Center positioning device for supporting boring bar

Abstract

The utility model discloses a center positioning device for supporting a boring bar, which comprises a shell, wherein a circular mounting hole is formed in the middle of the shell; a first crossed roller bearing and a second crossed roller bearing are arranged in the circular mounting hole; bearing inner sleeves are arranged on inner rings of the first crossed roller bearing and the second crossed roller bearing, and threaded spring chucks are arranged on inner rings of the bearing inner sleeves; and four groups of positioning and supporting assemblies are arranged on the inner side of the shell at equal intervals in the circumferential direction. According to the utility model, the threaded spring chuck is coaxially sleeved on the boring rod to realize the rotary connection between the shell and the boring rod, and the four groups of positioning and supporting components on the shell are adjusted to drive the ejector rod to extend outwards and be attached to the inner wall of the large pipe fitting, so that the axes of the boring rod and the large pipe fitting are overlapped; the boring bar self-weight deformation supporting problem in the shafting boring process is effectively solved, the using effect in the shafting boring process is good, the machining quality is guaranteed, practicability is high, and the shafting boring bar self-weight deformation supporting device has wide market prospects.

Description

Technical Field

[0001] The utility model relates to the technical field of boring holes, in particular to a center positioning device for supporting a boring bar. Background Art

[0002] Boring machines are common equipment for mechanical processing and are increasingly being used. Boring machines mainly use boring cutters to bore prefabricated holes in workpieces. Boring bars are an important structural component in boring machines. When processing workpieces, due to the certain length of the boring bar, the end of the boring bar is subject to its own gravity during the high rotation process, which will cause shaking during long-term work. For smaller workpieces, the boring bar can be fixed by using a support frame; however, when boring the stern tube of the ship's shaft system (main engine, intermediate shaft and stern shaft system), due to the long length of the shaft hole to be processed, it is impossible to add ordinary auxiliary supports in the middle to fix the boring bar, which easily leads to taper and ovality in the boring of the stern tube, affecting the processing quality. Therefore, it is urgent to design a support device that provides support and center calibration for the boring bar when processing large pipes. Summary of the invention

[0003] The purpose of the utility model is to provide a center positioning device for supporting a boring bar, so as to solve the problems raised in the above background technology.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A center positioning device for supporting a boring bar, comprising a shell, wherein a circular mounting hole is opened in the middle of the shell; a first cross roller flange is provided at the upper end of the circular mounting hole, wherein a second cross roller flange is provided at the lower end of the circular mounting hole; a first cross roller bearing is provided on the inner wall of the first cross roller flange, wherein a second cross roller bearing is provided on the inner wall of the second cross roller flange; inner rings of the first cross roller bearing and the second cross roller bearing are provided with bearing inner sleeves, wherein the inner ring of the bearing inner sleeve is provided with a threaded spring chuck, and the threaded spring chuck is coaxially sleeved on the outer wall of the boring bar; four groups of positioning support components are equidistantly arranged along the circumferential direction on the inner side of the shell, wherein each positioning support component can be adjusted to be telescopically extended along the radial direction of the circular mounting hole.

[0006] Preferably, the positioning support assembly comprises a worm wheel and a worm, wherein the worm is arranged on the side of the worm wheel and meshes with it; a worm wheel cover is provided at one end of the worm wheel close to the housing, and a plane needle bearing is provided at the other end of the worm wheel.

[0007] Preferably, an internally threaded cylindrical pin is provided at the upper and lower ends of the outer wall of the worm gear cover, respectively, wherein a pin hole corresponding to the internally threaded cylindrical pin is opened on the shell, and a fixing screw is provided in the pin hole.

[0008] Preferably, flange-type graphite copper sleeves are sleeved on both ends of the worm, and the worm is rotatably connected to the flange-type graphite copper sleeve, wherein the outer wall of the flange-type graphite copper sleeve is fixedly connected to the shell.

[0009] Preferably, an internal threaded through hole is provided in the middle of the worm wheel, wherein a push rod is provided in the internal threaded through hole; an external thread is provided on the outer wall of the push rod, wherein the push rod is threadedly connected to the internal threaded through hole.

[0010] Preferably, one end of the push rod passes through the worm gear cover and extends out of the housing, and the other end of the push rod extends between the first cross roller bearing and the second cross roller bearing.

[0011] Preferably, a limiting groove is provided on the outer wall of the push rod along its axial direction, wherein the inner ring of the worm gear cover is provided with a limiting block matched with the limiting groove.

[0012] Preferably, the cross-section of the bearing inner sleeve is an "L"-shaped structure, wherein a locking nut is provided at the upper end of the bearing inner sleeve, and a tapered sleeve nut is provided at the lower end of the bearing inner sleeve.

[0013] Preferably, an outer wall of the upper end of the threaded spring chuck is provided with an external thread, wherein the locking nut is threadedly connected to the outer wall of the threaded spring chuck.

[0014] Preferably, the upper end of the locking nut is provided with a plurality of threaded holes equidistantly along its circumference, wherein each threaded hole is provided with a screw, which passes through the threaded hole and is fixedly connected to the upper end of the bearing inner sleeve.

[0015] Preferably, the outer wall of the lower end of the bearing inner sleeve is provided with an external thread, wherein the cone sleeve nut is arranged at the lower end of the bearing inner sleeve and is threadedly connected with the outer wall of the bearing inner sleeve.

[0016] Preferably, the outer side of the upper end of the bearing inner sleeve abuts against the side wall of the first cross-roller flange, wherein the outer side of the tapered sleeve nut abuts against the side wall of the second cross-roller flange; a first rubber sealing ring is provided between the first cross-roller flange and the bearing inner sleeve, wherein a second rubber sealing ring is provided between the second cross-roller flange and the tapered sleeve nut.

[0017] Compared with the prior art, the utility model has the following beneficial effects: the utility model realizes the rotational connection between the shell and the boring bar by coaxially sleeveing ​​the threaded spring chuck on the boring bar, and drives the push rod to extend outward and fit against the inner wall of the large pipe by adjusting the four groups of positioning support components on the shell, so that the axis of the boring bar and the large pipe are coincident, which effectively solves the problem of deformation support of the boring bar due to its own weight during the boring of the shaft system. It has a good effect when used in the boring of the shaft system, improves the rigidity of the boring row, improves the shape and position accuracy of the boring processing, ensures the processing quality, greatly improves the economic benefits of the enterprise, has strong practicality, and has broad market prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the housing of the utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure installation of the housing of the utility model;

[0021] Figure 4 yes Figure 1 The AA structure cross-sectional view shown;

[0022] Figure 5a , 5b It is a structural schematic diagram of the positioning support assembly of the utility model;

[0023] Figure 6 It is a schematic diagram of the connection structure between the inner sleeve of the bearing and the upper end of the threaded spring chuck of the utility model;

[0024] Figure 7 The utility model is a schematic diagram of the connection structure between the inner sleeve of the bearing and the lower end of the threaded spring chuck.

[0025] Wherein: 1. Shell; 2. Circular mounting hole; 3. First cross roller flange; 4. Second cross roller flange; 5. First cross roller bearing; 6. Second cross roller bearing; 7. Annular avoidance groove; 8. Bearing inner sleeve; 9. Positioning support assembly; 901. Worm gear; 902. Worm; 903. Worm gear cover; 904. Plane needle roller bearing; 905. Flange type graphite copper sleeve; 10. Threaded spring chuck; 11. Internally threaded cylindrical pin; 12. Pin hole; 13. Fixing screw; 14. Internally threaded through hole; 15. Push rod; 16. Bearing inner ring spacer; 17. Limiting groove; 18. Limiting block; 19. Locking nut; 20. Taper sleeve nut; 21. First rubber sealing ring; 22. Screw; 23. Second rubber sealing ring. DETAILED DESCRIPTION

[0026] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0027] Please refer to Figures 1 to 7 To achieve the above purpose, the utility model provides the following technical solutions:

[0028] A center positioning device for supporting a boring bar, comprising a shell 1, wherein a circular mounting hole 2 is opened in the middle of the shell 1; a first cross roller flange 3 is provided at the upper end of the circular mounting hole 2, wherein a second cross roller flange 4 is provided at the lower end of the circular mounting hole 2; a first cross roller bearing 5 is provided on the inner wall of the first cross roller flange 3, wherein a second cross roller bearing 6 is provided on the inner wall of the second cross roller flange 4; the first cross roller bearing 5 and the second cross roller bearing 6 are symmetrically arranged, wherein an annular avoidance groove 7 is provided between the first cross roller bearing 5 and the second cross roller bearing 6; the inner rings of the first cross roller bearing 5 and the second cross roller bearing 6 are provided with bearing inner sleeves 8, wherein the inner ring of the bearing inner sleeve 8 is provided with a threaded spring chuck 10, and the threaded spring chuck 10 is coaxially sleeved on the outer wall of the boring bar; four groups of positioning support components 9 are equidistantly arranged along the circumferential direction on the inner side of the shell 1, wherein each positioning support component 9 can be adjusted to be telescopic along the radial direction of the circular mounting hole 2. By coaxially sleeved the threaded spring collet 10 on the boring bar, the boring bar is fixedly connected to the threaded spring collet 10, so that the boring bar drives the threaded spring collet 10 to rotate on the inner rings of the first cross roller bearing 5 and the second cross roller bearing 6, thereby realizing the rotational connection between the housing 1 and the boring bar. By adjusting the four groups of positioning support assemblies 9 installed on the outside of the housing 1, the positioning support assemblies 9 drive the push rod 15 to extend outward and fit against the inner wall of the large pipe fitting. The boring bar is supported by the positioning support assemblies 9, so that the axes of the boring bar and the large pipe fitting coincide, effectively solving the problem of deformation support of the boring bar due to its own weight during the boring of the shaft system, greatly improving the shape and position accuracy of the boring processing, and improving the processing quality and work efficiency.

[0029] Please refer to Figure 3 , Figure 5a , Figure 5bAs an embodiment of the utility model, the positioning support assembly 9 includes a worm wheel 901 and a worm 902, wherein the worm 902 is arranged on the side of the worm wheel 901 and meshed with it; a worm wheel cover 903 is provided at one end of the worm wheel 901 close to the housing 1, wherein the other end of the worm wheel 901 is sleeved with a plane needle bearing 904, and the plane needle bearing 904 is used to reduce the edge stress of the worm wheel 901 and improve its service life; the upper and lower ends of the worm wheel cover 903 are symmetrically provided with internal threaded cylindrical pins 11, wherein the housing 1 is provided with a pin hole 12 corresponding to the internal threaded cylindrical pin 11, and a fixing screw 13 is provided in the pin hole 12; flange-type graphite copper sleeves 905 are respectively provided at both ends of the worm 902, wherein the worm 902 is rotatably connected to the flange-type graphite copper sleeves 905, and the flange-type The outer wall of the graphite copper sleeve 905 is fixedly connected to the shell 1; an internal threaded through hole 14 is provided in the middle of the worm gear 901, wherein a push rod 15 is provided in the internal threaded through hole 14; an external thread is provided on the outer wall of the push rod 15, wherein the push rod 15 is threadedly connected to the internal threaded through hole 14; one end of the push rod 15 passes through the worm gear pressure cover 903 and extends out of the shell 1, and the other end of the push rod 15 extends to between the first cross roller bearing 5 and the second cross roller bearing 6; the diameter of the push rod 15 is smaller than the width of the annular avoidance groove 7, wherein a bearing inner ring spacer 16 is provided at the bottom of the annular avoidance groove 7, and the bearing inner ring spacer 16 is fixedly connected to the outer wall of the bearing inner sleeve 8; a limiting groove 17 is provided on the outer wall of the push rod 15 along its axial direction, wherein a limiting block 18 matching the limiting groove 17 is provided on the inner ring of the worm gear pressure cover 903.

[0030] In the above scheme, in order to achieve the height adjustment of the positioning support assembly 9 in the radial direction of the boring bar, the worm wheel 901 is connected to the housing 1 by using a worm wheel cover 903, and the flange-type graphite copper sleeves 905 are respectively installed at both ends of the worm 902, and the flange-type graphite copper sleeves 905 are fixed on the housing 1, so that the worm wheel 901 and the worm 902 are meshed and driven at the side of the housing 1; when in use, the threaded spring chuck 10 is coaxially sleeved on the boring bar, so that the boring bar and the threaded spring chuck 10 are fixedly connected to achieve the rotational connection between the housing 1 and the boring bar, and the worm 902 is rotated to drive the worm wheel 901 to rotate, because the push rod 15 is screwed with the internal thread through hole 14 on the worm wheel 901, and In addition, a limiting groove 17 is provided on the outer wall of the push rod 15. When the worm gear 901 rotates, the limiting groove 17 on the outer wall of the push rod 15 cooperates with the limiting block 18 provided on the worm gear cover 903, wherein the limiting groove 17 cooperates with the limiting block 18 to guide and limit the movement of the push rod 15, so that the push rod 15 can only be extended and retracted along the axial direction of the internal threaded through hole 14, so that the front end of the push rod 15 extends outward and fits against the inner wall of the large pipe fitting. The four groups of positioning support assemblies 9 are used to simultaneously control the push rod 15 to perform extension and retraction adjustment, so that it supports the boring bar, so that the axis of the boring bar and the large pipe fitting coincide, which effectively solves the problem of deformation support of the boring bar due to its own weight during the boring of the shaft system, and is easy to use.

[0031] Please refer to Figure 4 , Figure 6 and Figure 7 As an embodiment of the utility model, the cross section of the bearing inner sleeve 8 is an "L"-shaped structure, wherein a locking nut 19 is provided at the upper end of the bearing inner sleeve 8, and a tapered sleeve nut 20 is provided at the lower end of the bearing inner sleeve 8; the outer side of the upper end of the bearing inner sleeve 8 abuts against the side wall of the first cross roller flange 3, wherein a first rubber sealing ring 21 is provided between the first cross roller flange 3 and the bearing inner sleeve 8; an external thread is provided on the outer wall of the upper end of the threaded spring chuck 10, wherein the locking nut 19 is threadedly connected to the outer wall of the threaded spring chuck 10; ... The upper end of the nut 19 is provided with a plurality of threaded holes equidistantly along its circumference, wherein each threaded hole is provided with a screw 22, which passes through the threaded hole and is fixedly connected to the upper end of the bearing inner sleeve 8; the outer wall of the lower end of the bearing inner sleeve 8 is provided with an external thread, wherein the tapered sleeve nut 20 is arranged at the lower end of the bearing inner sleeve 8 and is threadedly connected to the outer wall of the bearing inner sleeve 8; the outer side of the tapered sleeve nut 20 abuts against the side wall of the second cross roller flange 4, wherein a second rubber sealing ring 23 is provided between the second cross roller flange 4 and the tapered sleeve nut 20.

[0032] In the above scheme, the bearing inner sleeve 8 is installed on the inner side of the first cross roller flange 3 and the second cross roller flange 4, and is screwed together with the external thread of the outer wall of the lower end of the bearing inner sleeve 8 by the tapered sleeve nut 20, so as to fix the bearing inner sleeve 8; the threaded spring collet 10 is installed on the inner wall of the bearing inner sleeve 8, and is screwed together with the external thread on the outer wall of the upper end of the threaded spring collet 10 by the locking nut 19, so as to fix the threaded spring collet 10 on the inner wall of the bearing inner sleeve 8, so as to facilitate the coaxial sleeve of the threaded spring collet 10 on the boring bar. After the locking nut 19 is screwed together and fixed at the lower end of the threaded spring collet 10, it is then screwed together with the threaded hole on the locking nut 19 by the screw 22, so as to fix the locking nut 19 with the upper end of the bearing inner sleeve 8, and the locking nut 19 is arranged at the upper end of the bearing inner sleeve 8 and the tapered sleeve is arranged at the lower end of the bearing inner sleeve 8. The nut 20 is used to improve the firmness of the installation of the bearing inner sleeve 8. The outer side of the upper end of the bearing inner sleeve 8 is abutted against the side wall of the first cross roller flange 3, and the outer side of the tapered sleeve nut 20 is abutted against the side wall of the second cross roller flange 4, so as to improve the stability of the first cross roller bearing 5 and the second cross roller bearing 6 in driving the bearing inner sleeve 8 to rotate, so that the threaded spring collet 10 rotates under the cooperation of the first cross roller bearing 5 and the second cross roller bearing 6. The threaded spring collet 10 is coaxially sleeved on the boring bar to achieve a rotational connection between the housing 1 and the boring bar. The boring bar is supported by the positioning support assembly 9, so that the axis of the boring bar and the large pipe coincide, which effectively solves the problem of deformation support of the boring bar due to its own weight during the boring of the shaft system, greatly improves the shape and position accuracy of the boring processing, and improves the processing quality and work efficiency.

[0033] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principle and essence of the present invention, but these changes and modifications fall within the protection scope of the present invention.

Claims

1. A center positioning device for supporting a boring bar, comprising a housing (1), wherein a circular mounting hole (2) is provided in the middle of the housing (1); characterized in that: A first cross roller flange (3) is provided at the upper end of the circular mounting hole (2), wherein a second cross roller flange (4) is provided at the lower end of the circular mounting hole (2); a first cross roller bearing (5) is provided on the inner wall of the first cross roller flange (3), wherein a second cross roller bearing (6) is provided on the inner wall of the second cross roller flange (4); inner rings of the first cross roller bearing (5) and the second cross roller bearing (6) are provided with bearing inner sleeves (8), wherein the inner rings of the bearing inner sleeves (8) are provided with threaded spring chucks (10); four groups of positioning support components (9) are equidistantly provided on the inner side of the housing (1) along the circumferential direction, wherein each positioning support component (9) can be telescopically adjusted along the radial direction of the circular mounting hole (2).

2. A center positioning device for supporting a boring bar according to claim 1, characterized in that: The positioning support assembly (9) comprises a worm wheel (901) and a worm (902), wherein the worm (902) is arranged on the side of the worm wheel (901) and meshes therewith; a worm wheel cover (903) is provided at one end of the worm wheel (901) close to the housing (1), and a plane needle roller bearing (904) is sleeved at the other end of the worm wheel (901).

3. A center positioning device for supporting a boring bar according to claim 2, characterized in that: An inner threaded cylindrical pin (11) is provided on the outer side wall of the worm gear cover (903), wherein a pin hole (12) corresponding to the inner threaded cylindrical pin (11) is opened on the housing (1), and a fixing screw (13) is provided in the pin hole (12).

4. A center positioning device for supporting a boring bar according to claim 2, characterized in that: Flange-type graphite copper sleeves (905) are sleeved on both ends of the worm (902), wherein the worm (902) and the flange-type graphite copper sleeve (905) are rotatably connected.

5. A center positioning device for supporting a boring bar according to claim 2, characterized in that: An internal threaded through hole (14) is provided in the middle of the worm wheel (901), wherein a push rod (15) is provided in the internal threaded through hole (14); an external thread is provided on the outer wall of the push rod (15), wherein the push rod (15) is threadedly connected to the internal threaded through hole.

6. A center positioning device for supporting a boring bar according to claim 5, characterized in that: One end of the push rod (15) passes through the worm gear cover (903) and extends out of the housing (1), and the other end of the push rod (15) extends between the first cross roller bearing (5) and the second cross roller bearing (6).

7. A center positioning device for supporting a boring bar according to claim 6, characterized in that: The outer wall of the push rod (15) is provided with a limiting groove (17) along its axial direction, wherein the inner ring of the worm gear cover (903) is provided with a limiting block (18) adapted to the limiting groove (17).

8. A center positioning device for supporting a boring bar according to claim 1, characterized in that: The cross section of the bearing inner sleeve (8) is in an "L"-shaped structure, wherein a locking nut (19) is provided at the upper end of the bearing inner sleeve (8), and a tapered sleeve nut (20) is provided at the lower end of the bearing inner sleeve (8); an outer wall at the upper end of the threaded spring chuck (10) is provided with an external thread, wherein the locking nut (19) is threadedly connected to the outer wall of the threaded spring chuck (10); an outer wall at the lower end of the bearing inner sleeve (8) is provided with an external thread, wherein the tapered sleeve nut (20) is arranged at the lower end of the bearing inner sleeve (8) and is threadedly connected to the outer wall of the bearing inner sleeve (8).

9. A center positioning device for supporting a boring bar according to claim 8, characterized in that: The upper end of the locking nut (19) is provided with a plurality of threaded holes equidistantly along its circumference, wherein each threaded hole is provided with a screw (22), the screw (22) passing through the threaded hole and being fixedly connected to the upper end of the bearing inner sleeve (8).

10. A center positioning device for supporting a boring bar according to claim 8, characterized in that: The outer side of the upper end of the bearing inner sleeve (8) abuts against the side wall of the first cross roller flange (3), wherein the outer side of the tapered sleeve nut (20) abuts against the side wall of the second cross roller flange (4); a first rubber sealing ring (21) is provided between the first cross roller flange (3) and the bearing inner sleeve (8), wherein a second rubber sealing ring (23) is provided between the second cross roller flange (4) and the tapered sleeve nut (20).

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