Tube embryo cutting device and extrusion die

Abstract

The utility model relates to extrusion die technical field more specifically, relate to a kind of pipe embryo cutting device and extrusion die, including rotating mechanism, telescopic mechanism, cutter and the cutter head that can be rotatably connected with mould core, the cutter is slidably installed on the cutter head, the rotating mechanism is connected with the axis of the cutter head, the telescopic mechanism is connected with the cutter, transmission structure is equipped between the rotating mechanism and the telescopic mechanism, rotating mechanism is driven cutter head rotation simultaneously, by transmission structure drive cutter to extend, make the extension and cutting action between cutter without delay, response speed is fast, can quickly cut off pipe embryo when starting debugging or quickly cut off molten stream when shutdown.

Description

Technical Field

[0001] This utility model relates to the field of extrusion die technology, and more specifically, to a tube blank cutting device and an extrusion die. Background Technology

[0002] In the extrusion molding process of PVC water supply pipes, the start-up and shutdown phases are critical stages affecting production efficiency and product quality. During start-up, factors such as extruder screw speed and temperature fluctuations can easily cause deviations in the preform wall thickness, requiring repeated manual adjustments to the die-mandrel gap based on experience. Traditional methods rely on operators manually cutting the preform at the die exit, then indirectly judging wall thickness uniformity by measuring the cut wall thickness or observing its natural drooping and bending shape. However, manual cutting is inefficient, produces irregular cuts, and poses a risk of burns to the high-temperature preform, resulting in long setup cycles and significant material waste. During shutdown, if the preform is not cut promptly, residual molten material continues to be extruded, causing thinning or deformation of the pipe end wall, leading to dimensional deviations. Existing cutting machines are far from the die, resulting in significant delays between preform extrusion and cutting, as well as delays in cutter extension, impacting both product quality and efficiency. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology, which has a large delay between extruding and cutting the tube blank, and to provide a tube blank cutting device and extrusion die, which can speed up the response speed, quickly extend the cutter and cut after the tube blank is extruded, quickly cut the tube blank during start-up and debugging or quickly cut off the molten material flow when the machine is stopped, thereby improving product quality and work efficiency.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A tube blank cutting device is provided, including a rotating mechanism, a telescopic mechanism, a cutter, and a cutter disc that can be rotatably connected to a mold core. The cutter is slidably mounted on the cutter disc. The rotating mechanism is connected to the axis of the cutter disc. The telescopic mechanism is connected to the cutter. A transmission structure is provided between the rotating mechanism and the telescopic mechanism.

[0006] This utility model discloses a tube blank cutting device. The cutter disc is mounted on the mold core. When the tube blank is extruded from the extrusion port, the rotating mechanism drives the cutter disc to rotate. At the same time, the rotating mechanism drives the telescopic mechanism through the transmission structure to drive the cutter to slide away from the axis of the cutter disc until the cutter extends to a position where it can cut the tube blank. The rotation of the cutter disc drives the cutter to rotate, cutting the tube blank. After cutting, the rotating mechanism drives the cutter disc to reverse, and at the same time, the telescopic mechanism drives the cutter to retract the cutter through the transmission structure, stopping the cutting. The rotating mechanism drives the cutter disc to rotate while simultaneously driving the cutter to extend through the transmission structure, so that there is no delay between the extension of the cutter and the cutting action, and the response speed is fast. It can quickly cut the tube blank during start-up and debugging or quickly cut off the molten material flow when stopping the machine.

[0007] Furthermore, the rotating mechanism includes a drive shaft that can be slidably mounted in the mold core and a drive mechanism that can drive the drive shaft to perform linear reciprocating motion. One end of the drive shaft is connected to the drive mechanism, and the other end is provided with a threaded section. The outer wall of the threaded section is provided with external threads, and the shaft center of the cutter head is provided with a threaded hole that mates with the external threads. The threaded section is threadedly connected to the cutter head. When it is necessary to cut the tube blank, the drive mechanism drives the drive shaft to move in the extrusion direction, causing the threaded section to insert into the threaded hole of the cutter head. The threaded section and the threaded hole move relative to each other. Since the cutter head is rotatably connected to the mold core, the drive shaft drives the cutter head to rotate through the threaded engagement. At the same time, the drive shaft drives the telescopic mechanism through the transmission structure to drive the cutter to extend and cut the tube blank. When it is necessary to stop cutting, the drive mechanism drives the drive shaft to move in the opposite direction, and the telescopic mechanism through the transmission structure drives the cutter to retract, stopping the cutting.

[0008] Furthermore, the driving mechanism includes a rotating shaft slidably mounted in the mold core and a driving device for driving the rotating shaft to rotate. One end of the rotating shaft is fixedly connected to the output end of the driving device, and the outer wall of the other end is provided with a transmission groove. The transmission groove is an annular groove inclined relative to the end face of the rotating shaft. The inner wall of the transmission shaft is provided with a slider that cooperates with the transmission groove. The slider is slidably mounted in the transmission groove. The outer wall of the transmission shaft is provided with a limiting surface for cooperating with the inner wall of the mold core to restrict the rotation of the transmission shaft. When the transmission shaft is driven to move, the driving device drives the rotating shaft to rotate, and the transmission groove on the outer wall of the rotating shaft rotates, causing the slider that cooperates with the transmission groove to move relative to the transmission groove. Since the limiting surface restricts the rotation of the transmission shaft, and the transmission groove is an annular groove inclined relative to the end face of the rotating shaft, the rotating shaft drives the slider to make linear reciprocating motion along the axial direction of the rotating shaft, causing the transmission shaft to make periodic linear reciprocating motion. Through the transmission structure, the cutter is periodically extended and retracted, eliminating the need for manual control of the timing of the cutter's extension and retraction, thus reducing manual operation.

[0009] Furthermore, the telescopic mechanism is an elastic element, one end of which is connected to the cutter head and the other end of which is connected to the cutter. The transmission structure includes a guide section, which is disposed on the transmission shaft and connected to the threaded section. The diameter of the guide section is larger than the diameter of the threaded section, and the diameter of the guide section gradually increases in the direction away from the threaded section. The drive mechanism drives the transmission shaft to move in the extrusion direction. The threaded section of the transmission shaft is inserted into the threaded hole of the cutter head, driving the cutter head to rotate. After the guide section on the transmission shaft contacts the cutter, as the transmission shaft continues to move in the extrusion direction, the guide section and the cutter slide relative to each other. The diameter of the contact position between the guide section and the cutter gradually increases, pushing the cutter to overcome the elastic force of the elastic element, causing the cutter to slide away from the axis of the cutter head until the cutter moves to a position where it can cut the tube blank. The rotation of the cutter head drives the cutter to cut the tube blank. After the cutting work is completed, the drive mechanism drives the transmission shaft to move in the opposite direction. The guide section and the cutter slide relative to each other, and the diameter of the contact position between the guide section and the cutter gradually decreases until the guide section disengages from the cutter. Under the action of the elastic force of the elastic element, the cutter gradually retracts and stops cutting the tube blank.

[0010] Furthermore, the transmission structure also includes a straight section connected to the guide section, and the diameter of the straight section is equal to the maximum diameter of the guide section. During the movement of the transmission shaft along the extrusion direction, the cutter slides relative to the guide section. The guide section pushes the cutter to slide away from the cutter head axis until the cutter contacts the straight section. At this point, the cutter begins to slide relative to the straight section, which continuously supports the cutter, keeping the distance between the cutter and the cutter head axis constant, thus continuously cutting the tube blank.

[0011] Furthermore, the cutter includes a cutter holder and a cutting edge. One end of the cutter holder is connected to the cutting edge, and the other end is provided with an arcuate surface for contacting the guide section. The elastic element is connected to the cutter holder. Providing an arcuate surface on the cutter holder reduces the contact area between the cutter holder and the drive shaft, thereby reducing the frictional resistance between them.

[0012] Furthermore, the cutter head includes a rotating disk and a mounting disk rotatably connected to the mold core. The rotating disk is fixedly mounted on the mounting disk, and the rotating mechanism is connected to the axis of the rotating disk. A first positioning block and a second positioning block are respectively provided on two parallel sides of the cutter holder. The rotating disk has a first sliding groove that mates with the first positioning block, and the mounting disk has a second sliding groove that mates with the second positioning block. The first positioning block is slidably mounted in the first sliding groove, and the second positioning block is slidably mounted in the second sliding groove. The mounting disk is rotated and mounted on the mold core. The second positioning block on the cutter holder is inserted into the second sliding groove of the mounting disk, and the first positioning block of the cutter holder is inserted into the first sliding groove of the rotating disk. The position of the rotating disk is adjusted, and the rotating disk is fixedly mounted on the mounting disk, completing the installation of the cutter head and the cutter.

[0013] An extrusion die is also provided, including a die body and a die core as described above for the tube blank cutting device. The cutter head is rotatably connected to the end face of the die core. The die core is installed in the die body. The end face of the die core connected to the cutter head is located outside the extrusion port of the die body. The die core is provided with an installation cavity communicating with the extrusion port. The drive shaft and the rotating shaft are slidably installed in the installation cavity. The drive device is installed on the die body. During installation, the cutter head is rotated and mounted on the end face of the mold core located outside the mold body. The drive unit is mounted on the mold body, and the transmission shaft and rotating shaft are slidably mounted in the mounting cavity. One end of the rotating shaft is fixedly connected to the output end of the drive unit, and the other end is connected to the transmission shaft to complete the installation. When the machine is started for debugging or when the machine is stopped and the material needs to be cut, the drive unit drives the rotating shaft to rotate. The transmission groove of the rotating shaft rotates, and the transmission groove drives the slider to move linearly, which in turn drives the transmission shaft to move linearly along the extrusion direction. The threaded section of the transmission shaft is inserted into the threaded hole of the cutter head, which drives the cutter head to rotate. After the guide section contacts the cutter, the guide section and the cutter slide relative to each other as the transmission shaft moves. The diameter of the contact position between the guide section and the cutter gradually increases, pushing the cutter to slide away from the axis of the cutter head until the cutter can cut the tube blank. The rotation of the cutter head drives the cutter to cut the tube blank extruded from the extrusion port.

[0014] Furthermore, the drive shaft is provided with a positioning section, the axial cross-section of which is polygonal, and the limiting surface is the side surface of the positioning section. The mounting cavity fits against the limiting surface. The fitting of the limiting surface of the positioning section with the mounting cavity restricts the circumferential position of the drive shaft, prevents the drive shaft from rotating with the rotating shaft, and ensures that the drive shaft can perform linear motion under the drive of the rotating shaft.

[0015] Furthermore, it also includes a bearing. A bearing mounting groove is provided on the side of the cutter head opposite the mold core. The outer ring of the bearing is fixedly installed in the bearing mounting groove, and the inner ring of the bearing is fixedly sleeved on the mold core. The cutter head and the mold core are rotatably connected via the bearing, reducing the frictional resistance between the cutter head and the mold core, reducing energy loss, and improving working efficiency.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] The tube blank cutting device and extrusion mold of this utility model have the following features: 1. The rotating mechanism drives the cutter head to rotate while simultaneously extending the cutter head through a transmission structure, ensuring no delay between the cutter head extension and the cutting action, resulting in a fast response speed. This allows for rapid cutting of the tube blank during startup and debugging or rapid cutting of the molten material flow during shutdown. 2. The driving device drives the rotating shaft to rotate in one direction, which, through the cooperation of the transmission shaft and the slider, drives the transmission shaft to perform periodic linear reciprocating motion. The transmission structure then drives the cutter head to periodically extend and retract, eliminating the need for manual control of the timing of the cutter head extension and retraction, thus reducing manual operation. 3. The cutter head is mounted on the end face of the mold core, close to the extrusion port of the mold body, reducing the delay between extruding the tube blank and cutting the tube blank. Attached Figure Description

[0018] Figure 1 This is a first structural schematic diagram of the tube blank cutting device of this utility model;

[0019] Figure 2 This is a schematic diagram of the second structure of the tube blank cutting device of this utility model;

[0020] Figure 3 This is a schematic diagram of the third structure of the tube blank cutting device of this utility model;

[0021] Figure 4 This is a schematic diagram of the fourth structure of the tube blank cutting device of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the cutter of the tube blank cutting device of this utility model;

[0023] Figure 6 This is a schematic diagram of the first structure of the rotating shaft of the tube blank cutting device of this utility model;

[0024] Figure 7 This is a schematic diagram of the second structure of the rotating shaft of the tube blank cutting device of this utility model;

[0025] Figure 8 This is a schematic diagram of the first structure of the extrusion die of this utility model;

[0026] Figure 9 This is a schematic diagram of the second structure of the extrusion die of this utility model.

[0027] In the attached diagram: 1. Cutter head; 11. Rotary disk; 111. First slide groove; 112. First connecting hole; 113. Screw hole; 12. Mounting disk; 121. Second slide groove; 122. Second connecting hole; 123. Second center hole; 13. Connector; 2. Cutter; 21. Cutter holder; 211. Arc surface; 212. First positioning block; 213. Second positioning block; 22. Cutter edge; 3. Rotating mechanism; 31. Drive shaft; 311. Threaded section; 312. Transmission structure; 3 121; Guide section; 3122; Straight section; 313; Positioning section; 314; Slider; 32; Drive mechanism; 321; Drive device; 3211; Rotary motor; 3212; Drive gear; 3213; Driven gear; 3214; Transmission wheel; 3215; Chain; 3216; First support; 3217; Second support; 322; Rotating shaft; 3221; Transmission groove; 4; Telescopic mechanism; 5; Bearing; 6; Mold core; 61; Mounting cavity; 7; Mold body. Detailed Implementation

[0028] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0029] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0030] Example 1

[0031] like Figures 1 to 8 The first embodiment of the tube blank cutting device of this utility model is shown, including a rotating mechanism 3, a telescopic mechanism 4, a cutter 2 and a cutter disc 1 that can be rotatably connected to the mold core 6. The cutter 2 is slidably mounted on the cutter disc 1. The rotating mechanism 3 is connected to the axis of the cutter disc 1. The telescopic mechanism 4 is connected to the cutter 2. A transmission structure 312 is provided between the rotating mechanism 3 and the telescopic mechanism 4.

[0032] The tube blank cutting device of this utility model has a cutter disc 1 installed on a mold core 6. When the tube blank is extruded from the extrusion port, the rotating mechanism 3 drives the cutter disc 1 to rotate. At the same time, the rotating mechanism 3 drives the telescopic mechanism 4 through the transmission structure 312 to drive the cutter 2 to slide away from the axis of the cutter disc 1 until the cutter 2 extends to a position where it can cut the tube blank. The rotation of the cutter disc 1 drives the cutter 2 to rotate and cut the tube blank. After the cutting is completed, the rotating mechanism 3 drives the cutter disc 1 to reverse and drives the telescopic mechanism 4 through the transmission structure 312 to retract the cutter 2 and stop the cutting. While the rotating mechanism 3 drives the cutter disc 1 to rotate, it drives the cutter 2 to extend through the transmission structure 312, so that there is no delay between the extension of the cutter 2 and the cutting action, the response speed is fast, and it can quickly cut the tube blank during start-up and debugging or quickly cut off the molten material flow when stopping the machine.

[0033] like Figure 1 and Figure 2 As shown, the rotating mechanism 3 includes a transmission shaft 31 that can be slidably mounted in the mold core 6 and a drive mechanism 32 that can drive the transmission shaft 31 to perform linear reciprocating motion. One end of the transmission shaft 31 is connected to the drive mechanism 32, and the other end is provided with a threaded section 311. The outer wall of the threaded section 311 is provided with external threads. The shaft of the cutter head 1 is provided with a threaded hole 113 that mates with the external threads. The threaded section 311 is threadedly connected to the cutter head 1. When it is necessary to cut the tube blank, the drive mechanism 32 drives the transmission shaft 31 to move in the extrusion direction, causing the threaded section 311 to insert into the threaded hole 113 of the cutter head 1. The threaded section 311 and the threaded hole 113 move relative to each other. Since the cutter head 1 is rotatably connected to the mold core 6, the transmission shaft 31 drives the cutter head 1 to rotate through the threaded engagement. At the same time, the transmission shaft 31 drives the telescopic mechanism 4 through the transmission structure 312 to drive the cutter 2 to extend and cut the tube blank. When it is necessary to stop cutting, the drive mechanism 32 drives the transmission shaft 31 to move in the opposite direction, and the telescopic mechanism 4 through the transmission structure 312 causes the cutter 2 to retract and stop cutting.

[0034] like Figure 8 As shown, the drive mechanism 32 includes a rotating shaft 322 that can be slidably mounted in the mold core 6 and a drive device 321 for driving the rotating shaft 322 to rotate. One end of the rotating shaft 322 is fixedly connected to the output end of the drive device 321, and the outer wall of the other end is provided with a transmission groove 3221. The transmission groove 3221 is an annular groove that is inclined relative to the end face of the rotating shaft 322. Figure 6 and Figure 7As shown, the inner wall of the drive shaft 31 is provided with a slider 314 that cooperates with the drive groove 3221. The slider 314 is slidably installed in the drive groove 3221. The outer wall of the drive shaft 31 is provided with a limiting surface for cooperating with the inner wall of the mold core 6 to restrict the rotation of the drive shaft 31. When the drive shaft 31 is driven to move, the drive device 321 drives the rotating shaft 322 to rotate. The drive groove 3221 on the outer wall of the rotating shaft 322 rotates, causing the slider 314 that cooperates with the drive groove 3221 to move relative to the drive groove 3221. Since the limiting surface restricts the rotation of the drive shaft 31, and the drive groove 3221 is an annular groove inclined to the end face of the rotating shaft 322, the rotating shaft 322 drives the slider 314 to make linear reciprocating motion along the axial direction of the rotating shaft 322, causing the drive shaft 31 to make periodic linear reciprocating motion. Through the transmission structure 312, the cutter 2 is driven to extend and retract periodically. There is no need for manual control of the timing of the extension and retraction of the cutter 2, reducing manual operation. In this embodiment, the transmission groove 3221 includes two interconnected V-shaped support grooves, such as... Figure 6 and Figure 7 As shown.

[0035] The working principle of the tube blank cutting device in this embodiment is as follows: The cutter disc 1 is installed on the mold core 6. When the tube blank is extruded from the extrusion port, the drive device 321 drives the rotating shaft 322 to rotate. The transmission groove 3221 on the outer wall of the rotating shaft 322 rotates, causing the slider 314, which cooperates with the transmission groove 3221, to move relative to the transmission groove 3221. Since the limiting surface restricts the rotation of the transmission shaft 31, the rotating shaft 322 drives the transmission shaft 31 to move linearly along the extrusion direction, causing the threaded section 311 to be inserted into the threaded hole 113 of the cutter disc 1. The threaded section 311 and the threaded hole 113 move relative to each other. Since the cutter disc 1 is rotatably connected to the mold core 6, the transmission shaft 31... The screw thread drives the cutter head 1 to rotate, while the rotating mechanism 3 drives the telescopic mechanism 4 through the transmission structure 312 to drive the cutter 2 to slide away from the axis of the cutter head 1 until the cutter 2 extends to a position where it can cut the tube blank. The rotation of the cutter head 1 drives the cutter 2 to rotate, cutting the tube blank until the slider 314 of the transmission shaft moves to the position closest to the cutter head 1 in the transmission groove 3221. The driving device 321 continues to drive the rotating shaft 322 to rotate, and the transmission groove 3221 drives the slider 314 to move in the opposite direction, driving the transmission shaft 31 to move in the opposite direction. Through the transmission structure 312, the telescopic mechanism 4 drives the cutter 2 to retract and stop cutting.

[0036] Example 2

[0037] This embodiment is the second embodiment of the tube blank cutting device of this utility model. This embodiment is similar to the first embodiment, except that, as Figure 1As shown, the telescopic mechanism 4 is an elastic element. One end of the elastic element is connected to the cutter head 1, and the other end is connected to the cutter 2. The transmission structure 312 includes a guide section 3121, which is mounted on the transmission shaft 31 and connected to the threaded section 311. The diameter of the guide section 3121 is larger than the diameter of the threaded section 311, and the diameter of the guide section 3121 gradually increases in the direction away from the threaded section 311. The drive mechanism 32 drives the transmission shaft 31 to move along the extrusion direction. The threaded section 311 of the transmission shaft 31 is inserted into the threaded hole 113 of the cutter head 1, driving the cutter head 1 to rotate. After the guide section 3121 on the transmission shaft 31 contacts the cutter 2, as the transmission shaft 31 continues to move along the extrusion direction, the guide section 3121 and the cutter 2 slide relative to each other. The diameter of the contact position between the guide section 3121 and the cutter 2 gradually increases, pushing the cutter 2 to overcome the elastic force of the elastic element, causing the cutter 2 to slide away from the axis of the cutter head 1 until the cutter 2 moves to a position where it can cut the tube blank. The rotation of the cutter head 1 drives the cutter 2 to cut the tube blank. Figure 3 As shown; after the cutting operation is completed, the drive mechanism 32 drives the transmission shaft 31 to move in the opposite direction, and the guide section 3121 slides relative to the cutter 2. The diameter of the contact position between the guide section 3121 and the cutter 2 gradually decreases until the guide section 3121 disengages from the cutter 2. Under the action of the elastic force of the elastic element, the cutter 2 gradually retracts and stops cutting the tube blank. In this embodiment, the elastic element is a spring, and the outer wall of the guide section 3121 is an inclined surface.

[0038] The transmission structure 312 also includes a straight section 3122, which is connected to the guide section 3121, and the diameter of the straight section 3122 is equal to the maximum diameter of the guide section 3121. During the movement of the transmission shaft 31 along the extrusion direction, the cutter 2 slides relative to the guide section 3121. The guide section 3121 pushes the cutter 2 to slide away from the axis of the cutter head 1 until the cutter 2 contacts the straight section 3122. The cutter 2 then begins to slide relative to the straight section 3122, which continuously supports the cutter 2, keeping the distance between the cutter 2 and the axis of the cutter head 1 constant, thus continuously cutting the tube blank. Figure 4 As shown.

[0039] like Figure 5 As shown, the cutter 2 includes a cutter holder 21 and a cutting edge 22. One end of the cutter holder 21 is connected to the cutting edge 22, and the other end is provided with an arc surface 211 for contacting the guide section 3121. An elastic element is connected to the cutter holder 21. The arc surface 211 on the cutter holder 21 can reduce the contact area between the cutter holder 21 and the drive shaft 31, thereby reducing the frictional resistance between the cutter holder 21 and the drive shaft 31.

[0040] The cutter head 1 includes a rotating disk 11 and a mounting disk 12 that can be rotatably connected to the mold core 6. The rotating disk 11 is fixedly mounted on the mounting disk 12. The rotating mechanism 3 is connected to the axis of the rotating disk 11. The two parallel sides of the cutter holder 21 are respectively provided with a first positioning block 212 and a second positioning block 213. The rotating disk 11 is provided with a first sliding groove 111 that cooperates with the first positioning block 212. The mounting disk 12 is provided with a second sliding groove 121 that cooperates with the second positioning block 213. The first positioning block 212 is slidably mounted in the first sliding groove 111, and the second positioning block 213 is slidably mounted in the second sliding groove 121. The mounting disk 12 is rotatably mounted on the mold core 6. The second positioning block 213 on the cutter holder 21 of the cutter 2 is installed in the second sliding groove 121 of the mounting disk 12. The first positioning block 212 of the cutter holder 21 is installed in the first sliding groove 111 of the rotating disk 11. The position of the rotating disk 11 is adjusted, and the rotating disk 11 is fixedly mounted on the mounting disk 12, thus completing the installation of the cutter head 1 and the cutter 2. In this embodiment, the first slide groove 111 is evenly distributed along the circumference of the rotating disk 11, and the second slide groove 121 is evenly distributed along the circumference of the mounting disk 12; the first positioning block 212 is an oblong block, and the second positioning block 213 is a square block; a first central hole is provided at the axis of the rotating disk 11, and a screw sleeve is fixedly installed in the first central hole, and a screw hole 113 is provided on the screw sleeve; a second central hole 123 is provided at the axis of the mounting disk 12 for the transmission shaft 31 to pass through; one end of the elastic element is fixedly connected to the second positioning block 213, and the other end is fixedly connected to the inner wall of the second slide groove 121.

[0041] like Figure 1 As shown, it also includes a connector 13. The rotating disk 11 has a first connecting hole 112, and the mounting disk 12 has a second connecting hole 122. One end of the connector 13 is fixedly installed in the first connecting hole 112, and the other end is fixedly installed in the second connecting hole 122. In this embodiment, the connector 13 is a bolt. The first connecting holes 112 are evenly distributed along the circumference of the rotating disk 11, and the second connecting holes 122 are evenly distributed along the circumference of the mounting disk 12. Each first connecting hole 112 is located between two adjacent first sliding grooves 111 in the circumferential direction of the rotating disk 11, and each second connecting hole 122 is located between two adjacent second sliding grooves 121 in the circumferential direction of the mounting disk 12.

[0042] The working principle of the extrusion mold in this embodiment is as follows: During installation, the mounting plate 12 is rotated and mounted on the mold core 6. The second positioning block 213 on the cutter holder 21 of the cutter 2 is installed in the second slide groove 121 of the mounting plate 12. The first positioning block 212 of the cutter holder 21 is installed in the first slide groove 111 of the rotating plate 11. One end of the elastic element is connected to the cutter holder 21, and the other end is connected to the inner wall of the second slide groove 121. The position of the rotating plate 11 is adjusted so that the first connecting hole 112 of the rotating plate 11 is aligned with the second connecting hole 122 of the mounting plate 12. The two ends of the connector 13 are respectively fixedly installed in the first connecting hole 112 and the second connecting hole 122, thereby fixing the rotating plate 11 and the mounting plate 12 together, completing the installation of the cutter disc 1 and the cutter 2. Figure 1 and Figure 2 As shown; the drive device 321 drives the rotating shaft 322 to rotate, which in turn drives the transmission shaft 31 to move along the extrusion direction. The threaded section 311 of the transmission shaft 31 passes through the second center hole 123 of the mounting plate 12 and is inserted into the threaded hole 113 of the rotating plate 11. The external thread of the threaded section 311 engages with the internal thread of the threaded hole 113, driving the rotating plate 11 to rotate. This, in turn, drives the mounting plate 12, which is fixedly connected to the rotating plate 11 via the connector 13, to rotate. After the guide section 3121 on the transmission shaft 31 contacts the arc surface 211 of the cutter holder 21, as the transmission shaft 31 continues to move along the extrusion direction, the guide section 3121 and the cutter holder 21 slide relative to each other. The diameter of the contact position between the guide section 3121 and the cutter holder 21 gradually increases, pushing the cutter 2 to overcome the elastic force of the elastic element and causing the cutter 2 to slide away from the axis of the cutter disc 1. Figure 3 As shown; when the straight section 3122 contacts the cutter holder 21, the cutting edge 22 has moved to a position where it can cut the tube blank. The drive shaft 31 continues to move along the extrusion direction, and the cutter holder 21 slides relative to the straight section 3122. The straight section 3122 continuously supports the cutter holder 21, keeping the distance between the cutting edge 22 and the axis of the cutter disc 1 constant. The rotation of the cutter disc 1 drives the cutter 2 to continuously cut the tube blank, as shown. Figure 4 As shown; after the slider 314 moves to the position closest to the cutter head 1 in the transmission groove 3221, the drive device 321 continues to drive the rotating shaft 322 to rotate, causing the transmission shaft 31 to move in the opposite direction. The cutter head 21 slides relative to the straight section 3122. After disengaging from the straight section 3122, the cutter head 21 slides relative to the guide section 3121. The diameter of the contact position between the guide section 3121 and the cutter head 21 gradually decreases until the cutter head 21 disengages from the guide section 3121. Under the action of the elastic force of the elastic element, the cutter 2 gradually retracts and stops cutting the tube blank.

[0043] Example 3

[0044] This embodiment is the first embodiment of the extrusion mold of this utility model, such as... Figure 9As shown, the device includes a mold body 7, a mold core 6, and a tube blank cutting device as described in Embodiment 2. The cutter head 1 is rotatably connected to the end face of the mold core 6. The mold core 6 is installed in the mold body 7, and the end face of the mold core 6 connected to the cutter head 1 is located outside the extrusion port of the mold body 7. The mold core 6 has an installation cavity 61 communicating with the extrusion port. The drive shaft 31 and the rotating shaft 322 are slidably installed in the installation cavity 61, and the drive device 321 is installed on the mold body 7. During installation, the cutter head 1 is rotatably installed on the end face of the mold core 6 located outside the mold body 7, the drive device 321 is installed on the mold body 7, and the drive shaft 31 and the rotating shaft 322 are slidably installed in the installation cavity 61. One end of the rotating shaft 322 is fixedly connected to the output end of the drive device 321, and the other end is connected to the drive shaft 31, thus completing the installation. When the machine is started for debugging or when the machine is stopped and the material needs to be cut, the drive device 321 drives the rotating shaft 322 to rotate. The transmission groove 3221 of the rotating shaft 322 rotates, and the transmission groove 3221 drives the slider 314 to move. The linear motion drives the drive shaft 31 to move linearly along the extrusion direction. The threaded section 311 of the drive shaft 31 is inserted into the threaded hole 113 of the cutter head 1, which drives the cutter head 1 to rotate. After the guide section 3121 contacts the cutter 2, the guide section 3121 and the cutter 2 slide relative to each other as the drive shaft 31 moves. The diameter of the contact position between the guide section 3121 and the cutter 2 gradually increases, pushing the cutter 2 to slide away from the axis of the cutter head 1 until the cutter 2 can cut the tube blank. The rotation of the cutter head 1 drives the cutter 2 to cut the tube blank extruded from the extrusion port.

[0045] like Figure 1 and Figure 9 As shown, the drive shaft 31 is provided with a positioning section 313. The axial cross-section of the positioning section 313 is polygonal, and the limiting surface is the side surface of the positioning section 313. The mounting cavity 61 is in contact with the limiting surface. The limiting surface of the positioning section 313 is in contact with the mounting cavity 61, which restricts the circumferential position of the drive shaft 31, prevents the drive shaft 31 from rotating with the rotating shaft 322, and ensures that the drive shaft 31 can make linear motion under the drive of the rotating shaft 322.

[0046] like Figure 1 , Figure 2 and Figure 9 As shown, it also includes a bearing 5. A bearing 5 fixing groove is provided on the side of the cutter head 1 opposite to the mold core 6. The outer ring of the bearing 5 is fixedly installed in the bearing 5 fixing groove, and the inner ring of the bearing 5 is fixedly sleeved on the mold core 6. The cutter head 1 and the mold core 6 are rotatably connected by the bearing 5, which reduces the frictional resistance between the cutter head 1 and the mold core 6, reduces energy loss, and improves working efficiency.

[0047] In this embodiment, the bearing 5 fixing groove is located on the side of the mounting plate 12 facing the mold core 6; the drive device 321 includes a rotary motor 3211, a chain 3215, a drive gear 3212, a driven gear 3213, a transmission wheel 3214, a first bracket 3216, and a second bracket 3217. The first bracket 3216 and the second bracket 3217 are located on the outer wall of the mold body 7. The rotary motor 3211 is fixedly mounted on the first bracket 3216, and the shaft of the drive gear 3212 is fixedly connected to the output end of the rotary motor 3211. Next, there are two second supports 3217, which are symmetrically distributed on both sides of the first support 3216. There are two transmission wheels 3214, which are rotatably mounted on the two second supports 3217 respectively. The axis of the driven gear 3213 is fixedly connected to the rotating shaft 322. The mold body 7 is provided with two through holes for the chain 3215 to pass through. The chain 3215 passes through the through holes, and the inner side of the chain 3215 abuts against the driving gear 3212, the driven gear 3213 and the transmission wheel 3214.

[0048] The working principle of the extrusion mold in this embodiment is as follows: During installation, the mounting plate 12 is rotatably mounted on the end face of the mold core 6 located outside the mold body 7. The rotary motor 3211 is mounted on the first bracket 3216 of the mold body 7, the transmission wheel 3214 is mounted on the second bracket 3217, the drive gear 3212 is fixedly mounted on the output end of the rotary motor 3211, and the transmission shaft 31 and the rotary shaft 322 are slidably mounted in the mounting cavity 61. One end of the rotary shaft 322 is fixedly connected to the driven gear 3213, and the other end is connected to the transmission shaft 31. The chain 3215 is wrapped around the drive gear 3212, the transmission wheel 3214, and the driven gear 3213 and tightened to complete the installation. When starting the machine for debugging or stopping the machine to cut the tube blank, the rotary motor 3211 drives the drive gear 3212 to rotate. The drive gear 3212 drives the chain 3215 to move, which drives the driven gear 3213 to rotate. The driven gear 3213 drives the rotary shaft 322 to rotate, which drives the transmission groove of the rotary shaft 322. As the positioning section 313 abuts against the inner wall of the mounting cavity 61 of the mold core 6, the drive shaft 31 will not rotate with the rotating shaft 322. The drive groove 3221 drives the slider 314 to move linearly, which in turn drives the drive shaft 31 to move linearly along the extrusion direction. The threaded section 311 of the drive shaft 31 is inserted into the threaded hole 113 of the rotating disk 11, causing the rotating disk 11 and the mounting disk 12 to rotate. After the guide section 3121 contacts the arc section of the tool holder 21, it pushes the tool along with the movement of the drive shaft 31. The moving cutter 2 slides away from the axis of the cutter head 1. After the cutter holder 21 contacts the straight section 3122, the distance between the cutting edge 22 and the axis of the rotating disk 11 remains unchanged. The rotation of the cutter head 1 drives the cutter 2 to continuously cut the tube blank extruded from the extrusion port. After the slider 314 moves to the position of the transmission groove 3221 closest to the cutter head 1, the drive device 321 continues to drive the rotating shaft 322 to rotate, driving the transmission shaft 31 to move in the opposite direction. The cutter 2 is reset by the elastic force of the elastic element and stops cutting the tube blank.

[0049] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0050] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A tube blank cutting device, characterized in that, It includes a rotating mechanism (3), a telescopic mechanism (4), a cutter (2), and a cutter disc (1) that can be rotatably connected to the mold core (6). The cutter (2) is slidably mounted on the cutter disc (1). The rotating mechanism (3) is connected to the axis of the cutter disc (1). The telescopic mechanism (4) is connected to the cutter (2). A transmission structure (312) is provided between the rotating mechanism (3) and the telescopic mechanism (4).

2. The tube blank cutting device according to claim 1, characterized in that, The rotating mechanism (3) includes a transmission shaft (31) that can be slidably installed in the mold core (6) and a drive mechanism (32) that can drive the transmission shaft (31) to perform linear reciprocating motion. One end of the transmission shaft (31) is connected to the drive mechanism (32), and the other end is provided with a threaded section (311). The outer wall of the threaded section (311) is provided with an external thread. The shaft of the cutter disc (1) is provided with a threaded hole (113) that mates with the external thread. The threaded section (311) is threadedly connected to the cutter disc (1).

3. The tube blank cutting device according to claim 2, characterized in that, The drive mechanism (32) includes a rotating shaft (322) that can be slidably installed in the mold core (6) and a drive device (321) for driving the rotating shaft (322) to rotate. One end of the rotating shaft (322) is fixedly connected to the output end of the drive device (321), and the outer wall of the other end is provided with a transmission groove (3221). The transmission groove (3221) is an annular groove that is inclined relative to the end face of the rotating shaft (322). The inner wall of the transmission shaft (31) is provided with a slider (314) that cooperates with the transmission groove (3221). The slider (314) is slidably installed in the transmission groove (3221). The outer wall of the transmission shaft (31) is provided with a limiting surface for cooperating with the inner wall of the mold core (6) to limit the rotation of the transmission shaft (31).

4. The tube blank cutting device according to claim 3, characterized in that, The telescopic mechanism (4) is an elastic element. One end of the elastic element is connected to the cutter disc (1), and the other end is connected to the cutter (2). The transmission structure (312) includes a guide section (3121) for contacting the cutter (2). The guide section (3121) is disposed on the transmission shaft (31) and connected to the threaded section (311). The diameter of the guide section (3121) is larger than the diameter of the threaded section (311). The diameter of the guide section (3121) gradually increases in the direction away from the threaded section (311).

5. The tube blank cutting device according to claim 4, characterized in that, The transmission structure (312) further includes a straight section (3122), which is connected to the guide section (3121), and the diameter of the straight section (3122) is equal to the maximum diameter of the guide section (3121).

6. The tube blank cutting device according to claim 4, characterized in that, The cutter (2) includes a cutter holder (21) and a cutting edge (22). One end of the cutter holder (21) is connected to the cutting edge (22), and the other end is provided with an arc surface (211) for contacting the guide section (3121). The elastic element is connected to the cutter holder (21).

7. The tube blank cutting device according to claim 6, characterized in that, The cutter head (1) includes a rotating disk (11) and a mounting disk (12) that can be rotatably connected to the mold core (6). The rotating disk (11) is fixedly mounted on the mounting disk (12). The rotating mechanism (3) is connected to the axis of the rotating disk (11). The two parallel sides of the cutter holder (21) are respectively provided with a first positioning block (212) and a second positioning block (213). The rotating disk (11) is provided with a first sliding groove (111) that cooperates with the first positioning block (212). The mounting disk (12) is provided with a second sliding groove (121) that cooperates with the second positioning block (213). The first positioning block (212) is slidably mounted in the first sliding groove (111), and the second positioning block (213) is slidably mounted in the second sliding groove (121).

8. An extrusion die, characterized in that, The device includes a mold body (7), a mold core (6), and a tube blank cutting device as described in any one of claims 3 to 7. The cutter disc (1) is rotatably connected to the end face of the mold core (6). The mold core (6) is installed in the mold body (7). The end face of the mold core (6) connected to the cutter disc (1) is located outside the extrusion port of the mold body (7). The mold core (6) is provided with an installation cavity (61) communicating with the extrusion port. The drive shaft (31) and the rotating shaft (322) are slidably installed in the installation cavity (61). The drive device (321) is installed on the mold body (7).

9. The extrusion die according to claim 8, characterized in that, The drive shaft (31) is provided with a positioning section (313), the axial section of the positioning section (313) is polygonal, the limiting surface is the side of the positioning section (313), and the mounting cavity (61) fits against the limiting surface.

10. The extrusion die according to claim 8, characterized in that, It also includes a bearing (5). The cutter head (1) is provided with a bearing (5) fixing groove on the side opposite to the mold core (6). The outer ring of the bearing (5) is fixedly installed in the bearing (5) fixing groove, and the inner ring of the bearing (5) is fixedly sleeved on the mold core (6).

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