Direct connection main shaft assembly body structure for gantry machining center

Abstract

The utility model relates to the technical field of gantry machining centers, and discloses a direct connection main shaft assembly body structure for a gantry machining center, which comprises a sliding saddle and a ram, a vertically distributed main shaft is arranged in the ram, a vertically through U-shaped channel is arranged on the outer end face of the sliding saddle, the ram is arranged in the U-shaped channel and is vertically connected with the sliding saddle in a sliding manner, and the ram is arranged in the U-shaped channel. 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 advantages of being large in structural strength, good in stability and smaller in torque borne by the gantry frame.

Description

Technical Field

[0001] This utility model relates to the field of gantry machining center technology, and in particular to a direct-drive spindle assembly structure for gantry machining centers. Background Technology

[0002] A gantry machining center is a machining center where the spindle's Z-axis is perpendicular to the worktable. Its overall structure consists of a gantry frame formed by two columns and a top beam. The spindle assembly moves horizontally along the slide rails of the gantry frame via a saddle. Gantry machining centers are particularly suitable for machining large and complex-shaped workpieces. In existing gantry machining centers, the motor is typically mounted on the outer end face of the saddle, while the inner end face of the saddle is slidably connected to the gantry frame. A ram is located inside the saddle, and the spindle is housed within the ram. The motor and spindle are driven by a belt. This necessitates an opening at the outer end of the saddle for the belt to pass through and to allow for the ram's movement, which reduces the saddle's strength. Furthermore, due to the motor's significant weight, mounting it on the outer end face of the saddle causes the center of gravity of the entire spindle assembly to deviate further from the gantry frame, resulting in greater torque on the gantry frame and affecting the stability between the saddle and the gantry frame. Utility Model Content

[0003] In order to solve the above-mentioned problems in the prior art, this utility model provides a direct-drive spindle assembly structure for machining centers with a sliding saddle structure that has high strength, good stability, and less torque on the gantry frame.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A direct-drive spindle assembly structure for a gantry machining center includes a saddle and a ram. The ram contains vertically distributed spindles. The outer end face of the saddle has a vertically penetrating U-shaped channel. The ram is disposed within the U-shaped channel and is vertically slidably connected to the saddle. The outer end face of the saddle has a pressure plate for closing the open end of the U-shaped channel. The upper end of the ram is provided with a first motor for driving the spindle to rotate.

[0006] By adopting the above technical solution: the first motor is set at the upper end of the slide block, and a pressure plate is installed at the opening end of the U-shaped channel of the slide block, thereby closing the opening end of the U-shaped channel, increasing the strength of the slide block, and making the slide block move more stably within the slide block; at the same time, it makes the center of gravity of the entire spindle assembly closer to the gantry frame, reducing the torque borne by the gantry frame and improving the overall stability.

[0007] Preferably, the saddle has a lifting mechanism located on the inner side of the ram for driving the ram to rise and fall within the U-shaped channel. The lifting mechanism controls the raising and lowering of the ram.

[0008] Preferably, the lifting mechanism includes a lead screw vertically mounted at the bottom of the U-shaped channel, a second motor connected to the upper end of the lead screw, a threaded sleeve on the lead screw, and a connecting seat on the side of the slide block, with the threaded sleeve and the connecting seat detachably connected. The lifting and lowering of the slide block is precisely controlled by the second motor and the lead screw.

[0009] Preferably, the pressure plate is connected to both sides of the opening end of the U-shaped channel on the slide saddle using fasteners. The pressure plate and the slide saddle are detachably connected, making installation, disassembly, and maintenance more convenient.

[0010] Preferably, a stopper is provided between the pressure plate and the slide block. The inner wall of the stopper slides in contact with the slide block, and the outer wall of the stopper abuts against the inner side of the pressure plate. Limiting seats are provided at both ends of the pressure plate for limiting the ends of the stopper. The stopper is provided between the pressure plate and the slide block to fill the gap between them and to limit the sliding movement of the outer side of the slide block.

[0011] Preferably, the inner wall of the stopper is provided with a main oil groove distributed along the moving direction of the slide block, and several branch oil grooves are provided on the side of the main oil groove. The outer end of the stopper is provided with an oil injection hole communicating with the main oil groove. Oil is injected into the main oil groove and the branch oil grooves through the oil injection hole to maintain oil lubrication between the stopper and the slide block.

[0012] Preferably, the outer surface of the stopper is conical, and the limiting seat is connected to the end of the pressure plate via an adjusting member, forming an adjusting gap between the limiting seat and the end of the pressure plate. The oil injection hole is located within the adjusting gap. With prolonged use of the slide block, wear will occur between the inner surface of the slide block and the stopper. By adjusting the gap using the adjusting member, the conical surface of the stopper allows the inner surface of the stopper to maintain sliding contact with the slide block, thereby ensuring the lifting accuracy of the slide block. Simultaneously, placing the oil injection hole at the adjusting gap facilitates direct oil injection into the main oil groove and the support oil groove without disassembling the machine.

[0013] Preferably, the adjusting element is configured as a bolt, the end of which is threadedly connected to the end of the pressure plate, and a fastening nut is provided on the bolt. Tightening the bolt reduces the adjusting gap, thereby causing the inner surface of the stopper to abut against the surface of the slide block. The bolt is then tightened to prevent loosening.

[0014] Preferably, the upper end of the slide is provided with a motor base, the first motor is mounted on the motor base, the shaft end of the first motor is provided with a drive wheel, the upper end of the main shaft is provided with a transmission shaft, the transmission shaft is provided with a driven wheel, and the drive wheel and the driven wheel are connected by a transmission belt; the main shaft and the transmission shaft are provided with cooling channels inside, and the upper end of the transmission shaft is provided with a rotary joint communicating with the cooling channels. The first motor is connected to the transmission shaft through the drive wheel, transmission shaft, and driven wheel, which allows for the rotary joint to be provided at the upper end of the transmission shaft. Coolant is injected into the cooling channels in the main shaft through the rotary joint to maintain the temperature of the main shaft, thereby effectively improving machining accuracy.

[0015] Therefore, this utility model has the beneficial effects of high strength and good stability of the sliding saddle structure, and less torque on the gantry frame. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0017] Figure 2 for Figure 1 The front view.

[0018] Figure 3 for Figure 2 Sectional view at point AA.

[0019] Figure 4 for Figure 1 The left view.

[0020] Figure 5 for Figure 4 Sectional view at point BB.

[0021] Figure 6 for Figure 1 Exploded view.

[0022] Figure 7 This is a schematic diagram showing the separation state of the pressure plate and the slide saddle.

[0023] Figure 8 This is an exploded view of the ram.

[0024] Figure 9 This is a schematic diagram of the structure of the stopcock.

[0025] Figure 10 This is a schematic diagram showing the connection of the limit seat, stopper, and pressure block.

[0026] Figure 11 This is a schematic diagram showing the connection between the present invention and the gantry frame. Detailed Implementation

[0027] To make the technical problem to be solved, the technical solution, and the beneficial technical effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining the present utility model and are not intended to limit the scope of protection of the present utility model.

[0028] It should be understood that the terms "first," "second," etc., used herein are for descriptive purposes only and should not be construed as indicating or implying relative importance, nor should they be construed as implicitly specifying the number of technical features indicated. Features specified as "first" or "second" may expressly or implicitly indicate that at least one of those features is included.

[0029] like Figures 1-8 The diagram shows a direct-drive spindle assembly structure for a gantry machining center, including a saddle 1 and a ram 2. The ram 2 has vertically distributed spindles 3 inside. The outer end face of the saddle 1 has a vertically penetrating U-shaped channel 10. The ram 2 is located inside the U-shaped channel 10 and is vertically slidably connected to the saddle 1. The outer end face of the saddle 1 has a pressure plate 4 for closing the open end of the U-shaped channel 10. The upper end of the ram 2 has a first motor 5 for driving the spindle 3 to rotate.

[0030] The sliding saddle 1 is provided with a lifting mechanism 6 on the inner side of the sliding bolster 2 for driving the sliding bolster 2 to rise and fall within the U-shaped channel 10. The lifting mechanism 6 includes a lead screw 60 vertically arranged at the bottom of the U-shaped channel 10 and a second motor 61 connected to the upper end of the lead screw 60. The lead screw 60 is provided with a threaded sleeve 62, which is threadedly connected to the lead screw 60. The side of the sliding bolster 2 is provided with a connecting seat 63, and the threaded sleeve 62 and the connecting seat 63 are detachably connected.

[0031] The pressure plate 4 is connected to the two sides of the opening end of the U-shaped channel 10 on the slide saddle 1 by fasteners. In this embodiment, the fasteners are configured as bolts, and the pressure plate and the slide saddle are bolted together, making installation, disassembly and maintenance more convenient.

[0032] A stopper 7 is provided between the pressure plate 4 and the slide ram 2. The inner wall of the stopper 7 is in sliding contact with the slide ram 2, and the outer wall of the stopper 7 abuts against the inner side of the pressure plate 4. The two ends of the pressure plate 4 are provided with limiting seats 8 for limiting the end of the stopper 7. The inner wall of the stopper 7 is provided with a main oil groove 70 distributed along the moving direction of the slide ram 2. The side of the main oil groove 70 is provided with several branch oil grooves 71. The outer side end of the stopper 7 is provided with an oil injection hole 72 that communicates with the main oil groove 70.

[0033] like Figure 9 and Figure 10As shown, the outer surface of the stopper 7 is configured as a conical surface 700. The limiting seat 8 is connected to the end of the pressure plate 4 through the adjusting member 81. An adjusting gap 800 is formed between the limiting seat 8 and the end of the pressure plate 4. The oil injection hole 72 is located within 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 4. A fastening nut 811 is provided on the bolt 810.

[0034] The upper end of the slide ram 2 is provided with a motor base 20, the first motor 5 is mounted on the motor base 20, the shaft end of the first motor 5 is provided with a drive wheel 50, the upper end of the main shaft 3 is provided with a transmission shaft 9, the transmission shaft 9 is provided with a driven wheel 90, and the drive wheel 50 and the driven wheel 90 are connected by a transmission belt 51; the main shaft 3 and the transmission shaft 9 are provided with a cooling channel 300 inside, and the upper end of the transmission shaft 9 is provided with a rotary joint 91 that communicates with the cooling channel 300.

[0035] Referring to the accompanying drawings, the principle of this utility model is as follows: Figure 11 As shown, the slide saddle 1 is installed on the gantry frame 11 of the gantry machining center. The slide ram is completely enclosed in four directions inside the slide saddle. The outer end of the slide saddle is connected by a pressure plate to increase the strength of the slide saddle and increase the sliding stability of the slide ram inside the slide saddle. Since the first motor is installed on the upper end of the slide ram, the distance between the center of gravity of the entire spindle assembly and the gantry frame is smaller, so the torque on the gantry frame is smaller, further improving the stability of the entire machine tool.

[0036] In the description of this utility model, it should be understood that the directions or positional relationships indicated by up, down, left, right, inner end, outer end, one end, and the other end are based on the orientation or positional relationships shown in the accompanying drawings. They are only for the purpose of more clearly describing the technical solution of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and should not be construed as a limitation of this utility model.

[0037] Although specific embodiments of the present invention are described in detail herein, they are given for illustrative purposes only and should not be construed as limiting the scope of the present invention. Various substitutions, alterations, and modifications may be conceived without departing from the spirit and scope of the present invention.

Claims

1. A direct-drive spindle assembly structure for a gantry machining center, comprising a saddle (1) and a ram (2), wherein a vertically distributed spindle (3) is provided inside the ram (2), and a vertically penetrating U-shaped channel (10) is provided on the outer end face of the saddle (1), and the ram (2) is disposed within the U-shaped channel (10) and vertically slidably connected to the saddle (1), characterized in that, The outer end face of the slide saddle (1) is provided with a pressure plate (4) for closing the opening end of the U-shaped channel (10), and the upper end of the slide ram (2) is provided with a first motor (5) for driving the main shaft (3) to rotate.

2. The direct-drive spindle assembly structure for a gantry machining center according to claim 1, characterized in that, The saddle (1) is provided with a lifting mechanism (6) on the inner side of the bolster (2) for driving the bolster (2) to rise and fall in the U-shaped channel (10).

3. The direct-drive spindle assembly structure for a gantry machining center according to claim 2, characterized in that, The lifting mechanism (6) includes a lead screw (60) vertically arranged at the bottom of the U-shaped channel (10) and a second motor (61) connected to the upper end of the lead screw (60). The lead screw (60) is provided with a threaded sleeve (62), which is threadedly connected to the lead screw (60). The side of the slide block (2) is provided with a connecting seat (63), and the threaded sleeve (62) and the connecting seat (63) are detachably connected.

4. The direct-drive spindle assembly structure for a gantry machining center according to claim 1, characterized in that, The pressure plate (4) is connected to the two sides of the opening end of the U-shaped channel (10) on the slide saddle (1) by fasteners.

5. A direct-drive spindle assembly structure for a gantry machining center according to claim 1 or 4, characterized in that, A stopper (7) is provided between the pressure plate (4) and the slide (2). The inner wall of the stopper (7) slides in contact with the slide (2), and the outer wall of the stopper (7) abuts against the inner side of the pressure plate (4). The two ends of the pressure plate (4) are provided with limiting seats (8) for limiting the end of the stopper (7).

6. The direct-drive spindle assembly structure for a gantry machining center according to claim 5, characterized in that, The inner wall of the stop iron (7) is provided with a main oil groove (70) distributed along the moving direction of the slide (2), and the side of the main oil groove (70) is provided with a number of branch oil grooves (71). The outer side end of the stop iron (7) is provided with an oil injection hole (72) communicating with the main oil groove (70).

7. The direct-drive spindle assembly structure for a gantry machining center according to claim 6, characterized in that, The outer surface of the stopper (7) is configured as a conical surface (700). The limiting seat (8) is connected to the end of the pressure plate (4) through the adjusting member (81). An adjusting gap (800) is formed between the end of the limiting seat (8) and the end of the pressure plate (4). The oil injection hole (72) is located within the adjusting gap (800).

8. The direct-drive spindle assembly structure for a gantry machining center according to claim 7, characterized in that, The adjusting member (81) is configured as a bolt (810), the end of which is threadedly connected to the end of the pressure plate (4), and a fastening nut (811) is provided on the bolt (810).

9. The direct-drive spindle assembly structure for a gantry machining center according to claim 1, characterized in that, The upper end of the slide (2) is provided with a motor base (20), the first motor (5) is mounted on the motor base (20), the shaft end of the first motor (5) is provided with a drive wheel (50), the upper end of the main shaft (3) is provided with a transmission shaft (9), the transmission shaft (9) is provided with a driven wheel (90), the drive wheel (50) and the driven wheel (90) are connected by a transmission belt (51); the main shaft (3) and the transmission shaft (9) are provided with a cooling channel (300), and the upper end of the transmission shaft (9) is provided with a rotary joint (91) communicating with the cooling channel (300).

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