that: The tightening sleeve (11) of the workpiece (12) is a replaceable structure. The specifications of its inner tapered thread are designed according to the diameter and thread type of the drill rod workpiece (12), and the distance between opposite sides of the hexagonal structure on the outer wall is uniform, so as to adapt to the torque output end of the same rotary device.

3. The floating scaling positioning fixture according to claim 1, characterized in that: The positioning housing (10) and the chuck transition plate (9) are fitted together with a clearance fit, and the inner wall of the positioning housing (10) is provided with a wear-resistant coating. Axial floating is achieved through clearance fit and coating lubrication to compensate for the positional deviation when the drill rod workpiece (12) is docked.

4. The floating scaling positioning fixture according to claim 1, characterized in that: The preload spring (8) is a cylindrical helical compression spring that yields and deforms when subjected to axial force, thus forming a buffer.

5. The floating scaling positioning fixture according to claim 1, characterized in that: The hollow hydraulic three-jaw self-centering chuck (6) has an arc-shaped clamping surface on the inner side of the jaws, and the clamping surface is covered with a wear-resistant rubber layer. When clamping the workpiece (12) and tightening sleeve (11), the contact pressure is evenly distributed on the plane of the hexagonal structure, avoiding damage to the outer wall of the workpiece (12) and tightening sleeve (11).

6. The floating scaling positioning fixture according to claim 1, characterized in that: The hollow hydraulic three-jaw self-centering chuck (6) is fixed to the rotary table surface (5) by bolts, and moves axially and rotates with the worktable to meet the feed and speed requirements of the chip removal groove processing.

7. The floating scaling positioning fixture according to claim 1, characterized in that: The cylinder rod (7) is connected to the positioning housing (10) by a ball joint structure, which allows the positioning housing (10) to generate angular deviations during floating, thereby further improving the position compensation capability.

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