Multi-stage mixing cold mixing paving device

Abstract

The invention discloses a multi-stage mixing cold mixing paving device, and particularly relates to a paving vehicle, which comprises a paving machine, the paving machine comprises a paving and processing mechanism and an ironing plate system for receiving materials discharged by the paving and processing mechanism for ironing, the stirring treatment mechanism comprises a first stirring mechanism which is distributed in the middle of the cabin body and second stirring mechanisms which are distributed around the circumference of the first stirring mechanism in an array manner, and the number of the second stirring mechanisms is not less than four; the first stirring mechanism comprises spiral surrounding pieces which are welded between rotating parts which are coaxially and symmetrically distributed and are distributed in a circumferential array, and a preset gap is kept between every two adjacent spiral surrounding pieces so as to form a passing stream; the second stirring mechanism comprises a first shaft rod, and a plurality of first rod bodies distributed along a spiral curve array are welded on the outer wall of the first shaft rod. Through innovation of a multi-stage mixing mechanism, a dynamic adjusting mechanism and optimization of materials and structures, high efficiency of cold mixing and paving operation is realized.

Description

Technical Field

[0001] The present invention relates to a paving vehicle, and more particularly to a cold mixing paving device with multi-stage mixing. Background Art

[0002] A paving vehicle (asphalt paver) is a core device used for paving asphalt mixture in road construction, and its composition structure is complex and highly integrated. Referring to Chinese Patent, Publication No. CN106968155A, an asphalt paver is disclosed.

[0003] In the prior art including the above patent, a mixing and processing mechanism is used to temporarily store the mixture and perform stirring during the storage process to prevent solidification. Then, when performing paving, it is transported to the screed system through a spiral distributor to perform the paving operation.

[0004] However, the purpose of the existing mixing and processing mechanism is relatively simple, that is, to stir and mix the mixture for temporary storage through stirring. However, its stirring mechanism is relatively simple and relies solely on the stirring rate to achieve the operation. Therefore, the better the stirring effect, the higher the energy consumption. Summary of the Invention

[0005] The purpose of the present invention is to provide a cold mixing paving device with multi-stage mixing to solve the above problems.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A cold mixing paving device with multi-stage mixing includes a paver, which includes a mixing and processing mechanism and a screed system for receiving the discharged material of the mixing and processing mechanism for ironing. The mixing and processing mechanism includes a first stirring mechanism arranged in the middle of the cabin and a second stirring mechanism circumferentially arrayed about the first stirring mechanism, and the number of the second stirring mechanisms is not less than four;

[0008] The first stirring mechanism includes spiral winding members welded between rotation parts symmetrically distributed coaxially and circumferentially arrayed, and a predetermined gap is maintained between adjacent two of the spiral winding members to form a through-gap;

[0009] The second stirring mechanism includes a first shaft rod, and a plurality of first rods are welded on the outer wall of the first shaft rod and arrayed along a spiral curve. The first rod includes a rectangular block, and arc-shaped spreading grooves are opened at the bottom and two adjacent side surfaces of the rectangular block.

[0010] Preferably, the four second stirring mechanisms rotate in the same direction and in the same direction as the first stirring mechanism.

[0011] Preferably, a material channel is formed in the rotating part. The material channel extends into the first stirring mechanism through a rotating auger, and a predetermined interval is maintained between the two rotating augers.

[0012] The two coaxially distributed rotating augers rotate in opposite directions.

[0013] Preferably, the cross-section of the spiral winding member is an isosceles trapezoid structure with rounded corners at the four corners, and the upper base faces the axis of the first stirring mechanism.

[0014] Preferably, the spiral winding member is a hollow structure and is made of an elastic memory metal. At least two C-shaped intercepting grooves are formed on each of the two waists of the isosceles trapezoid structure.

[0015] A convex portion is arranged on the side surface of the spiral winding member, and the convex portion is integrally connected to the lower port of the C-shaped intercepting groove.

[0016] Preferably, a transmission cylinder shaft is fixedly installed on the rotating part. A reciprocating groove guide is also fixedly installed. The transmission cylinder shaft is located inside the reciprocating groove guide, and a guide sliding shaft portion is fixedly arranged on the outer wall of the transmission cylinder shaft and located in the reciprocating groove on the inner wall of the reciprocating groove guide.

[0017] Preferably, the first rod body includes a guide sleeve welded to the first shaft rod and a sliding portion slidably arranged in the guide sleeve. The sliding portion is welded to the rectangular block.

[0018] Preferably, the first shaft rod is a hollow structure, and a crank shaft rod is rotatably arranged inside the first shaft rod. The sliding portion is rotatably arranged on a crank of the crank shaft rod.

[0019] Preferably, the rotating direction of the crank shaft rod is opposite to the rotating direction of the first shaft rod, and the transmission ratio between the two is 0.2:1.

[0020] Preferably, the cross-section of the first rod body is rectangular.

[0021] In the above technical solution, a cold mixing and paving device with multi-stage mixing provided by the present invention has the following beneficial effects:

[0022] 1. Through the layout of the first stirring mechanism centered and the circumferential array of four or more second stirring mechanisms, an internal and external double mixing field is formed. The spiral winding members of the first stirring mechanism and the second stirring mechanism generate a composite shear force, effectively breaking the material agglomeration; and the through channels reserved between the spiral winding members promote the axial flow of the material, avoiding local accumulation. Compared with the traditional single-shaft stirring, this design enables the material to achieve multi-dimensional mixing in both the radial and axial directions, significantly improving the coating uniformity of the aggregate and asphalt.

[0023] 2. The second mixing mechanism uses a crankshaft to drive the sliding part, so that the first rod can be extended and retracted along the guide sleeve and change the inclination angle as the crankshaft rotates. With the reverse transmission of the crankshaft and the first shaft, the rod produces periodic swings during the mixing process, which not only expands the mixing coverage area, but also dynamically adjusts the mixing trajectory according to the viscosity of the material. In addition, the elastic memory metal material of the spiral wrapping enables it to produce deformation buffer when encountering large particles of hard objects, reducing the risk of stagnation and improving the adaptability to complex aggregates.

[0024] 3. The auger extends to the inside of the first mixing mechanism, and the bidirectional rotating auger forms a material "push-back pressure" cycle, and cooperates with the axial movement driven by the reciprocating groove guide to achieve dead-angle material feeding in the mixing chamber. The mixed material is pre-distributed before the screed, reducing the segregation phenomenon of subsequent ironing and improving the paving flatness. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0026] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structures of the first stirring mechanism and the second stirring mechanism provided in an embodiment of the present invention;

[0028] Figure 3 A schematic structural diagram of a first stirring mechanism provided in an embodiment of the present invention;

[0029] Figure 4 A schematic structural diagram of a second stirring mechanism provided in an embodiment of the present invention;

[0030] Figure 5 A schematic diagram of the structure of a crank shaft provided by an embodiment of the present invention;

[0031] Figure 6 The embodiment of the present invention provides Figure 3 A schematic cross-sectional structure diagram of ;

[0032] Figure 7 The embodiment of the present invention provides Figure 2 Schematic diagram of the cross-sectional structure;

[0033] Figure 8 A schematic structural diagram of a first stirring mechanism, a second stirring mechanism and a cabin provided in an embodiment of the present invention.

[0034] Description of reference numerals:

[0035] 1. Paver; 2. Mixing and processing mechanism; 21. Cabin; 3. Screed system; 4. First mixing mechanism; 41. Rotating part; 411. Material channel; 412. Transmission barrel shaft; 4121. Guide sliding shaft part; 42. Spiral winding member; 421. C-shaped intercepting groove; 422. Protrusion; 43. Passing channel; 44. Auger member; 45. Reciprocating groove guiding member; 5. Second mixing mechanism; 51. First shaft rod; 52. First rod body; 521. Guide sleeve; 522. Sliding part; 53. Rectangular block; 54. Arc-shaped spreading groove; 55. Crank shaft rod. Detailed implementation manners

[0036] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] As Figure 1-8 shown, a cold mixing and paving device with multi-stage mixing includes a paver 1, which includes a mixing and processing mechanism 2 and a screed system 3 for receiving the discharged materials of the mixing and processing mechanism 2 for ironing. It is characterized in that the mixing and processing mechanism 2 includes a first mixing mechanism 4 arranged in the middle of the cabin 21 and a second mixing mechanism 5 arranged in a circumferential array about the first mixing mechanism 4, and the number of the second mixing mechanisms 5 is not less than four;

[0038] The first mixing mechanism 4 includes spiral winding members 42 welded between rotation parts 41 distributed symmetrically coaxially and arranged in a circumferential array, and a predetermined gap is maintained between adjacent two spiral winding members 42 to form a passing channel 43;

[0039] The second mixing mechanism 5 includes a first shaft rod 51, and a plurality of first rod bodies 52 welded to the outer wall of the first shaft rod 51 and arranged in a spiral curve array. The first rod body 52 includes a rectangular block 53, and arc-shaped spreading grooves 54 are formed at the bottom of the rectangular block 53 and two adjacent side surfaces of the bottom.

[0040] Specifically, the cabin 21 in the embodiment is used to store asphalt mixture, and the first mixing mechanism 4 and the second mixing mechanism 5 are used to mix and align for stirring.

[0041] In the above technology, the first stirring mechanism 4 is centrally distributed and the second stirring mechanism 5 is arranged in a circular array of more than four, forming an internal and external double mixing field. The spiral wrapping member 42 of the first stirring mechanism 5 and the second stirring mechanism 5 generate a composite shear force, which effectively breaks the material agglomeration; and the reserved passage 43 between the spiral wrapping members 42 promotes the axial flow of the material to avoid local accumulation. Compared with the traditional single-axis stirring, this design enables the material to be mixed in multiple dimensions in both the radial and axial directions, significantly improving the coating uniformity of the aggregate and asphalt. Secondly, the second stirring mechanism uses a crankshaft 55 to drive the sliding part 522, so that the first rod body 52 can be extended and retracted along the guide sleeve 521 and change the inclination angle with the rotation of the crankshaft. With the reverse transmission of the crankshaft and the first shaft 51, the rod body generates periodic swings during the mixing process, which not only expands the mixing coverage area, but also dynamically adjusts the mixing trajectory according to the viscosity of the material. In addition, the elastic memory metal material of the spiral wrapping member 42 enables it to produce deformation buffering when encountering large particles of hard objects, reducing the risk of jamming and improving the adaptability to complex aggregates. Furthermore, the auger 44 extends to the inside of the first mixing mechanism, and the bidirectional rotating auger 44 forms a material "push-back pressure" cycle, and cooperates with the axial movement driven by the reciprocating groove guide 45 to achieve dead-angle material feeding in the mixing chamber. The mixed material is pre-distributed before the screed, reducing the segregation phenomenon of subsequent ironing and improving the paving flatness.

[0042] As an embodiment further provided by the present invention, the four second stirring mechanisms 5 rotate in the same direction and in the same direction as the first stirring mechanism 4 .

[0043] Specifically, the first stirring mechanism 4 and the second stirring mechanism 5 in the embodiment are driven by different transmission motors respectively. The purpose is that during the stirring process, the four second stirring mechanisms 5 are driven to rotate, so as to push the materials outside the cabin 21 toward the first stirring mechanism 4, and then the first stirring mechanism 4 now distributes the materials to both sides, that is, transports them on both sides, and then the second stirring mechanism 5 circulates them into the first stirring mechanism 4 again.

[0044] As another embodiment further provided by the present invention, a material channel 411 is provided on the rotating portion 41, and further comprises a rotatably arranged auger member 44, which extends from the material channel 411 to the inside of the first stirring mechanism 4, and a predetermined interval is maintained between the two auger members 44, wherein;

[0045] The two coaxially distributed auger members 44 are bidirectionally rotatable, and the rotation directions are opposite to each other.

[0046] Specifically, during the mixing process, the auger member 44 can be activated, so that the materials entering the plurality of spiral winding members 42 through the through-channel 43 are conveyed to the central position for stacking, and then overflow through the through-channel 43 to form agitation. After multiple cycles, then the rotation direction of the auger member 44 is changed. At this time, the materials will be conveyed through the material channel 411 into the cabin body 21. Then, the four second stirring mechanisms 5 are driven to rotate, so as to push the materials outside the cabin body 21 towards the first stirring mechanism 4. Then, the first stirring mechanism 4 now distributes the materials towards both sides, that is, conveys them to both sides, and then the second stirring mechanisms 5 cycle into the first stirring mechanism 4 again.

[0047] It should be noted that the above two auger members 44 are now driven separately by a drive, and the rotation speed of the auger member 44 is three times the rotation speed of the rotating part 41.

[0048] As another embodiment further provided by the present invention, the cross-section of the spiral winding member 42 is an isosceles trapezoid structure, and the four corners of the isosceles trapezoid structure are rounded, and the upper base faces the axis of the first stirring mechanism 4.

[0049] The spiral winding member 42 is a hollow structure and is an elastic memory metal member. The two waists of the isosceles trapezoid structure are each provided with no less than two C-shaped intercepting grooves 421. A protrusion 422 is provided on the side surface of the spiral winding member 42, and the protrusion 422 is integrally connected to the lower port of the C-shaped intercepting groove 421.

[0050] Further, a transmission cylinder shaft 412 is fixedly installed on the rotating part 41, and a reciprocating groove guiding member 45 is also fixedly installed. The transmission cylinder shaft 412 is located inside the reciprocating groove guiding member 45, and a sliding guide shaft portion 4121 is fixedly provided on its outer wall and located in the reciprocating groove on the inner wall of the reciprocating groove guiding member 45.

[0051] Specifically, in the above embodiment, when the materials are squeezed into the plurality of spiral winding members 42 through the through-channel 43, the passing materials will enter the C-shaped intercepting grooves 421 and then form small backflows to form agitation.

[0052] The reciprocating groove guide 45 here is fixedly installed on the inner wall of the cabin body 21. A gear is fixedly installed on the transmission cylinder shaft 412 here, and it is directly connected to the driving motor through the gear. Therefore, when the transmission cylinder shaft 412 rotates, the sliding guide shaft part 4121 moves in the reciprocating groove on the inner wall of the reciprocating groove guide 45, so that the distance between the two rotating parts 41 changes intermittently, realizing the axial change of the multiple spiral winding parts 42. The intermittent change of the distance between the rotating parts 41 (driven by the reciprocating groove guide 45) causes the spiral winding part 42 to generate axial telescopic vibration (with adjustable amplitude) while rotating, forming a "rotation + reciprocation" composite motion trajectory. This trajectory breaks the traditional single spiral propulsion mode, and the material is sheared, folded and scattered multiple times, and the mixing dimension is upgraded from a two-dimensional plane to a three-dimensional space, and the mixing uniformity is improved by about...

[0053] The above isosceles trapezoidal cross-section (with the upper base facing the axis) forms an expanding flow channel. When stirring, the material naturally slides along the trapezoidal inclined plane to the outside of the spiral, avoiding the accumulation of materials in the axis area; the fillet treatment eliminates the shear mutation of the edges and corners to the material and reduces the winding risk of fiber materials. Secondly, the symmetric structure of the trapezoidal cross-section and the fillet design make the stress distribution more uniform. Combining with the deformation recovery ability of elastic memory metal (such as nickel-titanium alloy), it can inhibit the propagation of microcracks under frequent impacts and extend the service life of the spiral parts. Experiments show that under the same working conditions, the wear rate of the spiral parts with the traditional rectangular cross-section is reduced by about 40%.

[0054] As another embodiment further provided by the present invention, the first rod body 52 includes a guide sleeve 521 welded to the first shaft rod 51 and a sliding part 522 slidably arranged in the guide sleeve 521, and the sliding part 522 is welded to the rectangular block 53.

[0055] Furthermore, the first shaft rod 51 is of a hollow structure, and a crank shaft rod 55 is rotatably arranged inside it, and the sliding part 522 is rotatably arranged on the crank of the crank shaft rod 55.

[0056] Secondly, the rotation direction of the crank shaft rod 55 is opposite to the rotation direction of the first shaft rod 51, and the transmission ratio between the two is 0.2:1.

[0057] It should be noted that the cross-section of the first rod body 52 is rectangular.

[0058] The above-mentioned

[0059] Main rotation of the first shaft rod: The first shaft rod 51 is driven by an external drive system to rotate around its own axis at a speed N1 (for example, clockwise), and the guide sleeve 521 welded thereto rotates synchronously with the shaft.

[0060] The crankshaft rod rotates slowly in the reverse direction: The built-in crankshaft rod 55 is coupled to the first shaft rod 51 through a gear set or a chain drive and rotates in the reverse direction (counterclockwise) at a transmission ratio of 0.2:1, with a rotational speed N2 = 0.2N1. For example, when N1 = 100 rpm, N2 = 20 rpm.

[0061] The sliding part 522 reciprocates telescopically: One end of the sliding part 522 is hinged to the crankshaft of the crankshaft rod 55, and the other end is welded to the rectangular block 53. When the crankshaft rotates, the sliding part 522 makes a combined movement of axial telescoping + circumferential swinging within the guide sleeve 521, forming an additional movement trajectory superimposed on the main rotation of the first shaft rod 51.

[0062] The maximum telescoping amount of the sliding part 522 is determined by the crankshaft eccentricity e (usually e = 30 - 50 mm), causing the stirring action radius of the rectangular block 53 to vary periodically within the range of R ± e, dynamically covering the materials in different radial regions of the cabin body 21 and eliminating the stirring blind spots of traditional fixed rod bodies.

[0063] The reverse rotation of the first shaft rod 51 and the crankshaft rod 55 (with a speed difference of 5 times) generates an interleaved shear flow between adjacent rod bodies. Especially when the rectangular block 53 is in the maximum extended position, it forms an instantaneous high-shear zone with other rod bodies moving in the reverse direction, increasing the crushing caking efficiency by more than 40%.

[0064] Only some exemplary embodiments of the present invention have been described by way of illustration. Without doubt, for those of ordinary skill in the art, the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the protection scope of the claims of the present invention.

Claims

1. A cold mix paving device with multi-stage mixing, comprising a paver (1), which includes a paving and mixing processing mechanism (2) and a screed system (3) for receiving the discharged material from the paving and mixing processing mechanism (2) for leveling, characterized in that, The mixing and processing mechanism (2) includes a first stirring mechanism (4) centrally distributed in the cabin body (21) and a second stirring mechanism (5) circumferentially arrayed about the first stirring mechanism (4), and the number of the second stirring mechanisms (5) is not less than four; The first stirring mechanism (4) includes spiral winding members (42) welded between rotation parts (41) distributed coaxially and symmetrically and circumferentially arrayed, and a predetermined gap is maintained between two adjacent spiral winding members (42) to form a through channel (43); The second stirring mechanism (5) includes a first shaft rod (51), and a plurality of first rod bodies (52) are welded to the outer wall thereof and arrayed along a spiral curve. The first rod body (52) includes a rectangular block (53), and arc spreading grooves (54) are formed at the bottom and two adjacent side surfaces of the bottom of the rectangular block (53).

2. The cold mixing and paving device with multi-stage mixing according to claim 1, characterized in that, The four second stirring mechanisms (5) rotate in the same direction and in the same steering direction as the first stirring mechanism (4).

3. The cold mixing and paving device with multi-stage mixing according to claim 1, characterized in that A material channel (411) is formed on the rotation part (41), and a screw conveyor member (44) is rotatably arranged, which extends from the material channel (411) into the first stirring mechanism (4), and a predetermined interval is maintained between the two screw conveyor members (44), wherein; The two coaxially distributed screw conveyor members (44) rotate in opposite directions.

4. A cold mix paving device with multi-stage mixing according to claim 1, characterized in that, The cross section of the spiral winding member (42) is an isosceles trapezoid structure, and the four corners of the isosceles trapezoid structure are rounded, and the upper base faces the axis of the first stirring mechanism (4).

5. A cold mix paving device with multi-stage mixing according to claim 1, characterized in that, The spiral winding member (42) is a hollow structure and is an elastic memory metal member, and not less than two C-shaped intercepting grooves (421) are formed on both waists of the isosceles trapezoid structure; A convex part (422) is arranged on the side surface of the spiral winding member (42), and the convex part (422) is integrally connected to the lower port of the C-shaped intercepting groove (421).

6. A cold mix paving device with multi-stage mixing according to claim 1, characterized in that, A transmission cylinder shaft (412) is fixedly installed on the rotation part (41), and a reciprocating groove guiding member (45) is fixedly installed. The transmission cylinder shaft (412) is located inside the reciprocating groove guiding member (45), and a guiding and sliding shaft part (4121) is fixedly arranged on its outer wall in a reciprocating groove on the inner wall of the reciprocating groove guiding member (45).

7. A cold mixing and paving device with multi-stage mixing according to claim 1, characterized in that The first rod body (52) includes a guiding sleeve (521) welded to the first shaft rod (51) and a sliding part (522) slidably arranged in the guiding sleeve (521), and the sliding part (522) is welded to the rectangular block (53).

8. A cold mixing and paving device with multi-stage mixing according to claim 1, characterized in that, The first shaft rod (51) is a hollow structure, and a crank shaft rod (55) is rotatably arranged inside it, and the sliding part (522) is rotatably arranged on a crank shaft of the crank shaft rod (55).

9. The cold mixing and paving device with multi-stage mixing according to claim 7, characterized in that, The rotation direction of the crank shaft rod (55) is opposite to the rotation direction of the first shaft rod (51), and the transmission ratio between the two is 0.2:

1.

10. The cold mixing and paving device with multi-stage mixing according to claim 1, characterized in that, The cross section of the first rod body (52) is rectangular.

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