Paver for highway pavement layer construction

Abstract

The invention provides a paver for highway pavement layer construction, and relates to the technical field of road construction, the paver comprises a machine body and two main shafts, each main shaft is provided with a conveying part and a first shield, and the main shafts drive the conveying parts to synchronously rotate in a first rotation direction to convey materials to two ends of the machine body in a second direction so as to transversely and uniformly spread the materials. Meanwhile, the main shaft drives the first protective cover to alternately screw in and screw out the materials, when the first protective cover is gradually screwed in the materials, the driving part drives the first protective cover to rotate in the first rotating direction, and when the first protective cover is gradually screwed out of the materials, the driving part drives the first protective cover to rotate in the second rotating direction, so that the first protective cover is decelerated relative to the materials; materials carried when the first protective cover is screwed out are reduced, so that the circumferential carrying effect of the first protective cover on the materials is reduced, the phenomenon of uneven material distribution caused by enrichment of fine materials on the upper middle layer and concentration of coarse aggregates on the lower layer is reduced, and the risks of quality defects such as vertical segregation and looseness after a road surface is compacted are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of road construction, in particular to a paving machine for highway pavement layer construction. BACKGROUND

[0002] The paving machine is a key equipment in road construction, which is used to uniformly spread paving materials such as asphalt mixture on the roadbed and form the required pavement structure. The paving machine is equipped with a spiral distributor at the front end, which is used to transversely transport the concentrated materials along the width direction of the paving operation and make the materials uniformly distributed, so as to form a continuous and uniform-thickness material strip, laying a foundation for subsequent leveling and compaction. The existing spiral distributor usually includes a rotating shaft and a spiral blade, the rotating shaft is horizontally arranged along the width direction of the paving operation, and the spiral blade (or auger blade) with equal pitch or variable pitch is detachably assembled on the rotating shaft to form a continuous or segmented spiral conveying surface.

[0003] When the existing paving machine is working, the spiral blade of the spiral distributor will generate a circumferential rotating force on the materials, so that the upper layer of fine aggregate and asphalt mortar move circumferentially with the blade due to the wrapping effect, while the lower layer of coarse aggregate settles and gathers due to the gravity, thereby causing uneven distribution of materials, increasing the risk of vertical segregation, loose and other quality defects of the pavement after compaction.

[0004] The information disclosed in the background section of this application is only intended to deepen the understanding of the general background of the present application, and should not be regarded as acknowledging or implying in any form that this information constitutes prior art known to those skilled in the art. SUMMARY

[0005] Therefore, it is necessary to provide a paving machine for highway pavement layer construction in view of the problems existing in the current paving machine.

[0006] The above-mentioned purpose is achieved by the following technical scheme: The application discloses a paving machine for highway pavement layer construction, which comprises a machine body capable of moving along a first direction, two main shafts arranged at intervals along a second direction on the machine body, the second direction being perpendicular to the first direction, the axis of the main shaft being parallel to the second direction, and a spiral conveying part being arranged on the main shaft, a feeding unit being arranged on the machine body and used for providing materials between the two conveying parts, the main shaft driving the conveying parts to synchronously rotate in a first rotation direction so as to convey the materials to both ends of the machine body along the second direction, a first shield in the shape of a sector being arranged on the main shaft, the first shield being coaxial with the main shaft and capable of rotating in the first rotation direction or a second rotation direction, the first rotation direction and the second rotation direction being opposite to each other in the circumferential direction of the main shaft, the main shaft rotating in the first rotation direction and driving the first shield to alternately rotate into and out of the materials, and a driving part being arranged on the main shaft, the driving part driving the first shield to rotate in the first rotation direction when the first shield gradually rotates into the materials, and the driving part driving the first shield to rotate in the second rotation direction when the first shield gradually rotates out of the materials.

[0007] Further, the driving part comprises a second shield in the shape of a sector and a driving assembly arranged between the first shield and the second shield, the first shield and the second shield being arranged in sequence along the second direction, the second shield being coaxial with the main shaft and capable of rotating in the first rotation direction or the second rotation direction, the second shield rotating between a first position and a second position, the second rotation direction being from the first position to the second position, and the second shield having a tendency to be in the first position, and the driving assembly being used for driving the first shield and the second shield to rotate in opposite rotation directions; the main shaft rotates in the first rotation direction and drives the second shield to alternately rotate into and out of the materials, the force applied to the second shield by the materials gradually increases when the first shield and the second shield gradually rotate into the materials, so that the second shield rotates from the first position to the second position in the second rotation direction, and the driving assembly drives the first shield to rotate in the first rotation direction; the force applied to the second shield by the materials gradually decreases when the first shield and the second shield gradually rotate out of the materials, so that the second shield rotates to the first position in the first rotation direction, and the driving assembly drives the first shield to rotate in the second rotation direction.

[0008] Further, in the second direction, the size of the first shield is greater than the size of the second shield, and the surface roughness of the first shield is smaller than the surface roughness of the second shield.

[0009] Furthermore, the drive assembly includes a reduction gear set and an arc-shaped rack. The reduction gear set is disposed between the first shield and the second shield. Each of the first shield and the second shield has a rack at one end close to each other. The rack on the second shield meshes with the input end of the reduction gear set, and the rack on the first shield meshes with the output end of the reduction gear set, so that the first shield and the second shield rotate in opposite directions, and the first shield reduces the speed of the second shield.

[0010] Furthermore, the conveying unit includes a plurality of blades arranged sequentially along the second direction. The blades have a semi-circular helical structure. A mounting cover and an inner cover, both semi-cylindrical in shape and detachably connected to the main shaft, are coaxially arranged on the main shaft. The mounting cover and the inner cover are located on opposite sides of a first plane, which passes through the axis of the main shaft. The inner side of the blade is connected to the mounting cover so that the blade is detachably connected to the main shaft. The first protective cover and the second protective cover are slidably disposed on the inner cover so that the first protective cover and the second protective cover are detachably connected to the main shaft.

[0011] Furthermore, the inner cover forms two opposing sliding chambers in the circumferential direction of the main shaft, and the ends of the first cover and the second cover slide along the sliding chambers in a sealed manner and are always located within the sliding chambers.

[0012] Furthermore, the outer surface of the spindle is provided with a sliding groove along the second direction, and two sliding grooves are symmetrically arranged about the first plane. The inner surfaces of the inner cover and the mounting cover are both formed with sliding rods. The sliding rods are slidably connected to the sliding grooves and are provided with anti-detachment structures. Both ends of the spindle can be detachably connected with fixing members to limit the position of the sliding rods in the sliding grooves.

[0013] Furthermore, the slide groove has mounting slots at both ends that communicate with it, and the slide rod can enter the slide groove through the mounting slots.

[0014] Furthermore, two adjacent blades are respectively a first component and a second component, and the inner cover corresponding to the first component and the mounting cover corresponding to the second component are spaced apart and tend to move away from each other.

[0015] Furthermore, the blades located at the end of the main shaft and the adjacent blades have opposite rotation directions.

[0016] The present invention has at least the following beneficial effects: (1) The main shaft drives the conveying unit to rotate synchronously in the first direction to convey the material to both ends of the machine body in the second direction, so as to spread the material evenly in the lateral direction. At the same time, the main shaft drives the first guard to alternately rotate in and out of the material. When the first guard gradually rotates in the material, the drive unit drives the first guard to rotate in the first direction. When the first guard gradually rotates out the material, the drive unit drives the first guard to rotate in the second direction, so that the first guard decelerates relative to the material, reduces the material carried on the first guard when it rotates out, thereby reducing the circumferential carrying effect of the first guard on the material, reducing the uneven distribution of material with the enrichment of fine material in the middle and upper layers and the concentration of coarse aggregate in the lower layer, and reducing the risk of quality defects such as vertical segregation and looseness after road compaction.

[0017] (2) By setting the blades to be detachably connected to the main shaft, the first and second guards are detachably connected to the main shaft through the cooperation of the sliding rod and the sliding groove. After the paver has been used for a period of time, the blades can be removed from the main shaft, and the blades with large wear differences can be replaced. The first and second guards can be disassembled and reassembled accordingly, so that the wear of the blades in the axial direction of the main shaft tends to be consistent, reducing the probability of segregation in the width direction of the road surface.

[0018] (3) Since the mounting cover and the inner cover are both semi-cylindrical and located on both sides of the first plane, the mounting cover and the inner cover completely enclose the main shaft. Then, the first protective cover and the second protective cover are installed on the inner cover, making the surface of the main shaft relatively smooth, thereby improving the efficiency of material conveying to both ends of the machine body along the second direction. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a paver for highway pavement layer construction provided in an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the main shaft and conveyor section; Figure 3 for Figure 2 A schematic diagram of a partial structure; Figure 4 for Figure 3 Exploded view of the parts; Figure 5 for Figure 4 A magnified view of a section at point A in the middle; Figure 6 for Figure 4 A diagram from another perspective; Figure 7 for Figure 6 A magnified view of a section at point B in the middle; Figure 8 for Figure 2 Exploded view of the components of the first protective shield and the drive unit; Figure 9A schematic diagram of the main shaft; Figure 10 for Figure 9 A magnified view of a section at point C.

[0020] in: 100. Body; 101. Main shaft; 102. Blades; 201. First protective cover; 202. Second protective cover; 203. Reset component; 204. Reduction gear set; 205. Rack; 206. Mounting cover; 207. Inner cover; 208. Side cover; 301. Slide groove; 302. Slide rod; 303. Fixing component; 304. Mounting groove; 305. Compression spring. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0022] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] like Figures 1 to 10As shown, this embodiment of the invention provides a paver for highway pavement construction (hereinafter referred to as the paver), including a body 100 capable of moving along a first direction. Two main shafts 101 are spaced apart on the body 100 along a second direction, perpendicular to the first direction. The axes of the main shafts 101 are parallel to the second direction, and each main shaft 101 has a spiral conveying section. A feeding unit is provided on the body 100 to supply material between the two conveying sections. The main shafts 101 drive the conveying sections to rotate synchronously in the first direction, thereby conveying material to both ends of the body 100 along the second direction. The main shaft 101 is provided with a fan-shaped first protective cover 201. The first protective cover 201 is coaxial with the main shaft 101 and can rotate in a first rotation direction or a second rotation direction. The first rotation direction and the second rotation direction are both circumferential directions of the main shaft 101 and are opposite in direction. When the main shaft 101 rotates in the first rotation direction, it drives the first protective cover 201 to alternately rotate in and out of the material. The main shaft 101 is provided with a drive unit. When the first protective cover 201 gradually rotates in the material, the drive unit drives the first protective cover 201 to rotate in the first rotation direction. When the first protective cover 201 gradually rotates out of the material, the drive unit drives the first protective cover 201 to rotate in the second rotation direction.

[0025] The main shaft 101 drives the conveying unit to rotate synchronously in a first direction to convey the material to both ends of the machine body 100 along a second direction, so as to spread the material evenly laterally. At the same time, the main shaft 101 drives the first guard 201 to alternately rotate in and out of the material. When the first guard 201 gradually rotates in the material, the drive unit drives the first guard 201 to rotate in the first direction. When the first guard 201 gradually rotates out the material, the drive unit drives the first guard 201 to rotate in the second direction. This causes the first guard 201 to decelerate relative to the material, reducing the material carried on the first guard 201 when it rotates out. This reduces the circumferential carrying effect of the first guard 201 on the material, reduces the uneven distribution of material with the enrichment of fine material in the middle and upper layers and the concentration of coarse aggregate in the lower layer, and reduces the risk of quality defects such as vertical segregation and looseness after road compaction.

[0026] The paver includes: a power unit that provides power to the entire machine via an engine and distributes power to other components via a transfer case; a walking unit, which can be tracked or tire-mounted to support the movement of the entire machine and can achieve uniform speed walking and synchronous steering through a closed hydraulic circuit; a material feeding unit that receives unloaded material through a hopper and supplies material between two conveying sections via a scraper conveyor; a auger spreader, which includes a main shaft 101 and a spiral conveying section that conveys material in a second direction to both ends of the machine body 100 when rotating; a screed unit that smooths the material with a main screed, pre-compacts loose material with a vibrating beam, and increases the paving density by heating the screed; and a control system that includes an automatic leveling system and an operating interface. The structure and working principle of the paver described above are existing technologies and will not be elaborated here.

[0027] The axes of both main shafts 101 are along the second direction. The first direction is the length direction of the road surface, i.e., the overall running direction of the paver, and the second direction is the width direction of the road surface. The highest surface of the paved material is lower than the highest point of the outer surface of the main shaft 101. Therefore, when the main shaft 101 rotates, it can drive the first protective cover 201 to alternately rotate in and out of the material.

[0028] In one embodiment, see Figures 3 to 8 The drive unit includes a fan-shaped second shield 202 and a drive assembly disposed between the first shield 201 and the second shield 202. The first shield 201 and the second shield 202 are arranged sequentially along a second direction. The second shield 202 is coaxial with the main shaft 101 and can rotate in a first rotation direction or a second rotation direction. The second shield 202 rotates between a first position and a second position, with the rotation direction from the first position to the second position being the second rotation direction. The second shield 202 tends to be in the first position. The drive assembly is used to make the first shield 201 and the second shield 202 rotate in opposite rotation directions. The main shaft 101 rotates in the first rotation direction. The material is alternately spun into and out of the second shield 202. When the material is gradually spun into the first shield 201 and the second shield 202, the force exerted by the material on the second shield 202 gradually increases, causing the second shield 202 to rotate from the first position to the second position in a second direction, and driving the first shield 201 to rotate in the first direction through the drive component. When the material is gradually spun out of the first shield 201 and the second shield 202, the force exerted by the material on the second shield 202 gradually decreases, causing the second shield 202 to rotate from the first position in the first direction, and driving the first shield 201 to rotate in the second direction through the drive component.

[0029] When the first shield 201 and the second shield 202 are gradually spun into the material, the material exerts a second rotational force on the second shield 202, causing the second shield 202 to rotate from the first position to the second position in the second rotational direction, and driving the first shield 201 to rotate in the first rotational direction through the drive assembly; when the first shield 201 and the second shield 202 are gradually spun out of the material, the second rotational force exerted by the material on the second shield 202 gradually decreases, and the second shield 202, due to its tendency to be in the first position, rotates from the first position to the first position in the first rotational direction, and driving the first shield 201 to rotate in the second rotational direction through the drive assembly.

[0030] When the first protective cover 201 and the second protective cover 202 gradually rotate into the material, the material exerts a second rotational force on both the first protective cover 201 and the second protective cover 202. At the same time, the second protective cover 202 exerts a first rotational force on the first protective cover 201 through the driving component. By setting the relevant parameters of the driving component, the first rotational force on the first protective cover 201 can be made greater than the second rotational force, thereby causing the first protective cover 201 to rotate in the first rotational direction.

[0031] The main shaft 101 is coaxially provided with a semi-cylindrical inner cover 207. A first cover 201 and a second cover 202 are both slidably disposed on the inner cover 207. A reset member 203, which can be a spring, is provided between the inner cover 207 and the second cover 202 to ensure the second cover 202 is in a first position. When the first cover 201 and the second cover 202 are gradually screwed into the material, the material exerts a second rotational force on the second cover 202, causing the second cover 202 to overcome the elastic force of the reset member 203 and rotate from the first position to the second position in the second rotational direction. When the first cover 201 and the second cover 202 are gradually screwed out of the material, the second rotational force exerted by the material on the second cover 202 gradually decreases, and the second cover 202, under the action of the reset member 203, rotates back to the first position in the first rotational direction to reset.

[0032] In one embodiment, in the second direction, the size of the first shield 201 is larger than the size of the second shield 202, and the surface roughness of the first shield 201 is smaller than the surface roughness of the second shield 202.

[0033] Compared to the second shield 202, in the second direction, the first shield 201, with its smaller surface roughness, is the main component in contact with the material. As it gradually rotates into the material, it experiences less force from the material, thus reducing the second rotational force exerted by the material on the first shield 201. This facilitates the second shield 202 generating a first rotational force on the first shield 201, thereby making it easier for the first shield 201 to rotate in the first rotational direction. Furthermore, the carrying effect of the first shield 201 on the material during rotation is also smaller, further reducing the circumferential carrying effect of the first shield 201 on the material.

[0034] In one embodiment, the drive assembly includes a reduction gear set 204 and an arc-shaped rack 205. The reduction gear set 204 is disposed between the first shield 201 and the second shield 202. The first shield 201 and the second shield 202 are each provided with a rack 205 at their respective ends that are close to each other. The rack 205 on the second shield 202 meshes with the input end of the reduction gear set 204, and the rack 205 on the first shield 201 meshes with the output end of the reduction gear set 204, so that the first shield 201 and the second shield 202 rotate in opposite directions, and the first shield 201 reduces the speed of the second shield 202.

[0035] Specifically, by setting relevant gear parameters of the reduction gear set 204, such as the number of gears, meshing ratio, and pitch circle diameter, the force exerted on the first protective cover 201 in the first direction of rotation can be made greater than the force exerted on it in the second direction of rotation, thereby causing the first protective cover 201 to rotate in the first direction of rotation. The input end of the reduction gear set 204 is the high-speed side, and the output end is the low-speed side, so the first protective cover 201 provides speed reduction transmission to the second protective cover 202. Preferably, the reduction gear set 204 may include a first large gear and a first small gear fixed coaxially, and a second large gear and a second small gear fixed coaxially, and all of the above gears are rotatably mounted on the inner cover 207. The rack 205 on the second cover 202 meshes with the first large gear. When the rack 205 on the second cover 202 rotates circumferentially along the main shaft 101, it drives the first large gear and the first small gear to rotate. The first small gear meshes with the second large gear to drive the second large gear and the second small gear to rotate, thereby driving the rack 205 on the first cover 201 to rotate in the opposite direction circumferentially along the main shaft 101.

[0036] The rack 205 is arc-shaped and coaxially arranged with the main shaft 101. The engagement of the reduction gear set 204 and the rack 205 enables the first guard 201 to reduce the speed of the second guard 202. At the same time, in the circumferential direction of the main shaft 101, the distance that the second guard 202 moves is greater than the distance that the first guard 201 moves. For example, when the second guard 202 rotates 20° in the circumferential direction of the main shaft 101, the first guard 201 may only rotate 5° in the circumferential direction of the main shaft 101. Therefore, in the circumferential direction of the main shaft 101, the size of the first guard 201 should be smaller than the size of the second guard 202, so that when materials are gradually screwed in or out, the first guard 201 can rotate a greater angle, thereby further reducing the carrying effect on the materials.

[0037] In one embodiment, the conveying unit includes a plurality of blades 102 arranged sequentially along a second direction. The blades 102 have a semi-circular helical structure. A mounting cover 206 and an inner cover 207, both semi-cylindrical in shape and detachably connected to the main shaft 101, are coaxially provided on the main shaft 101. The mounting cover 206 and the inner cover 207 are located on both sides of a first plane, which passes through the axis of the main shaft 101. The inner side of the blades 102 is connected to the mounting cover 206 so that the blades 102 are detachably connected to the main shaft 101. The first cover 201 and the second cover 202 are both slidably disposed on the inner cover 207 so that the first cover 201 and the second cover 202 are detachably connected to the main shaft 101.

[0038] After a period of use, existing pavers exhibit uneven wear on the blades 102 along the axial direction of the main shaft 101, with blades near the ends showing severe wear and those near the middle showing less wear. Continued use can lead to uneven material distribution and segregation in the width direction of the pavement. By detachably connecting the blades 102 to the main shaft 101, and the first and second guards 201 to the main shaft 101, the blades 102 can be removed from the main shaft 101 after a period of use. Blades with significantly different wear levels can be replaced, and the first and second guards 201 can be reassembled accordingly. This ensures that the wear on the blades 102 along the axial direction of the main shaft 101 is more uniform, reducing the probability of segregation in the width direction of the pavement.

[0039] The blades 102 at the end of the main shaft 101 and their adjacent blades 102 have opposite rotation directions. After a period of use, blades 102 with significantly different degrees of wear can be replaced using the following methods: Figure 1 In this process, the main shaft 101 on the left and the conveying unit together are referred to as the first assembly, and the main shaft 101 on the right and the conveying unit together are referred to as the second assembly. First, remove the blades 102 from both ends of the main shaft 101 in the first assembly and the main shaft 101 in the second assembly. Then, install the two blades 102 removed from the main shaft 101 in the first assembly on the left end of the main shaft 101 in the second assembly. At this time, the blades 102 on the main shaft 101 in the second assembly are all facing the same direction. Next, remove the two blades 102 from the right end of the main shaft 101 in the second assembly and install them at both ends of the main shaft 101 in the first assembly. Then, install the two blades 102 removed from the main shaft 101 in the second assembly on the right end of the main shaft 101 in the first assembly. At this time, the blades 102 on the main shaft 101 in the first assembly are all facing the same direction. Finally, remove the two blades 102 from the left end of the main shaft 101 in the first assembly and install them at both ends of the main shaft 101 in the second assembly, thereby completing the replacement of the blades 102. Of course, other blade 102 disassembly and assembly steps can also be used, and there are no restrictions here.

[0040] The existing auger spreader of the paver forms many seams and stepped surfaces on the surface of the main shaft 101, which easily causes material to stagnate near the main shaft 101, affecting the material conveying to both ends of the machine body 100 along the second direction. Since the mounting cover 206 and the inner cover 207 are both semi-cylindrical and located on both sides of the first plane, the mounting cover 206 and the inner cover 207 completely enclose the main shaft 101. Then, the first protective cover 201 and the second protective cover 202 are installed on the inner cover 207, making the surface of the main shaft 101 relatively smooth, thereby improving the efficiency of material conveying to both ends of the machine body 100 along the second direction.

[0041] All blades 102 are semi-circular spiral structures, meaning their starting and ending ends form a 180° angle around the main shaft 101. Adjacent blades 102 in the same direction are connected end-to-end to form a continuous spiral conveying structure. Both the mounting cover 206 and the inner cover 207 are semi-cylindrical, with corresponding central angles of 180°.

[0042] In one embodiment, the inner cover 207 has two opposing sliding chambers formed in the circumferential direction of the main shaft 101. The ends of the first cover 201 and the second cover 202 slide along the sliding chambers in a sealed manner and are always located inside the sliding chambers to prevent the ends of the first cover 201 and the second cover 202 from sliding out of the sliding chambers, which would cause material to enter the inner cover 207 and interfere with the operation of the drive unit.

[0043] The inner cover 207 is fixed with a side cover 208, and a sliding chamber is formed between the two along the main shaft 101. The inner sides of the first cover 201 and the second cover 202 are slidably sealed with the inner cover 207, and the outer sides are slidably sealed with the side cover 208.

[0044] In one embodiment, see Figure 9 and Figure 10 The outer surface of the main shaft 101 is provided with a sliding groove 301 along the second direction. Two sliding grooves 301 are symmetrically arranged about the first plane. The inner surfaces of the inner cover 207 and the mounting cover 206 are both formed with sliding rods 302. The sliding rods 302 are slidably connected to the sliding grooves 301 and are provided with an anti-detachment structure. Both ends of the main shaft 101 can be detachably connected with fixing parts 303 to limit the position of the sliding rods 302 in the sliding grooves 301.

[0045] The sliding rod 302 and the sliding groove 301 slide together, which improves the efficiency and ease of operation of disassembling and assembling the inner cover 207 and the mounting cover 206, thereby facilitating the replacement of the blade 102.

[0046] The anti-detachment structure consists of a T-shaped or dovetail-shaped cross-section for the slide groove 301 and the slide rod 302, to prevent the slide rod 302 from detaching from the slide groove 301 and causing connection failure. The fixing member 303 is a ring that can be fitted onto the spindle 101, and the fixing member 303 has a through hole, while the spindle 101 has a corresponding threaded hole, so that the fixing member 303 can be fixed to the spindle 101 by bolts or other fasteners.

[0047] In one embodiment, the slide groove 301 has mounting grooves 304 at both ends that communicate with it, and the slide rod 302 can enter the slide groove 301 through the mounting grooves 304.

[0048] When installing the blade 102, the first protective cover 201, and the second protective cover 202, the corresponding sliding rod 302 is inserted from the mounting groove 304 into the sliding groove 301. The sliding rod 302 can then only slide along the sliding groove 301, and its position within the sliding groove 301 is further restricted by the fixing member 303. Conversely, when disassembling the blade 102, the first protective cover 201, and the second protective cover 202, the corresponding sliding rod 302 is simply slid to the mounting groove 304 and removed. This further improves the efficiency and ease of operation of disassembling and assembling the inner cover 207 and the mounting cover 206, facilitating the replacement of the blade 102.

[0049] Of course, the slide groove 301 can also be extended from one end of the main shaft 101 to the other end. In this case, there is no need to open the mounting groove 304. The slide rod 302 can be slid out or into the slide groove 301 to realize the disassembly and assembly process of the inner cover 207 and the mounting cover 206.

[0050] In one embodiment, two adjacent blades 102 are respectively a first component and a second component, and the inner cover 207 corresponding to the first component and the mounting cover 206 corresponding to the second component are spaced apart and tend to move away from each other.

[0051] During the process of conveying material along the second direction to both ends of the machine body 100, for a main shaft 101, material tends to accumulate at both ends, resulting in greater axial pressure on the blades 102 at both ends of the main shaft 101. The inner cover 207 of the first component and the mounting cover 206 of the second component are spaced apart and a compression spring 305 is provided between them, so that adjacent blades 102 tend to move away from each other, thereby easing the axial pressure on the blades 102.

[0052] In one embodiment, the blade 102 located at the end of the main shaft 101 and the adjacent blade 102 have opposite rotation directions.

[0053] For a main shaft 101, material tends to accumulate at both ends. The blades 102 in most of the middle of the main shaft 101 rotate in the same direction, while the blades 102 at both ends are set in opposite directions to push the accumulated material in the opposite direction, that is, to push the accumulated material towards the middle of the machine body 100 to prevent accumulation.

[0054] When in use, the paver body 100 moves along a first direction, while the main shaft 101 drives the central unidirectional blades 102 to rotate synchronously in a first direction, so as to convey the material to both ends of the body 100 along a second direction, so as to spread the material evenly laterally. At the same time, the reverse blades 102 at the end of the main shaft 101 also rotate synchronously in the first direction, pushing the material accumulated at the end of the main shaft 101 in the reverse direction, that is, pushing the accumulated material towards the middle of the body 100 to prevent accumulation. Simultaneously, the main shaft 101 drives the first guard 201 and the second guard 202 to rotate in or out of the material. When the first guard 201 and the second guard 202 gradually rotate in the material, the material exerts a second rotational force on the second guard 202, causing the second guard 202 to rotate from the first position to the second position in the second rotational direction. The second guard 202 drives the first guard 201 to rotate in the first rotational direction through the cooperation of the rack 205 and the reduction gear set 204. When the first guard 201 and the second guard 202 gradually rotate out of the material, the material exerts a second rotational force on the second guard 202. As the load gradually decreases, the second guard 202 rotates towards the first position in the first direction under the action of the reset member 203. The second guard 202 drives the first guard 201 to rotate in the second direction through the cooperation of the rack 205 and the reduction gear set 204. This causes the first guard 201 to decelerate relative to the material, reducing the material carried on the first guard 201 when it rotates out. This reduces the circumferential carrying effect of the first guard 201 on the material, reduces the uneven distribution of material with the enrichment of fine material in the middle and upper layers and the concentration of coarse aggregate in the lower layer, and reduces the risk of quality defects such as vertical segregation and loosening after road compaction.

[0055] By setting the blade 102 to be detachably connected to the main shaft 101, and the first guard 201 and the second guard 202 to be detachably connected to the main shaft 101 through the cooperation of the slide rod 302 and the slide groove 301, after the paver has been used for a period of time, the blade 102 can be removed from the main shaft 101, and the blades 102 with large differences in wear can be replaced. The first guard 201 and the second guard 202 can be disassembled and assembled accordingly, so that the wear degree of the blade 102 in the axial direction of the main shaft 101 tends to be consistent, reducing the probability of segregation in the width direction of the road surface.

[0056] Meanwhile, since both the mounting cover 206 and the inner cover 207 are semi-cylindrical and located on both sides of the first plane, the mounting cover 206 and the inner cover 207 completely enclose the main shaft 101. Then, the first protective cover 201 and the second protective cover 202 are installed on the inner cover 207, making the surface of the main shaft 101 relatively smooth, thereby improving the efficiency of material conveying to both ends of the machine body 100 along the second direction.

[0057] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A paver for highway pavement layer construction, characterized in that, The device includes a body capable of moving along a first direction, two main shafts spaced apart along a second direction perpendicular to the first direction, the axis of each main shaft parallel to the second direction and a spiral conveying section on each main shaft, a feeding unit on the body for supplying material between the two conveying sections, and the main shafts driving the conveying sections to rotate synchronously in the first direction to convey material to both ends of the body along the second direction. The main shaft is provided with a first fan-shaped protective cover. The first protective cover is coaxial with the main shaft and can rotate in either a first or a second direction. The first and second directions are both circumferential directions of the main shaft and are opposite in direction. When the main shaft rotates in the first direction, it drives the first protective cover to alternately rotate in and out of the material. The main shaft is provided with a drive unit. When the first protective cover gradually rotates in the material, the drive unit drives the first protective cover to rotate in the first direction. When the first protective cover gradually rotates out of the material, the drive unit drives the first protective cover to rotate in the second direction.

2. The paver for highway pavement layer construction according to claim 1, characterized in that, The drive unit includes a fan-shaped second shield and a drive assembly disposed between the first shield and the second shield. The first shield and the second shield are arranged sequentially along the second direction. The second shield is coaxial with the main shaft and can rotate in the first rotation direction or the second rotation direction. The second shield rotates between a first position and a second position. The rotation direction is from the first position to the second position, and the second shield tends to be in the first position. The drive assembly is used to make the first shield and the second shield rotate in opposite rotation directions. The main shaft rotates in the first direction of rotation, causing the second shield to alternately rotate in and out of material. When the first shield and the second shield gradually rotate in material, the force exerted by the material on the second shield gradually increases, causing the second shield to rotate from the first position to the second position in the second direction of rotation, and driving the first shield to rotate in the first direction of rotation through the drive assembly. When the first shield and the second shield gradually rotate out of material, the force exerted by the material on the second shield gradually decreases, causing the second shield to rotate from the first position in the first direction of rotation, and driving the first shield to rotate in the second direction of rotation through the drive assembly.

3. The paver for highway pavement layer construction according to claim 2, characterized in that, In the second direction, the size of the first shield is larger than the size of the second shield, and the surface roughness of the first shield is smaller than the surface roughness of the second shield.

4. The paver for highway pavement layer construction according to claim 2, characterized in that, The drive assembly includes a reduction gear set and an arc-shaped rack. The reduction gear set is disposed between the first shield and the second shield. Each of the first shield and the second shield has a rack at one end that is close to each other. The rack on the second shield meshes with the input end of the reduction gear set, and the rack on the first shield meshes with the output end of the reduction gear set, so that the first shield and the second shield rotate in opposite directions, and the first shield reduces the speed of the second shield.

5. The paver for highway pavement layer construction according to claim 2, characterized in that, The conveying unit includes a plurality of blades arranged sequentially along the second direction. The blades have a semi-circular helical structure. A mounting cover and an inner cover, both semi-cylindrical in shape and detachably connected to the main shaft, are coaxially arranged on the main shaft. The mounting cover and the inner cover are located on opposite sides of a first plane, which passes through the axis of the main shaft. The inner side of the blade is connected to the mounting cover so that the blade is detachably connected to the main shaft. The first protective cover and the second protective cover are slidably disposed on the inner cover so that the first protective cover and the second protective cover are detachably connected to the main shaft.

6. The paver for highway pavement layer construction according to claim 5, characterized in that, The inner cover forms two opposing sliding chambers in the circumferential direction of the main shaft. The ends of the first cover and the second cover slide along the sliding chambers in a sealed manner and are always located within the sliding chambers.

7. The paver for highway pavement layer construction according to claim 5, characterized in that, The outer surface of the spindle is provided with a sliding groove along the second direction. Two sliding grooves are symmetrically arranged about the first plane. The inner surfaces of the inner cover and the mounting cover are both formed with sliding rods. The sliding rods are slidably connected to the sliding grooves and are provided with anti-detachment structures. Both ends of the spindle can be detachably connected with fixing members to limit the position of the sliding rods in the sliding grooves.

8. The paver for highway pavement layer construction according to claim 7, characterized in that, The slide groove has mounting slots at both ends that communicate with it, and the slide rod can enter the slide groove through the mounting slots.

9. The paver for highway pavement layer construction according to claim 5, characterized in that, The two adjacent blades are respectively the first component and the second component. The inner cover corresponding to the first component and the mounting cover corresponding to the second component are spaced apart and tend to move away from each other.

10. The paver for highway pavement layer construction according to claim 5, characterized in that, The blades located at the end of the main shaft and the adjacent blades have opposite rotation directions.

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