Double-servo direct coupling driving mechanism for Z-axis of numerical control gantry machine tool

Abstract

A double servo direct connection driving mechanism of Z axis of numerical control gantry machine tool, it contains a slide, a machining spindle and a driving unit, the slide has a combination board and two combination columns, the combination board and the combination columns form a combination groove together, the machining spindle is vertically placed in the combination groove, the driving unit includes two driving motors and two screw rods, each driving motor is arranged on both sides of the machining spindle and is located on the same axis with the machining spindle, thereby, the driving motor is arranged on both sides of the machining spindle and is located on the same axis with the machining spindle, and the machining feeding efficiency is effectively improved.

Description

Technical Field

[0001] This utility model relates to a drive mechanism, specifically a dual servo direct-drive mechanism for the Z-axis of a CNC gantry milling machine. Background Technology

[0002] Existing gantry machining centers mainly consist of a crossbeam and two columns. Both ends of the crossbeam are connected to the columns, which provide good support for the crossbeam. (See reference...) Figure 7 As shown, a slide block 1 is provided on the crossbeam. A connecting groove 2 is recessed on the front side of the slide block 1. Two track grooves 3 are provided on the rear side of the connecting groove 2. A vertically mounted machining spindle 4 is connected in the connecting groove 2. A linear guide 5 is provided on the machining spindle 4 corresponding to the position of each track groove 3. Each linear guide 5 passes through each track groove 3, so that the machining spindle 4 can be driven by drive motors 6 provided on both sides to move up and down relative to the slide block 1 to perform machining operations on the workpiece.

[0003] However, the machining spindle 4 is only supported and slidable by two rear linear guides 5 (the center distance between the two linear guides 5 and the machining spindle 4 is relatively far), which makes the load-bearing capacity and stability of the machining spindle 4 significantly insufficient. This will cause the machining spindle 4 to sway left and right relative to the slide 1, thereby reducing the machining accuracy. Furthermore, since the machining spindle 4 and each of the drive motors 6 are not on the same axis and there is a wheelbase, the machining feed efficiency will be reduced.

[0004] In view of this, based on the author's many years of experience in manufacturing, developing and designing related products, and after detailed design and careful evaluation for the above objectives, the author has finally come up with a practical utility model. Utility Model Content

[0005] The purpose of this utility model is to provide a dual servo direct drive mechanism for the Z-axis of a CNC gantry milling machine. It has a simple structure, is easy to operate and maintain, can overcome the defects of the prior art, improve the machining feed efficiency, effectively improve the load-bearing capacity and stability of the machining spindle, and reduce the torsional torque.

[0006] To achieve the above objectives, this utility model discloses a dual servo direct-drive mechanism for the Z-axis of a CNC gantry milling machine, integrated with a crossbeam, characterized by comprising:

[0007] A slide block having a connecting plate and two connecting columns, the two connecting columns being arranged on the front side of the connecting plate, the two connecting columns facing each other and parallel to each other, and the connecting plate and the connecting columns together forming a connecting groove.

[0008] A machining spindle is vertically inserted into the mating groove of the slide;

[0009] A drive unit includes two drive motors and two screws. Each drive motor is located on both sides of the machining spindle and is fixed to the slide through a connecting seat. The drive motors are located on the same axis as the machining spindle. Each drive motor has an output shaft connected to each screw. A nut is fitted onto one end of each screw and is fixed to the machining spindle through a nut seat. The other end of each screw is pivotally mounted to the lower end of the connecting post. Each drive motor can drive each screw to rotate so that the nuts can move the machining spindle and cause the machining spindle to have axial displacement relative to the slide.

[0010] Each connecting column has at least one track groove on its inner side, and a linear guide is provided on both sides of the machining spindle corresponding to the position of each track groove, with each linear guide passing through each track groove.

[0011] Each output shaft is connected to each screw via a coupling, and each drive motor drives each screw to rotate through each coupling.

[0012] Each screw has at least one bearing fitted at both ends.

[0013] The upper and lower ends of the rear side of the connecting plate form a first connecting surface and a second connecting surface, respectively. The first connecting surface is provided with at least one upper track groove, and the second connecting surface is provided with at least one lower track groove. The distance between the first connecting surface and the connecting columns is greater than the distance between the second connecting surface and the connecting columns, so that the lower end of the connecting plate is concave and stepped. The front side of the crossbeam is provided with an upper rail and a lower rail respectively corresponding to the upper track groove and the lower track groove. The upper rail and the lower rail slide left and right along the upper track groove and the lower track groove, respectively, so that the slide block generates lateral displacement relative to the crossbeam.

[0014] The length of the machining spindle is greater than the length of the slide.

[0015] Based on the above structure, the advantages of this utility model are as follows:

[0016] 1. Improved machining feed efficiency: Since each of the drive motors is located on both sides of the machining spindle and on the same axis as the machining spindle (there is no wheelbase between the machining spindle and the drive motors), the machining feed efficiency can be improved.

[0017] 2. Improve the load-bearing capacity and stability of the machining spindle: Since the two linear guides are located on both sides of the machining spindle, rather than on the rear side as is the case in the conventional way, the center distance between each linear guide and the machining spindle is closer, which can improve the load-bearing capacity and stability of the machining spindle.

[0018] 3. Reduce torsional torque: Because the lower end of the connecting plate is concave and stepped, the distance between the lower track groove of the slide and the machining spindle is shorter, thereby reducing the torsional torque on the machining spindle during machining. Attached Figure Description

[0019] Figure 1 This is a perspective view of a preferred embodiment of the present invention.

[0020] Figure 2 This is a top view of a preferred embodiment of the present invention.

[0021] Figure 3 This is a side view of a preferred embodiment of the present invention.

[0022] Figure 4 This is an exploded view of a preferred embodiment of the present invention.

[0023] Figure 5 This is a cross-sectional view of a preferred embodiment of the present invention.

[0024] Figure 6 This is a schematic diagram of the crossbeam of this utility model.

[0025] Figure 7 This is a top view of the slide and machining spindle of a conventional gantry machining center. Detailed Implementation

[0026] Please see Figures 1 to 5 As shown, this utility model discloses a dual servo direct-drive mechanism for the Z-axis of a CNC gantry milling machine, which is connected to a crossbeam 40 and includes:

[0027] A slide block 10 has a connecting plate 11 and two connecting posts 12. The two connecting posts 12 are provided on the front side of the connecting plate 11. The two connecting posts 12 face each other and are parallel to each other. At least one track groove 121 is provided on the inner side of each connecting post 12. The connecting plate 11 and the connecting posts 12 together form a connecting groove 13. The upper and lower ends of the rear side of the connecting plate 11 respectively form a first connecting surface 111 and a second connecting surface 112. The distance between the first connecting surface 111 and the connecting posts 12 is greater than the distance between the second connecting surface 112 and the connecting posts 12, so that the lower end of the connecting plate 11 is concave and stepped. In addition, the first connecting surface 111 is provided with at least one upper track groove 1111, and the second connecting surface 112 is provided with at least one lower track groove 1121.

[0028] A machining spindle 20 is vertically inserted into the mating groove 13 of the slide block 10. A linear guide 21 is respectively provided on both sides of the machining spindle 20 corresponding to the positions of each track groove 121, and each linear guide 21 passes through each track groove 121.

[0029] The length of the machining spindle 20 is greater than the length of the slide block 10.

[0030] A drive unit 30 includes two drive motors 31 and two screws 32. Each drive motor 31 is mounted on both sides of the machining spindle 20 and is fixed to the slide block 10 via a connecting seat 313, and is located on the same axis L as the machining spindle 20. Each drive motor 31 has an output shaft 311, and each output shaft 311 is connected to each screw 32 by a coupling 312. At least one bearing 321 and a nut 32 are sleeved on one end of each screw 32. 2. The nut 322 is fixed to the machining spindle 20 through a nut seat 324, and the other end of each screw 32 is pivotally mounted on the lower end of the front side of the connecting column 12 and is fitted with at least one bearing 323. Thus, each drive motor 31 drives each screw 32 to rotate through each coupling 312, so that the nuts 322 are linked to the machining spindle 20, causing each linear guide 21 to slide up and down along each track groove 121, thereby causing the machining spindle 20 to generate axial displacement relative to the slide block 10.

[0031] See Figure 6 and paired Figure 2 As shown, in use, this utility model is combined with the crossbeam 40. The front side of the crossbeam 40 is provided with an upper linear rail 41 and a lower linear rail 42 respectively corresponding to the upper track groove 1111 and the lower track groove 1121. The upper linear rail 41 and the lower linear rail 42 can slide left and right along the upper track groove 1111 and the lower track groove 1121 respectively, so that the slide block 10 generates lateral displacement relative to the crossbeam 40. At the same time, each drive motor 31 drives each screw 32 to rotate through each coupling 312, so that each linear rail 21 slides up and down along each track groove 121, thereby causing the machining spindle 20 to generate axial displacement relative to the slide block 10, so as to perform machining operations on a workpiece (not shown in the figure).

[0032] It is worth mentioning that you should continue to refer to Figure 2 As shown, since each of the drive motors 31 is located on both sides of the machining spindle 20 and is on the same axis L as the machining spindle 20 (there is no wheelbase between the machining spindle 20 and the drive motors 31), the machining feed efficiency can be improved.

[0033] In addition, since the two linear guides 21 are located on both sides of the machining spindle 20, rather than on the rear side of the spindle as is customary, the center distance between each linear guide 21 and the machining spindle 20 is closer, which can improve the load-bearing capacity and stability of the machining spindle 20.

[0034] Please refer to further reading Figure 3As shown, because the lower end of the connecting plate 11 is concave and stepped, the distance between the lower track groove 1121 of the slide block 10 and the machining spindle 20 is relatively short, so as to reduce the torsional torque on the machining spindle 20 during machining.

Claims

1. A dual servo direct-drive mechanism for the Z-axis of a CNC gantry milling machine, integrated with a crossbeam, characterized in that... Include: A slide block having a connecting plate and two connecting columns, the two connecting columns being arranged on the front side of the connecting plate, the two connecting columns facing each other and parallel to each other, and the connecting plate and the connecting columns together forming a connecting groove. A machining spindle is vertically inserted into the mating groove of the slide; A drive unit includes two drive motors and two screws. Each drive motor is located on both sides of the machining spindle and is fixed to the slide through a connecting seat. The drive motors are located on the same axis as the machining spindle. Each drive motor has an output shaft connected to each screw. A nut is fitted onto one end of each screw and is fixed to the machining spindle through a nut seat. The other end of each screw is pivotally mounted to the lower end of the connecting post. Each drive motor can drive each screw to rotate so that the nuts can move the machining spindle and cause the machining spindle to have axial displacement relative to the slide.

2. The dual servo direct-drive mechanism for the Z-axis of a CNC gantry milling machine as described in claim 1, characterized in that, Each connecting column has at least one track groove on its inner side. A linear guide is provided on both sides of the machining spindle at the position corresponding to each track groove, and each linear guide passes through each track groove.

3. The dual servo direct-drive mechanism for the Z-axis of a CNC gantry milling machine as described in claim 1, characterized in that, Each output shaft is connected to each screw via a coupling, and each drive motor drives each screw to rotate through each coupling.

4. The dual servo direct-drive mechanism for the Z-axis of a CNC gantry milling machine as described in claim 1, characterized in that, Each screw has at least one bearing fitted at both ends.

5. The dual servo direct-drive mechanism for the Z-axis of a CNC gantry milling machine as described in claim 1, characterized in that, The upper and lower ends of the rear side of the connecting plate form a first connecting surface and a second connecting surface, respectively. The first connecting surface is provided with at least one upper track groove, and the second connecting surface is provided with at least one lower track groove. The distance between the first connecting surface and the connecting columns is greater than the distance between the second connecting surface and the connecting columns, so that the lower end of the connecting plate is concave and stepped. The front side of the crossbeam is provided with an upper rail and a lower rail respectively corresponding to the upper track groove and the lower track groove. The upper rail and the lower rail slide left and right along the upper track groove and the lower track groove respectively, so that the slide block generates lateral displacement relative to the crossbeam.

6. The dual servo direct-drive mechanism for the Z-axis of a CNC gantry milling machine as described in claim 1, characterized in that, The length of the machining spindle is greater than the length of the slide.

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