Internal mixer and cooling method

Abstract

The invention relates to an internal mixer and a cooling method, the internal mixer comprises a rotor with a rotor flow channel and shaft heads which are respectively inserted at two axial ends of the rotor and are provided with shaft head flow channels, and two ends of the rotor flow channel are respectively and radially communicated with the shaft head flow channels correspondingly inserted into the shaft heads and jointly form a temperature adjusting flow channel for circulating a temperature adjusting medium; the rotor comprises a rotating body with a rotating shaft flow channel and stirring edges with stirring edge cooling cavities, and the rotating shaft flow channel and the stirring edge cooling cavities are communicated in the radial direction and jointly form a rotor flow channel. In order to solve the problem that the cooling efficiency is reduced when an existing rotor cooling structure is applied to a stirring edge with a large radial size, a cooling flow channel is redesigned, the cooling flow channel is arranged between a rotating body and the stirring edge, a cooling medium does not generate backflow in the circulation process, the distance between the cooling flow channel and the stirring edge is shortened, and the cooling efficiency is improved; and the cooling flow channels are respectively arranged in the rotor and the shaft head, so that the processing difficulty and cost are reduced.

Description

Technical Field

[0001] This invention belongs to the field of internal mixer technology, and relates to internal mixers and cooling methods. Background Technology

[0002] A closed-loop mixing mill is a type of internal mixing machine used to mix raw materials such as carbon black, rubber, oil, additives, and accelerators.

[0003] Internal mixers mainly consist of a mixing chamber and a rotor. Currently, common internal mixer rotors can be structurally divided into a rotor body (often cylindrical or hollow), helical stirring ridges distributed around the outside of the rotor body, and shaft ends for mounting bearings at both ends of the rotor body. Existing cooling structures for internal mixer rotors often employ helical grooves carved inside the rotor as cooling channels. This structure is suitable for rotors with relatively regular shapes, small radial dimensions of the stirring ridges, and an overall shape close to a cylinder. Because the radial dimensions of the stirring ridges are small, the distance between the cooling channels and the stirring ridges is short, ensuring cooling efficiency.

[0004] When the radial dimension of the stirring ridge is large, if the above structure is still used, the cooling efficiency will decrease due to the increased distance between the stirring ridge and the cooling channel. Summary of the Invention

[0005] The purpose of this invention is to provide a mixing machine and a cooling method that can solve the above-mentioned problems and improve cooling efficiency.

[0006] According to the technical solution provided by the present invention: a mixer includes a rotor having a rotor flow channel and shaft heads respectively inserted at both ends of the rotor axial direction and having shaft head flow channels. The two ends of the rotor flow channel are respectively radially connected to the shaft head flow channels of the corresponding inserted shaft heads and together form a temperature regulating flow channel for the flow of temperature regulating medium.

[0007] As a further improvement of the present invention, the rotor includes a rotating body having a rotating shaft flow channel and a stirring ridge having a stirring ridge cooling cavity, wherein the rotating shaft flow channel and the stirring ridge cooling cavity are radially connected and together form the rotor flow channel.

[0008] As a further improvement of the present invention, the stirring ridge has a first connecting hole and a second connecting hole radially disposed at both ends of the stirring ridge cooling cavity. The first connecting hole connects the stirring ridge cooling cavity with the shaft head flow channel of the corresponding shaft head, and the second connecting hole connects the stirring ridge cooling cavity with the rotating shaft flow channel.

[0009] As a further improvement of the present invention, the rotor includes at least two stirring ridges that are discontinuously arranged in the axial direction of the rotor or at least two stirring ridges that are evenly distributed in the circumferential direction of the rotor. The first connecting hole of each stirring ridge is connected to the shaft head flow channel of the corresponding shaft head, and the second connecting hole of each stirring ridge is connected to the shaft flow channel.

[0010] As a further improvement of the present invention, the rotating shaft flow channel is arranged in the form of an axial through hole on the axis of the rotating shaft.

[0011] As a further improvement of the present invention, the shaft head flow channel includes a shaft head main hole axially disposed in the shaft head and a shaft head secondary hole radially disposed on the shaft head, the shaft head secondary hole being radially connected to the rotor flow channel.

[0012] As a further improvement of the present invention, the main hole of the shaft head is provided in the form of a blind hole, which extends from the end of the shaft head away from the rotor to the secondary hole of the shaft head.

[0013] As a further improvement of the present invention, the number of secondary holes in the shaft head is set to correspond to the number of stirring ridges in the circumferential plane of the rotor.

[0014] As a further improvement of the present invention, the temperature regulating medium includes one or more of phase change materials, refrigerants, water, and heat transfer oil.

[0015] A cooling method applicable to any of the internal mixers described above, wherein the temperature regulating medium flows into the shaft head flow channel of one of the shaft heads and radially into the rotor flow channel, then flows radially into the shaft head flow channel of the other shaft head and flows out to complete the cooling.

[0016] The positive and progressive effects of this invention are as follows: To address the problem of reduced cooling efficiency in existing rotor cooling structures when the radial dimension of the stirring ridge is large, this invention redesigns the cooling channel by placing it between the rotor and the stirring ridge. This prevents backflow of the cooling medium during the flow process, shortens the distance between the cooling channel and the stirring ridge, and improves cooling efficiency. The cooling channels are located in both the rotor and the shaft head, reducing manufacturing difficulty and cost. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention.

[0018] Figure 2 for Figure 1 AA sectional view.

[0019] Figure 3 This is a schematic diagram of the rotor structure of the present invention.

[0020] Figure 4This is a schematic diagram of the structure of the shaft head of the present invention.

[0021] Figures 1-4 The components include rotor 1, rotating body 1-1, axial flow channel 1-11, first connecting hole of cooling chamber 1-12, second connecting hole of cooling chamber 1-13, stirring ridge 1-2, stirring ridge cooling chamber 1-21, sealing plate 1-22, stirring surface 1-23, stirring support surface 1-24, stirring ridge 1-25, shaft head 2, shaft head main hole 2-1, shaft head secondary hole 2-2, positioning shaft section 2-3, positioning shaft shoulder 2-4, etc. Detailed Implementation

[0022] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention 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 invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0024] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of the invention described herein. Furthermore, terms such as "comprising" and "having" mean that in addition to those already listed in "comprising" and "having," other unlisted contents may also be included; for example, a process, method, system, product, or device may include a series of steps or units, not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0025] Due to the angle of the drawing, some parts may not be drawn, but their positions and connections can be understood from the text descriptions.

[0026] like Figures 1-2 As shown, the present invention is a mixing machine, including a mixing chamber, a rotor 1 in the mixing chamber, and shaft heads 2 installed at both ends of the rotor 1; a rotating body 1-1 in the middle of the rotor 1, and two layers of stirring ribs on the outer periphery of the rotating body 1-1, each stirring rib group consisting of stirring ribs 1-2; cooling channels are provided in the rotor 1 and the shaft heads 2.

[0027] The cooling channels include rotor channels and shaft head channels. The rotor channels include shaft channels 1-11 and stirring ridge cooling chambers 1-21. Shaft channels 1-11 and stirring ridge cooling chambers 1-21 are connected by a first connecting hole 1-12 and a second connecting hole 1-13. Figure 3 As shown; the rotating shaft flow channel 1-11 axially penetrates the middle of the rotating body 1-1, the stirring ridge cooling chamber 1-21 is located inside the stirring ridge 1-2, the first connecting hole 1-12 and the second connecting hole 1-13 of the cooling chamber are radially arranged in the rotor 1, the first connecting hole 1-12 of the cooling chamber is closer to the shaft head 2 than the second connecting hole 1-13 of the cooling chamber, and the two ends of the first connecting hole 1-12 and the second connecting hole 1-13 of the cooling chamber are respectively connected to the rotating shaft flow channel 1-11 and the stirring ridge cooling chamber 1-21. Figure 4 As shown, the shaft head flow channel includes a shaft head main hole 2-1 and a shaft head secondary hole 2-2. The shaft head main hole 2-1 is axially disposed in the shaft head 2, and the shaft head secondary hole 2-2 is radially disposed in the shaft head 2. The shaft head main hole 2-1 is a blind hole. One end of the shaft head main hole 2-1 is connected to the shaft head secondary hole 2-2, and the other end of the shaft head main hole 2-1 is exposed at the front of the shaft head 2. The rear end of the shaft head 2 is a sealing structure. The other end of the shaft head secondary hole 2-2 is located on the outer periphery of the rear part of the shaft head 2. The shaft head secondary hole 2-2 is connected to the first connecting hole 1-12 of the cooling chamber.

[0028] To facilitate the installation of rotor 1 and shaft head 2 and the docking of shaft head secondary hole 2-2 with cooling chamber first connecting hole 1-12, a positioning shaft section 2-3 and a positioning shaft shoulder 2-4 are provided on the outer periphery of the rear part of shaft head 2. The positioning shaft section 2-3 is adapted to the size and shape of the rotating shaft flow channel 1-11, and the positioning shaft shoulder 2-4 is located at the depth of the positioning shaft head 2 extending into rotor 1.

[0029] The rotor 1 is a one-piece casting. In order to facilitate the manufacturing of the stirring ridge cooling cavity 1-21, a through cooling hole is first formed on the stirring ridge 1-2. Then, sealing plates 1-22 are installed on both sides of the cooling hole by welding. The shape of the sealing plates 1-22 is the same as the cross-sectional shape of the stirring ridge cooling cavity 1-21. They are used to seal the cooling hole and surround the cooling hole to form the stirring ridge cooling cavity 1-21, preventing the cooling medium from leaking out.

[0030] The cooling chamber 1-21 of the stirring ridge is adapted to the outer periphery of the stirring ridge 1-2, and the stirring ridges 1-2 are of equal thickness to avoid uneven force during stirring.

[0031] The two sides of the stirring ridge 1-2 are the stirring surface 1-23 and the stirring support surface 1-24, respectively, and the area between the stirring surface 1-23 and the stirring support surface 1-24 is the stirring ridge 1-25.

[0032] When it is necessary to increase the stirring efficiency, several stirring ridges 1-2 can be arranged in a ring around the outer periphery of the same shaft segment of the rotating body 1-1. In order to improve the uniformity of stirring, the stirring surfaces 1-23 of the stirring ridges 1-2 arranged in a ring around the outer periphery of the same shaft segment of the rotating body 1-1 are evenly distributed along the circumferential direction; the stirring surfaces 1-23 of adjacent stirring ridges 1-2 in the same axis of the rotating body 1-1 are mirror images of each other.

[0033] The working process of this invention is as follows: A cooling method for an internal mixer, wherein the cooling medium sequentially passes through the shaft head flow channel of one side shaft head 2, the stirring rib cooling chamber 1-21 of the first layer of stirring ribs, the stirring rib cooling chamber 1-21 of the second layer of stirring ribs, and the shaft head flow channel of the other side shaft head 2 to cool the rotor 1 and the shaft head 2.

[0034] Specifically, the cooling medium sequentially passes through the main shaft hole 2-1 and the secondary shaft hole 2-2 of one side shaft head 2, enters the stirring ridge cooling chamber 1-21 through the first connecting hole 1-12 of the cooling chamber, and then enters the middle section of the rotating shaft flow channel 1-11 through the second connecting hole 1-13 of the cooling chamber. After that, it enters the stirring ridge cooling chamber 1-21 through the second connecting hole 1-13 of the cooling chamber of the other side stirring ridge 1-2, and then flows out through the secondary shaft hole 2-2 and the main shaft hole 2-1 of the other side shaft head 2.

[0035] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A personal mixer, characterized in that, It includes a rotor with a rotor flow channel and shaft heads inserted at both ends of the rotor axial direction and having shaft head flow channels. The two ends of the rotor flow channel are respectively radially connected to the shaft head flow channels of the corresponding inserted shaft heads and together form a temperature regulating flow channel for the flow of temperature regulating medium.

2. The internal mixer as described in claim 1, characterized in that, The rotor includes a rotating body with a rotating shaft flow channel and a stirring ridge with a stirring ridge cooling cavity. The rotating shaft flow channel and the stirring ridge cooling cavity are radially connected and together form the rotor flow channel.

3. The internal mixer as described in claim 2, characterized in that, The stirring ridge has a first connecting hole and a second connecting hole radially disposed at both ends of the stirring ridge cooling cavity. The first connecting hole connects the stirring ridge cooling cavity with the shaft head flow channel of the corresponding shaft head, and the second connecting hole connects the stirring ridge cooling cavity with the rotating shaft flow channel.

4. The internal mixer as described in claim 3, characterized in that, The rotor includes at least two stirring ridges that are discontinuously arranged in the axial direction of the rotor or at least two stirring ridges that are evenly distributed in the circumferential direction of the rotor. The first connecting hole of each stirring ridge is connected to the shaft head flow channel of the corresponding shaft head, and the second connecting hole of each stirring ridge is connected to the shaft flow channel.

5. The internal mixer as described in claim 2, characterized in that, The flow channel of the rotating shaft is arranged in the form of an axial through hole on the axis of the rotating shaft.

6. The internal mixer as described in claim 1, characterized in that, The shaft head flow channel includes a shaft head main hole axially disposed within the shaft head and a shaft head secondary hole radially disposed on the shaft head, the shaft head secondary hole being radially connected to the rotor flow channel.

7. The internal mixer as described in claim 6, characterized in that, The main hole of the shaft head is configured as a blind hole, extending from the end of the shaft head away from the rotor to the secondary hole of the shaft head.

8. The internal mixer as described in claim 6, characterized in that, The number of secondary holes on the shaft head corresponds to the number of stirring ridges in the circumferential plane of the rotor.

9. The internal mixer as described in claim 1, characterized in that, The temperature regulating medium includes one or more of phase change materials, refrigerants, water, and heat transfer oil.

10. A cooling method applicable to a mixing mill as described in any one of claims 1-9, characterized in that, The temperature-regulating medium flows into the shaft head channel of one of the shaft heads and radially into the rotor channel, then flows radially into the shaft head channel of the other shaft head after passing through the rotor channel, and finally flows out to complete the cooling process.

Images