Numerical control machining center anti-collision safety device

Abstract

The utility model discloses a numerical control machining center anti -collision safety device, including base, the movable installation of workstation is equipped on the base, and one side of workstation is equipped with the fixing frame, and the headstock of liftable is installed on the fixing frame, and the main shaft and the drive motor of drive main shaft rotation are equipped on the headstock, and the anti -collision device is equipped with on both sides of headstock, two anti -collision devices all include fixed base, and the movable slot is equipped on the fixed base, and the through -hole that communicates with movable slot is equipped in the bottom of fixed base, and the cover is installed at the top of movable slot, and the pressure sensor is fixedly installed at the bottom of cover, and the pressure sensor is electrically connected with external control device, and the bottom of movable slot is equipped with the limit plate, and the spring is arranged between limit plate and pressure sensor, and the movable rod that extends downward through the through -hole is equipped at the bottom of limit plate, and the bottom of movable rod is located below the bottom of processing tool, the utility model effectively prevents the problem of the collision of tool and workpiece, clamp or workstation when Z -axis tool setting fails.

Description

Technical Field

[0001] This utility model relates to the field of CNC machining center technology, specifically a collision avoidance safety device for CNC machining centers. Background Technology

[0002] A CNC machining center is a high-efficiency automated machine tool composed of mechanical equipment and a CNC system, suitable for machining complex parts. It is one of the world's most produced and widely used CNC machine tools. It boasts strong comprehensive machining capabilities, allowing for a greater amount of machining in a single workpiece setup with high precision. For batches of workpieces with moderate machining difficulty, its efficiency is 5 to 10 times that of ordinary equipment. In particular, it can perform many machining operations that ordinary equipment cannot, making it especially suitable for single-piece machining or small-batch, multi-variety production with complex shapes and high precision requirements. It integrates milling, boring, drilling, tapping, and thread cutting functions into a single machine, enabling it to perform multiple machining processes.

[0003] However, if the zero point setting of the working coordinate system is incorrect when performing Z-axis tool setting in existing machining centers before machining, the actual position of the tool during machining will not match the programmed position. This may cause unexpected collisions between the tool and the workpiece, fixture, or worktable, resulting in tool damage, workpiece scrap, or even equipment failure. Utility Model Content

[0004] The purpose of this invention is to provide a collision avoidance safety device for CNC machining centers to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A collision avoidance safety device for a CNC machining center includes a base, a worktable movably mounted on the base, a fixed frame on one side of the worktable, a liftable headstock mounted on the fixed frame, a spindle and a drive motor for driving the spindle to rotate on the headstock, and anti-collision devices symmetrically arranged on both sides of the headstock.

[0007] Both of the aforementioned anti-collision devices include a fixed base with a movable groove. The bottom of the fixed base has a through hole communicating with the movable groove. A cover is installed on the top of the movable groove, and a pressure sensor is fixedly installed on the bottom of the cover. The pressure sensor is electrically connected to an external control device. A limiting plate is provided at the bottom of the movable groove, and a spring is provided between the limiting plate and the pressure sensor. A movable rod extending downward through the through hole is provided at the bottom of the limiting plate, and the bottom of the movable rod is located below the bottom of the machining tool.

[0008] Furthermore, both of the movable rods are provided with hemispherical grooves at their bottoms, and ball bearings are movably disposed within the hemispherical grooves. The bottom of each movable rod is threadedly connected to a limiting sleeve, which is provided with a limiting hole for the ball bearings to pass through. The diameter of the limiting hole is smaller than the diameter of the ball bearings.

[0009] Furthermore, the side shape of the limiting hole matches the surface curvature of the ball.

[0010] Furthermore, the cover is provided with a wire hole for the cable of the pressure sensor to extend out.

[0011] Furthermore, the limiting plate and the movable rod are provided with a communicating limiting groove, the bottom of the pressure sensor abuts against the movable plate, the top of the spring abuts against the bottom of the movable plate, and the bottom center of the movable plate is provided with a limiting rod that can be movably inserted into the limiting groove.

[0012] The beneficial effects of this utility model are:

[0013] This invention presets a pressure threshold and pressure change rate range on an external control device. Initially, the spring is in a pre-compressed state, maintaining the movable rod at its lowest position. The pressure sensor detects the preset initial pressure value. When the headstock lowers along with the spindle, machining tool, and anti-collision device for machining, the bottom of the movable rod is located below the bottom of the machining tool. Before the tool contacts the workpiece, the movable rod first contacts the machine tool's worktable surface. Upon contact with the worktable, the movable rod is obstructed and cannot continue descending. As the headstock continues to descend, the movable rod moves upward relative to the fixed seat, causing the limit plate to move upward. The limit plate compresses the spring located on it, and the force generated by the spring compression... The pressure is directly applied to the pressure sensor, which senses the pressure change in real time and converts the pressure value (or the rate of pressure change) into a corresponding electrical signal. The electrical signal generated by the pressure sensor is transmitted to the external control system in real time via cable. If the control system continuously monitors and receives a pressure value that is less than or equal to a preset threshold and the rate of pressure change is within a preset normal range, the system determines that the contact is normal and safe. If the control system continuously monitors and receives a pressure value that is greater than the preset threshold or the rate of pressure change exceeds the preset normal range, the system immediately determines that there is a risk of collision and immediately triggers an emergency stop to stop the headstock from moving downward, thereby avoiding rigid collisions between the tool and the workpiece, fixture, or worktable and improving the service life of the equipment.

[0014] Other features and advantages of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0015] Figure 1 : Overall structural diagram of this utility model.

[0016] Figure 2 : A cross-sectional view of this utility model.

[0017] Figure 3 : Figure 2 Enlarged view of the structure of part A.

[0018] Figure 4 : Figure 2 Enlarged view of the structure of part B.

[0019] Figure 5 : Figure 2 Enlarged view of the structure of part C.

[0020] Reference numerals: 1. Base; 2. Worktable; 3. Fixing frame; 4. Headstock; 5. Anti-collision device; 41. Spindle; 42. Drive motor; 51. Fixing seat; 52. Movable groove; 53. Through hole; 54. Cover; 55. Pressure sensor; 56. Limiting plate; 57. Spring; 58. Movable rod; 59. Movable plate; 541. Threading hole; 581. Hemispherical groove; 582. Ball bearing; 583. Limiting sleeve; 584. Limiting hole; 585. Limiting groove; 591. Limiting rod. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0022] Please refer to Figure 1-5 ;

[0023] A collision avoidance safety device for a CNC machining center includes a base 1, on which a worktable 2 is movably mounted. The worktable 2 is used to mount a workpiece fixture, which clamps the workpiece to be processed to ensure the stability of the workpiece during processing. A fixed frame 3 is provided on one side of the worktable 2, and a liftable headstock 4 is mounted on the fixed frame 3. Preferably, the installation method of the worktable 2 and the headstock 4 can refer to the installation method of the work platform and the tool holder described in the existing patent document "CN222932331U, A Vertical Machining Center", which will not be repeated here. The headstock 4 is provided with a spindle 41 and a drive motor 42 for driving the spindle 41 to rotate. A machining tool is mounted on the bottom of the spindle 41 through a tool holder. The drive motor 42 drives the spindle 41 to rotate, and the spindle 41 drives the tool holder and the machining tool to rotate synchronously, thereby realizing the cutting of the workpiece. Anti-collision devices 5 are symmetrically provided on both sides of the headstock 4.

[0024] Both anti-collision devices 5 include a fixed base 51, a movable groove 52 on the fixed base 51, a through hole 53 communicating with the bottom of the movable groove 52, a cover 54 on the top of the movable groove 52, a pressure sensor 55 fixedly installed at the bottom of the cover 54, the pressure sensor 55 is electrically connected to an external control device (not shown in the figure) for real-time monitoring of pressure changes acting on the pressure sensor 55, a limiting plate 56 at the bottom of the movable groove 52, a spring 57 between the limiting plate 56 and the pressure sensor 55, the spring 57 serves as a buffer and reset function, and a movable rod 58 extending downward through the through hole 53 at the bottom of the limiting plate 56, the bottom of the movable rod 58 being located below the bottom of the machining tool.

[0025] Working principle: The external control device presets the pressure threshold and pressure change rate range. Initially, spring 57 is in a pre-compressed state, maintaining the movable rod 58 at its lowest position. Pressure sensor 55 detects the preset initial pressure value. When the headstock 4 lowers together with the spindle 41, machining tool, and anti-collision device 5 for machining, since the bottom of the movable rod 58 is below the bottom of the machining tool, it will first contact the surface of the machine tool's worktable 2 before the tool contacts the workpiece. The movable rod 58 is blocked after contacting the worktable 2 and cannot continue to descend. As the headstock 4 continues to descend, the movable rod 58 moves upward relative to the fixed seat 51. The movable rod 58 drives the limiting plate 56 upward, compressing the spring 57 located on it. The force generated by the compression of the spring 57 directly... The pressure sensor 55 senses the pressure change in real time and converts the pressure value (or pressure change rate) into a corresponding electrical signal. The electrical signal generated by the pressure sensor 55 is transmitted to the external control system in real time via cable. If the control system continuously monitors and receives a pressure value that is less than or equal to a preset threshold and the pressure change rate is within the preset normal range, the system determines that the contact is normal and safe. If the control system continuously monitors and receives a pressure value that is greater than the preset threshold or the pressure change rate exceeds the preset normal range, the system immediately determines that there is a risk of collision and immediately triggers an emergency stop to stop the headstock 4 from moving downward, thereby avoiding rigid collisions between the tool and the workpiece, fixture, or worktable 2 and improving the service life of the equipment.

[0026] In this embodiment, both movable rods 58 have hemispherical grooves 581 at their bottoms, and ball bearings 582 are movably disposed within the hemispherical grooves 581. A limiting sleeve 583 is threadedly connected to the bottom of each movable rod 58, and the limiting sleeve 583 has a limiting hole 584 through which the ball bearings 582 pass. The ball bearings 582 can rotate flexibly within the hemispherical grooves 581 and simultaneously contact the surface of the worktable 2. When the worktable 2 moves horizontally, the ball bearings 582 roll along its surface, achieving relative sliding between the movable rods 58 and the worktable 2, thus preventing wear caused by friction. The diameter of the limiting hole 584 is smaller than the diameter of the ball bearings 582 to prevent the ball bearings 582 from falling out. Furthermore, the side shape of the limiting hole 584 matches the surface curvature of the ball bearings 582, ensuring that the ball bearings 582 can still rotate flexibly and smoothly while being constrained.

[0027] In this embodiment, the cover 54 is provided with a wire hole 541 for the cable of the pressure sensor 55 to extend and be electrically connected to an external control device.

[0028] In this embodiment, the limiting plate 56 and the movable rod 58 are provided with a connecting limiting groove 585. The bottom of the pressure sensor 55 abuts against the movable plate 59, and the top of the spring 57 abuts against the bottom of the movable plate 59 to achieve a more uniform pressure transmission. The bottom center of the movable plate 59 is provided with a limiting rod 591 that can be inserted into the limiting groove 585 to ensure that the movable rod 58 always moves in a vertical straight line when it moves up and down, and to prevent deviation or jamming.

[0029] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A collision avoidance safety device for a CNC machining center, comprising a base (1), a worktable (2) movably mounted on the base (1), a fixed frame (3) provided on one side of the worktable (2), a liftable headstock (4) mounted on the fixed frame (3), a spindle (41) and a drive motor (42) for driving the spindle (41) to rotate on the headstock (4), characterized in that, The headstock (4) is symmetrically equipped with anti-collision devices (5) on both sides; Both of the aforementioned anti-collision devices (5) include a fixed base (51), the fixed base (51) is provided with a movable groove (52), the bottom of the fixed base (51) is provided with a through hole (53) communicating with the movable groove (52), the top of the movable groove (52) is provided with a cover (54), the bottom of the cover (54) is fixedly installed with a pressure sensor (55), the pressure sensor (55) is electrically connected to an external control device, the bottom of the movable groove (52) is provided with a limiting plate (56), a spring (57) is provided between the limiting plate (56) and the pressure sensor (55), the bottom of the limiting plate (56) is provided with a movable rod (58) extending downward through the through hole (53), and the bottom of the movable rod (58) is located below the bottom of the machining tool.

2. The anti-collision safety device for a CNC machining center according to claim 1, characterized in that, Both of the movable rods (58) have a hemispherical groove (581) at their bottom. A ball (582) is movably disposed in the hemispherical groove (581). The bottom of the movable rod (58) is threadedly connected to a limiting sleeve (583). The limiting sleeve (583) has a limiting hole (584) for the ball (582) to pass through. The diameter of the limiting hole (584) is smaller than the diameter of the ball (582).

3. The anti-collision safety device for a CNC machining center according to claim 2, characterized in that, The side shape of the limiting hole (584) matches the surface curvature of the ball (582).

4. The anti-collision safety device for a CNC machining center according to claim 1, characterized in that, The cover (54) is provided with a wire hole (541) for the cable of the pressure sensor (55) to extend out.

5. The anti-collision safety device for a CNC machining center according to claim 1, characterized in that, The limiting plate (56) and the movable rod (58) are provided with a connecting limiting groove (585). The bottom of the pressure sensor (55) abuts against the movable plate (59). The top of the spring (57) abuts against the bottom of the movable plate (59). The bottom center of the movable plate (59) is provided with a limiting rod (591) that can be inserted into the limiting groove (585).

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