Clamping device and method for thin-wall cylinder liner grinding of column automation equipment

Abstract

The application discloses a clamping device for a thin-wall cylinder sleeve grinder of a pipe column automation equipment, and the positioning mandrel is sequentially called a positioning boss, a flange plate, a high step, a low step and a polished rod from a large end to a polished rod end. The outer circular surface of the positioning boss is sleeved with a flange dial. An end face pressing disc is sleeved on the high step of the positioning mandrel. A first group of supporting and expanding units are sleeved on the low step of the positioning mandrel. A second group of supporting and expanding units are sleeved on the polished rod close to the outer end of the positioning mandrel. A plurality of wave-shaped expanding sleeves are sleeved on the polished rod between the two groups of supporting and expanding units. A pressing cylinder is fixed on the outer end surface of the polished rod. A piston rod of the pressing cylinder is fixedly connected with a pressing plate. The pressing plate is in contact with a pressing end cover inwardly. The inner end surface of the pressing end cover is in contact with the second group of supporting and expanding units. The application belongs to the technical field of drilling equipment manufacturing and solves the problem that the clamping of the thin-wall cylinder sleeve part is unreasonable in the prior art, which influences the manufacturing precision and efficiency of the thin-wall cylinder sleeve part.

Description

Technical Field

[0001] This invention belongs to the field of oil drilling equipment manufacturing technology, and relates to a clamping device for thin-walled cylinder liner grinding in automated tubing equipment. This invention also relates to a clamping method for thin-walled cylinder liner grinding in automated tubing equipment. Background Technology

[0002] Thin-walled cylinder liners are a common type of component in oil drilling equipment. However, due to their thin-walled, elongated hole structure, they are irregularly deformed parts. Given these structural characteristics, conventional manufacturing processes present challenges such as difficulty in clamping, control of machining deformation, and conversion between internal and external reference datums. The positioning accuracy of conventionally manufactured mandrels cannot meet the positioning and clamping requirements of thin-walled cylinder liners, frequently resulting in issues like concentricity between the inner and outer bores and excessive cylindricity of the entire part. This is particularly problematic in mass production, leading to inconvenient clamping, low production efficiency, and numerous manufacturing difficulties. Approximately 35% of the production time is spent on workpiece clamping and alignment, severely impacting the production cycle and manufacturing efficiency. Furthermore, it fails to effectively guarantee the machining accuracy of the cylinder liners and does not meet the requirements of lean manufacturing.

[0003] Therefore, it is urgent to develop new clamping devices to meet the machining accuracy requirements of such thin-walled cylinder liner parts, improve production efficiency, and ensure product quality. This has become an urgent problem to be solved. Summary of the Invention

[0004] The purpose of this invention is to provide a clamping device for grinding thin-walled cylinder liners in automated tubing equipment, which solves the problems of clamping thin-walled cylinder liner parts, the conversion of internal and external references in the grinding process of thin-walled cylinder liners, and the deformation problem of thin-walled cylinder liners during the grinding process in the prior art.

[0005] Another objective of this invention is to provide a clamping method for grinding thin-walled cylinder liners in automated tubing equipment, which solves the problem that the existing technology has unreasonable clamping of thin-walled cylinder liner parts, affecting the manufacturing accuracy and efficiency of thin-walled cylinder liner parts.

[0006] The technical solution adopted in this invention is a clamping device for thin-walled cylinder liner grinding in automated tubing equipment, including a positioning mandrel. The positioning mandrel is referred to as a positioning boss, flange, high step, low step and smooth rod from the large end to the smooth rod end. A flange dial is fitted on the outer circular surface of the positioning boss, and the flange dial is fixedly connected to the flange. An end face pressure plate is mounted on the high step of the positioning mandrel, and a first set of support and tensioning units is mounted on the low step of the positioning mandrel. A second set of support and tensioning units is mounted on the outer end of the guide rod of the positioning mandrel. Multiple wave-shaped expansion sleeves are mounted on the guide rod between the two sets of support and tensioning units. A clamping cylinder is fixed to the outer end face of the guide rod. A clamping plate is fixedly connected to the piston rod of the clamping cylinder. The clamping plate contacts the clamping end cover inward. The inner end face of the clamping end cover contacts the second set of support and tensioning units.

[0007] Another technical solution adopted in this invention is a clamping method for grinding thin-walled cylinder liners in automated tubing column equipment, which is implemented using a clamping device for grinding thin-walled cylinder liners in automated tubing column equipment according to the following steps: Step 1: Install the flange dial on the positioning boss of the positioning mandrel; Step 2: Install the end face pressure plate, two sets of support tensioning units, and waveform tensioning sleeve on the positioning mandrel; Step 3: Install the thin-walled cylinder liner and start the clamping cylinder to tighten the inner hole of the thin-walled cylinder liner; Step 4: Install the assembled device of the present invention and the thin-walled cylinder liner onto the grinding machine. Align the center hole of the positioning mandrel with the center point of the grinding machine spindle, align the center hole of the clamping plate with the center point of the grinding machine tailstock, pass the grinding machine lever through the turning hole on the flange dial, and securely connect the lever to the end of the grinding machine spindle.

[0008] The beneficial effects of this invention are as follows: by designing elastic grooves on the V-shaped elastic support plate, and distributing paired end-face limiting plates at both ends of the thin-walled cylinder liner, the V-shaped elastic support plate is confined within it. A corrugated expansion sleeve provides auxiliary support, and the axial clamping force of the clamping plate enables radial elastic deformation of the V-shaped elastic support plate and the corrugated expansion sleeve, thus solving the clamping problem of thin-walled cylinder liner parts. Furthermore, the axial clamping force of the clamping plate causes simultaneous radial elastic deformation of the V-shaped elastic support plates at both ends, achieving simultaneous axial automatic centering and clamping of the thin-walled cylinder liner parts at both ends, thus solving the grinding problem of thin-walled cylinder liner parts. The problem of inconsistent conversion between inner and outer diameter datums can be solved by grinding the outer diameter of thin-walled cylinder liner parts in a single clamping operation. The main components adopt a modular design, improving applicability and flexibility. Utilizing the pre-machined inner hole and end face of the thin-walled cylinder liner part as the positioning datum surface, the part is radially positioned by V-shaped elastic support plates at both ends. A corrugated expansion sleeve provides auxiliary support in the middle, and a clamping cylinder on the right end contracts to clamp the end cap and clamping plate, achieving axial positioning of the thin-walled cylinder liner part. This device is convenient and quick to install and use. By changing the V-shaped elastic support plates and corrugated expansion sleeves, it can meet the clamping and positioning needs of thin-walled cylinder liner parts of different specifications and lengths, effectively improving production efficiency, shortening the production cycle, and significantly reducing manufacturing costs. The parts used in this method have simple structures, are easy and quick to operate, and are highly safe. The manufacturing process meets HSE requirements. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall structure of the device of the present invention; Figure 2 This is a cross-sectional view of the flange dial in the device of the present invention; Figure 3 This is a cross-sectional view of the end face pressure plate in the device of the present invention; Figure 4 This is a cross-sectional view of the end face limiting disk in the device of the present invention; Figure 5 This is a schematic diagram of the structure of the V-shaped elastic support plate in the device of the present invention; Figure 6 This is a schematic diagram of the positioning mandrel in the device of the present invention; Figure 7 This is a cross-sectional view of the waveform expansion sleeve in the device of the present invention.

[0010] In the diagram, 1. Flange dial; 2. Screw; 3. End face pressure plate; 4. Cylinder liner; 5. End face limiting plate; 6. V-shaped elastic support plate; 7. Wave-shaped expansion sleeve; 8. Positioning mandrel; 9. Clamping end cover; 10. Clamping cylinder; 11. Clamping plate; 12. Clamping head; 13. Center hole; 14. Elastic groove; 15. V-shaped bevel; 16. Outer bevel protrusion; 17. Centering boss; 18. Limiting groove; 19. Axial positioning surface b; 20. Radial positioning surface b; 21. Hole stop; 22. Rotation hole; 23. Bolt hole; 24. Positioning boss; 25. Axial positioning surface a; 26. Radial positioning surface a; 27. Elastic groove; 28. Countersunk hole; 29. ​​Flange. Detailed Implementation

[0011] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0012] The directions above, below, left, and right mentioned in the following description are based on the attached diagrams showing the locations of the various components. The actual installation positions can be deduced accordingly.

[0013] Reference Figure 1 , Figure 6 The structure of the device of the present invention includes a positioning mandrel 8, which is sequentially referred to as a positioning boss 24, a flange 29, a high step, a low step, and a smooth rod from the large end (left end) to the smooth rod end (right end). A flange dial 1 is fitted on the outer circular surface of the positioning boss 24. The flange dial 1 is fixedly connected to the flange 29 by screws 2. The flange dial 1 is then connected to the end face of the machine tool spindle. The torque of the machine tool spindle is transmitted to the flange dial 1 through a lever, and the positioning mandrel 8 is rotated through the flange 29. An end face pressure plate 3 is mounted on the high step of the positioning mandrel 8, and a first set of support tensioning units is mounted on the low step of the positioning mandrel 8. A second set of support tensioning units is mounted on the outer end of the smooth rod of the positioning mandrel 8. Each set of support tensioning units consists of two end face limiting plates 5 and a V-shaped elastic support plate 6, and the V-shaped elastic support plate 6 is sandwiched between the two end face limiting plates 5. Multiple wave-shaped expansion sleeves 7 are mounted on the smooth rod between the two sets of support tensioning units. A clamping cylinder 10 is fixedly installed axially on the outer end face (rightmost end) of the smooth rod of the positioning mandrel 8. The piston rod of the clamping cylinder 10 is fixedly connected to a clamping plate 11. The clamping plate 11 contacts the clamping head 12 protruding from the outer end face of the clamping end cover 9 inward. The protruding ridge of the inner end face of the clamping end cover 9 contacts the outer end face of one of the end face limiting plates 5 of the second set of support tensioning units.

[0014] In each set of support tensioning units, two end face limiting discs 5 face to face and are used in pairs. A V-shaped elastic support disc 6 is installed between each pair of end face limiting discs 5. The axial direction of the V-shaped elastic support disc 6 is positioned by the two end face limiting discs 5. The outer circles of the two sets of support tensioning units jointly support the thin-walled cylinder liner 4 to be processed. Multiple corrugated expansion sleeves 7 separate the two sets of support tensioning units at both ends of the inner hole of the thin-walled cylinder liner 4. The clamping force is transmitted sequentially from the right end to the left end of the positioning mandrel 8 by the contraction of the clamping cylinder 10, and finally the axial force is transmitted to the end face limiting disc 5. At the same time, the two V-shaped elastic support discs 6 and multiple corrugated expansion sleeves 7 are compressed, so that the V-shaped elastic support discs 6 and corrugated expansion sleeves 7 are compressed along the axial direction, thereby achieving radial expansion. After the two V-shaped elastic support discs 6 expand, they serve as the main support for the thin-walled cylinder liner 4, and the multiple corrugated expansion sleeves 7 in the middle provide auxiliary support for the thin-walled cylinder liner 4, so as to achieve the positioning and clamping of the thin-walled cylinder liner 4.

[0015] The flange 29 and left-end positioning boss 24 of the positioning mandrel 8 can meet the machining needs of thin-walled cylinder liners 4 with the same or different inner holes at both ends, and have a wide range of applications. The flange 29 of the positioning mandrel 8 is provided with evenly distributed countersunk holes 28. The positioning boss 24 cooperates with the flange dial 1 and is fixedly connected by multiple screws 2 passing through the countersunk holes 28. The high step vertical surface and the peripheral surface on the right side of the flange 29 are respectively called the axial positioning surface a25 and the radial positioning surface a26, which are used to install the end face pressure plate 3. The end face of the smooth rod of the positioning mandrel 8 has a ring of threaded holes for installing the cylinder body of the clamping cylinder 10. The outer end face of the positioning boss 24 and the outer end face of the clamping plate 11 are respectively provided with center holes 13, which are used for automatic centering of both ends and clamping force application points of the two ends of the thin-walled cylinder liner 4 during grinding.

[0016] Reference Figure 2 The flange dial 1 is mounted on the positioning boss 24 (equivalent to the left end shoulder) of the positioning mandrel 8. A vacancy stop 21 is provided on one end face of the flange dial 1, and the open end of the vacancy stop 21 is in contact with the end face of the grinding machine spindle. A ring of multiple rotating holes 22 is provided on the flange dial 1 along the axial direction for rotating the flange dial 1 during the grinding process, which ultimately drives the rotation of the thin-walled cylinder liner 4.

[0017] Reference Figure 3 The end face pressure plate 3 is mounted on the high step (equivalent to the right end shoulder) of the positioning mandrel 8. The end face pressure plate 3 is provided with an axial positioning surface b19 and a radial positioning surface b20, which correspond to and cooperate with the axial positioning surface a25 and the radial positioning surface a26 provided on the high step.

[0018] Reference Figure 4 The end face limiting plate 5 is a disc shape with a central hole. A limiting groove 18 is opened on one end face. The circumferential surface of the limiting groove 18 is an outwardly expanding inclined surface. The limiting groove 18 is used to control the axial compression degree of the V-shaped elastic support plate 6.

[0019] Reference Figure 5 The structure of the V-shaped elastic support plate 6 is as follows: the main body is in the shape of a ring and is made of elastic material. Multiple elastic grooves 14 are radially arranged on the outer circumference of the main body, and multiple elastic grooves 14 are radially arranged on the inner circumference of the main body, with the inward and outward elastic grooves 14 alternating in an umbrella-like distribution. The inner circumference of the main body is configured as symmetrically outward-curving V-shaped inclined surfaces 15, and each V-shaped inclined surface 15 has an outer inclined protrusion 16 on its inner edge. The outer circumference of the main body is divided by the elastic grooves 14 into umbrella-shaped centering bosses. 17. When the two end faces of the V-shaped elastic support plate 6 are subjected to axial force, they undergo elastic deformation. Due to the compression of the end face limiting plates 5 on both sides, the V-shaped elastic support plate 6 can only undergo elastic deformation in the radial direction. The centering boss 17 will expand radially outward and adhere to the inner wall of the thin-walled cylinder liner 4, providing sufficient and evenly distributed main supporting force for supporting the inner hole of the thin-walled cylinder liner 4. When the axial force on the V-shaped elastic support plate 6 disappears, the V-shaped elastic support plate 6 itself rebounds to the original free state through plastic deformation, thereby unloading the supporting force on the thin-walled cylinder liner 4 and loosening the thin-walled cylinder liner 4.

[0020] Reference Figure 7 The structure of the corrugated expansion sleeve 7 is that the main body is a thick-walled cylindrical shape, made of elastic material, and multiple circumferentially distributed elastic grooves 27 are provided on the outer circle and inner hole of the main body. When subjected to axial force compression, the corrugated expansion sleeve 7 undergoes radial elastic deformation, providing auxiliary support force for tightening the middle section inner hole of the thin-walled cylinder liner 4, and protecting the thin-walled cylinder liner 4; when the axial force disappears, the corrugated expansion sleeve 7 will spring back to the free state under plastic deformation, thereby unloading the tightening force on the thin-walled cylinder liner 4 and loosening the thin-walled cylinder liner 4.

[0021] The working principle of this invention is: See Figure 6 The positioning mandrel 8 on the right side of flange 29 is designed with a three-step shape to meet the machining requirements of the thin-walled cylinder liner 4 with the same or different inner hole shapes at both ends. The higher step is fitted with a matching end face pressure plate 3 via axial positioning surface a25 and radial positioning surface a26. Two sets of support tensioning units are separated at both ends of the inner hole of the thin-walled cylinder liner 4 by a wave-shaped tensioning sleeve 7. The right end face of the smooth rod has a reamed threaded hole structure, through which a clamping cylinder 10 is connected. When the clamping cylinder 10 retracts, the axial... The clamping force is sequentially transmitted to the clamping plate 11, the clamping end cover 9, the corrugated expansion sleeve 7, and the two sets of support and tensioning units, applying axial force to the four end face limiting discs 5, compressing the two V-shaped elastic support discs 6 and the corrugated expansion sleeves 7, so that the two V-shaped elastic support discs 6 and multiple corrugated expansion sleeves 7 are compressed axially at the same time, thereby achieving radial expansion, positioning and clamping the inner hole of the thin-walled cylinder liner 4 throughout its entire length; the end face limiting discs 5 play an axial limiting role, preventing the V-shaped elastic support discs 6 from deforming beyond their elastic deformation limit.

[0022] The flange dial 1 is provided with a recessed stop 21 to ensure that the flange dial 1 makes circumferential contact with the end of the grinding machine spindle. The flange dial 1 is also provided with four evenly distributed rotating holes 22. The rotation torque of the grinding machine spindle is directly transmitted to the rotating holes 22 through the lever, and the rotating holes 22 drive the entire device of the present invention to rotate. The flange dial 1 is provided with four bolt holes 23 on the recessed stop 21. The screws 2 fix the flange dial 1 to the positioning mandrel 8 through the bolt holes 23, transmitting the torque of the grinding machine spindle to the positioning mandrel 8 to realize the grinding of the thin-walled cylinder liner 4.

[0023] The end face pressure plate 3 is provided with an axial positioning surface b19 and a radial positioning surface b20, which serve to provide a precise axial and radial positioning reference for the thin-walled cylinder liner 4 installed on the device of the present invention.

[0024] The end face limiting plate 5 is provided with a limiting groove 18. As the end face limiting plates 5 are used in pairs, the opening surfaces of the two limiting grooves 18 face each other, and a V-shaped elastic support plate 6 is installed in the middle. The end face limiting plate 5 provides a limiting function and appropriate elastic deformation space for the axial elastic deformation of the V-shaped elastic support plate 6.

[0025] The clamping method for thin-walled cylinder liner grinding in automated tubing equipment of the present invention is implemented according to the following steps: Step 1: Assemble the flange dial 1 and the positioning mandrel 8. A flange dial 1 is mounted on the positioning boss 24 at the left end of the positioning mandrel 8, and the flange 29 of the positioning mandrel 8 is securely connected to the flange dial 1 by screws 2. Step 2: Install the end face pressure plate 3, two sets of support tensioning units, and waveform expansion sleeve 7 on the positioning mandrel 8. Set the end face pressure plate 3 onto the radial positioning surface a26 of the high step of the positioning mandrel 8, ensuring that the axial positioning surface a25 is in close contact with the axial positioning surface b19 on the end face pressure plate 3. Then, set the first end face limiting plate 5 with its opening to the right onto the positioning mandrel 8 from the right end. Set the first V-shaped elastic support plate 6 onto the positioning mandrel 8 from the right end. Then, set the second end face limiting plate 5 with its opening to the left onto the positioning mandrel 8 from the right end. Then, according to the actual length of the thin-walled cylinder liner 4, set the appropriate length and number of wave-shaped expansion sleeves 7 from the right end of the positioning mandrel 8 in sequence. Then, set the third end face limiting plate 5 with its opening to the right onto the positioning mandrel 8 from the right end. Set the second V-shaped elastic support plate 6 onto the positioning mandrel 8 from the right end. Then, set the fourth end face limiting plate 5 with its opening to the left onto the positioning mandrel 8 from the right end, keeping the two V-shaped elastic support plates 6 at both ends in a natural state. Step 3: Install the thin-walled cylinder liner 4 and start the clamping cylinder 10 to tighten the inner bore of the thin-walled cylinder liner 4. First, fit the inner hole of the thin-walled cylinder liner 4 onto the outer circumference of the two V-shaped elastic support plates 6 installed in step 2, ensuring that the left end face of the thin-walled cylinder liner 4 is in close contact with the axial positioning surface b19 on the end face pressure plate 3; Then, the clamping cylinder 10 is fixed to the right end face of the positioning mandrel 8 through the reamed hole bolt. The clamping plate 11 is connected to the clamping cylinder 10. The clamping end cover 9 is placed between the clamping plate 11 and the outer end face of the fourth end face limiting plate 5. The clamping cylinder 10 is started. The clamping cylinder 10 retracts, and the axial clamping force of the clamping plate 11 is transmitted to the clamping end cover 9. The clamping end cover 9 then pushes the fourth end face limiting plate 5 inward, compressing the two V-shaped elastic support plates 6 in sequence, causing radial elastic deformation. At the same time, the intermediate wave-shaped expansion sleeve 7 is also compressed and undergoes radial elastic deformation, thus tightening the inner hole of the thin-walled cylinder sleeve 4. The clamping cylinder 10 is kept in the retracted state. The pressure supply accessories of the clamping cylinder 10 are removed to facilitate the rotation operation on the grinding machine. Step 4: Install the assembled device of the present invention and the thin-walled cylinder liner 4 onto the grinding machine. Install the center hole 13 on the left end face of the positioning mandrel 8 onto the corresponding center on the grinding machine spindle end. At the same time, install the center hole 13 on the right end face of the clamping plate 11 onto the corresponding center on the grinding machine tailstock. Then, pass the grinding machine lever through the turning hole 22 on the flange dial 1 and securely connect the grinding machine lever to the grinding machine spindle end. The grinding of the thin-walled cylinder liner 4 can then begin.

[0026] Example 1 Embodiment 1 of the present invention provides a clamping device for grinding thin-walled cylinder liners in automated tubing equipment.

[0027] The system includes a positioning mandrel 8, which, from its large end to its smooth rod end, is sequentially referred to as a positioning boss 24, a flange 29, a high step, a low step, and a smooth rod. A flange dial 1 is fitted onto the outer surface of the positioning boss 24, and the flange dial 1 is fixedly connected to the flange 29. An end face pressure plate 3 is fitted onto the high step of the positioning mandrel 8, and a first set of support and tensioning units is fitted onto the low step of the positioning mandrel 8. A second set of support and tensioning units is fitted onto the smooth rod near its outer end. Multiple wave-shaped tension sleeves 7 are fitted onto the smooth rod between the two sets of support and tensioning units. A clamping cylinder 10 is fixed to the outer end face of the smooth rod, and a clamping plate 11 is fixedly connected to the piston rod of the clamping cylinder 10. The clamping plate 11 contacts the clamping end cover 9 inward, and the inner end face of the clamping end cover 9 contacts the second set of support and tensioning units.

[0028] See Figure 5The V-shaped elastic support plate 6 is designed with 32 radial elastic grooves 14 arranged in an alternating pattern. Sixteen of these grooves 14, cut from the outside inwards, divide the outer circumference of the V-shaped elastic support plate 6 into 16 evenly distributed centering bosses 17. The inner hole of the V-shaped elastic support plate 6 is V-shaped, and the 16 elastic grooves 14, cut from the inside outwards, divide the V-shape into 16 pairs of V-shaped inclined surfaces 15. The outer inclined surface convex edge 16 of each V-shaped inclined surface 15 contacts the end face of the limiting groove 18 on the end face limiting plate 5, receiving the compression of the end face limiting plate 5. The V-shaped inclined surface 15 provides sufficient elastic deformation for the V-shaped elastic support plate 6. When tightening the thin-walled cylinder liner 4, the axial clamping force is sequentially transmitted to the end face limiting plates 5 on both sides by the contraction of the clamping cylinder 10. The four end face limiting plates 5 simultaneously undergo uniform radial elastic deformation by compressing the two V-shaped elastic support plates 6. The centering boss 17 is evenly spread out, thereby tightening the inner holes at both ends of the thin-walled cylinder liner 4, realizing the axial automatic centering and clamping function of the thin-walled cylinder liner 4 at both ends simultaneously; when the thin-walled cylinder liner 4 is released, the pressure cylinder 10 is vented to release the axial pressure force, and when the V-shaped inclined surface 15 on the V-shaped elastic support plate 6 rebounds to its natural state under its own rebound force, the outer inclined convex edge 16 on both sides will apply the rebound force to the limiting groove 18 of the end face limiting plate 5 on each side in sequence, pushing the end face limiting plate 5 on both sides to loosen axially, realizing the elimination of the radial pressure force of the V-shaped elastic support plate 6, and releasing the thin-walled cylinder liner 4; the positioning boss 24 of the positioning spindle 8 is provided with a center hole 13 on its outer end face, and the rightmost end of the pressure plate 11 is also provided with a center hole 13. The grinding machine completes the precise clamping and positioning of the device of the present invention by cooperating with the two center holes 13 at both ends of the center.

[0029] Example 2 Embodiment 1 of the present invention provides a clamping device for grinding thin-walled cylinder liners in automated tubing equipment.

[0030] The system includes a positioning mandrel 8, which, from its large end to its smooth rod end, is sequentially referred to as a positioning boss 24, a flange 29, a high step, a low step, and a smooth rod. A flange dial 1 is fitted onto the outer surface of the positioning boss 24, and the flange dial 1 is fixedly connected to the flange 29. An end face pressure plate 3 is fitted onto the high step of the positioning mandrel 8, and a first set of support and tensioning units is fitted onto the low step of the positioning mandrel 8. A second set of support and tensioning units is fitted onto the smooth rod near its outer end. Multiple wave-shaped tension sleeves 7 are fitted onto the smooth rod between the two sets of support and tensioning units. A clamping cylinder 10 is fixed to the outer end face of the smooth rod, and a clamping plate 11 is fixedly connected to the piston rod of the clamping cylinder 10. The clamping plate 11 contacts the clamping end cover 9 inward, and the inner end face of the clamping end cover 9 contacts the second set of support and tensioning units.

[0031] An end face pressure plate 3 is mounted on the high step of the positioning mandrel 8, and a first set of support and tensioning units is mounted on the low step of the positioning mandrel 8. A second set of support and tensioning units is mounted on the outer end of the smooth rod of the positioning mandrel 8. Each set of support and tensioning units consists of two end face limiting plates 5 and a V-shaped elastic support plate 6, and the V-shaped elastic support plate 6 is sandwiched between the two end face limiting plates 5.

[0032] Example 3 Embodiment 1 of the present invention provides a clamping device for grinding thin-walled cylinder liners in automated tubing equipment.

[0033] The system includes a positioning mandrel 8, which, from its large end to its smooth rod end, is sequentially referred to as a positioning boss 24, a flange 29, a high step, a low step, and a smooth rod. A flange dial 1 is fitted onto the outer surface of the positioning boss 24, and the flange dial 1 is fixedly connected to the flange 29. An end face pressure plate 3 is fitted onto the high step of the positioning mandrel 8, and a first set of support and tensioning units is fitted onto the low step of the positioning mandrel 8. A second set of support and tensioning units is fitted onto the smooth rod near its outer end. Multiple wave-shaped tension sleeves 7 are fitted onto the smooth rod between the two sets of support and tensioning units. A clamping cylinder 10 is fixed to the outer end face of the smooth rod, and a clamping plate 11 is fixedly connected to the piston rod of the clamping cylinder 10. The clamping plate 11 contacts the clamping end cover 9 inward, and the inner end face of the clamping end cover 9 contacts the second set of support and tensioning units.

[0034] Reference Figure 2 The flange dial 1 is mounted on the positioning boss 24 (equivalent to the left end shoulder) of the positioning mandrel 8. A vacancy stop 21 is provided on one end face of the flange dial 1, and the open end of the vacancy stop 21 is in contact with the end face of the grinding machine spindle. A ring of multiple rotating holes 22 is provided on the flange dial 1 along the axial direction for rotating the flange dial 1 during the grinding process, which ultimately drives the rotation of the thin-walled cylinder liner 4.

[0035] Example 4 Embodiment 1 of the present invention provides a clamping device for grinding thin-walled cylinder liners in automated tubing equipment.

[0036] The system includes a positioning mandrel 8, which, from its large end to its smooth rod end, is sequentially referred to as a positioning boss 24, a flange 29, a high step, a low step, and a smooth rod. A flange dial 1 is fitted onto the outer surface of the positioning boss 24, and the flange dial 1 is fixedly connected to the flange 29. An end face pressure plate 3 is fitted onto the high step of the positioning mandrel 8, and a first set of support and tensioning units is fitted onto the low step of the positioning mandrel 8. A second set of support and tensioning units is fitted onto the smooth rod near its outer end. Multiple wave-shaped tension sleeves 7 are fitted onto the smooth rod between the two sets of support and tensioning units. A clamping cylinder 10 is fixed to the outer end face of the smooth rod, and a clamping plate 11 is fixedly connected to the piston rod of the clamping cylinder 10. The clamping plate 11 contacts the clamping end cover 9 inward, and the inner end face of the clamping end cover 9 contacts the second set of support and tensioning units.

[0037] Reference Figure 3 The end face pressure plate 3 is mounted on the high step (equivalent to the right end shoulder) of the positioning mandrel 8. The end face pressure plate 3 is provided with an axial positioning surface b19 and a radial positioning surface b20, which correspond to and cooperate with the axial positioning surface a25 and the radial positioning surface a26 provided on the high step.

[0038] Reference Figure 4 The end face limiting plate 5 is a disc shape with a central hole. A limiting groove 18 is opened on one end face. The circumferential surface of the limiting groove 18 is an outwardly expanding inclined surface. The limiting groove 18 is used to control the axial compression degree of the V-shaped elastic support plate 6.

[0039] Example 5 Embodiment 1 of the present invention provides a clamping device for grinding thin-walled cylinder liners in automated tubing equipment.

[0040] The system includes a positioning mandrel 8, which, from its large end to its smooth rod end, is sequentially referred to as a positioning boss 24, a flange 29, a high step, a low step, and a smooth rod. A flange dial 1 is fitted onto the outer surface of the positioning boss 24, and the flange dial 1 is fixedly connected to the flange 29. An end face pressure plate 3 is fitted onto the high step of the positioning mandrel 8, and a first set of support and tensioning units is fitted onto the low step of the positioning mandrel 8. A second set of support and tensioning units is fitted onto the smooth rod near its outer end. Multiple wave-shaped tension sleeves 7 are fitted onto the smooth rod between the two sets of support and tensioning units. A clamping cylinder 10 is fixed to the outer end face of the smooth rod, and a clamping plate 11 is fixedly connected to the piston rod of the clamping cylinder 10. The clamping plate 11 contacts the clamping end cover 9 inward, and the inner end face of the clamping end cover 9 contacts the second set of support and tensioning units.

[0041] Reference Figure 7 The structure of the corrugated expansion sleeve 7 is that the main body is a thick-walled cylindrical shape, made of elastic material, and multiple circumferentially distributed elastic grooves 27 are provided on the outer circle and inner hole of the main body. When subjected to axial force compression, the corrugated expansion sleeve 7 undergoes radial elastic deformation, providing auxiliary support force for tightening the middle section inner hole of the thin-walled cylinder liner 4, and protecting the thin-walled cylinder liner 4; when the axial force disappears, the corrugated expansion sleeve 7 will spring back to the free state under plastic deformation, thereby unloading the tightening force on the thin-walled cylinder liner 4 and loosening the thin-walled cylinder liner 4.

[0042] Example 6 The clamping method for thin-walled cylinder liner grinding in automated tubing equipment of the present invention is implemented according to the following steps: Step 1: Assemble the flange dial 1 and the positioning mandrel 8. A flange dial 1 is mounted on the positioning boss 24 at the left end of the positioning mandrel 8, and the flange 29 of the positioning mandrel 8 is securely connected to the flange dial 1 by four screws 2. Step 2: Install the end face pressure plate 3, two sets of support tensioning units, and three waveform expansion sleeves 7 on the positioning mandrel 8. Set the end face pressure plate 3 onto the radial positioning surface a26 of the high step of the positioning mandrel 8, ensuring that the axial positioning surface a25 is in close contact with the axial positioning surface b19 on the end face pressure plate 3. Then, set the first end face limiting plate 5 with its opening to the right onto the positioning mandrel 8 from the right end. Set the first V-shaped elastic support plate 6 onto the positioning mandrel 8 from the right end. Then, set the second end face limiting plate 5 with its opening to the left onto the positioning mandrel 8 from the right end. Then, according to the actual length of the thin-walled cylinder liner 4, set three wave-shaped expansion sleeves 7 onto the positioning mandrel 8 from the right end in sequence. Then, set the third end face limiting plate 5 with its opening to the right onto the positioning mandrel 8 from the right end. Set the second V-shaped elastic support plate 6 onto the positioning mandrel 8 from the right end. Then, set the fourth end face limiting plate 5 with its opening to the left onto the positioning mandrel 8 from the right end, keeping the two V-shaped elastic support plates 6 at both ends in a natural state. Step 3: Install the thin-walled cylinder liner 4 and start the clamping cylinder 10 to tighten the inner bore of the thin-walled cylinder liner 4. First, fit the inner hole of the thin-walled cylinder liner 4 onto the outer circumference of the two V-shaped elastic support plates 6 installed in step 2; then, fix the clamping cylinder 10 to the right end face of the positioning spindle 8 through the reamed hole bolt, connect the clamping plate 11 to the clamping cylinder 10, and place the clamping end cover 9 between the clamping plate 11 and the outer end face of the fourth end face limiting plate 5; start the clamping cylinder 10, and the axial clamping force of the clamping plate 11 is transmitted to the clamping end cover 9 by the contraction of the clamping cylinder 10. The clamping end cover 9 then pushes the fourth end face limiting plate 5 inward, compressing the two V-shaped elastic support plates 6 in sequence to cause radial elastic deformation. At the same time, the intermediate wave-shaped expansion sleeve 7 is also compressed and undergoes radial elastic deformation, thus tightening the inner hole of the thin-walled cylinder liner 4; keep the clamping cylinder 10 in the contracted state and remove the pressure supply accessories of the clamping cylinder 10; Step 4: Install the assembled device of the present invention and the thin-walled cylinder liner 4 onto the grinding machine. Install the center hole 13 on the left end face of the positioning mandrel 8 onto the corresponding center on the grinding machine spindle end. At the same time, install the center hole 13 on the right end face of the clamping plate 11 onto the corresponding center on the grinding machine tailstock. Then, pass the grinding machine lever through the turning hole 22 on the flange dial 1 and securely connect the grinding machine lever to the grinding machine spindle end. The grinding of the thin-walled cylinder liner 4 can then begin.

Claims

1. A clamping device for thin-walled cylinder liner grinding in automated tubing column equipment, characterized in that: The positioning mandrel (8) is called the positioning boss (24), flange (29), high step, low step and smooth rod from the large end to the smooth rod end. The outer circular surface of the positioning boss (24) is fitted with a flange dial (1), and the flange dial (1) is fixedly connected to the flange (29). An end face pressure plate (3) is mounted on the high step of the positioning mandrel (8), and a first set of support tensioning units is mounted on the low step of the positioning mandrel (8). A second set of support tensioning units is mounted on the outer end of the smooth rod of the positioning mandrel (8). Multiple wave-shaped expansion sleeves (7) are mounted on the smooth rod between the two sets of support tensioning units. A pressing cylinder (10) is fixed on the outer end face of the smooth rod. A pressing plate (11) is fixedly connected to the piston rod of the pressing cylinder (10). The pressing plate (11) contacts the pressing end cover (9) inward. The inner end face of the pressing end cover (9) contacts the second set of support tensioning units.

2. The clamping device for thin-walled cylinder liner grinding in automated tubing equipment according to claim 1, characterized in that: The structure of the support tensioning unit consists of two end face limiting discs (5) and a V-shaped elastic support disc (6), with the V-shaped elastic support disc (6) sandwiched between the two end face limiting discs (5) and the two end face limiting discs (5) facing each other.

3. The clamping device for thin-walled cylinder liner grinding in automated tubing equipment according to claim 2, characterized in that: The main body of the end face limiting plate (5) is a disc shape with a central hole, and a limiting groove (18) is opened on one end face. The circumferential surface of the limiting groove (18) is an outwardly expanding inclined surface.

4. The clamping device for thin-walled cylinder liner grinding in automated tubing equipment according to claim 2, characterized in that: The structure of the V-shaped elastic support plate (6) is as follows: the main body is in the shape of a ring and is made of elastic material. Multiple elastic grooves (14) are opened on the outer circle of the main body in a radial direction towards the axis. Multiple elastic grooves (14) are opened on the inner circle of the main body in a radial direction towards the outer circle. The inward elastic grooves (14) and the outward elastic grooves (14) are alternately distributed in an umbrella shape. The inner circle of the main body is set as a symmetrical outward-turned V-shaped inclined surface (15). Each V-shaped inclined surface (15) has an outer inclined surface protrusion (16) on the inner edge of the outer surface. The outer circle surface of the main body is divided into umbrella-shaped centering bosses (17) by the elastic grooves (14).

5. The clamping device for thin-walled cylinder liner grinding in automated tubing equipment according to claim 1, characterized in that: The flange dial (1) is provided with a vacancy stop (21) on one end face, and the open end of the vacancy stop (21) is in contact with the end face of the grinding machine spindle; a ring of multiple rotating holes (22) is provided on the flange dial (1) along the axial direction.

6. The clamping device for thin-walled cylinder liner grinding in automated tubing equipment according to claim 1, characterized in that: The end face pressure plate (3) is provided with an axial positioning surface b (19) and a radial positioning surface b (20), which correspond to and cooperate with the axial positioning surface a (25) and the radial positioning surface a (26) provided on the high step.

7. The clamping device for thin-walled cylinder liner grinding in automated tubing equipment according to claim 1, characterized in that: The structure of the wave expansion sleeve (7) is that the main body is in the shape of a thick-walled cylinder and is made of elastic material. Multiple elastic grooves (27) are provided on the outer circle and inner hole of the main body.

8. A clamping method for grinding thin-walled cylinder liners in automated tubing string equipment, utilizing the clamping device for grinding thin-walled cylinder liners in automated tubing string equipment as described in claim 1, characterized in that... Follow these steps: Step 1: Install the flange dial (1) on the positioning boss (24) of the positioning mandrel (8); Step 2: Install the end face pressure plate (3), two sets of support tensioning units, and waveform expansion sleeve (7) on the positioning mandrel (8); Step 3: Install the thin-walled cylinder liner (4) and start the clamping cylinder (10) to tighten the inner hole of the thin-walled cylinder liner (4); Step 4: Install the assembled device of the present invention and the thin-walled cylinder liner (4) onto the grinding machine. Connect the center hole (13) of the positioning mandrel (8) to the center of the grinding machine spindle, connect the center hole (13) of the clamping plate (11) to the center of the grinding machine tailstock, pass the grinding machine lever through the turning hole (22) on the flange dial (1), and securely connect the lever to the end of the grinding machine spindle.

9. The clamping method for thin-walled cylinder liner grinding in automated tubing equipment according to claim 8, characterized in that, Step 2, the specific process is as follows: Set the end face pressure plate (3) onto the high step of the positioning mandrel (8) to ensure that the axial positioning surface a (25) is in close contact with the axial positioning surface b (19) on the end face pressure plate (3). Then, set the first end face limiting plate (5) with its opening facing inward onto the positioning mandrel (8), set the first V-shaped elastic support plate (6) onto the positioning mandrel (8), and then set the second end face limiting plate (5) with its opening facing inward onto the positioning mandrel (8) to form the first set of support tensioning units. Then, based on the actual length of the thin-walled cylinder liner (4), multiple wave-shaped expansion sleeves (7) are sequentially fitted onto the positioning mandrel (8). Next, the third end face limiting plate (5) is fitted outwards onto the positioning mandrel (8), the second V-shaped elastic support plate (6) is fitted onto the positioning mandrel (8), and the fourth end face limiting plate (5) is fitted inwards onto the positioning mandrel (8) to form the second set of support tensioning units; keep the V-shaped elastic support plates (6) in both sets of support tensioning units in their natural state.

10. The clamping method for thin-walled cylinder liner grinding in automated tubing equipment according to claim 8, characterized in that, Step 3, the specific process is as follows: First, install the inner hole of the thin-walled cylinder liner (4) on the outer circumference of the two V-shaped elastic support plates (6) to ensure that the thin-walled cylinder liner (4) is in close contact with the end face pressure plate (3); Then, the clamping cylinder (10) is fixed to the end face of the locating spindle (8) through the hinge hole bolt, the clamping plate (11) is connected to the clamping cylinder (10), and the clamping end cover (9) is placed between the clamping plate (11) and the outer end face of the fourth end face limiting plate (5). Start the clamping cylinder (10), and the clamping cylinder (10) contracts to transfer the axial clamping force of the clamping plate (11) to the clamping end cover (9). The clamping end cover (9) then presses the fourth end face limiting plate (5) inward, and the two V-shaped elastic support plates (6) are compressed in sequence to undergo radial elastic deformation. At the same time, the multiple wave-shaped expansion sleeves (7) in the middle are also compressed to undergo radial elastic deformation, thus tightening the inner hole of the thin-walled cylinder sleeve (4). Keep the clamping cylinder (10) in a contracted state and remove the pressure supply parts of the clamping cylinder (10).

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