Pipe cutting machine with fixed spindle and built-in clamping mechanism

Abstract

A pipe cutting machine with fixed main shaft and built-in clamping mechanism, comprising a box body and a hollow main shaft arranged inside, the front end of the main shaft being a cutter head, the main shaft being fixedly installed inside the box body, a cutter head rotating drive mechanism being arranged outside the main shaft, the cutter head rotating drive mechanism being connected to the cutter head, a clamping mechanism being arranged inside the main shaft for clamping a steel pipe arranged inside the main shaft, the cutter head being connected to a feed mechanism, and the feed mechanism performing pipe cutting action through a feed drive mechanism. The pipe cutting machine with fixed main shaft and built-in clamping mechanism avoids that the cut workpiece hits the cutter, resulting in collapse of the cutter edge.

Description

Technical Field

[0001] This invention belongs to the technical field of pipe cutting machines, specifically referring to a pipe cutting machine with a fixed spindle and a built-in clamping mechanism. Background Technology

[0002] Pipe cutting machines are widely used in industrial production as common pipe cutting equipment.

[0003] Currently, the rotation of the cutter head in pipe cutting machines is driven by the rotation of the spindle. A long section of pipe is fed to the spindle hole at the front cutter head inlet of the pipe cutting machine for cutting. For example, the pipe cutting machine disclosed in Chinese Invention Patent 201510099278.3 and the feeding device of a pipe cutting machine disclosed in Chinese Invention Patent Application 202010883358.9 are examples of pipe cutting machines where the workpiece is fed from the front cutter head into the inside of the pipe cutting machine. Then, the front feeding mechanism clamps the workpiece and cuts it by the rotation of the cutter at the cutter head.

[0004] The existing pipe cutting machine has the following disadvantages: 1. When the cut workpiece falls into the pipe cutting machine, it is easy to hit the cutting blade, causing the blade to break; 2. The cut workpiece falling into the pipe cutting machine is not conducive to the handling of the cut workpiece. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a pipe cutting machine with a fixed spindle and a built-in clamping mechanism to prevent the cut workpiece from hitting the cutting blade and causing the blade to break.

[0006] This invention is implemented as follows: A pipe cutting machine with a fixed spindle and a built-in clamping mechanism includes: a housing and a hollow spindle inside, wherein the front end of the spindle is a cutter head. The spindle is fixedly installed inside the housing; a cutter head rotation drive mechanism is provided outside the spindle, and the cutter head rotation drive mechanism is connected to the cutter head; a clamping mechanism is provided inside the spindle for clamping the steel pipe disposed inside the spindle. The cutter head is connected to a feed mechanism, which performs the tube cutting action through a feed drive mechanism.

[0007] Furthermore, a feeding mechanism is provided at the rear end of the pipe cutting machine to feed the steel pipe into the main shaft from the rear end. The steel pipe is clamped by the clamping mechanism inside the main shaft. The cutting blade is driven to rotate by the cutter disc at the front end of the main shaft to cut the steel pipe. The cut steel pipe is then clamped away by the external clamp at the front end of the pipe cutting machine.

[0008] Furthermore, the clamping mechanism includes: a spring collet, a collet locking sleeve, a push cylinder, a push cylinder connecting block, and a hydraulic cylinder; The spring collet, the collet locking sleeve, and the push cylinder are located inside the main shaft, while the hydraulic cylinder is located outside the main shaft. The rear end of the spring collet is threadedly connected to the front end of the collet locking sleeve. The rear end of the collet locking sleeve extends outside the main shaft and is fixed to the housing. The push cylinder is sleeved around the collet locking sleeve. Push cylinder connecting blocks are provided at both ends of the push cylinder. The push cylinder connecting blocks pass through the notch opened on the main shaft and connect to the hydraulic cylinder. When the hydraulic cylinder pushes forward, it drives the push cylinder to push forward, and the spring collet clamps the steel pipe by pushing forward.

[0009] Furthermore, the clamping mechanism also includes a push sleeve; the push sleeve is located inside the push cylinder and is designed separately from the push cylinder for easy replacement after wear.

[0010] Furthermore, the cutter head rotation drive mechanism includes: a first bearing, a rotating outer sleeve, a large gear, a small gear, a drive shaft, and a motor; The first bearing is sleeved near the front end of the spindle, and the first bearing is provided with the rotating sleeve. The front end of the rotating sleeve is connected to the cutter head, and the rear end of the rotating sleeve is connected to the large gear. The large gear and the small gear mesh with each other. The small gear is driven to rotate by the drive shaft and the motor connected to the rear end, which drives the large gear and the cutter head to rotate.

[0011] Furthermore, the feed drive mechanism includes: a bearing push ring, a lead screw assembly, a slider, a guide rail, and a rack and pinion ring; The nut in the lead screw assembly is locked onto the bearing push ring. When the lead screw in the lead screw assembly rotates, it pushes the bearing push ring to move back and forth. The sliders are fixed on both sides of the bearing push ring. The sliders slide with the guide rails. The guide rails on both sides are fixed on the housing. The rack and pinion ring is fitted onto the rotating outer sleeve and transmits rotational power to the rotating outer sleeve through a key. The outer ring of the rack and pinion ring is fixed inside the bearing push ring by a second bearing. The rotating outer sleeve drives the rack and pinion ring to rotate through the key. The forward and backward movement of the bearing push ring drives the rack and pinion ring to move forward and backward. The rack and pinion ring is fixedly connected to the feed mechanism, driving it to complete the feed action.

[0012] The advantages of this invention are: 1. The present invention has a fixed spindle and a built-in clamping mechanism. The feed direction can enter from the rear end of the pipe cutter. The cut workpiece falls outside the front end of the pipe cutter and can be clamped away by other external clamps during cutting to avoid contact with the cutting tool.

[0013] 2. In this invention, the main shaft does not rotate; only the cutter head rotates. The cutter head is located at the front end of the fixed hollow main shaft. The reduction of rotating parts can reduce the vibration of the overall equipment and improve its stability.

[0014] 3. This invention uses a ball screw to drive the bearing pusher ring to achieve tool advance and retraction, which has high precision.

[0015] 4. The clamping mechanism of this invention is housed within the hollow spindle. The clamping mechanism employs a circular spring collet, concentric with the cutter head, to avoid misalignment between the external clamp and the cutter head. Simultaneously, the built-in clamping device reduces workpiece suspension, further improving stability during cutting. Attached Figure Description

[0016] The present invention will now be further described with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention after the box body is removed.

[0018] Figure 2 This is the front view of the present invention.

[0019] Figure 3 yes Figure 2 KK cross-section diagram.

[0020] Figure 4 yes Figure 2 A three-dimensional cross-sectional view of the penis.

[0021] Figure 5 yes Figure 2 Cross-sectional view of JJ.

[0022] Figure label: 1-Spindle, 2-Chuck locking sleeve, 3-Spring chuck, 4-Push cylinder, 5-Push sleeve, 6-First bearing, 7-Rotating outer sleeve, 8-Large gear, 9-Small gear, 10-Drive shaft, 11-Cutter head, 12-Cutter post seat, 13-Geared cutter post slide, 14-Cutter bar fixing seat, 15-Feed gear, 16-Feed gear seat, 17-Feed rack, 18-Rack slide sleeve, 19-Feed rack locking block, 20-Rack slide ring, 21-Second bearing, 22-Bearing push sleeve ring, 23-Lead screw, 24-Slider, 25-Guide rail, 50-Box, 100-Clamping mechanism, 200-Cutter head rotary drive mechanism, 300-Feed drive mechanism, 400-Steel pipe. Detailed Implementation

[0023] like Figures 1 to 5As shown, a pipe cutting machine with a fixed spindle and a built-in clamping mechanism includes: a housing 50 and a hollow spindle 1 inside, the front end of the spindle 1 being a cutter head 11, the spindle 1 being fixedly installed inside the housing 50; a cutter head rotation drive mechanism 200 is provided outside the spindle 1, the cutter head rotation drive mechanism 200 being connected to the cutter head 11; a clamping mechanism 100 is provided inside the spindle 1 for clamping a steel pipe 400 disposed inside the spindle 1; The cutter head 11 is connected to a feed mechanism, which performs the tube cutting action through a feed drive mechanism 300.

[0024] The pipe cutting machine is equipped with a feeding mechanism at the rear end, which is used to feed the steel pipe 400 into the main shaft 1 from the rear end. The steel pipe 400 is clamped by the clamping mechanism 100 in the main shaft 1. The cutting blade is driven to rotate by the cutter disc 11 at the front end of the main shaft 1 to cut the steel pipe 400. The cut steel pipe 400 is clamped away by the external clamp at the front end of the pipe cutting machine.

[0025] In this invention, the main shaft 1 does not rotate, only the cutter head 11 rotates. The cutter head 11 is set at the front end of the fixed hollow main shaft 1. The number of rotating parts is reduced, which can reduce the vibration of the overall equipment and improve the stability of the equipment.

[0026] The clamping mechanism 100 includes: a spring collet 3, a collet locking sleeve 2, a push cylinder 4, a push sleeve 5, a push cylinder connecting block 41, and a hydraulic cylinder 42. The rear end of the spring collet 3 is threaded to the front end of the collet locking sleeve 2. The rear end of the collet locking sleeve 2 extends out of the main shaft 1 and is fixed on the housing 50. The push cylinder 4 is sleeved around the collet locking sleeve 2. Both the left and right ends of the push cylinder 4 are provided with push cylinder connecting blocks 41. The push cylinder connecting blocks 41 pass through the notch opened on the main shaft 1 and connect to the oil cylinder 42 outside the main shaft 1. When the oil cylinder 42 pushes forward, it drives the push cylinder 4 to push forward, and the spring collet 3 clamps the steel pipe by pushing forward. The push sleeve 5 is located inside the push cylinder 4 and is used to push the spring collet 3. Because it is easy to wear, the push sleeve 5 and the push cylinder 4 are made separately for easy replacement after wear.

[0027] The clamping mechanism 100 of the present invention is disposed inside the hollow spindle 1. The clamping mechanism 100 uses a circular spring collet 3, which is concentric with the cutter head 11, thus avoiding misalignment between the external clamp and the cutter head 11. At the same time, the built-in clamping mechanism reduces the amount of workpiece suspended in the air, further improving the stability during cutting.

[0028] The cutter head rotation drive mechanism 200 includes: a first bearing 6, a rotating outer sleeve 7, a large gear 8, a small gear 9, a drive shaft 10, a cutter head 11, and a motor (not shown in the figure). A first bearing 6 is fitted near the front end of the hollow spindle 1. A rotating outer sleeve 7 is provided on the first bearing 6. A cutter head 11 is connected to the front end of the rotating outer sleeve 7. A large gear 8 is connected to the rear end of the rotating outer sleeve 7. The large gear 8 meshes with a small gear 9. The small gear 9 is driven by a drive shaft 10 and a motor connected to the rear to rotate, thereby driving the large gear 8 and the cutter head 11 to rotate.

[0029] The spindle of the existing pipe cutting machine is rotating, and its cutter head rotation drive mechanism is driven by the spindle. The spindle of the present invention is fixed. Therefore, the cutter head rotation drive mechanism 200 is driven by the rotating outer sleeve 7 sleeved around the spindle.

[0030] The feed mechanism includes: a cutter head 11 and two tool holder seats 12. Each tool holder seat 12 has a toothed tool holder slide 13, and a tool shank fixing seat 14 is fixed to the toothed tool holder slide 13. The tool shank fixing seat 14 is used to fix and lock the tool shank. A feed gear 15 meshes with the toothed tool holder slide 13, and the feed gear 15 is connected to a feed gear seat 16 via a gear shaft. The feed gear seat 16 is fixed to the cutter head 11. The rotation of the feed gear 15 is driven by a feed rack 17. The feed rack 17 moves back and forth, causing the feed gear 15 to rotate. The toothed tool holder slide 13 meshing with the feed gear 15 slides on the tool holder seat 12 to complete the feed action. The rear end of the feed rack 17 is fixedly connected to a rack sliding ring 20 via a feed rack locking block 19.

[0031] The feed drive mechanism 300 includes: a bearing push ring 22, a lead screw assembly 23, a slider 24, a guide rail 25, and a rack and pinion ring 20; The nut in the lead screw assembly 23 is locked on the bearing push ring 22. When the lead screw in the lead screw assembly 23 rotates, it pushes the bearing push ring 22 to move back and forth. Slider blocks 24 are fixed on both sides of the bearing push ring 22. The sliders 24 slide with the guide rails 25. The guide rails 25 on both sides are fixed on the housing 50. The rack and pinion ring 20 is fitted on the rotating outer sleeve 7 and transmits rotational power to the rotating outer sleeve 7 through a key. The outer ring of the rack and pinion ring 20 is fixed inside the bearing push ring 22 through the second bearing 21. The rotating outer sleeve 7 drives the rack and pinion ring 20 to rotate through the key. The bearing push ring 22 moves back and forth, driving the rack and pinion ring 20 to move back and forth. The rack and pinion ring 20 is fixedly connected to the feed rack 17 in the feed mechanism, driving it to complete the feed action.

[0032] This invention uses a ball screw to drive the bearing pusher ring 22 to achieve tool advance and retraction, and the use of a ball screw ensures high precision. In contrast, the existing tool advance drive method involves a driving gear driving a driven gear to rotate the threaded outer sleeve, thereby moving the sleeve with the inner sleeve back and forth to achieve tool advance. This method produces a gap in the engagement of the two driving and driven gears, and there is also a gap between the inner and outer sleeves, resulting in a larger cumulative precision error.

[0033] The main shaft 1 of the present invention is fixed and has a built-in clamping mechanism 100. Its feeding direction can enter from the rear end of the pipe cutter. The cut workpiece falls outside the front end of the pipe cutter and can be clamped away by other external clamps during cutting to avoid contact with the cutting tool.

[0034] In this invention, the main shaft 1 does not rotate, only the cutter head 11 rotates. The cutter head 11 is set at the front end of the fixed hollow main shaft 1. The number of rotating parts is reduced, which can reduce the vibration of the overall equipment and improve the stability of the equipment.

[0035] The clamping mechanism 100 of the present invention is disposed inside the hollow spindle 1. The clamping mechanism 100 uses a circular spring collet 3, which is concentric with the cutter head 11 to avoid misalignment between the external clamp and the cutter head 11. At the same time, the built-in clamping mechanism 100 reduces the amount of workpiece suspended in the air, thus improving the stability during cutting.

[0036] The above embodiments and figures are not intended to limit the product form and style of the present invention. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of the present invention.

Claims

1. A pipe cutting machine with a fixed spindle and a built-in clamping mechanism, comprising: The housing and the hollow spindle inside, with a cutter head at the front end of the spindle. The main shaft is fixedly installed inside the housing; a cutter head rotation drive mechanism is provided outside the main shaft, and the cutter head rotation drive mechanism is connected to the cutter head; a clamping mechanism is provided inside the main shaft for clamping the steel pipe disposed inside the main shaft. The cutter head is connected to a feed mechanism, which performs the tube cutting action through a feed drive mechanism.

2. A pipe cutting machine with a fixed spindle and a built-in clamping mechanism as described in claim 1, characterized in that: The pipe cutting machine is equipped with a feeding mechanism at the rear end, which is used to feed the steel pipe into the main shaft from the rear end. The steel pipe is clamped by the clamping mechanism inside the main shaft. The cutting blade is driven to rotate by the cutter disc at the front end of the main shaft to cut the steel pipe. The cut steel pipe is then clamped away by the external clamp at the front end of the pipe cutting machine.

3. A pipe cutting machine with a fixed spindle and a built-in clamping mechanism as described in claim 1, characterized in that: The clamping mechanism includes: a spring collet, a collet locking sleeve, a push cylinder, a push cylinder connecting block, and a hydraulic cylinder; The spring collet, the collet locking sleeve, and the push cylinder are located inside the main shaft, while the hydraulic cylinder is located outside the main shaft. The rear end of the spring collet is threadedly connected to the front end of the collet locking sleeve. The rear end of the collet locking sleeve extends outside the main shaft and is fixed to the housing. The push cylinder is sleeved around the collet locking sleeve. Push cylinder connecting blocks are provided at both ends of the push cylinder. The push cylinder connecting blocks pass through the notch opened on the main shaft and connect to the hydraulic cylinder. When the hydraulic cylinder pushes forward, it drives the push cylinder to push forward, and the spring collet clamps the steel pipe by pushing forward.

4. A pipe cutting machine with a fixed spindle and a built-in clamping mechanism as described in claim 3, characterized in that: The clamping mechanism further includes a push sleeve; the push sleeve is located inside the push cylinder and is designed separately from the push cylinder for easy replacement after wear.

5. A pipe cutting machine with a fixed spindle and a built-in clamping mechanism as described in claim 1 or 2, characterized in that: The cutter head rotation drive mechanism includes: a first bearing, a rotating outer sleeve, a large gear, a small gear, a drive shaft, and a motor; The first bearing is sleeved near the front end of the spindle, and the first bearing is provided with the rotating sleeve. The front end of the rotating sleeve is connected to the cutter head, and the rear end of the rotating sleeve is connected to the large gear. The large gear and the small gear mesh with each other. The small gear is driven to rotate by the drive shaft and the motor connected to the rear end, which drives the large gear and the cutter head to rotate.

6. A pipe cutting machine with a fixed spindle and a built-in clamping mechanism as described in claim 5, characterized in that: The feed drive mechanism includes: a bearing push ring, a lead screw assembly, a slider, a guide rail, and a rack and pinion ring; The nut in the lead screw assembly is locked onto the bearing push ring. When the lead screw in the lead screw assembly rotates, it pushes the bearing push ring to move back and forth. The sliders are fixed on both sides of the bearing push ring. The sliders slide with the guide rails. The guide rails on both sides are fixed on the housing. The rack and pinion ring is fitted onto the rotating outer sleeve and transmits rotational power to the rotating outer sleeve through a key. The outer ring of the rack and pinion ring is fixed inside the bearing push ring by a second bearing. The rotating outer sleeve drives the rack and pinion ring to rotate through the key. The forward and backward movement of the bearing push ring drives the rack and pinion ring to move forward and backward. The rack and pinion ring is fixedly connected to the feed mechanism, driving it to complete the feed action.

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