A gantry machining center

Abstract

The present invention belongs to the technical field of machining centers, and in particular to a gantry machining center. The following scheme is proposed, which specifically includes a base, beam-type mounting seats are installed on both sides of the base, and a gate-type column is fixedly installed on the top of the beam-type mounting seat, a transverse transmission mechanism is installed on the top of the gate-type column, and a four-track support mechanism is installed on the side of the transverse transmission mechanism, and a U-shaped mounting groove is installed at the front end of the four-track support mechanism. In the present invention, the linear rail head is installed on the main linear rail and the secondary linear rail respectively by means of the main slider group and the secondary slider group, forming a holding structure on the outer side of the linear rail head, and then using the supporting surfaces of the main linear rail and the secondary linear rail to disperse the lateral force, effectively dispersing the lateral pulling force on the main linear rail and the secondary linear rail caused by the vibration generated by the machining center during operation, reducing the lateral wear between the linear rail and the slider, reducing the risk of linear rail deformation, and thus avoiding affecting the accuracy of the machining center.

Description

Technical Field

[0001] The invention relates to the technical field of machining centers, and in particular to a gantry machining center. Background Art

[0002] The gantry machining center is a machine tool widely used in industrial manufacturing. Its advantages are high precision, high efficiency, high reliability and other remarkable features. The axis of the Z axis of the gantry machining center is set vertically to the workbench. The overall structure is a large-scale machining center with a double column and a top beam forming a portal structure frame, and there is a crossbeam in the middle of the double column. It is especially suitable for processing large workpieces and workpieces with complex shapes.

[0003] The spindle box is one of the core parts of the machine tool, which is equipped with the spindle, gearbox and other parts for processing. The operating status of the spindle box is directly related to the working accuracy and efficiency of the entire machine tool. At present, the spindle box of the gantry machining center is mainly limited by full rails or two linear rails. The guide rails need to withstand the vibration of the head during processing. The full rails or two linear rails have poor tolerance for lateral displacement during vibration. Long-term vibration and wear can easily cause lateral deformation of the guide rails, which increases the horizontal vibration amplitude when the head processes parts, affecting the machining accuracy of the machining center.

[0004] In view of this, the present invention provides a gantry machining center to solve the technical problems existing in the above-mentioned prior art. Summary of the invention

[0005] Based on the technical problems existing in the background technology, the present invention proposes a gantry machining center.

[0006] A gantry machining center proposed in the present invention comprises a base, beam-type mounting seats are installed at both sides of the base, and a gate-type column is fixedly installed on the top of the beam-type mounting seat, a transverse transmission mechanism is installed on the top of the gate-type column, a four-track support plate mechanism is installed on the side of the transverse transmission mechanism, and a U-shaped mounting groove is installed at the front end of the four-track support plate mechanism, a linear rail machine head is installed inside the mounting groove, a machining spindle is installed inside the linear rail machine head, two main linear rails arranged in parallel are distributed at the side of the linear rail machine head, and two secondary linear rails are distributed at both ends of the linear rail machine head, two rows of main slide blocks slidably matched with the main linear rails are installed at the middle position of the interior of the mounting groove, secondary slide blocks slidably matched with the two secondary linear rails are respectively installed at the two sides of the interior of the mounting groove, and a heightening pad is installed between the gate-type column and the beam-type mounting seat.

[0007] Preferably in the present invention, guard plates are installed at both ends of the base, and a plurality of adjustment frames are installed at the bottom edge positions of the base and the beam-type mounting seat.

[0008] Preferably in the present invention, a propulsion guide rail is installed inside the base, and a workbench is slidably installed on the top of the propulsion guide rail. A propulsion motor and a propulsion threaded screw for driving the workbench to move are also installed inside the base.

[0009] Preferably in the present invention, the transverse transmission mechanism includes a slanted back support beam arranged at the top of the door-type column, and a transmission screw and a screw motor installed on the side of the slanted back support beam, transverse guide rails are installed on the top and bottom of the side of the slanted back support beam, and a transverse electronic ruler is installed above the side of the slanted back support beam.

[0010] Preferably in the present invention, the four-track pallet mechanism includes a pallet bracket, and a machine head adjustment motor is installed on the top of the pallet bracket, and a vertical threaded screw located inside the mounting groove is installed at the bottom of the output shaft of the machine head adjustment motor, two transverse slider groups slidingly matched with the transverse guide rails are installed on the side of the four-track pallet mechanism away from the mounting groove, a transverse transmission member threadably matched with the transmission screw is installed in the middle of the side of the four-track pallet mechanism away from the mounting groove, and an electronic ruler sensor slidingly matched with the transverse electronic ruler is also installed on the side of the four-track pallet mechanism away from the mounting groove.

[0011] Preferably in the present invention, the four-rail support mechanism is provided with two counterweight cylinders at the outer ends of the mounting grooves, and a balance frame connected to the linear rail machine head is installed between the tops of the two counterweight cylinders.

[0012] Preferably in the present invention, a plurality of buffer grooves distributed at equal distances are arranged inside the sliding cavity of the main slider group and the auxiliary slider group, and damping parts are installed inside the buffer grooves, through lubrication grooves are arranged between the buffer grooves, and a plurality of oil film holes are arranged on the outer surfaces of the main linear rail and the auxiliary linear rail.

[0013] Preferably in the present invention, the middle parts of the main slider group and the auxiliary slider group are both screwed with oil injection bolts, the top of the oil injection bolts are provided with a sealing end, and an elliptical adjustment portion is provided on the outer side of a section of the oil injection bolt located on the side of the damping member, and a penetration groove is provided on the outer side of the adjustment portion.

[0014] Preferably in the present invention, the linear rail machine head includes a machine head bracket, and a vertical transmission member cooperating with a vertical threaded screw transmission is installed on one side of the machine head bracket close to the mounting groove, and the main linear rail and the secondary linear rail are installed in an L-shape on the outside of the machine head bracket.

[0015] Preferably in the present invention, the machining spindle includes an assembly groove arranged on the side of the head bracket away from the mounting groove, and a spindle motor is installed on the top of the assembly groove, and a spindle head extending to the bottom of the linear rail head is installed at the output end of the spindle motor.

[0016] Compared with the prior art, the present invention provides a gantry machining center, which has the following beneficial effects:

[0017] In the present invention, the side of the four-rail support mechanism is provided with two main rails close to the horizontal transmission mechanism and two auxiliary rails located at the side positions through the installation groove of the U-shaped structure. The rail head is respectively installed on the main rail and the auxiliary rail by relying on the main slider group and the auxiliary slider group, forming a holding structure for the outer side of the rail head, and then using the supporting surfaces of the main rail and the auxiliary rail to disperse the lateral force, and when the rail head moves up and down, the oil film holes on the outer surfaces of the main rail and the auxiliary rail are coated with lubricating grease, and the damping member is closely attached to the outer surfaces of the main rail and the auxiliary rail, and a plurality of cavities filled with lubricating grease are formed between the damping member and the outer surfaces of the main rail and the auxiliary rail, and when the rail head vibrates in the left and right directions, the lubricating grease in the cavity is squeezed, and the contraction movement of the lubricating grease is used to Buffering protection is carried out, and the impact force caused by vibration is eliminated through the reciprocating contraction of lubricating grease, thereby further improving the horizontal stability of the linear rail head during operation and improving the machining accuracy of the machining center. Secondly, during the production process, by rotating the oiling bolt, the adjustment part of the elliptical structure squeezes the inner side of the damping element, and adjusts the contact pressure between the damping element and the surface of the main linear rail and the secondary linear rail to compensate for the surface wear of the damping element, thereby improving the sealing effect between the damping element and the oil film holes on the surface of the main linear rail and the secondary linear rail, and enhancing the vibration-mitigating effect of the lubricating oil film. Then, through the four-track setting around the linear rail head, the lateral pulling force of the main linear rail and the secondary linear rail caused by the vibration generated by the machining center during work is effectively dispersed, the lateral wear between the linear rail and the slider is reduced, and the risk of linear rail deformation is reduced, thereby avoiding affecting the accuracy of the machining center. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main structure of a gantry machining center proposed by the present invention;

[0019] Figure 2 A schematic diagram of the side structure of a gantry machining center proposed by the present invention;

[0020] Figure 3 This is a schematic diagram of the position relationship structure of the door-shaped column and the heightening pad of a gantry machining center proposed by the present invention;

[0021] Figure 4 A schematic diagram of the base structure of a gantry machining center proposed by the present invention;

[0022] Figure 5 A schematic diagram of the structure of a transverse transmission mechanism of a gantry machining center proposed by the present invention;

[0023] Figure 6 This is a schematic diagram of the back structure of a four-track support mechanism of a gantry machining center proposed by the present invention;

[0024] Figure 7 This is a schematic diagram of the front structure of a four-track support mechanism of a gantry machining center proposed by the present invention;

[0025] Figure 8 This is a schematic diagram of the back structure of a linear rail machine head of a gantry machining center proposed by the present invention;

[0026] Fig. 9 This is a schematic diagram of the front structure of a linear rail head of a gantry machining center proposed by the present invention;

[0027] Fig.10 A schematic diagram of the distribution structure of the counterweight cylinder of a gantry machining center proposed by the present invention;

[0028] Fig.11 This is a structural schematic diagram of a main slide group and a secondary slide group of a gantry machining center proposed by the present invention;

[0029] Fig.12 The present invention provides a schematic cross-sectional structural diagram of a main slide block and a secondary slide block of a gantry machining center.

[0030] In the figure: 1 base, 2 push guide rail, 3 workbench, 4 processing spindle, 41 spindle motor, 42 assembly groove, 43 spindle head, 5 linear rail head, 51 head bracket, 52 vertical transmission member, 53 main linear rail, 54 secondary linear rail, 6 four-track support plate mechanism, 61 support plate bracket, 62 transverse transmission member, 63 transverse slider group, 64 electronic ruler sensor, 65 counterweight cylinder, 66 head adjustment motor, 67 balance frame, 68 main slider group, 69 secondary slider group, 610 damping member, 611 buffer groove, 612 sealing end, 613 oil injection bolt, 614 penetration groove, 615 adjustment part, 7 transverse transmission mechanism, 71 oblique back support beam, 72 transverse electronic ruler, 73 transverse guide rail, 74 screw motor, 75 transmission screw, 8 door-type column, 9 guard plate, 10 push motor, 11 beam mounting seat, 12 adjustment frame, 13 heightening pad. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0032] Reference Figure 1-12A gantry machining center comprises a base 1, beam-type mounting seats 11 are installed on both sides of the base 1, and a gate-type column 8 is fixedly installed on the top of the beam-type mounting seat 11, a transverse transmission mechanism 7 is installed on the top of the gate-type column 8, a four-track support plate mechanism 6 is installed on the side of the transverse transmission mechanism 7, and a U-shaped mounting groove is installed at the front end of the four-track support plate mechanism 6, a linear rail head 5 is installed inside the mounting groove, a machining spindle 4 is installed inside the linear rail head 5, two parallel main linear rails 53 are distributed on the side of the linear rail head 5, and two secondary linear rails 54 are distributed at both ends of the linear rail head 5, two rows of main slider groups 68 slidingly matched with the main linear rails 53 are installed in the middle position of the inner part of the mounting groove, and secondary slider groups 69 slidingly matched with the two secondary linear rails 54 are respectively installed on both sides of the inner part of the mounting groove, a heightening pad 13 is installed between the gate-type column 8 and the beam-type mounting seat 11, and the heightening pad 13 is adjusted by increasing or decreasing the number of the heightening pads 13 to adjust the height between the gate-type column 8 and the base 1.

[0033] In the present invention, the side of the four-track support mechanism 6 is provided with two main linear rails 53 close to the horizontal transmission mechanism 7 and two auxiliary linear rails 54 located at the side through the installation groove of the U-shaped structure. The linear rail head 5 is respectively installed on the main linear rail 53 and the auxiliary linear rail 54 by means of the main slider group 68 and the auxiliary slider group 69, so as to form a holding structure for the outer side of the linear rail head 5, and then the supporting surface of the main linear rail 53 and the auxiliary linear rail 54 is used to disperse the lateral force, effectively disperse the lateral pulling force of the main linear rail 53 and the auxiliary linear rail 54 caused by the vibration generated by the machining center during operation, reduce the lateral wear between the linear rail and the slider, reduce the risk of linear rail deformation, and thus avoid affecting the accuracy of the machining center.

[0034] As a further solution of the present invention, guard plates 9 are installed at both ends of the base 1, and a plurality of adjustment frames 12 are installed at the bottom edges of the base 1 and the beam-type mounting seat 11.

[0035] As a further solution of the present invention, a propulsion guide rail 2 is installed inside the base 1, and a workbench 3 is slidably installed on the top of the propulsion guide rail 2. A propulsion motor 10 and a propulsion threaded screw for driving the workbench 3 to move are also installed inside the base 1. The workbench 3 relies on the propulsion motor 10 and the propulsion threaded screw to achieve free movement in the X-axis direction.

[0036] Reference Figure 5A gantry machining center, a transverse transmission mechanism 7 includes an oblique back support beam 71 arranged on the top of a door-shaped column 8, and a transmission screw 75 and a screw motor 74 installed on the side of the oblique back support beam 71, and transverse guide rails 73 are installed on the top and bottom of the side of the oblique back support beam 71, and a transverse electronic ruler 72 is installed above the side of the oblique back support beam 71. In the present invention, the linear rail head 5 and the four-rail support plate mechanism 6 rely on the transmission screw 75 and the screw motor 74 to achieve Y-axis movement and adjustment, and through two transverse guide rails 73 distributed on the top and side directions of the oblique back support beam 71, the load on the transverse guide rail 73 in a single direction when the linear rail head 5 is in operation is reduced, and the stability of the linear rail head 5 and the four-rail support plate mechanism 6 during operation is enhanced.

[0037] Reference Figure 6 , Figure 7 and Fig.10 A gantry machining center, a four-track support mechanism 6 includes a support bracket 61, and a head adjustment motor 66 is installed on the top of the support bracket 61, and a vertical threaded screw located inside the mounting groove is installed at the bottom of the output shaft of the head adjustment motor 66. Two transverse slider groups 63 that slide with the transverse guide rail 73 are installed on the side of the four-track support mechanism 6 away from the mounting groove, and a transverse transmission member 62 that threads with the transmission screw 75 is installed in the middle of the side of the four-track support mechanism 6 away from the mounting groove. An electronic ruler sensor 64 that slides with the transverse electronic ruler 72 is also installed on the side of the four-track support mechanism 6 away from the mounting groove. In the present invention, the four-track support mechanism 6 relies on two rows of transverse slider groups 63 distributed in an L shape to slide with the two transverse guide rails 73, and realizes movement adjustment in the Y-axis direction through the transverse transmission member 62 and the transmission screw 75 threadedly cooperate.

[0038] As a further solution in the present invention, two counterweight cylinders 65 are installed at the outer end of the mounting groove of the four-rail support mechanism 6, and a balance frame 67 connected to the linear rail machine head 5 is installed between the tops of the two counterweight cylinders 65. In the present invention, compressed air is introduced into the interior of the counterweight cylinder 65. When the linear rail machine head 5 enters the processing position, the counterweight cylinder 65 provides effective support to the positions on both sides of the linear rail machine head 5, thereby enhancing the stability of the linear rail machine head 5 during the processing process.

[0039] Reference Figure 6 , Figure 7 , Fig.10 , Fig.11 and Fig.12A gantry machining center, a main slide group 68, a sub-slide group 69 slide cavity is provided with a plurality of buffer grooves 611 distributed at equal distances, and a damping member 610 is installed inside the buffer groove 611, a through lubrication groove is provided between the buffer grooves 611, and a plurality of oil film holes are provided on the outer surfaces of the main linear rail 53 and the sub-linear rail 54. In the present invention, lubricating grease is injected into the lubricating groove so that the lubricating grease penetrates to the outer side of the buffer groove 611. When the linear rail head 5 moves up and down, the oil film holes on the outer surfaces of the main linear rail 53 and the sub-linear rail 54 are fully coated with lubricating grease, and the damping member 610 is in close contact with the outer surfaces of the main linear rail 53 and the secondary linear rail 54, and a plurality of cavities filled with grease are formed between the damping member 610 and the outer surfaces of the main linear rail 53 and the secondary linear rail 54. When the linear rail head 5 vibrates in the left and right directions, the grease in the cavity is squeezed, and the contraction movement of the grease is utilized to provide buffer protection for the main linear rail 53, the secondary linear rail 54 and the main slider group 68 and the secondary slider group 69. The reciprocating contraction of the grease eliminates the impact force generated by the vibration, thereby further improving the horizontal stability of the linear rail head 5 during operation and improving the machining accuracy of the machining center.

[0040] As a further solution in the present invention, the middle parts of the main slider group 68 and the auxiliary slider group 69 are both screwed with oil filling bolts 613, and the top of the oil filling bolts 613 is provided with a sealing end 612, and the outer side of the oil filling bolts 613 located on the side of the damping member 610 is provided with an elliptical adjustment portion 615, and the outer side of the adjustment portion 615 is provided with a penetration groove 614. The lubricating grease penetrates into the surface of the damping member 610 through the penetration groove 614 on the surface of the adjustment portion 615 to form a lubricating oil film. During the production process, by rotating the oil filling bolts 613, the elliptical adjustment portion 615 squeezes the inner side of the damping member 610, adjusts the contact pressure between the damping member 610 and the surfaces of the main linear rail 53 and the auxiliary linear rail 54, compensates for the surface wear of the damping member 610, and then improves the sealing effect between the damping member 610 and the oil film holes on the surfaces of the main linear rail 53 and the auxiliary linear rail 54, and enhances the vibration relief effect of the lubricating oil film.

[0041] Reference Figure 8 and Fig. 9 A gantry machining center, a linear rail head 5 includes a head bracket 51, a vertical transmission member 52 matched with a vertical threaded screw transmission is installed on the side of the head bracket 51 close to the mounting groove, and the main linear rail 53 and the secondary linear rail 54 are installed in an L shape on the outside of the head bracket 51. In the present invention, the linear rail head 5 realizes the propulsion movement in the Z-axis direction through the head adjustment motor 66 and the vertical threaded screw.

[0042] As a further solution in the present invention, the machining spindle 4 includes an assembly groove 42 arranged on the side of the head bracket 51 away from the mounting groove, and a spindle motor 41 is installed on the top of the assembly groove 42, and a spindle head 43 extending to the bottom of the linear rail head 5 is installed at the output end of the spindle motor 41.

[0043] When in use, the linear rail machine head 5 is installed on the main linear rail 53 and the secondary linear rail 54 respectively by means of the main slider group 68 and the secondary slider group 69, so as to form a holding structure for the outer side of the linear rail machine head 5, and then use the supporting surfaces of the main linear rail 53 and the secondary linear rail 54 to disperse the lateral force, effectively disperse the lateral pulling force on the main linear rail 53 and the secondary linear rail 54 caused by the vibration generated by the machining center during work, and when the linear rail machine head 5 moves up and down, the oil film holes on the outer surfaces of the main linear rail 53 and the secondary linear rail 54 are coated with lubricating grease, and the damping member 610 is closely attached to the outer surfaces of the main linear rail 53 and the secondary linear rail 54, so as to form a plurality of cavities filled with lubricating grease between the damping member 610 and the outer surfaces of the main linear rail 53 and the secondary linear rail 54, and when the linear rail machine head 5 vibrates in the left and right directions, the lubricating grease in the cavity is squeezed out, and the lubricating grease is used to The contraction movement of the lubricating grease provides buffer protection for the main linear rail 53, the secondary linear rail 54 and the main slider group 68, the secondary slider group 69, and the reciprocating contraction of the lubricating grease eliminates the impact force generated by the vibration. Secondly, during the production process, by rotating the oil filling bolt 613, the adjustment portion 615 of the elliptical structure squeezes the inner side of the damping member 610, and adjusts the contact pressure between the damping member 610 and the surface of the main linear rail 53 and the secondary linear rail 54 to compensate for the surface wear of the damping member 610, thereby improving the sealing effect between the damping member 610 and the oil film holes on the surface of the main linear rail 53 and the secondary linear rail 54. Furthermore, through the four-track setting around the linear rail head 5, the lateral wear between the linear rail and the slider is reduced, and the risk of linear rail deformation is reduced, thereby avoiding affecting the accuracy of the machining center.

[0044] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A gantry machining center, comprising a base (1), beam-type mounting seats (11) being installed at both sides of the base (1), and a gate-type column (8) being fixedly installed on the top of the beam-type mounting seat (11), characterized in that: A transverse transmission mechanism (7) is installed on the top of the door-shaped column (8), a four-track support mechanism (6) is installed on the side of the transverse transmission mechanism (7), and a U-shaped mounting groove is installed at the front end of the four-track support mechanism (6), a linear rail machine head (5) is installed inside the mounting groove, a processing spindle (4) is installed inside the linear rail machine head (5), two parallel main linear rails (53) are distributed on the side of the linear rail machine head (5), and two secondary linear rails (54) are distributed at both ends of the linear rail machine head (5), two rows of main slide blocks (68) slidably matched with the main linear rails (53) are installed in the middle of the mounting groove, and secondary slide blocks (69) slidably matched with the two secondary linear rails (54) are respectively installed on both sides of the mounting groove, and a heightening pad (13) is installed between the door-shaped column (8) and the beam-type mounting seat (11); A plurality of buffer grooves (611) distributed at equal distances are arranged inside the sliding cavity of the main slider group (68) and the auxiliary slider group (69), and a damping member (610) is installed inside the buffer groove (611). A through lubrication groove is arranged between the buffer grooves (611). The outer surfaces of the main linear rail (53) and the auxiliary linear rail (54) are provided with a plurality of oil film holes. An oil injection bolt (613) is screwed in the middle of the main slider group (68) and the auxiliary slider group (69), and a sealing end (612) is arranged at the top of the oil injection bolt (613). An elliptical adjustment portion (615) is arranged on the outer side of a section of the oil injection bolt (613) located on the side of the damping member (610), and a penetration groove (614) is arranged on the outer side of the adjustment portion (615).

2. A gantry machining center according to claim 1, characterized in that: Guard plates (9) are installed at both ends of the base (1), and a plurality of adjustment frames (12) are installed at the bottom edges of the base (1) and the beam-type mounting seat (11).

3. A gantry machining center according to claim 1, characterized in that: A propulsion guide rail (2) is installed inside the base (1), and a workbench (3) is slidably installed on the top of the propulsion guide rail (2). A propulsion motor (10) and a propulsion threaded screw for driving the workbench (3) to move are also installed inside the base (1).

4. A gantry machining center according to claim 1, characterized in that: The transverse transmission mechanism (7) comprises an inclined back support beam (71) arranged at the top of the door-shaped column (8), and a transmission screw (75) and a screw motor (74) installed on the side of the inclined back support beam (71), the top and the bottom of the side of the inclined back support beam (71) are both installed with transverse guide rails (73), and a transverse electronic ruler (72) is installed above the side of the inclined back support beam (71).

5. A gantry machining center according to claim 4, characterized in that: The four-track support mechanism (6) comprises a support bracket (61), and a head adjustment motor (66) is installed on the top of the support bracket (61), and a vertical threaded lead screw located inside the installation groove is installed at the bottom of the output shaft of the head adjustment motor (66); two transverse slider groups (63) slidably matched with the transverse guide rail (73) are installed on the side of the four-track support mechanism (6) away from the installation groove; a transverse transmission member (62) threadedly matched with the transmission lead screw (75) is installed in the middle of the side of the four-track support mechanism (6) away from the installation groove; and an electronic ruler sensor (64) slidably matched with the transverse electronic ruler (72) is also installed on the side of the four-track support mechanism (6) away from the installation groove.

6. A gantry machining center according to claim 5, characterized in that: The four-rail support plate mechanism (6) is provided with two counterweight cylinders (65) at the outer ends of the mounting grooves, and a balancing frame (67) connected to the linear rail machine head (5) is installed between the tops of the two counterweight cylinders (65).

7. A gantry machining center according to claim 1, characterized in that: The linear rail machine head (5) comprises a machine head bracket (51), a vertical transmission member (52) matched with a vertical threaded screw drive is installed on one side of the machine head bracket (51) close to the installation slot, and a main linear rail (53) and a secondary linear rail (54) are installed in an L-shape on the outside of the machine head bracket (51).

8. A gantry machining center according to claim 7, characterized in that: The machining spindle (4) comprises an assembly groove (42) arranged on a side of the head bracket (51) away from the installation groove, and a spindle motor (41) is installed on the top of the assembly groove (42), and a spindle head (43) extending to the bottom of the linear rail head (5) is installed at the output end of the spindle motor (41).

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