A pipe cutting device for manufacturing police restraint beds

Abstract

The present invention discloses a pipe cutting device for manufacturing police restraint beds, which relates to the technical field of pipe cutting devices and aims to solve the technical problem of limitations in the cutting and processing of restricted bent pipes for police restraint beds. The present invention uses a three-jaw chuck to initially clamp the pipe, and a restraint pipe fastening mechanism forms a semi-arc structure to surround the pipe to achieve double fixation. The arc motion mechanism drives the flat rail cutting mechanism to move along an arc trajectory to adapt to the curved surface of the curved pipe. The driving structure drives the rotating ring to rotate, so that the shaft rotating block rotates coaxially and drives the slider to rotate. At the same time, the slider is limited by the cross guide groove and the cross guide block to slide in the shaft rotating block slide groove, and the moving block makes the knife group move in a flat hole-shaped trajectory, thereby forming and processing the special-shaped incision required for the curved pipe in one time. This principle enables the device to efficiently and accurately adapt to the complex curved surface cutting of the police restraint bed curved pipe, avoids the errors of multiple clamping in traditional processes, improves the incision accuracy and flatness, reduces subsequent processes, and improves processing efficiency and safety.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe cutting devices, and more particularly to a pipe cutting device for manufacturing police restraint beds. Background Art

[0002] As a crucial law enforcement aid, police restraint beds require precision and performance that directly impacts both law enforcement safety and the comfort of restrained individuals. Key structural components typically include numerous restraint bends. These bends must be cut with appropriate curved grooves and elliptical holes according to design requirements to ensure precise coordination with restraint locks, adjustment mechanisms, and other components, ensuring the reliability and stability of the restraint function.

[0003] Currently, traditional cutting equipment has significant limitations when it comes to cutting the restraint bed bends. Ordinary cutting equipment struggles to meet the high-precision processing requirements for complex curved grooves and elliptical holes in bends, which can easily lead to problems such as large dimensional deviations and poor surface quality, which in turn affects the overall structural strength and assembly accuracy of the restraint bed. While using CNC machine tools for cutting can guarantee cutting accuracy, the equipment purchase cost is high, and subsequent maintenance costs are also high. For many small and medium-sized enterprises, it is difficult to afford such high costs, which has severely restricted the widespread use of CNC machine tools in the cutting and processing of police restraint bed bends and is detrimental to the production and development of small and medium-sized enterprises in the police equipment manufacturing market.

[0004] At the same time, with the continuous development of police equipment technology, in order to improve the comfort and humanization of police restraint devices, or to enhance their restraint performance, functional components such as restraint belts and cushioning pads are usually installed on the restraint equipment. This further puts higher requirements on the cutting accuracy and structural design of restraint bed pipes. Existing cutting equipment and technical means are increasingly difficult to meet the diversified and refined production needs of new police restraint beds. Therefore, it is urgent to develop a pipe cutting device for the manufacture of police restraint beds that can overcome the limitations of existing equipment, reduce production costs, and is suitable for production by small and medium-sized enterprises, so as to promote technological progress and industrial development in the police equipment manufacturing industry. In view of this, we propose a pipe cutting device for the manufacture of police restraint beds. Summary of the Invention

[0005] The purpose of the present invention is to provide a pipe cutting device for manufacturing police restraint beds, so as to solve the technical problem of limitations in the cutting processing of police restraint bed restricted bend pipes.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a pipe cutting device for manufacturing police restraint beds, comprising a machine platform, three-jaw chucks symmetrically provided on the machine platform, an arc motion mechanism provided on the machine platform in front of the three-jaw chucks, two of the three-jaw chucks provided with restraint pipe fastening mechanisms, and a flat rail cutting mechanism provided at the moving end of the arc motion mechanism;

[0007] The flat rail cutting mechanism includes a fixed plate, a rotating ring, an axial rotating block, a cross guide groove, a moving block, a cross guide block, a slider and a knife group, the fixed plate is fixedly arranged at the moving end of the arc motion mechanism, the rotating ring is coaxially rotatably connected to the fixed plate, one end of the axial rotating block is fixedly connected to the rotating ring, the other end of the axial rotating block is on the same axis as the fixed plate and the rotating ring, the cross guide groove is provided on the fixed plate, two cross guide blocks are symmetrically slidably provided on the cross guide groove, the bottom ends of the moving block are rotatably connected to the cross guide block, the top end of the slider is slidably inserted on the axial rotating block, the bottom end of the slider is rotatably connected to the moving block, and the knife group is fixedly arranged on the top end of the slider;

[0008] The inner wall of the cross guide groove is provided with a rail groove, and angled grooves are provided at both ends of the rail groove, and the angled grooves are V-shaped. Guide balls are symmetrically provided on the side surfaces of the cross guide block, and the cross guide block is slidably arranged on the rail groove through the guide balls.

[0009] Due to the rotation of the rotating ring, the limitation of the cross guide groove and the limitation of the shaft rotating block slide groove, the slider drives the knife group to form an elliptical turnover. When the cross guide block and the guide ball slide to the angle groove, the cross guide block drives the moving block to pull the slider and the knife group down, so that the two ends of the ellipse are not cut.

[0010] Preferably, the cross guide groove is X-shaped, the intersecting parts of the cross guide grooves are connected, the sliding track of the cross guide block is an inclined straight line, and the length of the cross guide block is greater than the length of the gap between the intersecting parts of the cross guide grooves.

[0011] Preferably, an inner tooth groove is provided on the inner wall of the rotating ring, and the driving structure engages and drives the inner tooth groove to drive the rotating ring to rotate on the fixed disk.

[0012] Preferably, the driving structure includes a servo motor and a driving gear. The servo motor is arranged on the fixed disk, the driving gear is connected to the output end of the servo motor, and the driving gear is meshed with the internal tooth groove. The servo motor drives the driving gear to rotate, and the driving gear meshes with the internal tooth groove to drive the rotating ring to rotate.

[0013] Preferably, a sliding groove is provided on the shaft rotating block, and the sliding block is slidably inserted in the sliding groove.

[0014] Preferably, the arc motion mechanism includes a fixed arc block, a fixed arc rail and a motion block. The fixed arc block is fixed on the machine platform at a position in front of the three-jaw chuck, the fixed arc rail is fixed on the top of the fixed arc block, the motion block is slidably arranged on the fixed arc rail, and the flat rail cutting mechanism is fixed on the top of the motion block.

[0015] Preferably, an external tooth groove is provided on the outer wall of the fixed arc block, and the bottom end of the moving block is rotatably connected to a climbing gear, and the climbing gear is meshed with the external tooth groove. A sliding ball is provided inside the moving block, and the moving block is slidably arranged on the fixed arc rail through the sliding ball. A motor is provided at the top of the moving block, and the motor drives the climbing gear to rotate, and the climbing gear meshes with the external tooth groove and moves in an arc shape along the fixed arc rail.

[0016] Preferably, the constraint tube fastening mechanism includes a semi-arc frame, a locking drive assembly, a rotating assembly and a connecting rod assembly. The two ends of the semi-arc frame are fixedly connected to the two three-jaw chucks. The rotating assembly is semi-arc-shaped and evenly spaced on the semi-arc frame. The locking drive assembly is fixed on one of the three-jaw chucks. The output end of the locking drive assembly is fixed on one of the rotating assemblies. The connecting rod assembly is hingedly connected between two adjacent rotating assemblies.

[0017] Preferably, the rotating assembly includes a fixed ring and a rotating ring, the fixed ring is semi-arc-shaped and is evenly spaced on the semi-arc frame, the rotating ring is rotatably mounted on the fixed ring, the outer wall of the rotating ring is octagonal, and the output end of the locking drive assembly is fixedly connected to one of the rotating rings.

[0018] Preferably, the connecting rod assembly includes a side hinge rod and a middle hinge rod, the side hinge rod is L-shaped, one end of the side hinge rod is hingedly connected to one side of the outer wall of the rotating ring, and the two adjacent side hinge rods are hingedly connected through the middle hinge rod. The locking drive assembly drives one of the rotating rings to rotate, and the rotating ring drives the side hinge rod to rotate. The side hinge rod drives the other side hinge rod to rotate through the middle hinge rod, and the other side hinge rod drives the other rotating ring to rotate. Several side hinge rods and middle hinge rods form a semi-arc fastening structure, which clamps the constraint tube clamped by the three-jaw chuck in an arc shape.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. When the pipe cutting device for manufacturing police restraint beds of the present invention is working, the symmetrical three-jaw chuck on the machine table initially clamps the pipe, and the restraint pipe fastening mechanism is linked by the connecting rod assembly to form a semi-arc structure to embrace the pipe to achieve double fixation. The arc motion mechanism drives the flat rail cutting mechanism to move along the arc trajectory to adapt to the curved surface of the bent pipe. The driving structure drives the rotating ring to rotate, so that the shaft rotating block rotates coaxially and drives the slider to rotate. At the same time, the slider is limited by the cross guide groove and the cross guide block to slide in the shaft rotating block slide groove. The moving block makes the knife group move in a flat hole-shaped trajectory, thereby forming and processing the special-shaped incision required for the bent pipe in one time. This principle enables the device to efficiently and accurately adapt to the complex curved surface cutting of the police restraint bed bent pipe, avoids the errors of multiple clamping in traditional processes, improves the incision accuracy and flatness, reduces subsequent processes, and improves processing efficiency and safety.

[0021] 2. The incomplete elliptical cutting design of the present invention, on the one hand, can ensure that the cutting waste is still connected to the pipe body when it is not completely cut off, which is convenient for centralized recycling and avoids the problem of waste splashing everywhere and being difficult to collect; on the other hand, it prevents the waste generated by cutting the elbow from falling into the equipment from the cutting part, avoids the accumulation of waste affecting the normal operation of the equipment, reduces the equipment maintenance frequency and downtime caused by cleaning the waste, ensures the stable and efficient operation of the equipment, and at the same time reduces the risk of mechanical failure caused by waste entering the equipment, thereby improving the safety of the cutting operation and the service life of the equipment.

[0022] 3. The sliding ball inside the motion block of the present invention supports its sliding motion on the fixed arc track, reducing frictional resistance. When the motor at the top of the motion block drives the climbing gear to rotate, the climbing gear engages with the external tooth grooves on the outer wall of the fixed arc block. Utilizing the principle of gear transmission, the motor's rotational power is converted into arc motion of the motion block along the fixed arc track, causing the flat rail cutting mechanism fixed to the top of the motion block to move along a preset arc trajectory, achieving precise control and automated adjustment of the cutting position.

[0023] 4. The constraint tube fastening mechanism of the present invention is fixedly connected to the three-jaw chuck at both ends of the semi-arc frame to form a stable support structure. When the locking drive assembly is started, its output end drives the rotating assembly fixed thereto to rotate. The rotating assembly is hinged with the adjacent rotating assembly through the connecting rod assembly, and the rotational motion is transmitted to the entire semi-arc-shaped rotating assembly, so that each rotating assembly is synchronously linked. Since the rotating assembly is mounted on the semi-arc frame, this linkage enables the rotating assembly to move in an arc along the semi-arc frame, thereby realizing the embracing or loosening action of the pipe fitting. Through the geometric constraints of the connecting rod mechanism, the coordinated movement of each rotating assembly is ensured, the tightening force is evenly applied, and the stability of the pipe fitting during the cutting process is improved.

[0024] 5. The locking drive assembly of the present invention drives the rotating sleeve connected to it to rotate around the fixed collar. The octagonal outer wall of the rotating collar drives the hinged L-shaped side hinge rod to swing. The side hinge rod forms a linkage mechanism with the adjacent side hinge rod through the middle hinge rod. When a rotating collar rotates, the swing of the side hinge rod is transmitted to the adjacent side hinge rod through the middle hinge rod, forcing the latter to drive the corresponding rotating collar to rotate synchronously, forming a chain reaction. Since the fixed collars are arranged at equal intervals along the semi-arc frame, the synchronous rotation of each rotating collar causes the connecting rod system composed of the side hinge rod and the middle hinge rod to contract or expand as a whole, and finally forms a semi-arc embracing structure, thereby realizing auxiliary tightening of the constraint tube clamped by the three-jaw chuck. The octagonal outer wall design ensures that the side hinge rod can maintain a stable hinge point at different rotation angles, thereby improving the uniformity and reliability of the tightening force. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of one side of the present invention;

[0026] Figure 2 This is a schematic diagram of the overall structure of the other side of the present invention;

[0027] Figure 3 It is a schematic structural diagram of the three-jaw chuck of the present invention;

[0028] Figure 4 This is a schematic structural diagram of the three-jaw chuck and the restraining tube fastening mechanism of the present invention;

[0029] Figure 5 This is a schematic structural diagram of the restraining tube fastening mechanism of the present invention;

[0030] Figure 6 It is a partial structural diagram of the restraining tube fastening mechanism of the present invention;

[0031] Figure 7 It is a structural schematic diagram of the arc motion mechanism and flat rail cutting mechanism of the present invention;

[0032] Figure 8 It is a schematic cross-sectional structural diagram of the motion block of the present invention;

[0033] Figure 9 It is a structural schematic diagram of the flat rail cutting mechanism of the present invention;

[0034] Figure 10 This is a schematic diagram of the disassembled structure of the flat rail cutting mechanism of the present invention;

[0035] Figure 11 It is a schematic diagram of the cross guide groove and cross guide block structure of the present invention;

[0036] Figure 12 A schematic diagram of the motion trajectory of the flat rail cutting mechanism of the present invention from a top view;

[0037] Figure 13 This is a schematic diagram of the curved pipe structure of the police restraint bed after cutting by the device of the present invention.

[0038] Description of the numbers in the figure:

[0039] 1. Machine; 2. Three-jaw chuck; 3. Arc motion mechanism;

[0040] 301, fixed arc block; 302, fixed arc track; 303, moving block;

[0041] 3011, external tooth groove; 3031, climbing gear; 3032, sliding ball;

[0042] 4. Constraint tube fastening mechanism;

[0043] 401, half arc frame; 402, locking drive assembly; 403, rotating assembly; 404, connecting rod assembly;

[0044] 4031, fixed collar; 4032, rotating collar; 4041, side hinge rod; 4042, middle hinge rod;

[0045] 5. Flat rail cutting mechanism;

[0046] 501, fixed plate; 502, rotating ring; 503, shaft rotating block; 504, cross guide groove; 505, moving block; 506, cross guide block; 507, slider; 508, knife group; 509, driving structure;

[0047] 5021, internal tooth groove; 5031, slide groove; 5041, rail groove; 5042, angle groove; 5061, guide ball;

[0048] 5091, servo motor; 5092, driving gear. DETAILED DESCRIPTION

[0049] like Figures 1 to 13 As shown, the present invention relates to a pipe cutting device for manufacturing police restraint beds, comprising a machine platform 1, on which three-jaw chucks 2 are symmetrically provided, an arc motion mechanism 3 is provided on the machine platform 1 in front of the three-jaw chucks 2, two three-jaw chucks 2 are provided with restraint pipe fastening mechanisms 4, and a flat rail cutting mechanism 5 is provided at the moving end of the arc motion mechanism 3;

[0050] The flat rail cutting mechanism 5 includes a fixed plate 501, a rotating ring 502, an axial rotation block 503, a cross guide groove 504, a moving block 505, a cross guide block 506, a slider 507 and a knife group 508. The fixed plate 501 is fixedly arranged at the moving end of the arc motion mechanism 3, the rotating ring 502 is coaxially connected to the fixed plate 501, one end of the axial rotation block 503 is fixedly connected to the rotating ring 502, and the other end of the axial rotation block 503 is on the same axis as the fixed plate 501 and the rotating ring 502. The cross guide groove 504 is provided on the fixed plate 501, and two cross guide blocks 506 are symmetrically slidably provided on the cross guide groove 504. The bottom ends of the moving block 505 are rotatably connected to the cross guide block 506. The top end of the slider 507 is slidably inserted into the axial rotation block 503. The bottom end of the slider 507 is rotatably connected to the moving block 505, and the knife group 508 is fixedly arranged on the top of the slider 507.

[0051] A rail groove 5041 is formed on the inner wall of the cross guide groove 504. An angle groove 5042 is formed at both ends of the rail groove 5041. The angle groove 5042 is V-shaped. Guide balls 5061 are symmetrically provided on the sides of the cross guide block 506. The cross guide block 506 is slidably mounted on the rail groove 5041 via the guide balls 5061.

[0052] Due to the rotation of the rotating ring 502, the limitation of the cross guide groove 504 and the limitation of the sliding groove of the shaft rotating block 503, the slider 507 drives the knife group 508 to form an elliptical circulation. When the cross guide block 506 and the guide ball 5061 slide to the angle groove 5042, the cross guide block 506 drives the moving block 505 to pull the slider 507 and the knife group 508 down, so that the two ends of the ellipse are not cut.

[0053] The present invention drives the rotating ring 502 to rotate through the driving structure 509. The rotation of the rotating ring 502 drives the shaft rotating block 503 to rotate coaxially. The rotation of the shaft rotating block 503 drives the slider 507 to rotate, and the slider 507 slides in the sliding groove of the shaft rotating block 503 at the same time. The slider 507 drives the moving block 505 connected to the bottom rotation to rotate. Due to the limitation of the cross guide blocks 506 and the cross guide grooves 504 connected to the bottom rotation of both ends of the moving block 505, the slider 507 drives the knife group 508 to move in a flat hole-shaped trajectory, which is suitable for the cutting processing of the bent pipes of police restraint beds.

[0054] When the rotating ring 502 rotates under the action of the drive mechanism, it drives the shaft rotating block 503 to rotate synchronously, thereby rotating the slider 507. Simultaneously, the slider 507 slides radially within the guide groove of the shaft rotating block 503. During this process, the moving block 505, which is pivotally connected to the bottom end of the slider 507, slides within the cross guide groove 504 via the cross guide blocks 506 pivotally connected to the bottom ends of its ends. The cross guide blocks 506 slide within the rail groove 5041 via the guide balls 5061 on the sides. The movement of the moving block 505 is limited by the cross guide groove 504, thereby driving the slider 507 and the blade assembly 508 to form an elliptical epicyclic motion. When the cross guide block 506 and the guide ball 5061 slide to the V-shaped angle groove 5042 at both ends of the rail groove 5041, the special shape of the angle groove 5042 forces the cross guide block 506 to change its displacement. The cross guide block 506 drives the moving block 505 to pull the slider 507 and the knife group 508 down, causing the knife group 508 to pause the cutting action at both ends of the elliptical trajectory.

[0055] When the pipe cutting device for manufacturing police restraint beds of the present invention is working, the symmetrical three-jaw chuck 2 on the machine 1 initially clamps the pipe, and the restraint pipe fastening mechanism 4 is linked by the connecting rod assembly to form a semi-arc structure to embrace the pipe for double fixation, and the arc motion mechanism 3 drives the flat rail cutting mechanism 5 to move along the arc trajectory to adapt to the curved surface of the bent pipe, and the driving structure 509 drives the rotating ring 502 to rotate, so that the shaft rotating block 503 rotates coaxially and drives the slider 507 to rotate. At the same time, the slider 507 is limited by the cross guide groove 504 and the cross guide block 506 to slide in the slide groove of the shaft rotating block 503, and the moving block 505 makes the knife group 508 move in a flat hole-shaped trajectory, thereby forming and processing the special-shaped incision required for the bent pipe in one time. This principle enables the device to efficiently and accurately adapt to the complex curved surface cutting of the police restraint bed bent pipe, avoids the errors of multiple clamping in traditional processes, improves the incision accuracy and flatness, reduces subsequent processes, and improves processing efficiency and safety.

[0056] In an embodiment of the present invention, the cross guide groove 504 is X-shaped, the intersecting parts of the cross guide grooves 504 are connected, the sliding trajectory of the cross guide block 506 is an inclined straight line, and the length of the cross guide block 506 is greater than the gap length of the intersecting parts of the cross guide grooves 504.

[0057] In the present invention, the cross guide groove 504 is X-shaped, and the intersecting portions are connected, providing a sliding track for the cross guide block 506. During operation, the cross guide block 506 slides along an inclined linear trajectory within the cross guide groove 504. Because the length of the cross guide block 506 is greater than the length of the gap between the intersecting portions of the cross guide groove 504, the cross guide block 506 always maintains stable contact with the cross guide groove 504 during the sliding process and does not deviate from the track.

[0058] In this embodiment of the present invention, the inner wall of the rotating ring 502 is provided with an internal tooth groove 5021. The drive structure 509 engages and drives the internal tooth groove 5021, driving the rotating ring 502 to rotate on the fixed disk 501. Utilizing the principle of gear transmission, when the drive structure 509 operates, its power is transmitted to the internal tooth groove 5021 through the meshing of the teeth. Because the internal tooth groove 5021 and the rotating ring 502 are integrally structured, the internal tooth groove 5021, when subjected to force, drives the rotating ring 502 to rotate coaxially on the fixed disk 501. This converts the power of the drive structure 509 into the rotational kinetic energy of the rotating ring 502, providing a stable power input and motion foundation for the movement of subsequent components.

[0059] In an embodiment of the present invention, the driving structure 509 includes a servo motor 5091 and a driving gear 5092. The servo motor 5091 is arranged on the fixed disk 501, and the driving gear 5092 is connected to the output end of the servo motor 5091. The driving gear 5092 is meshed and connected to the internal tooth groove 5021. The servo motor 5091 drives the driving gear 5092 to rotate, and the driving gear 5092 engages the internal tooth groove 5021 to drive the rotating ring 502 to rotate.

[0060] In an embodiment of the present invention, a slot 5031 is provided on the pivot block 503, and a slider 507 is slidably inserted into the slot 5031. In the present invention, the slot 5031 on the pivot block 503 provides a specific motion trajectory for the slider 507. When the pivot block 503 rotates, the slider 507, inserted into the slot 5031, rotates along with the pivot block 503. Simultaneously, due to the guiding effect of the slot 5031, the slider 507 can also slide within the slot along its length. This ability to both rotate with the pivot block and slide linearly within the slot makes the slider 507's motion complex, providing the necessary motion foundation for achieving the specific motion trajectory of the subsequent tool assembly.

[0061] In an embodiment of the present invention, the arc motion mechanism 3 includes a fixed arc block 301, a fixed arc rail 302 and a motion block 303. The fixed arc block 301 is fixedly arranged on the machine 1 in front of the three-jaw chuck 2. The fixed arc rail 302 is fixedly arranged on the top of the fixed arc block 301. The motion block 303 is slidably arranged on the fixed arc rail 302. The flat rail cutting mechanism 5 is fixedly arranged on the top of the motion block 303.

[0062] In the present invention, the fixed arc block 301 provides an arc motion track for the moving block 303 through the fixed arc track 302. The moving block 303 can slide along the fixed arc track 302, and the flat rail cutting mechanism 5 fixed at its top moves along the arc track with the moving block 303, thereby adjusting the cutting position to adapt to the curved curvature of the police restraint bed bend pipe, realizing the positioning and movement of the cutting mechanism on the arc path, and providing basic motion conditions for cutting in accordance with the curved surface of the bend pipe.

[0063] As another embodiment of the present invention, an outer tooth groove 3011 is provided on the outer wall of the fixed arc block 301, and a climbing gear 3031 is rotatably connected to the bottom end of the moving block 303. The climbing gear 3031 is engaged with the outer tooth groove 3011. A sliding ball 3032 is provided inside the moving block 303. The moving block 303 is slidably arranged on the fixed arc rail 302 through the sliding ball 3032. A motor is provided at the top of the moving block 303. The motor drives the climbing gear 3031 to rotate. The climbing gear 3031 engages with the outer tooth groove 3011 and moves in an arc shape along the fixed arc rail 302.

[0064] In the present invention, the sliding ball 3032 inside the motion block 303 supports its sliding motion on the fixed arc track 302, reducing frictional resistance. When the motor at the top of the motion block 303 drives the climbing gear 3031 to rotate, the climbing gear 3031 engages with the external tooth groove 3011 on the outer wall of the fixed arc block 301. Utilizing the principle of gear transmission, the motor's rotational power is converted into an arc motion of the motion block 303 along the fixed arc track 302, causing the flat rail cutting mechanism 5 fixed to the top of the motion block 303 to move along a preset arc trajectory, achieving precise control and automated adjustment of the cutting position.

[0065] As another embodiment of the present invention, the constraint tube fastening mechanism 4 includes a semi-arc frame 401, a locking drive assembly 402, a rotating assembly 403 and a connecting rod assembly 404. The two ends of the semi-arc frame 401 are fixedly connected to the two three-jaw chucks 2. The rotating assembly 403 is semi-arc-shaped and evenly spaced on the semi-arc frame 401. The locking drive assembly 402 is fixed on one of the three-jaw chucks 2. The output end of the locking drive assembly 402 is fixed on one of the rotating assemblies 403. The connecting rod assembly 404 is hingedly connected between the two adjacent rotating assemblies 403.

[0066] In the present invention, the constraint tube fastening mechanism 4 is fixedly connected to the three-jaw chuck 2 at both ends of the semi-arc frame 401 to form a stable support structure. When the locking drive assembly 402 is started, its output end drives the rotation assembly 403 fixed thereto to rotate. The rotation assembly 403 is hinged with the adjacent rotation assembly 403 through the connecting rod assembly 404, and the rotational motion is transmitted to the entire semi-arc-shaped rotation assembly 403, so that each rotation assembly 403 is synchronously linked. Since the rotation assembly 403 is mounted on the semi-arc frame 401, this linkage allows the rotation assembly 403 to move in an arc along the semi-arc frame 401, thereby achieving the action of embracing or loosening the pipe fitting. Through the geometric constraints of the connecting rod mechanism, the movement of each rotation assembly 403 is coordinated, the tightening force is evenly applied, and the stability of the pipe fitting during the cutting process is improved.

[0067] As another embodiment of the present invention, the rotating assembly 403 includes a fixed ring 4031 and a rotating ring 4032. The fixed ring 4031 is semi-arc-shaped and is evenly spaced on the semi-arc frame 401. The rotating ring 4032 is rotatably mounted on the fixed ring 4031. The outer wall of the rotating ring 4032 is octagonal. The output end of the locking drive assembly 402 is fixedly connected to one of the rotating rings 4032.

[0068] As another embodiment of the present invention, the connecting rod assembly 404 includes a side hinge rod 4041 and a middle hinge rod 4042. The side hinge rod 4041 is L-shaped. One end of the side hinge rod 4041 is hingedly connected to one side of the outer wall of the rotating ring 4032. The two adjacent side hinge rods 4041 are hingedly connected through the middle hinge rod 4042. The locking drive assembly 402 drives one of the rotating rings 4032 to rotate. The rotating ring 4032 drives the side hinge rod 4041 to rotate. The side hinge rod 4041 drives the other side hinge rod 4041 to rotate through the middle hinge rod 4042. The other side hinge rod 4041 drives the other rotating ring 4032 to rotate. Several side hinge rods 4041 and middle hinge rods 4042 form a semi-arc fastening structure, which clamps the constraint tube clamped by the three-jaw chuck 2 in an arc shape.

[0069] In the present invention, the locking drive assembly 402 is a worm gear mechanism. The worm gear drives the connected rotating collar 4032 to rotate around the fixed collar 4031. The octagonal outer wall of the rotating collar 4032 drives the hinged L-shaped side hinge rods 4041 to oscillate. These side hinge rods 4041 form a linkage mechanism with adjacent side hinge rods 4041 via the middle hinge rod 4042. When one rotating collar 4032 rotates, the swinging motion of the side hinge rod 4041 is transmitted to the adjacent side hinge rod 4041 via the middle hinge rod 4042, forcing the adjacent side hinge rod 4041 to rotate synchronously, creating a chain reaction. Because the fixed collars 4031 are evenly spaced along the semi-arc frame 401, the synchronous rotation of each rotating collar 4032 causes the linkage system composed of the side hinge rods 4041 and the middle hinge rod 4042 to contract or expand as a whole, ultimately forming a semi-arc-shaped, encircling structure, thereby providing auxiliary tightening for the restraining tube clamped by the three-jaw chuck 2. The octagonal outer wall design ensures that the side hinge rod 4041 can maintain a stable hinge point at different rotation angles, improving the uniformity and reliability of the fastening force.

[0070] Working principle: This embodiment provides a pipe cutting device for manufacturing police restraint beds. When in use, first place the pipe to be cut on the symmetrically arranged three-jaw chuck 2, and the three-jaw chuck 2 initially clamps the pipe; then start the restraint pipe fastening mechanism 4, and the locking drive assembly 402 drives one of the rotating rings 4032 to rotate. The rotating ring 4032 drives the remaining rotating rings 4032 to rotate synchronously through the connecting rod assembly 404 composed of the side hinge rod 4041 and the middle hinge rod 4042, so that multiple rotating rings 4032 are linked along the semi-arc frame 401 to form a semi-arc fastening structure, which further embraces and clamps the pipe.

[0071] Then, according to the bending curvature of the pipe, the motor at the top of the arc motion mechanism 3 is started, and the motor drives the climbing gear 3031 to rotate. The climbing gear 3031 engages with the external tooth groove 3011 on the outer wall of the fixed arc block 301, driving the motion block 303 to move in an arc shape along the fixed arc rail 302, thereby adjusting the position of the flat rail cutting mechanism 5 fixed at the top of the motion block 303.

[0072] Finally, the driving structure 509 of the flat rail cutting mechanism 5 is started, and the servo motor 5091 drives the driving gear 5092 to rotate, and the driving gear 5092 engages the inner tooth groove 5021 on the inner wall of the rotating ring 502, so that the rotating ring 502 rotates on the fixed disk 501; the rotating ring 502 drives the shaft rotating block 503 to rotate coaxially, and the shaft rotating block 503 drives the slider 507 to rotate, while the slider 507 slides in the slide groove 5031 of the shaft rotating block 503; the slider 507 drives the moving block 505 connected to the bottom end to rotate, and the moving block 505 is limited by the cross guide block 506 and the cross guide groove 504 connected to the bottom end of the moving block 505, and finally the slider 507 drives the knife group 508 to move in a flat hole-shaped trajectory. When the guide ball 5061 slides to the V at both ends of the rail groove 5041 When the U-shaped angle groove 5042 is formed, the special shape of the angle groove 5042 forces the cross guide block 506 to change its displacement. The cross guide block 506 drives the moving block 505 to pull the slider 507 and the knife group 508 down, so that the knife group 508 pauses cutting at both ends of the elliptical trajectory, forming an incomplete elliptical cutting trajectory, so that the waste is connected to the pipe body, which is convenient for recycling and prevents the waste from falling into the equipment.

[0073] Finally, after the elbow cutting process is completed, remove the elbow and cut the oval connection and the elbow part by fixed-point cutting. Figure 13 , recycle cutting waste and complete cutting.

[0074] The embodiments disclosed in the present invention are preferred embodiments, but are not limited to them. Ordinary technicians in this field can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. As long as they do not deviate from the spirit of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A pipe cutting device for manufacturing police restraint beds, characterized in that: The machine comprises a platform, wherein three-jaw chucks are symmetrically provided on the platform, an arc motion mechanism is provided on the front of the three-jaw chucks, two of the three-jaw chucks are provided with a restraining tube fastening mechanism, and a flat rail cutting mechanism is provided at the moving end of the arc motion mechanism; The flat rail cutting mechanism includes a fixed plate, a rotating ring, an axial rotating block, a cross guide groove, a moving block, a cross guide block, a slider and a knife group, the fixed plate is fixedly arranged at the moving end of the arc motion mechanism, the rotating ring is coaxially rotatably connected to the fixed plate, one end of the axial rotating block is fixedly connected to the rotating ring, the other end of the axial rotating block is on the same axis as the fixed plate and the rotating ring, the cross guide groove is provided on the fixed plate, two cross guide blocks are symmetrically slidably provided on the cross guide groove, the bottom ends of the moving block are rotatably connected to the cross guide block, the top end of the slider is slidably inserted on the axial rotating block, the bottom end of the slider is rotatably connected to the moving block, and the knife group is fixedly arranged on the top end of the slider; The inner wall of the cross guide groove is provided with a rail groove, and angled grooves are provided at both ends of the rail groove, and the angled grooves are V-shaped. Guide balls are symmetrically provided on the side surfaces of the cross guide block, and the cross guide block is slidably arranged on the rail groove through the guide balls. Due to the rotation of the rotating ring, the limitation of the cross guide groove and the limitation of the shaft rotating block slide groove, the slider drives the knife group to form an elliptical turnover. When the cross guide block and the guide ball slide to the angle groove, the cross guide block drives the moving block to pull the slider and the knife group down, so that the two ends of the ellipse are not cut.

2. The pipe cutting device for manufacturing a police restraint bed according to claim 1, characterized in that: The cross guide groove is X-shaped, the intersection of the cross guide grooves is connected, the sliding track of the cross guide block is an inclined straight line, and the length of the cross guide block is greater than the gap length of the intersection of the cross guide grooves.

3. The pipe cutting device for manufacturing a police restraint bed according to claim 2, characterized in that: An inner tooth groove is provided on the inner wall of the rotating ring, and the inner tooth groove is driven by the driving structure to engage and drive the rotating ring to rotate on the fixed disk.

4. The pipe cutting device for manufacturing a police restraint bed according to claim 3, characterized in that: The driving structure includes a servo motor and a driving gear. The servo motor is arranged on the fixed disk. The driving gear is connected to the output end of the servo motor. The driving gear is meshed with the internal tooth groove. The servo motor drives the driving gear to rotate. The driving gear meshes with the internal tooth groove to drive the rotating ring to rotate.

5. The pipe cutting device for manufacturing police restraint beds according to claim 4, characterized in that: A sliding groove is provided on the shaft rotating block, and the sliding block is slidably inserted in the sliding groove.

6. The pipe cutting device for manufacturing a police restraint bed according to claim 5, characterized in that: The arc motion mechanism includes a fixed arc block, a fixed arc rail and a motion block. The fixed arc block is fixed on the machine platform at a position in front of the three-jaw chuck. The fixed arc rail is fixed on the top of the fixed arc block. The motion block is slidably arranged on the fixed arc rail. The flat rail cutting mechanism is fixed on the top of the motion block.

7. The pipe cutting device for manufacturing a police restraint bed according to claim 6, characterized in that: An external tooth groove is provided on the outer wall of the fixed arc block, and a climbing gear is rotatably connected to the bottom end of the moving block, and the climbing gear is meshed with the external tooth groove. A sliding ball is provided inside the moving block, and the moving block is slidably arranged on the fixed arc rail through the sliding ball. A motor is provided at the top of the moving block, and the motor drives the climbing gear to rotate, and the climbing gear meshes with the external tooth groove and moves in an arc shape along the fixed arc rail.

8. The pipe cutting device for manufacturing police restraint beds according to claim 7, characterized in that: The constraint tube fastening mechanism includes a semi-arc frame, a locking drive assembly, a rotating assembly and a connecting rod assembly. The two ends of the semi-arc frame are fixedly connected to the two three-jaw chucks. The rotating assembly is semi-arc-shaped and evenly spaced on the semi-arc frame. The locking drive assembly is fixed on one of the three-jaw chucks. The output end of the locking drive assembly is fixed on one of the rotating assemblies. The connecting rod assembly is hingedly connected between two adjacent rotating assemblies.

9. The pipe cutting device for manufacturing police restraint beds according to claim 8, characterized in that: The rotating assembly includes a fixed ring and a rotating ring. The fixed ring is semi-arc-shaped and is evenly spaced on the semi-arc frame. The rotating ring is rotatably mounted on the fixed ring. The outer wall of the rotating ring is octagonal. The output end of the locking drive assembly is fixedly connected to one of the rotating rings.

10. The pipe cutting device for manufacturing police restraint beds according to claim 9, characterized in that: The connecting rod assembly includes a side hinge rod and a middle hinge rod, the side hinge rod is L-shaped, one end of the side hinge rod is hingedly connected to one side of the outer wall of the rotating ring, and the two adjacent side hinge rods are hingedly connected through the middle hinge rod. The locking drive assembly drives one of the rotating rings to rotate, and the rotating ring drives the side hinge rod to rotate. The side hinge rod drives the other side hinge rod to rotate through the middle hinge rod, and the other side hinge rod drives the other rotating ring to rotate. Several side hinge rods and middle hinge rods form a semi-arc fastening structure, which clamps the constraint tube clamped by the three-jaw chuck in an arc shape.

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