Quick positioning device for center hole of shaft blank

Abstract

The invention discloses a quick positioning device for a center hole of a shaft blank, relates to the technical field of center hole positioning, and aims to solve the problem that the center hole of the forged shaft blank is difficult to quickly and accurately position, the quick positioning device comprises a lathe bed, and a supporting mechanism for supporting the blank is arranged on the lathe bed. A driving device used for driving the blank to rotate is arranged on the supporting mechanism, a positioning mechanism is further connected to the lathe bed in a sliding mode, and a line drawing mechanism and a punching mechanism are arranged on the positioning mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of center hole positioning, and in particular to a device for quickly positioning the center hole of a shaft blank. Background Art

[0002] When machining shaft blanks, it is generally necessary to use a fixture to hold the center axis, and then drive the blank to rotate. The cutting tool contacts the blank during the rotation process, and then the surface of the blank is cut. The positioning of the center hole before the blank is processed determines the processing accuracy and quality of the blank. If the positioning of the center hole of the blank is inaccurate and the deviation increases, the blank after machining is prone to eccentricity, resulting in the scrapping of the blank and increasing the scrap rate.

[0003] For forged shaft blanks, the uniformity of the outer circle is poor. Positioning the center hole is not only time-consuming and laborious, but also inaccurate and easily eccentric, which leads to a high scrap rate of the forged shaft blanks after processing. Positioning also wastes a lot of time, greatly reducing production efficiency. Summary of the invention

[0004] In order to solve the above-mentioned problem, that is, it is difficult to quickly and accurately position the center hole of a forged shaft blank, the present invention proposes a device for quickly positioning the center hole of a shaft blank, which includes a bed, on which is provided a supporting mechanism for supporting the blank, on which is provided a driving device for driving the blank to rotate, and on which is also a positioning mechanism slidably connected. On the positioning mechanism are provided a marking mechanism and a punching mechanism.

[0005] The present invention is further configured as follows: the support mechanism comprises a bottom plate, two driving wheels and two driven wheels are mounted on the bottom plate, and the driving wheels and the driven wheels are respectively arranged on both sides of the blank to support the blank.

[0006] The present invention is further configured as follows: the two driving wheels are mounted on a rotating shaft, and the rotating shaft is connected to the driving device via a sprocket chain.

[0007] The present invention is further configured as follows: the two driven wheels are rotatably connected to an adjustment plate, two limit slots are provided on the adjustment plate, the limit slots are arranged perpendicular to the rotating shaft, two limit columns are connected to the bottom plate corresponding to the limit slots, the limit columns are passed through the limit slots to adjust the distance between the driving wheel and the driven wheel.

[0008] The present invention is further configured as follows: two adjustment blocks are arranged on the adjustment plate, threaded holes are opened on the adjustment blocks, two ear plates are connected to the base plate corresponding to the adjustment blocks, through holes are opened on the ear plates corresponding to the threaded holes, and pull bolts are threadedly connected in the threaded holes, the pull bolts are arranged through the through holes, and the pull bolts are arranged parallel to the limit grooves.

[0009] The present invention is further configured as follows: the marking mechanism includes a slide rail 1, the slide rail 1 is connected to the positioning mechanism, the slide rail 1 is arranged perpendicular to the blank, a marking rod is slidably connected to the slide rail 1, the marking rod is vertically arranged, a marking tool is slidably connected to the marking rod, and one end of the marking tool is arranged as a pointed end for drawing lines on the blank.

[0010] The present invention is further configured as follows: a sleeve is connected to one end of the marker away from the tip, the sleeve is sleeved on the marker rod, a top screw is threadedly connected to the side wall of the sleeve, and the top screw is against the marker rod at one end close to the marker rod.

[0011] The present invention is further configured as follows: the punching mechanism includes a second slide rail, the second slide rail is connected to the positioning mechanism, the second slide rail is arranged perpendicular to the blank, an installation box is slidably connected to the second slide rail, a lead screw is threadedly connected to the top of the installation box, the bottom end of the lead screw extends into the installation box and is rotatably connected to a puncher, and the top end of the lead screw is arranged on the outside of the installation box.

[0012] The present invention is further configured as follows: a second lead screw is threadedly connected to the bottom of the installation box, the second lead screw is arranged parallel to the second slide rail, and both ends of the second lead screw are rotatably connected to the second slide rail through a mounting plate.

[0013] The present invention is further configured as follows: two vertical guide rods are also provided in the installation box, the two guide rods are symmetrically arranged about the lead screw, and the two ends of the guide rods are respectively fixedly connected to the top and bottom ends of the installation box, and the puncher is slidably connected to the guide rods through a guide block.

[0014] The beneficial effects of the present invention are:

[0015] By setting up a driving device, the purpose of driving the blank to rotate can be achieved, and then the blank is driven to rotate at different angles for multiple times, and a straight line is drawn at one end of the blank by a drawing mechanism after each rotation. A polygon is formed by the intersection of multiple straight lines, and the center point of the polygon is the center hole position of the shaft blank. The determined center point is then punched by a punching mechanism, and the center hole position of the blank with poor outer circle uniformity can be quickly determined, further solving the problems of time-consuming, labor-intensive, inaccurate and easy eccentricity in alignment of shaft forgings on a lathe, thereby improving the accuracy of subsequent processing and reducing the scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The structure of the present invention is shown Figure 1 .

[0017] Figure 2 The structure of the present invention is shown Figure 2 .

[0018] Figure 3 The structure of the present invention is shown Figure 3 .

[0019] Figure 4 A local enlarged view of point A is shown.

[0020] 1. Bed; 2. Support mechanism; 21. Bottom plate; 211. Ear plate; 22. Driving wheel; 23. Driving device; 24. Adjusting plate; 241. Driven wheel; 242. Limiting groove; 243. Adjusting block; 3. Positioning mechanism; 4. Marking mechanism; 41. Slide rail one; 42. Marking rod; 43. Marking tool; 431. Sleeve; 4311. Top screw; 5. Punching mechanism; 51. Slide rail two; 52. Mounting box; 53. Lead screw one; 54. Punch; 55. Lead screw two; 56. Guide rod. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0022] The present invention proposes a device for quickly positioning the center hole of a shaft blank, comprising a bed 1, on which a supporting mechanism 2 for supporting the blank is fixedly installed, the supporting mechanism 2 is equipped with a driving device 23 for driving the blank to rotate, the driving device 23 is selected to be a motor, two parallel guide rails are welded on the upper surface of the bed 1, and a positioning mechanism 3 is slidably connected to the bed 1 through the guide rails. The positioning mechanism 3 is an L-shaped plate, which is slidably connected to the two guide rails, and the driving component of the positioning mechanism 3 adopts the driving structure of the existing saddle, so it is not repeated here.

[0023] The positioning mechanism 3 is provided with a marking mechanism 4 for marking a marking line at one end of the blank. The positioning mechanism 3 is also provided with a punching mechanism 5 for punching holes in the blank after determining the center point of the blank.

[0024] The supporting structure includes a base plate 21, which is fixedly connected to the bed 1. Two driving wheels 22 and two driven wheels 241 are installed on the upper surface of the base plate 21. The driving wheel 22 and the driven wheel 241 are respectively arranged on both sides of the blank to contact the side surface of the blank, thereby supporting the blank.

[0025] The two driving wheels 22 are connected to a rotating shaft for rotation together, and both ends of the rotating shaft are connected to the bottom plate 21 for rotation through bearing seats, and the rotating shaft is arranged parallel to the blank. An external mounting frame is also welded on the bottom plate 21, and the driving device 23 is fixedly connected to the external mounting frame by bolts, and the output end of the driving device 23 is connected to the rotating shaft through a sprocket chain, that is, the driving device 23 can drive the two driving wheels 22 to rotate through the sprocket chain, and then the active rotation can drive the blank to rotate accordingly.

[0026] The two driven wheels 241 are rotatably connected to the adjustment plate 24 through the wheel frame. The adjustment plate 24 is arranged above the bottom plate 21. Two limiting grooves 242 are provided on the adjustment plate 24. The two limiting grooves 242 are arranged in parallel and perpendicular to the rotating shaft. Two limiting columns are welded on the bottom plate 21 corresponding to the two limiting grooves 242. The limiting columns are arranged vertically and penetrate the limiting grooves 242, and the top ends of the limiting columns extend out of the limiting grooves 242. Through the cooperation between the two limiting grooves 242 and the two limiting columns, the adjustment plate 24 can slide along the direction of the limiting grooves 242, thereby achieving the purpose of adjusting the distance between the driving wheel 22 and the driven wheel 241, and meeting the purpose of supporting blanks of different diameters.

[0027] Two adjustment blocks 243 are welded on the adjustment plate 24, and threaded holes are provided on the adjustment blocks 243. Two ear plates 211 are welded on the base plate 21 corresponding to the two adjustment blocks 243, and through holes are provided on the ear plates 211 corresponding to the threaded holes. Pull bolts are threadedly connected in the threaded holes, and the pull bolts are arranged through the through holes, that is, the nuts are arranged on the side of the ear plates 211 away from the threaded holes.

[0028] When in use, one pulling bolt can be removed first, and then the other pulling bolt can be rotated to achieve the purpose of driving the adjustment plate 24 to move along the direction of the limit groove 242. When the adjustment plate 24 moves to the appropriate position, another pulling bolt is installed and tightened to achieve further stabilization of the adjustment plate 24.

[0029] The marking mechanism 4 includes a slide rail 41, which is connected to the upper surface of the positioning mechanism 3 by bolts. The slide rail 41 is set perpendicular to the blank. A marking rod 42 is slidably connected to the slide rail 41. The marking rod 42 is vertically set. A marking device 43 is slidably connected to the marking rod 42. The end of the marking device 43 away from the marking rod 42 is set to be a tip facing the blank, so as to draw lines on the blank.

[0030] A sleeve 431 is welded to the end of the marker 43 away from the tip. The sleeve 431 is coaxially sleeved with the marking rod 42 and can slide up and down along the sleeve 431. A top screw 4311 is threadedly connected to the side wall of the sleeve 431. The end of the top screw 4311 close to the marking rod 42 is abutted against the marking rod 42, and the other end of the top screw 4311 is arranged on the outside of the sleeve 431. The top screw 4311 can be tightened and limited along the sleeve 431, that is, after adjusting the height of the marker 43, it can be fixed by rotating the top screw 4311.

[0031] The punching mechanism 5 includes a second slide rail 51, which is connected to the upper surface of the positioning mechanism 3 by threads, and is arranged perpendicular to the blank, and is arranged on the side of the first slide rail 41 away from the supporting mechanism 2. An installation box 52 is slidably connected to the second slide rail 51, and the installation box 52 is a rectangular box, wherein the installation box 52 is open at one end facing the blank and at one end away from the blank.

[0032] The bottom of the installation box 52 is also threadedly connected with a lead screw 55, which is arranged parallel to the slide rail 51, and is arranged above the slide rail 51. The ends of the lead screw 55 are rotatably connected to the slide rail 51 through the mounting plate, and a hand wheel is welded to one end of the lead screw 55. Rotating the lead screw 55 can drive the installation box 52 to move along the direction of the slide rail 51.

[0033] The top of the installation box 52 is threadedly connected with a lead screw 53, the bottom of the lead screw 53 is inserted into the installation box 52, the top of the lead screw 53 is arranged outside the installation box 52, and a hand wheel is welded. The bottom of the lead screw 53 is rotatably connected to a puncher 54, which is rotatably connected to the lead screw 53 through a rectangular plate. The puncher 54 is a drilling machine, and a drill bit is installed at one end close to the blank for drilling holes in the blank.

[0034] Two vertical guide rods 56 are also provided in the installation box 52. The two guide rods 56 are symmetrically arranged about the screw 53, and the two ends of the guide rods 56 are respectively fixedly connected to the top and bottom ends of the installation box 52. Two sliders are welded on the rectangular plate on which the hole puncher 54 is installed. The two sliders are respectively slidably connected to the two guide rods 56, thereby realizing the sliding connection between the hole puncher 54 and the guide rods 56.

[0035] Usage process: First, support the blank on the driving wheel 22 and the driven wheel 241, then slide the positioning mechanism 3 to make the tip of the marker 43 touch the top of the blank, then draw a straight line, and then slide the positioning mechanism 3 to make the marker 43 away from the blank.

[0036] Secondly, the driving device 23 is turned on to drive the driving wheel 22 to rotate, thereby driving the blank to rotate a certain angle, and then the positioning mechanism 3 is slid to make the tip of the marker 43 contact the top of the blank, and then a straight line is drawn, and the positioning mechanism 3 is slid again to make the marker 43 away from the blank. The above process is repeated at least three times, and then the multiple straight lines drawn can form a polygon.

[0037] Finally, according to the geometric relationship, the center point of the polygon is found, which is the center point of the blank. At this time, the line drawing rod 42 is slid to a position where it will not interfere with the blank, and the positioning mechanism 3 is driven to make the puncher 54 abut against the blank, and then the lead screw 1 53 and the lead screw 2 55 are adjusted to make the puncher 54 abut against the center point, and the puncher 54 is turned on to punch a center hole on the blank.

[0038] To sum up, the present invention can achieve the purpose of driving the blank to rotate by setting up the driving device 23, and then drive the blank to rotate different angles for multiple times, and use the drawing mechanism 4 to carve a straight line at one end of the blank after each rotation angle, and a polygon is formed by the intersection of multiple straight lines. The center point of the polygon is the center hole position of the shaft blank, and then the punching mechanism 5 is used to punch the determined center point, so as to quickly determine the center hole position of the blank with poor outer circle uniformity, further solving the problems of time-consuming, labor-intensive, inaccurate and easy eccentricity of shaft forgings on the lathe, thereby improving the accuracy of subsequent processing and reducing the scrap rate.

[0039] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced by equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0040] In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0041] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0043] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A device for quickly locating the center hole of a shaft blank, characterized in that: The invention comprises a bed (1), wherein the bed (1) is provided with a support mechanism (2) for supporting a blank, wherein the support mechanism (2) is provided with a driving device (23) for driving the blank to rotate, and the bed (1) is also slidably connected with a positioning mechanism (3), wherein the positioning mechanism (3) is provided with a marking mechanism (4) and a punching mechanism (5).

2. The device for quickly locating the center hole of a shaft blank according to claim 1, characterized in that: The support mechanism (2) comprises a bottom plate (21), on which two driving wheels (22) and two driven wheels (241) are mounted, and the driving wheels (22) and the driven wheels (241) are respectively arranged on two sides of the blank to support the blank.

3. The device for quickly locating the center hole of a shaft blank according to claim 2, characterized in that: The two driving wheels (22) are mounted on a rotating shaft, and the rotating shaft is connected to the driving device (23) via a sprocket chain.

4. The device for quickly locating the center hole of a shaft blank according to claim 3, characterized in that: The two driven wheels (241) are rotatably connected to the adjustment plate (24); the adjustment plate (24) is provided with two limiting grooves (242); the limiting grooves (242) are arranged perpendicular to the rotating shaft; two limiting columns are connected to the bottom plate (21) corresponding to the limiting grooves (242); the limiting columns are inserted into the limiting grooves (242) to adjust the distance between the driving wheel (22) and the driven wheel (241).

5. The device for quickly locating the center hole of a shaft blank according to claim 4, characterized in that: The adjustment plate (24) is provided with two adjustment blocks (243), and the adjustment blocks (243) are provided with threaded holes. The bottom plate (21) is connected with two ear plates (211) corresponding to the adjustment blocks (243), and the ear plates (211) are provided with through holes corresponding to the threaded holes. The threaded holes are threadedly connected with pull bolts, and the pull bolts are arranged to pass through the through holes, and the pull bolts are arranged parallel to the limiting grooves (242).

6. The device for quickly locating the center hole of a shaft blank according to claim 1, characterized in that: The marking mechanism (4) comprises a slide rail (41), the slide rail (41) is connected to the positioning mechanism (3), the slide rail (41) is arranged perpendicular to the blank, a marking rod (42) is slidably connected to the slide rail (41), the marking rod (42) is arranged vertically, a marking device (43) is slidably connected to the marking rod (42), one end of the marking device (43) is arranged as a pointed end for marking on the blank.

7. The device for quickly locating the center hole of a shaft blank according to claim 6, characterized in that: The end of the marker (43) away from the tip is connected with a sleeve (431), and the sleeve (431) is sleeved on the marker rod (42). A top screw (4311) is threadedly connected on the side wall of the sleeve (431), and the end of the top screw (4311) close to the marker rod (42) abuts against the marker rod (42).

8. The device for quickly locating the center hole of a shaft blank according to claim 1, characterized in that: The punching mechanism (5) includes a second slide rail (51), the second slide rail (51) is connected to the positioning mechanism (3), the second slide rail (51) is arranged perpendicular to the blank, the second slide rail (51) is slidably connected to a mounting box (52), the top end of the mounting box (52) is threadedly connected to a lead screw (53), the bottom end of the lead screw (53) is extended into the mounting box (52) and is rotatably connected to a puncher (54), and the top end of the lead screw (53) is arranged on the outside of the mounting box (52).

9. The device for quickly locating the center hole of a shaft blank according to claim 8, characterized in that: The bottom of the installation box (52) is threadedly connected with a second lead screw (55), the second lead screw (55) is arranged parallel to the second slide rail (51), and both ends of the second lead screw (55) are rotatably connected to the second slide rail (51) through a mounting plate.

10. The device for quickly locating the center hole of a shaft blank according to claim 8, characterized in that: Two vertical guide rods (56) are also arranged in the installation box (52). The two guide rods (56) are symmetrically arranged about the lead screw (53), and the two ends of the guide rods (56) are respectively fixedly connected to the top and bottom ends of the installation box (52), and the puncher (54) is slidably connected to the guide rods (56) via a guide block.

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