Circular workpiece cutting tool

Abstract

The utility model relates to the technical field of cutting auxiliary tools, in particular to a circular workpiece cutting tool which comprises a mounting block, a mounting shaft and a rotating arm, the mounting shaft is arranged above the mounting block, the mounting shaft is rotatably connected with the mounting block, the rotating arm penetrates through the mounting shaft, the rotating arm is slidably connected with the mounting shaft, an extension arm is arranged in the rotating arm, and the extension arm is fixedly connected with the mounting block. The extension arm is slidably connected with the rotating arm, a rotating shaft is arranged above the rotating arm and rotatably connected with the rotating arm, a gear is fixedly mounted on the periphery of the rotating shaft, a rack is fixedly mounted above the extension arm and meshed with the gear, a worm gear is fixedly mounted on the periphery of the rotating shaft, and a worm is arranged above the rotating arm and rotatably connected with the rotating arm. The worm is meshed with the worm gear; the worm is rotated to drive the worm gear to rotate, rotation can be transmitted to the gear through the rotating shaft when the worm gear rotates, and the gear can drive the extension arm to stretch out and draw back in the rotating arm in cooperation with the rack when rotating.

Description

Technical Field

[0001] This utility model relates to the field of cutting auxiliary tools, and in particular to a cutting tool for circular workpieces. Background Technology

[0002] In daily electric welding operations, it is often necessary to cut workpieces in the shape of arcs and circles. Previously, a compass or circular material was used to first mark the lines on the steel plate, and then the cutting operation was carried out using methods such as oxy-fuel welding and plasma cutting. This required a high level of skill from the operators and often resulted in workpieces that were not round enough.

[0003] Currently, although cutting gauges that can assist in cutting arcs and circles have emerged, the rotating arms of current cutting gauges are usually quite long. When cutting small-radius workpieces, one end is always longer, which is inconvenient. They also take up a lot of space when stored, and the long rotating arms are easily bent or even broken.

[0004] Therefore, the rotating arms of the current cutting gauges are usually quite long. When cutting small-radius workpieces, one end is always longer, which is inconvenient and takes up a lot of space when stored. The long rotating arms are also prone to breakage. A circular workpiece cutting tool can be designed that allows the length of the rotating arm to be adjusted according to actual usage needs, making it convenient to cut small-radius workpieces. At the same time, when not in use, the rotating arm can be shortened and stored, reducing space occupation and preventing the rotating arm from being accidentally bent or even broken by external forces. Utility Model Content

[0005] To overcome the problems that current cutting gauges typically have long rotating arms, which are inconvenient when cutting small-radius workpieces, take up a lot of space when stored, and are also prone to bending or even breaking.

[0006] The technical solution of this utility model is as follows: a circular workpiece cutting tool, comprising a mounting block, a mounting shaft, and a rotating arm. The mounting shaft is disposed above the mounting block and is rotatably connected to the mounting block. The rotating arm passes through the mounting shaft and is slidably connected to the mounting shaft. An extension arm is disposed inside the rotating arm and is slidably connected to the rotating arm. A rotating shaft is disposed above the rotating arm and is rotatably connected to the rotating arm. A gear is fixedly mounted on the periphery of the rotating shaft. A rack is fixedly mounted above the extension arm and meshes with the gear. A worm gear is fixedly mounted on the periphery of the rotating shaft and is located on one side of the gear. A worm is disposed above the rotating arm and is rotatably connected to the rotating arm. The worm is located on one side of the worm gear and meshes with the worm gear.

[0007] Preferably, the mounting shaft is installed by setting a mounting block, and the rotating arm is installed by setting the mounting shaft, which can drive the rotating arm to rotate. By setting the rotating arm to slide inside the mounting shaft, it can assist in the cutting of circular workpieces of different diameters. By rotating the worm, the worm wheel can be driven to rotate. When the worm wheel rotates, it can transmit the rotation to the gear through the rotating shaft. When the gear rotates, it can drive the extension arm to extend and retract inside the rotating arm in conjunction with the rack. When cutting workpieces with larger diameters, the extension arm can be extended out of the rotating arm to cut the workpieces with larger diameters. When not in use, the extension arm can be retracted into the rotating arm without affecting the cutting of small diameter workpieces. It occupies less space when not in use, and the shorter rotating arm can prevent bending or even breakage caused by external forces.

[0008] Preferably, a magnet is fixedly installed at the bottom of the mounting block, and angle scale lines are opened on the upper surface of the mounting block.

[0009] Preferably, the mounting shaft has a first set screw inside, which is threaded to the mounting shaft, and a first rubber pad is fixedly installed below the first set screw.

[0010] Preferably, two sets of limit blocks are fixedly installed at one end of the rotating arm, and length scale lines are provided on the side walls of both the rotating arm and the extension arm.

[0011] Preferably, a connecting frame is fixedly installed at one end of the extension arm, and a retaining ring is fixedly installed on one side of the connecting frame.

[0012] Preferably, a set of internal threaded blocks are fixedly installed on both sides of the fixing ring. The internal threaded blocks are provided with a second set screw, which is threadedly connected to the internal threaded blocks. A second rubber pad is fixedly installed on one end of the second set screw.

[0013] Preferably, a mounting bracket is fixedly installed on one side of the fixing ring, and an auxiliary wheel is provided on one side of the mounting bracket, with the auxiliary wheel rotatably connected to the mounting bracket.

[0014] The beneficial effects of this utility model are:

[0015] 1. The rotating arm can be adjusted by sliding within the rotating shaft according to the actual diameter requirements of the workpiece, and the length scale line can be used for confirmation. If the radius of the workpiece is larger than the length of the rotating arm, the worm can be rotated to drive the worm wheel to rotate. When the worm wheel rotates, the rotation can be transmitted to the gear through the rotating shaft. When the gear rotates, it can drive the extension arm to slide out within the rotating arm in conjunction with the rack. This can accommodate the cutting of large-diameter workpieces. When cutting small-diameter workpieces, the extension arm is retracted inside the rotating arm to prevent one end from being too long and affecting the cutting operation.

[0016] 2. When the device is not in use, the worm gear can be rotated to retract the extension arm into the rotating arm, effectively reducing the storage space occupied. At the same time, the shorter rotating arm can prevent external impacts from causing the rotating arm to bend or even break. Attached Figure Description

[0017] Figure 1 The diagram shown is a three-dimensional structural schematic of the circular workpiece cutting tool of this utility model.

[0018] Figure 2 The diagram shown is a three-dimensional cross-sectional view of the circular workpiece cutting tool of this utility model.

[0019] Figure 3 The diagram shown is a three-dimensional cross-sectional view of the rotating arm of the circular workpiece cutting tool of this utility model.

[0020] Figure 4 The diagram shown is a three-dimensional structural schematic of one side of the connecting frame of the circular workpiece cutting tool of this utility model.

[0021] Explanation of reference numerals in the attached drawings: 1. Mounting block; 101. Magnet; 102. Angle scale line; 2. Mounting shaft; 201. First set screw; 202. First rubber pad; 3. Rotating arm; 301. Extension arm; 302. Rack; 303. Rotating shaft; 304. Gear; 305. Worm gear; 306. Worm; 307. Limiting block; 308. Length scale line; 401. Connecting frame; 402. Fixing ring; 403. Internal thread block; 404. Second set screw; 405. Second rubber pad; 406. Mounting frame; 407. Auxiliary wheel. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Please see Figure 2 and Figure 3This utility model provides an embodiment of a circular workpiece cutting tool, comprising a mounting block 1, a mounting shaft 2, and a rotating arm 3. The mounting shaft 2 is positioned above the mounting block 1 and is rotatably connected to the mounting block 1. The rotating arm 3 passes through the mounting shaft 2 and is slidably connected to the mounting shaft 2. An extension arm 301 is provided inside the rotating arm 3 and is slidably connected to the rotating arm 3. A rotating shaft 303 is positioned above the rotating arm 3 and is rotatably connected to the rotating arm 3. A gear 304 is fixedly mounted on the periphery of the rotating shaft 303. A rack 302 is fixedly mounted above the extension arm 301 and meshes with the gear 304. A worm gear 305 is fixedly mounted on the periphery of the rotating shaft 303 and is located on one side of the gear 304. A worm 306 is positioned above the rotating arm 3 and is rotatably connected to the rotating arm 3. The worm 306 is located on one side of the worm gear 305. The worm 306 meshes with the worm wheel 305. The mounting shaft 2 is installed by the mounting block 1, and the rotating arm 3 is installed by the mounting shaft 2, which can drive the rotating arm 3 to rotate. By setting the rotating arm 3 to slide inside the mounting shaft 2, it can assist in the cutting of circular workpieces of different diameters. By rotating the worm 306, the worm wheel 305 can be driven to rotate. When the worm wheel 305 rotates, the rotation can be transmitted to the gear 304 through the rotating shaft 303. When the gear 304 rotates, it can drive the extension arm 301 to extend and retract inside the rotating arm 3 in conjunction with the rack 302. When cutting workpieces with larger diameters, the extension arm 301 can be extended out of the rotating arm 3 to cut the workpieces with larger diameters. When not in use, the extension arm 301 can be retracted into the rotating arm 3, which does not affect the cutting of small diameter workpieces. It occupies less space when not in use, and the shorter rotating arm 3 can prevent bending or even breakage caused by external forces.

[0024] Please see Figure 1 and Figure 2 In this embodiment, a magnet 101 is fixedly installed below the mounting block 1, and an angle scale line 102 is provided on the upper surface of the mounting block 1. By setting the magnet 101, the mounting block 1 can be fixed to the surface of the metal workpiece to be cut. By setting the angle scale line 102, the cutting angle can be easily determined when cutting arc-shaped workpieces. A first set screw 201 is provided inside the mounting shaft 2. The first set screw 201 is threadedly connected to the mounting shaft 2. A first rubber pad 202 is fixedly installed below the first set screw 201. By setting the first set screw 201 to rotate, the first rubber pad 202 can be driven to adhere to or move away from the surface of the rotating arm 3, thereby locking the rotating arm 3 and preventing the rotating arm 3 from sliding accidentally during the cutting process. Two sets of limiting blocks 307 are fixedly installed at one end of the rotating arm 3. Length scale lines 308 are provided on the side walls of both the rotating arm 3 and the extension arm 301. By setting the limiting blocks 307, the sliding of the rotating arm 3 can be limited. By setting the length scale lines 308, the radius of the workpiece to be cut can be determined.

[0025] Please see Figure 1 and Figure 4 In this embodiment, a connecting frame 401 is fixedly installed at one end of the extension arm 301, and a fixing ring 402 is fixedly installed on one side of the connecting frame 401; a set of internally threaded blocks 403 are fixedly installed on both sides of the fixing ring 402, and a second setter screw 404 is provided inside the internally threaded block 403. The second setter screw 404 is threadedly connected to the internally threaded block 403, and a second rubber pad 405 is fixedly installed at one end of the second setter screw 404; a mounting frame 406 is fixedly installed on one side of the fixing ring 402, and an auxiliary wheel 407 is provided on one side of the mounting frame 406. The auxiliary wheel 407 is rotatably connected to the mounting frame 406; by setting The connecting bracket 401 installs the fixing ring 402. The fixing ring 402 is installed on the second set screw 404 through the internal thread block 403, which also limits the welding gun head. The second set screw 404 rotates within the internal thread block 403, which can drive the second rubber pad 405 to contact or move away from the outer wall of the gun head, so as to easily fix the welding gun head. The mounting bracket 406 installs the auxiliary wheel 407. When the rotating arm 3 rotates and moves the gun head, the auxiliary wheel 407 can effectively reduce friction and maintain the stability of the gun head height, so as to ensure that the gun head can perform cutting work stably.

[0026] When working, the magnet 101 can be used to fix the mounting block 1 at a suitable position on the surface of the metal workpiece to be cut. The welding gun head is placed inside the fixing ring 402. The second set screw 404 rotates in the internal thread block 403, which can drive the second rubber pad 405 to contact the outer wall of the gun head. This can easily fix the welding gun head and adapt to gun heads of different sizes.

[0027] Rotating the first set screw 201 causes the first rubber pad 202 to leave the upper surface of the rotating arm 3. The rotating arm 3 can be pulled and slid within the rotating shaft 303 according to the actual diameter requirements of the workpiece, and the length scale line 308 can be used for confirmation. If the radius of the required workpiece is larger than the length of the rotating arm 3, the worm 306 can be rotated. The rotation of the worm 306 drives the worm wheel 305 to rotate. When the worm wheel 305 rotates, the rotation can be transmitted to the gear 304 through the rotating shaft 303. When the gear 304 rotates, it can drive the extension arm 301 to slide out within the rotating arm 3, thereby adapting to the cutting of large-diameter workpieces.

[0028] During the cutting operation, the operator holds the cutting torch head and pushes the rotating arm 3 to rotate the mounting shaft 2, thereby guiding the cutting path of the cutting torch head. The angle scale 102 allows for determining the cutting angle when cutting curved workpieces. The auxiliary wheel 407 effectively reduces friction and maintains the stability of the torch head's height as the rotating arm 3 moves, ensuring stable cutting operations.

[0029] When not in use, the worm gear 306 can be rotated to retract the extension arm 301 into the interior of the rotating arm 3, effectively reducing the storage space occupied. At the same time, the shorter rotating arm 3 can prevent external impacts from causing the rotating arm 3 to bend or even break.

[0030] Through the above steps, the worm gear 306 rotates, driving the worm wheel 305 to rotate. When the worm wheel 305 rotates, the rotation can be transmitted to the gear 304 through the rotating shaft 303. When the gear 304 rotates, it cooperates with the rack 302 to drive the extension arm 301 to freely extend and retract within the rotating arm 3. When cutting large-diameter workpieces, the extension arm 301 extends to meet the needs. When cutting small-diameter workpieces and not in use, the extension arm 301 can be retracted into the rotating arm 3 to reduce the impact on the cutting work. At the same time, it reduces the space occupied during storage. The shorter rotating arm 3 can also reduce the possibility of bending or even breaking due to external forces. This solves the problem that the rotating arm 3 of the current cutting gauge is usually too long. When cutting small-radius workpieces, one end is always too long, which is not convenient. It also occupies a lot of space when stored. The long rotating arm 3 is also easy to bend or even break.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A circular workpiece cutting tool, comprising a mounting block (1), characterized in that: It also includes a mounting shaft (2) and a rotating arm (3). The mounting shaft (2) is located above the mounting block (1) and is rotatably connected to the mounting block (1). The rotating arm (3) passes through the mounting shaft (2) and is slidably connected to the mounting shaft (2). An extension arm (301) is provided inside the rotating arm (3) and is slidably connected to the rotating arm (3). A rotating shaft (303) is located above the rotating arm (3) and is rotatably connected to the rotating arm (3). A gear (304) is fixedly installed on the periphery. A rack (302) is fixedly installed above the extension arm (301). The rack (302) meshes with the gear (304). A worm wheel (305) is fixedly installed on the periphery of the rotating shaft (303). The worm wheel (305) is located on one side of the gear (304). A worm (306) is provided above the rotating arm (3). The worm (306) is rotatably connected to the rotating arm (3). The worm (306) is located on one side of the worm wheel (305). The worm (306) meshes with the worm wheel (305).

2. The circular workpiece cutting tool according to claim 1, characterized in that: A magnet (101) is fixedly installed below the mounting block (1), and an angle scale line (102) is opened on the upper surface of the mounting block (1).

3. The circular workpiece cutting tool according to claim 1, characterized in that: The mounting shaft (2) is provided with a first set screw (201) inside. The first set screw (201) is threadedly connected to the mounting shaft (2). A first rubber pad (202) is fixedly installed below the first set screw (201).

4. The circular workpiece cutting tool according to claim 1, characterized in that: Two sets of limit blocks (307) are fixedly installed at one end of the rotating arm (3), and length scale lines (308) are provided on the side walls of the rotating arm (3) and the extension arm (301).

5. A circular workpiece cutting tool according to claim 1, characterized in that: A connecting frame (401) is fixedly installed at one end of the extension arm (301), and a fixing ring (402) is fixedly installed on one side of the connecting frame (401).

6. A circular workpiece cutting tool according to claim 5, characterized in that: A set of internal threaded blocks (403) are fixedly installed on both sides of the fixing ring (402). A second set screw (404) is provided inside the internal threaded block (403). The second set screw (404) is threadedly connected to the internal threaded block (403). A second rubber pad (405) is fixedly installed at one end of the second set screw (404).

7. A circular workpiece cutting tool according to claim 5, characterized in that: A mounting bracket (406) is fixedly installed on one side of the fixed ring (402), and an auxiliary wheel (407) is provided on one side of the mounting bracket (406). The auxiliary wheel (407) is rotatably connected to the mounting bracket (406).

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