PVC stabilizer screw mixing tank
By introducing a self-locking support mechanism into the PVC stabilizer production equipment, and utilizing the snap-fit structure of the sliding locking plate and the guide limit frame, the problem of accidental closure of the end cap under abnormal conditions was solved, thereby improving safety and production continuity.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANDONG YUEHUI NEW MATERIAL TECH CO LTD
- Filing Date
- 2026-06-02
- Publication Date
- 2026-07-03
AI Technical Summary
In the current PVC stabilizer production process, the end caps are prone to accidental closure under abnormal conditions such as insufficient air pressure, ruptured air pipes, or sudden power or air supply failures, posing a significant safety hazard and increasing equipment maintenance costs and unplanned downtime.
A self-locking support mechanism is adopted, including a sliding locking plate and a guide limit frame. The locking groove and the edge of the guide limit frame are engaged to form a rigid mechanical support, ensuring that the end cover will not close under abnormal conditions and avoiding safety accidents.
It effectively prevents safety accidents caused by accidental closure of the end cap, reduces equipment maintenance costs, and improves the continuous operation efficiency and safety of the production line.
Smart Images
Figure CN224442702U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mixing equipment technology, specifically relating to a screw-type mixing kettle for PVC stabilizers. Background Technology
[0002] Polyvinyl chloride (PVC) heat stabilizers are indispensable additives in PVC processing. Their production requires the precise mixing of various nano- to micron-sized ultrafine powders, such as calcium and zinc stearate, rare earth compounds, lubricants, and antioxidants. Due to the high viscosity of PVC stabilizer powders, their tendency to stick to the walls and clump, and the significant differences in formulations between different products, the mixing vessel end cap needs frequent opening during production for internal cleaning, equipment maintenance, and formulation switching. Therefore, the ease of operation of the end cap opening mechanism is crucial. Currently, the screw-type mixing vessel widely used in the industry typically employs a single-cylinder direct-drive structure for its end cap opening mechanism. One end of the cylinder is hinged to a fixed bracket on the outside of the cylinder, and the other end is hinged to the upper part of the end cap. The extension and retraction of the cylinder piston rod drives the end cap to rotate around the hinge axis, thus opening and closing the end cap.
[0003] However, existing technologies have insurmountable safety hazards and operational defects in the high-frequency end cap operation conditions of PVC stabilizer production: the entire supporting force after the end cap is opened relies entirely on the internal air pressure of the cylinder, without any independent mechanical locking support mechanism. Once there is insufficient air pressure, air pipe rupture, solenoid valve failure, or sudden power or air supply failure, the end cap, weighing hundreds of kilograms, will close rapidly under gravity, which can easily injure operators who are cleaning or repairing the cylinder. At the same time, in order to maintain the reliability of the air circuit system, companies need to frequently inspect and replace vulnerable parts such as cylinder seals, air pipes, and solenoid valves, which significantly increases the maintenance cost of the equipment and unplanned downtime, affecting the continuous operation efficiency of the production line.
[0004] Chinese patent CN204107360U discloses a mixing device with a flip-top cover, including a base and a material cylinder mounted on the base. A cover is hinged to the upper part of the material cylinder. A first cylinder, fixed to the outside of the material cylinder, drives a connecting frame to flip, thus opening and closing the cover. To prevent accidental closure of the cover, the device includes an additional independent second cylinder at the hinge as a locking mechanism. When the cover is fully open, the piston rod of the second cylinder extends and inserts into the positioning hole of the connecting frame to lock it. This patent improves the ease of opening the cover and occupies less space after opening. However, the locking function of this patent relies entirely on the pneumatic pressure of the second cylinder and lacks any independent mechanical self-locking structure. When abnormal situations occur in the production environment, such as insufficient air pressure, air pipe rupture, solenoid valve jamming, or sudden power or air outages, the piston rod of the second cylinder will automatically retract under the action of a return spring, instantly releasing the locked state. For horizontal screw mixers used in PVC stabilizer production, the end caps are quite heavy. If the locking mechanism fails, the end caps will close rapidly under gravity, which could easily injure operators who are cleaning or maintaining the material inside the cylinder, posing a significant safety hazard. Utility Model Content
[0005] The purpose of this invention is to provide a screw-type mixing reactor for PVC stabilizers, which can solve the problem of accidental closure of the end cap when operators enter the cylinder for cleaning and maintenance during PVC stabilizer production, and completely eliminate the major safety hazard of the end cap falling.
[0006] To achieve the above objectives, the technical solution of this utility model is as follows:
[0007] A screw-type mixing vessel for PVC stabilizers includes a horizontal cylindrical body with an inspection port on its cylindrical side wall. An arc-shaped inspection end cap, adapted to the horizontal cylindrical body, is located at the inspection port. The fixed edge of the arc-shaped inspection end cap is hinged to the horizontal cylindrical body. A driving cylinder is located on the outer side of the end of the horizontal cylindrical body. The lower end of the cylinder body is hinged to a fixed bracket at the end of the horizontal cylindrical body, and the upper end of the piston rod of the driving cylinder is hinged to one side of the arc-shaped inspection end cap. The vessel also includes a self-locking support mechanism, comprising a sliding locking plate and a guide limiting frame. The upper end of the sliding locking plate is hinged to the upper end of the piston rod of the driving cylinder. The guide limiting frame is fixed to the cylinder body of the driving cylinder and has a guide hole adapted to the sliding locking plate, through which the sliding locking plate passes. A locking groove is formed on the sliding locking plate, the opening width of which is adapted to the edge thickness of the guide limiting frame.
[0008] Furthermore, the guide limit frame is a square frame structure that surrounds the drive cylinder.
[0009] Furthermore, a gap of 5-10mm is left between the inner wall of the guide hole and the two sides of the sliding locking plate.
[0010] Furthermore, the movable side edge of the arc-shaped inspection end cover is evenly provided with several clamp seats along the axial direction of the horizontal cylinder, and quick clamps adapted to the clamp seats are correspondingly provided on the side wall of the horizontal cylinder.
[0011] Furthermore, a main drive device is provided at one end of the horizontal cylinder. The main drive device includes a main motor and a hardened gear reducer. The output shaft of the main motor is connected to the input shaft of the hardened gear reducer.
[0012] Furthermore, a stirring main shaft is installed inside the horizontal cylinder, and the output shaft of the hardened gear reducer is coaxially connected to the stirring main shaft.
[0013] Furthermore, the stirring main shaft runs horizontally through the interior of the horizontal cylinder, and multiple sets of plow blade stirring arms are spirally arranged along the axial direction on the stirring main shaft, with a plow head fixed at the end of each set of plow blade stirring arms.
[0014] Furthermore, several flying knife assemblies are evenly arranged along the axial direction at the bottom of the horizontal cylinder. Each flying knife assembly includes a flying knife motor and a flying knife head. The flying knife motor is fixed to the outer side of the bottom of the horizontal cylinder, and the output shaft of the flying knife motor extends into the interior of the horizontal cylinder and is fixedly connected to the flying knife head.
[0015] Furthermore, the flying knife head and the plow head are arranged alternately in space.
[0016] Furthermore, the top of the horizontal cylinder is provided with several feed ports evenly distributed along the axial direction, and the bottom of the horizontal cylinder is provided with a discharge port.
[0017] The beneficial effects of this utility model are as follows:
[0018] The sliding locking plate of this invention is hinged to the piston rod of the drive cylinder, and the guide limit frame is fixed to the cylinder body. When the end cover is fully open, simply rotating the sliding locking plate causes the locking groove to engage with the edge of the guide limit frame, thus forming a rigid mechanical support. This rigid mechanical support is unaffected by abnormal operating conditions such as insufficient air pressure, solenoid valve jamming, or sudden power or gas outages. It can stably support the heavy-duty arc-shaped maintenance end cover, preventing major safety accidents caused by the end cover accidentally closing and falling when operators enter the cylinder for cleaning, maintenance, or formula changes. This invention uses a surface contact engagement between the locking groove and the edge of the guide limit frame. Dust accumulation will not affect the reliability of the engagement. When the sliding locking plate moves up and down along the guide hole, it can automatically scrape off the accumulated material inside the hole, eliminating the need for frequent cleaning. This avoids the problems of jamming, inability to extend or retract, caused by dust entering the gap in existing pin-type structures. It has strong adaptability and high locking reliability in high-dust environments. Attached Figure Description
[0019] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;
[0020] Figure 2 This is a schematic diagram of the structure of this utility model, which eliminates the arc-shaped inspection end cap, clamp seat, and quick clamp. Figure 1 ;
[0021] Figure 3 This is a schematic diagram of the structure of this utility model, which eliminates the arc-shaped inspection end cap, clamp seat, and quick clamp. Figure 2 ;
[0022] Figure 4 This is a schematic diagram of the structure of the present invention. Figure 2 ;
[0023] Figure 5 This is a schematic diagram of the structure of this utility model, which eliminates the arc-shaped inspection end cap, clamp seat, and quick clamp. Figure 3 ;
[0024] Figure 6 for Figure 4 Enlarged view of point A in the middle;
[0025] Figure 7 This is a schematic diagram of the sliding locking plate and locking groove in this utility model;
[0026] In the picture:
[0027] 1. Horizontal cylinder; 2. Arc-shaped inspection end cover; 3. Drive cylinder; 4. Fixed bracket; 5. Sliding locking plate; 6. Guide limit frame; 7. Locking slot; 8. Clamp seat; 9. Quick clamp; 10. Main motor; 11. Hardened gear reducer; 12. Flying knife assembly. Detailed Implementation
[0028] The present invention will now be described and illustrated in detail with reference to the embodiments.
[0029] Example 1
[0030] like Figure 1-7As shown, the PVC stabilizer screw mixer includes a horizontal cylindrical body 1. An inspection port is provided on the cylindrical side wall of the horizontal cylindrical body 1, and an arc-shaped inspection end cover 2 adapted to the horizontal cylindrical body 1 is provided at the inspection port. The fixed edge of the arc-shaped inspection end cover 2 is hinged to the horizontal cylindrical body 1. A drive cylinder 3 is provided on the outer side of the end of the horizontal cylindrical body 1. The lower end of the cylinder body of the drive cylinder 3 is hinged to a fixed bracket 4 at the end of the horizontal cylindrical body 1, and the upper end of the piston rod of the drive cylinder 3 is hinged to the arc-shaped inspection end cover 2. The side also includes a self-locking support mechanism, which includes a sliding locking plate 5 and a guide limiting frame 6; the upper end of the sliding locking plate 5 is hinged to the upper end of the piston rod of the drive cylinder 3; the guide limiting frame 6 is fixed to the cylinder body of the drive cylinder 3, and a guide hole adapted to the sliding locking plate 5 is opened on the guide limiting frame 6, and the sliding locking plate 5 passes through the guide hole; a locking groove 7 is opened on the plate body of the sliding locking plate 5, and the opening width of the locking groove 7 is adapted to the edge thickness of the guide limiting frame 6.
[0031] The guide limit frame 6 is a square frame structure that surrounds the drive cylinder 3.
[0032] A gap of 5-10mm is left between the inner wall of the guide hole and the two sides of the sliding locking plate 5.
[0033] The movable side edge of the arc-shaped inspection end cover 2 is evenly provided with several clamp seats 8 along the axial direction of the horizontal cylinder 1, and the side wall of the horizontal cylinder 1 is provided with quick clamps 9 that are adapted to the clamp seats 8.
[0034] One end of the horizontal cylinder 1 is provided with a main drive device, which includes a main motor 10 and a hardened gear reducer 11. The output shaft of the main motor 10 is connected to the input shaft of the hardened gear reducer 11.
[0035] The horizontal cylindrical body 1 is equipped with a stirring main shaft, and the output shaft of the hardened gear reducer 11 is coaxially connected to the stirring main shaft.
[0036] The stirring shaft runs horizontally through the interior of the horizontal cylinder 1. Multiple sets of plow blade stirring arms are spirally arranged along the axial direction on the stirring shaft, and a plow head is fixed at the end of each set of plow blade stirring arms.
[0037] The bottom of the horizontal cylinder 1 is uniformly provided with several flying knife assemblies 12 along the axial direction. Each flying knife assembly 12 includes a flying knife motor and a flying knife head. The flying knife motor is fixed to the outside of the bottom of the horizontal cylinder 1, and the output shaft of the flying knife motor extends into the interior of the horizontal cylinder 1 and is fixedly connected to the flying knife head.
[0038] The throwing knife head and the plow head are arranged alternately in space.
[0039] The top of the horizontal cylinder 1 is provided with several feed ports evenly distributed along the axial direction, and the bottom of the horizontal cylinder 1 is provided with a discharge port.
[0040] Working process and principle:
[0041] I. Mixing Production Process
[0042] The raw materials of the PVC stabilizer to be mixed are fed into the horizontal cylinder 1 in sequence according to a preset ratio through multiple feed ports at the top of the cylinder 1. The main drive device is started, and the main motor 10 runs. The output shaft of the main motor 10 drives the input shaft of the hard-tooth surface reducer 11 to rotate. After reduction and torque amplification, the output shaft of the hard-tooth surface reducer 11 drives the stirring main shaft inside the horizontal cylinder 1 to rotate. The stirring main shaft drives the multiple sets of spirally arranged plow blade stirring arms and plow blade heads to rotate synchronously, simultaneously throwing and turning the material axially and radially.
[0043] The flying knife assembly 12 at the bottom of the horizontal cylinder 1 is started synchronously. The flying knife motor drives the corresponding flying knife head to rotate at high speed, breaking up the agglomerated ultrafine powder and ensuring that all components are fully and evenly mixed. After mixing is completed, the main drive device and all flying knife assemblies 12 are stopped, the discharge port at the bottom of the horizontal cylinder 1 is opened, and the mixed PVC stabilizer product is discharged, completing one production cycle.
[0044] II. Self-locking support process
[0045] When internal cleaning, equipment maintenance, or formula switching is required, disconnect the power to the main motor 10 and all flying knife assemblies 12, and confirm that all moving parts of the equipment have completely stopped operating. Sequentially move all the quick clamps 9 on the side wall of the horizontal cylinder 1 to disengage the quick clamps 9 from the clamp seats 8 on the movable side of the arc-shaped maintenance end cover 2, thereby releasing the sealing and locking state of the arc-shaped maintenance end cover 2.
[0046] Start the drive cylinder 3, and compressed air pushes the piston rod upward. The piston rod of the drive cylinder 3 drives the arc-shaped inspection end cover 2 to rotate upward around the hinge axis on its fixed side, and at the same time drives the sliding locking plate 5, which is hinged to the upper end of the piston rod, to slide upward along the guide hole of the guide limit frame 6.
[0047] When the piston rod of the drive cylinder 3 extends to its maximum stroke, the arc-shaped maintenance end cover 2 rotates to the fully open position. At this time, the hinged end of the sliding locking plate 5 extends above the guide limit frame 6. The operator manually rotates the sliding locking plate 5 so that the locking groove 7 on the sliding locking plate 5 aligns with and engages with the edge of the guide limit frame 6, forming a rigid mechanical support independent of the air circuit system. At this time, even if there are abnormal situations such as insufficient air pressure, solenoid valve jamming, or sudden power or air supply failure, the arc-shaped maintenance end cover 2 will not close unexpectedly under the action of gravity, and the operator can safely enter the horizontal cylinder 1 to carry out operations.
[0048] III. Shutdown Process
[0049] After completing the internal work, the operator exits the horizontal cylinder 1, cleans up all work tools, and confirms that there are no personnel or items left inside the cylinder. The operator then reverses the sliding locking plate 5 to completely disengage the locking groove 7 from the edge of the guide limit frame 6, thus releasing the rigid mechanical support.
[0050] Start the drive cylinder 3; compressed air pulls the piston rod downwards. The piston rod of the drive cylinder 3 causes the arc-shaped inspection end cover 2 to rotate downwards around the hinge axis, simultaneously causing the sliding locking plate 5 to slide downwards and reset along the guide hole of the guide limit frame 6. When the piston rod of the drive cylinder 3 retracts to its minimum stroke, the arc-shaped inspection end cover 2 is completely closed. Sequentially engage all the quick-release clamps 9, causing them to engage with their corresponding clamp seats 8, pressing and sealing the arc-shaped inspection end cover 2.
Claims
1. A PVC stabilizer screw type mixing kettle comprising a horizontal cylinder (1), characterized in that, A maintenance port is provided on the cylindrical side wall of the horizontal cylinder (1), and an arc-shaped maintenance end cover (2) adapted to the horizontal cylinder (1) is provided at the maintenance port; the fixed side edge of the arc-shaped maintenance end cover (2) is hinged to the horizontal cylinder (1); a driving cylinder (3) is provided on the outer side of the end of the horizontal cylinder (1), the lower end of the cylinder body of the driving cylinder (3) is hinged to the fixed bracket (4) at the end of the horizontal cylinder (1), and the upper end of the piston rod of the driving cylinder (3) is hinged to one side of the arc-shaped maintenance end cover (2); a self-locking support mechanism is also included. The support mechanism includes a sliding locking plate (5) and a guide limit frame (6); the upper end of the sliding locking plate (5) is hinged to the upper end of the piston rod of the drive cylinder (3); the guide limit frame (6) is fixed on the cylinder body of the drive cylinder (3), and a guide hole adapted to the sliding locking plate (5) is provided on the guide limit frame (6), and the sliding locking plate (5) passes through the guide hole; a locking groove (7) is provided on the plate body of the sliding locking plate (5), and the opening width of the locking groove (7) is adapted to the edge thickness of the guide limit frame (6).
2. The PVC stabilizer screw mixer of claim 1, wherein, The guide limit frame (6) is a square frame structure that surrounds the drive cylinder (3).
3. The PVC stabilizer screw mixer of claim 1, wherein, A gap of 5-10mm is left between the inner wall of the guide hole and the two sides of the sliding locking plate (5).
4. The PVC stabilizer screw mixer of claim 1, wherein, The movable side edge of the arc-shaped inspection end cover (2) is uniformly provided with several clamp seats (8) along the axial direction of the horizontal cylinder (1), and the side wall of the horizontal cylinder (1) is provided with quick clamps (9) that are compatible with the clamp seats (8).
5. The PVC stabilizer screw mixer of claim 1, wherein, One end of the horizontal cylinder (1) is provided with a main drive device, which includes a main motor (10) and a hardened gear reducer (11). The output shaft of the main motor (10) is connected to the input shaft of the hardened gear reducer (11).
6. The PVC stabilizer screw compounder of claim 5, wherein, The horizontal cylindrical body (1) is equipped with a stirring main shaft, and the output shaft of the hardened gear reducer (11) is coaxially connected to the stirring main shaft.
7. The PVC stabilizer screw compounder of claim 6, wherein, The stirring shaft runs horizontally through the interior of the horizontal cylinder (1). Multiple sets of plow blade stirring arms are spirally arranged along the axial direction on the stirring shaft, and each set of plow blade stirring arms has a plow blade head fixed at its end.
8. The PVC stabilizer screw mixer of claim 7, wherein, The bottom of the horizontal cylinder (1) is uniformly provided with several flying knife assemblies (12) along the axial direction. Each flying knife assembly (12) includes a flying knife motor and a flying knife head. The flying knife motor is fixed to the outside of the bottom of the horizontal cylinder (1), and the output shaft of the flying knife motor extends into the interior of the horizontal cylinder (1) and is fixedly connected to the flying knife head.
9. The PVC stabilizer screw compounder of claim 8, wherein, The throwing knife head and the plow head are arranged alternately in space.
10. The screw-type mixing tank for PVC stabilizer according to claim 1, characterized in that, The top of the horizontal cylinder (1) is provided with several feed ports evenly distributed along the axial direction, and the bottom of the horizontal cylinder (1) is provided with a discharge port.