Reaction kettle for producing low-molecular-weight polyamide resin

Abstract

The utility model provides a reaction kettle for producing low-molecular-weight polyamide resin, which comprises a barrel body, an over-temperature column is arranged in the middle of the barrel body, an end cover is arranged on the periphery of the over-temperature column, the periphery of the end cover is connected to an inner ring of the barrel body, a discharging space is arranged between the periphery of the over-temperature column and the inner ring of the barrel body, and the discharging space is used for containing materials. Cavities are formed in the side wall of the barrel body and the over-temperature column respectively, the cavities are communicated with external heat exchange equipment, the heat exchange equipment is used for filling the cavities with heat exchange media, a stirring assembly is arranged on the end cover, and the execution end of the stirring assembly can stretch into materials. According to the reaction kettle for producing the low-molecular-weight polyamide resin, the over-temperature column is arranged in the middle of the barrel body, and the over-temperature column and the barrel body are respectively used for controlling the temperature of a to-be-produced material, so that the uniform distribution of the temperature in the reaction kettle is ensured, and the production quality is improved.

Description

Technical Field

[0001] The utility model belongs to the field of polyamide resin production, in particular to a reaction kettle for producing low molecular weight polyamide resin. Background Art

[0002] Polyamide resin is a polycondensation polymer compound with a CONH structure in the molecule. It is usually obtained by polycondensation of dibasic acid and diamine. The most prominent advantage of polyamide resin is that the softening point range is particularly narrow. Unlike other thermoplastic resins, there is a gradual solidification or softening process. When the temperature is slightly lower than the melting point, it causes rapid solidification. Polyamide resin has good chemical resistance and can resist acids, alkalis, vegetable oils, mineral oils, etc. At present, in the chemical production process of polyamide resin, reactor products are needed for production. Because the melting point range of polyamide resin is narrow, it is necessary to keep the temperature distribution in the reactor uniform during polymerization and stirring in the reactor to prevent large temperature fluctuations and unstable product quality. Summary of the invention

[0003] In view of this, the utility model aims to provide a reactor for producing low molecular weight polyamide resin to solve the problem of unstable production quality caused by the narrow melting point of polyamide resin and inconsistent temperature distribution in the reactor in the prior art.

[0004] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0005] A reaction kettle for producing low molecular weight polyamide resin comprises a barrel body, an over-temperature column is arranged in the middle of the barrel body, an end cover is arranged around the over-temperature column, and the periphery of the end cover is connected to the inner ring of the barrel body, a discharge space is arranged between the periphery of the over-temperature column and the inner ring of the barrel body, and the discharge space is used to hold materials, cavities are respectively arranged in the side wall of the barrel body and the over-temperature column, and the cavities are connected to an external heat exchange device, and the heat exchange device is used to fill the cavity with heat exchange medium, and a stirring component is arranged on the end cover, and the execution end of the stirring component can probe into the material.

[0006] Furthermore, a collecting hopper is arranged at the lower end of the barrel body, and the collecting hopper is a funnel-shaped structure, a discharge pipe is arranged at the lower end of the collecting hopper, and a feed pipe is arranged on the side wall of the barrel body.

[0007] Furthermore, the overtemperature column includes a column, an upper cone and a lower cone which are arranged in sequence from top to bottom, and the upper cone and the lower cone are arranged opposite to each other, the column is a hollow cylindrical structure, the upper cone is a hollow frustum structure, the lower cone is a hollow inverted cone structure, and the column, the upper cone and the lower cone are an integrated structure.

[0008] Furthermore, an end cover is arranged on the periphery of the column, and the periphery of the lower cone is detachably connected to the inner wall of the barrel body through a support plate.

[0009] Furthermore, the end cover is provided with a plurality of axial holes, each axial hole corresponds to a stirring assembly, the stirring assembly includes a stirring shaft and stirring blades, a stirring shaft is rotatably sleeved in each axial hole, stirring blades are arranged on the periphery of the stirring shaft, and the stirring blades are located in the barrel body, a stirring motor is installed at one end of the stirring shaft, and the periphery of the stirring motor is fixedly connected to the end cover.

[0010] Furthermore, the stirring blades are arranged in a spiral shape.

[0011] Furthermore, the stirring assembly also includes a rotating mechanism, which includes a rotating motor. The rotating motor is installed on the barrel body, and the outer periphery of the upper end of the overtemperature column is rotatably sleeved to the middle of the end cover. The rotating motor is used to drive the end cover to rotate.

[0012] Furthermore, a fixing ring is fixedly installed on the inner ring of the upper end of the barrel body, the periphery of the end cover is overlapped on the fixing ring, and the periphery of the end cover is evenly distributed with saw teeth, and the periphery of the output gear of the rotating motor is meshed with the saw teeth.

[0013] Furthermore, a plurality of support parts are arranged on the fixing ring along the circumferential direction, and the execution end of each support part is rollingly connected to the lower end of the end cover.

[0014] Furthermore, the supporting part is a roller or a ball.

[0015] Compared with the prior art, the reactor for producing low molecular weight polyamide resin described in the utility model has the following beneficial effects:

[0016] (1) The reactor for producing low molecular weight polyamide resin described in the utility model has an over-temperature column arranged in the middle of the barrel body. The over-temperature column and the barrel body are used to control the temperature of the material to be produced respectively, so as to ensure uniform temperature distribution in the reactor and improve production quality.

[0017] (2) The utility model discloses a reactor for producing low molecular weight polyamide resin, wherein the upper cone is a hollow truncated cone structure, and the lower cone is a hollow inverted cone structure. The upper cone and the lower cone are used to prevent the material from accumulating on the over-temperature column, and at the same time improve the heat exchange surface of the material to be produced, thereby improving the heat exchange efficiency.

[0018] (3) In the reactor for producing low molecular weight polyamide resin described in the utility model, the stirring blades are arranged in a spiral shape. During implementation, at least two stirring assemblies are provided, and the spiral directions of the stirring blades of the two stirring assemblies are opposite or the stirring motors of the two stirring assemblies rotate in opposite directions, so as to improve the stirring efficiency of the stirring assembly for the material to be produced.

[0019] (4) In the reactor for producing low molecular weight polyamide resin described in the utility model, the fixing ring is used to improve the stability of the end cover on the barrel body, and the end cover can be rotated by a rotary motor to improve the stirring efficiency. The support part is used to prevent the hard friction between the end cover and the fixing ring from reducing the service life of the parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0021] Figure 1 This is a schematic diagram of the structure of a reaction kettle for producing low molecular weight polyamide resin according to an embodiment of the utility model;

[0022] Figure 2 It is a cross-sectional schematic diagram of a reaction kettle for producing low molecular weight polyamide resin according to an embodiment of the utility model;

[0023] Figure 3 It is a schematic diagram of the structure of the over-temperature column, stirring assembly and end cover assembly described in an embodiment of the utility model;

[0024] Figure 4 It is a schematic structural diagram of the fixing ring described in an embodiment of the utility model.

[0025] Description of reference numerals:

[0026] 1-barrel body; 11-collecting bucket; 12-discharge pipe; 13-feed pipe; 14-cavity; 2-end cover; 3-overheating column; 31-column; 32-upper cone; 33-lower cone; 34-support plate; 4-stirring assembly; 41-stirring shaft; 42-stirring blade; 43-stirring motor; 5-rotating mechanism; 51-rotating motor; 52-fixing ring; 53-support part. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0028] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

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

[0031] like Figure 1-Figure 4 As shown, a reactor for producing low molecular weight polyamide resin includes a barrel body 1, an over-temperature column 3 is provided in the middle of the barrel body 1, an end cover 2 is provided around the over-temperature column 3, and the periphery of the end cover 2 is connected to the inner ring of the barrel body 1, a discharge space is provided between the periphery of the over-temperature column 3 and the inner ring of the barrel body 1, and the discharge space is used to hold materials, and cavities 14 are respectively provided in the side wall of the barrel body 1 and the over-temperature column 3, and the cavity 14 is connected to an external heat exchange device, and the heat exchange device is used to fill the cavity 14 with a heat exchange medium, a stirring component 4 is provided on the end cover 2, and the execution end of the stirring component 4 can penetrate into the material, an over-temperature column 3 is provided in the middle of the barrel body 1, and the temperature of the material to be produced is controlled on the over-temperature column 3 and the barrel body 1 respectively, so as to ensure uniform temperature distribution in the reactor and improve production quality, and the heat exchange device of this embodiment is the prior art, and the heat exchange medium is liquid oil.

[0032] A collecting hopper 11 is arranged at the lower end of the barrel body 1, and the collecting hopper 11 is a funnel-shaped structure. A discharge pipe 12 is arranged at the lower end of the collecting hopper 11, and a feed pipe 13 is arranged on the side wall of the barrel body 1. The collecting hopper 11 is convenient for gathering materials so that the materials in the barrel body 1 can be released from the discharge pipe 12. The overtemperature column 3 includes a column 31, an upper cone 32 and a lower cone 33 arranged in sequence from top to bottom, and the upper cone 32 and the lower cone 33 are arranged opposite to each other. The column 31 is a hollow cylindrical structure, the upper cone 32 is a hollow frustum structure, and the lower cone 33 is a hollow inverted cone structure. The column 31, the upper cone 32 and the lower cone 33 are an integral structure. The upper cone 32 and the lower cone 33 are used to prevent materials from accumulating on the overtemperature column 3, while improving the heat exchange profile of the material to be produced and improving the heat exchange efficiency.

[0033] An end cap 2 is arranged on the periphery of the column 31, and the periphery of the lower cone 33 is detachably connected to the inner wall of the barrel body 1 through a support plate 34. The support plate 34 is used to support the relative position of the overtemperature column 3 in the barrel body 1. A plurality of through-axis holes are arranged on the end cap 2, and each through-axis hole corresponds to a stirring component 4. The stirring component 4 includes a stirring shaft 41 and a stirring blade 42. The stirring shaft 41 is rotatably sleeved in each through-axis hole. A stirring blade 42 is arranged on the periphery of the stirring shaft 41, and the stirring blade 42 is located in the barrel body 1. A stirring motor 43 is installed at one end of the stirring shaft 41, and the periphery of the stirring motor 43 is fixedly connected to the end cap 2. The stirring blades 42 are arranged in a spiral shape, such as Figure 3 As shown, at least two stirring assemblies 4 are provided during implementation, and the stirring blades 42 of the two stirring assemblies 4 have opposite spiral directions or the stirring motors 43 of the two stirring assemblies 4 have opposite rotation directions, so as to improve the stirring efficiency of the stirring assemblies 4 for the materials to be produced.

[0034] The stirring assembly 4 also includes a rotating mechanism 5, which includes a rotating motor 51. The rotating motor 51 is installed on the barrel body 1. The upper end periphery of the overtemperature column 3 is rotatably sleeved to the middle of the end cover 2. The rotating motor 51 is used to drive the end cover 2 to rotate. A fixing ring 52 is fixedly installed on the inner ring of the upper end of the barrel body 1. The periphery of the end cover 2 is overlapped on the fixing ring 52, and the periphery of the end cover 2 is evenly distributed with serrations. The periphery of the output gear of the rotating motor 51 is meshed with the serrations. A plurality of supporting parts 53 are circumferentially arranged on the fixing ring 52. The execution end of each supporting part 53 is rollingly connected to the lower end of the end cover 2. The fixing ring 52 is used to improve the stability of the end cover 2 on the barrel body 1. At the same time, the end cover 2 can be rotated by the rotating motor 51 to improve the stirring efficiency. The supporting part 53 is used to prevent the hard friction between the end cover 2 and the fixing ring 52 from reducing the service life of the parts. During implementation, the supporting part 53 rollers or balls, such as Figure 4 As shown, this embodiment adopts the installation form of rollers.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reactor for producing low molecular weight polyamide resin, characterized in that: The invention comprises a barrel (1), wherein an over-temperature column (3) is provided in the middle of the barrel (1), an end cover (2) is provided on the periphery of the over-temperature column (3), and the periphery of the end cover (2) is connected to the inner ring of the barrel (1), a discharge space is provided between the periphery of the over-temperature column (3) and the inner ring of the barrel (1), and the discharge space is used to hold materials, cavities (14) are respectively provided in the side wall of the barrel (1) and the over-temperature column (3), and the cavity (14) is connected to an external heat exchange device, and the heat exchange device is used to fill a heat exchange medium into the cavity (14), and a stirring component (4) is provided on the end cover (2), and the execution end of the stirring component (4) can be inserted into the material.

2. A reaction kettle for producing low molecular weight polyamide resin according to claim 1, characterized in that: A collecting hopper (11) is arranged at the lower end of the barrel body (1), and the collecting hopper (11) is a funnel-shaped structure. A discharge pipe (12) is arranged at the lower end of the collecting hopper (11), and a feed pipe (13) is arranged on the side wall of the barrel body (1).

3. A reaction kettle for producing low molecular weight polyamide resin according to claim 1, characterized in that: The overtemperature column (3) comprises a column (31), an upper cone (32) and a lower cone (33) which are arranged in sequence from top to bottom, and the upper cone (32) and the lower cone (33) are arranged opposite to each other, the column (31) is a hollow cylindrical structure, the upper cone (32) is a hollow frustum structure, and the lower cone (33) is a hollow inverted cone structure, and the column (31), the upper cone (32) and the lower cone (33) are an integrated structure.

4. A reaction kettle for producing low molecular weight polyamide resin according to claim 3, characterized in that: An end cover (2) is disposed on the periphery of the column (31), and the periphery of the lower cone (33) is detachably connected to the inner wall of the barrel (1) via a support plate (34).

5. A reaction kettle for producing low molecular weight polyamide resin according to claim 1, characterized in that: The end cover (2) is provided with a plurality of through-axis holes, each through-axis hole corresponds to a stirring assembly (4), the stirring assembly (4) comprises a stirring shaft (41) and a stirring blade (42), each through-axis hole is rotatably sleeved in the stirring shaft (41), the stirring blade (42) is arranged on the periphery of the stirring shaft (41), and the stirring blade (42) is located in the barrel body (1), a stirring motor (43) is installed at one end of the stirring shaft (41), and the periphery of the stirring motor (43) is fixedly connected to the end cover (2).

6. A reaction kettle for producing low molecular weight polyamide resin according to claim 5, characterized in that: The stirring blades (42) are arranged in a spiral shape.

7. A reaction kettle for producing low molecular weight polyamide resin according to claim 5, characterized in that: The stirring assembly (4) further comprises a rotating mechanism (5), wherein the rotating mechanism (5) comprises a rotating motor (51), wherein the rotating motor (51) is mounted on the barrel body (1), wherein the outer periphery of the upper end of the over-temperature column (3) is rotatably sleeved on the middle part of the end cover (2), and the rotating motor (51) is used to drive the end cover (2) to rotate.

8. A reaction kettle for producing low molecular weight polyamide resin according to claim 7, characterized in that: A fixing ring (52) is fixedly mounted on the inner ring of the upper end of the barrel body (1), the periphery of the end cover (2) is overlapped on the fixing ring (52), and saw teeth are evenly distributed on the periphery of the end cover (2), and the periphery of the output gear of the rotating motor (51) is meshed with the saw teeth.

9. A reaction kettle for producing low molecular weight polyamide resin according to claim 8, characterized in that: A plurality of support portions (53) are arranged on the fixing ring (52) along the circumferential direction, and an execution end of each support portion (53) is rollingly connected to the lower end of the end cover (2).

10. A reaction kettle for producing low molecular weight polyamide resin according to claim 9, characterized in that: The supporting part (53) is a roller or a ball.

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