An extrusion die on-line switching device

Abstract

This invention provides an online extrusion die switching device, belonging to the field of thermoforming extruder technology. It includes an extruder with a frame slidably connected to its upper surface. Two symmetrically arranged rotating shafts are provided between the frame and the extruder. Two symmetrically arranged corresponding grooves are formed on the opposite sidewalls of both the frame and the extruder. The guide shaft mates with the corresponding grooves. A die cavity is provided on the opposite sidewalls of both the frame and the extruder. A conveyor box is provided on one side of the extruder. A multi-layer positioning frame is installed in the feeding box as a storage structure for the die cores. Combined with a multi-angle, height-adjustable lifting frame and lifting rod, the corresponding die cores can be picked up and placed. With the help of conveying rollers and placement frames, convenient loading and unloading of die cores can be achieved, reducing the loading steps and ensuring die core stability. Simultaneously, the placement frames on both sides separate and convey combined die cores, enabling separate loading of die cores on both sides, ensuring safe and stable die core loading.

Description

Technical Field

[0001] This invention relates to the field of extrusion thermoforming extruder technology, and more particularly to an online extrusion die switching device. Background Technology

[0002] As a key piece of equipment in the plastic product manufacturing process, the extrusion molding machine heats and melts plastic raw materials, and then uses a screw to push them through a specific mold to extrude and form plastic products of various shapes.

[0003] The diverse production demands of plastic products often necessitate the replacement of extrusion dies to meet the production requirements of different products. However, existing extrusion die replacement technologies have several drawbacks, as follows:

[0004] 1. Complex replacement operation: The traditional extrusion die replacement process involves many cumbersome steps. The molding machine must be stopped first, and then each connecting part of the die, such as cooling water pipes, heating lines, fixing bolts, etc., must be disassembled one by one before the die can be removed. When installing a new die, the above steps must be repeated in reverse. The whole process is complicated, requires a high level of technical proficiency from the operators, and consumes a lot of time and energy.

[0005] 2. Safety of hoisting, transportation, and installation cannot be guaranteed: Currently, most mold transportation and installation are carried out using hoisting methods. During hoisting, due to the irregular shape of the mold, it is difficult to accurately determine the lifting point, which can easily lead to the mold shaking, tilting, or even falling off during transportation, posing a serious threat to the lives of operators and equipment. Furthermore, the operation of hoisting equipment requires professional personnel, increasing labor costs and operational risks.

[0006] 3. Safety and stability of mold conveying process cannot be guaranteed: During the process of transporting the mold from the storage location to the molding machine installation location, the existing conveying method cannot ensure that the mold is always in a stable state. The mold may collide or shift due to factors such as road bumps and vibration of conveying equipment, which may cause damage to the mold surface and loosening of internal parts, affecting the accuracy and service life of the mold, and thus affecting the quality of plastic products. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides an online extrusion die switching device. This invention can pick up and drop materials for the corresponding die cores. In conjunction with the conveyor rollers and the placement frame, it can achieve convenient loading and unloading of die cores, reducing the loading steps of the die cores.

[0008] To solve the above problems, the technical solution adopted by the present invention is as follows:

[0009] An online extrusion die switching device includes an extruder. A frame is slidably connected to the upper end face of the extruder. Two symmetrically arranged rotating shafts are provided between the frame and the extruder. Two symmetrically arranged corresponding grooves are opened on the opposite side walls of the frame and the extruder. A guide shaft mates with the corresponding grooves. A die cavity is provided on the opposite side walls of the frame and the extruder. A conveyor box is provided on one side of the extruder. A feeding box is fixedly connected to one side of the conveyor box. Multiple conveying rollers are rotatably connected inside the conveyor box. Multiple equally spaced positioning frames are fixedly connected inside the feeding box. Multiple mating grooves are opened on the upper end face of the positioning frame. A die cavity is provided on the upper end face of the positioning frame. The mold core is rotatably connected to the feeding box, and a lifting frame is threadedly connected to the side wall of the lifting screw. The upper end face of the lifting frame is provided with a material picking mechanism for picking up the mold core. The feeding box is provided with a driving mechanism for moving the lifting frame. The bottom of the conveying box has two symmetrically arranged sliding grooves. Two symmetrically arranged toothed plates are slidably connected in the sliding grooves. One end of the toothed plate is fixedly connected to a placement frame. The conveying box is provided with a traction mechanism for moving and pulling the placement frame. The conveying box is provided with a guiding mechanism for moving and guiding the mold core. A moving frame is slidably connected in the placement frame. A double-headed threaded rod is rotatably connected in the two placement frames.

[0010] Preferably, the material handling mechanism includes two lifting rods slidably connected to the upper end face of the lifting frame, two symmetrically arranged lifting hydraulic cylinders fixedly connected to the lower end face of the lifting frame, lifting plates fixedly connected to the telescopic ends of the two lifting hydraulic cylinders, rotating seats fixedly connected to the upper end face of the lifting plate and the lower end face of the lifting rods, a propulsion hydraulic cylinder rotatably connected between the two rotating seats on the same side, and multiple sliding rods fixedly connected to the lower end face of the lifting frame, with the lifting plate slidably connected to the multiple sliding rods.

[0011] Preferably, the driving mechanism includes a lifting motor fixedly connected to the upper end face of the feeding box, a rotating frame fixedly connected to the output shaft of the lifting motor, a lifting screw rotatably connected to the rotating frame, a mounting frame fixedly connected to the side wall of the lifting screw, two symmetrically arranged guide rods fixedly connected between the rotating frame and the mounting frame, the guide rods slidably connecting the lifting frame and the lifting plate, a rotating motor fixedly connected to the inner bottom of the feeding box, a one-way bearing fixedly connected to the output shaft of the rotating motor, and the lifting screw extending into the one-way bearing.

[0012] Preferably, the traction mechanism includes a drive motor fixedly connected to one side of the conveyor box, the output shaft of the drive motor fixedly connected to a conveyor roller on one side, a contact sleeve rotatably connected to the side wall of the conveyor roller on one side, two symmetrically arranged connecting gears fixedly connected to the side wall of the conveyor roller on one side, the connecting gears meshing with a toothed plate, and multiple support rods fixedly connected to the side of the conveyor box near the extruder, the multiple support rods slidingly connecting the two placement frames.

[0013] Preferably, the guiding mechanism includes two symmetrically arranged rotating slots on both sides of the placement frame, a guide plate is rotatably connected in the rotating slot, and a torsion spring is fixedly connected to the guide plate and the opposite side wall of the rotating slot.

[0014] Preferably, the sidewall of the double-ended threaded rod is threaded with two symmetrically arranged separation frames, and two symmetrically arranged connecting rods are fixedly connected through the two placement frames. Both of the movable frames and the separation frames are slidably connected to the sidewalls of the two connecting rods.

[0015] Preferably, an adjusting motor is fixedly connected to the lower end face of the side placement frame, and a drive gear is fixedly connected to both the output shaft of the adjusting motor and the side wall of the double-threaded rod. A drive groove is opened at the bottom of the placement frame, and two drive gears mesh with each other. The drive gears pass through the drive groove, and the transmission ratio of the two gears is 2:1.

[0016] Preferably, the inner wall of the conveying box is fixedly connected to two symmetrically arranged fixed frames, and a support rod is rotatably connected inside the fixed frame. Guide grooves are opened on opposite sides of the two support rods, and multiple guide rollers are rotatably connected inside the guide grooves. The inner wall of the conveying box is fixedly connected to two symmetrically arranged connecting pipes, and a connecting spring is fixedly connected inside the connecting pipe. The end of the connecting spring away from the connecting pipe is fixedly connected to the guide frame.

[0017] The beneficial effects of this invention are as follows:

[0018] 1. The present invention is provided with a conveyor box, a feeding box, a conveyor roller, a lifting frame, a lifting screw, a positioning frame, and a lifting rod. By setting up a multi-layer positioning frame in the feeding box as a storage structure for the mold core, and with the lifting frame and lifting rod that can be adjusted at multiple angles and heights, the corresponding mold core can be picked up and put in. With the conveyor roller and the placement frame, the mold core can be conveniently loaded and unloaded, reducing the loading steps of the mold core.

[0019] 2. The present invention is equipped with a double-headed threaded rod, a placement frame, a moving frame, a separating frame, a toothed plate, a connecting gear, an adjusting motor, and a drive gear. With the help of the conveying roller and the drive of the double-headed threaded rod, the stability of the mold core can be ensured during the conveying process. At the same time, the placement frames on both sides separate and convey the combined mold core, which can realize the separate feeding of the mold core on both sides and ensure the safety and stability of the mold core feeding. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the extruder structure of an online extrusion die switching device according to the present invention.

[0021] Figure 2 This is a schematic diagram of the feeding box structure of an online switching device for extrusion dies according to the present invention.

[0022] Figure 3 This is a schematic diagram of the drive mechanism of an online switching device for extrusion dies according to the present invention.

[0023] Figure 4 For the present invention Figure 2 Enlarged schematic diagram of the structure at point A in the middle.

[0024] Figure 5 This is a schematic diagram of the side structure of the conveyor box of an online extrusion die switching device according to the present invention.

[0025] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at point B in the middle.

[0026] Figure 7 This is a schematic diagram of the bottom structure of an online extrusion die switching device according to the present invention.

[0027] Figure 8 for Figure 7 Enlarged schematic diagram of the structure at point C.

[0028] Figure 9 This is a schematic diagram of the guide frame structure of an online switching device for extrusion dies according to the present invention.

[0029] In the diagram: 1. Extruder; 2. Frame; 3. Mold cavity; 4. Rotating shaft; 5. Corresponding groove; 6. Conveyor box; 7. Feeding box; 8. Conveyor roller; 9. Positioning frame; 10. Mating groove; 11. Lifting screw; 12. Lifting motor; 13. Rotating frame; 14. Guide rod; 15. Mounting frame; 16. One-way bearing; 17. Rotating motor; 18. Lifting frame; 19. Lifting rod; 20. Lifting hydraulic cylinder; 21. Lifting plate; 22. Sliding rod; 23. Rotating seat; 24. Propulsion. 25. Hydraulic cylinder; 26. Fixed frame; 27. Guide frame; 28. Guide groove; 29. ​​Guide roller; 20. Connecting pipe; 31. Connecting spring; 32. Sliding groove; 33. Tooth plate; 34. Contact sleeve; 35. Connecting gear; 36. Placement frame; 37. Support rod; 38. Drive motor; 39. Double-ended threaded rod; 40. Connecting rod; 41. Separation frame; 42. Mold core; 43. Rotating groove; 44. Guide plate; 45. Moving frame; 46. Adjusting motor; 47. Drive gear. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] See attached document Figure 1 - Appendix Figure 9 An online extrusion die switching device includes an extruder 1, a frame 2 slidably connected to the upper end face of the extruder 1, two symmetrically arranged rotating shafts 4 between the frame 2 and the extruder 1, two symmetrically arranged corresponding grooves 5 on the opposite side walls of the frame 2 and the extruder 1, a guide shaft cooperating with the corresponding grooves 5, a die cavity 3 on the opposite side walls of the frame 2 and the extruder 1, a conveying box 6 on one side of the extruder 1, a feeding box 7 fixedly connected to one side of the conveying box 6, multiple conveying rollers 8 rotatably connected inside the conveying box 6, multiple equally spaced positioning frames 9 fixedly connected inside the feeding box 7, multiple mating grooves 10 on the upper end face of the positioning frame 9, a die core 41 on the upper end face of the positioning frame 9, a lifting screw 11 rotatably connected inside the feeding box 7, and a lifting frame 18 threadedly connected to the side wall of the lifting screw 11.

[0032] Among them, such as Figure 2 As shown, the mating groove 10 is mated with the lifting rod 19, and the lifting rod 19 can slide through the mating groove 10 to remove the mold core 41 on the positioning frame 9. The feeding box 7 and the conveying box 6 are in a connected state. At the same time, the conveying box 6 is provided with two notches at the feeding port of the feeding box 7. The two notches correspond to the spacing of the two lifting rods 19, which is used to avoid interference during the feeding process of the lifting rods 19.

[0033] The upper end face of the lifting frame 18 is provided with a material picking mechanism for picking up the mold core 41. The material picking mechanism includes two lifting rods 19 slidably connected to the upper end face of the lifting frame 18. Two symmetrically arranged lifting hydraulic cylinders 20 are fixedly connected to the lower end face of the lifting frame 18. Lifting plates 21 are fixedly connected to the telescopic ends of the two lifting hydraulic cylinders 20. Rotating seats 23 are fixedly connected to the upper end face of the lifting plate 21 and the lower end face of the lifting rods 19. A propulsion hydraulic cylinder 24 is rotatably connected between the two rotating seats 23 on the same side. Multiple sliding rods 22 are fixedly connected to the lower end face of the lifting frame 18. The lifting plate 21 is slidably connected to the multiple sliding rods 22.

[0034] Among them, such as Figure 4 The lifting plate 21 shown is not connected to the lifting screw 11. It can move up and down by the extension and retraction of the lifting hydraulic cylinder 20. During the up and down movement, it can provide angle and height adjustment for the extension and retraction of the propulsion hydraulic cylinder 24, which facilitates the propulsion of the lifting rod 19. At the same time, it can strengthen the lifting rod 19 after it comes into contact with the mold core 41, and maintain the stability of the mold core 41.

[0035] The feeding box 7 is equipped with a drive mechanism for moving the lifting frame 18. The drive mechanism includes a lifting motor 12 fixedly connected to the upper end face of the feeding box 7. The output shaft of the lifting motor 12 is fixedly connected to a rotating frame 13. The lifting screw 11 is rotatably connected to the rotating frame 13. The side wall of the lifting screw 11 is fixedly connected to a mounting frame 15. Two symmetrically arranged guide rods 14 are fixedly connected between the rotating frame 13 and the mounting frame 15. The guide rods 14 are slidably connected to the lifting frame 18 and the lifting plate 21. The inner bottom of the feeding box 7 is fixedly connected to a rotating motor 17. The output shaft of the rotating motor 17 is fixedly connected to a one-way bearing 16. The lifting screw 11 extends into the one-way bearing 16.

[0036] Among them, the lifting motor 12 serves as the rotation drive for the lifting frame 18, and the rotating motor 17 serves as the movement drive for the lifting frame 18. Both the lifting motor 12 and the rotating motor 17 are servo motors, and their rotation is set and controlled by a PLC control device.

[0037] The conveyor box 6 has two symmetrically arranged sliding grooves 31 at its bottom. Two symmetrically arranged toothed plates 32 are slidably connected in the sliding grooves 31. One end of the toothed plate 32 is fixedly connected to a placement frame 35. The conveyor box 6 is equipped with a traction mechanism for moving and pulling the placement frame 35. The traction mechanism includes a drive motor 37 fixedly connected to one side of the conveyor box 6. The output shaft of the drive motor 37 is fixedly connected to a side conveyor roller 8. A contact sleeve 33 is rotatably connected to the side wall of the side conveyor roller 8. Two symmetrically arranged connecting gears 34 are fixedly connected to the side wall of the side conveyor roller 8. The connecting gears 34 mesh with the toothed plates 32. Multiple support rods 36 are fixedly connected to the side of the conveyor box 6 near the extruder 1. The multiple support rods 36 all slide through and connect the two placement frames 35.

[0038] The surface roughness of the contact sleeve 33 is greater than that of the conveying roller 8, which can maintain the contact stability when the mold core 41 is separated from it. When the mold core 41 is on the contact sleeve 33, the drive motor 37 drives the conveying roller 8 as follows: Figure 6 The direction shown is counterclockwise rotation. At this time, the conveying roller 8 and the die core 41 are in the same feeding direction. At this time, the connecting gear 34 and the toothed plate 32 are engaged and can slide in the sliding groove 31. This can drive the placement frame 35 and the separation frame 40 to approach the contact sleeve 33 and approach the die core 41, which facilitates the docking and feeding process. After the die core and the contact sleeve 33 are disengaged, the drive motor 37 is driven in the opposite direction, which can drive the die core 41 and the placement frame 35 to move towards the extruder 1.

[0039] The inner wall of the conveyor box 6 is fixedly connected to two symmetrically arranged fixed frames 25. The fixed frames 25 are rotatably connected to support rods 36. The opposite sides of the two support rods 36 are provided with guide grooves 27. Multiple guide rollers 28 are rotatably connected in the guide grooves 27. The inner wall of the conveyor box 6 is fixedly connected to two symmetrically arranged connecting pipes 29. The connecting pipes 29 are fixedly connected to connecting springs 30. The end of the connecting springs 30 away from the connecting pipes 29 is fixedly connected to the guide frame 26.

[0040] The conveyor box 6 is provided with a guide mechanism for moving the mold core 41. The guide mechanism includes two symmetrically arranged rotating grooves 42 on both sides of the placement frame 35. A guide plate 43 is rotatably connected in the rotating groove 42. A torsion spring is fixedly connected to the opposite side wall of the guide plate 43 and the rotating groove 42. A movable frame 44 is slidably connected in the placement frame 35.

[0041] Two placement racks 35 are rotatably connected to a double-ended threaded rod 38. An adjusting motor 45 is fixedly connected to the lower end face of one placement rack 35. The output shaft of the adjusting motor 45 and the side wall of the double-ended threaded rod 38 are both fixedly connected to a drive gear 46. A drive groove is opened at the bottom of the placement rack 35. The two drive gears 46 mesh and pass through the drive groove. The transmission ratio of the two drive gears 46 is 2:1. Two symmetrically arranged separation racks 40 are threadedly connected to the side wall of the double-ended threaded rod 38. Two symmetrically arranged connecting rods 39 are fixedly connected through the two placement racks 35. The two movable racks 44 and the separation racks 40 are slidably connected to the side walls of the two connecting rods 39.

[0042] The double-threaded rod 38 has threads on both sides that rotate in opposite directions, which drives the two separating frames 40 on both sides to move relative to each other. The transmission ratio of the two drive gears 46 is 2:1 between the drive gear 46 on the lower drive gear 46 and the drive gear 46 on the double-threaded rod 38, which can ensure the rotation speed of the double-threaded rod 38 and improve the conveying efficiency.

[0043] When using this invention, as Figure 1-9As shown, firstly, the corresponding mold core 41 is placed on the positioning frame 9 for positioning and coding. When the corresponding mold core 41 needs to be selected, the equipment picks up the mold core 41 according to the coding identification position. During the picking process, the rotating motor 17 drives the lifting screw 11 to rotate. With the support of the rotating frame 13, guide rod 14, and mounting frame 15, the lifting screw 11 drives the lifting frame 18 to move up and down in the feeding box 7. According to the coding position of the corresponding mold core 41, it is adjusted to the corresponding height (the operation of the lifting motor 12 and the rotating motor 17 can be controlled by a PLC, and the positioning of the mold core 41 is achieved by an infrared sensor). Then, the rotating motor 17 is started according to the location of the required mold core 41. At this time, the rotating motor 17 drives the rotating frame 13 to rotate, and the rotating frame drives the guide rod 14 and the mounting frame 15 to rotate synchronously. Under the action of bearing 16, lifting screw 11 can rotate independently of rotating motor 17. At this time, after lifting frame 18 rotates to the corresponding angle, lifting hydraulic cylinder 20 extends and retracts, driving lifting plate 21 to move upward. At this time, under the rotational connection of rotating seat 23, it can provide an upward angle for propulsion hydraulic cylinder 24. At this time, propulsion hydraulic cylinder 24 extends and drives lifting rod 19 to move towards mold core 41. After moving to the corresponding length, lifting rod 19 corresponds to mating groove 10. Then rotating motor 17 drives lifting frame 18 to move upward as a whole. After passing through mating groove 10, the two lifting rods 19 contact the lower end face of mold core 41 and lift mold core 41 away from positioning frame 9. Then lifting motor 12 starts and drives lifting frame 18 to rotate to the side close to conveyor box 6. Then rotating motor 17 drives lifting frame 18 to move downward, and the two lifting plates 21 and... Figure 2 The two notches of the conveyor box 6 shown are fitted together, and at this time the mold core 41 is placed on the conveyor roller 8;

[0044] Multiple conveying rollers 8 are activated to drive the movement of the mold core 41. During the process of the mold core 41 moving and feeding in the conveying box 6, the guide frames 26 on both sides can rotate within the fixed frame 25 to adjust the guide position and angle. At this time, multiple guide rollers 28 located in the guide groove 27 roll into contact with the side wall of the mold core 41. Under the elastic support of the connecting pipe 29 and the connecting spring 30, the mold core 41 can be kept in the center position of the conveying box 6 during the feeding process, thus achieving the positioning and guiding effect of the mold core 41 during the feeding process.

[0045] Subsequently, the core 41 is conveyed to two separating frames 40. The process involves the core passing on the conveyor rollers 8, being conveyed to contact the separating frames 40, then separating from the conveyor rollers 8, and finally being completely on the separating frames 40. During this process, the drive motor 37 drives... Figure 2The rightmost conveyor roller 8 rotates, at which time the connecting gear 34 on the side wall of the conveyor roller 8 meshes with the toothed plate 32. Under the sliding limit of the sliding groove 31, it can drive the toothed plates 32 on both sides to move synchronously. Under the push of the toothed plate 32 and the sliding support of multiple support rods 36, it can drive the placement frame 35 to move towards the extruder 1. During this process, the adjusting motor 45 drives the lower drive gear 46 to rotate. The lower drive gear 46 meshes with the drive gear 46 on the side wall of the double-headed threaded rod 38 to drive the double-headed threaded rod 38 to rotate. At this time, the double-headed threaded rod 38 is threadedly connected to the two separation frames 40. Under the guidance of the connecting rod 39, the two separation frames 40 move relative to each other, which can drive the mold core 41 to separate and move with the separation frame 40 to the feeding position on both sides. When the separation frame 40 and the moving frame 44 come into contact and abut, the moving frame 44 and the separation frame 40 move synchronously and provide contact support for the mold core 41 to maintain the stability of the mold core 41.

[0046] During the movement of the placement frame 35, the frame 2 and the extruder 1 move and separate. The conveying box 6 is located in the middle position when the frame 2 and the extruder 1 are in the open state. At this time, multiple support rods 36 are located below the rotating shaft 4, while the placement frame 35 is slidably connected above the rotating shaft 4 and rolls in contact with the rotating shaft 4, which can provide rolling support for the placement frame 35. When the placement frame 35 moves to the position corresponding to the mold cavity 3 and the mold core 41, the mold core 41 can be loaded into the position corresponding to the mold cavity 3 under the drive of the moving frame 44 and the separating frame 40, thus completing the loading process of the mold core 41. The unloading process of the mold core 41 is the reverse of the above steps, thus completing the unloading and loading replacement process of the mold core 41, and thus safely and stably completing the online replacement process of the mold core 41.

[0047] After the die core 41 is loaded, the frame 2 is moved to a position that matches the extruder 1. At this time, the rotating shaft 4 matches the corresponding grooves 5 on both sides, which can avoid interference between the frame 2 and the part that fits with the extruder 1.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An extrusion die on-line switching device comprising an extruder (1), characterized in that, The upper end face of the extruder (1) is slidably connected to a frame (2). Two symmetrically arranged rotating shafts (4) are provided between the frame (2) and the extruder (1). Two symmetrically arranged corresponding grooves (5) are opened on the opposite side walls of the frame (2) and the extruder (1). The quasi-shaft cooperates with the corresponding grooves (5). The opposite side walls of the frame (2) and the extruder (1) are provided with mold cavities (3). A conveying box (6) is provided on one side of the extruder (1). A feeding box (7) is fixedly connected on one side of the conveying box (6). Multiple conveying rollers (8) are rotatably connected inside the conveying box (6). Multiple equally spaced positioning frames (9) are fixedly connected inside the feeding box (7). A mold core (41) is provided on the upper end face of the positioning frame (9). Multiple mating grooves (10) are opened on the upper end face of the positioning frame (9). A lifting screw (11) is rotatably connected inside the feeding box (7). A lifting frame (18) is threadedly connected to the side wall of the lifting screw (11). The upper end face of the lifting frame (18) is provided with a material picking mechanism for picking up the mold core (41), and the loading box (7) is provided with a driving mechanism for moving the lifting frame (18). The conveying box (6) has two symmetrically arranged sliding grooves (31) at its bottom. Two symmetrically arranged toothed plates (32) are slidably connected in the sliding grooves (31). One end of the toothed plate (32) is fixedly connected to a placement frame (35). The conveying box (6) is provided with a traction mechanism for moving and pulling the placement frame (35). The conveying box (6) is provided with a guide mechanism for moving and guiding the mold core (41). A moving frame (44) is slidably connected in the placement frame (35). A double-headed threaded rod (38) is rotatably connected in the two placement frames (35).

2. An in-line switching device for an extrusion die according to claim 1, characterized in that The material handling mechanism includes two lifting rods (19) slidably connected to the upper end face of the lifting frame (18). Two symmetrically arranged lifting hydraulic cylinders (20) are fixedly connected to the lower end face of the lifting frame (18). Lifting plates (21) are fixedly connected to the telescopic ends of the two lifting hydraulic cylinders (20). Rotating seats (23) are fixedly connected to the upper end face of the lifting plate (21) and the lower end face of the lifting rods (19). A propulsion hydraulic cylinder (24) is rotatably connected between the two rotating seats (23) on the same side. Multiple sliding rods (22) are fixedly connected to the lower end face of the lifting frame (18). The lifting plate (21) is slidably connected to the multiple sliding rods (22).

3. An in-line switching device for an extrusion die according to claim 2, characterized in that The driving mechanism includes a lifting motor (12) fixedly connected to the upper end face of the feeding box (7). The output shaft of the lifting motor (12) is fixedly connected to a rotating frame (13). The lifting screw (11) is rotatably connected to the rotating frame (13). The side wall of the lifting screw (11) is fixedly connected to a mounting frame (15). Two symmetrically arranged guide rods (14) are fixedly connected between the rotating frame (13) and the mounting frame (15). The guide rods (14) are slidably connected to the lifting frame (18) and the lifting plate (21). The inner bottom of the feeding box (7) is fixedly connected to a rotating motor (17). The output shaft of the rotating motor (17) is fixedly connected to a one-way bearing (16). The lifting screw (11) extends into the one-way bearing (16).

4. An in-line switching device for an extrusion die according to claim 3, characterized in that The traction mechanism includes a drive motor (37) fixedly connected to one side of the conveyor box (6). The output shaft of the drive motor (37) is fixedly connected to a conveyor roller (8) on one side. A contact sleeve (33) is provided on the side wall of the conveyor roller (8) on one side. Two symmetrically arranged connecting gears (34) are fixedly connected to the side wall of the conveyor roller (8). The connecting gears (34) mesh with the toothed plate (32). Multiple support rods (36) are fixedly connected to the side of the conveyor box (6) near the extruder (1). The multiple support rods (36) all slide through and connect two placement frames (35).

5. An in-line switching device for an extrusion die according to claim 4, characterized in that The guiding mechanism includes two symmetrically arranged rotating slots (42) on both sides of the placement frame (35). A guide plate (43) is rotatably connected in the rotating slot (42). A torsion spring is fixedly connected to the opposite side wall of the guide plate (43) and the rotating slot (42).

6. An in-line switching device for an extrusion die according to claim 5, characterized in that The double-ended threaded rod (38) has two symmetrically arranged separation frames (40) threadedly connected to its side wall. Two symmetrically arranged connecting rods (39) are fixedly connected through the two placement frames (35). The two moving frames (44) and the separation frames (40) are slidably connected to the side walls of the two connecting rods (39).

7. An online extrusion die switching device according to claim 6, characterized in that, An adjustment motor (45) is fixedly connected to the lower end face of a side placement frame (35). The output shaft of the adjustment motor (45) and the side wall of the double-threaded rod (38) are both fixedly connected to drive gears (46). A drive groove is opened at the bottom of the placement frame (35). Two drive gears (46) mesh and pass through the drive groove. The transmission ratio of the two drive gears (46) is 2:

1.

8. An online extrusion die switching device according to claim 7, characterized in that, The inner wall of the conveying box (6) is fixedly connected to two symmetrically arranged fixed frames (25). A guide frame (26) is rotatably connected inside the fixed frame (25). A guide groove (27) is opened on the opposite side of the two guide frames (26). A plurality of guide rollers (28) are rotatably connected inside the guide groove (27). The inner wall of the conveying box (6) is fixedly connected to two symmetrically arranged connecting pipes (29). A connecting spring (30) is fixedly connected inside the connecting pipe (29). The end of the connecting spring (30) away from the connecting pipe (29) is fixedly connected to the guide frame (26).

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