A spindle mounting structure for an oil sleeve threading machine tool and the machine tool itself.

Abstract

This application relates to the technical field of oil casing and pipe thread processing equipment, specifically providing a spindle mounting structure for an oil casing and pipe thread processing machine tool, including a spindle, bearings, and adjusting lock nuts. A support step is provided around the outer side of the spindle. The bearings and adjusting lock nuts are both sleeved on the outer side wall of the spindle, and the support step and adjusting lock nut are respectively provided on both axial sides of the bearing. The outer periphery of the adjusting lock nut has an opening and several screw holes, which are evenly distributed and extend axially along the adjusting lock nut. Each screw hole contains a clamping screw, which presses against the bearing to make the bearing fit against the support step. This embodiment uses the clamping screw as a set screw to achieve secondary precise adjustment of the locking angle, improving processing accuracy.

Description

Technical Field

[0001] This application relates to the technical field of oil casing and pipe thread processing equipment, and in particular to a spindle mounting structure and processing machine tool for oil casing and pipe thread processing. Background Technology

[0002] In the petroleum equipment processing industry, CNC pipe threading lathes can automatically complete the cutting of straight pipe threads and tapered pipe threads. They are suitable for the rapid processing of components such as pipe fittings, casings, and mine pipes, significantly improving production efficiency and serving as core equipment in oil casing processing.

[0003] The spindle is a core component of a CNC pipe threading lathe, directly affecting the pipe thread parameters. The spindle lock nut eliminates the axial clearance between the spindle and the bearing through thread preload. If the lock nut is loose, it will cause axial movement of the spindle, resulting in unstable thread parameters. A loose lock nut will also increase the radial runout of the spindle, causing bending of the workpiece generatrix or twisting of the cylindrical surface during turning, which will make the thread parameters unstable and unable to produce qualified products.

[0004] The diameter of the oil sleeve is usually large, so the diameter of the corresponding spindle lock nut is also large. The torque required for locking is too high. Open lock nuts are usually used, but because there is an opening, it is impossible to ensure that the axial surfaces on both sides of the opening are on the same plane. As a result, the axial surfaces of the spindle and the bearing cannot be completely fitted, and there is still a certain axial gap. The machining accuracy cannot be guaranteed. Utility Model Content

[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide a spindle mounting structure and machining tool for oil sleeve thread processing, which aims to solve the problem that the axial clearance between the bearing and the spindle cannot be fully eliminated due to the use of open lock nuts in the existing technology.

[0006] The technical solution adopted by this application to solve the technical problem is as follows: a spindle mounting structure for an oil sleeve pipe thread processing machine tool, including a spindle, a bearing and an adjusting lock nut; a support step is provided around the outer side of the spindle, the bearing and the adjusting lock nut are both sleeved on the outer side wall of the spindle, and the support step and the adjusting lock nut are respectively provided on both axial sides of the bearing;

[0007] The outer periphery of the adjusting lock nut is provided with an opening and several screw holes. The screw holes are evenly distributed and extend along the axial direction of the adjusting lock nut. Each screw hole is provided with a clamping screw, which presses the bearing so that the bearing fits against the support step.

[0008] Optionally, a pressure plate is also provided on the side of the screw hole near the bearing, the projected outline area of ​​the pressure plate is larger than the projected outline area of ​​the screw hole, and the clamping screw is in contact with the pressure plate.

[0009] Optionally, the pressure plate is provided with an outwardly extending guide rod, and the adjusting lock nut is provided with a guide groove corresponding to the position of the guide rod. The guide rod extends into the guide groove, and the guide rod slides in contact with the inner wall of the guide groove.

[0010] Optionally, each of the pressure plates is provided with at least one pair of guide rods, which are disposed opposite to each other on the pressure plates.

[0011] Optionally, the number of screw holes is configured to be four, and the screw holes are distributed in pairs opposite to each other on the adjusting lock nut.

[0012] Optionally, the pressure plate is provided with a protruding limiting part, the end of the clamping screw is provided with a sleeve, the limiting part extends into the inside of the sleeve, and an elastic element is provided between the bottom of the sleeve and the limiting part.

[0013] Optionally, the guide groove is provided with a limiting step, the limiting step is provided with a limiting hole in the middle, and the guide rod is provided with a limiting ring, the diameter of the limiting ring being larger than the diameter of the limiting hole.

[0014] Optionally, the diameter of the adjusting lock nut is 200mm to 400mm.

[0015] Optionally, the adjusting nut may further include a locking screw, which passes through the adjusting nut and is fixed to the side wall of the opening.

[0016] Another technical solution adopted by this application to solve the technical problem is a machine tool, including the spindle mounting structure of the oil sleeve pipe thread processing machine tool as described above.

[0017] Compared with the prior art, the embodiments of this application, by setting multiple axially extending screw holes and clamping screws on the adjusting lock nut, can ensure that when installing the bearing, the length of the clamping screws extending out of the adjusting lock nut is adjusted to ensure that all parts of the bearing are tightly pressed against the spindle. This avoids the impact of axial clearance between the bearing and the spindle caused by the opening of the adjusting lock nut, and significantly improves the stability of the machine tool operation. The evenly distributed clamping screws can ensure that all parts of the bearing remain flat in the circumferential direction, improving the machining accuracy of the oil sleeve. Attached Figure Description

[0018] Figure 1 This is an installation diagram of the spindle mounting structure for an oil sleeve threading machine tool according to Embodiment 1 of this application;

[0019] Figure 2 This is the front view of the adjustable lock nut in Embodiment 1 of this application;

[0020] Figure 3 This is a cross-sectional view of the adjusting lock nut in Embodiment 1 of this application;

[0021] Figure 4 This is a cross-sectional view of the adjusting lock nut in Embodiment 2 of this application;

[0022] Figure 5 This is a cross-sectional view of the adjusting lock nut in Embodiment 3 of this application.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10. Main spindle; 11. Support step; 20. Bearing; 30. Adjusting lock nut; 31. Opening; 32. Screw hole; 33. Clamping screw; 331. Sleeve; 34. Guide hole; 35. Pressure plate; 351. Limiting part; 36. Guide groove; 37. Elastic element; 38. Locking screw. Detailed Implementation

[0025] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0026] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Because the spindle lock nut has an open design and a large diameter, the axial planes on both sides of the opening cannot be kept on the same plane. As a result, when the spindle lock nut presses the bearing onto the spindle, the spindle and the lock nut cannot be completely fitted with the bearing, and there is still a certain axial gap. Since the bearing is pressed onto the spindle by the lock nut, this axial gap is also the axial gap between the spindle and the bearing. When the spindle rotates, relative sliding will occur between the spindle and the bearing, affecting the machining accuracy of the oil sleeve thread.

[0029] Example 1

[0030] like Figure 1 As shown, a spindle 10 mounting structure for an oil sleeve threading machine tool includes a spindle 10, a bearing 20, and an adjusting lock nut 30. A support step 11 is arranged around the outer side of the spindle 10. The bearing 20 and the adjusting lock nut 30 are both sleeved on the outer side wall of the spindle 10. The support step 11 and the adjusting lock nut 30 are respectively provided on both axial sides of the bearing 20. The adjusting lock nut 30 can press and fix the bearing 20 onto the support step 11, thereby eliminating the axial clearance between the spindle 10 and the bearing 20 and preventing the spindle 10 from moving during operation. In the complete machine tool, the spindle 10 mounting structure mounts the spindle 10 in a spindle 10 housing. The spindle 10 housing has a mounting position for supporting the bearing 20, allowing the spindle 10 to rotate within the spindle 10 housing.

[0031] like Figure 2 and Figure 3 As shown, the outer periphery of the adjusting nut 30 is provided with an opening 31 and several screw holes 32. The screw holes 32 are evenly distributed and extend along the axial direction of the adjusting nut 30. Each screw hole 32 is provided with a clamping screw 33, which presses the bearing 20 so that the bearing 20 is in contact with the support step 11. After the adjusting nut 30 is locked, the newly added clamping screw 33 acts as a set screw to achieve a secondary precise adjustment and locking, further locking the bearing 20 completely onto the spindle 10, effectively eliminating axial clearance and improving the accuracy of the spindle 10.

[0032] In some embodiments, the diameter of the adjusting lock nut 30 is 200mm to 400mm. Those skilled in the art will understand that the diameter of the adjusting lock nut 30 is selected based on the machining diameter of the oil casing.

[0033] In some embodiments, the adjusting nut 30 further includes a locking screw 38, which passes through the adjusting nut and is fixed to the side wall of the opening 31. By providing the locking screw 38, the relative positions of the two sides of the opening 31 can be fixed, further improving accuracy.

[0034] This embodiment of the application, by providing multiple axially extending screw holes 32 and clamping screws 33 on the adjusting lock nut 30, enables the bearing 20 to be tightly pressed against the spindle 10 by adjusting the length of the clamping screws 33 extending out of the adjusting lock nut 30 during bearing 20 installation. This avoids the impact of axial clearance between the bearing 20 and the spindle 10 caused by the opening 31 of the adjusting lock nut 30, thus significantly improving the stability of the machine tool operation. The evenly distributed clamping screws 33 ensure that all parts of the bearing 20 remain flat in the circumferential direction, improving the machining accuracy of the oil sleeve.

[0035] Example 2

[0036] like Figure 4 As shown, the difference between this embodiment and Embodiment 1 is that this embodiment can increase the contact area when the clamping screw 33 applies pressure to the bearing 20, further eliminating the gap between the bearing 20 and the spindle 10. In this embodiment, a pressure plate 35 is also provided on the side of the screw hole 32 near the bearing 20. The projected outline area of ​​the pressure plate 35 is larger than the projected outline area of ​​the screw hole 32, and the clamping screw 33 contacts the pressure plate 35. In this embodiment, the pressure plate 35 is configured as a rectangular plate. A slot is made in the adjusting lock nut 30 to accommodate the pressure plate 35. The shape of the slot is the same as the outline of the pressure plate 35. When the clamping screw 33 is not adjusted, the pressure plate 35 is parallel to the surface of the adjusting lock nut 30. When the clamping screw 33 needs to be adjusted, the clamping screw 33 is rotated to apply pressure to the pressure plate 35. The pressure plate 35 moves outward to press the bearing 20, eliminating the axial gap between the spindle 10 and the bearing 20 when the spindle 10 rotates.

[0037] In some embodiments, the pressure plate 35 is provided with an outwardly extending guide rod (not shown in the figure), and the adjusting lock nut 30 is provided with a guide groove 36 corresponding to the position of the guide rod. The guide rod extends into the guide groove 36, and the guide rod slides in contact with the inner wall of the guide groove 36. By providing the guide rod, it can be ensured that when the clamping screw 33 pushes the pressure plate 35, all parts of the pressure plate 35 move axially simultaneously.

[0038] Furthermore, each of the pressure plates 35 is provided with at least one pair of guide rods, which are disposed opposite to each other on the pressure plate 35. By providing a pair of guide rods, the movement of the pressure rod can be restricted to the direction of the opening in the guide groove 36.

[0039] Specifically, the guide groove 36 is provided with a limiting step, and the limiting step has a limiting hole in the middle. The guide rod has a limiting ring, the diameter of which is larger than the diameter of the limiting hole. The limiting step is located on the side near the bearing 20. The guide rod on the pressure plate 35 passes through the limiting hole and is located on the bottom side of the guide groove 36. A limiting ring is provided on the bottom side of the guide rod. The diameter of the limiting ring is the same as that of the guide hole 34. The limiting ring cannot pass through the limiting hole, thus preventing the pressure plate 35 from falling completely off the adjusting lock nut 30.

[0040] In some embodiments, the number of screw holes 32 is configured to be four, and the screw holes 32 are distributed in pairs opposite to each other on the adjusting lock nut 30. The four screw holes 32 correspond to four clamping screws 33, which can tightly press the bearing 20 in all circumferential directions.

[0041] Example 3

[0042] like Figure 5 As shown, the difference between this embodiment and Embodiment 2 is that this embodiment can further increase the pressure applied by the pressure plate 35 and the bearing 20. In this embodiment, the pressure plate 35 is provided with a protruding limiting part 351, and the end of the clamping screw 33 is provided with a sleeve 331. The limiting part 351 extends into the interior of the sleeve 331, and an elastic element 37 is provided between the bottom of the sleeve 331 and the limiting part 351. The elastic element 37 is a spring with a large elastic force and is in a compressed state. When the clamping screw 33 is tightened so that it enters the screw hole 32, the spring is further compressed, thereby applying continuous pressure to the pressure plate 35, thereby eliminating the gap between the spindle 10 and the bearing 20.

[0043] Those skilled in the art will understand that in the above embodiments, the maximum travel of the pressure plate 35 is 0.05 mm, thereby avoiding the impact of the slight axial clearance between the bearing 20 and the spindle 10 on the operation of the machine tool when the spindle 10 rotates.

[0044] Example 4

[0045] This embodiment proposes a machining tool, including the spindle 10 mounting structure of the oil sleeve pipe thread machining machine tool as described above. This machining tool has all the beneficial effects brought about in the above embodiments, which will not be repeated here.

[0046] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A spindle mounting structure for a machine tool for machining oil sleeve threads, characterized in that, It includes a main shaft, a bearing, and an adjusting lock nut; a support step is provided around the outer side of the main shaft, the bearing and the adjusting lock nut are both sleeved on the outer side wall of the main shaft, and the support step and the adjusting lock nut are respectively provided on both axial sides of the bearing; The outer periphery of the adjusting lock nut is provided with an opening and several screw holes. The screw holes are evenly distributed and extend along the axial direction of the adjusting lock nut. Each screw hole is provided with a clamping screw, which presses the bearing so that the bearing fits against the support step.

2. The spindle mounting structure for oil sleeve thread processing machine tool according to claim 1, characterized in that, A pressure plate is also provided on the side of the screw hole near the bearing. The projected outline area of ​​the pressure plate is larger than the projected outline area of ​​the screw hole, and the clamping screw is in contact with the pressure plate.

3. The spindle mounting structure for oil sleeve thread processing machine tool according to claim 2, characterized in that, The pressure plate is provided with an outwardly extending guide rod, and the adjusting lock nut is provided with a guide groove corresponding to the position of the guide rod. The guide rod extends into the guide groove, and the guide rod slides in contact with the inner sidewall of the guide groove.

4. The spindle mounting structure for oil sleeve threading machine tool according to claim 3, characterized in that, Each of the pressure plates is provided with at least one pair of guide rods, which are disposed opposite to each other on the pressure plates.

5. The spindle mounting structure for oil sleeve threading machine tool according to claim 1, characterized in that, The number of screw holes is configured to be four, and the screw holes are distributed in pairs opposite to each other on the adjusting lock nut.

6. The spindle mounting structure for oil sleeve threading machine tool according to claim 2, characterized in that, The pressure plate is provided with a protruding limiting part, the end of the clamping screw is provided with a sleeve, the limiting part extends into the inside of the sleeve, and an elastic element is provided between the bottom of the sleeve and the limiting part.

7. The spindle mounting structure for oil sleeve threading machine tool according to claim 3, characterized in that, The guide groove is provided with a limiting step, the limiting step is provided with a limiting hole in the middle, and the guide rod is provided with a limiting ring, the diameter of the limiting ring being larger than the diameter of the limiting hole.

8. The spindle mounting structure for oil sleeve threading machine tool according to claim 1, characterized in that, The diameter of the adjusting lock nut is 200mm to 400mm.

9. The spindle mounting structure for oil sleeve threading machine tool according to claim 1, characterized in that, The adjusting nut also includes a locking screw, which passes through the adjusting nut and is fixed to the side wall of the opening.

10. A processing machine tool, characterized in that, Including the spindle mounting structure of the oil sleeve pipe threading machine tool as described in any one of claims 1-9.

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