Pipe end chamfering clamp

Abstract

The present application belongs to the technical field of machining, and particularly relates to a pipe end chamfering clamp, which comprises a clamping part for clamping a pipe-shaped workpiece, wherein the clamping part comprises a plurality of vertical columns and a V-shaped clamp installed on the vertical columns for supporting the pipe-shaped workpiece; the clamping part is further provided with an automatic polishing part for chamfering the end face of the pipe-shaped workpiece, and the automatic polishing part automatically polishes the end face of the end face of the pipe-shaped workpiece placed in the clamping part. The traditional static clamping function and the automatic polishing function are integrated on one tool, the transformation from pure manual operation to semi-automatic or automatic machining is realized, and the problem of how to automatically rotate the pipe without frequent clamping to uniformly polish the entire circumferential end face of the pipe is solved. Meanwhile, a safety limiting structure is added, and the limiting block prevents the pipe from axially moving or even falling off when the pipe is rotating or under accidental stress.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a fixture for chamfering the ends of pipes. Background Technology

[0002] During the machining of pipes, it is often necessary to chamfer or deburr the ends to remove sharp edges produced after cutting, facilitating subsequent welding and assembly, and improving operational safety. Traditional pipe end chamfering methods typically have the following problems: First, for long or heavy tubular workpieces, manual chamfering and grinding is not only labor-intensive and inefficient, but also makes it difficult to ensure uniform chamfer angles and surface quality. The processing accuracy depends entirely on the operator's experience, resulting in poor product quality stability.

[0003] Secondly, existing fixtures typically only offer basic clamping functionality. During grinding, operators need to manually rotate the pipe or move the hand grinder around the pipe end, which not only poses safety hazards and can easily lead to workplace injuries, but also fails to guarantee the uniformity and consistency of the processing. For applications requiring specific chamfer angles (such as weld bevels), manual angle control is even more difficult to achieve precisely.

[0004] Furthermore, while some automated equipment on the market can solve some problems, they are often complex in structure and expensive, making them unsuitable for small and medium-sized enterprises or workshops to carry out flexible production of small batches and multiple varieties. They usually lack convenient angle adjustment functions, and the debugging process is cumbersome, time-consuming, and labor-intensive when switching between pipes of different specifications and with different chamfering requirements.

[0005] Therefore, there is an urgent need to develop a special fixture that integrates clamping and automated grinding, can automatically drive the workpiece to rotate, and can flexibly adjust the grinding angle, in order to solve the problems of low efficiency, unstable processing quality, insufficient safety and poor flexibility in the existing technology. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this application provides a basic overall architecture that integrates traditional static clamping functions with automatic grinding functions into a single tooling, enabling a shift from purely manual operation to semi-automatic or automatic processing. The tooling includes a clamping unit for holding tubular workpieces, comprising multiple columns and V-shaped clamps mounted on the columns to support the tubular workpieces. The clamping unit also includes an automatic grinding unit for chamfering the end faces of the tubular workpieces, which automatically grinds the end faces of the tubular workpieces placed in the clamping unit.

[0007] Preferably, multiple sets of free rollers and active rollers are arranged sequentially along the axis on the two inner sides of the V-shaped clamp. The active rollers rotate through a first driving part located on the outer side of the V-shaped clamp, thereby driving the tubular workpiece located in the V-shaped clamp to rotate through contact friction, so that the automatic grinding part can uniformly grind the end face of the tubular workpiece. At least one end of the V-shaped clamp is provided with a limiting block to prevent the tubular workpiece from falling out of the V-shaped clamp.

[0008] Preferably, the automatic grinding unit includes: a stand, a motor base, a second drive unit, a mounting base, an angle adjuster, a vertical rod, a grinding head, a universal coupling, and a bearing sleeve. One end of the V-shaped clamp is provided with a stand on the ground, and the top of the stand is provided with a mounting base. The motor base is mounted on the mounting base, and the second drive unit is mounted on the motor base. The output end of the second drive unit is connected to the grinding head via a universal coupling. The angle adjuster is mounted on the mounting base, and the upwardly extending vertical rod is rotatably mounted on the angle adjuster. A bearing sleeve is fitted onto the grinding head shaft, and the bearing sleeve is fixedly connected to the vertical rod. The angle adjuster is used to control the rotation of the vertical rod around its axis.

[0009] Preferably, the angle adjuster includes a housing, a pressing shaft, a first bevel gear, a second bevel gear, a fixed tooth, a double-sided bevel gear, and a spring. The pressing shaft is rotatably mounted in the housing, with one end extending out of the housing. The pressing shaft can slide relative to the housing along its axis. A section of the pressing shaft within the housing has a first bevel gear and a second bevel gear with opposite conical surfaces mounted from top to bottom. A vertical rod is rotatably mounted in the housing, parallel to the axis of the pressing shaft. A section of the vertical rod within the housing has a double-sided bevel gear that meshes with the tooth surfaces of the first and second bevel gears, respectively. A spring is sleeved on the pressing shaft to push the second bevel gear towards the double-sided bevel gear. A fixed tooth is fixedly mounted inside the housing, so that when the second bevel gear meshes with the double-sided bevel gear, it also meshes with the fixed tooth.

[0010] Preferably, the stand and the mounting base are slidably connected by a first slide rail, the length direction of which is perpendicular to the axis of the V-shaped clamp.

[0011] Preferably, the housing and the mounting base are slidably connected by a second slide rail, the length direction of which is parallel to the axis of the V-shaped clamp.

[0012] Preferably, the universal coupling is a two-stage constant velocity coupling.

[0013] Compared with the prior art, the present invention provides a pipe end chamfering fixture, which has the following advantages: 1. By combining clamping and grinding functions, the turnaround time of workpieces between different workstations is reduced, and the overall processing efficiency is improved.

[0014] 2. This invention addresses the challenge of enabling the pipe to rotate automatically without frequent clamping, thus achieving uniform grinding of its entire circumferential end face. Simultaneously, a safety limiting structure is added. The limiting blocks prevent the pipe from axially shifting or even falling off during rotation or due to accidental force, protecting the workpiece surface from scratches and improving operational safety. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 for Figure 1 A magnified view of a portion of the image; Figure 3 This is a schematic diagram of the internal structure of the angle adjuster of the present invention.

[0016] In the diagram: 1. Column; 2. V-shaped clamp; 3. Free roller; 4. Drive roller; 5. First drive unit; 6. Stand; 7. Motor base; 8. Second drive unit; 9. Mounting base; 10. Limiting block; 11. First slide rail; 12. Second slide rail; 13. Angle adjuster; 1301. Housing; 1302. Pressing shaft; 1303. First bevel gear; 1304. Second bevel gear; 1305. Fixed gear; 1306. Double-sided bevel gear; 1307. Spring; 14. Upright pole; 15. Grinding head; 16. Universal coupling; 17. Bearing sleeve. 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] Example The following is combined Figures 1 to 3This application introduces a pipe end chamfering fixture, including a clamping part for holding a tubular workpiece. The clamping part includes multiple columns 1 and V-shaped clamps 2 mounted on the columns 1 for supporting the tubular workpiece. The clamping part also includes an automatic grinding part for chamfering the end face of the tubular workpiece. The automatic grinding part automatically grinds the end face of the tubular workpiece placed in the clamping part. This provides a basic overall architecture that integrates traditional static clamping and automatic grinding functions into a single fixture, realizing a shift from purely manual operation to semi-automatic or automatic processing. By combining clamping and grinding functions, the turnaround time of the workpiece between different workstations is reduced, improving overall processing efficiency. The introduction of the automatic grinding part lays the foundation for automated processing, reduces reliance on operator skills, and makes stable processing quality possible.

[0019] Multiple sets of free rollers 3 and active rollers 4 are arranged sequentially along the axis on the two inner sides of the V-shaped clamp 2. The active rollers 4 are rotated by a first driving part 5 located on the outer side of the V-shaped clamp 2, thereby driving the tubular workpiece located in the V-shaped clamp 2 to rotate through contact friction, facilitating uniform grinding of the end face of the tubular workpiece by the automatic grinding unit. At least one end of the V-shaped clamp 2 is provided with a limiting block 10 to prevent the tubular workpiece from detaching from the V-shaped clamp 2. This solves the problem of how to make the tube rotate automatically without frequent clamping, so as to achieve uniform grinding of its entire circumferential end face. At the same time, the addition of a safety limiting structure, through the friction driving of the active rollers 4 to drive the tube to rotate, allows the grinding head 15 to be fixed in one position to perform uniform grinding of the rotating tube end face in the entire circumference, completely solving the problem of uneven grinding by manual grinding. The worker only needs to put the tube into the V-groove, without clamping it tightly, and the workpiece can contact the rollers by its own weight, making loading and unloading very convenient.

[0020] The automatic grinding unit includes: a stand 6, a motor base 7, a second drive unit 8, a mounting base 9, an angle adjuster 13, a vertical rod 14, a grinding head 15, a universal coupling 16, and a bearing sleeve 17. One end of the V-shaped clamp 2 is provided with the stand 6 on the ground. The top of the stand 6 is provided with the mounting base 9. The motor base 7 is mounted on the mounting base 9. The second drive unit 8 is mounted on the motor base 7. The output end of the second drive unit 8 is connected to the grinding head 15 via the universal coupling 16. The angle adjuster 13 is mounted on the mounting base 9. The angle adjuster 13 rotatably mounts the upwardly extending vertical rod 14. The bearing sleeve 17 is sleeved on the rotating shaft of the grinding head 15. The bearing sleeve 17 is fixedly connected to the vertical rod 14. The angle adjuster 13 is used to control the rotation of the vertical rod 14 around its axis. Specifically, the mechanical structure of the automatic grinding unit is constructed, and a core function is realized—the precise adjustment of the angle of the grinding head 15 to adapt to different chamfering requirements. The angle of the upright 14 is changed by the angle adjuster 13, thereby precisely setting and locking the working angle of the grinding head 15 to meet the needs of various chamfering specifications. It is highly flexible. The use of the universal coupling 16 allows the power of the second drive unit 8 (motor) to be efficiently transmitted to the grinding head 15 even after the angle of the grinding head 15 is changed, thus solving the problem of non-concentric transmission.

[0021] The angle adjuster 13 includes a housing 1301, a pressing shaft 1302, a first bevel gear 1303, a second bevel gear 1304, a fixed gear 1305, a double-sided bevel gear 1306, and a spring 1307. The pressing shaft 1302 is rotatably mounted in the housing 1301. One end of the pressing shaft 1302 extends out of the housing 1301, and the pressing shaft 1302 can slide relative to the housing 1301 along its axis. A section of the pressing shaft 1302 located within the housing 1301 is fitted with a first bevel gear 1303 and a second bevel gear 1304 with opposing conical surfaces, mounted from top to bottom. A vertical rod 14 is rotatably mounted in housing 1301. The vertical rod 14 is parallel to the axis of the pressing shaft 1302. A double-sided bevel gear 1306 is installed on a section of the vertical rod 14 located in housing 1301, meshing with the tooth surfaces of the first bevel gear 1303 and the second bevel gear 1304 respectively. A spring 1307 is sleeved on the pressing shaft 1302 to push the second bevel gear 1304 towards the double-sided bevel gear 1306. A fixed tooth 1305 is fixedly installed inside housing 1301. When the second bevel gear 1304 meshes with the double-sided bevel gear 1306, it also meshes with the fixed tooth 1305. This achieves an integrated function of "unlocking-adjusting-locking," and the operation process is ergonomic, simple, intuitive, and easy for workers to learn.

[0022] The stand 6 and the mounting base 9 are slidably connected by a first slide rail 11, the length direction of which is perpendicular to the axis of the V-shaped clamp 2. By sliding adjustment, the contact depth between the grinding head 15 and the end face of the pipe can be controlled, thereby producing chamfers of different widths and adapting to pipes of different diameters.

[0023] The outer casing 1301 and the mounting base 9 are slidably connected by a second slide rail 12, the length direction of which is parallel to the axis of the V-shaped clamp 2. This allows the entire angle adjuster 13 and grinding head 15 assembly to move along the axis of the tube. The universal coupling 16 is a two-stage constant velocity coupling. Optimizing power transmission efficiency and quality, the constant velocity coupling ensures that the input and output shafts maintain the same speed at any angle, avoiding the speed fluctuation problem of ordinary universal couplings 16, resulting in smoother operation of the grinding head 15 and higher surface quality.

[0024] Example 1: refer to Figure 1 , Figure 2 and Figure 3 A pipe end chamfering fixture, mainly comprising a clamping part and an automatic grinding part.

[0025] The clamping part consists of two parallel columns 1 and a V-shaped clamp 2 mounted on them. Two sets of rollers are installed along the length of the two inner inclined surfaces of the V-shaped clamp 2: one set is a freely rotating free roller 3, and the other set is a motor-driven active roller 4. A first drive unit 5 (e.g., a motor with a reducer) driving the active roller 4 is installed on the outer surface of the V-shaped clamp 2. A detachable limit stop 10 is installed at one end of the V-shaped clamp 2.

[0026] The automatic grinding unit is located at the front right end of the V-clamp 2. A stand 6 is fixed to the ground or workbench. A mounting base 9 is mounted on the top of the stand 6 via a first slide rail 11, the guide direction of which is perpendicular to the axis of the V-clamp 2. A motor base 7 is bolted to the mounting base 9, and a grinding motor, serving as a second drive unit 8, is mounted on the motor base 7. The output shaft of the grinding motor is connected to the grinding head 15 (such as a cup-shaped grinding wheel 15) via a two-stage constant velocity universal coupling 16. A bearing sleeve 17 is fitted on the rotating shaft of the grinding head 15 to support the rotating shaft of the grinding head 15. An angle adjuster 13 is mounted on the mounting base 9 via a second slide rail 12, the guide direction of which is parallel to the axis of the V-clamp 2. An adjustable vertical rod 14 is rotatably mounted inside the housing 1301 of the angle adjuster 13. The bearing sleeve 17 is fixedly connected to the top of the vertical rod 14 via a connecting plate. The angle adjuster 13 adopts, for example... Figure 3Structure: The pressing shaft 1302, driven by an internal spring 1307, normally engages the second bevel gear 1304 with the double-sided bevel gear 1306 and the fixed internal gear ring, achieving locking. When angle adjustment is required, pressing the pressing shaft 1302 overcomes the force of the spring 1307, disengaging the second bevel gear 1304 from the fixed gear 1305. Then, rotating the pressing shaft 1302 drives the upright 14 and its grinding head 15 to rotate as a whole through the transmission of the first bevel gear 1303 and the double-sided bevel gear 1306. After the angle is adjusted, releasing the pressing shaft 1302 relocks it under the action of the spring 1307.

[0027] During operation, the tubular workpiece is placed in the V-shaped fixture 2, with its right end abutting against the limiting block 10. The first drive unit 5 is activated, and the active roller 4 drives the tube to rotate at a uniform speed through friction. According to the processing requirements, the angle of the grinding head 15 is set via the angle adjuster 13, and the appropriate position of the grinding head 15 is adjusted along the first slide rail 11 and the second slide rail 12. The grinding motor is started, and the grinding head 15 rotates at high speed. The mounting base 9 is manually pushed along the first slide rail 11 to slowly feed towards the end face of the tube, thus performing uniform and precise chamfering on the rotating end face of the tube.

[0028] Example 2: This embodiment has a basically the same structure as the previous embodiment, the main difference being the configuration and degree of automation of the clamping part.

[0029] In this embodiment, the clamping part includes four columns 1, which together support an extended V-shaped clamp 2 to accommodate the processing of extra-long pipes. Limiting blocks 10 are provided at both ends of the V-shaped clamp 2. These limiting blocks 10 are pneumatically or electrically controlled telescopic blocks integrated into the control system. The first driving unit 5 is a servo motor, which not only drives the active roller 4 but also works in conjunction with the grinding motor. The rotational speed of the pipe is controlled by a central controller (PLC) to match the grinding feed speed.

[0030] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pipe end chamfering fixture, comprising a clamping part for clamping a tubular workpiece, the clamping part comprising a plurality of columns (1) and a V-shaped clamp (2) mounted on the columns (1) for supporting the tubular workpiece; characterized in that, The clamping part is also provided with an automatic grinding part for chamfering the end face of the tubular workpiece. The automatic grinding part automatically grinds the end face of the tubular workpiece placed in the clamping part. The automatic grinding part includes: a stand (6), a motor base (7), a second drive unit (8), a mounting base (9), an angle adjuster (13), a vertical rod (14), a grinding head (15), a universal coupling (16), and a bearing sleeve (17). The stand (6) is provided on the ground at one end of the V-shaped clamp (2). The mounting base (9) is provided on the top of the stand (6). The motor base (7) is mounted on the mounting base (9). The second drive unit (8) is mounted on the motor base (8). The drive unit (8) has a grinding head (15) connected to its output end via a universal coupling (16). An angle adjuster (13) is mounted on the mounting base (9). An upwardly extending upright rod (14) is rotatably mounted on the angle adjuster (13). A bearing housing (17) is sleeved on the shaft of the grinding head (15). The bearing housing (17) is fixedly connected to the upright rod (14). The angle adjuster (13) is used to control the rotation of the upright rod (14) around its axis. The angle adjuster (13) includes a housing (1301), a pressing shaft (1302), and a first bevel gear (1303). The housing (1301) includes a second bevel gear (1304), a fixed gear (1305), a double-sided bevel gear (1306), and a spring (1307). A pressing shaft (1302) is rotatably mounted in the housing (1301). One end of the pressing shaft (1302) extends out of the housing (1301). The pressing shaft (1302) can slide relative to the housing (1301) along its axis. A section of the pressing shaft (1302) located in the housing (1301) has a first bevel gear (1303) and a second bevel gear (1304) with opposite conical surfaces mounted from top to bottom. A vertical rod (14) is rotatably mounted in the housing (1301). The upright (14) is parallel to the axis of the pressing shaft (1302). A section of the upright (14) located in the outer shell (1301) is equipped with a double-sided bevel gear (1306) that meshes with the tooth surfaces of the first bevel gear (1303) and the second bevel gear (1304). A spring (1307) is sleeved on the pressing shaft (1302) to push the second bevel gear (1304) towards meshing with the double-sided bevel gear (1306). A fixed tooth (1305) is fixedly installed inside the outer shell (1301). When the second bevel gear (1304) meshes with the double-sided bevel gear (1306), it also meshes with the fixed tooth (1305).

2. The pipe end chamfering fixture according to claim 1, characterized in that: Multiple sets of free rollers (3) and active rollers (4) are arranged sequentially along the axis on the two inner sides of the V-shaped clamp (2). The active rollers (4) rotate through the first driving part (5) provided on the outer side of the V-shaped clamp (2), thereby driving the tubular workpiece located in the V-shaped clamp (2) to rotate through contact friction, so that the automatic grinding part can uniformly grind the end face of the tubular workpiece. At least one end of the V-shaped clamp (2) is provided with a limiting block (10) to prevent the tubular workpiece from falling out of the V-shaped clamp (2).

3. A pipe end chamfering fixture according to claim 1, characterized in that: The stand (6) and the mounting base (9) are slidably connected by a first slide rail (11), the length direction of which is perpendicular to the axis of the V-shaped clamp (2).

4. A pipe end chamfering fixture according to claim 1, characterized in that: The outer shell (1301) and the mounting base (9) are slidably connected by a second slide rail (12), the length direction of which is parallel to the axis of the V-shaped clamp (2).

5. A pipe end chamfering fixture according to claim 1, characterized in that: The universal coupling (16) is a two-stage constant velocity coupling.

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