An automated grinding device for metal pipes

Abstract

The present application belongs to grinding device, specifically relates to a kind of metal pipeline automatic grinding device.A kind of metal pipeline automatic grinding device, wherein, including rotating mechanism around on metal pipeline, set on rotating mechanism centring positioning mechanism, push mechanism and grinding device, wherein centring positioning mechanism is used to align the center of metal pipeline, push mechanism is used to drive grinding device to move.The remarkable effect of the present application is: the present application only needs to be sleeved with annular guide rail on the outside of metal pipeline during use, then centring positioning mechanism is connected with metal pipeline fixed, so that annular guide rail and metal pipeline are coaxial.

Description

Technical Field

[0001] This invention pertains to grinding devices, specifically to an automated grinding device for metal pipes. Background Technology

[0002] Pressure piping refers to piping systems that withstand internal or external pressure, used for the transportation, distribution, mixing, separation, discharge, metering, control, and prevention of fluid flow. It consists of multiple components, including pipes, fittings, flanges, bolted connections, gaskets, valves, other components or pressure-bearing parts, and supports. These components are connected together by welding, threaded connections, or other connection methods to form a complete piping system.

[0003] During the construction of nuclear power units in China, metal pressure pipelines are fixed together by welding. The welded joints are not smooth and contain oxide scale and weld slag. For applications with high requirements, such as nuclear power equipment, the welds on the outer walls of metal pressure pipelines must be smooth; weld quality is crucial to the safe and reliable operation of the system. Currently, the grinding of the outer surfaces of pressure pipelines used in nuclear power plants is done manually. However, manual grinding is often difficult on the side closest to walls or furthest from people, and it is inefficient and yields unsatisfactory results. Summary of the Invention

[0004] This invention addresses the shortcomings of existing technologies by providing an automated grinding device for metal pipes.

[0005] The present invention is implemented as follows: an automated grinding device for metal pipes, comprising a rotating mechanism surrounding the metal pipe, and a centering and positioning mechanism, a pushing mechanism and a grinding device arranged on the rotating mechanism, wherein the centering and positioning mechanism is used to align with the center of the metal pipe, and the pushing mechanism is used to drive the grinding device to move.

[0006] As described above, an automated grinding device for metal pipes includes a centering and positioning mechanism comprising a fixed motor base with screw holes for fixed connection between the centering and positioning mechanism and the rotating mechanism. A support foot is provided on the side of the fixed motor base facing the metal pipe, and the support foot has an arc-shaped groove matching the outer surface of the metal pipe. A limit sensor is also provided on the side of the fixed motor base facing the metal pipe, and a stepper motor, a lead screw, and a guide post are respectively provided on the side of the fixed motor base facing away from the metal pipe.

[0007] The automated grinding device for metal pipes described above includes four centering and positioning mechanisms, which are evenly arranged along the rotating mechanism.

[0008] As described above, an automated metal pipe grinding device includes a pushing mechanism comprising a lifting mechanism with a threaded hole for fixing the pushing mechanism to a rotating mechanism. The lifting mechanism is provided with a cross-arm axial feed mechanism, and a grinding machine fixing device is provided on the cross-arm axial feed mechanism for fixing the grinding wheel. A support frame is provided below the grinding machine fixing device.

[0009] As described above, an automated metal pipe grinding device includes a lifting mechanism comprising a base plate, a laser ranging mounting plate on the side wall of the base plate, a positioning sensor and a laser ranging sensor mounted on the laser ranging mounting plate, a top plate at the top of the base plate, a lead screw stepper motor above the top plate, a tail plate at the bottom of the base plate, a guide post between the top plate and the tail plate, a slider on the guide post, and a connecting hole on the slider for connection with a cross arm axial feed mechanism.

[0010] As described above, an automated grinding device for metal pipes includes a rotating mechanism comprising a ring track, a fixed plate mounted on the ring track, and rollers and a stepper motor-driven gear mounted on the fixed plate.

[0011] As described above, an automated grinding device for metal pipes includes a groove on a circular track, and a fixed plate moves along the groove via rollers.

[0012] As described above, an automated grinding device for metal pipes includes four rollers, two of which are positioned above and two below the groove.

[0013] In the aforementioned automated metal pipe grinding device, when multiple annular tracks form the entire track, adjacent annular tracks are fixedly connected by connecting plates.

[0014] The significant advantages of this invention are: 1. In the process of using this invention, it is only necessary to put the annular guide rail on the outside of the metal pipe, and then connect and fix the centering positioning mechanism to the metal pipe so that the annular guide rail and the metal pipe are coaxial.

[0015] 2. In the clamping process of the entire grinding device, this invention employs four compression mechanisms to fix the entire grinding device. Furthermore, limit sensors are installed on the support legs to limit the vertical movement of the stepper motor-driven lead screw. This prevents damage to the compression mechanisms and metal pipes caused by the stepper motor continuously driving the lead screw during clamping.

[0016] 3. The present invention adds a positioning sensor and a distance sensor to the rotating mechanism. When the rotating mechanism drives the pushing mechanism, the positioning sensor can locate the position of the compression mechanism, and the distance sensor can measure the distance between the rotating mechanism and the surface of the metal pipe. If there is a slight deviation in the position of the four compression mechanisms, it can be finely adjusted to make the annular guide rail and the metal pipe coaxial, so as to ensure the processing quality of the grinding device.

[0017] 4. In the axial feed design of the propulsion mechanism of this invention, based on the principle of the lifting platform, a lead screw stepper motor is used to drive the cross arm to perform axial feed motion. The structure is simple, and it allows for precise control of the axial feed of the angle grinder.

[0018] 5. In this invention, the angle grinder is fixed to the support frame. After the angle grinder is turned on, the torque generated by the grinding wheel during the grinding of the weld seam of the metal pipe can be partially offset by the support frame, so as to avoid the grinding wheel from shifting position and causing processing quality problems of the grinding device. Attached Figure Description

[0019] Figure 1 This invention relates to an automatic metal pipe grinding device.

[0020] Figure 2 The present invention is a center positioning mechanism

[0021] Figure 3 The push mechanism of this invention

[0022] Figure 4 The lifting mechanism in the pushing mechanism of this invention

[0023] Figure 5 The cross-arm axial feed mechanism in the pushing mechanism of this invention

[0024] Figure 6 Rotating mechanism of the present invention

[0025] Figure 7 The grinding device of the present invention

[0026] In the diagram: 1. Centering and positioning mechanism, 2. Rotation mechanism, 3. Pushing mechanism, 4. Grinding device, 5. Metal pipe, 110. Support foot, 120. Fixed motor base, 130. Stepper motor, 140. Lead screw, 150. Guide column, 160. Limit sensor, 210. Circular track, 220. Roller, 240. Stepper motor drive gear, 250. Fixing plate, 260. Connecting piece, 310. Lifting mechanism, 311. Base plate, 312. 313. Laser rangefinder mounting plate; 314. Positioning sensor; 315. Top plate; 316. Lead screw stepper motor; 317. Slider; 318. Guide post; 319. Laser rangefinder sensor; 320. Tail plate; 321. Cross arm axial feed mechanism; 322. Base plate; 323. Fork arm; 324. Rotary shaft; 325. Top plate; 326. Motor mounting plate; 330. Grinding machine fixing device; 340. Support frame; 410. Grinding wheel. Detailed Implementation

[0027] An automatic grinding device for weld seams in metal pressure pipelines mainly comprises a centering and positioning mechanism, a rotating mechanism, a pushing mechanism, and a grinding mechanism. The centering and positioning mechanism includes four compression mechanisms, with the entire grinding device secured by four support legs. The rotating mechanism includes two semi-circular annular guide rails, rollers, and gears. The gears on the rotating mechanism engage with pins in the annular guide rails, driving the rollers to move along the guide rails. The pushing mechanism includes a lifting mechanism and a cross-arm feed mechanism, with the pushing mechanism fixed to the rotating mechanism. A grinding device for grinding the weld seam is also included, fixed to a support frame connected to the cross-arm feed mechanism, which drives the angle grinder axially.

[0028] The centering and positioning mechanism comprises four compression mechanisms (also called centering and positioning mechanisms). Each compression mechanism includes a stepper motor, a lead screw, a spring, a limit sensor, and a support foot. The compression mechanism is fixed to the annular guide rail of the rotating mechanism via a support base. The stepper motors in the four compression mechanisms simultaneously drive the lead screw downwards. A compression stop is mounted at the bottom of the lead screw. As the lead screw moves downwards, the compression stop compresses the spring in the support foot cavity, thus centering and positioning the grinding device. A pressure block guide rod is installed at each end of the support foot, guiding its vertical movement. Limit sensors are mounted on the compression mechanisms to control the stepper motors driving the lead screw up and down.

[0029] The rotating mechanism includes two semi-circular annular pipes, gears, rollers, positioning sensors, and distance sensors. The two semi-circular annular guide rails are fixed by connecting plates, which are in turn fixed to the guide rails by two pins. A stepper motor drives the gears, which engage with the pins in the guide rails, causing the rollers to move along the annular guide rails. As the rollers move along the annular guide rails, the positioning sensors locate the four compression mechanisms fixed to the guide rails. Simultaneously, the distance sensors measure the distance from the rotating mechanism to the metal pipe, determining whether the annular guide rail is coaxial with the metal pipe. Any slight discrepancies can be adjusted using the compression mechanisms.

[0030] The pushing mechanism mainly consists of two parts: a lifting mechanism to control the up-and-down movement of the angle grinder, and a cross-arm feed mechanism to control the axial movement of the angle grinder. The pushing mechanism is fixed to the rotating mechanism via a base plate, and the rotating mechanism drives the pushing mechanism to move in a circular motion along the metal pipe. The lifting mechanism includes a lead screw stepper motor, guide posts, a slider, and a tail plate. The lead screw stepper motor drives the slider, which is sleeved on the guide posts, to move up and down. During the slider's movement, the guide posts guide the slider. The cross-arm feed mechanism includes a lead screw stepper motor and four cross-arm assemblies. The lead screw stepper motor drives the cross arms to extend and retract, thereby achieving the axial feed of the grinding device.

[0031] The grinding unit mainly consists of an angle grinder, which is fixed to a support frame of the crossarm feed mechanism via a grinding machine fixing device. Two roller bearings are installed at the bottom of the support frame, and the bottom of the support frame is designed with an arc shape to provide support for the angle grinder and prevent it from shifting due to high torque during grinding.

[0032] The metal pressure pipeline weld grinding device according to the above technical requirements consists of a centering positioning machine rotation mechanism, a pushing mechanism and a grinding device, which grinds the weld at a predetermined position; the rotation mechanism drives the pushing mechanism to rotate, and the pushing mechanism drives the grinding device to move radially and axially, so that the weld grinding device grinds the weld at the connection of two metal pipe sections.

[0033] Here is a specific example.

[0034] Please see Figure 1This embodiment provides a metal pressure pipeline weld grinding device, including a centering and positioning mechanism 1, a rotating mechanism 2, a pushing mechanism 3, and a grinding device 4. A fixed motor base 120 is fixed between the centering and positioning mechanism 1 and the rotating mechanism 2. The pushing mechanism 3 is fixed to a fixed plate 250 on the rotating mechanism via a base plate 311. The grinding device 4 is threadedly connected to a support frame 340, which is fixed to a slider 316 on the pushing mechanism 3. The slider 316 moves up and down, driving the grinding device 4 to move up and down. During automatic grinding of the metal pressure pipeline weld, a guide rail is installed at a predetermined position, and the centering and positioning mechanism positions the automatic metal pipeline weld grinding device. (See reference...) Figure 2 In the centering positioning mechanism 2, the stepper motor is fixed on a fixed motor base between the centering positioning mechanism 1 and the rotating mechanism 2. The stepper motor 110 drives the lead screw 140 to move vertically. During the vertical movement of the lead screw, a limit sensor 160 installed below the fixed motor base 120 that fixes the centering positioning mechanism 1 and the rotating mechanism 2 limits the displacement of the lead screw 140. When the lead screw 140 moves to the distance set by the sensor, the stepper motor 130 stops driving the lead screw 140. A compression stop is installed at the bottom of the lead screw, and a spring is installed in the cavity of the support foot 110. When the lead screw 140 moves vertically, it drives the compression stop to compress the spring, causing the support foot 110 to clamp the metal conduit. The centering positioning mechanism 1 is designed with four identical compression mechanisms. During the centering positioning of the device, the stepper motors 130 on the four compression mechanisms simultaneously drive the lead screw 140 to perform the above-mentioned vertical movement, thereby centering the device and making the device and the metal pipe coaxial. A guide post 150 is added to each of the left and right ends of the support foot. The guide post 150 is fitted onto the fixed motor base 120, which is fixed to the centering positioning mechanism 1 and the rotating mechanism 2. During the vertical movement of the lead screw 140 driven by the stepper motor 130, the guide post 150 guides the lead screw 140. (See reference...) Figure 3 , Figure 4 and Figure 5After positioning the automatic grinding device for metal pressure pipelines and the axis of the metal pipeline as described above, the grinding device 4 is pushed to the weld seam of the metal pipeline by the pushing mechanism 3. The pushing mechanism mainly consists of a lifting mechanism and an axial feed mechanism of the angle grinder. In order to enable the rotating mechanism 2 to drive the pushing mechanism 3 to rotate during rotation, the base plate 311 of the pushing mechanism 3 and the fixing plate 250 of the rotating mechanism 2 are connected and fixed by bolts. In the lifting mechanism, the slider 316 is driven to rise and fall by the lead screw stepper motor 315 mounted on the top plate 314. A guide post 317 is installed at each end of the tail plate 319 of the lifting mechanism. The guide post 317 passes through the slider 316 and guides the slider 316 during the rising and falling process. During the process of the lead screw stepper motor 315 driving the slider to fall, the lead screw stepper motor 315 stops when the support frame 340 supports the metal pipeline. The grinding device 4 is pushed to the starting grinding position using the cross-arm axial feed mechanism in the pushing mechanism 3. The base plate 321 in the cross-arm axial feed mechanism and the slider 316 in the lifting mechanism are fixed by bolts. During the lifting and lowering of the slider 316, the cross-arm axial feed mechanism can be driven to lift and lower. (See reference...) Figure 3 and Figure 7 The grinding device 4 is pushed to the designated grinding position, the angle grinder is turned on, and the grinding wheel 410 begins to work. The angle grinder is fixed by the grinding machine fixing device 330 and screwed to the support frame 340 of the pushing mechanism 3. (See reference...) Figure 4 and Figure 6 The rotating mechanism 2 drives the entire pushing mechanism 3 and grinding device 4 to grind along the outer wall of the metal pipe. Two semi-circular annular tracks 210 in the rotating mechanism are connected by connecting pieces 260, which are fixed to the annular guide rails 210 by pins. Four rollers 220 are mounted on the fixed plate 250. The upper and lower sets of rollers are engaged in the grooves of the annular guide rails 210. The rollers 220 are composed of roller bearings and rubber rings, which allows for better engagement with the grooves in the annular guide rails 210 and facilitates their movement along the grooves. Gears fixed to the fixed plate are driven by a stepper motor, and gears 240 engage with the pins on the annular guide rails 210, driving the rollers 220 to move along the grooves, thus rotating the entire fixed plate 250. The positioning sensor 313 and the laser rangefinder 318 are fixed to the base plate 311 of the pushing mechanism via a laser rangefinder mounting plate 312. During the rotation process, the positioning sensor 313 and the laser rangefinder 318 detect the centering positioning of the metal pipe grinding device. The positioning sensor 313 positions the four compression mechanisms in the centering positioning mechanism 1, and the laser rangefinder 318 measures the distance between the pushing mechanism and the metal pipe at the position of the compression mechanism. It is determined whether the distances measured by the laser rangefinder 318 are the same at the positions of the four compression mechanisms, and then fine adjustments are made.

[0035] In summary, the automatic grinding device for metal pressure pipelines provided in this paper only requires placing the device on the outside of the pipeline to grind the weld seam at the connection of the metal pipeline. Then, it is connected and fixed to the metal pipeline through the centering positioning mechanism, so that the annular guide rail in the rotating mechanism is coaxial with the metal pipeline. Then, the grinding device is pushed to the grinding position by the pushing mechanism, and then the angle grinder is turned on. The angle grinder is driven by the rotating mechanism to perform grinding, which effectively replaces manual grinding, with high efficiency and good grinding effect.

Claims

1. An automated grinding device for metal pipes, characterized in that: It includes a rotating mechanism (2) surrounding the metal pipe (5), and a centering positioning mechanism (1), a pushing mechanism (3) and a grinding device (4) are provided on the rotating mechanism (2), wherein the centering positioning mechanism (1) is used to align the center of the metal pipe (5), and the pushing mechanism (3) is used to drive the grinding device (4) to move. The centering positioning mechanism (1) includes a fixed motor base (120), which has screw holes for fixing the centering positioning mechanism (1) and the rotating mechanism (2). The fixed motor base (120) is provided with a support foot (110) on the side facing the metal pipe (5). The support foot (110) is provided with an arc groove that matches the outer surface of the metal pipe (5). The fixed motor base (120) is also provided with a limit sensor (160) on the side facing the metal pipe (5). The fixed motor base (120) is provided with a stepper motor (130), a lead screw (140) and a guide post (150) on the side facing away from the metal pipe (5). The pushing mechanism (3) includes a lifting mechanism (310), which has a threaded hole. The lifting mechanism (310) is used to fix the pushing mechanism (3) and the rotating mechanism (2). A cross arm axial feed mechanism (320) is provided on the lifting mechanism (310). A grinding machine fixing device (330) is provided on the cross arm axial feed mechanism (320). The grinding machine fixing device (330) is used to fix the grinding wheel (410). A support frame (340) is provided below the grinding machine fixing device (330). The lifting mechanism (310) includes a base plate (311), a laser rangefinder mounting plate (312) is provided on the side wall of the base plate (311), a positioning sensor (313) and a laser rangefinder sensor (318) are provided on the laser rangefinder mounting plate (312), a top plate (314) is provided at the top of the base plate (311), a lead screw stepper motor (315) is provided above the top plate (314), a tail plate (319) is provided at the bottom of the base plate (311), a guide post (317) is provided between the top plate (314) and the tail plate (319), a slider (316) is provided on the guide post (317), and a connecting hole is provided on the slider (316) for connecting with the cross arm axial feed mechanism (320).

2. The automated metal pipe grinding device as described in claim 1, characterized in that: Four centering positioning mechanisms (1) are set up and evenly arranged along the rotating mechanism (2).

3. The automated metal pipe grinding device as described in claim 2, characterized in that: The rotating mechanism (2) includes a ring track (210), a fixed plate (250) is provided on the ring track (210), and a roller (220) and a stepper motor drive gear (240) are provided on the fixed plate (250).

4. The automated metal pipe grinding device as described in claim 3, characterized in that: A groove is provided on the circular track (210), and the fixing plate (250) moves along the groove via rollers (220).

5. The automated metal pipe grinding device as described in claim 4, characterized in that: Four rollers (220) are provided, two on the top and two on the bottom of the groove.

6. The automated metal pipe grinding device as described in claim 5, characterized in that: When multiple circular tracks (210) form the entire track, adjacent circular tracks (210) are fixedly connected by connecting pieces.

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