A small pipe beveling machine and method of use

Abstract

This invention discloses a small pipe beveling grinder and its usage method. The small pipe beveling grinder includes a fixture for fixing the pipe, a grinding device, and a driving device. The fixture is a folding four-bar structure with a reverse lead screw as its central axis. The reverse lead screw is connected to the driving device, and the driving device drives the fixture to extend and retract via the reverse lead screw. The grinding device includes a grinding rotating ring and a rotating groove. The grinding rotating ring includes an outer ring, an inner fixed shaft, and a rotating ring connecting strip connecting the outer ring and the inner fixed shaft. The inner fixed shaft is connected to the driving device. The outer ring is arranged in the rotating groove and rotates freely within the groove. A grinding strip is fixed on the rotating ring connecting strip, and the grinding strip rotates with the rotation of the inner fixed shaft. The small pipe beveling grinder of this invention has good fixing stability, uses grinding to open beveles with minimal damage to the pipe, has a simple structure, and the fixture and grinding device are driven by the same set of driving devices, resulting in low cost. The usage method is simple and easy to operate.

Description

Technical Field

[0001] This invention relates to the field of pipeline installation technology, and specifically to a small pipeline beveling grinder and its usage method. Background Technology

[0002] During electromechanical installation, some pipelines require welding. Relevant specifications for welded pipelines require beveling at the pipe ends. However, the small pipes purchased in practice are generally not beveled at the ends, necessitating beveling. Current beveling methods typically involve fixing the steel pipe to a beveling machine or fixing the beveling machine to the steel pipe, then using a beveling tool to rotate the steel pipe circumferentially to cut the end face. Alternatively, some workers directly use an angle grinder to grind the end face.

[0003] The above operating methods have the following drawbacks: 1. Fixing the beveling machine to the pipe, the beveling machine generally uses a cutting method, which will result in uneven cutting due to the instability of the fixing itself. Moreover, it is all done manually, so it cannot achieve automated beveling; 2. Pipe-fixed beveling machines are generally large in size and inconvenient to move; 3. Manual grinding with an angle grinder requires high skill from the operator and is slow.

[0004] To address the above shortcomings, CN 102962521 A discloses a pipe beveling machine, which utilizes a hydraulic tightening device and a hydraulic cutting feed device to fix the beveling machine to the pipe and to move the cutter head in and out. This improves the degree of automation and reduces manual labor intensity. It features fast tightening speed, large tightening force, stable cutting, a compact structure, small size, wide pipe adaptability, and portability. With appropriate devices, one person can easily install and remove the machine from the pipe. CN 113500428 A discloses a beveling machine with good applicability, suitable for both circular and non-circular steel pipes. However, the aforementioned devices are complex in structure and often inconvenient to operate.

[0005] Therefore, it is of great practical significance to develop a beveling machine that is simple in structure, easy to operate, has good reliability in fixing pipelines, is small in size, and can achieve automated beveling with high beveling efficiency. Summary of the Invention

[0006] In view of the above-mentioned defects in the existing technology, the present invention provides a beveling machine with simple structure, convenient operation, good pipeline fixing reliability, small size, and high efficiency in automated beveling, so as to overcome the defects of existing beveling machines such as complex structure, inconvenient operation, poor fixing reliability, poor portability and low beveling efficiency.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A small pipe beveling grinder includes a fixture for fixing the pipe, a grinding device, and a drive device;

[0009] The fixture is a folding four-bar structure with a reverse screw as the central axis. The reverse screw is connected to the drive device, and the drive device drives the fixture to extend and retract through the reverse screw to fix or loosen the pipe.

[0010] The grinding device includes a grinding rotating ring and a rotating groove. The grinding rotating ring includes an outer ring, an inner fixed shaft, and a rotating ring connecting strip connecting the outer ring and the inner fixed shaft. The inner fixed shaft is connected to a driving device. The outer ring is arranged in the rotating groove and can rotate freely in the rotating groove. A grinding strip is fixed on the rotating ring connecting strip. The grinding strip rotates with the rotation of the inner fixed shaft, so that the bevel of the small pipe to be ground can be ground.

[0011] The fixture of the small pipe beveling grinder is telescopic. The beveling machine can be centered and firmly fixed on the pipe that needs to be beveled by driving the reverse screw through the drive device; the presence of the rotating groove can prevent the grinding rotating ring from shaking during the grinding process.

[0012] The small pipe beveling grinder of the present invention has a relatively simple structure. The fixture is a foldable four-bar structure, which has good fixing reliability. The fixture and the grinding device can be driven by the same set of drive devices, which is inexpensive and can greatly improve the beveling efficiency, and has great application prospects.

[0013] As a preferred technical solution:

[0014] As described above, in a small pipe beveling grinder, the driving device is a motor;

[0015] The drive device is connected to the reverse lead screw and the inner fixed shaft respectively through the adjusting gearbox;

[0016] The inner fixed shaft is coaxial with the outer ring.

[0017] As described above, in a small pipe beveling grinder, the inner fixed shaft is a hollow shaft, and the reverse lead screw passes through the hollow part of the inner fixed shaft.

[0018] The adjusting gearbox includes a reverse lead screw gear, an inner fixed shaft gear, a drive motor gear, and an adjusting gear. The reverse lead screw gear and the inner fixed shaft gear are coaxial and arranged in parallel. The reverse lead screw gear is fixed to the reverse lead screw, and the inner fixed shaft gear is fixed to the inner fixed shaft. The external tooth structure of the reverse lead screw gear and the inner fixed shaft gear is the same.

[0019] The drive motor gear is fixedly connected to the motor drive shaft. The adjusting gear is sleeved on the drive motor gear, and the adjusting gear and the drive motor gear do not rotate relative to each other. The external teeth of the adjusting gear match the external teeth of the reverse lead screw gear. The adjusting gear is fixed with a gear adjusting rod. By sliding the adjusting gear along the axial direction of the drive motor gear through the gear adjusting rod, it can mesh with the reverse lead screw gear or the internal fixed shaft gear respectively. In order to enable the grinding ring to move slightly back and forth along the pipe direction on a fixed basis to achieve the grinding function, a certain degree of freedom is allowed for the shaft and gear on the fixing shaft of the adjusting box to achieve the grinding function. Lubricant is applied between the gears and other transmission mechanisms.

[0020] In the small pipe beveling grinder described above, the reverse lead screw gear, the internal fixed shaft gear, the drive motor gear, and the adjusting gear are all arranged inside the adjusting gearbox.

[0021] The gearbox housing has a first adjusting rod hole that matches the gear adjusting rod. The gear adjusting rod extends out of the gearbox housing from the first adjusting rod hole. The first adjusting rod hole is strip-shaped and its arrangement direction is consistent with the sliding direction of the adjusting gear.

[0022] As described above, in a small pipe beveling grinder, a certain gap is left between the rotating groove and the outer ring, and the rotating groove is fixedly connected to the grinder housing through a rotating groove connector.

[0023] As described above, in a small pipe beveling grinder, the rotating ring connecting strip has multiple grinding strip fixing holes along its length.

[0024] As described above, in a small pipe beveling grinder, the grinding strip includes a grinding strip grinding part and a grinding strip fixing part that are connected to each other;

[0025] The grinding strip fixing part matches the grinding strip fixing hole, and the outer wall of the grinding strip fixing part away from the grinding part end of the grinding strip has a retaining spring groove for arranging retaining springs.

[0026] After the grinding strip fixing part passes through the grinding strip fixing hole, the grinding strip can be fixed on the grinding strip fixing hole using a retaining spring. The retaining spring gives the grinding strip the property of easy removal, adjustment and installation. The grinding surface of the grinding strip can be designed according to design requirements to adapt to grinding different angle slopes. By selecting the fixing position of the grinding strip, it can be adapted to pipes of different diameters and achieve the purpose of saving costs.

[0027] As described above, in a small pipe beveling grinder, the grinding surface of the grinding strip grinding section is a bevel.

[0028] The small pipe beveling grinder described above also includes a grinder housing;

[0029] The drive unit and adjusting gearbox are arranged inside the grinding machine housing, and the fixture and grinding device are fixed on the same side of the grinding machine housing.

[0030] The grinding machine housing is also equipped with a control board, which is electrically connected to the drive device. The control board is connected to a power plug located outside the grinding machine housing via a power supply line. The grinding machine housing has heat dissipation holes (to enable the machine to operate normally and effectively dissipate the heat inside the beveling machine) and a second adjustment rod hole for the gear adjustment rod to extend out.

[0031] The grinding machine housing is equipped with a closed main handle, and a switch is located on the main handle. The switch is electrically connected to the control board. The grinding machine housing is also equipped with a rod-shaped auxiliary handle, which is perpendicular to the gripping direction of the main handle.

[0032] Furthermore, the present invention also provides a method of using a small pipe beveling grinder as described above, comprising the following steps:

[0033] (1) Select and install grinding strips according to the specific conditions of the pipe bevel to be ground;

[0034] (2) After placing the pipe with the bevel to be ground on the outside of the shrink-shaped fixture, adjust the gear adjusting rod to make the adjusting gear mesh with the reverse lead screw gear;

[0035] (3) Turn on the switch, and the drive device will drive the reverse screw to rotate so that the retainer extends and the retainer contacts and abuts against the inner wall of the pipe.

[0036] (4) By adjusting the gear adjusting rod to make the adjusting gear mesh with the inner fixed shaft gear, turn on the switch, the drive device drives the grinding strip to rotate, and gently push the grinding machine into the pipe to perform pipe beveling.

[0037] (5) After grinding, adjust the gear adjusting rod to engage the adjusting gear with the reverse lead screw gear, turn on the switch, and the drive device will drive the reverse lead screw to rotate, causing the retainer to retract, and the beveled pipe can be removed. The method of use is simple, the operation is convenient, the work efficiency is high, and it has great application prospects.

[0038] The above technical solution is only one feasible technical solution of the present invention. The scope of protection of the present invention is not limited thereto. Those skilled in the art can reasonably adjust the specific design according to actual needs.

[0039] The above invention has the following advantages or beneficial effects:

[0040] (1) The small pipe beveling grinder of the present invention has good stability of the central fixing device. When beveling by grinding, the problem of the beveling not meeting the requirements due to excessive cutting force will not occur.

[0041] (2) The small pipe beveling grinder of the present invention is small in size, light in weight, easy to carry / operate, does not require much pipe handling during use, is highly efficient, and uses grinding to open beveling, which causes less damage to the pipe.

[0042] (3) The small pipe beveling grinder of the present invention has a relatively simple structure. The fixture and the grinding device can be driven by the same set of drive devices, which is inexpensive.

[0043] (4) The method of using the small pipe beveling grinder of the present invention is simple to operate, has high work efficiency, and has great application prospects. Attached Figure Description

[0044] The invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings, the emphasis being on illustrating the gist of the invention.

[0045] Figure 1 This is a schematic diagram of the small pipe beveling grinder of the present invention;

[0046] Figure 2 This is a cross-sectional schematic diagram of the small pipe beveling grinder of the present invention;

[0047] Figure 3 This is a schematic diagram of the transmission assembly of the small pipe beveling grinder of the present invention;

[0048] Figure 4 This is a schematic diagram of the fixation device;

[0049] Figure 5 This is a schematic diagram of a polishing bar;

[0050] Figure 6 A schematic diagram for polishing the rotating ring;

[0051] Figure 7 This is a schematic diagram of a rotating groove;

[0052] Figure 8 This is a schematic diagram of adjusting the gearbox;

[0053] Figure 9 A schematic diagram for adjusting the drive shaft inside the gearbox;

[0054] Among them, 1-fixer, 2-grinding strip, 3-grinding rotating ring, 4-rotating groove, 5-secondary handle, 6-main handle, 7-switch, 8-power plug, 9-heat dissipation hole, 10-gear adjusting rod, 11-adjusting gearbox, 12-motor, 13-control board, 14-grinding part of grinding strip, 15-grinding strip fixing part, 16-circlip, 17-grinding strip fixing hole, 18-outer ring; 19-inner fixed shaft, 20-rotating ring connecting strip, 21-rotating groove connecting piece, 22-adjusting gearbox housing, 23-reverse lead screw gear, 24-inner fixed shaft gear, 25-drive motor gear, 26-adjusting gear, 27-first adjusting rod hole. Detailed Implementation

[0055] The structure of the present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0056] Example 1

[0057] A small pipe beveling grinder, such as Figures 1-9 As shown, it includes a grinder housing, a fixture 1 for fixing pipes, a grinder, and a drive device (motor 12);

[0058] The drive unit (motor 12) and the adjusting gearbox 11 are arranged inside the grinding machine housing. The fixture 1 and the grinding device are fixed on the same side of the grinding machine housing. The control board 13 is also installed inside the grinding machine housing. The control board 13 is electrically connected to the drive unit. The control board 13 is connected to the power plug 8 located outside the grinding machine housing through the power supply line. The grinding machine housing has heat dissipation holes 9. The grinding machine housing is equipped with a closed main handle 6. A switch 7 is provided at the main handle 6. The switch 7 is electrically connected to the control board 13. The grinding machine housing is also equipped with a rod-shaped auxiliary handle 5. The gripping direction of the auxiliary handle 5 is perpendicular to that of the main handle 6.

[0059] The fixture 1 is a folding four-bar structure and the fixture 1 is centered on the reverse screw. The reverse screw is connected to the drive device through the adjusting gear box 11. The drive device drives the fixture to extend and retract through the reverse screw to fix or loosen the pipe.

[0060] The grinding device includes a grinding rotating ring 3 and a rotating groove 4. The grinding rotating ring 3 includes an outer ring 18, an inner fixed shaft 19 (the inner fixed shaft 19 is coaxial with the outer ring 18 and is a hollow shaft, with a reverse lead screw passing through the hollow part of the inner fixed shaft 19), and a rotating ring connecting strip 20 connecting the outer ring 18 and the inner fixed shaft 19. The inner fixed shaft 19 is connected to the drive device through an adjusting gear box 11 (the adjusting gear box 11 includes an adjusting gear box body 22, a reverse lead screw gear 23, an inner fixed shaft gear 24, a drive motor gear 25, and an adjusting gear 26, all of which are arranged inside the adjusting gear box body 22). The reverse lead screw gear 23 and the inner fixed shaft gear 24 are coaxial and arranged parallel to each other. The reverse lead screw gear 23 is fixed to the reverse lead screw, and the inner fixed shaft gear 24 is fixed to the inner fixed shaft 19. The external tooth structure of the reverse lead screw gear 23 and the inner fixed shaft gear 24 is the same. The drive motor gear 25 is fixedly connected to the motor drive shaft. The adjusting gear 26 is sleeved on the drive motor gear 25, and the adjusting gear 26 and the drive motor gear 25 will not rotate relative to each other. The external tooth structure of the adjusting gear 26 matches that of the reverse lead screw gear 23. The adjusting gear 26 is fixed with a gear adjusting rod 10, which allows the adjusting gear 26 to slide along the axial direction of the drive motor gear 25. It can mesh with either the reverse lead screw gear 23 or the internal fixed shaft gear 24. The gearbox housing 22 has a first adjusting rod hole 27 that matches the gear adjusting rod 10. The gear adjusting rod 10 extends out of the gearbox housing 22 from the first adjusting rod hole 27. The first adjusting rod hole 27 is strip-shaped and its arrangement direction is consistent with the sliding direction of the adjusting gear 26. The grinder housing has a second adjusting rod hole (matching the first adjusting hole 27) for the gear adjusting rod to extend out. The outer ring 18 is arranged in the rotating groove 4 and rotates freely within the rotating groove 4 (a certain gap is left between the rotating groove 4 and the outer ring 18; the rotating groove 4 is fixedly connected to the grinder housing through the rotating groove connector 21). A grinding strip 2 is fixed on the connecting strip 20 (the rotating ring connecting strip 20 has multiple grinding strip fixing holes 17 along its length direction. The grinding strip 2 includes a grinding strip grinding part 14 and a grinding strip fixing part 15 connected to each other. The grinding strip fixing part 15 matches the grinding strip fixing hole 17, and the outer wall of the end of the grinding strip fixing part 15 away from the grinding strip grinding part 14 has a retaining groove for arranging the retaining spring 16. After the grinding strip fixing part 15 passes through the grinding strip fixing hole 17, the grinding strip 2 can be fixed on the grinding strip fixing hole 17 by the retaining spring 16. The grinding surface of the grinding strip grinding part 14 is a slope). The grinding strip 2 rotates with the rotation of the inner fixed shaft 19, so that the bevel of the small pipe to be ground can be ground.

[0061] The above-mentioned method of using the small pipe beveling grinder includes the following steps:

[0062] (1) Select and install grinding strips according to the specific conditions of the pipe bevel to be ground;

[0063] (2) After placing the pipe with the bevel to be ground on the outside of the shrink-shaped fixture, adjust the gear adjusting rod to make the adjusting gear mesh with the reverse lead screw gear;

[0064] (3) Turn on the switch, and the drive device will drive the reverse screw to rotate so that the retainer extends and the retainer contacts and abuts against the inner wall of the pipe.

[0065] (4) By adjusting the gear adjusting rod to make the adjusting gear mesh with the inner fixed shaft gear, turn on the switch, the drive device drives the grinding strip to rotate, and gently push the grinding machine into the pipe to perform pipe beveling.

[0066] (5) After grinding, adjust the gear adjusting rod to make the adjusting gear mesh with the reverse screw gear, turn on the switch, and the drive device drives the reverse screw to rotate, causing the retainer to retract, and the pipe with the bevel grinding completed can be removed.

[0067] The components described in the above invention are all common structures, manufactured in parts. The grinding ring in this invention has a relatively unique structure; other parts are simple to manufacture. The grinding ring is manufactured by first producing the outer ring, then welding the grinding strip to it at the installation position. The rotating groove and grinding ring are made of metal, and the contact surface between the rotating ring and the grinding groove is as smooth as possible. The fixture also needs to be made of metal to ensure product quality. This includes shafts, gears, and adjustment boxes in the equipment, all of which must be made of common metals. A motor of approximately 1000W is sufficient. The beveling machine casing can be made of common plastic, and its size can be determined based on the size of the motor, controller, and adjustment box, minimizing its volume for ease of operation. The grinding area is designed to grind pipes up to DN300. The grinding strip needs to be manufactured at different angles according to pipe beveling specifications. The size of the fixture needs to be adapted to the grinding area.

[0068] Those skilled in the art should understand that variations can be implemented by combining existing technology with the above embodiments, which will not be elaborated here. Such variations do not affect the essence of the present invention and will not be elaborated here.

[0069] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a conventional manner in the art. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention using the methods and techniques disclosed above, or modify them into equivalent embodiments with equivalent changes, without departing from the scope of the present invention. This does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the present invention's technical solutions still fall within the protection scope of the present invention.

Claims

1. A small pipe beveling grinder, characterized in that: Includes clamps, grinding devices, and drive devices for fixing pipes; The fixture is a folding four-bar structure with a reverse screw as the central axis. The reverse screw is connected to the drive device, and the drive device drives the fixture to extend and retract through the reverse screw to fix or loosen the pipe. The grinding device includes a grinding rotating ring and a rotating groove. The grinding rotating ring includes an outer ring, an inner fixed shaft, and a rotating ring connecting strip connecting the outer ring and the inner fixed shaft. The inner fixed shaft is connected to a drive device. The outer ring is arranged in the rotating groove and can rotate freely in the rotating groove. A grinding strip is fixed on the rotating ring connecting strip. The grinding strip rotates with the rotation of the inner fixed shaft, thereby grinding the bevel of the small pipe to be ground. The drive device is a motor. The drive device is connected to the reverse lead screw and the inner fixed shaft respectively through the adjusting gearbox; The inner fixed shaft is coaxial with the outer ring; The inner fixed shaft is a hollow shaft, and the reverse lead screw passes through the hollow part of the inner fixed shaft; The adjusting gearbox includes a reverse lead screw gear, an inner fixed shaft gear, a drive motor gear, and an adjusting gear. The reverse lead screw gear and the inner fixed shaft gear are coaxial and arranged in parallel. The reverse lead screw gear is fixed to the reverse lead screw, and the inner fixed shaft gear is fixed to the inner fixed shaft. The external tooth structure of the reverse lead screw gear and the inner fixed shaft gear is the same. The drive motor gear is fixedly connected to the motor drive shaft. The adjusting gear is sleeved on the drive motor gear and the adjusting gear and the drive motor gear will not rotate relative to each other. The external teeth of the adjusting gear are matched with the external teeth of the reverse lead screw gear. The adjusting gear is fixed with a gear adjusting rod. The adjusting gear can be slid along the axial direction of the drive motor gear through the gear adjusting rod to mesh with the reverse lead screw gear or the internal fixed shaft gear respectively.

2. The small pipe beveling grinder according to claim 1, characterized in that, The reverse lead screw gear, the internal fixed shaft gear, the drive motor gear, and the adjusting gear are all arranged inside the adjusting gearbox housing. The gearbox housing has a first adjusting rod hole that matches the gear adjusting rod. The gear adjusting rod extends out of the gearbox housing from the first adjusting rod hole. The first adjusting rod hole is strip-shaped and its arrangement direction is consistent with the sliding direction of the adjusting gear.

3. The small pipe beveling grinder according to claim 1, characterized in that, A certain gap is left between the rotating groove and the outer ring, and the rotating groove is fixedly connected to the grinding machine housing through a rotating groove connector.

4. A small pipe beveling grinder according to claim 1, characterized in that, The rotating ring connecting strip has multiple grinding strip fixing holes along its length.

5. A small pipe beveling grinder according to claim 4, characterized in that, The grinding strip includes a grinding part and a grinding strip fixing part that are connected to each other; The grinding strip fixing part matches the grinding strip fixing hole, and the outer wall of the grinding strip fixing part away from the grinding part end of the grinding strip has a retaining spring groove for arranging retaining springs. After the grinding strip fixing part passes through the grinding strip fixing hole, the grinding strip can be fixed on the grinding strip fixing hole by using a retaining spring.

6. A small pipe beveling grinder according to claim 5, characterized in that, The grinding surface of the grinding section of the grinding strip is a slope.

7. A small pipe beveling grinder according to claim 1, characterized in that, It also includes the grinder housing; The drive unit and adjusting gearbox are arranged inside the grinding machine housing, and the fixture and grinding device are fixed on the same side of the grinding machine housing. The grinding machine housing is also equipped with a control board, which is electrically connected to the drive device. The control board is connected to a power plug located outside the grinding machine housing via a power supply line. The grinding machine housing has heat dissipation holes and a second adjustment rod hole for the gear adjustment rod to extend out. The grinding machine housing is equipped with a closed main handle, and a switch is located on the main handle. The switch is electrically connected to the control board. The grinding machine housing is also equipped with a rod-shaped auxiliary handle, which is perpendicular to the gripping direction of the main handle.

8. The method of using a small pipe beveling grinder as described in any one of claims 1 to 7, characterized in that, Includes the following steps: (1) Select and install grinding strips according to the specific conditions of the pipe bevel to be ground; (2) After placing the pipe with the bevel to be ground on the outside of the shrink-shaped fixture, adjust the gear adjusting rod to make the adjusting gear mesh with the reverse lead screw gear; (3) Turn on the switch, and the drive device drives the reverse screw to rotate so that the retainer extends and the retainer contacts and abuts against the inner wall of the pipe; (4) By adjusting the gear adjusting rod to make the adjusting gear mesh with the inner fixed shaft gear, turn on the switch, the drive device drives the grinding strip to rotate, and gently push the grinding machine into the pipe to perform pipe beveling; (5) After grinding, adjust the gear adjusting rod to make the adjusting gear mesh with the reverse screw gear, turn on the switch, and the drive device drives the reverse screw to rotate, causing the retainer to retract, and the pipe with the bevel grinding completed can be removed.

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