A rubber post-processing device

Abstract

A rubber post-processing device of the present invention relates to the technical field of rubber post-processing, wherein the rubber is halogenated butyl rubber or butyl rubber, and comprises: a twin-screw expander and a high-pressure inert gas source; the twin-screw expander comprises a barrel, a male rotor and a female rotor arranged in the barrel, and a working chamber surrounded by the barrel, the male rotor and the female rotor; the male rotor comprises a main section and an outlet section connected in sequence along the direction from the feed port of the barrel to the discharge port of the barrel, the shaft diameter of the main section is larger than the shaft diameter of the outlet section, the connection between the main section and the outlet section is located in the tail of the barrel, and the barrel is provided with an injection hole on the circumference of the connection in the axial direction, and the inert gas of the high-pressure inert gas source enters the working chamber through the injection hole. The present invention can greatly improve the production capacity of the post-processing equipment of halogenated butyl rubber or butyl rubber.

Description

Technical Field

[0001] The present invention relates to the technical field of rubber post-processing, and more particularly, to a rubber post-processing device. Background Art

[0002] The twin-screw expander is the main core equipment in the halogenated butyl rubber post-processing production line. It feeds the rubber with a water content of less than 10% after being treated by the extrusion dehydrator into the space between the fully enclosed twin screws. After the reverse extrusion and shearing of the two-way counter-helix, a high-temperature and high-pressure product is formed in the screw cavity. The high-temperature and high-pressure product is flash-expanded after passing through the adjustable die hole to remove the moisture inside the rubber particles.

[0003] In the post-processing production of halogenated butyl rubber, the production capacity has been greatly improved after continuous optimization of the front-end device process. However, the equipment performance of the core twin-screw expander of the post-processing production line directly limits the processing capacity of the production line. The quality of the products after treatment by the expander has always been the key to restricting the increase in production capacity. It is urgent to improve the processing capacity of the expander.

[0004] Patent Zl201910887580.3 discloses a post-processing method for producing butyl rubber, including making holes in the barrel of a twin-screw expansion dryer as an injection port for a conveying medium, and the twin-screw expansion dryer uses high-pressure inert gas as a conveying medium. However, the shaft diameter of the screws of the twin-screw expander is consistent, and the effects of opening holes at different positions on the barrel are not much different, which can only increase the production capacity by 10%, and the production capacity of the post-processing equipment is limited. Summary of the invention

[0005] The purpose of the present invention is to remedy the defects of the prior art and provide a rubber post-processing device to greatly improve the production capacity of halogenated butyl rubber or butyl rubber post-processing equipment.

[0006] An embodiment of the present invention provides a rubber post-processing device, wherein the rubber is halogenated butyl rubber or butyl rubber, and comprises: a twin-screw expander and a high-pressure inert gas source; the twin-screw expander comprises a barrel, a male rotor and a female rotor arranged in the barrel, and a working chamber surrounded by the barrel, the male rotor and the female rotor; the male rotor comprises a main section and an outlet section which are connected in sequence along a direction from a feed port of the barrel to a feed port of the barrel, the shaft diameter of the main section is larger than the shaft diameter of the outlet section, the connection between the main section and the outlet section is located in the tail of the barrel, and an injection hole is opened on the circumference of the barrel axially opposite to the connection, and the inert gas of the high-pressure inert gas source enters the working chamber through the injection hole.

[0007] Optionally, the cylinder body includes a sleeve, an inner cylinder and an outer cylinder which are arranged in sequence from the inside to the outside, at least a portion of the male rotor and at least a portion of the female rotor are located in the sleeve, the sleeve, the male rotor and the female rotor form the working chamber, the inner cylinder is sleeved on the sleeve, the outer cylinder and the inner cylinder are spaced apart to form a steam chamber, and the injection hole passes through the sleeve, the inner cylinder and the outer cylinder.

[0008] Optionally, a needle valve is provided on the injection hole, and the high-pressure inert gas source is connected to the needle valve.

[0009] Optionally, the injection hole and the female rotor are respectively located on two opposite sides of the male rotor.

[0010] Optionally, the high-pressure inert gas source comprises a pressure container, in which high-pressure inert gas is stored, and the pressure container is connected to the needle valve through a pipeline.

[0011] Optionally, the inert gas is nitrogen.

[0012] Optionally, the pressure of the inert gas entering the working chamber is in the range of 70 bar to 90 bar.

[0013] Optionally, the high-pressure inert gas source further includes a pressure reducing valve arranged on the pipeline.

[0014] Optionally, the distance between the connection between the main body section and the outlet section and the discharge port of the cylinder is 1 / 7 to 1 / 6 of the length of the cylinder.

[0015] Optionally, an alloy layer is built-up on the inner surface of the bushing.

[0016] The rubber post-processing device provided by the embodiment of the present invention is provided with an injection hole at the position of the connection between the main section of the male rotor and the outlet section on the tail of the cylinder to inject high-pressure inert gas to protect the rubber in the twin-screw expander. After the rubber is extruded, the size of the rubber particles becomes significantly larger and more fluffy, and the porosity is significantly increased. The improvement of the fluidized bed adhesion is conducive to product quality control and can significantly increase the production line output by 40%. At the same time, for the post-processing of halogenated butyl rubber, the halogen content of the product physical properties is significantly improved after the die temperature is reduced, and the stearic acid is reduced, further improving the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description of the invention are briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0018] Figure 1 A composition diagram of a rubber post-processing device provided in an embodiment of the present invention.

[0019] Figure 2 A schematic structural diagram of a twin-screw expander provided in an embodiment of the present invention.

[0020] Figure 3 A front view of a cylinder provided in an embodiment of the present invention.

[0021] Figure 4 for Figure 3 Cross-sectional view at AA in the middle.

[0022] Figure 5 A top view of a cylinder provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0024] like Figure 1-5 As shown, a rubber post-processing device 10 includes a twin-screw expander 100 and a high-pressure inert gas source 200. The twin-screw expander 100 is used to expand and dry halogenated butyl rubber or butyl rubber, and the high-pressure inert gas source 200 is used to provide high-pressure inert gas to the twin-screw expander 100.

[0025] The twin-screw expander 100 includes a barrel 110, a male rotor 120 and a female rotor 130 arranged in the barrel 110, and a working chamber 140 surrounded by the barrel 110, the male rotor 120 and the female rotor 130. The rubber material with a water content of less than 10% after being processed by the extrusion dehydrator enters the working chamber 140 from the feed port 111 of the barrel 110 for extrusion, and then is discharged from the working chamber 140 from the discharge port 112 of the barrel 110.

[0026] The male rotor 120 includes a main section 121 and an outlet section 122 which are connected in sequence along the direction of the feed port 111 of the cylinder 110 pointing to the discharge port 112 of the cylinder 110, the axial diameter of the main section 121 is larger than the axial diameter of the outlet section 122, and the connection 123 between the main section 121 and the outlet section 122 is located in the tail of the cylinder 110, and the cylinder 110 is provided with an injection hole 113 on the circumference of the connection 123 in the axial direction, and the inert gas of the high-pressure inert gas source 200 enters the working chamber 140 through the injection hole 113.

[0027] The rubber post-processing device 10 provided in the embodiment of the present invention opens an injection hole 113 at the position of the connection 123 between the main section 121 of the male rotor 120 and the outlet section 122 on the tail of the cylinder 110 to inject high-pressure inert gas to protect the rubber in the twin-screw expander 100. After the rubber is extruded, the size of the rubber particles becomes significantly larger and more fluffy, and the porosity is significantly increased. The improvement of the fluidized bed adhesion is conducive to product quality control and can significantly increase the production line output by 40%. At the same time, for the post-processing of halogenated butyl rubber, the halogen content of the product physical properties is significantly improved after the die temperature is reduced, and the stearic acid is reduced, further improving the product quality.

[0028] As a preferred implementation of the embodiment of the present invention, Figure 4 As shown, the cylinder 110 includes a bushing 114, an inner cylinder 115 and an outer cylinder 116 which are arranged in sequence from the inside to the outside, at least a portion of the male rotor 120 and at least a portion of the female rotor 130 are located in the bushing 114, specifically, the main parts of the male rotor 120 and the female rotor 130 are located in the cylinder 110, and both ends of the male rotor 120 and the female rotor 130 extend out of the cylinder 110. The bushing 114, the male rotor 120 and the female rotor 130 enclose the working chamber 140, the inner cylinder 115 is sleeved on the bushing 114, the outer cylinder 116 and the inner cylinder 115 are spaced apart to enclose a steam chamber 117, and the injection hole 113 passes through the bushing 114, the inner cylinder 115 and the outer cylinder 116. In this embodiment, the cylinder body 110 is a sandwich structure, including a sleeve 114, an inner cylinder 115 and an outer cylinder 116 arranged in sequence from the inside to the outside. The outer cylinder 116 surrounds the inner cylinder 115 and forms a steam chamber 117. The steam flowing in the steam chamber 117 is used to heat the rubber in the working chamber 140. The injection hole 113 penetrates the sleeve 114, the inner cylinder 115 and the outer cylinder 116 to allow the external high-pressure inert gas to enter the working chamber 140.

[0029] As a further improved implementation of the embodiment of the present invention, Figure 1 As shown, a needle valve 300 is provided on the injection hole 113, and the high-pressure inert gas source 200 is connected to the needle valve 300. In this embodiment, the needle valve 300 can prevent the rubber in the working chamber 140 from flowing back and blocking the passage of the high-pressure inert gas into the working chamber 140, thereby ensuring that the rubber post-processing device 10 can work stably and effectively for a long time.

[0030] As a preferred implementation of the embodiment of the present invention, Figure 4As shown, the injection hole 113 and the female rotor 130 are respectively located on two opposite sides of the male rotor 120, that is, the female rotor 130 is located on one side of the male rotor 120 and meshes with the male rotor 120 for transmission, and the injection hole 113 is located on the other side of the male rotor 120 opposite to the one side.

[0031] As a preferred implementation of the embodiment of the present invention, Figure 1 As shown, the high-pressure inert gas source 200 includes a pressure container 210 , in which high-pressure inert gas is stored. The pressure container 210 is connected to the needle valve 300 through a pipeline.

[0032] As a preferred implementation of the embodiment of the present invention, the inert gas is nitrogen.

[0033] As a preferred implementation of the embodiment of the present invention, the pressure of the inert gas entering the working chamber 140 is in the range of 70 bar-90 bar.

[0034] As a preferred implementation of the embodiment of the present invention, Figure 1 As shown, the high-pressure inert gas source 200 further includes a pressure reducing valve 220 disposed on the pipeline. In this embodiment, the pressure reducing valve 220 on the pipeline can reduce the high-pressure inert gas in the pressure vessel 210 to a suitable pressure for supplying into the working chamber 140.

[0035] As a preferred implementation manner of an embodiment of the present invention, the specific position of the connection 123 between the main section 121 and the outlet section 122 in the cylinder 110 is: the length of the connection 123 between the main section 121 and the outlet section 122 from the discharge port 112 of the cylinder 110 is 1 / 7 to 1 / 6 of the length of the cylinder 110.

[0036] As a preferred implementation of the embodiment of the present invention, an alloy layer is built-up on the inner surface of the bushing 114. In this embodiment, the alloy layer can increase the corrosion resistance of the bushing 114.

[0037] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A post-processing device for rubber, wherein the rubber is halogenated butyl rubber or butyl rubber, comprising: A twin-screw expander and a high-pressure inert gas source; the twin-screw expander comprises a barrel, a male rotor and a female rotor arranged in the barrel, and a working chamber surrounded by the barrel, the male rotor and the female rotor; characterized in that the male rotor comprises a main section and an outlet section which are sequentially connected in a direction along the feed port of the barrel pointing to the discharge port of the barrel, the shaft diameter of the main section is larger than the shaft diameter of the outlet section, the connection between the main section and the outlet section is located in the tail of the barrel, the barrel is provided with an injection hole on the circumference opposite to the connection in the axial direction, and the inert gas of the high-pressure inert gas source enters the working chamber through the injection hole; The cylinder body comprises a bushing, an inner cylinder and an outer cylinder which are arranged in sequence from the inside to the outside, at least a part of the male rotor and at least a part of the female rotor are located in the bushing, the bushing, the male rotor and the female rotor form the working chamber, the inner cylinder is sleeved on the bushing, the outer cylinder and the inner cylinder are spaced apart to form a steam chamber, and the injection hole passes through the bushing, the inner cylinder and the outer cylinder; The distance between the connection between the main body section and the outlet section and the discharge port of the cylinder is 1 / 7 to 1 / 6 of the length of the cylinder.

2. The rubber post-processing device according to claim 1, characterized in that: A needle valve is provided on the injection hole, and the high-pressure inert gas source is communicated with the needle valve.

3. The rubber post-processing device according to claim 2, characterized in that: The injection hole and the female rotor are respectively located on two opposite sides of the male rotor.

4. The rubber post-processing device according to claim 3, characterized in that: The high-pressure inert gas source comprises a pressure container, in which high-pressure inert gas is stored, and the pressure container is connected to the needle valve through a pipeline.

5. The rubber post-processing device according to claim 4, characterized in that: The inert gas is nitrogen.

6. The rubber post-processing device according to claim 5, characterized in that: The pressure of the inert gas entering the working chamber is in the range of 70 bar to 90 bar.

7. The rubber post-processing device according to claim 6, characterized in that: The high-pressure inert gas source also includes a pressure reducing valve arranged on the pipeline.

8. The rubber post-processing device according to claim 1, characterized in that: The inner surface of the bushing is built-up with an alloy layer.

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