Portal frame type double-spindle numerical control machine tool

Abstract

The portal frame type double-spindle numerical control machine tool comprises a movable portal frame and a spindle mechanism, the movable portal frame is a #-shaped frame and comprises two sets of parallel main beams and two sets of parallel movable cross beams arranged at the upper ends of the main beams, and the two sets of movable cross beams are perpendicular to the two sets of main beams; the two main beams are fixedly connected with a machine tool through stand columns and form a workpiece feeding and discharging channel. The movable cross beam is slidably connected to the main beams in the extending direction of the main beams. The two main shaft mechanisms are arranged on the opposite sides of the two movable cross beams through the saddle mechanisms correspondingly. According to the structure, through the design of a double-spindle mechanism, the machining efficiency and the machining precision are greatly improved, and particularly, large and complex parts are machined more flexibly.

Description

Technical Field

[0001] The utility model relates to the technical field of numerical control drilling machines, in particular to a gantry type double-spindle numerical control machine tool. Background Art

[0002] The overall structure of a gantry-type CNC machine tool adopts a gantry-like layout, with the spindle mechanism mounted on the gantry, forming a machining table below the spindle. Existing CNC machine tools mostly use a single-spindle design. However, with increasing demand, the efficiency and precision requirements for machining individual parts are becoming increasingly demanding. This single-spindle mechanism presents numerous limitations, particularly when machining large and complex parts. To improve machining efficiency and precision, and to expand the possibilities for machining large and complex parts, this paper proposes a gantry-type dual-spindle CNC machine tool. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a gantry type dual-spindle CNC machine tool.

[0004] The technical solution of the utility model is as follows: comprising a mobile gantry and a spindle mechanism, wherein the mobile gantry is in the shape of a crisscross frame, comprising two sets of parallel main beams and two sets of mutually parallel movable cross beams arranged at the upper ends of the main beams, wherein the two sets of movable cross beams are perpendicular to the two sets of main beams;

[0005] The two sets of main beams are fixedly connected to the machine tool through columns to form a workpiece loading and unloading channel, and the movable crossbeam is slidably connected to the main beam along the extension direction of the main beam; the two sets of spindle mechanisms are respectively arranged on the opposite sides of the two sets of movable crossbeams through the sliding saddle mechanism.

[0006] Furthermore: the saddle mechanism includes a ram and a saddle connected to the ram in a vertical sliding direction, and the main shaft end of the main shaft mechanism is fixedly connected to the saddle.

[0007] Furthermore: a tool magazine is also provided on the lower end face of the movable crossbeam, and the tool magazine includes a tool magazine plate and a conveying drive assembly that drives the tool magazine plate to move. Multiple groups of tool clamps for receiving and delivering tools are evenly distributed on the end of the tool magazine plate opposite to the spindle mechanism.

[0008] Furthermore: the upper end surface of the main beam is provided with a Y-axis drive mechanism and a guide rail assembly extending in the same direction as the main beam, and the movable beam is slidably connected to the main beam through the guide rail assembly under the driving action of the Y-axis drive mechanism.

[0009] Furthermore: a Z-axis drive mechanism with an output end stroke in the vertical direction is provided on the slide, and the Z-axis drive mechanism is arranged between the slide and the saddle, and guide rail assemblies are provided on both sides of the Z-axis drive mechanism; the saddle is driven by the Z-axis drive mechanism to slide in the vertical direction and is connected to the guide rail assembly.

[0010] Furthermore: two sets of balancing components are provided on opposite sides of the upper part of the slide, and the output ends of the two sets of balancing components are connected to the slide saddle to bear the gravity of the main shaft mechanism in the vertical direction.

[0011] Furthermore: the balancing assembly includes a balancing cylinder and a gas cylinder connected by a pipeline, two sets of balancing bars are symmetrically arranged on opposite sides of the upper part of the slide, and the piston rod output end of the balancing cylinder is connected to the slide saddle.

[0012] Furthermore: the upper end surface of the movable crossbeam and the side surface opposite to the ram are provided with a plurality of guide rail assemblies extending in the same direction as the movable crossbeam, and the ram slides synchronously along the plurality of guide rail assemblies.

[0013] Furthermore: the guide rail assembly at the lower part of the moving crossbeam protrudes toward the sliding saddle mechanism, and the protruding guide rail assembly forms a lever fulcrum of the sliding saddle mechanism on the moving crossbeam.

[0014] The beneficial technical effects of the utility model are as follows: the mobile gantry adopts a tic-tac-toe frame design, which makes the main structure have good rigidity and stability; the two sets of spindle mechanisms are respectively arranged on the two sets of movable beams, and the two sets of spindle mechanisms can operate independently or synchronously, providing greater flexibility for processing, and also making the working efficiency of the spindle mechanism in the workspace higher, and the saddle mechanism can also provide more precise and flexible movement; each spindle mechanism is equipped with a set of tool magazines, and the automatic replacement of tools is completed, the structure is compact, the space occupied is small, and the tool magazine can meet the requirements of different processing procedures. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the sliding saddle mechanism of the utility model;

[0017] Figure 3 This is a schematic diagram of the installation of the tool magazine of the utility model;

[0018] Figure 4 This is a schematic diagram of the bottom structure of the tool magazine of the utility model;

[0019] Among them: 1. Mobile gantry; 11. Main beam; 12. Mobile crossbeam; 13. Column; 2. Spindle mechanism; 21. Spindle end; 3. Saddle mechanism; 31. Slide; 32. Saddle; 4. Y-axis drive mechanism; 5. X-axis drive mechanism; 6. Z-axis drive mechanism; 7. Balance assembly; 71. Balance cylinder; 72. Gas cylinder; 8. Tool magazine; 81. Tool magazine plate; 82. Conveyor drive assembly; 821. Drive cylinder; 83. Tool holder; 84. Tool detector. DETAILED DESCRIPTION

[0020] In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the specific implementation methods of the present invention are further described in detail below in conjunction with the drawings and examples. The following examples are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0021] like Figure 1 As shown, the gantry-type dual-spindle CNC machine tool described in the present invention includes a movable gantry 1 and a spindle mechanism 2 , and the spindle mechanism 2 is arranged on the movable gantry 1 through a sliding saddle mechanism 3 .

[0022] The mobile gantry 1 is arranged in a grid-like configuration and includes two sets of parallel main beams 11 and two sets of parallel movable crossbeams 12 disposed above the main beams 11. The two sets of main beams 11 are fixedly connected to the machine tool via columns 13, and the movable crossbeams 12 are perpendicular to the main beams 11. Two sets of spindle mechanisms 2 are disposed on opposite sides of the two sets of movable crossbeams 12, allowing the machining center within the grid-like configuration to have two sets of spindle mechanisms 2 operating simultaneously.

[0023] The direction along which the main beam 11 extends is defined as the Y-axis, the direction along which the movable crossbeam 12 extends is defined as the X-axis, and the direction perpendicular to the Y-axis and X-axis is defined as the Z-axis. The movable crossbeam 12 is slidably connected to the main beam 11 under the drive of the Y-axis drive mechanism 4. Specifically, the upper end surfaces of both sets of main beams 11 are each provided with a Y-axis drive mechanism 4, and the ends of the movable crossbeam 12 are respectively connected to the drive output terminals of the two sets of Y-axis drive mechanisms 4. In this embodiment, the connection structure between the drive output terminals and the movable crossbeam 12 utilizes a conventional screw drive structure in the art.

[0024] Furthermore, the upper end surface of the main beam 11 is also provided with multiple groups of guide rail assemblies extending in the same direction as the main beam 11. The movable beam 12 is slidably connected to the main beam 11 through the guide rail assemblies. The multiple groups of guide rail assemblies support and guide the movable beam 12, and also ensure that the movable beam 12 moves stably.

[0025] like Figure 2 As shown, the saddle mechanism 3 includes a slide 31 and a slide 32 slidably connected to the slide 31 along the Z axis. The slide 31 is connected to the driving output end of the X-axis driving mechanism 5 provided on the moving beam 12. Under the driving action of the X-axis driving mechanism 6, the saddle mechanism 3 drives the spindle mechanism 2 to slide along the X axis and is connected to the moving beam 12.

[0026] Specifically, the side of the moving beam 12 opposite the ram is provided with multiple sets of guide rail assemblies extending in the same direction as the moving beam 12, and the ram 31 slides synchronously along the multiple sets of guide rail assemblies. The multiple sets of guide rail assemblies make the moving beam 12 more evenly stressed and also help increase the load-bearing capacity of the saddle mechanism 3.

[0027] Furthermore, in order to ensure that the spindle mechanism 2 is more stable during movement, the upper end surface of the moving beam 12 is also provided with a guide rail assembly extending in the same direction as the moving beam 12. The slide 31 is connected to the guide rail assembly through a plate extending toward the moving beam 12. The plate strengthens the connection between the saddle mechanism 3 and the moving beam 12.

[0028] Furthermore, when the spindle mechanism 2 is working, in order to make the upper and lower parts of the saddle mechanism 3 have better load balancing capabilities, the lower guide rail assembly on the side opposite to the sliding beam 12 and the ram protrudes toward the saddle mechanism 3, and the protruding guide rail assembly forms a lever fulcrum of the saddle mechanism 3 on the moving beam 12.

[0029] The slide 31 is also provided with a Z-axis drive mechanism 6 whose output end stroke is along the Z-axis direction. The Z-axis drive mechanism 6 is arranged between the slide 31 and the saddle 32. The slide 31 is provided with a guide rail assembly extending along the Z-axis, and two sets of guide rail assemblies are respectively arranged on both sides of the Z-axis drive mechanism 6; the saddle 32 is connected to the output end of the Z-axis drive mechanism 6 through a screw transmission structure, and the saddle 32 is connected to the guide rail assembly along the Z-axis under the driving action of the Z-axis drive mechanism 6.

[0030] In order to keep the spindle mechanism 2 in a stable working state during operation and to improve the stability and reliability of the system, two sets of balancing components 7 are provided on opposite sides of the upper part of the slide 31. The two sets of balancing components 7 are symmetrically arranged so that the pressure of the two sets of balancing components 7 on the slide 31 is more uniform. The balancing components 7 can apply an upward pulling force to the saddle 32 to bear the gravity of the spindle mechanism 2 moving along the Z-axis direction and reduce the load of the Z-axis drive mechanism 6 along the Z-axis direction.

[0031] The balancing assembly 7 includes a balancing cylinder 71 and a gas cylinder 72. Two sets of balancing bars 71 are symmetrically arranged on opposite sides of the upper portion of the ram 31. Two sets of gas cylinders 72 are respectively arranged on opposite sides of the movable crossbeam 12 and the saddle mechanism 3. The gas cylinders 72 are filled with inert gas. The cylinder body of the balancing cylinder 71 and the gas cylinder 72 are connected by a pipe, and the output end of the piston rod of the balancing cylinder 71 is connected to the saddle 32. Specifically, the saddle 32 will exert a downward pulling force on the piston rod of the balancing cylinder 71 and compress the gas. The increased gas pressure will exert an upward reaction force on the piston rod, thereby generating an upward pulling force on the saddle 32.

[0032] The spindle mechanism 2 adopts a belt transmission spindle box with high rigidity, high torque and small space, including a spindle end 21. The spindle end 21 is fixedly connected to the slide saddle 32 to ensure stability during processing.

[0033] The lower end surface of the movable crossbeam 12 is also provided with a tool magazine 8. Figure 3 and Figure 4The tool magazine 8 is fixed to the lower end surface of the movable crossbeam 12 through a mounting plate. The tool magazine 8 includes a tool magazine plate 81 and a conveying drive assembly 82 that drives the tool magazine plate 81 to move. The conveying drive assembly 82 includes a driving cylinder 821 fixed to the bottom of the mounting plate, and a guide rail assembly arranged on both sides of the driving cylinder 821 and extending along the pneumatic stroke direction of the driving cylinder 821; the tool magazine plate 81 is fixedly connected to the stroke output end of the driving cylinder 821, and is slidably connected to the mounting plate through a guide rail assembly. A plurality of groups of tool clamps 83 for receiving and delivering tools are evenly distributed on the end opposite to the tool magazine plate 81 and the spindle mechanism 2; a broken tool detector 84 is provided under each tool clamp 83, and the broken tool detector 84 is fixedly connected to the mounting plate through a fixed plate, and is used to detect whether the tool is worn or broken.

[0034] By adopting a tic-tac-toe frame structure on the mobile gantry 1, simultaneous processing of two sets of spindle mechanisms 2 is achieved, which has high processing efficiency; each spindle mechanism 2 is equipped with a set of simple tool magazines 8, and completes automatic replacement of tools, with a simple structure, and the tool magazines 8 can also meet the requirements of different processes. When the workpiece is processed in multiple processes, the workpiece is avoided from circulating between the workbenches; and the two sets of spindle mechanisms 2 run synchronously, which is more flexible when processing large and complex parts.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A gantry-type dual-spindle CNC machine tool, comprising a movable gantry (1) and a spindle mechanism (2), characterized in that: The movable gantry (1) is in the shape of a tic-tac-toe frame, comprising two sets of parallel main beams (11) and two sets of mutually parallel movable cross beams (12) arranged at the upper ends of the main beams (11), wherein the two sets of movable cross beams (12) are perpendicular to the two sets of main beams (11); The two sets of main beams (11) are fixedly connected to the machine tool through the columns (13) and form a workpiece loading and unloading channel. The movable crossbeam (12) is slidably connected to the main beam (11) along the extension direction of the main beam (11); and the two sets of main shaft mechanisms (2) are respectively arranged on the opposite sides of the two sets of movable crossbeams (12) through the sliding saddle mechanisms (3).

2. The gantry-type dual-spindle CNC machine tool according to claim 1, characterized in that: The saddle mechanism (3) comprises a ram (31) and a saddle (32) slidably connected to the ram (31) in a vertical direction, and the main shaft end (21) of the main shaft mechanism (2) is fixedly connected to the saddle (32).

3. The gantry-type dual-spindle CNC machine tool according to claim 1, characterized in that: The lower end surface of the movable crossbeam (12) is also provided with a tool magazine (8), and the tool magazine (8) includes a tool magazine plate (81) and a conveying drive assembly (82) for driving the tool magazine plate (81) to move. The end of the tool magazine plate (81) opposite to the spindle mechanism (2) is evenly distributed with multiple groups of tool holders (83) for receiving and delivering tools.

4. The gantry-type dual-spindle CNC machine tool according to claim 1, characterized in that: The upper end surface of the main beam (11) is provided with a Y-axis driving mechanism and a guide rail assembly extending in the same direction as the main beam (11); the movable crossbeam (12) is slidably connected to the main beam (11) through the guide rail assembly under the driving action of the Y-axis driving mechanism.

5. The gantry-type dual-spindle CNC machine tool according to claim 2, characterized in that: A Z-axis driving mechanism (6) with an output end stroke along a vertical direction is provided on the ram (31), the Z-axis driving mechanism (6) being arranged between the ram (31) and the saddle (32), and guide rail assemblies are provided on both sides of the Z-axis driving mechanism (6); the saddle (32) is slidably connected to the guide rail assembly along a vertical direction under the drive of the Z-axis driving mechanism (6).

6. The gantry-type dual-spindle CNC machine tool according to claim 2, characterized in that: Two groups of balancing components (7) are provided on opposite sides of the upper portion of the ram (31), and the output ends of the two groups of balancing components (7) are connected to the saddle (32) to bear the gravity of the spindle mechanism (2) in the vertical direction.

7. The gantry-type dual-spindle CNC machine tool according to claim 6, characterized in that: The balancing assembly (7) includes a balancing cylinder (71) and a gas cylinder (72) connected by a pipeline. Two sets of balancing bars (71) are symmetrically arranged on opposite sides of the upper part of the ram (31). The output end of the piston rod of the balancing cylinder (71) is connected to the saddle (32).

8. The gantry-type dual-spindle CNC machine tool according to claim 2, characterized in that: The upper end surface of the moving crossbeam (12) and the side surface opposite to the ram (31) are provided with a plurality of guide rail assemblies extending in the same direction as the moving crossbeam (12), and the ram (31) slides synchronously along the plurality of guide rail assemblies.

9. The gantry-type dual-spindle CNC machine tool according to claim 8, characterized in that: The guide rail assembly at the bottom of the moving crossbeam (12) protrudes toward the sliding saddle mechanism (3), and the protruding guide rail assembly forms a lever fulcrum of the sliding saddle mechanism (3) on the moving crossbeam (12).

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