A differential twin-shaft asphalt mixing drum and road maintenance equipment

Abstract

The invention discloses a differential double-horizontal shaft asphalt mixture mixing drum and road maintenance equipment, comprising a small mixing shaft and an inner cylinder and an outer cylinder that can rotate relatively; the outer cylinder is sleeved outside the inner cylinder to form an interlayer space with the outer wall of the inner cylinder; the interlayer comprises an annular area and a first area for arranging the small mixing shaft; the small mixing shaft is arranged in the first area of ​​the interlayer between the inner cylinder and the outer cylinder, and is located on one side of the inner cylinder, and the small mixing shaft is parallel to the central axis of the inner cylinder; the small mixing shaft is provided with spirally arranged mixing shaft blades; the outer wall of the inner cylinder is provided with spirally arranged inner cylinder mixing blades; the rotation direction of the small mixing shaft is opposite to that of the inner cylinder. The differential mixing between the small mixing shaft and the inner cylinder enhances the mixing capacity of the drum and makes the mixture more evenly mixed.

Description

Technical Field

[0001] The invention belongs to the technical field of road maintenance equipment and relates to a differential double-horizontal-shaft asphalt mixture stirring drum and road maintenance equipment. Background Art

[0002] The country has higher and higher requirements for energy saving, environmental protection, and recycling of recycled materials. Compared with intermittent asphalt mixing equipment, continuous asphalt mixing equipment has outstanding advantages in energy saving, environmental protection, and recycling rate of recycled materials. Therefore, continuous asphalt mixing equipment is a hot research topic for asphalt mixing equipment in the future. However, the phenomenon of uneven mixing of the mixture of continuous asphalt mixing equipment occurs from time to time, which affects the quality of the mixture and further affects the performance of the asphalt pavement. Therefore, the uniformity of the mixture mixing of continuous asphalt mixing equipment is an issue that needs to be solved urgently.

[0003] In view of the existing problems, the present invention designs a differential twin-horizontal-shaft asphalt recycled mixture mixing drum to improve the mixing capacity of the drum. Summary of the invention

[0004] Purpose: In order to overcome the deficiencies in the prior art, the present invention provides a differential twin-shaft asphalt mixture mixing drum and road maintenance equipment to improve its mixing capacity.

[0005] Technical solution: To solve the above technical problems, the technical solution adopted by the present invention is:

[0006] In a first aspect, a differential twin-shaft asphalt mixing drum is provided, comprising a small mixing shaft and an inner cylinder and an outer cylinder that can rotate relatively;

[0007] The outer cylinder is sleeved outside the inner cylinder to form an interlayer space with the outer wall of the inner cylinder; the interlayer includes an annular area and a first area for arranging a small stirring shaft;

[0008] The central axis of the inner cylinder is arranged obliquely, so that the two ends of the inner cylinder and the outer cylinder form a high end and a low end; the small stirring shaft is arranged in the first area of ​​the interlayer between the inner cylinder and the outer cylinder and is located on one side of the inner cylinder, and the small stirring shaft is parallel to the central axis of the inner cylinder; the small stirring shaft is provided with stirring shaft blades arranged in a spiral manner;

[0009] The high end of the inner cylinder is an open aggregate inlet, and the lower end of the inner cylinder is provided with an aggregate discharge port that penetrates the inner and outer interlayer spaces of the inner cylinder; the inner wall of the inner cylinder is provided with drying and heating blades, and the outer wall of the inner cylinder is provided with spirally arranged inner cylinder stirring blades;

[0010] The outer cylinder wall is provided with a feed inlet and a finished product outlet which are connected with the interlayer space. The feed inlet is located above the other side of the inner cylinder and close to the lower end of the outer cylinder; the finished product outlet is located at the upper end of the outer cylinder and close to the small stirring shaft.

[0011] A discharge blade is arranged on the outer wall of the inner cylinder at a position corresponding to the finished material outlet;

[0012] The rotation direction of the small stirring shaft is opposite to the rotation direction of the inner cylinder.

[0013] In some embodiments, the ratio of the circumferential number of rows of inner cylinder stirring blades on the inner cylinder to the circumferential number of rows of stirring shaft blades on the small stirring shaft is defined as a "differential ratio", the differential ratio is a non-integer, and the speed ratio of the inner cylinder and the small stirring shaft is equal to the differential ratio;

[0014] The ratio of the outer diameter of the inner cylinder to the diameter of the small stirring shaft is 2~9.

[0015] Furthermore, the number of circumferential rows of inner cylinder stirring blades on the inner cylinder is fifteen, the number of circumferential rows of stirring shaft blades on the small stirring shaft is four, and the differential ratio is equal to 3.75.

[0016] In some embodiments, the angle α between the line connecting the axis of the small stirring shaft and the axis of the inner cylinder and the vertical plane is 50° to 70°, preferably 60°.

[0017] In some embodiments, the axial arrangement of the stirring shaft blades and the inner barrel stirring blades are staggered with each other, and the area formed by the inner barrel and the small stirring shaft is a "differential forced stirring zone", and the axial length of the first zone is 1 / 2 to 2 / 3 of the axial length of the annular zone, and the high end of the first zone is flush with the high end of the annular zone.

[0018] In some embodiments, the stirring shaft blades are arranged in the middle of the two corresponding rows of stirring blades in the inner drum.

[0019] In some embodiments, the inner cylinder stirring blades on the inner cylinder are arranged spirally from the lower end to the higher end; the axial angle between the inner cylinder stirring blades and the inner cylinder is 10° to 45°;

[0020] The stirring shaft blades on the small stirring shaft are arranged in a spiral direction from the lower end to the higher end; and the axial angle of the stirring shaft blades is between 20° and 45°.

[0021] In some embodiments, the angle between the central axis of the inner cylinder and the horizontal plane is 4° to 9°, preferably 5°.

[0022] Furthermore, in some embodiments, there are multiple feed inlets, including a RAP material inlet, an asphalt inlet, and a powder material inlet.

[0023] In some embodiments, the differential twin-shaft asphalt mixture mixing drum further includes rolling rings, and rolling rings are respectively arranged in the areas at both ends of the inner cylinder exposed outside the outer cylinder, and rolling rings are respectively arranged in the areas of the small mixing shaft exposed outside the outer cylinder, and the inner cylinder and the small mixing shaft are rotated relative to the outer cylinder by the rotation of the rolling rings.

[0024] In a second aspect, a road maintenance equipment is also provided, comprising the differential twin-horizontal-shaft asphalt mixture mixing drum.

[0025] Beneficial effects: The differential double-horizontal shaft asphalt mixing drum and road maintenance equipment provided by the present invention has a speed ratio of the inner cylinder to the mixing shaft equal to the value of the "differential ratio". The large and small mixing shafts are in an annular space formed between the inner cylinder and the outer cylinder - the interlayer, which is used to heat the recovered asphalt material and mix the mixture. The interlayer is divided into two parts: the interlayer space without the small mixing shaft and the interlayer space with the small mixing shaft. The main function of the interlayer space without the small mixing shaft is to heat the RAP material and pre-mixed mixture, and the interlayer space with the small mixing shaft is mainly used to force the mixing of the mixture. Such a structural combination not only ensures the strength of the small mixing shaft, but also enhances the mixing uniformity of the mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional diagram of a differential twin-horizontal-shaft asphalt mixing drum according to an embodiment;

[0027] Figure 2 This is a view of the differential twin-shaft asphalt mixing drum of the embodiment without the outer cylinder;

[0028] Figure 3 for Figure 2 AA cross-section diagram;

[0029] Figure 4 for Figure 2 BB cross-section diagram;

[0030] In the figure: inner cylinder 1, aggregate inlet 2, rolling ring 3, finished material outlet 4, small stirring shaft 5, RAP material inlet 6, asphalt inlet 7, powder inlet 8; outer cylinder 9, inner cylinder stirring blades 11, discharge blades 12, aggregate discharge port 10, interlayer 13: annular area 13-1, first area 13-2, stirring shaft blades 14. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0033] Example 1

[0034] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a differential twin-shaft asphalt mixing drum comprises a small mixing shaft 5 and an inner cylinder 1 and an outer cylinder 9 which can rotate relatively;

[0035] like Figure 1 , Figure 3 , Figure 4 As shown, the outer cylinder 9 is sleeved outside the inner cylinder 1, and forms a sandwich 13 space with the outer wall of the inner cylinder 1; the central axis of the inner cylinder 1 is arranged obliquely, so that the two ends of the inner cylinder and the outer cylinder form a high end and a low end; Figure 3 , Figure 4 As shown, the interlayer 13 includes an annular area 13-1 and a first area 13-2 for arranging a small stirring shaft 5; the small stirring shaft 5 is arranged in the first area 13-2 of the interlayer 13 between the inner tube 1 and the outer tube 9, and is located on one side of the inner tube 1, the first area 13-2 is located near the high end of the outer tube 9, and the small stirring shaft 5 is parallel to the central axis of the inner tube; the small stirring shaft 5 is provided with spirally arranged stirring shaft blades 14;

[0036] like Figure 1 , Figure 2 , Figure 3 As shown, the high end of the inner cylinder 1 is an open aggregate inlet 2, and the low end of the inner cylinder 1 is a combustion flame inlet; the lower end of the inner cylinder 1 is provided with an aggregate discharge port 10 that penetrates the inner and outer interlayer spaces of the inner cylinder; the inner wall of the inner cylinder 1 is provided with drying and heating blades (not shown in the figure), and the outer wall of the inner cylinder 1 is provided with spirally arranged inner cylinder stirring blades 11;

[0037] The outer cylinder 9 is provided with a feed inlet and a finished product outlet 4 which are connected with the interlayer space. The feed inlet is located above the other side of the inner cylinder 1 and close to the lower end of the outer cylinder 9; the finished product outlet 4 is located at the upper end of the outer cylinder 9 and close to the small stirring shaft 5.

[0038] like Figure 2 As shown, at a position corresponding to the finished material outlet 4, a circle of discharge blades 12 is provided on the outer wall of the inner cylinder 1;

[0039] like Figure 4 As shown, under the action of the driving system, the inner cylinder 1 rotates in the direction of the RAP material entering the interlayer; the rotation direction of the small stirring shaft 5 is opposite to the rotation direction of the inner cylinder 1.

[0040] In some embodiments, Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the diameters of the small stirring shafts 5 are the same, and the ratio of the outer diameter of the inner cylinder 1 to the diameter of the small stirring shaft 5 is 2-9;

[0041] The ratio of the circumferential number of rows of inner cylinder stirring blades 11 on the inner cylinder 1 to the circumferential number of rows of stirring shaft blades 14 on the small stirring shaft 5 is defined as a "differential ratio", which is a non-integer, and the speed ratio of the inner cylinder 1 and the small stirring shaft 5 is equal to the differential ratio.

[0042] In some embodiments, Figure 2 As shown, preferably, the number of rows of the inner cylinder stirring blades 11 on the inner cylinder 1 is fifteen, the number of rows of the stirring shaft blades 14 on the small stirring shaft 5 is four, and the differential ratio is equal to 3.75.

[0043] In some embodiments, Figure 4 As shown, the angle α between the line connecting the axis of the small stirring shaft 5 and the axis of the inner cylinder 1 and the vertical plane is 50° to 70°, and is preferably 60° in this embodiment.

[0044] In some embodiments, Figure 2 , Figure 3 , Figure 4 As shown, the inner cylinder stirring blades 11 on the inner cylinder 1 are arranged spirally from the lower end to the higher end; the axial angle between the inner cylinder stirring blades 11 and the inner cylinder 1 is 10° to 45°;

[0045] The stirring shaft blades 14 on the small stirring shaft 5 are arranged in a spiral direction from the lower end to the higher end; the axial angle of the stirring shaft blades 14 is between 20° and 45°.

[0046] In some embodiments, Figure 2 , Figure 3 , Figure 4 As shown, the stirring shaft blades 14 and the inner cylinder stirring blades 11 are axially staggered, and the stirring shaft blades 14 are arranged in the middle of the two corresponding rows of the inner cylinder stirring blades 11. The area formed by the inner cylinder 1 and the small stirring shaft 5 is the "differential forced stirring area", as shown in FIG. Figure 1 As shown, the axial length m of the first region 13-2 is 1 / 2 to 2 / 3 of the axial length M of the annular region 13-1, and the high end of the first region 13-2 is flush with the high end of the annular region 13-1, and the low end of the first region 13-2 is located in the middle of the outer tube.

[0047] In some embodiments, the angle between the central axis of the inner cylinder 1 and the horizontal plane is 4° to 9°, preferably 5°.

[0048] In some embodiments, Figure 1 As shown, there are multiple feed inlets, which include a RAP material inlet 6, an asphalt inlet 7, and a powder material inlet 8 from the low end to the high end.

[0049] In some embodiments, Figure 1 , Figure 3 As shown, the differential twin-shaft asphalt mixing drum also includes a roller 3. The two ends of the inner cylinder 1 are respectively provided with rollers 3 in the areas exposed outside the outer cylinder. The small mixing shaft 5 is respectively provided with rollers 3 in the areas exposed outside the outer cylinder. The inner cylinder 1 and the small mixing shaft 5 are rotated relative to the outer cylinder by the rotation of the rollers.

[0050] In this embodiment, in an interlayer space formed between the inner cylinder and the outer cylinder, the inner cylinder 1 is used for heating and drying aggregates, and the interlayer 13 is used for heating and drying RAP materials and mixing mixed materials. The outer side of the interlayer 13 is provided with a RAP material inlet 6, an asphalt inlet 7, a powder inlet 8 and a finished material outlet 4, and both ends of the inner cylinder 1 are provided with an aggregate inlet 2 and a burner (not shown in the figure).

[0051] In some specific embodiments, the outer cylinder 9 is fixedly mounted on a bracket (not shown in the figure), the inner cylinder 1 and the small stirring shaft 5 are driven by a driving motor to drive the roller 3 to move, the small stirring shaft 5 is driven by the first driving device to move together, and the inner cylinder 1 is driven by the second driving device alone. The drum is placed at an angle of 5°, the burner is located at the lower end of the inner cylinder 1, and the aggregate inlet 2 is located at the upper end of the inner cylinder 1. The drying and heating blades can form a material curtain of aggregate in the inner cylinder, which promotes the drying of aggregate, and the stirring blades can make the mixture roll in the interlayer, which promotes the uniform mixing of various materials. The plane passing through the center line of the inner cylinder has an inclination angle with the horizontal plane, and the value of the inclination angle is between 4° and 9°. The inner cylinder 1 constitutes the large stirring shaft of the "differential double-horizontal shaft stirring drum".

[0052] In addition, the small stirring shaft 5 is hollow or solid and is placed on one side of the inner drum, with stirring blades thereon. The angle α between the axis of the two stirring shafts and the axis of the drum and the vertical plane is between 50° and 70°, in order to better stir the materials evenly. The small stirring shaft 5 constitutes the small stirring shaft of the "differential double-horizontal shaft stirring drum".

[0053] In order to avoid interference, the stirring shaft blades 14 on the small stirring shaft and the inner cylinder stirring blades 11 are arranged staggered with each other, and the area formed between the large stirring shafts is the "differential forced stirring area".

[0054] like Figure 2 , Figure 3 , Figure 4 As shown, drying and heating blades are provided on the inner wall of the inner cylinder 1, which continuously lift and scatter the aggregates, so as to promote the hot air to fully contact with the aggregates, improve the thermal efficiency, and heat the aggregates to the required temperature; the inner cylinder stirring blades 11 in the interlayer annular area 13-1 mainly play the role of heating the RAP material and pre-mixing the mixture, and the stirring shaft blades 14 in the first interlayer area 13-2 play the role of forced stirring of the mixture, and the mixture is mixed evenly by continuously rolling the mixture.

[0055] Stirring shaft blades 14 are arranged on the small stirring shaft 5, and are placed in proportion to the inner cylinder stirring blades 11 on the inner cylinder 1. In the preferred embodiment, the differential ratio is selected to be equal to 3.75, the stirring shaft blades 14 are arranged in 4 rows, the inner cylinder stirring blades 11 are arranged in 15 rows, and the stirring shaft blades 14 are arranged in the middle position of the corresponding two rows of inner cylinder stirring blades 11 without interference.

[0056] The working principle of the differential twin-shaft asphalt mixing drum of this embodiment is as follows:

[0057] Cold aggregate is added into the inner cylinder 1 from the aggregate inlet 2. The cold aggregate moves toward the aggregate discharge port 10 in sequence under the action of the rotation of the inner cylinder 1, the lifting and scattering of the drying and heating blades, and the tilting of the drum. In this process, the burner (not shown) heats and dries it. When the aggregate enters the interlayer 13, it is first stirred with the RAP material in the interlayer annular area 13-1 under the action of the inner cylinder stirring blades 11. After the RAP material is heated to a certain temperature, asphalt and powder are added into the interlayer annular area 13-1 through the asphalt inlet 7 and the powder inlet 8, and they are pre-stirred. Under the action of the inner cylinder stirring blades 11 and the inner cylinder 1, the mixture is transported to the first interlayer area 13-2. The mixture is forcibly stirred in the differential area between the inner cylinder 1 and the small stirring shaft 5, and finally output and stored through the finished material outlet 4 under the action of the discharge blades 12.

[0058] Example 2

[0059] On the other hand, a road maintenance device is also provided, comprising the differential twin-horizontal shaft asphalt mixture mixing drum.

[0060] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 protection content of the present invention.

[0061] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A differential twin-shaft asphalt mixing drum, characterized in that: It comprises a small stirring shaft (5) and an inner cylinder (1) and an outer cylinder (9) which are rotatable relative to each other; The outer cylinder (9) is sleeved outside the inner cylinder (1) and forms an interlayer (13) space with the outer wall of the inner cylinder (1); the interlayer (13) comprises an annular region (13-1) and a first region (13-2) for arranging a small stirring shaft (5); the central axis of the inner cylinder (1) is arranged obliquely so that the two ends of the inner cylinder and the outer cylinder form a high end and a low end; the small stirring shaft (5) is arranged in the first region (13-2) of the interlayer (13) between the inner cylinder (1) and the outer cylinder (9) and is located on one side of the inner cylinder (1); the small stirring shaft (5) is parallel to the central axis of the inner cylinder; a spiral The inner cylinder (1) has a mixing shaft blade (14) arranged in a spiral pattern; the upper end of the inner cylinder (1) is an open aggregate inlet (2); the lower end of the inner cylinder (1) is provided with an aggregate discharge port (10) that passes through the inner and outer interlayer spaces of the inner cylinder; the inner wall of the inner cylinder (1) is provided with drying and heating blades; the outer wall of the inner cylinder (1) is provided with inner cylinder mixing blades (11) arranged in a spiral pattern; the outer cylinder (9) is provided with a feed port and a finished material outlet (4) that pass through the interlayer space; the feed port is located above the other side of the inner cylinder (1) and close to the lower end of the outer cylinder (9); the finished material outlet (4) is located at the upper end of the outer cylinder (9) and close to the small The inner cylinder (1) is provided with a discharge blade (12) at a position corresponding to the finished product outlet (4); the rotation direction of the small stirring shaft (5) is opposite to the rotation direction of the inner cylinder (1); the ratio of the outer diameter of the inner cylinder (1) to the diameter of the small stirring shaft (5) is 2 to 9; the ratio of the circumferential number of inner cylinder stirring blades (11) on the inner cylinder (1) to the circumferential number of stirring shaft blades (14) on the small stirring shaft (5) is defined as a "differential ratio", the differential ratio is a non-integer, and the rotation speed ratio of the inner cylinder (1) and the small stirring shaft (5) is equal to the differential ratio; the inner cylinder stirring blades (11) on the inner cylinder (1) are arranged on the outer wall of the inner cylinder (1) and the inner cylinder stirring blades (14) on the small stirring shaft (5) are arranged on the outer wall of the inner cylinder (1) and the inner cylinder stirring blades (11) are arranged on the outer wall of the inner cylinder (1) and the inner cylinder stirring blades (14) are arranged on the inner cylinder (1) and the inner cylinder stirring blades (14) are arranged on the inner cylinder (1) and the inner cylinder stirring blades (11) are arranged on ...1) are arranged on the inner cylinder (1) and the inner cylinder stirring blades (11) are arranged on the inner cylinder (1) and the inner cylinder stirring blades (14) are arranged on the inner cylinder (1) and the inner cylinder stirring blades (14) are arranged on the inner cylinder (1) and the inner cylinder stirring blades (11) are arranged on the inner cylinder (1) and the inner The number of circumferential rows of the inner cylinder (11) is fifteen, the number of circumferential rows of the stirring shaft blades (14) on the small stirring shaft (5) is four, and the differential ratio is equal to 3.75; the stirring shaft blades (14) and the inner cylinder stirring blades (11) are arranged axially staggered, and the stirring shaft blades (14) are arranged in the middle position of the corresponding two rows of the inner cylinder stirring blades (11); the area formed by the inner cylinder (1) and the small stirring shaft (5) is a "differential forced stirring area", the axial length of the first area (13-2) is 1 / 2 to 2 / 3 of the axial length of the annular area (13-1), and the high end of the first area (13-2) is flush with the high end of the annular area (13-1); The inner cylinder stirring blades (11) on the inner cylinder (1) are arranged in a spiral direction from the lower end to the upper end; the axial angle between the inner cylinder stirring blades (11) and the inner cylinder (1) is between 10° and 45°; the stirring shaft blades (14) on the small stirring shaft (5) are arranged in a spiral direction from the lower end to the upper end; the axial angle between the stirring shaft blades (14) is between 20° and 45°.

2. The differential twin-shaft asphalt mixing drum according to claim 1, characterized in that: The angle α between the line connecting the axis of the small stirring shaft (5) and the axis of the inner cylinder (1) and the vertical plane is between 50° and 70°.

3. The differential twin-shaft asphalt mixing drum according to claim 1, characterized in that: The angle between the central axis of the inner cylinder (1) and the horizontal plane is 4° to 9°.

4. The differential twin-shaft asphalt mixing drum according to claim 1, characterized in that: There are multiple feed inlets, including a RAP material inlet (6), an asphalt inlet (7), and a powder material inlet (8).

5. The differential twin-shaft asphalt mixing drum according to claim 1, characterized in that: It also includes a rolling ring (3), wherein the areas at both ends of the inner cylinder (1) exposed outside the outer cylinder are respectively provided with a rolling ring (3), and the areas at the small stirring shaft (5) exposed outside the outer cylinder are respectively provided with a rolling ring (3), and the inner cylinder and the small stirring shaft (5) are rotated relative to the outer cylinder by the rotation of the rolling rings.

6. A road maintenance equipment, characterized in that: It comprises the differential twin-horizontal-shaft asphalt mixing drum as described in any one of claims 1 to 5.

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