Direct connection main shaft assembly body structure for gantry machining center

Abstract

The invention relates to the technical field of gantry machining centers, and discloses a gantry machining center structure which comprises a machine tool base and a gantry frame with the two ends connected with the machine tool base, a workbench capable of feeding in the X direction is arranged on the machine tool base, and a main shaft assembly capable of feeding in the Y direction is arranged on one side of the gantry frame. The sliding saddle is connected with the gantry frame in a sliding mode, the ram ascends and descends in the sliding saddle in the Z direction, spindles distributed in the Z direction are arranged in the ram, a vertically-through U-shaped channel is formed in the outer end face of the sliding saddle, and the ram is arranged in the U-shaped channel and is connected with the sliding saddle in the Z direction in a sliding mode. A pressing plate used for sealing the open end of the U-shaped channel is arranged on the outer end face of the sliding saddle, and a first motor used for driving the main shaft to rotate is arranged at the upper end of the ram. The sliding saddle has the beneficial effects that the sliding saddle is high in structural strength and good in stability, and the torque borne by the gantry frame is smaller.

Description

Technical Field

[0001] The invention relates to the technical field of gantry machining centers, and in particular to a direct-connected spindle assembly structure for a gantry machining center. Background Art

[0002] A gantry machining center refers to a machining center in which the spindle Z axis is vertically arranged with the worktable. The overall structure is a gantry frame composed of double columns and a top beam. The spindle assembly moves horizontally on the slide rail of the gantry frame through a saddle. The gantry machining center is particularly suitable for processing large workpieces and workpieces with complex shapes. In the spindle assembly of an existing gantry machining center, the motor is usually installed on the outer end face of the saddle, the inner end face of the saddle is slidably connected with the gantry frame, a ram is arranged in the saddle, the spindle is arranged in the ram, and the motor and the spindle are driven by a belt. This requires an opening at the outer end of the saddle for the belt to pass through and to avoid the lifting of the ram, which leads to a decrease in the strength of the saddle; at the same time, due to the large weight of the motor, the motor is installed on the outer end face of the saddle, which causes the center of gravity of the entire spindle assembly to deviate from the gantry frame by a greater distance, resulting in the gantry frame being subjected to a greater torque, which in turn affects the stability between the saddle and the gantry frame. Summary of the invention

[0003] In order to solve the above problems existing in the prior art, the present invention provides a direct-connected spindle assembly structure for a machining center, which has a saddle structure with high strength, good stability and a gantry frame subjected to less torque.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: A gantry machining center structure comprises a machine tool base and a gantry frame connected to the machine tool base at both ends, the machine tool base is provided with a workbench that can be fed along the X direction, a spindle assembly that can be fed along the Y direction is provided on one side of the gantry frame, the spindle assembly comprises a saddle slidably connected to the gantry frame, a ram that rises and falls along the Z direction in the saddle, a spindle distributed in the Z direction is provided in the ram, a vertically penetrating U-shaped channel is provided on the outer end surface of the saddle, the ram is arranged in the U-shaped channel and slidably connected to the saddle in the Z direction, a pressure plate for closing the open end of the U-shaped channel is provided on the outer end surface of the saddle, and a first motor for driving the spindle to rotate is provided at the upper end of the ram.

[0005] By adopting the above technical solution: the first motor is arranged at the upper end of the slide, and a pressure plate is installed at the open end of the U-shaped channel of the saddle, so that the open end of the U-shaped channel is closed, the strength of the saddle is increased, and the movement of the slide in the saddle is more stable; at the same time, the center of gravity of the entire spindle assembly is brought closer to the gantry frame, the torque borne by the gantry frame is reduced, and the overall stability is improved.

[0006] Preferably, a lifting mechanism for driving the ram to rise and fall in the U-shaped channel is provided on the saddle at the inner side of the ram. The lifting mechanism is used to control the rise and fall of the ram.

[0007] Preferably, the lifting mechanism comprises a screw rod vertically arranged at the bottom of the U-shaped channel, a second motor connected to the upper end of the screw rod, a thread sleeve is provided on the screw rod, the thread sleeve is threadedly connected to the screw rod, a connecting seat is provided on the side of the ram, and the thread sleeve is detachably connected to the connecting seat. The lifting and lowering of the ram is precisely controlled by the second motor and the screw rod.

[0008] Preferably, the pressing plate is connected to both sides of the opening end of the U-shaped channel on the slide saddle by fasteners. The pressing plate and the slide saddle are detachably connected, and installation, disassembly and maintenance are more convenient.

[0009] Preferably, a plug is provided between the pressure plate and the ram, the inner wall of the plug is in sliding contact with the ram, the outer wall of the plug is in contact with the inner side of the pressure plate, and both ends of the pressure plate are provided with a limit seat for limiting the end of the plug. The plug is provided between the pressure plate and the ram to fill the gap between the two, and the outer side of the ram is slidably limited.

[0010] Preferably, the inner wall of the stopper is provided with a main oil groove distributed along the moving direction of the ram, the side of the main oil groove is provided with a plurality of branch oil grooves, and the outer side end of the stopper is provided with an oil filling hole connected to the main oil groove. The oil filling hole fills oil into the main oil groove and the branch oil groove to maintain the oil lubrication between the stopper and the ram.

[0011] Preferably, the outer side surface of the plug is configured as a conical surface, the limit seat is connected to the end of the pressure plate through an adjusting member, an adjustment gap is formed between the limit seat and the end of the pressure plate, and the oil filling hole is located in the adjustment gap. With the long-term use of the ram, wear will occur between the ram and the inner side surface of the plug. The adjustment gap is adjusted by adjusting the adjusting member, and the conical surface of the plug is used to make the inner side surface of the plug maintain sliding contact with the ram, thereby ensuring the lifting accuracy of the ram; at the same time, the oil filling hole is set at the adjustment gap, which is convenient for directly filling oil into the main oil tank and the branch oil tank without disassembling the machine.

[0012] Preferably, the adjusting member is configured as a bolt, the end of the bolt is threadedly connected to the end of the pressure plate, and a tightening nut is provided on the bolt. The adjustment gap is reduced by tightening the bolt, so that the inner side of the plug is in contact with the surface of the ram, and then the bolt is tightened by the bolt to prevent the bolt from loosening.

[0013] Preferably, a motor seat is provided at the upper end of the ram, the first motor is arranged on the motor seat, a driving wheel is provided at the shaft end of the first motor, a transmission shaft is provided at the upper end of the main shaft, a driven wheel is provided on the transmission shaft, and the driving wheel and the driven wheel are connected by a transmission belt; cooling channels are provided inside the main shaft and the transmission shaft, and a rotary joint connected to the cooling channel is provided at the upper end of the transmission shaft. The first motor is connected to the transmission shaft through the driving wheel, the transmission shaft, and the driven wheel, so that a rotary joint can be provided at the upper end of the transmission shaft, and coolant is injected into the cooling channel in the main shaft through the rotary joint to maintain the temperature of the main shaft, thereby effectively improving the processing accuracy.

[0014] Preferably, the sliding surface of the saddle and the gantry frame is used as the reference surface s, the distance from the axis of the spindle to the reference surface s is configured as a, and the distance from the outer side of the pressure plate to the reference surface s is configured as b, wherein the value of a / b is configured as 0.55-0.7. This setting reduces the size from the outer side of the spindle assembly to the gantry frame as much as possible while satisfying the processing stroke of the gantry machine tool, thereby minimizing the torque on the gantry frame.

[0015] Therefore, the present invention has the beneficial effects that the saddle structure has high strength, good stability, and the gantry frame is subjected to less torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A structural schematic diagram of the present invention.

[0017] Figure 2 for Figure 1 Front view of .

[0018] Figure 3 This is a schematic diagram of the structure of the spindle assembly.

[0019] Figure 4 for Figure 3 Front view of .

[0020] Figure 5 for Figure 4 Section view at AA in the middle.

[0021] Figure 6 for Figure 3 Left view of .

[0022] Figure 7 for Figure 6 Cross-sectional view at BB in the middle.

[0023] Figure 8 for Figure 3 Exploded diagram.

[0024] Fig. 9 Schematic diagram of the separation state of the pressure plate and the saddle.

[0025] Fig.10 This is an exploded view of the ram.

[0026] Fig.11 This is a schematic diagram of the structure of the Serbian iron.

[0027] Fig.12 This is a connection diagram of the limit seat, plug and pressure block. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the scope of protection of the present invention.

[0029] It should be understood that, in this document, the expressions "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance, nor should they be understood as implicitly indicating the number of technical features indicated. Features defined as "first" or "second" may explicitly or implicitly indicate that at least one of the features is included.

[0030] like Figure 1-Figure 10 A gantry machining center structure shown in the figure includes a machine tool base 10, a gantry frame 11 connected to the machine tool base 10 at both ends, a workbench 12 that can be fed along the X direction is provided on the machine tool base 10, a spindle assembly 2 that can be fed along the Y direction is provided on one side of the gantry frame 11, the spindle assembly 2 includes a saddle 21 slidably connected to the gantry frame 11, a ram 222 that can be lifted and lowered along the Z direction in the saddle, a spindle 23 distributed in the Z direction is provided in the ram 222, a vertically penetrating U-shaped channel 210 is provided on the outer end face of the saddle 21, the ram 222 is arranged in the U-shaped channel 210 and is slidably connected to the saddle 21 in the Z direction, a pressure plate 24 for closing the open end of the U-shaped channel 2100 is provided on the outer end face of the saddle 21, and a first motor 25 for driving the spindle 23 to rotate is provided at the upper end of the ram 222.

[0031] A lifting mechanism 6 for driving the ram 22 to rise and fall in the U-shaped channel 210 is provided on the saddle 21 on the inner side of the ram 22. The lifting mechanism 6 includes a screw rod 60 vertically arranged at the bottom of the U-shaped channel 210, and a second motor 61 connected to the upper end of the screw rod 60. A threaded sleeve 62 is provided on the screw rod 60, and the threaded sleeve 62 is threadedly connected to the screw rod 60. A connecting seat 63 is provided on the side of the ram 22, and the threaded sleeve 62 and the connecting seat 63 are detachably connected.

[0032] The pressure plate 24 is connected to both sides of the open end of the U-shaped channel 210 on the slide saddle 21 by fasteners. In this embodiment, the fasteners are configured as bolts. The pressure plate and the slide saddle are bolted to facilitate installation, disassembly and maintenance.

[0033] An iron plug 7 is provided between the pressure plate 24 and the ram 22, the inner wall of the iron plug 7 is in sliding contact with the ram 22, the outer wall of the iron plug 7 is in abutment with the inner side surface of the pressure plate 24, and limit seats 8 are provided at both ends of the pressure plate 24 for limiting the ends of the iron plug 7; a main oil groove 70 distributed along the moving direction of the ram 22 is provided on the inner wall of the iron plug 7, a plurality of branch oil grooves 71 are provided on the side of the main oil groove 70, and an oil filling hole 72 connected to the main oil groove 70 is provided at the end of the outer side surface of the iron plug 7.

[0034] like Fig.11 and Fig.12 As shown, the outer side surface of the plug iron 7 is configured as a conical surface 700, the limit seat 8 is connected to the end of the pressure plate 24 through an adjusting member 81, an adjusting gap 800 is formed between the limit seat 8 and the end of the pressure plate 24, and the oil filling hole 72 is located in the adjusting gap 800; the adjusting member 81 is configured as a bolt 810, the end of the bolt 810 is threadedly connected to the end of the pressure plate 24, and a fastening nut 811 is provided on the bolt 810.

[0035] A motor seat 3 is provided at the upper end of the slide 22, and a first motor 25 is arranged on the motor seat 3. A driving wheel 250 is provided at the shaft end of the first motor 25. A transmission shaft 4 is provided at the upper end of the main shaft 23, and a driven wheel 40 is provided on the transmission shaft 4. The driving wheel 250 and the driven wheel 40 are connected by a transmission belt 41. A cooling channel 230 is provided inside the main shaft 23 and the transmission shaft 4, and a rotating joint 5 connected to the cooling channel 230 is provided at the upper end of the transmission shaft 4.

[0036] As shown in FIG6 , the sliding surface between the saddle 21 and the gantry frame 11 is used as the reference surface s, the distance from the axis of the spindle 23 to the reference surface s is configured as a, and the distance from the outer side surface of the pressure plate 24 to the reference surface s is configured as b, wherein the value of a / b is configured to be 0.55-0.7. In this embodiment, the value of a / b is configured to be 0.6.

[0037] In conjunction with the accompanying drawings, the principles of the present invention are as follows: Fig.11 As shown, the saddle 21 is installed on the gantry frame 11 of the gantry machining center, the slide is completely closed in four directions inside the saddle, and the outer end of the saddle is connected by a pressure plate, which increases the strength of the saddle and increases the sliding stability of the slide inside the saddle; since the first motor is installed at the upper end of the slide, the center of gravity of the entire spindle assembly is closer to the gantry frame, so that the gantry frame is subjected to less torque, further improving the stability of the entire machine tool.

[0038] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by up, down, left, right, inside, outside, one end, the other end, etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the purpose of more clearly describing the technical solution of the present invention, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific orientation, and cannot be understood as a limitation of the present invention.

[0039] Although specific embodiments of the present invention are described in detail herein, they are provided for the purpose of explanation only and should not be considered to limit the scope of the present invention. Various substitutions, changes and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. A gantry machining center structure, comprising a machine tool base (10), a gantry frame (11) connected to the machine tool base (10) at both ends, the machine tool base (10) being provided with a worktable (12) capable of feeding in an X direction, and a spindle assembly (2) capable of feeding in a Y direction being provided on one side of the gantry frame (11), wherein: The spindle assembly (2) comprises a saddle (21) slidably connected to the gantry frame (11), a ram (22) lifted and lowered in the saddle along the Z direction, a spindle (23) distributed in the Z direction is arranged in the ram (22), a vertically penetrating U-shaped channel (210) is arranged on the outer end surface of the saddle (21), the ram (22) is arranged in the U-shaped channel (210) and slidably connected to the saddle (21) in the Z direction, a pressure plate (24) for closing the open end of the U-shaped channel (210) is arranged on the outer end surface of the saddle (21), and a first motor (25) for driving the spindle (23) to rotate is arranged on the upper end of the ram (22).

2. A gantry machining center structure according to claim 1, characterized in that: A lifting mechanism (6) for driving the ram (22) to move up and down in the U-shaped channel (210) is provided on the saddle (21) and located on the inner side of the ram (22).

3. A gantry machining center structure according to claim 2, characterized in that: The lifting mechanism (6) comprises a screw rod (60) vertically arranged at the bottom of the U-shaped channel (210), and a second motor (61) connected to the upper end of the screw rod (60); a thread sleeve (62) is provided on the screw rod (60), and the thread sleeve (62) is threadedly connected to the screw rod (60); a connecting seat (63) is provided on the side of the ram (22), and the thread sleeve (62) and the connecting seat (63) are detachably connected.

4. A gantry machining center structure according to claim 1, characterized in that: The pressing plate (24) is connected to both sides of the opening end of the U-shaped channel (210) on the sliding saddle (21) via fasteners.

5. A structure for a gantry machining center according to claim 1 or 4, characterized in that: An iron stopper (7) is provided between the pressure plate (24) and the ram (22); the inner wall of the iron stopper (7) is in sliding contact with the ram (22); the outer wall of the iron stopper (7) is in abutment with the inner side surface of the pressure plate (24); and limiting seats (8) for limiting the ends of the iron stopper (7) are provided at both ends of the pressure plate (24).

6. A gantry machining center structure according to claim 5, characterized in that: The inner wall of the iron plug (7) is provided with a main oil groove (70) distributed along the moving direction of the ram (22), a side of the main oil groove (70) is provided with a plurality of branch oil grooves (71), and an outer side end of the iron plug (7) is provided with an oil injection hole (72) connected to the main oil groove (70).

7. A gantry machining center structure according to claim 6, characterized in that: The outer side surface of the plug iron (7) is configured as a conical surface (700), the limit seat (8) is connected to the end of the pressure plate (24) through an adjustment member (81), an adjustment gap (800) is formed between the limit seat (8) and the end of the pressure plate (24), and the oil injection hole (72) is located in the adjustment gap (800).

8. A gantry machining center structure according to claim 7, characterized in that: The adjusting member (81) is configured as a bolt (810), the end of the bolt (810) is threadedly connected to the end of the pressing plate (24), and a fastening nut (811) is provided on the bolt (810).

9. The gantry machining center structure according to claim 1 is characterized in that: A motor seat (3) is provided at the upper end of the ram (22), the first motor (25) is arranged on the motor seat (3), a driving wheel (250) is provided at the shaft end of the first motor (25), a transmission shaft (4) is provided at the upper end of the main shaft (23), a driven wheel (40) is provided on the transmission shaft (4), and the driving wheel (250) and the driven wheel (40) are connected via a transmission belt (41); cooling channels (230) are provided inside the main shaft (23) and the transmission shaft (4), and a rotary joint (5) connected to the cooling channel (230) is provided at the upper end of the transmission shaft (4).

10. A gantry machining center structure according to claim 1, characterized in that: The sliding surface between the saddle (21) and the gantry frame (11) is used as a reference surface s, the distance from the axis of the main shaft (23) to the reference surface s is configured as a, and the distance from the outer side surface of the pressure plate (24) to the reference surface s is configured as b, wherein the value of a / b is configured to be 0.55-0.7.

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