A power head structure

Abstract

The present invention discloses a power head structure, which comprises a housing and a main shaft, wherein a screw rod (3) and a first bracket (14) are supported and installed on the housing, wherein a first through hole is provided in the axial direction of the first bracket, and a second through hole is provided in the radial direction, and the screw rod is arranged in parallel with the first through hole; a second bracket (5) is installed on the screw rod through a threaded connection, a third bracket (7) is installed on the second bracket through a bearing support, a roller (8) is installed on the third bracket, a slider (6) is installed in the second through hole, inclined surfaces are respectively provided on both sides of the slider, the inclined surfaces are slidably connected with the roller, and the slider is fixedly connected with a hollow shaft (15), the main shaft is installed in the hollow shaft through a bearing support, and a lateral movement gap is left between the main shaft and the inner wall of the first through hole. The present invention can process a circular hole exceeding the diameter of a tool and ensure the processing accuracy of the circular hole.

Description

Technical Field

[0001] The invention relates to a power head structure. Background Art

[0002] The position of the machining spindle of the CNC machining center power head currently used in the market cannot be changed, so when machining a circular hole that exceeds the tool diameter, the circular hole can only be machined by coordinating the X and Y axis linkage of the workpiece. This large-diameter circular hole machining method is prone to wear due to the frequent use of the X and Y axis guide rails on which the workpiece runs. After the X and Y axis guide rails are worn, the roundness machining accuracy of the circular hole will decrease. Summary of the invention

[0003] The technical problem to be solved by the present invention is that, in view of the shortcomings of the existing machining center power head in machining circular holes larger than the tool diameter with low precision and low efficiency, the present invention provides a power head structure that can machine circular holes exceeding the tool diameter with high machining precision.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A power head structure comprises a housing, a spindle and a first driving mechanism, one end of the spindle is connected to the first driving mechanism, and the other end is equipped with a tool, wherein:

[0006] A screw rod and a first bracket are mounted on the housing via bearing support, a first through hole is formed in the axial direction of the first bracket, a second through hole is formed in the radial direction, and the screw rod is arranged parallel to the first through hole;

[0007] The second bracket is installed on the screw rod through a threaded connection, the third bracket is installed on the second bracket through a bearing support, the roller is installed on the third bracket, a slider is installed in the second through hole, inclined surfaces are respectively arranged on both sides of the slider, the inclined surfaces are slidably connected with the roller, and the slider is fixedly connected with the hollow shaft, the axis of the hollow shaft is parallel to the axis of the first bracket, the main shaft is installed in the hollow shaft through a bearing support, and a lateral movement gap is left between the main shaft and the inner wall of the first through hole;

[0008] The screw rod is connected to the second driving mechanism, and the first bracket is connected to the third driving mechanism;

[0009] In the initial state, the axis of the first bracket coincides with the axis of the main shaft; when the second driving mechanism drives the screw to rotate, the axis of the main shaft produces a lateral deflection relative to the axis of the first bracket; when the third driving mechanism drives the first bracket to rotate, the axis of the main shaft performs a circular motion around the axis of the first bracket.

[0010] The present invention drives the screw rod through the second driving mechanism, so that the second bracket installed on the screw rod moves upward or downward, and further moves the roller installed on the third bracket upward or downward, so that the slider connected to the roller through the inclined surface slides with the main shaft together with the lateral deflection (that is, the center of the main shaft deviates laterally), so that the lateral processing position of the main shaft can be changed. On this basis, the present invention can drive the first bracket to rotate through the third driving mechanism. Since the main shaft and the slider are both installed on the first bracket, the main shaft and the slider rotate around the axis of the first bracket together with the first bracket to make a circular motion, that is, the axis of the main shaft makes a circular motion around the axis of the first bracket. In this way, the present invention replaces the X and Y axis movement of the workpiece in the traditional processing method by changing the lateral processing position and the longitudinal processing position of the main shaft, and can realize the processing of a circular hole larger than the tool diameter through the lateral deflection of the main shaft and the circular motion formed by the rotation of the main shaft with the first bracket. In addition, the present invention can also realize the processing of circular holes at different positions on the processing surface of the workpiece by moving the main shaft when the workpiece does not move. Since the processing of the circular hole is realized by the precisely controlled displacement of the main shaft, the processing accuracy of the circular hole can be guaranteed.

[0011] To ensure smooth up and down movement of the roller, a guide rod is installed on the shell, the guide rod is installed parallel to the screw rod, and the second bracket is slidably installed on the guide rod. The up and down movement of the second bracket along the guide rod can ensure smooth up and down movement of the roller on the third bracket.

[0012] In order to improve the lateral deflection speed and stability of the slider, the rollers are respectively installed at both ends of the third bracket, and the inclined surfaces are respectively arranged at both ends of the slider.

[0013] Preferably, the hollow shaft is centrally arranged in the first through hole.

[0014] Preferably, it also includes a grating ruler for accurately controlling the spindle runout.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention changes the transverse processing position and the longitudinal processing position of the spindle, and can not only realize the processing of circular holes exceeding the tool diameter through the circular motion formed by the lateral deflection of the spindle and the rotation of the first bracket, and ensure the processing accuracy of the circular holes, but also realize the processing of circular holes at different positions on the processing surface of the workpiece without moving the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a front view cross-sectional structural diagram of the structure of the present invention.

[0019] Figure 2 for Figure 1 A-A section view.

[0020] Figure 3 for Figure 1 B-B section view.

[0021] Figure 4 It is a top view of the structure of the present invention.

[0022] In the figure: 1. lower support; 2. side plate; 3. screw; 4. bearing; 5. second bracket; 6. slider; 7. third bracket; 8. roller; 9. bearing; 10. upper support; 11. transmission wheel; 12. bearing; 13. transmission wheel; 14. first bracket; 15. hollow shaft; 16. transmission wheel; 17. bearing; 18. main shaft; 19. motor mounting plate; 20. first drive mechanism; 21. transmission wheel; 22. second drive mechanism; 23. transmission wheel; 24. third drive mechanism; 25. transmission wheel; 26. guide rod. DETAILED DESCRIPTION

[0023] The present invention is further described below in conjunction with specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0024] For the convenience of description, the relative position relationship of each component, such as up, down, left, right, etc., is described according to the layout direction of the drawings in the specification, and does not limit the structure of this patent.

[0025] like Figure 1 - Figure 4 As shown, an embodiment of the power head structure of the present invention includes a housing, a main shaft 18 and a first driving mechanism 20. One end of the main shaft 18 is connected to a transmission wheel 21 on the first driving mechanism 20 via a transmission wheel 16, and a tool is installed at the other end.

[0026] The housing includes an upper support 10 and a lower support 1, and the upper support 10 and the lower support 1 support a screw rod 3 via a bearing 9, and support a first bracket 14 via a bearing 12. The first bracket 14 has a first through hole axially opened and a second through hole radially opened, and the screw rod 3 is arranged parallel to the first through hole.

[0027] The screw rod 3 is provided with a transmission wheel 11, which is connected to a transmission wheel 23 on a second driving mechanism 22 via a transmission mechanism. The screw rod 3 is also provided with a second bracket 5 via a threaded connection, and the second bracket 5 is supported by a third bracket 7 via a bearing 4, and rollers 8 are respectively installed at both ends of the third bracket 7, and a slider 6 is installed in the second through hole, and the ends of both sides of the slider 6 are respectively provided with inclined surfaces with the same inclination angle, and the inclined surfaces are slidably connected with the rollers 8, and a hollow shaft 15 is fixedly installed in the middle of the slider 6. The axis of the hollow shaft 15 is parallel to the axis of the first bracket 14, and the main shaft 18 is supported by a bearing 17 and installed in the hollow shaft 15, and a lateral movement gap is left between the main shaft 18 and the inner wall of the first through hole, and in the initial state, the axis of the first bracket 14 coincides with the axis of the main shaft 18.

[0028] The transmission wheel 13 is installed on the first bracket 14 , and the transmission wheel 13 is connected to the transmission wheel 25 on the third driving mechanism 24 .

[0029] In order to ensure the smooth lateral movement of the main shaft 18 , a guide rod 26 is installed on the housing. The guide rod 26 is installed parallel to the screw rod 3 , and the second bracket 5 is slidably installed on the guide rod 26 .

[0030] In order to ensure the movement accuracy of the spindle 15, the power head structure of the present invention also includes a grating ruler (not shown in the figure) for accurately controlling the runout of the spindle.

[0031] The transmission wheels mentioned in this embodiment can be transmission parts such as synchronous wheels, sprockets, or gears.

[0032] The power head structure of the present invention can be used for processing circular holes exceeding the diameter of the tool, and can also be used for processing circular holes at different positions on the same processing surface.

[0033] When the present invention is used for processing a circular hole exceeding the tool diameter, the first driving mechanism 20 is used to drive the spindle 18 and the tool to rotate, so that the spindle 18 completes the processing of the processing area within the tool processing radius at the initial position. Then, the second driving mechanism 22 drives the screw 3 to rotate. Since the axial direction of the screw 3 is limited by the upper support 10 and the lower support 1, the second bracket 5 on the screw 3 moves upward or downward along the guide rod 26 with the rotation of the screw 3, and the third bracket 7 and the roller 8 move upward or downward together with the second bracket 5. At the same time, the roller 8 pushes the slider 6, so that the slider 6 and the spindle 18 are carried together in the first bracket 14 to achieve lateral deflection along the radial direction of the first bracket 14, that is, the spindle 18 is moved horizontally one step relative to its initial position on the workpiece processing surface. Then, the spindle 18 and the tool continue to rotate for processing, and at the same time, the third drive mechanism 24 drives the first bracket 14 to rotate, and the first bracket 14 rotates with the slider 6 and the spindle 18 installed thereon, so that the spindle 18 rotates along its initial position while rotating (at this time, the rotation of the spindle 18 includes the self-rotation of the spindle 18 itself and the revolution of the spindle 18 around its initial position) to achieve circular motion, so that the processing area that the spindle 18 cannot process when it is in the initial position can be processed. The spindle deflection and rotation processing are repeated in this way until the overall processing of the circular hole exceeding the tool diameter is completed. Obviously, the present invention can achieve precise control of the processing position of the spindle 18 through the grating ruler during the processing position adjustment process of the spindle 18.

[0034] When the present invention is used for processing circular holes at different positions on the same processing surface, a circular hole can be positioned and processed first. After that, the screw rod 3 is driven to rotate by the second driving mechanism 22, so that the slider 6 and the spindle 18 are carried together in the first bracket 14 to realize lateral deflection along the radial direction of the first bracket 14, that is, the spindle 18 is moved lateraly on the workpiece processing surface relative to its initial position, and then the spindle 18 is moved longitudinally on the workpiece processing surface by the rotation of the first bracket 14, so as to locate the next circular hole. This process is repeated to realize the processing of circular holes at different positions on the same processing surface.

[0035] The above is only a specific implementation scheme of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the art can make many possible changes and modifications to the technical scheme of the present invention by using the technical content disclosed above without departing from the scope of the technical scheme of the present invention, or modify it into an equivalent embodiment of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical scheme of the present invention should fall within the protection scope of the technical scheme of the present invention.

Claims

1. A power head structure, comprising a housing, a spindle and a first driving mechanism, one end of the spindle is connected to the first driving mechanism, and the other end is equipped with a tool, Features: A screw rod (3) and a first bracket (14) are mounted on the housing via bearing support, the first bracket has a first through hole in the axial direction and a second through hole in the radial direction, and the screw rod is arranged parallel to the first through hole; The second bracket (5) is installed on the screw rod via a threaded connection, the third bracket (7) is installed on the second bracket via a bearing support, the roller (8) is installed on the third bracket, a slider (6) is installed in the second through hole, inclined surfaces are respectively arranged on both sides of the slider, the inclined surfaces are slidably connected to the roller, and the slider is fixedly connected to the hollow shaft (15), the axis of the hollow shaft is parallel to the axis of the first bracket, the main shaft is installed in the hollow shaft via a bearing support, and a lateral movement gap is left between the main shaft and the inner wall of the first through hole; The screw rod is connected to the second driving mechanism, and the first bracket is connected to the third driving mechanism; In the initial state, the axis of the first bracket coincides with the axis of the main shaft; When the second driving mechanism drives the screw to rotate, the axis of the main shaft generates a lateral deflection relative to the axis of the first bracket; When the third driving mechanism drives the first bracket to rotate, the axis of the main shaft performs a circular motion around the axis of the first bracket.

2. The power head structure according to claim 1, It is characterized in that A guide rod (26) is installed on the housing, the guide rod is installed parallel to the screw rod, and the second bracket is slidably installed on the guide rod.

3. The power head structure according to claim 1, It is characterized in that The rollers are respectively installed at two ends of the third bracket, and the inclined surfaces are respectively arranged at two ends of the sliding block.

4. The power head structure according to claim 1, It is characterized in that Also included is an optical scale for precise control of spindle runout.

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