A molten mixing device for processing plastic products

Abstract

The utility model discloses a kind of melting mixing devices for plastic product processing, including mixing shaft, multiple blades are equipped with outside mixing shaft, moving device is arranged outside mixing shaft, protective device is connected with the top of mixing shaft, protective device includes control sleeve, displacement spring, clamping groove, connecting rod, displacement sleeve, connecting sleeve, displacement slot, clamping block, displacement block and card frame, displacement spring is connected with clamping block and displacement block, clamping groove is opened in the outside of connecting rod, displacement sleeve outer wall is connected with the inner wall of control sleeve by thread, displacement slot is opened in connecting sleeve, clamping block is arranged in one side of card frame, locking mechanism is installed in the outside of connecting sleeve, and locking mechanism includes rotary hole, rotating plate, sliding sleeve, movable spring, fixed block, movable block and support rod, rotary hole is opened on rotating plate, support rod is connected in one side of sliding sleeve, the utility model solves the technical defects of existing equipment in cleaning maintenance difficulty, power transmission system lacks effective protection and adjustable overload protection mechanism poor stability etc.

Description

Technical Field

[0001] This utility model relates to the field of plastic product melt mixing technology, and more specifically, it relates to a melt mixing device for processing plastic products. Background Technology

[0002] In the field of plastic product manufacturing, melt mixing is a key process to ensure product uniformity and quality stability. However, there are many technical bottlenecks in the equipment design that urgently need to be addressed, which seriously restricts the industry's technological progress and product quality improvement.

[0003] Modern plastics processing places stringent requirements on melt mixing equipment. However, existing melt mixing equipment exhibits several serious shortcomings during use. The primary problem is the difficulty of cleaning and maintaining the mixing drum. Traditional equipment typically employs a one-piece, sealed structure with limited internal space and a complex design. The limited number and small size of openings prevent operators from directly accessing most of the drum's inner wall. This design makes cleaning after each production run extremely difficult. As production cycles lengthen, the accumulated plastic residue on the drum wall not only affects the purity and color of subsequent batches but also reduces mixing efficiency and can even trigger localized overheating, decomposition, or cross-linking reactions, severely impacting the physical properties and appearance of the final product. This difficulty in cleaning and maintenance significantly increases the time and labor costs of production changeovers and directly restricts the company's ability to accept multi-variety, small-batch orders and its market responsiveness, becoming a major bottleneck hindering the improvement of production efficiency and product quality in plastics processing enterprises.

[0004] Secondly, existing melt mixing equipment suffers from serious safety hazards and reliability defects in its power transmission system design. Most equipment employs a direct-drive structure, lacking effective protection mechanisms. This design is highly susceptible to catastrophic consequences when faced with abnormal situations such as high-viscosity materials or foreign matter contamination. When the mixing blades encounter resistance exceeding their design load, the enormous torque is directly transmitted to the connection between the mixing shaft and the motor, leading to metal fatigue fracture or keyway deformation at the connection point. More seriously, continuous overload conditions cause the motor to operate above its rated power for extended periods, resulting in a rapid increase in winding temperature, ultimately leading to serious accidents such as insulation breakdown, short circuits, and even fires. Such equipment failures not only incur high maintenance and parts replacement costs but also cause prolonged production line shutdowns. This directly impacts companies' production plans and delivery cycles. Although some manufacturers have recognized this problem and added overload protection devices to their equipment, these protection systems often use fixed threshold designs and cannot be adjusted according to different mixing formulations and material characteristics. For example, mixing high-viscosity engineering plastics requires higher overload tolerance, while low-viscosity general-purpose plastics require more sensitive protection responses. Furthermore, during the mixing of composite materials containing reinforcing fibers or mineral fillers, the instantaneous resistance fluctuates greatly, requiring special overload judgment logic. This lack of flexibility in protection design leads to either over-protection causing frequent shutdowns or insufficient protection failing to effectively prevent equipment damage, severely limiting the applicability and production efficiency of the equipment, becoming a major concern for plastic processing companies when selecting equipment.

[0005] Furthermore, in response to the aforementioned problems, some equipment manufacturers have attempted to introduce adjustable overload protection mechanisms. However, these improvements often fail to fundamentally solve the problem and may even introduce new technical risks: First, the mechanism is constantly exposed to vibrations generated by high-speed rotation. These vibrations can cause the adjustment structure to loosen, leading to an unnoticed shift in the carefully adjusted protection threshold. Second, the instantaneous impact forces generated during equipment start-up and shutdown can further exacerbate this shift, thus affecting the actual overload protection level. This unpredictable change in the protection threshold may, on the one hand, lead to protection failure, causing the equipment to continue operating in a dangerous state until serious damage occurs; on the other hand, it may also cause overprotection, resulting in frequent interruptions to the production process that should be running normally, seriously affecting production efficiency and product quality stability. Utility Model Content

[0006] (a) Technical problems to be solved

[0007] In view of the problems existing in the prior art, the present invention provides a melt mixing device for processing plastic products to solve the technical problems mentioned in the background art.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, this utility model provides the following technical solution: a melting and mixing device for processing plastic products, comprising a mixing shaft, multiple blades on the outer side of the mixing shaft, a moving device on the outer side of the mixing shaft, and a protective device connected to the top of the mixing shaft. The protective device includes a control sleeve, a shifting spring, a slot, a connecting rod, a shifting sleeve, a connecting sleeve, a shifting groove, a locking block, a shifting block, and a locking bracket. The control sleeve is rotatably mounted on the outer side of the connecting sleeve. The two ends of the shifting spring are respectively connected to the locking block and the shifting block. The slot is formed on the outer side of the connecting rod. The connecting rod is fixedly connected to the top of the mixing shaft. The outer wall of the shifting sleeve is movably connected to the inner wall of the control sleeve via threads. The movable sleeve is fitted on the outside of the connecting rod. The displacement groove is opened in the connecting sleeve. The locking block is movably disposed on one side of the locking frame. The displacement block is movably disposed in the displacement groove. One end of the locking frame is inserted into the locking groove. A locking mechanism is installed on the outside of the connecting sleeve. The locking mechanism includes a rotating hole, a rotating plate, a sliding sleeve, a movable spring, a fixed block, a movable block, and a support rod. The rotating hole is opened on the rotating plate. The rotating plate is rotatably installed on the outside of the connecting sleeve. The sliding sleeve is slidably fitted on the outside of the connecting sleeve. The two ends of the movable spring are respectively connected to two adjacent movable blocks. Multiple fixed blocks are fixedly installed on the outside of the connecting sleeve. The movable block is movably disposed on one side of the control sleeve. The support rod is fixedly connected to one side of the sliding sleeve.

[0010] The present invention is further configured such that the moving device includes a lifting motor, a fixed frame, a lifting frame, a mounting frame, and a lead screw. The lifting motor is detachably mounted on the top of the fixed frame, and the output end of the lifting motor is connected to the top of the lead screw. The fixed frame is detachably mounted on one side of the mounting frame. The lifting frame is movably connected to the lead screw via a thread, and the lead screw is rotatably mounted inside the fixed frame.

[0011] The present invention is further configured such that a slide rail is detachably provided on one side of the fixed frame, and the lifting frame is slidably connected to the slide rail.

[0012] The present invention is further configured such that a mixing cylinder is detachably provided inside the mounting frame, and a mixing motor is detachably provided on one side of the lifting frame, with the output end of the mixing motor connected to the top of the connecting sleeve.

[0013] The present invention is further configured such that a movable wheel is rotatably provided on one side of the movable block, and the movable wheel is engaged with two corresponding fixed blocks. The provision of the movable wheel ensures the smooth movement of the movable block.

[0014] The present invention is further configured such that a sliding groove is provided on the side wall of the connecting sleeve, and a slider is slidably disposed in the sliding groove. The inner wall of the shifting sleeve is fixedly connected to the shifting block through the slider. The arrangement of the slider and the sliding groove ensures the precise linkage between the shifting sleeve and the shifting block.

[0015] The present invention is further configured such that a movable groove is provided in the movable block, and a plurality of movable rails are fixedly provided on one side of the control sleeve. The movable rails are adapted to the movable groove, and the arrangement of the movable rails and the movable groove ensures the precise displacement of the movable block.

[0016] The present invention is further configured such that a support spring is movably sleeved on the outside of the support rod, and one end of the support spring is connected in contact with the rotating plate. The support spring ensures the stable reset of the sliding sleeve.

[0017] (III) Beneficial Effects

[0018] Compared with the prior art, the present invention provides a melt mixing device for processing plastic products, which has the following advantages:

[0019] 1. The mobile device, through the ingenious combination of a lifting motor, fixed frame, lifting frame, mounting frame, and lead screw, achieves the lifting control function of the mixing shaft and blades. This design allows the mixing shaft and blades to be lifted above the mixing drum after mixing, making it easy to remove the mixing drum from the mounting frame. This facilitates operators to directly and thoroughly clean the inner wall of the mixing drum from all angles, and also allows for thorough cleaning of the outer walls of the mixing shaft and blades. This effectively solves the pain point of difficult cleaning and maintenance of traditional equipment. The design of this mobile device not only significantly reduces the time and labor costs of equipment maintenance, but also improves the enterprise's responsiveness to multi-variety, small-batch orders by simplifying the production conversion process. It plays a key role in improving the production efficiency and product quality of plastic processing enterprises.

[0020] 2. The protective device, through the precise coordination of components such as the control sleeve, shift spring, slot, connecting rod, shift sleeve, connecting sleeve, shift groove, slot, shift block, shift block, and bracket, constructs an overload protection system. This design not only solves the safety hazard of the lack of effective protection in traditional direct-connection structures, but also achieves precise adjustment of the overload protection threshold through the threaded connection between the shift sleeve and the control sleeve, as well as the linkage between the slider and the shift block. This allows the equipment to flexibly set appropriate protection parameters according to different mixing formulas and material characteristics, avoiding frequent shutdowns caused by overprotection and preventing equipment damage caused by insufficient protection. This significantly expands the applicability of the equipment and provides plastic processing enterprises with more reliable and flexible production assurance.

[0021] 3. The locking mechanism, through the ingenious collaboration of components such as rotating holes, rotating plates, sliding sleeves, movable springs, fixed blocks, movable blocks, and support rods, provides a reliable guarantee for the stability of the overload protection threshold after adjustment. After adjustment, the support rod provides limiting support to the sliding sleeve, which in turn limits the movable wheel, completely locking the entire adjustment mechanism. This multi-locking design effectively prevents the adjustment structure from loosening due to vibrations generated during high-speed rotation and impacts during start-up and shutdown. It ensures that the carefully adjusted protection threshold remains stable during long-term use, maintaining the preset protection parameters regardless of the working conditions. This fundamentally solves the technical defects of poor stability in traditional adjustable overload protection mechanisms, providing a reliable guarantee for the long-term stable operation of the equipment and significantly improving the adaptability and production efficiency of the melting and mixing device in the processing of different materials. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a melt mixing device for processing plastic products according to this utility model;

[0023] Figure 2 This is a schematic diagram of the overall structure from a second perspective in this utility model;

[0024] Figure 3 This is a schematic diagram of the dispersed structure of the protective device and locking mechanism in this utility model;

[0025] Figure 4 This is a schematic cross-sectional view of the protective device and locking mechanism of the present invention, with the connecting rod removed.

[0026] Figure 5 This is a cross-sectional structural diagram of the protective device and locking mechanism in this utility model.

[0027] In the diagram: 1. Mixing shaft; 2. Blade; 3. Control sleeve; 4. Shifting spring; 5. Slot; 6. Connecting rod; 7. Shifting sleeve; 8. Connecting sleeve; 9. Shifting groove; 10. Locking block; 11. Shifting block; 12. Locking bracket; 13. Rotating hole; 14. Rotating plate; 15. Sliding sleeve; 16. Movable spring; 17. Fixed block; 18. Movable block; 19. Support rod; 20. Lifting motor; 21. Fixed frame; 22. Lifting frame; 23. Mounting frame; 24. Lead screw; 25. Slide rail; 26. Mixing cylinder; 27. Mixing motor; 28. Movable wheel; 29. ​​Slide groove; 30. Slider; 31. Movable groove; 32. Movable rail; 33. Support spring. Detailed Implementation

[0028] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] In this utility model, unless otherwise stated, the orientations used, such as "up" and "down", usually refer to the direction shown in the accompanying drawings, or to the vertical, perpendicular, or gravitational direction; similarly, for ease of understanding and description, "left" and "right" usually refer to the left and right shown in the accompanying drawings; "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0031] Please see Figures 1-5 A melting and mixing device for processing plastic products includes a mixing shaft 1, with multiple blades 2 on the outer side of the mixing shaft 1. A moving device is also provided on the outer side of the mixing shaft 1. A protective device is connected to the top of the mixing shaft 1. The protective device includes a control sleeve 3, a shifting spring 4, a slot 5, a connecting rod 6, a shifting sleeve 7, a connecting sleeve 8, a shifting groove 9, a locking block 10, a shifting block 11, and a bracket 12. The control sleeve 3 is rotatably mounted on the outer side of the connecting sleeve 8. The two ends of the shifting spring 4 are respectively connected to the locking block 10 and the shifting block 11. The slot 5 is opened on the outer side of the connecting rod 6. The connecting rod 6 is fixedly connected to the top of the mixing shaft 1. The outer wall of the shifting sleeve 7 is movably connected to the inner wall of the control sleeve 3 through threads. The connecting sleeve 8 is movably sleeved on the outer side of the connecting rod 6. The shifting groove 9 is opened on the outer side of the connecting rod 6. In the connecting sleeve 8, the locking block 10 is movably disposed on one side of the card holder 12, the shifting block 11 is movably disposed in the shifting groove 9, one end of the card holder 12 is inserted into the card groove 5, and a locking mechanism is installed on the outside of the connecting sleeve 8. The locking mechanism includes a rotating hole 13, a rotating plate 14, a sliding sleeve 15, a movable spring 16, a fixed block 17, a movable block 18, and a support rod 19. The rotating hole 13 is opened on the rotating plate 14, and the rotating plate 14 is rotatably installed on the outside of the connecting sleeve 8. The sliding sleeve 15 is slidably sleeved on the outside of the connecting sleeve 8. The two ends of the movable spring 16 are respectively connected to two adjacent movable blocks 18. Multiple fixed blocks 17 are fixedly installed on the outside of the connecting sleeve 8. The movable block 18 is movably disposed on one side of the control sleeve 3, and the support rod 19 is fixedly connected to one side of the sliding sleeve 15.

[0032] The moving device includes a lifting motor 20, a fixed frame 21, a lifting frame 22, a mounting frame 23, and a lead screw 24. The lifting motor 20 is detachably mounted on the top of the fixed frame 21, and the output end of the lifting motor 20 is connected to the top of the lead screw 24. The fixed frame 21 is detachably mounted on one side of the mounting frame 23. The lifting frame 22 is movably connected to the lead screw 24 through a thread, and the lead screw 24 is rotatably mounted inside the fixed frame 21.

[0033] The fixed frame 21 is detachably equipped with a slide rail 25 on one side, and the lifting frame 22 is slidably connected to the slide rail 25.

[0034] The mixing cylinder 26 is detachably provided inside the mounting bracket 23, and the mixing motor 27 is detachably provided on one side of the lifting frame 22. The output end of the mixing motor 27 is connected to the top of the connecting sleeve 8.

[0035] In this embodiment, when the equipment is needed, the molten plastic product is first slowly added to the mixing cylinder 26. The mixing motor 27 is turned on, and then the mixing motor 27 drives the connecting sleeve 8 connected to the output end to rotate. The connecting sleeve 8 then drives the inner displacement groove 9 to rotate, and then the displacement groove 9 drives the locking block 10 and the locking bracket 12 to rotate. Then the locking bracket 12 drives the connecting rod 6 to rotate through the cooperation with the locking groove 5. Then the connecting rod 6 drives the mixing shaft 1 to rotate, so that the mixing shaft 1 drives multiple blades 2 to rotate, thereby achieving mixing. During mixing, two separate semi-circular cylinder covers can be installed on the top of the mixing cylinder 26. After mixing is completed, the lifting motor 20 can be turned on and the mixing motor 27 can be turned off. Then the lifting motor 20 drives the lead screw 24 to rotate. Since the lifting frame 22 and the lead screw 24 are connected by threads, and the slide rail 25 limits the lifting frame 22, the lifting frame 22 will move along the slide rail 25. The mixing motor 27, mixing shaft 1, and blades 2 rise, causing mixing shaft 1 and blades 2 to rise above mixing cylinder 26. Then, mixing cylinder 26 is removed from mounting bracket 23, and the mixed plastic products can be poured out of mixing cylinder 26. It is also convenient to clean the inner wall of mixing cylinder 26 separately, as well as the outer wall of mixing shaft 1 and blades 2. When blades 2 encounter excessive resistance, the resistance is transmitted to connecting rod 6 through mixing shaft 1. Then, the slot 5 on the outside of connecting rod 6 presses against the end of card holder 12. Due to the rounded corner design of the end of card holder 12 and slot 5, one end of card holder 12 slides out of slot 5, and the other end of card holder 12 presses against card block 10, pushing card block 10 downward. Then, card block 10 slides downward along displacement groove 9, and card block 10 cooperates with displacement block 11 to press against displacement spring 4, causing mixing motor 27 to drive connecting sleeve 8 and other components to idle, thereby achieving overload protection.

[0036] Please see Figures 3-5 As a further implementation of the overall device: a movable wheel 28 is provided on one side of the movable block 18, and the movable wheel 28 is engaged between the corresponding two fixed blocks 17.

[0037] The side wall of the connecting sleeve 8 is provided with a sliding groove 29, and a slider 30 is slidably provided in the sliding groove 29. The inner wall of the shifting sleeve 7 is fixedly connected to the shifting block 11 through the slider 30.

[0038] The movable block 18 has a movable groove 31, and the control sleeve 3 has multiple movable rails 32 fixed on one side, which are adapted to the movable groove 31.

[0039] A spring 33 is movably sleeved on the outside of the support rod 19, and one end of the spring 33 is connected to the rotating plate 14 in contact.

[0040] More specifically, when it is necessary to adapt and adjust the overload protection threshold, firstly rotate the rotating plate 14 so that the rotating plate 14 drives the rotating hole 13 to rotate to a position concentric with the support rod 19. Then push the sliding sleeve 15 so that the sliding sleeve 15 drives the support rod 19 to slide into the rotating hole 13, and the sliding sleeve 15 and the rotating plate 14 cooperate to compress the support spring 33. Then the sliding sleeve 15 no longer limits the movable wheel 28. Then rotate the control sleeve 3 in the forward direction so that the control sleeve 3 drives the movable block 18 to rotate through the movable rail 32 and the movable groove 31. Then the movable block 18 drives the movable wheel 28 to roll out between the corresponding two fixed blocks 17. Then the movable wheel 28 drives the... The movable block 18 slides outward along the movable rail 32 and the movable groove 31, and the movable block 18 drives the movable spring 16 to stretch outward. At the same time, since the inner wall of the control sleeve 3 and the outer wall of the shift sleeve 7 are connected by threads, the shift sleeve 7 drives the slider 30 to slide along the slide groove 29. Then the slider 30 drives the shift block 11 to slide along the shift groove 9. Then the distance between the shift block 11 and the locking block 10 shortens, so that the shift block 11 and the locking block 10 cooperate to squeeze the shift spring 4, which increases the thrust exerted by the shift spring 4 on the locking block 10. Then the thrust exerted by the locking block 10 on the card holder 12 increases, so that the end of the card holder 12 needs to withstand greater force. The resistance required for the mechanism to slide out of the slot 5 is greater than the resistance required for triggering. To adjust the mechanism to require less resistance for triggering, simply rotate the control sleeve 3 in the opposite direction. Once the appropriate trigger threshold is reached, stop rotating the control sleeve 3 and allow the movable rail 32 to engage with the movable groove 31, moving the movable block 18 between the two corresponding fixed blocks 17. Then, the movable spring 16 resets, pulling the movable block 18 inward along the movable rail 32 and the movable groove 31. The movable block 18 then drives the movable wheel 28 inward, causing it to engage between the two corresponding fixed blocks 17. Finally, release the sliding sleeve 15 and release the spring. 33 pushes the sliding sleeve 15 to slide and reset, and the sliding sleeve 15 will drive the support rod 19 to slide and reset. When the support spring 33 is fully reset, the support rod 19 no longer limits the rotation hole 13. Then the rotating plate 14 is rotated again, so that the rotating plate 14 drives the rotation hole 13 to rotate to a position that does not correspond to the support rod 19. Then the support rod 19 limits and supports the sliding sleeve 15, so that the sliding sleeve 15 cannot slide. Then the inner wall of the sliding sleeve 15 limits the outer wall of the movable wheel 28 again, so that the movable wheel 28 and the movable block 18 cannot slide outward, thereby limiting the rotation of the control sleeve 3, thus ensuring the structural stability after the trigger threshold is adjusted, and ensuring the stable operation of the mixed work.

[0041] In summary, when using or operating the equipment: First, slowly add the molten plastic product into the mixing drum 26. Turn on the mixing motor 27. The mixing motor 27 then drives the connecting sleeve 8 connected to the output end to rotate. The connecting sleeve 8 then drives the inner displacement groove 9 to rotate. The displacement groove 9 then drives the locking block 10 and the locking bracket 12 to rotate. The locking bracket 12, through its cooperation with the locking groove 5, drives the connecting rod 6 to rotate. The connecting rod 6 then drives the mixing shaft 1 to rotate, causing the mixing shaft 1 to drive multiple blades 2 to rotate, thus achieving mixing. During mixing, two separate semi-circular cylindrical covers can be installed on the top of the mixing drum 26. After mixing is complete, turn on the lifting motor 20 and turn off the mixing motor 27. The lifting motor 20 then drives the lead screw 24 to rotate. Because the lifting frame 22 and the lead screw 24 are connected by threads, and the slide rail 25 limits the lifting frame 22, the lifting frame 22 will move along... The slide rail 25 rises, driving the mixing motor 27, mixing shaft 1, and blades 2 to rise above the mixing cylinder 26. The mixing cylinder 26 is then removed from the mounting bracket 23, allowing the mixed plastic products to be poured out. This facilitates separate cleaning of the inner wall of the mixing cylinder 26, as well as the outer walls of the mixing shaft 1 and blades 2. When blades 2 encounter excessive resistance, the resistance is transmitted to the connecting rod 6 via the mixing shaft 1. The slot 5 on the outer side of the connecting rod 6 then presses against the end of the bracket 12. Due to the rounded corner design of the end of the bracket 12 and the slot 5, one end of the bracket 12 slides out of the slot 5, while the other end of the bracket 12 presses against the block 10, pushing the block 10 downward. The block 10 then slides downward along the shifting groove 9, and the block 10 cooperates with the shifting block 11 to press against the shifting spring 4, causing the mixing motor 27 to drive the connecting sleeve 8 and other components to idle, thus achieving overload protection.

[0042] When the overload protection threshold needs to be adjusted, first rotate the rotating plate 14 so that the rotating plate 14 drives the rotating hole 13 to rotate to a position concentric with the support rod 19. Then push the sliding sleeve 15 so that the sliding sleeve 15 drives the support rod 19 to slide into the rotating hole 13, and the sliding sleeve 15 and the rotating plate 14 cooperate to compress the support spring 33. Then the sliding sleeve 15 no longer limits the movable wheel 28. Then rotate the control sleeve 3 in the forward direction so that the control sleeve 3 drives the movable block 18 to rotate through the movable rail 32 and the movable groove 31. Then the movable block 18 drives the movable wheel 28 to roll out between the two corresponding fixed blocks 17. Then the movable wheel 28 drives the movable block 18 to rotate. 8 slides outward along the movable rail 32 and movable groove 31, and the movable block 18 will drive the movable spring 16 to stretch outward. At the same time, since the inner wall of the control sleeve 3 and the outer wall of the shift sleeve 7 are connected by threads, the shift sleeve 7 will drive the slider 30 to slide along the slide groove 29. Then the slider 30 will drive the shift block 11 to slide along the shift groove 9. Then the distance between the shift block 11 and the locking block 10 will shorten, so that the shift block 11 and the locking block 10 will cooperate to squeeze the shift spring 4, which will increase the thrust exerted by the shift spring 4 on the locking block 10. Then the thrust exerted by the locking block 10 on the card holder 12 will increase, so that the end of the card holder 12 needs to withstand greater resistance. Only when the sliding sleeve 3 slides out of the slot 5 can the protection mechanism be triggered with greater resistance. When the protection mechanism needs to be adjusted to be triggered with less resistance, simply rotate the control sleeve 3 in the opposite direction. After adjusting to the appropriate trigger threshold, stop rotating the control sleeve 3 and let the movable rail 32 cooperate with the movable groove 31 to move the movable block 18 between the two corresponding fixed blocks 17. Then, the movable spring 16 resets and pulls the movable block 18 to slide inward along the movable rail 32 and the movable groove 31. Then, the movable block 18 drives the movable wheel 28 to slide inward and make the movable wheel 28 engage between the two corresponding fixed blocks 17. Then, release the sliding sleeve 15 and the spring 3. 3. Push the sliding sleeve 15 to slide and reset, and the sliding sleeve 15 will drive the support rod 19 to slide and reset. When the support spring 33 is fully reset, the support rod 19 no longer limits the rotation hole 13. Then rotate the rotating plate 14 again, so that the rotating plate 14 drives the rotation hole 13 to rotate to a position that does not correspond to the support rod 19. Then the support rod 19 limits and supports the sliding sleeve 15, so that the sliding sleeve 15 cannot slide. Then the inner wall of the sliding sleeve 15 limits the outer wall of the movable wheel 28 again, so that the movable wheel 28 and the movable block 18 cannot slide outward, thereby limiting the rotation of the control sleeve 3, thus ensuring the structural stability after the trigger threshold is adjusted, and ensuring the stable operation of the mixed work.

[0043] Of all the solutions mentioned above, those involving the connection between two components can be selected according to the actual situation, such as welding, bolt and nut connection, bolt or screw connection, or other known connection methods, which will not be elaborated here. For all the fixed connections mentioned above, welding is preferred. Although embodiments of this utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this utility model. The scope of this utility model is defined by the appended claims and their equivalents.

Claims

1. A melt mixing device for processing plastic products, comprising a mixing shaft (1), wherein a plurality of blades (2) are provided on the outer side of the mixing shaft (1), characterized in that: A moving device is provided on the outside of the mixing shaft (1), and a protective device is connected to the top of the mixing shaft (1). The protective device includes a control sleeve (3), a shift spring (4), a slot (5), a connecting rod (6), a shift sleeve (7), a connecting sleeve (8), a shift groove (9), a locking block (10), a shift block (11), and a bracket (12). The shift spring (4) is connected to the locking block (10) and the shift block (11). The slot (5) is opened on the outside of the connecting rod (6). The outer wall of the shift sleeve (7) is connected to the inner wall of the control sleeve (3) by threads. The shift groove (9) is opened in the connecting sleeve (8). The locking block (10) is set on one side of the bracket (12). The positioning block (11) is set in the displacement groove (9), and a locking mechanism is installed on the outside of the connecting sleeve (8). The locking mechanism includes a rotating hole (13), a rotating plate (14), a sliding sleeve (15), a movable spring (16), a fixed block (17), a movable block (18), and a support rod (19). The rotating hole (13) is opened on the rotating plate (14), the rotating plate (14) is installed on the outside of the connecting sleeve (8), the sliding sleeve (15) is sleeved on the outside of the connecting sleeve (8), the movable spring (16) is connected to two adjacent movable blocks (18), multiple fixed blocks (17) are installed on the outside of the connecting sleeve (8), and the support rod (19) is connected to one side of the sliding sleeve (15).

2. The melt mixing apparatus for processing plastic products according to claim 1, characterized in that: The moving device includes a lifting motor (20), a fixed frame (21), a lifting frame (22), a mounting frame (23), and a lead screw (24). The lifting motor (20) is detachably mounted on the top of the fixed frame (21). The output end of the lifting motor (20) is connected to the top of the lead screw (24). The fixed frame (21) is detachably mounted on one side of the mounting frame (23). The lifting frame (22) is movably connected to the lead screw (24) by a thread. The lead screw (24) is rotatably mounted inside the fixed frame (21).

3. The melt mixing apparatus for processing plastic products according to claim 2, characterized in that: The fixed frame (21) is detachably provided with a slide rail (25) on one side, and the lifting frame (22) is slidably connected to the slide rail (25).

4. The melt mixing apparatus for processing plastic products according to claim 3, characterized in that: The mounting bracket (23) is detachably equipped with a mixing cylinder (26) on its inner side, and the lifting frame (22) is detachably equipped with a mixing motor (27) on one side. The output end of the mixing motor (27) is connected to the top of the connecting sleeve (8).

5. A melt mixing apparatus for processing plastic products according to any one of claims 1-4, characterized in that: The movable block (18) has a movable wheel (28) on one side that rotates, and the movable wheel (28) is engaged between two corresponding fixed blocks (17).

6. The melt mixing apparatus for processing plastic products according to claim 1, characterized in that: The connecting sleeve (8) has a sliding groove (29) on its side wall, and a slider (30) is slidably provided in the sliding groove (29). The inner wall of the shift sleeve (7) is fixedly connected to the shift block (11) through the slider (30).

7. The melt mixing apparatus for processing plastic products according to claim 5, characterized in that: The movable block (18) has a movable groove (31), and the control sleeve (3) has multiple movable rails (32) fixed on one side, which are adapted to the movable groove (31).

8. The melt mixing apparatus for processing plastic products according to claim 7, characterized in that: A spring (33) is movably sleeved on the outside of the support rod (19), and one end of the spring (33) is connected to the rotating plate (14) in contact.

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