Head saddle structure of long-stroke double drive of Z axis of numerical control gantry machine tool

Abstract

A CNC gantry machine tool Z-axis long-stroke double-drive head saddle structure includes a slide, a machining spindle and a driving unit, the front side of the slide is recessed with a combination groove, the inner bottom surface of the combination groove is respectively formed with a first assembly surface and a second assembly surface, the first assembly surface and the second assembly surface respectively extend to the opening direction of the combination groove to form a third assembly surface and a fourth assembly surface, each assembly surface is respectively provided with at least one track groove, the two sides of the machining spindle are respectively provided with a linear rail corresponding to each track groove position, each linear rail is arranged in each track groove, thus, in the utility model, each linear rail is arranged on the two sides of the machining spindle, instead of being arranged on the rear side of the spindle as in the prior art, so that the center distance between each linear rail and the machining spindle is close, and the slide is wrapped around the machining spindle on four sides, so that the load capacity and stability of the machining spindle are improved.

Description

Technical Field

[0001] This utility model relates to a head saddle structure, specifically a head saddle structure for a long-stroke dual-drive CNC gantry milling machine's Z-axis. 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 8 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 sliding rails 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 sliding rail 3. Each linear guide 5 passes through each sliding rail 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 head saddle structure for a long-stroke dual-drive CNC gantry milling machine with a Z-axis. It has a simple structure, is easy to operate and maintain, overcomes the defects of the prior art, and can effectively improve the load-bearing capacity and stability of the machining spindle, thereby improving machining feed efficiency.

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

[0007] A slide block has a recessed joint groove on its front side. A first assembly surface and a second assembly surface are formed on both sides of the inner bottom surface of the joint groove. The first assembly surface and the second assembly surface are opposite to each other and are arranged in parallel. The first assembly surface extends towards the opening direction of the joint groove to form a first connecting surface and a third assembly surface. The second assembly surface extends towards the opening direction of the joint groove to form a second connecting surface and a fourth assembly surface. The first connecting surface and the second connecting surface, as well as the third assembly surface and the fourth assembly surface, are also opposite to each other and are arranged in parallel. Each assembly surface is provided with at least one track groove along a first direction.

[0008] A machining spindle is vertically inserted into the mating groove of the slide. A linear guide is provided on both sides of the machining spindle corresponding to the positions of each track groove, and each linear guide passes through each track groove.

[0009] The device also includes a drive unit comprising two drive motors and two screws. Each drive motor is located on both sides of the machining spindle and is fixed to the upper end of the slide corresponding to the first and second connecting surfaces via a connecting seat, and is coaxial with the machining spindle. Each drive motor has an output shaft, and each output shaft is connected to the screw via a coupling. One end of each screw is fitted with a nut, which is fixed to the machining spindle via a nut seat. The other end of each screw is pivotally mounted to the lower end of the slide. Each drive motor drives the screw to rotate via the coupling, so that the nuts move the machining spindle so that the machining spindle can generate axial displacement relative to the slide.

[0010] Each screw has at least one bearing fitted at both ends.

[0011] The slide has a connecting portion protruding towards the crossbeam along a second direction perpendicular to the first direction on its rear side. A first connecting surface is formed at the bottom of the connecting portion. At least one first track groove is provided on the first connecting surface along a third direction perpendicular to both the first and second directions. A second connecting surface and a third connecting surface are formed on the rear side of the slide below the connecting portion. The included angle between the second and third connecting surfaces and the first connecting surface is 90 degrees. At least one second track groove and one third track groove are provided on the second and third connecting surfaces along the third direction. The first track groove, the second track groove, and the third track groove are all parallel to each other. A first linear guide, a second linear guide, and a third linear guide are respectively provided on the front side of the crossbeam corresponding to the first, second, and third track grooves. The first, second, and third linear guides slide left and right along the first, second, and third track grooves to cause the slide to move laterally relative to the crossbeam.

[0012] Wherein, the first direction is the Z-axis direction, the second direction is the Y-axis direction, and the third direction is the X-axis direction.

[0013] The distance between the first connecting surface and the second connecting surface is greater than the distance between the first assembly surface and the second assembly surface, and the distance between the third assembly surface and the fourth assembly surface.

[0014] A fixing plate is provided on the front side of the third assembly surface and the fourth assembly surface so that the slide covers the machining spindle on all four sides.

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

[0016] 1. Improve the load-bearing capacity and stability of the machining spindle: Since each linear guide is located on both sides of the machining spindle, rather than on the rear side as is the conventional method, the center distance between each linear guide and the machining spindle is closer. At the same time, the slide system covers the machining spindle on all four sides, increasing the contact area between the machining spindle and each guide groove, thereby reducing the strain of the machining spindle under stress and improving the load-bearing capacity and stability of the machining spindle.

[0017] 2. Improve 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. Attached Figure Description

[0018] Figure 1 This is a perspective view of a preferred embodiment of the present invention.

[0019] Figure 2 This is a top view of a preferred embodiment of the present invention.

[0020] Figure 3 This is a side view of a preferred embodiment of the present invention.

[0021] Figure 4 This is an exploded view of a preferred embodiment of the present invention.

[0022] Figure 5 This is a top view of the slide of a preferred embodiment of the present invention.

[0023] Figure 6 This is a cross-sectional view of a preferred embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the crossbeam of this utility model.

[0025] Figure 8 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 6As shown, this utility model discloses a head saddle structure for a long-stroke dual-drive Z-axis of a CNC gantry milling machine, which is used to connect to a crossbeam 40, and includes:

[0027] A slide block 10 has a recessed engagement groove 11 on its front side. A first assembly surface 12 and a second assembly surface 13 are formed on both sides of the inner bottom surface of the engagement groove 11. The first assembly surface 12 and the second assembly surface 13 are opposite to each other and parallel to each other. The first assembly surface 12 extends towards the opening direction of the engagement groove 11 to form a first connecting surface 14 and a third assembly surface 15. The second assembly surface 13 extends towards the opening direction of the engagement groove 11 to form a second connecting surface 16 and a fourth assembly surface 17. The first connecting surface 14 and the second connecting surface 16, and the third assembly surface 15 and the fourth assembly surface 17 are also opposite to each other and parallel to each other. Each assembly surface 12, 13, 15, and 17 is provided with at least one track groove 121, 131, 151, and 171 along a first direction. Furthermore, the slide block 1... A connecting portion 101 protrudes from the rear side of the slide block 10 along a second direction perpendicular to the first direction and toward the crossbeam 40. A first connecting surface 102 is formed at the bottom of the connecting portion 101. At least one first track groove 1021 is provided on the first connecting surface 102 along a third direction perpendicular to the first direction and the second direction. A second connecting surface 103 and a third connecting surface 104 are formed on the rear side of the slide block 10 below the connecting portion 101. The included angle between the second connecting surface 103, the third connecting surface 104 and the first connecting surface 102 is 90 degrees. At least one second track groove 1031 and a third track groove 1041 are provided on the second connecting surface 103 and the third connecting surface 104 along the third direction. The first track groove 1021 is parallel to the second track groove 1031 and the third track groove 1041.

[0028] The distance between the first connecting surface 14 and the second connecting surface 16 is greater than the distance between the first assembly surface 12 and the second assembly surface 13, and the distance between the third assembly surface 15 and the fourth assembly surface 17.

[0029] Wherein, the first direction system is the Z-axis direction, the second direction system is the Y-axis direction, and the third direction system is the X-axis direction.

[0030] A machining spindle 20 is vertically inserted into the mating groove 11 of the slide block 10. On both sides of the machining spindle 20, corresponding to the track grooves 121, 131, 151, and 171, a linear guide 21, 22, 23, and 24 are respectively installed, and each linear guide 21, 22, 23, and 24 passes through the track grooves 121, 131, 151, and 171.

[0031] A fixing plate 18 is provided on the front side of the third assembly surface 15 and the fourth assembly surface 17, so that the slide 10 covers the machining spindle 20 on all four sides, so that the slide 10 and the machining spindle 20 are more tightly and firmly connected.

[0032] 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 upper end of the slide block 10 corresponding to the first connecting surface 14 and the second connecting surface 16 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 screw thread are sleeved on one end of each screw 32. 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 to the lower end of the slide 10 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 drive the machining spindle 20, causing each linear guide 21, 22, 23, 24 to slide up and down along each track groove 121, 131, 151, 171, thereby causing the machining spindle 20 to generate axial displacement relative to the slide 10.

[0033] See Figure 7 and pair Figure 2 As shown, in use, this utility model is integrated with the crossbeam 40. The front side of the crossbeam 40 is provided with a first linear guide 41, a second linear guide 42, and a third linear guide 43 respectively corresponding to the first track groove 1021, the second track groove 1031, and the third track groove 1041. The first linear guide 41, the second linear guide 42, and the third linear guide 43 can slide left and right along the first track groove 1021, the second track groove 1031, and the third track groove 1041 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 guide 21, 22, 23, 24 slides up and down along each track groove 121, 131, 151, 171, 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).

[0034] 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.

[0035] In addition, since the linear guides 21, 22, 23, and 24 are located on both sides of the machining spindle 20, rather than on the rear side as is customary, the center distance between the linear guides 21, 22, 23, and 24 and the machining spindle 20 is closer. At the same time, the slide 10 covers the machining spindle 20 on all four sides, increasing the contact area between the machining spindle 20 and the track grooves 121, 131, 151, and 171, thereby reducing the strain of the machining spindle 20 under stress and improving the load-bearing capacity and stability of the machining spindle 20.

Claims

1. A head saddle structure for a long-stroke dual-drive Z-axis of a CNC gantry milling machine, integrated with a crossbeam, characterized in that... Include: A slide block has a recessed joint groove on its front side. A first assembly surface and a second assembly surface are formed on both sides of the inner bottom surface of the joint groove. The first assembly surface and the second assembly surface are opposite to each other and are arranged in parallel. The first assembly surface extends towards the opening direction of the joint groove to form a first connecting surface and a third assembly surface. The second assembly surface extends towards the opening direction of the joint groove to form a second connecting surface and a fourth assembly surface. The first connecting surface and the second connecting surface, as well as the third assembly surface and the fourth assembly surface, are also opposite to each other and are arranged in parallel. Each assembly surface is provided with at least one track groove along a first direction. A machining spindle is vertically inserted into the mating groove of the slide. A linear guide is provided on both sides of the machining spindle corresponding to the positions of each track groove, and each linear guide passes through each track groove.

2. The head saddle structure of the long-stroke dual-drive Z-axis of the CNC gantry milling machine as described in claim 1, characterized in that, It also includes a drive unit, which includes two drive motors and two screws. Each drive motor is located on both sides of the machining spindle and is fixed to the upper end of the slide corresponding to the first and second connecting surfaces through a connecting seat, and is located on the same axis as the machining spindle. Each drive motor has an output shaft, and each output shaft is connected to the screws by a coupling. A nut is fitted on one end of each screw, and the nut is fixed to the machining spindle through a nut seat. The other end of each screw is pivotally mounted on the lower end of the slide. Each drive motor drives the screws to rotate through the couplings, so that the nuts can move the machining spindle so that the machining spindle can generate axial displacement relative to the slide.

3. The head saddle structure of the long-stroke dual-drive Z-axis of the CNC gantry milling machine as described in claim 2, characterized in that, Each screw has at least one bearing fitted at both ends.

4. The head saddle structure of the long-stroke dual-drive Z-axis of the CNC gantry milling machine as described in claim 1, characterized in that, The rear side of the slide block has a connecting portion protruding towards the crossbeam along a second direction perpendicular to the first direction. A first connecting surface is formed at the bottom of the connecting portion. At least one first track groove is provided on the first connecting surface along a third direction perpendicular to the first and second directions. A second connecting surface and a third connecting surface are formed on the rear side of the slide block below the connecting portion. The included angle between the second and third connecting surfaces and the first connecting surface is 90 degrees. At least one second track groove and one third track groove are provided on the second and third connecting surfaces along the third direction. The first track groove, the second track groove, and the third track groove are all arranged parallel to each other. A first linear guide, a second linear guide, and a third linear guide are respectively provided on the front side of the crossbeam corresponding to the first, second, and third track grooves. The first, second, and third linear guides slide left and right along the first, second, and third track grooves to cause the slide block to have lateral displacement relative to the crossbeam.

5. The head saddle structure of the long-stroke dual-drive Z-axis of the CNC gantry milling machine as described in claim 4, characterized in that, The first direction is the Z-axis direction, the second direction is the Y-axis direction, and the third direction is the X-axis direction.

6. The head saddle structure of the long-stroke dual-drive Z-axis of the CNC gantry milling machine as described in claim 1, characterized in that, The distance between the first connecting surface and the second connecting surface is greater than the distance between the first assembly surface and the second assembly surface, and the distance between the third assembly surface and the fourth assembly surface.

7. The head saddle structure of the long-stroke dual-drive CNC gantry milling machine Z-axis as described in claim 1, characterized in that, A fixing plate is provided on the front side of the third assembly surface and the fourth assembly surface so that the slide covers the machining spindle on all four sides.

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