Crown block type gantry machining center capable of offsetting magnetic attraction

Abstract

The crown block type gantry machining center capable of offsetting the magnetic attraction comprises two symmetrically-arranged stand columns, a cross beam and two sets of linear motors, the top ends of the stand columns are provided with L-shaped step portions towards the inner sides, and the cross beam is arranged on the step portions of the stand columns in a sliding mode through a first guide rail assembly and a second guide rail assembly. The first guide rail assembly is horizontally arranged between the bottom of the cross beam and the horizontal plane of the step part, and the second guide rail assembly and the linear motor are vertically arranged between the side face of the cross beam and the vertical plane of the step part. According to the utility model, the horizontally arranged linear motor is changed into the vertically arranged linear motor and is matched with the horizontally and vertically arranged guide rail assembly, so that the magnetic attraction of the primary component of the linear motor is offset, and the magnetic attraction of the secondary component of the linear motor is borne by the upright post, so that the guide rail assembly does not bear the magnetic attraction any more, thereby reducing the load of the guide rail assembly and prolonging the service life.

Description

Technical Field

[0001] The utility model relates to the technical field of machine tools, in particular to an overhead gantry machining center for offsetting magnetic attraction force. Background Art

[0002] A gantry machining center is a machining center with a spindle axis perpendicular to the workbench, and its overall structure is arranged in a gantry frame layout. The overhead five-axis gantry machining center is an advanced numerical control machining equipment, which has the capabilities of multi-axis linkage and high-precision machining, and can meet the machining requirements of complex workpieces. It plays an important role in improving production efficiency and machining quality.

[0003] A linear motor is a transmission device that directly converts electrical energy into linear motion mechanical energy without any intermediate conversion mechanism. Currently on the market, linear motors all adopt the flat laying method as shown in Figure 1 However, this laying method, although simple and convenient, has great defects: (1) There is a magnetic attraction force of up to tens of thousands of Newtons between the primary component and the secondary component of the linear motor, which jointly leads to an increase in the load on the linear guide rail, thereby reducing the service life of the guide rail and increasing costs; (2) With the wide use of linear motors on overhead gantries, the acceleration of the crossbeam is getting faster and faster, and the tipping moment during the acceleration and deceleration of the crossbeam is getting larger and larger, which is likely to cause the crossbeam to tilt forward and backward, affecting the structural stability and machining accuracy. Summary of the Utility Model

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide an overhead gantry machining center for offsetting magnetic attraction force, which is used to solve the problem of excessive load on the guide rail caused by the magnetic attraction force generated by the flat laying of linear motors in the prior art.

[0005] To achieve the above purpose and other related purposes, the present utility model provides an overhead gantry machining center for offsetting magnetic attraction force, including two symmetrically arranged columns, a crossbeam, and two groups of linear motors. The top of the column is provided with an "L"-shaped step portion towards the inside. The crossbeam is slidably arranged on the step portion of the column through a first guide rail assembly and a second guide rail assembly. The first guide rail assembly is horizontally arranged between the bottom of the crossbeam and the horizontal plane of the step portion, and the second guide rail assembly and the linear motors are both vertically arranged between the side surface of the crossbeam and the vertical surface of the step portion.

[0006] In an embodiment of the present utility model, the horizontal heights of the two first guide rail assemblies / the two second guide rail assemblies / the two linear motors located on the two columns are the same.

[0007] In an embodiment of the present utility model, the second guide rail assembly is located above the linear motor.

[0008] In an embodiment of the present utility model, the second guide rail assembly is located at the top of the inner side of the step portion.

[0009] In an embodiment of the present utility model, the first guide rail assembly / second guide rail assembly includes a guide rail and a sliding table. The guide rail is installed on the column, and the sliding table is installed on the cross beam.

[0010] In an embodiment of the present utility model, the primary component of the linear motor is connected to the cross beam, and the secondary component of the linear motor is connected to the column.

[0011] In an embodiment of the present utility model, the center of the linear motor and the center of gravity of the cross beam are at the same horizontal height.

[0012] In an embodiment of the present utility model, a transverse sliding table is slidably arranged on the cross beam. A longitudinal sliding table capable of lifting is arranged on the transverse sliding table. A self-locking chuck is arranged at the lower part of the longitudinal sliding table, and a processing tool is arranged in the self-locking chuck.

[0013] As described above, a gantry type machining center for offsetting magnetic attraction of the present utility model has the following beneficial effects: In the present utility model, the horizontally arranged linear motor is changed to a vertically arranged one and is matched with the horizontally and vertically arranged guide rail assemblies, so that the magnetic attractions of the primary components of the linear motor cancel each other out, and the magnetic attraction of the secondary component of the linear motor is borne by the column, so that the guide rail assemblies no longer bear the magnetic attraction, thereby reducing the load of the guide rail assemblies and increasing the service life. In addition, since the position of the linear guide rail rises from the bottom of the cross beam to the middle of the cross beam, the distance from the center of gravity of the cross beam is shortened, the overturning moment during driving is reduced, and the overturning moment is borne by the second guide rail assembly arranged vertically above, so that the cross beam no longer has the tendency of tilting forward and backward during acceleration and deceleration. Furthermore, with the same span, the length of the cross beam is shortened through the setting of the step portion, the weight of the cross beam is reduced, which is beneficial to light weight and high speed. Description of the Drawings

[0014] Figure 1 It shows a schematic structural diagram of a gantry type machining center disclosed in the prior art.

[0015] Figure 2 It shows a schematic structural diagram of a gantry type machining center for offsetting magnetic attraction disclosed in an embodiment of the present utility model.

[0016] Description of the Component Labels

[0017] 1. Column; 11. Step portion; 2. Cross beam; 3. Linear motor; 4. First guide rail assembly; 5. Second guide rail assembly; 6. Transverse sliding table; 7. Longitudinal sliding table; 8. Self-locking fixture. Detailed Embodiments

[0018] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0019] Please refer to Figure 2 , the present utility model provides an overhead gantry machining center for offsetting magnetic attraction, which includes two symmetrically arranged columns 1, a cross beam 2, and two groups of linear motors 3. The top of the column 1 is provided with an "L"-shaped step portion 11 towards the inside. The cross beam 2 is slidably arranged on the step portion 11 of the column 1 through a first guide rail assembly 4 and a second guide rail assembly 5. The first guide rail assembly 4 is horizontally arranged between the bottom of the cross beam 2 and the horizontal plane of the step portion 11, and the second guide rail assembly 5 and the linear motor 3 are both vertically arranged between the side surface of the cross beam 2 and the vertical surface of the step portion 11.

[0020] The present utility model changes the horizontally arranged linear motor 3 to a vertically arranged one and cooperates with the horizontally and vertically arranged guide rail assemblies, so that the magnetic attractions of the primary components of the linear motors 3 on both sides of the cross beam 2 cancel each other out, and the magnetic attraction of the secondary components of the linear motor 3 is borne by the column 1, so that the guide rail assembly no longer bears the magnetic attraction, thereby reducing the load of the guide rail assembly and improving the service life of the guide rail assembly. In addition, since the position of the linear guide rail rises from the bottom of the cross beam 2 to the middle of the cross beam 2, the distance from the center of gravity of the cross beam 2 is shortened, and the overturning moment during driving is reduced; and the overturning moment is borne by the second guide rail assembly 5 vertically arranged above, so that the cross beam 2 no longer has the tendency of pitching forward or backward during acceleration and deceleration. Furthermore, through the setting of the step portion 11, the length of the cross beam 2 is shortened and the weight is reduced, which is beneficial to lightweight and high speed.

[0021] To ensure the smoothness and stability of the displacement of the cross beam 2, the horizontal heights of the two first guide rail assemblies 4 on the two columns 1 are the same; similarly, the horizontal heights of the two second guide rail assemblies 5 on the two columns 1 are the same; the horizontal heights of the two linear motors 3 on the two columns 1 are the same.

[0022] To enable the second guide rail assembly 5 to bear the overturning moment generated by the acceleration and deceleration of the cross beam 2, the second guide rail assembly 5 is located above the linear motor 3.

[0023] Furthermore, the second guide rail assembly 5 is located at the top of the inner side surface of the step portion 11.

[0024] Furthermore, the first guide rail assembly 4 includes a guide rail and a slide table. The guide rail is installed on the horizontal plane of the step portion 11 of the column 1, and the slide table is installed at the bottom of the cross beam 2. Similarly, the second guide rail assembly 5 includes a guide rail and a slide table. The guide rail is installed on the vertical surface of the step portion 11 of the column 1, and the slide table is installed on the side surface of the cross beam 2.

[0025] In an embodiment of the present utility model, the primary component of the linear motor 3 is connected to the cross beam 2, and the secondary component of the linear motor 3 is connected to the column 1.

[0026] To further reduce the tipping moment, the center of the linear motor 3 and the center of gravity of the cross beam 2 are at the same horizontal height.

[0027] In an embodiment of the present utility model, a transverse slide 6 is slidably arranged on the cross beam 2, a longitudinal slide 7 capable of lifting is arranged on the transverse slide 6, a self-locking chuck is arranged at the lower part of the longitudinal slide 7, and a processing tool is arranged in the self-locking chuck. By arranging the transverse slide 6 and the longitudinal slide 7, the processing tool on the cross beam 2 can be translated or lifted to adjust the processing position, which is more convenient and has a wider application range.

[0028] The present utility model changes the horizontally arranged linear motor to a vertically arranged one and cooperates with the horizontally and vertically arranged guide rail assemblies, so that the magnetic attraction forces of the primary components of the linear motor cancel each other out, and the magnetic attraction force of the secondary component of the linear motor is borne by the column, so that the guide rail assemblies no longer bear the magnetic attraction force, thereby reducing the load of the guide rail assemblies and increasing the service life. In addition, since the position of the linear guide rail rises from the bottom of the cross beam to the middle of the cross beam, the distance from the center of gravity of the cross beam is shortened, the tipping moment during driving is reduced, and the tipping moment is borne by the second vertically arranged guide rail assembly above, so that the cross beam no longer has the tendency of pitching forward or backward during acceleration and deceleration. Moreover, with the same span, the length of the cross beam is shortened by the arrangement of the stepped portion, the weight of the cross beam is reduced, which is beneficial to lightweight and high speed. Therefore, the present utility model effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0029] Among them, the terms such as "upper", "lower", "left", "right", "front", "rear", "middle" and "one" cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope of implementation of the present utility model.

[0030] The above embodiments are only illustrative of the principles and effects of the present utility model and are not used to limit the present utility model. All equivalent modifications or changes completed by those with ordinary knowledge in the technical field to which the present utility model belongs without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A crane-type gantry machining center for counteracting magnetic attraction, characterized in that: It includes two symmetrically arranged columns, a beam and two groups of linear motors, the top of the column is provided with an "L"-shaped step portion facing inward, the beam is slidably arranged on the step portion of the column through a first guide rail assembly and a second guide rail assembly, the first guide rail assembly is horizontally arranged between the bottom of the beam and the horizontal surface of the step portion, the second guide rail assembly and the linear motor are both vertically arranged between the side surface of the beam and the vertical surface of the step portion; the two first guide rail assemblies / two second guide rail assemblies / two linear motors located on the two columns have the same horizontal height; the second guide rail assembly is located above the linear motor, and the second guide rail assembly is located at the top of the inner side surface of the step portion.

2. The overhead travelling gantry machining center for counteracting magnetic attraction according to claim 1, characterized in that: The first guide rail assembly / the second guide rail assembly comprises a guide rail and a slide, wherein the guide rail is installed on a column, and the slide is installed on a crossbeam.

3. The overhead travelling gantry machining center for counteracting magnetic attraction according to claim 1, characterized in that: The primary part of the linear motor is connected to the crossbeam, and the secondary part of the linear motor is connected to the column.

4. The overhead travelling gantry machining center for counteracting magnetic attraction according to claim 1, characterized in that: The center of the linear motor and the center of gravity of the crossbeam are located at the same horizontal height.

5. A crane-type gantry machining center for counteracting magnetic attraction according to any one of claims 1 to 4, characterized in that: A transverse slide is slidably arranged on the crossbeam, a longitudinal slide which can be raised and lowered is arranged on the transverse slide, a self-locking chuck is arranged at the lower part of the longitudinal slide, and a processing tool is arranged in the self-locking chuck.

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