A handheld pipe cutting device

Abstract

A handheld pipe cutting device. The pipe cutting device comprises a gripping part and a cutting part; the gripping part comprises a shell and a motor arranged in the shell; the cutting part comprises: a base plate connected to the shell, which has a circular hole penetrating the middle of the base plate and a first notch opened at the periphery of the circular hole and communicating with the circular hole for the pipe to pass through; a rotating ring rotatably embedded in the circular hole of the base plate, which has a second notch opened in the radial direction for the pipe to pass through; a transmission mechanism installed on the base plate and connected to the rotating ring and the motor respectively; the clamp is used to clamp the pipe inserted in the rotating ring in a closed state, and to allow the pipe to pass through in an open state; the cutting piece is connected to the rotating ring, and is used to cut the pipe inserted in the rotating ring when it rotates synchronously with the rotating ring. The pipe cutting device has the advantages of convenient operation, high cutting efficiency, wide application, high safety factor, and burr-free cutting.

Description

Technical Field

[0001] The invention relates to the technical field of cutting equipment, specifically to pipe cutting equipment, and more specifically to a handheld pipe cutting device. Background Art

[0002] Thin-walled stainless steel pipes have been gradually promoted and used in a large area in China. During the processing or use of thin-walled stainless steel pipes, in order to make their length meet the specified requirements, cutting devices are required to cut them.

[0003] At present, the commonly used steel pipe cutting device in the industry only includes a simple cutting machine. When using this device, the staff needs to use auxiliary tools to fix the steel pipe, and then manually operate the cutting machine to cut the steel pipe. The cutting process also requires manual rotation of the steel pipe. This cutting method requires more manual participation, low cutting efficiency, and potential safety hazards. In addition, the flatness of the cross section of the steel pipe after cutting is poor.

[0004] In order to improve cutting efficiency and safety, a large-scale automatic steel pipe cutting machine appeared in the industry. At that time, this type of large-scale steel pipe cutting machine was too complex in structure, occupied a large area, and had high costs, making it unsuitable for promotion. The most important thing is that this type of large-scale steel pipe cutting machine is only suitable for cutting pipes in the process of processing, and it is almost impossible to cut pipes that have been put into use (for example, pipes that have been installed on the wall or arranged at high altitude). Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a handheld pipe cutting device which is easy to operate, has high cutting efficiency, is widely applicable, has a high safety factor, and can cut without burrs.

[0006] In order to solve the above technical problems, the technical solution adopted by the invention is to provide a handheld pipe cutting device, the pipe cutting device includes a gripping part and a cutting part; the gripping part includes a shell and a motor arranged in the shell; the cutting part includes a base plate, a rotating ring, a clamp, a cutting piece and a transmission mechanism; the base plate is connected to the shell, and has a circular hole penetrating the middle of the base plate and a first notch opened on the periphery of the circular hole and communicating with the circular hole for the pipe to pass through; the rotating ring is rotatably embedded in the circular hole of the base plate, and has a second notch opened in the radial direction for the pipe to pass through; the transmission mechanism is installed on the base plate and is respectively connected to the rotating ring and the motor, so that the motor can drive the rotating ring to rotate in the circular hole; the clamp is used to clamp the pipe inserted in the rotating ring in the closed state, and to allow the pipe to pass through in the open state; the cutting piece is connected to the rotating ring, and is used to cut the pipe inserted in the rotating ring when it rotates synchronously with the rotating ring.

[0007] When the pipe cutting device of the above technical solution is used to cut the pipe, the rotating ring can be rotated to a position where the second notch is aligned with the first notch, and at the same time, the clamp is adjusted to an open state. At this time, the pipe can be directly inserted radially into the rotating ring through the first notch and the second notch. In this way, when cutting the pipe, the pipe cutting device does not need to be inserted from the end of the pipe and then moved to the position where cutting is required, but the first notch and the second notch can be directly aligned with the position where cutting is required and then the pipe cutting device can be moved radially along the rotating ring to allow the pipe to enter the rotating ring. When the pipe is completely entered into the rotating ring, the clamp is adjusted to a closed state to clamp the pipe in the rotating ring. Then the motor is turned on to drive the rotating ring to rotate, and the cutting member that rotates synchronously with the rotating ring can cut the pipe in the rotating ring. It can be seen that, since the pipe cutting device does not need to be inserted from the end of the pipe and then moved to the position where cutting is required, the pipe cutting device can efficiently cut the pipes that have been put into use, especially the pipes that are fixedly connected to the wall at both ends. Moreover, during the cutting process, the clamp pre-clamps the pipe and cooperates with the cutting piece to perform ring cutting, which can ensure that the cut end is more neat and burr-free.

[0008] As an improvement of the handheld pipe cutting device provided by the present invention, the clamp includes a fixed half ring and a movable half ring arranged on the same side of the rotating ring, the fixed half ring is fixedly connected to the rotating ring, and one end of the movable half ring is rotatably connected to the rotating ring; when the clamp is in a closed state, the other end of the movable half ring abuts against the fixed half ring; the pipe cutting device also includes a first retainer for keeping the clamp in a closed state. Through the above improvements, during the process of the pipe cutting device cutting the pipe, the fixed half ring and the movable half ring jointly clamp the pipe in the rotating ring under the action of the first retainer.

[0009] As an improvement of the handheld pipe cutting device provided by the present invention, the first retainer is a V-shaped leaf spring, and the two elastic arms of the V-shaped leaf spring are respectively connected to the fixed half ring and the movable half ring; when the clamp is in a closed state, the V-shaped leaf spring is in a tensioned state. Through the above improvement, when the clamp is in a closed state, since the V-shaped leaf spring is in a tensioned state, the V-shaped leaf spring applies a force to the fixed half ring and the movable half ring to move closer to each other through the two elastic arms.

[0010] As an improvement of the handheld pipe cutting device provided by the present invention, when the clamp is in an open state, the other end of the movable half ring is separated from the fixed half ring and a gap is formed between the movable half ring and the fixed half ring for the pipe to pass through; the pipe cutting device also includes a second retainer for keeping the clamp in an open state. Through the above improvement, in the process of putting the pipe cutting device on the outside of the pipe along the radial direction of the rotating ring, the retainer can be kept in an open state by the second retainer to ensure that the pipe enters the rotating ring smoothly.

[0011] As an improvement of the handheld pipe cutting device provided by the present invention, the outer side surface of the movable semi-ring is provided with a groove; the second retainer includes a connected hook plate and a tension spring, and the hook plate and the tension spring are both installed on the side of the base plate where the clamp is located; one end of the tension spring is fixed to the base plate, the middle part of the hook plate is rotatably connected to the base plate, one end of the hook plate is provided with a barb, and the other opposite end is connected to the other end of the tension spring; under the action of the tension spring, the barb of the hook plate is pressed against the outer side surface of the movable semi-ring; when the clamp is in an open state, the barb of the hook plate is stuck in the groove.

[0012] Through the above improvement, when the pipe cutting device is used, the motor can be started to rotate forward to drive the rotating ring to rotate forward, and the fixed half ring and the movable half ring rotate forward with the rotating ring at the same time, so that the groove of the movable half ring gradually approaches the barb until the barb is buckled into the groove, and the motor is turned off. Then the motor is started to rotate reversely to drive the rotating ring to rotate in the opposite direction. At this time, the fixed half ring will rotate in the opposite direction with the rotating ring, and the movable half ring will not rotate synchronously with the rotating ring because it is hooked by the barb, so that the fixed half ring and the movable half ring move relative to each other, and the movable half ring and the fixed half ring gradually separate until the gap between the movable half ring and the fixed half ring allows the pipe to pass through, and the motor is turned off. In this way, the retainer is adjusted from a closed state to an open state through electrical control throughout the process, and can be maintained in the open state.

[0013] As an improvement of the handheld pipe cutting device provided by the present invention, the groove has a relative stop surface and an arc guide surface; when the barb is buckled into the groove, the inner side surface of the barb abuts against the stop surface, and the outer side surface of the barb is opposite to the arc guide surface. Through the above improvement, when the clamp in the open state needs to be adjusted to the closed state, the motor can be started to rotate forward to drive the rotating ring to rotate forward. At this time, the fixed half ring will rotate forward synchronously with the rotating ring, and the movable half ring is connected to the rotating ring in rotation, and the force applied by the leaf spring to rotate the movable half ring toward the fixed half ring, and during the process of the rotating ring rotating forward, it will swing toward the fixed half ring under the action of the leaf spring. The most critical point is that when the movable half ring rotates forward relative to the barb, since the outer side of the barb is opposite to the circular arc guide surface, and the hook hanging piece is rotatably connected to the base plate, during the process of the movable half ring rotating forward relative to the barb, when the barb contacts the circular arc guide surface, the barb will slide out of the groove under the guidance of the circular arc guide surface without hindering the forward rotation of the movable half ring. In this way, the movable half ring can abut against the fixed half ring again under the action of the leaf spring, thereby clamping the pipe entering the rotating ring. In this way, the retainer can be adjusted from an open state to a closed state by means of electrical control, and it is ensured that the second retainer will not hinder the forward rotation of the retainer, thereby ensuring that the rotating ring can smoothly rotate forward to complete the subsequent cutting action.

[0014] As an improvement of the handheld pipe cutting device provided by the present invention, the transmission mechanism includes a first driving wheel and a second driving wheel rotatably mounted on the base plate; when the second notch on the rotating ring is aligned with the first notch on the base plate, the first driving wheel and the second driving wheel are both in contact with the peripheral side surface of the rotating ring; when the rotating ring rotates, at least one of the first driving wheel and the second driving wheel is in contact with the peripheral side surface of the rotating ring. Through the above improvement, since at least one of the first driving wheel and the second driving wheel is in contact with the peripheral side surface of the rotating ring when the rotating ring rotates, it can be ensured that the rotating ring has sufficient power when it rotates.

[0015] As an improvement of the handheld pipe cutting device provided by the present invention, the transmission mechanism also includes: a first gear mounted on the first driving wheel and coaxial with the first driving wheel, a second gear mounted on the second driving wheel and coaxial with the second driving wheel, a gear set meshing with the first gear and the second gear respectively, a worm gear connected to the gear set, and a worm connected to the output shaft of the motor and meshing with the worm gear. Through the above improvement, the first gear and the second gear are independently arranged in parallel, and a problem with either one will not cause the other to be implicated, thereby improving the stability and reliability of the pipe cutting device.

[0016] As an improvement of the handheld pipe cutting device provided by the present invention, the base plate has a relative upper side and lower side; the peripheral side surface of the rotating ring has an annular limiting groove formed by radial inward concave and a flange formed by radial protrusion; the upper side surface of the base plate is provided with an arc-shaped limiting piece, and the arc-shaped limiting piece is movably embedded in the annular limiting groove; the flange is located on the lower side of the base plate and fits with the lower side surface of the base plate. Through the above improvements, through the cooperation of the arc-shaped limiting piece and the annular limiting groove and the cooperation of the flange and the lower side surface of the base plate, it is ensured that the rotating ring always remains in a vertical plane during the rotation process, thereby ensuring a good cutting effect.

[0017] As an improvement of the handheld pipe cutting device provided by the present invention, the circumferential side surface of the rotating ring has an annular receiving groove formed by radial inward concave, and a plurality of bearing rollers are arranged in the annular receiving groove, and the plurality of bearing rollers are respectively in contact with the inner side of the circular hole of the base plate. Through the above improvement, the rotating ring can rotate more smoothly in the circular hole of the base plate.

[0018] The implementation of the pipe cutting device of the present invention can at least achieve the following beneficial effects: since the pipe cutting device does not need to be inserted from the end of the pipe and then moved to the position where cutting is required when cutting the pipe, the pipe cutting device can efficiently cut the pipes that have been put into use, especially the pipes that are fixedly connected to the wall at both ends. Moreover, during the cutting process, the clamp pre-clamps the pipe and cooperates with the cutting piece to perform ring cutting, which can ensure that the cut end is more neat and burr-free. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work:

[0020] Figure 1 A schematic top view of the pipe cutting device provided in this embodiment;

[0021] Figure 2 A schematic diagram of the three-dimensional structure of the rotating ring in the pipe cutting device provided in this embodiment;

[0022] Figure 3 A schematic diagram of the combination of a rotating ring and a base plate in the pipe cutting device provided in this embodiment;

[0023] Figure 4 A schematic diagram of a three-dimensional assembly of some components of the pipe cutting device provided for this embodiment;

[0024] Figure 5 A partially enlarged schematic diagram of the pipe cutting device provided in this embodiment (I);

[0025] Figure 6 A partially enlarged schematic diagram of the pipe cutting device provided in this embodiment (II);

[0026] Figure 7 A three-dimensional schematic diagram of a movable half ring in the pipe cutting device provided in this embodiment;

[0027] Figure 8 A bottom view schematic diagram of the pipe cutting device provided in this embodiment;

[0028] Fig. 9 This is a reference diagram of the use status of the pipe cutting device provided in this embodiment.

[0029] Description of the accompanying drawings in the specific implementation manner:

[0030]

[0031] DETAILED DESCRIPTION

[0032] In order to facilitate understanding of the invention, the invention will be described more fully below with reference to the relevant drawings. Typical embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the invention more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the invention belongs. The terms used in the specification of the invention herein are only for the purpose of describing specific embodiments and are not intended to limit the invention.

[0034] This embodiment provides a handheld pipe cutting device. Figure 1 , Figure 1 A schematic top view of the pipe cutting device provided in this embodiment. The pipe cutting device comprises a gripping portion 1 and a cutting portion 2. The gripping portion 1 comprises a housing 11 and a motor 12 disposed in the housing 11, the housing 11 being cylindrical, the motor 12 being fixed in the housing 11, and the output shaft of the motor 12 passing through the front end face of the housing. The cutting portion 2 comprises a base plate 21, a rotating ring 22, a clamp 23, a cutting member 24 and a transmission mechanism 25.

[0035] It should be noted that in Figure 1 In the paper, the direction from the outside to the inside is the downward direction. Figure 1 As can be seen in the figure, the substrate 21 is installed at the front end of the housing 11, and the substrate 21 is located below the output shaft of the motor 12. The substrate 21 has a circular hole penetrating the middle of the substrate 21 and a first notch 211 opened at the periphery of the circular hole and communicating with the circular hole for the pipe 3 to pass through.

[0036] See also Figure 2 , Figure 2 The three-dimensional structure diagram of the rotating ring 22 in the pipe cutting device provided in this embodiment. Figure 2 As shown, the rotating ring 22 is roughly annular, with a through circular receiving hole 221 in the middle, and a second notch 226 radially opened on the outside of the circular receiving hole 221 for the pipe 3 to pass through. The peripheral side surface of the rotating ring 22 has an annular receiving groove 222 and an annular limiting groove 223 formed by radial inward concave, and a plurality of self-rotating bearing rollers 224 are arranged in the annular receiving groove 222. In addition, the peripheral side surface of the rotating ring 22 also has a flange 225 formed by radial protrusion. The rotating ring 22 is rotatably embedded in the circular hole of the substrate 21. For details, please refer to Figure 3 , Figure 3 A schematic diagram of the combination of the rotating ring 22 and the base plate 21 in the pipe cutting device provided in this embodiment. The base plate 21 has an upper side surface and a lower side surface opposite to each other, the annular positioning groove 222 of the rotating ring 22 is flush with the base plate 21, and the annular limiting groove 223 and the flange 225 are respectively located on the upper side and the lower side of the base plate 21. Figure 3It can be seen that two arc-shaped limit pieces 212 are provided on the upper side of the substrate 21, and both arc-shaped limit pieces 212 are movably embedded in the annular limit groove 223 of the rotating ring 22. At the same time, the flange 225 is in contact with the lower side of the substrate 21. The multiple bearing rollers 224 in the annular groove 222 are in contact with the inner side of the circular hole of the substrate 21 respectively. In this way, through the cooperation between the arc-shaped limit piece 212 and the annular limit groove 223 and the cooperation between the flange 225 and the lower side of the substrate 21, it is ensured that the rotating ring 22 always remains in a vertical plane during the rotation process. In addition, the provision of the bearing rollers 224 allows the rotating ring 22 to rotate more smoothly in the circular hole of the substrate 21.

[0037] The transmission mechanism 25 is mounted on the base plate 21 and is connected to the rotating ring 22 and the motor 12 respectively, so that the motor 12 can drive the rotating ring 22 to rotate in the circular hole. Figure 1 and Figure 4 , Figure 4 A schematic diagram of a three-dimensional combination of some components of the pipe cutting device provided in this embodiment. Figure 4 The arc-shaped limit plate 212 provided on the base plate 21 is omitted. The transmission mechanism 25 includes a first driving wheel 251 and a second driving wheel 252 rotatably mounted on the base plate 21, a first gear 253 mounted on the first driving wheel 251 and coaxial with the first driving wheel 251, a second gear 254 mounted on the second driving wheel 252 and coaxial with the second driving wheel 252, a gear set meshing with the first gear 253 and the second gear 254 respectively, a worm gear 255 connected to the gear set, and a worm 256 connected to the output shaft of the motor 12 and meshing with the worm gear 255. Figure 3 and Figure 4It can be seen that the gear set includes a first transmission gear 2571, a second transmission gear 2572, a third transmission gear 2573, a fourth transmission gear 2574 and a fifth transmission gear 2575 which are rotatably mounted on the upper side of the base plate 21. The worm gear 255 is fixed on the first transmission gear 2571 and is coaxial with the first transmission gear 2571. The first transmission gear 2571 is meshed with the first gear 253, the second transmission gear 2572 is meshed with the first transmission gear 2571, the third transmission gear 2573 is meshed with the second transmission gear 2572, and the fourth transmission gear 2574 is meshed with the third transmission gear 2573 and the second gear 254 respectively. In this way, when the motor 12 rotates, the first driving wheel 251 and the second driving wheel 252 can be driven to rotate at the same time. In addition, when the second notch 226 on the rotating ring 22 is aligned with the first notch 211 on the base plate 21, the first driving wheel 251 and the second driving wheel 252 are both in contact with the peripheral side surface of the rotating ring 22. In this way, the first driving wheel 251 and the second driving wheel 252 can drive the rotating ring 22 to rotate when they rotate. Moreover, since the first gear 253 and the second gear 254 are independently arranged in parallel, any problem of either one will not cause the other to be implicated, thereby improving the stability and reliability of the pipe cutting device. In addition, it should be understood that by reasonably designing the opening span of the second notch 226 of the rotating ring 22 and the interval between the first driving wheel 251 and the second driving wheel 252, when the rotating ring 22 rotates, at least one of the first driving wheel 251 and the second driving wheel 252 can be in contact with the peripheral side surface of the rotating ring 22, thereby ensuring that the rotating ring 22 has sufficient power when rotating.

[0038] The clamp 23 is used to clamp the pipe 3 inserted into the rotating ring 22 in a closed state, and allows the pipe 3 to pass through in an open state. The pipe cutting device also includes a first retainer 26 for keeping the clamp 23 in a closed state and a second retainer 27 for keeping the clamp 23 in an open state. For details, see Figure 5 , Figure 5 The partially enlarged schematic diagram of the pipe cutting device provided in this embodiment (I) shows that the clamp 23 is in a closed state. Figure 5 In the paper, the direction from the inside of the paper to the outside of the paper is the downward direction. Figure 5 As can be seen in the figure, the clamp 23 is installed on the lower side of the rotating ring 22, and includes a fixed half ring 231 and a movable half ring 232 arranged on the same side of the rotating ring 22. The fixed half ring 231 is fixedly connected to the rotating ring 22, and one end of the movable half ring 232 is rotatably connected to the rotating ring 22. Figure 5In the embodiment, the clamp 23 is in a closed state. It can be seen that when the clamp 23 is in a closed state, the other end of the movable half ring 232 abuts against the fixed half ring 231. Figure 5 As shown, the first retainer 26 is a V-shaped leaf spring, and the two elastic arms 261 of the V-shaped leaf spring are respectively connected to the fixed half ring 231 and the movable half ring 232; when the clamp 23 is in a closed state, the V-shaped leaf spring is in a tensioned state. When the clamp 23 is in a closed state, since the V-shaped leaf spring is in a tensioned state, the V-shaped leaf spring applies a force to the fixed half ring 231 and the movable half ring 232 to move closer to each other through the two elastic arms 261. In this way, the fixed half ring 231 and the movable half ring 232 jointly clamp the pipe 3 in the rotating ring 22 under the action of the V-shaped leaf spring. Figure 6 , Figure 6 A partial enlarged schematic diagram of the pipe cutting device provided in this embodiment (II), in which the clamp 23 is in an open state. Figure 6 As can be seen in the figure, when the clamp 23 is in the open state, the other end of the movable half ring 232 is separated from the fixed half ring 231 and a gap is formed between the movable half ring 232 and the fixed half ring 231 for the pipe 3 to pass through. Figure 6 As shown, the second retainer 27 includes a hook piece 271 and a tension spring 272 connected to each other, and the hook piece 271 and the tension spring 272 are both installed on the lower side of the base plate 21; one end of the tension spring 272 is fixed to the base plate 21, and the middle part of the hook piece 271 is rotatably connected to the base plate 21, and one end of the hook piece 271 is provided with a barb 2711, and the other end opposite to the hook piece 271 is connected to the other end of the tension spring 272; under the action of the tension spring 272, the barb 2711 of the hook piece 271 is pressed against the outer side surface of the movable semi-ring 232 (see Figure 5 ). At the same time, a groove 2321 is provided on the outer side of the movable half ring 232. When the clamp 23 is in the open state, the barb 2711 of the hook hanging piece 271 is inserted into the groove 2321. When the pipe cutting device is used, the motor 12 can be started to rotate forward to drive the rotating ring 22 to rotate forward ( Figure 5 The fixed half ring 231 and the movable half ring 232 rotate in the positive direction with the rotating ring 22 at the same time, so that the groove 2321 of the movable half ring 232 gradually approaches the barb 2711, until the barb 2711 is buckled into the groove 2321, and the motor 12 is turned off. Then the motor 12 is started to reverse to drive the rotating ring 22 to rotate in the opposite direction ( Figure 6In the direction indicated by the arc arrow in the middle), at this time, the fixed half ring 231 will rotate in the opposite direction with the rotating ring 22, while the movable half ring 232 will not rotate synchronously with the rotating ring 22 due to being hooked by the barb 2711, so that the fixed half ring 231 and the movable half ring 232 move relative to each other, and the movable half ring 232 and the fixed half ring 231 gradually separate until the gap between the movable half ring 232 and the fixed half ring 231 allows the pipe 3 to pass through, and the motor 12 is turned off. In this way, the retainer is adjusted from the closed state to the open state through electrical control throughout the process, and can be maintained in the open state. See Figure 7 , Figure 7 A three-dimensional schematic diagram of the movable half ring 232 in the pipe cutting device provided in this embodiment. Figure 7 It can be seen that the groove 2321 on the side surface of the movable semi-ring 232 has a relative stop surface 2321a and an arc guide surface 2321b. Here, when the barb 2711 is buckled into the groove 2321, the inner side surface of the barb 2711 abuts against the stop surface 2321a, and the outer side surface of the barb 2711 is opposite to the arc guide surface 2321b. When the clamp 23 in the open state needs to be adjusted to the closed state, the motor 12 can be started to rotate forward to drive the rotating ring 22 to rotate forward. At this time, the fixed semi-ring 231 will rotate forward synchronously with the rotating ring 22, and the movable semi-ring 232 is connected to the rotating ring 22 in rotation, and the force exerted by the leaf spring to rotate the movable semi-ring 232 toward the fixed semi-ring 231, and during the process of the rotating ring 22 rotating forward, it will swing toward the fixed semi-ring 231 under the action of the leaf spring. The most important thing is that when the movable half ring 232 rotates forward relative to the barb 2711, since the outer side of the barb 2711 is opposite to the arc guide surface 2321b, and the hook hanging piece 271 is rotatably connected to the base plate 21, during the process of the movable half ring 232 rotating forward relative to the barb 2711, when the barb 2711 contacts the arc guide surface 2321b, the barb 2711 will slide out of the groove 2321 under the guidance of the arc guide surface 2321b and will not hinder the forward rotation of the movable half ring 232. In this way, the movable half ring 232 can abut against the fixed half ring 231 again under the action of the leaf spring, thereby clamping the pipe 3 entering the rotating ring 22. In this way, the retainer can be adjusted from an open state to a closed state by means of electrical control, and it is ensured that the second retainer 27 does not hinder the forward rotation of the retainer, thereby ensuring that the rotating ring 22 can smoothly rotate in the forward direction to complete the subsequent cutting action.

[0039] The cutting member 24 is connected to the rotating ring 22 and is used to cut the pipe 3 inserted into the rotating ring 22 when the rotating ring 22 rotates synchronously with the rotating ring 22. Figure 8 , Figure 8 This is a bottom view of the pipe cutting device provided in this embodiment. Figure 8 In the diagram, the direction from the inside of the paper to the outside of the paper is the downward direction. Figure 8 As shown, the cutting member 24 is not directly mounted on the rotating ring 22, but is mounted on the lower side of the fixed half ring 231 of the clamp 23. It can be understood that when the motor 12 drives the rotating ring 22 to rotate, the fixed half ring 231 of the clamp 23 will rotate synchronously therewith, thereby driving the cutting member 24 to rotate synchronously with the fixed half ring 231. The cutter head 241 of the cutting member 24 faces the inner side of the clamp 23. When the pipe 3 is clamped in the clamp 23, the cutter head 241 of the cutting member 24 will press against the pipe 3, so that the cutting member 24 cuts the pipe 3 when rotating with the rotating ring 22. It should be pointed out that in this embodiment, due to the existence of the second retainer 27, the retainer will not be obstructed only when the retainer rotates in the forward direction. Therefore, in order to ensure that the cutting member 24 can smoothly cut the pipe 3, the motor 12 should be controlled to rotate forward to drive the rotating ring 22 to rotate forward, thereby driving the cutting member 24 to rotate forward and completing the action of cutting the pipe 3.

[0040] In summary, when the pipe cutting device is used to cut the pipe 3, the rotating ring 22 can be rotated to a position where the second notch 226 is aligned with the first notch 211, and at the same time, the clamp 23 is adjusted to an open state (see Figure 5 ). At this time, the pipe 3 can be directly inserted radially into the rotating ring 22 through the first notch 211 and the second notch 226. In this way, when cutting the pipe 3, the pipe cutting device does not need to be inserted from the end of the pipe 3 and then moved to the position where cutting is required, but the first notch 211 and the second notch 226 can be directly aligned with the position where cutting is required and then the pipe cutting device can be moved radially along the rotating ring 22 to allow the pipe 3 to enter the rotating ring 22. When the pipe 3 is completely entered into the rotating ring 22, the clamp 23 is adjusted to a closed state to clamp the pipe 3 in the rotating ring 22 (see Fig. 9 , Fig. 9The use status of the pipe cutting device provided in this embodiment is shown in the reference figure). Then, the motor 12 is turned on to drive the rotating ring 22 to rotate in the forward direction, and the cutting piece 24 that rotates synchronously with the rotating ring 22 can cut the pipe 3 in the rotating ring 22. It can be seen that since the pipe cutting device does not need to be inserted from the end of the pipe 3 and then moved to the position where cutting is required when cutting the pipe 3, the pipe cutting device can efficiently cut the pipe 3 that has been put into use, especially the pipe 3 that is fixedly connected to the wall at both ends. Moreover, during the cutting process, the clamp 23 pre-clamps the pipe 3, and cooperates with the cutting piece 24 to perform ring cutting, which can ensure that the cut end is more neat and free of burrs.

[0041] The embodiments of the invention are described above in conjunction with the accompanying drawings, but the invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the inspiration of the invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the invention and the claims, all of which are within the protection of the invention.

Claims

1. A handheld pipe cutting device, characterized in that: The pipe cutting device comprises a holding portion (1) and a cutting portion (2); the holding portion (1) comprises a housing (11) and a motor (12) arranged in the housing (11); the cutting portion (2) comprises a base plate (21), a rotating ring (22), a clamp (23), a cutting piece (24) and a transmission mechanism (25); the base plate (21) is connected to the housing (11), and has a circular hole penetrating the middle of the base plate (21) and a first notch (211) opened at the periphery of the circular hole and communicating with the circular hole for allowing the pipe to pass through; the rotating ring (22) is rotatably embedded in the base plate (21). The circular hole has a second notch (226) radially provided therein for allowing the pipe to pass through; the transmission mechanism (25) is mounted on the base plate (21) and is respectively connected to the rotating ring (22) and the motor (12), so that the motor (12) can drive the rotating ring (22) to rotate in the circular hole; the clamp (23) is used to clamp the pipe inserted into the rotating ring (22) in a closed state, and to allow the pipe to pass through in an open state; the cutting member (24) is connected to the rotating ring (22), and is used to cut the pipe inserted into the rotating ring (22) when rotating synchronously with the rotating ring (22); The transmission mechanism (25) comprises a first driving wheel (251) and a second driving wheel (252) rotatably mounted on the base plate (21); when the second notch (226) on the rotating ring (22) is aligned with the first notch (211) on the base plate (21), the first driving wheel (251) and the second driving wheel (252) both abut against the peripheral side surface of the rotating ring (22); when the rotating ring (22) rotates, at least one of the first driving wheel (251) and the second driving wheel (252) abuts against the peripheral side surface of the rotating ring (22); The transmission mechanism (25) further comprises: a first gear (253) mounted on the first driving wheel (251) and coaxial with the first driving wheel (251), a second gear (254) mounted on the second driving wheel (252) and coaxial with the second driving wheel (252), a gear set meshing with the first gear (253) and the second gear (254), respectively, a worm gear (255) connected to the gear set, and a worm (256) connected to the output shaft of the motor (12) and meshing with the worm gear (255); The peripheral side surface of the rotating ring (22) has an annular receiving groove (222) formed by radial inward concave, and a plurality of bearing rollers (224) are arranged in the annular receiving groove (222). The plurality of bearing rollers (224) are respectively in contact with the inner side of the circular hole of the base plate (21).

2. The handheld pipe cutting device according to claim 1, characterized in that: The clamp (23) comprises a fixed half ring (231) and a movable half ring (232) which are arranged on the same side of the rotating ring (22); the fixed half ring (231) is fixedly connected to the rotating ring (22), and one end of the movable half ring (232) is rotatably connected to the rotating ring (22); when the clamp (23) is in a closed state, the other end of the movable half ring (232) abuts against the fixed half ring (231); the pipe cutting device also comprises a first retainer (26) for keeping the clamp (23) in a closed state.

3. The handheld pipe cutting device according to claim 2, characterized in that: The first retainer (26) is a V-shaped leaf spring, and the two elastic arms (261) of the V-shaped leaf spring are respectively connected to the fixed half ring (231) and the movable half ring (232); when the clamp (23) is in a closed state, the V-shaped leaf spring is in a tensioned state.

4. The handheld pipe cutting device according to claim 2, characterized in that: When the clamp (23) is in an open state, the other end of the movable half ring (232) is separated from the fixed half ring (231) and a gap is formed between the movable half ring (232) and the fixed half ring (231) for the pipe to pass through; the pipe cutting device also includes a second retainer (27) for keeping the clamp (23) in an open state.

5. The hand-held pipe cutting device according to claim 4, characterized in that: The outer side surface of the movable half ring (232) is provided with a groove (2321); the second retainer (27) comprises a hook piece (271) and a tension spring (272) connected to each other, and the hook piece (271) and the tension spring (272) are both installed on the side of the base plate (21) where the clamp (23) is located; one end of the tension spring (272) is fixed to the base plate (21), and the middle part of the hook piece (271) is connected to the base plate (21). Rotationally connected, one end of the hook piece (271) is provided with a barb (2711), and the other end opposite thereto is connected to the other end of the tension spring (272); under the action of the tension spring (272), the barb (2711) of the hook piece (271) is pressed against the outer side surface of the movable half ring (232); when the clamp (23) is in an open state, the barb (2711) of the hook piece (271) is stuck in the groove (2321).

6. The hand-held pipe cutting device according to claim 5, characterized in that: The groove (2321) has opposite stop surfaces (2321a) and circular arc guide surfaces (2321b); when the barb (2711) is buckled into the groove (2321), the inner side surface of the barb (2711) abuts against the stop surface (2321a), and the outer side surface of the barb (2711) is opposite to the circular arc guide surface (2321b).

7. The handheld pipe cutting device according to claim 1, characterized in that: The base plate (21) has an upper side surface and a lower side surface that are opposite to each other; the peripheral side surface of the rotating ring (22) has an annular limiting groove (223) formed by a radial inward concave shape and a flange (225) formed by a radial protrusion shape; an arc-shaped limiting piece (212) is provided on the upper side surface of the base plate (21), and the arc-shaped limiting piece (212) is movably embedded in the annular limiting groove (223); the flange (225) is located on the lower side of the base plate (21) and is in contact with the lower side surface of the base plate (21).

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