CN-121988864-A - Rotary feeding device and method for square bar

Abstract

The invention provides a rotary feeding device and a feeding method for square bars, wherein the device comprises a frame, a material ejection cylinder, a main shaft assembly, a bearing seat, a power transmission assembly and a guide assembly, wherein the material ejection cylinder is fixedly arranged on the frame, the main shaft assembly is rotationally connected to the frame and is provided with a feeding channel for accommodating the square bars, the bearing seat is connected to the output end of the material ejection cylinder, one end of the power transmission assembly is rotationally connected to the bearing seat, the other end of the power transmission assembly is connected to the main shaft assembly, the guide assembly comprises a guide rail and a movable seat, the movable seat is fixedly connected to the bearing seat, the movable seat is slidingly connected to the guide rail, and the length direction of the guide rail is parallel to the length direction of the feeding channel. The invention solves the technical problems that the square bar is difficult to realize stable, constant-pressure and long-stroke precise feeding in a high-speed rotation state, and has the advantages of stable feeding, high precision, good reliability and convenient automatic control.

Inventors

• LI HUI
• ZHAO HAITAO
• JIANG LETIAN

Assignees

• 中国航空制造技术研究院

Dates

Publication Date

20260508

Application Date

20260324

Claims (10)

1. 1. A rotary feed device for square bar stock, comprising: A frame; The ejection cylinder is fixedly arranged on the frame; the main shaft assembly is rotatably connected to the frame and is provided with a feeding channel for accommodating square bars; The bearing seat is connected to the output end of the ejection cylinder; one end of the power transmission component is rotationally connected with the bearing seat, and the other end of the power transmission component is connected with the main shaft component; The guide assembly comprises a guide rail and a movable seat, wherein the movable seat is fixedly connected with the bearing seat, the movable seat is slidably connected with the guide rail, and the length direction of the guide rail is parallel to the length direction of the feeding channel.
2. 2. The rotary feeding device for square bars according to claim 1, wherein the power transmission assembly comprises a large ejector rod and a small ejector rod which are sequentially connected, the upper end of the large ejector rod is rotatably connected with the bearing seat through a bearing, and the lower end of the small ejector rod extends into the feeding channel and is abutted against the top end of the square bar.
3. 3. The rotary feeding device for square bars according to claim 2, wherein the top end of the small ejector rod is provided with a threaded section, the bottom end of the large ejector rod is provided with a threaded hole, and the threaded section is in threaded connection with the threaded hole.
4. 4. A billet rotary feed device as in claim 3 wherein the threaded bore is rotated in a direction opposite to the direction of rotation of the spindle assembly.
5. 5. The rotary feeding device for square bar stock according to claim 1, wherein the cross section of the large ejector rod is square, and at least one reinforcing rib is arranged on the periphery of the large ejector rod.
6. 6. The rotary feeding device for square bars according to claim 5, wherein the reinforcing ribs are T-shaped reinforcing ribs, four T-shaped reinforcing ribs are uniformly distributed along the circumferential direction of the large ejector rod.
7. 7. The rotary feeder of claim 6, wherein the feed channel is a profiled bore adapted to the outer contour of the large ejector rod such that the large ejector rod can rotate synchronously with the spindle assembly and slide axially within the profiled bore.
8. 8. The rotary feeding device for square bar stock according to claim 1, further comprising a magnetostrictive displacement sensor mounted inside the ejector cylinder for detecting a stroke state of a piston of the ejector cylinder.
9. 9. A feeding method, characterized in that it is carried out with a rotary feeding device for square bars according to any one of claims 1-8, comprising the steps of: s1, loading square bars into a feeding channel of the main shaft assembly; S2, driving the main shaft assembly to drive the square bar to rotate; S3, starting the ejection cylinder, applying axial ejection force to the rotating square bar through the power transmission assembly, enabling the square bar to be sent out from the tail end of the feeding channel, and enabling the sent square bar to generate heat with a matrix in a friction mode and form a deposition channel in a deposition mode; and S4, after the square bar is consumed, the material ejection cylinder drives the bearing seat and the power transmission assembly to retract to an initial position.
10. 10. The feeding method according to claim 1, wherein after step S4, steps S1 to S4 are repeatedly performed to achieve continuous feeding.

Description

Rotary feeding device and method for square bar Technical Field The invention relates to the technical field of square bar conveying, in particular to a rotary feeding device and a rotary feeding method for square bars. Background In advanced manufacturing processes such as friction additive manufacturing and friction welding, a rod-shaped filling material (consumable material) is continuously fed under a constant pressure in a state of rotating at a high speed, so that friction and heat generation are realized between the rod-shaped filling material and a substrate or a deposited layer, and plastic connection and layer-by-layer accumulation of the material are realized. Square bar stock is increasingly used in such processes because of its advantages in torsion resistance and drive synchronicity. However, existing feeding devices, when applied to constant force feed of rotating square bar stock, face a series of technical challenges: The coupling problem of rotation and jacking movement is that the feeding device needs to reliably transmit jacking power (linear movement) to the square bar rotating at high speed, and meanwhile, the rotation of the main shaft cannot be blocked. The traditional mode that adopts pneumatic or hydraulic chuck centre gripping jacking easily appears skidding, clamping force fluctuation scheduling problem under high-speed rotation, leads to the feeding force unstable, influences the shaping quality. The problem of long-stroke precise feeding is that in order to reduce the downtime of the material changing and improve the production efficiency, the single bar is expected to be as long as possible. However, under a long stroke, how to ensure the structural rigidity and straightness of the ejector rod system when rotating and bearing the axial jacking counter force, and avoid bending or vibration is a great difficulty. Feed state monitoring and closed loop control in order to achieve constant force feed and accurate process control, jacking displacement and pressure need to be monitored accurately in real time, and the rotating environment brings difficulty to sensor installation and signal transmission. The problem of convenience in changing materials is that after the bar materials are consumed, new bar materials need to be quickly and conveniently changed, the existing device is complex in structure, and the changing process is complex. Disclosure of Invention First, the technical problem to be solved The invention aims to solve the technical problem that the square bar is difficult to realize stable, constant-pressure and long-stroke precise feeding in a high-speed rotating state. (II) technical scheme In order to achieve the above purpose, the invention adopts the following technical scheme: The invention provides a rotary feeding device for square bars, which comprises a frame, a material ejection cylinder, a main shaft assembly, a bearing seat, a power transmission assembly and a guide assembly, wherein the material ejection cylinder is fixedly arranged on the frame and used as a power source for generating axial ejection force, the main shaft assembly is rotationally connected with the frame and provided with a feeding channel for accommodating the square bars, the main shaft assembly is driven by an external driving mechanism (such as a motor through a belt, a gear or a direct connection mode) to rotate at a high speed so as to drive the square bars in the main shaft assembly to synchronously rotate, the bearing seat is connected with the output end of the material ejection cylinder, one end of the power transmission assembly is rotationally connected with the bearing seat, the other end of the power transmission assembly is connected with the main shaft assembly, the core function of the power transmission assembly is to transmit linear ejection force generated by the material ejection cylinder to the square bars rotating in the main shaft assembly, and simultaneously can synchronously rotate along with the main shaft, so as to eliminate friction and interference caused by relative motion, the guide assembly comprises a guide rail and a moving seat, the moving seat is fixedly connected with the bearing seat, the moving seat is slidingly connected with the guide rail, the length direction of the guide rail is parallel to the length direction of the feeding channel, namely, the length direction of the feeding channel is strictly parallel to the length direction of the feeding channel, and the axial force is prevented from being parallel to the axial force or being parallel to the axial force. Preferably, the power transmission assembly comprises a large ejector rod and a small ejector rod which are sequentially connected, wherein the upper end of the large ejector rod is rotatably connected with the bearing seat through a bearing (such as a deep groove ball bearing and an angular contact bearing), so that the large ejector rod can freely rotate relative to the bearing seat, bu