Handheld cutting saw convenient for positioning and cutting PVC (polyvinyl chloride) pipeline

Abstract

The invention relates to the technical field of cutting saws, in particular to a handheld cutting saw facilitating positioning and cutting of a PVC pipeline. According to the technical scheme, the device comprises a mounting frame, saw blades, a ring base, a motor, a mounting ring and clamping rods, the mounting ring is arranged in the ring base, the clamping rods distributed in an annular array are arranged in the mounting ring, the saw blades are arranged in the mounting frame, the motor is arranged on the inner wall of the upper end of the mounting frame, and a rotary disc is arranged at the output end of the motor; a guide frame is arranged at the upper end of the saw blade, a cam slidably mounted in the guide frame is arranged on the side of the lower end of the rotating disc, a rotating ring is rotatably mounted in the ring seat, a gear ring is arranged on the outer wall of the rotating ring, a side frame is arranged between the mounting ring and the ring seat, and a toothed plate meshed with the gear ring is arranged on the outer side of the gear ring. By arranging the two positioning structures, the problems that due to factors such as the technology of operators and the stability of equipment, the cutting position is likely to deviate, and the cutting accuracy is affected are solved.

Description

Technical Field

[0001] The invention relates to the technical field of cutting saws, and in particular to a handheld cutting saw for facilitating the positioning and cutting of PVC pipes. Background Art

[0002] PVC pipe is a plastic pipe made of polyvinyl chloride (PVC), commonly used in water supply, drainage and other fields. During installation, PVC pipe needs to be cut to the required length to meet the specific length requirements and complete pipe connection or installation. Handheld cutting saws are usually used in construction sites, maintenance, DIY projects and other occasions where PVC pipes need to be cut quickly and accurately.

[0003] However, when cutting PVC pipes, handheld saws may cause deviation, irregular cutting, rough cuts, and other problems, which affect the quality of pipe connection and construction efficiency. When using a handheld cutting saw to cut PVC pipes, due to factors such as operator skills and equipment stability, the cutting position is easily offset, affecting the accuracy of the cut. Therefore, those skilled in the art provide a handheld cutting saw that is convenient for positioning and cutting PVC pipes to solve the problems raised in the above background technology. Summary of the invention

[0004] The purpose of the present invention is to solve the problems existing in the background technology and to provide a handheld cutting saw which is convenient for positioning and cutting PVC pipes.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a handheld cutting saw for PVC pipe positioning cutting, comprising a mounting frame, a saw blade, a ring seat, a motor, a mounting ring and a clamping rod, wherein a mounting ring is arranged inside the ring seat, and clamping rods distributed in a ring array are arranged inside the mounting ring, a saw blade is arranged inside the mounting frame, a motor is arranged on the inner wall of the upper end of the mounting frame, a turntable is arranged on the output end of the motor, a guide frame is arranged on the upper end of the saw blade, a cam slidably installed inside the guide frame is arranged on the side of the lower end of the turntable, a rotating ring is rotatably installed inside the ring seat, a gear ring is arranged on the outer wall of the rotating ring, a side frame is arranged between the mounting ring and the ring seat, and a tooth plate meshing with the gear ring is arranged on the outer side of the gear ring.

[0006] Preferably, the inner wall of the rotating ring is provided with adjusting blocks distributed in a circular array, and the thickness of the inner wall of the adjusting blocks gradually increases toward one side. The adjusting blocks rotate through the rotating ring, and when passing through the clamping rod, the inner wall thickness gradually increases toward one side, thereby gradually applying a squeezing force to the clamping rod.

[0007] Preferably, the installation ring is embedded with sliding sleeves distributed in an annular array, and the insertion rod is slidably inserted into the sliding sleeves. The clamping rod is slidably supported in the installation ring through the sliding sleeves.

[0008] Preferably, the outer wall of the plug rod is sleeved with a limit ring, and the outer side of the plug rod is sleeved with a spring connected to the limit ring and the mounting ring. The limit ring elastically supports one end of the spring, so that the elastic force of the spring acts on the clamp rod.

[0009] Preferably, two balls and three balls are rotatably mounted at both ends of the plug rod. When the ball two is squeezed by the adjustment block, the wear of the pressurizing surface is reduced by the ball two, and the outer wall of the PVC pipe is rolled and fitted by the ball three to reduce the wear of the clamping surface.

[0010] Preferably, a threaded slider is disposed on the upper end of the tooth plate, a guide plate is disposed on the upper end of the ring seat, and the threaded slider is slidably mounted on the outer wall of the guide plate, and the threaded slider is threadably matched with the guide plate.

[0011] Preferably, a screw is threadedly installed inside the threaded slider, a bearing seat 1 is provided at one end of the guide plate, a bearing seat 2 is provided at the upper end of the ring seat, two ends of the screw are rotatably installed inside the bearing seat 1 and the bearing seat 2 respectively, and a torsion block is provided at one end of the screw. A rotational force is applied to the screw by grasping the torsion block, and the screw is supported by the bearing seat 1 and the bearing seat 2.

[0012] Preferably, a connecting rod is provided at the upper end of the installation frame, and a handle is provided at one end of the connecting rod. The installation frames are connected together by the connecting rod, and the installation frames can be moved conveniently by grasping the handle.

[0013] Preferably, both ends of the connecting rod are provided with slip rings, the upper end of the ring seat is provided with symmetrically distributed sliding seats, and the slip rings are slidably mounted on the outer wall of the sliding seat. The connecting rod slides on the outer wall of the sliding seat through a sliding sleeve, thereby slidably supporting the installation frame.

[0014] Preferably, a guide rail is provided inside the installation frame, a saw tooth is provided inside the installation frame, a travel groove is provided inside both ends of the saw tooth, a ball is rotatably installed inside the upper and lower ends of the travel groove, and the ball is rotatably installed inside the guide rail. The ball rolls on the inner walls at the upper and lower ends of the guide rail to guide the saw blade to slide.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention sleeves the PVC pipe through two groups of ring seats, and the ring seats are provided with clamping rods distributed in a ring array inside to clamp the outer wall of the PVC pipe at multiple points. An electrically driven saw blade is provided inside the installation frame to perform repeated linear motion to cut the outer wall of the PVC pipe. The installation frame is slidably installed on a sliding seat connected to the ring seats through a sliding sleeve. The PVC pipe is effectively positioned when being cut, effectively ensuring the stability of the pipe, avoiding displacement or shaking during the cutting process, and improving the accuracy and quality of cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main first-viewing perspective three-dimensional structure of the present invention; Figure 2 This is a schematic diagram of the main view and second viewing angle stereoscopic structure of the present invention; Figure 3 This is a schematic diagram of the main third viewing angle stereoscopic structure of the present invention; Figure 4 It is a bottom-up three-dimensional structural schematic diagram of the motor of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the ring seat of the present invention when viewed from the side in the first viewing angle; Figure 6 It is a schematic diagram of the three-dimensional structure of the ring seat of the present invention when viewed from the side in the second viewing angle; Figure 7 It is a schematic diagram of the three-dimensional structure of the ring seat of the present invention in a partial rear section.

[0017] : Illustration numerals: 1. mounting frame; 2. sliding seat; 3. sliding sleeve; 4. connecting rod; 5. grip; 6. saw blade; 7. ring seat; 8. motor; 9. turntable; 10. cam; 11. guide frame; 12. guide rail; 13. ball one; 14. travel groove; 15. bearing seat one; 16. threaded slider; 17. screw; 18. bearing seat two; 19. torsion block; 20. tooth plate; 21. guide plate; 22. mounting ring; 23. clamping rod; 24. adjusting block; 25. gear ring; 26. rotating ring; 27. side frame; 28. ball two; 29. ​​limit ring; 30. slip ring; 31. ball three; 32. spring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figures 1 to 7 , the present invention provides three embodiments:

[0020] Example 1

[0021] A handheld cutting saw for PVC pipe positioning cutting comprises a mounting frame 1, a saw blade 6, a ring seat 7, a motor 8, a mounting ring 22 and a clamping rod 23. The mounting ring 22 is arranged inside the ring seat 7, and the mounting ring 22 is provided with clamping rods 23 distributed in a ring array. The saw blade 6 is arranged inside the mounting frame 1, and the motor 8 is arranged on the inner wall of the upper end of the mounting frame 1. A turntable 9 is arranged at the output end of the motor 8. A guide frame 11 is arranged at the upper end of the saw blade 6, and a cam 10 slidably installed inside the guide frame 11 is arranged on the side of the lower end of the turntable 9. A rotating ring 26 is rotatably installed inside the ring seat 7, and a gear ring 25 is arranged on the outer wall of the rotating ring 26. A side frame 27 is arranged between the mounting ring 22 and the ring seat 7, and a tooth plate 20 meshing with the gear ring 25 is arranged on the outer side of the gear ring 25.

[0022] The inner wall of the rotating ring 26 is provided with adjusting blocks 24 distributed in a ring array, and the thickness of the inner wall of the adjusting blocks 24 gradually increases toward one side.

[0023] The motor 8 drives the turntable 9 to rotate. When the turntable 9 rotates, the cam 10 is driven to squeeze the guide frame 11. Because the saw blade 6 slides on the outer wall of the guide rail 12 through the ball bearing 13, the saw blade 6 is slidably supported. The squeezing force of the cam 10 acts on the guide frame 11, driving the saw blade 6 to rotate. When the cam 10 pushes the saw blade 6 to the limit position, the cam 10 drives the saw blade 6 to move repeatedly on the side of the turntable 9, thereby cutting the PVC pipe. The saw blade 6 driven by electricity performs repeated linear motion, which makes the cutting smooth and efficient, reduces irregular incisions and waste, and improves work efficiency. During the cutting process, the cutting end of the pipe corresponds to the position of the saw blade 6, the pipe is inserted into the ring seat 7 and the mounting ring 22, and the outer wall of the PVC pipe is clamped and fixed at multiple points in a circular array through the elastically supported clamping rods 23, thereby realizing convenient positioning of the PVC pipe. When cutting the PVC pipe, the outer wall of the PVC pipe is clamped at multiple points through the clamping rods 23 distributed in a circular array, which effectively ensures the stability of the pipe and avoids displacement or shaking during the cutting process. Since the clamping rods 23 are distributed in a circular array, the outer wall of the PVC pipe can be fully and evenly clamped, making the cutting smoother and more consistent, and avoiding deformation or damage to the pipe.

[0024] Example 2

[0025] The utility model comprises a mounting frame 1, a saw blade 6, a ring seat 7, a motor 8, a mounting ring 22 and a clamping rod 23. The mounting ring 22 is arranged inside the ring seat 7, and the mounting ring 22 is arranged inside with clamping rods 23 distributed in a ring array. The mounting frame 1 is arranged inside with a saw blade 6, and the inner wall of the upper end of the mounting frame 1 is arranged with a motor 8, and the output end of the motor 8 is arranged with a turntable 9, and the upper end of the saw blade 6 is arranged with a guide frame 11, and the lower end side of the turntable 9 is provided with a cam 10 slidably installed inside the guide frame 11, and the inner side of the ring seat 7 is provided with a rotating ring 26, and the outer wall of the rotating ring 26 is provided with a gear ring 25, and a side frame 27 is arranged between the mounting ring 22 and the ring seat 7, and the outer side of the gear ring 25 is provided with a tooth plate 20 meshing with the gear ring 25.

[0026] The inner wall of the rotating ring 26 is provided with adjusting blocks 24 distributed in a ring array, and the thickness of the inner wall of the adjusting blocks 24 gradually increases toward one side.

[0027] The motor 8 drives the turntable 9 to rotate. When the turntable 9 rotates, the cam 10 is driven to squeeze the guide frame 11. Because the saw blade 6 slides on the outer wall of the guide rail 12 through the ball bearing 13, the saw blade 6 is slidably supported. The squeezing force of the cam 10 acts on the guide frame 11, driving the saw blade 6 to rotate. When the cam 10 pushes the saw blade 6 to the limit position, the cam 10 drives the saw blade 6 to move repeatedly on the side of the turntable 9, thereby cutting the PVC pipe. The saw blade 6 driven by electricity performs repeated linear motion, which makes the cutting smooth and efficient, reduces irregular incisions and waste, and improves work efficiency. During the cutting process, the cutting end of the pipe corresponds to the position of the saw blade 6, the pipe is inserted into the ring seat 7 and the mounting ring 22, and the outer wall of the PVC pipe is clamped and fixed at multiple points in a circular array through the elastically supported clamping rods 23, thereby realizing convenient positioning of the PVC pipe. When cutting the PVC pipe, the outer wall of the PVC pipe is clamped at multiple points through the clamping rods 23 distributed in a circular array, which effectively ensures the stability of the pipe and avoids displacement or shaking during the cutting process. Since the clamping rods 23 are distributed in a circular array, the outer wall of the PVC pipe can be fully and evenly clamped, making the cutting smoother and more consistent, and avoiding deformation or damage to the pipe.

[0028] The installation ring 22 is embedded with slip rings 30 distributed in an annular array, and the clamping rod 23 is slidably inserted into the slip ring 30; The outer wall of the clamp rod 23 is sleeved with a limit ring 29, and the outer side of the clamp rod 23 is sleeved with a spring 32 connected to the limit ring 29 and the mounting ring 22; The two ends of the clamping rod 23 are rotatably mounted with a second ball 28 and a third ball 31; A threaded slider 16 is disposed at the upper end of the tooth plate 20, a guide plate 21 is disposed at the upper end of the ring seat 7, and the threaded slider 16 is slidably mounted on the outer wall of the guide plate 21; The threaded slider 16 is internally threaded with a screw 17, one end of the guide plate 21 is provided with a bearing seat 15, the upper end of the ring seat 7 is provided with a bearing seat 2 18, the two ends of the screw 17 are rotatably installed inside the bearing seat 15 and the bearing seat 2 18, and one end of the screw 17 is provided with a torsion block 19; When cutting the PVC pipe, insert the PVC pipe into the installation ring 22, then grasp the torsion block 19 to drive the screw 17 to rotate. Because the threaded slider 16 is supported by the guide plate 21, the threaded slider 16 is driven to move, and the tooth plate 20 is driven to move. Because the tooth plate 20 is meshed with the gear ring 25, the gear ring 25 is pushed, driving the installation ring 22 to rotate, and then driving the adjustment block 24 to rotate with the rotating ring 26. When the rotating ring 26 rotates, the clamping rod 23 is squeezed. The clamping rod 23 applies an extrusion force to the spring 32 through the limit ring 29. The clamping rod 23 is forced to slide inside the slip ring 30, and then moves synchronously, and the outer wall of the PVC pipe is clamped at multiple points. The clamping rod 23 moves synchronously, and the concentric spacing is adjustable, which is suitable for the clamping of PVC pipes of different specifications. The PVC pipe is effectively positioned when cutting, and the positioning structure is flexible and adjustable. By clamping the outer wall of the PVC pipe at multiple points, its stability is ensured, displacement or shaking during cutting is avoided, and the accuracy and quality of the incision are improved. The synchronous movement of the clamping rod 23 makes the clamping of the outer wall of the PVC pipe more uniform and stable, which is suitable for pipes of different specifications, provides adjustment space, and provides better positioning support during cutting.

[0029] Example 3

[0030] The utility model comprises a mounting frame 1, a saw blade 6, a ring seat 7, a motor 8, a mounting ring 22 and a clamping rod 23. The mounting ring 22 is arranged inside the ring seat 7, and the mounting ring 22 is arranged inside with clamping rods 23 distributed in a ring array. The mounting frame 1 is arranged inside with a saw blade 6, and the inner wall of the upper end of the mounting frame 1 is arranged with a motor 8, and the output end of the motor 8 is arranged with a turntable 9, and the upper end of the saw blade 6 is arranged with a guide frame 11, and the lower end side of the turntable 9 is provided with a cam 10 slidably installed inside the guide frame 11, and the inner side of the ring seat 7 is provided with a rotating ring 26, and the outer wall of the rotating ring 26 is provided with a gear ring 25, and a side frame 27 is arranged between the mounting ring 22 and the ring seat 7, and the outer side of the gear ring 25 is provided with a tooth plate 20 meshing with the gear ring 25.

[0031] The inner wall of the rotating ring 26 is provided with adjusting blocks 24 distributed in a ring array, and the thickness of the inner wall of the adjusting blocks 24 gradually increases toward one side.

[0032] The motor 8 drives the turntable 9 to rotate. When the turntable 9 rotates, the cam 10 is driven to squeeze the guide frame 11. Because the saw blade 6 slides on the outer wall of the guide rail 12 through the ball bearing 13, the saw blade 6 is slidably supported. The squeezing force of the cam 10 acts on the guide frame 11, driving the saw blade 6 to rotate. When the cam 10 pushes the saw blade 6 to the limit position, the cam 10 drives the saw blade 6 to move repeatedly on the side of the turntable 9, thereby cutting the PVC pipe. The saw blade 6 driven by electricity performs repeated linear motion, which makes the cutting smooth and efficient, reduces irregular incisions and waste, and improves work efficiency. During the cutting process, the cutting end of the pipe corresponds to the position of the saw blade 6, the pipe is inserted into the ring seat 7 and the mounting ring 22, and the outer wall of the PVC pipe is clamped and fixed at multiple points in a circular array through the elastically supported clamping rods 23, thereby realizing convenient positioning of the PVC pipe. When cutting the PVC pipe, the outer wall of the PVC pipe is clamped at multiple points through the clamping rods 23 distributed in a circular array, which effectively ensures the stability of the pipe and avoids displacement or shaking during the cutting process. Since the clamping rods 23 are distributed in a circular array, the outer wall of the PVC pipe can be fully and evenly clamped, making the cutting smoother and more consistent, and avoiding deformation or damage to the pipe.

[0033] The installation ring 22 is embedded with slip rings 30 distributed in an annular array, and the clamping rod 23 is slidably inserted into the slip ring 30; The outer wall of the clamp rod 23 is sleeved with a limit ring 29, and the outer side of the clamp rod 23 is sleeved with a spring 32 connected to the limit ring 29 and the mounting ring 22; The two ends of the clamping rod 23 are rotatably mounted with a second ball 28 and a third ball 31; A threaded slider 16 is disposed at the upper end of the tooth plate 20, a guide plate 21 is disposed at the upper end of the ring seat 7, and the threaded slider 16 is slidably mounted on the outer wall of the guide plate 21; The threaded slider 16 is internally threaded with a screw 17, one end of the guide plate 21 is provided with a bearing seat 15, the upper end of the ring seat 7 is provided with a bearing seat 2 18, the two ends of the screw 17 are rotatably installed inside the bearing seat 15 and the bearing seat 2 18, and one end of the screw 17 is provided with a torsion block 19; When cutting the PVC pipe, insert the PVC pipe into the installation ring 22, then grasp the torsion block 19 to drive the screw 17 to rotate. Because the threaded slider 16 is supported by the guide plate 21, the threaded slider 16 is driven to move, and the tooth plate 20 is driven to move. Because the tooth plate 20 is meshed with the gear ring 25, the gear ring 25 is pushed, driving the installation ring 22 to rotate, and then driving the adjustment block 24 to rotate with the rotating ring 26. When the rotating ring 26 rotates, the clamping rod 23 is squeezed. The clamping rod 23 applies an extrusion force to the spring 32 through the limit ring 29. The clamping rod 23 is forced to slide inside the slip ring 30, and then moves synchronously, and the outer wall of the PVC pipe is clamped at multiple points. The clamping rod 23 moves synchronously, and the concentric spacing is adjustable, which is suitable for the clamping of PVC pipes of different specifications. The PVC pipe is effectively positioned when cutting, and the positioning structure is flexible and adjustable. By clamping the outer wall of the PVC pipe at multiple points, its stability is ensured, displacement or shaking during cutting is avoided, and the accuracy and quality of the incision are improved. The synchronous movement of the clamping rod 23 makes the clamping of the outer wall of the PVC pipe more uniform and stable, which is suitable for pipes of different specifications, provides adjustment space, and provides better positioning support during cutting.

[0034] A connecting rod 4 is provided at the upper end of the installation frame 1, and a handle 5 is provided at one end of the connecting rod 4; Slip rings 30 are provided at both ends of the connecting rod 4, and symmetrically distributed slide seats 2 are provided at the upper end of the ring seat 7, and the slip rings 30 are slidably installed on the outer wall of the slide seat 2; A guide rail 12 is provided inside the mounting frame 1, a saw blade 6 is provided inside the mounting frame 1, a travel groove 14 is provided inside both ends of the saw blade 6, a ball bearing 13 is rotatably installed inside the upper and lower ends of the travel groove 14, and the ball bearing 13 is rollingly installed inside the guide rail 12; The gripping handle 5 is grasped to drive the connecting rod 4 to move, thereby moving the cutting assembly, and the cutting assembly slides on the outer wall of the slide seat 2 through the sliding sleeve 3 to achieve connection with the positioning structure. The positioning structure can be separated from the cutting assembly during use and can be conveniently assembled when needed. The gripping handle 5 is used to drive the connecting rod 4 to move, which is simple and convenient to operate. The use of a detachable positioning structure and cutting assembly makes it easy to assemble and disassemble when needed, thereby increasing the flexibility and adaptability of the equipment. The outer wall of the cutting assembly sliding sleeve 3 slides to achieve connection with the positioning structure and obtains a longitudinal sliding guide to ensure stability and accuracy during the cutting process. The design of the equipment enables the cutting assembly to cut along a smooth and precise moving route driven by the connecting rod 4, thereby ensuring the overall quality of the finished product. The detachable positioning structure and cutting assembly design solve the assembly and maintenance problems when cleaning or replacing parts during use. The longitudinal sliding guide design ensures that the cutting assembly maintains stable and orderly movement during the cutting process. The smooth moving route can reduce motion resistance and ensure that the cutting assembly moves at a smooth speed and trajectory during the cutting process, thereby avoiding friction that affects the cutting effect.

[0035] The above-mentioned specific embodiments are only several preferred embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above-mentioned embodiments, those skilled in the art can make various alternative improvements and combinations to the above-mentioned specific embodiments.

[0036] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A hand-held cutting saw for PVC pipe positioning and cutting, comprising a mounting frame (1), a saw blade (6), a ring seat (7), a motor (8), a mounting ring (22) and a clamping rod (23), characterized in that: A mounting ring (22) is arranged inside the ring seat (7), and clamping rods (23) distributed in a ring array are arranged inside the mounting ring (22). A saw blade (6) is arranged inside the mounting frame (1), and a motor (8) is arranged on the inner wall of the upper end of the mounting frame (1). A turntable (9) is arranged at the output end of the motor (8). A guide frame (11) is arranged at the upper end of the saw blade (6), and a cam (10) slidably mounted inside the guide frame (11) is arranged on the side of the lower end of the turntable (9). A rotating ring (26) is rotatably mounted inside the ring seat (7), and a gear ring (25) is arranged on the outer wall of the rotating ring (26). A side frame (27) is arranged between the mounting ring (22) and the ring seat (7), and a tooth plate (20) meshingly mounted therewith is arranged on the outer side of the gear ring (25).

2. A handheld cutting saw for PVC pipe positioning and cutting according to claim 1, characterized in that: The inner wall of the rotating ring (26) is provided with adjustment blocks (24) distributed in a ring array, and the thickness of the inner wall of the adjustment blocks (24) gradually increases towards one side.

3. A handheld cutting saw for PVC pipe positioning and cutting according to claim 1, characterized in that: Sliding sleeves (3) distributed in a ring array are embedded and installed inside the mounting ring (22), and the clamping rod (23) is slidably inserted inside the sliding sleeves (3).

4. A handheld cutting saw for PVC pipe positioning and cutting according to claim 1, characterized in that: The outer wall of the clamping rod (23) is sleeved with a limit ring (29), and the outer side of the clamping rod (23) is sleeved with a spring (32) connected to the limit ring (29) and the mounting ring (22).

5. The handheld cutting saw for PVC pipe positioning and cutting according to claim 1, characterized in that: The two ends of the clamping rod (23) are respectively rotatably mounted with a second ball (28) and a third ball (31).

6. The handheld cutting saw for PVC pipe positioning and cutting according to claim 1, characterized in that: A threaded slider (16) is disposed at the upper end of the toothed plate (20), a guide plate (21) is disposed at the upper end of the ring seat (7), and the threaded slider (16) is slidably mounted on the outer wall of the guide plate (21).

7. A handheld cutting saw for PVC pipe positioning and cutting according to claim 6, characterized in that: The threaded slider (16) has a screw rod (17) installed in the internal thread, a bearing seat 1 (15) is arranged at one end of the guide plate (21), a bearing seat 2 (18) is arranged at the upper end of the ring seat (7), the two ends of the screw rod (17) are rotatably installed in the bearing seat 1 (15) and the bearing seat 2 (18), respectively, and a torsion block (19) is arranged at one end of the screw rod (17).

8. The handheld cutting saw for PVC pipe positioning and cutting according to claim 1, characterized in that: A connecting rod (4) is provided at the upper end of the installation frame (1), and a handle (5) is provided at one end of the connecting rod (4).

9. A handheld cutting saw for PVC pipe positioning and cutting according to claim 8, characterized in that: Slip rings (30) are provided at both ends of the connecting rod (4), and symmetrically distributed slide seats (2) are provided at the upper end of the ring seat (7), and the slip rings (30) are slidably mounted on the outer wall of the slide seat (2).

10. The handheld cutting saw for PVC pipe positioning and cutting according to claim 1, characterized in that: A guide rail (12) is arranged inside the installation frame (1), a saw blade (6) is arranged inside the installation frame (1), travel grooves (14) are provided inside both ends of the saw blade (6), and a ball bearing (13) is rotatably installed inside the upper and lower ends of the travel groove (14), and the ball bearing (13) is rollingly installed inside the guide rail (12).

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