Centrifugal counterweight type coal mine motor machining anti-vibration tooling

Abstract

This invention discloses a centrifugal counterweight-type vibration damping fixture for coal mine motor machining, comprising a centrifugal support device. The centrifugal support device includes a support rib, the lower end of which is a connecting ring. The connecting ring is fixed to the end face of the spindle by bolts, and a support rod is fixed to the connecting ring. A shaft hole is provided on the upper part of the support rod, and the upper end of a swing arm is fixed to a gripper. The swing arm and the support rod are connected by a rotating shaft located in the shaft hole. A through hole is provided on the lower outer side of the swing arm, and a counterweight is fixed to the lower outer side of the swing arm by bolts and nuts passing through the through hole. The gripper matches the upper outer contour of the workpiece and abuts against the upper outer side of the workpiece, while the cutting tool processes the inner side of the workpiece. The advantages of this invention are: dynamic adaptive vibration damping: the centrifugal force generated by the counterweight as the spindle speed increases can actively counteract vibration; the higher the speed, the stronger the vibration damping force, perfectly adapting to the dynamic vibration requirements of high-speed machining scenarios.

Description

Technical Field

[0001] This invention relates to the field of machinery, specifically to a support fixture for machining thin-walled workpieces. Background Technology

[0002] High-speed machining of thin-walled parts for coal mine motors presents challenges due to insufficient workpiece strength. Furthermore, the thin walls of the workpieces are prone to vibration during machining, which intensifies with rotational speed, leading to poor surface finish and blade chipping. Current technologies typically employ fixtures containing liquid plastic to address these issues. However, these fixtures are complex, costly, and lack adaptability. Moreover, existing fixtures cannot adjust clamping strength in real-time to accommodate varying vibrations at different rotational speeds, thus limiting their application. Summary of the Invention

[0003] To address the aforementioned problems, this invention aims to provide an active tooling that can dynamically adjust the anti-vibration force according to the rotational speed and is adapted to the processing environment of coal mine motors, thereby achieving stable control of the processing process.

[0004] The specific technical solution of the invention is: a centrifugal counterweight anti-vibration fixture for coal mine motor machining, including a chuck fixed to the spindle, the chuck clamping the lower outer side of the workpiece, and a centrifugal support device, the centrifugal support device including a support rib, the lower end of the support rib being a connecting ring, the connecting ring being fixed to the end face of the spindle by bolts, and a support rod being fixed on the connecting ring; a shaft hole is provided on the upper part of the support rod, the upper end of the swing arm is fixed to the gripper, and the swing arm and the support rod are connected by a rotating shaft provided in the shaft hole; a through hole is provided on the lower outer side of the swing arm, and a counterweight is fixed to the lower outer side of the swing arm by bolts and nuts passing through the through hole; the gripper matches the upper outer contour of the workpiece and abuts against the upper outer side of the workpiece, and the cutting tool processes the inner side of the workpiece.

[0005] The upper end of the swing arm is equipped with a lead screw motor, the output end of the lead screw motor is connected to the lead screw, and the lead screw is connected to the lead screw nut hole of the slide block; the slide block is set on the slide rail of the swing arm; a counterweight is set on the slide block.

[0006] The rotating shaft is equipped with a speed sensor, which is connected to the control center. The control center controls the rotation of the lead screw motor through the motor actuator based on the speed information collected by the speed sensor.

[0007] Bearings are installed at both ends of the lead screw.

[0008] The grippers consist of three claws, which are evenly distributed around the circumference of the workpiece.

[0009] The counterweight is circular.

[0010] The advantages of this invention are: dynamic adaptive vibration damping: the centrifugal force generated by the counterweight as the spindle speed increases can actively counteract vibration. The higher the speed, the stronger the vibration damping force, perfectly adapting to the dynamic vibration requirements of high-speed machining scenarios.

[0011] Improved machining quality: Effectively suppresses machining vibration, significantly improves the surface finish and precision of thin-walled parts for coal mine motors, and solves the problem of difficult surface quality control.

[0012] Extend tool life: Reduce the impact of vibration on the cutting tool, reduce the probability of chipping, increase tool life, and reduce machining costs. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is the front view of the present invention;

[0015] Figure 3 This is a schematic diagram of the adjustment structure of the counterweight;

[0016] In the diagram, 1 is the counterweight, 2 is the tool holder, 3 is the tool post, 4 is the centrifugal support device, 41 is the gripper, 42 is the swing arm, 421 is the lead screw motor, 422 is the lead screw, 423 is the slide, 424 is the slide rail, 425 is the bearing, 43 is the support rod, 44 is the connecting ring, 5 is the bolt and nut, 6 is the bolt, 8 is the chuck, 9 is the main spindle, 10 is the rotating shaft, and 20 is the workpiece. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] As shown in the figure, the present invention includes a chuck 8 fixed to the spindle, which clamps the lower outer side of the workpiece 20. It also includes a centrifugal support device 4, which includes a support rib. The lower end of the support rib is a connecting ring 44, which is fixed to the end face of the spindle 9 by bolts 6. A support rod 43 is fixed on the connecting ring. The upper part of the support rod 43 is provided with a shaft hole. The upper end of the swing rod 42 is fixed to the jaw 41. The swing rod 42 and the support rod 43 are axially connected by a rotating shaft 10 provided in the shaft hole. The lower outer side of the swing rod 42 is provided with a through hole. The counterweight 1 is fixed to the lower outer side of the swing rod by bolts and nuts 5 passing through the through hole. The jaw 41 matches the upper outer contour of the workpiece 20 and abuts against the upper outer side of the workpiece. The cutting tool processes the inner side of the workpiece.

[0019] To ensure that the clamping force can be adjusted according to the processing requirements and specific conditions of different workpieces, a lead screw motor 421 is provided at the upper end of the swing arm 42, the output end of the lead screw motor is connected to the lead screw 422, and the lead screw is connected to the lead screw nut hole of the slide block 423; the slide block is provided on the slide rail 424 of the swing arm; a counterweight 1 is provided on the slide block.

[0020] The rotating shaft is equipped with a speed sensor, which is connected to the control center. The control center controls the rotation of the lead screw motor through the motor actuator based on the speed information collected by the speed sensor.

[0021] To ensure low operating resistance and stability of the lead screw, bearings 425 are installed at both ends of the lead screw.

[0022] The grippers consist of three claws, which are evenly distributed around the circumference of the workpiece.

[0023] The counterweight is circular.

[0024] The method of using this invention is as follows:

[0025] Tooling installation: Fix the thin-walled workpiece 20 to be processed in the coal mine motor to the spindle with the through jaw 8, install the tool on the tool holder 3, and firmly connect the tooling of the present invention to the turning spindle 9. At the same time, check the integrity of the explosion-proof sealing structure.

[0026] Machining Start: Start the machining spindle, and the speed sensor starts to collect speed data in real time. When the speed reaches the set threshold (e.g., 5000r / min), the centrifugal counterweight assembly drives the counterweight block (1) to start swinging outward, generating centrifugal force to counteract the vibration of the parts.

[0027] Dynamic adjustment: During the machining process, the speed sensing adjustment mechanism adjusts the position of the counterweight 1 according to the real-time changes in the speed of the turning spindle 9, so that the magnitude of the centrifugal force changes accordingly to adapt to the changing requirements of the workpiece bearing force.

Claims

1. A centrifugal counterweight type anti-vibration fixture for machining coal mine motors, comprising a chuck fixed to the spindle, the chuck clamping the lower outer side of the workpiece, characterized in that: It also includes a centrifugal support device, which includes a support rib, the lower end of which is a connecting ring. The connecting ring is fixed to the end face of the spindle by bolts, and a support rod is fixed on the connecting ring. A shaft hole is provided on the upper part of the support rod, and the upper end of the swing arm is fixed to the gripper. The swing arm and the support rod are connected by a rotating shaft provided in the shaft hole. A through hole is provided on the lower outer side of the swing arm, and a counterweight is fixed to the lower outer side of the swing arm by bolts and nuts passing through the through hole. The gripper matches the upper outer contour of the workpiece and abuts against the upper outer side of the workpiece, and the cutting tool processes the inner side of the workpiece.

2. The centrifugal counterweight type anti-vibration fixture for processing coal mine motors according to claim 1, characterized in that: The upper end of the swing arm is equipped with a lead screw motor, the output end of the lead screw motor is connected to the lead screw, and the lead screw is connected to the lead screw nut hole of the slide block; the slide block is set on the slide rail of the swing arm; a counterweight is set on the slide block.

3. The centrifugal counterweight type anti-vibration fixture for processing coal mine motors according to claim 2, characterized in that: The rotating shaft is equipped with a speed sensor, which is connected to the control center. The control center controls the rotation of the lead screw motor through the motor actuator based on the speed information collected by the speed sensor.

4. The centrifugal counterweight type anti-vibration fixture for processing coal mine motors according to claim 2, characterized in that: Bearings are installed at both ends of the lead screw.

5. The centrifugal counterweight type anti-vibration fixture for processing coal mine motors according to claim 1, characterized in that: The grippers consist of three claws, which are evenly distributed around the circumference of the workpiece.

6. The centrifugal counterweight type anti-vibration fixture for processing coal mine motors according to claim 2, characterized in that: The counterweight is circular.

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