A pretreatment device for polyolefin powder

Abstract

This utility model belongs to the field of polyolefin production technology, specifically relating to a polyolefin powder pretreatment device, including a first external pipe, a first half-section pipe section on the outside of the first external pipe, and a second external pipe inside the first half-section pipe section. This utility model, through the design of components such as the first half-section pipe section, the second half-section pipe section, a handle, a first cutter, and a first limiting block, features a keyed hole on the flanged top cover, allowing for detachment without removing all fixing bolts. A single person can remove the top cover to clear irregularly shaped materials using the handle, without the need for special tools. The cutter is fixed by a positioning hole and can be moved out with the irregularly shaped material after the upper and lower covers are separated. If the cutter is stuck and cannot be separated, a spare cutter can be used. Two vertically arranged cutters are more effective at clearing irregularly shaped materials than a single cutter. The two ends of the device can serve as powder inlet and outlet, allowing for easy interchangeability during actual installation, significantly reducing disassembly and installation time and effectively minimizing the impact of disassembly and assembly on reaction discharge.

Description

Technical Field

[0001] This utility model relates to the field of polyolefin production technology, specifically to a polyolefin powder pretreatment device. Background Technology

[0002] Polyolefin powder pretreatment equipment focuses on the "raw material pretreatment stage" of the polyolefin industry chain and is a key equipment branch connecting polyolefin polymerization production and downstream product processing. In the gas-phase polyethylene chemical production, the polyethylene powder generated by the polymerization reaction is sent to the degassing chamber for degassing via a PDS conveyor system, and then conveyed to the screw conveyor via a rotary feeder to mix with additives from the additive system before entering the extrusion granulation system for granulation. However, in the existing technology, the existing polyolefin powder pretreatment equipment, commonly known as a reducer, consists of two flanges, a section of pipe, and a single-edged cutter welded inside the reducer. It is heavy, difficult to disassemble, and difficult to clean when irregularly shaped materials cover the cutter. The cutter cannot be reused, the installation of the polyolefin powder pretreatment equipment has front-to-back directional requirements, the entire disassembly process is time-consuming, and it is very easy to affect the discharge. Therefore, improvements are needed. Utility Model Content

[0003] The purpose of this utility model is to provide a polyolefin powder pretreatment device, which solves the problems of existing polyolefin powder pretreatment devices, commonly known as reducers, which consist of two flanges, a section of pipe, and a single-edged cutter welded inside the reducer. These devices are heavy, difficult to disassemble, difficult to clean after irregularly shaped materials are covered with the cutter, and the cutter cannot be reused. The installation of the polyolefin powder pretreatment device has requirements for the front and back directions, the entire disassembly process is time-consuming, and it is very easy to affect the material discharge.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a polyolefin powder pretreatment device, comprising a first outer pipe, a first half-section pipe section disposed on the outer side of the first outer pipe, a second outer pipe disposed inside the first half-section pipe section, a second half-section pipe section disposed on the outer side of the second outer pipe, the second half-section pipe section contacting the first half-section pipe section, a first outer pipe disposed inside the second half-section pipe section, a first cutter disposed inside the first half-section pipe section, a first cutter disposed inside the second half-section pipe section, and a second cutter disposed inside the first half-section pipe section. The second half-section of the pipe is equipped with a second cutting blade inside. A first limiting block is provided on the outer side of the first half-section of the pipe, and a second limiting block is provided on the outer side of the second half-section of the pipe. A first flange is fixedly connected to the outer side of the first half-section of the pipe, and a second flange is fixedly connected to the outer side of the second half-section of the pipe. A threaded rod is in contact with the inner side of the second flange. The threaded rod is in contact with the first flange. A nut is threadedly connected to the outer side of the threaded rod. Nuts are in contact with the outer sides of both the first flange and the second flange. A limiting mechanism is provided on the outer sides of both the first flange and the second flange.

[0005] Preferably, the outer section of the first half-section pipe segment is connected to a handle, which is made of iron. By designing the handle to be made of iron, the handle becomes more durable.

[0006] Preferably, the limiting mechanism includes an annular groove. The nut has an annular groove inside, and a slider is slidably connected inside the annular groove. A support ring is fixedly connected to the end of the slider away from the annular groove. Connecting seats are fixedly connected to the outer sides of both the first and second flanges. A sliding groove is formed inside the connecting seat, and a pull rod is slidably connected inside the connecting seat. A spring is provided on the outer side of the pull rod. The connecting seat is slidably connected to the slider. By pulling the slider to a designated position, installing the nut onto the threaded rod at a designated position, and then moving the slider into the annular groove, the nut is limited, preventing it from loosening after prolonged use.

[0007] Preferably, a pull rod is fixedly connected to the side of the support ring away from the slider, and a pull block is fixedly connected to the end of the pull rod away from the support ring. By designing the pull block, the pull rod can be moved.

[0008] Preferably, a guide block is slidably connected inside the sliding groove, and the guide block is fixedly connected to the support ring. By designing the guide block, the support ring can be guided.

[0009] Preferably, one end of the spring is fixedly connected to the support ring, and the other end of the spring is fixedly connected to the connecting seat. By designing the spring, the support ring has an elastic force.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. This utility model designs components such as an annular groove, slider, support ring, pull rod, pull block and connecting seat. The slider is pulled to a designated position, and then the nut is installed on the designated position on the threaded rod. Then the slider is moved into the annular groove, thereby limiting the nut and preventing the nut on the device from loosening after long-term use.

[0012] 2. This utility model, through the design of components such as a first half-section pipe section, a second half-section pipe section, a handle, a first cutter, and a cutter and a first limiting block, etc., has a key-shaped hole on the upper cover flange, which can be detached without removing all the fixing bolts. A single person can remove the upper cover to clean irregular materials by using the handle, without special tools. The cutter is fixed by the positioning hole. After the upper and lower covers are separated, it can be moved out with the irregular materials. If the cutter is stuck and cannot be separated, a spare cutter can be replaced. The two vertically arranged cutters are more effective at cleaning irregular materials than a single cutter. The two ends of the device can be used as powder inlet and outlet, and can be switched at will during actual installation. The disassembly and installation time is greatly reduced, which can effectively reduce the impact of disassembly and assembly on the reaction discharge. Attached Figure Description

[0013] Figure 1 This is a front sectional view of the structure of this utility model;

[0014] Figure 2 This utility model Figure 1 Side sectional view;

[0015] Figure 3 This utility model Figure 2 Enlarged view of point A.

[0016] In the diagram: 11. First outer pipe fitting; 12. Second outer pipe fitting; 21. First half-section pipe segment; 22. Second half-section pipe segment; 3. Handle; 41. First cutter; 42. Second cutter; 51. First limiting block; 52. Second limiting block; 61. First flange; 62. Second flange; 7. Threaded rod; 8. Nut; 9. Limiting mechanism; 91. Annular groove; 92. Slider; 93. Support ring; 94. Pull rod; 95. Pull block; 96. Connecting seat; 97. Sliding groove; 98. Guide block; 99. Spring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Please see Figures 1-3A pretreatment device for polyolefin powder includes a first outer pipe 11, a first half-section pipe section 21 disposed on the outer side of the first outer pipe 11, a second outer pipe 12 disposed inside the first half-section pipe section 21, a second half-section pipe section 22 disposed on the outer side of the second outer pipe 12, the second half-section pipe section 22 contacting the first half-section pipe section 21, the first outer pipe 11 disposed inside the second half-section pipe section 22, a handle 3 connected to the outer pipe section of the first half-section pipe section 21, the handle 3 being made of iron, the handle 3 being made of iron to make the handle 3 more durable, a first cutter 41 disposed inside the first half-section pipe section 21, and a first cutter 41 disposed inside the second half-section pipe section 22. The interior of the semi-slit pipe section 21 is provided with a second cutter 42, the interior of the second semi-slit pipe section 22 is provided with a second cutter 42, the outer side of the first semi-slit pipe section 21 is provided with a first limiting block 51, the outer side of the second semi-slit pipe section 22 is provided with a second limiting block 52, the outer side of the first semi-slit pipe section 21 is fixedly connected with a first flange 61, the outer side of the second semi-slit pipe section 22 is fixedly connected with a second flange 62, the interior of the second flange 62 is in contact with a threaded rod 7, the threaded rod 7 is in contact with the first flange 61, the outer side of the threaded rod 7 is connected with a nut 8 by a thread, the outer sides of both the first flange 61 and the second flange 62 are in contact with the nut 8, and the outer sides of both the first flange 61 and the second flange 62 are provided with a limiting mechanism 9.

[0019] Please see Figure 2 , Figure 3 The limiting mechanism 9 includes an annular groove 91. The nut 8 has an annular groove 91 inside. A slider 92 is slidably connected inside the annular groove 91. A support ring 93 is fixedly connected to the end of the slider 92 away from the annular groove 91. A pull rod 94 is fixedly connected to the side of the support ring 93 away from the slider 92. A pull block 95 is fixedly connected to the end of the pull rod 94 away from the support ring 93. By designing the pull block 95, the pull rod 94 can be moved. Connecting seats 96 are fixedly connected to the outer sides of the first flange 61 and the second flange 62. A sliding groove 97 is opened inside the connecting seat 96. A guide block 98 is slidably connected inside the sliding groove 97. The guide block 98 is fixedly connected to the support ring 93. By designing the guide block 98, the support ring 93 can be guided.

[0020] Please see Figure 2 , Figure 3 The connecting seat 96 has a sliding connection to a pull rod 94 inside, and a spring 99 is provided on the outside of the pull rod 94. One end of the spring 99 is fixedly connected to the support ring 93, and the other end of the spring 99 is fixedly connected to the connecting seat 96. By designing the spring 99, the support ring 93 has an elastic force. The connecting seat 96 is slidably connected to the slider 92. By pulling the slider 92 to the designated position, the nut 8 is installed on the designated position on the threaded rod 7. Then the slider 92 is moved into the annular groove 91, thereby limiting the nut 8 and preventing the nut 8 on the device from loosening after long-term use.

[0021] The specific implementation process of this utility model is as follows: Before the device is used, pull the pull block 95 to move away from the connecting seat 96. The movement of the pull block 95 drives the pull rod 94 to move. The movement of the pull rod 94 drives the support ring 93 to move. The movement of the support ring 93 drives the guide block 98 and the slider 92 to move. The movement of the support ring 93 compresses the spring 99. After the slider 92 moves to the designated position, the threaded rod 7 is inserted into the designated position in the first flange 61 and the second flange 62. Then, the nut 8 is moved to drive the annular groove 91 to move towards the threaded rod 7. After the nut 8 moves to the designated position on the threaded rod 7, the nut 8 is rotated to cause threaded movement with the threaded rod 7, thereby causing the nut 8 to produce relative displacement. After the nut 8 rotates to the designated position, the pull block 95 is released. The elastic force of the spring 99 pushes the support ring 93 to move. The movement of the support ring 93 drives the slider 92 and other components to move. The slider 92 moves into the annular groove 91, thereby limiting the nut 8 and preventing the nut 8 on the device from loosening after long-term use.

[0022] When the device is in use, polyethylene powder enters from the front. Part of the irregularly shaped material mixed in the powder is blocked by the first cutter 41, and part is blocked by the second cutter 42. The polyethylene powder then enters the subsequent system along the end of the device. When both cutters are full of irregularly shaped material, the system will detect a significant increase in the pressure difference between the two ends of the device. At this point, the operator stops the delivery of polyethylene powder, and on-site personnel disassemble the device. During disassembly, first remove the nut 8, and the first half-section pipe section 21 can be detached. Maintenance personnel can move the first half-section pipe section 21 using the handle 3. After the first half-section pipe section 21 and the second half-section pipe section 22 are separated, the first cutter 41 and the second cutter 42 can be removed from the device along with the irregularly shaped material. If the cutters are stuck to the irregularly shaped material and cannot be separated in a short time, new spare first cutter 41 and second cutter 42 can be installed to restore normal operation of the device. The polyethylene irregularly shaped material stuck to the cutters should then be promptly removed, and the cutters after removing the irregularly shaped material can be used as spares for the next operation.

[0023] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A polyolefin powder pretreatment device comprising a first external pipe (11), characterized in that: A first half-section pipe section (21) is provided on the outer side of the first outer pipe section (11). A second outer pipe section (12) is provided inside the first half-section pipe section (21). A second half-section pipe section (22) is provided on the outer side of the second outer pipe section (12). The second half-section pipe section (22) is in contact with the first half-section pipe section (21). The first outer pipe section (11) is provided inside the second half-section pipe section (22). A first cutter (41) is provided inside the first half-section pipe section (21). A first cutter (41) is provided inside the second half-section pipe section (22). A second cutter (42) is provided inside the first half-section pipe section (21). A second cutter (42) is provided inside the second half-section pipe section (22). A first limiting block (51) is provided on the outer side of the first half-section pipe segment (21), and a second limiting block (52) is provided on the outer side of the second half-section pipe segment (22). A first flange (61) is fixedly connected to the outer side of the first half-section pipe segment (21), and a second flange (62) is fixedly connected to the outer side of the second half-section pipe segment (22). A threaded rod (7) is in contact with the inner side of the second flange (62). The threaded rod (7) is in contact with the first flange (61). A nut (8) is threadedly connected to the outer side of the threaded rod (7). The nuts (8) are in contact with the outer sides of both the first flange (61) and the second flange (62). A limiting mechanism (9) is provided on the outer side of both the first flange (61) and the second flange (62).

2. A polyolefin powder pretreatment apparatus according to claim 1, characterized in that: The outer section of the first half-section pipe segment (21) is connected to a handle (3), which is made of iron.

3. A polyolefin powder pretreatment apparatus according to claim 1, characterized in that: The limiting mechanism (9) includes an annular groove (91). The nut (8) has an annular groove (91) inside. A slider (92) is slidably connected inside the annular groove (91). A support ring (93) is fixedly connected to one end of the slider (92) away from the annular groove (91). A connecting seat (96) is fixedly connected to the outer side of the first flange (61) and the second flange (62). A sliding groove (97) is opened inside the connecting seat (96). A pull rod (94) is slidably connected inside the connecting seat (96). A spring (99) is provided on the outer side of the pull rod (94). The connecting seat (96) is slidably connected to the slider (92).

4. The polyolefin powder pretreatment device according to claim 3, characterized in that: A pull rod (94) is fixedly connected to the side of the support ring (93) away from the slider (92), and a pull block (95) is fixedly connected to the end of the pull rod (94) away from the support ring (93).

5. A polyolefin powder pretreatment apparatus according to claim 3, characterized in that: The sliding groove (97) is internally slidably connected to a guide block (98), which is fixedly connected to a support ring (93).

6. A polyolefin powder pretreatment apparatus according to claim 3, characterized in that: One end of the spring (99) is fixedly connected to the support ring (93), and the other end of the spring (99) is fixedly connected to the connecting seat (96).

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