Pipe fitting cutting device for police restraint bed manufacturing

Abstract

The invention discloses a pipe fitting cutting device for police restraint bed manufacturing, relates to the technical field of pipe cutting devices, and aims to solve the technical problem that limitation exists in cutting machining of a limiting bent pipe of a police restraint bed. A three-jaw chuck is used for preliminarily clamping a pipe fitting, a restraint pipe fastening mechanism forms a semi-arc-shaped structure to surround the pipe fitting, and double fixing is achieved; the arc movement mechanism drives the flat rail cutting mechanism to move along an arc-shaped track so as to be matched with the bent pipe curved surface, the driving structure drives the rotating ring to rotate, the shaft rotating block coaxially rotates and drives the sliding block to rotate, meanwhile, the sliding block is limited by the crossed guide groove and the crossed guide block to slide in the shaft rotating block sliding groove, and the cutter set moves in a flat-hole-shaped track through the moving block. By means of the principle, the device can efficiently and accurately adapt to complex curved surface cutting of the police restraint bed bent pipe, errors caused by multiple times of clamping in the traditional technology are avoided, the notch precision and flatness are improved, subsequent procedures are reduced, and the machining efficiency and safety are improved.

Description

Technical Field

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

[0002] As an important law enforcement auxiliary device, the manufacturing precision and performance of police restraint beds are directly related to law enforcement safety and the comfort of restrained personnel. The key structural components of police restraint beds usually include a large number of restricted bent pipes, and these bent pipes need to be cut with adapted curved grooves and elliptical holes according to design requirements to achieve precise cooperation with components such as restraint locks and adjustment mechanisms, ensuring the reliability and stability of the restraint function.

[0003] Currently, for the cutting and processing of the restricted bent pipes of restraint beds, traditional cutting equipment has significant limitations. Ordinary cutting equipment is difficult to meet the high-precision processing requirements of complex curved grooves and elliptical holes on bent pipes, easily resulting in problems such as large cutting size deviations and poor surface quality, which in turn affect the overall structural strength and assembly precision of the restraint bed. When using numerical control machine tools for cutting and processing, although the cutting precision can be guaranteed, the equipment purchase cost is high, and the subsequent maintenance and repair costs are also relatively high. For many small and medium-sized enterprises, it is difficult to bear such high cost expenditures, which severely restricts the wide application of numerical control machine tools in the field of cutting and processing of bent pipes for police restraint beds, and is not conducive to the production and development of small and medium-sized enterprises in the police equipment manufacturing market.

[0004] Meanwhile, with the continuous development of police equipment technology, in order to improve the comfort and humanization level of police restraint devices, or enhance their restraint performance, functional components such as restraint belts and buffer pads are usually installed on restraint equipment. This further poses higher requirements for the cutting precision and structural design of the pipes of restraint beds, and the 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 manufacturing police restraint beds that can overcome the limitations of existing equipment, reduce production costs, and is suitable for the production of small and medium-sized enterprises, so as to promote the technological progress and industrial development of the police equipment manufacturing industry. In view of this, we propose a pipe cutting device for manufacturing 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 to solve the technical problem of limitations in the cutting and processing of restricted bent pipes of police restraint beds.

[0006] To solve the above technical problems, the present invention provides the following technical solution: A pipe cutting device for manufacturing a police restraint bed, comprising a machine table, on which three-jaw chucks are symmetrically arranged. An arc motion mechanism is arranged on the machine table at the position in front of the three-jaw chucks. A restraint pipe fastening mechanism is arranged on the two three-jaw chucks, and a flat rail cutting mechanism is arranged at the mobile end of the arc motion mechanism; The flat rail cutting mechanism includes a fixed disk, a rotating ring, a shaft rotating block, a cross guide groove, a moving block, a cross guide block, a slider and a cutter set. The fixed disk is fixedly arranged at the mobile end of the arc motion mechanism. The rotating ring is coaxially rotatably connected to the fixed disk. One end of the shaft rotating block is fixedly connected to the rotating ring, and the other end of the shaft rotating block is on the same axis as the fixed disk and the rotating ring. The cross guide groove is arranged on the fixed disk. Two cross guide blocks are symmetrically slidably arranged on the cross guide groove. The bottom ends of both ends of the moving block are rotatably connected to the cross guide blocks. The top end of the slider is slidably inserted into the shaft rotating block, and the bottom end of the slider is rotatably connected to the moving block. The cutter set is fixedly arranged at the top end of the slider; Track grooves are opened on the inner wall of the cross guide groove, and fold angle grooves are opened at both ends of the track grooves. The fold angle grooves are in a V shape. Guide balls are symmetrically arranged on the side surface of the cross guide block, and the cross guide block is slidably arranged on the track 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 chute of the shaft rotating block, the slider drives the cutter set to form an elliptical revolution. When the cross guide block and the guide ball slide to the fold angle groove, the cross guide block drives the moving block to pull the slider and the cutter set down, so that the two ends of the ellipse are not cut.

[0007] Preferably, the cross guide groove is in an X shape, the intersecting part of the cross guide groove is communicated, the sliding track of the cross guide block is in an inclined straight line shape, and the length of the cross guide block is greater than the gap length of the intersecting part of the cross guide groove.

[0008] Preferably, an internal tooth groove is opened on the inner wall of the rotating ring, and the internal tooth groove is driven by a driving structure in a meshing manner to drive the rotating ring to rotate on the fixed disk.

[0009] 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, the driving gear is meshed and connected to 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.

[0010] Preferably, a chute is opened on the shaft rotating block, and the slider is slidably inserted into the chute.

[0011] Preferably, the arc motion mechanism includes a fixed arc block, a fixed arc track and a moving block. The fixed arc block is fixedly arranged on the machine table at a position in front of the three-jaw chuck. The fixed arc track is fixedly arranged at the top of the fixed arc block. The moving block is slidably arranged on the fixed arc track, and the flat rail cutting mechanism is fixedly arranged at the top of the moving block.

[0012] Preferably, external tooth grooves are formed on the outer wall of the fixed arc block. A climbing gear is rotatably connected to the bottom end of the moving block. The climbing gear is meshed and connected to the external tooth grooves. A sliding ball is arranged inside the moving block. The moving block is slidably arranged on the fixed arc track through the sliding ball. A motor is arranged at the top of the moving block. The motor drives the climbing gear to rotate. The climbing gear meshes with the external tooth grooves and moves in an arc shape along the fixed arc track.

[0013] Preferably, the constraint tube fastening mechanism includes a semi-arc frame, a locking drive assembly, a rotating assembly and a connecting rod assembly. Both ends of the semi-arc frame are fixedly connected to the two three-jaw chucks. The rotating assembly is sleeved on the semi-arc frame at equal intervals in a semi-arc shape. The locking drive assembly is fixedly arranged on one of the three-jaw chucks. The output end of the locking drive assembly is fixedly sleeved on one of the rotating assemblies. The connecting rod assembly is hingedly connected between two adjacent rotating assemblies.

[0014] Preferably, the rotating assembly includes a fixed collar and a rotating collar. The fixed collar is sleeved on the semi-arc frame at equal intervals in a semi-arc shape. The rotating collar is rotatably sleeved on the fixed collar. The outer wall of the rotating collar is octagonal. The output end of the locking drive assembly is fixedly connected to one of the rotating collars.

[0015] Preferably, the connecting rod assembly includes a side hinge rod and a middle hinge rod. The side hinge rod is in an L shape. One end of the side hinge rod is hingedly connected to one side of the outer wall of the rotating collar. Two adjacent side hinge rods are hingedly connected through the middle hinge rod. The locking drive assembly drives one of the rotating collars to rotate. The rotating collar drives the side hinge rod to rotate. The side hinge rod drives the other side hinge rod to rotate through the middle hinge rod. The other side hinge rod drives the other rotating collar to rotate. A number of side hinge rods and middle hinge rods form a semi-arc fastening structure to clamp the constraint tube clamped by the three-jaw chuck in an arc shape.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. When the pipe fitting cutting device for manufacturing the police restraint bed of the present invention is working, the three-jaw chucks symmetrically arranged on the machine table initially clamp the pipe fitting. The restraint pipe fastening mechanism forms a semi-circular structure through the linkage of the connecting rod assembly to surround the pipe fitting for double fixation. The arc motion mechanism drives the flat rail cutting mechanism to move along the arc track to adapt to the curved surface of the bent pipe. The driving structure drives the rotating ring to rotate, causing the shaft rotating block to rotate coaxially and driving 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 chute of the shaft rotating block. Through the moving block, the cutter group moves in a flat hole-shaped track, so as to process the special-shaped cut required for the bent pipe in one forming. This principle enables the device to efficiently and accurately adapt to the complex curved surface cutting of the bent pipe of the police restraint bed, avoiding the errors caused by multiple clamping in the traditional process, improving the cutting accuracy and flatness of the cut, reducing subsequent processes, and improving the processing efficiency and safety.

[0017] 2. The incomplete ellipse cutting design of the present invention, on the one hand, can make the cutting waste still connected to the pipe fitting main body in the state of not being completely cut off, which is convenient for centralized recycling and avoids the problem that the waste is splashed everywhere and difficult to collect; on the other hand, it prevents the waste generated by cutting the bent pipe from falling into the equipment interior 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 the waste entering the equipment interior, improving the safety of the cutting operation and the service life of the equipment.

[0018] 3. The sliding ball inside the moving block of the present invention supports its sliding on the fixed arc track, reducing the frictional resistance. When the motor at the top of the moving block drives the climbing gear to rotate, the climbing gear meshes with the external tooth groove on the outer wall of the fixed arc block. Using the gear transmission principle, the rotational power of the motor is converted into the arc motion of the moving block along the fixed arc track, so that the flat rail cutting mechanism fixed at the top of the moving block moves according to the preset arc track, realizing the precise control and automatic adjustment of the cutting position.

[0019] 4. The restraint pipe fastening mechanism of the present invention is fixedly connected to the three-jaw chuck through 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 to the adjacent rotating assembly through the connecting rod assembly, transmitting the rotational motion to the entire semi-circularly arranged rotating assemblies, so that each rotating assembly is synchronously linked. Since the rotating assembly is sleeved on the semi-arc frame, this linkage enables the rotating assembly to perform an arc motion along the semi-arc frame, thereby realizing the action of surrounding or loosening the pipe fitting. Through the geometric constraint of the connecting rod mechanism, it is ensured that the movements of each rotating assembly are coordinated and the fastening force is evenly applied, improving the stability of the pipe fitting during the cutting process.

[0020] 5. The locking drive assembly of the present invention drives the rotating sleeve connected thereto to rotate around the fixed sleeve ring. The octagonal outer wall of the rotating sleeve ring 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 sleeve ring 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 sleeve ring to rotate synchronously, forming a chain reaction. Since the fixed sleeve rings are arranged at equal intervals along the semi-arc frame, the synchronous rotation of each rotating sleeve ring causes the connecting rod system composed of the side hinge rod and the middle hinge rod to contract or open 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

[0021] Figure 1 It is a schematic diagram of the overall structure of one side of the present invention; Figure 2 It is a schematic diagram of the overall structure of the other side of the present invention; Figure 3 It is a schematic diagram of the structure of the three-jaw chuck of the present invention; Figure 4 It is a schematic diagram of the structure of the three-jaw chuck and the restraining tube fastening mechanism of the present invention; Figure 5 It is a structural schematic diagram of the restraining tube fastening mechanism of the present invention; Figure 6 It is a partial structural schematic diagram of the restraining tube fastening mechanism of the present invention; Figure 7 It is a schematic diagram of the structure of the arc motion mechanism and the flat rail cutting mechanism of the present invention; Figure 8 It is a schematic diagram of the cross-sectional structure of the motion block of the present invention; Figure 9 It is a schematic diagram of the structure of the flat rail cutting mechanism of the present invention; Figure 10 It is a schematic diagram of the disassembly structure of the flat rail cutting mechanism of the present invention; Figure 11 It is a schematic diagram of the cross guide groove and the cross guide block structure of the present invention; Figure 12 It is a schematic diagram of the motion trajectory of the flat rail cutting mechanism of the present invention when viewed from above; 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.

[0022] Description of the numbers in the figure: 1. Machine; 2. Three-jaw chuck; 3. Arc motion mechanism; 301, fixed arc block; 302, fixed arc track; 303, moving block; 3011. Outer tooth groove; 3031. Climbing gear; 3032. Slide ball; 4. Constraint tube fastening mechanism; 401. Semi-circular frame; 402. Locking drive assembly; 403. Rotating assembly; 404. Link assembly; 4031. Fixed collar; 4032. Rotating collar; 4041. Side hinge rod; 4042. Middle hinge rod; 5. Flat rail cutting mechanism; 501. Fixed disk; 502. Rotating ring; 503. Axial rotating block; 504. Cross guide groove; 505. Moving block; 506. Cross guide block; 507. Slide block; 508. Knife set; 509. Driving structure; 5021. Inner tooth groove; 5031. Slide groove; 5041. Rail groove; 5042. Fold angle groove; 5061. Guide ball; 5091. Servo motor; 5092. Driving gear. Detailed implementation mode

[0023] As Figures 1 to 13 shown, a pipe cutting device for manufacturing a police restraint bed according to the present invention includes a machine table 1, three-jaw chucks 2 are symmetrically arranged on the machine table 1, an arc motion mechanism 3 is arranged on the machine table 1 at a position in front of the three-jaw chucks 2, a constraint tube fastening mechanism 4 is arranged on the two three-jaw chucks 2, and a flat rail cutting mechanism 5 is arranged at the mobile end of the arc motion mechanism 3; The flat rail cutting mechanism 5 includes a fixed disk 501, a rotating ring 502, an axial rotating block 503, a cross guide groove 504, a moving block 505, a cross guide block 506, a slide block 507 and a knife set 508. The fixed disk 501 is fixedly arranged at the mobile end of the arc motion mechanism 3, the rotating ring 502 is coaxially and rotatably connected to the fixed disk 501, one end of the axial rotating block 503 is fixedly connected to the rotating ring 502, the other end of the axial rotating block 503 is on the same axis as the fixed disk 501 and the rotating ring 502. The cross guide groove 504 is arranged on the fixed disk 501, two cross guide blocks 506 are symmetrically slidably arranged on the cross guide groove 504, the bottom ends of both ends of the moving block 505 are rotatably connected to the cross guide blocks 506, the top end of the slide block 507 is slidably inserted into the axial rotating block 503, the bottom end of the slide block 507 is rotatably connected to the moving block 505, and the knife set 508 is fixedly arranged at the top end of the slide block 507; The inner wall of the cross guide groove 504 is provided with a rail groove 5041, both ends of the rail groove 5041 are provided with fold angle grooves 5042, the fold angle grooves 5042 are in a V shape, guide balls 5061 are symmetrically arranged on the side surfaces of the cross guide blocks 506, and the cross guide blocks 506 are slidably arranged on the rail groove 5041 through the guide balls 5061; Due to the rotation of the rotating ring 502, the limitation of the cross guide groove 504, and the limitation of the chute of the shaft rotating block 503, the slider 507 drives the cutter group 508 to form an elliptical turnover. When the cross guide block 506 and the guide ball 5061 slide to the corner groove 5042, the cross guide block 506 drives the moving block 505 to pull the slider 507 and the cutter group 508 downwards, so that the two ends of the ellipse are not cut.

[0024] In the present invention, the drive structure 509 drives the rotating ring 502 to rotate. 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. At the same time, the slider 507 slides in the chute of the shaft rotating block 503. The slider 507 drives the moving block 505 rotatably connected to the bottom end to rotate. Due to the limitation of the cross guide block 506 rotatably connected to the bottom of both ends and the cross guide groove 504, the slider 507 drives the cutter group 508 to move along a flat hole-shaped trajectory, which is suitable for the cutting process of the bent pipe of the police restraint bed.

[0025] When the rotating ring 502 rotates under the action of the drive structure, it drives the shaft rotating block 503 to rotate synchronously, and then the slider 507 rotates accordingly. At the same time, the slider 507 slides radially in the chute of the shaft rotating block 503. During this process, the moving block 505 rotatably connected to the bottom end of the slider 507 slides in the cross guide groove 504 through the cross guide block 506 rotatably connected to the bottom of both ends. The cross guide block 506 slides in the rail groove 5041 through the guide ball 5061 on the side surface, so that the movement of the moving block 505 is limited by the cross guide groove 504, thereby driving the slider 507 and the cutter group 508 to form an elliptical turnover motion. When the cross guide block 506 and the guide ball 5061 slide to the V-shaped corner groove 5042 at both ends of the rail groove 5041, the special shape of the corner 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 cutter group 508 downwards, so that the cutter group 508 pauses the cutting action at both ends of the elliptical trajectory.

[0026] 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 table 1 initially clamps the pipe, the restraint pipe fastening mechanism 4 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 3 drives the flat rail cutting mechanism 5 to move along an arc trajectory to adapt to the curved surface of the bent pipe, 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, and 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, so as to form and process 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.

[0027] 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.

[0028] In the present invention, the cross guide groove 504 is X-shaped and the intersection is connected, providing a track for the sliding of the cross guide block 506. When in operation, the cross guide block 506 slides in the cross guide groove 504 along an inclined straight line track. Since the length of the cross guide block 506 is greater than the gap length of the intersection of the cross guide groove 504, during the sliding process, the cross guide block 506 always maintains stable contact with the cross guide groove 504 and will not fall off the track.

[0029] In the embodiment of the present invention, an inner tooth groove 5021 is provided on the inner wall of the rotating ring 502, and the driving structure 509 meshes with the inner tooth groove 5021 to drive the rotating ring 502 to rotate on the fixed disk 501. By using the principle of gear transmission, when the driving structure 509 is running, its power is transmitted to the inner tooth groove 5021 through the engagement between teeth. Since the inner tooth groove 5021 and the rotating ring 502 are an integral structure, the inner tooth groove 5021 drives the rotating ring 502 to perform coaxial rotation on the fixed disk 501 after receiving force, realizing the conversion of the power of the driving structure 509 into the rotational kinetic energy of the rotating ring 502, and providing a stable power input and movement basis for the movement of subsequent components.

[0030] 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 meshes with the internal tooth groove 5021 to drive the rotating ring 502 to rotate.

[0031] In an embodiment of the present invention, a chute 5031 is formed on the shaft rotating block 503, and the slider 507 is slidably inserted into the chute 5031. In the present invention, the chute 5031 on the shaft rotating block 503 provides a specific movement track for the slider 507. When the shaft rotating block 503 rotates, the slider 507 inserted into the chute 5031 will rotate together with the shaft rotating block 503; at the same time, due to the guiding effect of the chute 5031, the slider 507 can also slide along the length direction of the chute. This characteristic of being able to rotate with the shaft rotating block and also slide linearly in the chute makes the movement of the slider 507 compound, providing a necessary movement basis for realizing the specific movement track of the subsequent tool group.

[0032] In an embodiment of the present invention, the arc movement mechanism 3 includes a fixed arc block 301, a fixed arc rail 302 and a moving block 303. The fixed arc block 301 is fixedly arranged on the machine table 1 at a position in front of the three-jaw chuck 2, the fixed arc rail 302 is fixedly arranged at the top of the fixed arc block 301, the moving block 303 is slidably arranged on the fixed arc rail 302, and the flat rail cutting mechanism 5 is fixedly arranged at the top of the moving block 303.

[0033] In the present invention, the fixed arc block 301 provides an arc movement track for the moving block 303 through the fixed arc rail 302. The moving block 303 can slide along the fixed arc rail 302, and the flat rail cutting mechanism 5 fixed at its top moves along the arc track with the moving block 303, so as to adjust the cutting position to adapt to the curved surface radian of the bent pipe of the police restraint bed, realizing the positioning and movement of the cutting mechanism on the arc path, and providing basic movement conditions for cutting in cooperation with the curved surface of the bent pipe.

[0034] As another embodiment of the present invention, an external tooth groove 3011 is formed on the outer wall of the fixed arc block 301. A climbing gear 3031 is rotatably connected to the bottom end of the moving block 303, and the climbing gear 3031 is meshed with the external tooth groove 3011. A sliding ball 3032 is arranged inside the moving block 303, and the moving block 303 is slidably arranged on the fixed arc rail 302 through the sliding ball 3032. A motor is arranged at the top of the moving block 303, and the motor drives the climbing gear 3031 to rotate. The climbing gear 3031 meshes with the external tooth groove 3011 and moves in an arc shape along the fixed arc rail 302.

[0035] In the present invention, the sliding ball 3032 inside the moving block 303 supports its sliding on the fixed arc rail 302, reducing the frictional resistance. When the motor at the top of the moving block 303 drives the climbing gear 3031 to rotate, the climbing gear 3031 meshes with the external tooth groove 3011 on the outer wall of the fixed arc block 301. Using the gear transmission principle, the rotational power of the motor is converted into the arc movement of the moving block 303 along the fixed arc rail 302, so that the flat rail cutting mechanism 5 fixed at the top of the moving block 303 moves along the preset arc track, realizing the precise control and automatic adjustment of the cutting position.

[0036] 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. Both ends of the semi-arc frame 401 are fixedly connected to two three-jaw chucks 2. The rotating assembly 403 is sleeved on the semi-arc frame 401 at equal intervals in a semi-circular shape. The locking drive assembly 402 is fixedly arranged on one of the three-jaw chucks 2, and the output end of the locking drive assembly 402 is fixedly sleeved on one of the rotating assemblies 403. The connecting rod assembly 404 is hingedly connected between two adjacent rotating assemblies 403.

[0037] In the present invention, the constraint tube fastening mechanism 4 is fixedly connected to the three-jaw chuck 2 through 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 rotating assembly 403 fixed thereto to rotate. The rotating assembly 403 is hingedly connected to the adjacent rotating assembly 403 through the connecting rod assembly 404, and transmits the rotational motion to the entire semi-circularly arranged rotating assemblies 403, so that each rotating assembly 403 is synchronously linked. Since the rotating assembly 403 is sleeved on the semi-arc frame 401, this linkage causes the rotating assembly 403 to move in an arc along the semi-arc frame 401, thereby realizing the action of embracing or loosening the pipe fitting. Through the geometric constraint of the connecting rod mechanism, it is ensured that the movements of each rotating assembly 403 are coordinated, and the fastening force is evenly applied, improving the stability of the pipe fitting during the cutting process.

[0038] As another embodiment of the present invention, the rotating assembly 403 includes a fixed collar 4031 and a rotating collar 4032. The fixed collar 4031 is sleeved on the semi-arc frame 401 at equal intervals in a semi-circular shape. The rotating collar 4032 is rotatably sleeved on the fixed collar 4031. The outer wall of the rotating collar 4032 is octagonal. The output end of the locking drive assembly 402 is fixedly connected to one of the rotating collars 4032.

[0039] 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 in an L shape. One end of the side hinge rod 4041 is hingedly connected to one side of the outer wall of the rotating collar 4032. 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 collars 4032 to rotate. The rotating collar 4032 drives the side hinge rod 4041 to rotate. The side hinge rod 4041 drives another side hinge rod 4041 to rotate through the middle hinge rod 4042. Another side hinge rod 4041 drives another rotating collar 4032 to rotate. A number of side hinge rods 4041 and middle hinge rods 4042 form a semi-circular fastening structure to embrace and clamp the constraint tube clamped by the three-jaw chuck 2 in an arc shape.

[0040] In the present invention, the locking drive assembly 402 is a worm and worm gear mechanism. The worm drives the worm gear to drive the rotating collar 4032 connected thereto to rotate around the fixed collar 4031. The octagonal outer wall of the rotating collar 4032 drives the articulated L-shaped side hinge rod 4041 to swing. The side hinge rod 4041 forms a linkage mechanism with the adjacent side hinge rod 4041 through the middle hinge rod 4042. When one rotating collar 4032 rotates, the swing of the side hinge rod 4041 is transmitted to the adjacent side hinge rod 4041 through the middle hinge rod 4042, forcing the latter to drive the corresponding rotating collar 4032 to rotate synchronously, forming a chain reaction. Since the fixed collars 4031 are arranged at equal intervals along the semi-arc frame 401, the synchronous rotation of the rotating collars 4032 causes the connecting rod system composed of the side hinge rods 4041 and the middle hinge rods 4042 to contract or expand as a whole, and finally form a semi-circular surrounding structure to realize the auxiliary fastening of the restraint 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.

[0041] Working principle: This embodiment provides a pipe cutting device for manufacturing a police restraint bed. 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 tube fastening mechanism 4, and the locking drive assembly 402 drives one of the rotating collars 4032 to rotate. The rotating collar 4032 drives the remaining rotating collars 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 the multiple rotating collars 4032 are linked along the semi-arc frame 401 to form a semi-circular fastening structure to further surround and clamp the pipe.

[0042] Then, according to the bending radian of the pipe, start the motor at the top of the arc motion mechanism 3. The motor drives the climbing gear 3031 to rotate. The climbing gear 3031 meshes with the external tooth groove 3011 on the outer wall of the fixed arc block 301, driving the moving block 303 to move in an arc along the fixed arc track 302, thereby adjusting the position of the flat rail cutting mechanism 5 fixed to the top of the moving block 303.

[0043] Finally, start the drive structure 509 of the flat rail cutting mechanism 5. The servo motor 5091 drives the drive gear 5092 to rotate. The drive gear 5092 meshes with the internal tooth groove 5021 on the inner wall of the rotating ring 502, causing the rotating ring 502 to rotate on the fixed disk 501. The rotating ring 502 drives the shaft rotating block 503 to rotate coaxially. While the shaft rotating block 503 drives the slider 507 to rotate, the slider 507 slides in the chute 5031 of the shaft rotating block 503. The slider 507 drives the moving block 505 rotatably connected to the bottom end to rotate. Due to the limitation of the cross guide block 506 rotatably connected to the bottom of both ends of the moving block 505 and the cross guide groove 504, finally, the slider 507 drives the cutter group 508 to move in a flat hole-shaped trajectory. When the guide ball 5061 slides to the V-shaped corner groove 5042 at both ends of the rail groove 5041, the special shape of the corner 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 cutter group 508 to descend, causing the cutter group 508 to pause cutting at both ends of the elliptical trajectory, forming an incomplete elliptical cutting trajectory, connecting the waste material to the main body of the pipe fitting, facilitating recycling and preventing the waste material from falling into the equipment.

[0044] Finally, after the bending pipe cutting process is completed, remove the bending pipe and cut the part of the elliptical connection with the bending pipe by fixed-point cutting, as shown in Figure 13 , recycle the cutting waste to complete the cutting.

[0045] The embodiments disclosed in the present invention are preferred embodiments, but are not limited thereto. Those of ordinary skill in the art can easily understand the spirit of the present invention based on the above embodiments and make different extensions and changes. However, as long as they do not depart from the spirit of the present invention, they are within the protection scope of the present invention.

Claims

1. A pipe cutting device for manufacturing a police restraint bed, characterized in that, It includes a machine table, on which three-jaw chucks are symmetrically arranged. An arc motion mechanism is arranged on the machine table at the position in front of the three-jaw chucks. A constraint tube fastening mechanism is arranged on the two three-jaw chucks. A flat rail cutting mechanism is arranged at the mobile end of the arc motion mechanism. The flat rail cutting mechanism includes a fixed disk, a rotating ring, a shaft rotating block, a cross guide groove, a moving block, a cross guide block, a slider and a cutter group. The fixed disk is fixedly arranged at the mobile end of the arc motion mechanism. The rotating ring is coaxially rotatably connected to the fixed disk. One end of the shaft rotating block is fixedly connected to the rotating ring. The other end of the shaft rotating block is on the same axis as the fixed disk and the rotating ring. The cross guide groove is arranged on the fixed disk. Two cross guide blocks are symmetrically slidably arranged on the cross guide groove. The bottom ends of both sides of the moving block are rotatably connected to the cross guide blocks. The top end of the slider is slidably inserted into the shaft rotating block. The bottom end of the slider is rotatably connected to the moving block. The cutter group is fixedly arranged at the top end of the slider. A rail groove is opened on the inner wall of the cross guide groove. Fold angle grooves are opened at both ends of the rail groove. The fold angle grooves are in a V shape. Guide balls are symmetrically arranged on the side surface of the cross guide block. The cross guide block is slidably arranged on the rail groove through the guide balls. Due to the rotation of the rotating ring, the limit of the cross guide groove and the limit of the chute of the shaft rotating block, the slider drives the cutter group to form an elliptical revolution. When the cross guide block and the guide ball slide to the fold angle groove, the cross guide block drives the moving block to pull the slider and the cutter group downwards, 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 in an X shape. The intersecting part of the cross guide groove is communicated. The sliding track of the cross guide block is in an inclined straight line shape. The length of the cross guide block is greater than the gap length of the intersecting part of the cross guide groove.

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

4. A 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 and connected to 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. A pipe cutting device for manufacturing a police restraint bed according to claim 4, characterized in that, A chute is opened on the shaft rotating block. The slider is slidably inserted into the chute.

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 moving block. The fixed arc block is fixedly arranged on the machine table at the position in front of the three-jaw chucks. The fixed arc rail is fixedly arranged at the top end of the fixed arc block. The moving block is slidably arranged on the fixed arc rail. The flat rail cutting mechanism is fixedly arranged at the top end of the moving block.

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

8. A pipe cutting device for manufacturing a police restraint bed according to claim 7, characterized in that, The constraint tube fastening mechanism includes a semi-circular frame, a locking drive assembly, a rotating assembly and a connecting rod assembly. Both ends of the semi-circular frame are fixedly connected to the two three-jaw chucks. The rotating assembly is sleeved on the semi-circular frame at equal intervals in a semi-circular shape. The locking drive assembly is fixedly arranged on one of the three-jaw chucks. The output end of the locking drive assembly is fixedly sleeved on one of the rotating assemblies. The connecting rod assembly is hingedly connected between two adjacent rotating assemblies.

9. A pipe cutting device for manufacturing a police restraint bed according to claim 8, characterized in that, The rotating assembly includes a fixed collar and a rotating collar. The fixed collar is sleeved on the semi-circular frame at equal intervals in a semi-circular shape. The rotating collar is rotatably sleeved on the fixed collar. The outer wall of the rotating collar is octagonal. The output end of the locking drive assembly is fixedly connected to one of the rotating collars.

10. A pipe cutting device for manufacturing a police restraint bed according to claim 9, characterized in that, The connecting rod assembly includes side hinge rods and a middle hinge rod. The side hinge rods are L-shaped. One end of each side hinge rod is hingedly connected to one side of the outer wall of the rotating collar. Two adjacent side hinge rods are hingedly connected through the middle hinge rod. The locking drive assembly drives one of the rotating collars to rotate. The rotating collar drives the side hinge rod to rotate. The side hinge rod drives the other side hinge rod to rotate through the middle hinge rod. The other side hinge rod drives the other rotating collar to rotate. A number of side hinge rods and middle hinge rods form a semi-circular fastening structure to clamp the constraint tube clamped by the three-jaw chuck in an arc shape.

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