Heating circulation bin for preparing raw materials of nylon particles

Abstract

The utility model provides a heating circulation bin for preparing raw materials of nylon particles, which relates to the technical field of circulation heating and comprises a fixed base, a circulation heating mechanism is arranged above the fixed base and comprises a heating tank, and the outside of the heating tank is fixedly connected with supporting blocks which are symmetrically distributed. The lower ends of the two supporting blocks are fixedly connected with the upper end of the fixed base, a gear circulating pump in the circulating heating mechanism drives materials to circulate in a reciprocating mode, a dynamic heat exchange environment is constructed, in the circulating stirring mechanism, a servo motor works to enable a spiral scraping blade, stirring blades and a variable-diameter spiral piece to cooperatively operate, the spiral scraping blade scrapes off high-temperature materials on the tank wall, and the stirring efficiency is improved. The stirring blades disturb middle-layer materials, heat transfer is promoted, bottom materials are conveyed upwards through the variable-diameter spiral pieces, alternate circulation of inner-layer materials and outer-layer materials is achieved in cooperation with the gear circulating pump, temperature layering is eliminated, it is guaranteed that nylon raw materials are evenly heated, the carbonization deterioration risk is reduced, and the product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of circulating heating technology, and in particular to a heating circulating chamber for raw materials used in the preparation of nylon particles. Background Technology

[0002] Nylon particles are an important raw material for synthetic fibers and engineering plastics. Their production process requires heating raw materials (such as caprolactam and nylon chips) to a molten state for subsequent extrusion and granulation. Heated circulation chambers are key equipment for the constant-temperature storage, uniform heating, and circulating transport of raw materials. They are mainly used in nylon polymerization production lines and modified granulation lines to ensure that the raw materials maintain fluidity at a stable temperature. Current heating chambers typically heat the raw materials through heating coils within the inner cavity. This method can easily lead to excessively high temperatures near the inner wall of the chamber, while the temperature of the material in the center of the chamber remains low, resulting in uneven heating of the raw materials.

[0003] For example, a heating circulation chamber for preparing nylon particles disclosed in Chinese patent literature (publication number: CN220008444U) allows the collection filter box to be pulled out from the crushing chamber through an installation groove. The filter screen can filter and block the nylon particle raw material. Some nylon particles that are not sized properly can fall onto the crushing filter plate through the filter screen and then be stored. The properly crushed nylon particles will directly enter the heating circulation tank for heating and melting through the crushing filter plate. This can screen out the nylon particles that are not properly crushed and prevent them from entering the heating circulation tank and affecting the heating and melting speed.

[0004] However, simply using a stirring shaft and stirring blades is insufficient to ensure that the molten material flows sufficiently. After the nylon particle raw material melts, the material near the inner wall of the heating circulation tank experiences a rapid temperature rise due to direct contact with the high-temperature wall surface. However, the stirring range of the stirring blades is limited, resulting in insufficient disturbance to the material in the central and wall areas of the tank. The high-temperature material at the wall surface is prone to carbonization and deterioration due to continuous heating and slow flow, which affects product quality. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as the tendency of nylon particle raw materials to carbonize near the wall surface after melting due to continuous heating, which affects product quality.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A heating circulation chamber for raw materials used in the preparation of nylon particles includes a fixed base, and a circulation heating mechanism is disposed above the fixed base.

[0008] The circulating heating mechanism includes a heating tank, with symmetrically distributed support blocks fixedly connected to the outside of the heating tank. The lower ends of both support blocks are fixedly connected to the upper end of the fixed base. A heating cavity is opened inside the heating tank. A feed pipe is fixedly connected to the upper end of the heating tank, and a sealing cap is provided at the upper end of the feed pipe. A discharge pipe is fixedly connected to the lower end of the heating tank, and a diversion pipe is fixedly connected to the lower end of the discharge pipe.

[0009] A circulating stirring mechanism is installed above the heating tank.

[0010] Preferably, a discharge valve is provided on the outside of the diversion pipe, and a gear circulation pump is fixedly installed on the outside of the heating tank, with a connecting pipe fixedly connected to the lower end of the gear circulation pump.

[0011] Preferably, one end of the connecting pipe is fixedly connected to one end of the diversion pipe via a flange, and the upper end of the gear circulation pump is fixedly connected to a conveying pipe, one end of which is fixedly connected to the upper end of the heating tank.

[0012] Preferably, the circulating stirring mechanism includes a servo motor, the output shaft of the servo motor is fixedly mounted with a rotating shaft via a coupling, one end of the rotating shaft is externally fixedly sleeved with a first bevel gear, and the upper inner wall of the heating tank is rotatably connected to a hollow tube via a bearing.

[0013] Preferably, a second bevel gear is fixedly sleeved on the upper end of the hollow tube, the tooth surface of the second bevel gear meshing with the tooth surface of the first bevel gear, and a drive rod is fixedly connected to the lower end of the hollow tube, with a spiral scraper fixedly connected to one end of the drive rod.

[0014] Preferably, the outer surface of the spiral scraper contacts the inner wall of the heating tank, a reinforcing rod is fixedly connected to the outside of the drive rod, one end of the reinforcing rod is fixedly connected to the inner surface of the spiral scraper, and a rotating rod is rotatably connected to the inner wall of the hollow tube through a bearing.

[0015] Preferably, a third bevel gear is fixedly sleeved on the upper end of the rotating rod, the tooth surface of the third bevel gear meshing with the tooth surface of the first bevel gear, stirring blades arranged in a ring array are fixedly connected to the outside of the rotating rod, and a variable diameter spiral blade is fixedly sleeved on the lower end of the rotating rod.

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

[0017] In this invention, the gear-driven circulating pump in the circulating heating mechanism drives the material to circulate back and forth, creating a dynamic heat exchange environment. In the circulating stirring mechanism, the servo motor enables the spiral scraper, stirring blade, and variable-diameter spiral blade to work together. The spiral scraper scrapes down the high-temperature material from the tank wall, preventing local overheating and carbonization. The stirring blade disturbs the material in the middle layer, promoting heat transfer. The variable-diameter spiral blade delivers the material from the bottom layer. Together with the gear-driven circulating pump, the inner and outer layers of material alternately flow, eliminating temperature stratification, ensuring uniform heating of the nylon raw material, reducing the risk of carbonization and deterioration, and improving product quality. Attached Figure Description

[0018] Figure 1 A schematic diagram of the main structure of a heating circulation chamber for preparing nylon particles provided by this utility model;

[0019] Figure 2 A three-dimensional view of the heating tank structure of a heating circulation chamber for preparing nylon particles, provided by this utility model;

[0020] Figure 3 A three-dimensional view of a hollow tube structure for a heating circulation chamber for preparing nylon particles, provided by this utility model;

[0021] Figure 4 A three-dimensional view of the spiral scraper structure of a heating circulation chamber for preparing nylon particles, provided by this utility model.

[0022] Legend: 1. Fixed base; 2. Heating tank; 21. Support block; 22. Heating cavity; 23. Feed pipe; 24. Sealing cover; 25. Discharge pipe; 26. Diverter pipe; 27. Discharge valve; 28. Gear circulation pump; 29. ​​Connecting pipe; 210. Conveying pipe; 3. Servo motor; 31. Rotating shaft; 32. First bevel gear; 33. Hollow tube; 34. Second bevel gear; 35. Drive rod; 36. Spiral scraper; 37. Reinforcing rod; 38. Rotating rod; 39. Third bevel gear; 310. Stirring blade; 311. Variable diameter spiral blade. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0024] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below with reference to relevant embodiments, and several embodiments of this utility model will be given. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this utility model more thorough and complete.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. Example

[0027] like Figure 1-4 As shown, this utility model provides a technical solution: a heating circulation chamber for raw materials used to prepare nylon particles, including a fixed base 1. The fixed base 1 is made of steel structure welded together, providing rigid support for the upper circulation heating mechanism and circulation stirring mechanism. The bottom is pre-set with anchor bolt holes, which can be firmly connected to the ground to ensure the stability of the equipment during operation and avoid the impact of equipment shaking on material circulation and heating uniformity.

[0028] The heating tank 2 of the circulating heating mechanism is made of stainless steel, which has good high temperature resistance and corrosion resistance. The heating chamber 22 inside it has multiple sets of electric heating coils. The temperature is precisely controlled by an external temperature control system to meet the different melting process requirements of nylon raw materials. Since this is an existing mature technology, it will not be described in detail.

[0029] The feed pipe 23 at the top of the heating tank 2 is equipped with a sealing cover 24 to ensure the airtightness when the material is fed in, and to prevent heat loss and moisture absorption of the raw materials. The discharge pipe 25 at the bottom is connected to the diversion pipe 26 and works with the discharge valve 27 to realize the discharge of materials as needed.

[0030] The gear circulation pump 28 outside the heating tank 2 draws material from the bottom of the heating tank through the connecting pipe 29 and returns it to the top of the tank through the conveying pipe 210. The connecting pipe 29 and the conveying pipe 210 are wrapped with heat insulation cotton to effectively prevent heat loss, ensure temperature stability in the material circulation path, and create a dynamic heat exchange environment.

[0031] The servo motor 3 of the circulating stirring mechanism drives the rotating shaft 31 to rotate through a coupling. The first bevel gear 32 on the rotating shaft 31 simultaneously meshes with the second bevel gear 34 and the third bevel gear 39 to form a double-stage bevel gear transmission, realizing the differential rotation of the hollow tube 33 and the rotating rod 38, which can meet the different needs of tank wall scraping and middle layer stirring.

[0032] The lower end of the hollow tube 33 is connected to the drive rod 35. The drive rod 35 drives the spiral scraper 36 to move in a circular motion along the tank wall. The spiral scraper 36 can scrape off the material that is too hot due to contact with the tank wall in time, preventing local overheating and carbonization. The reinforcing rod 37 strengthens the connection between the spiral scraper 36 and the drive rod 35, avoiding structural deformation caused by long-term scraping.

[0033] The stirring blades 310 on the outside of the rotating rod 38 are inclined at 45° and there are 3-4 sets. As the rotating rod rotates at high speed, they shear and disturb the material in the middle layer of the heating tank, break up the thermal stratification, and promote the uniformity of heat transfer.

[0034] The variable diameter spiral blade 311 at the lower end of the rotating rod 38 uses the spiral angle to push the material at the bottom of the heating tank, which has a relatively low temperature and is 5-10°C lower than the upper layer due to the lag in thermal convection, upward, thereby achieving the replacement of the bottom and upper layer materials. In conjunction with the outer layer circulation of the gear circulation pump, the material in the entire tank is alternately transferred.

[0035] The heating tank 2 is equipped with multiple temperature sensors distributed on the tank wall, middle layer and bottom to collect the material temperature in different areas in real time and feed it back to the external temperature control system. Based on the temperature data, the temperature control system automatically adjusts the power of the electric heating coil and the operating parameters of the circulation stirring and pump to achieve closed-loop temperature control and ensure heating uniformity and stability.

[0036] The working process of this utility model:

[0037] Step 1: Open the sealing cover 24 of the feed pipe 23, add the nylon raw material, and then close the sealing cover 24. Start the electric heating coil in the heating chamber 22 to preheat the heating tank 2. Set the target temperature through the external temperature control system. After the electric heating coil is started, the heat is conducted to the internal material through the wall of the heating tank 2, and the initial temperature rise begins. At the same time, the insulation cotton outside the connecting pipe 29 and the conveying pipe 210 plays a role in reducing heat loss to the outside and accelerating the heating efficiency inside the tank. When the material inside the heating tank 2 reaches the initial softening temperature, it can be monitored by the temperature sensor inside the tank. Temperature sensor monitoring is existing technology, so it will not be described in detail. Start the servo motor 3 of the circulating stirring mechanism. The motor output shaft drives the rotating shaft 31 to rotate through the coupling. The first bevel gear 32 on the rotating shaft 31 rotates synchronously.

[0038] Step two: The first bevel gear 32 meshes with the second bevel gear 34, driving the hollow tube 33 to rotate around the central axis of the heating tank 2. The drive rod 35 connected to the lower end of the hollow tube 33 rotates accordingly, causing the spiral scraper 36 to move in a circular motion along the tank wall, scraping off the molten material that is too hot due to contact with the tank wall, preventing local overheating and carbonization. At the same time, the first bevel gear 32 meshes with the third bevel gear 39, driving the rotating rod 38 to rotate inside the hollow tube 33. The stirring blades 310 outside the rotating rod 38 rotate with the rotating rod 38, forming shearing and disturbance on the middle layer of material in the heating tank 2, breaking the thermal stratification, and promoting heat exchange between the middle layer of material and the upper and lower layers of material. When the variable diameter spiral blade 311 at the lower end of the rotating rod 38 rotates, it uses the spiral helix angle to push the relatively cooler material at the bottom of the heating tank 2 upward, realizing the replacement of the bottom and upper layers of material.

[0039] Step 3: Start the gear circulation pump 28. The pump body draws the molten material from the bottom of the heating tank 2 through the discharge pipe 25. The material enters the diversion pipe 26 through the discharge pipe 25, and is then pumped into the gear circulation pump 28 through the connecting pipe 29. At this time, the insulation cotton of the connecting pipe 29 and the conveying pipe 210 continuously blocks heat loss, ensuring that the temperature of the material is stable in the circulation path. The pumped material is returned to the upper end of the heating tank 2 through the conveying pipe 210, forming convection with the material pushed by the circulation stirring mechanism. The outer layer of material circulation driven by the gear circulation pump 28 cooperates with the inner layer of material circulation of the circulation stirring mechanism to complete one alternating flow of the entire tank of material, so as to control the temperature difference of the material in the tank and achieve uniform heating.

[0040] Step four: The temperature sensor installed in the heating tank 2 collects the material temperature in different areas in real time and feeds it back to the temperature control system. When the material temperature reaches the target value, the temperature control system automatically adjusts the power of the electric heating coil to maintain a constant temperature in the heating chamber 22. The circulating stirring mechanism and gear circulating pump 28 continue to run to ensure dynamic circulation of the material and avoid temperature fluctuations caused by differences in heat conduction. If a local temperature deviation occurs, the spiral scraper 36 accelerates scraping, and with the upward push of the variable diameter spiral blade 311 and the disturbance of the stirring blade 310, the temperature is quickly balanced.

[0041] 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 heating circulation chamber for preparing raw materials of nylon particles, comprising a fixed base (1), characterized in that: A circulating heating mechanism is provided above the fixed base (1); The circulating heating mechanism includes a heating tank (2), and symmetrically distributed support blocks (21) are fixedly connected to the outside of the heating tank (2). The lower ends of the two support blocks (21) are fixedly connected to the upper end of the fixed base (1). A heating cavity (22) is opened inside the heating tank (2). A feed pipe (23) is fixedly connected to the upper end of the heating tank (2). A sealing cap (24) is provided at the upper end of the feed pipe (23). A discharge pipe (25) is fixedly connected to the lower end of the heating tank (2). A diversion pipe (26) is fixedly connected to the lower end of the discharge pipe (25). A circulating stirring mechanism is provided above the heating tank (2).

2. The heating circulation chamber for preparing nylon particles according to claim 1, characterized in that: The outside of the diversion pipe (26) is provided with a discharge valve (27), and the outside of the heating tank (2) is fixedly installed with a gear circulation pump (28), and the lower end of the gear circulation pump (28) is fixedly connected to a connecting pipe (29).

3. The heating circulation chamber for preparing nylon particles according to claim 2, characterized in that: One end of the connecting pipe (29) is fixedly connected to one end of the diversion pipe (26) through a flange. The upper end of the gear circulation pump (28) is fixedly connected to the conveying pipe (210), and one end of the conveying pipe (210) is fixedly connected to the upper end of the heating tank (2).

4. The heating circulation chamber for preparing nylon particles according to claim 1, characterized in that: The circulating stirring mechanism includes a servo motor (3), the output shaft of the servo motor (3) is fixedly mounted with a rotating shaft (31) through a coupling, a first bevel gear (32) is fixedly sleeved on one end of the rotating shaft (31), and a hollow tube (33) is rotatably connected to the upper inner wall of the heating tank (2) through a bearing.

5. The heating circulation chamber for preparing nylon particles according to claim 4, characterized in that: The upper end of the hollow tube (33) is fixedly sleeved with a second bevel gear (34), the tooth surface of the second bevel gear (34) meshes with the tooth surface of the first bevel gear (32), and the lower end of the hollow tube (33) is fixedly connected with a drive rod (35), and one end of the drive rod (35) is fixedly connected with a spiral scraper (36).

6. The heating circulation chamber for preparing nylon particles according to claim 5, characterized in that: The outer surface of the spiral scraper (36) is in contact with the inner wall of the heating tank (2). A reinforcing rod (37) is fixedly connected to the outside of the drive rod (35). One end of the reinforcing rod (37) is fixedly connected to the inner surface of the spiral scraper (36). A rotating rod (38) is rotatably connected to the inner wall of the hollow tube (33) through a bearing.

7. The heating circulation chamber for preparing nylon particles according to claim 6, characterized in that: The upper end of the rotating rod (38) is fixedly sleeved with a third bevel gear (39), the tooth surface of the third bevel gear (39) meshes with the tooth surface of the first bevel gear (32), the rotating rod (38) is fixedly connected with stirring blades (310) arranged in a ring array, and the lower end of the rotating rod (38) is fixedly sleeved with a variable diameter spiral blade (311).

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